A diesel engine takes in air at 100kPa and 20°C and the maximum cycletemperature is 1100°C with a compression ratio of 12:1. Calculate the airstandard thermal efficiency based on the diesel cycle and the mean effectivepressure. Assume the compression and expansion to be adiabatic and themass of air in the cylinder after induction to be 0.6kg.Use the standard constants for air.

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Answered: A diesel engine takes in air at 100kPa…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Consider a Diesel cycle with cold-air-standard assumptions, and compression ratio of 21. The temperature and pressure at the beginning of the compression process are 320K and 120kPa respectively. The cutoff ratio for this cycle is 1.8. The isentropic efficiency of the compression and expansion process are 85%. Determine the temperature and pressure at the end of each process of the cycle, the heat transfer per unit mass in and out of the air; qin and qout, thermal efficiency of the cycle, and the mean effective pressure of the cycle.
! Required information Problem 09.034 - Ideal Otto Cycle with Variable Specific Heats - DEPENDENT MULTI-PART PROBLEM - ASSIGN ALL PARTS An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air is at 95 kPa and 27°C, and 760 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Take into account the variation of specific heats with temperature. The gas constant of air is R = 0.287 kJ/kg-K. Problem 09.034.a - State After Heat Addition in Variable Heat Capacity Ideal Otto Cycle Determine the pressure and temperature at the end of the heat-addition process. (You must provide an answer before moving on to the next part.) The pressure at the end of the heat-addition process is 3915.8 kPa. The temperature at the end of the heat-addition process is 1647.7 K.
Temperature after the heat addition process = K Thermal efficiency =% Mean effective pressure = kpa
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

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