Fan Power Final
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FAN POWER Source of formula: http://hvacformula.blogspot.com/2008/12/fan- equations.html BHP = Q x Total Friction Loss / (6356 x Fan Ef f.) Where: BHP = Break Horsepower Total Friction loss = in H 2 O Q = Air flow rate in CFM FAN EFF = Fan efficiency usually in 65–85% range = use 75%
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Fan power
Transcript of Fan Power Final
FAN POWER
Source of formula: http://hvacformula.blogspot.com/2008/12/fan-equations.html
BHP = Q x Total Friction Loss / (6356 x Fan Ef f.)
Where:
BHP = Break Horsepower
Total Friction loss = in H2O
Q = Air flow rate in CFM
FAN EFF = Fan efficiency usually in 65–85% range
= use 75%
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Example:
BHP = Q x Total Friction Loss / (6356 x Fan Ef f.)
For AHU 1
Q = 90000 CFM
Total Friction Loss = 3.3986 in H20
Fan Eff. = 75%
BHP = 90, 000 x 3.3986/ (6356x 0.75)
= 64.16536675
Use 65 hp
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AHUCFM
Total Friction Loss (in H20)
Brake Power (HP) FAN (HP)
AHU1 90000 3.3986 64.16536675 65
AHU 2 90000 3.3986 64.16536675 65
AHU 3 23100 2.8330 13.72803133 14
AHU 4 23100 2.8330 13.72803133 14
AHU 5 71500 4.1509 62.25865613 63
AHU 6 56400 4.0733 48.19304038 49
AHU 7 65550 3.9815 54.74849994 55
AHU 8 49910 4.1329 43.27074066 44
AHU 9 56250 3.9641 46.77560069 47
AHU 10 56250 3.9641 46.77560069 47
AHU 11 20600 1.9968 8.628788751 9
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