Análise experimental de um ciclo de refrigeração com uso de ejetor bifásico e separador de líquido do tipo T

Abstract

This work presents an experimental study of a refrigeration cycle with a two-phase ejector for energy recovery with the R-134a refrigerant, specifically the cycle proposed by Gay. This cycle was carried out with a liquid separator with T-junction and a visualization section designed to analyze the flow patterns. Experimental tests were performed analyzing the refrigerant charge in the system and its influence on the cycle parameters. With a refrigerant load of 4,600 g, an analysis of the compressor rotation, the inlet air temperature in the evaporator and the influence of the expansion valve opening and its consequences on the system was carried out. With the analysis of the refrigerant charge in the system, it was observed that the amount of mass considerably influences the power of the compressor and the thermal power of the condenser, but it is not very effective in the flow of the secondary nozzle. The analysis of the influence of compressor rotation and temperatures, together with a thermographic analysis, allowed the identification of reverse flow in the ejector. The liquid separator presented in all experimental tests stratified flow in the inlet section and phase separation in the vertical section, being possible to identify through images the phase separation in its body.