Fortin Tara J, McLinden Mark O
National Institute of Standards and Technology, Material Measurement Laboratory, Applied Chemicals and Materials Division, 325 Broadway, Boulder, CO 80305-3328, U.S.A.
J Chem Eng Data. 2023 Jul 13;68(7):1565-1583. doi: 10.1021/acs.jced.3c00104. Epub 2023 Jun 14.
The pressure-density-temperature-composition ( ) data of binary refrigerant mixtures containing R-32 (difluoromethane), R-152a (1,1-difluoroethane), R-227ea (1,1,1,2,3,3,3-heptafluoropropane), R-1234yf (2,3,3,3-tetrafluoropropene), and R-1234ze(E) (-1,3,3,3-tetrafluoropropene) were measured in both the vapor and liquid phases using a two-sinker, magnetic-suspension densimeter. The specific samples in this study comprised two compositions of approximately (0.3/0.7) and (0.7/0.3) mole fraction for each of the following four binary refrigerant blends: R-32 + R-1234yf, R-32 + R-1234ze(E), R-1234yf + R-152a, and R-1234ze(E) + R-227ea. Single-phase vapor densities were measured over a temperature range of approximately (253 to 293) K and pressures from (0.05 to 0.98) MPa. Single-phase liquid and supercritical densities were measured over a temperature range of approximately (230 to 400) K and pressures up to 22 MPa; for refrigerant blends containing R-1234yf the maximum pressure was limited to 14 MPa. Overall relative combined, expanded ( = 2) uncertainties in density ranged from 0.025% to 0.191%, with an average uncertainty of approximately 0.05%. Here, we present measurement results, along with comparisons to available literature data and to default equations of state and mixture models included in REFPROP.
使用双沉锤磁悬浮密度计测量了含有R-32（二氟甲烷）、R-152a（1,1-二氟乙烷）、R-227ea（1,1,1,2,3,3,3-七氟丙烷）、R-1234yf（2,3,3,3-四氟丙烯）和R-1234ze(E)（-1,3,3,3-四氟丙烯）的二元制冷剂混合物的压力-密度-温度-组成（p-ρ-T-x）数据。本研究中的特定样品包括以下四种二元制冷剂混合物，每种混合物的两种组成的摩尔分数约为(0.3/0.7)和(0.7/0.3)：R-32 + R-1234yf、R-32 + R-1234ze(E)、R-1234yf + R-152a和R-1234ze(E) + R-227ea。在大约(253至293)K的温度范围和(0.05至0.98)MPa的压力下测量了单相蒸汽密度。在大约(230至400)K的温度范围和高达22MPa的压力下测量了单相液体和超临界密度；对于含有R-1234yf的制冷剂混合物，最大压力限制为14MPa。密度的总体相对合成扩展不确定度（k = 2）范围为0.025%至0.191%，平均不确定度约为0.05%。在此，我们给出测量结果，并与现有文献数据以及REFPROP中包含的默认状态方程和混合物模型进行比较。
