JP Journal of Heat and Mass Transfer
Volume 13, Issue 3, Pages 325 - 342
(August 2016) http://dx.doi.org/10.17654/MT013030325 |
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EXPERIMENTAL STUDY ON A MEMBRANE DEHUMIDIFIER FOR VENTILATION APPLICATION
Wei Ru Chang
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Abstract: A prototype of membrane humidifier for ventilation application is designed, fabricated, and tested in the present work. The dehumidifier using enthalpy recovery scheme has benefits of improvement of indoor air quality and reduction in thermal loads of HVAC systems in a building. It preconditions the hot, humid outdoor ventilation air by dumping heat and moisture to the dry exhausted air from indoor spaces. Parametric studies involve the dew point of outdoor fresh air and the ventilation flow rate across the dehumidifier. The performance matrices investigated include the water vapor transfer rate (WVTR), the dew point approach temperature (DPAT), the water dump ratio (WDR) and enthalpy efficiency. Results show that increasing the flow rate across the dehumidifier increases the DPAT and decreases the enthalpy efficiency of the dehumidifier. In addition, increasing the dew point of outdoor ventilation fresh air has negligible effects on the enthalpy efficiency of the dehumidifier due to its trade-off effects between the DPAT and the WDR. |
Keywords and phrases: membrane dehumidifier, ventilation, relative humidity, dew point approach temperature. |
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