Готові списки джерел за темами / Coefficient d'asymétrie du cycle de charge

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Добірка наукової літератури з теми "Coefficient d'asymétrie du cycle de charge"

Автор: Grafiati

Опубліковано: 3 лютого 2024

Оновлено: 31 липня 2025

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Статті в журналах з теми "Coefficient d'asymétrie du cycle de charge"

Madani, Seyed Saeed, Erik Schaltz, and Søren Knudsen Kær. "An Experimental Analysis of Entropic Coefficient of a Lithium Titanate Oxide Battery." Energies 12, no. 14 (2019): 2685. http://dx.doi.org/10.3390/en12142685.

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In order to understand the thermal behaviour of a lithium-ion battery, the heat generation within the cell should be determined. The entropic heat coefficient is necessary to determine for the heat generation calculation. The entropic heat coefficient is one of the most important factors, which affects the magnitude of the reversible heat. The purpose of this research is to analyze and investigate the effect of different parameters on the entropic coefficient of lithium titanate oxide batteries. In this research, a lithium ion pouch cell was examined in both charging and discharging situations

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Ning, Jing Hong, and Sheng Chun Liu. "Performance Experiment of Natural Refrigerant Cascaded Refrigeration System." Advanced Materials Research 383-390 (November 2011): 846–51. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.846.

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In this paper, the performances of natural refrigerant R290/CO2 cascaded refrigeration system using R290 as high temperature cycle refrigerant and CO2 as low temperature cycle refrigerant were investigated experimentally. The test results show that both CO2 compressor and R290 compressor start up stably and present good running performance. The start-up power and start-up electric current of CO2 compressor are higher than that of R290 compressor. The COP (Coefficient of performance) of R290/CO2 cascaded system enhances with the increase of cooling water mass flow rate and the decrease of cooli

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Verbovytskyy, Yu V. "Electrochemical charge-discharge characteristics of RMgNi3.5Mn0.5 alloys." Physicochemical Mechanics of Materials 61, no. 3 (2025): 137–43. https://doi.org/10.15407/pcmm2025.03.137.

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The RMgNi3.5Mn0.5 (R – La, Pr, Nd) alloys were investigated as materials for negative electrodes of nickel-metal hydride (Ni–MH) batteries. The electrodes are characterized by discharge capacities of 237–291 mAh/g at charge-discharge current density of 30 mA/g. Cyclic voltammetry showed that the main charge-discharge reactions correspond to single-stage hydrogenation and dehydrogenation processes. The cycle stability of the electrode materials was investigated at a charge-discharge current density of 200 mA/g. Electrodes based on PrMgNi3.5Mn0.5 and NdMgNi3.5Mn0.5 exhibit high-rate discharge ab

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Rogiers, Jana, Tanya Deblaere, Xander van Heule, Bernd Ameel, Steven Lecompte, and Michel De Paepe. "Modelling of the refrigerant distribution in a critically charged propane heat pump cycle for performance evaluation." Journal of Physics: Conference Series 2766, no. 1 (2024): 012077. http://dx.doi.org/10.1088/1742-6596/2766/1/012077.

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Abstract The investigation of heat pumps employing natural refrigerants as working fluids has gained substantial momentum, driven by increasingly stringent regulations addressing the global warming potential (GWP) and ozone depletion potential (ODP) of refrigerants. Propane (R290) stands out as an attractive option due to its low GWP and zero ODP. However, a major drawback of propane lies in its flammability. When using propane as working fluid, it will therefore be necessary to limit the total refrigerant charge within the system, without compromising on the heat pump performance. This study

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Xue, Qian, and Xijuan Chen. "Optimization of Planar Array Electrostatic Sensor for Metal Surface Defect Detection." Journal of Physics: Conference Series 2370, no. 1 (2022): 012019. http://dx.doi.org/10.1088/1742-6596/2370/1/012019.

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Static electricity is usually generated in the damage area of the metal surface due to contact friction, and the charge distribution density can reflect the size, shape, and relative position of the damage area. Based on this, a planar array electrostatic sensor is designed to detect metal surface defect in this paper, and the shielding method, number of electrodes, electrode shape, and arrangement of the sensor are optimized taking account of the induced charge value, the uniformity of sensitivity and the image correlation coefficient. Different image reconstruction algorithms (e.g. Landweber

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Si, Qianli, Shoichi Matsuda, Youhei Yamaji, Toshiyuki Momma, and Yoshitaka Tateyama. "Predicting Cycle Life of Lithium Metal Batteries Using Discharge/Charge Capacity and Voltage Relaxation Features Via Machine Learning." ECS Meeting Abstracts MA2024-02, no. 3 (2024): 391. https://doi.org/10.1149/ma2024-023391mtgabs.

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Introduction Precise estimation of battery cycle life is crucial for assessing quality and planning long-term battery management systems. Given the nonlinear nature of battery degradation, early and accurate cycle life prediction amid minimal degradation is exceptionally difficult. Machine learning (ML) methods, independent of specific mechanisms, can offer promising alternatives for predicting battery lifespan1. Li metal anode battery (LMB) is a promising next-generation battery because of the high energy density, whereas the safety concern with complex degradation mechanisms is still a cruci

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Xingcai, Lu, Ji Libin, Ma Junjun, and Huang Zhen. "Experimental study on the cycle-by-cycle variations of homogeneous charge compression ignition combustion using primary reference fuels and their mixtures." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 221, no. 7 (2007): 859–66. http://dx.doi.org/10.1243/09544070jauto481.

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In this paper, the combustion stabilities and cycle-by-cycle variations of homogeneous charge compression ignition (HCCI) combustion using neat n-heptane, PRF20, PRF40, PRF50, and PRF60 were investigated. In-cylinder pressures of 100 combustion cycles for each test fuel on a single-cylinder engine were recorded. Consequently, cycle-to-cycle variations of the main combustion parameters and performance parameters were analysed, and the interdependency between the combustion parameter and performance parameters were also evaluated. The results reveal that the cycle-by-cycle variations deteriorate

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Tong, Xiangling, Junyuan Zhong, Xinxin Hu, and Fan Zhang. "Preparation and Performance of Highly Stable Cathode Material Ag2V4O11 for Aqueous Zinc-Ion Battery." Crystals 13, no. 4 (2023): 565. http://dx.doi.org/10.3390/cryst13040565.

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One of the hottest research topics at present is the construction of environmentally friendly and secure aqueous zinc-ion batteries (AZIBs) using an aqueous electrolyte instead of an organic electrolyte. As a result of their diverse structure, valence state, high theoretical specific capacity, and other benefits, vanadium-based materials, which are frequently employed as the cathode of AZIBs, have drawn the attention of many researchers. The low cycle stability of zinc ion batteries (ZIBs) is mostly caused by the disintegration of the vanadium-based cathode materials during continuous charge a

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Jeon, Min-Ju. "Experimental Analysis of the R744/R404A Cascade Refrigeration System with Internal Heat Exchanger. Part 1: Coefficient of Performance Characteristics." Energies 14, no. 18 (2021): 6003. http://dx.doi.org/10.3390/en14186003.

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This study evaluates the performance of an R744/R404A cascade refrigeration system (CRS) with internal heat exchangers (IHE) in supermarkets. R744 is used as the refrigerant in a low-temperature cycle, and R404A is used as the refrigerant in a high-temperature cycle. In previous studies, there are many studies including theoretical performance analysis of the CRS. However, experimental studies on the CRS are lacking, and experimental research on the R744/R404A system with an IHE is scarce. Therefore, this study provides basic data for optimal refrigeration system design by experimentally evalu

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Bramlage, Silke, and Klaus-Jürgen Wolter. "Effects of Vapor Phase Soldering on the Properties of Piezoceramic Materials." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2012, CICMT (2012): 000603–5. http://dx.doi.org/10.4071/cicmt-2012-tha24.

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Eight different PZT (lead zirconate titanate) materials (Navy Type I and II) with Curie temperatures between 250 °C and 350 °C were subjected to a standard vapor phase soldering process with a peak temperature of 240 °C for three cycles. As indicators for the depolarization, the piezoelectric charge coefficient (d33) and the coupling coefficient (keff) were measured both before and after each heat treatment. Our studies demonstrate reductions in piezoelectric properties between 5% and 20%, depending on the Curie temperature of the corresponding material. The effects of the second and third cyc

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Дисертації з теми "Coefficient d'asymétrie du cycle de charge"

Didych, Iryna. "Estimation of structural integrity and lifetime of important structural elements." Electronic Thesis or Diss., Université Clermont Auvergne (2021-...), 2021. http://www.theses.fr/2021UCFAC116.

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Ce travail a été réalisé sous co-tutelle entre l’Université Technique Nationale de Ternopil (Ukraine) et l’Université Clermont Auvergne, CNRS, SIGMA Clermont, l’Institut Pascal à Clermont-Ferrand (France). La thèse porte sur la solution d’une tâche scientifique réelle d’évaluer la résistance et la durabilité des éléments responsables des structures. L’objectif de l’étude est d’évaluer la résistance et la durabilité résiduelle des éléments structurels par des méthodes d’apprentissage automatique. La plupart des parties des machines et des composants des structures pendant l'exploitation sont in

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Bigot, Jérôme. "Étude du refroidissement diphasique d'une pile à combustible de traction automobile." Université Joseph Fourier (Grenoble ; 1971-2015), 2005. http://www.theses.fr/2005GRE10225.

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Cette étude s'inscrit dans le cadre du refroidissement des piles à combustible de traction automobile. La solution étudiée au cours de ce travail est le recours à écoulement en ébullition dans des mini-canaux situés à l'intérieur de la pile. Pour améliorer les connaissances encore disparates dans la bibliographie, deux bancs d'essais ont été construits. Le premier est constitué d'un seul mini-canal de section carré de 1 mm de côté pour se familiarise avec les techniques de mesure de pression et de température dans des petites dimensions et identifier les régimes d'ébullition prédominants. Le d

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Частини книг з теми "Coefficient d'asymétrie du cycle de charge"

Thakur, Vaishali, and Ekta Sharma. "Application of Carbonaceous Quantum dots in Energy Storage." In Carbonaceous Quantum Dots: Synthesis And Applications. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815136265123010012.

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Carbon quantum dots (CQDs) are a type of carbon nanomaterial that has lately received attention as a potential replacement for standard semiconductor quantum dots (QDs). CQDs feature a quasi-spherical structure and amorphous to nanocrystalline carbon cores with diameters of 10-20 nm. Based on the carbon core, CQDs are further classified as graphene quantum dots (GQDs), carbon nanodots (CNDs), and polymer dots (PDs). CQDs exhibit unique electrical and optical properties due to their bigger edge effects and quantum confinement; better than graphene oxide nanosheets, they can also be easily split

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"Performance of Adsorptive Heat Storage Devices for Heat Supply." In Technology Development for Adsorptive Heat Energy Converters. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4432-7.ch005.

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The chapter is focused on modelling of performance of adsorptive heat storage devices and estimation of performance of heat storage devices. Two groups of models of adsorptive heat storage units suggested previous researchers are analyzed. The first one is focused on predicting the heat energy storage density, it being based on Dubinin-Polanyi theory. The second one is devoted to analyzing the kinetic of adsorption processes and performance of the adsorber or adsorptive-desorptive reactor filled with traditional adsorbent or salt which forms crystalline hydrates. The key drawback of both group

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Тези доповідей конференцій з теми "Coefficient d'asymétrie du cycle de charge"

Gardiner, David P., W. Stuart Neill, and Wallace L. Chippior. "Real-Time Monitoring of Combustion Instability in a Homogeneous Charge Compression Ignition (HCCI) Engine Using Cycle-by-Cycle Exhaust Temperature Measurements." In ASME 2012 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icef2012-92191.

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This paper describes an experimental study concerning the feasibility of monitoring the combustion instability levels of an HCCI engine based upon cycle-by-cycle exhaust temperature measurements. The test engine was a single cylinder, four-stroke, variable compression ratio Cooperative Fuel Research (CFR) engine coupled to an eddy current dynamometer. A rugged exhaust temperature sensor equipped with special signal processing circuitry was installed near the engine exhaust port. Reference measurements were provided by a laboratory grade, water-cooled cylinder pressure transducer. The cylinder

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Juttu, S., S. S. Thipse, Praveen Mishra, N. B. Dhande, N. V. Marathe, and M. K. Gajendra Babu. "Experimental Investigations of Cycle-to-Cycle and Cylinder-to-Cylinder Variation of PCCI Combustion With High Injection Pressures." In ASME 2010 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/icef2010-35021.

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Recently HCCI combustion concept has gained the attention of industry and academia due to its potential to reduce NOx and PM emissions simultaneously from diesel engines. The HCCI concept also called as Partially-Premixed Charge Compression Ignition (PCCI) when heavy fuel like diesel is used as fuel. To achieve homogeneous mixture of diesel+air+residual gases, high injection pressures are required with fine atomization. The cycle-to-cycle and cylinder-to-cylinder variations in rail pressure and EGR ratio caused to variations in engine performance. In this study combustion stabilities and cycle

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See, Y., M. Wang, J. Bohbot, and O. Colin. "Validation of Species-Based Extended Coherent Flamelet Model in a Large Eddy Simulation of a Homogeneous Charge Spark Ignition Engine." In ASME 2020 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icef2020-2942.

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Abstract The Species-Based Extended Coherent Flamelet Model (SB-ECFM) was developed and previously validated for 3D Reynolds-Averaged Navier-Stokes (RANS) modeling of a spark-ignited gasoline direct injection engine. In this work, we seek to extend the SB-ECFM model to the large eddy simulation (LES) framework and validate the model in a homogeneous charge spark-ignited engine. In the SB-ECFM, which is a recently developed improvement of the ECFM, the progress variable is defined as a function of real species instead of tracer species. This adjustment alleviates discrepancies that may arise wh

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Fu, Xue-Qing, Yan Zhang, Zhanming Ding, et al. "Numerical Study on High-Load Performance of a Two-Stage Boosted Poppet-Valved Two-stroke Diesel Engine." In WCX SAE World Congress Experience. SAE International, 2023. http://dx.doi.org/10.4271/2023-01-0443.

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<div class="section abstract"><div class="htmlview paragraph">Two-stroke cycle is one of the most effective methods to increase the torque and power output of a four-stroke engine due to the doubled firing frequency compared to four-stroke cycle at the same engine speed. As the two-stroke cycle lacks separate intake and exhaust strokes, the positive pressure difference between intake and exhaust ports is required to drive fresh charge into the cylinder, and is affected by intake port structures due to the different amounts of short-circuited fresh charge during scavenging process.

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Dalkilic¸, Ahmet Selim, and Somchai Wongwises. "Comparison of Various Alternative Refrigerants for Vapour Compression Refrigeration Systems." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44267.

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Single-stage vapour compression refrigeration system was compared with an actual vapour compression cycle, single-stage process with internal heat exchanger, and a two-stage process with economiser using the refrigerants of HCFC-22, CFC-502 and their alternatives such as HFC-134a, HFC-32, HFC-152a, HFC-404A, HFC-407C, HFC-507, HFC-410A. A theoretical performance study on a cascade refrigeration system was performed using two refrigeration cycles connected through the heat exchanger in the middle working as the evaporator for the high pressurized cycle and condenser for the low pressurized cycl

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Zhou, Rongliang, Juan Catano, Tiejun Zhang, et al. "The Steady-State Modeling and Analysis of a Two-Loop Cooling System for High Heat Flux Removal." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11500.

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Steady-state modeling and analysis of a two-loop cooling system for high heat flux removal applications are studied. The system structure proposed consists of a primary pumped loop and a vapor compression cycle (VCC) as the secondary loop to which the pumped loop rejects heat. The pumped loop consists of evaporator, condenser, pump, and bladder liquid accumulator. The pumped loop evaporator has direct contact with the heat generating device and CHF must be higher than the imposed heat fluxes to prevent device burnout. The bladder liquid accumulator adjusts the pumped loop pressure level and, h

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Zhou, Rongliang, Juan Catano, Tiejun Zhang, et al. "The Steady-State Modeling and Static System Design of a Refrigeration System for High Heat Flux Removal." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-69074.

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This paper investigates the steady-state modeling and static system design of a refrigeration system for high heat flux removal of high power electronics system. The refrigeration cycle considered consists of multiple evaporators, liquid accumulator, compressor, condenser and expansion valves. In contrast with conventional refrigeration systems with liquid-to-liquid heat exchangers for temperature control where the critical heat flux (CHF) is not a major concern, refrigeration systems for high heat flux removal have to ensure that the incoming heat flux is lower than the CHF to prevent device

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Baratta, Mirko, Stefano d’Ambrosio, Ezio Spessa, and Alberto Vassallo. "Analysis of Cyclic Variability in a Bi-Fuel Engine by Means of a ‘Cycle-Resolved’ Diagnostic Technique." In ASME 2005 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/icef2005-1214.

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The paper investigates cyclic variability in a fast-burn engine running on both gasoline or CNG by applying a new diagnostic technique based on a quasi-dimensional multizone model. Two different procedures were proposed for the ‘cycle-resolved’ calibration of the heat transfer correlation in the multizone model. The first procedure relates the cycle-resolved unreleased energy of the charge at the end of the flame propagation to the combustion efficiency determined from the average exhaust gas composition. The second procedure evaluates the coefficient in the heat transfer correlation through t

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Vorraro, Giovanni, and James W. G. Turner. "Numerical assessment of the performance and emissions of a compact Wankel rotary engine applied as a range extender on the BMW i3 model." In 2023 JSAE/SAE Powertrains, Energy and Lubricants International Meeting. Society of Automotive Engineers of Japan, 2023. http://dx.doi.org/10.4271/2023-32-0068.

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<div class="section abstract"><div class="htmlview paragraph">Amongst all the hybrid-vehicles technologies and layouts, range-extended electric vehicles are the ones with the real prospect to reduce the emissions produced by the thermal machine when in driving conditions, while assuring an adequate range for the common user. The BMW i3 represents one of the most successful series hybrid electric vehicles, having been on the market since 2013. Given the complexities of a hybrid layout employing both thermal and electrical machines, the range extender must have compactness and lightw

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Fan, Xiaowei, Xianping Zhang, Xinli Wei, Fang Wang, and Xiaojing Zhang. "Performance Assessment of Blends of CO2 With Eco-Friendly Working Fluids for Heat Pump Applications." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63354.

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Since pure CO2 as refrigerant has some disadvantages failing to meet requirements, binary blends of CO2 (or R744) with other eco-friendly working fluids, R290, R1270, R170, RE170 and HFC134a are proposed in this paper to be used for medium temperature heat pump systems. The eco-friendly refrigerant mixtures can reduce the heat rejection pressure as that for pure CO2, and meanwhile suppress the flammability, explosivity as that for pure HCs or RE170. Based on the pinch point of heat transfer, the numerical models of heat pump cycle using CO2-based mixture are developed. With a comprehensive con

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