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Refining equation of state models for refrigerant mixtures around the critical temperature of one component.

Number: 2189

Author(s) : GRUNDY D., SEETON C. J., LOW R. E.

Summary

Vapour-liquid-equilibrium (VLE) measurements are often carried out in a static cell of known volume. Typically known masses of pure components are charged to the measuring cell and pressure data generated over a range of temperatures, then the data are used to regress interaction parameters for a thermodynamic model. At low temperatures and pressures a simple model can be used to solve mass and volume balance equations as it can be assumed that most of the mass is in the liquid with negligible amounts in the vapour. However, as the critical temperature of one or more of the refrigerant components is approached or exceeded then the vapour pressure and density typically increases such that the vapour inventory of the system becomes appreciable. Therefore, it may be difficult to accurately infer the phase compositions from measured pressure alone, as the calculation becomes sensitive to the modelled liquid and vapour densities. A modified PTx cell will be used to enable sampling of the vapour space by gas chromatography (GC) along with a Coriolis meter to measure liquid and vapour density. A PVT cell will be used to generate data at or near to the critical point. These additional parameters will be used to assess potential improvement to regression of EoS parameters around the critical region.

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  • Original title: Refining equation of state models for refrigerant mixtures around the critical temperature of one component.
  • Record ID : 30033071
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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