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Entropy
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Applications of Thermofluids in Power Generation Systems
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Applications of Thermofluids in Power Generation Systems

A special issue of Entropy (ISSN 1099-4300). This special issue belongs to the section "Thermodynamics".

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 3801

Special Issue Editors

Dr. Apostolos Gkountas

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Guest Editor
Department of Mechanical Engineering, University of West Attica, 12244 Athens, Greece
Interests: applied thermodynamics; power generation cycles; heat-to-power conversion; supercritical CO2; heat transfer; cycles innovation; fluid mechanics; heat exchangers design
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Ioannis Sarris

E-Mail Website
Guest Editor
Department of Mechanical Engineering, University of West Attica, Thivon 250, 12241 Aigaleo, Greece
Interests: magnetohydrodynamics; turbulence; nanofluids; convective heat transfer; biological flows; liquid metals
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

At present, the efficiency of power generation systems concentrates a great deal of research interest, since energy consumption globally needs to be reduced for environmental and financial reasons. The main goal of this Special Issue is to present the current state-of-the-art and the recent progress in the field of applied thermodynamics, heat transfer, and the application of thermofluids for power generation systems, towards improved energy efficiency. The integration of innovative methods (including analytical and numerical methods) or materials (in the direction of energy storage), the investigation of new working fluids or cycles, the combination of cycles or the use of components that could lead to improved efficiency may be presented in this Special Issue.

Dr. Apostolos Gkountas
Prof. Dr. Ioannis Sarris
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. Entropy is an international peer-reviewed open access monthly 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.

Published Papers (2 papers)

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Research

13 pages, 3343 KiB  
Article
Predicting NOx Distribution in a Micro Rich–Quench–Lean Combustor Using a Variational Autoencoder
by Peiliang Yan, Weijun Fan and Rongchun Zhang
Entropy 2023, 25(4), 604; https://doi.org/10.3390/e25040604 - 1 Apr 2023
Viewed by 1344
Abstract
Micro gas turbines are widely used in distributed power generation systems. However, the combustion of gas turbine combustors produces a large amount of nitrogen oxides (NOx), which pollute the environment and endanger human life. To reduce environmental pollution, low-emission combustors have been developed. [...] Read more.
Micro gas turbines are widely used in distributed power generation systems. However, the combustion of gas turbine combustors produces a large amount of nitrogen oxides (NOx), which pollute the environment and endanger human life. To reduce environmental pollution, low-emission combustors have been developed. In recent years, there has been an increasing focus on the use of low-heat-value gas fuels, and it is necessary to study the NOx emissions from low heat value gas fuel combustors. Data-driven deep learning methods have been used in many fields in recent years. In this study, a variational autoencoder was introduced for the prediction of NOx production inside the combustor. The combustor used was a micro rich–quench–lean combustor designed by the research group using coal bed gas as a fuel. The internal NO distribution contour was obtained as the dataset using simulation methods, with a size of 60 images. The model architecture parameters were obtained through hyperparameter exploration using the grid search method. The model accurately predicted the distribution of NO inside the combustor. The method can be applied in the prediction of a wider range of parameters and offers a new way of designing combustors for the power industry. Full article
(This article belongs to the Special Issue Applications of Thermofluids in Power Generation Systems)
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17 pages, 4652 KiB  
Article
Large Eddy Simulation and Thermodynamic Design of the Organic Rankine Cycle Based on Butane Working Fluid and the High-Boiling-Point Phenyl Naphthalene Liquid Heating System
by Alon Davidy
Entropy 2022, 24(10), 1461; https://doi.org/10.3390/e24101461 - 13 Oct 2022
Cited by 1 | Viewed by 1752
Abstract
Large Eddy Simulation (LES) and Thermodynamic study have been performed on Organic Rankine Cycle (ORC) components (boiler, evaporator, turbine, pump, and condenser). The petroleum Coke burner provided the heat flux needed for the butane evaporator. High boiling point fluid (called phenyl-naphthalene) has been [...] Read more.
Large Eddy Simulation (LES) and Thermodynamic study have been performed on Organic Rankine Cycle (ORC) components (boiler, evaporator, turbine, pump, and condenser). The petroleum Coke burner provided the heat flux needed for the butane evaporator. High boiling point fluid (called phenyl-naphthalene) has been applied in the ORC. The high boiling liquid is safer (steam explosion hazard may be prevented) for heating the butane stream. It has best exergy efficiency. It is non-corrosive, highly stable, and flammable. Fire Dynamics Simulator software (FDS) has been applied in order to simulate the pet-coke combustion and calculate the Heat Release Rate (HRR). The maximal temperature of the 2-Phenylnaphthalene flowing in the boiler is much less than its boiling temperature (600 K). Enthalpy, entropy and specific volume required for evaluating the heat rates and the power have been computed by employing the THERMOPTIM thermodynamic code. The proposed design ORC is safer. This is because the flammable butane is separated from the flame produced in the petroleum coke burner. The proposed ORC obeys the two fundamental laws of thermodynamics. The calculated net power is 3260 kW. It is in good agreement with net power is reported in the literature. The thermal efficiency of the ORC is 18.0%. Full article
(This article belongs to the Special Issue Applications of Thermofluids in Power Generation Systems)
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