Heat duty of a shell and tube heat exchanger|POLVER05_1    |POLVER05_1
f(Q)=U*A*(DT2-DT1)/ln(DT2/DT1)-Q   #
DT1=T1-t1-Q/(M*Cp)  #
DT2 = T1-t1-Q/(m*cp)  #
M=43800.0   #
m=149000.0   #
Cp=0.605   #
U=55.0   #
A=662.0   #
T1=390.0   #
t1=100.0   #
cp=0.49   #
Q(min)=1000000, Q(max)=7000000