The cycle involved in the operation of an internal combustion engine is called the Otto cycle. Air can be considered to be the working substance and can be assumed to be a perfect gas. The cycle consists of the following steps: I) Reversible adiabatic compression from A to B. 2) Reversible constant-volume pressure increase from B to C due to the combustion of a small amount of fuel. 3) Reversible adiabatic expansion from C to D. 4) Reversible and constant-volume pressure decrease back to state A. Determine the change in entropy (of the system and of the surroundings) for each step of the cycle and determine an expression for the efficiency of the cycle, assuming that the heat is supplied in Step 2. Evaluate the efficiency for a compression ratio 10:1. Assume that in state A, V=4.00 dm', p= 1.00 atm, T= 300 K, that VA = 10 Vb, pc/pb = 5, and that Cp.m = (7/2)R Note that R = 8.314 J K-1 mol-1 and dm = 10-1 m.
The cycle involved in the operation of an internal combustion engine is called the Otto cycle. Air can be considered to be the working substance and can be assumed to be a perfect gas. The cycle consists of the following steps: I) Reversible adiabatic compression from A to B. 2) Reversible constant-volume pressure increase from B to C due to the combustion of a small amount of fuel. 3) Reversible adiabatic expansion from C to D. 4) Reversible and constant-volume pressure decrease back to state A. Determine the change in entropy (of the system and of the surroundings) for each step of the cycle and determine an expression for the efficiency of the cycle, assuming that the heat is supplied in Step 2. Evaluate the efficiency for a compression ratio 10:1. Assume that in state A, V=4.00 dm', p= 1.00 atm, T= 300 K, that VA = 10 Vb, pc/pb = 5, and that Cp.m = (7/2)R Note that R = 8.314 J K-1 mol-1 and dm = 10-1 m.
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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The cycle involved in the operation of an internal combustion engine is called the Otto cycle.
Air can be considered to be the working substance and can be assumed to be a perfect gas. The cycle consists of the following steps:
I) Reversible adiabatic compression from A to B.
2) Reversible constant-volume pressure increase from B to C due to the combustion of a small amount of fuel.
3) Reversible adiabatic expansion from C to D.
4) Reversible and constant-volume pressure decrease back to state A.
Determine the change in entropy (of the system and of the surroundings) for each step of the cycle and determine an expression for the efficiency of the cycle, assuming that the heat is supplied in Step 2. Evaluate the efficiency for a compression ratio 10:1. Assume that in state A, V=4.00 dm', p= 1.00 atm, T= 300 K, that VA = 10 Vb, pc/pb = 5, and that Cp.m = (7/2)R
Note that R = 8.314 J K-1 mol-1 and dm = 10-1 m.
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Step 1: Given data
VIEWStep 2: Draw T-S diagram of an otto cycle
VIEWStep 3: Derive the efficiency of otto cycle
VIEWStep 4: calculation of efficiency of cycle with compression ratio of 10:1
VIEWStep 5: change in entropy of system in each process of otto cycle
VIEWStep 6: change in entropy of system and surrounding both in each process of otto cycle
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