Refrigeration cycles expansion analysis and study and their influence on the energy efficiency coefficient by comparing analytical calculation, simulations and experimental tests in a CO2 laboratory

This paper presents an analysis and study pertormed on the influence of the expansion devices in the coetti­ cient of energy etticiency in vapor compression retrigeration cycles, since this type of facilities far cold production of cold using this type of cycles represents a high percentage of energy consumption. The study used mathematical models which can simu­ late and predict their behavior through an analysis on the change of overheating, and its influence on the energy efficiency coefficient. Two types of electronic expansion valves were compared: the pulsed and continuous, through simulations with the software for refrigeration CoolPack; analytical calculations and execution of experimental tests; knowing that to achieve an energy reduction next operation should have a limit of thermodynamic efficiency.