(i) Ammonia enters a condenser at 102C and leaves at 2C, 08 dry, at the same pressure. Find the energy output from the condenser. (ii) Ammonia at 10C and 04 dry is throttled and the temperature drops to -10C. Find the dryness fraction after the throttling process. (iii) Calculate the amount of energy required to convert liquid ammonia at -20C to a wet vapour at -4C with a dryness fraction of 07.