5 files changed, 77 insertions, 0 deletions
diff --git a/167/CH12/EX12.1/ex1.sce b/167/CH12/EX12.1/ex1.sce
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index 000000000..bb175f548
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+++ b/167/CH12/EX12.1/ex1.sce
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+//example 1
+//Approximating Differential Quantities by Differences
+clear
+clc
+h305=305.22 //Specific Enthalpy at 305 K in kJ/kg
+h295=295.17 //Specific Enthalpy at 205 K in kJ/kg
+dh=h305-h295 //Chnage in Specific Enthalpy
+dT=305-295 //Change in Temp. in kelvins
+cp=dh/dT //Specific heat of air at 300K in kJ/kg-K
+printf("\n Hence, the specific heat of air at 300 K is = %.3f kJ/kg-K. \n",cp);
+\ No newline at end of file
diff --git a/167/CH12/EX12.11/ex11.sce b/167/CH12/EX12.11/ex11.sce
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index 000000000..d451fee2d
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+++ b/167/CH12/EX12.11/ex11.sce
@@ -0,0 +1,31 @@
+//example 11
+//dh and ds of Oxygen at High Pressures
+clear
+clc
+T1=220 //Initial Temp. in K
+P1=5 //Initial Pressure in MPa 
+T2=300 //Final Temp.in K 
+P2=10// Final Pressure in MPa
+h2ideal=8736//in kJ/mol
+h1ideal=6404 //in kJ/mol
+Ru=8.314 //Universal Gas constant in kJ/kmol-K
+s2o=205.213 //in kJ/kmol-K
+s1o=196.1712 //in kJ/kmol-K
+Tcr=154.8 //Critical Temp. in K
+Pcr=5.08 //Critical Pressure in MPa
+Tr1=T1/Tcr //Reduced initial temp. 
+Pr1=P1/Pcr //Reduced initial pressure 
+Tr2=T2/Tcr//Reduced final Temp.
+Pr2=P2/Pcr //Reduced Final Pressure
+Zh1=0.53
+Zs1=0.25
+Zh2=0.48
+Zs2=0.20
+dhi=h2ideal-h1ideal// Enthalpy change by assuming ideal gas behaviour
+dhn=dhi-Ru*Tcr*(Zh2-Zh1) //Enthalpy change by accounting for deviation from ideal gas behaviour
+dsi=s2o-s1o-Ru*log(P2/P1)// Entropy change by assuming ideal gas behaviour
+dsn=dsi-Ru*(Zs2-Zs1)//Entropy change by accounting for deviation from ideal gas behaviour
+printf(" Hence, by assuming ideal gas behaviour, enthalpy change is = %.0f kJ/kmol ",dhi);
+printf("and entropy change is = %.2f kJ/kmol-K. ",dsi);
+printf("\n By accounting for deviation from ideal gas behaviour, enthalpy change is=%.0f kJ/kmol ",dhn);
+printf("and entropy change is = %.2f kJ/kmol-K. \n",dsn);
+\ No newline at end of file
diff --git a/167/CH12/EX12.2/ex2.sce b/167/CH12/EX12.2/ex2.sce
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index 000000000..5157361d7
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+++ b/167/CH12/EX12.2/ex2.sce
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+//example 2
+//Total Differential versus Partial Differential
+clear
+clc
+R=0.287 //Universal gas constant kPa-m3/kg-K
+v=(0.86+0.87)/2 //average value m^3/kg
+T=(300+302)/2 //average temp. in kelvins
+dT=302-300 //change in tep. in K
+dv=0.87-0.86 //change in volume in m^3/kg
+dP=R*dT/v-R*T*dv/v^2 //Change in the pressure in kPa
+printf("\n Hence, the change in the pressure of air is = %.3f kPa. \n",dP);
+\ No newline at end of file
diff --git a/167/CH12/EX12.5/ex5.sce b/167/CH12/EX12.5/ex5.sce
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index 000000000..83aabc92a
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+++ b/167/CH12/EX12.5/ex5.sce
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+//example 5
+//Evaluating the hfg of a Substance from the P-v-T Data
+clear
+clc
+vg=0.035969 //in m^3/kg
+vf=0.0008161 //in m^3/kg
+vfg=vg-vf //in m^3/kg at  20°C 
+dT=24-16 //change in Temp. in C
+Psat1=646.18 //saturation presssure at 24 C in kPa
+Psat2=504.58 //saturation pressure at 16C in kPa
+dP=Psat1-Psat2 //Difference between saturation pressures in kPa
+T=293.15 //Difference between temp. in K
+hfg=T*vfg*dP/dT //Enthalpy of vaporization in kJ/kg
+printf("\n Hence, the enthalpy of vaporization of refrigerant 134-a is = %.2f kJ/kg. \n",hfg);
+\ No newline at end of file
diff --git a/167/CH12/EX12.6/ex6.sce b/167/CH12/EX12.6/ex6.sce
new file mode 100755
index 000000000..eb7296b91
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+++ b/167/CH12/EX12.6/ex6.sce
@@ -0,0 +1,11 @@
+// example 6
+//Extrapolating Tabular Data with the Clapeyron Equation
+clear
+clc
+hfg=97.100 //in Btu/lbm
+R=0.01946 //universal Gas constant in Btu/lbm-R
+T1=420 //in R
+T2=410 //in R
+P1=7.432 //in psia
+P2=%e^((hfg/R)*(1/T1-1/T2)+log(P1)) //Saturation pressure at -50R in psia
+printf("\n Hence, the Saturation Pressure of Refrigerant 134-a at -50 R  is = %.2f psia. \n",P2);
+\ No newline at end of file