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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 12 Example 8")

+mc=20;//mass of oil in kg/min 

+Tc_out=100;//initial temperature of oil in degree celcius

+Th_in=30;//final temperature of oil in degree celcius

+Th_out=25;//temperature of water in degree celcius

+Cpc=2;//specific heat of oil in KJ/kg K

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

+mh=15;//water flow rate in kg/min

+U=25;//overall heat transfer coefficient in W/m^2 K

+disp("This oil cooler has arrangement similar to a counter flow heat exchanger.")

+disp("by heat exchanger,Q=U*A*LMTD=mc*Cpc*(Tc_out-Th_in)=mh*Cph*(Tc_in-Th_out)")

+disp("so Q in KJ/min")

+Q=mc*Cpc*(Tc_out-Th_in)

+disp("and T=Th_out+(Q/(mh*Cph))in degree celcius")

+T=Th_out+(Q/(mh*Cph))

+disp("LMTD=(deltaT_in-deltaT_out)/log(deltaT_in/deltaT_out)in degree ")

+disp("here deltaT_in=Tc_out-T in degree celcius")

+deltaT_in=Tc_out-T

+disp("deltaT_out=Th_in-Th_out in degree celcius")

+deltaT_out=Th_in-Th_out

+disp("so LMTD in degree celcius")

+LMTD=(deltaT_in-deltaT_out)/log(deltaT_in/deltaT_out)

+disp("substituting in,Q=U*A*LMTD")

+disp("A=(Q*10^3/60)/(U*LMTD)in m^2")

+A=(Q*10^3/60)/(U*LMTD)

+disp("so surface area=132.85 m^2")