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QUESTION 3 A car engine produces 136 hp on the output shaft with a thermal efficiency...
A 3 litre, four-stroke, four-cylinder CI engine running at 3000 rpm produces 48 kW of brake...
A 3 litre, four-stroke, four-cylinder CI engine running at 3000 rpm produces 48 kW of brake power. Brake thermal efficiency is 30% and the calorific value of fuel is 42 MJ/kg. Assume density of air at ambient condition is 1.1.81 kg/m3, air-fuel ratio 21:1 and mechanical efficiency 0.8. Determine: (a) Rate of fuel flow into the engine (kg/s) (b) Rate of air flow into the engine (kg/s) (c) Mass rate of exhaust flow (kg/s) (d) Volumetric efficiency (e) Indicated thermal...
The answer is: 26.3% and 56.48 hp. Problem 12: An actual four-stroke SI engine has a...
The answer is: 26.3% and 56.48 hp.
Problem 12: An actual four-stroke SI engine has a total cylinder volume of 0.0015 m3 and a compression ratio of 9:1. The engine runs at 3000 rpm. At the start of the compression stroke the air is at 303 K and a pressure of 100 kPa. The ratio of the actual thermal efficiency of the engine to the air-standard cycle efficiency is 45%. The air to fuel ratio is 13:1. The internal energy...
this is the question and From ex.5. the energy by burning of the fuel Q'_H=333 KW Q'_L= 233KW(where thermal...
this is the question and
From ex.5.
the energy by burning of the fuel Q'_H=333 KW
Q'_L= 233KW(where thermal efficiency is 30%)
8.1 Exergy in a car engine int a Find the exergy delivered by burning of the fuel at 1800K in the car for Ex. 5.1. Also find the rate of exergy going out with the exhaust flow at 750 K assuming it is half the low temperature heat rejection and that of the other half is heat transfer...
A passenger car engine typically must produce 25 hp of shaft work during a level cruise at highway speeds. At this condition, estimate the power dissipated in the vehicle cooling system and the total...
A passenger car engine typically must produce 25 hp of shaft work during a level cruise at highway speeds. At this condition, estimate the power dissipated in the vehicle cooling system and the total fuel chemical energy flux into the engine: 8.33 hp/25 hp 25 hp/75 hp O 75 hp/25 hp 25 hp/25 hp
A passenger car engine typically must produce 25 hp of shaft work during a level cruise at highway speeds. At this condition, estimate the power dissipated...
A car engine whose output power is 145 hp operates at about 16 % efficiency. Assume...
A car engine whose output power is 145 hp operates at about 16 % efficiency. Assume the engine's water temperature of 79 ∘C is its cold-temperature (exhaust) reservoir and 495 ∘C is its thermal "intake" temperature (the temperature of the exploding gas-air mixture). What is the ratio of its efficiency relative to its maximum possible (Carnot) efficiency? Estimate how much power (in watts) goes into moving the car. How much heat, in joules and in kcal, is exhausted to the...
A gasoline engine has a power output of 170 kW (about 2.28×105 hp ). Its thermal...
A gasoline engine has a power output of 170 kW (about 2.28×105 hp ). Its thermal efficiency is 22.0 %. 1- How much heat must be supplied to the engine per second? Express your answer in joules per second. 2-How much heat is discarded by the engine per second? Express your answer in joules per second.
A single-cylinder four-stroke-cycle spark-ignition engine has a BSFC of 0.4 kg/kW-hr and a volumetric efficiency of...
A single-cylinder four-stroke-cycle spark-ignition engine has a BSFC of 0.4 kg/kW-hr and a volumetric efficiency of 78% at a speed of 45 rps. The bore is 6 cm and the stroke is 8.5 cm. What is the fuel flow rate, fuel-air ratio, and brake torque if the brake power output is 6 kW with ambient conditions of 100 kPa and 22 C?
A 4-stroke 3 litre V6 spark ignition petrol engine has a maximum power output of 100kW...
A 4-stroke 3 litre V6 spark ignition petrol engine has a maximum power output of 100kW at 5500rev/min, and a maximum torque of 236Nm at 3000rev/min. The minimum sfc is 0.090 kg/MJ at 3000 rpm, and the air flow rate is 0.068m²/s. The compression ratio is 8.9:1 and the mechanical efficiency is 90%. The engine was tested under ambient conditions of 20°C and 1 bar. Take the calorific value of fuel to be 44MJ/kg. (a) Determine the power output at...
A car engine whose output power is 205 hp h p operates at about 18 %...
A car engine whose output power is 205 hp h p operates at about 18 % % efficiency. Assume the engine's water temperature of 94 ∘C ∘ C is its cold-temperature (exhaust) reservoir and 495 ∘C ∘ C is its thermal "intake" temperature (the temperature of the exploding gas-air mixture). How much heat, in joules and in kcal, is exhausted to the air in 1.0 hh.
A car travels at a constant velocity of 90 km/h along an expressway under-ambient temperature and...
A car travels at a constant velocity of 90 km/h along an
expressway under-ambient temperature and pressure conditions. The
width of the car is 1.5 m while its height is 1.2 m. The wheelbase
(length between the front and rear wheels) is 2.5 m. The drag
coefficient is 0.22.
[Use
air, ambient density of the air = 1.12 kg/m3 and,
fuel, density of the fuel = 930 kg/m3. You may neglect
any energy contained in the exhaust gases and any...
The answer is: 26.3% and 56.48 hp.
Problem 12: An actual four-stroke SI engine has a total cylinder volume of 0.0015 m3 and a compression ratio of 9:1. The engine runs at 3000 rpm. At the start of the compression stroke the air is at 303 K and a pressure of 100 kPa. The ratio of the actual thermal efficiency of the engine to the air-standard cycle efficiency is 45%. The air to fuel ratio is 13:1. The internal energy...
this is the question and
From ex.5.
the energy by burning of the fuel Q'_H=333 KW
Q'_L= 233KW(where thermal efficiency is 30%)
8.1 Exergy in a car engine int a Find the exergy delivered by burning of the fuel at 1800K in the car for Ex. 5.1. Also find the rate of exergy going out with the exhaust flow at 750 K assuming it is half the low temperature heat rejection and that of the other half is heat transfer...
A passenger car engine typically must produce 25 hp of shaft work during a level cruise at highway speeds. At this condition, estimate the power dissipated in the vehicle cooling system and the total fuel chemical energy flux into the engine: 8.33 hp/25 hp 25 hp/75 hp O 75 hp/25 hp 25 hp/25 hp
A passenger car engine typically must produce 25 hp of shaft work during a level cruise at highway speeds. At this condition, estimate the power dissipated...
A single-cylinder four-stroke-cycle spark-ignition engine has a BSFC of 0.4 kg/kW-hr and a volumetric efficiency of 78% at a speed of 45 rps. The bore is 6 cm and the stroke is 8.5 cm. What is the fuel flow rate, fuel-air ratio, and brake torque if the brake power output is 6 kW with ambient conditions of 100 kPa and 22 C?
A 4-stroke 3 litre V6 spark ignition petrol engine has a maximum power output of 100kW at 5500rev/min, and a maximum torque of 236Nm at 3000rev/min. The minimum sfc is 0.090 kg/MJ at 3000 rpm, and the air flow rate is 0.068m²/s. The compression ratio is 8.9:1 and the mechanical efficiency is 90%. The engine was tested under ambient conditions of 20°C and 1 bar. Take the calorific value of fuel to be 44MJ/kg. (a) Determine the power output at...
A car travels at a constant velocity of 90 km/h along an
expressway under-ambient temperature and pressure conditions. The
width of the car is 1.5 m while its height is 1.2 m. The wheelbase
(length between the front and rear wheels) is 2.5 m. The drag
coefficient is 0.22.
[Use
air, ambient density of the air = 1.12 kg/m3 and,
fuel, density of the fuel = 930 kg/m3. You may neglect
any energy contained in the exhaust gases and any...
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