Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
ENC-2022-0369 TRANSIENT ASSESSMENT OF LOW-GWP FLUIDS IN A TWO-STAGE REFRIGERATION SYSTEM
Submission Author:
Leonardo Monteiro de Carvalho , SP
Co-Authors:
Leonardo Monteiro de Carvalho, Guilherme Borges Ribeiro
Presenter: Leonardo Monteiro de Carvalho
doi://10.26678/ABCM.ENCIT2022.CIT22-0369
Abstract
Efficient thermal management is particularly needed in electric vehicles because it can substantially increase the range and lifespan of the battery. An engineering approach to address this issue is using numerical analysis. In this study, a transient model was proposed for the refrigeration system of the battery and cabin of an electric vehicle using MATLAB and REFPROP. The refrigeration cycle is based on vapour compression of the refrigerant. The refrigerant fluids considered in the analysis are R-134a, R-1234ze, R-1234yf, and R-32. It was considered the volumetric refrigerant effect for each fluid, in order to make a reasonable comparison between them. The system consists of a compressor, condenser, expansion valve, and evaporator with a heat exchanger between the exit of the condenser and the exit of the evaporator. There is one evaporator for both the cabin and battery. The psychrometric properties of humid air were used to evaluate the thermodynamic properties and calculate mass diffusion. The thermodynamic properties of the fluid were calculated using REFPROP linked with MATLAB. The results provide a relevant computing code for the evaluation of vapour compression cycles and compares the performance of different refrigerant fluids.
Keywords
Vapor Compression refrigeration System, electric vehicle, Automotive Air Conditioning, automotive air conditioning system
