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JGJ 26-2010 English PDF (JGJ26-2010)

JGJ 26-2010 English PDF (JGJ26-2010)

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JGJ 26-2010: Design standard for energy efficiency of residential buildigns in severe cold and cold zones

This standard was formulated with a viewing to implementing the relevant national laws, regulations and policies on energy conservation and environment protection, improving the thermal environment in residential buildings in severe cold and cold zones and improving the energy efficiency of heating. This standard applies to the design for energy efficiency of those constructed, renovated and extended residential buildings in severe cold and cold zones.
JGJ 26-2010
JGJ
Industry Standard of the People's Republic of China
P File No.. J 997-2010
Design Standard for Energy Efficiency of Residential
Buildings in Severe Cold and Cold Zones
ISSUED ON. MARCH 18, 2010
IMPLEMENTED ON. AUGUST 1, 2010
Issued by. Ministry of Housing and Urban-Rural Development of the People's Republic of China
Table of Contents
1 General Provisions . 7
2 Terms and Symbols . 7
2.1 Terms . 7
2.2 Symbols . 8
3 Climate Sub-zone and Calculation Parameter of Indoor Thermal Environment . 8 4 Building and Envelope Thermal Design .. 9
4.1 General Requirements . 9
4.2 Envelope Thermal Design . 10
4.3 Building Envelope Thermal Performance Trade-off .. 15
5 Energy Efficiency Design on HVAC System . 18
5.1 General Requirements .. 18
5.2 Heat Source, Heating Plant and Heat Supply Network . 18
5.3 Heating System . 22
5.4 Ventilation and Air-conditioning System . 24
Appendix A Climate Zone Criteria, Weather Data, Heat Loss Index Requirements of Building for Cities .. 27
Appendix B Methodology for Mean Heat Transfer Coefficient and Linear Heat Transfer Coefficient of Thermal Bridge . 45
Appendix C Calculation of Heat Transfer Coefficient of Ground of Building . 50 Appendix D Simplification on Building Shading Coefficient . 54
Appendix E Correction Factor of Building Envelope (??) and Temperature Difference Correction Factor of Enclosing Balcony (??) . 58
Appendix F Building Area and Volume . 85
Appendix G Minimum Thickness of Heating Pipe's Insulation Layer (??min) . 87 Explanation of Wording in This Code . 90
List of Quoted Standards . 91
1 General Provisions
1.0.1 This standard was formulated with a viewing to implementing the relevant national laws, regulations and policies on energy conservation and environment protection, improving the thermal environment in residential buildings in severe cold and cold zones and improving the energy efficiency of heating.
1.0.2 This standard applies to the design for energy efficiency of those constructed, renovated and extended residential buildings in severe cold and cold zones.
1.0.3 The residential buildings in severe cold and cold zones must adopt energy saving design. On the condition of ensuring the indoor thermal environment, the thermal, heating and ventilating as well as air conditioning design shall control the energy consumption for heating within the specified range.
1.0.4 The energy efficiency design of residential buildings in severe cold and cold zones shall not only comply with those specified in this standard, but also shall comply with those specified in the relevant current national standards.
2 Terms and Symbols
2.1 Terms
2.1.1 Heating degree day based on 18 ??? (hereinafter referred as heating degree day) Heating degree days in a year, gotten by accumulating the difference of the mean daily temperature (in a day when the mean daily temperature outdoor is under 18 ???) to 18 ???, multiplied by 1d.
2.1.2 Cooling degree day based on 26 ??? (hereinafter referred as cooling degree day) Cooling degree days in a year, gotten by accumulating the difference of the mean daily temperature (in a day when the mean daily temperature outdoor is higher than 26???) to 26 ???, multiplied by 1d.
2.1.3 Heating period for calculation
Number of days that the mean daily temperature is under or equal to 5 ???, gotten by rolling mean method. The heating period for calculation is only used for building energy efficiency design calculation, and it may not be equal to the number of local statutory heating days. 2.1.4 Mean outdoor temperature during heating period
Arithmetic mean value of outdoor mean daily temperature during heating period for calculation
2.1.5 Shape factor
The ratio of the building external surface area contacting the outdoor atmospheric air to the enclosed volume of the building. The external surface area excludes the area of floor, and non-heating staircase internal wall and doors.
2.1.6 Index of heat loss of building
Under the mean outdoor temperature during heating period, the quantity of heat supplied by the indoor heating equipment, required for keeping the interior design calculation temperature in unit time on unit building area.
2.1.7 Heat transfer coefficient of building envelope
Heat transferred through the building envelope in unit time on unit area under the steady state condition that the air temperature difference on both sides of the building envelope is 1 ???. 2.1.8 Mean heat transfer coefficient of external wall
The heat transfer coefficient of external wall, in consideration of thermal bridge affect in wall.
2.1.9 Modification coefficient of building envelope
Correction factor introduced in consideration of the influence of solar radiation on building envelope heat transmission.
2.1.10 Window to wall ratio
The ratio of the window hole area to the room vertical plane unit area (area enclosed by building story height and bay position line).
2.1.11 Efficiency of boiler
The efficiency of a boiler under actual operation condition during heating period. 2.1.12 Efficiency of network
the ratio of the network output total heat to the total heat supplied into the network. 2.1.13 Ratio of electricity consumption to transferred heat quantity
Under the heating calculated temperature indoor and outdoor, the ratio of the full-day theoretical pump power consumption to the full-day heating load.
2.2 Symbols
2.2.1 Weather data
HDD18?€??€?Heating degree day, ?????d;
CDD26?€??€?Cooling degree day, ?????d;
Z?€??€?Heating period for calculation, d;
te?€??€?Mean outdoor temperature during heating period, ???.
2.2.2 Building
S?€??€?Shape factor, 1/m;
qH?€??€?Index of heat loss of building,W/m2;
K?€??€?Heat transfer coefficient of building envelope, W/ (m2??K);
Km?€??€?Mean heat transfer coefficient of external wall, W/ (m2??K);
??i?€??€?Correction factor of Heat transfer coefficient of building envelope, zero dimension. 2.2.3 Heating System
??1?€??€?Heat delivery efficiency of outdoor network, zero dimension;
??2?€??€?Efficiency of boiler, zero dimension;
EHR?€??€?Ratio of electricity consumption to transferred heat quantity, zero dimension. 3 Climate Sub-zone and Calculation Parameter of Indoor Thermal
Environment
3.0.1 According to the range of different heating degree day (HDD 18) and cooling degree day (CDD 26), the severe cold and cold zones can be divided into 5 climate sub-zones indicated in Table 3.0.1.
Table 3.0.1 -- Climate sub-zones in energy efficiency design of residential buildings in severe cold and cold zones
if arranged, shall not be larger than 400mm; the heat transfer coefficient limit of bay window shall be 15 % lower than the one of ordinary window, and the heat transfer coefficient of its nontransparent top, bottom and side shall be less than or equal to the one of the external wall. The window area of bay window and the wall area occupied by the bay window, worked out for the window to wall ratio, shall be calculated according to the window aperture opening area. 4.2.6 The external window and open balcony door shall have good leak tightness. the airtightness grade of external window and open balcony in severe cold zone shall not be lower than grade 6 specified in the national standard "Graduations and Test Methods of Air Permeability Water Tightness Wind Load Resistance Performance for Building External Windows and Doors" GB/T 7106-2008. The airtightness grade of external window and open balcony door of layer 1~6 in cold zone shall not be lower than grade 4 specified in the national standard "Graduations and Test Methods of Air Permeability Water Tightness Wind Load Resistance Performance for Building External Windows and Doors" GB/T 7106-2008, and the one of layer 7 or higher layer shall not be lower than grade 6.
4.2.7 The thermal insulation of close type balcony shall meet the following requirements. 1 Separation wall and door/ window shall be arranged between balcony and directly connected room.
2 When no separation wall or door / door is arranged between balcony and directly connected room, balcony shall be used as a part of the room. The heat transfer coefficient of the wallboard, top plate and floor contacting outdoor air must meet the requirements of Article 4.2.2 in this standard, and the balcony window to wall ratio must meet the requirements of Article 4.1.4 in this standard.
3 When separation wall and door / door are arranged between balcony and directly connected room, the heat transfer coefficient of them is not larger than the limits listed in Article 4.2.2 of this standard, and the window to wall ratio is lower than the limits listed in Table 4.1.4, special heat engineering may not be required for the balcony external surface. 4 When separation wall and door / door are arranged between balcony and directly connected room, and the heat transfer coefficient of them is larger than the limits listed in Article 4.2.2 of this standard, the heat transfer coefficient of the wallboard, top plate and floor contacting outdoor air shall not be larger 120 % than the limits listed in Article 4.2.2 in this standard; the heat transfer coefficient of balcony window in severe cold zone shall not be larger than 2.5W/ (m2??K); The heat transfer coefficient of balcony window in cold zone shall not be larger than 3.1W/ (m2??K); The window to wall ratio of balcony external surface shall not be larger than 60 %; and the window to wall ratio of the separation wall between balcony and directly connected room shall not exceed the limit listed in Table 4.1.4 of this standard. When the surface width of the balcony is less than the bay width of the directly connected room, the window to wall ratio of the separation wall is calculated according to the room bay. 4.2.8 Th...

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