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Recent Advanced in Heat Transfer Efficiency

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J1: Heat and Mass Transfer".

Deadline for manuscript submissions: 1 November 2024 | Viewed by 146

Special Issue Editors


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Guest Editor
Department of Industrial Engineering, Alma Mater Studiorum, University of Bologna, 40136 Bologna, Italy
Interests: heat pumps; renewable energies; nanofluids; decarbonization

E-Mail Website
Guest Editor
Department of Industrial Engineering, Alma Mater Studiorum, University of Bologna, 40136 Bologna, Italy
Interests: heat pumps; renewable energies; decarbonization; nanofluids

Special Issue Information

Dear Colleagues,

Nowadays, energy supply, clean energy, renewable energy, energy consumption and storage, environmental issues such as global warming, and sustainable development constitute important challenges. In this wide framework, a possible answer is to improve the efficiency of heat exchange. In fact, in many technological applications connected to the use of energy, the development and application of knowledge, theories, and advanced technologies on heat transfer plays a crucial role. Many different activities can be addressed, such as the use of new operating fluids, the optimization of heat exchangers and storage systems, and the development of heat pumps and their application. Concerning this latter topic, for instance, particular attention should be paid to integration with other low-enthalpy energy sources, since in many industrial processes recovery heat could be available. Moreover, concerning the use of new operating fluids, attention has to be paid to both fluids that have less of an impact on the environment, such as the use of carbon dioxide, and the use of nanofluids, which allows the heat transfer rate to be improved.

In this framework, this Energies Special Issue is devoted to the frontier state of the art and to the new perspectives in heat transfer efficiency. Papers addressing, but not limited to, the following topics are welcomed:

  • Nanofluids and their applications;
  • Heat pumps;
  • Heat exchangers;
  • Heat storage systems;
  • Computational fluid dynamics.

Dr. Eugenia Rossi Di Schio
Dr. Paolo Valdiserri
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

  • nanofluids
  • heat pumps
  • heat exchangers
  • heat storage systems
  • CFD

Published Papers (1 paper)

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Research

16 pages, 4580 KiB  
Article
Magnetic and Thermal Behavior of a Planar Toroidal Transformer
by Kahina Benamer, Azzedine Hamid, Eugenia Rossi di Schio, Abderrahim Mokhefi, Rabia Melati and Paolo Valdiserri
Energies 2024, 17(11), 2454; https://doi.org/10.3390/en17112454 (registering DOI) - 21 May 2024
Abstract
This paper presents a study on the magnetic and thermal behaviors of a planar toroidal transformer, comprising two planar toroidal coils. In our configuration, the primary coil consists of twenty turns, while the secondary coil consists of ten turns. This design combines the [...] Read more.
This paper presents a study on the magnetic and thermal behaviors of a planar toroidal transformer, comprising two planar toroidal coils. In our configuration, the primary coil consists of twenty turns, while the secondary coil consists of ten turns. This design combines the advantages of both toroidal and planar transformers: it employs flat coils, akin to those utilized in planar transformers, while retaining a toroidal shape for its magnetic core. This combination enables leveraging the distinctive characteristics of both transformer types. This study delves into electromagnetic and thermal behaviors. Electromagnetic behavior is elucidated through Maxwell’s equations, offering insights into the distribution of magnetic fields, potentials, and electric current densities. Fluid flow is modeled via the Navier–Stokes equations. By coupling these equation sets, a more comprehensive and accurate portrayal of the thermal phenomena surrounding electrical equipment is attained. Such research is invaluable in the design and optimization of electrical systems, empowering engineers to forecast and manage thermal effects more efficiently. Consequently, this aids in enhancing the reliability, durability, and performance optimization of electrical equipment. The mathematical model was solved using the finite element method integrated into the COMSOL Multiphysics software v. 6.0. The COMSOL Multiphysics simulation showed correct behavior of potential, electric field, current density, and uniformly distributed temperature. In addition, this planar toroidal coil transformer model offers many advantages, such as small dimensions, high resonance frequency, and high operating reliability. This study made it possible to identify the range of its optimal functioning. Full article
(This article belongs to the Special Issue Recent Advanced in Heat Transfer Efficiency)
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