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Comparison Of Otto, Diesel and Dual Cycles

 




OTTO CYCLE : 

 * It consists of adiabatic and two constant volume processes.

 * Compression ratio is equal to expansion ratio.

 * Heat addition takes place at constant volume process.

 * Compression ratio is less. It varies from 5 to 6.

 * Efficiency depends on compression ratio only.

 * Efficiency is more than diesel cycle for same compression.

 * Heat rejected is less.


DIESEL CYCLE : 

 * It consists two adiabatic and two constant pressure processes.

 * Compression ratio is not equal to expansion ratio.

 * Heat addition takes place at constant pressure processes.

 * Compression ratio is more. It varies from 12 to 18. 

 * Efficiency depends on cut off ratio and compression ratio. 

 * Efficiency is less than Otto cycle for same compression ratio. 

 * Heat rejected is more. 


DUAL CYCLE :

* It consists of two adiabatic, two constant volume and one constant pressure processes.

* Compression ratio is not equal to expansion ratio. 

* Heat addition takes place at both constant volume and constant pressure processes.

* Compression ratio lies between two.

* Efficiency depends on compression ratio, cut off ratio and pressure ratio.

* Efficiency lies between two. 

* Heat rejected lies in between two. 


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