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ME Power Calculation 29.07.13

The document provides power calculations for a main engine including the area and length of the power card, mean indicated and effective power, engine RPM, total engine power in BHP and KW, fuel consumption rates, specific fuel oil consumption in g/BHP/hr and g/KW/hr, cylinder oil consumption rates, and specific cylinder oil consumption. It also includes a testbed report for another engine named Northern Light including load percentages, RPM, fuel index, maximum pressure, compression pressure, scaven air pressure, exhaust temperature, turbocharger speed, and specific fuel oil consumption.

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Catalin Sevastian
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476 views1 page

ME Power Calculation 29.07.13

The document provides power calculations for a main engine including the area and length of the power card, mean indicated and effective power, engine RPM, total engine power in BHP and KW, fuel consumption rates, specific fuel oil consumption in g/BHP/hr and g/KW/hr, cylinder oil consumption rates, and specific cylinder oil consumption. It also includes a testbed report for another engine named Northern Light including load percentages, RPM, fuel index, maximum pressure, compression pressure, scaven air pressure, exhaust temperature, turbocharger speed, and specific fuel oil consumption.

Uploaded by

Catalin Sevastian
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as XLS, PDF, TXT or read online on Scribd
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GIACINTA - POWER CALCULATIONS

Please fill up green cells only

POWER IN BHP

1 2 3 4 5 6 7
Area of power card- A 230 230 235 232 235 232 k2=1.77968xD2xS = 1.5377
Length of the power card - L 76 76 76 76 76 76 k2=1.30900xD2xS = 1.131
Mean indicated power pi=A/LxCs 12.10526 12.105263 12.36842 12.21053 12.36842 12.21053 Spring Constant Cs=0.25mm/bar 0.25
Mean effective power pe=pi-k1(k1=1) 11.10526 11.105263 11.36842 11.21053 11.36842 11.21053 Power at MCR (BHP) = 18420
Rpm n 83 83 83 83 83 83 Power at MCR (KW) = 13644
Indicated engine power Pi=k2xnxpi 1544.984 1544.9838 1578.57 1558.418 1578.57 1558.418 L.C.V. of used fuel (ISO)(Kcal/kg)= 10200
Effective engine power Pe=k2xnxpe 1417.355 1417.3547 1450.941 1430.789 1450.941 1430.789 L.C.V. of used fuel (ISO)(Kj/kg)= 40790

Total engine power (bhp) = 8598.171

Power output ratio (%) = 46.67845

POWER IN KW

1 2 3 4 5 6 7 Main engine data


Area of power card- A 230 230 235 232 235 232
Length of the power card - L 76 76 76 76 76 76 Time
Mean indicated power pi=A/LxCs 12.10526 12.105263 12.36842 12.21053 12.36842 12.21053
Mean effective power pe=pi-k1(k1=1) 11.10526 11.105263 11.36842 11.21053 11.36842 11.21053 Total fuel flow meter-
Rpm n 83 83 83 83 83 83
Indicated engine power Pi=k2xnxpi 1136.357 1136.3574 1161.061 1146.239 1161.061 1146.239
Effective engine power Pe=k2xnxpe 1042.484 1042.4844 1067.188 1052.366 1067.188 1052.366
M/E fuel consumption m3/hr - 1.36
Total engine power (kw) = 6324.076 M/E RPM - 83
Fuel oil temperature 48
Power output ratio (%) = 46.3506 Fuel oil specific gravity @150 C = 0.87
Corrected specific gravity = 0.84921
L.C.V of fuel (Kj/kg) = 40790
cylinder oil consumption/hr = 8.75

Specific Fuel oil consumption = 134.3222 gms/bhp/hr


(F.O.C (T/hr) x 106)/Output power(bhp) Remarks

Specific Fuel oil consumption (ISO) = 134.3222 gms/bhp/hr


(F.O.C(T/hr) x 106 x L.C.V(Kj/kg))/(Output power(bhp) x L.C.V of fuel @ ISO)

Specific Fuel oil consumption = 182.6236 gms/kw/hr


(F.O.C (T/hr) x 106)/Output power(kw)

Specific Fuel oil consumption (ISO) = 182.6236 gms/kw/hr


(F.O.C(T/hr) x 106 x L.C.V(Kj/kg))/(Output power(kw) x L.C.V of fuel @ ISO)

Specific cylinder oil consumption = 0.956599 gms/bhp/hr


(Cyl. Oil cons.(lt/hr) x density@150C x 103)/ Output power(bhp)

Specific cylinder oil consumption = 1.300585 gms/kw/hr


(Cyl. Oil cons.(lt/hr) x density@150C x 103)/ Output power(kw)

NORTHERN LIGHT - TESTBED REPORT

Load 50% 75% 90% 100%


RPM 83.3 95.4 101.4 105
Fuel Index 54 67 75 82
Pmax (bar) 104.7 132.7 142.5 149.2
Pcomp (bar) 72.7 105 120 130.2
Scav Air Pressure (bar) 1.1 2 2.5 2.8
Exhaust Temperature 271.7 273.3 294.2 313.3
T/C Speed 8670 10796 11728 12313
SFOC (g/BHP/h) 130.42 127.02 128.18 129.6

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