Dynamic heat preservation at night for a Trombe wall with a built-in panel curtain in Western China.

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Date: Jan. 1, 2021
From: Solar Energy(Vol. 213)
Publisher: Elsevier Science Publishers
Document Type: Report
Length: 426 words

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Abstract :

Keywords Trombe walls; Insulation inside the cavity; Air cavity; Heat preservation; Western China Highlights * Heat transfer characteristics of closed and circulated air cavities are obtained. * Design of insulation inside the cavity is proposed for a TW in Western China. * Indoor thermal environment of a CTW room is analyzed. Abstract Integrating the design of insulation, heat storage, and solar heating can help to improve indoor thermal environment during winter in Western China. However, insulation at night is often overlooked for Trombe walls (TWs). The present study considers a panel curtain installed in the cavity to enhance the preservation of heat of TWs at night. The effects of the structural parameters related to insulation inside the cavity on the TWs were analyzed in Western China and a design approach for insulation inside the cavity was proposed. In addition, the indoor air temperature of a TW with a built-in panel curtain (CTW) room was analyzed. The results indicate that the heat efficiency in the nighttime can be significantly improved by setting a panel curtain in the air cavity. Low emissivity film should be attached to the closed cavity side. The emissivity of the panel curtain's exterior surface plays an important role in the closed cavity and the effect is more significant with low emissivity. The optimum thickness depends on the climate, i.e., 0.02--0.06 m for a large solar radiant heat loss ratio (SHLR), 0.02--0.05 m for a medium SHLR, and 0.02--0.04 m for a low SHLR. The thickness of the circulated cavity should be larger than 0.07 m, and the effect varies within a small range when the thickness exceeds 0.1 m. A panel curtain can significantly improve the indoor air temperature in a CTW room. Author Affiliation: (a) State Key Laboratory of Green Building in Western China, Xi'an, Shaanxi 710055, PR China (b) School of Architecture, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, PR China (c) Yuzhong Solar Heating and Cooling Demonstration Base, Gansu Institute of Natural Energy, Lanzhou, Gansu 730000, PR China (d) Building Environment and Energy Conservation Design Research Center, China Southwest Architectural Design and Research Institute Corp., Ltd., Chengdu, Sichuan 610000, PR China * Corresponding authors at: State Key Laboratory of Green Building in Western China, Xi'an, Shaanxi 710055, PR China. School of Architecture, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, PR China. Article History: Received 16 August 2020; Revised 15 October 2020; Accepted 29 October 2020 Byline: Liqiang Hou (a,b), Yan Liu [liuyan@xauat.edu.cn] (a,b,*), Tang Liu (a,b), Liu Yang [yangliu@xauat.edu.cn] (a,b,*), Yinping Feng (c), Qinglong Gao (d)

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Gale Document Number: GALE|A648932518