In this article generator room ventilation calculation will be briefly explained along with the example. Sit tight and follow the design calculations step by step. Let's start
First of all you have understand some important notes regarding generator room ventilation calculation. Those general notes are stated below:
- Clean , cool and dry air circulates around the switchgear, flows through the rear of the generator, across the engine, and discharges through the radiator
- Cool air should always be available for the engine air cleaner (air filter)
- For best ventilation results, air should flow first across the generator then to both sides of the engine
- Inlets located at the end of the room will provide adequate ventilation only to the engine nearest the inlet
- Air flow restriction should be 0.5 inch W.G
Ventilating air (cu.m/min.) = H / (D x SH x Dt) + Engine combustion air
Where:-
H = Heat Rejection to atmosphere in (KW) (for engine + generator)
H = 124.9KW (Refer To manufacturer data Sheet)
V = Ventilating air (cu.m/min)
D = Density of air = 1.09 kg/m3 @50 °C (Refer to air density table)
SH = Specific heat of air ( kw.min/Kg.°C)
SH = 0.017 kw.min/Kg.°C
Dt = (T2-T1) Temp. Rise inside generator room (°C)
T1 = Design temperature = 40 °C
T2 = Max allowable room temperature = 50 °C
Dt = (T2-T1) = 50-40 = 10 °C
ECA = Engine Combustion Air (Exhaust gas flow)
ECA = 130 cu.m/min (Refer To manufacturer data Sheet)
ECA = 7182 cu.m/hr
Air density at different temperatures listed below in table
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