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: rp, then:
Where, γ = index, rp = pressure ratio
A compressor is used in the refrigerator to increase the pressure of the gas.
IN the VCRS system, we generally prefer a reciprocating compressor.
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
ηv = volumetric efficiency
k = number of cylinders
Vc = clearance volume
C = clearance ratio
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