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A novel modelling approach for thermodynamic data of refrigerant-oil mixtures.

Number: 0620

Author(s) : FEJA S., HANZELMANN C., SCHMIDER E.

Summary

Modelling all necessary thermodynamic properties, especially density, phase behavior, specific heat capacity, entropy, enthalpy, viscosity and thermal conductivity of lubricating oils and, in addition, the vapor pressure of refrigerant-oil mixtures in chillers and heat pumps, is still a challenge today. Here we propose a new modelling approach based on the material data of the pure oil from the manufacturer's data sheet. For the temperature dependence of thermodynamic data of the pure oil, the model achieves an accuracy in the range of the measurement uncertainty. For the mixtures, the model could be extended using tabulated data of the refrigerant. With already described mathematical relationships and new approaches to the temperature-concentration behavior of the relevant thermodynamic properties of refrigerant-oil mixtures, it is possible to predict these properties. For an example system (R290-PAG oil), the derivation of the coefficients of the equation representing the temperature- concentration behavior of the density of the refrigerant-oil system is presented. This estimation is initially made without the use of additional measurement data from the mixture. A similar approach is presented for the thermal properties of pure oils and of this mixture. The vapor pressure-viscosity behavior as a function of temperature and concentration (pvT) of a R290-PAG oil mixture can also be derived in this way and is shown in excerpts.

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Pages: 8 p.

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Details

  • Original title: A novel modelling approach for thermodynamic data of refrigerant-oil mixtures.
  • Record ID : 30033370
  • Languages: English
  • Subject: Technology
  • Source: 11th IIR Conference on Compressors and Refrigerants.
  • Publication date: 2024/09
  • DOI: http://dx.doi.org/10.18462/iir.compr.2024.0620

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