Multi-objective design optimization of a micro heat sink for Concentrating Photovoltaic/Thermal (CPVT) systems using a genetic algorithm

被引:80
作者
Karathanassis, Ioannis K. [1 ,2 ]
Papanicolaou, Elias [1 ]
Belessiotis, Vassilios [1 ]
Bergeles, Georgios C. [2 ]
机构
[1] Natl Ctr Sci Res Demokritos, Solar & Other Energy Syst Lab, Inst Nucl Technol & Radiat Protect, Athens 15310, Greece
[2] Natl Tech Univ Athens, Sch Mech Engn, Lab Innovat Environm Technol, Athens 15780, Greece
关键词
CPVT; Microchannel heat sink; Conjugate heat transfer; Response surfaces; Genetic algorithm; Multi-objective optimization; COOLING TECHNOLOGIES; SHAPE OPTIMIZATION; SINGLE-PHASE; MICROCHANNELS; FLOW;
D O I
10.1016/j.applthermaleng.2012.06.034
中图分类号
O414.1 [热力学];
学科分类号
摘要
An optimization methodology for a microchannel, plate-fin heat sink suitable for the cooling of a linear parabolic trough Concentrating Photovoltaic/Thermal (CPVT) system is applied in this study. Two different microchannel configurations are considered, Fixed (FW mu) and stepwise Variable-Width (VW mu) microchannels respectively. The performance evaluation criteria comprise the thermal resistance of the heat sink and the cooling medium pressure drop through the heat sink. Initially, the effect of the geometric parameters on the heat sink thermal and hydrodynamic performance is investigated using a thermal resistance model and analytical correlations, in order to save computational time. The results of the 1-D model enable the construction of surrogate functions for the thermal resistance and the pressure drop of the heat sink, which are considered as the objective functions for the multi-objective optimization through a genetic algorithm that leads to the optimal geometric parameters. In a second step, a 3-D numerical model of fluid flow and conjugate heat transfer for the optimized FW mu heat sink is developed in order to investigate in detail the flow and thermal processes. The overall analysis demonstrates that microchannel heat sinks achieve very low values of thermal resistance and that the use of variable-width channels can significantly reduce the pressure drop of the cooling fluid. Furthermore, it is proven that the 1-D model is capable of providing a good estimate of the behavior of the heat sink. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:733 / 744
页数:12
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