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Renewable Energy Systems and Energy Conservation: Efficiency, Optimization and Sustainable Solutions

A special issue of Sustainability (ISSN 2071-1050). This special issue belongs to the section "Energy Sustainability".

Deadline for manuscript submissions: closed (15 September 2023) | Viewed by 5072

Special Issue Editors

Dr. Tingting Zhu

E-Mail Website
Guest Editor
Faculty of Engineering Technology, University of Twente, 7500 AE Enschede, The Netherlands
Interests: composite energy system; solar energy; heat pump; thermal energy storage, heat and mass transfer
Special Issues, Collections and Topics in MDPI journals
Dr. Jierong Liang

E-Mail Website
Guest Editor
Department of Mechanical Engineering, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
Interests: energy system; heat pump system; thermodynamics; heat and mass transfer
Dr. Brice Lucien Maurice Rogié

E-Mail Website
Guest Editor
Department of Mechanical Engineering, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
Interests: energy system; computational fluid dynamics; topology optimization; heat and mass transfer
Dr. Jing Hua

E-Mail Website
Guest Editor
Department of Building Environment and Energy Application Engineering, College of Civil Engineering, Taiyuan University of Technology, Taiyuan, China
Interests: urban heating system; low carbon heating; heat and mass transfer; energy management

Special Issue Information

Dear Colleagues,

Reducing the use of fossil fuels and their related emissions can be achieved by increasing the utilization of renewable energy and improving the efficiency of existing energy utilization technologies. From a system point of view, rational integration of energy in different forms (renewable energy, ambient energy, excess energy, etc.) and efficient operation control are the focus of research. From a component point of view, improving heat transfer and its operation efficiency is the research goal. The optimization of components and systems toward more sustainable and environmentally friendly solutions, under economical and technical constraints, will be the research direction of energy systems. The research topic of the above scientific issues needs to explore the methods and different approaches of energy system integration, using high-efficiency energy technologies (heat pumps, heat storage, etc.) and advanced optimization methods.

To address the related challenges, this Special Issue aims to provide a venue for academic and industry professionals to disseminate their research findings to discuss and explore future energy system solutions on emerging areas and to describe the possibility of interdisciplinary-based energy system applications.

Topics for the Special Issue include but are not limited to:

  • Renewable energy integration
  • Multisource energy system
  • District heating
  • Alternative heating and cooling
  • Heat pump system
  • Cooling technology
  • Energy storage technologies
  • Component optimization using CFD
  • Control strategy and management of energy system
  • Exergy and thermodynamics
  • Energy conversion systems and processes

Dr. Tingting Zhu
Dr. Jierong Liang
Dr. Brice Lucien Maurice Rogié
Dr. Jing Hua
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. Sustainability 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 2400 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

  • renewable energy
  • efficiency
  • district heating
  • energy storage
  • component optimization composite energy system
  • solutions
  • operation and control strategy
  • decarbonization

Published Papers (3 papers)

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Research

22 pages, 3136 KiB  
Article
A Numerical Study of Vapor–Liquid Equilibrium in Binary Refrigerant Mixtures Based on 2,3,3,3-Tetrafluoroprop-1-ene
by Li Sun, Jierong Liang and Tingting Zhu
Sustainability 2023, 15(19), 14482; https://doi.org/10.3390/su151914482 - 04 Oct 2023
Viewed by 899
Abstract
The binary refrigerant mixtures containing 2,3,3,3-Tetrafluoroprop-1-ene are considered as excellent substitutes for traditional refrigerants. Weak hydrogen bonds exist in hydrofluorocarbons and hydrofluoroolefins. However, for several recently published binary refrigerant mixtures, there is no Vapor–Liquid Equilibrium calculation study considering hydrogen-bonding associations. This work presents [...] Read more.
The binary refrigerant mixtures containing 2,3,3,3-Tetrafluoroprop-1-ene are considered as excellent substitutes for traditional refrigerants. Weak hydrogen bonds exist in hydrofluorocarbons and hydrofluoroolefins. However, for several recently published binary refrigerant mixtures, there is no Vapor–Liquid Equilibrium calculation study considering hydrogen-bonding associations. This work presents a calculation work of the saturated properties of nine pure refrigerants using the Cubic-Plus-Association Equation of State, considering the hydrogen-bonding association in refrigerant fluids. The average relative deviations of the saturated vapor pressure, liquid, and vapor density are less than 1.0%, 1.5%, and 3.5%, respectively. The Vapor–Liquid Equilibrium of ten binary refrigerant mixtures containing 2,3,3,3-Tetrafluoroprop-1-ene is also calculated using the Cubic-Plus-Association Equation of State with the van der Waals mixing rule. The average relative deviations of the liquid-phase and vapor-phase mole fractions are less than 1.0% and 2.0%, respectively. Moreover, the Vapor–Liquid Equilibrium data and the model’s adaptability are analyzed and discussed. Full article
(This article belongs to the Special Issue Renewable Energy Systems and Energy Conservation: Efficiency, Optimization and Sustainable Solutions)
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15 pages, 3720 KiB  
Article
Experimental Analysis of the Discharge Valve Movement of the Oil-Free Linear Compressor in the Refrigeration System
by Chengzhan Li, Jian Sun, Huiming Zou, Jinghui Cai and Tingting Zhu
Sustainability 2023, 15(7), 5853; https://doi.org/10.3390/su15075853 - 28 Mar 2023
Viewed by 1205
Abstract
In a linear compressor, the valve motion significantly affects the thermodynamic efficiency and the compressor’s reliability, especially in oil-free conditions. To better understand the dynamic behavior of the discharge valve, a real-time test bench was built. The piston movements and dynamic pressure in [...] Read more.
In a linear compressor, the valve motion significantly affects the thermodynamic efficiency and the compressor’s reliability, especially in oil-free conditions. To better understand the dynamic behavior of the discharge valve, a real-time test bench was built. The piston movements and dynamic pressure in the cylinder were also observed to obtain the synchronizing characteristics among the reed valve motion, cylinder pressure, and piston motion. Observing the motion of the discharge valve visually, the discharge valve flutters due to the change in the form of the cylinder pressure, the delayed opening of the valve is caused by the inertia of the valve itself, and additional displacement fluctuations are present. This paper presents the dynamic behavior of the discharge valve under different discharge pressure/operating frequency/piston stroke/clearance length conditions. The results show that the valve flutters increase, the mean displacement of the valve increases, and the duration of the discharge increases when the discharge pressure decreases. When the operating frequency increases, the duration of the discharge decreases, while the mean displacement of the valve increases. For a high stroke or a low clearance length case, the duration of the discharge increases, while the valve flutters increase due to the pressure fluctuations in the cylinder. Through analyzing the synchronizing characteristic among the valve movements, piston movements, and cylinder pressure, it is shown that the phenomenon of the delayed opening valve is much worse for a low stroke or a high operating frequency case. In addition, the delayed closing of the valve appears for a high operating frequency case (75 Hz). Full article
(This article belongs to the Special Issue Renewable Energy Systems and Energy Conservation: Efficiency, Optimization and Sustainable Solutions)
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16 pages, 2309 KiB  
Article
Thermodynamic Performance Comparisons of Ideal Brayton Cycles Integrated with High Temperature Fuel Cells as Power Sources on Aircraft
by Zhixing Ji, Fafu Guo, Tingting Zhu, Kunlin Cheng, Silong Zhang, Jiang Qin and Peng Dong
Sustainability 2023, 15(3), 2805; https://doi.org/10.3390/su15032805 - 03 Feb 2023
Cited by 3 | Viewed by 1927
Abstract
Developing hybrid electric aircraft is propitious to reducing carbon dioxide emissions and fuel consumption. Combustion engines coupled with solid oxide fuel cells are proposed for aircraft propulsion systems, where the compressor is powered by fuel cells instead of turbines. The thermal cycle of [...] Read more.
Developing hybrid electric aircraft is propitious to reducing carbon dioxide emissions and fuel consumption. Combustion engines coupled with solid oxide fuel cells are proposed for aircraft propulsion systems, where the compressor is powered by fuel cells instead of turbines. The thermal cycle of the new engine is obviously different from that of conventional combustion engines and can be characterized in the temperature entropy diagram under some reasonable assumptions, which were analyzed and investigated. Performance parameters, such as the specific thrust, are derived and can be expressed by several fundamental thermal parameters. Three different cycles integrating Brayton cycles and SOFC are shown. The main conclusions are as follows: (1) The maximum operating pressure ratio of the Brayton cycles integrated with fuel cells is 32. The maximum thermal efficiency of the cycle at the lowest combustion temperature is 82.2%, while that of the BC is 65.1% at the high combustion temperature. (2) The new cycles can not work if the combustion temperature is lower than 1350 K. Otherwise, the fuel utilization will be too huge. Full article
(This article belongs to the Special Issue Renewable Energy Systems and Energy Conservation: Efficiency, Optimization and Sustainable Solutions)
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