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Extension of the applicable range of the implicit curve-fitting method for refrigerant thermodynamic properties to critical pressure.
Author(s) : DING G. L., WU Z., WANG K., et al.
Type of article: Article, IJR article
Summary
The method of implicit curve fitting and explicit-calculation has been used for fast and stable calculations of thermodynamic properties of subcritical refrigerants. In order to extend that method to the critical pressure, a method of sectional implicit curve fitting and explicit-calculation for refrigerant thermodynamic properties is introduced in this paper. The whole data range is divided into several subsections. The requirements on the continuity of thermodynamic properties and the first order derivative of thermodynamic properties in the intersection points of subsections are indicated, and the methods to meet the requirements are presented. Quadric equations are constructed instead of curve fitting when no data can be given. With the source data obtained from REFPROP 7.1, explicit fast calculation formulae for thermodynamic properties of R-410A, covering the saturated temperature of 213.15-344.51 K and superheat of 0-65 K, are given as an example. The calculation speeds of the formulae of R-410A are more than 7000 times faster than those of REFPROP 7.1 while the total mean relative deviation of the fast calculation formulae from REFPROP 7.1 is only 0.04%.
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Pages: 418-432
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Details
- Original title: Extension of the applicable range of the implicit curve-fitting method for refrigerant thermodynamic properties to critical pressure.
- Record ID : 2007-0518
- Languages: English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 30 - n. 3
- Publication date: 2007/05
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Indexing
- Themes: Blends
- Keywords: R410A; Critical pressure; Calculation; Thermodynamic property; Refrigerant
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Extension of the implicit curve-fitting method ...
- Author(s) : DING G., HAN W., ZHAO D., et al.
- Date : 2009/09
- Languages : English
- Source: HVAC&R Research - vol. 15 - n. 5
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Extension of the implicit curve-fitting method ...
- Author(s) : ZHAO D., DING G., WU Z.
- Date : 2009/11
- Languages : English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 32 - n. 7
- Formats : PDF
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R410A: Thermophysical Properties.
- Author(s) : IIF-IIR
- Date : 2001
- Languages : English
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Thermodynamic properties of 1,1,1,2-tetrafluoro...
- Author(s) : AKASAKA R., HIGASHI Y., YAMADA Y., et al.
- Date : 2015/10
- Languages : English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 58
- Formats : PDF
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R410A: fact and fiction.
- Author(s) : SPATZ M., METCALF D.
- Date : 2003/02/03
- Languages : English
- Source: Air Cond. Heat. Refrig. News/achrnews.com - 5 p.
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