HP Generating Set - Manual (Page 28)

25
Conversions of Centigrade and Fahrenheit
Water freezes at 0 ºC (32ºF) Water boils at 100 ºC (212ºF)
ºF= ( 1.8 x ºC ) + 32 ºC = 0.5555 ( ºF - 32 )
Fuel Consumption Formulas
Fuel Consumption(lb / hr) Specific FuelCons.( lb / BHP / hr) x BHP
=
Fuel Consumption(US gal / hr )
Spec. Fuel Cons. (lb / BHP / hr) x BHP
FuelSpecific Weight(lb / US gal )
=
FuelSpec.Weight( lb / US gal) FuelSpecific Gravity x 8.34 lb
=
Specific FuelConsumption(lb / BHP / hr )
FuelCons.( US gal / hr) x FuelSpec. Wt (lb / US gal)
BHP
=
Specific Fuel Consumption( kg / BHP / hr)
Spec.Fuel Cons.(lb / BHP / hr)
BHP
=
Electrical Motor Horsepower
Electrical Motor Horsepower =
kW Input x Motor Efficiency
0.746 x Generator Efficiency
Engine Horsepower Required =
kW Output Required
0.746 x Generator Efficiency
Piston Travel
Feet Per Minute ( FPM) = 2 x L x N
Where L = Length of Stroke in Feet
N = Rotational Speed of Crankshaft in RPM
BREAK MEAN EFFECTIVE PRESSURE (BMEP) (4 Cycle)
BMEP =
792 , 000 x BHP
Total Displacement x RPM