Fan Cooling Capacity
Fan Cooling Capacity
(OP)
Dear Folks;
I am a Mechanical Designer and I have been asked to replace the cooling fan on an industrial power supply with a model with a smaller footprint. Hopefully to reduce cost without sacrificing performance.
How do I calculate the cooling capacity of the proposed fan if I know its cfm and the its diameter ?
Any help would be much appreciated
Regards Adrian
I am a Mechanical Designer and I have been asked to replace the cooling fan on an industrial power supply with a model with a smaller footprint. Hopefully to reduce cost without sacrificing performance.
How do I calculate the cooling capacity of the proposed fan if I know its cfm and the its diameter ?
Any help would be much appreciated
Regards Adrian





RE: Fan Cooling Capacity
Q = 1.08 * cfm * DT
Q = heat transfer in BTU/hr
cfm = volume flow, cubic feet per minute
DT = temperature difference, in °F
1.08 = a conversion factor to give non-engineers a warm fuzzy feeling
If you want to incorporate sensible and latent heat, use
Q = 19 * cfm * Dh
Dh = the difference in enthalpy, in BTU/lbm
19 = again, a warm, fuzzy conversion factor
So in essence, it's not simply the flow and diameter, but what cooling is being performed at the unit. Flow certainly plays a part in this. Feel free to re-post if you have any added questions/concerns. -CB
RE: Fan Cooling Capacity