Answer to Question #83950 in Mechanical Engineering for Mohammed Galadima

Question #83950
A vapour compression plant uses R134a and has a suction saturation temperature of -5°C and a condenser saturation temperature of 45°C. The vapour is dry saturation on entering the compressor and there is no undercooling of condensate. The compression is carried out isentropically in two stages and a flash chamber is employed at an interstage saturation temperature of 15°C. Calculate:
i. the amount of vapour bled off at the flash chamber;
ii. the state of the vapour at the inlet to the second stage of compression;
iii. the refrigerating effect per unit mass of refrigerant in the condenser;
iv. the work done per unit mass of refrigerant in the condenser;
v. the coefficient of performance
Expert's answer
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