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Citation: Nan Zhao-Dong, Tan Zhi-Cheng, Sun Li-Xian. Thermodynamic Investigation of the High Efficient Working Fluid Used for a Heat Pipe[J]. Acta Physico-Chimica Sinica, ;2003, 19(09): 883-885. doi: 10.3866/PKU.WHXB20030922 shu

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

1.
Chemical Department of Liaoning Normal University, Dalian　116029;

Received Date: 21 March 2003
Available Online: 15 September 2003

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.
- Heat pipe;Working fluid;Heat capacity;Adiabatic calorimetry; 　Thermodynamic function
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