Experiment and numerical simulation of an adaptive building roof combining variable transparency shape-stabilized PCM

被引：34
作者：
Wang, Pengcheng [1 ,2 ]
Liu, Zhongbing [1 ,2 ]
Xi, Sitan [1 ,2 ]
Zhang, Yichi [1 ,2 ]
Zhang, Ling [1 ,2 ]
机构：
[1] Hunan Univ, Coll Civil Engn, Changsha 410082, Hunan, Peoples R China
[2] Hunan Univ, Key Lab Bldg Safety & Energy Efficiency, Minist Educ, Changsha 410082, Hunan, Peoples R China
来源：
ENERGY AND BUILDINGS | 2022年 / 263卷
基金：
中国国家自然科学基金;
关键词：
Adaptive building roof; Variable transparency PCM; Time-space effect; Energy performance; Sensitivity analysis; Monte; -Carlo; PHASE-CHANGE MATERIALS; SENSITIVITY-ANALYSIS; OPTICAL-PERFORMANCE; ENERGY PERFORMANCE; GLAZED ROOF; PARAMETERS; DESIGN; MODEL; LAYER; FILMS;
D O I：
10.1016/j.enbuild.2022.112030
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Adaptive building envelopes with advanced optical materials have received much attention as they can actively regulate solar heat gain. In present work, an adaptive building roof (ABR) combining variable transparency shape-stabilized PCM (VTSS-PCM) was proposed. A numerical model was developed firstly for dealing with time-space effect of radiation properties of VTSS-PCM and validated by experiments. The difference in performance between ABR and the common insulation roof was simulated. Then, a global sensitivity analysis based on the Monte-Carlo method was conducted to determine key parameters among 22 system parameters. Finally, the influences of key parameters on the performance of ABR were studied in detail. The results show that the ABR can reduce the heat gain by 35.25 % compared with the common insulation roof. The thickness of VTSS-PCM, the extinction coefficient of VTSS-PCM in the transparent state, and the albedo of reflective film are three key parameters. The thickness of the VTSS-PCM layer and the extinction coefficient of VTSS-PCM in the transparent state have positive correlations with the heat gain, whereas the albedo of the reflective film has a negative correlation with the heat gain. The time-space effect of radiation properties of VTSS-PCM during the phase change causes the solar absorptance of ABR to be unstable. This research guides the modeling of VTSS-PCM and facilitates the application of ABR. (C) 2022 Elsevier B.V. All rights reserved.
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页数：13
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