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Ventilation Air Preconditioning Systems
Abstract
Increased outside ventilation air
requirements demand special attention to
how that air will be conditioned. In winter,
the incoming air may need preheating; in
summer. the mixed air may be too humid for
effective dehumidification. Part-load
conditions pose greater challenges: systems
that cycle on and off allow unconditioned air
into the building during compressor off-cycles.
The Electric Power Research Institute has
teamed with manufacturers to develop dual
path HVAC systems, with one path
dedicated to preconditioning the outside air.
This paper discusses two such systems for
cooling and dehumidification applications:
one with a separate preconditioning unit and
one with separate ventilation and return air
paths in a single unit. Both deep-cool and
deep-dry the incoming air before mixing it
with the return air, thereby eliminating the
latent load on the primary cooling coil. As
unitary packages, they are easy to install in
new and retrofit applications. Also, their
excellent energy efficiency cuts electric
energy consumption, providing significant
operating savings.
Citation
Khattar, M.; Brandemuehl, M. J. (1996). Ventilation Air Preconditioning Systems. Energy Systems Laboratory (http://esl.tamu.edu); Texas A&M University (http://www.tamu.edu). Available electronically from https : / /hdl .handle .net /1969 .1 /6664.