100 kW power is used for refrigeration system working on bootstrap air refrigeration cycle. Required data are given below:

Ambient air pressure = 1 bar.

Ambient air temperature=288K

Compressor delivery pressure = 3.5 bar

Cabin pressure=1 bar.

Maximum pressure=5.6 bar

Heat exchanger effectiveness for both heat exchanger = 0.85

Efficiency of main and auxiliary compressors is 0.83 and 0.75 resp.

Turbine efficiency = 0.77

Cabin is maintained at 28˚C and 1 bar.


i. Refrigeration capacity in TR

ii. COP

iii. Determine the percentage of turbine power used by auxiliary compressor.

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