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On-line Access: 2023-01-11

Received: 2022-03-26

Revision Accepted: 2022-07-04

Crosschecked: 2023-01-13

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Yan-hao FENG


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Journal of Zhejiang University SCIENCE A 2022 Vol.23 No.12 P.998-1012


Optimum insulation thickness of external walls by integrating indoor moisture buffering effect: a case study in the hot-summer-cold-winter zone of China

Author(s):  Yan-hao FENG, Zi-tao YU, Jiang LU, Xu XU

Affiliation(s):  Institute of Thermal Science and Power Systems, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   yuzitao@zju.edu.cn

Key Words:  Insulation thickness optimization, Coupled heat and moisture transfer, Indoor moisture buffering effect, Exterior wall, Lifecycle cost

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]. Journal of Zhejiang University Science A, 2022, 23(12): 998-1012.

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author="Yan-hao FENG, Zi-tao YU, Jiang LU, Xu XU",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

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%T Optimum insulation thickness of external walls by integrating indoor moisture buffering effect: a case study in the hot-summer-cold-winter zone of China
%A Yan-hao FENG
%A Zi-tao YU
%A Jiang LU
%A Xu XU
%J Journal of Zhejiang University SCIENCE A
%V 23
%N 12
%P 998-1012
%@ 1673-565X
%D 2022
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2200158

T1 - Optimum insulation thickness of external walls by integrating indoor moisture buffering effect: a case study in the hot-summer-cold-winter zone of China
A1 - Yan-hao FENG
A1 - Zi-tao YU
A1 - Jiang LU
A1 - Xu XU
J0 - Journal of Zhejiang University Science A
VL - 23
IS - 12
SP - 998
EP - 1012
%@ 1673-565X
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A2200158

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 P1P2 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.


结论:1.室内湿缓冲效应对最佳保温层厚度的影响是围护结构外墙中湿缓冲效应的2.54倍,而且这两种湿缓冲效应对最佳保温厚度的贡献相反。2.在每小时换气一次(1 ACH)和100%正常热源条件下,南墙的最佳保温厚度可能被高估了2.13%~3.59%,而单面墙的年能量负荷可能被低估了10.10%~11.44%;在同属夏热冬冷地区的不同城市中,外墙湿缓冲的影响差异较大。3.气密性的降低和室内热源的增加会导致最佳保温厚度的轻微降低。


Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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