In this book, published experimental data, tabtes, and equations for four freons are systematized and critically assessed. The freons of the methane series are: freon-20, 21, 22, 23. Based on the analysis of the most reliable data, the authors compiled equations from which comprehensive tables of thermophysical properties of the said substances are computed in a temperature interval from normal boiling point to 473 K and in apressure interval from 0.1 to 20 MPa. The overwhelming majority of these tables are published for the first time.The book is intended for the staff of science-research and designconstruction organizations; for researehers in thermophysics, cryogenics and chernical technology; and could be used by educators, graduate students, and students of physicochernical engineering disciplines.This book contains 53 tables and 38 illustrations.

A modified capillary tube method has been used to measure viscosities Ibr HFC-32 over a temperature range from -20 to 90°C and a pressure range from 0.I to 5.3 MPa, and for the liquid mixtures of HFC-32 with a synthetic polyolester oil at temperatures from 20 to 75°C and oil mass fractions from 0.44 to 1. Estimated uncertainties in the measured viscosities do not exceed + 1.2 and + 1.8% for the pure fluocarbon and the mixtures, respectively. It is found that viscosity isotherms for HFC-32 at subcritical temperatures exhibit a minimum with increasing pressure, with the viscosity decreasing as much as 10% relative to its value at one atmosphere. Correlations are presented for dilute gas viscosities, excess viscosities, and saturated liquid and vapor viscosities. These correlations are shown to fit our data within experimental uncertainties. For HFC-32/lubricant mixtures, a free-volume viscosity model has been applied to correlate the experimental data.

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