Abstract
Liquid desiccants can provide efficient dehumidification but have yet to see widespread adoption. Most systems studied previously use natural gas-combustion to heat and regenerate the desiccant, and a central chiller plant or cooling tower for removing the heat of absorption. Here we present modeling and experimental results on a novel packaged air conditioner integrating liquid-desiccant heat and mass exchangers with a vapor compression cycle. The packaged system does not need cold or hot water from a central plant or cooling tower and is suitable for rooftop unit air conditioners. The system uses the evaporator to cool the liquid desiccant that is absorbing moisture from the air, and the condenser to heat the liquid desiccant to regenerate it. Efficiency is improved by reducing the load on the evaporator for a given supply-air dewpoint. This paper presents the measured dehumidification efficiency for a 10- ton packaged air conditioner, focusing on dehumidifying ventilation air. The paper also presents a numerical model to predict the outlet conditions and dehumidification efficiency, which we compare with the measured data.
Original language | American English |
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Number of pages | 11 |
State | Published - 2022 |
Event | International Refrigeration and Air Conditioning Conference - West Lafayette, Indiana Duration: 10 Jul 2022 → 14 Jul 2022 |
Conference
Conference | International Refrigeration and Air Conditioning Conference |
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City | West Lafayette, Indiana |
Period | 10/07/22 → 14/07/22 |
NREL Publication Number
- NREL/CP-5500-77787
Keywords
- air conditioning
- dedicated outdoor air system
- dehumidification
- liquid desiccant
- membrane contactor