Marcia L. Huber, Andrei F. Kazakov, Eric W. Lemmon
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引用次数: 0
Abstract
We present an empirical equation of state in terms of the Helmholtz energy for trans-1,2-dichloroethene [R-1130(E)]. The range of validity is from the triple-point temperature, 223.31 K to 525 K with pressures up to 30 MPa. It may be used to calculate all thermodynamic properties in the fluid phase, including liquid, gas, and supercritical regions. Comparisons are given with existing literature data and estimated uncertainties are provided. In addition, checks were made for correct extrapolation behavior so that the equation behaves in a physically realistic manner when used outside of its range of validity, enabling its use in mixture models. The estimated uncertainties (at a k = 2 or 95 % level of confidence) are based on comparisons with critically assessed data and are 0.25 % for vapor pressure for temperatures in the range 300 K < T < 454 K, rising to 1.5 % as the temperature decreases from 300 K to 265 K. For density in the liquid phase the estimated uncertainty is 0.14 % for temperatures 270 K < T < 410 K and for pressures up to 30 MPa. For the vapor phase the estimated uncertainty in density is 3 %. The uncertainty for liquid-phase heat capacity is 1 % at atmospheric pressure over the temperature range 268 K < T < 309 K, and the uncertainty for the speed of sound in the liquid phase is 0.25 % for temperatures 230 K < T < 420 K and for pressures up to 30 MPa. The uncertainties are larger outside of these specified ranges and in the critical region.
我们提出了反式-1,2-二氯乙烯[R-1130(E)]的亥姆霍兹能量的经验状态方程。有效范围从三点温度,223.31 K至525 K,压力高达30 MPa。它可用于计算流体相的所有热力学性质,包括液体、气体和超临界区域。与现有文献数据进行了比较,并提供了估计的不确定性。此外,还对正确的外推行为进行了检查,以便该方程在超出其有效范围时以物理真实的方式运行,从而使其能够在混合模型中使用。估计的不确定性(在k = 2或95%置信水平下)是基于与严格评估的数据的比较,并且在300 k <; T <; 454 k范围内的蒸汽压为0.25%,当温度从300 k降至265 k时上升到1.5%。对于液相密度,在温度270k和压力30mpa时,估计不确定度为0.14%。对于气相,密度的估计不确定度为3%。在268 K <; T <; 309 K的大气压范围内,液相热容的不确定度为1%,在230 K <; T <; 420 K的温度范围内,液相声速的不确定度为0.25%,压力高达30 MPa。在这些规定范围之外和临界区域,不确定度较大。
期刊介绍:
International Journal of Thermophysics serves as an international medium for the publication of papers in thermophysics, assisting both generators and users of thermophysical properties data. This distinguished journal publishes both experimental and theoretical papers on thermophysical properties of matter in the liquid, gaseous, and solid states (including soft matter, biofluids, and nano- and bio-materials), on instrumentation and techniques leading to their measurement, and on computer studies of model and related systems. Studies in all ranges of temperature, pressure, wavelength, and other relevant variables are included.