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Development of equations of state for low global warming potential refrigerants based on supercritical flow calorimetry measurements.

Number: 0517

Author(s) : NIEUWENHUYSE J. van, FAES W., SALLET C., PAEPE M. de, LECOMPTE S.

Summary

Equations of State (EOS) are semi-empirical models used to calculate the physical and transport properties of fluids. In order to have reliable EOS, accurate experimental data are required. However, in the near-critical region only limited data are available. Therefore, an experimental setup was built in previous years in order to extend the experimental database of isobaric specific heat capacities of newer refrigerants with a low Global Warming Potential (GWP), specifically in the near-critical region. Firstly, the principle behind measuring isobaric specific heat capacities through flow calorimetry measurements is explained. Next, the design procedure of the test rig and the performed experimental campaign is highlighted. Finally, the calibration and validation of this setup are discussed using R245fa as calibration fluid. Measurements at both subcritical and supercritical pressures have been performed for this purpose. Determination of the heat losses in the test section and measurement accuracy improvement are the main focus. The heat losses to the surroundings can be estimated based on a third degree polynomial and the test rig has been successfully validated up to temperatures of 410 K. Future work includes extending the capacity of the setup to higher temperatures and performing an experimental campaign on newer refrigerants with a low GWP in the near-critical region. These experimental data can subsequently be used to construct reliable EOS.

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Pages: 12 p.

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Details

  • Original title: Development of equations of state for low global warming potential refrigerants based on supercritical flow calorimetry measurements.
  • Record ID : 30031628
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0517

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