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Numerical investigation of entropy generation in a parabolic trough receiver at different concentration ratios

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

Abstract

This paper presents results of a numerical analysis of entropy generation in a parabolic trough receiver at different concentration ratios, inlet temperatures and flow rates. Using temperature dependent thermal properties of the heat transfer fluid, the entropy generation due to heat transfer across a finite temperature difference and entropy generation due to fluid friction in the receiver has been determined. Results show a reduction in the entropy generation rate as the inlet temperature increases and an increase in the entropy generation rate as the concentration ratio increases. Results further show that, there is an optimal flow rate at which the entropy generated is a minimum, for every combination of concentration ratio and inlet temperature. The optimal flow rates at which the entropy generated is minimum are presented for different flow rate and concentration ratio, and the results are the same irrespective of the inlet temperature considered. For the range of inlet temperatures, flow rates and concentration ratios considered, the Bejan number, which measures the contribution of entropy generation due to heat transfer irreversibility to the total entropy generation rate is about 1 at low flow rates and is between 0 and 0.24 at the highest flow rate.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:53:y:2013:i:c:p:114-127
    DOI: 10.1016/j.energy.2013.03.006
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    References listed on IDEAS

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    3. 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.
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    12. 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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