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Experimental investigation and computational validation of heat losses from the cavity receiver used in linear Fresnel reflector solar thermal system

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  • Sahoo, Sudhansu S.
  • Varghese, Shinu M.
  • Suresh Kumar, C.
  • Viswanathan, S.P.
  • Singh, Suneet
  • Banerjee, Rangan

Abstract

This paper presents the analysis of heat losses from the trapezoidal cavity receiver used in linear Fresnel reflector (LFR) system. The experimental studies are conducted under laboratory conditions that are specially designed for this purpose. The effects of parameters such as the temperatures of the tube surface, depth of receiver, number of tubes, and emissivity of tubes are investigated. The loss of heat is taking place from the tube outer surface to glass cover, below the receiver and then glass cover to ambient. As part of this investigation, the system is modelled and simulated using computational fluid dynamics (CFD). After validation, contribution of convection and radiation to the total heat transfer are found out using CFD. Computational predictions are shown to be consistent with the experimental observations which show that the CFD model is a reliable tool for predicting heat loss and overall heat loss coefficient. It was found that losses due to convection are between 5 and 18% of the total heat losses.

Suggested Citation

  • Sahoo, Sudhansu S. & Varghese, Shinu M. & Suresh Kumar, C. & Viswanathan, S.P. & Singh, Suneet & Banerjee, Rangan, 2013. "Experimental investigation and computational validation of heat losses from the cavity receiver used in linear Fresnel reflector solar thermal system," Renewable Energy, Elsevier, vol. 55(C), pages 18-23.
    • Handle: RePEc:eee:renene:v:55:y:2013:i:c:p:18-23
    DOI: 10.1016/j.renene.2012.11.036
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    References listed on IDEAS

    as
    1. Flores Larsen, S. & Altamirano, M. & Hernández, A., 2012. "Heat loss of a trapezoidal cavity absorber for a linear Fresnel reflecting solar concentrator," Renewable Energy, Elsevier, vol. 39(1), pages 198-206.
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    Cited by:

    1. Sahoo, Sudhansu S. & Singh, Suneet & Banerjee, Rangan, 2016. "Thermal hydraulic simulation of absorber tubes in linear Fresnel reflector solar thermal system using RELAP," Renewable Energy, Elsevier, vol. 86(C), pages 507-516.
    2. Awasthi, Kuldeep & Khan, Mohd Kaleem, 2019. "Performance evaluation of coiled tube receiver cavity for a concentrating collector," Renewable Energy, Elsevier, vol. 138(C), pages 666-674.
    3. Karimi, Reza & Gheinani, Touraj Tavakoli & Madadi Avargani, Vahid, 2018. "A detailed mathematical model for thermal performance analysis of a cylindrical cavity receiver in a solar parabolic dish collector system," Renewable Energy, Elsevier, vol. 125(C), pages 768-782.
    4. Hongn, Marcos & Flores Larsen, Silvana, 2018. "Hydrothermal model for small-scale linear Fresnel absorbers with non-uniform stepwise solar distribution," Applied Energy, Elsevier, vol. 223(C), pages 329-346.
    5. Reddy, K.S. & Balaji, Shanmugapriya & Sundararajan, T., 2018. "Estimation of heat losses due to wind effects from linear parabolic secondary reflector –receiver of solar LFR module," Energy, Elsevier, vol. 150(C), pages 410-433.
    6. Abbas, R. & Martínez-Val, J.M., 2015. "Analytic optical design of linear Fresnel collectors with variable widths and shifts of mirrors," Renewable Energy, Elsevier, vol. 75(C), pages 81-92.
    7. Qiu, Yu & He, Ya-Ling & Wu, Ming & Zheng, Zhang-Jing, 2016. "A comprehensive model for optical and thermal characterization of a linear Fresnel solar reflector with a trapezoidal cavity receiver," Renewable Energy, Elsevier, vol. 97(C), pages 129-144.
    8. Andrade, L.A. & Barrozo, M.A.S. & Vieira, L.G.M., 2016. "A study on dynamic heating in solar dish concentrators," Renewable Energy, Elsevier, vol. 87(P1), pages 501-508.

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