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Energies 2017, 10(7), 875;

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
Author to whom correspondence should be addressed.
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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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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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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