Papers by Ferenc Friedler
Enabling technology models with nonlinearities in the synthesis of wastewater treatment networks based on the P-graph framework
Computers & Chemical Engineering
Optimization of vertical farms energy efficiency via multiperiodic graph-theoretical approach
Journal of Cleaner Production, Sep 1, 2023
Challenges and Potentials of Modelling Tools Total Site Integration and Utility System Optimisation
Computer-aided chemical engineering, 2017
Abstract Industrial sites are served by a common utility system. There have been developments in ... more Abstract Industrial sites are served by a common utility system. There have been developments in the site-wide heat recovery and cogeneration optimisation, for which several prominent software packages have been used as computing tools. This contribution provides an overview of the developments and the software packages, mapping the feature requirements of the methods to the tools. The extensive methodology developments pose serious flexibility requirements that can only be partially supported by the existing tools. There is a need for more flexible modelling tools allowing of the whole spectrum of site energy optimisation tasks – ranging from concepts and algorithms development, to specific case studies, consulting and industrial implementations.
DOAJ (DOAJ: Directory of Open Access Journals), Aug 1, 2010
The S-graph framework introduced by Sanmarti et al. (1998), originally developed for single proce... more The S-graph framework introduced by Sanmarti et al. (1998), originally developed for single processor, is proved to be an effective tool for batch process scheduling. The basic algorithm of the framework follows branch-and-bound strategy that provides an opportunity for parallelization. Nowadays, multi-core processors are available even in personal computers, thus, parallel algorithms become more important and useful in practice. Two types of parallel scheduling algorithms are introduced here. In the first one, each processor considers the entire search space, while in the second one, some processors perform a look-ahead strategy for sharpening the bound. The proposed algorithms are effective in practice, for some examples the so called super-linearity occurs, i.e., for n processor system, the running time can be less than the n-th fraction of the time required by a single processor.
Processing Systems Synthesis with Embedded Reliability Consideration
Computer-aided chemical engineering, 2018
Abstract Reliability is one of the most important properties of processing systems, still there i... more Abstract Reliability is one of the most important properties of processing systems, still there is no general method that is able to simultaneously considering the reliability during the design procedure. The proposed method is capable of synthesizing processing networks simultaneously taking into account reliability constraints or generating all Pareto optimal solutions for cost vs. reliability. The method is based on structural examinations and P-graph algorithms
Optimal design of multi-purpose batch chemical plants
Computers & Chemical Engineering, Apr 1, 1989
Abstract A new solution method has been developed for the optimal design of multi-purpose batch c... more Abstract A new solution method has been developed for the optimal design of multi-purpose batch chemical plants. The minimum capital investment cost serves for the optimality criterion. The algorithm is built upon two decomposition stages: a combinatorial step allowing the use of some heuristics and a nonlinear programming stage. A quasi-optimal solution is guarantied.
Synthesis technology for failure analysis and corrective actions in process systems engineering
Computer-aided chemical engineering, 2019
Abstract The ever increasing complexity of processing systems and the requirements to be satisfie... more Abstract The ever increasing complexity of processing systems and the requirements to be satisfied by the processes make process design and process operation more and more complex. Because of that, the reliability/availability is to be taken into account together with other requirements in process design/synthesis. Similarly, failure analysis is also an important part of process operation. In the current work, it has been shown that in addition to the widely used unit level redundancy, process level redundancy must also be considered in synthesizing a process for satisfying high level availability. Therefore, in case of failure, the determination of the best corrective action must be based on more general process networks than considered before. The proposed procedure determines the best or n-best corrective actions for the most general types of highly complex process networks, e.g., including process level redundancy. The P-graph based procedure is effective in generating corrective action suitable for industrial processes.
Environmental progress & sustainable energy, Feb 27, 2018
The design of sustainable manufacturing processes and supply chains is rapidly becoming a critica... more The design of sustainable manufacturing processes and supply chains is rapidly becoming a critical issue. The reason is the necessity of providing for the needs of a growing human population which is increasingly prosperous across the globe. To this purpose, this review article explores the most important elements of sustainability science and couples them with the P-graph framework, thereby rendering it possible to design feasible process and supply structures with great ease. Structure is an often-overlooked aspect of process and supply chain design, in part because even relative simple processes or supply chains can have an enormous number of feasible structures. We further illustrate the application of these ideas with examples of energy generation processes and supply chains. V
Energies
In this paper, a multi-objective optimization framework for electric motors and its validation is... more In this paper, a multi-objective optimization framework for electric motors and its validation is presented. This framework is suitable for the optimization of design variables of electric motors based on a predetermined driving strategy using MATLAB R2019b and Ansys Maxwell 2019 R3 software. The framework is capable of managing a wide range of objective functions due to its modular structure. The optimization can also be easily parallelized and enhanced with surrogate models to reduce the runtime. The framework is validated by manufacturing and measuring the optimized electric motor. The method’s applicability for solving electric motor design problems is demonstrated via the validation process. A test application is also presented, in which the operating points of a predetermined driving strategy provide the input for the optimization. The kriging surrogate model is used in the framework to reduce the runtime. The results of the optimization and the framework’s benefits and drawba...
Enabling in-depth analysis in heat exchanger network synthesis via graph-theoretic tool: Experiences in Swinburne University of Technology Sarawak Campus
Education for Chemical Engineers
Műszaki rendszerek modellezése és optimalizálása
DOAJ (DOAJ: Directory of Open Access Journals), Nov 15, 2021
In the tannery industry approximately, 30-35 m 3 of wastewater (WW) is generated per ton of rawhi... more In the tannery industry approximately, 30-35 m 3 of wastewater (WW) is generated per ton of rawhide processed. The WW comprises high concentrations of salts, ammonia, dye, solvents, and chromium. Of particular interest is chromium, which has been proven to cause dermatological, developmental, and reproductive issues on exposure. Thus, there is a need for appropriate treatment of the tannery WW before it is discharged for natural remediation. However, designing a treatment process is multifaceted due to the availability of multiple technologies that can perform similar tasks and the complex composition of waste streams. This necessitates the treatment to be performed in stages namely, primary, secondary, and tertiary. In some cases, pretreatment is required to enhance the recovery in the following stages. Due to the combinatorial nature of this problem, the P-graph approach, which uses principles from graph theory, can be used to synthesize a treatment pathway by selecting appropriate technologies at each stage, while meeting required purity specifications. Furthermore, the P-graph approach can provide alternate feasible treatment structures ranked based on Economics as well as Sustainability indicators, such as the Sustainable Process Index (SPI). In this work, a tannery WW case study is investigated with multiple stages and treatment technologies. A complex maximal structure is generated comprising all possible technologies, flows, connections, bypasses, mixers, and splitters. The models for each technology involve capital and operating costs, efficiency, and SPI at each stage of the treatment process. This problem is formulated in P-graph and solved using the Accelerated Branch-and-Bound algorithm.
Formal Proof of Algorithm ABB
P-graphs for Process Systems Engineering, 2022
Detection of Lethal Reactions for Identifying Antimicrobial Drug Targets
Adsorption is ubiquitous in the laboratory-scale as well as industrial-scale separation or purifi... more Adsorption is ubiquitous in the laboratory-scale as well as industrial-scale separation or purification of liquid and gaseous mixtures for the manufacture of a wide variety of chemicals, biochemicals and materials, e.g., fuel-grade ethanol by a biochemical route (1). Naturally, the potential of adopting adsorption for the same purpose in the biochemical production of butanol (B), ethanol (E), and acetone (A) has been well recognized (2-7). Apparently, however, no attempt has yet been made to incorporate adsorption into an industrial plant for the downstream processing in the biochemical production of B, E, and A. The current work explores the possibility of incorporating both adsorption and the conventional separation methods, including various types of distillation and extraction, into such a plant through synthesizing the potentially optimal and nearoptimal flowsheets for it. A comparative analysis is carried out among the resultant flowsheets as well as with those consisting only...
Chemical engineering transactions, 2015
a Department of Chemical and Environmental Engineering, Universidad Nacional de Colombia, Bogotá,... more a Department of Chemical and Environmental Engineering, Universidad Nacional de Colombia, Bogotá, Colombia b Department of Computer Science and Systems Technology, University of Pannonia, Veszprém, Egyetem u.10 H-8200, Hungary c Faculty of Information Technology, Pázmány Péter Catholic University, Práter u. 50/A, 1083 Budapest, Hungary d Department of Systems Engineering, Universitaria de Investigación y Desarrollo, Calle 9 No. 23-55, Bucaramanga Colombia e Department of Chemical Engineering, Kansas State University, 1005 Durland Hall, Manhattan, Kansas 66506, USA [email protected]
An Attempt for the Identification of Stoichiometrically Exact Mechanisms of the Catalytic Reduction of Nitrogen Dioxide(NO2) by Carbon Monoxide(CO) on Platinum Catalysts
An Attempt for the Identification of Stoichiometrically Exact Mechanisms of the Conversion of Glucose to Pyruvate
Chemical engineering transactions, 2018
The P-graph framework was originally developed to address Process Network Synthesis (PNS) problem... more The P-graph framework was originally developed to address Process Network Synthesis (PNS) problems in the preliminary design of chemical plants. P-graph provides a mathematically rigorous and computationally efficient framework for solving PNS problems via the maximal structure generation (MSG), solution structure generation (SSG) and accelerated branch-and-bound (ABB) algorithms. MSG ensures rigorous generation of the maximal structure, while the ad hoc generation of a superstructure as basis for a mathematical programming model can lead to significant modelling errors. In addition, SSG allows the generation of combinatorially feasible network structures that can be utilized for practical decision-making by designers. For very large problems, ABB can reduce the computational effort of reaching globally optimal solutions by multiple orders of magnitude compared to conventional branch-and-bound solvers for Mixed Integer Linear Programming (MILP) models. In addition to conventional PN...
Chemical engineering transactions, 2018
Systematically exploring candidate reaction pathways of chemical and biochemical reactions has bo... more Systematically exploring candidate reaction pathways of chemical and biochemical reactions has both theoretical and practical importance. For example, on the basis of the understanding of the mechanism of a complex reaction, its yield may be improved. For this reason many works cover issues on the synthesis of reaction pathways for a given reaction. One of the most effective approach is based on P-graph algorithm capable of generating all possible reaction pathways from the starting reactants (precursors) to final products (targets). This method produces the possible topological structures of the reaction based on dynamic equilibrium state, steady-state circumstances. It is, therefore, crucial to know whether these states can be reached from the initial state of the system, i.e., whether the reaction pathway is structurally startable. A novel algorithm is given in the present work that examines the reaction pathways in terms of structural startability. The algorithm has been demonst...
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Papers by Ferenc Friedler