1.8 A combined domestic unit serves, the dual purpose of cooling the kitchen larder and providing hot water. The motor driving the compressor operates for approximately one-third of the clay, and has an electrical input of 0.225 kW. The heat leakage into the larder from the kitchen is 0.29 kW. The mechanical efficiency of the compressor is 85% and the compression process can be taken to be adiabatic. All the heat rejected by the refrigerant is taken by the water in the domestic hot-water tank, which is heated from 10 to 60 SC. Calculate the amount of hot water which can be supplied by this plant in litres per hour. (6.08 1/h)