Influência da modelagem da condensação e evaporação do R410A na simulação de sistemas de ar condicionado tipo split

Abstract

This work aims to analyze the influence of the correlations of convective coefficients for the evaporation and condensation process in the simulation of a split air conditioning system operating with R410A in the steady state. The heat transfer between the R410A and the air in the evaporator and condenser is done by discretizing both into small sections. Then, the global heat transfer is evaluated locally, allowing the determination of the heat exchanged in each section. The humidity in the evaporator's louvered fins was considered for calculation. Computational modeling is developed in an open-source programming language called Python. In the present work, the thermophysical properties of the refrigerant fluid and humid air are obtained using the Coolprop open library database. Firstly, the computational implementation is validated through comparison with experimental data from the literature. Then, five correlations referring to the convective coefficient during condensation and four correlations during system evaporation are tested, and the effect of these correlations on the predictive capacity of the model to evaluate the consumed power, refrigeration capacity and performance coefficient (COP) of the system is analyzed. Finally, after determining the most satisfactory pair of correlations, an energetic and exergetic analysis of the system is carried out by varying the compressor frequency and external and internal temperatures.