B310 COMPACT CONDENSING HEAT EXCHANGER FOR EXHAUST GAS FROM FUEL CELL

概要

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The most part of energy losses in fuel cells is due to the heat released by the exhaust gas to atmosphere. The exhaust gas consists of air and steam with sensible and latent heat. As a lot of latent heat is included in the mixture gas, its recovery is very important to improve the power system efficiency using the fuel cell. The thermal hydraulic behavior was experimentally studied in a compact heat exchanger for the latent heat recovery from air-steam mixture gas. The compact heat exchanger consisted of staggered banks of 10 (9) rows and 40 stages of bare tubes of small diameter. The parametric study varying the air mass concentration was conducted. The temperature distributions of cooling water and mixture gas and the amount of condensate were measured. Based on the previous basic studies, a thermal hydraulic prediction method was also proposed. For the condensation of steam on heat transfer tubes, the modified Sherwood number taking account of the mass absorption effect on the wall was used. The experimental results agreed well with the prediction proposed in this study.
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