R513A condensation heat transfer inside tubes: Microfin tube vs. smooth tube

Diani, Andrea; Brunello, Pierfrancesco; Rossetto, Luisa

doi:10.1016/j.ijheatmasstransfer.2020.119472

Cited by 31 publications

(8 citation statements)

References 18 publications

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“…-Several condensation and evaporation correlations inside smooth tubes were compared. Cavallini et al [25] produce a correlation with the best predictive ability for the condensation HTC; Liu and Winterton [29] accurately predicts the evaporation HTCs. -Two novel three-dimensional, composite, enhanced surfaces for use in condensation and evaporation applications have been introduced and studied in this investigation.…”

Section: Discussionmentioning

confidence: 99%

“…All the in-tube, outlet flow patterns are stratified wave flows; as can be seen at the interface of the gas-liquid for the EHT-HB/D and EHT-HB tubes, there is more disturbance shown for those tubes than the other configurations; this demonstrates their effect in disturbing the fluid in order to enhance the heat transfer. Diani et al [29] studied R513A condensation heat transfer inside smooth and microfin tubes; R513A has been proposed as alternative to R134a since it has similar properties and its lower GWP. Future work on the 3D EHT tubes using such refrigerants need to be considered.…”

Section: Condensation Heat Transfer Characteristicsmentioning

confidence: 99%

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An Experimental Study of In-Tube Condensation and Evaporation Using Enhanced Heat Transfer (EHT) Tubes

et al. 2021

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A study was carried out to determine in-tube evaporation and condensation performance of enhanced heat transfer tubes (EHT) using R410A, with the results being compared to a plain tube. The test tubes considered in the evaluation include: plain, herringbone (HB) and spiral (HX) microgrooves, herringbone dimple (HB/D), and hydrophobic herringbone (HB/HY). Experiments to evaluate the condensation were conducted at a saturation of 318 K, and at 279 K for evaporation. Mass flux (G) ranged between 40 to 230 kg m−2s−1. Condensed vapor mass decreased from 0.8 to 0.2; and the mass of vaporized vapor increases from 0.2 to 0.8; heat flux increased with G. Inlet and outlet two-phase flow patterns at 200 kg m−2s−1 were recorded and analyzed. Enhanced tube heat transfer condensation performance (compared to a plain tube) increased in the range from 40% to 73%. The largest heat transfer increase is produced by the herringbone–dimple tube (HB/D). In addition to providing drainage, the herringbone groove also helps to lift the accumulated condensate to wet the surrounding wall. Evaporation thermal performance of the enhanced tubes are from 4% to 46% larger than that of smooth tube with the best performance being in the hydrophobic herringbone tube (HB/HY). This enhancement can be attributed to an increase in the number of nucleation sites and a larger heat transfer surface area. Evaporation and condensation correlations for heat transfer in smooth tubes is discussed and compared.

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Section: Discussionmentioning

confidence: 99%

Section: Condensation Heat Transfer Characteristicsmentioning

confidence: 99%

An Experimental Study of In-Tube Condensation and Evaporation Using Enhanced Heat Transfer (EHT) Tubes

et al. 2021

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“…In this context, Diani and Rossetto [34], Liu et al [35], and Diani et al [36,37] tested microfin tubes having outer diameters of 3.0 mm, 4.0 mm, and 7.0 mm during both condensation and flow boiling with different low-GWP refrigerants, such as R513A, R450A, R515B, and R1234ze(E). The experimental tests were run in a wide range of working conditions, aiming at highlighting their effects on both the heat transfer coefficient and the frictional pressure drop.…”

Section: Two-phase Heat Transfer Inside Microfinned Tubesmentioning

confidence: 99%

Heat Transfer and Thermal Energy Storage Enhancement by Foams and Nanoparticles

Andreozzi,

Asinari,

Barletta

et al. 2023

Energies

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The use of innovative methods for the design of heating, cooling, and heat storage devices has been mainly oriented in the last decade toward the use of nanofluids, metal foams coupled with working fluids, or phase change materials (PCMs). A network of nine Italian universities achieved significant results and innovative ideas on these topics by developing a collaborative project in the last four years, where different approaches and investigation techniques were synergically employed. They evaluated the quantitative extent of the enhancement in the heat transfer and thermal performance of a heat exchanger or thermal energy storage system with the combined use of nanofluids, metal foams, and PCMs. The different facets of this broad research program are surveyed in this article. Special focus is given to the comparison between the mesoscopic to macroscopic modeling of heat transfer in metal foams and nanofluids, as well as to the experimental data collected and processed in the development of the research.

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“…Regarding the single-tube heat exchange experimental platform, it can study the heat exchange characteristics of different refrigerants in the tubes, the flow state of the refrigerants in the tubes, and the switching of various tube types [24][25][26][27]. Therefore, more and more scholars have started to build heat transfer experimental platforms to investigate the heat transfer characteristics of different refrigerants and different tube types [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Electronic Expansion Valve Experimental System Debugging Solution Based on PI Control Algorithm on Single-Tube Heat Exchange Experimental Platform

2022

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In this paper, the electronic expansion valve (EXV) on the single-tube heat exchange experimental platform was used as a research object. Firstly, the EXVs were selected according to the experimental requirements, and the functional parameters were set. Subsequently, the effective opening ranges of the EXVs were determined by manual control, and the control effects of the EXVs installed at the front and back ends of the test section were compared. Finally, by self-tuning and optimizing the best response curves, the proportional and integral coefficients suitable for the experimental platform were obtained; thus, the automatic intelligent control of EXV based on the proportional integral (PI) control algorithm was realized. From setting EXV functional parameters to realizing PI control, an appropriate experimental system-debugging solution for the whole process could be obtained. Based on the solution, the system stability could be improved, and the transition process time could be shortened. Furthermore, the solution also provided a method to guarantee the accuracy of experimental data and could be applied to the debugging of similar experimental systems.

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R513A condensation heat transfer inside tubes: Microfin tube vs. smooth tube

Cited by 31 publications

References 18 publications

An Experimental Study of In-Tube Condensation and Evaporation Using Enhanced Heat Transfer (EHT) Tubes

An Experimental Study of In-Tube Condensation and Evaporation Using Enhanced Heat Transfer (EHT) Tubes

Heat Transfer and Thermal Energy Storage Enhancement by Foams and Nanoparticles

Electronic Expansion Valve Experimental System Debugging Solution Based on PI Control Algorithm on Single-Tube Heat Exchange Experimental Platform

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