Abstract
On the basis of an effective energy conversion phenomenon between gas enthalpy and thermal radiation, the thermal characteristics of a new type of multi-layered porous heat exchanger (PHE) are obtained in this study. This system has a five-layered structure consisting of two high temperature section, two heat recovery sections, and one low-temperature section. In each section, a transient theoretical analysis is conducted for a one-dimensional system in which convection, conduction, and radiation take place simultaneously in porous layers. The coupled energy equations for the gas flows and porous layers based on the two-flux radiation model are solved numerically to investigate the transient heat transfer characteristics of the system. It is clarified that this type of PHE operates efficiently, especially when the porous layers have high optical thickness.
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