Whenever a conditioned space is adjacent to a space with a different temperature (i.e. in a different zone), heat transfer through the separating physical section must be considered. The heat transfer rate is given by
(33)
where
= heat transfer rate, Btu/h
= coefficient of overall heat transfer between adjacent and conditional space, Btu/h·ft²·°F
= area of separating section concerned, ft²
= average air temperature in adjacent space, °F
= air temperature in conditioned space, °F