A four-cylinder, four-stroke, spark-ignition engine operates on the ideal Otto cycle with a compression ratio of 11 and a totaldisplacement volume of 1.8 L. The air is at 90 kPa and 50°C at the beginning of the compression process. The heat input is1.1 kJ per cycle per cylinder. The gas constant of air is R = 0.287 kJ/kg-K and use constant specific heats with cv = 0.821kJ/kg-K, Cp 1.108 kJ/kg-K, and k=1.35.Determine the net work per cycle per cylinder and the thermal efficiency of the cycle.0.3408kJ.The net work per cycle per cylinder isThe thermal efficiency of the cycle is31 *

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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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Required information 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 790 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Take into account constant specific heats at room temperature. The properties of air at room temperature are cp= 1.005 kJ/kg-K, cv = 0.718 kJ/kg-K, R = 0.287 kJ/kg-K, and k = 1.4. Determine the mean effective pressure for the cycle. The mean effective pressure for the cycle is kPa.
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
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An otto cycle engine has a compression ratio of 8:1. At the beginning of the compression stroke the air is at 103.5 kPa and 300K. If the heat added is 920 kJ/kg. Calculate the maximum pressure in the cycle (kPa).
Required information 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 800 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Take into account constant specific heats at room temperature. The properties of air at room temperature are cp = 1.005 kJ/kg-K, cv=0.718 kJ/kg-K, R = 0.287 kJ/kg-K, and k = 1.4. Determine the net work output. The net work output is kJ/kg.
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.
Required information 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 730 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Take into account constant specific heats at room temperature. The properties of air at room temperature are cp=1.005 kJ/kg-K. cy=0.718 kJ/kg-K, R=0.287 kJ/kg-K, and k=1.4. Determine the net work output. (You must provide an answer before moving on to the next part.) The net work output is kJ/kg.
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 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 790 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Take into account constant specific heats at room temperature. The properties of air at room temperature are cp= 1.005 kJ/kg-K, cy= 0.718 kJ/kg-K, R = 0.287 kJ/kg-K, and k = 1.4. Determine the net work output. (You must provide an answer before moving on to the next part.) The net work output is kJ/kg.

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