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Accession Number DE2012-1052892
Title Desiccant Enhanced Evaporative Air Conditioning: Parametric Analysis and Design. Conference Paper.
Publication Date Oct 2012
Media Count 10p
Personal Author E. Kozubal J. Woods
Abstract This paper presents a parametric analysis using a numerical model of a new concept in desiccant and evaporative air conditioning. The concept consists of two stages: a liquid desiccant dehumidifier and a dew-point evaporative cooler. Each stage consists of stacked air channel pairs separated by a plastic sheet. In the first stage, a liquid desiccant film removes moisture from the process (supply-side) air through a membrane. An evaporatively-cooled exhaust airstream on the other side of the plastic sheet cools the desiccant. The second-stage indirect evaporative cooler sensibly cools the dried process air. We analyze the tradeoff between device size and energy efficiency. This tradeoff depends strongly on process air channel thicknesses, the ratio of first-stage to second-stage area, and the second-stage exhaust air flow rate. A sensitivity analysis reiterates the importance of the process air boundary layers and suggests a need for increasing airside heat and mass transfer enhancements.
Keywords Air conditioning
Air flow
Cooling systems
Energy efficiency
Evaporative cooling
Exhaust systems
Heat transfer

Source Agency Technical Information Center Oak Ridge Tennessee
NTIS Subject Category 97J - Heating & Cooling Systems
89B - Architectural Design & Environmental Engineering
Corporate Author National Renewable Energy Lab., Golden, CO.
Document Type Technical report
Title Note Preprint
NTIS Issue Number 1307
Contract Number N/A

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