Abstract ▼ AI-Helper

A thermo hydraulic numerical model was developed to describe the refrigerant-to-air heat exchange in the Fin–and–Tube HEX that is widely used in refrigeration systems. The purpose of this study is to improve the numerical model of the Fin–and–Tube heat exchanger for air conditioners. The equations o...

A thermo hydraulic numerical model was developed to describe the refrigerant-to-air heat exchange in the Fin–and–Tube HEX that is widely used in refrigeration systems. The purpose of this study is to improve the numerical model of the Fin–and–Tube heat exchanger for air conditioners. The equations of mass, energy, and momentum were completely separated for vapor and liquid in a two-phase thermal fluid flow. The model was validated by analyzing experimental data based on the temperature and pressure of the refrigerant. To verify the validity of numerical analysis model, a heat pump test apparatus was installed. The pressure and temperature of the inlet and outlet of the HEX were measured according to the changes in compressor frequency and fan speed. The numerical results of superheating, temperature, and pressure distributions in each zone in the Fin-and-Tube structure were estimated using the input variables. The maximum errors in temperature difference and pressure were within 5°C and 4%, respectively. In the case of outlet pressure of the refrigerant, the temperature difference was less than a maximum of 5°C, and in the case of outlet temperature, the relative error was calculated to be less than a maximum of 4%. The errors in the calculation results for SH and SC were measured to be less than 1.5°C.

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