Authors:

Clark Lay

Date Created:

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About Paper:

In buildings such as hospitals and shopping malls air conditioning systems must use only outdoor air to ensure adequate ventilation. This is done using a dedicated outdoor air system (DOAS), which cools the outdoor air below its dew point temperature to meet specific comfort conditions. This process is energy intensive, with around 80% of the load on the cooling coil being latent load. Water vapor selective membranes provide an opportunity to greatly reduce power consumption by selectively removing water vapor from air using partial pressure gradient, thereby achieving dehumidification without phase change/condensation. In this work, we propose a Dual Membrane Module Dehumidifier (DMMD) that selectively removes water vapor prior to cooling and uses a second vapor selective membrane module to reject water vapor at sub-atmospheric pressures. Rejection at sub-atmospheric pressures reduces compressor pressure ratio and saves energy. Towards this, a thermodynamic modeling was conducted in MATLAB to investigate its annual energy saving potential over the conventional cooling and condensation process in the geographical location of Florida, USA. Performance parameters such as cooling coil size reduction, energy savings and moisture removal efficiency were compared. The analysis showed that the DMMD-DOAS was a greater improvement over a conventional DOAS as temperature and specific humidity rose. In the warmest and most humid months, evaporator capacity decreased by 54%, MRE improved by 16%, and energy savings were upwards of 13%. Keywords: [no keywords provided]

Source:

Purdue University / 2024

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Co-authors:

Clark Lay