Prediction of flow boiling heat transfer data for R134a, R600a and R290 in minichannels

Mikielewicz, Dariusz; Jakubowska, Blanka

doi:10.2478/aoter-2014-0036

Cited by 4 publications

(2 citation statements)

References 32 publications

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“…It was observed that the average HTC is improved with the increase of mass flux. Mikielewicz et al [10] amended the model which predicted the refrigerants flow boiling by using a large amount of experimental data. Prior works were devoted to the research of R290 flow boiling in the tubes.…”

Section: Introductionmentioning

confidence: 99%

Investigation of R290 Flow Boiling Heat Transfer and Exergy Loss in a Double-Concentric Pipe Based on CFD

2021

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In this paper, the impact of different factors on the flow boiling of R290 and R22 in double-concentric pipes are investigated through CFD numerical simulations. The numerical studies are performed by changing the inner tube diameter in the range of 3 to 7 mm, the refrigerant velocity between 1 and 5 m/s, the water velocity between 1 and 10 m/s and the saturation temperature in the range of 276 to 283 K. The heat transfer coefficient (HTC), pressure drop and exergy destruction of R290 are determined. The results show that HTC, pressure drop and exergy destruction are significantly impacted by the pipe diameter and the refrigerant velocity, but slightly impacted by water velocity and saturation temperature. Moreover, the exergy loss and pressure drop of R290 are 11.8–13.3% and 4.3–10.2% lower than those of R22. R290 has a lower energy loss than R22 in the evaporation process in the double-concentric pipe. However, the HTC of R290 is 57.3–59.7% lower than that of R22. The HTC of R290 can be optimized by increasing the pipe diameter or the R290 velocity.

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Section: Introductionmentioning

confidence: 99%

Investigation of R290 Flow Boiling Heat Transfer and Exergy Loss in a Double-Concentric Pipe Based on CFD

2021

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“…S1261-S1272 pressure drop, despite some devoted contributions [3]. Moreover, the traditional refrigerants can be also replacement by other natural refrigerants such as R600a and R290 [6]. These working fluids do not exhibit a harmful impact on the ozone layer and have a negligible GWP.…”

Section: Introductionmentioning

confidence: 99%

An improved method for flow boiling heat transfer with account of the reduced pressure effect

Jakubowska

Mikielewicz

2019

Therm sci

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Original scientific paper https://doi.org/10.2298/TSCI19S4261JIn the paper are presented the results using the authors own model to predict heat transfer coefficient during flow boiling. The model has been tested against a large selection of experimental data to investigate the sensitivity of the in-house developed model. In the work are presented the results of calculations obtained using the semi-empirical model on selected experimental flow boiling data of the refrigerants: R134a, R1234yf, R600a, R290, NH 3 , CO 2 , R236fa, R245fa, R152a, and HFE7000. In the present study, particular attention was focused on the influence of reduced pressure on the predictions of the theoretical model. The main purpose of this paper is to show the effect of the reduced pressure on the predictions of heat transfer during flow boiling.

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Effect of R-600a and distilled water on nucleate pool boiling characteristics from horizontal tubes at low and moderate heat flux

Refaey

Abdel-Aziz²,

Hussein³

et al. 2022

Heat Mass Transfer

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Prediction of flow boiling heat transfer data for R134a, R600a and R290 in minichannels

Cited by 4 publications

References 32 publications

Investigation of R290 Flow Boiling Heat Transfer and Exergy Loss in a Double-Concentric Pipe Based on CFD

Investigation of R290 Flow Boiling Heat Transfer and Exergy Loss in a Double-Concentric Pipe Based on CFD

An improved method for flow boiling heat transfer with account of the reduced pressure effect

Effect of R-600a and distilled water on nucleate pool boiling characteristics from horizontal tubes at low and moderate heat flux

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