Air enters the compressor of an air-standard brayton cycle with a volumetric flow rate of 60 m3/s at 0.8 bar, 280 k. the compressor pressure ratio is 20, and the maximum cycle temperature is 2100 k. for the compressor, the isentropic efficiency is 92% and for the turbine the isentropic efficiency is 95%. determine

(a) the net power developed, in mw
(b) the rate of heat addition in the combustor, in mw
(c) the thermal efficiency of the cycle

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.