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Separating and Throttling Calorimeter
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Experimental Calculation

 

Temperature after throttling :    T1

Gauge pressure of Steam Generator : P1

Gauge Pressure before Throttling : P

Manometer difference : H

Volume of moisture collected : W

Volume of dry steam copllected after throttling: Wd

 

Observations:

 

T (0C)

P (Kpa)

T1(0C)

P1(KPa)

H(mm of Hg)

W

Wd

120.5

117.0154

104.33

151.78

10

36.91

51.44

123

130.75

105.87

159.20

17.88

40.53

64.19

115.5

120.94

105

136.94

20

29.45

54.9306

 

Now let me perform calculation for 2nd reading.

 

1) Dryness fraction of separating calorimeter:

X1 Wd/(W+Wd) = 0.61

 

2) Pressure of superheated steam:

P2 = 101.325 + 13.6*9.81*18/1000 = 103.73 KPa

 

3) Specific heat of steam:

CP = 2081.6645 J/Kg

 

4) Sensible heat of water at pressure P (From steam table):

HW1 = 449961 Joule

 

5) Latent heat of wet steam entering throttling calorimeter (Steam Table):

L1 = 2237790 J/Kg

 

6) Total heat of dry steam at pressure P2 (Steam table):

H2 = 2655180 Joule

 

7) Saturation temperature at P2 (Steam table):

T2 = 99.94 0C

 

8) Dryness fraction from throttling calorimeter:

X2 (H2+Cp(t1-t2)-Hw1)/L1= 0.976

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