空调间歇运行模式下外墙内外保温的能耗特性对比

Comparative Assessment of External and Internal Insulation for Energy Conservation of Intermittent Air-Conditioned Buildings

摘要:

采用数值计算的方法，对比了不同使用时间段的建筑物在不同空调运行方式以及不同热源强度条件下分别采用外墙外保温和外墙内保温两种保温形式时的能耗特性.结果表明，对于白天使用的建筑物，采用外墙外保温更有利于降低建筑物的空调能耗.对于夜间使用的建筑物，若空调器在使用时间段内持续运行，采用外墙内保温更有利于降低建筑物的空调能耗；而在使用时间段内利用建筑物的蓄冷，空调器间歇运行时，则需评估建筑物热源的大小以确定外墙保温形式.适宜的外墙保温形式的选取应当综合考虑建筑物的使用时间段、空调器的运行方式以及建筑物热源强度三方面的因素.

Abstract:

A comparative assessment of the external and internal insulation for an intermittent air-conditioned building was numerically performed. The energy consumed for cooling was used to evaluate the insulation configurations of exterior walls. There was concern about the effect of the periods that the building was occupied, the air conditioner (AC) operation modes and the power of the heat source in this study. The results show that the external insulation configuration have a better thermal performance compared to the internal insulation configuration, when the building was occupied at daytime. When the building was occupied at night, the internal insulation configuration have a better thermal performance if the AC runs continuously. If the cold storage of the building was applied for energy conservation, the power of the heat source should be considered to determine the insulation configuration. The determination of the insulation configuration of the exterior walls should take those three factors into consideration, including the occupancy time of the building, the AC operation modes, and the power of the heat source.