Assuming a compression ignition engine having a cut-off ratio of 2 and a compression ratio of 20. Before the compression stroke, air is at 100kPa, 20°C and a volume of 500 cm³.Determine(in kPa) the mean effective pressure of the cycle

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Answered: Assuming a compression ignition engine…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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17. A diesel engine working on an air standard cycle has a peak temperature of 1200K. If the compression ratio of the engine is 20 and that the air at the entrance condition has a temperature of 300C. Determine the efficiency of the cycle. a. 68.6990% b. 68.6998% c. 68.6989% d. 68.6986%
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
1. A six-cylinder, four stroke, 3.2-L compression ignition engine operate on the diesel cycle with a compression ratio of 19. The air is at 95 kPa and 67°C at the beginning of the compression process and the engine speed is 1750 rpm. The engine uses light diesel fuel with heating value of 42,500 kJ/kg, an air-fuel ratio of 28 and a combustion efficiency of 98%. Using the constant specific heats at 850K determine the following: a) Maximum temperature b) Work net, Wnet c) Net Power output (kW) d) Specific fuel consumption in g/kWh, defined as the ratio of the mass of the fuel consumed to the net work output produced. *Constant specific heats at 850K: k=1.349, cp=1.110 kJ/kg-K, cv=0.823 kJ/kg-K, R=0.287 kJ/kg-K
7. A diesel engine working on an air standard cycle has a peak temperature of 1200K. If the compression ratio of the engine is 20 and that the air at the entrance condition has a temperature of 30C. Determine the efficiency of the cycle. a. 68.6990% b. 68.6998% c. 68.6989% d. 68.6986%
X=5
An engine operates with air on the cycle shown with isentropic processes 1- 2 and 3 - 4, and constant volume processes at 2 - 3 and 4 - 1. If the compression ratio (r) is 12, the minimum pressure is 200 kPa, and the maximum pressure is 10 MPa, determine the mean effective pressure. (Note:r = V1/V2 = V4/V3). TDC BDC v = const. МЕР: v = const.
A diesel engine working on the dual combustion cycle takes in air at 95kPa, 25°C and has a maximum cycle pressure of 6600kPa. The compression ratio is 15:1. Assuming that the heats supplied at constant volume and pressure are equal, calculate the thermal efficiency. Take the compression and expansion processes as adiabatic and c and Cp for air as 0.718kJ/kgK and 1.005kJ/kgK respectively.
An ideal Diesel engine uses air initially at 20°C and 90 kPa at the beginning of the compression process. If the compression ratio is 15 and the maximum temperature in the cycle is 2000ºC, determine the following: .net work (kJ) produced a. 812 b. 930 c. 1010 d. 1414 mean effective pressure (kPa) a. 812 b. 930 cut-off ratio a. 1.3 b. 2.8 c. 1010 d. 1414 c. 2.6 d. 5.7
A 4 stroke spark ignition engine operates on an ideal Otto cycle with a compression ratio of 8.5. This engine compresses the fresh air-fuel mixture from its initial volume to a final volume of 75cm. The air is at 101kPa and 20°C prior to the compression stroke. Temperature at the end of isentropic expansion is 750K. Make air standard assumption to solve this problem. Air properties: cp = 1.005KJ/kg.K; cy = 0.718KJ/kg.K; R = 0.287KJ/kg.K. Determine, • Mass of air in the engine (in kg). (answer to 4 decimals) (Hint: treat air as ideal gas at start of intake stroke - point 1 on P-V diagram) Isentropic Isentropic * Iout BDC TDC
Required information Problem 09.052 - Ideal Diesel Cycle with Variable Specific Heats - DEPENDENT MULTI-PART PROBLEM - ASSIGN ALL PARTS 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 103 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. Problem 09.052.b - Thermal Efficiency in Variable Heat Capacity Diesel Cycle Determine the thermal efficiency. (You must provide an answer before moving on to the next part.) The thermal efficiency is 59.38 %.
An air standard Otto cycle the maximum and minimum temperatures are 1400 and 15 ° C. The heat supplied per kilogram of air is 800 kJ. Calculate the compression ratio and the cycle efficiency. Calculate also the ratio of maximum to minimum pressure in the cycle.

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Assuming a compression ignition engine having a cut-off ratio of 2 and a compression ratio of 20. Before the compression stroke, air is at 100kPa, 20°C and a volume of 500 cm³. Determine (in kPa) the mean effective pressure of the cycle