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Accession Number
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DE2012-1052892
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Title
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Desiccant Enhanced Evaporative Air Conditioning: Parametric Analysis and Design. Conference Paper.
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Publication Date
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Oct 2012
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Media Count
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10p
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Personal Author
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E. Kozubal J. Woods
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Abstract
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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.
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Keywords
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Air conditioning
Air flow
Cooling systems
Dehumidification
Desiccants
Design
Energy efficiency
Evaporative cooling
Exhaust systems
Heat transfer
Meetings
Membranes
Moisture
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Source Agency
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Technical Information Center Oak Ridge Tennessee
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NTIS Subject Category
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97J - Heating & Cooling Systems
89B - Architectural Design & Environmental Engineering
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Corporate Author
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National Renewable Energy Lab., Golden, CO.
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Document Type
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Technical report
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Title Note
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Preprint
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NTIS Issue Number
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1307
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Contract Number
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N/A
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