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Research on Energy Efficiency and Energy Conservation: Current State and toward a Sustainable Future

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

Deadline for manuscript submissions: 31 December 2025 | Viewed by 4578

Special Issue Editor

Dr. Saad Odeh

E-Mail Website
Guest Editor
Senior Fellow of HEA, Sydney Institute of Business and Technology, Sydney City Campus, Western Sydney University, Sydney, NSW 2000, Australia
Interests: solar thermal technologies; photovoltaics performance; energy conservation, building sustainability; energy conversion; combined heat and power; and renewable energy systems

Special Issue Information

Dear Colleagues,

Energy efficiency and energy conservation research play a major role globally in governments' sustainability plans and in their policies aimed at reducing carbon footprints. This type of research is supported by the recently enumerated United Nations 2030 sustainability goals, such as affordable and clean energy, sustainable cities and communities, and responsible consumption and production.

This Special Issue covers a wide range of topics related to mechanical engineering, thermal engineering, electrical engineering, building sustainability, green buildings, emerging technologies and approaches aimed at improving energy production and transition. We welcome new and original work that contributes to energy efficiency and energy conservation. We will only consider papers that contain a novel element, issue, approach, method, or result that inspires progress in energy efficiency and energy conservation. Topics of interest for publication include, but are not limited to:

  • Energy efficiency in buildings and building thermal performance.
  • Energy analysis and energy modeling.
  • Energy planning and energy management.
  • Energy storage, electric and thermal.
  • Clean energy materials and manufacturing process technologies.
  • Combined heat and power systems.
  • Energy control and energy auditing.
  • Electricity supply and demand.
  • New and renewable energy technologies.

Dr. Saad Odeh
Guest Editor

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

  • building sustainability
  • thermal performance
  • energy conservation
  • energy efficiency
  • energy modelling

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (3 papers)

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Research

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17 pages, 3615 KiB  
Article
Improvement in Energy Self-Sufficiency in Residential Buildings Using Photovoltaic Thermal Plants, Heat Pumps, and Electrical and Thermal Storage
by Antonio Gagliano, Giuseppe Marco Tina and Stefano Aneli
Energies 2025, 18(5), 1159; https://doi.org/10.3390/en18051159 - 27 Feb 2025
Cited by 1 | Viewed by 630
Abstract
Promoting complete decarbonization by entrusting the energy supply through renewable sources (wind, photovoltaic, solar thermal, etc.) is one of the key strategies in the building sector. However, renewable energy’s intermittent and space–time mismatch characteristics pose challenges to its compatibility with the power grid. [...] Read more.
Promoting complete decarbonization by entrusting the energy supply through renewable sources (wind, photovoltaic, solar thermal, etc.) is one of the key strategies in the building sector. However, renewable energy’s intermittent and space–time mismatch characteristics pose challenges to its compatibility with the power grid. Challenges can be mitigated by introducing thermal and electrical storage to increase the self-consumption of renewable energy in the buildings. This work proposes a comparison between different energy systems equipped with a heat pump, solar plant (photovoltaic or photovoltaic thermal), and thermal and electrical storage. All year-round performances of the different energy system configurations have been simulated using the TRNSYS 17.2 software. The energy analyses revealed that the energy system equipped with a photovoltaic plant, when incorporating the two storages, improves self-consumption (Rsc) from 34.1% to 69.4 and self-sufficiency (Dss) from 27.9% to 59.9%, respectively. Additionally, the energy system equipped with photovoltaic thermal collectors and both storages further improve the system performance; an Rsc of 96.2% and Dss of 86.9% are attained. These results demonstrate that the previous energy system configuration can facilitate the near attainment of net-zero energy buildings. Furthermore, the proposed energy system is characterized by a minimal energy imbalance between the building’s energy demand and the energy produced, thereby reducing the need for energy exchange with the electrical grid. Full article
(This article belongs to the Special Issue Research on Energy Efficiency and Energy Conservation: Current State and toward a Sustainable Future)
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14 pages, 1909 KiB  
Article
Multi-Criteria Decision-Making for Selecting Solar Window Film Sheets for Energy Saving in Buildings
by Mohamed Alzarooni, Abdul Ghani Olabi and Montaser Mahmoud
Energies 2024, 17(15), 3722; https://doi.org/10.3390/en17153722 - 28 Jul 2024
Cited by 2 | Viewed by 1585
Abstract
Recently, there have been several advancements in the field of sustainable energy solutions, particularly in the selection of solar window film sheets. In this research, a multi-criteria decision-making approach was applied to compare three different types of window film sheets, Silver 35, TrueVue [...] Read more.
Recently, there have been several advancements in the field of sustainable energy solutions, particularly in the selection of solar window film sheets. In this research, a multi-criteria decision-making approach was applied to compare three different types of window film sheets, Silver 35, TrueVue 15, and Sterling 40, to aid in selecting the most suitable window film based on the United Arab Emirates market. The primary aim of this work is to provide decision-makers with a structured approach to enhance their choices for selecting window film sheets. The methodology employed involves evaluating various criteria, including visible light transmittance, solar energy rejected, energy transmittance, energy absorptance, cost, glare reduction, visible light reflectance interior, and fade reduction. These criteria are assessed using the Analytic Hierarchy Process (AHP) and Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS). The results demonstrate that Sterling 40 is the best choice followed by Silver 35. Based on the final TOPSIS results, the difference between the scores of these two window film sheets was not significant, while they were far from the score of TrueVue 15. Full article
(This article belongs to the Special Issue Research on Energy Efficiency and Energy Conservation: Current State and toward a Sustainable Future)
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16 pages, 581 KiB  
Technical Note
Unlocking Energy Efficiency: Debunking Myths on the Road to Decarbonization
by Paulomi Nandy, Wei Guo and Thomas Wenning
Energies 2024, 17(17), 4390; https://doi.org/10.3390/en17174390 - 2 Sep 2024
Cited by 1 | Viewed by 1266
Abstract
Energy efficiency is widely recognized as the foundational and most critical strategy for decarbonizing the manufacturing sector. Misconceptions surrounding energy efficiency measures often hinder their widespread adoption. This article aims to debunk five common myths and provides data and resources to help implement [...] Read more.
Energy efficiency is widely recognized as the foundational and most critical strategy for decarbonizing the manufacturing sector. Misconceptions surrounding energy efficiency measures often hinder their widespread adoption. This article aims to debunk five common myths and provides data and resources to help implement efficiency projects faster and more effectively to achieve greater decarbonization. First, the article challenges the myth that organizations have exhausted all possible energy efficiency opportunities by achieving voluntary energy intensity goals or energy performance certification. Second, it also addresses the misconceptions that efficiency projects are capital-intensive, require many qualified specialists, and have long investment return periods. By presenting real-world case studies and referencing commonly found efficiency opportunities, the article illustrates that energy-savings opportunities are ubiquitous. Organizations can use various contracting mechanisms as well as financial and technical resources from utility companies and government programs to lessen their burden. The notion that efficiency measures can be implemented solely in proprietorship facilities is dispelled. This article emphasizes the importance of green leases and explains that aligning decarbonization goals between the lessor and lessee can help drive savings for both parties. Finally, using unbundled renewable energy certificates as the sole pathway to decarbonization is strongly discouraged. By debunking these prevalent myths, this article aims to foster a deeper understanding of energy efficiency’s potential as a cornerstone of decarbonization efforts and to embrace it as a critical pathway toward a sustainable future. Full article
(This article belongs to the Special Issue Research on Energy Efficiency and Energy Conservation: Current State and toward a Sustainable Future)
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