Development of new high accuracy PVTx measurement experiment system

With the new temperature measurement, pressure measurement and data acquisition technology, a new experimental system of PVTx measurement is investigated and developed. The analysis results indicate that temperature uncertainty of the new PVTx measurement is below 2 mK, and the pressure uncertainty is below 0.8 kPa. The vapor pressure of HFC152a between 294-353 K is measured with the new experimental system, and the experimental results indicate that the average deviation between the experimental data and the equation provided in the literature is below 0.011%, and the standard deviation is below 0.037%. The new experimental system is reliable.