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Research on Energy Efficiency and Energy Conservation: Current State and Pathways Toward a Sustainable Future—2nd Edition

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

Deadline for manuscript submissions: 5 December 2026 | Viewed by 1006

Editor

Dr. Saad Odeh

E-Mail Website
Guest Editor
Sydney Institute of Business and Technology, Western Sydney University, Sydney City Campus, Sydney, NSW 2000, Australia
Interests: energy; solar energy; PV and PV grid; exergy; sustainable energy
Special Issues, Collections and Topics in MDPI journals

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, the following:

  • 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 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

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

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Related Special Issue

Published Papers (2 papers)

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Research

33 pages, 5055 KB  
Article
Energy Retrofit of a 19th-Century Heritage Building Through Passive–Active Strategies: A Field-Informed H-BIM Palestinian Case Study
by Abdelnaser Dwaikat, Yazan Shamroukh, Anwar Hilal, Afif Akel Hasan and Saad Odeh
Energies 2026, 19(18), 4335; https://doi.org/10.3390/en19184335 - 13 Sep 2026
Abstract
Heritage buildings sit outside most national energy codes, yet Palestine alone hosts over 3000 historic structures whose 80–120 cm two-leaf stone construction is absent from any published, measurement-grounded retrofit dataset. A 19th-century three-storey heritage building (Qaser Morcos, Bethlehem; net floor area 406 m [...] Read more.
Heritage buildings sit outside most national energy codes, yet Palestine alone hosts over 3000 historic structures whose 80–120 cm two-leaf stone construction is absent from any published, measurement-grounded retrofit dataset. A 19th-century three-storey heritage building (Qaser Morcos, Bethlehem; net floor area 406 m2, volume 2100 m3) was investigated through (i) in situ measurements (heat-flux meter to ISO 9869-1; infrared thermography; illuminance survey); (ii) a Heritage Building Information Model (H-BIM) built in DesignBuilder v7 with EnergyPlus 25.1 and the Jerusalem-centre typical meteorological year weather file, with end-uses other than heating, ventilation and air conditioning (HVAC) calibrated to three years of measured electricity records and the HVAC baseline comfort-normalised; (iii) a Heritage Impact Assessment per EN 16883:2017; and (iv) a 5000-run Monte Carlo uncertainty analysis on five envelope and system inputs. Two retrofit stages were evaluated: Stage 1 (passive and renewable measures—roof insulation, shading elements, LED lighting with motion sensors, solar water heating, and a 20 kWp photovoltaic system) and Stage 2 (deep envelope and system upgrade—Stage 1 plus triple-glazing, Variable Refrigerant Flow system, and a 17.5 kWp photovoltaic system). Predicted final (delivered) electricity intensity falls from 94.5 to 71.2 kWh/m2·y under Stage 1 (−24.7%) and to 63.3 kWh/m2·y under Stage 2 (−33.0%; 90% Monte Carlo uncertainty interval 59.0–70.4 kWh/m2·y), both well below the Palestinian Energy Building Code limit of 120 kWh/m2·y. On-site generation exceeds post-retrofit electrical demand under both stages, yielding a net-positive electrical balance. Direct carbon dioxide emissions fall by 6.84 t/y (−33%) at Stage 2. Discounted paybacks are 4.6 y (Stage 1) and 10.4 y (Stage 2), with internal rates of return of 24.7% and 11.7%. All proposed interventions received project-team consensus scores of ≥3/5 against EN 16883:2017 heritage-impact criteria. This study delivers a replicable simulation-based workflow for the energy assessment and heritage-compatible retrofit of thick-walled Palestinian stone buildings and one of the first field-informed heritage-retrofit datasets from the Levant. Full article
(This article belongs to the Special Issue Research on Energy Efficiency and Energy Conservation: Current State and Pathways Toward a Sustainable Future—2nd Edition)
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26 pages, 2907 KB  
Article
Market-Based Control of Integrated Electricity-Hydrogen Systems via Peer-to-Peer Co-Trading
by Adib Allahham, Nabila Ahmed Rufa’I and Sara Louise Walker
Energies 2026, 19(7), 1707; https://doi.org/10.3390/en19071707 - 31 Mar 2026
Viewed by 661
Abstract
Peer-to-peer (P2P) energy trading offers a decentralised framework for integrating distributed renewable resources. When local renewable energy generation exceeds demand, surplus electricity can be converted into hydrogen for long-duration storage, providing flexibility beyond the electricity vector. However, most existing P2P markets are focused [...] Read more.
Peer-to-peer (P2P) energy trading offers a decentralised framework for integrating distributed renewable resources. When local renewable energy generation exceeds demand, surplus electricity can be converted into hydrogen for long-duration storage, providing flexibility beyond the electricity vector. However, most existing P2P markets are focused only on electricity, do not account for network losses and are not designed to coordinate multi-vector trading with inter-temporal couplings. To address these gaps, we propose a distance-aware periodic double auction (DA-PDA) market-clearing mechanism that extends the conventional PDA by incorporating loss-aware pricing and enabling trades between peers with the lowest loss cost. The DA-PDA provides a distributed, market-based coordination mechanism for joint electricity–hydrogen trading, improving efficiency through dynamic price signals. The framework enhances system-level performance by reducing renewable curtailment, increasing utilisation of surplus electricity and enabling hydrogen-supported flexibility. Using a real-world case study, we demonstrate that sector-coupled P2P markets can improve local social welfare and act as an effective energy-conservation mechanism in highly renewable, electrified systems. Full article
(This article belongs to the Special Issue Research on Energy Efficiency and Energy Conservation: Current State and Pathways Toward a Sustainable Future—2nd Edition)
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