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+// Display mode

+mode(0);

+// Display warning for floating point exception

+ieee(1);

+clear;

+clc;

+disp("Engineering Thermodynamics by Onkar Singh Chapter 10 Example 10")

+m=4;//mass of fuel consumed in kg

+N=1500;//engine rpm

+mw=15;//water circulation rate in kg/min

+T1=27;//cooling water inlet temperature in degree celcius

+T2=50;//cooling water outlet temperature in degree celcius

+ma=150;//mass of air consumed in kg

+T_exhaust=400;//exhaust temperature in degree celcius

+T_atm=27;//atmospheric temperature in degree celcius

+Cg=1.25;//mean specific heat of exhaust gases in KJ/kg K

+n_mech=0.9;//mechanical efficiency

+T=300*10^-3;//brake torque in N

+C=42*10^3;//calorific value in KJ/kg

+Cw=4.18;//specific heat of water in KJ/kg K

+disp("brake power(BP)=2*%pi*N*T in KW")

+BP=2*%pi*N*T/60

+disp("so brake power=47.124 KW")

+disp("brake specific fuel consumption(bsfc)=m*60/(mw*BP) in kg/KW hr")

+bsfc=m*60/(mw*BP)

+disp("indicated power(IP)=BP/n_mech in Kw")

+IP=BP/n_mech

+disp("indicated  thermal efficiency(n_ite)=IP*mw*60/(m*C)")

+n_ite=IP*mw*60/(m*C)

+disp("in percentage")

+n_ite=n_ite*100

+disp("so indicated thermal efficiency=28.05%")

+disp("heat available from fuel(Qf)=(m/mw)*C in KJ/min")

+Qf=(m/mw)*C

+disp("energy consumed as brake power(BP)=BP*60 in KJ/min")

+BP=BP*60 

+disp("energy carried by cooling water(Qw)=mw*Cw*(T2-T1)in KJ/min")

+Qw=mw*Cw*(T2-T1)

+disp("energy carried by exhaust gases(Qg)=(ma+m)*Qg*(T_exhaust-T_atm)/mw in KJ/min")

+Qg=(ma+m)*Cg*(T_exhaust-T_atm)/mw

+disp("unaccounted energy loss in KJ/min")

+Qf-(BP+Qw+Qg)

+disp("NOTE=>Heat balance sheet on per minute basis is attached as jpg file with this code.")

+

+

+

+

+