Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
ANALYSIS OF THE REFRIGERANT MASS CHARGE FOR A DIRECT EXPANSION SOLAR ASSISTED HEAT PUMP SYSTEM
Submission Author:
Sabrina Nogueira Rabelo , MG
Co-Authors:
Sabrina Nogueira Rabelo, Willian Moreira Duarte, Tiago de Freitas Paulino, Juan Jose Garcia Pabon, Luiz Machado
Presenter: Sabrina Nogueira Rabelo
doi://10.26678/ABCM.ENCIT2018.CIT18-0043
Abstract
The analysis of the amount of mass in a refrigeration system is directly related to the coefficient of performance of the cycle. The mass inventory of solar-assisted heat pumps is still more relevant because the evaporation temperature varies greatly according to the solar radiation flux. In that way, a mass charge model for DX-SAHP operating with CO2 is presented. The results show that a greater solar energy input in the system increases the evaporation temperature, because of that the total mass of the refrigerant in the system need to be increased. The solar evaporator and the gas cooler demonstrated to be the mostly important thermal devices for the mass inventory analysis, which had more than 85% of the total mass of the system. In addition, the mass charge demonstrated a significatigly related to the discharge pressure of the system and the COP.
Keywords
mass charge, Refrigeration, CO2 heat pump, solar radiation, coefficient of performance
