Acta Phys. -Chim. Sin. ›› 2003, Vol. 19 ›› Issue (09): 883-885.doi: 10.3866/PKU.WHXB20030922

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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

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