GB/T 50668-2011 English PDF
Basic dataStandard ID: GB/T 50668-2011 (GB/T50668-2011)Description (Translated English): Standard for energy efficient building assessment Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: P31 Classification of International Standard: 91.120.01 Word Count Estimation: 135,167 Date of Issue: 2011-04-02 Date of Implementation: 2012-05-01 Quoted Standard: GB 50019; GB/T 50033; GB/T 50034; GB 50180; GB 50189; GB 50325; GB 50364; JGJ 26; JGJ 75; JGJ 134; JGJ 203; GB/T 7106; GB 12021.3; GB/T 14549; GB 17896; GB 18613; GB 19043; GB 19044; GB 19210; GB 19415; GB 19573; GB 19574; GB 19576; GB 19577; GB 20052; GB 20053; GB 20054; GB 20665; GB/T 21086; GB 21454; GB 21455; GB 21518 Regulation (derived from): Ministry of Housing and Urban-Rural Development Bulletin No.970 Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Summary: This standard specifies the construction of energy-saving technologies, promoting the sustainable development of the building, evaluation of energy-efficient buildings. This standard applies to new, saving evaluation renovation and expansion of residential buildings and public buildings. GB/T 50668-2011: Standard for energy efficient building assessment---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.1 General 1.0.1 In order to implement the basic national policy of saving energy resources, guide the adoption of advanced and applicable building energy-saving technologies, promote the sustainable development of buildings, and standardize the evaluation of energy-saving buildings, this standard is compiled. 1.0.2 This standard applies to the energy-saving evaluation of newly-built, rebuilt and expanded residential buildings and public buildings. 1.0.3 The evaluation of energy-saving buildings shall meet the following requirements. 1 The evaluation of energy-saving buildings should include buildings and their energy-using systems, covering two stages of design and operation management; 2 The evaluation of energy-saving buildings should be carried out under the premise of achieving the applicable indoor environment. 1.0.4 The evaluation of energy-saving buildings should not only comply with the provisions of this standard, but also meet the provisions of the relevant current national standards. 2 terms2.0.1 energy efficient building Following the local geographical environment and the basic methods of energy conservation, the buildings designed and constructed meet or exceed the relevant national energy conservation standards. 2.0.2 energy efficient building assessment energy efficient building assessment According to the energy-saving technical measures and energy-saving management measures adopted by the building, the method of combining quantitative and qualitative methods is adopted to analyze and judge the energy-saving performance of the building and determine the level of energy-saving buildings. 2.0.3 heat transfer coefficient of building envelope Under steady-state conditions, the air temperature difference on both sides of the enclosure structure is 1°C, and the heat transfer through the enclosure structure per unit area in unit time. 2.0.4 mean heat transfer coefficient of building envelope The heat transfer coefficient of the envelope structure is obtained after considering the influence of the thermal bridge existing in the envelope structure. 2.0.5 energy performance contracting (EPC) The energy-saving service company and the energy-consuming unit agree on the energy-saving target of the energy-saving project in the form of a contract. The energy-saving service company provides the necessary services to the energy-consuming unit in order to achieve the energy-saving target. Energy saving service mechanism.3 Basic Regulations3.1 Basic requirements 3.1.1 Energy-saving building evaluation should include two stages. energy-saving building design evaluation and energy-saving building engineering evaluation. 3.1.2 The evaluation of energy-saving buildings should take a single building or a building community as the object. When evaluating a single building, the indicators related to the outdoor part should be based on the evaluation results of the outdoor conditions of the building; the energy-saving evaluation of the building district should be carried out on the basis of the evaluation of the single building, and the energy-saving level of the building district should be It is determined according to the energy-saving level that all single buildings in the community have reached or exceeded. 3.1.3 The evaluation of energy-saving building design should be carried out after the architectural design drawing has passed the energy-saving review of relevant departments and passed; the evaluation of energy-saving building projects should be carried out after the building has passed the completion acceptance of energy-saving projects of relevant departments and has been in operation for one year. 3.1.4 Buildings applying for energy-saving building design evaluation shall provide the following materials. 1 Building energy-saving technical measures; 2 planning and architectural design documents; 3 Planning and building energy-saving design documents; 4 Approval documents for building energy-saving design review. 3.1.5 In addition to the materials in the design evaluation stage, the following materials should be provided when applying for energy-saving building project evaluation. 1 Material quality certification documents or test reports; 2 Completion acceptance report of building energy conservation project; 3 Inspection reports, special analysis reports, operation management system documents, operation and maintenance materials and other related materials. 3.2 Evaluation and classification 3.2.1 The evaluation index system for energy-saving building design should be composed of six types of indicators. architectural planning, building envelope, heating, ventilation and air conditioning, water supply and drainage, electrical and lighting, and indoor environment; the evaluation index system for energy-saving building engineering should be composed of architectural planning, It consists of seven types of indicators including building envelope, heating ventilation and air conditioning, water supply and drainage, electrical and lighting, indoor environment and operation management. Each category of indicators should include control items, general items and preferred items. 3.2.2 Energy-saving buildings shall meet the requirements of all control items in Chapter 4 or Chapter 5 of this standard, and shall be classified into three grades of A, AA and AAA according to the degree of meeting general items and preferred items. Classification of energy-saving buildings shall comply with the provisions in Table 3.2.2-1 or Table 3.2.2-2. 3.2.3 AAA energy-saving buildings shall meet the following provisions in addition to the provisions of Article 3.2.2 of this standard; 1 In terms of envelope structure indicators, the number of preferred items that residential buildings meet should not be less than 2, and the number of preferred items that public buildings can meet should not be less than 3; 2 In terms of HVAC indicators, the number of preference items that should be met by residential buildings should not be less than 2, and the number of preference items that should be met by public buildings should not be less than 4; 3 In terms of electrical and lighting indicators, the number of preferred items that residential buildings meet should not be less than 1, and the number of preferred items that public buildings can meet should not be less than 2. 3.2.4 When a clause in the general items and preferred items in this standard is not suitable for the conditions of the building location, climate, building type, evaluation stage, etc., this clause does not need to participate in the evaluation, and the total number of items participating in the evaluation can be reduced accordingly. The requirements for the number of items shall be adjusted and determined according to the original ratio. After the requirements on the number of items are adjusted according to the original ratio, the number of general items to be satisfied by each category of indicators shall not be less than one. 3.2.5 The evaluation conclusion of each item in this standard should be pass or fail; for items with multiple requirements, if all the requirements of each item are not met, the evaluation conclusion cannot be passed. 3.2.6 The evaluation of energy-saving buildings in temperate regions should be carried out according to the corresponding provisions of the nearest climatic division.4 residential buildings4.1 Architecture Planning Ⅰ Controls 4.1.1 The site selection and overall planning design of residential buildings shall meet the requirements of urban planning and residential area planning. Evaluation method. Check the planning and design approval documents. 4.1.2 The sunshine and building density of the residential area shall comply with the relevant provisions of the current national standard "Code for Planning and Design of Urban Residential Areas" GB 50180. Evaluation method. Check planning and design approval documents and sunshine design calculations. 4.1.3 Project proposals or feasibility study reports and design documents for residential buildings should contain special energy-saving content. Evaluation method. Check the project proposal or feasibility study report and design drawings. Ⅱ General items 4.1.4 When the total number of living spaces of a single house in a building is greater than or equal to 4, at least 2 rooms shall be able to obtain sunlight in winter. Evaluation method. check the design drawings and the sunshine simulation analysis report. 4.1.5 The green area rate in the residential area shall not be lower than the following regulations. 1 The green area rate of the new district construction shall not be lower than 30%; 2 The green area rate of old district reconstruction shall not be lower than 20%. Evaluation method. check design drawings, green area calculation and on-site inspection. 4.1.6 The orientation of buildings in severe cold, cold areas, hot summer and cold winter areas shall meet the requirements of one of the following items, and the hot summer and warm winter areas shall meet the requirements of the following item 3. 1 North-south orientation of the building; 2 More than 40% of the main rooms face south; 3.More than 90% of the main rooms are protected from west-facing sunlight in summer, or external shading and other thermal insulation measures are taken to prevent 90% of the rooms from west-facing sunlight in summer. Evaluation method. check design drawings, special calculations and on-site inspection. 4.1.7 The architectural planning and layout of the residential area adopts the layout form that is conducive to the natural ventilation between building groups in summer. Qualitative or quantitative natural ventilation design for residential quarters and single buildings with a land area of less than 150,000 m2; quantitative natural ventilation simulation design for residential quarters and single buildings with a land area of more than 150,000 m2. Evaluation method. check the district ventilation calculation report. 4.1.8 The natural lighting in the public area of a single building or a residential area shall meet the requirements of one of the following items on the premise of meeting the illuminance of the functional area. 1 For the above ground part of the building, the proportion of natural lighting in the public area is greater than 30%; 2 For buildings with basements, the natural lighting area ratio of the public areas on the first basement floor is greater than 5%. Evaluation method. check design drawings and daylighting simulation calculations. 4.1.9 Use light pipes and reflective devices to introduce natural light into the underground parking lot or equipment room. Under the condition that the illumination of the functional area is satisfied, the natural lighting area shall not be less than 10% of the building area of the first floor of the basement. Evaluation method. check design drawings and daylighting simulation calculations. 4.1.10 All elevators in the building use energy-saving elevators and adopt energy-saving control methods. Evaluation method. check design drawings, equipment instructions and on-site inspection. Ⅲ Preferences 4.1.11 The actual measurement or simulation calculation proves that the daily average outdoor heat island intensity of the residential area is not greater than 1.5°C, or the following two measures are adopted to reduce the heat island intensity of the community. 1 The green area rate of the residential area shall not be less than 35%; 2 No less than 50% of the hard ground in the residential area shall be shaded or paved with light-colored materials with a solar radiation absorption rate of 0.3 to 0.6; 3 The ratio of unshaded surface parking spaces to the total surface parking spaces shall not exceed 10%; 4 No less than 30% of the roofs that can be greened are greened or no less than 75% of the non-green roofs are light-colored finishes, the solar radiation absorption rate of sloping roofs is less than 0.7, and the solar radiation absorption rate of flat roofs is less than 0.5; Evaluation method. check the design drawings, completion acceptance documents, and material inspection reports. Ⅱ General items 4.2.6 The average heat transfer coefficient of roofs, exterior walls, and unheated stair partition walls in severe cold and cold regions is 10% lower than the industry standard "Design Standards for Energy Conservation of Residential Buildings in Severe Cold and Cold Regions" JGJ 26; regions with hot summer and cold winter The average heat transfer coefficient of the roof, exterior walls, and exterior windows is 10% lower than the current industry standard "Design Standard for Energy Conservation of Residential Buildings in Hot Summer and Cold Winter Areas" JGJ 134. Evaluation method. check the design drawings, design calculations, and completion acceptance documents. 4.2.7 The heat transfer coefficient of outer windows in severe cold regions is less than 1.5W (m2·K); the heat transfer coefficient of outer windows in cold regions is less than 1.8W (m2·K). Evaluation method. Check the design drawings, performance parameter tables of doors and windows, and completion acceptance documents. 4.2.8 The entrance door of the unit in severe cold and cold regions shall be equipped with door buckets or other measures for sheltering from wind and seepage. Evaluation method. check design drawings, on-site inspection. 4.2.9 Building roofs and exterior walls in areas with hot summer and cold winter and hot summer and warm winter shall have good heat insulation measures, and the solar radiation absorption coefficient of roof and exterior wall materials shall be less than 0.6. Evaluation method. check design drawings, energy-saving analysis report, and on-site inspection. 4.2.10 In areas with hot summer and cold winter and hot summer and warm winter, insulation measures shall be taken for household walls and floor slabs, and the heat transfer coefficient shall meet the relevant current national energy-saving standards. Evaluation method. check design drawings, energy-saving analysis report, and on-site inspection. 4.2.11 The airtightness level of exterior windows in severe cold and cold regions shall not be lower than the 6th level stipulated in the current national standard GB/T 7106 "Airtightness, Watertightness, Wind Pressure Resistance Performance Classification and Testing Methods of Exterior Doors and Windows of Buildings". Evaluation method. check the design documents and the performance test report of the external window. 4.2.12 The roofs of residential buildings in hot summer and cold winter and hot summer and warm winter regions shall adopt vegetation greening roof or evaporative cooling roof, and the vegetation greening or evaporative cooling roof shall not be less than 40% of the total roof area. Evaluation method. check design documents and on-site inspection. Ⅲ Preferences 4.2.13 The average heat transfer coefficient of roofs, exterior walls, and exterior windows in severe cold and cold regions shall be reduced by another 20% compared with the current industry standard "Design Standards for Energy Conservation of Residential Buildings in Severe Cold and Cold Regions" JGJ 26. Evaluation method. check the design drawings, design calculations, and completion acceptance documents. 4.2.14 In severe cold and cold areas, if the building adopts airtight windows or windows with sealing strips, the room should be equipped with adjustable ventilation devices or other ventilation measures. Evaluation method. check design drawings, design calculations, completion acceptance data and on-site inspection. 4.2.15 The airtightness level of exterior windows in severe cold and cold regions shall not be lower than the 7th level stipulated in the current national standard GB/T 7106 "Airtightness, Watertightness, Wind Pressure Resistance Performance Classification and Testing Methods of Exterior Doors and Windows of Buildings". Evaluation method. check the design documents and the performance test report of the external window. 4.2.16 The openable area of the exterior windows of residential buildings in hot summer and cold winter and hot summer and warm winter regions shall not be less than 35% of the area of the exterior windows. Evaluation method. check design documents, on-site inspection. 4.2.17 For buildings in hot summer and cold winter and hot summer and warm winter regions, the south, east and west facing windows (including the transparent parts of balconies) shall be provided with movable external shading measures. Evaluation method. check design documents, on-site inspection. 4.2.18 The roofs of residential buildings in hot summer and cold winter and hot summer and warm winter regions shall adopt vegetation greening roof or evaporative cooling roof, and the vegetation greening or evaporative cooling roof shall not be less than 70% of the total roof area. Evaluation method. check design documents and on-site inspection. 4.3 Heating ventilation and air conditioning Ⅰ Controls 4.3.1 For buildings using centralized air-conditioning and heating, the heat load and hourly and item-by-item cooling load shall be calculated during the design stage of construction drawings, and corresponding equipment shall be selected according to the calculation results. Evaluation method. check the design calculation sheet. 4.3.2 The electricity consumption and heat transfer ratio (EHR) of the centralized hot water heating system and the delivery energy efficiency ratio (ER) of the air-conditioning cold and hot water system shall meet the current relevant national building energy-saving design standards. Evaluation method. check the design calculation sheet. 4.3.3 In central heating systems and central air-conditioning systems, heat metering devices should be installed at buildings or heat inlets. Evaluation method. check design drawings, completion acceptance documents and on-site inspection. 4.3.4 For buildings with central heating system and (or) central air conditioning system, separate rooms (households) or temperature control and adjustment devices should be installed for terminal equipment. Evaluation method. check design drawings, completion acceptance documents and on-site inspection. 4.3.5 Buildings with central heating system and (or) central air conditioning system shall be equipped with household heat sharing devices. 4.3.15 If the building design already includes the design and installation of the room air conditioner, the energy efficiency of the selected room air conditioner shall meet the specified value of the second-level energy efficiency grade in the current national standard "Energy Efficiency Limits and Energy Efficiency Grades of Room Air Conditioners" GB 12021.3; Or comply with the second-level specified value of GB 21455 "Energy Efficiency Allowable Values and Energy Efficiency Classes of Speed Controllable Room Air Conditioners". Evaluation method. check design drawings, equipment test reports and on-site inspection. 4.3.16 When the user-type gas-fired heating water heater is used as the heat source in the design, its energy efficiency shall meet the Class 2 standard in the current national standard "Energy Efficiency Limits and Energy Efficiency Grades of Household Gas Instant Water Heaters and Gas Heating Water Heaters" GB 20665. Evaluation method. review design drawings, equipment test reports and on-site inspection. 4.3.17 The heating pipe network has hydraulic balance measures (o......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 50668-2011_English be delivered?Answer: Upon your order, we will start to translate GB/T 50668-2011_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. 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