Special Issue "Heat Transfer in Energy Conversion Systems"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "Energy Fundamentals and Conversion".

Deadline for manuscript submissions: 31 October 2020.

Special Issue Editors

Prof. Dr. Alessandro Mauro
Website
Guest Editor
Dipartimento di Ingegneria, Università degli Studi di Napoli “Parthenope”, Centro Direzionale, Isola C4, 80143 Napoli, Italy
Interests: heat and mass transport in porous media and free fluids; finite elements; innovative energy conversion systems; renewable energy sources; geothermal energy; fuel cells; heat and mass transfer in biomedical applications; waste to energy systems
Special Issues and Collections in MDPI journals
Prof. Dr. Nicola Massarotti
Website
Guest Editor
Dipartimento di Ingegneria, Università degli Studi di Napoli “Parthenope”, Centro Direzionale, Isola C4, 80143 Napoli, Italy
Interests: heat and mass transport in porous media and free fluids; finite elements; innovative energy conversion systems; renewable energy sources; geothermal energy; fuel cells; heat and mass transfer in biomedical applications; waste to energy systems
Special Issues and Collections in MDPI journals
Prof. Dr. Laura Vanoli
Website
Guest Editor
Dipartimento di Ingegneria, Università degli Studi di Napoli “Parthenope”, Centro Direzionale, Isola C4, 80143 Napoli, Italy
Interests: thermodynamic and thermo-economic analysis of advanced energy systems; energy saving; renewable energy sources; dynamic modeling of energy conversion systems; innovative energy conversion systems; energy planning; thermo-fluid-dynamic measurements

Special Issue Information

Dear Colleagues,

The purpose of This Special Issue is to collect interesting and original studies demonstrating the importance of properly taking into account heat transfer phenomena in modern energy conversion systems, in order to improve the conversion efficiency, design and operation techniques of these systems.

Given the importance of verification and validation issues for numerical codes, contributions dealing with both numerical approaches and combined numerical-experimental approaches are appreciated and invited in the Special Issue.

Papers that analyze aspects related to heat transfer, useful for increasing the knowledge of energy conversion systems, on the basis of one or more of the following topics are also welcome:

  • Energy sources and energy conversion systems
  • Thermodynamic and thermo-economic analysis of energy systems
  • Technologies for renewable energy sources
  • Heating and air conditioning systems
  • Solar thermal and photovoltaic
  • Cogeneration
  • Energy saving
  • Geothermal energy-based systems
  • Waste to energy systems
  • Fuel cells
  • Heat exchangers/heat pipes
  • Heat transfer in porous media
  • Heat transfer in indoor environments
  • Internal flow and heat transfer
  • Multi-phase flows.

Please note that the above list is not exhaustive. Therefore, works focused on other research areas that are relevant for this Special Issue are also appreciated.

This special issue is cooperated with ThermaComp 2020 (http://www.thermacomp.com) which will be held in Budva, Montenegro, June 3-5, 2020. Papers from the conference are welcome.

Prof. Dr. Alessandro Mauro
Prof. Dr. Nicola Massarotti
Prof. Dr. Laura Vanoli
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. 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 1800 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 systems
  • Energy conversion
  • Energy saving
  • Thermo-economic analysis
  • Geothermal energy
  • Cogeneration
  • Waste to energy
  • Conduction
  • Convection
  • Radiation
  • Thermo fluid dynamics
  • Porous media
  • Numerical
  • Experimental
  • Validation
  • Verification

Published Papers (3 papers)

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Research

Open AccessArticle
Design and Comparison of Resonant and Non-Resonant Single-Layer Microwave Heaters for Continuous Flow Microfluidics in Silicon-Glass Technology
Energies 2020, 13(10), 2635; https://doi.org/10.3390/en13102635 - 21 May 2020
Abstract
This paper presents a novel concept for the co-design of microwave heaters and microfluidic channels for sub-microliter volumes in continuous flow microfluidics. Based on the novel co-design concept, two types of heaters are presented, co-designed and manufactured in high-resistivity silicon-glass technology, resulting in [...] Read more.
This paper presents a novel concept for the co-design of microwave heaters and microfluidic channels for sub-microliter volumes in continuous flow microfluidics. Based on the novel co-design concept, two types of heaters are presented, co-designed and manufactured in high-resistivity silicon-glass technology, resulting in a building block for consumable and mass-producible micro total analysis systems. Resonant and non-resonant co-planar waveguide transmission line heaters are investigated for heating of sub-micro-liter liquid volumes in a channel section at 25 GHz. The heating rates of 16 and 24 °C/s are obtained with power levels of 32 dBm for the through line and the open-ended line microwave heater, respectively. The heating uniformity of developed devices is evaluated with a Rhodamine B and deionized water mixture on a micrometer scale using the microwave-optical measurement setup. Measurement results showed a good agreement with simulations and demonstrated the potential of microwave heating for microfluidics. Full article
(This article belongs to the Special Issue Heat Transfer in Energy Conversion Systems)
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Open AccessArticle
Modeling Artificial Ground Freezing for Construction of Two Tunnels of a Metro Station in Napoli (Italy)
Energies 2020, 13(5), 1272; https://doi.org/10.3390/en13051272 - 10 Mar 2020
Abstract
An artificial ground freezing (AGF) technique in the horizontal direction has been employed in Naples (Italy), in order to ensure the stability and waterproofing of soil during the excavation of two tunnels in a real underground station. The artificial freezing technique consists of [...] Read more.
An artificial ground freezing (AGF) technique in the horizontal direction has been employed in Naples (Italy), in order to ensure the stability and waterproofing of soil during the excavation of two tunnels in a real underground station. The artificial freezing technique consists of letting a coolant fluid, with a temperature lower than the surrounding ground, circulate inside probes positioned along the perimeter of the gallery. In this paper, the authors propose an efficient numerical model to analyze heat transfer during the whole excavation process for which this AGF technique was used. The model takes into account the water phase change process, and has been employed to analyze phenomena occurring in three cross sections of the galleries. The aim of the work is to analyze the thermal behavior of the ground during the freezing phases, to optimize the freezing process, and to evaluate the thickness of frozen wall obtained. The steps to realize the entire excavation of the tunnels, and the evolution of the frozen wall during the working phases, have been considered. In particular, the present model has allowed us to calculate the thickness of the frozen wall equal to 2.1 m after fourteen days of nitrogen feeding. Full article
(This article belongs to the Special Issue Heat Transfer in Energy Conversion Systems)
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Open AccessArticle
Investigation of Start-Up Characteristics of Thermosyphons Modified with Different Hydrophilic and Hydrophobic Inner Surfaces
Energies 2020, 13(3), 765; https://doi.org/10.3390/en13030765 - 09 Feb 2020
Abstract
In this paper, the influence of wettability properties on the start-up characteristics of two-phase closed thermosyphons (TPCTs) is investigated. Chemical coating and etching techniques are performed to prepare the surfaces with different wettabilities that is quantified in the form of the contact angle [...] Read more.
In this paper, the influence of wettability properties on the start-up characteristics of two-phase closed thermosyphons (TPCTs) is investigated. Chemical coating and etching techniques are performed to prepare the surfaces with different wettabilities that is quantified in the form of the contact angle (CA). The 12 TPCTs are processed including the same CA and a different CA combination on the inner surfaces inside both the evaporator and the condenser sections. For TPCTs with the same wettability properties, the introduction of hydrophilic properties inside the evaporator section not only significantly reduces the start-up time but also decreases the start-up temperature. For example, the start-up time of a TPCT with CA = 28° at 40 W, 60 W and 80 W is 46%, 50% and 55% shorter than that of a TPCT with a smooth surface and the wall superheat degrees is 55%, 39% and 28% lower, respectively. For TPCTs with combined hydrophilic and hydrophobic properties, the start-up time spent on the evaporator section with hydrophilic properties is shorter than that of the hydrophobic evaporator section and the smaller CA on the condenser section shows better results. The start-up time of a TPCT with CA = 28° on the evaporator section and CA = 105° on the condenser section has the best start-up process at 40 W, 60 W and 80 W which is 14%, 22% and 26% shorter than that of a TPCT with smooth surface. Thus, the hydrophilic and hydrophobic modifications play a significant role in promoting the start-up process of a TPCT. Full article
(This article belongs to the Special Issue Heat Transfer in Energy Conversion Systems)
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