Calculating Supply Air CFM Using The Sensible Heat Equation | HVAC Psychrometrics

This one equation will change your life! Well, not really. But it is a fantastic tool if you are in the HVAC game.

By understanding how to use the sensible heat equation, HVAC professionals can design and troubleshoot HVAC systems that keep buildings comfortable and energy efficient.

The sensible heat equation is a formula used to calculate the amount of heat that can be transferred from one object to another. It is an essential tool for HVAC professionals, as it can be used to design and troubleshoot HVAC systems.

The formula for sensible heat is:

Q = CFM x ΔT x 1.1

Where:
Q is the amount of heat in BTU/hr
CFM is the volumetric flow rate of air in cubic feet per minute
ΔT is the change in temperature between the air entering and leaving the HVAC system or component or room
1.1 is a constant at sea level that accounts for the specific heat of air.

HVAC professionals can use the sensible heat equation to:

1. Calculate the heat that needs to be removed from a building to maintain a comfortable temperature.
2. Design HVAC systems capable of removing the required amount of heat.
3. Troubleshoot HVAC systems that are not performing as expected

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