A dense air refrigeration machine operating on Bell Coleman cycle operates between 3.4 bar and 17 bar. The temperature of air after the cooler is 150C and after the refrigerator is 60C. If the refrigeration capacity is 6 tons, calculate:
(i) temperature after compression and expansion
(ii) air circulation per min
(iii) work of compressor and expandor
(iv) theoretical COP
(v) rate of water circulation required in the cooler in kg/min if the rise in temperature is limited to 300C.