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| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /1919/CH5/EX5.18 | |
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initial commit / add all books
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| -rwxr-xr-x | 1919/CH5/EX5.18/Ex5_18.sce | 39 |
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diff --git a/1919/CH5/EX5.18/Ex5_18.sce b/1919/CH5/EX5.18/Ex5_18.sce new file mode 100755 index 000000000..d3433d0b6 --- /dev/null +++ b/1919/CH5/EX5.18/Ex5_18.sce @@ -0,0 +1,39 @@ +
+// Theory and Problems of Thermodynamics
+// Chapter 5
+//Second Law of Thermodynamcis
+// Example 18
+
+clear ;clc;
+
+//Given data
+ms = 5 // mass of steel block in kg
+mw = 5 // mass of water in kg
+T1 = 1273.15 // initial temperature of steel block in K
+T2 = 373.15 // final temperature of steel block in K
+Cp = 0.5 // specific heat of steel in kJ/kg K
+hf1 = 419.04 // enthalphy at T1 in kJ/kg
+hf2 = 125.79 // enthalphy at T2 in kJ/kg
+sf1 = 1.3069 // entrophy at T1 in kJ/kg K
+sf2 = 0.4369 // entrophy at T2 in kJ/kg K
+sg1 = 7.3549 // entrophy at T1 in kJ/kg K
+
+// Calculations for determining mass of water
+//energy balance for quenching
+deff('y=mass(X)', 'y = ms*Cp*(T1-T2) - mw*(hf1-hf2) - 2257 * X')
+X = fsolve(0,mass) // Mass of water vaporised in kg
+
+// entropy change of steel block from T1 to T2 temperature
+Ss = ms*Cp*log(T2/T1)
+
+// entropy change of water from T1 to T2 temperature
+Sw = mw*(sf1-sf2) + X*(sg1-sf1)
+
+// entropy change of water from T1 to T2 temperature
+Su = Sw + Ss
+
+
+// Output Results
+mprintf('Entrophy change of steel block = %6.4f kJ/K', Ss)
+mprintf('\n Entrophy change of water = %6.4f kJ/K', Sw)
+mprintf('\n Entrophy change of steel block = %6.4f kJ/K', Su)
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