I. The main technical contents of this standard revision are as follows:

1. Delete all the mandatory provisions that have been repealed and the provisions already expressed in the current mandatory project construction specifications;

2. Increase the energy-saving design requirements of building curtain wall, daylighting roof and metal roof; Increase the energy-saving design requirements of building equipment management system;

3.Design regulations have been added to building solar photovoltaic utilization, and the installation area ratio of solar energy systems in new buildings has been clarified;

4. Increase the calculation requirements of building energy consumption and carbon emission, and stipulate that the design documents of Class A public buildings should include the annual energy consumption, hourly load of building electricity and carbon emission calculation;

5. The requirements for the overall energy-saving design of the cold source and the energy efficiency of the chiller under non-nominal conditions are put forward;

6. Supplement and update the building natural ventilation, data room, system power transmission heat/cold heat ratio calculation formula, etc.

2. the application of renewable energy, the following provisions are made:

7.1.1 The energy use of public buildings shall give priority to the application of renewable energy through the analysis of local environmental resource conditions and technical economy, combined with relevant national policies.

7.1.2 The renewable energy utilization facilities of public buildings shall be designed simultaneously with the main works.

7.1.3 When the environmental conditions permit and the economy and technology are reasonable, renewable energy such as solar energy and wind energy should be directly connected to the grid for power supply.

7.1.4 When the public power grid cannot provide lighting power, solar energy, wind energy and other power generation and battery configuration should be used as lighting power.

7.1.5 The monitoring and measurement requirements of the renewable energy application system shall comply with the provisions GB55015 in the General Code for Building Energy Conservation and Renewable Energy Utilization, which is the current mandatory engineering construction specification.

Third, the use of solar energy

7.2.1 The utilization of solar energy shall follow the principle of passive priority. Public buildings should be designed to make full use of solar energy.

7.2.2 Public buildings should use photothermal or photovoltaic and building integrated systems; photothermal or photovoltaic and building integrated systems should not affect the building function of the building envelope, and should comply with the relevant provisions of the current national standards.

7.2.3 The following requirements shall be met when the solar system is applied to the new building:

Solar collector area or total installed area of PV modules for Class A public buildings of 1.6-storey and belowIt shall not be less than 20% of the horizontal projection area of the whole roof;

Solar heat collection area or total installed area of photovoltaic modules for public buildings above 2.6 floorsIt should not be less than 15% of the total horizontal projection area of the roof.

7.2.4 In the design stage of solar energy system, the power generation of photovoltaic system and the heat collection of solar heat collection system shall be calculated on a time-by-time basis, and the self-consumption ratio of solar photovoltaic power generation and the guarantee rate of solar heat utilization system shall be obtained throughout the year, and the influence of environmental factors such as incident angle and shadow blocking shall be considered.

7.2.5 When the solar thermal utilization system is installed in public buildings, the solar energy guarantee rate shall comply with the provisions of Table 7.2.5.

7.2.6 The auxiliary heat source of the solar thermal utilization system shall be selected according to the characteristics of building use, heat consumption, energy supply, maintenance and management, sanitation and bacteria prevention and other factors, and low-grade energy such as waste heat and waste heat and other renewable energy such as biomass and geothermal energy should be used.

7.2.7 The solar collectors and photovoltaic modules shall be set to avoid being blocked by themselves or the building body. In the winter solstice daylighting surface sunshine hours, solar collectors should not be less than 4h, photovoltaic modules should not be less than 3h.

7.2.8 Building photovoltaics should be used spontaneously. When the photovoltaic power supply ratio of more than 20% of the single building electricity, it is appropriate to use the DC power distribution system to achieve its local efficient use.The DC power distribution system should be connected to loads such as lighting, charging piles, air conditioners, etc., and have a friendly interface with the power grid.

7.2.9 The supporting parking spaces of public buildings should be equipped with charging piles with adjustable power according to the ratio of 1:1.

IV. Calculation of building energy consumption and carbon emissions

8.1.1 Class A public building design documents shall include the annual energy consumption of the building, the hourly load of building electricity and the calculation of carbon emissions.

8.1.2 The software used for building energy consumption and carbon emission calculation shall have the following functions:

1. Be able to calculate the load formed by the heat transfer, solar radiation heat gain, building internal heat gain and ventilation heat loss of the building envelope (including the thermal bridge part). The influence of building thermal inertia on the load should be considered in the calculation;

2. Can calculate more than 10 building zoning;

3. Can calculate the energy consumption of building heating, ventilation, air conditioning, lighting, domestic hot water, elevator system and the related energy consumption of socket, power and cooking;

4. Be able to calculate the utilization and power generation of renewable energy systems;

5. The monthly average dynamic calculation method is adopted;

6. Can calculate the impact of fresh air heat recovery and air tightness on building energy consumption.