物理化学学报 >> 2003, Vol. 19 >> Issue (09): 883-885.doi: 10.3866/PKU.WHXB20030922

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高效热管传热工质的热力学研究

南照东;谭志诚;孙立贤   

  1. 辽宁师范大学化学系，大连　116029； 2中国科学院大连化学物理研究所热化学实验室，大连　116023
  • 收稿日期:2003-03-21 修回日期:2003-05-06 发布日期:2003-09-15
  • 通讯作者: 南照东 E-mail:zdnan65@hotmail.com

Thermodynamic Investigation of the High Efficient Working Fluid Used for a Heat Pipe

Nan Zhao-Dong;Tan Zhi-Cheng;Sun Li-Xian   

  1. Chemical Department of Liaoning Normal University, Dalian　116029;
  • Received:2003-03-21 Revised:2003-05-06 Published:2003-09-15
  • Contact: Nan Zhao-Dong E-mail:zdnan65@hotmail.com

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摘要： 用精密绝热量热法测量了高效热管传热工质在78～320 K温区内的热容.结果表明，在78.41～245.19 K， Cp/(J•K－1•g－1)=0.5369T＋0.07279.在274.08～318.51 K， Cp/(J•K－1•g－1)=3.403±0.020.在245～274 K， 高效热管传热工质发生固液相变.其相变温度、相变焓和相变熵分别是271.21 K、353.6 J•g－1，和1.304 J•K－1•g－1.根据热容与温度的定量关系和热力学函数之间的关系，得到了以标准温度298.15 K为基准的高效热管传热工质的热力学函数.

关键词: 热管, 工质, 热容, 绝热量热, 热力学函数

Abstract: The heat capacities of the high efficient working fluid used for a heat pipe(Cp) were measured by a low temperature adiabatic calorimeter over the range from 78 to 320 K. No thermal anomaly was observed in the range from 78 to 245 K and 274 to 320 K. The functions of Cp vs T were established based on the measured heat capacity data by least-square fitting method to be Cp/(J•K－1•g－1)=0.5369T＋0.07279 in the range of 78.41～245.19 K. The freezing point, freezing enthalpy and freezing entropy of it were determined to be 271.21 K, 353.6 J•g－1 and 1.304 J•K－1•g－1, respectively. The heat capacities of it are near a constant to be Cp/(J•K－1•g－1)=3.403±0.020 in the range 274 K≤T≤320 K. According to the relationship of thermodynamic functions, the thermodynamic function values of the working fluid were calculated in the temperature range of 280～320 K with 5 K intervals.

Key words: Heat pipe, Working fluid, Heat capacity, Adiabatic calorimetry, 　Thermodynamic function