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ATM/BAE-455/450 Agricultural Machinery Systems (Due March 21 in class) Homework Set 3: IC Engines 1. A 9-liter 4-stroke engine produces 200 kW at 2100 rpm. At that condition, calculate torque, in N-m. 2. A 9-liter 4-stroke engine produces 200 kW at 2100 rpm. At that condition, calculate BMEP, in bars. 3. An engine has a brake specific fuel consumption of 220 g/kWh at 2100 rpm and 150 kW. Assume the fuel has a lower heating value of 42 MJ/kg and a density of 0.85 g/cmÂ³. Calculate fuel flow in L/hour. 4. An engine has a brake specific fuel consumption of 220 g/kWh at 2100 rpm and 150 kW. Assume the fuel has a lower heating value of 42 MJ/kg and a density of 0.85 g/cmÂ³. Calculate brake thermal efficiency, in %. 5. Based on the performance map shown below, what is the approximate engine rpm when the engine produces 20 kW at its most efficient point? 6. Based on the performance map shown below, what is the approximate engine rpm when the engine produces 20 kW at its least efficient point? TOF 96.7 kPa 290 30 325 359 20 72 400 15 10 100 1050 1200 1330 1500 1650 1800 SPEED REV/MIN 1900 2100 2-0

          ATM/BAE-455/450 Agricultural Machinery Systems (Due March 21 in class) Homework Set 3: IC Engines

1. A 9-liter 4-stroke engine produces 200 kW at 2100 rpm. At that condition, calculate torque, in N-m.
2. A 9-liter 4-stroke engine produces 200 kW at 2100 rpm. At that condition, calculate BMEP, in bars.
3. An engine has a brake specific fuel consumption of 220 g/kWh at 2100 rpm and 150 kW. Assume the fuel has a lower heating value of 42 MJ/kg and a density of 0.85 g/cmÂ³. Calculate fuel flow in L/hour.
4. An engine has a brake specific fuel consumption of 220 g/kWh at 2100 rpm and 150 kW. Assume the fuel has a lower heating value of 42 MJ/kg and a density of 0.85 g/cmÂ³. Calculate brake thermal efficiency, in %.
5. Based on the performance map shown below, what is the approximate engine rpm when the engine produces 20 kW at its most efficient point?
6. Based on the performance map shown below, what is the approximate engine rpm when the engine produces 20 kW at its least efficient point?

TOF
96.7 kPa
290
30
325 359
20
72
400
15
10
100
1050 1200 1330
1500 1650 1800 SPEED REV/MIN
1900
2100 2-0

atmbae 455450 agricultural machinery systems due march 21 in class homework set 3ic engines 1a 9 liter4 stroke engine produces 200 kw at 2100 rpmat that condition calculate torque in n m 2a 81444

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