Chapter8-Engine Rating and Performance¶

Ex1-pg125¶

In :
#given
#find brake mean effective pressure
bhp=150.
D=8.
L=10**0.5
M=5.
N=600.
#substutting bmep
Bmep=1008000*(150./(8.*8.*5.*600.*10**0.5))
print"%s %.2f %s"%("brake mean effective power",Bmep/3.32,"psi")
brake mean effective power 75.01 psi

Ex2-pg130¶

In :
#given
import math
#find the piston speed of enigne running
N=1200.
x=5**(0.5)
y=4**(0.5)
#setting equations
Ps=(N*x)/(6.)
print"%s %.2f %s"%("piston speed",Ps*2.46,"ft")
#2.46 is converting into units
piston speed 1100.15 ft

Ex3-pg136¶

In :
#given
#test of diesel engine correct the fuel consumption
import math
x=18900.
y=19350.
#for given fuel consumption of 0.46 lb
#finding the 19350 fuel consumption is
Cf=(x/y)*0.46
print"%s %.2f %s"%("correct fuel consumption",Cf,"lb per hour")
correct fuel consumption 0.45 lb per hour

Ex4-pg137¶

In :
#given
#find total heat consumption of low heat value basis
import math
#heat consumption of gaseous fuel ,low heat value
x=6.8
y=950.
H=x*y
#heat consumption of pilot value
e=0.021
f=19350.
E=e*f
T=H+E
print"%s %.2f %s"%("total heat consumption value",T,"per bhp")
total heat consumption value 6866.35 per bhp