Experimental two-phase heat transfer coefficient and frictional pressure drop inside mini-channels during condensation with R1234yf and R134a

Illán-Gómez, Fernando; López-Belchí, Alejandro; García-Cascales, J.R.; Vera-García, F.

doi:10.1016/j.ijrefrig.2014.11.014

Cited by 72 publications

(11 citation statements)

References 20 publications

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“…With the need to replace refrigerants, it is essential to identify the heat transfer coefficient, void fraction and pressure drop in the two-phase flow of boiling and condensation, since the predictions of these values are indispensable for the optimization of refrigeration cycle components (Greco, 2008). For this reason, in the last eight years, heat transfer coefficient and pressure drop (Anwar et al, 2015;Choi et al, 2014;Del Col et al, 2013;Del Col et al, 2010;Illán-Gómez et al, 2015;Li et al, 2012;Lu et al, 2013;Mortada et al, 2012;Padilla et al, 2011;Saitoh et al, 2011;Sempértegui-Tapia and Ribatski, 2017a, b;Wang et al, 2012) and critical heat flux (Mastrullo et al, 2016;Mastrullo et al, 2017) have been evaluated under conditions of two-phase flow in smooth tubes. Most of the above-mentioned papers deal with mini and microchannels (internal diameter < 3mm, according to Kandlikar and Grande (2003)), which are typical in automotive air conditioning system applications.…”

Section: Introductionmentioning

confidence: 99%

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

Pabón

Khosravi

Nunes

et al. 2019

International Journal of Refrigeration

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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.

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Section: Introductionmentioning

confidence: 99%

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

Pabón

Khosravi

Nunes

et al. 2019

International Journal of Refrigeration

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“…In addition, for this substitution, characterizing the behavior of R1234yf during two-phase flow is fundamental. Many studies focused on the evaluation of the heat transfer coefficient of R1234yf (Anwar et al, 2015;Choi et al, 2014;Del Col et al, 2013, 2010Illán-Gómez et al, 2015;Li et al, 2012;Lu et al, 2013;Mortada et al, 2012;Saitoh et al, 2011;Sempértegui-Tapia and Ribatski, 2017;Wang et al, 2012). Padilla et al (2011) investigated the two-phase flow patterns of R1234yf.…”

Section: Nomenclaturementioning

confidence: 99%

Experimental study on the void fraction during two-phase flow of R1234yf in smooth horizontal tubes

Pabón

Pereira

Humia

et al. 2019

International Journal of Refrigeration

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.Highlights  Experiments on void fraction of R1234yf in a horizontal smooth tube  Effects of experimental conditions on void fraction of R1234yf is analyzed  Experimental data of void fraction of R1234yf are compared with correlations  The quick close valve method was used to measure the local void fraction

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“…The blue line shows the typical form of the profile. Further information can be found at Illán-Gómez et al (2015).…”

Section: Single-phase Testsmentioning

confidence: 99%

Heat transfer coefficient during condensation inside a minichannel multiport tube with R32 and R410A as working fluids

Belchí

Gómez

García-Cascales

et al. 2015

Science and Technology for the Built Environment

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The use of microchannels and minichannels in a heat exchanger has increased in recent decades. They contribute to increasing efficiency and to reducing refrigerant charge and compactness of heat exchangers. The aim of this study is to experimentally determine the heat transfer coefficient in minichannel two-phase flow processes with the low global warming potential refrigerant R32 and to compare it with the values experimentally obtained for R410A and some of the correlations encountered in the existing literature. There are a few publications studying refrigerant R32 inside multiport minichannel tubes; this has low flammability and has been classified as A2L by ASHRAE. European air-conditioning manufacturers recommend its use instead of R410A as it has lower global warming potential (R32 GWP = 675, R410A GWP = 2088). Other environmental improvements may also be considered: R32 is a monocomponent refrigerant, so recycling is easier than R410A; it is also safer according to NFPA 704 classification; and a breathing apparatus is required in the case of an accident with R410A. On the other hand, R410A flammability is lower than R32 because of the addition of R125. An installation for the study of condensation processes has been constructed at the Technical University of Cartagena, Spain. The more relevant results of heat transfer coefficient will be presented in this article. The analyzed data have been measured for R32 and R410A flowing through aluminum square multiport tubes with a hydraulic diameter of 1.16 mm, then compared. The influence of saturation temperature (or pressure), flow velocity, and vapor quality in heat transfer coefficient and frictional pressure gradient has been studied. The values considered for these variables are saturation pressure corresponding to 30 • C, 35 • C, 40 • C, 45 • C, and 50 • C; flow velocities from 100 to 800 kg/(s·m 2 ); and vapor quality from 0.05 to 0.9.

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Experimental two-phase heat transfer coefficient and frictional pressure drop inside mini-channels during condensation with R1234yf and R134a

Cited by 72 publications

References 20 publications

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

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

Experimental study on the void fraction during two-phase flow of R1234yf in smooth horizontal tubes

Heat transfer coefficient during condensation inside a minichannel multiport tube with R32 and R410A as working fluids

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Experimental two-phase heat transfer coefficient and frictional pressure drop inside mini-channels during condensation with R1234yf and R134a

Cited by 72 publications

References 20 publications

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

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

Experimental study on the void fraction during two-phase flow of R1234yf in smooth horizontal tubes

Heat transfer coefficient during condensation inside a minichannel multiport tube with R32 and R410A as working fluids

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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

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