Transformación de una válvula termostática en una válvula regulada electrónicamente mediante el control de la temperatura del elemento termostático. aplicación al estudio del comportamiento estático y dinámico de un ciclo simple de refrigeración

Abstract

The research work focused on the transformation of a conventional thermostatic expansion valve (TXV), into an electronically regulated valve by controlling the temperature in the bulb and the design of a thermostatic expansion valve prototype, in order to provide with an expansion device that could be able to match the performance of a commercial expansion valve. Their behavior was studied through a static and dynamic study in a simple refrigeration system. For which, an analysis was made by means of comparison of experimental data against a mathematical model of the refrigeration bench. The mathematical model was programmed to predict the behavior of the cooling system and thus determine the optimal operating conditions. The idea is to maintain the degree of superheating at the outlet of the evaporator regardless of the operating conditions of the cooling system. This is obtained by resistances that surround the bulb of the thermostatic expansion valve. The data computed by the mathematical model was validated with the experimental data measured in the refrigeration bench. Once the results have been analyzed and compared, it is determined that it is possible to control degree of superhating at the evaporator outlet accurately.