Special Issue "Hybrid Energy Recovery, Storage and Utilization in Buildings and Industrial Applications"

A special issue of Thermo (ISSN 2673-7264).

Deadline for manuscript submissions: 17 December 2021.

Special Issue Editors

Dr. Valeria Palomba
E-Mail Website
Guest Editor
National Council of Research, Institute for Advanced Energy Technologies (CNR ITAE), Messina, Italy
Interests: thermal energy conversion and storage; renewable energy; renewables system integration; HVAC systems; sorption systems; heat pumps; thermal energy storage; hybrid systems; polygeneration systems; energy system simulation
Special Issues and Collections in MDPI journals
Dr. Konstantinos Braimakis
E-Mail Website
Guest Editor
Laboratory of Steam Boilers and Thermal Plants, National Technical University of Athens, 9 Heroon Polytechniou, 15780 Athens, Greece
Interests: ORC; waste heat recovery; thermodynamics; exergy analysis; optimization

Special Issue Information

Dear Colleagues,

The Special Issue will focus on the energetic, exergetic and economic assessment of hybrid energy systems for the combined recovery, storage and utilization of diverse renewable (solar, biomass, geothermal) and waste heat sources in buildings and industrial applications. Different energy conversion pathways will be encompassed, such as heat to electricity/power, heat to heat (i.e. for space heating and domestic hot water production) and heat to cooling and refrigeration, as well as combined heat and power (CHP) and combined cooling heat and power (CCHP). These conversion pathways will be based on the implementation of various technologies, such as vapor compression cycle (VCC) heat pumps, Organic Rankine Cycle (ORC) systems, Stirling engines, micro-gas turbines, internal combustion engines, photovoltaics, and thermally-activated chillers (absorption, adsorption, and ejectors, desiccant). Furthermore, the integration of thermal and electrical energy storage (electrical as well as sensible-latent heat storage, power-to-Χ including batteries, PCMs, thermal storage tanks, concrete thermal storage systems, and cooling storage) into the aforementioned technologies is a means of enhancing their performance. A primary focus will be the comparative evaluation of these systems concerning their thermodynamic and techno-economic performance and their contribution to the reduction of their carbon footprint versus conventional energy systems.

Dr. Valeria Palomba
Dr. Konstantinos Braimakis
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 papers will be 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. Thermo is an international peer-reviewed open access quarterly 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 1000 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.


  • hybrid systems
  • energy recovery
  • energy storage
  • buildings
  • industrial applications

Published Papers (1 paper)

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Techno-Economic Optimization of Medium Temperature Solar-Driven Subcritical Organic Rankine Cycle
Thermo 2021, 1(1), 77-105; https://0-doi-org.brum.beds.ac.uk/10.3390/thermo1010007 - 21 May 2021
Cited by 1 | Viewed by 547
The present work focuses on the techno-economic assessment and multi-objective genetic algorithm optimization of small-scale (40 kWth input), solar Organic Rankine Cycle (ORC) systems driven by medium-to-high temperature (up to 210 °C) parabolic dish (PDC) and trough (PTC) collectors. The ORCs are [...] Read more.
The present work focuses on the techno-economic assessment and multi-objective genetic algorithm optimization of small-scale (40 kWth input), solar Organic Rankine Cycle (ORC) systems driven by medium-to-high temperature (up to 210 °C) parabolic dish (PDC) and trough (PTC) collectors. The ORCs are designed to maximize their nominal thermal efficiency for several natural hydrocarbon working fluids. The optimization variables are the solar field area and storage tank capacity, with the goal of minimizing the levelized cost of produced electricity (LCoE) and maximizing the annual solar conversion efficiency. The lowest LCOE (0.34 €/kWh) was obtained in Athens for a high solar field area and low storage tank capacity. Meanwhile, the maximum annual solar conversion efficiencies (10.5–11%) were obtained in northern cities (e.g., Brussels) at lower solar field locations. While PTCs and PDCs result in similar efficiencies, the use of PTCs is more cost-effective. Among the working fluids, Cyclopentane and Cyclohexane exhibited the best performance, owing to their high critical temperatures. Notably, the systems could be more profitable at higher system sizes, as indicated by the 6% LCoE decrease of the solar ORC in Athens when the nominal heat input was increased to 80 kWth. Full article
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