diff options
Diffstat (limited to '2063/CH10/EX10.5/10_5.sce')
| -rwxr-xr-x | 2063/CH10/EX10.5/10_5.sce | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/2063/CH10/EX10.5/10_5.sce b/2063/CH10/EX10.5/10_5.sce new file mode 100755 index 000000000..63b2ca755 --- /dev/null +++ b/2063/CH10/EX10.5/10_5.sce @@ -0,0 +1,22 @@ +clc
+clear
+//Input data
+T2=298;//Maximum temperature at which CO2 machine works in K
+T1=268;//Minimum temperature at which CO2 machine works in K
+sf1=-0.042;//Liquid entropy at 268 K in kJ/kg K
+hfg1=245.3;//Latent heat of gas at 268 K in kJ/kg
+sf2=0.251;//Liquid entropy in kJ/kg K
+hfg2=121.4;//Latent heat of gas at 298 K in kJ/kg
+hf1=-7.54;//Liquid enthalpy at 268 K in kJ/kg
+hf2=81.3;//Liquid enthalpy at 298 K in kJ/kg
+hf3=81.3;//Enthalpy at point 3 in graph in kJ/kg
+
+//Calculations
+s2=sf2+(hfg2/T2);//Entropy at point 2 from the graph in kJ/kg K
+x1=(s2-sf1)/(hfg1/T1);//Dryness fraction at point 1
+h1=hf1+(x1*hfg1);//Enthalpy at point 1 in kJ/kg
+h2=hf2+hfg2;//Enthalpy at point 2 in kJ/kg
+COP=(h1-hf3)/(h2-h1);//Coefficient of performance for a CO2 machine working at given temperatures
+
+//Output data
+printf('Theoretical COP for a CO2 machine working at given temperatures is %3.2f',COP)
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