Article
Thermodynamics
Ke Chen, Ming Pan
Summary: This paper introduces a novel superstructure CCHP system and uses deterministic modeling and optimization methods for CCHP operations, which outperforms traditional stochastic algorithms like Genetic Algorithm in adhering to demand constraints. Case studies demonstrate that the superstructure CCHP system achieves greater energy savings in large energy demand scenarios compared to single-structure CCHP systems.
Article
Energy & Fuels
Chao Zeng, Yanping Yuan, Fariborz Haghighat, Karthik Panchabikesan, Xiaoling Cao, Li Yang, Ziyu Leng
Summary: The study explores the cooling of an underground shelter using a geothermal heat pump system and water-phase change material tanks in ordinary and emergency modes. By optimizing parameters such as pipe length, tank matrix, and cooling water flow ratio using the Taguchi design method, a significant reduction in initial cost in the emergency mode was achieved.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Xuan Dong, Chijin Zhang, Xiaoyi Peng, Chenglin Chang, Zuwei Liao, Yao Yang, Jingyuan Sun, Jingdai Wang, Yongrong Yang
Summary: This paper introduces a novel super-structure to simultaneously design a heat integrated water allocation network (HIWAN), optimizing water and energy use. It proposes a small to large iteration strategy to find the best solutions for large-scale problems, achieving better results compared to previous papers.
Article
Thermodynamics
J. E. De Leon-Ruiz, I. Carvajal-Mariscal, M. Venegas, R. Beltran-Chacon, M. de la Cruz-Avila
Summary: This study introduces a concentric vertical pipe heat exchanger for indirect evaporative cooling in air conditioning systems operating in arid and semi-arid climates. The setup includes a heat pump cooler as a pre-cooler and predehumidifier of outdoor fresh air, reducing the cooling load on the evaporator. Through experimental analysis, it was found that the utilization of this setup resulted in a significant decrease in cooling load and required electrical input, along with reduced operation time and long-term economic savings.
APPLIED THERMAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Remo De Donno, Alessia Fracassi, Antonio Ghidoni, Alessandro Morelli, Gianmaria Noventa
Summary: This paper investigates the capabilities of a surrogate-based optimization technique for advanced design of centrifugal pumps, focusing on a pump designed for automotive cooling systems. The study includes a three-dimensional geometry parametrization method based on Bezier surfaces and utilizes software packages such as Scilab, Ansys-CFX, and DAKOTA for geometric parametrization, CFD simulations, and optimization management. The research considers an operative point typical of high-performance gasoline cars.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Civil
Ngandu Balekelayi, Kahsay N. Zeraebruk, Medhanie Teklemariam, Solomon Tesfamariam
Summary: The energy consumption of pumps is a major operational cost in water distribution systems, and defining better pump operation policies can reduce costs and improve service quality. The complexity of pump scheduling in large water distribution systems poses challenges for existing optimization algorithms, especially when faced with large search spaces and numerous possible alternatives. Existing methodologies for pump scheduling in large water distribution systems show limitations and suggest further techniques are needed to address these challenges.
JOURNAL OF PIPELINE SYSTEMS ENGINEERING AND PRACTICE
(2021)
Article
Thermodynamics
Keyan Ma, Mingsheng Liu, Jili Zhang
Summary: The paper proposes a heat transfer model for cooling towers and establishes an experimental system to evaluate its performance. The experimental results show high accuracy and adaptability of the model. A mathematical model for online optimization of cooling water systems is established based on the proposed model.
Article
Green & Sustainable Science & Technology
Mahdi Hashemi Beni, Milad Morad Bazofti, Babak Golkar, Yadollah Saboohi, Hamid Mokhtari, Bahar Milani
Summary: The aim of this paper is to provide a solution to decrease water consumption in the slab-cooling unit of Mobarakeh Steel Complex in Iran. The proposed solution includes modeling the transient heat transfer process, designing and optimizing a hybrid cooling system using Genetic Algorithm, and reducing water consumption by 88.3% annually.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Chemical
Joonjae Ryu, Christos T. Maravelias
Summary: The proposed distillation network synthesis model offers improved modeling capabilities, allowing for the allocation of multiple mixtures to different columns in the network while considering interactions. It can handle various products and streams, with considerations for stream bypass and thermal coupling to provide novel solutions that outperform conventional approaches.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Construction & Building Technology
Jiazheng Wang, Shuxue Xu, Guoyuan Ma, Qianqian Gou, Pu Zhao, Xiaoya Jia
Summary: This paper presents the design and application of a solar-driven heating and cooling system integrated with an air source heat pump for an ultra-low energy building. An emergy-based optimization method is used to obtain the optimal configuration of the compound parabolic concentrated-photovoltaic thermal collector, taking into account energy, social, environmental, and economic factors. The results show that the designed system consumes the lowest emergy when the photovoltaic coverage ratio is 1.0, leading to a 9.96% emergy savings compared to the reference system. The study also analyzes the emergy performance, monthly emergy performance, and the influence of investment cost and solar irradiation on the emergy performance of the system.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Energy & Fuels
Shichang Yun, Dalin Zhang, Xinyu Li, Xuanang He, Wenxi Tian, Suizheng Qiu, G. H. Su, Quanbin Zhao
Summary: In order to exploit the advantages of Fluoride-Salt-cooled high-Temperature Advanced Reactors (FuSTAR), an energy conversion system based on a closed Brayton cycle was optimized for best parameters and configuration. The findings show that incorporating reheating into the system greatly enhances thermal efficiency. For different gases, specific configurations such as recompression intercooling or the incorporation of reheating, recompression, and intercooling can significantly improve thermal efficiencies.
Article
Chemistry, Multidisciplinary
Saif H. Majeed, Amar S. Abdul-Zahra, Dheya G. Mutasher, Hayder A. Dhahd, Mohammed A. Fayad, Ali H. A. Al-Waeli, Hussein A. Kazem, Miqdam T. Chaichan, Ahmed A. Al-Amiery, Wan Nor Roslam Wan Isahak
Summary: In this study, a PVT system with an underground heat exchanger was used to achieve optimal performance and cooling for photovoltaic panels. The chosen site in Baghdad, Iraq had a stable soil temperature and the PVT system showed a significant increase in surface temperature and electrical efficiency compared to standalone PV. The results demonstrate the feasibility and acceptable efficiency of the proposed system in harsh weather conditions.
Article
Thermodynamics
Mengyuan Li, Chi Ma, Shuang Zeng, Jiarui Hu, Jialan Liu, Shilong Wang
Summary: The heat dissipation performance of the motorized spindle system is crucial for its dynamic accuracy. The traditional cooling water jacket with spiral and serpentine channels has limitations in meeting the increasing demand for heat dissipation and suffers from high flow resistance and uneven cooling temperature. To address these issues, a high-efficiency and strong-convergence structure design method is proposed based on multi-objective topology optimization to enhance heat dissipation and reduce pressure drop loss. A lightweight conjugate heat transfer equivalent model based on the Darcy model is constructed for the cooling water jacket, facilitating faster computation and improved convergence performance. The optimized topology structure of the cooling water jacket is validated using the Reynolds-averaged Navier-Stokes model. The results demonstrate reasonable agreement between the Darcy equivalent model and the Reynolds-averaged Navier-Stokes model. Additionally, the cooling water jacket with the optimized channel is embedded into the motorized spindle system and subjected to multi-physical field simulation, confirming its superior heat dissipation performance and lower pressure loss compared to the traditional spiral and serpentine channels. The proposed high-efficiency and strong-convergence structure design method is a feasible approach for obtaining effective topology structures for cooling water jackets and provides guidance for thermal design of motorized spindle systems.
APPLIED THERMAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Wanpeng Chen, Tao Tao, Aijiao Zhou, Lu Zhang, Lei Liao, Xumeng Wu, Kai Yang, Chenxiu Li, Tian C. Zhang, Zhi Li
Summary: The study established a general model for a simulated two-stage system and developed optimization strategies based on a dynamic-level-feedback-control approach. The cost- and energy-driven optimization strategies proposed in this study can significantly reduce operating energy costs and maintain system stability.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Energy & Fuels
Nidret Ibric, Elvis Ahmetovic, Andreja Nemet, Zdravko Kravanja, Ignacio E. Grossmann
Summary: This work presents the synthesis and modeling of heat-integrated water networks (HIWNs) using mathematical programming. The proposed model can effectively solve HIWN problems of different complexities, including large-scale problems.
Article
Chemistry, Physical
Giani de Vargas Briao, Meuris Gurgel Carlos da Silva, Melissa Gurgel Adeodato Vieira, Khim Hoong Chu
Summary: This paper evaluates three modified BET equations against the original BET equation in correlating adsorption isotherms of water contaminants, showing that the modified equations outperform the original one; the Aranovich-Donohue equation stands out as a promising model for accurately tracing the atypical curve shapes of reactive blue 5G and naphthenic acid isotherms.
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
(2022)
Article
Engineering, Chemical
Khim Hoong Chu, Jean Debord, Michel Harel, Jean-Claude Bollinger
Summary: This article discusses the correlation of experimental equilibrium data for the adsorption of water contaminants on solid surfaces using various isotherm expressions, and argues that four commonly used isotherms provide the same results when fitted to the data.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Review
Chemistry, Applied
Khim Hoong Chu
Summary: This article provides a specific review of modeling approaches for describing breakthrough curves of water contaminants and serves as a cautionary guide to common and persistent modeling misconceptions. It focuses on early career researchers in the field of adsorptive water remediation. The article discusses typical data- and mechanism-driven models, along with numerical fixed bed models and their various curve broadening mechanisms. It also highlights the use of analytical fixed bed models for linear and nonlinear trace systems. The article concludes with a summary of misconceptions associated with the use of phenomenological and empirical models to fit breakthrough curves.
SEPARATION AND PURIFICATION REVIEWS
(2023)
Article
Biotechnology & Applied Microbiology
Giani de Vargas Briao, Khim Hoong Chu
Summary: This paper explores the use of the Lambert W function to invert the loading-implicit isotherms of Elovich, Volmer, and Jossens to solve for adsorbed phase concentration as a function of liquid phase concentration. The practical implementation of the Lambert W function in Excel provides a novel method to fit loading-implicit isotherms to experimental data of water contaminants.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Murat Yilmaz, Mohd Ali Hashim, Khim Hoong Chu
Summary: This article examines the limitations of the widely used Brunauer-Emmett-Teller (BET) equation in fitting nonstandard type II isotherm data in adsorptive water remediation. It introduces the Aranovich-Donohue equation as a modified version of the BET equation and demonstrates its superior performance in accurately correlating anomalous isotherm data. The Aranovich-Donohue-Sips equation is also shown to effectively fit nonstandard type II isotherm data, highlighting its versatility in practical applications.
SEPARATION SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Chemical
Khim Hoong Chu, Mohd Ali Hashim
Summary: This study explores the feasibility of using normal and log-normal probability distributions to track asymmetric breakthrough curves in fixed bed columns. It finds that different probability distributions have different fitting effects for different adsorbates, and the log-normal distribution can describe asymmetric breakthrough curves more accurately.
CHEMICAL ENGINEERING COMMUNICATIONS
(2023)
Article
Engineering, Chemical
Jean Debord, Michel Harel, Jean-Claude Bollinger, Khim Hoong Chu
Summary: This work aims to refute the claim that the Elovich isotherm is significantly inferior to the Langmuir or Freundlich isotherm in correlating adsorption equilibrium data. The mistaken finding is a result of comparing linearized versions of the three isotherms based on different sets of transformed data. By discriminating isotherms based on untransformed data, the Elovich isotherm is shown to be highly competitive against the Langmuir or Freundlich isotherm. Furthermore, this work demonstrates how a modified form of the Elovich isotherm can be used to evaluate the energy distribution of heterogeneous surfaces.
CHEMICAL ENGINEERING SCIENCE
(2022)
Review
Engineering, Chemical
Ackmez Mudhoo, Khim Hoong Chu, Prasenjit Mondal
Summary: Attrition resistance is an important measure of mechanical strength in adsorbents used for aqueous adsorption. This review discusses the quantification of attrition resistance, variability in attrition loss among different adsorbents, and the implications of attrition on adsorption systems. Opportunities for further research are presented to enhance understanding of attrition in real-scale water purification.
Article
Chemistry, Multidisciplinary
Khim Hoong Chu, Mohd Ali Hashim, Ackmez Mudhoo, Jean Debord
Summary: The paper investigates the data fitting attributes of the exponential integral isotherm, finding that the Ruthven-virial isotherm accurately tracks experimental adsorption isotherms and combines the strengths of the Freundlich and Langmuir isotherms. It is comparable to the three-parameter Sips isotherm in data fitting performance.
Article
Engineering, Chemical
Khim Hoong Chu, Mohd Ali Hashim, Hadis Bashiri, Jean Debord, Michel Harel, Jean-Claude Bollinger
Summary: The FH isotherm, which was first introduced in the mid-2000s in the field of water contaminant adsorption, has gained significant attention in recent years, largely due to its coverage in review articles. This article highlights the incompatibility of the linear form of the FH isotherm with its original nonlinear version. The study shows that the linearized FH isotherm suffers from serious defects, including incorrect parameter estimates and the inability to plot standard isotherm curves. It is recommended to use the original form of the FH isotherm in data fitting to avoid publishing meaningless research. Additionally, the article presents a novel application of the FH isotherm to evaluate the energy distribution of heterogeneous adsorbents.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Physical
Khim Hoong Chu, Mohd Ali Hashim
Summary: The Harkins-Jura isotherm equation was initially developed for sigmoid or type II isotherms in gas-solid adsorption systems. However, it has been exclusively used for hyperbolic or type I isotherms in water contaminant adsorption since the mid-2000s. Compared to the well-established Langmuir and Freundlich equations, the Harkins-Jura isotherm is inferior in modeling type I adsorption data and performs poorly in modeling type II data. Its limited modeling power suggests that it is time to bid farewell to the mediocre Harkins-Jura isotherm.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Multidisciplinary
Giani de Vargas Briao, Mohd Ali Hashim, Khim Hoong Chu
Summary: The Sips isotherm equation, widely used for studying water contaminant adsorption, has some problematic application issues. Firstly, the linear version of the Sips equation promoted in several reviews is incorrect. Secondly, comparing the Sips and Langmuir-Freundlich equations is inappropriate as they are mathematically equivalent. Lastly, applying the Sips equation to type I isotherms, which are hyperbolic curves, is less valuable than using simpler models like the Langmuir and Freundlich equations. The Sips equation is more effectively applied to type V isotherms, which are sigmoid curves.
SEPARATION SCIENCE AND TECHNOLOGY
(2023)
Review
Engineering, Environmental
Hai Nguyen Tran, Jean-Claude Bollinger, Stefano Salvestrini, Khim Hoong Chu, Ruey-Shin Juang
Summary: The Radke-Prausnitz model, a three-parameter model belonging to the Langmuir-Freundlich-type equation, is analyzed in this study to promote its proper application in adsorption research. The correct expression, citation, and units of its parameters are provided. The model has important implications for understanding adsorption processes.
JOURNAL OF ENVIRONMENTAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Jean Debord, Khim Hoong Chu, Michel Harel, Stefano Salvestrini, Jean-Claude Bollinger
Summary: The name of Herbert Freundlich is associated with the relationship between adsorbed amount and concentration in solution. The Freundlich isotherm is considered as the model of choice for correlating experimental adsorption data. However, his 1907 paper was not widely cited until the early 2000s, and those citations were often incorrect. This paper identifies the historical developments of the Freundlich isotherm and discusses its theoretical points, along with suggesting future ideas for exploration.
Letter
Engineering, Environmental
Khim Hoong Chu, Mohd Ali Hashim
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.
