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

Loading...
Thumbnail Image

Date

Authors

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

Journal Title

Journal ISSN

Volume Title

Publisher

Elsevier

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 showthat, 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 flowrates 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 flowrates and is between 0 and 0.24 at the highest flow rate.

Description

Keywords

Bejan number, Entropy generation, Fluid friction irreversibility, Heat transfer irreversibility, Parabolic trough, Receiver

Sustainable Development Goals

Citation

Mwesigye, A, Bello-Ochende, T & Meyer, JP 2013, 'Numerical investigation of entropy generation in a parabolic trough receiver at different concentration ratios', Energy, vol. 53, no. 5, pp. 114-127.