Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Phase Equilibrium Data for R-290 + POE ISO 32 Mixtures between 283.15 and 343.15 K
Submission Author:
Luís Gustavo Medeiros De Luca , SC
Co-Authors:
Luís Gustavo Medeiros De Luca, fernando freitas czubinski, Jader Riso Barbosa Jr.
Presenter: Luís Gustavo Medeiros De Luca
doi://10.26678/ABCM.ENCIT2022.CIT22-0487
Abstract
Propane (R-290) and other natural fluids have been considered as promising drop in replacement solutions to conventional refrigerants due to their low Global Warming Potential (GWP). Organic Rankine Cycles (ORC) and commercial vapor compression refrigeration systems are some of the technologies that benefited from these solutions. The selection of the most suitable working fluids for refrigeration and ORC applications is based on a number of criteria, including lubricant oil solubility/miscibility. The lubricating oil used in expanders comes into contact with the working fluid and may migrate from the expander to other parts of the system, giving rise to some problems such as oil accumulation inside the heat exchanger tubes. Therefore, a deeper knowledge of the thermodynamic behavior of R-290/lubricant systems is essential for a proper oil selection used in expanders of ORC systems. To that end, the aim of the present work is to investigate experimentally the phase behavior of R-290/POE ISO 32 (Emkarate RL 32) binary mixtures. Experimental bubble point pressures for R-290/POE ISO 32 have been measured over a temperature range from 283 to 343 K with R-290 mole fractions ranging from 0.2 to 0.8. A total of 20 experimental points are reported with combined expanded uncertainties (k = 2) ranging from 1,5% to 18,1%. The main component of the apparatus consists of a variable inner volume synthetic apparatus equipped with two sapphire windows so that the phase behavior of the mixture can be evaluated. To validate the apparatus and the experimental procedure, measurements with carbon dioxide/R-1234yf binary system were conducted over the full temperature range and compared with published vapor-liquid equilibrium data. For each binary mixture, new binary interaction parameters are fitted for the Peng-Robinson and PC-SAFT (Perturbed Chain Statistical Associating Fluid Theory) equations of state using the obtained bubble point pressure data.
Keywords
Organic Rankine Cycle, phase equilibrium, mixture, Hydrocarbons, Lubricant oil
