Solubility of HFC‐134a refrigerant in glycol‐type compounds: Effects of glycol structure

Abstract

Environmental concerns have dictated the replacement of CFC-I2 refrigerant with HFC-134a in automotive air-conditioning ( A /C

Bubble pressure measurements for the (1,1,1,2-tetrafluoroethane+triethylene glycol dimethyl ether) system

“…This is an evident disagreement with the behaviour found here. We are confident that our results are correct, also because a behaviour similar to the present one was verified for the analogous system (R134a + tetraethylene glycol dimethyl ether) by Tseregounis and Riley [1], who reported a figure similar to our figure 4. The largest negative deviations from Raoult's law were found at the lower temperatures also by Coronas et al [3] for the same mixture and by Tseregounis and Riley [1] for the similar system (R134a + tetraethylene glycol dimethyl ether).…”

“…The polyalkylene glycols (PAGs) have been proposed as suitable lubricants for R134a and several researchers have focused their attention on such mixtures, for which measurements of solubility [1][2][3][4][5], density [6][7][8][9], and viscosity [6,[10][11][12] have been obtained. A technical lubricant is usually a mixture of several components sharing a same chemical structure, e.g., PAGs, in which few of them are prevailing in composition; some additives are furthermore added to this mixture.…”

Viscosity measurements and correlations of binary mixtures: 1,1,1,2-tetrafluoroethane (HFC-134a)+tetraethylene glycol dimethylether (TEGDME)

“…Polyalkylene glycol dimethyl ethers (PGDME), CH 3 O-((CH 2 ) 2 O) n -CH 3 , have been proposed as suitable lubricants for HFC-134a [1]. However, in spite of their importance, there are only a few studies available in the literature on the thermophysical properties of the HFC-134a + PGDME system [2][3][4][5][6].…”

Temperature and Pressure Dependences of Thermophysical Properties of Some Ethylene Glycol Dimethyl Ethers from Ultrasonic Measurements

“…In recent years, several ethylene glycol dimethyl ethers have been investigated as absorbents of natural and alternative refrigerants for absorption and absorption-compression systems [5][6][7][8]. Tetraglyme is also proposed as a lubricant for compression refrigeration systems using hydrofluorocarbons (HFCs) [9]. In summary, glymes are very useful functional fluids.…”