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m=5000;%input('Enter the mass of water in kg -'); 
cpw=4.187;%Cp of water is taken as 4.187 KJ/kg K 
T1=300;%input('Enter the inital temperature of water in kelvin :- '); %water initial temperature 
Tinter1=250;%input('Enter the intermediate temperature of water in kelvin :- '); %first reservoir temperature 
T2=150;%input('Enter the final temperature of water in kelvin :- '); 
for m=1:5:30 
    Q1=m*cpw*(Tinter1-T1) 
    Q2=m*cpw*(T2-Tinter1); 
    deltaSwater= m*cpw*[log(Tinter1/T1)+log(T2/Tinter1)]; 
    deltaSreservoir1=-Q1/(Tinter1); 
    deltaSreservoir2=-Q2/(T2); 
    deltaSUniverse=deltaSwater+deltaSreservoir1+deltaSreservoir2; 
    disp('Analysis for TER and system') 
    fprintf('Heat transferred from TER1 to water is:- %f kJ \n',Q1) 
    fprintf('Heat transferred from TER2 to water is:- %f kJ \n',Q2) 
    fprintf('deltaSwater=%f kJ/K \n',deltaSwater) 
    fprintf('deltaSreservoir1= %f kJ/K\n',deltaSreservoir1) 
    fprintf('deltaSreservoir2= %f kJ/K\n',deltaSreservoir2) 
    fprintf('deltaSUniverse= %f kJ/K\n',deltaSUniverse) 
    plot(m,Q1,'-b') 
    hold on 
    plot(m,Q2,'og') 
    hold on 
    plot(m,deltaSwater,'* r') 
    hold on 
    plot(m,deltaSreservoir1,'+c') 
    hold on 
    plot(m,deltaSreservoir2,':m') 
    hold on 
    plot(m,deltaSUniverse,'xk') 
end

Q1 = -209.3500

Analysis for TER and system

Heat transferred from TER1 to water is:- -209.350000 kJ 

Heat transferred from TER2 to water is:- -418.700000 kJ 

deltaSwater=-2.902207 kJ/K 

deltaSreservoir1= 0.837400 kJ/K

deltaSreservoir2= 2.791333 kJ/K

deltaSUniverse= 0.726526 kJ/K

Q1 = -1.2561e+03

Analysis for TER and system

Heat transferred from TER1 to water is:- -1256.100000 kJ 

Heat transferred from TER2 to water is:- -2512.200000 kJ 

deltaSwater=-17.413243 kJ/K 

deltaSreservoir1= 5.024400 kJ/K

deltaSreservoir2= 16.748000 kJ/K

deltaSUniverse= 4.359157 kJ/K

Q1 = -2.3028e+03

Analysis for TER and system

Heat transferred from TER1 to water is:- -2302.850000 kJ 

Heat transferred from TER2 to water is:- -4605.700000 kJ 

deltaSwater=-31.924280 kJ/K 

deltaSreservoir1= 9.211400 kJ/K

deltaSreservoir2= 30.704667 kJ/K

deltaSUniverse= 7.991787 kJ/K

Q1 = -3.3496e+03

Analysis for TER and system

Heat transferred from TER1 to water is:- -3349.600000 kJ 

Heat transferred from TER2 to water is:- -6699.200000 kJ 

deltaSwater=-46.435316 kJ/K 

deltaSreservoir1= 13.398400 kJ/K

deltaSreservoir2= 44.661333 kJ/K

deltaSUniverse= 11.624417 kJ/K

Q1 = -4.3964e+03

Analysis for TER and system

Heat transferred from TER1 to water is:- -4396.350000 kJ 

Heat transferred from TER2 to water is:- -8792.700000 kJ 

deltaSwater=-60.946352 kJ/K 

deltaSreservoir1= 17.585400 kJ/K

deltaSreservoir2= 58.618000 kJ/K

deltaSUniverse= 15.257048 kJ/K

Q1 = -5.4431e+03

Analysis for TER and system

Heat transferred from TER1 to water is:- -5443.100000 kJ 

Heat transferred from TER2 to water is:- -10886.200000 kJ 

deltaSwater=-75.457388 kJ/K 

deltaSreservoir1= 21.772400 kJ/K

deltaSreservoir2= 72.574667 kJ/K

deltaSUniverse= 18.889678 kJ/K

Answer 1

[Torsten]

Works for me (see above).