Abstract
The increasing concerns of global warming impact of traditional HFC refrigerants drives the requirement for alternatives more urgent. Due to the excellent properties (zero ODP, extremely-low GWP, nonflammable, nontoxic, etc.), 3,3,3-Trifluoropropene (R-1243zf) is attracting a lot of fashionable attention in the refrigeration and air conditioning (RAC) industry. To better understand the oil existence influence on the performance of an evaporator, the vapor–liquid-phase equilibrium were measured for R-1243zf with PAG 68, PEC4, and POE 85 oils by an isochoric method between (298.15 and 343.15) K. The NRTL model was applied to correlate the phase-equilibrium data. The pressure-enthalpy-vapor quality (p-h-X) diagrams were plotted for R-1243zf and R-1243zf/lubricant blends with different oil-circulation mass fractions (Cg), and the differences in enthalpies were analyzed. There is a critical vapor quality (Xcri) between the isotherm curves. On the left side of Xcri, isotherm curves are almost identical. On the right side of Xcri, these curves separated gradually especially at high vapor quality.
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