Evaluación del rendimiento de un sistema de refrigeración por compresión de vapor en función de la carga del refrigerante

Abstract

The estimation of the refrigerant charge of the compression refrigeration systems is important because a refrigerant charge above or below the nominal load negatively affects the performance of the system and may cause damage to its components. This paper describes a R600a refrigerant charge estimation method that provides the best performance in a direct expansion solar assisted pump that operates under a vapor compression refrigeration system. In the first instance, by means of the Nomogram method, which depends on the volumetric capacity of the evaporator and condenser, it was determined that the system operates with an optimum refrigerant load of 84.2 g with an error of 5%. For the experimental validation, tests were performed varying the refrigerant charge from 20 to 120 in intervals of 20g, during which water was used as heat transfer medium in the condenser; the temperature of the water rose from 18 to 50 ° C in an approximate time of 66 minutes. Finally, in this work the obtained data was graphically analyzed, which show the behavior of the cooling system with respect to the different meteorological parameters and how the performance of the system is affected according to the amount of refrigerant.