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Question

An ideal gas air compressor cycle (with clearance) on pV diagram can be represented by processes.

A.

One adiabatic, two isobaric and one constant volume

B.

Two adiabatic and two isobaric

C.

Two adiabatic, one isobaric and one constant volume

D.

One adiabatic one isobaric and two constant volume

Answer ( Option B)

Two adiabatic and two isobaric

Solution

Adiabatic compression in simple terms means that no heat is given to or taken from the cylinder walls of the compressor. Also all work done in compressing the air is stored in the compressed air itself. Thus this process takes maximum energy input as no heat loss takes place through the cylinder walls.

VC = Clearance volume

Process 1– 2 : Adiabatic compression

Process 2– 3 : Discharge at constant pressure

Process 3– 4 : Adiabatic expansion

Process 4– 1 : Suction at constant pressure

Hence, the correct option is (B).

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