Study on the PVT x Properties for Mixtures of Alternative Refrigerants

替代制冷剂混合物的PVT x 性能研究

基本信息

批准号：
08650890
负责人：
TAKAGI Toshiharu
金额：
$ 1.22万
依托单位：
Kyoto Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

The PVT properties in the liquid phase for binary mixtures of HFC32 +HFC125, +HFC134a, and HFC125 + HFC134a were measured at from 283K to 353K and from near the saturated pressure to about 20 MPa.The method used in this work was the new direct-weighing technique. The sample vessel (about 64cm<@D13@>D1) was suspended to an electric balance (1200(]SY.+-。[)0.001g), and the densities were observed by direct weighing the gross weight of vessel contained the sample. The pressure generated by a hand oil pump was transmitted to the sample through the capillary tube. The suspension mechanism including the sample vessel was immersed in a liquid thermostat controlled within (]SY.+-。[)0.02K.The temperature was measured by a quartz thermometer. The pressure was measured by two precision strain gauges of maximum pressure : 5(]SY.+-。[)0.003 MPa and 25(]SY.+-。[)0.008 MPa.The volume in the sample vessel was obtained from the specific volume of methanol measured at 298.15K and 0.1MPa. The densities of pure HFC32, HFC125, HFC134a and HFC152a (purity : better than 99.6%) having the different density were observed at several temperatures and pressures, and the reliability of densimeter were confirmed to be measure an uncertainty within (]SY.+-。[)0.002g/m<@D13@>D1 compared with reference values.The mixtures were prepared by weighing with an uncertainty of within (]SY.+-。[)0.0003 mole, and the densities of liquid binary mixtures of HFC32/HFC125, HFC32/HFC134a and HFC125/HFC134a were measured at several temperatures and pressures. The bubble point pressures for these systems required to estimate the saturated liquid density were also measured by the instrument for ultrasonic speed measurement. Among these mixtures, They for HFC32/HFC125 were measured in detail for narrow interval concentrations, because that system has an azeotropic mixture. These results were correlated by the Fuller's equation of state and the Peng-Robinson's equation of state with a reasonable accuracy.

HFC32 +HFC125， +HFC134A和HFC125 +HFC134A的二进制混合物的PVT特性以283K到353K至353K，从饱和压力到20 MPA。将样品容器（约64厘米<@D13@> D1）悬挂在电平衡（1200（]SY。+ - 。[）0.001G）中，并通过直接加权容器的总重量包含样品来观察这些密度。手油泵产生的压力通过毛细管传输到样品。将包括样品血管的悬浮机理浸入（]SY。+ - 。[）0.02K内的液体恒温器中。温度是通过石英温度计测量的。压力是通过两个最大压力的两个精度应变计测量的：5（]SY。+ - 。[）0.003 MPa和25（]SY。+ - 。[）0.008 MPa。样品血管中的体积是从在298.15K和0.1MPA下测得的特异性甲醇体积获得的。在几个温度和压力下观察到具有不同密度的纯HFC32，HFC125，HFC125，HFC134A和HFC152A（纯度：大于99.6％）的密度，并确认在（SY.SY。.0002G/M <@d1）中，确认了密度和密度的可靠性，并确认了一个值。通过（] SY。+ - 。[）0.0003摩尔的不确定性加权，以及在几个温度和压力下测量了HFC32/HFC125，HFC32/HFC134A和HFC125/HFC134A的HFC32/HFC125，HFC32/HFC134A和HFC125/HFC134A的密度。这些系统的气泡点压力还通过仪器进行超声速度测量来测量估算饱和液体密度所需的气泡点压力。在这些混合物中，对于HFC32/HFC125，它们的间隔浓度进行了详细测量，因为该系统具有共半聚体混合物。这些结果与国家方程式和彭 - 罗宾逊国家方程式相关，具有合理的精度。