Building envelope trade-off option is the way that through calculating and comparing the annual heating and air-conditioning energy consumption of the design building and the reference building, then judging whether the overall thermal performance of building envelope is up to the design standard of energy efficiency , lastly, the energy efficiency design parameter of building thermal can be decided. Two types building are almost the same except in the design parameter of building thermal,but they ought to adopt the same efficiency of air-conditioning and heating system, therefore the trade-off option can use the load as a criterion instead of using energy consumption. As compared with trade-off based on energy consumption, to use the trade-off based on load can directly appraise the overall thermal performance state of building envelope, thus energy efficiency property of the building thermal design can be directly judged.%围护结构热工性能权衡判断法就是通过计算比较设计建筑和参照建筑的全年采暖空调能耗,来判定围护结构的总体热工性能是否达到节能设计要求,以便确定建筑热工节能设计参数的方法.两种建筑仅在建筑热工设计参数方面有所不同,而在空调采暖系统效率方面应当相同,据此就可以用负荷来代替能耗作为权衡判断法的判据.与权衡能耗法相比,采用权衡负荷法能够直接对围护结构的总体热工性能状况进行优劣评价,从而可以直接判定建筑热工设计的节能性.
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