The newly revised national standard \"Construction Quality Acceptance Standard for Building Energy Efficiency Projects\" GB 50411-2019 (hereinafter referred to as the new version of the standard) has been officially released by the Ministry of Housing and Urban-Rural Development and officially implemented on December 1, 2019. The new version of the standard is more than the old version of the \"Building Energy efficiency engineering construction quality Acceptance Code\" GB50411-2019 (hereinafter referred to as the old version of the code), adding 3 chapters, 4 test methods and related management, inspection and technical content. The new version of the standard has improved the national standard system for building energy efficiency, and provided a unified technical standard for the construction quality acceptance of building energy efficiency projects that are more advanced with The Times.
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Here are the differences between the new standard and the old one.
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First, the main technical content of the new standard revision
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1. Add 3 chapters
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1) Energy Saving Project of Ground source Heat pump Heat Exchange System (14 chapters)
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It is suitable for the acceptance of construction quality of energy saving project of ground source heat pump buried pipe, groundwater and surface water heat exchange system. The pipes, fittings, pumps, automatic control valves, instruments, insulation materials and other products used in the energy-saving project of the ground source heat pump heat exchange system should be accepted.
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2) Solar Thermal system Energy Saving Project (15 chapters)
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It mainly increased the construction quality acceptance of domestic hot water, heating and air conditioning energy-saving projects in solar thermal systems. The pipes, equipment, valves, instruments, thermal insulation materials and other products used in the solar solar thermal system energy saving project should be accepted, and the thermal performance of the thermal collection equipment, thermal conductivity or thermal resistance, density, and water absorption of the thermal insulation materials used in the solar solar thermal system energy saving project should be reinspected when entering the site.
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3) Solar photovoltaic Energy Saving Project (16 chapters)
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Solar photovoltaic system building energy conservation project construction quality acceptance. Photovoltaic modules, bus boxes, cables, inverters, charge and discharge controllers, energy storage batteries, power grid connection units, master control and monitoring systems, shock protection and grounding, distribution equipment and accessories used in building energy conservation projects of solar photovoltaic systems should be accepted.
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2. Add four experimental methods
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1) Insulation material sticking area stripping test method;
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2) Field drawing test method for tensile bonding strength between insulation board and base layer;
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3) Thermal conductivity, dry density and compressive strength of thermal insulation slurry under the same condition curing test method;
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4) Insulating glass sealing performance test method.
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3. Add the following
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1) Management: energy-saving product certification; Energy-saving signs for doors and Windows;
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2) Inspection: the introduction of \"minimum sampling number of inspection batches\
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3) Technical content: functional roof; Thermal insulation material combustion performance; Outer wall insulation fire isolation belt; Lighting sources, lamps and their accessory devices; Geotechnical thermal response test of ground source heat pump buried pipe heat exchange system.
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Two, the old and new editions of each chapter comparison
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1 General Rules
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The new version of the building energy efficiency project has a clearer division of sub-division projects and sub-projects. The sub-projects in the old edition are incorporated into the sub-division projects in the new edition. The wall energy saving project, curtain wall energy saving project, door and window energy saving project, roof energy saving project and ground energy saving project are included in the enclosure structure energy saving project of the sub-division project; The heating energy saving project, ventilation and air conditioning energy saving project, cold and heat source and pipe network energy saving project are included in the sub-division project heating and air conditioning energy saving project; And the new renewable energy energy saving project sub-division project, including the sub-projects are ground source heat pump heat exchange system energy saving project, solar thermal system energy saving project and solar photovoltaic energy saving project.
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3 Basic Provisions
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2 Materials and equipment
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Materials and equipment to add the following terms:
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3.2.2 Public institution buildings and government-funded construction projects should use products that have passed the building energy saving product certification or have energy saving labels; For other construction projects, it is recommended to use products that have passed the building energy-saving product certification or have energy-saving labels. In order to ensure the effect of building energy conservation, this article puts forward quality assurance requirements for the products used in building energy conservation projects.
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3.2.5 When the stereotyped products, equipment and prefabricated components used in building energy saving projects involve building energy saving effects, it is difficult to inspect their materials, production processes and internal structures at the construction site, and it is impossible to verify their safety, durability and energy saving effects. Therefore, the production unit should supply supporting materials in a unified manner. And provide a type inspection report (valid for no more than 2 years) to prove that its quality and performance meet the energy-saving design requirements.
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4 Division of acceptance
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A more scientific inspection method of minimum sampling quantity of inspection lot is introduced.
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4 Wall energy saving project
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1 General Provisions
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4.1.3 The location, interface treatment, plate joints, structural joints and fixing methods of thermal insulation decorative board, prefabricated thermal insulation board or prefabricated thermal insulation wall board are added to the parts or contents of the acceptance of concealed works for wall energy saving projects. Energy saving construction of various deformation joints.
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4.1.4 Thermal insulation materials shall not only take protective measures such as moisture, water and fire protection during construction, but also take protective measures during transportation and storage.
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2 Main control Items
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4.2.11 The horizontal ash joint fullness of the old masonry should not be less than 90%, the vertical ash joint fullness should not be less than 80%, and the new version should be changed to the ash joint fullness is not less than 80% :
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4.2.14-4.2.16 New construction quality acceptance content of fire isolation belt, in view of the importance of external insulation fire isolation belt of building external wall in the event of fire, 4.2.14 stipulates that before the construction of external insulation project of external wall constructed with fire isolation belt, special construction plan should be prepared. And shall use the same materials and technology as the special construction scheme to make the fire isolation belt sample wall. 4.2.15 Provisions are made for the composition of materials, products and installation of external insulation and fire isolation belts of building exterior walls. Article 4.2.16 requires its combustion performance grade to be Class A, and provide a type test report.
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5 Curtain wall energy saving project
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1 General Provisions
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5.1.2 In the project of acceptance of concealed works in the construction of energy-saving curtain wall engineering, the anchoring and connection of shading components are added.
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2 Main control Items
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5.2.2 The performance of the materials and components used in the energy-saving project of the curtain wall (including the daylighting top) that need to be reinspected when entering the building increases the sunlight transmission ratio and sunlight reflection ratio of the transparent and semi-transparent sunshade materials.
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6 Energy-saving projects for doors and Windows
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2 Main control Items
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6.2.2 The new version retests different performance according to different climate zones, and increases the retest of the heat transfer coefficient of doors and Windows in cold and cold areas; The old version only gives the building external window air tightness, thermal insulation performance, hollow glass dew point, glass shading coefficient and visible light transmission and other performance ranges.
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7 Roof energy saving project
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1 General Provisions
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7.1.5 Added the provisions of the quality acceptance of the roof energy saving project, the requirements for the division of the inspection batch are specified, which can be divided into one inspection batch per 1000 square meters of area, and can also be determined by the construction unit and the supervision unit through consultation according to the principle of consistent construction process and convenient construction and acceptance.
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2 Main control Items
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The thermal conductivity, density, compressive strength or compressive strength, water absorption, and combustion performance of thermal insulation materials used in the old version 7.2.2 roof energy saving project (except for materials) are classified as one of the properties that need to be retested in the new version 7.2.2, and the solar reflection ratio and hemisphere emissivity of reflective insulation materials are also increased.
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8 Ground energy conservation projects
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1 Main control Project
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8.2.2 The thermal insulation materials used in the ground energy saving project shall not only meet the design requirements for their thermal conductivity or thermal resistance, density, compressive strength or compressive strength, water absorption and combustion performance (except non-combustible materials), but also be retested when entering the site. Incorporates the older versions 8.2.2 and 8.2.3;
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8.2.3 The thermal insulation materials of the basement and the bottom of the overhead floor meet the design requirements and are written into the new version of the specification, and the detailed requirements of the entire ground energy saving project will be more complete.
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3 General Items
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8.3.2 The moisture-proof layer under the insulation layer that touches the soil floor shall meet the design requirements. If the moisture-proof layer here is not properly treated, the moisture insulation layer will reduce the insulation effect.
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9 Heating energy saving project
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1 General Provisions
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9.1.2 Heating energy saving projects should be timely quality inspection in the construction, the old version does not have this requirement, the new version further promotes the quality of heating energy saving projects, and does not ignore or miss the hidden parts caused by construction.
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10 Ventilation and energy saving air conditioning
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1 General Provisions
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10.1.2 It is added in the general provisions that ventilation and air conditioning energy-saving projects should be inspected in time during construction, and the hidden parts should be accepted before hiding.
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2 Main control Items
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10.2.1 Specifications, materials and thickness of finished air ducts are added to the products that need to be checked for technical performance parameters and functions.
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11 Air conditioning and heating system cold and heat source and pipe network energy-saving project
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1 General Provisions
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11.1.2 In the construction of new air-conditioning and heating systems, cold and heat sources and auxiliary equipment, as well as pipelines and outdoor pipe network systems, quality inspection shall be carried out in a timely manner, and acceptance of hidden parts shall be carried out before hiding.
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2 Main control Items
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11.2.1 The specification, material, nominal pressure and applicable temperature of the pipeline are added to the products checked for technical performance parameters and functions; Thermal conductivity, density, thickness and water absorption of thermal insulation materials.
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12 Power distribution and lighting energy saving project
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1 Main control Project
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At present, China's lighting power consumption generally accounts for 10% to 12% of the country's total power generation, for this reason, lighting power saving is of great significance, new mandatory provisions 12.2.2, requiring reinspection of the initial light efficiency of the lighting source, lighting ballast energy efficiency value, lighting efficiency, lighting equipment power, power factors and harmonic content value.
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1 General Items
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Added 12.3.1 The conductor cross section of the power distribution system must not be lower than the design value.
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13 Monitoring and control of energy-saving projects
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17 On-site inspection of building energy conservation projects
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18 Building energy efficiency division project quality acceptance
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Due to the rapid development of building technology and science, the technology of monitoring and controlling energy conservation is also changing with each passing day, so the new version of the standard chapter 13 has changed more than one by one. The new version of the chapter on the field inspection of building energy conservation projects mainly modified the sampling quantity, and the quality acceptance of the construction division almost did not change.
The answer is as follows: GB 50411 is the technical specification of lightning protection for building design in China's national standard, which was published and implemented in 2012 and is still in use. This standard is a new standard, there is no version of the old standard.