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Expansion cooling prospects for large scale applications

International Journal of Thermofluids 2023年 20卷

作者： Alami, Abdul Hai Alrashid, Rashid Mdallal, Ayman Yasin, Ahmad Ayoub, Mohamad Alasad, Shamma Aljaghoub, Haya Alashkar, Adnan Abdelkareem, Mohammad Ali Olabi, Abdul Ghani Orhan, Mehmet Department of Sustainable and Renewable Energy Engineering University of Sharjah P.O. Box 27272 Sharjah United Arab Emirates Sustainable Energy and Power Systems Research Centre RISE University of Sharjah P.O. Box 27272 Sharjah United Arab Emirates Department of Mechanical Engineering American University of Sharjah P.O. Box 26666 Sharjah United Arab Emirates Department of Mechatronics Engineering American University of Sharjah P.O. Box 26666 Sharjah United Arab Emirates Department of Industrial Engineering and Engineering Management University of Sharjah P.O. Box 27272 Sharjah United Arab Emirates Materials Science and Engineering PhD Program American University of Sharjah P.O. Box 26666 Sharjah United Arab Emirates Chemical Engineering Department Minia University Elminia Egypt Mechanical Engineering and Design School of Engineering and Applied Science Aston University Aston Triangle BirminghamB4 7ET United Kingdom

Air conditioning in general and cooling in particular are the biggest energy sinks among all electricity consumers. Mitigating energy needs of this sector by active or passive means is a necessity. This paper offers a comprehensive review of various cooling technologies for large scale applications and compares them in terms of economy, environmental footprint and most importantly, energy requirements. There is a main focus on the potential of using expansion cooling, which is defined in conjunction with cooling effects generated during the expansion process of a gas. The interest in such cooling technology stems from the double benefit of utilizing a large-scale compressed air energy storage (CAES) system that can also provide cooling via the expansion of air. This consequently manifests in reducing the electrical demand required for cooling applications. Such a concept is beneficial for hot climates, where most of the electrical demand is reserved for offsetting the cooling load. © 2023 The Author(s)

关键词： Compressed air energy storage

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Time Optimal Control for a Non-Linear Planar Vehicle Subject to Disturbances ⁎

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IFAC-PapersOnLine 2021年第20期54卷 611-616页

作者： Ayal Taitler Ilya Ioslovich Erez Karpas Per-Olof Gutman Technion Autonomous Systems Program Technion Israel Institute of Technology Haifa Israel Faculty of Civil and Environmental Engineering Technion Israel Institute of Technology Haifa Israel Faculty of Industrial Engineering and Management Technion Israel Institute of Technology Haifa Israel

The problem of an autonomous agent moving on a planar surface, such as an aerial drone or a small naval vessel can be treated as navigation between a series of points. While nominally the movement between each pair of points can be treated as a 1D projection of the movement on the vector connecting the two points, in the presence of arbitrary constant disturbance the full problem on a plane must be considered. The minimum-time optimal solution is now dependent on the value and direction of the disturbance, which naturally affects the completion of the movement task. In this work, we address the problem of minimum time movement on a 2D plane with quadratic drag, under norm state (velocity), and norm control (acceleration) constraints. The structure and properties of the optimal solution of this nonlinear problem are found and analyzed. The Pontryagin Maximum Principle (PMP) with control and state constraints is utilized. Simulations encouraging the results are presented and compared with those of the academic open-source optimal control solver Falcon.m.

关键词： Optimal control Minimum time Maximum principle Bounded disturbances

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Time-Energy Optimal Control of a Non-Linear Surface Vehicle Subject to Disturbances ⁎

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IFAC-PapersOnLine 2021年第14期54卷 48-53页

The problem of a planar vehicle moving on a surface, such as an aerial drone or small naval vessel can be treated as series of trajectory planning problems between way-points. While nominally the movement between each two four dimensional points (positions and velocities) can be treated as an 1D projection of the movement on the vector connecting the two points, in the presence of arbitrary disturbance, the full problem on a plane must be considered. The combined minimum-time-energy optimal solution is now dependent on the value and direction of the disturbance, which naturally affects the structure and completion of the movement task. In this work, we address the minimum time-energy problem of a movement on a 2D plane with quadratic drag, under norm state (velocity), and norm control (acceleration) constraints. The structure and properties of the optimal solution are found and analyzed. The Pontryagin Maximum Principle (PMP) with control and state constraints is utilized. Simulations supporting the results are provided and compared with those of the open-source academic optimal control solver Falcon.m .

关键词： Optimal control Minimum time Maximum principle Bounded disturbances

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Preprocessing Techniques for Enhancing Vision-Based Detection System for Tire Sidewall Extraction

Preprocessing Techniques for Enhancing Vision-Based Detectio...

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International Seminar on Research of Information Technology and Intelligent systems (ISRITI)

作者： Jia Hao Loo Veronica Lestari Jauw Chin Seong Lim Khairul-Rijal Sarmin Nunung Nurul Qomariyah Ahmad Nurul Fajar Department of Mechanical Materials and Manufacturing Engineering University of Nottingham Malaysia Malaysia Continental Tyre Technology Centre Malaysia Petaling Jaya Malaysia Computer Science Department School of Computing and Creative Arts Bina Nusantara University Jakarta Indonesia Information System Management Department BINUS Graduate Program-Master Information Systems Bina Nusantara University Jakarta Indonesia

ISBN: (数字)9798331519643

ISBN: (纸本)9798331519650

This study aims to develop a system for extracting crucial information from tire sidewalls using Optical Character Recognition (OCR). Initially, images of tire were captured manually by smartphone cameras, including Redmi 9T, iPhone 11, and Galaxy S23 Ultra. The captured images are then transferred to a computer for storage. Subsequently, these images were cropped according to the boundaries identified by Hough Circle Transform (HCT). The cropped images were then further pre-processed. During the pre-processing phase, geometrical transformation and image sharpening techniques are applied to enhance the clarity and readability of the text images. The text is then extracted using Google Vision, with the extracted text categorized by size, DOT, brand and pattern. The results indicated that the effectiveness of image pre-processing was constrained by the accuracy of circle detection, which reached a maximum rate of 87.1%. This causes parts of the text to be cut out inaccurately, leading to a suboptimal extraction accuracy of 55.65%. It is also observed that the Redmi 9T camera produced inconsistent results compared to other devices. Specifically, the iPhone 11 and Samsung Galaxy S23 Ultra demonstrated superior extraction accuracies of 69.71% and 66.37%, respectively, whereas the Redmi 9T achieved a lower extraction accuracy of 37.76%.

关键词： Accuracy Optical character recognition Text categorization Lighting Transforms US Department of Transportation Cameras Tires Internet Data mining

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Analysis of Maturity Level of the management System in Hotel Sector Companies

Analysis of Maturity Level of the Management System in Hotel...

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International Conference on Tourism, Technology and systems, ICOTTS 2020

作者： Muñoz, Alexander Parody Lara, Malory Beatriz Guerra Lopesierra, Wilfrido Montes Morales, Bulmaro Fuentes Santana, Miguel Industrial Engineering Program Universidad Libre Seccional Barranquilla Barranquilla Colombia Master in Integrated Management Systems Bogota Colombia Universidad de La Guajira Riohacha La Guajira Colombia PhD in Information Technology Integration in Organizations Barranquilla Colombia Universidad de La Costa Barranquilla Colombia

ISBN: (纸本)9789813342590

The main purpose of this research is to evaluate the impact of maturity in quality management systems on assets, income and current ratio in companies of the hotel sector in the city of Barranquilla and its metropolitan area, based on the analysis of the level of maturity of the system and the application of multivariate statistical models. To achieve this, the Business management strategies of this sector were characterized, based on a structured model of variables and based on field data referring to a representative sample of companies in the sector (n = 64). With this information, the determining factors in the level of maturity of the quality management systems were identified, which allowed to know if the processes developed in a management system, such as these, in the Hotel Sector, impact positively or negatively on the performance of the sector’s companies based on assets, income and the current ratio by means of a multiple regression model, since, although these processes are being implemented, there are no current studies that evidence the contributions to the performance of the sector’s companies. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Quality control

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Water management and conductivity studies in novel polymer zirconium-based membranes for PEM fuel cells

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Case Studies in Chemical and Environmental engineering 2025年 11.0卷

作者： Ahmed, Tallah Magdi Al Othman, Amani Shamayleh, Abdulrahim Tawalbeh, Muhammad Engineering Systems Management Graduate Program American University of Sharjah PO. Box 26666 Sharjah United Arab Emirates Department of Chemical and Biological Engineering American University of Sharjah PO. Box 26666 Sharjah United Arab Emirates Energy Water and Sustainable Environment Research Center American University of Sharjah PO. Box 26666 Sharjah United Arab Emirates Department of Industrial Engineering American University of Sharjah PO. Box 26666 Sharjah United Arab Emirates Sustainable and Renewable Energy Engineering Department University of Sharjah PO. Box 27272 Sharjah United Arab Emirates Sustainable Energy & Power Systems Research Centre RISE University of Sharjah P.O. Box 27272 Sharjah United Arab Emirates

Proton exchange membrane fuel cells (PEMFCs) are among the promising alternatives for clean energy generation, especially when hydrogen is the fuel used. Their operation is still faced with several challenges, and one of them is water accumulation in the cathode compartment. If PEMFCs are operated at temperatures above the boiling point of water, a significant obstacle would be eliminated due to the formation of water in the vapor phase. This prevents water from accumulating in the liquid phase which causes flooding. Therefore, this work aims to develop a novel composite membrane based on zirconium silicate (ZrSiO₄) and Polyvinylidene fluoride (PVDF) for such high-temperature operation. The composite membrane was synthesized using solution casting, and its structural and chemical properties were characterized using thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM) techniques. The ZrSiO₄/PVDF membrane demonstrated a maximum proton conductivity of 2.14 × 10⁻³ S/cm at room temperature with 8 wt% ZrSiO₄, along with a water uptake value of 43.85 %. Consequently, when tested above the boiling point of water, the membrane exhibited a high conductivity of 2.13 × 10⁻³ S/cm at 105 °C. The results suggest the suitability of such zirconium silicate-based composite membranes for fuel cell applications operating above the boiling point of water. © 2024 The Author(s)

关键词： Composite membranes PEM fuel cells Proton conduction PVDF Water management Zirconium silicate

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Use of multicriteria decision aid methods in the context of sustainable innovations: bibliometrics, applications and trends

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Environment systems and Decisions 2021年第4期41卷 501-522页

作者： Delesposte, Jamile Eleutério Rangel, Luís Alberto Duncan Meiriño, Marcelo Jasmim Narcizo, Ramon Baptista Alencar Junior, André Armando Mendonça de Doctoral Program in Sustainable Management Systems Federal Fluminense University Niterói Rio de Janeiro Brazil Volta Redonda School of Industrial Metallurgical Engineering Federal Fluminense University Volta Redonda Rio de Janeiro Brazil Institute of Science and Technology Federal Fluminense University Rio das Ostras Rio de Janeiro Brazil

Sustainable innovation has gained prominence in recent years, due to the demands imposed by global competition, social pressures and the needs of consumers and the environment. Decision-making processes about sustainable innovation are complex and often require auxiliary instruments to reduce uncertainties. Multicriteria decision aid (MCDA) methods can be a useful tool to make these kinds of decisions more assertive. This article presents the main discussions and theoretical approaches through bibliometrics on the application of MCDA methods in the context of sustainable innovations. We used the R package Bibliometrix library to organize the data of the publications and perform the processing for the generated analyzes. The bibliometric analysis provided an overview about the use of MCDA in sustainable innovations (MIS) and it presents citation analysis;identification of central authors through co-citation analysis;main topics, conceptual structure and thematic evolution of the literature by co-word analysis. As main results, we identified the main trends in MIS: there has been a substantial increase in publications on this theme, and the most explored focuses are “product development, production and distribution” and “environmental or social impact assessment” and there is an opportunity to further explore the focuses of “evaluation or selection of projects, suppliers or resources”, “product life cycle management or assessment” and “definition of decision criteria and standards for sustainable innovation performance”. In addition, several MCDA tools have been successfully used for studies of sustainable innovations, demonstrating that there is no preferable method to use for a given focus. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

关键词： Bibliometric research Bibliometrix Innovation sustainable Multicriteria decision aid (MCDA)

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A novel strong duality-based reformulation for trilevel infrastructure models in energy systems development

arXiv

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arXiv 2023年

作者： Herrala, Olli Gabriel, Steven A. Oliveira, Fabricio Ekholm, Tommi Aalto University Department of Mathematics and Systems Analysis Espoo Finland University of Maryland Department of Mechanical Engineering/Applied Mathematics Statistics & Scientific Computing Program College ParkMD United States Norwegian University of Science and Technology Department of Industrial Economics and Technology Management Trondheim Norway Finnish Meteorological Institute Helsinki Finland

We explore the class of trilevel equilibrium problems with a focus on energy-environmental applications and present a novel single-level reformulation for such problems, based on strong duality. To the best of our knowledge, only one alternative single-level reformulation for trilevel problems exists. This reformulation uses a representation of the bottom-level solution set, whereas we propose a reformulation based on strong duality. Our novel reformulation is compared to this existing formulation, discussing both model sizes and computational performance. In particular, we apply this trilevel framework to a power market model, exploring the possibilities of an international policymaker in reducing emissions of the system. Using the proposed methods, we are able to obtain globally optimal solutions for a five-node case study representing the Nordic countries and assess the impact of a carbon tax on the electricity production portfolio. Copyright © 2023, The Authors. All rights reserved.

关键词： Energy resources

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Reconciling regional nitrogen boundaries with global food security (Sep, 10.1038/s43016-021-00366-x, 2021)

NATURE FOOD

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NATURE FOOD 2022年第5期3卷 385-385页

作者： Chang, Jinfeng Havlik, Petr Leclere, David de Vries, Wim Valin, Hugo Deppermann, Andre Hasegawa, Tomoko Obersteiner, Michael College of Environmental and Resource Sciences Zhejiang University Hangzhou China Ecosystems Services and Management Program (ESM) International Institute for Applied Systems Analysis (IIASA) Laxenburg Austria Environmental Systems Analysis Group Wageningen University and Research Wageningen the Netherlands College of Science and Engineering Ritsumeikan University Shiga Japan

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Industrial heritage restoration/renovation projects and their societal impacts: Case of Gasholder Restoration Projects

Societal Impacts

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Societal Impacts 2024年 3卷

作者： Gürkan Emre Gürcanlı Timo Hartmann Maxat Nurkaliyev Mert Özgür Istanbul Technical University Faculty of Civil Engineering Department of Civil Engineering Istanbul Turkey Technische Universität Berlin Institute for Civil Engineering Civil Systems Engineering Department Berlin Germany Istanbul Technical University Construction Projects Management Program Istanbul Turkey

The refurbishment of industrial heritage structures offers economic benefits and provides future generations with an insight into the industrial history of cities. However, industrial heritage projects possess unique attributes and risks, and the procedures for restoring, renovating, and converting these structures differ from those of other construction projects and their impacts to society. From the view of Social Impact management, ISO 45001, ISO 14001, ISO/DIS 14001 and similar standards directly related with the sustainability. However, the design and method of construction are also important not only for workers’ safety but also public health and safety. For a holistic view Building Information Modeling provides us to gather information to reduce these concerns. This short communication covers societal impacts of a recently completed project in Germany that titled as Building Information Modeling (BIM) based sustainability, facility management and design for safety of industrial heritage buildings restoration/renovation projects and tries to put forward health and safety risks of Gasholder Restoration Projects to workers as well as to public during the project and after the completion by the aid of on site observations and expert panel discussions.

关键词： Industrial heritage restoration Health and safety in construction Social Impacts of Restoration Projects Building Information Modeling

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