Fecha límite para el envío de resumenes: 21/Abril/2024

Currently, in the world, there is a real race, involving several manufacturers, in the search for more efficient refrigerant fluids, with the need to develop new refrigerant fluids, to replace the fluids that are being used in air conditioning and refrigeration systems, aiming to maintain or improve the performance of such systems, reducing their electrical energy consumption. Therefore, this work intends to be another contribution to this scenario and aims to carry out an exergy analysis comparing the operating characteristics of a residential Chiller system, in which the natural fluid Propane (R-290) was used, operating at 60 Hz (normal frequency), and at 70 Hz (with inverter controller). The refrigerant R-290 was compared with the HCFC fluid R-22 in the same indirect expansion refrigeration system. For comparison purposes, the main operating parameters of a refrigeration or air conditioning system were observed, such as pressures and temperatures, electrical energy consumption and exergy of the system components. Analysis of the Coefficient of Performance (COP) and system exergy showed that the high frequency (70 Hz) caused total energy waste to increase by 30% compared to R-22 refrigerant. When working with both fluids at 60 Hz, the only negative point for the natural fluid was the higher suction pressure, indicating that the chilled water temperatures were lower with R-22. Under normal conditions, the results expected in this work were obtained, in which the natural fluid showed satisfactory behavior, with values higher than those obtained for the synthetic fluid, for local psychrometic conditions, being another alternative for replacing R-22 in systems air conditioning and refrigeration.

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