You modify your carnot engine to operate using reservoirs with temperatures of 0°c and 174°c. the engine extracts 30 j of energy per cycle from the hot reservoir. if the engine is being used as a lift, how many cycles will it take to lift a 12 kg mass a height of 10 m?

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.