Misr J. Ag. Eng., July 2007
511
G- power requirements: The energy required
for cutting operation was
estimated by using the following formula (Arafa, 1991)
Required power = (Fc x 1/3600) ρ
F
x L.C.v. x 427η
Th
x η
m
x 1 ⁄ 75 x 1 ⁄
1.36, kW
Where:
Fc =
the fuel consumption rate, L/h
ρF = density of the fuel, kg/ L(for solar fuel= 0.85 kg/ L)
L.C.v. = lower calorific value of fuel. Kcal/ kg(average Lcv for
solar fuel is 10000 kcal/ kg
427 =thermo-mechanical equivalent, kg .m / kcal
η
Th
= thermal efficiency of engine (assumed as 40% for diesel
engine) and
η
m
= mechanical efficiency of the engine (considered to be
about 80% for diesel engine)
Estimation of the energy requirement for cutting operation: was carried
out using the following equation:
Energy requirements =
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