4.5 Anhydrous ammonia (NH3) was one of the earliest practical refrigerants and is still used in industrial plants. For operation between -20C in the cooling coil and + 50 C in the outdoor coil, obtain the process conditions and compute the coefficient of performance of the cycle. Even though NHz is inexpensive and does not destroy the ozone layer, it is not currently used in household or automotive applications - can you suggest reasons for this?