Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
MOVING BOUNDARY MODEL FOR A GAS COOLER OF A CO2 HEAT PUMP
Submission Author:
Sara Isabel de Melo Resende , MG
Co-Authors:
Sara Isabel de Melo Resende, Ivana de Fátima Braga, Luiz Machado, Raphael Nunes Nunes de Oliveira
Presenter: Sara Isabel de Melo Resende
doi://10.26678/ABCM.COBEM2019.COB2019-1196
Abstract
Recently, the use of natural fluids such as CO2 in heat pumps for residential water heating has proved to be an ecologically alternative, especially due to the high global warming potential and ozone depletion layer of traditional fluids such as CFCs and HCFCs. This work aims to develop the mathematical model for the cooler of a solar heat pump operating with CO2 using the moving boundary modeling. The model was built using the Fortran® programming language based on the equations of conservation of mass, energy and momentum and considering unidimensional, transient and with pressure drop flow. The model provides important variables for the CO2 heat pump such as the water outlet temperature, the COP of the cycle, the CO2 and water convection heat transfer coefficients and others variables. The model validation was realized by comparing the theoretical output data with experimental data from the literature. It observes a good agreement between these results, with a maximum deviation of 4.8% for the outlet temperature and 0.5% for the high pressures of the cycle. The comparative study allowed to conclude that the mathematical model presents good agreement results becoming an important tool to predict the dynamic behavior of the heat exchanger.
Keywords
Dynamic model, Moving boundary model, CO2, Gas cooler
