Required informationAn air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the compressionprocess, air is at 101.0 kPa and 27°C. Assume constant specific heats. The properties of air at room temperature areCp = 1.005 kJ/kg · K, c, = 0.718 kJ/kg . K, R= 0.287 kJ/kg-K, and k = 1.4.Determine the thermal efficiency.The thermal efficiency is

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Answered: Required information An air-standard…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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An Otto cycle with the air-standard assumptions (cv=0.717 kJ/kg.K and cp/cv=1.4) has a compression ratio of 10. Before the isentropic compression process, the air is at 140 kPa, 15°C, and 590 cm3. The heat transfer to the air per cycle is 1200 kJ/kg. The angular speed of the crankshaft for the four-stroke engine is 2400 revolutions per minute. Determine(a) the thermal (first law) efficiency,(b) the second law efficiency,(c) the net specific power output of the cycle (in kJ/kg)(d) the mean effective pressure (MEP),(e) the horse power (hp) of the engineNote: You must draw P-V and T-s charts and mark processes to have a score
(a) Derive an expression for the air standard efficiency of a Brayton cycle in terms of pressure ratio. (b) An engine working on Diesel cycle has a compression ratio of 15 and fuel supply is cut off at 8% of stroke. If the engine has a relative efficiency of 50%, determine the fuel consumption per kW-hr. Assume the fuel has a calorific value of 42000 kJ/kg.
Required information An air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the compression process, air is at 95 kPa and 27°C. Account for the variation of specific heats with temperature. The gas constant of air is R = 0.287 kJ/kg-K. Determine the thermal efficiency. (You must provide an answer before moving on to the next part.) The thermal efficiency is %
3. An air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the compression process, air is at 95 kPa and 27 °C. Accounting for the variation of specific heats with temperature, determine (a) the temperature after the heat addition process, (b) the thermal efficiency. and (c) the mean effective pressure. T, K h, kJ/kg Pr u, kJ/kg 300 300.19 1.3860 214.07 621.2 57.60 624.95 41.85 840 866.08 860 888.27 63.09 641.40 39.12 880 910.56 68.98 657.95 36.61 900 932.93 75.29 674.58 34.31 1700 1880.1 1025 1392.7 4.761 1750 1941.6 1161 1439.8 4.328 sº, kJ/(kg-K) 1.70203 2.77170 2.79783 2.82344 2.84856 3.5979 3.6336
An Otto cycle with the air-standard assumptions (cv=0.717 kJ/kg.K and cp/cv=1.4) has a compression ratio of 10. Before the isentropic compression process, the air is at 1xx kPa, 15°C, and 5yy cm³. The heat transfer to the air per cycle is 1zz0 kJ/kg. The angular speed of the crankshaft for the four-stroke engine is 2xx0 revolutions per minute. Determine (a) the thermal (first law) efficiency, (b) the second law efficiency, (c) the net specific power output of the cycle (in kJ/kg) (d) the mean effective pressure (MEP), (e) the horse power (hp) of the engine Note: You must draw P-V and T-s charts and mark processes to have a score Xx=04, yy=54,zz=84
The pressure and temperature at the beginning of compression of an air-standard Diesel cycle are 80 kPa and 300 K, respectively. At the end of the heat addition, the pressure is 6821 kPa and the temperature is 2150 K. (a) Determine the compression ratio. r = (b) Cutoff Ratio (c) Thermal Efficiency (d) Mean Effective Pressure
Required information An air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the compression process, air is at 101.0 kPa and 27°C. Assume constant specific heats. The properties of air at room temperature are Cp 1.005 kJ/kg K, c = 0.718 kJ/kg K, R= 0.287 kJ/kg-K, and k = 1.4. Determine the temperature after the heat-addition process. The temperature after the heat-addition process is K.
An air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the compression process, air is at 99 kPa and 27°C. Account for the variation of specific heats with temperature. The gas constant of air is R = 0.287 kJ/kg.K. Determine the mean effective pressure. The mean effective pressure is 569.685 kPa.
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