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Minimum entropy generation due to heat transfer and fluid friction in a parabolic trough receiver with non-uniform heat flux at different rim angles and concentration ratios

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  • Mwesigye, Aggrey
  • Bello-Ochende, Tunde
  • Meyer, Josua P.

Abstract

In this paper, Monte Carlo ray-tracing and computational fluid dynamics are used to numerically investigate the minimum entropy generation due to heat transfer and fluid friction in a parabolic trough receiver. The analysis was carried out for rim angles in the range 40°–120°, concentration ratios in the range 57–143, Reynolds numbers in the range 1.02 × 104–1.36 × 106 and fluid temperatures in the range 350–650 K. Results show existence of an optimal Reynolds number at any given combination of fluid temperature, concentration ratio and rim angle for which the total entropy generation is a minimum. The total entropy generation was found to increase as the rim angle reduced, concentration ratio increased and fluid temperature reduced. The high entropy generation rates at low rim angles are mainly due to high peak temperatures in the absorber tube at these low rim angles.

Suggested Citation

  • Mwesigye, Aggrey & Bello-Ochende, Tunde & Meyer, Josua P., 2014. "Minimum entropy generation due to heat transfer and fluid friction in a parabolic trough receiver with non-uniform heat flux at different rim angles and concentration ratios," Energy, Elsevier, vol. 73(C), pages 606-617.
    • Handle: RePEc:eee:energy:v:73:y:2014:i:c:p:606-617
    DOI: 10.1016/j.energy.2014.06.063
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    References listed on IDEAS

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    1. Mwesigye, Aggrey & Bello-Ochende, Tunde & Meyer, Josua P., 2013. "Numerical investigation of entropy generation in a parabolic trough receiver at different concentration ratios," Energy, Elsevier, vol. 53(C), pages 114-127.
    2. Baloyi, J. & Bello-Ochende, T. & Meyer, J.P., 2014. "Thermodynamic optimisation and computational analysis of irreversibilities in a small-scale wood-fired circulating fluidised bed adiabatic combustor," Energy, Elsevier, vol. 70(C), pages 653-663.
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    5. He, Ya-Ling & Xiao, Jie & Cheng, Ze-Dong & Tao, Yu-Bing, 2011. "A MCRT and FVM coupled simulation method for energy conversion process in parabolic trough solar collector," Renewable Energy, Elsevier, vol. 36(3), pages 976-985.
    6. Le Roux, W.G. & Bello-Ochende, T. & Meyer, J.P., 2011. "Operating conditions of an open and direct solar thermal Brayton cycle with optimised cavity receiver and recuperator," Energy, Elsevier, vol. 36(10), pages 6027-6036.
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