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Heat loss of a trapezoidal cavity absorber for a linear Fresnel reflecting solar concentrator

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  • Flores Larsen, S.
  • Altamirano, M.
  • Hernández, A.

Abstract

The present paper studies the heat loss of a linear absorber with a trapezoidal cavity and a set of pipes used for a linear Fresnel reflecting solar concentrator. The study includes the measurements on a 1.4 m long prototype installed in a laboratory, and its thermal simulation in steady-state using EnergyPlus software. Results of the measured vertical temperature variation inside the cavity, the surface interior and exterior wall and window temperatures, the global heat loss at steady-state and the heat loss coefficients, are presented for six different temperatures of the pipes. Measurements revealed a stable thermal gradient in the upper portion of the cavity and a convective zone below it. Around 91% of the heat transferred to outdoors occurs at the bottom transparent window, for a pipe temperature of 200 °C. The heat loss coefficient per area of absorbing pipes ranged from 3.39 W/m2K to 6.35 W/m2K (for 110 °C < Tpipe < 285 °C), and it increased with the increase of Tpipe. Simpler and less time-consuming available free software originally designed for heat transfer in buildings was tested to be a possible replacement of the highly complex CFD software commonly used to simulate the steady-state heat loss of the absorber. The experimental and predicted data sets were found to be in good agreement.

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  • 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.
    • Handle: RePEc:eee:renene:v:39:y:2012:i:1:p:198-206
    DOI: 10.1016/j.renene.2011.08.003
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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.
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    3. 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.
    4. Facão, Jorge & Oliveira, Armando C., 2011. "Numerical simulation of a trapezoidal cavity receiver for a linear Fresnel solar collector concentrator," Renewable Energy, Elsevier, vol. 36(1), pages 90-96.
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    5. Dellicompagni, Pablo & Franco, Judith, 2019. "Potential uses of a prototype linear Fresnel concentration system," Renewable Energy, Elsevier, vol. 136(C), pages 1044-1054.
    6. 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.
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    9. 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.
    10. 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.
    11. 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.
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    13. 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.
    14. Mishra, Prashant & Pandey, Mukesh & Tamaura, Yutaka & Tiwari, Sumit, 2021. "Numerical analysis of cavity receiver with parallel tubes for cross-linear concentrated solar system," Energy, Elsevier, vol. 220(C).
    15. 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.
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