Fundamental Study on Multi-Layered Gas-to-Gas Heat Exchanger Using Porous Metal Plates as a Heat Transfer Medium

Abstract

To investigate the heat transfer characteristics of a multi-layered type of gas-to-gas heat exchanger, a series of experiments have been performed. The present heat exchanger is composed of two, three, four or five porous medium sections separated by opaque solid walls; that is, the low and high temperature sections in a two-layered type system and the low, first and second high temperature sections with the first and second heat recovery sections in a five-layer type system for instance. The effects of the inlet temperature of the high temperature gas, the optical thickness of the porous metal plates, and the heat exchanger structure (i.e. the number of layers) on the temperature distributions in the system and the heat recovery rate are clarified.