I'm currently enrolled in an HVAC apprentice program and as a bonus assignment, the instructor gave us a formula and asked us to find its meaning and application.

Try as I might though, I couldn't find anything in my books or on the internet on this formula.

Does anyone here have even a general idea what this formula is and what it's used for?

Q =

q

--------------------

(Tr-To)(60P Cp)

Q = Ventilation Rate - CFM

q = Room Heat - Btu/hr

Tr = Allowed Room Temp - Farenheit

To = Outside Air Temp

P = Air Density - Lb M/Feet cubed

Cp = Specific Heat of Air = 0.24 Btu/lb M Farenheit