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GENERATOR ROOM VENTILATION CALCULATION
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Diesel Generator capacity =
750KVA
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Ventilating air (cu.m/min.) = H +Engine Combustion Air
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Dx SHxDt
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Where :-
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 H =
Total Heat Radiation in (KW) (for engine + generator)
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 H =125.5KW
(Ref. To specs. Sheet)
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 V =
Ventilating air (cu.m/min.)
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 D =
Density of air (kg/m3)
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 =1.07
At 54 deg. C
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 SH =
Specific heat of air ( kw.min/Kg.C)
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 =0.017
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 d T =
Temp. Rise inside engine room ( deg.C)
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 =10deg.C
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 ECA =
Engine Combustion Air (Exhaust gas flow )
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 =120
cu.m/min
(Ref. To specs. Sheet)
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 7,182
cu.m/hr.
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Radiator fan air flow =
17.6cu.m/sec.
(Ref. To specs. Sheet)
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 =1056cu.m/min
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 = 37,256
cu.ft/min.
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THEN :-
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Ventilating air ( V ) =125.5 +120
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1.07x0.017x10
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 V =810
cu.m/min
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 V = 28,564
cu.ft/min.
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INTAKE LOUVER SIZE
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 -
Consider Air Velocity =
1000
ft/min.
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Total Air Quantity =
 28,564
cu.ft/min.
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Louver Area =
29
Sq.ft
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2.7
Sq.m
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Important Notes :-
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1-clean , cool , dry air circulates around the switchgear , flows through the rear of the generator , across the engine , and discharges through the radiator
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2-
Cool air shoul always be available for the engine air cleaner (air filter ).
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3-For best ventilation results , air should flow first across the generator then to both sides of the engine .
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4-Inlets located at the end of the room will provide adequate ventilation only to the engine nearast the inlet.
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5-
Air flow restriction should be 0.5 inch W.G
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