Refrigeration & Air conditioning : Gas Refrigeration

Gas Refrigeration System:

In air refrigeration, the Bell Coleman cycle is used which works on reversed Brayton cycle while Brayton cycle is used for gas turbine.

COP of reversed Brayton cycle:

Let pressure ratio: r_p, then:

Where, γ = index, r_p = pressure ratio

Compressor:

A compressor is used in the refrigerator to increase the pressure of the gas.

IN the VCRS system, we generally prefer a reciprocating compressor.

Clearance ratio:

Swept volume:

Volumetric efficiency is given by:

where D = diameter of the compressor

L = stroke length

n = N for 2 stroke

n = N/2 for 4 stroke

N = rotational speed

η_v = volumetric efficiency

k = number of cylinders

V_c = clearance volume

C = clearance ratio

This topic is important for GATE ME, ISRO ME, ESE IES ME, and other Mechanical exams.

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