Interactive method for heat exchangers calculating taking into account phase transitions

Makhanko Anatoli V., Makhanko Andrei A., Sokolova Galina P., Blagov Alexey E.

The article proposes to expand the interactive method for calculating heat exchangers for cases of the presence of evaporation and condensation of heat carriers in the process of heat exchange. This method allows the most complete modeling of the heat exchangers operation for various designs, taking into account geometric, gas-hydrodynamic and many other factors. This method is based on a mathematical description of heat transfer processes in individual elementary sections of the heat exchanger, into which its geometric model is divided in order to increase the accuracy of the calculation. The main assumption made in the construction of this method is that, within one elementary section of the heat exchanger, the phase states of the mediums participating in heat exchange are invariable. Accordingly, to increase the adequacy of the calculation, this requires an increase in the number of elementary sections, and, consequently, a decrease in their size and an increase in the computation time.

Keywords:heat transfer, calculation, numerical methods, phase transition, evaporation, condensation.