Thermodynamics and Heat Transfer 5. A Carnot heat engine absorbs heat at a rate of 10 kJ/s from a source at 500C and rejects the waste heat to the environment at 25C. It is proposed that the heat engine will be used to drive a Carnot refrigerator that removes heat from the cooled space at -10C and rejects it to the same environment at 25C. i) Determine the minimum rate of heat removal from the cooled space. ii) What is the minimum rate of heat rejected by the refrigerator if the heat engine now receives heat at a rate of 10 kJ/s from a source maintained at 400C. (4+4)