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Exergetic performance evaluation and parametric studies of solar air heater

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  • Gupta, M.K.
  • Kaushik, S.C.

Abstract

The present study aims to establish the optimal performance parameters for the maximum exergy delivery during the collection of solar energy in a flat-plate solar air heater. The procedure to determine optimum aspect ratio (length to width ratio of the absorber plate) and optimum duct depth (the distance between the absorber and the bottom plates) for maximum exergy delivery has been developed. It is known that heat energy gain and blower work increase monotonically with mass flow rate, while the temperature of air decreases; therefore, it is desirable to incorporate the quality of heat energy collected and the blower work. First it is proved analytically that the optimum exergy output, neglecting blower work, and the corresponding mass flow rate depend on the inlet temperature of air. The energy and exergy output rates of the solar air heater were evaluated for various values of collector aspect ratio (AR) of the collector, mass flow rate per unit area of the collector plate (G) and solar air heater duct depth (H). Results have been presented to discuss the effects of G, AR and H on the energy and exergy output rates of the solar air heater. The energy output rate increases with G and AR, and decreases with H and the inlet temperature of air. The exergy-based evaluation criterion shows that performance is not a monotonically increasing function of G and AR, and a decreasing function of H and inlet temperature of air. Based on the exergy output rate, it is found that there must be an optimum inlet temperature of air and a corresponding optimum G for any value of AR and H. For values of G lesser than optimal corresponding to inlet temperature of air equals to ambient, higher exergy output rate is achieved for the low value of duct depth and high AR in the range of parameters investigated. If G is high, for an application requiring less temperature increase, then either low AR or high H would give higher exergy output rate.

Suggested Citation

  • Gupta, M.K. & Kaushik, S.C., 2008. "Exergetic performance evaluation and parametric studies of solar air heater," Energy, Elsevier, vol. 33(11), pages 1691-1702.
    • Handle: RePEc:eee:energy:v:33:y:2008:i:11:p:1691-1702
    DOI: 10.1016/j.energy.2008.05.010
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    4. Singh, Sukhmeet & Chander, Subhash & Saini, J.S., 2012. "Exergy based analysis of solar air heater having discrete V-down rib roughness on absorber plate," Energy, Elsevier, vol. 37(1), pages 749-758.
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    8. Alta, D. & Ertekin, C. & Evrendilek, F., 2010. "Quantifying spatio-temporal dynamics of solar radiation exergy over Turkey," Renewable Energy, Elsevier, vol. 35(12), pages 2821-2828.
    9. Le Roux, W.G. & Bello-Ochende, T. & Meyer, J.P., 2012. "Optimum performance of the small-scale open and direct solar thermal Brayton cycle at various environmental conditions and constraints," Energy, Elsevier, vol. 46(1), pages 42-50.
    10. Wang, Teng-yue & Zhao, Yao-hua & Diao, Yan-hua & Ren, Ru-yang & Wang, Ze-yu, 2019. "Performance of a new type of solar air collector with transparent-vacuum glass tube based on micro-heat pipe arrays," Energy, Elsevier, vol. 177(C), pages 16-28.
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    14. Kumar, Vikash, 2021. "Experimental investigation of exergetic efficiency of 3 side concave dimple roughened absorbers," Energy, Elsevier, vol. 215(PB).
    15. Alta, Deniz & Bilgili, Emin & Ertekin, C. & Yaldiz, Osman, 2010. "Experimental investigation of three different solar air heaters: Energy and exergy analyses," Applied Energy, Elsevier, vol. 87(10), pages 2953-2973, October.
    16. Gupta, M.K. & Kaushik, S.C., 2010. "Exergy analysis and investigation for various feed water heaters of direct steam generation solar–thermal power plant," Renewable Energy, Elsevier, vol. 35(6), pages 1228-1235.
    17. 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.
    18. Kumar, Vikash & Murmu, Ramesh, 2021. "Experimental investigation for thermal performance of inclined spherical ball roughened solar air duct," Renewable Energy, Elsevier, vol. 172(C), pages 1365-1392.
    19. Jafarkazemi, Farzad & Ahmadifard, Emad, 2013. "Energetic and exergetic evaluation of flat plate solar collectors," Renewable Energy, Elsevier, vol. 56(C), pages 55-63.
    20. Fudholi, Ahmad & Zohri, Muhammad & Rukman, Nurul Shahirah Binti & Nazri, Nurul Syakirah & Mustapha, Muslizainun & Yen, Chan Hoy & Mohammad, Masita & Sopian, Kamaruzzaman, 2019. "Exergy and sustainability index of photovoltaic thermal (PVT) air collector: A theoretical and experimental study," Renewable and Sustainable Energy Reviews, Elsevier, vol. 100(C), pages 44-51.
    21. Akpinar, Ebru Kavak & Koçyigit, Fatih, 2010. "Energy and exergy analysis of a new flat-plate solar air heater having different obstacles on absorber plates," Applied Energy, Elsevier, vol. 87(11), pages 3438-3450, November.
    22. Muhammad, Mahmud Jamil & Muhammad, Isa Adamu & Sidik, Nor Azwadi Che & Yazid, Muhammad Noor Afiq Witri Muhammad & Mamat, Rizalman & Najafi, G., 2016. "The use of nanofluids for enhancing the thermal performance of stationary solar collectors: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 63(C), pages 226-236.
    23. Rajaseenivasan, T. & Srinivasan, S. & Srithar, K., 2015. "Comprehensive study on solar air heater with circular and V-type turbulators attached on absorber plate," Energy, Elsevier, vol. 88(C), pages 863-873.
    24. A.P. Olalusi & A.S. Ogunlowo & B.O. Bolaji, 2012. "Development and Performance Evaluation of a Mobile Solar Dryer for Cassava Chips," Energy & Environment, , vol. 23(8), pages 1261-1272, December.

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