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. 2023 May;30(24):65267-65282.
doi: 10.1007/s11356-023-26920-7. Epub 2023 Apr 20.

Estimation of thermodynamic properties of environmentally friendly new-generation R515B and R450A as an alternative to R134a

Erkan Dikmen  1 , Ragıp Yıldırım  2 , Arzu Şencan Şahin  1
Affiliations

Estimation of thermodynamic properties of environmentally friendly new-generation R515B and R450A as an alternative to R134a

Erkan Dikmen et al. Environ Sci Pollut Res Int. 2023 May.

Abstract

In the analysis of vapor compression refrigeration systems, simple and effective mathematical formulas are required to determine the thermodynamic properties of refrigerants. This study aims to determine the thermodynamic properties such as enthalpy, entropy, and specific volume of environmentally friendly new-generation refrigerants (R515B and R450A) with low global warming potential using gene expression programming (GEP). The thermodynamic properties calculated using the formulations obtained from the GEP model and the actual thermodynamic properties obtained from the REFROP software were compared. Performance evaluation criteria such as R2, root mean square error, and mean absolute percent error are in the range of 0.86 to 0.999, 0.0000285-6.489, and 0.0009-0.35, respectively, and these values are acceptable. This study offers simple and efficient formulations to calculate the thermodynamic properties of new-generation refrigerants without the need for any software. So, the simulation of cooling and heat pump systems will be greatly facilitated.

Keywords: Enthalpy; Entropy; GEP; HFC/HFO mixture; New-generation refrigerants; R450A; R515B; Specific volume.

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References

    1. Amar MN, Ghriga MA, Ouaer H et al (2020) Modeling viscosity of CO2 at high temperature and pressure conditions. J Nat Gas Sci Eng 77:103271. https://doi.org/10.1016/J.JNGSE.2020.103271 - DOI
    1. Das BS, Devi K, Khatua KK (2019) Prediction of discharge in converging and diverging compound channel by gene expression programming. ISH J Hydraul Eng 27:385–395. https://doi.org/10.1080/09715010.2018.1558116 - DOI
    1. Ferreira C (2001) Gene expression programming: a new adaptive algorithm for solving problems. Complex Syst 13:87–129. https://doi.org/10.48550/arxiv.cs/0102027 - DOI
    1. Ferreira C (2006) Gene expression programming: mathematical modeling by an artificial intelligence. Springer, Berlin - DOI
    1. Gao N, Wang X, Xuan Y, Chen G (2019) An artificial neural network for the residual isobaric heat capacity of liquid HFC and HFO refrigerants. Int J Refrig 98:381–387. https://doi.org/10.1016/J.IJREFRIG.2018.10.016 - DOI

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