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Social ScienceAmmonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 24oC and exits at 3.0 bar. The refrigerant undergoes a throttling process. Determine the temperature, in oC, and the quality of the refrigerant at the exit of the expansion valve.
Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 24oC and exits at 3.0 bar. The refrigerant undergoes a throttling process.
Determine the temperature, in oC, and the quality of the refrigerant at the exit of the expansion valve.
Expert Answer
Given data:
Pressure at inlet P1 = 10 bar
Temeprature at inlet T1 =24°C
Pressure at outlet P2 = 3.0 bar
The steady-state energy balancve equation for a single inlet and oulet is
The heat transfer and kinetic and potential energy effects is neglected.
Also there is no work is associated with expansion valve, the energy balance equation is simplified as:
Image Transcriptionclose
0=0-W+m[(-)+1/2(-V?)+ g(2 -2) h-h0 or
Using saturated pressure-ammoia table
and by using satu...
Image Transcriptionclose
at P 10 bar Tr24.89°C sat T>T sat Thus,the state-lis sub-cooled at T = 24°C h h,293.45 KJ / Kg
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