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Diffstat (limited to '1226/CH3/EX3.14/EX3_14.sce')
| -rwxr-xr-x | 1226/CH3/EX3.14/EX3_14.sce | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/1226/CH3/EX3.14/EX3_14.sce b/1226/CH3/EX3.14/EX3_14.sce new file mode 100755 index 000000000..b41dffa24 --- /dev/null +++ b/1226/CH3/EX3.14/EX3_14.sce @@ -0,0 +1,16 @@ +clc;funcprot(0);//EXAMPLE 3.14
+// Initialisation of Variables
+t1=310;................//Min temperature in K
+t3=1220;................//Max temperature in K
+ga=1.4;................//Ratio of specific heats for air
+cph=5.22;............//Specific heat at constant volume for helium in kJ/kg
+cvh=3.13;...............//Specific heat at constant pressure for helium in kJ/kg
+//Calculations
+r=(t3/t1)^(1/((ga-1)*2));..............//Compression ratio
+etaotto=1-(1/(r^(ga-1)));................//Air standard efficiency
+gah=cph/cvh;................//Ratio of specific heats for Helium
+rh=(t3/t1)^(1/((gah-1)*2));..............//Compression ratio when Helium is used
+etaottoh=1-(1/(rh^(gah-1)));................//Air standard efficiency when Helium is used
+disp(etaotto*100,"Air standard efficiency of the engine in %:")
+if ((round (etaotto)- round (etaottoh)) == 0) then disp("There is no change in efficiency when Helium is used as working fluid instead of air")
+end
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