FG Wilson Generating Set - Break Mean Effective Pressure; Conversions of Centigrade and Fahrenheit; Electrical Motor Horsepower; Fuel Consumption Formulas

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
Fuel
Cons
.
(
lb
/
BHP
/
hr
)
x
BHP
=
FuelConsumption(US gal / hr)
Spec. Fuel Cons. (lb / BHP / hr) x BHP
FuelSpecific Weight(lb /US gal)
=
Fuel
Spec
.
Weight
(
lb
/
US gal
)
Fuel
Specific
Gravity
x
8
.
34
lb
=
Specific FuelConsumption(lb / BHP / hr)
FuelCons.(US gal / hr) xFuelSpec.Wt(lb / US gal)
BHP
=
Specific FuelConsumption(kg / BHP / hr)
Spec.FuelCons.(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