Abstract 2,3,3,3-tetrafluoropropene (HFO1234yf) has been regarded as a promising alternative refrigerant and gained increasing interesting due to its environmental friendly properties. The introduction of HFO1234yf requires knowledge of the accurate thermophysical properties. The accurate speed of sound data is important for the improvement of the dedicated equations of state and the application in energy-conversion system. The speed of sound in gaseous phase for HFO1234yf was measured by means of the acoustic resonance method using a fixed-path cylindrical resonator. Measurements were conducted in the temperature range from 308 K to 370 K with pressures up to 1 MPa. The speed of sound was obtained from the accurate measurements of acoustic resonant frequencies after being corrected for the perturbations from the viscous and thermal boundary layers, the gas filling duct, acoustic transducers and the shell motions. A total of 116 speed of sound data points were obtained with an expanded uncertainty less than 1.4 × 10−4 at the confident level of 0.95. The measured speed of sound shows good consistent with the literature data and the calculation of equation of state. The ideal gas heat capacities at constant pressure for HFO1234yf were deduced by fitting the measured speed of sound data along 13 isotherms. The determined ideal gas heat capacities at constant pressure are mainly consistent with the calculations of equation of state and the predictions of quantum mechanical calculations. A temperature dependent polynomial approximation of the ideal gas heat capacity at constant pressure for HFO1234yf was developed.

中文翻译：

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HFO1234yf 气态声速从 308 K 到 370 K，压力高达 1 MPa

摘要 2,3,3,3-四氟丙烯（HFO1234yf）被认为是一种很有前途的替代制冷剂，并且由于其环保特性而越来越受到关注。引入 HFO1234yf 需要了解准确的热物理特性。声速数据的准确速度对于专用状态方程的改进和在能量转换系统中的应用具有重要意义。HFO1234yf 的气相声速是通过使用固定路径圆柱形谐振器的声学谐振方法测量的。测量在 308 K 至 370 K 的温度范围内进行，压力高达 1 MPa。声速是通过对来自粘性和热边界层、气体填充管道、声换能器和壳运动的扰动进行校正后的声共振频率的精确测量获得的。在 0.95 的置信水平下，总共获得了 116 个声速数据点，扩展不确定性小于 1.4 × 10−4。测得的声速与文献资料和状态方程计算结果吻合良好。HFO1234yf 在恒压下的理想气体热容是通过沿 13 条等温线拟合测得的声速数据推导出来的。确定的恒压理想气体热容主要与状态方程的计算和量子力学计算的预测一致。