TR2021-053

Patch-based Thermodynamic Property Models for the Subcritical Region


    •  Laughman, C.R., Qiao, H., "Patch-based Thermodynamic Property Models for the Subcritical Region", Purdue Air-Conditioning and Refrigeration Conference, May 2021.
      BibTeX TR2021-053 PDF
      • @inproceedings{Laughman2021may,
      • author = {Laughman, Christopher R. and Qiao, Hongtao},
      • title = {Patch-based Thermodynamic Property Models for the Subcritical Region},
      • booktitle = {Purdue Air-Conditioning and Refrigeration Conference},
      • year = 2021,
      • month = may,
      • url = {https://www.merl.com/publications/TR2021-053}
      • }
  • MERL Contacts:
  • Research Area:

    Multi-Physical Modeling

Abstract:

Model-based design approaches for vapor-compression cycles depend heavily upon refrigerant property representations that are fast, accurate, and consistent. We describe an approach based upon B-spline interpolants that describes properties such as density, temperature, and specific entropy as the intersection of multiple surfaces, which are referred to as "patches." When combined with a transformation of thermodynamic coordinates, this approach can calculate the density over a domain with a maximum absolute percentage error less than 3x10-5 and a speedup over REFPROP of greater than 100x.