Heat Transfer Distribution Inside Porous Media as Replacement for Finned Heat Exchanger

The article is aimed at replacing fins by porous media for finned heat exchanger as the evaporator of the loop thermosiphone for correct distribution of heat inside the electrotechnical box to achieve the best possible flow of heat transfer media. Heat exchangers are energy conservation equipment used to transfer heat between hot and cold fluid with or without evaporation or condensation phase change. Work is focused on CFD simulation of fluid flow and heat exchange on the air side of a one-row fin-and-tube heat exchanger and compared with porous media model. Model of finned evaporator was designed for simulating pressure drop over intercostal space, wit 2.5 mm distance between fins, at first for setting porous media coefficients. As velocity of air increase, the pressure drop increase as well. In the present work, the objective is to minimize the total weight (TW) or total annual cost (TAC) of the heat exchanger by minimalizing dimensions and maintain enough capability to be able to take 1 kW of waste heat produced by electronic components inside electrotechnical box. First version of evaporator heat exchanger was designed to fit into whole back space of box (EB), the second is to provide enough power but save space volume. This work focus on first model.