When calculating CFM for a space with a sensible load of 50,250 BTUs and supply air temperature of 58 degrees F, what is the CFM delivered?

To determine the correct cubic feet per minute (CFM) delivered, knowing the sensible load in BTUs and the supply air temperature is crucial. The formula used to calculate CFM based on the sensible heat load is as follows:

CFM = Sensible Load (BTUs) / (1.08 × (Supply Air Temperature - Return Air Temperature))

In this case, to solve for CFM, one would need to have the return air temperature. However, if we assume a typical return air temperature around 75°F, we can calculate it as follows:

1. Determine the temperature difference:

Supply Air Temperature (58°F) - Return Air Temperature (75°F) = -17°F.

2. Multiply by the conversion factor of 1.08:

CFM = 50,250 BTUs / (1.08 × -17°F)

This calculation results in a negative value, indicating that the scenario as presented should be reconsidered.

When we look closely at the sensible load and the typical supply and return air temperatures in HVAC calculations, we also need to ensure that the input values make sense practically.

The provided answer, 2,687 CFM, reflects a recalculation based on typical assumptions regarding the temperature