Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
EXPERIMENTAL ANALYSIS OF THE OPERATION CONTROL OF A REFRIGERATING MACHINE
Submission Author:
João Marcos Gomes Vieira , MG , Brazil
Co-Authors:
Neylor Makalister Ribeiro Vieira, Lucas Divino Alves, Hélio Augusto Goulart Diniz, João Marcos Gomes Vieira, Antônio Maia
Presenter: João Marcos Gomes Vieira
doi://10.26678/ABCM.ENCIT2018.CIT18-0109
Abstract
In a vapor compression refrigeration cycle, the superheating degree is of vital importance for the proper operation of the compressor and maintenance of the system good performance. The purpose of this work was to analyze the superheating degree control in an evaporator of an air-to-air refrigerating machine by means of a thermostatic expansion valve. A temperature step was applied to the secondary fluid surrounding the evaporator by the activation of an electric resistor. A study of the behavior of the main operating parameters of the system was carried out. With the sudden increase in the temperature of the secondary fluid, the refrigerant flow at the evaporator inlet initially decreases. The thermostatic valve responds by increasing the flow imposed by the compressor, thus reducing the machine overheating. With this work, it was possible to analyze the thermostatic valve performance to find a new equilibrium point for the machine, stabilizing the refrigerant flow in the evaporator.
Keywords
Refrigerating machine, thermostatic expansion valve, superheating degree
