Experimental Investigation of Pressure Drop during Two-Phase Flow of R1234yf in Smooth Horizontal Tubes with Internal Diameters of 3.2 mm to 8.0 mm

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2019-08-01
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Language
en
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INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
Abstract
In this study, the two-phase pressure drop of R1234yf refrigerant (as an alternative to R134a) in a smooth horizontal tube is investigated. Tests are carried out and under several conditions of vapor quality (0% to 100%), mass velocity (200, 300 and 400 kg/m²s), heat flux (0, 7 and 14 kW/m²) and evaporation temperatures (20°C and 30°C). The internal diameters tested are 3.2 mm, 4.8 mm, 6.4 mm and 8.0 mm. A comparison of pressure drop between R1234yf and R134a is also carried out. The results demonstrate that the two-phase pressure gradient of R1234yf is approximately 20% lower than that of R134a. The experimental data is compared with 19 correlations from the literature. From this comparison, it is concluded that the experimental data are in accordance with the correlation proposed by Xu and Fang with a mean absolute error of 20% and with approximately 65% of the data predicted within a ± 30% error band.
Description
Keywords
R1234yf, low GWP refrigerant, pressure drop, two-phase flow, Smooth horizontal tubes, R134a, Pressure drop, Two-phase flow, Low GWP refrigerant
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Citation
Garcia Pabon , J , Khosravi , A , Nunes , R & Machado , L 2019 , ' Experimental Investigation of Pressure Drop during Two-Phase Flow of R1234yf in Smooth Horizontal Tubes with Internal Diameters of 3.2 mm to 8.0 mm ' , INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID , vol. 104 , pp. 426-436 . https://doi.org/10.1016/j.ijrefrig.2019.05.019