By: R.M. Chitranshi
ECBC
 With the background of high energy saving potential
and its benefits bridging the gap between demand and
supply, reducing environmental emissions through
energy saving and to effectively over come the barrier
the Govt. of India has enacted the Energy
Conservation Act, 2001.
 The Act provides the much needed legal framework
and institutional arrangement for embarking on an
energy efficiency drive.
 This includes Energy Conservation Building Code.
 The Act empowers Govt. of India and State
Governments to modify ECBC as per climatic
conditions of states.
 And to notify the code in Govt. gazette to make it
mandatory for commercial buildings having a
connected load of
 500 kW or maximum demand of 600 kVA or above or
 1000 sq. m of air conditioned area.
Purpose
 The purpose of this code is to provide
minimum requirements for energyefficient design and construction of
buildings.
Scope
 Minimum energy performance standards for design
and construction be prescribed.
 Applies to new construction and major renovation.
 Building components included
Building Envelope (Walls, Roofs, Windows)
Lighting
HVAC system
Service water heating and pumping
Electrical Systems (Power factor, Tramsformer)
Impact of ECBC – Energy
Savings
 Average energy use: For light and HVAC a typical class A office
building consumes 200kWh/sq m/Yr.
 Mandatory enforcement of ECBC is likely to reduce the energy
use by 30-40% to 120 – 160 200kWh/sq m/Yr.
 Energy saving as per BEE estimate – Saving of 1.7 billion kWh,
with national mandatory enforcement, in the first year it self.
Impact of ECBC Compliance
 Market Development for EE products.
 Building Insulation
 Energy Efficient Windows
 High efficiency HVAC systems
 Improved Design Practices.
 Lighting and Day Lighting
 Natural Ventilation/ Free cooling system
 Improved Building performance.
 Lower HVAC load.
 Lesser addition of power generation capacity.
Implementation Plan
Awareness and technical resources
Quick implementation guide.
Compliance resources.
Building Envelop
A well designed building envelop not
only help in complying with ECBC
code but can also result in first cost
saving by taking advantage of day
light and correct HVAC system sizing.
Definition of Commercial
Building
 According to energy information administration- Any
building that is used for neither residential,
manufacturing, nor agricultural purposes.
 Many types of commercial buildings Office Buildings
 Hotels
 Restaurants
 Retail malls and shops
 Hospitals
 Educational Institutes.
Importance of Energy Efficient
Envelope Design
 Helps in reducing heating/ cooling load.
 Helps in optimizing daylight.
 First cost and recurring savings.
 Helps in utilizing latest technological advances
 Simulation models greatly helps in designing high
performance envelops.
Energy Efficiency in Existing
Buildings/ facilities
 There is vast scope for energy efficiency improvement
in buildings/existing facilities.
 Energy Audit Studies have revealed a savings potential
to the extent of 40% in end use such as lighting,
cooling, ventilation, refrigerationetc.
 Audits identify the Energy baselines in existing
facilities along with Energy Efficiency Measures.
Energy Efficiency Measures
 Energy efficiency measures bring about energy savings due
to reduced energy consumptions.
 Energy savings are determined by comparing energy
baseline with energy consumed after implementation of EE
measures.
 Energy cost savings resulting from EE measures directly
benefit building owners and occupants over the life cycle of
the building.
Barriers to Energy Efficiency
 Lack of information about comparative energy use.
 Risk due to lack of confidence in performance of new
technologies.
 Higher cost of EE technologies.
 Asymmetry in sharing of costs and benefits.-especially
in building sector.
Case Study (I) - Energy Audit of Bapu Bhawan
Secretariat
ECO’s
Energy Savings
(Rs Lacs)
Estimated Investments
(Rs Lacs)
Simple Payback Period
(Months)
Short Term Measures
(with Payback Period upto 1 year)
Reactive Power Compensation and Power
Factor Improvement (9286 Kvah)
De-energization of Transformers
5.56
5.0
10-11
0.47
Nil
Immediate
Periodic Maintenance of AHU’s
1.12
Nominal
Immediate
Maintenance of the Chillers
3.52
2.0
6-7
Use of FRP Blades on the CT Fans
1.0
0.80
9-10
Replacement of High Efficiency Chilled and
Condenser Water pumps
6.16
6.0
11-12
Sub Total (A)
17.83
13.80
9-10
Long Term Measures
(with Payback Period above 1 year)
Controlling the Demand within Specified
Limits
Installation of Energy Efficient Lights
0.11
0.35
38-39
22.31
28.6
15-16
Sub Total (B)
22.42
28.95
15-16
Total (A+B)
40.25
42.75
12-13
Case Study (II) - Energy Audit of Shastri Bhawan
Secretariat
ECO’s
Energy Savings
Kwh/annum
Rs Lacs
Estimated
Investments
(Rs Lacs)
Simple
Payback
Period
(Months)
Short Term Measures with Payback Period upto 1 year
De-energization of Transformers
37431
1.87
Nil
Immediate
Optimization of Lighting Voltage
67950
3.39
Nil
Immediate
Periodic Maintenance of AHU’s
4639
0.23
Nominal
Immediate
Replacement of Condenser Water
Pumps (2 nos) with one New Pump
Sub Total (A)
30268
1.51
0.40
3-4
140288
7.00
0.40
< 1 month
Long Term Measures with Payback Period above 1 year
Installation of Energy Efficient Lights
157526
7.87
11.19
17-18
Use of FRP Blades on the CT Fans
3888
0.19
0.20
12-13
Replacement of Inefficient A/Cs with
Star Rated A/Cs
Installation of Solar Water Heating
System for the Canteen
Sub Total (B)
54432
2.72
6.6
29-30
2100
0.11
0.40
43-44
217946
10.89
18.39
20-21
Total (A+B)
358234
17.89
18.79
12-13
Helpful Tips to Architects and
Developers
 Select an organization/ consultant with expertise and
experience in performing building energy simulation.
 Always inquire for key input parameters and output
reports (e.g. thermal specifications of wall, glazing,
and roof elements, load and system summary reports.
 Ask simulation consultant to perform parametric
studies to evaluate:
 Relative cost and benefits of selecting key
components and technologies (glazing, lighting)
 Sizing of HVAC system.