Abrayton-refrigeration cycle with a regenerative heat exchanger operates with a compressor and turbine at 86% efficiency. the compressor receives air at 480°r, 14.7 psi which is compressed to 40 psi. compressed air enters the regenerative heat exchanger at 540°r and cools down to 480°r before entering the turbine. if the refrigeration capacity is 15 tons, calculate: the volume flow rates entering the compressor and turbine. the coefficient of performance.

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.