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Advances in Thermal Engineering Research and Applied Technologies

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

Deadline for manuscript submissions: 20 September 2026 | Viewed by 1205

Special Issue Editors


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Guest Editor
Institute for Sustainable Energy, University of Malta, Barrakki Street, Marsaxlokk, MXK 1531, Malta
Interests: energy performance of buildings; solar photovoltaic systems; solar heating systems; heat pumps for heating and cooling; shallow-ground geothermal systems; solar and UV radiation monitoring
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Mechanical Engineering, Faculty of Engineering, University of Malta, Msida, MSD 2080, Malta
Interests: thermal management in electrical machines; fluid dynamics; applied thermodynamics; computational fluid dynamics (CFD); heating ventilation and air conditioning (HVAC); heat transfer and electronics cooling
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue aims to cover a wide range of topics in thermal engineering and technology such as the following: Multi-phase flow and heat transfer; Heat and mass transfer in the ecosystem; Heat and mass transfer in biomedical devices; Biofuels and internal combustion engines; Micro/nano heat transfer; Biological heat transfer; Double diffusive convection; Melting and solidification; Numerical methods in fluid flow and heat transfer; Internal flow and heat transfer; Transport phenomena in porous media; Environmental engineering; Enhanced oil recovery; Polymer processing science and technology; Waste management and waste disposal; Heat transfer with non-newtonian fluid flow; Energy management and energy systems; Air conditioning and refrigeration; Renewable energy; Micro/nanofluidics and life science application; Novel Materials: Thermal vias, heat spreaders and thermal interface materials; Thermal management in wireless, networking, computing, lighting, and harsh environments; Sub-Ambient Cooling: solid state, vapor compression, absorption, adsorption, micro-fabricated thermal management devices and systems; Advances in experimental characterization; Advances in Computational Characterization: multi-scale modeling and multi-physics modeling; Single-phase liquid cooling; Novel phase change cooling techniques; Hybrid energy storage systems; Hydrogen logistics and supply chain; Performance and fuel efficiency; Hydrogen production market analysis; Safety when storing hydrogen tanks; Hydrogen applications in the aviation/aerospace industry; The use of hydrogen to reduce global warming; Hydrogen as an alternative fuel. Contributions to this Special Issue can be experimental, numerical, or both. The 17th International Conference on Thermal Engineering (ICTEA, www.ictea.ca) is to be held in Valletta, Malta, 22–24 June 2026. The conference covers significant topics related to this Special Issue.

Papers attracting the most interest at the conference, or those that provide novel contributions, will be selected for publication in this Special Issue of Energies. These papers will be peer-reviewed for the validation of their research results, developments, and applications. We also welcome original research and review papers that are not from the conference but that are focused on the topics that will be covered at the conference.

Prof. Dr. Charles Yousif
Prof. Christopher Micallef
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 250 words) can be sent to the Editorial Office for assessment.

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

  • thermal engineering
  • heat transfer
  • multi-phase flow
  • energy conversion
  • environmental engineering

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Published Papers (1 paper)

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Research

27 pages, 3551 KB  
Article
Machine-Learning-Based Parameterisation of Soil Thermal Conductivity for Shallow Geothermal and Ground Heat Exchanger Modelling
by Mateusz Żeruń, Ewa Jagoda and Edyta Majer
Energies 2026, 19(8), 1827; https://doi.org/10.3390/en19081827 - 8 Apr 2026
Viewed by 416
Abstract
Thermal conductivity is a key input parameter in geotechnical and shallow geothermal engineering, directly influencing the design, efficiency, and long-term performance of ground heat exchangers, energy piles, and ground-source heat pump systems. Reliable parameterisation of this property in sandy soils remains challenging due [...] Read more.
Thermal conductivity is a key input parameter in geotechnical and shallow geothermal engineering, directly influencing the design, efficiency, and long-term performance of ground heat exchangers, energy piles, and ground-source heat pump systems. Reliable parameterisation of this property in sandy soils remains challenging due to nonlinear interactions between water content, bulk density, and soil structure. This study develops a machine-learning-based workflow for robust parameterisation of thermal conductivity in quartz-rich sands using a large, internally consistent laboratory dataset comprising 1716 samples, including 1455 moist measurements used for modelling, obtained from nationwide site investigations. Air-dry specimens were identified as laboratory-induced drying states and excluded to restrict the analysis to hydro-mechanical conditions representative of typical shallow subsurface environments. Several regression algorithms representing different modelling strategies were evaluated within a unified and reproducible framework and benchmarked against selected classical empirical formulations. Model performance was assessed using standard accuracy metrics together with diagnostics describing the functional stability of predicted thermal-conductivity surfaces. The results reveal a systematic trade-off between predictive accuracy and functional consistency, indicating that models optimised for accuracy may produce functionally unstable and less suitable parameterisations for engineering applications. Accuracy-optimised models frequently produce locally irregular parameter fields, whereas more strongly regularised models yield smoother and physically more coherent response surfaces. The proposed workflow supports reliable thermal-property parameterisation for geotechnical design and shallow geothermal modelling. Full article
(This article belongs to the Special Issue Advances in Thermal Engineering Research and Applied Technologies)
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