Heat transfer and pressure drop of film condensation in a horizontal minitube for HFO1234yf refrigerant

Lee, Yee-Ting; Hong, Sihui; Chien, Liang-Han; Lin, Chih-Jer; Yang, An-Shik

doi:10.1016/j.apenergy.2020.115183

Cited by 18 publications

(14 citation statements)

References 47 publications

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“…In order to evaluate the capacity of the present model for predicting the heat transfer coefficient of the discussed vapor, a comparison is presented in the Figure 9 between the experimental results of the vapor and literature. 26,27,41,42 The figure shows that the models presented in literature 26,27,41,42 are not able to predict the heat transfer coefficient of this particular vapor given the considerable disagreement. This can be attributed to the fact that the models presented in literature 26,27,41,42 were proposed for predicting the heat transfer coefficient of fluid condensation in non-rectangular tube.…”

Section: Experimental Results and Analysismentioning

confidence: 95%

“…26,27,41,42 The figure shows that the models presented in literature 26,27,41,42 are not able to predict the heat transfer coefficient of this particular vapor given the considerable disagreement. This can be attributed to the fact that the models presented in literature 26,27,41,42 were proposed for predicting the heat transfer coefficient of fluid condensation in non-rectangular tube. Shah 41 under predicts the data because the correlation is based on large round channels while experiment is performed on rectangular channels.…”

Section: Experimental Results and Analysismentioning

confidence: 95%

“…Dobson 42 over predicts most of the data (±60% error). Jung 27 corrected the correlation of Dobson and the deviation reduce to 40%. The deviation is further reduced by Cavallini 26 correlation.…”

Section: Experimental Results and Analysismentioning

confidence: 97%

“…Most existing research has focused on the condensation of steam in a circular pipe [19][20][21][22][23] or the condensation of various refrigerants in the channel. [24][25][26][27][28][29][30][31] Research on the phenomenon of the single-sided heat transfer condensation of in the rectangular channel of a multichannel dryer is rare. Choi et al 32 studied one of the channels of the multichannel dryer.…”

Section: Introductionmentioning

confidence: 99%

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Experiment study on condensation heat transfer and pressure drop of steam flow inside rectangular tube with different aspect ratio

Yan

Ji-xian

Ren

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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In this study, the condensation heat transfer coefficient and pressure drop of steam are obtained in small rectangular tubes with different aspect ratios. The experiments were carried out on three rectangular tubes with aspect ratios of 1:2, 1:3 and 1:5, with mass flux between 25 and 45 kg/m2s, and vapor qualities between 0.1 and 0.8. The experimental data were analyzed to determine the effect of vapor quality, mass flux, and aspect ratio on the heat transfer coefficient and pressure drop. The results showed that the effect of aspect ratio on condensation heat transfer coefficient appears to be dependent on the flow pattern. For stratified flow, the condensation heat transfer coefficient increases as the mass flux increases. For annular flow, the condensation heat transfer coefficient hardly changed. The pressure drop always increases as the aspect ratio increases. Previous studies on round tube heat transfer and pressure drop correlations have not successfully predicted the small rectangular tube data; therefore, modified Shah correlation and Lockhart & Martinelli correlation are proposed, which predict the data with 20% and 23% RMS error, respectively.

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Section: Experimental Results and Analysismentioning

confidence: 95%

Section: Experimental Results and Analysismentioning

confidence: 95%

Section: Experimental Results and Analysismentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experiment study on condensation heat transfer and pressure drop of steam flow inside rectangular tube with different aspect ratio

Yan

Ji-xian

Ren

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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show abstract

“…The results demonstrated that as the angle of inclination increased both HTC and pressure drop due to frictional forces also increased. Lee et al [31] performed a numerical study of mini-tube heat exchangers by evaluating film condensation based on thermofluid characteristics. They highlighted that shear stresses over the film surface lead to an increased pressure drop and HTC.…”

Section: Introductionmentioning

confidence: 99%

Condensation Heat Transfer of R-407C in Helical Coiled Tube Heat Exchanger

et al. 2020

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The results of an experimental study to evaluate the characteristics of R-407C thermofluid during condensation in a helically coiled copper tube heat exchanger are presented. The effects of saturation temperature (Tsat), and mass and heat fluxes of refrigerant R-407C on thermal performance and pressure drop were determined. The relationship between the refrigerant wall subcooling and heat transfer coefficients was also investigated. This paper reports the effect of the temperature of the water used as cooling medium on the heat transfer rate of condensing R-407C. The study was conducted with mass flux of R-407C in the range of 100–450 kg/m2s, mass flux of the coolant water in the range of 500–5000 kg/m2s and Tsat of 31 °C, 35 °C, and 39 °C. Compared with a straight smooth tube, the use of the helical coiled (helicoidal) tube increased the condensation rate with a corresponding pressure drop that depended on the value of Tsat of the refrigerant and temperature of the coolant.

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Robust and general predictive models for condensation heat transfer inside conventional and mini/micro channel heat exchangers

Moradkhani

Hosseini

Song

2022

Applied Thermal Engineering

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Heat transfer and pressure drop of film condensation in a horizontal minitube for HFO1234yf refrigerant

Cited by 18 publications

References 47 publications

Experiment study on condensation heat transfer and pressure drop of steam flow inside rectangular tube with different aspect ratio

Experiment study on condensation heat transfer and pressure drop of steam flow inside rectangular tube with different aspect ratio

Condensation Heat Transfer of R-407C in Helical Coiled Tube Heat Exchanger

Robust and general predictive models for condensation heat transfer inside conventional and mini/micro channel heat exchangers

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