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Effect of flow maldistribution on thermal performance of a solar air heater array with subcollectors in parallel

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  • Karwa, Rajendra
  • Karwa, Nitin
  • Misra, Rohit
  • Agarwal, P.C.

Abstract

This paper presents results of a theoretical study carried out to investigate the effect of flow maldistribution, caused by the manufacturing imperfections and tolerances, on the thermal efficiency of a solar air heater array with subcollectors in parallel. The air mass flow rate, ambient temperature, solar insolation and wind heat transfer coefficient have been systematically varied to study the effect under a wide range of these parameters. The collector length, duct height, and plate emissivity were also changed to study their effect. It has been found that the maximum reduction in thermal efficiency due to flow maldistribution is less than about 3% for an array with a commercial grade finish of duct surfaces and ±10% manufacturing tolerance for the duct height.

Suggested Citation

  • Karwa, Rajendra & Karwa, Nitin & Misra, Rohit & Agarwal, P.C., 2007. "Effect of flow maldistribution on thermal performance of a solar air heater array with subcollectors in parallel," Energy, Elsevier, vol. 32(7), pages 1260-1270.
    • Handle: RePEc:eee:energy:v:32:y:2007:i:7:p:1260-1270
    DOI: 10.1016/j.energy.2006.08.002
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    References listed on IDEAS

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    1. Karwa, Rajendra & Garg, S.N. & Arya, A.K., 2002. "Thermo-hydraulic performance of a solar air heater with n-subcollectors in series and parallel configuration," Energy, Elsevier, vol. 27(9), pages 807-812.
    2. Yeh, Ho-Ming & Lin, Tong-Tshien, 1997. "Solar air heaters with two collectors in series," Energy, Elsevier, vol. 22(9), pages 933-936.
    3. Karwa, Rajendra & Solanki, S.C & Saini, J.S, 2001. "Thermo-hydraulic performance of solar air heaters having integral chamfered rib roughness on absorber plates," Energy, Elsevier, vol. 26(2), pages 161-176.
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    Cited by:

    1. Karwa, Rajendra & Chauhan, Kalpana, 2010. "Performance evaluation of solar air heaters having v-down discrete rib roughness on the absorber plate," Energy, Elsevier, vol. 35(1), pages 398-409.
    2. Singh, Sanjay Kumar & Mishra, Manish & Jha, P.K., 2014. "Nonuniformities in compact heat exchangers—scope for better energy utilization: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 40(C), pages 583-596.
    3. Wei, Min & Fan, Yilin & Luo, Lingai & Flamant, Gilles, 2017. "Design and optimization of baffled fluid distributor for realizing target flow distribution in a tubular solar receiver," Energy, Elsevier, vol. 136(C), pages 126-134.
    4. Karwa, Rajendra & Chitoshiya, Girish, 2013. "Performance study of solar air heater having v-down discrete ribs on absorber plate," Energy, Elsevier, vol. 55(C), pages 939-955.
    5. 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.
    6. Siddiqui, Osman K. & Zubair, Syed M., 2017. "Efficient energy utilization through proper design of microchannel heat exchanger manifolds: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 74(C), pages 969-1002.
    7. Oztop, Hakan F. & Bayrak, Fatih & Hepbasli, Arif, 2013. "Energetic and exergetic aspects of solar air heating (solar collector) systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 21(C), pages 59-83.
    8. Singh, Satyender & Dhiman, Prashant, 2016. "Thermal performance of double pass packed bed solar air heaters – A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 53(C), pages 1010-1031.

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