Q6/ A window air conditioner uses R22, the evaporator pressure is 0.5 MPa and the condenser pressure is 2.15 MPa. The cooling capacity is 2 TR. The temperature of the refrigerant exits the compressor is 85°C. The refrigerant is saturated vapor at the inlet of the compressor and no subcooling. Determine the mass flowrate of the cycle.

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13. A plant using R-134a is used to chill water for warship systems. The condenser is also cooled by water. Assume no undercooling in the condenser. The following data is to be used: 50L/s Water flowrate through evaporator Water inlet temperature to evaporator Water outlet temperature from evaporator -10°C 20°C 140L/s 350kPa 1100kPa Water flowrate through condenser Compressor suction pressure Compressor discharge pressure Compressor suction temperature Compressor discharge temperature Specific heat capacity of water Calculate: -10°℃ 60°C 4.2kJ/kgK a. Coefficient of Performance b. refrigerant cooling load c. refrigerant mass flowrate d. compressor power e. heat removed in condenser f. temperature change in condenser cooling water

The evaporator (a heat exchanger) in an A/C unit has R-410A entering at -20 °C and a quality of 30% and leaves at the same temperature and a quality of 100%. The COP of the air conditioner is known to be 1.3 and the mass flow rate is given as 0.013 kg/s. Find the power input to the cycle. (Note that, here, the evaporator is the part of the A/C unit that accepts [i.e., withdraws] heat from the room maintained at a cold temperature)