Development of New Concept Air-Cooled Heat Exchanger for Energy Conservation of Air-Conditioning Machine

Ebisu, Takeshi

doi:10.1007/978-94-015-9159-1_32

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…An idea to improve surface geometry of FTHXs is to use wavy (smooth wavy or herringbone wavy) fin pattern (Cheng et al, 2009;Chu et al, 2020;Wang et al, 2002) and also interrupted fin patterns such as slit fin (Li et al, 2020;Zhi et al, 2021), offset-strip fin (Chennu and Paturu, 2011), louvered fin (Okbaz et al, 2018;Wan et al, 2020), convex-louver strip fin (DeJong and Jacobi, 1999), corrugated fin (Gholami et al, 2017) and perforated fin (Fujii et al, 1988). In addition, to achieve notable patterns, fins equipped with vortex generators (Chai and Tassou, 2018;Lotfi et al, 2014aLotfi et al, , 2014bLotfi et al, , 2016aLotfi et al, , 2016b, dimpled fin (Lotfi and Sundén, 2020b), mesh fin (Ebisu, 1999), woven wire fin (Fugmann et al, 2017(Fugmann et al, , 2020 and peripheral fin (Pussoli et al, 2012;Ribeiro and Barbosa, 2019) can be used.…”

Section: Greek Symbolsmentioning

confidence: 99%

A novel trussed fin-and-elliptical tube heat exchanger with periodic cellular lattice structures

Lotfi

Sundén

2022

HFF

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Purpose This study aims to computational numerical simulations to clarify and explore the influences of periodic cellular lattice (PCL) morphological parameters – such as lattice structure topology (simple cubic, body-centered cubic, z-reinforced body-centered cubic [BCCZ], face-centered cubic and z-reinforced face-centered cubic [FCCZ] lattice structures) and porosity value ( ) – on the thermal-hydraulic characteristics of the novel trussed fin-and-elliptical tube heat exchanger (FETHX), which has led to a deeper understanding of the superior heat transfer enhancement ability of the PCL structure. Design/methodology/approach A three-dimensional computational fluid dynamics (CFD) model is proposed in this paper to provide better understanding of the fluid flow and heat transfer behavior of the PCL structures in the trussed FETHXs associated with different structure topologies and high-porosities. The flow governing equations of the trussed FETHX are solved by the CFD software ANSYS CFX® and use the Menter SST turbulence model to accurately predict flow characteristics in the fluid flow region. Findings The thermal-hydraulic performance benchmarks analysis – such as field synergy performance and performance evaluation criteria – conducted during this research successfully identified demonstrates that if the high porosity of all PCL structures decrease to 92%, the best thermal-hydraulic performance is provided. Overall, according to the obtained outcomes, the trussed FETHX with the advantages of using BCCZ lattice structure at 92% porosity presents good thermal-hydraulic performance enhancement among all the investigated PCL structures. Originality/value To the best of the authors’ knowledge, this paper is one of the first in the literature that provides thorough thermal-hydraulic characteristics of a novel trussed FETHX with high-porosity PCL structures.

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Section: Greek Symbolsmentioning

confidence: 99%

A novel trussed fin-and-elliptical tube heat exchanger with periodic cellular lattice structures

Lotfi

Sundén

2022

HFF

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“…Increasing the surface roughness via sandblasting technique produces uneven surface with scattered bumps to induce wake formation and thus enhancing the recirculation which acts as vehicle to transport the heat at the near wall region (10,11). On the other hand micro-fabrication technique such as surface printing and embossing have been adopted to produce more structured surfaces aiming at increasing the heat transfer surface and generating secondary recirculation flow (12). The above concept has been widely adopted to produce wicked and herringbone tubes with varying cross sectional profiles to induce the turbulence (13).…”

Section: Introductionmentioning

confidence: 99%

“…Thus, fabricated grooved tubes show better overall thermal performance and are widely used in modern heat exchangers as they are instrumental in heat transfer augmentation (15). Ebisu and Torikoshi et al (12) stipulated that heat transfer enhancement inside inner grooved tubes is attributed to the formation of a uniform film layer at the sidewall of the tube which increases the wettability of the surface. L. Leal et al (6) briefly explained about passive techniques that has been widely used and resulted remarkable performance achieved in many application such as heat exchanges.…”

Section: Introductionmentioning

confidence: 99%

Pipe internal grooving using closed magnetic field system: A novel method

Rony,

Ibrahim,

Bin Muhamad

et al. 2023

Materialwissenschaft Werkst

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The present work proposes an innovative method to form microgrooves on a tube's internal surface through new machining based on the principle of the closed magnetic circuit. A newly designed machine with a magnetic grooving tool was fabricated. The tool consists of a pair of magnets positioned in the pipe to be pulled by another pairing magnet set at the pipe's external side, arranged in sequence of N−S−N−S direction so that it creates a closed magnetic field that has a greater pulling force. By controlling the magnet pair at the pipe's external side in the linear and rotational direction, the magnetic grooving tool is moved in both directions and simultaneously pulled towards the pipe surface to form the microgrooves. The experiment was carried out by adjusting the magnet's size combination and its distance to vary the magnetic strengths. The grooving dimension was examined by using an optical microscope and analysed using a 3‐dimensional laser profilometer surface analyser. With N52 class Nd2Fe12B neodymium (40×10×10 mm3), the maximum groove depth of 75.51 μm was recorded and the minimum depth of 2.33 μm was recorded by using magnet size 10×10×10 mm3. The method is capable to produce microgrooves on the copper pipe's internal surface.

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Wavy Fin, 3D Corrugated Fin, Perforated Fin, Pin Fin, Wire Mesh, Metal Foam Fin, Packings, Numerical Simulation

Saha

Ranjan

Emani

et al. 2019

Heat Transfer Enhancement in Plate and Fin Extended Surfaces

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Development of New Concept Air-Cooled Heat Exchanger for Energy Conservation of Air-Conditioning Machine

Cited by 4 publications

References 5 publications

A novel trussed fin-and-elliptical tube heat exchanger with periodic cellular lattice structures

A novel trussed fin-and-elliptical tube heat exchanger with periodic cellular lattice structures

Pipe internal grooving using closed magnetic field system: A novel method

Wavy Fin, 3D Corrugated Fin, Perforated Fin, Pin Fin, Wire Mesh, Metal Foam Fin, Packings, Numerical Simulation

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