摘要
为获得不破坏臭氧层的环保工质的热物性数据 ,对HFC- 2 2 7ea的热力学性质进行了研究 ,精确测量了 2 43～375 K的饱和蒸气压 ,使用膨胀 -定容法测量了 2 78～ 377K,压力 0 .2 6～ 2 .6 MPa的 HFC- 2 2 7ea的气相 p VT性质 ,温度和压力测量的最大不确定度分别为± 10 m K和± 5 0 0 Pa。使用测量结果关联了 HFC- 2 2 7ea的蒸气压方程 ,导出了维里系数、饱和气相密度、饱和蒸发焓 ,并关联了截断维里型的状态方程用于再现 HFC- 2 2 7ea气相区的热力性质。
heptafluoropropane (HFC 227ea) is a recently introduced, commercially available hydrofluorocarbon (HFC), it can be used as an alternative to halon, and blends containing HFC 227ea are potential alternatives to HCFC 22 and R502. Effective use of HFC 227ea requires that the thermodynamic and transport properties are accurately measured, but there is few data available. The gaseous thermodynamic properties of HFC 227ea are presented in this paper. The vapor pressure of HFC 227ea was measured over the temperature range from 243 to 375 K. The pressure volume temperature (pVT) properties of HFC 227ea in the gaseous phase were measured using Burnett/isochoric methods over the temperature range from 283 to 377 K and pressure range from 0.26 to 2.5 MPa. The maximum uncertainties for temperature and pressure in this work were estimated to be within ±10mK and ±500Pa , respectively. The experimental data was used to develop a vapor pressure equation for HFC 227ea. The virial coefficients, the saturated vapor density and the enthalpy of vaporization for HFC 227ea were also determined.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2000年第10期73-76,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金项目!(5 990 6 0 0 6 )
关键词
七氯丙烷
维里系数
制冷剂
热力学性质
heptafluoropropane
vapor pressure
pVT properties
virial coefficients
saturated vapor density
enthalpy of vaporization
thermodynamic properties
