Development of apparatuses for PVT properties of hydrogen and measurements at high temperatures and high pressures


N. Sakoda1, K. Motomura2, . Supriatno2, Y. Fukatani2, K. Shinzato3, M. Kohno2, Y. Takata2 and M. Fujii3

1International Research Center for Hydrogen Energy, Kyushu University, Japan
2Department of Mechanical Engineering, Kyushu University, Japan
3HYDROGENIUS, National Institute of Advanced Industrial Science and Technology (AIST), Japan

Keywords: high temperature, high pressure
property: PVT property
material: hydrogen

Hydrogen energy is expected to be a next generation clean energy carrier. Accurate thermodynamic properties over wide temperature and pressure range are essential for efficient design of products using hydrogen technology such as fuel cell vehicles and hydrogen refueling stations. However, the currently available thermodynamic property data of hydrogen are not sufficient at high temperatures and high pressures. PVT property forms the most basic set of thermodynamic properties and is required for developing an equation of state (EOS). In the present work, an apparatus using the Burnett method was developed and the PVT property of hydrogen in the temperature range from 353 K to 473 K and at pressures up to 100 MPa was measured. Based on the data, a virial EOS was developed from 220 K to 473 K and up to 100 MPa with compiling some reliable data at low temperatures. The virial EOS represent primary data within 0.1 %. To obtain data of even higher accuracy, a single-sinker type magnetic suspension densimeter up to 523 K and 100 MPa was introduced and preliminary measurements have been performed. In addition, to expand the measurement temperature range, an apparatus using the isochoric method for conditions up to 773 K and 1 MPa was developed. In this high temperature region, the PVT property of hydrogen was measured. For hydrogen, it is difficult to determine the initial density and it is evaluated by expanding the sample in the vessel at high temperature to the other vessel at moderate temperature, where the PVT property is well known. Finally, the isochoric method apparatus at high temperatures and high pressures up to 773 K and 100 MPa has been developed.


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