In [1]:

```
#Estimate how much the temperature is lowered when the steam at 7 bar and
#260C is throttled to 1.4 bar. What is the approximate Joule-Thomson
#initialisation of variables
P= 7. #bar
P1= 1.4 #bar
T= 260. #C
T1= 251. #C
h= 2974.9 #J/gm
#CALCULATIONS
dT= T-T1 #Change in Temp.
Mj= dT/(P-P1) #Joule-Thomson coefficient
#RESULTS
print '%s %.2f' % ('Joule-Thomson coefficient (C/bar) = ',Mj)
raw_input('press enter key to exit')
```

Out[1]:

In [2]:

```
#A vapor compression refrigiration system, using Refrigirant 12, works between
#n evaporator temperature of 10F and a condenser temp. of 110F. The pumping
#rate for the refrigrant is 180 lbm/hr. Determine (a) the refrigirating
#effect, (b) the coefficient of performance,and (c) the capacity of refrigiration
#in tons
#initialisation of variables
T= 10. #F
T1= 110. #F
Pr= 180. #lbm/hr
h1= 78.335 #Btu/lbm
h3= 33.531 #Btu/lbm
h2= 91. #Btu/lbm
L= 12000. #Btu/hr per ton
#CALCULATIONS
h4= h3
QL= h1-h4 #Refrigerating effect
W= h2-h1 #Work done
COP= QL/W #Coffecient of performnance
C= QL*Pr/L #Capacity of refrigeration in tons
#RESULTS
print '%s %.2f' % ('Refrigerating effect (Btu/lbm) = ',QL)
print '%s %.2f' % (' \n Coffecient of performnance= ',COP)
print '%s %.2f' % (' \n Capacity of refrigeration in tons (ton) = ',C)
raw_input('press enter key to exit')
```

Out[2]: