DOE EERE Research Reports

Thermally Activated Heat Pumps

Desiccant Dehumidification Systems

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Active Desiccant, Total Energy Recovery Hybrid System Optimizes Humidity Control, IAQ, and Energy Efficiency in an Existing Dormitory Facility
June 2002
John Fischer
Columbia, Missouri
  James R. Sand
Oak Ridge National Laboratory
Oak Ridge, Tennessee 37831
B. Elkin
Berry College
Rome, Georgia
  Kirk Mescher
CM Engineering
Columbia, Missouri

Abstract: This paper summarizes the investigation of an active desiccant, total energy recovery hybrid system pilot site installed during the fall of 1999. The hybrid system was assembled from a combination of commercially available air-handling modules, a standard total energy recovery module, and a customized active desiccant wheel cassette designed to integrate with these standard components. Significant performance advantages were recognized as a result of the combination of both "passive" and "active" desiccant technologies.

The dehumidification capacity of the hybrid system was shown to be very high, the cost of operation very low, and the overall system cost-effective. After two years of operation, the system has performed reliably and as anticipated. Most importantly, the system resolved numerous IAQ problems plaguing the dormitory facility by providing effective humidity control and increased, continuous ventilation air in accordance with ASHRAE Standard 62 recommendations.

The system was equipped with a direct digital control system, including full instrumentation, data trending, and remote monitoring capabilities. A detailed description of the system, installation details, samples of actual performance data, and documented energy savings are presented. The performance of the hybrid approach is compared with that of the original conventional cooling system serving an identical, opposite wing of the same facility.

Keywords: desiccant dehumidification, active desiccant, total energy recovery wheel, indoor air quality, IAQ

American Society of Heating, Refrigerating, and Air-Conditioning Engineers

This publication is protected by U.S. copyright laws and is not available for viewing or download.

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ASHRAE Transactions 2002
Vol. 108, Pt. 2
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