This is for calculating the CFM (cubic feet per minute) of air that the blower needs to move in order to compensate the total heat loss (ventilation,infiltration,heat loss through walls, windows, etc)
The formula is: CFM=Building volume in cubic feet/Minutes Air change
Where do I get the "minutes air change number" from?
I want to verify if my ducts are properly sized for the furnace that I am getting.
The heat loss for a structure (home) is calculated with:
H = Ht + Hv + Hi (1)
H = overall heat loss (W)
Ht = heat loss due to transmission through walls, windows, doors, floors and more (W)
Hv = heat loss caused by ventilation (W)
Hi = heat loss caused by infiltration (W)
My house heat loss was calculated by Heat2000 to be around 55kBTU/h
My furnace will be sized for 60K BTU/h
Now the blower must be able to recirculate the entire volume of air in the house in that hour. That means the heat will be uniformly distributed (according with the volume of each room) if the duct sizes are calculated correctly.
If the above are correct the CFM should be house volume/60
Is this correct?