Abstract
A very high accuracy, straight vibrating tube type of density flowmeter was used online to measure oil concentrations of flowing R-134a/oil mixtures. The calibrations covered oil concentrations from 0 to 6% (by mass) oil over the temperature range from −9.4 to 5.9°C. The oil concentrations were correlated statistically as a function of density, temperature, and liquid compressibility to an average error of 0.09% (by mass) oil, with a 95% confidence limit of 0.21% (by mass) oil. In addition, a simplified method not requiring calibration tests was developed for general industrial application of the density flowmeter to any refrigerant-oil mixture combination, with an average error of 0.22% (by mass) oil and a 95% confidence limit of 0.67% (by mass) oil for the present data set.
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