Experimental investigation on the heat and water transfer enhancement in a membrane-based air-to-air humidifier at insulation condition |
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| Affiliation: | 1. Department of Mechanical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, Iran;2. Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran;3. School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran;4. Department of Mechanical Engineering, University of Zabol, Zabol, Iran |
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| Abstract: | In the present study, a membrane-based air-to-air planar humidifier (MAPH) with baffle-blocked flow channels and a common MAPH are fabricated, tested and compared. These MAPHs are well thermal insulated from their surroundings. Polyoxymethylene (POM) plates with some unique properties such as large tensile and flexural strength, high chemical resistance and high stiffness are used to create channels at dry and humid sides of MAPHs. The obtained findings revealed that the higher heat and water transfer rates and smaller dew point approach temperature (DPAT) in entire tested flow rates occurs in baffle-blocked MAPH. To evaluate the MAPH performance with considering the pressure drop, a dimensionless parameter, performance evaluation criteria (PEC), is introduced. At flow rates less than 1 m3/h, PEC is less than 1, indicating a decline in MAPH performance with considering the pressure drop. In baffle-blocked MAPH using water trap in the inlet of dry side leads to the performance deterioration. Additionally, the increased relative humidity (RH) of humid side inlet causes an increase in DPAT, consequently, the performance deterioration. |
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| Keywords: | PEM fuel cell Membrane-based air-to-air planar humidifier Relative humidity Polyoxymethylene plates Water trap |
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