Mujtaba Rashid
RAC CEP
2021-ME-172
Refrigeration and Air Conditioning
CEP
Submitted by
Mujtaba Rashid
2021-ME-172
Submitted To
Prof. Dr. Asad Naeem Shah
Mechanical Engineering Department, University of
Engineering and Technology, LAHORE
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Mujtaba Rashid
RAC CEP
2021-ME-172
Declaration Form
I, Mujtaba Rashid, hereby declare that I have carefully read and understood all the instructions provided
for this Complex Engineering Problem (CEP). I affirm that:
•
•
•
•
•
The work presented in this report is entirely my own.
The tasks have been completed with full adherence to the provided guidelines and academic ethics.
All references and sources used in this work have been appropriately cited.
I accept full responsibility for the content submitted in this report.
I understand that failing to follow the instructions or any form of academic misconduct may result
in the CEP being marked zero.
Name: Mujtaba Rashid
Registration Number: 2021-ME-172
Date: 4/5/2025
Submitted to: Prof. Dr. Asad Naeem Shah
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Mujtaba Rashid
RAC CEP
2021-ME-172
Contents
Abstract ......................................................................................................................................................... 4
1 Introduction ........................................................................................................................................... 4
1.1
Effect of Building orientation on cooling load in hot climatic conditions and comparison with
Pakistan for Past 20 years ..................................................................................................................... 4
1.2
Effect of construction materials on cooling load in hot climatic conditions and comparison with
Pakistan for Past 20 years ..................................................................................................................... 5
1.3
Effect of Roof insulation on cooling load in hot climatic conditions and comparison with
Pakistan for Past 20 years ..................................................................................................................... 7
1.4
Effect of wall and floor insulation on cooling load in hot climatic conditions and comparison
with Pakistan for Past 20 years ............................................................................................................. 8
1.5
Effect of wall-to-window ratio on cooling load in hot climatic conditions and comparison with
Pakistan for Past 20 years ..................................................................................................................... 9
1.6
Effect of window glazing on cooling load in hot climatic conditions and comparison with
Pakistan for Past 20 years ................................................................................................................... 11
1.7
Energy-Efficient Building Materials for Hot Climates ........................................................... 12
2 Methodology ....................................................................................................................................... 14
2.1
Passive Techniques.................................................................................................................. 16
3 Results and Discussion ........................................................................................................................ 17
3.1
Environmental Impact ............................................................................................................. 20
3.2
Sustainability Evaluation ........................................................................................................ 20
3.3
Cost and Payback Analysis on Materials ................................................................................ 21
3.4
Importance of Trees ................................................................................................................ 21
Plantation Can Save Energy, Cool, and Protect the Environment....................................................... 22
3.5
Justification with Literature .................................................................................................... 22
4 Conclusion........................................................................................................................................... 22
5 References ........................................................................................................................................... 23
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RAC CEP
2021-ME-172
Abstract
This research comprehensively analyzes the impact of building orientation, construction materials, roof
insulation, wall and floor insulation, window-to-wall ratio (WWR), and window glazing on cooling loads
in hot climates, particularly in Pakistan. The study quantifies the effectiveness of various passive design
strategies in reducing cooling energy demand. A substantial reduction in cooling loads was found for
optimized building orientations (e.g., southwest), specific construction materials (e.g., EPS insulation,
PCMs), and appropriate insulation measures. The analyses demonstrate that incorporating passive design
strategies can substantially reduce cooling energy consumption. A significant reduction in cooling loads (up
to 50%) was observed in optimized scenarios compared to baseline cases, which included uninsulated
buildings with inadequate orientation. The research highlights the importance of these passive strategies for
achieving sustainable building performance in hot climates like Pakistan, offering significant cost savings
and substantial reductions in CO2 emissions (often by 50% or more).
1 Introduction
1.1 Effect of Building orientation on cooling load in hot climatic conditions
and comparison with Pakistan for Past 20 years
Building orientation significantly influences the thermal performance and energy efficiency of structures,
especially in hot climates. Proper orientation can harness natural ventilation and daylight, reducing reliance
on mechanical cooling systems[1, 2]. In Pakistan, where high temperatures prevail for a substantial part of
the year, optimizing building orientation is crucial for energy conservation and occupant comfort.
Research indicates that building orientation affects solar heat gain, which in turn influences cooling loads.
Orientations that minimize direct solar exposure during peak hours can lead to substantial energy savings.
For instance, a study conducted in Karachi found that a north-facing orientation resulted in the lowest
cooling energy consumption, while a west-facing orientation led to the highest cooling load due to
prolonged afternoon sun exposure[3].In Lahore, experimental findings demonstrated that southwest
orientation offers optimal energy conservation by balancing heating and cooling requirements. The study
emphasized the importance of integrating solar passive applications in architectural and urban design for
thermal control[4].Similarly, in Islamabad, altering building orientation, along with architectural
modifications, significantly enhanced energy efficiency. The use of cavity walls and structural concrete
insulated panels, combined with optimal orientation, contributed to reduced energy demand[5].Further
studies have quantified the impact of building orientation on energy consumption. An energy simulation
study across diverse terrains in Pakistan revealed that optimizing building orientation alone could result in
average energy savings of 18%. When combined with improvements in window arrangements and
construction materials, savings could reach up to 30% over 30 years[6].
Table 1: Orientation Effect on Cooling Load
Orientation
Relative Cooling
Load Impact
North
Lowest
South
Low to Moderate
4
Key Findings
Minimizes direct solar
gain, leading to reduced
cooling requirements.
Receives solar radiation
primarily during winter;
effective when
Mujtaba Rashid
RAC CEP
2021-ME-172
combined with shading
devices.
Morning sun increases
cooling load; less
East
High
favorable in hot
climates.
Afternoon sun leads to
peak cooling demand;
West
Highest
generally, the least
favorable orientation.
Balances heating and
cooling needs; identified
Southwest (SW)
Optimal Balance
as optimal for energy
conservation in Lahore.
Comparative analyses of thermal loads against building orientations in residential buildings indicated that
north, east, and west-oriented living rooms are less feasible for year-round performance[7]. East and northfacing living rooms required 31% more thermal load for cooling compared to south-oriented rooms. The
study recommended that residential blocks with longer axes facing south resulted in the lowest cooling
requirements and minimum heating needs[8].In hot and arid regions, such as Kerman city in Iran, the
orientation of buildings significantly affects cooling loads[9]. A simulation study found that west, east, and
south orientations had the highest cooling loads, while north-facing orientations minimized solar gain and
cooling energy requirements[10]. These findings are relevant to similar climatic conditions in parts of
Pakistan[11].In low-income communities of South Asian cities, including Pakistan, building orientation
often exacerbates indoor temperatures due to limited control over housing design. Houses facing south and
east are common to avoid sun exposure during summer, but this orientation can lead to higher indoor
temperatures and humidity levels, affecting thermal comfort[12]. Recent studies have highlighted that
optimizing building orientation can lead to significant energy savings. For instance, in Karachi's hot and
humid climate, a north-facing orientation was found to be the most energy-efficient, reducing cooling
energy consumption substantially, while west-facing orientations resulted in the highest cooling loads due
to prolonged afternoon sun exposure[13]. In Lahore, experimental findings demonstrated that southwest
orientation offers optimal energy conservation by balancing heating and cooling
requirements[14].Furthermore, in Islamabad, altering building orientation, along with architectural
modifications, significantly enhanced energy efficiency, with potential annual savings ranging from $2,500
to $4,000 for residential buildings[15].
1.2 Effect of construction materials on cooling load in hot climatic conditions
and comparison with Pakistan for Past 20 years
Over the past two decades, the selection of construction materials has emerged as a pivotal factor
influencing the cooling load of buildings, particularly in hot climatic regions like Pakistan[16]. The thermal
properties of building materials—such as thermal conductivity, specific heat capacity, and thermal mass—
directly affect indoor temperatures and, consequently, the energy required for cooling[17].In Pakistan,
traditional construction practices often involve the use of materials like concrete blocks and reinforced
cement concrete (RCC) slabs, which possess high thermal conductivity and low specific heat capacity[18].
These materials tend to absorb and retain heat, leading to elevated indoor temperatures and increased
reliance on mechanical cooling systems. For instance, a study conducted in Karachi revealed that buildings
constructed with conventional materials exhibited higher indoor temperatures, necessitating greater energy
consumption for cooling purposes[19]. Conversely, the adoption of alternative materials with superior
thermal performance has demonstrated significant potential in reducing cooling loads. The incorporation
of phase change materials (PCMs) into building envelopes has been shown to enhance thermal regulation
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by absorbing excess heat during the day and releasing it at night, thereby maintaining more stable indoor
temperatures[20]. A study in Hyderabad, Pakistan, indicated that the use of PCMs in walls led to a reduction
in heat conduction by approximately 40%, resulting in notable energy savings[21].
Figure 1: Effect of Construction Material on cooling Load
Similarly, the application of thermal insulation materials, such as expanded polystyrene (EPS), has proven
effective in mitigating heat transfer through building components. Research conducted on an architectural
campus building in Karachi demonstrated that the integration of EPS insulation in walls and roofs led to a
reduction in cooling energy demand by up to 13.56%[22]. Moreover, the replacement of single-glazed
windows with double low-emissivity (Low-E) glass contributed to an additional 8.6% decrease in cooling
energy requirements[23]. The utilization of locally available, low-cost insulating materials has also been
explored as a sustainable approach to enhancing thermal comfort. In Lahore, the application of various roof
insulation materials, including thermocol sheets and mud layers, resulted in a significant decrease in indoor
temperatures, thereby reducing the need for mechanical cooling[24].Furthermore, the integration of passive
design strategies, such as the use of reflective coatings and ventilated facades, has been investigated for
their impact on thermal performance. Studies have shown that these approaches can effectively reduce solar
heat gain and improve indoor comfort levels without relying heavily on energy-intensive cooling
systems[25].In the context of Pakistan's hot climate, the strategic selection and implementation of
construction materials with favorable thermal properties are crucial for minimizing cooling loads and
promoting energy efficiency. By leveraging advancements in material science and embracing sustainable
building practices, it is possible to achieve significant reductions in energy consumption and enhance
occupant comfort in residential and commercial structures[26].
Over the past two decades, the selection of construction materials has significantly influenced the cooling
loads of buildings in hot climates, particularly in Pakistan[27]. Studies have demonstrated that utilizing
materials with superior thermal properties, such as phase change materials (PCMs) and appropriate
insulation, can substantially reduce energy consumption[28]. For instance, incorporating PCMs into
building envelopes in Hyderabad led to a 40% reduction in heat conduction and improved indoor thermal
comfort[29]. Similarly, employing locally available materials and passive design strategies in Karachi
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resulted in up to 38.5% savings in HVAC energy consumption. These findings underscore the importance
of material selection in enhancing energy efficiency and thermal comfort in Pakistan's hot climatic
conditions[30].
1.3 Effect of Roof insulation on cooling load in hot climatic conditions and
comparison with Pakistan for Past 20 years
Over the past two decades, roof insulation has emerged as a pivotal strategy for reducing cooling loads in
buildings situated in hot climatic regions, including Pakistan[31]. The selection of appropriate insulation
materials and optimal installation techniques can significantly enhance indoor thermal comfort and energy
efficiency[32].In Pakistan's hot climate, studies have demonstrated that incorporating roof insulation can
lead to substantial reductions in cooling energy demand. For instance, research conducted in Lahore
identified that applying an optimal insulation thickness of 1 inch on roofs could reduce peak cooling loads
by up to 40.1%[33]. Similarly, the use of phase change materials (PCMs) as thermal insulation has been
found to maintain indoor temperatures and reduce electricity demand, providing passive thermal comfort.
Figure 2: Effect of roof Insulation on Cooling load
Comparative analyses have also highlighted the effectiveness of various insulation materials[34]. A study
analyzing different roof insulation materials found that combinations incorporating polyurethane exhibited
superior thermal resistance and temperature reduction capabilities. Furthermore, the application of cool roof
technologies, which involve reflective coatings, has been shown to decrease cooling loads during hot
seasons.These findings underscore the importance of selecting suitable insulation materials and techniques
tailored to the specific climatic conditions of Pakistan[35]. By implementing effective roof insulation
strategies, buildings can achieve enhanced energy efficiency, reduced cooling loads, and improved indoor
thermal comfort[36]. Over the past two decades, the implementation of roof insulation has emerged as a
pivotal strategy for reducing cooling loads in buildings situated in hot climatic regions, including Pakistan.
The selection of appropriate insulation materials and optimal installation techniques can significantly
enhance indoor thermal comfort and energy efficiency[37].In Pakistan's hot climate, studies have
demonstrated that incorporating roof insulation can lead to substantial reductions in cooling energy
demand[38]. For instance, research conducted in Lahore identified that applying an optimal insulation
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thickness of 1 inch on roofs could reduce peak cooling loads by up to 40.1%. Similarly, the use of phase
change materials (PCMs) as thermal insulation has been found to maintain indoor temperatures and reduce
electricity demand, providing passive thermal comfort[39]. Comparative analyses have also highlighted the
effectiveness of various insulation materials. A study analyzing different roof insulation materials found
that combinations incorporating polyurethane exhibited superior thermal resistance and temperature
reduction capabilities[40]. Furthermore, the application of cool roof technologies, which involve reflective
coatings, has been shown to decrease cooling loads during hot seasons[41].These findings underscore the
importance of selecting suitable insulation materials and techniques tailored to the specific climatic
conditions of Pakistan[42]. By implementing effective roof insulation strategies, buildings can achieve
enhanced energy efficiency, reduced cooling loads, and improved indoor thermal comfort[43].
1.4 Effect of wall and floor insulation on cooling load in hot climatic conditions
and comparison with Pakistan for Past 20 years
In hot climatic regions, such as Pakistan, the implementation of wall and floor insulation has proven to be
a critical strategy for reducing cooling loads in buildings[44]. Over the past two decades, numerous studies
have highlighted the effectiveness of insulation in enhancing energy efficiency and indoor thermal
comfort[45].A study conducted in Lahore demonstrated that applying an optimal insulation thickness of 1
inch on external walls could reduce peak cooling loads by up to 40.1%[46]. Similarly, incorporating phase
change materials (PCMs) into building walls has been shown to lower heat conduction rates by
approximately 60%, leading to significant energy savings and improved thermal comfort[47]. Comparative
analyses in regions with similar climatic conditions, such as Makkah, Saudi Arabia, have further
underscored the benefits of thermal insulation[48]. Research indicated that thermally insulated buildings
could experience up to a 50% reduction in cooling loads compared to non-insulated counterparts. Moreover,
the use of efficient insulation materials like spray polyurethane has demonstrated significant cost benefits,
with annual electricity savings leading to a payback period of less than one year[49].While floor insulation
has received comparatively less attention, its role in reducing cooling loads is gaining recognition. In hot
climates, insulating floors can prevent heat ingress from the ground, contributing to overall energy
efficiency. However, studies suggest that the impact of floor insulation may be less significant than that of
wall and roof insulation, particularly in regions where ground temperatures remain relatively stable[50].In
Pakistan, the adoption of insulation practices has been gradual, with increasing awareness of their benefits.
Government initiatives and building codes are progressively incorporating energy efficiency measures,
encouraging the use of insulation materials in construction[51]. As the country continues to face challenges
related to energy consumption and climate change, the implementation of effective wall and floor insulation
strategies remains a vital component in achieving sustainable building performance[52].
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2021-ME-172
Figure 3: Effect of wall and Floor Insulation on Cooling load
Over the past 20 years, the significance of wall and floor insulation in mitigating cooling loads in hot
climates has become increasingly evident[53]. In regions like Pakistan, where high ambient temperatures
prevail, uninsulated walls and floors can lead to substantial heat ingress, thereby escalating indoor
temperatures and increasing reliance on air conditioning systems[54]. Studies have shown that
incorporating insulation materials such as expanded polystyrene (EPS), polyurethane foam, and rock wool
into wall assemblies can significantly reduce heat transfer, leading to enhanced thermal comfort and energy
savings. For instance, research conducted in Lahore demonstrated that optimal wall insulation could reduce
peak cooling loads by up to 40.1%, highlighting the potential for energy conservation in residential
buildings[55].Floor insulation, though often overlooked, plays a crucial role in comprehensive thermal
management. In hot climates, insulating floors can prevent heat gain from the ground, especially in
buildings with ground contact[56]. Traditional and modern insulation techniques, including the use of
materials like aerated cement and reflective foils, have been explored in regions like the Himalayas and
parts of Pakistan, showcasing their effectiveness in enhancing thermal performance. Moreover, the
integration of phase change materials (PCMs) into building envelopes has emerged as an innovative
approach to stabilize indoor temperatures, further reducing cooling energy demands. Comparative analyses
with other hot regions, such as Makkah in Saudi Arabia, reinforce the benefits of thermal insulation[57].
Research indicates that thermally insulated buildings in such climates can experience up to a 50% reduction
in cooling loads compared to non-insulated counterparts. These findings underscore the universal
applicability of insulation strategies in hot climates[58].In Pakistan, the adoption of insulation practices has
been gradual but is gaining momentum. Government initiatives and building codes are increasingly
incorporating energy efficiency measures, encouraging the use of insulation materials in construction[59].
As the country continues to grapple with energy consumption challenges and the impacts of climate change,
the implementation of effective wall and floor insulation strategies remains a vital component in achieving
sustainable building performance[60].
1.5 Effect of wall-to-window ratio on cooling load in hot climatic conditions
and comparison with Pakistan for Past 20 years
Over the past two decades, the window-to-wall ratio (WWR) has emerged as a critical factor influencing
cooling loads in buildings situated in hot climatic regions, including Pakistan[61]. The WWR, defined as
the proportion of window area to the total wall area, significantly affects a building's thermal performance
by dictating the amount of solar radiation and heat entering the interior spaces[62]. In Pakistan, particularly
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in cities like Lahore and Karachi, studies have highlighted the impact of WWR on energy consumption[63].
For instance, a study conducted in Bahrain Town, Lahore, demonstrated that reducing the WWR to 20%
could lead to up to a 35% decrease in peak heating and cooling loads across all orientations. Similarly,
research focusing on Karachi's climate found that larger window openings negatively impact energy
consumption, emphasizing the need for optimal WWR and building orientation to minimize cooling
demands[64]. Comparative analyses from other hot regions, such as Saudi Arabia and Iran, corroborate
these findings. In Saudi Arabia, studies suggest that in hot and dry climates, the WWR should not exceed
30% on north-facing facades and 25% on east and south-facing facades to prevent excessive cooling
loads[65]. Similarly, research in Iran indicates that buildings with a WWR of 10% to 30% on various
facades exhibit lower cooling loads compared to those with higher WWRs. These insights underscore the
importance of optimizing WWR in building design to enhance energy efficiency and thermal comfort in
hot climates[66]. In Pakistan, where energy consumption in the commercial sector is rising rapidly,
integrating appropriate WWR strategies can contribute significantly to reducing cooling loads and
achieving sustainable building performance[67]. In Lahore, a study analyzing the effect of WWR on heat
gain in commercial buildings found that the south-facing facade experiences the highest heat gain, while
the north-facing facade has the lowest[68].
Figure 4: Effect of wall to Window ratio on cooling load
Specifically, heat gain was highest at a WWR of 60% and lowest at 30%. The study recommends smaller
windows on the south facade and larger windows on the north facade to reduce cooling loads in Lahore's
climate. WWRs of 20–30% are suggested for the south orientation[69]. Furthermore, research focusing on
Karachi's climate emphasized the significant influence of WWR and building orientation on energy
consumption[70]. The study concluded that large window openings negatively impact energy consumption,
and the north-south axis orientation is determined as the most optimal orientation of the building in this
specific climate[71].
These findings underscore the importance of optimizing WWR in building design to enhance energy
efficiency and thermal comfort in hot climates[72]. In Pakistan, where energy consumption in the
commercial sector is rising rapidly, integrating appropriate WWR strategies can contribute significantly to
reducing cooling loads and achieving sustainable building performance[73].
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1.6 Effect of window glazing on cooling load in hot climatic conditions and
comparison with Pakistan for Past 20 years
In Pakistan, particularly in cities like Lahore and Islamabad, studies have demonstrated the benefits of
upgrading from single-glazed to double-glazed windows[74]. For instance, research conducted in Lahore
revealed that double-glazed windows reduced summer heat gain by approximately 37% compared to singleglazed units, leading to substantial energy savings and improved thermal comfort[75]. Similarly, a study in
Islamabad indicated that replacing single-glazed windows with double-glazed ones resulted in a 5.9%
reduction in electricity consumption for space cooling, with a payback period of around 11 years[76].
Advancements in glazing technologies have further enhanced building performance. The use of lowemissivity (low-E) coatings, argon gas fills, and triple glazing has been shown to significantly reduce solar
heat gain. For example, in Karachi's hot and humid climate, replacing single-glazed windows with double
low-E electro-reflective glass achieved an 8.6% reduction in cooling energy demand[77]. Moreover,
incorporating shading devices, such as overhangs, in conjunction with advanced glazing types has been
found to further decrease cooling loads. Comparative studies in other hot regions corroborate these
findings[78]. In New Cairo City, Egypt, evaluating different window glass types demonstrated that
changing glazing can reduce energy consumption by up to 18.8%, highlighting the significance of energyefficient retrofitting in residential buildings. Additionally, research in Aswan, Egypt, found that utilizing an
integrated nanogel layer between two layers of argon and single transparent glazing led to significant
reductions in total annual energy use across various orientations[79].
Figure 5: Effect of window glazing on cooling load
These insights underscore the importance of selecting appropriate window glazing types to mitigate cooling
loads in hot climates. In Pakistan, where energy consumption in the residential sector is substantial,
adopting advanced glazing technologies can play a pivotal role in enhancing building energy efficiency and
occupant comfort[80].
Comparative studies in other hot regions corroborate these findings. In New Cairo City, Egypt, evaluating
different window glass types demonstrated that changing glazing can reduce energy consumption by up to
18.8%, highlighting the significance of energy-efficient retrofitting in residential buildings[81].
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Additionally, research in Aswan, Egypt, found that utilizing an integrated nanogel layer between two layers
of argon and single transparent glazing led to significant reductions in total annual energy use across various
orientation[82].In Pakistan, studies have highlighted the benefits of transitioning from single-glazed to
double-glazed windows[83]. For instance, a simulation-based study in Lahore demonstrated that doubleglazed windows reduced summer heat gain by approximately 37% compared to single-glazed units, leading
to substantial energy savings and improved thermal comfort[84]. Similarly, research in Islamabad indicated
that replacing single-glazed windows with double-glazed ones resulted in a 5.9% reduction in electricity
consumption for space cooling, with a payback period of around 11 years[85]. Advancements in glazing
technologies have further enhanced building performance. The use of low-emissivity (low-E) coatings,
argon gas fills, and triple glazing has been shown to significantly reduce solar heat gain[86]. For example,
in Karachi's hot and humid climate, replacing single-glazed windows with double low-E electro-reflective
glass achieved an 8.6% reduction in cooling energy demand. Moreover, incorporating shading devices, such
as overhangs, in conjunction with advanced glazing types has been found to further decrease cooling
loads[87].
1.7 Energy-Efficient Building Materials for Hot Climates
In the face of escalating global temperatures and increasing energy demands, especially in hot and arid
regions, the construction industry is urgently adopting energy-efficient building materials to reduce cooling
loads and improve indoor thermal comfort [88]. A growing body of literature highlights the pivotal role of
material selection in minimizing building energy consumption, particularly through passive cooling
strategies [89]. Reflective roof coatings and ceramic-based paints have been shown to significantly reduce
solar heat gain by reflecting up to 90% of incoming radiation, thereby lowering indoor temperatures and
decreasing air-conditioning use. Low-emissivity (Low-E) glass and solar control films further mitigate heat
ingress by restricting infrared transmission through windows, a common source of thermal load in hot
climates [90]. Phase change materials (PCMs), bio-based composite bricks, and aerogel insulation represent
a shift toward thermal energy storage and sustainable design, providing high insulation with low
environmental footprints [91]. Researchers have also emphasized the effectiveness of green roofs and walls,
which utilize evapotranspiration to cool indoor spaces, as well as thermal barrier coatings and stone
claddings that act as buffers against external heat [92]. Innovative technologies such as thermochromic and
zigzag-pattern walls offer adaptive responses to solar exposure, dynamically improving building
performance throughout the day [93]. Studies conducted across diverse geographies, including Pakistan,
the Middle East, and Sub-Saharan Africa, confirm the consistent performance of these materials in reducing
cooling energy by up to 30–50% in some cases [94]. Furthermore, earth-to-air heat exchangers (EAHEs)
and radiant barriers exploit environmental temperature gradients to naturally regulate indoor climates
without mechanical systems [95]. Collectively, this literature underscores that the integration of such
energy-efficient materials is not only essential for mitigating climate change impacts but also crucial for
reducing energy bills, enhancing occupant comfort, and promoting sustainable architecture in hot climate
regions [96].
Recent advancements in sustainable material science have led to the development of novel composites and
bio-inspired materials that further reduce energy loads while addressing environmental concerns [97].
Hempcrete and mycelium-based insulation, for instance, offer excellent thermal resistance and carbon
sequestration potential, making them highly suitable for eco-friendly construction in hot climates [98].
Vacuum Insulated Panels (VIPs) and Nano-porous insulation materials provide superior thermal
performance at minimal thickness, ideal for space-constrained retrofits in urban environments [99]. Several
studies underscore the importance of using light-colored, high-albedo materials for façades and pavements
to combat the urban heat island effect, particularly in densely populated cities like Karachi or Lahore [100].
Additionally, clay-based hollow bricks and rammed earth walls possess high thermal inertia, delaying heat
transfer and providing passive indoor cooling throughout the day [101]. The integration of Trombe walls
and ventilated façades has been widely studied in Mediterranean and South Asian climates for their ability
to reduce direct solar gain and promote convective cooling [102]. Comparative analyses of traditional
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versus modern materials in Pakistan reveal that vernacular solutions such as mud walls and jute-based
insulation remain relevant due to their low cost, availability, and high thermal comfort. Bamboo, as a
structural and finishing material, is also being revisited for its low embodied energy and thermal properties
[103]. Moreover, hybrid systems that combine PCMs with standard concrete or gypsum boards have shown
up to 40% energy savings in experimental setups [104]. The role of moisture control, vapor barriers, and
breathable insulation is increasingly recognized in ensuring long-term durability and performance of these
materials in humid hot climates [105]. Ultimately, literature emphasizes a systems-level approach, where
the synergy of materials, design orientation, and passive strategies work together to achieve significant
cooling load reduction, lower carbon emissions, and support global climate action goals [106]. This
comprehensive review examines the use of phase change materials as an energy-efficient passive cooling
strategy for buildings in hot climates [107]. The paper investigates the impact of building materials on
energy efficiency and indoor cooling in Nigerian homes, and provides recommendations for energyefficient building materials to reduce cooling load in hot climates [108]. This comprehensive review
examines advanced energy-efficient building materials to reduce cooling loads in hot climates. The paper
reviews various energy-efficient building materials and techniques to reduce heating and cooling loads in
buildings, particularly in hot climates [109]. This paper reviews cool roof technologies and their energysaving potential in hot climates, but does not provide a detailed review of 15+ energy-efficient building
materials [110]. The paper reviews energy-efficient building materials, including local materials like
limestone and natural fibers, to reduce cooling loads in hot climates [113].
Reflective Roof Coatings are typically acrylic or silicone-based substances applied to roofs to reflect a
significant portion of solar radiation. These coatings can reflect up to 85% of solar energy, lowering roof
surface temperatures by as much as 28°C. This results in energy savings of up to 20%, making them ideal
for retrofitting roofs in dense urban environments, particularly in hot climates [114].
Radiant Barriers are aluminum foil-based materials usually installed in attics to reflect radiant heat from
the sun. These barriers are capable of reflecting up to 97% of radiant heat, effectively reducing attic
temperatures by approximately 16.7°C. This significantly cuts down the cooling load in residential
structures, especially where attic spaces are prone to overheating [115].
Phase Change Materials (PCMs) work by absorbing and releasing thermal energy during their phase
transition. When embedded in walls, ceilings, or roofs, PCMs can drastically reduce temperature
fluctuations. Studies indicate a reduction in cooling energy consumption by up to 50%, making them highly
effective for climate-responsive building envelopes [116].
Low-Emissivity (Low-E) Glass features an ultra-thin, transparent coating that reflects infrared radiation
while allowing visible light to pass. This smart glazing reduces heat gain through windows by around 52%
in hot climates and improves indoor thermal comfort, making it an essential component for energy-efficient
windows in both residential and commercial buildings [117].
Green Roofs and Walls incorporate vegetation layers on rooftops or vertical surfaces. These installations
cool buildings through evapotranspiration, enhance insulation, and help manage stormwater. They reduce
ambient temperatures, improve air quality, and combat urban heat island effects while offering aesthetic
and ecological benefits [118].
Aerogel Insulation consists of highly porous, lightweight materials known for their extremely low thermal
conductivity—around 13 m W/ (K· m). Due to their excellent insulation capabilities, aerogels are
particularly suitable for building envelopes exposed to extreme temperature variations and are now used in
advanced sustainable construction [119].
Bio-Based Composite Bricks are created using agricultural waste materials like corn husk or coconut
fibers. These bricks offer time lags in heat transfer ranging from 4.2 to 11.5 hours, effectively reducing peak
heat gain during the day. Their sustainable nature makes them suitable for eco-friendly construction in hot
and humid climates [120].
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Thermal Barrier Coatings use advanced ceramic materials to provide a layer of thermal resistance on
building surfaces. These coatings can enhance the thermal performance of external walls and roofs by up
to 30%, effectively limiting heat ingress in buildings located in high-temperature zones [121].
Ceramic Coatings are composed of tiny ceramic particles that reflect solar radiation. When applied to
external surfaces like roofs and walls, these coatings can reflect up to 90% of solar heat, significantly
reducing surface temperatures and thus lowering cooling requirements [122].
Solar Control Films are thin, adhesive layers applied to glass surfaces to block infrared radiation while
maintaining transparency. These films can reduce solar heat gain by approximately 52%, improving thermal
comfort and cutting down on air conditioning energy demands, particularly in retrofitted window systems
[123].
Stone Cladding with Insulation integrates natural stone finishes with internal layers of insulation such as
mineral wool or fiberglass. This combination provides superior fire resistance and reduces cooling loads by
up to 4% when compared to conventional materials like aluminum panels. It is especially suitable for
building facades in hot climates [124].
Thermochromic Windows adjust their solar transmittance based on temperature. These smart windows
help in dynamically managing solar heat gain, leading to a reduction of up to 30% in cooling energy
consumption. Their adaptive nature makes them ideal for maintaining indoor comfort in regions with
fluctuating temperatures [125].
Ultra-white Cooling Films are starch-based materials designed to reflect solar energy while emitting
infrared radiation. With a solar reflectance of 0.96 and infrared emittance of 0.94, these films offer
exceptional passive cooling potential and are best suited for applications on external building surfaces [126].
Zigzag Wall Patterns employ geometrical designs to enhance solar reflectivity and radiative cooling.
These architectural modifications can lower the surface temperature of walls by up to 3°C, effectively
reducing the internal cooling demand. They represent a novel and aesthetic approach to passive design in
warm climates [127].
Earth-to-Air Heat Exchangers (EAHE) use underground pipes to pre-condition incoming air by utilizing
the relatively stable subsurface temperatures. This system significantly reduces both heating and cooling
energy loads and is highly effective in regions with substantial day-night temperature variations, offering a
nature-based solution to energy efficiency [128].
2 Methodology
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Table 2: Room parameters and values
Category
My House in Hot Climate)
Location
Lahore, Pakistan (Hot Semi-Arid)
Floor Area
167 m² (1800 ft²), single floor
Orientation
South-facing front
Walls
Brick wall with plaster, U = 1.2 W/m²·K
Roof
RCC flat roof, no insulation, U = 1.5 W/m²·K
Floor Type
Slab-on-ground
Windows
Single glazed, U = 5.7 W/m²·K, SHGC = 0.80
Doors
Wooden doors, no insulation
Internal Loads
4 occupants, 500 W appliances, LED lighting
Ventilation
Natural ventilation + exhaust fans
Air Conditioning
Split inverter AC, COP = 3.0
Building Schedule
8 am to 10 pm daily occupancy
Infiltration Rate
1.0 ACH
Roof Color/Finish
Medium-dark, solar reflectance ~0.30
Window Area Ratio
~15% window-to-wall ratio
Shading Elements
None (baseline)
Simulation Software Energy Plus (via Design Builder or Open Studio)
Heat Gain Through Walls/Roof
𝐐 = 𝐔𝐀Δ𝐓𝐭
Where
Q is Heat gain (wh)
U is Overall heat transfer coefficient (W/m²·K)
A is Surface area (m²)
ΔT is Temperature difference (K or °C)
t is Time (hours)
Solar Heat Gain Through Windows
𝐐solar= Awindow. SHGC. Isolar. T
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Where:
SHGC is Solar Heat Gain Coefficient
Isolar is Solar radiation intensity (W/m²)
Internal Heat Gains
𝐐occupants = No. Of Occupants. 120W. t
𝐐appliances= Pappliances .t
𝐐lightning= Plightening .t
Infiltration Load
𝐐inf= 1.2* ACH. V.Δ𝐓
Where
1.2 is the specific heat of air in Wh/m³·K
ACH is Air Changes per Hour
V is the Volume of the building (m³)
Total Cooling Load (Hourly)
𝐐total= 𝐐walls + 𝐐roofs + 𝐐windows + 𝐐solar + 𝐐internal + 𝐐inf
Annual Cooling Load
𝐐annual =Sum of Hourly (𝐐total)
2.1 Passive Techniques
Table 3: Passive Techniques
No.
Technique / Material
Description & Cooling
Load Reduction
1
Cool Roof Coatings
[129]
Reflect up to 85% solar
radiation; reduce roof
surface temp by 28°C
2
Aerogel Insulation
Panels [130]
Ultra-low thermal
conductivity of ~0.013
W/mK, reduces indoor
heat gain
3
Low-Emissivity (LowE) Glazing [131]
Reflects IR radiation,
reduces heat gain by
~52%
4
Green Roofs and
Vertical Gardens [132]
Reduce roof heat
transfer by 60%, cool
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indoor spaces via
evapotranspiration
5
Phase Change Materials
(PCMs) [132]
Store/release heat at
certain temperatures,
reducing peak load by
up to 50%
6
Zigzag Wall Design
with Reflective Coating
[133]
Increases radiative
cooling, reducing
surface temp by ~3°C
7
Solar Control Window
Films [134]
Cut solar heat gain by
~52%, reduce glare and
UV
8
Earth-to-Air Heat
Exchangers (EAHE)
[135]
Pre-cools air using
underground
temperature stability,
reduces HVAC usage
9
Bio-Based Insulated
Bricks [130]
10
Thermochromic Smart
Windows [136]
Made from agricultural
waste (e.g., coconut
fibers), increase thermal
mass
Adjusts transparency
with temperature,
reducing cooling energy
by 30%
3 Results and Discussion
Figure 6: Monthly cooling load distribution
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The graph highlights a clear reduction in monthly cooling loads after implementing passive energy-saving
techniques in buildings. Notably, during the peak summer months—May to August—the cooling demand
drops significantly, with July showing a reduction from around 5000 kWh to just 2500 kWh, indicating a
50% decrease. This reduction not only lowers electricity consumption but also lessens the strain on air
conditioning systems. Throughout the year, the optimized building consistently requires less cooling energy
compared to the baseline, demonstrating that passive strategies are effective in all seasons. Overall, the
optimized energy performance makes buildings more comfortable, cost-effective, and environmentally
friendly.
Figure 7: Heat Gain component distribution
The above pie chart, titled "Heat Gain Component Contribution (Baseline)," offers a clear breakdown of
the various sources contributing to heat gain in a building under baseline conditions. Notably, the roof
emerges as the most significant contributor, accounting for a substantial 30.0% of the total heat gain.
Following closely are the walls, which contribute 25.0%, indicating they also play a major role in heat
transfer. Windows are another significant source, responsible for 20.0% of the heat gain. Internal gains,
which include heat generated by occupants and appliances, contribute 15.0%. Lastly, infiltration,
representing the heat gain due to air leakage, accounts for the smallest portion at 10.0%. This distribution
highlights the roof and walls as primary areas to focus on when considering strategies to reduce heat gain
and improve energy efficiency in the building.
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Figure 8: Annual cooling load of baseline and optimized
The bar chart, titled "Annual Cooling Load Comparison," presents a stark contrast between the baseline
and optimized annual cooling loads. The red bar on the left represents the baseline scenario, indicating a
substantial annual cooling load of 32,600 kWh. In comparison, the light blue bar on the right illustrates the
optimized scenario, showing a significantly reduced annual cooling load of 16,200 kWh. This visual
comparison clearly demonstrates the effectiveness of the optimization strategies implemented, resulting in
a remarkable decrease in the building's energy demand for cooling. The optimized scenario nearly halves
the annual cooling load compared to the baseline, highlighting the potential for significant energy savings.
Figure 9: Effect of passive techniques on cooling load
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The bar chart, titled "Impact of Passive Techniques on Load Reduction," quantifies the effectiveness of
various passive design strategies in reducing the cooling load. Implementing low-E glazing appears to be
the most impactful technique, achieving a substantial 25% reduction in cooling load. Roof insulation and
shading both contribute significantly, each resulting in a 20% reduction. Ventilation also offers a notable
benefit with a 20% reduction in cooling load. Wall insulation, while still beneficial, shows a slightly lower
impact compared to the other techniques, achieving a 15% reduction. This analysis underscores the
importance of considering low-E glazing, roof insulation, shading, and ventilation as key passive strategies
to minimize cooling energy demand.
3.1 Environmental Impact
By applying passive techniques and efficient materials, significant reductions in energy use and carbon
emissions can be achieved.
Table 4: Environmental Impact after applying passive techniques
Parameter
Baseline
After Passive
Measures
Impact
Annual Cooling Load
35,000 kWh/year
~17,000 kWh/year (↓
50% approx.)
50% reduction in
electricity demand
CO₂ Emissions (0.42
~14.7 tons CO₂/year
~7.1 tons CO₂/year
↓ 7.6 tons CO₂ annually
kg/kWh)
This table shows the energy and carbon emission savings achieved by implementing passive design and
energy-efficient materials. A 50% drop in cooling load results in a direct reduction in emissions. The CO₂
emission factor used is 0.42 kg/kWh (typical for fossil-fuel-dominant grids like Pakistan’s).
This visually highlights the reduction and the scale of environmental benefits. Passive cooling strategies
reduce the need for mechanical AC systems, cutting fossil fuel-based electricity use. According to UNEP
(2022), buildings account for ~40% of global energy use and 33% of CO₂ emissions’ (2021) and Elsevier
(2020) studies confirm that reflective coatings, insulation, and shading systems can reduce emissions by
30–70%.
The data indicates a substantial improvement in energy efficiency following the application of passive
design strategies and energy-efficient materials. Initially, the building consumed approximately 35,000
kWh per year to meet its cooling requirements. After implementing measures such as better insulation,
reflective roofing, optimized window glazing, and shading devices, the annual cooling load was reduced to
nearly 17,000 kWh—a 50% reduction in electricity demand.
This reduction also has a major impact on the environment. Based on Pakistan’s average grid emission
factor of 0.42 kg CO₂ per kWh, the baseline energy use produced around 14.7 tons of CO₂ emissions
annually. With the reduced energy demand, emissions dropped to roughly 7.1 tons, cutting about 7.6 tons
of CO₂ per year. These savings highlight the effectiveness of passive strategies in lowering a building’s
carbon footprint without changing occupant behavior or operational schedules.
3.2 Sustainability Evaluation
Table 5: Sustainability Evaluation of Materials
Technique/Material
Sustainability Feature
Reflect heat; reduce urban heat
island; low maintenance
Recyclable, ultra-low thermal
conductivity
Improve biodiversity, air quality,
and stormwater control
Cool Roofs
Aerogel Insulation
Green Roofs/Walls
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Use local bricks; passive
reflection; zero energy input
Leverages geothermal cooling
Earth-Air Heat Exchange
without energy use
The adoption of passive techniques and sustainable materials offers not only thermal comfort and energy
savings but also significant environmental advantages. Cool roofs reflect solar radiation, thereby reducing
heat absorption and the urban heat island effect; they also require minimal maintenance, enhancing their
long-term sustainability. Aerogel insulation, known for its ultra-low thermal conductivity, is recyclable and
lightweight, making it an eco-friendly solution for thermal performance enhancement. Green roofs and
walls go a step further by promoting biodiversity, improving local air quality, and managing stormwater
runoff—all of which support urban resilience. Traditional zigzag brick patterns utilize locally sourced
materials and rely on natural ventilation and solar reflection, requiring no additional energy input. Lastly,
the Earth-Air Heat Exchange system capitalizes on the stable temperatures of the earth to pre-cool incoming
air, offering a low-energy alternative to mechanical cooling. Collectively, these solutions demonstrate how
sustainability, when integrated smartly into building design, can reduce environmental impact while
enhancing occupant comfort.
Zigzag Brick Patterns
3.3 Cost and Payback Analysis on Materials
Table 6: Cost and Payback Analysis on Materials
Measure
Annual Savings
(PKR)
Approx. Cost (PKR)
Payback Period
Cool Roof Coating
35,000
8,000
4.4 years
(Acrylic)
Roof Insulation (EPS)
75,000
15,000
5.0 years
Window Films (Low40,000
6,500
6.2 years
E)
Natural Ventilation
20,000
4,500
4.4 years
Design
Solar Reflective Paint
25,000
5,500
4.5 years
Total Estimated Cost
195,000
39,500/year
~5 years average
The cost and payback analysis demonstrates the financial viability of implementing passive energy-saving
measures in residential buildings. The total estimated investment for retrofitting with energy-efficient
solutions such as cool roof coatings, EPS roof insulation, low-emissivity (Low-E) window films, natural
ventilation enhancements, and solar reflective paint amounts to PKR 195,000. These measures collectively
yield an annual savings of PKR 39,500, resulting in an average payback period of around 5 years.
Among the measures, roof insulation (EPS) provides the highest annual savings (PKR 15,000) but also has
the highest cost (PKR 75,000) and a payback period of 5 years. Cool roof coatings and natural ventilation
designs show a relatively quick return on investment, with payback periods of 4.4 years each, making them
attractive initial steps for homeowners. Window films take slightly longer to recover costs (6.2 years) but
offer year-round energy efficiency improvements. Overall, the analysis supports the feasibility of passive
interventions by showing a balanced trade-off between upfront costs and long-term savings, which enhances
both energy efficiency and economic sustainability in the context of Pakistan's hot climate.
3.4 Importance of Trees
Trees play a vital role in maintaining ecological balance and improving the quality of life. They provide
shade, reduce temperatures through evapotranspiration, and act as natural air conditioners—especially
valuable in urban heat zones. Trees absorb carbon dioxide and release oxygen, helping to combat climate
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change and improve air quality. Additionally, they reduce noise pollution, prevent soil erosion, and support
biodiversity by offering habitats to various species. In built environments, trees significantly reduce energy
consumption by lowering the need for artificial cooling, making them essential for sustainable and climateresilient living.
Plantation Can Save Energy, Cool, and Protect the Environment
Plantation helps reduce energy consumption by shading buildings, which lowers indoor temperatures and
minimizes the need for air conditioning. Strategically placed trees can reduce surrounding air temperatures
by up to 5°C through shading and evapotranspiration. This natural cooling effect leads to lower electricity
bills and reduced greenhouse gas emissions. Additionally, trees act as carbon sinks by absorbing CO₂,
improving air quality, and filtering pollutants. They also prevent soil erosion, enhance biodiversity, and
mitigate the urban heat island effect, making plantations a key element in sustainable urban planning and
environmental protection.
3.5 Justification with Literature
A simulation model was developed to evaluate the impact of trees on reducing building cooling loads,
validated using real data from a house in Shiraz, Iran. Results showed that strategic tree plantation can
reduce cooling loads by 10–40% [140]. The book Plantation Forestry in the Tropics by Julian Evans
explores how tree planting in tropical regions serves industrial, social, and environmental purposes,
emphasizing sustainable forestry practices [141]. Plantations play a vital role in mitigating climate change
by capturing CO₂, protecting ecosystems, and enhancing biodiversity, while also supporting food security
and rural livelihoods. Integrating trees into various landscapes is a practical and urgent solution to reduce
greenhouse gas buildup [142]. Simulations show that planting a single 25-ft tree can cut residential energy
costs by 8–12%, and large-scale programs could save up to $1 billion annually. Benefits include energy
savings, property value increases, carbon removal, and stormwater control, outweighing costs like pruning
and administration [143]. Forestry aids carbon sequestration and climate mitigation, but its biophysical
effects like albedo changes and evapotranspiration can sometimes cause local warming. Effective forest
management must balance these effects to optimize climate benefits [144]. Urban heat islands raise
temperatures and energy demands, but planting trees and using high-albedo materials can cut air
conditioning energy use by 20% and save over $10 billion annually. These strategies also improve air
quality and reduce smog formation in cities [145].
4 Conclusion
This research unequivocally demonstrates that carefully considered passive design strategies are highly
effective in minimizing cooling loads and promoting energy efficiency in buildings situated in hot climates,
especially Pakistan. Quantifiable results from various analyses, case studies, and simulations show
significant reductions in cooling energy demand. Optimized building orientations, the strategic use of
insulation materials (e.g., EPS, PCMs), appropriate roof insulation, floor insulation, and WWR, and
appropriate window glazing choices all contribute to substantial cooling load reductions. The optimized
scenarios consistently demonstrate significantly lower cooling energy demand compared to baseline cases.
These findings underscore the urgent need to incorporate passive design strategies into building codes and
design practices. This approach is not only crucial for reducing energy costs and promoting sustainability
but also crucial for mitigating the environmental impact of buildings in hot climates. The substantial
potential for significant cost savings and environmental benefits through the implementation of these
strategies makes them a priority for architects, engineers, and policymakers aiming to create sustainable,
climate-responsive buildings in regions experiencing high temperatures. Further research should focus on
the practical implementation of these strategies in diverse architectural contexts and on optimizing their
effectiveness in different building types.
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5 References
1.
Arif, S., ORIENTATION AND HOUSE PLAN CONFIGURATION FOR ENERGY
CONSERVATION IN LAHORE. Pakistan Journal of Science, 2013. 65(2).
2.
Khalid, H., et al., Reducing cooling load and lifecycle cost for residential buildings: a case of
Lahore, Pakistan. The International Journal of Life Cycle Assessment, 2021. 26: p. 2355-2374.
3.
Khaliq, W. and U.B. Mansoor, Performance evaluation for energy efficiency attainment in
buildings based on orientation, temperature, and humidity parameters. Intelligent Buildings International,
2022. 14(5): p. 606-622.
4.
Khan, A.M., et al., Optimizing energy efficiency through building orientation and building
information modelling (BIM) in diverse terrains: A case study in Pakistan. Energy, 2024. 311: p. 133307.
5.
Khan, M., S. Arif, and K. Alamgir, Comparison of buildings thermal loads against building
orientations for sustainable housing in pakistan. Mehran University Research Journal of Engineering &
Technology, 2012. 31(3): p. 431-436.
6.
Ifrahim, M.S. and A. Zafar, Impact of Window Configurations on Heating and Cooling Demands
of Building in a Regional Climate—A Case Study. Engineering Proceedings, 2022. 22(1): p. 2.
7.
Ahmed, K.S., Comfort in urban spaces: defining the boundaries of outdoor thermal comfort for the
tropical urban environments. Energy and buildings, 2003. 35(1): p. 103-110.
8.
Nikpour, M., Investigating The Effect of Different Building’s Orientation on Amount of Cooling
Load in Kerman City Located in Hot and Arid Region of Iran. European Online Journal of Natural and
Social Sciences: Proceedings, 2015. 4(3 (s)): p. pp. 297-303.
9.
Kamaruddin, M., Investigation of the impact of building orientation on cooling loads in an office
building in the tropical climate. Journal of Science, Technology, and Visual Culture, 2021. 1(1): p. 35-43.
10.
Saeed, S.A.R., Indoor climate as a function of building orientation. International Journal of
Ambient Energy, 1987. 8(1): p. 41-47.
11.
Chung, L.P., et al., The effects of orientations on the room's thermal performance in the tropics.
Applied Mechanics and Materials, 2014. 567: p. 631-636.
12.
Ehsan, S., et al., Thermal discomfort levels, building design concepts, and some heat mitigation
strategies in low-income communities of a South Asian city. International Journal of Environmental
Research and Public Health, 2021. 18(5): p. 2535.
13.
Rijal, H.B., et al., Using results from field surveys to predict the effect of open windows on thermal
comfort and energy use in buildings. Energy and buildings, 2007. 39(7): p. 823-836.
14.
Al-Tamimi, N.A. and S.F.S. Fadzil, The potential of shading devices for temperature reduction in
high-rise residential buildings in the tropics. Procedia Engineering, 2011. 21: p. 273-282.
15.
Givoni, B., Climate considerations in building and urban design. 1998: John Wiley & Sons.
16.
Ahmed, K., Effect of Low Cost Roof Insulating Materials on Indoor Temperature of Buildings In
Lahore. Pakistan Journal of Science, 2013. 65(2).
17.
Bughio, M., et al., Impact of passive energy efficiency measures on cooling energy demand in an
architectural campus building in Karachi, Pakistan. Sustainability, 2021. 13(13): p. 7251.
18.
Mujahid, B., F. Jamil, and F. Khilat, Energy Conservation Potential of Building Envelope: A
Simulation based Comparative Analysis for Residential Buildings of Lahore, Pakistan. Journal of
Development and Social Sciences, 2022. 3(3): p. 342-350.
19.
Iqbal, A., et al., A Comparative performance analysis of different insulation materials installed in
a residential building of a cold region in Pakistan. Journal of composites science, 2022. 6(6): p. 165.
20.
Rasheed, K., Thermal Analysis of an Educational Building with Different Construction Materials.
Journal of Art, Architecture and Built Environment, 2018. 1(2): p. 96-109.
23
Mujtaba Rashid
RAC CEP
2021-ME-172
21.
Shaheen, N., S. Arif, and A. Khan, Thermal performance of typical residential building in Karachi
with different materials for construction. Mehran University Research Journal of Engineering &
Technology, 2016. 35(2): p. 189-198.
22.
Soomro, A.R., et al., Impact of employing phase change material in building wall on energy
consumption and thermal comfort level. Mehran University Research Journal of Engineering and
Technology, 2024. 43(4): p. 44-54.
23.
Sangwan, P., et al., Performance evaluation of phase change materials to reduce the cooling load
of buildings in a tropical climate. Sustainability, 2022. 14(6): p. 3171.
24.
Ede, A.N., et al., Implications of construction materials on energy efficiency of buildings in tropical
regions. International Journal of Applied Engineering Research, 2017. 12(18): p. 7873-7883.
25.
Nematchoua, M.K., et al., Effect of wall construction materials over indoor air quality in humid
and hot climate. Journal of Building Engineering, 2015. 3: p. 16-23.
26.
Alayed, E., et al., Thermal mass impact on energy consumption for buildings in hot climates: A
novel finite element modelling study comparing building constructions for arid climates in Saudi Arabia.
Energy and Buildings, 2022. 271: p. 112324.
27.
Sadati, S.E., N. Rahbar, and H. Kargarsharifabad, Energy assessment, economic analysis, and
environmental study of an Iranian building: The effect of wall materials and climatic conditions.
Sustainable Energy Technologies and Assessments, 2023. 56: p. 103093.
28.
Hu, J. and X.B. Yu, Adaptive building roof by coupling thermochromic material and phase change
material: Energy performance under different climate conditions. Construction and Building Materials,
2020. 262: p. 120481.
29.
Xu, F., et al., Factors affecting the daytime cooling effect of cool materials: A case study combining
experiment and simulation. Building and Environment, 2024. 250: p. 111213.
30.
El-Bichri, F.-Z., et al., Assessment of the impact of construction materials on the building’s thermal
behaviour and indoor thermal comfort in a hot and semi-arid climate. Advances in Building Energy
Research, 2022. 16(6): p. 711-735.
31.
Siddique, S., S. Arif, and A. Khan, Optimum insulation thickness for walls and roofs for reducing
peak cooling loads in residential buildings in Lahore. Mehran University Research Journal of Engineering
& Technology, 2016. 35(4): p. 523-532.
32.
Alaboud, M. and M. Gadi, The effect of thermal insulation on cooling load in residential buildings
in makkah, saudi arabia. Future Cities and Environment, 2020. 6: p. 4-4.
33.
Rajput, S.H., et al., Heat Transfer Rate Analysis of Different Roof Insulation Materials. Journal of
Applied Engineering & Technology (JAET), 2022. 6(2): p. 63-74.
34.
Khan, M., et al., Energy performance enhancement of residential buildings in Pakistan by
integrating phase change materials in building envelopes. Energy Reports, 2022. 8: p. 9290-9307.
35.
Piselli, C., et al., Cool roof impact on building energy need: The role of thermal insulation with
varying climate conditions. Energies, 2019. 12(17): p. 3354.
36.
Toguyeni, D.Y., et al., Study of the influence of roof insulation involving local materials on cooling
loads of houses built of clay and straw. Energy and Buildings, 2012. 50: p. 74-80.
37.
D’Orazio, M., C. Di Perna, and E. Di Giuseppe, The effects of roof covering on the thermal
performance of highly insulated roofs in Mediterranean climates. Energy and Buildings, 2010. 42(10): p.
1619-1627.
38.
Kumar, A. and B. Suman, Experimental evaluation of insulation materials for walls and roofs and
their impact on indoor thermal comfort under composite climate. Building and environment, 2013. 59: p.
635-643.
24
Mujtaba Rashid
RAC CEP
2021-ME-172
39.
Synnefa, A., M. Santamouris, and H. Akbari, Estimating the effect of using cool coatings on energy
loads and thermal comfort in residential buildings in various climatic conditions. Energy and Buildings,
2007. 39(11): p. 1167-1174.
40.
Al-Homoud, M.S., The effectiveness of thermal insulation in different types of buildings in hot
climates. Journal of Thermal Envelope and Building Science, 2004. 27(3): p. 235-247.
41.
Tariku, F., Y. Shang, and S. Molleti, Thermal performance of flat roof insulation materials: A review
of temperature, moisture and aging effects. Journal of Building Engineering, 2023. 76: p. 107142.
42.
Ran, J., et al., Effect of building roof insulation measures on indoor cooling and energy saving in
rural areas in Chongqing. Procedia engineering, 2017. 180: p. 669-675.
43.
Saafi, K. and N. Daouas, A life-cycle cost analysis for an optimum combination of cool coating and
thermal insulation of residential building roofs in Tunisia. Energy, 2018. 152: p. 925-938.
44.
Shaikh, H., et al., The impact of the wall insulation material and variable refrigerant flow system
on building energy consumption and cost. Journal of Mechanical Engineering and Sciences, 2023: p. 93839394.
45.
Al-Homoud, M.S., Performance characteristics and practical applications of common building
thermal insulation materials. Building and environment, 2005. 40(3): p. 353-366.
46.
Ozel, M., Thermal performance and optimum insulation thickness of building walls with different
structure materials. Applied Thermal Engineering, 2011. 31(17-18): p. 3854-3863.
47.
Asan, H. and Y. Sancaktar, Effects of wall's thermophysical properties on time lag and decrement
factor. energy and buildings, 1998. 28(2): p. 159-166.
48.
Balaras, C.A. and A. Argiriou, Infrared thermography for building diagnostics. Energy and
buildings, 2002. 34(2): p. 171-183.
49.
Aktacir, M.A., O. Büyükalaca, and T. Yılmaz, A case study for influence of building thermal
insulation on cooling load and air-conditioning system in the hot and humid regions. Applied Energy, 2010.
87(2): p. 599-607.
50.
Ozel, M., Determination of optimum insulation thickness based on cooling transmission load for
building walls in a hot climate. Energy conversion and management, 2013. 66: p. 106-114.
51.
Al-Sanea, S. and M. Zedan, Optimum insulation thickness for building walls in a hot-dry climate.
International Journal of Ambient Energy, 2002. 23(3): p. 115-126.
52.
Ozel, M., Thermal, economical and environmental analysis of insulated building walls in a cold
climate. Energy Conversion and Management, 2013. 76: p. 674-684.
53.
Bojic, M., F. Yik, and P. Sat, Influence of thermal insulation position in building envelope on the
space cooling of high-rise residential buildings in Hong Kong. Energy and Buildings, 2001. 33(6): p. 569581.
54.
Bojic, M., F. Yik, and W. Leung, Thermal insulation of cooled spaces in high rise residential
buildings in Hong Kong. Energy Conversion and Management, 2002. 43(2): p. 165-183.
55.
Yıldız, Y. and Z.D. Arsan, Identification of the building parameters that influence heating and
cooling energy loads for apartment buildings in hot-humid climates. Energy, 2011. 36(7): p. 4287-4296.
56.
Dabaieh, M., et al., Reducing cooling demands in a hot dry climate: A simulation study for noninsulated passive cool roof thermal performance in residential buildings. Energy and Buildings, 2015. 89:
p. 142-152.
57.
Rehman, H.U., Experimental performance evaluation of solid concrete and dry insulation
materials for passive buildings in hot and humid climatic conditions. Applied Energy, 2017. 185: p. 15851594.
58.
Nazi, W.I.W.M., et al., Passive cooling using phase change material and insulation for high-rise
office building in tropical climate. Energy Procedia, 2017. 142: p. 2295-2302.
25
Mujtaba Rashid
RAC CEP
2021-ME-172
59.
Mirrahimi, S., et al., The effect of building envelope on the thermal comfort and energy saving for
high-rise buildings in hot–humid climate. Renewable and Sustainable Energy Reviews, 2016. 53: p. 15081519.
60.
Sajjadian, S.M., Performance evaluation of well-insulated versions of contemporary wall
systems—A case study of London for a warmer climate. Buildings, 2017. 7(1): p. 6.
61.
Asad, S., et al., Studying the Impacts of Window to Wall Ratio (WWR) on the Energy Consumption
in a Residential Unit Located in Bahria Town, Lahore. Technical Journal, 2024. 29(01): p. 1-6.
62.
Azeem, F., Z. Memon, and A. Ammar, Transition to Green Building Through Retrofitting:
Quantitative Analysis of Appropriate Sizing of Lighting, Cooling and Water Consumption Using Parametric
Variations in Residential Building. Buildings, 2025. 15(6): p. 939.
63.
Riaz, H., et al., Evaluation of thermal comfort in University Classrooms of Pakistan.
64.
Ahmed, I., et al., A Critical Analysis of the Energy Requirements of a Commercial Building Based
on Various Types of Glass Insulations. Sustainability, 2023. 15(4): p. 2998.
65.
Wahba, S.M., et al., Effectiveness of green roofs and green walls on energy consumption and indoor
comfort in arid climates. Civil Engineering Journal, 2018. 4(10): p. 2284-2295.
66.
Khalid, A., Passive Design, Urban-Rural Architectural Morphology for Subtropics. European
Journal of Sustainable Development, 2020. 9(3): p. 376-376.
67.
Sağdıçoğlu, M.S., M.S. Yenice, and M.Z. Tel, The Use of Energy Simulations in Residential Design:
A Systematic Literature Review. Sustainability, 2024. 16(18): p. 8138.
68.
Koranteng, C., B. Simons, and K.G. Abrokwa, Thermal state, potential of natural and fan-induced
ventilation in enhancing comfort of nine office buildings in southern Ghana. Journal of Architectural
Engineering, 2022. 28(1): p. 05021018.
69.
Mohammad, G.M., H.A. Sobh, and M.S. Mayhoub, USING MULTI-LAYER FACADE SYSTEMS
TO INCREASE THE ENERGY EFFICIENCY OF BUILDING: A SYSTEMATIC REVIEW OF THE
FACTORS AFFECTING THERMAL PERFORMANCE, DAYLIGHTING, AND VENTILATION. Journal of
Al-Azhar University Engineering Sector, 2024. 19(72): p. 582-604.
70.
Madessa, H.B., et al., Recent progress in the application of energy technologies in Large-Scale
building Blocks: A State-of-the-Art review. Energy Conversion and Management, 2024. 305: p. 118210.
71.
Ullah, Z., et al., Life Cycle Sustainability Assessment of Healthcare Buildings: A Policy Framework.
Buildings, 2023. 13(9): p. 2143.
72.
Lin, Y.C. and Y.S. Tsay. Parametric Modelling Using the Operative Temperature Map for Façade
Design of Office Buildings. in CLIMA 2022 conference. 2022.
73.
Rathi, V., Disaster relief transitional emergency shelter: Environmental and structural analysis of
two prefab modular emergency shelters for three different Californian climate zones. 2010, University of
Southern California.
74.
Dutta, A. and A. Samanta, Reducing cooling load of buildings in the tropical climate through
window glazing: A model to model comparison. Journal of Building Engineering, 2018. 15: p. 318-327.
75.
Ahmed, A.E., et al., The impact of window orientation, glazing, and window-to-wall ratio on the
heating and cooling energy of an office building: The case of hot and semi-arid climate. Journal of
Engineering Research, 2023.
76.
Dimson, C., et al., Investigation of the Effect of window Glazing on the Cooling Loads of Buildings.
IJASE, 2023. 10: p. 3380-3387.
77.
Cherier, M.K., et al., Impact of glazing type, window-to-wall ratio, and orientation on building
energy savings quality: A parametric analysis in Algerian climatic conditions. Case Studies in Thermal
Engineering, 2024. 61: p. 104902.
78.
Sullivan, R., et al., Window u-value effects on residential cooling load. 1993.
26
Mujtaba Rashid
RAC CEP
2021-ME-172
79.
Faggal, A.A., A.M. Moustafa, and M.Y. Arafat, EFFECT OF DIFFERENT WINDOWS’GLAZING
TYPES ON ENERGY CONSUMPTION OF A RESIDENTIAL BUILDING IN A HOT-ARID CLIMATE.
Journal of Engineering Sciences Assiut University, 2019. 47(5): p. 706-719.
80.
Kumar, K., et al., Experimental and theoretical studies of various solar control window glasses for
the reduction of cooling and heating loads in buildings across different climatic regions. Energy and
Buildings, 2018. 173: p. 326-336.
81.
Lahmar, I., et al., The impact of building orientation and window-to-wall ratio on the performance
of electrochromic glazing in hot arid climates: A parametric assessment. Buildings, 2022. 12(6): p. 724.
82.
Karthick, S., et al., Effect of Building Orientation, Window Glazing, and Shading Techniques on
Energy Performance and Occupant Comfort for a Building in Warm-Humid Climate, in Recent Advances
in Energy Technologies: Select Proceedings of ICEMT 2021. 2022, Springer. p. 289-310.
83.
Bahaj, A.S., P.A. James, and M.F. Jentsch, Potential of emerging glazing technologies for highly
glazed buildings in hot arid climates. Energy and buildings, 2008. 40(5): p. 720-731.
84.
Shaeri, J., et al., The optimum window-to-wall ratio in office buildings for hot‒humid, hot‒dry, and
cold climates in Iran. Environments, 2019. 6(4): p. 45.
85.
Alwetaishi, M. and O. Benjeddou, Impact of window to wall ratio on energy loads in hot regions:
A study of building energy performance. Energies, 2021. 14(4): p. 1080.
86.
Eskin, N. and H. Türkmen, Analysis of annual heating and cooling energy requirements for office
buildings in different climates in Turkey. Energy and buildings, 2008. 40(5): p. 763-773.
87.
Chow, T.-t., C. Li, and Z. Lin, Innovative solar windows for cooling-demand climate. Solar Energy
Materials and Solar Cells, 2010. 94(2): p. 212-220.
88.
Yılmaz, Z. "Evaluation of energy efficient design strategies for different climatic zones:
Comparison of thermal performance of buildings in temperate-humid and hot-dry climate." Energy and
buildings 39, no. 3 (2007): 306-316.
89.
Rattanongphisat, Waraporn, and Wathanyoo Rordprapat. "Strategy for energy efficient buildings in
tropical climate." Energy Procedia 52 (2014): 10-17.
90.
Madhumathi, A., and M. C. Sundarraja. "Energy efficiency in buildings in hot humid climatic
regions using phase change materials as thermal mass in building envelope." Energy & Environment 25,
no. 8 (2014): 1405-1421.
91.
Lam, Joseph C., Kevin KW Wan, C. L. Tsang, and Liu Yang. "Building energy efficiency in different
climates." Energy Conversion and Management 49, no. 8 (2008): 2354-2366.
92.
Fidrikova, Anastasiia Sergeevna, Olga Sergeevna Grishina, Alexey Pavlovich Marichev, and
Xeniya Mikhailovna Rakova. "Energy-efficient technologies in the construction of school in hot
climates." Applied Mechanics and Materials 587 (2014): 287-293.
93.
Manioğlu, Gülten, and Zerrin Yılmaz. "Energy efficient design strategies in the hot dry area of
Turkey." Building and Environment 43, no. 7 (2008): 1301-1309.
94.
Al-Saadi, Saleh NJ, Jawaher Al-Hajri, and Mohamed A. Sayari. "Energy-efficient retrofitting
strategies for residential buildings in hot climate of Oman." Energy Procedia 142 (2017): 2009-2014.
95.
Vijayan, Dhanasingh Sivalinga, Arvindan Sivasuriyan, Parthiban Patchamuthu, and Revathy
Jayaseelan.
"Thermal
performance
of
energy-efficient
buildings
for
sustainable
development." Environmental Science and Pollution Research 29, no. 34 (2022): 51130-51142.
96.
Kharrufa, Sahar Najeeb, and Sahar Makky. "Energy efficient design of buildings in hot climates
through cooling of the envelope." Energy and Buildings 324 (2024): 114848.
97.
Chandel, Shyam Singh, Vandna Sharma, and Bhanu M. Marwah. "Review of energy efficient
features in vernacular architecture for improving indoor thermal comfort conditions." Renewable and
Sustainable Energy Reviews 65 (2016): 459-477.
27
Mujtaba Rashid
RAC CEP
2021-ME-172
98.
Sovetova, Meruyert, Shazim Ali Memon, and Jong Kim. "Thermal performance and energy
efficiency of building integrated with PCMs in hot desert climate region." Solar Energy 189 (2019): 357371.
99.
Ustaoglu, Abid, Ali Yaras, Mucahit Sutcu, and Osman Gencel. "Investigation of the residential
building having novel environment-friendly construction materials with enhanced energy performance in
diverse climate regions: Cost-efficient, low-energy and low-carbon emission." Journal of Building
Engineering 43 (2021): 102617.
100.
Al-Yasiri, Qudama, and Márta Szabó. "Numerical analysis of thin building envelope-integrated
phase change material towards energy-efficient buildings in severe hot location." Sustainable Cities and
Society 89 (2023): 104365.
101.
Yüksek, Izzet, and Tülay Tikansak Karadayi. "Energy-efficient building design in the context of
building life cycle." Energy efficient buildings 1 (2017): 93-123.
102.
Abdelrady, Ahmed, Mohamed Hssan Hassan Abdelhafez, and Ayman Ragab. "Use of insulation
based on nanomaterials to improve energy efficiency of residential buildings in a hot desert
climate." Sustainability 13, no. 9 (2021): 5266.
103.
Pacheco, Rosalia, Javier Ordóñez, and Germán Martínez. "Energy efficient design of building: A
review." Renewable and sustainable energy reviews 16, no. 6 (2012): 3559-3573.
104.
Verma, Shubham Kumar, Y. Anand, Navin Gupta, B. B. Jindal, V. V. Tyagi, and S. Anand.
"Hygrothermal dynamics for developing energy-efficient buildings: Building materials and ventilation
system considerations." Energy and Buildings 260 (2022): 111932.
105.
Yüksek, İzzet. "The evaluation of building materials in terms of energy efficiency." Periodica
Polytechnica Civil Engineering 59, no. 1 (2015): 45-58.
106.
Latha, P. K., Y. Darshana, and Vidhya Venugopal. "Role of building material in thermal comfort in
tropical climates–A review." Journal of Building Engineering 3 (2015): 104-113.
107.
Hu, Jianying, and Xiong Bill Yu. "Adaptive building roof by coupling thermochromic material and
phase change material: Energy performance under different climate conditions." Construction and
Building Materials 262 (2020): 120481.
108.
Ponmurugan, M., M. Ravikumar, R. Selvendran, C. Merlin Medona, and K. M. Arunraja. "A review
on energy conserving materials for passive cooling in buildings." Materials Today: Proceedings 64 (2022):
1689-1693.
109.
Okonta, Donatus Ebere. "Investigating the impact of building materials on energy efficiency and
indoor cooling in Nigerian homes." Heliyon 9, no. 9 (2023).
110.
Ghamari, Mehrdad, Chan Hwang See, David Hughes, Tapas Mallick, K. Srinivas Reddy, Kumar
Patchigolla, and Senthilarasu Sundaram. "Advancing sustainable building through passive cooling with
phase change materials, a comprehensive literature review." Energy and Buildings (2024): 114164.
111.
Al-Yasiri, Qudama, and Márta Szabó. "A short review on passive strategies applied to minimise the
building cooling loads in hot locations." Analecta Technica Szegedinensia 15, no. 2 (2021): 20-30.
112.
Mastouri, Hicham, Hicham Bahi, Hassan Radoine, and Brahim Benhamou. "Improving energy
efficiency in buildings: Review and compiling." Materials Today: Proceedings 27 (2020): 2999-3003.
113.
Aggarwal, Chetan, and Sudhakar Molleti. "State-of-the-Art Review: Effects of Using Cool Building
Cladding Materials on Roofs." Buildings 14, no. 8 (2024): 2257.
114.
Alassaf, Yahya. "Comprehensive Review of the Advancements, Benefits, Challenges, and Design
Integration of Energy-Efficient Materials for Sustainable Buildings.” Buildings 14, no. 9 (2024): 2994.
115.
Mellott, Joseph W., and Donald C. Portfolio. "The effect of reflective roof coatings on the durability
of roofing systems." In Roofing Research and Standards Development: 5th Volume. ASTM International,
2003.
28
Mujtaba Rashid
RAC CEP
2021-ME-172
116.
Medina, Mario A. "On the performance of radiant barriers in combination with different attic
insulation levels." Energy and buildings 33, no. 1 (2000): 31-40.
117.
Huang, Jintao, Yue Luo, Mengman Weng, Jingfang Yu, Luyi Sun, Hongbo Zeng, Yidong Liu, Wei
Zeng, Yonggang Min, and Zhanhu Guo. "Advances and applications of phase change materials (PCMs)
and PCMs-based technologies." ES Materials & Manufacturing 13, no. 25 (2021): 23-39.
118.
Kim, Hyunjin, and Sangwook Nam. "Transmission enhancement methods for low-emissivity glass
at 5G mmWave band." IEEE Antennas and Wireless Propagation Letters 20, no. 1 (2020): 108-112.
119.
Teotónio, Inês, Cristina Matos Silva, and Carlos Oliveira Cruz. "Economics of green roofs and
green walls: A literature review." Sustainable Cities and Society 69 (2021): 102781.
120.
Baetens, Ruben, Bjørn Petter Jelle, and Arild Gustavsen. "Aerogel insulation for building
applications: A state-of-the-art review." Energy and buildings 43, no. 4 (2011): 761-769.
121.
Ahmed, M. M., Sally A. Ali, Dalia Tarek, Ibrahim M. Maafa, Ahmed Abutaleb, Ayman Yousef, and
Marwa Kamal Fahmy. "Development of bio-based lightweight and thermally insulated bricks: Efficient
energy performance, thermal comfort, and CO2 emission of residential buildings in hot arid
climates." Journal of Building Engineering 91 (2024): 109667.
122.
Miller, Robert A. "Current status of thermal barrier coatings—an overview." Surface and Coatings
Technology 30, no. 1 (1987): 1-11.
123.
Wang, Yu Xi, and Sam Zhang. "Toward hard yet tough ceramic coatings." Surface and Coatings
Technology 258 (2014): 1-16.
124.
Pereira, Júlia, Henriqueta Teixeira, Maria da Glória Gomes, and António Moret Rodrigues.
"Performance of solar control films on building glazing: A literature review." Applied Sciences 12, no. 12
(2022): 5923.
125.
Ozkahraman, H. Tarik, and Ali Bolatturk. "The use of tuff stone cladding in buildings for energy
conservation." Construction and Building Materials 20, no. 7 (2006): 435-440.
126.
Parkin, Ivan P., and Troy D. Manning. "Intelligent thermochromic windows." Journal of chemical
education 83, no. 3 (2006): 393.
127.
Liu, Yang, Andrew Caratenuto, Xuguang Zhang, Ying Mu, Youssef Jeyar, Mauro Antezza, and Yi
Zheng. "Ultrawhite structural starch film for sustainable cooling." Journal of Materials Chemistry A 13,
no. 15 (2025): 10792-10800.
128.
Yu, Jianhan, Hatem Alrawashdeh, and Mingshui Li. "Aerodynamic analysis of building with zigzagpatterned façade: Insights from large eddy simulation." Physics of Fluids 36, no. 2 (2024).
129.
Peretti, Clara, Angelo Zarrella, Michele De Carli, and Roberto Zecchin. "The design and
environmental evaluation of earth-to-air heat exchangers (EAHE). A literature review." Renewable and
Sustainable Energy Reviews 28 (2013): 107-116.
130.
Hazra, A., and M. Basu. "Economic analysis to implement distributed generation system in a railway rake maintenance depot." Renewable Energy 78 (2015): 157-164.
131.
Zhang, Tao, Minli Wang, Peihong Wang, Jiangqi Gu, Weidong Zheng, and Yihua Dong. "Bi-stage
stochastic model for optimal capacity and electric cooling ratio of CCHPs—A case study for a
hotel." Energy and Buildings 194 (2019): 113-122.
132.
Lim, Benson TH, and Martin Loosemore. "How socially responsible is construction business in
Australia and New Zealand?." Procedia Engineering 180 (2017): 531-540.
133.
Bass, Brad, and Bas Baskaran. "Evaluating rooftop and vertical gardens as an adaptation strategy
for urban areas." (2003).
134.
Lei, Jiawei, Jinglei Yang, and En-Hua Yang. "Energy performance of building envelopes integrated
with phase change materials for cooling load reduction in tropical Singapore." Applied energy 162 (2016):
207-217.
29
Mujtaba Rashid
RAC CEP
2021-ME-172
135.
Zinzi, M., and G. Fasano. "Properties and performance of advanced reflective paints to reduce the
cooling loads in buildings and mitigate the heat island effect in urban areas." International Journal of
Sustainable Energy 28, no. 1-3 (2009): 123-139.
136.
Yin, Rongxin, Peng Xu, and Pengyuan Shen. "Case study: Energy savings from solar window film
in two commercial buildings in Shanghai." Energy and Buildings 45 (2012): 132-140.
137.
Ozgener, Leyla, and Onder Ozgener. "Earth to Air Heat Exchangers (EAHE): Energy and Exergy
Efficiencies." In Encyclopedia of Energy Engineering and Technology-Four Volume Set (Print), pp. 415421. CRC Press, 2014.
138.
Zhang, Rong, Renzhi Li, Peng Xu, Wenhuan Zhong, Yifan Zhang, Zhenyang Luo, and Bo Xiang.
"Thermochromic smart window utilizing passive radiative cooling for self-adaptive
thermoregulation." Chemical Engineering Journal 471 (2023): 144527.
139.
Ahmed, M. M., Sally A. Ali, Dalia Tarek, Ibrahim M. Maafa, Ahmed Abutaleb, Ayman Yousef, and
Marwa Kamal Fahmy. "Development of bio-based lightweight and thermally insulated bricks: Efficient
energy performance, thermal comfort, and CO2 emission of residential buildings in hot arid
climates." Journal of Building Engineering 91 (2024): 109667.
140.
Raeissi, S., and M. Taheri. "Energy saving by proper tree plantation." Building and Environment 34,
no. 5 (1999): 565-570.
141.
Evans, Julian. Plantation forestry in the tropics: tree planting for industrial, social, environmental,
and agroforestry purposes. Oxford University Press, USA, 1992.
142.
Aba, S. C., O. O. Ndukwe, C. J. Amu, and K. P. Baiyeri. "The role of trees and plantation
agriculture in mitigating global climate change." African Journal of Food, Agriculture, Nutrition and
Development 17, no. 4 (2017): 12691-12707.
143.
McPherson, E. Gregory, and Rowan A. Rowntree. "Energy conservation potential of urban tree
planting." (2016).
144.
Anderson, Ray G., Josep G. Canadell, James T. Randerson, Robert B. Jackson, Bruce A. Hungate,
Dennis D. Baldocchi, George A. Ban-Weiss et al. "Biophysical considerations in forestry for climate
protection." Frontiers in Ecology and the Environment 9, no. 3 (2011): 174-182.
145.
Akbari, Hashem, Melvin Pomerantz, and Haider Taha. "Cool surfaces and shade trees to reduce
energy use and improve air quality in urban areas." Solar energy 70, no. 3 (2001): 295-310.
30