blob: 4d18c229e3b0aa95b5205cb2da644c2e53e53a40 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
|
//(3.11) Air undergoes a polytropic compression in a piston–cylinder assembly from p1 = 1 bar, T1 = 22C to p2 = 5 bars. Employing the ideal gas model, determine the work and heat transfer per unit mass, in kJ/kg, if n = 1.3.
//solution
//variable initialization
p1 = 1 //initial pressure in bar
T1 = 295 //initial temperature in kelvin
p2 = 5 //final pressure in bar
n=1.3 //polytropic constant
R = 8314/28.97 // gas constant for air in SI units
T2 = T1*(p2/p1)^((n-1)/n)
w = R*(T2-T1)/(1-n)
printf('the work done per unit mass in KJ/Kg is :\n\tW = %f',w/1000)
//from table A-22
u2 = 306.53
u1 = 210.49
Q = u2-u1+w/1000
printf('\n\nthe heat transfer per unit mass in KJ/Kg is:\n\t Q = %f',Q)
|
