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Heat loss characteristics study of a trapezoidal cavity absorber with and without plate for a linear Fresnel reflector solar concentrator system

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  • Manikumar, R.
  • Valan Arasu, A.

Abstract

The numerical and experimental studies are conducted to analyze the heat loss in the cavity absorbers of linear Fresnel reflecting solar concentrator (LFRSC). The cavity is trapezoidal shape in cross section, which is placed at focus of the concentrator, has multiple tubes and water is used as the working fluid. The upper surface of the cavity has two models; with copper plate, above which absorber tubes are placed together and without copper plate i.e. absorber tubes alone without copper plate underneath. In both the models, the heat loss coefficient of projected absorber surfaces is analyzed with and without black chrome coating. For the numerical simulation of the trapezoidal cavity absorber, ANSYS FLUENT 12.0 version is used to develop the two dimensional model with non-Boussinesq numerical approximation. For the experimental study, two cavity absorbers are designed for operating in conjunction with a LFRSC experimental set up for the area of 4.0 m2. The overall heat loss coefficients are also estimated analytically by cavity correlations. The trend of variation of estimated heat loss coefficient by both methods is similar to experimental values. Also, estimated values by numerical study are very close to analytical and experimental values and the numerical model can be used for further analysis.

Suggested Citation

  • Manikumar, R. & Valan Arasu, A., 2014. "Heat loss characteristics study of a trapezoidal cavity absorber with and without plate for a linear Fresnel reflector solar concentrator system," Renewable Energy, Elsevier, vol. 63(C), pages 98-108.
    • Handle: RePEc:eee:renene:v:63:y:2014:i:c:p:98-108
    DOI: 10.1016/j.renene.2013.09.005
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    References listed on IDEAS

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    1. Sharma, M. S. & Mathur, S. S. & Singh, R. N., 1983. "Performance analysis of a linear solar concentrator under different flow regimes," Applied Energy, Elsevier, vol. 13(1), pages 77-81, January.
    2. Singh, Panna Lal & Sarviya, R.M. & Bhagoria, J.L., 2010. "Thermal performance of linear Fresnel reflecting solar concentrator with trapezoidal cavity absorbers," Applied Energy, Elsevier, vol. 87(2), pages 541-550, February.
    3. Natarajan, Sendhil Kumar & Reddy, K.S. & Mallick, Tapas Kumar, 2012. "Heat loss characteristics of trapezoidal cavity receiver for solar linear concentrating system," Applied Energy, Elsevier, vol. 93(C), pages 523-531.
    4. 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. Sharaf, Omar Z. & Orhan, Mehmet F., 2015. "Concentrated photovoltaic thermal (CPVT) solar collector systems: Part I – Fundamentals, design considerations and current technologies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 50(C), pages 1500-1565.
    2. 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.
    3. 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.
    4. Cheng, Ze-Dong & Zhao, Xue-Ru & He, Ya-Ling & Qiu, Yu, 2018. "A novel optical optimization model for linear Fresnel reflector concentrators," Renewable Energy, Elsevier, vol. 129(PA), pages 486-499.

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