Abstract Thermal conductivity measurements of eight binary refrigerant mixtures were conducted in the homogeneous liquid and vapour phases with the transient hot-wire technique. The temperature range of the measurements spanned from (224.3 to 386.6) K with pressures ranging between (1.0 and 6.5) MPa. The binary mixtures were equimolar (R125 + R32), (R32 + R134a), (R32 + CO2), (R125 + R134a), (R125 + CO2), (R134a + R1234yf), (R134a + CO2) and (R1234yf + CO2). Additionally, two multi-component mixtures, (R32 + R1234yf + CO2) and (R32 + R1234yf + R134a + R125 + CO2), were investigated. The transient hot-wire apparatus was validated with measurements of pure CO2 in the liquid and vapour regions. The relative combined expanded uncertainty (k = 2) in the experimental thermal conductivity was on the order of 2.0%. The relative deviations of the measured thermal conductivities in the vapour phase from those calculated using the extended corresponding states (ECS) model with default binary interaction parameters (BIPs), as implemented in the software REFPROP 10, were between (−12 and +8) %, while those in the liquid phase were between (−15 and +4) %. The new experimental data were used to tune the BIPs in the ECS model. Significant improvements were observed especially in the liquid phase of the five-component mixture, with the root-mean-square of the relative difference between the experimental data and the model estimation reduced by a factor of nearly three.

中文翻译：

---

含氢氟烃（HFC-32、HFC-125、HFC-134a）、氢氟烯烃（HFO-1234yf）和二氧化碳（CO2）的制冷剂混合物的热导率测量

摘要 使用瞬态热线技术在均相液相和气相中对八种二元制冷剂混合物进行了热导率测量。测量的温度范围为 (224.3 至 386.6) K，压力范围为 (1.0 至 6.5) MPa。二元混合物为等摩尔 (R125 + R32)、(R32 + R134a)、(R32 + CO2)、(R125 + R134a)、(R125 + CO2)、(R134a + R1234yf)、(R134a + CO2) 和 (R1234y)二氧化碳）。此外，还研究了两种多组分混合物 (R32 + R1234yf + CO2) 和 (R32 + R1234yf + R134a + R125 + CO2)。瞬态热线装置通过测量液体和蒸汽区域中的纯 CO2 进行了验证。实验热导率的相对组合扩展不确定度 (k = 2) 约为 2.0%。如软件 REFPROP 10 中实施的那样，气相中测得的热导率与使用扩展对应状态 (ECS) 模型和默认二元相互作用参数 (BIP) 计算的热导率的相对偏差介于 (-12 和 +8) 之间%，而液相中的那些介于 (-15 和 +4) % 之间。新的实验数据用于调整 ECS 模型中的 BIP。特别是在五组分混合物的液相中观察到显着改善，实验数据和模型估计之间的相对差异的均方根减少了近三倍。如在软件 REFPROP 10 中实施的，在 (-12 和 +8) % 之间，而液相中的那些在 (-15 和 +4) % 之间。新的实验数据用于调整 ECS 模型中的 BIP。特别是在五组分混合物的液相中观察到显着改善，实验数据和模型估计之间的相对差异的均方根减少了近三倍。如在软件 REFPROP 10 中实施的，在 (-12 和 +8) % 之间，而液相中的那些在 (-15 和 +4) % 之间。新的实验数据用于调整 ECS 模型中的 BIP。特别是在五组分混合物的液相中观察到显着改善，实验数据和模型估计之间的相对差异的均方根减少了近三倍。