Article | Proceedings of The American Modelica Conference 2018, October 9-10, Somberg Conference Center, Cambridge MA, USA | Fast Calculation of Refrigerant Properties in Vapor Compression Cycles Using Spline-Based Table Look-Up Method (SBTL) Linköping University Electronic Press Conference Proceedings
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Title:
Fast Calculation of Refrigerant Properties in Vapor Compression Cycles Using Spline-Based Table Look-Up Method (SBTL)
Author:
Lixiang Li: Modelon Inc, USA Jesse Gohl: Modelon Inc, USA John Batteh: Modelon Inc, USA Christopher Greiner: Ford Motor Company, USA Kai Wang: Ford Motor Company, USA
DOI:
10.3384/ecp1815477
Download:
Full text (pdf)
Year:
2018
Conference:
Proceedings of The American Modelica Conference 2018, October 9-10, Somberg Conference Center, Cambridge MA, USA
Issue:
154
Article no.:
008
Pages:
77-84
No. of pages:
8
Publication type:
Abstract and Fulltext
Published:
2019-02-26
ISBN:
978-91-7685-148-7
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press, Linköpings universitet


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Refrigerant property calculation has a significant impact on the computational performance of vapor compression cycle simulations. This paper summarizes a Modelica implementation of Spline-Based Table Look-Up Method (SBTL) for fast calculation of refrigerant properties. External C functions are used for faster spline evaluation and inversion. Significant improvement in computation speed was observed without sacrificing accuracy. An SBTL property model of R134a is first validated against a highly accurate Helmholtz energy equation of state (EOS) model. Then the new model was tested rigorously from single function calls, to heat exchanger test bench, to system models of the vapor compression cycle in Modelon’s Air Conditioning Library. Finally, an SBTL property model of R1234yf was used in a drive cycle simulation and a shutdown-startup test of two complex air conditioning system models developed at the Ford Motor Company. These system models are running more than twice the speed of the ones using Helmholtz energy EOS.

Keywords: Refrigerant Properties, Equation of State (EOS), Thermodynamic Modeling, Vapor Compression Cycle, Air Conditioning, Spline Interpolation, Computational Performance

Proceedings of The American Modelica Conference 2018, October 9-10, Somberg Conference Center, Cambridge MA, USA

Author:
Lixiang Li, Jesse Gohl, John Batteh, Christopher Greiner, Kai Wang
Title:
Fast Calculation of Refrigerant Properties in Vapor Compression Cycles Using Spline-Based Table Look-Up Method (SBTL)
DOI:
http://dx.doi.org/10.3384/ecp1815477
References:

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Proceedings of The American Modelica Conference 2018, October 9-10, Somberg Conference Center, Cambridge MA, USA

Author:
Lixiang Li, Jesse Gohl, John Batteh, Christopher Greiner, Kai Wang
Title:
Fast Calculation of Refrigerant Properties in Vapor Compression Cycles Using Spline-Based Table Look-Up Method (SBTL)
DOI:
https://doi.org10.3384/ecp1815477
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