【作者】 安保林； 段远源； 谭龙山； 杨震；

【Author】 AN Baolin;DUAN Yuanyuan;TAN Longshan;YANG Zhen;Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Tsinghua University;

【机构】 清华大学热科学与动力工程教育部重点实验室二氧化碳资源化利用与减排技术北京市重点实验室；

【摘要】 液相pvT 是流体的重要热物理性质之一,定容法是一种可靠、精确的液相pvT 测试方法。本文分析了定容法液相pvT 的测量原理,并在此基础上研制了一套液相pvT 实验系统,主要包括实验段、温度测量系统、压力测量系统、密度测量系统及真空系统,对可能影响实验测量精度的因素进行了细致分析,探索了液相pvT 的实验流程。利用高纯度R134a标定了294.899 K、21.847 MPa下的实验段体积,研究了温度与压力对实验段体积的影响,在此基础上开展了温度270 K~295 K,压力1.7 MPa~21.8MPa下的R134a液相pvT 实验,测量结果与文献结果吻合很好,验证了实验系统的可靠性和精度。更多还原

【Abstract】 Liquid phase pvT behavior is an important thermodynamic property and can be measured precisely with a constant-volume cell.An apparatus was built to measure liquid PVT properties alone isochore,including the constant-volume cell,the temperature measurement system,the pressure measurement system,the density measurement system and the vacuum system.The volume of the constant-volume cell was calibrated with high purity R134 a at temperature of 294.899 K and pressure of 21.847 MPa.Then the effect of temperature and pressure on the cell volume was analyzed.The pvT behavior of R134 a in liquid phase was measured at temperature from 270 K to 295 K and pressure from 1.7 MPa to 21.8 MPa.The experimental results agree well with literature data.更多还原