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+clc;funcprot(0);//EXAMPLE 20.2

+// Initialisation of Variables

+N=300;............//Compressor rpm

+afr=15;.........//Air fuel ratio

+etamech=0.85;....//Mechanical efficiency

+etamt=0.9;.......//Motor transmission efficiency

+v=1;............//Volume dealt with per min at inlet in m^3/min

+rld=1.5;........//Ratio of stroke to diameter

+v1=1;.........//Volume of air taken in m^3/min

+p1=1.013;...............//Intake pressure in bar

+t1=288;...............//Intake temperature in K

+p2=7;......................//Delivery pressure in bar

+n=1.35;..............//Adiabatic index

+R=287;..............//Gas constant in kJ/kgK

+//Calculations

+m=(p1*v1*10^5)/(R*t1);..............//Mass of air delivered per min in kg

+t2=t1*((p2/p1)^((n-1)/n));...........//Delivery temperature in K

+iw=(n/(n-1))*m*R*(t2-t1);............//Indicated work in kJ/min

+IP=iw/(60*1000);....................//Indicated power in kW

+vdc=v/N;........//Volume drawn in per cycle in m^3

+D=(vdc/((%pi/4)*rld))^(1/3);..........//Cylinder bore in m

+disp(D*1000,"Cylinder bore in mm:")

+pc=IP/etamech;.........//Power input to the compressor in kW

+mp=pc/etamt;..........//Motor power in kW

+disp(mp,"Motor power in kW:")