Determine the brake power (KW) and the brake thermal efficiency (%).
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Round off 4 decimal, Powerplant subject
A dynamometer test was done for one hour at steady load on a 6 cylinder diesel engine. It was found to use 42 kg of fuel having Q h = 42,000 J/g. Cylinder is 22.8 cm x 27 cm, 4 cycle type. Speed, 550 rpm and dynamometer torque at 27000 kg cm. Determine the brake power (KW) and the brake thermal efficiency (%).
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- A 4-cylinder, 4-stroke engine gave the following results when tested on a test bed and the following readings were obtained. • Shaft speed = 4500 rev/min • Fuel consumption = 2.5 g/s • Fuel Calorific Value = 44 MJ/kg • Indicative mean effective pressure = 650 kPa • Piston stroke = 120 mm • Piston bore = 100 mm, • Net Brake Load = 350 N • Torque arm = 0.40 m (Shaft Torque = Net Brake Load × Torque arm) Determine the: (a) Engine indicated power, (b) Brake power, (c) Brake thermal efficiency, (d) Friction power, and (e) Mechanical efficiency.An IC engine built to generate power on the basis of constant volume combustion cycle is tested for its performance and the following data were noted. Time taken for 30 cc consumption of fuel by engine=50 seconds, Number of cylinders=1, Mean effective pressure=13 bar, Brake load on dynamometer=6kg, Brake drum radius=22 cm, Engine speed =2308 rpm, Stroke volume = 800 cc, Calorific value of fuel=44000kJ/kg, Specific gravity of fuel=0.7, Density of3standard fluid=1000kg/m , IP=40kW.a) Find if the engine used is a 2-stroke engine or 4-stroke engine?b) What is the percentage conversion of combustion heat to useful output power?c) What percent of the power generated inside the cylinder is transmitted as useful power output?d) If the swept volume is increased by 10%, what would be the change in power generatedinside the cylinder if the engine speed and mean effective pressure is assumed to remain the same as before?A 739 KW diesel-engine power plant has the following data: fuel rate, 245 liters per hour at 22 C with a specific gravity of 0.922; coolant flow rate, 1135 liters/min, with inlet and outlet temperature of 25 C and 35 C, respectively; air temperature of 18 C at a volume flow rate of 5071 m°/hr; exhaust gas temperature of 400 C. If the engine is an 8-cylinder, 375 mm x 457 mm x 267 rpm and the generator efficiency is 93 %, conduct an engine heat balance based on the above data
- In a laboratory test of a 4-stroke engine with Vd = 3.05 liters at N = 3000 RPM the following performance data are measured: net IMEP 107.9 lbf/in2 , 70.32 brake horsepower, fuel flow rate 16.66 kg/hr., air flow rate 269.6 kg/hr. The fuel is C8H18 (QR = 4.3 x 107 J/kg.) The ambient air temperature is 295K. The intake pressure gauge is broken, so the intake pressure is not known. Determine: (d) brake thermal efficiency, (e) indicated torque, (f) Is this engine throttled, turbocharged or neither? Explain. (Hint: compute the volumetric efficiency.)In a laboratory test of a 4-stroke engine with Vd = 3.05 liters at N = 3000 RPM the following performance data are measured: net IMEP 107.9 lbf/in2 , 70.32 brake horsepower, fuel flow rate 16.66 kg/hr., air flow rate 269.6 kg/hr. The fuel is C8H18 (QR = 4.3 x 107 J/kg.) The ambient air temperature is 295K. The intake pressure gauge is broken, so the intake pressure is not known. Determine: (a) Brake MEP, (b) Friction MEP, (c) equivalence ratio, (d) brake thermal efficiency, (e) indicated torque, (f) Is this engine throttled, turbocharged or neither? Explain. (Hint: compute the volumetric efficiency.)An engine is working on Otto cycle with the following specifications: Pressure and temperature of the intake air = 1 bar and 27oC Compression ratio = 6.2 Maximum pressure allowable in the cycle = 48 bar Index of compression and expansion = 1.25 Cylinder diameter =12 cm Stroke length = 20 cm Number of cycles per minute = 250 1) Discuss any three methods to improve performance of the cycle with justification based on the data given in the question.
- Q#01 An eight-cylinder, four-stroke engine of 9 cm bore and 8 cm stroke with a compressionratio of 7 is tested at 4500 rev/min on a dynamometer which has 54 cm arm. During a 10minutes test the dynamometer scale beam reading was 42 kg and the engine consumed4.4 kg of gasoline having a calorific value of 44000 kJ/kg. Air at 27C and 1 bar wassupplied to the carburettor at the rate of 6 kg/min. Take R for air = 287 kJ/(kg·K). Find:(1) the brake power delivered (bp),(2) the brake mean effective pressure (bmep),(3) the brake specific fuel consumption (bsfc),(4) the brake specific air consumption (bsac),(5) the brake thermal efficiency (b, th),(6) the volumetric efficiency (vol), and(7) the air-fuel ratio (A/F) on mass basis.Draw the simplified schematic diagram of the plant showing all the necessary data displayed on itThe following data refers for the single cylinder 4 stroke diesel engine. The brake power is 73 kW and engine speed is 500 rpm. The break mean effective pressure is 8 bar and mechanical efficiency is 80 %. The BSFC of the engine is .30 kg/kWhr of the fuel calorific value of 43200 kJ/kg. Determine indicated thermal efficiency.A four-stroke SI engine 0.08 m bore (d), 0.10 m stroke (L), is tested at full throttle at constant speed. The fuel supply is fixed at 0.0011333 kg/s and the spark plugs of the four cylinders are successively short circuited without change of speed, brake torque being correspondingly adjusted. The brake power (bp) measurements are the following:With all cylinders firing = 12.5 kWWith cylinder No. 1 cut off = 9 kWWith cylinder No. 2 cut off = 9.15 kWWith cylinder No. 3 cut off = 9.2 kWWith cylinder No. 2 cut off = 9.1 kWThe lower calorific (or heating value, LCVf) of the fuel is 44100 kJ/kg. The clearancevolume (Vcl) of one cylinder 70.0 x 103 mm3. Determine:(a) Indicated power (ip) of the engine under these conditions.(b) The indicated thermal efficiency (c) The relative efficiency of this engine. (d) Draw schametic diagram
- A four-stroke SI engine 0.08 m bore (d), 0.10 m stroke (L), is tested at full throttle at constant speed. The fuel supply is fixed at 0.0011333 kg/s and the spark plugs of the four cylinders are successively short circuited without change of speed, brake torque being correspondingly adjusted. The brake power (bp) measurements are the following:With all cylinders firing = 12.5 kWWith cylinder No. 1 cut off = 9 kWWith cylinder No. 2 cut off = 9.15 kWWith cylinder No. 3 cut off = 9.2 kWWith cylinder No. 2 cut off = 9.1 kWThe lower calorific (or heating value, LCVf) of the fuel is 44100 kJ/kg. The clearancevolume (Vcl) of one cylinder 70.0 x 103 mm3. Determine:(a) Indicated power (ip) of the engine under these conditions.(b) The indicated thermal efficiency (c) The relative efficiency of this engine.Energy balance results (in kW) obtained for the same medium speed single cylinder diesel engine are reported in the following table. The brake thermal efficiency of the cycle (%) for case 2 is: Case N (rpm) bmep (bar) O chaat Quarer shaft ambient 500 9.90 7.1 2.2 4.2 19.1 60.3 2 500 3.52 24.5 6.1 3.6 5.2 3 400 3.50 23.8 4.9 4.1 1.4 Select one: O a. 42.7 O b. 58.73 O c. 52.17 O d. 14.7 O e. 22.14A 4-cylinder, 2-stroke-cycle internal-combustion engine has 160 rpm and a mean effective pressure of 7.5 bar. Consider the piston diameter and piston stroke is 4” and 5”, determine (a) piston displacement, (b) total piston displacement, (c) clearance volume if the compression ratio is 8:1, (d) cylinder volume, (e) indicated horsepower and (f) brake horsepower at 75% mechanical efficiency.