[Haichuan Architectural Drawing Review] Quick Check on GB55015-2021 Compulsory Regulations and Abolished Provisions

Thread Content

"General Specifications for Building Energy Saving and Renewable Energy Utilization" GB55015-2021 is a full-text mandatory specification. After its implementation, it has replaced relevant mandatory provisions in more than 20 previous standards. Sort out the core changes and differences in typical clauses 1. "Energy-saving Design Standard for Public Buildings" GB 50189-2015 (a total of 17 strong clauses are abolished) Load calculation (3.2.1 vs old 4.1.1): In addition to Class B public buildings, central heating and air conditioning systems must be calculated according to the new regulations. ； The old regulations only require Class A public buildings to calculate electric heating heat sources (3.2.3 vs. old 4.2.2): The new regulation is changed to an affirmative statement "Only when one of the following conditions is met, shall be allowed..." and a new clause is added: “"Process air conditioning system with indoor or work area temperature control accuracy less than 0.5°C or relative humidity control accuracy less than 5%" deleted the clause "When power demand side management encourages electricity use" Boiler thermal efficiency (3.2.5 vs old 4.2.5): The new regulations clarify that the design thermal efficiency of the boiler should not be lower than the value in the table, which is a mandatory indicator. The old regulations describe the temperature and humidity control of the whole air system in a relatively general way (3.2.17 vs. the old 4.3.21): The new regulations mandate that "there should be no simultaneous heating and cooling processes" and the old regulations are "appropriate" equipment control and frequency conversion (3.2.23 vs old 4.3.5, etc.): The new regulations mandate that multiple chiller water pumps should be equipped with unit number control, load-side pumps at all levels should adopt variable frequency speed regulation, and VAV systems should adopt variable frequency regulation. The old regulations mostly refer to "should" or "appropriate" machine room metering (3.2.26 vs old 4.5.2): The new regulations force boiler rooms and cooling and heating motor rooms to measure fuel consumption, total heat supply/cooling capacity, electricity consumption, water replenishment, etc. The old regulations only emphasized overall measurement 2. "Architectural Lighting Design Standard" GB 50034-2013 (a total of 12 strong sections are abolished) Garage lighting power density (3.3.7 vs old 6.3.13): The new regulation compels the LPD limit value of public motor garages to be ≤ 1.9 W/㎡. The target value of the old regulation is ≤ 2.0 W/㎡ lighting energy-saving control (3.3.8 vs. the old 7.3.1): New regulations force corridors, stairwells, foyers, elevator halls and parking garage lighting to be energy-saving and controlled according to demand ； Public lighting areas in large public buildings should be divided, grouped and dimmed according to the old regulations for "suitable" hotel room control (3.3.10 vs old 7.3.3): The new regulations mandate that each guest room (set) should be equipped with a main power supply energy-saving control measure. The old regulation was "energy-saving control type master switch" 3. "Residential Design Code" GB 50096-2011 (a total of 6 strong articles (sections) are abolished) Thermal efficiency of household gas furnaces (3.2.6 vs old 8.3.12): The new regulations clarify that the thermal efficiency of household gas-fired water heaters should not be lower than the value in the given table (corresponding to an energy efficiency level of not less than level 2). The old regulations only require that the central heating load calculation meets the energy efficiency level 3 (3.2.1 vs. the old 8.3.4): The new regulations are extended to "central heating and air conditioning systems" and require cooling load calculations. The old regulations only require centrally heated rooms to be calculated. 4. Energy-saving design standards for residential buildings (JGJ 26-2018 Severe Cold Zone/JGJ 134-2010 Hot Summer and Cold Zone). A large number of thermal performance limits (shape coefficient, window-to-wall ratio, K value, etc.) in these two standards have been abolished, and the unified definitions and indicators have been upgraded to Article 3.1 of the new regulations. In Section (Buildings and Envelope Structures), for example, the average energy saving rate of residential buildings in severe cold areas is set at 75%, and 65% in other climate areas. The new regulations include new requirements for industrial buildings in mild areas, and the mandatory installation of solar systems (5.2.1) for all new buildings. The old regulations did not have such mandatory provisions.