In [1]:

```
import math
#Input data
d = 20. #Bore in cm
l = 38. #Stroke in cm
Vc = 900. #Clearance volume in c.c
p1 = 1. #Pressure at the start of compression stroke in kg/cm**2
T1 = 90.+273 #Temperature at the start of compression stroke in K
x = 0.75 #Piston travelled 0.75 of the compression stroke
n = 1.32 #Compression curve index
wa = 0.0125 #Weight of air in kg
#Calculations
Vs = (3.14/4)*d**2*l #Swept volume in c.c
V1 = (Vs+Vc) #Volume in c.c
V2 = (1-x)*Vs+Vc #Volume in c.c
p2 = p1*(V1/V2)**n #Pressure in kg/cm**2
T2 = (T1*(p2/p1)*(V2/V1)) #Temperature in K
W = ((p1*V1-p2*V2)/(n-1))*10**-2 #Workdone in kg.m
dI = wa*0.17*(T2-T1) #Change in internal energy in kcal
q = (dI+(W/427)) #Heat in kcal
#Output
print 'When the cylinder has travelled %3.2f of the compression stroke, \
\nThe volume is %3.0f c.c \
\nThe pressure is %3.2f kg/cm**2 \
\nTemperature is %3.0f K \
\nThe workdone on the gas is %3.2f kg.m \
\nChange in internal energy between the two points is %3.3f kcal'%(x,V2,p2,T2,W,dI)
```