Abstract
The design of processes using cryogenic fluid mixtures requires fluid property data, which is unavailable today. In particular, this data is crucial to develop cryogenic mixed-refrigerant cycles for high-temperature superconductor (HTS) applications and to further optimize hydrogen liquefaction processes. CryoPHAEQTS, which is currently being built at KIT, will provide physical property data for fluid mixtures in a temperature range of 15–300K and at pressures up to 15 MPa, including also mixtures with either flammable or oxidizing components (e.g. hydrogen, deuterium, oxygen). By direct sampling from an equilibrium cell, vapor-liquid equilibria (VLE) and vapor-liquid-liquid equilibria (VLLE) can be determined using gas chromatography. Solid-liquid equilibria (SLE) are measured using a calorimetric method. The measurement of heat capacities is implemented by combining two different flow measurement principles. In addition, the test stand offers optical access for a future upgrade with an optical measurement system that allows in-equilibrium measurements of both bulk transport properties by dynamic light scattering (DLS) and surface tension by surface light scattering (SLS).
Highlights
HTS cooling with liquid N2 limited by triple point at 63 K Cryogenic mixed refrigerants reach lower temperatures more efficiently than pure substances Physical property data unavailable today
*For SLE, only the liquidus line can be obtained from liquid phase analysis
KIT – The Research University in the Helmholtz Association
Summary
HTS cooling with liquid N2 limited by triple point at 63 K Cryogenic mixed refrigerants reach lower temperatures more efficiently than pure substances Physical property data unavailable today Phase equilibria measurements of cryogenic fluid mixtures Up to 15 MPa Cryogenic mixtures, incl.
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