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,C_p/(J·K^(-1)·g^(-1))=0.5369T+0.07279.在274.08～311.51 K,C_P/(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.
The heat capacities of the high efficient working fluid used for a heat pipe( C-p) 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 C-p vs T were established based on the measured heat capacity data by least-square fitting method to be C-p/(J . K-1 . g(-1)) = 0. 5369 T + 0. 07279 in the range of 78. 41 similar to 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 C-p/ (J . K-1 . g(-1)) = 3. 403 +/- 0. 020 in the range 274 K less than or equal to T less than or equal to 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 similar to 320 K with 5 K intervals.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2003年第9期883-885,共3页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(20073047)
王宽诚博士后工作奖励基金~~
关键词
传热
工质
热容
绝热量热
热力学函数
相变温度
热管
heat pipe
working fluid
heat capacity
adiabatic calorimetry
thermodynamic function
