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Operating Refrigeration Unit with Outside Temperature at 118 F

Question

Consider the T-S diagram of a refrigerator unit. The working flid is R-22. The refrigerator operates between a low pressure of 0.60 bar absolute (measured in the evaporator) and high pressure of 18.0 bar absolute (measured in the condenser). Assume negligible pressure loss in either condenser (path 1 -> 2) or the evaporator (path 3-> 4). A throttle controls the pressure change between states 2 and 3. A perfectly insulated compressor provides the work for the cycle (Path 4->1). The quality of state 2 is 0.00 and the quality of state 4 is 1.00.



 

1) Could you operate this refrigeration cycle if the outside temperature is 118°F? Explain.

2) On a particularly cool day, R-22 emerges from the condenser (state 2) at 36 °C (the pressure remains at 18 bar). What is the enthalpy of this sub-cooled liquid? (Give answer in terms of kJ/kg).  


Summary    

The question belongs to Chemical Engineering and it is about refrigeration unit. The unit operates at low pressure of 0.60 bar and high pressure of 18 bar. The questions are about operating the refrigeration cycle if the outside temperature is 118°F and the enthalpy, if the condenser emerges from state 2.

Note: The solution is in handwritten format

 

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