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Xuan Linh Nguyen,Hoang Nghia Vu,Sangseok Yu(유상석) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The hollow fiber membrane has been using for shell and tube membrane humidifiers, which has a significant role in the proton exchange membrane fuel cell system. The humidity of the air entering the cathode has an intensive effect on the efficiency and durability of a fuel cell. Therefore, it is necessary to control the proper humidity of the cathode inlet air. The wet air flows with the opposite direction to the dry air separated by hollow fiber membranes so that the vapor transport is proceeded by concentration gradient. The water transport rate is determined to evaluate the performance of the hollow fiber membrane humidifier. The rate varies with operating conditions including temperature and pressure and varies with shell side flow regimes including diffusion and convection. Experiments for 21-fibers membrane module were conducted in two types of test jig humidifier with design of isothermal condition. Parameters of experiments are two shell diameters under various conditions, in which the temperature is from 40 to 80 ℃, the air pressure is from 0 to 1 bar<SUB>g</SUB>. The experimental results show that temperature has an exponential effect on vapor transport rate, but the rate is inversely proportional to air pressure. The convection regime of shell side flow contributes to the improvement of mass transfer.