Heating Performance of Solar Building Integrated Wall under Natural Circulation

Xiaohang Shen, Nianping Li, Jiao Lu and Yongga A
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Xiaohang Shen: College of Civil Engineering, Hunan University, Changsha 410082, China
Nianping Li: College of Civil Engineering, Hunan University, Changsha 410082, China
Jiao Lu: School of Civil Engineering and Mechanics, Xiangtan University, Xiangtan City 411105, China
Yongga A: College of Civil Engineering, Hunan University, Changsha 410082, China

Energies, 2020, vol. 13, issue 23, 1-22

Abstract: This paper presented a building façade combined with photothermal technology where a water circulation system, including a thermal radiation plate and a solar collector, was installed. When heated by solar radiation, the water in the system transfered part of the solar heat to the room through natural circulation by buoyancy caused by density difference. During the cold season, the solar heat efficiency of the façade under natural circulation was studied through experiments and numerical simulations. The results show that the simulated values of the model established by MATLAB were in good agreement with the experimental values. Under the action of natural circulation, good solar energy utilization efficiency could be obtained by the façade. When solar irradiance was 1100 W/m 2 , the heat gain of the solar collector was 1672 W, of which the heat delivered to the recycled water and supplied to indoor was 1184 W, and the solar heat efficiency could reach 71%. Both the pipeline impedance and the height difference between radiation plate center and solar collector center had a great influence on temperature change of water supply in this system, whereas had little impact on thermal supply and solar heat efficiency of this system.

Keywords: solar building integration; wall; heating; solar heat efficiency; natural circulation loop (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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