摘要
本文介绍了一套自行研制的制冷工质PVT实验系统。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。实验结果表明,在整个适用温度范围内温度测量精度可达±5mK。压力测量系统最大不确定度为±1.5 kPa。利用本装置,测量了HFC-227ea的蒸气压,并拟合了一个Wagner型蒸气压方程,结果与文献值吻合很好。
A PVT measurement system of refrigerants is developed. It's controlled by a computer automatically. The overall pressure and temperature uncertainty is about ±1.5 kPa, and ±5 mK, respectively. The vapor pressures of HFC-227ea were measured in the temperature range from 233.15 to 375.15K, and a Wagner-type vapor pressure equation for HFC-227ea was developed.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2003年第1期19-21,共3页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.59976040)
