Temperature Rise

The temperature rise as the gas passes through a fan is

(T2T1)=T1[(P2P1)n1n1]

image (18-251)

Δ = (T2 T1), temperature rise, °F
where
Δt = temperature rise, °F
T1 = air or gas temperature at fan inlet, °R
p2 = fan outlet static pressure, in. water abs or other absolute units
p1 = atmospheric pressure or fan inlet pressure (if not atmospheric), in. water absolute or other absolute units
T2 = air or gas temperature at outlet, °R
Pv = fan outlet velocity pressure, in. water abs or other absolute units
n = polytropic coefficient
es = fan static efficiency, fraction

Fan Noise

In many installations, the noise of fan operation is important. This is particularly ...

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