Home / Standards / GB/T 20311-2021 GB/T 20311-2021 Active Building components and building elements—Thermal resistance and thermal transmittance—Calculation methods 建筑构件和建筑单元 热阻和传热系数 计算方法 Standard Type GBT ICS 91.120.10 CCS Q25 Status 现行 Issue Date 2021-08-20 Implementation 2022-03-01 Responsible Dept 中国建筑材料联合会 Drafting Unit N/A