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Dehumidification Without Re-heat Using Face and Bypass Dampers
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Installations with chill water cooling, needing constant air volume and dehumidification, traditionally use a draw through air handling unit with a cooling coil and a re-heat coil. Dehumidification is achieved by overcooling the discharge air to wring out moisture and then reheating it back to the desired temperature. This method works well but at the added expense of over cooling plus re-heating. A properly controlled Face and Bypass unit can deliver the same air conditions by blending return air and cold deck air with no need for re-heat. This system uses only the amount of cooling energy needed to do the job and no re-heat energy, in some cases as much as 50% less energy than the re-heat method.
Warila, D. T. (1994). Dehumidification Without Re-heat Using Face and Bypass Dampers. Energy Systems Laboratory (http://esl.tamu.edu); Texas A&M University (http://www.tamu.edu). Available electronically from