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The latent
cooling load has three main sources: outdoor air, occupants, and miscellaneous
sources, such as cooking, laundry, and bathing. The miscellaneous latent loads
are largely covered by outdoor air because most residences have exhaust fans and
clothes dryers that vent most of the moisture from these sources. This vent air
is accounted for in the infiltration calculation. McQuiston (1984) estimated latent
load factors for typical houses located in geographic regions ranging from very
dry to very wet using the transfer function method. A latent factor LF (LF = 1/SHF)
of 1.3 or a sensible heat factor SHF (SHF = sensible load/ total load) of 0.77
matches the performance of typical residential vapor compression cooling systems.
Homes in almost all other regions of North America have cooling loads with an
SHF greater than 0.77 and latent factors less than 1.3. |
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