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Optimal thermal and thermodynamic performance of a solar parabolic trough receiver with different nanofluids and at different concentration ratios

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  • Mwesigye, Aggrey
  • Meyer, Josua P.

Abstract

In this paper, the optimum thermal and thermodynamic operating conditions of a parabolic trough solar energy system working with copper-Therminol®VP-1, silver-Therminol®VP-1 and Al2O3-Therminol®VP-1 nanofluids as heat transfer fluids were investigated. Moreover, the influence of increasing concentration ratios on the thermal and thermodynamic optimum conditions was considered for concentration ratios between 88 and 113. To obtain the system’s precise thermal and thermodynamic performance, a well-validated numerical model, with a typical heat flux profile on the outer wall of the receiver’s absorber tube, was developed using a finite volume based computational fluid dynamics tool together with Monte Carlo ray tracing. Results show that silver-Therminol®VP-1 nanofluid gives the highest thermal performance owing to its comparatively better thermal transport properties, whereas Al2O3-Therminol®VP-1 showed the lowest thermal performance. Given the increase in the useful energy gain from the collector with heat transfer enhancement, the thermal efficiency was shown to increase by 13.9%, 12.5% and 7.2% for silver-Therminol®VP-1, copper-Therminol®VP-1 and Al2O3-Therminol®VP-1, respectively when the concentration ratio is 113. With increasing concentration ratios, the increase in thermal efficiency at a concentration ratio of 113 was shown to be about 5% higher than the increase at a concentration ratio of 88. The optimal thermal performance was nearly at the same flow rate of about 22.5m3h−1 for all the nanofluids and concentration ratios. The optimal thermodynamic performance for low exergy destruction was mainly dependent on the inlet temperature used. Correlations for the Reynolds numbers that give improved thermodynamic performance were derived and presented.

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  • Mwesigye, Aggrey & Meyer, Josua P., 2017. "Optimal thermal and thermodynamic performance of a solar parabolic trough receiver with different nanofluids and at different concentration ratios," Applied Energy, Elsevier, vol. 193(C), pages 393-413.
    • Handle: RePEc:eee:appene:v:193:y:2017:i:c:p:393-413
    DOI: 10.1016/j.apenergy.2017.02.064
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    References listed on IDEAS

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