A gasoline engine has a volumetric compression ratio of 10 and before compression has air at 290 K, 85 kPa in the cylinder. The combustion peak pressure is 6000 kPa. Assume cold air properties. What is the highest temperature in the cycle? Find the temperature at the beginning of the exhaust (heat rejection) and the overall cycle efficiency. Selution.
A gasoline engine has a volumetric compression ratio of 10 and before compression has air at 290 K, 85 kPa in the cylinder. The combustion peak pressure is 6000 kPa. Assume cold air properties. What is the highest temperature in the cycle? Find the temperature at the beginning of the exhaust (heat rejection) and the overall cycle efficiency. Selution.
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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Question
SOLVE OTTO CYCLE PROBLEM IN EXCEL
Transcribed Image Text:A gasoline engine has a volumetric compression ratio of 10 and before
compression has air at 290 K, 85 kPa in the cylinder. The combustion peak
pressure is 6000 kPa. Assume cold air properties. What is the highest temperature
in the cycle? Find the temperature at the beginning of the exhaust (heat rejection)
and the overall cycle efficiency.
Solution:
![Otto Cycle
Color Key
Ideal Gas Model used with specific heats as f(T)
Fill In
Instructions
Sensitivity Study
Problem
CR =
Otto
Sample Problem
Engine Sound?
STATE POINTS
P [kPa]
T°C]
T[K]
v [m'/kg] s [kJ/kg•K] u [kJ/kg]
1- Compression In
2 - Combustion Begins
3 - Expansion Begins
4- Expansion Ends
5 - Compression In
PROCESSES
Uin [kJ/kg]
Uout [kJ/kg] Q [kJ/kg]
W [kJ/kg]
Compression
0.0
0.0
Combustion
0.0
0.0
1
2
3
4
1
Power Stroke
0.0
0.0
1-2 isentropic compression
Heat Rejection
0.0
0.0
Sums =
2-3 constant volume heat addition (combustion)
3-4 isentropic expansion (power stroke)
Eta =
4-1 constant volume heat rejection](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F689552ee-eeaf-4d3b-8051-1b37edf834fd%2Fc75ca23a-03a8-487c-8fdd-e907daee77ce%2F9ujup3o_processed.png&w=3840&q=75)
Transcribed Image Text:Otto Cycle
Color Key
Ideal Gas Model used with specific heats as f(T)
Fill In
Instructions
Sensitivity Study
Problem
CR =
Otto
Sample Problem
Engine Sound?
STATE POINTS
P [kPa]
T°C]
T[K]
v [m'/kg] s [kJ/kg•K] u [kJ/kg]
1- Compression In
2 - Combustion Begins
3 - Expansion Begins
4- Expansion Ends
5 - Compression In
PROCESSES
Uin [kJ/kg]
Uout [kJ/kg] Q [kJ/kg]
W [kJ/kg]
Compression
0.0
0.0
Combustion
0.0
0.0
1
2
3
4
1
Power Stroke
0.0
0.0
1-2 isentropic compression
Heat Rejection
0.0
0.0
Sums =
2-3 constant volume heat addition (combustion)
3-4 isentropic expansion (power stroke)
Eta =
4-1 constant volume heat rejection
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