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ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

EXPERIMENTAL AND THEORETICAL INVESTIGATION OF SELF-INSULATED GAS-TO-GAS HEAT EXCHANGER

Get access (open in a dialog) DOI: 10.1615/IHTC11.1750
pages 323-328

摘要

A new type of 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 consists of three porous media separated by two solid walls. A high temperature section is placed between low temperature and heat recovery sections. This arrangement enables the heat exchanger to be self-insulated. Three sets of coupled energy equations for gas and porous media are solved numerically for one-dimensional system, and to confirm the validity of the numerical analysis, experiments which correspond to the analytical model are conducted. The numerical results are shown to agree approximately with those of the experiments. It is also shown that, by adding the heat recovery section, the outer wall temperature of the heat exchanger can be maintained at such low values as about 40 ~ 50 °C, and the heat recovery rate of the system is almost doubled as compared with the system without it. Further, the overall heat-transfer coefficient defined by the heat flux evaluated from the whole energy transferred to the lower temperature gas and the maximum temperature difference in the system is shown to have the value of 20 ~ 60 W/m2K. for the inlet gas temperature of the high temperature section 400 ~ 1200 °C, which is 1.5 ~ 2 times higher than that of the conventional gas-to-gas heat exchanger.