制冷工质PVT实验用精密低温恒温槽的研制  

The Development of Precise Low-temperature Thermostat for PVT Measurement of Refrigerants

作　　者：胡芃[1] 陈则韶[1] 罗大为[1] 程文龙[1] 

机构地区：[1]中国科学技术大学热科学和能源工程系,合肥230027

出　　处：《仪器仪表学报》2002年第4期414-416,426,共4页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金资助项目 (599760 4 0 )

摘　　要：介绍了一套自行研制的制冷工质PVT实验用精密低温恒温槽。该系统的温度控制采用改进的增量式数字PID算法 ,由自行开发的测控软件进行计算机实时测控 ,使温度能准确到达设定温度 ,并长时间保持稳定。实验结果表明 ,在 2 3 3K～室温温度范围内的控温精度可达± 5mK ,在室温～ 3 48K温度范围内控温精度可达± 3mK。整个系统自动化程度高 ,控温精确稳定 ,简单易用。In this paper,a precise low temperature thermostat is developed for PVT measurement of refrigerants.This system is controlled by computer,the software is programmed on the basis of modified incremental digital PID algorithm.The system temperature can arrive set temperature precisely and keep stable.According to the result of experiments,the fluctuation of temperature can be controlled less than ±5mK over the temperature range from 233K to room temperature,and ±3mK over the temperature range from room temperature to 348K,respectively.It has the advantage of robotization,high stability and credibility.

关 键 词：制冷工质 PVT实验 精密低温恒温槽 研制 温度控制 数字PID控制 

分 类 号：TB663[一般工业技术—制冷工程]