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Energies
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Volume II: Heat Transfer and Heat Recovery Systems
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Volume II: Heat Transfer and Heat Recovery Systems

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J1: Heat and Mass Transfer".

Deadline for manuscript submissions: closed (30 April 2024) | Viewed by 7943

Image courtesy of upklyak on Freepik

Special Issue Editors

Prof. Dr. Jan Danielewicz

E-Mail Website
Guest Editor
Faculty of Environmental Engineering, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland
Interests: heat and mass transfer; waste heat recovery; heat pipes; evaporative cooling; energy economics
Special Issues, Collections and Topics in MDPI journals
Dr. Krzysztof Rajski

E-Mail Website
Guest Editor
Faculty of Environmental Engineering, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland
Interests: heat and mass transfer; waste heat recovery; heat pipes; evaporative cooling; numerical simulation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Heat transfer can be found in all modern engineering applications. It has a fundamental role in improving the efficiency of energy conversion systems. Furthermore, reducing energy consumption by heat recovery is the main route towards sustainable energy management. Recovering waste heat can be achieved with many technologies for a wide range of applications.

This Special Issue aims to present recent advances in heat transfer technology and heat recovery systems for sustainable development. While many efforts are devoted to heat recovery systems, there is a need to innovate and implement solutions in this very broad field. We invite manuscripts that cover heat exchangers, HVAC systems, wastewater heat recovery, hybrid photovoltaic–thermal collector (PV/T), and industrial waste heat recovery. Both experimental and theoretical research studies are welcome. However, papers are not restricted to the aforementioned topics.

Prof. Dr. Jan Danielewicz
Dr. Krzysztof Rajski
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 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

  • heat transfer
  • heat recovery system
  • heat exchanger
  • energy savings
  • energy efficiency
  • heating
  • ventilation
  • air conditioning
  • waste/drain water heat recovery
  • PV/T collector
  • heat pipes/thermosiphons
  • heat pump
  • low-temperature waste heat

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Related Special Issue

Published Papers (3 papers)

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Research

21 pages, 4994 KiB  
Article
Transient Behavior Analysis of the Infiltration Heat Recovery of Exterior Building Walls
by Alaa Alaidroos
Energies 2023, 16(20), 7198; https://doi.org/10.3390/en16207198 - 22 Oct 2023
Cited by 1 | Viewed by 944
Abstract
This research study investigated the transient behavior of the convection–diffusion model for the infiltration heat recovery (IHR) and the influence of the building envelope heat capacity, along with other factors. A transient numerical model was developed and validated to analyze the IHR under [...] Read more.
This research study investigated the transient behavior of the convection–diffusion model for the infiltration heat recovery (IHR) and the influence of the building envelope heat capacity, along with other factors. A transient numerical model was developed and validated to analyze the IHR under various conditions. The results highlight the role of heat capacity, thermal conductivity, wall thickness, airflow rate, airflow direction, and wall porosity on the temperature distribution and the heat recovery factor within the wall. Higher-heat-capacity walls displayed a delayed temperature rise, while low-thermal-conductivity walls reduced the conduction heat transfer and increased the IHR factor. The impact of heat capacity diminished with very low thermal conductivity walls but became evident for high-thermal-conductivity walls, particularly at higher Peclet numbers. Thicker walls enhanced the heat retention and improved the IHR, with a reduced influence of airflow rate. Higher IHR factors were associated with thicker walls, lower Peclet numbers, and higher heat capacities. The analysis also showed that the wall porosity affected the IHR with less significance than the other factors. Incorporating these findings into building energy modeling tools could improve the prediction accuracy of the thermal behavior of buildings. Accordingly, this study contributes to building physics by understanding IHR dynamics and thermal mass interactions, as well as improving building energy modeling accuracy for performance prediction. Future research can explore the impacts of additional factors on IHR and investigate the effect of IHR on the overall energy consumption of buildings. Full article
(This article belongs to the Special Issue Volume II: Heat Transfer and Heat Recovery Systems)
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16 pages, 6834 KiB  
Article
Blanket Cooling of a Fusion Reactor
by Robert Beaufait and Ludger Fischer
Energies 2023, 16(4), 1890; https://doi.org/10.3390/en16041890 - 14 Feb 2023
Cited by 1 | Viewed by 4120
Abstract
Nuclear fusion is the gateway to a whole new paradigm of energy and is a strong candidate for the decarbonization of electricity generation on a global scale. With recent developments in high-temperature super-conducting magnets, the race is on to develop sub-systems which will [...] Read more.
Nuclear fusion is the gateway to a whole new paradigm of energy and is a strong candidate for the decarbonization of electricity generation on a global scale. With recent developments in high-temperature super-conducting magnets, the race is on to develop sub-systems which will support a commercially viable fusion reactor for use as a thermal power plant. The fusion of lighter elements creates an enormous amount of heat which must be transferred away from the reactor core. These intense conditions require novel approaches to efficiently transfer very high heat loads into useable thermal energy without compromising the structural integrity of the reactor core and the surrounding components. This report outlines the concept of a fundamental approach to solve the heat transfer problem as proposed by Commonwealth Fusion System’s design for a fusion reactor. A literature review was conducted for other applications that could serve as inspirations, as well as material properties and machining methods for the proposed power exhaust system. A dive into the theoretical thermodynamic and fluid dynamic characteristics of plate heat exchangers and finned surfaces was conducted from a fundamental perspective. A laminar flow regime was studied for the purpose of setting the floor for energy needed to pump coolant while simultaneously representing the least favorable heat transfer regime between a solid surface and a fluid. The results served as a basis for dimensioning and executing numerical simulations as a means for a first look into a solution of this heat transfer problem. The results were compared with the theoretical conclusions and judged based on constraints of the system. Recommendations were made for the continued development of a corresponding system. Full article
(This article belongs to the Special Issue Volume II: Heat Transfer and Heat Recovery Systems)
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17 pages, 2705 KiB  
Article
Heat Integration for Phenols and Ammonia Recovery Process of Coal Gasification Wastewater Considering Optimization of Process Parameters
by Qiliang Ye, Jiang Zeng, Yuan Li, Peiqing Yuan and Fuchen Wang
Energies 2022, 15(23), 9258; https://doi.org/10.3390/en15239258 - 6 Dec 2022
Cited by 1 | Viewed by 2308
Abstract
A heat integration optimization method that considers the changes in process parameters is proposed to find the global optimal process scheme for a coal chemical company’s phenols and ammonia recovery process. The phenols and ammonia recovery process is simulated by Aspen Plus, and [...] Read more.
A heat integration optimization method that considers the changes in process parameters is proposed to find the global optimal process scheme for a coal chemical company’s phenols and ammonia recovery process. The phenols and ammonia recovery process is simulated by Aspen Plus, and a programming method for heat exchanger networks synthesis that can simultaneously optimize process parameters and heat integration is constructed by Matlab. Taking the total annual cost as the objective function, the following process parameters are optimized: the hot feed temperature and cold/hot feed ratio of sour water stripper, the temperature of three-step partial condensation system, the feed temperature and column pressure of both solvent distillation column and solvent stripper. The result shows that, compared with the heat integration process under original process parameters, the new heat integration process saves 14.3% energy consumption and reduces the total annual cost by about 15.1%. The new heat integration process provides guidance for the optimization of the phenols and ammonia recovery process. The proposed heat integration optimization method based on changing process parameters is an effective and practical tool that offers good application prospects. Full article
(This article belongs to the Special Issue Volume II: Heat Transfer and Heat Recovery Systems)
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