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Energies 2018, 11(9), 2402; https://doi.org/10.3390/en11092402

The Thermal Behavior of a Dual-Function Solar Collector Integrated with Building: An Experimental and Numerical Study on the Air Heating Mode

1
School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China
2
Department of Architecture and Built Environment, University of Nottingham, Nottingham NG7 2RD, UK
3
Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230026, China
4
Department of Building Environment and Equipment, Hefei University of Technology, Hefei 230009, China
5
Anhui Province Key Laboratory of Intelligent Building & Building Energy Saving, Hefei 230601, China
*
Author to whom correspondence should be addressed.
Received: 20 August 2018 / Revised: 7 September 2018 / Accepted: 10 September 2018 / Published: 11 September 2018
(This article belongs to the Special Issue Solar Thermal Energy Utilization Technologies in Buildings)
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Abstract

This paper presented a novel solar collector that can work in air or water heating mode depending on the seasonal requirement. The dual-function solar collector (DFSC) integrated with a building as well as a reference building without the DFSC were built to test thermal behavior in passive air heating mode during winter. The buildings were equipped with an apparatus to control the room temperature. During the testing procedure, experimental study on the DFSC system was carried out under two conditions, where the indoor temperature was controlled and non-controlled. The results showed that the average temperature of the test room was about 3.43 °C higher than that of the reference room under the non-controlled condition. When the room temperature was controlled at 18 °C, the power consumptions of the test room and reference room were 4.322 kWh and 7.796 kWh, respectively. Consequently, the corresponding daily power consumption saved could reach up to around 3.5 kWh. Moreover, a dynamic numerical model on the DFSC along with the building was developed taking the fin effect of the Cu-tubes into account. The numerical results are found to be well consistent with the measured data. A parametric study on with/without Cu-tubes and depth of the air channel was carried out. It is found that the existing Cu-tubes functioning as water heating can enhance the air heating efficiency when the depth of air channel is of a suitable size. View Full-Text
Keywords: flat plate solar collector; dual-function; passive air heating; numerical modeling flat plate solar collector; dual-function; passive air heating; numerical modeling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Ma, J.; Zhao, Q.; Su, Y.; Ji, J.; He, W.; Hu, Z.; Fang, T.; Wang, H. The Thermal Behavior of a Dual-Function Solar Collector Integrated with Building: An Experimental and Numerical Study on the Air Heating Mode. Energies 2018, 11, 2402.

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