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Energies
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Heat Transfer Enhancement in Heat Exchangers
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Heat Transfer Enhancement in Heat Exchangers

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J: Thermal Management".

Deadline for manuscript submissions: closed (30 March 2023) | Viewed by 6734

Special Issue Editors

Prof. Dr. Tadeusz Bohdal

E-Mail Website
Guest Editor
Faculty of Mechanical Engineering, Koszalin University of Technology, Raclawicka 15-17 Street, 75-620 Koszalin, Poland
Interests: heat transfer; heat exchangers; two-phase flows; boiling; condensation; minichannels
Special Issues, Collections and Topics in MDPI journals
Dr. Marcin Kruzel

E-Mail Website
Guest Editor
Faculty of Mechanical Engineering, Koszalin University of Technology, Raclawicka 15-17 Street, 75-620 Koszalin, Poland
Interests: heat transfer; heat exchangers; phase-change materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The Guest Editor are honored to invite you to submit to a Special Issue of Energies on the subject area of “Heat Transfer Intensification in Heat Exchangers“.

There are many ways to intensify heat transfer in heat exchangers. They may concern the very structure of the exchanger, including the selection of appropriate materials for the construction of walls through which the heat exchange takes place, the development and modification of the heat exchange surface, and the appropriate selection of the exchanger's elements. It is also important to select the appropriate heat transfer fluids and their thermal and flow parameters. The miniaturization of the flow spaces also contributes to a significant intensification of heat transfer, where a reduction in the hydraulic diameter is accompanied by an increase in heat transfer coefficients. During the modernization of the heat exchanger structure, attention should be paid to the change in the flow resistance of the working media. The increase in the intensification of heat exchange should not significantly increase the flow resistance. The submitted papers should be based on mathematical modeling, numerical simulations, and experimental research. Topics of interest for the publication include, but are not limited to:

  • Heat transfer fluids;
  • Heat transfer intensification;
  • Phase-change phenomenon;
  • Flow resistance;
  • Wave phenomena;
  • New designs of heat exchangers,
  • Numerical modeling;
  • Experimental research.

Prof. Dr. Tadeusz Bohdal
Dr. Marcin Kruzel
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • heat exchanger
  • innovative designs
  • heat transfer fluid
  • surface enhancement
  • heat transfer intensification

Related Special Issue

Published Papers (4 papers)

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Research

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19 pages, 4314 KiB  
Article
Experimental Investigations of the LED Lamp with Heat Sink Inside the Synthetic Jet Actuator
by Paweł Gil, Joanna Wilk, Slawomir Smolen, Rafał Gałek, Marek Markowicz and Piotr Kucharski
Energies 2022, 15(24), 9402; https://doi.org/10.3390/en15249402 - 12 Dec 2022
Cited by 1 | Viewed by 1122
Abstract
The paper presents the experimental research on the thermal management of a 150 W LED lamp with heat sink inside a synthetic jet actuator. The luminous flux was generated by 320 SMD LEDs with a nominal luminous efficacy equal to 200 lm/W mounted [...] Read more.
The paper presents the experimental research on the thermal management of a 150 W LED lamp with heat sink inside a synthetic jet actuator. The luminous flux was generated by 320 SMD LEDs with a nominal luminous efficacy equal to 200 lm/W mounted on a single PCB. Characteristic temperatures were measured with three different measurement techniques: thermocouples, infrared camera, and an estimation of the junction temperature from its calibrated dependence on the LED forward voltage. The temperature budget between the LED junction and ambient as well as the thermal resistance network was determined and analyzed. The energy balance of the LED lamp is presented along with the values of the heat flow rate and heat transfer coefficient in different regions of the LED lamp surface. For an input power supplied to the SJA equal to 4.50 W, the synthetic jet dissipated approximately 89% of the total heat generated by the LED lamp. The heat from the PCB was transferred through the front and rear surfaces of the board. For the input power of 4.50 W, approximately 91% of the heat generated by LEDs was conducted by the PCB substrate to the heat spreading plate, while the remaining 9% was dissipated by the front surface of the PCB, mostly by radiation. The thermal balance revealed that for the luminous efficacy of the investigated LEDs, approximately 60% of the electrical energy supplied to the LED lamp was converted into heat, while the rest was converted into light. Full article
(This article belongs to the Special Issue Heat Transfer Enhancement in Heat Exchangers)
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17 pages, 2093 KiB  
Article
Comparison of the Efficiency of Cross-Flow Plate Heat Exchangers Made of Varied Materials
by Krzysztof Grysa, Artur Maciąg and Artur Ściana
Energies 2022, 15(22), 8425; https://doi.org/10.3390/en15228425 - 10 Nov 2022
Viewed by 1045
Abstract
This paper discusses a mathematical model for airflow through a cross-flow plate heat exchanger. The exhaust air is used to heat the supply air. Three kinds of plates are considered: made of aluminium, copper, and steel. The purpose of this research was to [...] Read more.
This paper discusses a mathematical model for airflow through a cross-flow plate heat exchanger. The exhaust air is used to heat the supply air. Three kinds of plates are considered: made of aluminium, copper, and steel. The purpose of this research was to verify which material used to build the plate heat exchangers uses the exhaust air heat more efficiently. The method of the Trefftz function was used to determine approximate solutions to the analysed problem. The results obtained for 1.2 mm-thick plates and for external winter, summer, and spring–autumn temperatures are discussed. The results indicate that if the efficiency and price of the metals are considered, then steel is the best material for the plate heat exchanger. Thanks to the use of thin steel plates and the reduction in air exchange time to a few minutes, a cheap and efficient cross-flow heat exchanger can be obtained. Full article
(This article belongs to the Special Issue Heat Transfer Enhancement in Heat Exchangers)
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Review

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46 pages, 3526 KiB  
Review
A Critical Review on the Thermal Transport Characteristics of Graphene-Based Nanofluids
by Thirumaran Balaji, Dhasan Mohan Lal and Chandrasekaran Selvam
Energies 2023, 16(6), 2663; https://doi.org/10.3390/en16062663 - 12 Mar 2023
Cited by 1 | Viewed by 1867
Abstract
Over the past few years, considerable research work has been performed on the graphene-based nano-dispersion for improvement of the thermal conductivity and thermal characteristics of base fluid. Graphene-based dispersion shows the good stability, better enhancement in thermal conductivity, and heat transport behavior compared [...] Read more.
Over the past few years, considerable research work has been performed on the graphene-based nano-dispersion for improvement of the thermal conductivity and thermal characteristics of base fluid. Graphene-based dispersion shows the good stability, better enhancement in thermal conductivity, and heat transport behavior compared to the other nano-dispersions drawing significant attention among researchers. This article carries out comprehensive reviews on the heat transport behavior of graphene-based nano-dispersion over the past ten years. Some researchers have carried out the investigations on the various methods adopted for the preparation of graphene-based nano-dispersion, techniques involved in making good dispersion including stability characterizations. There needs to be a better agreement in results reported by the various researchers, which paves the way for further potential research needs. Some researchers studied thermo-physical properties and heat transport behavior of graphene nanofluids. Only a few researchers have studied the usage of graphene nanofluids in various fields of application, including automobile radiators, electronics cooling, heat exchangers, etc. This article reviews the different challenges faced during its development in broad areas of application, and this could be a referral to have explicit knowledge of graphene dispersions with their characterization. Moreover, this study explores the various parameters that influence the effective thermal conductivity and heat transport behavior of the graphene dispersions for the various heat transport applications, which could be a reference guide to find the potential benefits as well as drawbacks of the graphene-based nano-dispersion for future research works. Full article
(This article belongs to the Special Issue Heat Transfer Enhancement in Heat Exchangers)
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32 pages, 6499 KiB  
Review
A Comprehensive Assessment of Two-Phase Flow Boiling Heat Transfer in Micro-Fin Tubes Using Pure and Blended Eco-Friendly Refrigerants
by Neeraj Kumar Vidhyarthi, Sandipan Deb, Sameer Sheshrao Gajghate, Sagnik Pal, Dipak Chandra Das, Ajoy Kumar Das and Bidyut Baran Saha
Energies 2023, 16(4), 1951; https://doi.org/10.3390/en16041951 - 16 Feb 2023
Cited by 2 | Viewed by 1995
Abstract
This review study examines flow boiling heat transfer in micro-fin tubes using mixed and pure refrigerants with zero ozone-depleting potential (ODP) and minimal global warming potential (GWP). This investigation focuses on the extraordinary relationship between heat transfer coefficients (HTCs) and vapor quality. Since [...] Read more.
This review study examines flow boiling heat transfer in micro-fin tubes using mixed and pure refrigerants with zero ozone-depleting potential (ODP) and minimal global warming potential (GWP). This investigation focuses on the extraordinary relationship between heat transfer coefficients (HTCs) and vapor quality. Since the introduction of micro-fin heat exchanger tubes over 30 years ago, refrigerant-based cooling has improved significantly. Air conditioning and refrigeration companies are replacing widely used refrigerants, with substantial global warming impacts. When space, weight, or efficiency are limited, micro-fin heat exchangers with improved dependability are preferred. This review article discusses flow boiling concepts. The researchers used several refrigerants under different testing conditions and with varying micro-fin tube parameters. Micro-fin tubes are promising for improved heat transfer techniques. This tube increases the heat transfer area, fluid disturbance, flow speed, and direction owing to centrifugal force and HTC. As the focus shifts to improving heat transfer, pressure drop, mean vapor quality, and practical devices, this subject will grow more intriguing. A radical shift will reduce equipment size for certain traditional heat transfer systems and bring new products using micro-scale technologies. This suggested review effort helps comprehend saturation flow boiling through micro-fin tubes and find the right correlation for a given application. This domain’s challenges and future relevance are also discussed. Full article
(This article belongs to the Special Issue Heat Transfer Enhancement in Heat Exchangers)
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