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A new self-insulated gas-to-gas heat exchanger is proposed on the basis of the effective energy conversion method between flowing gas enthalpy and thermal radiation. The present heat exchanger consist...s of three porous media separated by two solid walls. A high temperature (heating) section is put between low temperature (cooling) and heat recovery sections, and this arrangement enables the heat exchanger to be self-insulated. Atheoretical analysis is conducted for one-dimensional system. Three sets of coupled energy equations for gas and porous media are solved numerically under the conditions of the inlet gas temperature of the high temperature section T_<gho>=400～1600℃, the optical thickness τ_o=1.25～5.0, the mean working gas velocity u_m=0.15～0.6m/s and the emissivity of the separating wall ε=0.5～1.0. The temperature distributions of each section and the separating wall temperatures are demonstrated, and it is shown that the side wall temperature of the heat recovery section can be maintained at low temperatures (about 50℃ at the highest) for τ_o=2.5～5.0. Furthermore, the present heat exchanger is shown to exhibit high overall heat transmission coefficients.続きを見る
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Mendeley出力
KJ00004507819