SOCIALIST REPUBLIC OF VIETNAM
Independence - Freedom - Happiness
QCVN 09:2013/BXD
NATIONAL TECHNICAL
REGULATION ON ENERGY
EFFICIENCY BUILDINGS
Hanoi - 2013
Unofficial translation - QCVN 09: 2013/BXD
CONTENTS
INTRODUCTION ....................................................................................................................................... 3
I. GENERAL REQUIREMENTS .................................................................................................................... 4
1.1. Scope ................................................................................................................................................ 4
1.2. Coverage ........................................................................................................................................... 4
1.3. Normative references....................................................................................................................... 4
1.4. Terms, definitions and symbols........................................................................................................ 4
II. TECHNICAL REQUIREMENTS ................................................................................................................ 6
2.1.Building envelope .............................................................................................................................. 6
2.2.Ventilation and air conditioning ........................................................................................................ 9
2.3. Lighting ........................................................................................................................................... 15
2.4. Escalators and elevators ................................................................................................................. 18
2.5. Electric power consumption........................................................................................................... 18
2.6.Service water heating system ......................................................................................................... 20
III.MANAGEMENT REGULATIONS .......................................................................................................... 23
IV.IMPLEMENTATION ARRANGMENT ................................................................................................... 23
ANNEXES................................................................................................................................................ 24
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QCVN 09:2013/BXD
INTRODUCTION
QCVN 09:2013/BXD - “Energy Efficiency Building Code” was developed by the Vietnam Association of
Civil Engineering Environment, put forward by the Department of Science, Technology and
Environment Department, and enacted by the Ministry of Construction under Circular 15 /2013/TTBXD, dated on September 26, 2013. The National Energy Efficiency Building Code QCVN
09:2013/BXD shall supersede the Vietnam Energy Efficiency Building Code QCXDVN 09:2005 ratified
under the Minister of Construction’s Decision 40/2005/QĐ-BXD of November 17, 2005.
The National Energy Efficiency Building Code QCVN 09:2013/BXD was developed with research inputs
and contributions of international consultants from various external donors, including the
International Finance Corporation (IFC), the United States Agency for International Development
(USAID) and the Danish Energy Agency (the Kingdom of Denmark).
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Unofficial translation - QCVN 09: 2013/BXD
National Technical Regulation on Energy Efficiency Buildings
(NATIONAL TECHNICAL ENERGY EFFICIENCY BUILDING CODE)
I. GENERAL REQUIREMENTS
1.1. Scope
1.1.1 This National Technical Building Energy Efficiency Building Code provides mandatory technical
standards to achieve energy efficiency in the design, new construction or retrofit of civil buildings
(office buildings, hotels, hospitals, schools, commercial buildings,, services buildings, apartments
buildings, among others), with a gross floor area of 2,500 m2 or larger.
1.1.2 The requirements of this Code apply to:
1) The building envelope, except envelopes of non-air conditioned storage space or warehouses;
2) Equipment and systems in the building, including:
a) Interior lighting
b) Ventilation and air conditioning
c) Water heating
d) Energy management equipment, and
e) Elevators and escalators.
1.2. Coverage
This Code provides statutory technical requirements applicable to all entities and individuals involved
in activities pertaining to energy efficient buildings.
1.3. Normative references
1) ARI 340/360 – Performance rating of commercial and industrial unitary air-conditioning and heat
pump equipment.
2) ARI 365 – Performance rating of commercial and industrial unitary air-conditioning condensing
units.
3) ARI 550/590-2003 – Performance rating of water-chilling packages using the vapor compression
cycle.
4) ASHRAE 90.1-2001 – Standard 90.1-2001 (I-P Edition) -- Energy Standard for Buildings except
Low-Rise Residential Buildings (IESNA cosponsored; ANSI approved; Continuous Maintenance
Standard).
5) SHRAE 90.1-2004 – Energy Standard for Buildings except Low-Rise Residential Buildings.
6) DIN 4702-1 – Boilers for central heating; terms, requirements, testing, marking.
7) ISO 6946:2007 – Building components and building element - Thermal resistance and thermal
transmittance - Calculation method.
8) TCVN 298:2003 – Building components and parts – Thermal resistance and thermal conductivity
– Calculating methods.
9) TCVN 6307:1997 – Cooling systems – Testing methods.
10) TCVN 7830-1:2012 – Air conditioning equipment – Part 1: Energy efficiency.
1.4. Terms, definitions and symbols
1.4.1Terms and definitions
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1) Cooling air saving system: including ducts and automatic controlling system that allow fans to
drive cool air from outside into the building in appropriate weather conditions to reduce energy
consumption for air cooling or when mechanical air conditioning is not needed.
2) Building energy cost: total annual cost of energy consumption for the building.
3) Coefficient of performance (COP) – cooling: the ratio of the rate of heat removal to the rate of
energy input, in consistent units, to be verified based on existing national standards or
designated operating conditions. COP is used to rate the efficiency of electricity-powered
condenser air conditioner, including the compressor, evaporator coil and condenser coil. COP can
also be used to rate the efficiency of water-cooled chiller (not including chiller pumps, condensed
cooling water and cooling tower fans).
4) Coefficient of performance (COP) - heat pump: the ratio of the rate of heat output to the rate of
energy input, in consistent units, for a complete heat pump system under designated operating
conditions.
5) Overall thermal transfer value (OTTV): the total heat gain through the entire surface area of the
building envelope, including opaque walls and glazing by every square meter of the building
exterior surface area, W/m2.
6) Floor area of a particular space: the horizontal surface area of a specific space, measured from
the interior side of the circumference walls or partitions, at the elevation of the working plane
(0.8 m).
7) Radiation reduction coefficient of shading structures: the ratio of solar heat gain through
windows, in case a window external shading system is installed, to that of windows without
shading systems.
8) Overall heat transfer coefficient (Uo): the intensity of a time-constant heat flux going through a
surface area unit of the enclosing structure when the temperature difference of the air on both
sides of the structure is 1 K, measured in W/m2.K.
9) Total thermal resistance (Ro): the inverse of overall heat transfer coefficient Uo:Ro = 1/Uo,
measured in m2.K/W.
10) Lamp efficiency: the ratio of rated light output to power consumption, measured in lumen/W.
11) Efficiency of the ventilation-air conditioning systems: the ratio of output energy (useful energy at
the time of use) to input energy, in consistent unit, for a specific length of time, measured in %.
12) Enthalpy recovery: the ability to recover cooling energy of air conditioning equipment, boilers
etc., resulting in energy efficiency.
13) Annual energy consumption efficiency: the annual ratio of energy output to energy input of a
building or piece of equipment.
14) Indirectly air-conditioned space: an enclosed space in a building that is indirectly cooled (rather
than directly cooled) and allows heat transfer therefrom to adjacent air-cooled spaces.
15) Lighting power density (LPD): the ratio of electric lighting output to the illuminated area,
measured in W/m2.
16) Daylight relay: a device that automatically turns on or off input energy for electric lighting,
located near windows to maintain appropriate working illuminance level when direct or indirect
daylight fails to provide the desired illuminance.
17) Temperature control relay: an automatic temperature-sensitive device.
18) Building envelope: building envelope or building enclosure consists of opaque or transparent
walls, windows, doors, skylights, among others, that form enclosed spaces within a building.
1.4.2 Symbols, measurement units and acronyms
1) SHGC (Solar Heat Gain Coefficient): heat gain coefficient of glazing, published by manufacturers
or determined in accordance with prevailing standards, dimensionless. In case manufacturers
avails of the shading coefficient SC, SHGC = SC  0.87.
2) SC: Shading coefficient;
3) T: Absolute temperature, K;
4) RO: Total thermal resistance (inverse of heat transfer ratio Uo) of enclosing assembly – m2 K/W;
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5) Uo: Heat transfer coefficient (including heat transfer through ambient air layers on both sides of
the structure), W/m2 K;
6) Uo,M: Overall heat transfer coefficient of the roof assembly, W/m2 K;
7) Uo,T: Overall heat transfer coefficient of walls, W/m2 K;
8) AHU: Air handling unit;
9) ARI: Air-conditioning and Refrigeration Institute;
10) ASHRAE: American Society of Heating, Refrigerating and Air-Conditioning Engineers;
11) BEF: Ballast efficacy factor for fluorescent lamps, %/W;
12) BF: Ballast factor, %;
13) COPcooling: Air conditioner coefficient of performance – ratio of air cooling output to electricity
input, kW/kW;
14) COPheating: Heat pump coefficient of performance – ratio of heat gain to electricity input, kW/kW;
15) EER: Energy efficiency ratio of air conditioners – ratio of cooling output and electricity input,
kW/kW;
16) FCU: Fan coil unit – thermal exchange system consisting of multiple plain or fanned tubal rows;
thermal carriers being cooled or heated water running inside the tubes to provide
cooling/heating effects for a space; the FCU is the end-of-the-line component of a water-cooled
central air-conditioning system with chillers;
17) IEER: Integrated energy efficiency ratio, kW/kW;
18) IPLV: Integrated part load value, or in full term, integrated energy efficiency part load value;
kW/kW;
19) OTTVT: Overall thermal transfer value for walls – the mean intensity of the heat flux transferred
through 1 m2 of exterior walls, W/m2;
20) OTTVM: Overall thermal transfer value for roofs – the mean intensity of the heat flux transferred
through 1 m2 of roofing, W/m2;
21) PIC: Power input per capacity – the ratio of energy input, in kW, to cooling output, in RT (ton of
refrigeration), kW/RT;
22) VLT (Visible Light Transmission): the ratio of light passing through glazing materials, measured in
the amount of light energy that passes through glazing as a percentage of the light energy that
directs on the glazing surface, %;
23) VRV/VRF: Air conditioning systems with variable refrigerant volume/flow;
24) VSD: Variable speed driver;
25) WWR: Window-to-wall ratio, dimensionless;
II. TECHNICAL REQUIREMENTS
2.1.Building envelope
2.1.1 General requirements
The building envelope shall be designed and constructed in ways shall guarantee:
1) Natural ventilation whenever exterior climate conditions allow;
2) Sufficient insulation and minimum exposure to cold wind;
3) Sufficient day lighting under normal conditions, while reducing solar heat gain into the
building;
4) Choice of appropriate materials to improve energy efficiency for the building.
2.1.2 Requirements for building exterior walls and roofs
1) All ground exterior walls (opaque parts of the walls) shall maintain a maximum overall heat
transfer value Uo.max no greater than, or a minimum overall heat transfer value Ro.min no
smaller than the values specified in Table 2.1.
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Table 2.1. Thermal performance requirements for exterior walls
Areas
Wall orientation
Uo.max, W/m2.K
Ro.min, m2.K/W
All areas
All orientations
1.80
0.56
2) Requirements for flat roofs and roofs with gradient of less than 15 degrees:
All roofs, including those with insulation, metal roofs and others shall possess an overall heat
transfer value Uo no greater than, or total thermal resistance Ro no smaller than the values
specified in Table 2.2.
Table 2.2. Thermal performance requirements for flat roofs
Uo.max, W/m2.K
1.00
Area
All areas
Ro.min, m2.K/W
1.00
Notes:
1) Shaded roofs: If more than 90% of the roof is covered with a fixed
sunshade with ventilation, there is no need for insulation for such
roof. The sunshade must be installed at a minimum clearance of 0.3 m
from the roof surface to be recognized as having ventilation between
the roof and sunshade (double-layer roof with an air cushion in
between).
2) Flat roofs with reflective materials: Thermal resistance values Ro,min
provided in Table 2.2 may be multiplied by a coefficient of 0.80 for
roofs designed with reflective materials, within a range of 0.70 0.75,
to increase heat inflection for the exterior roof surface.
3) Roofs with gradient of 15 degrees or above: The minimum total
thermal resistance or maximum overall thermal transfer value for
roofs may be identified by multiplying Ro.min and Uo.maxvalues in Table
2.2 with a coefficient of 0.85 and 1.18, respectively.
3) Sizes of windows and skylight
a) The gross area of vertical openable and fixed windows shall guarantee good ventilation and
day lighting.
b) The overall thermal transfer value of walls and roofs shall guarantee:
- OTTVT for walls no greater than 60 W/m2;
- OTTVM for roofs no greater than 25 W/m2.
c) OTTV values are determined using prevailing standards and technical guidelines.
4) Glazed windows shall be designed with applicable SHGC coefficients in lieu of the OTTVT
referred to in 2.1.2 – 3) – b) above. SHGC of glazing shall be smaller or equal to the maximum
allowed value, and glazing VLT shall not be lower than the VLTmin in Table 2.3.
Table 2.3. WWR-related SHGC for glazing
SHGCmax on 8 main orientations
WWR, %
20
N
E or W
0.90
0.80
NE, NW or SE,
SW
0.86
S
VLTmin
0.90
0.70
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Unofficial translation - QCVN 09: 2013/BXD
30
0.64
0.58
0.63
0.70
0.70
40
0.50
0.46
0.49
0.56
0.60
50
0.40
0.38
0.40
0.45
0.55
60
0.33
0.32
0.34
0.39
0.50
70
0.27
0.27
0.29
0.33
0.45
80
0.23
0.23
0.25
0.28
0.40
90
0.20
0.20
0.21
0.25
0.35
100
0.17
0.18
0.19
0.22
0.30
Notes:
1) If WWR does not match the values in column 1, Table 2.3, SHGC shall be determined through
linear interpolation using the nearest higher and lower WWR values.
2) Glazing materials with SHGC values higher than the reference SHGC providing that sunshades
with appropriate A coefficients are used to insure that the selected SHGC is smaller or equal to
the reference SHGC multiplied by the A coefficient – see 2.1.2 – 5).
5) In case of building facades being installed with sunshades, SHGC values in Table 2.3 may be
adjusted by multiplying them with the A coefficients in Tables 2.4 and 2.5.
Table 2.4. A coefficient for consistent horizontal sunshades placed on or above the upper window
edge by a clearance d, with d/H < 0.1
R=b/H
N
1.23
1.43
1.56
1.64
1.69
1.75
1.79
1.82
1.85
1.85
On walls, facing 8 main orientations
NE or NW
E or W
SE or SW
1.11
1.09
1.14
1.23
1.19
1.28
1.35
1.30
1.45
1.47
1.41
1.59
1.59
1.54
1.75
1.69
1.64
1.89
1.82
1.75
2.00
1.89
1.85
2.13
2.00
1.96
2.22
2.08
2.08
2.27
S
1.20
1.39
1.39
1.39
1.39
1.39
1.39
1.39
1.39
1.39
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
Notes:
1) Dimensions:
b – reach of sunshade;
H – window height;
d – clearance from upper window edge to lower sunshade contact;
b, d and H share the same dimension for length.
2) Applicable for sunshades placed above the upper window edge by a clearance d, with d/H ≤ 0.1 –
tolerance of less than 10%.
Table 2.5. A coefficient for consistent vertical sunshades placed on or next to a window side by a
clearance e, with e/B < 0.1
R=b/B
0.10
0.20
0.30
8
N
1.25
1.52
1.75
On walls, facing 8 main orientations
NE or NW
E or W
SE or SW
1.06
1.01
1.09
1.12
1.03
1.19
1.19
1.05
1.32
S
1.11
1.19
1.22
QCVN 09:2013/BXD
0.40
1.82
1.28
1.06
1.45
1.25
0.50
1.85
1.37
1.09
1.64
1.28
0.60
1.85
1.47
1.10
1.82
1.30
0.70
1.89
1.59
1.12
1.96
1.30
0.80
1.89
1.69
1.14
2.13
1.30
0.90
1.89
1.82
1.16
2.22
1.30
1.00
1.89
1.96
1.18
2.33
1.30
Notes:
1) Dimensions:
b – reach of vertical sunshade;
B – window width;
e – clearance from window side to vertical sunshade inner contact;
b, e and B share the same dimension for length.
2) Applicable also for vertical sunshades placed by a clearance e from the window side, with e/B ≤
0.1, tolerance of less than 10%.
2.2.Ventilation and air conditioning
2.2.1 General requirements
1) Natural ventilation and mechanical ventilation
For every specific space, natural (passive) ventilation systems or coerced (active – mechanical)
ventilation systems may be used. Natural ventilation systems used shall meet the requirements of
2.2.1 – 2).
2) Natural ventilating system
Spaces are considered naturally ventilated if the following requirements are met:
a) Vent holes and windows may be opened outward with sizes no less than 5% of the floor area.
Users may easily get access to these ventilation openings.
b) There are vent holes that may be opened on the roofs or walls that face the external oncoming wind sources. The ventilation openings have ventilating sizes of no less than 5% of
the floor area. Users may easily get access to these vent holes which connect to the external
air through openings with similar or larger sizes.
c) The accumulated size of the vent openings is no smaller than the gross area of the wind
catchers.
3) Mechanical ventilating system
Spaces without natural ventilation shall be installed with mechanical ventilating systems to provide
external air to every frequently occupied area through anair distribution piping system.
2.2.2 Requirements for ventilation-air conditioning systems and equipment
1) General requirements
a) Equipment performance: air conditioning and water cooling equipment and systems shall
ensure the minimum coefficients of performance (COP) in standard rating conditions, and
not lower than the values provided in the following tables.
- Table 2.6: for electric air conditioners and condenser coils;
- Table 2.7: for water cooling equipment;
- Table 2.8a: for cooling towers;
- Table 2.8b: for condenser units.
Notes:
Apart from the cooling coefficient of performance (COP), refrigeration equipment is also reviewed for
energy efficiency through the integrated part load value (IPLV) and integrated energy efficiency ratio
(IEER).
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Unofficial translation - QCVN 09: 2013/BXD
b) Automatic timer: the following equipment must come with a timer or other control devices
that may automatically turn the equipment on or off as set up.
- Chillers;
- Hot air systems;
- Cooling tower fans;
- Pumps with capacity equal or greater than 5 HPs (3.7 kW).
c) Piping insulation of cooling systems:
Coolant ducts of air conditioning systems and chilled water piping of central air conditioning
systems shall be affixed with a thermal insulating layer with thickness equal or greater than the
insulation thickness values specified in Tables 2.9 and 2.10.
The insulating thickness (mm) provided in Tables 2.9 and 2.10 apply to thermal insulating
materials with heat conductivity of 0.032÷0.04 W/m.K at a mean temperature of 24C. The
minimum insulation thickness increases for materials with heat conductivity greater than 0.04
W/m.K or may decrease for materials with thermal conductivity lower than 0.032 W/m.K.
For insulating materials with conductivity outside the above mentioned range, the minimum
thickness (bmin) is determined using the following formula:
b


bmin  r (1  0 ) / 0.04  1
r


where,
bmin
r
b0
λ
(2.1)
minimum thickness of the insulating layer, mm;
actual duct external radius, mm;
the thickness of the insulating layer listed in Tables 5.4, 5.5 and 5.6, with applicable
piping sizes,mm;
thermal conductivity coefficient of replacement materials at the liquid applicable
temperatures, W/m.K.
d) Inlet and outlet air duct system insulation: inlet and outlet air ducts shall be affixed with an
insulating layer with thickness equal or greater than the thickness values specified in Table
2.11. No insulation is required for air exhausts.
e) Testing and calibration: fans or pumps with capacity of 5 HPs (3.7kW) or higher shall have
their designed flows calibrated in by calibrating speeds using multi-speed drives, twin-speed
drives or variable speed drives (VSDs). Adjustment of fan and pump flow using flowregulating valves shall be restricted.
f) Cooling tower fan control: heat extraction towers with fan motors of 5 HPs (3.7 kW) or
higher shall be equipped with multi-speed drives, twin-speed drives or variable speed drives
(VSDs).
g) Water cooling chiller system: water-cooled air conditioning systems shall be designed with
variable flow rates using pumps with variable speed drives.
h) Buildings with central air conditioning must be equipped with enthalpy recovery systems.
Equipment energy recovery efficiency shall be no smaller than 50%.
2) Supplementary requirements for mechanical ventilating and air conditioning systems
To be qualified, mechanical ventilating and air conditioning systems shall meet the following
additional requirements.
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QCVN 09:2013/BXD
a) CO2 sensor: installed to increase the inlet air flow for standard zones with design area of less
than 3 m2/occupant.
b) Automatic timer: intermittent ventilating fans shall be equipped with timers or automatic
controls that are able to set their own on/off and operational timings.
c) Piping welding and joining: inlet and circulating air ducts shall meet the requirements for
joining air and fluid piping in line with existing regulations.
Table 2.6. Coefficient of performance for direct electric air conditioners
Type of equipment
Unitary air-conditioner
Split air-conditioner
Cooling output
-
Min COP of air
conditioners.
kW/kW
2.30
<4.5 kW
2.60
 4.5 kW and < 7.0 kW
 7.0 kW and < 14.0
kW
2.50
2.93
 19 kW and < 40 kW
 40 kW and < 70 kW
 70 kW and < 117 kW
 117 kW
<19 kW
19 kW and <40 kW
 40 kW and < 70 kW
3.02
2.84
2.78
2.70
3.35
3.37
3.32
 70 kW
2.70
Air-cooled condenser
units
 40 kW
2.96
Water-cooled or
evaporating condenser
units
 40 kW
Water-cooled and
evaporating airconditioner
TCVN 7830:2012
and
TCVN 6307:1997
2.40
14.0 kW and < 19 kW
Air-cooled airconditioner
Test procedures
TCVN 6307:1997
or
ARI 210/240
ARI 340/360
ARI 210/240
ARI 340/360
ARI 365
3.84
ARI 365
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Unofficial translation - QCVN 09: 2013/BXD
Notes:
1) Coefficient of performance of air-conditioners: COP = refrigerant output/power input (kW/ kW);
2) Condenser units, including the compressor and condenser coils;
3) Minimum coefficients of performance listed in the Table are calculated at 100% of refrigerant
output. To calculate the coefficient of performance for AC units running for one year, ARI 340/360 uses
the following equation:
IEER = 0.020A + 0.617B + 0.238C + 0.125D (W/W)
where,
IEER – Integrated energy efficiency ratio: coefficient of performance of AC units running for one
year at various loads.
A = EER –coefficient of performance of the AC unit (W/W) at full load;
B = EER – coefficient of performance of the AC unit (W/W) at 75% load;
C = EER – coefficient of performance of the AC unit (W/W) at 50% load;
D = EER – coefficient of performance of the AC unit (W/W) at 25% load.
Table 2.7. Coefficient of performance for chillers
Cooling output (kW)
Chiller
coefficient of
performance.
COPMIN. kW/kW
Air-cooled chiller, electric
Attached or separated
condenser
All capacities
3.10
1.133
-
Reciprocating water-cooled
chiller, electric
All capacities
4.20
0.836
-
< 528
≥ 528 and < 1055
≥ 1055
< 528
≥ 528 and < 1055
≥ 1055
4.45
4.90
5.50
5.00
5.55
6.10
0.789
0.717
0.639
0.702
0.633
0.576
-
Type of equipment
Water-cooled rotary
screw/scroll chiller, electric
Centrifugal water-cooled
chiller, electric
Input energy
consumption
PICMAX. kW/RT
Electricity
Heat
Air-cooled absorption
chiller,
All capacities
0.60 (*)
5.860
single effect
Water-cooled absorption
All capacities
0.70 (*)
5.022
chiller, double effects
Absorber chiller, double
All capacities
1.00 (*)
3.516
effects, indirectly fired
Absorber chiller, double
All capacities
1.00 (*)
3.516
effects, directly fired
Notes:
1) Source: ASHRAE Standard 90,1-2001; ASHRAE Standard 90,1-2004;
2) (*) For absorption chillers, COP = Cooling output/Heat input;
- Power input consumption: PIC = electricity input/cooling output in RT;
- Refrigerant Ton (RT):1RT = 3.516 kW = 12000 Btu/h;
3) To calculate the coefficient of performance for chillers operating in one year, ARI 550/590-2003
provides the following equation:
IPLV = 0.01A + 0.42B + 0.45C + 0.12D (kW/kW)
where,
IEER – Integrated energy efficiency ratio: coefficient of performance of cooling equipment for
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the accumulated operational time in one year on various loads.
A –COP (kW/kW) at full load;
B –COP (kW/kW) at 75% load;
C –COP (kW/kW) at 50% load;
D –COP (kW/kW) at 25% load.
Table 2.8a. Performance specifications for cooling towers
Cooling
Type of
output
equipment
range
Cooling
tower with
draft fans
and
centrifugal
fans
Rated specifications
Rating criteria
Input water
temperature:370C
Output water
All
temperature:
capacities
320C
Moist air
temperature:270C
Water flow Supplementary
throughput
water flow
13
l/minute,
Tc
Test
procedure
Fan
output
1.0  1.4 %
Water flow
through
condenser
35  40
W/Tc
CTI
Notes:
1) CTI – Cooling Technology Institute;
2) Tc: condenser ton; Tc = RT  1.25 = 3.516  1.25 = 4.395 Kw.
Table 2.8b. Required specifications for condenser units
Rated specifications
Type of
equipment
Cooling
output
range
Rating
criteria
Air-cooled
condenser
units, with
compressor
0.5500
RT
Input air
temperature:
350C
Water-cooled
101600
condenser units RT
Input water
temperature:
29.40C
Output water
temperature:
350C
Wind flow
Fan
Compressor
1734
m3/minute
RT
75150
W/RT
1.01.3
kW/RT
Test
procedure
CTC
Water flow
9.08 11.40 l/minute RT
CTC
Notes:
CTC – Cooling towers and condensers
HVAC Equations, Data and Rules of Thumb, 2008, USA.
Table 2.9. Thickness of insulation for copper refrigerant conduits
Copper conduit
diameter, mm
2
Air conditioned space
Applicable conditions: t=26 ±2oC, φ= 60%
Refrigerant temperature oC
-18
-30
13
Unofficial translation - QCVN 09: 2013/BXD
6÷16
19÷25
34÷54
66÷80
105
9
9
9
13
-
Copper conduit
diameter
mm
2
6÷16
19÷25
34÷54
66÷80
105
25
32
32
32
-
Insulation thickness, mm
19
19
19
19
Non-air conditioned space
Applicable conditions: t =26÷32 oC, φ = 85%
Refrigerant temperature oC
-18
Insulation thickness, mm
38
50
50
50
Applicable conditions: t = 32÷37 oC, φ = 60%
Refrigerant temperature oC
-18
Insulation thickness, mm
38
50
50
57
-
19
19
25
25
25
-30
50
50
57
64
70
Copper conduit
2
-30
diameter
mm
6÷16
25
50
19÷25
32
50
34÷54
32
64
66÷80
32
70
105
76
Notes:
1) t – Exterior air temperature, oC;
2) The above insulation thickness applies to copper refrigerant (fluid, gas) conduits;
3) The thickness of the insulation (mm) given in the Table apply to insulating materials with thermal
conductivity λ within a range of 0.032 ÷ 0.04 W/m.K at an average temperature of 24C. The
minimum thickness of the insulating layer shall increase with materials having thermal conductivity
higher than 0.04 W/m.K or decrease with materials having thermal conductivity less than 0.032
W/m.K and is adjusted using equation (5.1).
Table 2.10. Thickness of insulation for cooled water conduits
Steel pipe diameter, mm
20÷50
50÷75
75÷150
150÷250
250÷600
Steel pipe diameter, mm
14
Air conditioned space
Applicable conditions: t=26 ±2oC, φ= 60%
Cooled water temperature,oC
7÷12
Insulation thickness, mm
16
16
19
19
25
Non-air conditioned space
Applicable conditions: t =26÷37oC, φ = 85%
Cooled water temperature,oC
7÷12
QCVN 09:2013/BXD
Insulation thickness, mm
20÷50
25
50÷75
25
75÷150
30
150÷250
30
250÷600
38
Notes:
1) For steel pipes with diameters listed in the table being rated diameters (IPS - Iron pipe
standard);
2) The insulation thickness of steel pipes may apply also to PE, PPR and PN16 plastic pipes. In case
of PE and PPR plastic pipes, the diameter values listed in the Table are outside diameters.
3) The thickness of the insulating layer (mm) given in Table 5.5 apply to insulating materials with
thermal conductivity λ within a range of 0.032 ÷ 0.04 W/m.K at an average temperature of
24C. The minimum thickness of the insulating layer shall increase with materials having
thermal conductivity higher than 0.04 W/m.K or decrease with materials having thermal
conductivity less than 0.032 W/m.K and is adjusted using equation (2.1).
Table 2.11. Thickness of insulation for air ducts
Air conditioned space
Applicable conditions: t=26 ±2oC, φ= 60%
Cooled air temperature, oC
12÷16
Insulation thickness, mm
15
Non-air conditioned space
Applicable conditions: t =26÷37 oC, φ = 85%
Cooled air temperature, oC
12÷16
Insulation thickness, mm
20
Notes:
The thickness of insulation (mm) given in the Table apply to porous polymer, close-compartment
structured insulating materials with thermal conductivity λ within a range of 0.032 ÷ 0.04 W/m.K at
a mean temperature of 24C. The minimum thickness of insulation shall increase with materials
having thermal conductivity higher than 0.04 W/m.K or decrease with materials having thermal
conductivity less than 0.032 W/m.K and is adjusted using equation (2.1).
2.3. Lighting
2.3.1 General provision
1) Scope
This section provides limits for the maximum allowable lighting output needed for the building
lighting system as well as limits on the acceptable performance of commonly used lighting
components (lamps and ballasts) and lighting control systems. The following categories do not fall
under the requirements of this section:
a) Lighting designed for theatrical performance, television shows, different parts of recreation
facilities, including hotel ballrooms, dance clubs, and areas where lighting is a vital technical
part of the show functions;
b) Specialized medical lighting;
c) Special lighting for research laboratories;
d) Safety lighting that automatically switches on and off during operation;
e) Lighting in special security zones as required by the law or local governments;
f) Safety or security zones for humans that need auxiliary lighting.
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2) Minimum illuminance
The minimum illuminance (lux) for functional spaces shall meet the requirements of prevailing
technical standards.
3) Maximum lighting power density
a) The mean lighting power density (LDP) of an entire building shall not exceed the maximum
allowed limits listed in Table 2.12. The mean lighting power density of a building equals the
total lighting output of the building divided by the total occupied area.
Table 2.12. Mandatory requirements for lighting power density (LPD)
LPD (W/m2)
Type of building
Offices
11
Hotels
11
Hospitals
13
Schools
13
Commercial and services buildings
16
Apartments
8
Enclosed, in-house, basement car parks
3
Outdoor or open (roofed only) car parks
1.6
b) Other types of buildings with sizes subject to the restrictions of this Code but not listed in
Table 2.12 above may apply maximum values of lighting power density of up to 13 W/m 2.
c) For mixed-use buildings with sizes subject to the restrictions of this Code and various
different functional areas, the functional use of each area shall be accounted for, with each
of the areas complying with the maximum lighting power density values listed in Table 2.12
above.
d) The mean lighting power density for parking lots is calculated by dividing the total lighting
power by the gross area of the parking lot.
2.3.2 Requirements on lighting equipment performance
1) Minimum lamp performance is defined in Tables 2.13 and 2.14.
Table 2.13. Minimum illuminating performance of linear fluorescent lamps
Rated lamp power, W
14-20
20-40
Rated illumination efficiency, lm/W
72
78
Table 2.14. Minimum illuminating performance of compact fluorescent lamps
Rated lamp power, W
5-8
16
Rated illumination performance, lm/W
55
QCVN 09:2013/BXD
9-14
15-24
25-60
60
65
70
2) Ballast efficacy values are listed in Table 2.15.
Table 2.15. Electronic ballast efficacy
Nominal output, W
18
20
22
30
32
36
40
Ballast efficacy factor (BEF), %/W
5.518
5.049
4.619
3.281
3.043
2.681
2.473
2.3.3 Lighting controls
1) Lighting controls for different building spaces
Every space enclosed with ceiling-height partitions is a separate space that needs at least one lighting
control device. Each of these lighting control devices shall be actuated manually or by automatic
sensors for occupants in such space. Each control device must:
a) Cover a maximum floor area of 100 m2
b) The spaces specified in Table 2.16 shall to be installed with occupancy sensors, which directly
connect to and control the lighting system. Occupancy sensors controlling lamps shall not be
connected to the exit lighting and security lighting systems.
Table 2.16. Buildings for which occupancy sensors are required
Type of building
Application
Offices
Mandatory
Hotels
Mandatory
Hospitals
Schools
Conference rooms and
passageways
Conference rooms and
passageways
Optional
Mandatory
In-house parking lots and
passageways
Commercial and services
buildings
Apartments
To be used in
Optional
Mandatory
Passageways and in-house parking
lots
d) For parking lots, at least 70% of the lighting system shall be controlled through occupancy
sensors (proportion of the system in terms of lighting consumption power).
2) Controls for day-lit areas
Artificial lighting designs for day-lit enclosed spaces need to take into account the following
considerations:
a) Potentially day-lit areas are spaces parallel to windows/exterior glazing within a distance
from the window/exterior glazing of up to 1.5 times the height from the floor to the tip of
the window glass area or exterior glazing.
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b) All lighting equipment in potentially day-lit areas may be installed with lighting control
devices in ways that allow:
- Automatic photosensor to be used to control lamp dimming or turn lamps on and off
depending on the level of natural illuminance received. Photosensor shall be positioned at
half the depth of potentially day-lit areas. When natural light measured by the sensors at
beyond the standard preset level for the occupant space (e.g. 300 lux for offices), the sensors
should trigger lamp switch-off.
- Stand-alone lamps to be turned on at potentially day-lit areas independently from the public
lighting system.
c) In respect of the design for areas using concurrently occupancy sensors and photosensors,
the occupancy sensors shall be prioritized over photosensors for lighting control.
d) Hospitals, apartment buildings and hotel rooms are not mandatorily required to apply the
requirements of 2.3.3.
e) Spaces designed for special uses are exempted from the requirements of 2.3.3 – 2), providing
that the designer presents detailed justification.
3) Auxiliary lighting controls
Auxiliary controls for light on/off switching installed in fixed positions underneath decks, shelves,
cabinets and so on shall be used in the following events:
a) Lighting for hotel, guesthouse rooms and luxurious guestrooms;
b) Display lighting in shops or for demonstration.
2.4. Escalators and elevators
2.4.1 Escalators
Escalators must be fitted with controls to reduce speed or to stop when no traffic is detected.
Escalators shall be designed with energy savings features as described below:
1) Reduced speed control: the escalator shall change to a slower speed when no activity has
been detected for a period of a maximum of three minutes. Detection shall be by photocell
activation at the top and bottom landing areas.
2) Use on demand: the escalator shall shut down when no activity has been detected for a
period of a maximum of fifteen minutes. Use on demand escalators must be designed with
energy efficient soft start technology. The escalator shall start automatically when required.
The activation shall be by photocells installed in the top and bottom landing areas.
2.4.2 Elevators (lifts)
Elevators (lifts) must be provided with controls to reduce the energy demand. To meet this
requirement, the following features must be incorporated in traction drive elevators:
1) Use of AC Variable-Voltage and Variable-Frequency drives on non-hydraulic elevators.
2) The lift car uses energy-efficient lighting and display lighting i.e. an average lamp efficacy,
across all fittings in the car, of >55 lamp lumens/circuit watt and lighting switches off after
the lift has been inactive for a maximum period of five minutes.
3) Elevators shall operate in a stand-by condition during off-peak periods. For example, the
power side of the lift controller and other operating equipment such as lift car lighting, user
displays and ventilation fans switch off when the lift has been inactive for a maximum period
of five minutes.
2.5. Electric power consumption
2.5.1 Electrical distribution system
1) Measurement
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QCVN 09:2013/BXD
Building electrical distribution system shall be equipped with attached metering instruments to
record energy demand (kVA), power consumption (kWh), and total loads on electricity meters.
Electrical distribution systems in buildings shall be designed so that energy consumption at end-use
loads can be check-metered. Check-metering is required for load facilities with total installed power
consumption of over 100 kVA, including lighting and socket outlets, air conditioning system,
ventilation, hot water system and other load centers of over 100 kVA.
2) Submetering
Sub-metering for each tenant and a provision to permit check-metering the tenant load shall be in
place.
Notes: Shared (central) air-conditioning systems need not meet these tenant check-metering
requirements.
3) Power factor correction
All 3-phase electricity supplies exceeding 100 A shall maintain a power factor between 0.90 lag and
unity at the point of connection.
4) Adjustment of installed power
Electrical systems in a building shall be estimated, designed and operated to provide the maximum
concurrent load factor possible as specified in Table 2.17 and the highest allowed installed power as
specified in Table 2.18.
Table 2.17. Maximum concurrent load factor ks, by points of use
End-use load
Lighting
Socket outlets
Air conditioning, ventilation
Hot water system
Other major load centers
Entire building
Concurrent load factor ks
0.9
0.4
0.9
0.9
0.9
0.8
Table 2.18. Maximum allowed installed power
Installed power, W/m2
70
80
75
65
65
Type of building
Upscale apartment buildings
Hotels
Offices, public use buildings
Commercial, service, public service buildings
Schools, hospitals
2.5.2 Electric motors
All permanently wired 3-phase induction motors that are used in the building shall have a nominal
full-load motor efficacy of no less than the values required in Table 2.19. The manufacturer’s labels
on the motors must provide minimum efficacy, nominal efficacy and outputs at full load.
Table 2.19. Minimum efficacy for electric motors
Motor output, kW
kW
Required efficacy, %
2-pole
4-pole
19
Unofficial translation - QCVN 09: 2013/BXD
1.1
82.2
83.8
1.5
84.1
85.0
2.2
85.6
86.4
3.0
86.7
87.4
4.0
87.6
88.3
5.5
88.5
89.2
7.5
89.5
90.1
11.0
90.6
91.0
15.0
91.3
91.8
18.5
91.8
92.2
22.0
92.2
92.6
30.0
92.9
93.2
37.0
93.3
93.6
45.0
93.7
93.9
55.0
94.0
94.2
75.0
90.0
94.6
95.3
94.7
95.1
110.0
95.4
95.6
132.0
95.5
95.7
160.0
95.8
95.8
200.0
96.1
95.9
250.0
96.2
96.1
280.0
96.3
96.4
315.0
96.4
96.5
355.0
96.5
96.6
400.0
96.7
96.7
450.0
96.7
96.8
500.0
96.8
96.9
560.0
96.9
97.0
630.0
96.9
97.1
Notes: Motors with outputs in between two numbers shall adopt
the higher efficacy value.
2.6.Service water heating system
2.6.1 General requirements
Designed loads for service water heating systems shall be calculated based on system sizing and
follow the manufacturers’ recommendations.
In case other (non-resistance) service water heating solutions of higher efficiency are available,
resistance-based service water heating systems shall not be allowed.
20
QCVN 09:2013/BXD
Buildings in need of high, concentrated service water heating with installation input of over 50 kW or
power consumption of over 50,000 kWh/year are not allowed to use resistance-based service water
heating solutions.
Order of priority for civil buildings:
1) Temperature range ≤60oC
a) Service water heating using heat recovery air conditioning;
b) Service water heating using solar power combined with heat pumps/electric heaters;
c) Service water heating using heat pumps;
d) Service water heating using gas water heaters;
e) Service water heating using electric heaters for buildings with less than 25 rooms.
2) Temperature range ≥ 115oC (cooking, washing, disinfection, sauna)
For buildings in concurrent needs of hot water of ≤ 600C (for household uses) and hot water/steam of
≥1150C (for cooking, laundering, sauna and disinfection), priorities shall be given to water heating up
to 600C, before further heating the water or steam up to ≥1150C using gas or fuel oil-fired heaters.
2.6.2 Water heating equipment efficacy
All water heating and supply equipment used internally for heating potable water, keeping warm,
hot swimming pool and hot water storage tanks shall meet the requirements listed in Table 2.20. For
heat pump water heaters, refer to Table 2.21.
Table 2.20.Minimum efficacy for water heating equipment
Equipment type
Minimum efficiency ET, %
1. Gas-fired storage water heaters
78
2. Gas-fired instantaneous water heaters
78
3. Gas-fired hot water supply boilers
77
4. Fuel oil-fired hot water heaters and supply systems
80
5. Duel fuel gas/oil-fired hot water supply boilers
80
6. Firewood/paper-fired boiler of 10÷350 kW output
60*)
7. Boilers of 10÷2000 kW, burnt with molded brown coal
70*)
8.Pitcoal-fired boilers of 10÷2000 kW
73*)
Notes:
1. The minimum efficiency for oil or gas-fired water heaters is given in terms of Thermal efficiency
(ET), which includes thermal losses from the heater shell.
2. *) According to DIN 4702 – Part 1 (DIN – German standards).
Efficacy for electric resistance-based water heaters in particular is given in terms of maximum
Standby loss (SL), where a 40°C temperature difference between stored water and ambient
requirements exists, and is determined using the equation:
Emin = 5.9 + 5.3V0.5, W
(2.2)
Where
-V is volume in liters.
Table 2.21. Minimum coefficient of performance - COP for water heating heat pumps
Equipment type
Air-heated heat pumps
Water-heated heat pumps
Heat recovery air conditioners
COP, kW/kW
≥ 3.0
≥ 3.5
21
Unofficial translation - QCVN 09: 2013/BXD
-
Hot water supply only
Air conditioning and hot water supply
≥ 3.0
≥ 5.5
Electric resistance-based water heating equipment is not recommended except for supporting solar
power systems. Electric heat pump water heating equipment with higher energy efficiency than
electric resistance-based water heaters is recommended.
Where eligible, solar powered service water heating systems may be used to meet all or part of
water heating needs for the building. Solar powered water heaters shall have at least 60% efficacy
and minimum thermal insulation R of 2.2 m2.K/W at the back of the solar panels.
2.6.3 Service water heating piping insulation
The following hot water piping shall be insulated.
1) Steam piping serving such needs as laundry, cooking etc.
2) Hot water piping for bath, keeping warm, cooking etc.
The insulation thickness of the piping shall be equal or greater than the insulation thicknesses listed
in Tables 2.22 and 2.23.
Table 2.22. Insulation thickness for hot water steel piping
Air temperature; t = 5 37oC
Hot water temperature (oC)
Pipe size
≥ 115
mm
50÷90
Insulation thickness (mm)
20÷50
50
20
65÷80
50
20
90÷150
63
25
200÷250
63
25
Notes:
1. Insulating materials shall have conductivity of 0.06 ÷ 0.07 W/m.K, applicable to 115oC.
2. Closed particle structured, porous polymer insulating materials with thermal conductivity λ of
0.032 ÷ 0.04 W/m.K adopt the temperature range of 5090oC.
3. The insulation thicknesses in Table 2.22 shall ensure that the exterior temperature is lower
than 43oC.
4. For insulating materials with conductivity outside the above mentioned range, the minimum
thickness (bmin) is determined using equation (2.1).
Table 2.23. Insulation thickness for PPR, PE hot water piping
Outer diameter of PN20/ PN25 plastic pipes
Conductivity 0.2 W/mK
mm
20  50
22
Air temperature; t = 5 37oC
Hot water temperature (oC)
50÷90
16
QCVN 09:2013/BXD
65
19
25
80  125
Notes:
1) For residential buildings, insulation may be optional for PPR hot piping.
2) Insulating materials shall maintain conductivity of 0.034 ÷ 0.04 W/m.K.
3) For insulating materials with conductivity outside the above mentioned range, the minimum
thickness (bmin) is determined using formula (2.1).
2.6.4 Service water heating system controls
1) Temperature controls shall be provided to limit point-of-use water temperatures not to
exceed 50°C.
2) Temperature controls shall be provided to limit the maximum temperature of water
delivered to wash basin faucets in public restrooms up to 43°C.
3) Systems designed to maintain usage temperatures in hot water pipes shall be equipped with
automatic ON/OFF switches that can be set to maintain desirable temperatures for
recirculating hot water.
4) Recirculating pumps used to maintain storage tank water temperatures shall be controlled in
ways to operate in harmony with the operating mode of the service water supply system.
III.MANAGEMENT REGULATIONS
3.1. Design documentations of newly developed, reconditioned and retrofitted buildings with sizes
subject to the scope of QCVN 09:2013/BXD shall include a narrative demonstration of compliance
with the requirements of this Code.
3.2. Review and assessment of building designs shall be done in accordance with prevailing rules,
including verification of compliance with the requirements of QCVN 09:2013/BXD for buildings that
fall under the scope of this Code.
IV.IMPLEMENTATION ARRANGMENT
4.1. The Department of Science,-Technology and Environment (Ministry of Construction) is
responsible for popularizing and providing the implementation guidelines for QCVN 09:2013/BXD to
interested parties.
4.2. Local regulators shall monitor compliance with the requirements of QCVN 09:2013/BXD for
building design and construction works taking place in their jurisdictions and in accordance with the
existing laws.
4.3. Any concerns that may arise during the adoption of this Code may be relayed to the Department
of Science, Technology and Environment (Ministry of Construction) for guidance and responses.
23
Unofficial translation - QCVN 09: 2013/BXD
ANNEXES
(For reference)
PHYSICAL SPECIFICATIONS OF MATERIALS, COMPOSITION AND THERMAL RESISTANCE
CALCULATION FOR ENCLOSING ASSEMBLIES
1. Equation for the calculation of thermal resistance and overall heat transfer coefficient (U-value)
of enclosing assembly
Ro 
n
b
1
1
 ∑ i  Ra 
hN 1 i
hT , m2.K/W (1)
where:
hN , hT – respectively, the heat transfer coefficients of outer and inner surfaces of building
envelope, W/m2.K ;
bi - thickness of ith material layer, m;
i - thermal conductivity of the ith material layer of the enclosing assembly, W/m.K;
n - number of material layers in the enclosing assembly;
Ra - thermal resistance of the air layer inside the enclosing assembly, if any, m2.K/W .
Uo 
1
Ro , W/m2.K
(2)
where:
Thermal conductivity I listed in Table 1.
See Table 3 for hN and hT.
See Table 4 for the thermal resistance of air layer Ra.
2. Key parameters needed for building envelope calculations
Table 1. Physical specifications of building materials
Name of materials
Asbestos-cement boards and panels
Asbestos-cement insulating boards
Asbestos-cement insulating boards
Steel-net cement roof tile
Reinforced concrete
Broken rock and macadam concrete
Broken brick concrete
Light concrete (cinder concrete)
Light concrete (cinder concrete)
Light concrete (cinder concrete)
Heat absorbing sponge concrete
Heat absorbing sponge concrete
Heat absorbing sponge concrete
Heat absorbing sponge concrete
24
Unit
weight
, kg/m3
Thermal
conductivity
,W/m.K
I. Asbestos-based materials
1900
0.35
500
0.13
300
0.09
II. Concrete panels
2500
2400
2200
1800
1500
1200
1000
1000
800
600
400
1.55
1.28
0.87
0.70
0.52
0.41
0.40
0.29
0.21
0.15
Specific
heat
capacity,
kJ/kg.K
Moisture
conductivity
mg/m.h.kPa
0.84
0.84
0.84
0.03
0.39
-
0.84
0.84
1.21
0.84
0.80
0.75
0.75
0.84
0.84
0.84
0.84
0.00
0.03
0.05
0.07
0.09
0.11
0.14
0.08
0.08
0.13
0.20
QCVN 09:2013/BXD
Heat absorbing silicate sponge concrete
Heat absorbing silicate sponge concrete
Heat absorbing silicate sponge concrete
Drywall
Pure gypsum boards and pieces
Kiln cinder gypsum concrete
800
600
400
0.29
0.21
0.15
0.84
0.84
0.84
0.18
0.21
0.24
III. Gypsum-based materials
1000
0.23
1000
0.41
1000
0.37
0.84
0.84
0.80
0.05
0.11
0.15
IV. Terracotta materials, cushion materials, building brick blocks and coating layers
Rammed clay and clay bricks
2000
0.93
0.84
Adobe
1600
0.70
1.05
Underneath humus
1800
1.16
0.84
Dry sand used as a cushion material
1600
0.58
0.84
Cushion materials made of sifted dry humus
1400
0.52
0.84
Silicate soil used as a cushion layer
600
0.17
0.84
Common bricks laid with heavy mortar
1800
0.81
0.88
Common bricks laid with light mortar
1700
0.76
0.88
Silicate bricks laid with heavy mortar
1900
0.87
0.84
Multi-hole bricks (γ = 1300) laid with light
mortar (γ = 1400)
1350
0.58
0.88
Multi-hole bricks laid with heavy mortar
1300
0.52
0.88
Heavy mortar and coating cement mortar
1800
0.93
0.84
3-constituent mortar and 3-constituent coating
mortar
1700
0.87
0.84
Lime mortar
1600
0.81
0.84
V. Non-fired brick, autoclaved aerated concrete
AAC non-fired brick
400-900
0.12-0.13
Autoclaved aerated concrete (AAC lightweight
400-800
0.153
brick)
Autoclaved aerated concrete brick
400-1000
0.11-0.22
300
0.10
400
0.12
500
0.14
Autoclaved aerated concrete (Chinese standard
GB-11968:2006)
600
0.16
700
0.18
800
0.20
Peat-based insulating board
Kiln cinder
Kiln cinder
Blast furnace cinder in particle state
Cinder brick
Light cinder mortar
Light cinder mortar
VI. Coal and cinder materials
225
1000
700
500
1400
1400
1200
0.07
0.29
0.22
0.16
0.58
0.64
0.52
1.67
0.75
0.75
0.75
0.75
0.75
0.75
0.10
0.17
0.17
0.19
0.30
0.11
0.12
0.11
0.15
0.09
0.10
0.12
0.19
0.20
0.22
0.23
0.11
0.14
25
Unofficial translation - QCVN 09: 2013/BXD
External coating lime mortar
Internal coating lime mortar
External coating mortar for wood lath
Internal coating mortar for wood lath
Lime coating mortar mixed with slag
Surface coating hard wood fiber board
Quality paperboard
Normal paperboard
Corrugated paperboard
Resin paper, bitumen paper
Rice husk
Rush
Straw
Straw-based panel
Rush-based panel 1900
Window glass
Fiberglass
Vapor glass and bubble glass
Vapor glass and bubble glass
Pine and (cross the grain)
Pine and (along the grain)
Sawdust
Treated sawdust
Sawdust mixed with resin
Plywood
Fiberboard
-ditto
-ditto
Soft wood board (corkwood)
Boards made of corkwood waste
Steel – sheet metal
Pig iron
Aluminum
Indoor matting (cotton rug)
26
1600
1600
1400
1400
1200
700
0.87
0.70
0.70
0.52
0.47
0.23
0.84
0.84
1.05
1.05
0.80
1.47
0.14
0.14
0.12
0.12
0.14
0.08
VII. Scrolling materials
1000
700
150
600
0.23
0.17
0.06
0.17
1.47
1.47
1.47
1.47
-
VIII. Agricultural products
250
400
320
300
0.21
0.14
0.09
0.10
1.88
1.47
1.51
1.47
-
0.10
1.51
-
2500
0.78
200
0.06
500
0.16
300
0.12
X. Wooden and cork materials
0.84
0.84
0.84
0.84
0.00
0.49
0.02
0.02
360
IX. Glass materials
550
550
250
300
300
600
600
250
150
250
150
XI. Metals
0.17
0.35
0.09
0.13
0.12
0.17
0.16
0.08
0.06
0.07
0.06
2.51
2.51
2.51
2.30
1.88
2.51
2.51
2.51
2.51
2.09
1.88
0.32
0.26
0.26
0.25
0.02
0.11
0.09
0.34
0.04
0.05
7850
7200
2600
XI. Other materials
58
50
220
0.48
0.48
0.48
0
0
0
0.06
1.88
0.34
150
QCVN 09:2013/BXD
Mineral cotton rug
Mineral cotton rug
Patterned silicate boards and patterned silicate
cement boards
200
250
0.07
0.08
0.75
0.75
0.49
0.45
600
0.23
2.30
-
Patterned silicate boards and patterned silicate
cement boards
400
0.16
2.30
-
Patterned silicate boards and patterned silicate
cement boards
250
0.12
2.30
-
Notes:
1 W/m.K=0.86 kcal/m.h.oC; 1 kJ/kg.K=0.24 kcal/kg.oC ;
For new building materials not listed in this table, designers may use other international standards.
Table 2. Solar heat gain coefficient α of material surface
No
1
2
3
4
Surface, materials and colors
1. Materials
White paper
Dry peat
Particle ceramics
Cinder
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
2. Wall surface
Polished, bright colored limestone
Ditto, dark colored
Brownish yellow sandstone
Dark yellow sandstone
Red sandstone
Polished, white marble
Ditto, dark colored
Polished, light grey granite
Grey, polished granite
Enameled, white brick
Ditto, bright brown colored
Common, dusted bricks
Ditto, new red colored
Surface coating bricks, bright colored
Smooth, even concrete surface
Mortared surface, yellow-white painted
Ditto, dark colored
Ditto, white colored
Ditto, light blue colored
Ditto, light cement colored
Ditto, snow-white colored
Vapor silicate
Plain wood
Wood painted in dark colors
Wood painted in light yellow colors
Smooth polished bamboo
Normal bamboo
α ratio
0.20
0.64
0.8 - 0.85
0.81
0.35
0.50
0.54
0.62
0.73
0.30
0.65
0.55
0.60
0.26
0.55
0.77
0.70 - 0.74
0.45
0.54 - 0.65
0.42
0.73
0.40
0.59
0.47
0.32
0.56 - 0.59
0.59
0.77
0.60
0.43
0.60
27
Unofficial translation - QCVN 09: 2013/BXD
59
60
61
62
63
64
65
3. Roofing surface
New, white fibrocement boards
Ditto, used for 6 months
Ditto, used for 12 months
Ditto, re-coated with cement water
Ditto, used for 6 years
Corrugated mineral cotton boards
Light brownish mineral cotton boards
Roofing oilpaper, coarse finish
Ditto, sprinkle-coated with mineral particles
Ditto, sprinkled with grey colored sand particles
Ditto, sprinkled with dark colored sand particles
Light colored sheet metal
Black sheet metal
Red or brown roof tile
Grey cement roof tile
Polished or white plated steel
Ditto, in blue color
Galvanized steel, new
Ditto, dusted
Unpolished aluminum
Polished aluminum
4. Paint coated surface
Painted in bright red (pink) color
Painted in blue color
Painted with cobalt-based materials, in bright blue color
Ditto, purple color
Painted in yellow
Painted in red
5. Sidewalk and road surface
New asphalt
Old asphalt
Cinder concrete
Granite macadam
Sand mixed with gravel
Wet sand
Granite rock and gravel
66
67
68
69
70
71
72
73
74
75
6. Transparent materials
Polyclovinil screen, thickness 0.1 mm
AFF polyamide screen, thickness 0.08 mm
Polyethylene screen, thickness 0.085 mm
7 mm-thick glass
4,5 mm-thick door glass
6 mm-thick glass with heat absorbing surface
17 mm-thick imaging glass
1.2 mm-thick colorless organic glass
Ditto, yellow colored, 2.7 mm in thickness
Ditto, blue colored, 1.4 mm in thickness
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
28
0.42
0.61
0.71
0.59
0.83
0.61
0.53
0.91
0.84
0.88
0.90
0.26
0.86
0.65 - 0.72
0.65
0.45
0.76
0.30
0.90
0.52
0.26
0.52
0.64
0.58
0.83
0.44
0.63
0.89
0.67
0.89
0.80
0.66
0.80
0.67
0.096
0.164
0.109
0.076
0.04
0.306
0.02
0.123
0.46
0.34
QCVN 09:2013/BXD
Table 3. Surface heat transfer coefficient of envelope structures h, W/m2.K
(in accordance with TCVN 298:2003 and ISO 6946:1996 standards)
Heat flux direction
Horizontal
Upward
Downward
(for walls)
(for roofing)
(for roofing)
Outer surface heat
transfer coefficient hN,
W/m2.K
25
25
25
Inner surface heat
transfer coefficient hT,
W/m2.K
7.692
10
5.882
Name of coefficient
Table 4. Thermal resistance of unventilated air layer Ra, m2.K/W
(in accordance with TCVN 298:2003 and ISO 6946:1996 standards)
Heat flux direction
Horizontal
Upward
Downward
(for vertical air layer)
(for horizontal air layer)
(for horizontal air layer)
0
0.00
0.00
0.00
5
0.11
0.11
0.11
7
0.13
0.13
0.13
10
0.15
0.15
0.15
15
0.17
0.16
0.17
25
0.18
0.16
0.19
50
0.18
0.16
0.21
100
0.18
0.16
0.22
300
0.18
0.16
0.23
Air layer
thickness, mm
Notes: Intermediate values may be determined using linear interpolation.
3. Select common exterior wall and roof designs, and total thermal resistance Ro may be calculated
using equation (1).
3.1. WALLS
T1. Single-leaf wall (conventional
bricks
thickness: 110 mm), fireclay solid
- L í p v÷a tr¸ t  = 15 m m
- G¹ ch ®Êt sÐt nung  = 105 m m
- L í p v÷a tr¸ t  = 15 m m
29
15
105
15
Unofficial translation - QCVN 09: 2013/BXD
- Plaster δ=15 mm
- FireclayThermal
bricks δ=105 mm
Thickness,
- Plaster
δ=15 mm
conductivity,
No
Material layers, outside in
1
Exterior plaster
Fireclay solid brick and heavy
(cement) mortar brickwork
Interior plaster
2
3
m
, W/(m.K)
0.015
0.93
0.105
0.81
0.015
0.93
Total
thermal
resistance
Ro,
m2.K/W
Qualified or not
qualified for Code
requirements
0.332
Ro<0.56 m2.K/W
Not qualified!
T2. One brick thick wall (conventional thickness: 220 mm), fireclay solid bricks
Plaster
δ=15 mm
L
í p v÷a
tr¸ t  = 15 m m
Fireclay bricks δ=105 mm
G¹ ch ®Êt sÐt nung  = 105 m m
Joint mortar δ=10 mm
V
÷a chÌ
n δ=105
m ¹ ch
Fireclay
bricks
mm = 10 m m
Plaster
G¹
chδ=15
®Êtmm
sÐt nung  = 105 m m
- L í p v÷a tr¸ t  = 15 m m
60 10
----
15
Material layers, outside in
1
Exterior plaster
Fireclay solid brick and heavy
(cement) mortar brickwork
Interior plaster
3
15
Thermal
Thickness,
conductivity,
m
, W/(m.K)
No
2
105 10 105
0.015
0.93
0.220
0.81
0.015
0.93
Total
thermal
resistance
Ro,
m2.K/W
Qualified or not
qualified for Code
requirements
0.474
Ro<0.56 m2.K/W
Not qualified!
T3. Single-leaf wall (conventional thickness: 110 mm), fireclay hollow bricks
---
Plaster
L í p δ=15
v÷amm
tr¸ t  = 15 m m
Hollow bricks δ=105 mm
G¹ chδ=15
rç ng
Plaster
mm  = 105 m m
- L í p v÷a tr¸ t  = 15 m m
15
30
105
15
QCVN 09:2013/BXD
Thermal
Thickness,
conductivity,
m
, W/(m.K)
No
Material layers, outside in
1
Exterior plaster
Hollow bricks (γ = 1300) and light
plaster (γ = 1400) brickwork
Interior plaster
2
3
0.015
0.93
0.105
0.58
0.015
0.93
Total thermal
resistance Ro,
m2.K/W
Qualified or not
qualified for Code
requirements
0.383
Ro<0.56 m2.K/W
Not qualified!
T4. Calculating thermal resistance for one brick thick walls (conventional thickness: 20 mm),
fireclay hollow bricks
----
60 10
15
105 10 105
Material layers, outside in
1
Exterior plaster
Hollow bricks (γ = 1300) and light
mortar (γ = 1400) brickwork
or
Multi-hole bricks with heavy
(cement) mortar brickwork
Interior plaster
3
15
Thermal
Thickness,
conductivity,
m
, W/(m.K)
No
2
Plaster δ=15 mm
L í p v÷a tr¸ t  = 15 m m
Hollow bricks δ=105 mm
G¹
rç ng
= 105 m m
Jointch
mortar
δ=10mm
Hollow
bricksδ=105
mm  = 10 m m
V
÷a chÌ
n m ¹ ch
Plaster
mm  = 105 m m
G¹
chδ=15
rç ng
- L í p v÷a tr¸ t  = 15 m m
0.015
0.93
0.220
0.58
or
0.52
0.015
0.93
Total
thermal
resistance
Ro,
m2.K/W
0.584
or
0.625
Qualified or not qualified
for Code requirements
Ro>0.56 m2.K/W
Qualified
or
Qualified and over
qualified
T5. Brick, porous concrete and single-leaf walls (conventional thickness: 110 mm)
-- Plaster
L í p δ=15
v÷amm
tr¸ t  = 15 m m
- Autoclaved lightweight concreteδ=105 mm
Bl ècδ=15
bª mm
t«ng nhÑ  =105 m m
-- Plaster
- L í p v÷a tr¸ t  = 15 m m
15
105
15
31
Unofficial translation - QCVN 09: 2013/BXD
Thermal
Thickness,
conductivity,
m
, W/(m.K)
No
Material layers, outside in
1
Exterior plaster
0.015
0.93
2
Porous concrete bricks
0.105
0.37
Total
thermal
resistance
Ro,
m2.K/W
Qualified or not
qualified for Code
requirements
Ro<0.56 m2.K/W
Not qualified!
0.486
3
Interior plaster
0.015
0.93
T6. Brick, porous concrete and one brick thick walls (conventional thickness: 220 mm)
60 10
-----
Plasterδ=15 mm
L
í p v÷alightweight
tr¸ t  =concrete
15 m m
Autoclaved
δ=105 mm
Bl
èc
bª t«ng
nhÑ  = 105 m m
Joint
mortar
δ=10 mm
Autoclaved
 = 10 m mmm
V
÷a chÌlightweight
n m ¹ chconcreteδ=105
Plaster
mm nhÑ = 105 m m
Bl
èc δ=15
bª t«ng

- L í p v÷a tr¸ t  = 15 m m
15
105 10 105
15
Thermal
Thickness,
conductivity,
m
, W/(m.K)
No
Material layers, outside in
1
Exterior plaster
0.015
0.93
2
Porous concrete bricks
0.220
0.37
3
Interior plaster
0.015
0.93
Total
thermal
resistance
Ro,
2
m .K/W
Qualified or not
qualified for Code
requirements
Ro>0.56 m2.K/W
Qualified and over
qualified
0.797
T7. 3D 180 mm thick panels
---
Plasterδ=15 mm
L í p v÷a tr¸ t  = 15 m m
Sand cement layer, with steel mesh δ=50 mm
 = 50 m m
L í p x i panel
m ¨ ng
c¸ tmm
Polystyrol
δ=20-50
Sand
layer,
cã lcement
- í i thÐ
p with steel mesh δ=50 mm
Plasterδ=15
T Êm polmm
y sty rol  = 20 - 50 m m
- L í p x i m ¨ ng c¸ t  = 50 m m
cã l - í i thÐp
- L í p v÷a tr¸ t  = 15 m m
15
No
Material layers, outside in
1
Exterior plaster
32
50 2050
15
Thickness, m
Thermal
conductivi
ty, ,
W/(m.K)
0.015
0.93
Total
thermal
resistance
Ro,
2
m .K/W
0.81÷ 1.56
Qualified or not qualified
for Code requirements
QCVN 09:2013/BXD
Cement, sand and steel mesh
Ro>0.56 m2.K/W
0.05
0.93
3D panels
Qualified and over
qualified
Porous polystyrol insulating
3
0.02÷ 0.05
0.04
or excessively over
layer
qualified
Cement, sand and steel mesh
4
0.05
0.93
3D panels
5
Interior plaster
0.015
0.93
Notes: The total thermal resistance of exterior walls is calculated using the heat transfer coefficient of
the exterior surface - hN= 25 W/m2.K and heat transfer coefficient of the interior surface - hT= 7,692
W/m2.K – see Table 3, Annexes.
3.2. ROOF
2
M1. Roofing with a 105 mm thick hollow brick insulating layer
--
Terra cotta tile 200x200x15 mm
G¹ ch l ¸ nem 200 200 15 m m
Tiling mortar δ=10 mm
V ÷a l ¸ t  = 10 m m
Heat resistant brick 200x200x105 mm, δ=105 mm
G¹ ch chèng nãng 200 200 105 m m ,  = 105 m m
Damp resistant steel mesh cement mortar δ=20 mm
V ÷a x i m ¨ ng l - í i thÐp chèng thÊm  = 20 m m
Roof reinforced concrete δ=120 mm
Bª t«ng cèt thÐp m ¸ i  = 120 m m
Ceiling
plaster
δ=15
V
÷a tr¸
t trÇ
n  mm
= 15 m m
Thermal
conductivity
, , W/(m.K)
No
Material layers, top down
Thickne
ss, m
1
Terra cotta tile
0.015
0.81
2
Tile plaster
0.01
0.93
3
Fireclay tile (continuous parts)
0.105
0.81
4
0.053
0.81
6
Fireclay tile (partition walls)
Aerated hollow holes, Ra = 0.22 m2. K
/W
Vertical plaster lining
0.105
0.93
7
Cement and steel mesh plaster
0.02
0.93
8
Reinforced concrete
0.12
1.55
9
Interior plaster
0.015
0.93
5
0.053
Total
thermal
resistance
Ro,
m2.K/W
Qualified or not
qualified for Code
requirements
0.640
Ro< 1.0 m2.K / W
Not qualified
M2. Roofing with a 105 mm thick hollow brick insulating layer and 150 mm thick porous concrete
=1000 kg/m3
With composition similar to the M1 roof, but with an additional 150 mm thick lightweight concrete –
porous concrete layer =1000 kg/m3 - =0.41 W/(m.K) on top of the heat insulating tiles, resulting in
a total thermal resistance of the M2 roof of Ro=1.006 m2.K/W – qualified.
33
Unofficial translation - QCVN 09: 2013/BXD
No
Material layers, top down
Thicknes
s, m
1
Terra cotta tile
0.015
Total
Thermal
thermal
conductivit
resistance
y, ,
Ro,
W/(m.K)
m2.K/W
0.81
2
Tile plaster
Lightweight-porous concrete layer
(=1000 kg/m3)
Fireclay tile (continuous parts)
0.01
0.93
0.150
0.41
0.105
0.81
0.053
0.81
7
Fireclay tile (partition walls)
Aerated hollow holes, Ra = 0.22 m2. K /
W
Vertical plaster lining
0.105
0.93
8
Cement and steel mesh plaster
0.02
0.93
9
Reinforced concrete
0.12
1.55
10
Interior plaster
0.015
0.93
3
4
5
6
1.006
0.053
Qualified or not
qualified for Code
requirements
Ro> 1.0 m2.K / W
Qualified
M3. Roofing with 30 mm thick polystyrol porous panels
----
Terrach
cotta
200x200x15
mm
G¹
l ¸ tile
nem
200 200
15 m m
Tiling
mortar
δ=10
mm
V ÷a l ¸ t  =10 m m
Polystyrol panel δ=30 mm
TÊm x èp pol y sty rol  = 30 m m
Cement mortar δ=5 mm
V ÷a x i m ¨ ng  =5 m m
Damp resistant polymer cement δ=2 mm
X
i m ¨ ng pol i m er chèng thÊm  =2 m m
Roof reinforced concrete δ=120 mm
Bª
t«ng
cèt
thÐ
p m ¸ i  = 120 m m
Ceiling
plaster
δ=15
mm
- V ÷a tr¸ t trÇn  =15 m m
Thickne
ss, m
Thermal
conductivi
ty, ,
W/(m.K)
No
Material layers, top down
1
Terra cotta tile
0.015
0.81
2
Tile plaster
0.01
0.93
3
Polystyol panel
0.03
0.04
4
0.05
0.93
0.002
0.93
6
Cement plaster
Damp resistance polymer cement
plaster
Reinforced concrete
0.12
1.55
7
Interior plaster
0.015
0.93
5
34
Total
thermal
resistance
Ro,
m2.K/W
Qualified or not
qualified for Code
requirements
1.140
Ro > 1.0 m2.K / W
Qualified
QCVN 09:2013/BXD
Notes: The total thermal resistance of roofing is calculated using the heat transfer coefficient of the
exterior surface - hN= 25 W/m2.K and heat transfer coefficient of the interior surface - hT= 5,882
W/m2.K – see Table 3, Annexes.
35