Abstract

Compact heat exchangers for heat removal has become one of the most effective cooling techniques. In this paper, numerical scheme to simulate conjugated heat transfer using additively manufactured heat exchanger is presented. A lattice structure as porous medium is used as effective cooling techniques for heat removal. The objective of these lattices is to transmit heat from the hot part to the cold part while letting the system benefit from two phenomena, heat conduction and convection. An optimization procedure using response surface method is proposed for the presented compact heat exchanger to improve the efficiency. This method was introduced in order to reach the global optimum with a limited number of computer experiments. Two optimization variables are identified: edge thickness for the lattices and the inlet velocity. A constraint optimization problem is formulated to maximize the heat flux through the heat exchanger. Hence at the same time, limiting the increase of the pressure drop and the decrease of the exit temperature.

摘要

用于散热的紧凑型热交换器已成为最有效的冷却技术之一。在本文中，提出了使用增材制造换热器模拟共轭传热的数值方案。作为多孔介质的晶格结构被用作用于散热的有效冷却技术。这些晶格的目的是将热量从热部分传递到冷部分，同时让系统受益于热传导和对流这两种现象。针对所提出的紧凑型换热器，提出了一种使用响应面法的优化程序，以提高效率。引入这种方法是为了通过有限数量的计算机实验达到全局最优。确定了两个优化变量：网格的边缘厚度和入口速度。制定约束优化问题以最大化通过热交换器的热通量。因此同时限制了压降的增加和出口温度的降低。