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An hybrid formulation for fast explicit calculation of thermodynamic properties of pure refrigerants.

Number: pap. ID: 346

Author(s) : SIERES J., MARTíNEZ-SUÁREZ J. A.

Summary

When simulating refrigeration systems or equipments, knowledge of refrigerant thermodynamic properties is required. Frequently, during the simulation, these thermodynamic properties have to be determined a large number of times and sometimes their calculation is required within iteration loops. Even though the traditional equations of state have the ability to yield all of the thermodynamic properties, these formulations present the disadvantage of their low computational speed and that most of the thermodynamic properties equations are implicit and require iterations. In this paper a hybrid formulation for the calculation of thermodynamic properties of pure refrigerants is presented. Separate equations are used to model different regions and properties. Explicit individual formulations are used to model some properties which are used to predict other thermodynamic properties through differentiation. Explicit formulations can be obtained for all the thermodynamic properties of interest, which assures a fast and stable calculation. As an example the equations for R22 refrigerant are presented in the paper.

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Pages: 8 p.

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Details

  • Original title: An hybrid formulation for fast explicit calculation of thermodynamic properties of pure refrigerants.
  • Record ID : 30002548
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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