calculate cfm 1

[zedman]

hi, i'm designing a drying oven and need to choose the right fan for the oven. how to choose the fan?
dim. of the oven:2275x2378x5470(mm)
temp in oven: 80deg. celcius( same in the whole oven)

i want to use 2 fan for this oven. the air sucked from middle and distribute evenly to top and bottom of th oven. can somebody help me with this.?? thanks

 

[quark]

The minimum flow rate required (by this I am not accounting heat transfer efficiency) can be calculated by doing energy balance.

1.08 x cfm x (T1-T2) = [m x Cp x (t1-t2)]/X

Where, T1 = inlet temp. of air in deg.F
T2 = outlet temp. of air in deg.F
m = mass of the substance you are heating in the dryer in lb
Cp = specific heat in btu/lb F
t1 = initial temp. of the substance in deg.F
t2 = final temp. in deg.F
X = drying time in hrs.

Regards,