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.

Question
Asked Oct 11, 2019

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.

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Expert Answer

Step 1

Given data:

Pressure at inlet P1 = 10 bar

Temeprature at inlet T1 =24°C

Pressure at outlet P2 = 3.0 bar

Step 2

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:

0=0-W+m[(-)+1/2(-V?)+ g(2 -2)
h-h0 or
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0=0-W+m[(-)+1/2(-V?)+ g(2 -2) h-h0 or

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Step 3

Using saturated pressure-ammoia table

and by using satu...

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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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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Mechanical Engineering

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