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Selected Papers from the SDEWES 2025 Conference on Sustainable Development of Energy, Water, and Environment Systems

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A: Sustainable Energy".

Deadline for manuscript submissions: 31 March 2026 | Viewed by 1106

Special Issue Editors


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Guest Editor
Department of Industrial Engineering, University of Naples Federico II, 80125 Naples, Italy
Interests: fuel cells; advanced optimization techniques; solar thermal systems; concentrating photovoltaic/thermal photovoltaic systems; energy saving in buildings; solar heating and cooling; organic Rankine cycles; geothermal energy; dynamic simulations of energy systems; renewable polygeneration systems
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E-Mail Website
Guest Editor
Department of Industrial Engineering, University of Naples Federico II, 80125 Naples, Italy
Interests: solar thermal systems; concentrating photovoltaic/thermal photovoltaic systems; energy saving in buildings; solar heating and cooling; solar desalination; geothermal energy; dynamic simulations of energy systems; renewable polygeneration systems
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Key Laboratory of Thermo-Fluid Science and Engineering (Ministry of Education), Xi’an Jiaotong University, Xi’an 710049, China
Interests: heat transfer enhancement and its applications to engineering problems; high-temperature heat transfer and fluid flow; transport phenomena in porous media; numerical simulation; prediction and optimization
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In recent decades, the integration and enhancement of energy efficiency across multiple sectors—including electricity, heating, cooling, transport, water, buildings, industry, waste, wastewater, forestry, and agriculture—have become increasingly crucial. In the context of a society striving for sustainability and the urgent need to mitigate greenhouse gas emissions, the SDEWES Conferences have established themselves as a key platform for researchers to exchange ideas, present innovations, and disseminate knowledge.

Within this framework, energy saving and emissions reduction are essential for reducing humanity’s environmental footprint. Despite considerable progress in promoting sustainable energy solutions, important challenges remain in designing and implementing technically optimal energy systems at minimal cost. Addressing these challenges requires attention to renewable energy resources for power and heat generation, advanced sustainable energy conversion and storage systems, hydrogen technologies, power-to-X approaches, and carbon capture, utilization and storage (CCUS) solutions.

This Special Issue aims to provide a comprehensive overview of state-of-the-art solutions for sustainable energy supply, spanning from technical analyses of energy components on both supply and demand sides to scenarios and pathways for decarbonization. Contributions are particularly welcome on topics including, but not limited to: energy efficiency in industry and buildings, smart energy systems, district heating and cooling, cogeneration, trigeneration, polygeneration, biofuels and alternative fuels, hybrid and electric vehicles, waste-to-energy, the biocircular economy, the water–energy–food nexus, electricity transmission and distribution, digitalization and AI applications for energy systems, energy storage and batteries, energy markets and policy, gas security of supply, climate change mitigation and adaptation strategies, decarbonization pathways, and resilience of energy infrastructure.

The 20th Conference on Sustainable Development of Energy, Water and Environment Systems—SDEWES Conference will be held on the 5–10 October 2025 in Dubrovnik (Croatia). The 1st African SDEWES Conference was held on the 27–31 May 2025 in Oujda–Saidia (Morocco). These SDEWES Conferences are dedicated to the improvement and dissemination of knowledge concerning methods, policies, and technologies for increasing the sustainability of development by de-coupling growth from natural resources and replacing resource exploitation with a knowledge-based economy, taking into account economic, environmental, and social pillars.

We especially encourage submissions that explore integrated energy systems without traditional sector boundaries, highlighting synergies across electricity, heating, cooling, transport, and industrial demands.

Prof. Dr. Francesco Calise
Dr. Maria Vicidomini
Prof. Dr. Qiuwang Wang
Prof. Dr. Wenxiao Chu
Prof. Dr. Poul Alberg Østergaard
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

  • renewable energy resources
  • power and heat generation
  • advanced energy storage systems
  • power-to-X
  • hydrogen economy and technologies
  • carbon capture, utilization and storage (CCUS)
  • energy efficiency in industry and buildings
  • smart energy systems
  • district heating and/or cooling
  • cogeneration, trigeneration, polygeneration
  • biofuels and alternative fuels
  • hybrid and electric vehicles
  • waste-to-energy
  • biocircular economy
  • water–energy–food nexus
  • electricity transmission and distribution
  • digitalization and AI for energy systems
  • energy storage and batteries
  • energy markets
  • energy policy
  • gas security of supply
  • climate change mitigation strategies
  • decarbonization pathways
  • resilience of energy infrastructure

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Published Papers (2 papers)

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Research

20 pages, 2736 KB  
Article
Operational Optimization of Steam Turbine Systems for Time Series in Hourly Resolution: A Systematic Comparison of Linear, Quadratic and Nonlinear Approaches
by Louisa Zaubitzer, Maurice Görgen and Frank Alsmeyer
Energies 2026, 19(3), 589; https://doi.org/10.3390/en19030589 (registering DOI) - 23 Jan 2026
Abstract
Computer-aided modeling and mathematical optimization of energy systems are essential for improving operational efficiency and achieving emission reductions, particularly for steam turbine systems with part-load-dependent efficiency characteristics. Mixed-Integer Linear Programming (MILP) is the state of the art, due to its short computational times [...] Read more.
Computer-aided modeling and mathematical optimization of energy systems are essential for improving operational efficiency and achieving emission reductions, particularly for steam turbine systems with part-load-dependent efficiency characteristics. Mixed-Integer Linear Programming (MILP) is the state of the art, due to its short computational times and reliable convergence. However, its simplifications often reduce model accuracy. Mixed-Integer Nonlinear Programming (MINLP) offers high accuracy but faces long computational times and potential convergence issues. Recent advancements in Mixed-Integer Quadratically Constrained Programming (MIQCP) offer a promising approach for more accurate energy system modeling by enabling quadratic and bilinear representations while avoiding the full complexity of nonlinear programs. This study compares the optimization methods MILP, MINLP and MIQCP for the operational optimization of a steam turbine system. The parameterization of the models is based on hourly measurement data of two real-world steam turbines. Key evaluation criteria include accuracy, computational time, implementation complexity and the deviation in the calculated optimum. The results show that MIQCP improves accuracy compared with MILP while requiring lower computational time than MINLP. Overall, the results demonstrate that MIQCP provides a suitable compromise between model accuracy and computational efficiency for the operational optimization of steam turbine systems. Full article
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16 pages, 2976 KB  
Article
Performance Simulation of an Unglazed Transpired Solar Collector: Two-Dimensional and Three-Dimensional Analysis
by Giedrė Streckienė and Martin Piskulov
Energies 2026, 19(2), 481; https://doi.org/10.3390/en19020481 - 19 Jan 2026
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Abstract
The growing depletion of fossil fuel resources and rising energy costs underscore the need for efficient renewable energy technologies, such as unglazed transpired solar collectors (UTSCs). UTSCs harness solar energy to preheat outdoor air, thereby improving building energy efficiency and reducing reliance on [...] Read more.
The growing depletion of fossil fuel resources and rising energy costs underscore the need for efficient renewable energy technologies, such as unglazed transpired solar collectors (UTSCs). UTSCs harness solar energy to preheat outdoor air, thereby improving building energy efficiency and reducing reliance on conventional heating systems. This study presents a computational fluid dynamics (CFD) analysis of UTSC performance under Lithuanian winter conditions (ambient air temperature −2.64 °C, solar irradiance 733.45 W/m2, wind speed 1.93 m/s) using two- and three-dimensional models developed in ANSYS FLUENT. The 3D model simulates a realistic wall fragment with multiple repeating sheet metal profiles and an air gap, while the 2D model represents a longitudinal section applicable to generic UTSC configurations. Both models were validated against experimental data and used to evaluate airflow velocity, pressure distribution, and air temperature rise. The results indicate overall thermal efficiencies of 54.32% for the 3D model and 54.07% for the 2D model, demonstrating that simplified 2D models can achieve comparable accuracy while significantly reducing computational cost. These findings highlight the potential of high-resolution CFD modelling for optimizing UTSC design and enabling faster, more reliable assessments for integration in industrial and commercial building applications. Full article
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