Latent and sensible cooling and heating equations - in imperial units
Sensible heat is heat exchanged by a body thermodynamic system that has as its sole
effect a change of temperature
Latent Heat, which is the amount of heat exchanged that is hidden, meaning it occurs
without change of temperature
Sensible Heat:
The sensible heat in a heating or cooling process of air (heating or cooling capacity) can be expressed as
hs =1.08 q dt (1)
where
hs =sensible heat (Btu/hr)
q =air volume flow (cfm, cubic feet per minute)
dt =temperature difference (F)
Latent Heat:
The latent heat due to moisture in the air can be expressed as:
ht =0.68 q dWgr (2)
or
ht =4, 840 q dWtb (3)
where
h1= latent heat (Btu/hr)
q = air volume flow (cfm, cubic feet per minute)
dwgr =humidity ratio difference (grains water / lb dry air)
dw1b =humidity ratio difference (lb water / lb dry air)
• 1 grain= 0.0001431b =0.0648 g
