Draw a neat labelled diagram of a Sterling cycle and describe the vari

1.	Draw a neat labelled diagram of a Sterling cycle and describe the various processes taking place in a Sterling engine.Sterling cycle P - V diagram
Answer» The working substance can be air or helium or hydrogen or nitrogen. All processes are reversible. 1. AB is isothermal expansion, at temperature T_H , in which heat Q_H is absorbed from the source and useful work is done by the working substance. 2. BC is isochoric process in which some heat is released by the gas (working substance) to the refrigerator and the gas cools to temperature T_C < T_H . 3. CD is isothermal compression, at temperature T_C , in which heat Q_C is rejected to the coolant (sink). 4. DA is isochoric process in which heat is taken in by the gas and its temperature rises to T_H [Note : Stirling engine operated in reverse direction is used in the field of cryogenics to obtain extremely low – temperatures to liquefy air or other gases.]

Draw a neat labelled diagram of a Sterling cycle and describe the various processes taking place in a Sterling engine.Sterling cycle P - V diagram

Answer»

The working substance can be air or helium or hydrogen or nitrogen. All processes are reversible.

1. AB is isothermal expansion, at temperature T_H , in which heat Q_H is absorbed from the source and useful work is done by the working substance.

2. BC is isochoric process in which some heat is released by the gas (working substance) to the refrigerator and the gas cools to temperature T_C < T_H .

3. CD is isothermal compression, at temperature T_C , in which heat Q_C is rejected to the coolant (sink).

4. DA is isochoric process in which heat is taken in by the gas and its temperature rises to T_H

[Note : Stirling engine operated in reverse direction is used in the field of cryogenics to obtain extremely low – temperatures to liquefy air or other gases.]

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