973 An Infiltration Estimate Example

Assume a 20' x 30' room with a 10' ceiling and one exposed perimeter wall with windows. What would the worst-case infiltration rate be?

The total air volume is 20 x 30 x 10 = 6,000 ft3. The table above recommends using 1.0 air changes per hour. However, assuming modern construction techniques, we follow ASHRAE's guideline of using 2/3 of the table values.

The heat loss due to infiltration for this space, if the indoor temperature was 70°F and the outdoor temperature was 25°F would be:

qinfiltration = 0.019 x 4,000 x (70 - 25) = 3,420 Btu/hr

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