冷媒評価のための流体物性計測技術の高度化に関する調査研究

Abstract

Measurement technology of fluid properties is required in a variety of industrial fields. This is especially important for the development of new refrigerants with low global warming potential, because their thermophysical properties are essential for the optimization of practical refrigeration cycles. This report reviews measurement technologies of thermophysical properties featuring pressure-volume-temperature (PVT) properties and viscosity of refrigerants. The PVT properties can be accurately measured by using a magnetic suspension densimeter. On the other hand, the viscosity in the gas phase is difficult to accurately measure in principle by the conventional techniques. The viscosity measurement using an acoustic resonance technique, however, is possible to realize an accurate gas viscosity measurement by improving some technical issues pointed in this report.