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Dehumidification Without Re-heat Using Face and Bypass Dampers
Abstract
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.
Citation
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 https : / /hdl .handle .net /1969 .1 /6646.