Horizontal convective boiling of R448A, R449A, and R452B within a micro-fin tube

Kedzierski, Mark A.; Kang, Dong Gyu

doi:10.1080/23744731.2016.1186460

Cited by 33 publications

(7 citation statements)

References 21 publications

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“…Kedzierski and Kang (2016) provide a correction factor for Eq. (4) to predict the flow boiling Nusselt Number (Nu) for mixtures of any number of refrigerants.…”

Section: Resultsmentioning

confidence: 99%

Horizontal convective boiling of R1234yf, R134a, and R450A within a micro-fin tube

Kedzierski

Kang

2018

International Journal of Refrigeration

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This paper presents local convective boiling heat transfer and Fanning friction factor measurements in a micro-fin tube for R134a and two possible low global warming potential (GWP) refrigerant replacements for R134a, namely R1234yf and R450A. Test section heating was achieved with water in either counterflow or in parallel flow with the test refrigerant to provide for a range of heat fluxes for each thermodynamic quality. An existing correlation from the literature for single and multi-component mixtures was shown to not satisfactorily predict the convective boiling measurements for flow qualities greater than 40%. Accordingly, a new correlation was developed specifically for the test fluids of this study so that a fair comparison of the heat transfer performance of the low GWP refrigerants to that of R134a could be made. The new correlation was used to compare the heat transfer coefficient of the three test fluids at the same heat flux, saturated refrigerant temperature, and refrigerant mass flux. The resulting example comparison, for the same operating conditions, showed that the heat transfer coefficient of the multi-component R450A and the single-component R1234yf were, on average, 15% less and 5% less, respectively, than that of the single-component R134a. Friction factor measurements were also compared to predictions from an existing correlation. A new correlation for the friction factor was developed to provide a more accurate prediction. The measurements and the new models are important for the evaluation of potential low-GWP refrigerants replacements for R134a.

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“…Kedzierski and Kang (2016) provide a correction factor for Eq. (4) to predict the flow boiling Nusselt Number (Nu) for mixtures of any number of refrigerants.…”

Section: Resultsmentioning

confidence: 99%

Horizontal convective boiling of R1234yf, R134a, and R450A within a micro-fin tube

Kedzierski

Kang

2018

International Journal of Refrigeration

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“…Convective boiling tests were performed on R-448A, R-449A, and R-452B in a microfin tube by Kedzierski and Kang [50], who found that R-452B had a 59% greater HTC than R-448A/R-449A. Matsuse et al [51] conducted an investigation into the flow boiling properties of R-32 inside a horizontal copper circular tube with an inner diameter of 1.0 mm.…”

Section: Boiling Inside the Plain/smooth Tubementioning

confidence: 99%

A Comprehensive Review on the Nucleate/Convective Boiling of Low-GWP Refrigerants: Alternatives to HFC Refrigerants

2023

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This review presents the nucleate/convective boiling performance for a variety of important low global warming potential (LGWP) alternatives to commonly used high-global warming potential (GWP) refrigerants (such as R-134a, R404A, and R-410A, etc.). Efforts are stressed on the assessment of their evaporation pressure drop and heat transfer coefficient (HTC) characteristics. These alternatives include R-1234ze(Z), R-1234ze(E), R-1233zd (E), R-1234ze(E), R-410A, R-1234yf, and R-513A. The authors investigated the thermo-fluid properties within and outside a tube, mini-channel, micro-fin tube, and plate heat exchanger. The investigation of the numerical, experimental, and simulated results revealed that the evaporation pressure drop and HTC characteristics were dependent on a variety of variables. These factors include the working fluid’s thermodynamics and transport properties, the refrigerant’s mass flux, heat flux, saturation temperature, the vapor quality, the conditions and flow patterns, the orientation of the heating surface, and the geometry (shape, size, and surface area smooth/enhanced) of the heating surface. An expanded LGWP refrigerants, surfaces, and conditions database is needed. Mechanistic models may assist. These models can optimize boiling, anticipate heat transfer, and develop high-performance geometries.

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“…NIST (2021) provides an online database that contains the complete corrected flow boiling heat transfer measurements of the Hamilton et al (2008), the Kedzierski and Park (2013), the Kedzierski and Kang (2016), and the Kedzierski and Kang (2018). The data presented in Domanski et al (2021) is also included in the database; however, it did not require correction.…”

Section: Measurementsmentioning

confidence: 99%

“…The second NIST study (Kedzierski and Park, 2013) contains the refrigerants R134a, R513A and R1234ze(E). The third NIST study (Kedzierski and Kang, 2016) contains the refrigerants R448A, R449A, and R452B. Finally, the fourth NIST study (Kedzierski and Kang, 2018) contains the refrigerants R1234yf, R134a, and R450A.…”

Section: Introductionmentioning

confidence: 99%

Horizontal convective boiling of R448A, R449A, and R452B within a micro-fin tube

Cited by 33 publications

References 21 publications

Horizontal convective boiling of R1234yf, R134a, and R450A within a micro-fin tube

Horizontal convective boiling of R1234yf, R134a, and R450A within a micro-fin tube

A Comprehensive Review on the Nucleate/Convective Boiling of Low-GWP Refrigerants: Alternatives to HFC Refrigerants

Update of legacy NIST horizontal micro-fin tube convective boiling measurements and model with current fluid property values

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