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An ideal vapor compression refrigeration cycle using r134a as the refrigerant is being used to cool...

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Mechanical Engineering

An ideal vapor compression refrigeration cycle using r134a asthe refrigerant is being used to cool a house. It provides 3refrigeration tons ≈ 10.5kW of cooling (heat removal from the houseair). The refrigerant in the evaporator operates at 400kPa while inthe condenser it is at 1000kPa. Treat the surroundings as a thermalreservoir at 33◦C and the air in the house as a thermal reservoirat 19◦C. All reservoirs are at 100kPa.

1. What is the COPr of this cycle?

2. How fast is exergy destroyed (kJ/s) in each process(evaporator, condenser, throttle, compressor)?

3. Which process has the lowest second law efficiency?

4. What is the rate of exergy destruction (kJ/s) for thecycle?

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