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Energies
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Exergy Analysis of Energy Systems
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Exergy Analysis of Energy Systems

A special issue of Energies (ISSN 1996-1073).

Deadline for manuscript submissions: closed (31 May 2016) | Viewed by 11711

Special Issue Editors

Prof. Dr. Tatiana Morosuk

E-Mail Website
Guest Editor
Chair of Exergy-based Methods for Refrigeration Systems, Technische Universität Berlin, Marchstraße 18, 10587 Berlin, Germany
Interests: energy engineering and refrigeration; energy storage; applied thermodynamics; exergy-based methods; development of energy, cost, and environmentally effective energy-conversion technologies
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. George Tsatsaronis

E-Mail Website
Guest Editor
Institute for Energy Engineering, Technische Universität Berlin, Marchstraße 18, 10587 Berlin, Germany
Interests: energy engineering, combustion technology, exergy-based methods, development, design, simulation and analysis of energy-conversion processes, optimization of the design and operation of energy systems, energy storage, decarbonization, and power plant technology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue focuses on the application of exergy analysis and exergy-based methods to the evaluation, improvement, and optimization of different energy-conversion systems.

Exergy analysis is recognized as the most effective method for evaluating the quality of energy carriers, the inefficiencies in energy-conversion or energy-intensive chemical processes, and the rational use of energy.

Research contributions in the area of developing and improving exergy-based methods, as well as the application of these methods to energy systems, are invited.

Prof. Dr. Tatiana Morosuk
Prof. Dr.-Ing. George Tsatsaronis
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

  • exergy analysis

  • exergetic efficiency

  • exergy destruction

  • exergoeconomics

  • exergetic cost

  • extended exergy analysis

  • energy-conversion systems

Published Papers (2 papers)

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Research

1774 KiB  
Article
Exergy and Thermoeconomic Analyses of Central Receiver Concentrated Solar Plants Using Air as Heat Transfer Fluid
by Claudia Toro, Matteo V. Rocco and Emanuela Colombo
Energies 2016, 9(11), 885; https://doi.org/10.3390/en9110885 - 28 Oct 2016
Cited by 15 | Viewed by 4903
Abstract
The latest developments in solar technologies demonstrated that the solar central receiver configuration is the most promising application among concentrated solar power (CSP) plants. In CSPs solar-heated air can be used as the working fluid in a Brayton thermal cycle and as the [...] Read more.
The latest developments in solar technologies demonstrated that the solar central receiver configuration is the most promising application among concentrated solar power (CSP) plants. In CSPs solar-heated air can be used as the working fluid in a Brayton thermal cycle and as the heat transfer fluid for a Rankine thermal cycle as an alternative to more traditional working fluids thereby reducing maintenance operations and providing the power section with a higher degree of flexibility To supply thermal needs when the solar source is unavailable, an auxiliary burner is requested. This configuration is adopted in the Julich CSP (J-CSP) plant, operating in Germany and characterized by a nominal power of 1.5 MW, the heat transfer fluid (HTF) is air which is heated in the solar tower and used to produce steam for the bottoming Rankine cycle. In this paper, the J-CSP plant with thermal energy storage has been compared with a hybrid CSP plant (H-CSP) using air as the working fluid. Thermodynamic and economic performances of all the simulated plants have been evaluated by applying both exergy analysis and thermoeconomic analysis (TA) to determine the yearly average operation at nominal conditions. The exergy destructions and structure as well as the exergoeconomic costs of products have been derived for all the components of the plants. Based on the obtained results, the thermoeconomic design evaluation and optimization of the plants has been performed, allowing for improvement of the thermodynamic and economic efficiency of the systems as well as decreasing the exergy and exergoeconomic cost of their products. Full article
(This article belongs to the Special Issue Exergy Analysis of Energy Systems)
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6557 KiB  
Article
Influence of Droplet Size on Exergy Destruction in Flow of Concentrated Non-Newtonian Emulsions
by Rajinder Pal
Energies 2016, 9(4), 293; https://doi.org/10.3390/en9040293 - 16 Apr 2016
Cited by 5 | Viewed by 5891
Abstract
The influence of droplet size on exergy destruction rate in flow of highly concentrated oil-in-water emulsions was investigated experimentally in a cone and plate geometry. The oil concentration was fixed at 74.5% by volume. At this dispersed-phase (oil) concentration, two different droplet size [...] Read more.
The influence of droplet size on exergy destruction rate in flow of highly concentrated oil-in-water emulsions was investigated experimentally in a cone and plate geometry. The oil concentration was fixed at 74.5% by volume. At this dispersed-phase (oil) concentration, two different droplet size emulsions were prepared: fine and coarse emulsions. The fine and coarse emulsions were mixed in different proportions to vary the droplet size distribution. Although the dispersed and matrix phases of the emulsions were Newtonian in nature, the emulsions exhibited a non-Newtonian (shear-thinning) behavior due to the high droplet concentration. The shear stress—shear rate data of the emulsions could be described adequately by a power law model. At low shear rates, the exergy destruction rate per unit volume of emulsion exhibited a minimum at a fine emulsion proportion of 35%. The results from the cone and plate geometry were used to simulate exergy loss in pipeline flow of emulsions. The pumping of emulsions becomes more efficient thermodynamically upon mixing of fine and coarse emulsions provided that the flow regime is maintained to be laminar and that the Reynolds number is kept at a low to moderate value. In the turbulent regime, the exergy loss generally increases upon mixing the fine and coarse emulsions. Full article
(This article belongs to the Special Issue Exergy Analysis of Energy Systems)
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