When dealing with changes in both sensible and latent heat such as in heating and humidification or in cooling, use the total heat formula for calculating the heat change in the air which states that:
Total Heat in Btu/hr = Specific Density x 60 min/hr x CFM x Delta H
Total Heat in Btu/hr = 0.075 x 60 x CFM x Delta H
Total Heat in Btu/hr = 4.5 x CFM x Delta H
Delta H = Change in the enthalpy of entering and leaving
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