solve a Heat ex changer question and its showing it has a Algebraic Loops error

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It is a counterflow hot gas and air heat exchanger,we have three unknowns and three equations.
the input are:
T1IN: temperature of hot gas
T2IN: temperature of air
M1DOT: mass flow rate of gas
M2DOT; mass flow rate of air
C1: heat capacity of has
C2: heat capacity of air
U: heat transfers coefficient
A: heat transfer surface area
the output are
Q:
T1OUT: gas temperature out
T2OUT: air temperature out
Three equations:
Q=C1*M1*(T1IN-T1OUT)
Q=C2*M2*(T2OUT-T2IN)
Q={U*A*(T1OUT-T2IN-T1IN+T2OUT)}/{LN(T1OUT-T2IN)/(T1IN-T2OUT)}

回答(2 个)

Radha Krishna Maddukuri
Hello,
I see that you have met with an algebraic loop in your Simulink Model.
To eliminate this message, you can do the following: Configuration Parameters(Ctrl+E) --> Diagnostics --> Algebraic Loop --> choose none from the drop-down.
However, as the error message points out, it is not a good practice to have Algebraic Loops in your model.
Therefore I suggest you to go through the following solution by MathWorks Support Team:
This solution gives a clear understanding of Algebraic loops, and it also sheds light on resolving them with better practices for modelling.
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Radha Krishna Maddukuri
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MUHAMMED FASIL
MUHAMMED FASIL 2015-8-4

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