Once the number of air changes per 24 hours has been determined from a given table, the total air change volume per 24 hours is found by multiplying the inside volume in cubic feet by the number of air changes.
To calculate the air change load in BTU per 24 hours, multiply the total air change volume by the standard air density to convert to pounds per hour and then by the difference in enthalpy between the outdoor and indoor air (ho – hi).
Air change load = (inside volume)(air changes)(0.075) (ho – hi)
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