GB/T 51350-2019 English PDF

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GB/T 51350-2019: Technical standard for nearly zero energy buildings
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Basic data

Standard ID: GB/T 51350-2019 (GB/T51350-2019)
Description (Translated English): Technical standard for nearly zero energy buildings
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: P04
Classification of International Standard: 91.010.01
Word Count Estimation: 144,149
Date of Issue: 2019
Date of Implementation: 2019-09-01
Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; State Administration for Market Regulation

GB/T 51350-2019: Technical standard for nearly zero energy buildings

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Under the set calculation conditions, in order to meet the requirements of the indoor environment parameters, the accumulative annual consumption per unit area needs to be supplied by the indoor cooling equipment. 2.0.9 Air tightness of building envelope The ability of a building to prevent air infiltration when closed. It is used to characterize the amount of unorganized air infiltration of buildings or rooms under normal airtight conditions. The airtightness of buildings is usually tested by differential pressure test, and the airtightness of buildings is characterized by the number of air changes N50, that is, the number of air changes under a pressure difference of 50Pa between indoor and outdoor. 2.0.10 utilization ratio of renewable energy The proportion of renewable energy utilization in heating, ventilation, air conditioning, lighting, domestic hot water, and elevator systems to their energy demand. 2.0.11 Comprehensive building energy saving rate building energy saving rate The difference between the comprehensive value of building energy consumption of the design building and the reference building, and the ratio of the comprehensive value of building energy consumption of the reference building. 2.0.12 Building energy efficiency improvement rate Under the set calculation conditions, the difference between the comprehensive value of building energy consumption of the designed building excluding renewable energy generation and the comprehensive value of building energy consumption of the reference building f, and the ratio of the comprehensive value of building energy consumption of the reference building. 2.0.13 Sensible heat exchange efficiency The ratio of the temperature difference between the fresh air inlet and supply air outlet corresponding to the air volume to the temperature difference between the fresh air inlet and return air inlet. 2.0.14 total heat exchange efficiency total heat exchange efficiency The ratio of the enthalpy difference between the fresh air inlet and supply air outlet corresponding to the air volume to the enthalpy difference between the fresh air inlet and return air inlet. 2.0.15 thermally broken fixer An anchor bolt that can effectively reduce or block the thermal bridge effect of the anchor through a special structural design. 2.0.16 Water proof and vapor-permeable material It is a material that seals the gaps on the outside of the building envelope and has both waterproof and water vapor permeation functions. 2.0.17 air tightness material A material that seals the gaps inside the building envelope and prevents air from penetrating. 2.0.18 reference building When calculating the energy saving rate of the building itself and the overall energy saving rate of the building, it is used to calculate the national standard "Design Standard for Energy Conservation of Public Buildings" GB 50189-2015 and the industry standard "Design Standard for Energy Conservation of Residential Buildings in Severe Cold and Cold Regions" JGJ 26-2010, "Summer Heat Buildings with the comprehensive value of building energy consumption required by JGJ 134-2016, "Design Standard for Energy Conservation of Residential Buildings in Cold Winter Areas" and JGJ 75-2012, "Design Standards for Energy Conservation of Residential Buildings in Hot Summer and Warm Winter Areas".

3 Basic Regulations

3.0.1 Building design should be based on climate characteristics and site conditions, through passive design to reduce building cooling and heating requirements and improve the energy efficiency of active energy systems to achieve ultra-low energy consumption, on this basis, use renewable energy to balance and balance building energy consumption Substitution achieves near-zero energy consumption. When conditions permit, zero energy consumption should be achieved. 3.0.2 Indoor environmental parameters and energy efficiency indicators should be constrained indicators, and performance parameters such as enclosure structures, energy equipment and systems should be recommended indicators. 3.0.3 The calculation of building energy efficiency indicators shall comply with the provisions of Appendix A of this standard. 3.0.4 Performance-based design, refined construction technology, quality control and intelligent operation mode should be adopted. 3.0.5 Full decoration should be carried out. The interior decoration should be simple, and should not damage the airtight layer of the enclosure structure and affect the airflow organization, and should use materials and parts that have obtained the green building material label (or certification).

4 Indoor Environmental Parameters

4.0.1 The indoor heat and humidity environment parameters of the main rooms of the building shall comply with the provisions in Table 4.0.1. 4.0.2 The indoor fresh air volume of the main rooms of residential buildings should not be less than 30m3/(h·person). The fresh air volume of public buildings shall comply with the provisions of the current national standard "Code for Design of Heating, Ventilation and Air Conditioning in Civil Buildings" GB 50736. 4.0.3 The indoor noise of residential buildings should not exceed 40dB(A) during the daytime and 30dB(A) at night. The indoor noise level of hotel buildings should comply with the current national standard "Code for Design of Civil Building Sound Insulation" GB 50118.Design Specifications" GB 50118 stipulates high requirements for indoor permissible noise levels.

5 Energy efficiency indicators

5.0.1 The energy efficiency indicators of nearly zero-energy residential buildings shall comply with the provisions in Table 5.0.1. 5.0.2 The energy efficiency indicators of nearly zero-energy public buildings shall comply with the provisions in Table 5.0.2, and their building energy consumption values may be determined in accordance with Appendix B of this standard. 5.0.3 The energy efficiency indicators of ultra-low energy residential buildings shall meet the requirements in Table 5.0.3. 5.0.4 The energy efficiency indicators of ultra-low energy consumption public buildings shall comply with the provisions in Table 5.0.4. 5.0.5 The energy efficiency indicators of zero-energy residential buildings shall meet the following requirements. 1 The performance index of the building body shall comply with the provisions in Table 5.0.1 of this standard; 2 The building body and surrounding renewable energy production capacity should not be less than the building's annual terminal energy consumption. 5.0.6 The energy efficiency indicators of zero-energy public buildings shall meet the following requirements. 1 The performance index of the building body shall comply with the provisions in Table 5.0.2 of this standard; 2 The building body and surrounding renewable energy production capacity should not be less than the building's annual terminal energy consumption.

6 Technical parameters

6.1 Enclosure structure 6.1.1 The average heat transfer coefficient of non-light-transmitting enclosure structures of residential buildings may be selected according to Table 6.1.1. 6.1.2 The average heat transfer coefficient of non-light-transmitting envelope structures of public buildings may be selected according to Table 6.1.2. 6.1.3 The average heat transfer coefficient of the non-translucent enclosure structure separating heating space and non-heating space can be selected according to Table 6.1.3. 6.1.4 The airtight performance of external doors and windows shall meet the following requirements. 1 The airtight performance of the outer window should not be lower than Grade 8; 2 The airtight performance of the outer door and the door separating the heating space and the non-heating space should not be lower than Class 6. 6.1.5 The thermal performance parameters of exterior windows of residential buildings (including light-transmitting curtain walls) can be selected according to Table 6.1.5-1; the thermal performance parameters of exterior windows of public buildings (including light-transmitting curtain walls) can be selected according to Table 6.1.5-2. 6.1.6 The light-transmitting part of the outer door in severe cold regions and cold regions should comply with the provisions of Article 6.1.5 of this standard for external windows (including light-transmitting curtain walls); the heat transfer coefficient K value of the non-transparent part of the outer door in severe cold regions should not be greater than 1.2W /(m2·K), the heat transfer coefficient K value of the non-transparent part of the outer door in cold regions should not be greater than 1.5W/(m2·K). 6.1.7 The heat transfer coefficient K value of the door separating heating and non-heating spaces in severe cold regions should not be greater than 1.3W/(m2 k), and the heat transfer coefficient K value of door separating heating and non-heating spaces in cold regions should not be greater than 1.6W/(m2·K). 6.1.8 The size of door and window openings shall comply with the size of building door openings and window openings stipulated in the current national standard "Series of Building Door and Window Opening Dimensions" GB/T 5824, and the current national standard "Requirements for Coordination of Building Door and Window Opening Size" GB/T 5824 shall be preferred. T 30591 specifies the commonly used standard door and window opening dimensions. 6.1.9 When selecting the performance of external windows and sun-shading devices, the demand for sun-shading in summer, heat gain in winter and natural lighting shall be considered comprehensively. 6.2 Energy equipment and systems 6.2.1 When the distributed room air conditioner is used as the cold and heat source, its energy consumption efficiency in the cooling season shall comply with the provisions in Table 6.2.1. 6.2.2 When the user-type gas heating water heater is used as the heating heat source, its thermal efficiency shall meet the requirements in Table 6.2.2. 6.2.3 When the air source heat pump is used as the heat source for heating, the unit performance coefficient COP shall comply with the provisions in Table 6.2.3. 6.2.4 When multi-connected air-conditioning (heat pump) units are used, the cooling comprehensive performance coefficient IPLV (C) or unit energy efficiency rating index (APF) under nominal cooling conditions and specified conditions can be selected according to Table 6.2.4. 6.2.5 When gas-fired boilers are used, under their nominal operating conditions and specified conditions, the thermal efficiency of the boilers shall comply with the provisions in Table 6.2.5. 6.2.6 When a motor-driven vapor compression cycle chiller (heat pump) unit is used, its coefficient of performance (COP) or integrated part load coefficient of performance (IPLV) under nominal cooling conditions and specified conditions can be as shown in Table 6.2.6- 1 and Table 6.2.6-2 are selected. 6.2.7 The heat exchange performance of the fresh air heat recovery device shall meet the following requirements. 1 The sensible heat exchange efficiency of the sensible heat type should not be lower than 75%; 2 The total heat exchange efficiency of total heat type should not be lower than 70%. 6.2.8 The power consumption per unit air volume of fresh air in residential buildings should not exceed 0.45W/(m3 h), and the power consumption per unit air volume in public buildings should comply with the relevant provisions of the current national standard "Design Standards for Energy Conservation of Public Buildings" GB 50189. 6.2.9 The one-pass counting efficiency of the fresh air heat recovery system air purification device for fine particles greater than or equal to 0.5 μm should be higher than 80%, and should not be lower than 60%.

7 Technical measures

7.1 Design Ⅰ Performance Design Method 7.1.1 Performance-based design should adopt the organizational form of collaborative design. 7.1.2 The performance-based design shall be based on the indoor environmental parameters and energy efficiency index requirements stipulated in this standard, and shall use energy consumption simulation calculation software and other tools to optimize and determine the architectural design scheme. 7.1.3 Performance-based design should be carried out according to the following procedures. 1 Set indoor environmental parameters and energy efficiency indicators; 2 to formulate a design plan; 3 Quantitative analysis and optimization of design schemes using tools such as energy consumption simulation calculation software; 4 Analyze the optimization results and make a standard judgment. When the energy efficiency index cannot meet the determined target requirements, modify the design plan, re-do quantitative analysis and optimization until the target requirements are met; 5 Determine the preferred design scheme; 6 Prepare a performance-based design report. 7.1.24 When selecting the cold and heat sources of the heating and cooling system, performance parameter optimization and scheme comparison should be carried out based on economic and technical factors, and the following requirements should be met. 1 When distributed heating is used in severe cold areas, gas heating furnaces can be used; when centralized heating is used, ground source heat pumps, industrial waste heat or biomass boilers should be used as heat sources, and low-temperature heating methods should be adopted. 2 Ground source heat pumps or air source heat pumps should be used in cold regions and hot summer and cold winter regions. 3 In regions with hot summer and warm winter, more energy-efficient cooling equipment such as magnetic levitation units should be used. 7.1.25 The design of the heating and cooling system shall meet the following requirements. 1.Products with high energy efficiency levels should be selected first, and system energy efficiency should be improved; 2.It should be conducive to the direct or indirect use of natural cooling sources; 3 Multi-energy complementary integration optimization should be considered; 4 It should be adjusted flexibly according to the building load; 5 Priority should be given to the use of renewable energy; 6 The demand for domestic hot water should be taken into account. 7.1.26 Energy-consuming equipment such as circulating water pumps and fans shall adopt frequency conversion speed regulation. 7.1.27 According to the characteristics of building cooling and heating loads, optimize and determine the fresh air reheating scheme or take appropriate dehumidification technical measures. Ⅵ fresh air heat recovery and ventilation system 7.1.28 A fresh air heat recovery system shall be installed, and the design of the fresh air heat recovery system shall consider the rationality and reliability of the annual operation. 7.1.29 The type of fresh air heat recovery device should be determined in consideration of its energy-saving effect and economic efficiency, and high-efficiency heat recovery devices should be used in design. 7.1.30 The fresh air heat recovery system should be equipped with low-resistance and high-efficiency air purification devices. 7.1.31 Anti-freezing and anti-frost measures shall be taken for the fresh air heat recovery system in severe cold and cold areas. 7.1.32 The fresh air system of residential buildings should be set up independently for each household, and the fresh air volume should be supplied according to the needs of users. 7.1.33 The fresh air system should be equipped with a fresh air bypass pipe. When the outdoor temperature and humidity are suitable, the fresh air can directly enter the room without passing through the heat recovery device. 7.1.34 The fresh air, exhaust air and make-up air pipelines connected to the outdoors shall be equipped with heat-insulating and sealed electric air valves, and shall be linked with the system. 7.1.35 The kitchen of a residential building should be equipped with an independent supplementary air system, which should meet the following requirements. 1 The supplementary air should be introduced directly from the outside, the supplementary air duct should be insulated, and an insulated and sealed electric damper should be installed at the entrance, and the electric damper should be linked with the range hood; 2 The supplementary air outlet should be set as close to the stove as possible. Ⅶ Lighting and Elevators 7.1.36 High-efficiency and energy-saving light sources and lamps should be selected, and LED light sources should be selected. 7.1.37 The elevator system shall adopt an energy-saving control and drive system, and shall... ......

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