Analytical and Experimental Study of Recycling Baffled Double-Pass Solar Air Heaters with Attached Fins

Energies

Chii Dong Ho¹  Hsuan Chang²  Rei Chi Wang² 

[1] Energy and Opto-Electronic Materials Research Center, Department of Chemical and Materials Engineering, Tamkang University, Tamsui, New Taipei City 25137, Taiwan;

关键词: heat-transfer efficiency;    double-pass;    solar air heater;    fins attached;    baffles;   

DOI  :  10.3390/en6041821

来源: mdpi

【 摘 要 】

The study of the heat transfer of solar air heaters with a new design using an absorbing plate with fins and baffles, which facilitate the recycling of flowing air, is reported. The mathematical formulation and analytical analysis for such a recyclic baffled double-pass solar air heater were developed theoretically. The performance of the device was studied experimentally as well. The theoretical predicted and experimental results were compared with another design, i.e., a downward-type single-pass solar air heater without recycle and double-pass operations reported in our previous work. Significant improvement in heat-transfer efficiency is achieved with the baffle and fin design due to the recycling heating and the extended heat transfer area. The effects of mass flow rate and recycle ratio on the heat-transfer efficiency enhancement as well as on the power consumption increment are also discussed.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.