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Fast, stable computation of thermodynamic properties of ammonia-water mixtures.

Author(s) : RATTNER A. S., GARIMELLA S.

Type of article: Article, IJR article

Summary

Software implementations of thermodynamic property routines for ammonia-water mixtures are developed for refrigeration and air-conditioning applications. Saturation correlations are employed to identify single-phase state points, yielding up to a 5-fold reduction in property evaluation time. A run-time database of previously evaluated state points is implemented to improve initial guesses for iterative property evaluation, reducing property evaluation time by 45% in a representative study. The property routines are implemented in a standalone program and as a compiled routine for use in MATLAB® and Simulink®. Both implementations perform property evaluations significantly faster than existing software packages. Program performance is measured on a 2.2?GHz machine, and average individual state point evaluation times were found to range from 50 to 930?µs, depending on the provided input properties. Additionally, a segmented, transient, ammonia-water absorber model is developed in Simulink® to assess the use of the property routines for practical engineering calculations. The proposed computational techniques can be applied to accelerate property evaluations for other mixtures.

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Pages: 39-59

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Details

  • Original title: Fast, stable computation of thermodynamic properties of ammonia-water mixtures.
  • Record ID : 30016710
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 62
  • Publication date: 2016/02

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