Question

Compare the Otto cycle, Diesel cycle, and Stirling cycle.

a: Draw the P-v diagrams and label all the processes.

b: Draw the corresponding T-s diagrams for the three power cycles and label all the processes.

c: Draw the corresponding T-v diagrams for the three power cycles and label all the processes.

d: Discuss the similarity and the difference about their thermal efficiencies explicitly.

e: Discuss how to improve the thermal efficiencies of the Otto cycle, the Diesel cycle, and the Stirling cycle.

Answer 1

E) The efficiency of cycles is improved by

1) Otto cycle - efficiency can be improved by using monatomic gases like helium having specific heat ratio as 1.67
The other way to increase the efficiency is increasing cut off ration

2) Diesel Cycle - By reducing Cutt off ratio efficiency of the diesel cycle can be improved

3) Stirling cycle - By increasing the temperature difference between working temperatures efficiency can be improved

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