In the high-humidity, hot-summer-cold-winter (HSCW) zone of China, the moisture buffering effect in the envelope is found to be significant in optimum insulation thickness. However, few studies have considered the effects of indoor moisture buffering on the optimum insulation thickness and energy consumption. In this study, we considered the energy load of an exterior wall under moisture transfer from the outdoor to the indoor environment. An optimum insulation thickness was obtained by integrating the P1?P2 model. A residential building was selected for the case study to verify the proposed method. Finally, a comparison was made with two other widely used methods, namely the transient heat transfer model (TH) and the coupled heat and moisture transfer model (CHM). The results indicated that the indoor moisture buffering effect on the optimum insulation thickness is 2.54 times greater than the moisture buffering effect in the envelope, and the two moisture buffering effects make opposing contributions to the optimum insulation thickness. Therefore, when TH or CHM was used without considering the indoor moisture buffering effect, the optimum insulation thickness of the southern wall under one air change per hour (1 ACH) and 100％ normal heat source may be overestimated by 2.13％ to 3. 59％, and the annual energy load on a single wall may be underestimated by 10.10％ to 11.44％. The decrease of airtightness and the increase of indoor heat sources may result in a slight reduction of optimum insulation thickness. This study will enable professionals to consider the effects of moisture buffering on the design of insulation thickness.

Yan-hao FENG;Zi-tao YU;Jiang LU;Xu XU

Institute of Thermal Science and Power Systems,Zhejiang University,Hangzhou 310027,China;State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China;School of Civil Engineering and Architecture,Zhejiang University of Science and Technology,Hangzhou 310023,China;Institute of Energy Engineering,China Jiliang University,Hangzhou 310018,China

浙江大学学报（英文版）（A辑：应用物理和工程）

[1]Yan-hao FENG;Zi-tao YU;Jiang LU;Xu XU-.Optimum insulation thickness of external walls by integrating indoor moisture buffering effect: a case study in the hot-summer-cold-winter zone of China)[J].浙江大学学报（英文版）（A辑：应用物理和工程）,2022(12):998-1012

airtightness

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