The model is for a tube heat exchanger that can have several passes and extended surface, in an undefined external flowing media. We need to specify the global U, as it is impossible its calculation. We define also the internal media. For the external media only Cp, inlet temperature, and outlet temperature (or mass flow rate) are needed.As an alternative it is also possible to use a fixed exchanged power, or a fixed temperature for the tubes external surface. And, for better convergence when the exchanger is not in use, switch the pipes to isenthalpic or adiabatic.
If the exchanger type is undefined, a global LMTD will be used for the exchanged heat calculation, otherwise a mixed NTU/LTMD method will be used.
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.FreeFluids.HeatExchangers.HEXgeneric1Ph