Stirling Cycle

Stirling cycle is a thermodynamic cycle consists of two isothermal and two isochoric processes. Heat rejection and heat addition takes place at constant temperature.

p-V and T-s diagram for the stirling cycle

Pressure-volume and Temperature-entropy diagram

1-2: Isothermal compression
2-3: Constant volume cooling
3-4: Isothermal exoansion
4-1: Contant volume heating
From the p-V and T-s diagram of stirling cycle it is clear that the amount of heat addition and heat rejection during constant volume is same.

Heat supplied = Work done during isothermal expansion
heat supplied stirling cycle

Heat rejected by the air during isothermal compression
Heat rejected during stirling cycle

Work done = heat supplied – heat rejected

Thermal efficiency can be given by the equation
Efficiency of stirling cycle

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