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COMPARISON OF 1-D EJECTOR MODELLING APPROACH AND COMPUTATIONAL FLUID DYNAMICS (CFD) SIMULATION TO PREDICT THE PERFORMANCE OF EJECTOR DEVICES 37

COMPARISON OF 1-D EJECTOR MODELLING APPROACH AND COMPUTATION...

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37th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of energy Systems, ECOS 2024

作者： Karkalos, Nikolaos E. Braimakis, Konstantinos Markopoulos, Angelos P. Leontaritis, Aris-Dimitrios Karellas, Sotirios Laboratory of Thermal Processes School of Mechanical Engineering National Technical University of Athens Athens Greece Laboratory of Refrigeration Air-Conditioning & Solar Energy School of Mechanical Engineering National Technical University of Athens Athens Greece Laboratory of Manufacturing Technology School of Mechanical Engineering National Technical University of Athens Athens Greece

ISBN: (纸本)9798331307660

The goal of the present work is to perform a comparison of the numerical simulation results obtained by a 1-D model and CFD-based 2-D models regarding the preliminary study of the operation and performance of an ejector device used in an ejector cooling cycle (ECC) which is a part of a trigeneration prototype intended for vessel engine waste heat recovery (WHR), being developed in the context of the ZHENIT H2020 project. While 1-D ejector models have been demonstrated to accurately predict their performance for particular cases and can be used in the calculation of main ejector dimensions, they employ simplifying assumptions and often involve the use of empirical correlations, the validity of which is restricted to specific working fluids and operating conditions. Furthermore, 1-D models do not take into account a large number of secondary but important ejector geometric parameters. Therefore, in the case that experimental data are not directly available, cross validation of their results with those obtained through the use of more sophisticated CFD-based approaches can provide a valuable tool for the evaluation of their accuracy. The ECC which provides the basis for the investigated ejector geometry operates with working fluid R1233zd(E). According to the nominal operating conditions, the primary flow enters the ejector inlet at relatively high temperature of 130℃(5 K superheating) and is used for the entrainment of low-pressure vapor leaving the cooling evaporator at 12℃ (5 K superheating).Two ejector geometries are evaluated, featuring different nozzle exit position (NXP) values. The comparative assessment of the two modelling approaches reveals that there are substantial deviations between their outcome, especially regarding the secondary inlet mass flow rate and ejector entrainment ratio, suggesting that necessary adjustments are required for the 1-D model to provide accurate results under the investigated conditions. © 2024 37th International Conference on Eff

关键词： Waste heat

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Forestvoltaics,Floatovoltaics and Building Applied Photovoltaics(BAPV)Potential for a University Campus

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energy engineering 2024年第9期121卷 2331-2361页

作者： Rittick Maity Muhammad Khairul Imran bin Ahmad Shuhaimi Kumarasamy Sudhakar Amir Abdul Razak Faculty of Electrical and Electronics Engineering Technology Universiti Malaysia Pahang Al-Sultan AbdullahPekan26600Malaysia Centre for Research in Advanced Fluid and Processes UniversitiMalaysia Pahang Al-Sultan AbdullahGambang26300Malaysia Faculty of Mechanical and Automotive Engineering Technology Universiti Malaysia Pahang Al-Sultan AbdullahPekan26600Malaysia Centre for Automotive Engineering Universiti Malaysia Pahang Al-Sultan AbdullahPekan26600Malaysia Energy Centre Maulana Azad National Institute of TechnologyBhopal462003India

The United Nations’Sustainable Development Goals(SDGs)highlight the importance of affordable and clean energy *** energy is a perfect example,being both renewable and *** popularity shows no signs of slowing down,with solar photovoltaic(PV)panels being the primary technology for converting sunlight into *** are continuously being made to ensure cost-effectiveness,high-performing cells,extended lifespans,and minimal maintenance *** study focuses on identifying suitable locations for implementing solar PVsystems at theUniversityMalaysia PahangAl SultanAbdullah(UMPSA),Pekan campus including buildings,water bodies,and forest areas.A combined technical and economic analysis is conducted using Helioscope for simulations and the Photovoltaic Geographic Information System(PVGIS)for economic *** simulation examine case studies for PV installations in forested areas,lakes,and *** approach provides comprehensive estimations of solar photovoltaic potential,annual cost savings,electricity costs,and greenhouse gas emission *** on land coverage percentages,Floatovoltaics have a large solar PV capacity of 32.3 Megawatts(MW);forest-based photovoltaics(Forestvoltaics)achieve maximum yearly savings of RM 37,268,550;and Building Applied Photovoltaics(BAPV)have the lowest CO2 emissions and net carbon dioxide reduction compared to other plant *** also clarifies the purpose of using both software tools to achieve a comprehensive understanding of both technical and economic aspects.

关键词： Helioscope solar photovoltaic PV GIS performance land coverage economics

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Experimental Study on a Hybrid Battery Thermal Management System Combining Oscillating Heat Pipe and Liquid Cooling

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Frontiers in Heat and Mass Transfer 2025年第1期23卷 299-324页

作者： Hongkun Lu M.M.Noor K.Kadirgama School of Automotive Engineering Jiangxi Polytechnic UniversityJiujiang332000China Faculty of Mechanical and Automotive Engineering Technology Universiti Malaysia Pahang Al-Sultan Abdul-lahPekan26600Malaysia Centre for Research in Advanced Fluid&Processes Universiti Malaysia Pahang Al-Sultan Abdul-lahPekan26600Malaysia Institute of Sustainable and Renewable Energy(ISuRE) Universiti Malaysia Sarawak(UNIMAS)Kota Samarahan94300Malaysia

To improve the thermal performance and temperature uniformity of battery pack,this paper presents a novel battery thermal management system(BTMS)that integrates oscillating heat pipe(OHP)technology with liquid *** primary innovation of the new hybrid BTMS lies in the use of an OHP with vertically arranged evaporator and condenser,enabling dual heat transfer pathways through liquid cooling plate and *** study experimentally investigates the performance characteristics of the⊥-shaped OHP and hybrid *** show that lower filling ratios significantly enhance the OHP’s startup performance but reduce operational stability,with optimal performance achieved at a 26.1%filling ***,as a single working fluid,exhibited superior heat transfer performance under low-load conditions compared to mixed fluids,while the acetone/ethanol mixture,forming a non-azeotropic solution,minimized temperature *** 100 W,the⊥-shaped OHP with a horizontally arranged evaporator demonstrated better heat transfer performance than 2D-OHP *** to a liquid BTMS using water coolant at 280 W,the hybrid BTMS reduced the equivalent thermal resistance(RBTMS)and maximum temperature difference(ΔTmax)by 8.06%and 19.1%,*** graphene nanofluid was used as the coolant in hybrid BTMS,the battery pack’s average temperature(Tb)dropped from 52.2℃ to 47.9℃,with RBTMS andΔTmax decreasing by 20.1%and 32.7%,*** findings underscore the hybrid BTMS’s suitability for high heat load applications,offering a promising solution for electric vehicle thermal management.

关键词： Battery thermal management system oscillating heat pipe liquid cooling hybrid BTMS graphene nanofluid

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An investigation of induced free-surface wave oscillations in prismatic open-channel

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ISH Journal of Hydraulic engineering 2023年第5期29卷 701-706页

作者： Mnassri, Souad Triki, Ali Research Unit: Mechanics. Modelling Energy and Materials M2EM Department of Mechanical Engineering National Engineering School of Gabès University of Gabès Tunisia Ph.D. Research Unit: Advanced materials Applied mechanics Innovative processes and Environment 2MPE Higher Institute of Applied Sciences and Technology of Gabès University of Gabès Tunisia

This paper reported on the free-surface wave behavior in a rectangular open-channel, induced by sluice-gate maneuvers. Numerical computations used the McCormack scheme to solve the one-dimensional extended St-Venant model embedding the Prandtl power-law momentum correction coefficient. The fundamental pulsation of the hydraulic system was inspected using the analogy with the water-hammer theory, known in pressurized-pipe flows. Different flow scenarios were reported;including the superposition between (i) downstream water-hammer maneuver and sine excitation of upstream flow depth and (ii) sinusoidal fluctuations of upstream lateral inflow and downstream flow-depth. Results highlighted that such sluice-gates maneuvers involved severe scenarios leading to significant amplifications of the depth peak and crest values above the initial value. © 2022 Indian Society for Hydraulics.

关键词： Rivers

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Global scale solar energy harnessing: An advanced intra-hourly diffuse solar irradiance predicting framework for solar energy projects

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Neural Computing and Applications 2024年第18期36卷 10585-10598页

作者： El-kenawy, El-Sayed M. Bailek, Nadjem Bouchouicha, Kada Zerouali, Bilel Hassan, Muhammed A. Kuriqi, Alban Jamil, Basharat Colak, Ilhami Khalil, Adel Ibrahim, Abdelhameed Department of Communications and Electronics Delta Higher Institute of Engineering and Technology Mansoura35111 Egypt Laboratory of Mathematics Modeling and Applications Department of Mathematics and Computer Science Faculty of Sciences and Technology Ahmed Draia University of Adrar Adrar01000 Algeria Energies and Materials Research Laboratory Faculty of Sciences and Technology University of Tamanghasset Tamanrasset10034 Algeria MEU Research Unit Middle East University Amman Jordan Adrar01000 Algeria Vegetal Chemistry-Water-Energy Laboratory Faculty of Civil Engineering and Architecture Department of Hydraulic Hassiba Benbouali University of Chlef Ouled Fares Chlef02180 Algeria Mechanical Power Engineering Department Faculty of Engineering Cairo University Giza12613 Egypt School of Architecture University of Waterloo 7 Melville St S CambridgeONN1S 2H4 Canada CERIS Instituto Superior Tecnico Universidade de Lisboa Lisbon Portugal Civil Engineering Department University for Business and Technology PristinaKosovo10000 High Temperature Processes Unit IMDEA Energy Institute Av. Ramón de La Sagra 3 Móstoles Madrid28935 Spain Faculty of Engineering and Architectures Nisantasi University Istanbul Turkey Computer Engineering and Control Systems Department Faculty of Engineering Mansoura University Mansoura35516 Egypt

Diffuse horizontal irradiance (DHI) forecasts are critical for adopting solar photovoltaic technology. Yet, they can lack reliability given the limited and uncertain meteorological data available for desert areas. This research develops a new sine cosine dipper throated optimization (SCDTO) technique, targeting DHI prediction even given such data constraints. SCDTO uniquely hybridizes sine cosine metaheuristics, adept at exploration, with dipper throat optimization, providing focused exploitation. This hybridization aims to create a robust ensemble model capable of delivering reliable DHI predictions despite climatic uncertainty. The ensemble model, employing various input combinations, was rigorously evaluated across multiple meteorological stations. The SCDTO algorithm exhibited remarkable performance improvements, yielding substantial reductions exceeding 93% in root mean squared error and 98% in mean absolute error at key stations in Morocco, including Tan-Tan, Zagora, Erfoud, and Oujda. Comparative analyses against established optimization algorithms consistently underscored the superior predictive capabilities of SCDTO. Visualizations, including box plots and histograms, demonstrated SCDTO’s efficacy in minimizing prediction errors, particularly for Tan-Tan, Zagora, and Erfoud stations. Also, statistical validation through one-way analysis of variance (ANOVA) further affirmed the significance of the proposed SCDTO method. Therefore, this hybrid metaheuristic optimization enables more accurate DHI predictions from limited meteorological data. © The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature 2024.

关键词： Solar energy

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Variational Approach for Tempered Fractional Sturm–Liouville Problem

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International Journal of Applied and Computational Mathematics 2021年第2期7卷 1-17页

作者： Pandey, Prashant K. Pandey, Rajesh K. Yadav, Swati Agrawal, Om P. Department of Mathematical Sciences Indian Institute of Technology (BHU) Varanasi Varanasi 221005 UP India Mechanical Engineering and Energy Processes Southern Illinois University Carbondale 62901 IL United States

In this paper, we study the properties of eigenvalue for the regular tempered fractional Sturm–Liouville problem (TFSLP) of order μ. Using a fractional variational approach, we show that the set of eigenvalues for TFSLP are infinite, and correspond to unique eigenfunctions. We establish that the eigenvalues of the problem are distinct, and the corresponding eigenfunctions are orthogonal to each other. We also show that the minimum value of the functional corresponding to TFSLP is the lowest eigenvalue. © 2021, The Author(s), under exclusive licence to Springer Nature India Private Limited.

关键词： Tempered fractional calculus Tempered fractional Sturm–Liouville problem Tempered fractional variational calculus

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Experimental and numerical analysis of the rail with the heat control valves 16

Experimental and numerical analysis of the rail with the hea...

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16th International Scientific and engineering Conference Hermetic Sealing, Vibration Reliability and Ecological Safety of Pump and Compressor Machinery, HERVICON+PUMPS 2020

作者： Romanik, G. Rogula, J. Machalski, A. Wroclaw University of Science and Technology Faculty of Mechanical and Power Engineering Department of Mechanics Machines Devices and Energy Processes ul. Wybrzeze Wyspianskiego 27 Wroclaw50-370 Poland

The article presents the results of experimental and numerical tests of a surface heating flow control system consisting of a distribution rail along with the fixed valves set. The flow rates of single and parallel installed valves were measured, their three-dimensional models were prepared and used to make a flow models. The coefficient of kv is computed for a single valve on the rail and for the set of valves. In a flow model geometry the measurements of the test stand elements were considered in order to compare the results. The influence of the addition of the valves to the rail on the flow rate distribution was determined. © Published under licence by IOP Publishing Ltd.

关键词： Condensed matter physics

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Tuning dual three-dimensional porous copper/graphite composite to achieve diversified utilization of copper current collector for lithium storage

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Rare Metals 2021年第10期40卷 2802-2809页

作者： Xia Ma Zhi-Jia Zhang Jia-Min Wang Shi-Hao Sun Shao-Fei Zhang Shen Yuan Zhi-Jun Qiao Zhen-Yang Yu Jian-Li Kang Wei-Jie Li State Key Laboratory of Separation Membrane and Membrane Processes Tianjin Municipal Key Laboratory of Advanced Fibers and Energy StorageSchool of Materials Science and EngineeringSchool of Mechanical EngineeringTiangong UniversityTianjin 300387China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China School of Materials Science and Engineering Hebei Key Laboratory of Material Near-Net Forming TechnologyHebei University of Science&TechnologyShijiazhuang 050018China Institute for Superconducting and Electronic Materials University of WollongongWollongongNSW 2522Australia

Graphite anode materials are widely used in commercial lithium-ion batteries;however, the long electron/ion transportation path restricted its high energy storage. In this experiment, we designed a copper/graphite composite with a dual three-dimensional(3 D) continuous porous structure combining used nonsolvent-induced phase separation and heat treatment, in which a large amount of graphite is embedded in the 3 D porous copper/carbon architecture. In the novel structure, not only the electron and Li^(+) transmission performances are improved, but also the space of current collector is fully utilized. Meanwhile,carbonized polyacrylonitrile network stabilizes the interface between graphite and copper matrix. The obtained copper/graphite composite anode has an initial discharge capacity of 524.6 mAh·g^(-1), a holding capacity of350 mAh·g^(-1) and excellent cycle stability(299.3 mAh·g^(-1) after 180 cycles at 0.1 C rate), exhibiting good electrochemical performance. The experimental results show that the mass loading of the copper/graphite composite electrode material is about 4.39 mg·cm^(-2). We also envisage replacing graphite with other high-capacity active materials to fill the current collector, which can provide a reference for the future development of next-generation advanced electrodes.

关键词： Graphite anode Copper current collector Dual three-dimensional porous Nonsolvent-induced phase separation Heat treatment

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Green hydrogen integration in the built environment: Cost-risk analysis via stochastic optimisation

Green hydrogen integration in the built environment: Cost-ri...

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International Conference on energy Transition in the Mediterranean Area (SyNERGY MED)

作者： Andreas V. Olympios Fanourios Kourougianni Alexandros Arsalis Charalampos Konstantinou Andreas Kyprianou Panos Papanastasiou George E. Georghiou Department of Electrical and Computer Engineering PV Technology Laboratory University of Cyprus Nicosia Cyprus PHAETHON Centre of Excellence for Intelligent Efficient and Sustainable Energy Solutions Nicosia Cyprus Department of Chemical Engineering Clean Energy Processes (CEP) Laboratory Imperial College London UK Department of Civil and Environmental Engineering University of Cyprus Nicosia Cyprus Department of Mechanical and Manufacturing Engineering University of Cyprus Nicosia Cyprus

ISBN: (数字)9798350375923

ISBN: (纸本)9798350375930

Green hydrogen offers a long-term energy storage solution for excess renewable electricity, which can enhance building self-sufficiency and energy resilience. However, electrolysers and fuel cells involve high investment costs. In this work, a stochastic optimisation framework is developed which incorporates uncertainty into an energy planning tool performing technology design and operation optimisation. The potential of green hydrogen when coupled to electricity, heating and cooling systems is investigated for a hypothetical household community in the Mediterranean region, addressing the fundamental question: How does accounting for the impact of uncertainties associated with future electricity prices affect the economic viability of green hydrogen in residential communities? The results show that a risk-prone strategy lowers expected costs by 8%, but a risk-averse approach reduces risk by 5%. Overall, considering uncertainty in the optimisation problem strengthens the role of green hydrogen in risk-averse strategies, requiring higher investments but reducing dependence on future resource price fluctuations.

关键词： Uncertainty Costs Electricity Buildings Stochastic processes Green hydrogen Vectors Planning Optimization Investment

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Overlooked Non-Homogeneous Effects in Solar Gasification of Biomass

SSRN

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SSRN 2024年

作者： Zhong, Dian Li, Jieyang Zeng, Kuo Li, Jun Chen, Xin Flamant, Gilles Yang, Haiping Chen, Hanping State Key Laboratory of Coal Combustion Huazhong University of Science and Technology 1037 Luoyu Road Hubei Wuhan430074 China Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen518055 China Processes Materials and Solar Energy Laboratory PROMES CNRS 7 rue du Four Solaire Font-Romeu-Odeillo-Via66120 France

Biomass gasification driven by solar energy is a potential route for the syngas production as well as storage of unsteady solar energy. However, the influences of the non-homogeneous effects caused by unidirectional concentrated solar radiation on the gasification process were overlooked in existing studies, which in turn led to the inaccuracy of the developed models and design of solar reactor. In this work, the on-line solar gasification experiments of char pellets derived from solar pyrolysis of willow wood were conducted at a temperature of 800-1500°C. The results showed that the special hierarchical structure of char pellet had little effect on the syngas yield, but led to a non-homogeneous gasification process characterized by the existence of two reaction stages. CT scanning further revealed the evolution mode of the surface and the inner char pellets during the two gasification stages. The kinetic analysis based on gas-solid reaction model and charge conversion was combined and performed for the first time on the solar gasification. And the reaction mechanisms of two gasification stages from low-high temperature ranges were best described by the RPM-R3 and the R3-RPM, respectively. The activation energy of the two stages were 141.27 and 119.13 kJ/mol respectively. This work brought a new insight and methods for the study of solar gasification, and provided a theoretical basis for a more accurate modelling of solar gasification as well as the design of solar reactor. © 2024, The Authors. All rights reserved.

关键词： Activation energy

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