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Diffstat (limited to '572/CH3/EX3.8/c3_8.sce')
| -rwxr-xr-x | 572/CH3/EX3.8/c3_8.sce | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/572/CH3/EX3.8/c3_8.sce b/572/CH3/EX3.8/c3_8.sce new file mode 100755 index 000000000..e8147395f --- /dev/null +++ b/572/CH3/EX3.8/c3_8.sce @@ -0,0 +1,18 @@ +//(3.8) A piston–cylinder assembly contains 0.9 kg of air at a temperature of 300K and a pressure of 1 bar. The air is compressed to a state where the temperature is 470K and the pressure is 6 bars. During the compression, there is a heat transfer from the air to the surroundings equal to 20 kJ. Using the ideal gas model for air, determine the work during the process, in kJ.
+
+//solutiion
+
+//variable initialization
+m = .9 // mass of air in kg
+T1 = 300 // initial temperature in kelvin
+P1 = 1 // initial pressure in bar
+T2 = 470 // final temperature in kelvin
+P2 = 6 // final pressure in bar
+Q = -20 // heat transfer in kj
+
+//from table A-22
+u1 = 214.07 // in KJ/kg
+u2 = 337.32 // in KJ/Kg
+deltaU = m*(u2-u1) // change in internal energy in kj
+W = Q - deltaU // in KJ/kg
+printf('the work during the process in KJ is \n\t W = %f',W)
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