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Theoretical analysis on a new finned type solar air heater

Author

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  • Garg, H.P.
  • Jha, Ranjana
  • Choudhury, C.
  • Datta, Gouri

Abstract

This paper deals with efforts to improve the performance of conventional, duct- type air heaters by providing rectangular fins in the air passage between the absorber and the rear plate. For this configuration, a mathematical model is developed by writing the energy balance equations at various interfaces of the system. Numerical simulation of this theoretical model is carried out in order to evaluate the effect of the number of rectangular fins, the length of the fins (equal to the length of the plates), the depth of the air channel, the air flow rate, etc. on the thermal performance of the air heater. These results are then compared with data for a conventional air heater with the same duct depth and length. The outlet air temperature and hence the total heat energy collected are found to increase with an increase in the number of fins and with a decrease in the duct depth, while all other design and operational parameters are kept constant. The shallower duch depth improves the thermal performance of the air heater but also increases the pressure drop, thereby increasing the energy expended in pumping the air through the collector. To account for this expended energy, the new term effective heat gain is introduced and computed separately for different cases.

Suggested Citation

  • Garg, H.P. & Jha, Ranjana & Choudhury, C. & Datta, Gouri, 1991. "Theoretical analysis on a new finned type solar air heater," Energy, Elsevier, vol. 16(10), pages 1231-1238.
    • Handle: RePEc:eee:energy:v:16:y:1991:i:10:p:1231-1238
    DOI: 10.1016/0360-5442(91)90152-C
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    Cited by:

    1. Kumar, Rajesh & Chand, Prabha, 2017. "Performance enhancement of solar air heater using herringbone corrugated fins," Energy, Elsevier, vol. 127(C), pages 271-279.
    2. Saxena, Abhishek & Varun, & El-Sebaii, A.A., 2015. "A thermodynamic review of solar air heaters," Renewable and Sustainable Energy Reviews, Elsevier, vol. 43(C), pages 863-890.
    3. Harmim, A. & Belhamel, M. & Boukar, M. & Amar, M., 2010. "Experimental investigation of a box-type solar cooker with a finned absorber plate," Energy, Elsevier, vol. 35(9), pages 3799-3802.
    4. Velmurugan, V. & Naveen Kumar, K.J. & Noorul Haq, T. & Srithar, K., 2009. "Performance analysis in stepped solar still for effluent desalination," Energy, Elsevier, vol. 34(9), pages 1179-1186.
    5. Amir Hematian & Yahya Ajabshehichi & Hossein Behfar & Hessamoddin Ghahramani, 2012. "Designing, Construction and Analysis of Speed Control System of the Fan with PV Feeding Source in an Air Solar Collector," Modern Applied Science, Canadian Center of Science and Education, vol. 6(1), pages 136-136, January.
    6. Al-Nimr, M.A. & Damseh, R.A., 1998. "Dynamic behaviour of baffled solar air heaters," Renewable Energy, Elsevier, vol. 13(2), pages 153-163.

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