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Energies 2017, 10(7), 875; doi:10.3390/en10070875

Efficiency of Recycling Double-Pass V-Corrugated Solar Air Collectors

Energy and Opto-Electronic Materials Research Center, Department of Chemical and Materials Engineering, Tamkang University, Tamsui, New Taipei 251, Taiwan
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Received: 31 May 2017 / Accepted: 26 June 2017 / Published: 29 June 2017
(This article belongs to the Section Energy Storage and Application)
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Abstract

The influence of recycling on double-pass solar air collectors with welding of the V-corrugated absorber has been studied experimentally and theoretically. Welding the V-corrugated absorber and the recycle-effect concept to the solar air collector was proposed to strengthen the convective heat-transfer coefficient due to turbulence promotion. Both the recycle effect and the V-corrugated absorber can effectively enhance the heat transfer efficiency compared to various designs such as single-pass, flat-plate double-pass, and double-pass wire mesh packed devices. Recycling operations and welding the V-corrugated absorber could enhance the collector efficiency by increasing the recycle ratio, incident solar radiations, and air mass flow rates. The most efficient and economical operating conditions were found at R ≈ 0.5, with relatively small hydraulic dissipated energy compensation. It was found that the turbulence intensity increase from welding the V-corrugated absorber into the solar air collector channel could compensate for the power consumption increase, when considering economic feasibility. View Full-Text
Keywords: solar air heater; V-corrugated absorber; recycle effect; heat-transfer efficiency; double-pass operation solar air heater; V-corrugated absorber; recycle effect; heat-transfer efficiency; double-pass operation
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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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MDPI and ACS Style

Ho, C.-D.; Hsiao, C.-F.; Chang, H.; Tien, Y.-E.; Hong, Z.-S. Efficiency of Recycling Double-Pass V-Corrugated Solar Air Collectors. Energies 2017, 10, 875.

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