initial commit / add all books

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diff --git a/2063/CH7/EX7.20/7_20.sce b/2063/CH7/EX7.20/7_20.sce
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+clc

+clear

+//Input data

+D=0.6;//Brake wheel diameter of a constant speed compression ignition engine operating on four stroke cycle in m

+t=0.01;//Thickness of brake band in m

+N=500;//Operating speed of the engine in rpm

+W=20;//Load on brake band in kgf

+S=3;//Spring balance reading in kgf

+l=6.25;//Length of indicator diagram in cm

+A=4.35;//Area of indicator diagram in cm^2

+Sn=11;//Spring number in kgf/cm^2/cm

+d=10;//Diameter of the bore in cm

+L=0.13;//Length of the stroke in m

+F=0.23;//Specific fuel consumption in kg/BHP hr

+CV=10000;//Heating value of fuel in kcal/kg

+

+//Calculations

+BHP=(3.14*(D+t)*N*(W-S))/4500;//Brake horse power in kW

+MEP=(A*Sn)/l;//Mean effective pressure in kgf/cm^2

+Ar=(3.14*d^2)/4;//Area of the cylinder in cm^2

+np=N/2;//Number of explosions per minute

+IHP=(MEP*L*Ar*np)/4500;//Indicated horse power in kW

+nm=(BHP/IHP)*100;//Mechanical efficiency in percentage

+Wf=F*BHP;//Fuel consumption per hr in kg/hr

+nt=((IHP*4500*60)/(Wf*CV*427))*100;//Indicated thermal efficiency in percentage

+nb=((BHP*4500*60)/(Wf*CV*427))*100;//Brake thermal efficiency in kW

+

+//Output

+printf('(a)The brake horse power is %3.2f kW\n (b)Indicated horse power is %3.3f kW\n (c)Mechanical efficiency is %3.1f percent\n (d)Indicated thermal efficiency is %3.0f percent\n (e)Brake thermal efficiency is %3.1f percent',BHP,IHP,nm,nt,nb)