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Energies 2018, 11(2), 338; doi:10.3390/en11020338

Device Performance Improvement of Recycling Double-Pass Cross-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: 28 December 2017 / Revised: 24 January 2018 / Accepted: 24 January 2018 / Published: 2 February 2018
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The device performance of cross-corrugated double-pass solar air heaters under external recycle conditions was investigated experimentally and theoretically, and solved numerically using the Newton method. Comparisons were made and represented graphically among three different configurations of the single-pass, flat-plate double-pass and cross-corrugated double-pass devices. Air flowing simultaneously over the wavelike corrugated absorbing plate and in-between both wavelike cross-corrugated absorbing and transverse bottom plates was conducted under double-pass operations. A considerable heat-transfer efficiency enhancement is obtained employing such a recycling double pass device with welding cross-corrugated absorbing plates, instead of using the flat-plate device. An effective thermal performance was achieved because the heat transfer area is doubled and the turbulent intensity is enhanced as well. The power consumption increment owing to the reduction in the cross-sectional area was taken into account associated with the heat-transfer efficiency enhancement for comparisons in determining the optimal design on an economic consideration for the recycling cross-corrugated double-pass device. View Full-Text
Keywords: heat-transfer efficiency; double-pass; solar air heater; recycle; cross-corrugated flow channel heat-transfer efficiency; double-pass; solar air heater; recycle; cross-corrugated flow channel

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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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Ho, C.-D.; Chang, H.; Hsiao, C.-F.; Huang, C.-C. Device Performance Improvement of Recycling Double-Pass Cross-Corrugated Solar Air Collectors. Energies 2018, 11, 338.

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