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Energies
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Heat Transfer Analysis: Recent Challenges and Applications
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Heat Transfer Analysis: Recent Challenges and Applications

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

Deadline for manuscript submissions: 15 September 2025 | Viewed by 2147

Special Issue Editors

Prof. Dr. Andrzej Frąckowiak

E-Mail Website
Guest Editor
Institute of Thermal Engineering, Poznan University of Technology, 60-965 Poznan, Poland
Interests: thermodynamics; fluid mechanics; numerical methods
Dr. Bartosz Ciupek

E-Mail Website
Guest Editor
Department of Fuels and Renewable Energy, Faculty of Environmental Engineering and Energy, Institute of Thermal Energy, Poznan University of Technology, 60-965 Poznan, Poland
Interests: combustion; fuels; boilers; air protection; heat exchange; combustion chambers
Special Issues, Collections and Topics in MDPI journals
Dr. Łukasz Brodzik

E-Mail Website
Guest Editor
Institute of Thermal Energy, Poznan University of Technology, 3 Piotrowo Street, 61-138 Poznan, Poland
Interests: thermodynamics; mathematics; engineering; mechanics; energy and fuels

Special Issue Information

Dear Colleagues,

We invite you to contribute to this work.

This Special Issue is dedicated to current challenges and changes in applied heat transfer solutions. The main research focus is on the study, modeling, and optimization of heat transfer in energy devices and installations, including environmental protection in this context. The presented research should be original and demonstrate a high scientific level in terms of the conducted work. Studies of an applied research and solutions nature, as well as review materials, are also welcome. We also welcome works aimed, either directly or indirectly, at increasing the thermal efficiency of energy machines or devices within the framework of environmental protection and reducing the consumption of conventional energy sources.

Prof. Dr. Andrzej Frąckowiak
Dr. Bartosz Ciupek
Dr. Łukasz Brodzik
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 transfer
  • convection
  • radiation
  • thermal optimization
  • thermal efficiency
  • CFD modeling
  • environmental protection

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Published Papers (3 papers)

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Research

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15 pages, 6330 KiB  
Article
Application of Neural Network Models for Analyzing the Impact of Flight Speed and Angle of Attack on Flow Parameter Non-Uniformity in a Turbofan Engine Inlet Duct
by Adam Kozakiewicz, Maciej Adamczyk and Rafał Kieszek
Energies 2025, 18(8), 2064; https://doi.org/10.3390/en18082064 - 17 Apr 2025
Viewed by 182
Abstract
This study investigates the aerodynamic performance of a fourth-generation normal shockwave inlet system, with a primary focus on minimizing pressure losses and ensuring uniform airflow distribution. A computational model was developed, incorporating a section of the fuselage along with the complete inlet duct. [...] Read more.
This study investigates the aerodynamic performance of a fourth-generation normal shockwave inlet system, with a primary focus on minimizing pressure losses and ensuring uniform airflow distribution. A computational model was developed, incorporating a section of the fuselage along with the complete inlet duct. The model was discretized using a hybrid mesh approach to enhance numerical accuracy. The analysis was conducted at a flight altitude of 8000 m, encompassing 370 distinct cases defined by varying angles of attack and Mach numbers. This comprehensive parametric study yielded a dataset of 10,800 total pressure measurements across predefined sampling locations. Based on the obtained results, flow distortion coefficients in both circumferential (CDI) and radial directions (RDI) were systematically determined for each test case. The interdependencies between CDI, RDI, Mach number, and angle of attack (α) were analyzed and presented in a consolidated manner. In the second phase of the study, an artificial neural network (ANN) utilizing a Feed-Forward architecture was implemented to predict pressure distributions for intermediate flight conditions. The ANN was trained using the CFG algorithm, and the predictive accuracy was assessed through the determination coefficients computed by comparing ANN-based estimates with numerical simulation results. The findings demonstrate the efficacy of ANN-based modeling in enhancing the predictive capabilities of inlet flow dynamics, offering valuable insights for optimizing next-generation supersonic air intake systems. Full article
(This article belongs to the Special Issue Heat Transfer Analysis: Recent Challenges and Applications)
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15 pages, 3033 KiB  
Article
Particle Image Velocimetry Flow Characterisation of High-Convection Slot Nozzle Systems for Impingement Heat Transfer
by Eileen Trampe, Ida Daube, Dominik Büschgens, Herbert Pfeifer and Christian Wuppermann
Energies 2025, 18(6), 1363; https://doi.org/10.3390/en18061363 - 10 Mar 2025
Viewed by 522
Abstract
Impingement jets are used in many applications for high convective heat transfer. In order to optimise specialised nozzle systems, a comprehensive understanding of the gas flow is essential. The aim of this work is to investigate high-convective flows at Re = 10,000 to [...] Read more.
Impingement jets are used in many applications for high convective heat transfer. In order to optimise specialised nozzle systems, a comprehensive understanding of the gas flow is essential. The aim of this work is to investigate high-convective flows at Re = 10,000 to Re = 50,000 for a single slot nozzle (slot width W = 5 mm) and a slot nozzle array (distance between nozzle slots s = 70 mm) consisting of five nozzles. Particle image velocimetry measurements are taken for a distance between strip and nozzle exit of H = 50 mm and are compared to verify if the results from a single slot nozzle are transferable to a nozzle array. The presence of an array of nozzles not only creates a distinct zone where the individual jets interact but also changes the flow characteristics of the respective free jets. The potential core length in the nozzle field is significantly reduced compared to the single nozzle. It is therefore not possible to make a direct transfer of the results. Direct transferability of the results is therefore not possible. This means that further studies on whole arrays are needed to optimise nozzle arrays. Full article
(This article belongs to the Special Issue Heat Transfer Analysis: Recent Challenges and Applications)
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Review

Jump to: Research

15 pages, 304 KiB  
Review
Review of Thermal Calculation Methods for Boilers—Perspectives on Thermal Optimization for Improving Ecological Parameters
by Bartosz Ciupek and Andrzej Frąckowiak
Energies 2024, 17(24), 6380; https://doi.org/10.3390/en17246380 - 18 Dec 2024
Viewed by 862
Abstract
This article presents an overview of thermal calculation methods used in boilers powered by fossil fuels (solid, liquid or gas). The analysis was carried out mainly in terms of combustion chamber calculation methods. Changing standards and legal regulations regarding the use of fossil [...] Read more.
This article presents an overview of thermal calculation methods used in boilers powered by fossil fuels (solid, liquid or gas). The analysis was carried out mainly in terms of combustion chamber calculation methods. Changing standards and legal regulations regarding the use of fossil fuels in Europe and the world make it necessary to adapt calculation methods and boiler design to current requirements, and many of them are related to outdated boiler models or for fuels that are no longer so heavily used in industrial solutions. Current research and development trends implemented in the EU and in the world related to the issues of the European Green Deal, the Fit for 55 directive and other ecological trends in the energy sector make it necessary to verify and remodel the calculation methods used so far in terms of the thermal efficiency of the device, fuel consumption or the use of fuels not previously used in their wide range in a wider application. Hence, the knowledge and updating of the state of knowledge in the field of the thermal calculation of boilers in terms of their environmental performance is necessary and strongly sought after by researchers. It is undoubted that in the next few years, boilers will continue to be the main source of thermal energy, especially in the power industry or industry. A reasonable energy transition should be based on the direction of the thermal optimization of already functioning structures and adaptation of their operating parameters to the planned new ecological fuels in the sense of the intensification of energy converted from primary form to thermal energy, and in the last step, it should reorganize the energy and industrial sectors, leaving only these groups of devices treated as a stable and necessary source of energy. Therefore, it should be recognized that activities aimed at improving the thermal parameters of boilers should directly improve the thermal efficiency of the device, and this will translate into fuel savings and reduce their negative impact on the environment. Full article
(This article belongs to the Special Issue Heat Transfer Analysis: Recent Challenges and Applications)
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