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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 /1226/CH17/EX17.30/EX17_30.sce | |
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initial commit / add all books
Diffstat (limited to '1226/CH17/EX17.30/EX17_30.sce')
| -rwxr-xr-x | 1226/CH17/EX17.30/EX17_30.sce | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/1226/CH17/EX17.30/EX17_30.sce b/1226/CH17/EX17.30/EX17_30.sce new file mode 100755 index 000000000..b7cb36c73 --- /dev/null +++ b/1226/CH17/EX17.30/EX17_30.sce @@ -0,0 +1,21 @@ +clc;funcprot(0);//EXAMPLE 17.30
+// Initialisation of Variables
+n=1;.......................//No of cylinders
+D=0.18;...................//Engine bore in m
+L=0.34;....................//Engine stroke in m
+N=400;......................//Engine rpm
+mepw=6.4;.................//Mean effective pressure of working loop in bar
+mepp=0.36;..................//Mean effective pressure of pumping loop in bar
+mepd=0.64;.................//Mean effective pressure (dead cycle) iin bar
+fs=46;................//Firing strokes per min
+//calculations
+pminet=mepw-mepp;..........//Net indicated mean effective pressure in bar
+dc=(N/2)-fs;...............//Dead cycles per min
+IPnet=(n*pminet*(%pi/4)*L*D*D*fs*4*10)/6;.............//Net indicated power output in kW
+ppdc=(n*pminet*L*(%pi/4)*D*D*10*dc)/6;.............//Pumping power of dead cycles in kW
+FP=IPnet-ppdc;...........................//Frictional power in kW
+IP=(n*pminet*L*(%pi/4)*D*D*(N/2)*10)/6;...............//Indicated power in kW
+BP=IP-FP;..................//Brake power in kW
+disp(BP,"Brake power (in kW):")
+etamech=BP/IP;.................//Mechanical efficiency
+disp(etamech*100,"Mechanical efficiency (in %):")
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