The selection of the fan must be made as follows:
|a)||Estimate the calorific value in the unit.|
|b)||Determine the temperature rise value in the unit.|
|c)||Calculate the needed air quantity.|
H : Calorific value (kW)
|d)||Estimate the system impedance in the unit.|
△P = KQn(Pa)
△P : Reduced pressure (m3/min)
K : Constant measured in each unit.
Q : Air quantity
N : Determined by the air flow in the unit. n = 1 for steady flow, n = 2 for turbulent flow. n = 2 may be generally used.
|e)||Select the fan by the P-Q characteristics in the fan catalog.|
|f)||Mount it on the equipment to measure the temperature rise.|
Example: When setting the temperature rise value T = 10deg.C at calorific value 300W
= 1.5 (m3/min)
Estimate the system impedance, select the fan, conduct the actual operation, measure the temperature rise and investigate the fan.
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