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Processes
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Advances in Process Optimization and Control
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Advances in Process Optimization and Control

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Process Control and Monitoring".

Deadline for manuscript submissions: closed (31 July 2023) | Viewed by 972

Special Issue Editors

Prof. Dr. Anatoly Tsirlin

E-Mail Website
Guest Editor
Ailamazyan Program Systems Institute of Russian Academy of Sciences, 152020 Pereslavl Zalessky, Russia
Interests: optimal control theory; optimum conditions for averaged problems; finite-time thermodynamics; thermodynamic approach in economic systems analysis; control of macrosystems
Prof. Dr. Lingen Chen

E-Mail Website
Guest Editor
Institute of Thermal Science and Power Engineering, Wuhan Institute of Technology, Wuhan 430205, China
Interests: finite-time thermodynamics; constructal theory; heat transfer; mass transfer; chemical reaction; constructal theromodynamic optimization

Special Issue Information

Dear Colleagues,

Optimization and process control methods each have their own distinguishing characteristics. They are associated with the instability of external conditions (composition of raw materials, performance requirements, changing dynamic properties of objects, etc.). Therefore, solutions must be “robust”. For many processes (heat transfer, separation, chemical reactors), thermodynamic irreversibility plays an important role when the optimal solution minimizes the production of entropy. The linearized dynamics is the same in most cases, and is described by aperiodic links and pure delay, which makes recommendations for choosing stabilizing controllers quite general.

Prof. Dr. Anatoly Tsirlin
Prof. Dr. Lingen Chen
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. Processes 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 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

  • optimal control
  • heat transfer
  • mass transfer
  • separation
  • chemical reaction
  • finite-time thermodynamics
  • dynamic optimization

Published Papers (2 papers)

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Research

17 pages, 7825 KiB  
Article
Thermal-Hydraulic Characteristics of Carbon Dioxide in Printed Circuit Heat Exchangers with Staggered Airfoil Fins
by Kun Xi, Xiang Zhao, Zhihui Xie, Fankai Meng, Zhuoqun Lu and Xiangkun Ji
Processes 2023, 11(8), 2244; https://doi.org/10.3390/pr11082244 - 26 Jul 2023
Cited by 1 | Viewed by 781
Abstract
Airfoil fin printed circuit heat exchangers (PCHEs) have broad application prospects in the naval, aerospace, electric power, and petrochemical industries. The channel structure is a critical factor affecting their thermal-hydraulic characteristics. In this study, a novel PCHE channel structure with staggered NACA 0025 [...] Read more.
Airfoil fin printed circuit heat exchangers (PCHEs) have broad application prospects in the naval, aerospace, electric power, and petrochemical industries. The channel structure is a critical factor affecting their thermal-hydraulic characteristics. In this study, a novel PCHE channel structure with staggered NACA 0025 airfoil-shaped fins was proposed; accordingly, the thermal-hydraulic characteristics of the novel channel structure using carbon dioxide as the working fluid at different fin heights under different operating conditions (trans-, near-, and far-critical) were investigated. The results indicated that the thermal-hydraulic performance of the PCHE under the trans-critical operating condition was better than that under the near-critical and far-critical operating conditions. Compared with conventional airfoil fin channels, the novel airfoil fin channel attained comparable comprehensive performance while reducing the fin volume by 50%, thus achieving a more lightweight PCHE design. The comprehensive performance of the PCHE was the poorest when the fin height was slightly below the channel height, which should be avoided during the design of airfoil fin PCHEs. The results provide theoretical support for the design and optimization of airfoil fin PCHEs. Full article
(This article belongs to the Special Issue Advances in Process Optimization and Control)
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15 pages, 758 KiB  
Article
Optimal Control of Technological Processes
by Anatoliy M. Tsirlin and Alexander I. Balunov
Processes 2023, 11(6), 1835; https://doi.org/10.3390/pr11061835 - 16 Jun 2023
Viewed by 828
Abstract
The paper formulates conditions under which the roots closest to the imaginary axis (critical roots) of the characteristic equation of a linearized system are real for the maximum possible degree of stability of the closed-loop control system of a technological process with pure [...] Read more.
The paper formulates conditions under which the roots closest to the imaginary axis (critical roots) of the characteristic equation of a linearized system are real for the maximum possible degree of stability of the closed-loop control system of a technological process with pure delay. For the parameters of the controllers corresponding to the maximum degree of stability, these roots are multiples. Their multiplicity order is one more than the number of coefficients in the transfer function of the controller. It is demonstrated that for a typical technological control object, these conditions are satisfied for all “serial” control laws. This allowed for obtaining analytical expressions for optimal settings and limiting degrees of stability as functions of object parameters for typical dynamic characteristics of technological processes. The paper considers the problem of robust stability for control systems with an object containing pure delay. It has been proven that in the maximum stability problem, the operations of maximizing over controller parameters and minimizing over the set of possible object parameters can be interchanged. Therefore, selecting robust settings amounts to determining the minimum of the maximum stability over the set of possible object parameter values. Controllers with such settings are suitable, without modification, for a whole class of technological processes. Full article
(This article belongs to the Special Issue Advances in Process Optimization and Control)
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