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Energy Efficiency and Energy Saving in Buildings—2nd Edition

A Special Issue of Energies (ISSN 1996-1073) belonging to the section "G: Energy and Buildings".

Deadline for manuscript submissions: 25 December 2026 | Viewed by 774

Editors


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Guest Editor
Department of Energy Engineering, University of Seville, 41092 Sevilla, Spain
Interests: thermal modeling and simulation of buildings; building elements and HVAC systems and components; optimization of thermal systems; object-oriented programming of thermal models
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Energy Engineering, University of Seville, 41092 Sevilla, Spain
Interests: outdoor thermal comfort; characterization and integration of passive heating and cooling techniques; energy efficiency
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The investigation of energy efficiency in buildings remains a fundamental aspect of addressing the contemporary climatic, economic, and social challenges. In recent decades, research has made significant advances, leading to the development of strategies that enhance indoor comfort while simultaneously reducing energy consumption. Nevertheless, these solutions do not always result in reduced resource use. In light of the ongoing expansion of urban areas and the increasingly evident impacts of climate change, the pursuit of more efficient and sustainable measures has become increasingly urgent. While advances in architectural design, innovative materials, and smart technologies have offered promising solutions, further research is required to assess their implementation, scalability, and affordability.

This Special Issue aims to collate research investigating innovative strategies to enhance the energy efficiency of buildings while striking a balance between comfort and sustainability. It encompasses studies that address challenges such as passive system modeling, real-world applications, and the development of practical, scientifically sound solutions across different contexts.

Topics of interest for publication include, but are not limited to, the following:

  • Passive cooling and heating strategies in buildings.
  • The integration of sustainable and innovative interior conditioning technologies.
  • Integral solutions to reduce energy consumption in buildings through intelligent systems and/or renewable energies.
  • Methods for assessing energy efficiency throughout the life cycle of buildings.
  • The relationship between the reduction in indoor consumption and its impact on outdoor comfort.
  • Active thermal storage systems in buildings.
  • An evaluation of sustainable cooling or heating measures in different climates.
  • Indoor comfort implications of measures applied to a building.

Prof. Dr. José Luis Molina Félix
Dr. Teresa Rocío Palomo Amores
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-anonymized 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

  • energy efficiency in buildings
  • passives strategies
  • indoor comfort
  • sustainable technologies in buildings

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Published Papers (2 papers)

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Research

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55 pages, 2982 KB  
Article
Bridging the Gap Between Earth Sciences and Mechanical Engineering: A Systematic Approach to Model Ground Source Heat Pumps with Deep Boreholes
by Violaine Gascuel, Jasmin Raymond and Christine Rivard
Energies 2026, 19(18), 4293; https://doi.org/10.3390/en19184293 - 10 Sep 2026
Abstract
Modelling of geothermal heat pump systems rarely integrates detailed surface and subsurface components. Simplifications such as neglecting the geothermal gradient, the different geological units intersected by the systems, and/or variable building loads, are common across current modeling approaches. These simplifications are particularly problematic [...] Read more.
Modelling of geothermal heat pump systems rarely integrates detailed surface and subsurface components. Simplifications such as neglecting the geothermal gradient, the different geological units intersected by the systems, and/or variable building loads, are common across current modeling approaches. These simplifications are particularly problematic for deep systems (e.g., >1 km). A new approach is presented to model a well doublet or a deep borehole heat exchanger (DBHE) with several heat pumps, which combines a comprehensive subsurface numerical model with codes capable of handling variable heat demand throughout the year. Groundwater flow and heat transfer are simulated with the subsurface model. Operating flow rates and number of activated heat pumps are adjusted during the simulation according to their efficiency and demand at a given time. Simulated heat production is constrained by technical and safety criteria to reflect realistic building conditions. The codes allow the simulation of cases in which the geothermal system is designed to partly meet demand, while maximizing its contribution. The thermal power production and electric consumption of the system are calculated. An illustrative example is provided for a sedimentary basin with a low geothermal gradient (~23.5 °C/km) using the Bécancour area in eastern Canada. Full article
(This article belongs to the Special Issue Energy Efficiency and Energy Saving in Buildings—2nd Edition)

Review

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26 pages, 4733 KB  
Review
Balancing Efficiency and Conservation: A Review of Energy Retrofitting Approaches for Historical Buildings in the Mediterranean Context
by Simone Ferrari, Matteo Maestrello, Lorenzo Croci and Riccardo Cardelli
Energies 2026, 19(14), 3353; https://doi.org/10.3390/en19143353 - 16 Jul 2026
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Abstract
Improving the energy performance of historical buildings is a key challenge for decarbonising the European built environment. In the Mediterranean context, retrofit design is especially complex because interventions must reduce heating and cooling demand while preserving architectural and cultural values. Although research on [...] Read more.
Improving the energy performance of historical buildings is a key challenge for decarbonising the European built environment. In the Mediterranean context, retrofit design is especially complex because interventions must reduce heating and cooling demand while preserving architectural and cultural values. Although research on this topic has grown, available evidence remains fragmented, with studies often focused on individual case studies and isolated retrofit packages. This review systematises the literature on energy retrofit interventions for historical buildings in the European Mediterranean region by linking retrofit measures, energy outcomes and conservation constraints. A PRISMA-based workflow was used to select articles published between 2010 and 2025 from Scopus and Web of Science. The results show a predominance of envelope-based measures, often combined with HVAC improvements. Passive–active packages achieve the highest reported reductions, up to 87% for heating and 75% for cooling. Conservation constraints do not necessarily prevent energy improvement, but they influence the admissibility, location and invasiveness of retrofit measures. Overall, the evidence indicates that energy retrofit of Mediterranean historical buildings should focus on heating reduction, cooling resilience and hygrothermal safety. The review provides a framework for identifying compatible retrofit pathways according to the architectural and material transformability of historical buildings. Full article
(This article belongs to the Special Issue Energy Efficiency and Energy Saving in Buildings—2nd Edition)
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