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Entropy 2011, 13(7), 1212-1228; doi:10.3390/e13071212

Application of the EGM Method to a LED-Based Spotlight: A Constrained Pseudo-Optimization Design Process Based on the Analysis of the Local Entropy Generation Maps

Department of Mechanical and Aerospace Engineering, University of Roma 1 “La Sapienza”, via Eudossiana 18, 00184 Roma, Italy
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Received: 22 April 2011 / Revised: 5 June 2011 / Accepted: 15 June 2011 / Published: 27 June 2011
(This article belongs to the Special Issue Entropy Generation Minimization)
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Abstract

In this paper, the entropy generation minimization (EGM) method is applied to an industrial heat transfer problem: the forced convective cooling of a LED-based spotlight. The design specification calls for eighteen diodes arranged on a circular copper plate of 35 mm diameter. Every diode dissipates 3 W and the maximum allowedtemperature of the plate is 80 °C. The cooling relies on the forced convection driven by a jet of air impinging on the plate. An initial complex geometry of plate fins is presented and analyzed with a commercial CFD code that computes the entropy generation rate. A pseudo-optimization process is carried out via a successive series of design modifications based on a careful analysis of the entropy generation maps. One of the advantages of the EGM method is that the rationale behind each step of the design process can be justified on a physical basis. It is found that the best performance is attained when the fins are periodically spaced in the radial direction.
Keywords: CFD; convection; entropy; EGM; compact heat-exchanger CFD; convection; entropy; EGM; compact heat-exchanger
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Giangaspero, G.; Sciubba, E. Application of the EGM Method to a LED-Based Spotlight: A Constrained Pseudo-Optimization Design Process Based on the Analysis of the Local Entropy Generation Maps. Entropy 2011, 13, 1212-1228.

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