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Performance of a Phase Change Material Battery in a Transparent Building

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Fluid Dynamics & Materials Processing 2023年第3期19卷 783-805页

作者： Peter van den Engel Michael Malin Nikhilesh kodur venkatesh Luigi Antonio de Araujo Passos Delft University of Technology Delft2600 GAThe Netherlands CHAM Bakery HouseLondonSW195AUUK

This research evaluates the performance of a Phase Change Material(PCM)battery integrated into the climate system of a new transparent meeting *** main research questions are:a.“Can the performance of the battery be calculated?”and b.“Can the battery reduce the heating and cooling energy demand in a significant way?”The first question is answered in this *** order to be able to answer the second question,especially the way the heat loading in winter should be improved,then more research is *** addition to the thermal battery,which consists of Phase Change Material plates,the climate system has a cross-flow heat exchanger and a heat *** battery should play a central role in closing the thermal balance of the lightweight building,which can be loaded with hot return or cold outdoor *** temperature of the battery plates is monitored by multi-sensors and simulated by the use of PHOENICS(Computational Fluid Dynamics)and *** paper reports reasonable agreement between the numerical predictions and the measurements,with a maximum variance of 10%.The current coefficient of performance for heating and cooling is already high,more than *** is scope for increasing this much further by making use of the very low-pressure difference of the battery(below 25 Pascal),low pressure fans and the ventilation system as a whole.

关键词： Phase change material(PCM) heating ventilation and air-conditioning(HVAC) thermal battery heat exchangers passive energy

FRP加强R/C梁防火性能调查研究(英文)

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消防科学与技术 2007年第5期26卷 492-499页

作者： BREA WILLIAMS LUKE BISBY venkatesh kodur JOSEPH SU MARK GREEN Technical Team Member Halsall Associates Ltd.3001-210 Gladstone Avenue Ottawa Canada Faculty Member Dept.of Civil Engineering Queen's University Kingston Canada Senior Research Officers Fire Risk Management Group Institute for Research in Construction National Research Council of Canada Ottawa Canada

对纤维加强聚合物(FRP)材料加强钢筋混凝土梁在火灾中的防火性能进行了研究。试验结果显示,防火材料能够帮助构件达到标准防火性能,同时对不断增长的FRP应用也很重要。介绍了不同文献对FRP在高温下的性能所做的研究以及目前标准对建筑... 详细信息

对纤维加强聚合物(FRP)材料加强钢筋混凝土梁在火灾中的防火性能进行了研究。试验结果显示,防火材料能够帮助构件达到标准防火性能,同时对不断增长的FRP应用也很重要。介绍了不同文献对FRP在高温下的性能所做的研究以及目前标准对建筑构件的耐火极限要求。对两个大型试验进行了介绍。试验材料为混凝土梁构件,外部用FRP板加强,并且三分之二用专利耐火隔热材料保护。给出了试验结果,并重点强调了曝火状态下所测得的构件温度。试验数据验证了热传导数值模型,该模型可用于预测加强并绝缘钢筋混凝土梁构件内的温度。试验结果和模型数据显示,正确设计和进行绝缘保护的FRP加强梁构件耐火极限能够达到4h或者以上。

关键词：纤维加强聚合物(FRP) 时间温度标准曲线数值模拟耐火极限

确定不均匀温度作用下梁柱塑性轴力-弯矩承载力曲线的简化方法

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钢结构(中英文) 2010年第7期 77-77页

作者： Mahmud Dwaikat venkatesh kodur

受约束钢杆,当暴露在火中时,会产生作用力,并将梁或柱的反应转化为梁-柱反应。通过轴力-弯矩承载力曲线(P-M曲线)确定梁-柱的极限承载力。规范推荐使用平均温度来确定高温下的P-M曲线。该假定适用于钢材温度均匀的情况,如:4面都暴露于... 详细信息

受约束钢杆,当暴露在火中时,会产生作用力,并将梁或柱的反应转化为梁-柱反应。通过轴力-弯矩承载力曲线(P-M曲线)确定梁-柱的极限承载力。规范推荐使用平均温度来确定高温下的P-M曲线。该假定适用于钢材温度均匀的情况,如:4面都暴露于火中的柱,但不能用于1、2或3面暴露于火中的柱,因为截面上存在温差。温差导致P-M曲线严重歪曲,基于均匀温度假定的承载力曲线不能用于确定这类梁-柱的极限承载力。调整均匀温度作用下塑性P-M曲线,以考虑温差引起的形状变化。首先,计算横截面上的温度;然后,通过调整基于平均温度的P-M曲线计算扭曲的P-M曲线。用算例演示了该方法在设计中的应用,结果表明,该方法适用于确定不均匀温度作用下梁-柱的极限承载力。

关键词：抗火梁-柱温差热分析轴向塑性交互图

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填充高强混凝土的中空截面钢柱的抗火性能

钢结构(中英文) 2009年第9期 86-86页

作者： Peter Schaumann venkatesh kodur Oliver Bahr

填充高性能混凝土的中空截面钢柱近年来由于其众多优点而被广泛采用。然而,尽管填充普通混凝土的中空截面钢柱的设计方法已经成熟,但对于填充高强混凝土还有很多不确定之处。介绍针对填充高性能混凝土的钢柱性能的数值分析结果进行介绍... 详细信息

填充高性能混凝土的中空截面钢柱近年来由于其众多优点而被广泛采用。然而,尽管填充普通混凝土的中空截面钢柱的设计方法已经成熟,但对于填充高强混凝土还有很多不确定之处。介绍针对填充高性能混凝土的钢柱性能的数值分析结果进行介绍。基于北美和欧洲对高强混凝土和钢材材料特性的研究进行分析。结果显示:可以通过在高强混凝土中加入钢丝纤维来提高中空截面柱的抗火能力。

关键词：高强混凝土中空截面钢柱抗火钢管柱

Performance of insulated FRP-strengthened concrete flexural members under fire conditions

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Frontiers of Structural and Civil Engineering 2021年第1期15卷 177-193页

作者： Pratik P.BHATT venkatesh K.R.kodur Anuj M.SHAKYA Tarek ALKHRDAJI Department of Civil and Environmental Engineering Michigan State UniversityEast LansingMI 48823USA Structural Technologies A Structural Group Company ColumbiaMD 21046USA

This paper presents the results of fire resistance tests on carbon fiber-reinforced polymer(CFRP)strengthened concrete flexural members,i.e.,T-beams and *** strengthened members were protected with fire insulation and tested under the combined effects of thermal and structural *** variables considered in the tests include the applied load level,extent of strengthening,and thickness of the fire insulation applied to the beams and ***,a previously developed numerical model was validated against the data generated from the fire tests;subsequently,it was utilized to undertake a case *** from fire tests and numerical studies indicate that owing to the protection provided by the fire insulation,the insulated CFRP-strengthened beams and slabs can withstand four and three hours of standard fire exposure,respectively,under service load *** insulation layer impedes the temperature rise in the member;therefore,the CFRP-concrete composite action remains active for a longer duration and the steel reinforcement temperature remains below 400°C,which in turn enhances the capacity of the beams and slabs.

关键词： concrete beams concrete slabs carbon fiber-reinforced polymers fire resistance FRP strengthening repair retrofitting

Wavelet Space Partitioning for Symbolic Time Series Analysis

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Chinese Physics Letters 2006年第7期23卷 1951-1954页

作者： venkatesh Rajagopalan Asok Ray Department of Mechanical and Nuclear Engineering College of Engineering The Pennsylvania State University University Park PA 16802-1412 USA

A crucial step in symbolic time series analysis （STSA） of observed data is symbol sequence generation that relies on partitioning the phase-space of the underlying dynamical system. We present a novel partitioning method, called wavelet-space （WS） partitioning, as an alternative to symbolic false nearest neighbour （SFNN） partitioning. While the WS and SFNN partitioning methods have been demonstrated to yield comparable performance for anomaly detection on laboratory apparatuses, computation of WS partitioning is several orders of magnitude faster than that of the SFNN partitioning.

关键词： ANOMALY DETECTION

Appraisal of the carbon to nitrogen(C/N)ratio in the bed sediment of the Betwa River,Peninsular India

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International Journal of Sediment Research 2020年第1期35卷 69-78页

作者： Madavi venkatesh Anshumali Laboratory of Biogeochemistry Department of Environmental Science and EngineeringIndian Institute of Technology(ISM)

Bed sediment carbon to nitrogen(C/N) ratio is one of the essential variables reflecting sources of organic matter in river *** order to explore the spatial variability in sources of sediment C/N ratios,and the influence of land use and land cover(LULC) changes on the Betwa River basin in Peninsular India,51 river bed sediment samples were collected in December *** coefficient of variation(CV) was>35%indicating highly variable biogeochemical *** sediment C/N ratio varied from 2.94 to 10.***.3.21-56.40,and 6.50-76.97 in upstream,mid-stream,and downstream regions,respectively,indicating a progressive change in sources of organic matter and depositional *** positive correlation between total carbon(TC) and C/N ratio was increasing in the downstream direction [upstream(+0.560)更多还原AbstractFilter('ChDivSummary', 'ChDivSummaryMore', 'ChDivSummaryReset');

关键词： Bed sediment C/N ratio ANOVA analysis Bundelkhand region Marginal alluvial plain

Thermal,corrosion and wear analysis of copper based metal matrix composites reinforced with alumina and graphite

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Defence Technology（防务技术） 2018年第4期14卷 346-355页

作者： venkatesh R Vaddi Seshagiri Rao Department of Mechanical Engineering St.Joseph's College of EngineeringChennai600119TamilnaduIndia St.Joseph's College of Engineering ChennaiTamilnaduIndia

The wear and corrosion resistances are important in marine applications, especially when it comes to structural support components like bearings, bushes and blocks. The copper hybrid metal matrix components are the new avenues explored in this front. A novel combination of alumina and graphite were considered as the reinforcements in a copper base for the development of a metal matrix *** metallurgical techniques were used for the development of the MMC. The Vickers' s hardness value of 64.9 Hv has been observed by increasing the volume of alumina. Thermogravimetric analyses were carried out on material samples to estimate the exact sintering temperature and identified that 450-700℃ would be conducive. The TGA curves shows two step decomposition exists between 430 ℃-460 ℃. FT-IR analysis was done to confirm the peak values of the materials. FTIR exposed the peak value of 1600 cm^(-1) for alumina where as for Copper and graphite peak values have been 2840 cm^(-1) and 17260 cm^(-1) respectively. The potentio dynamic analysis was done to estimate the rate of corrosion on the samples. The sample with nano and micro reinforcements offered intensive resistance to corrosion. The presence of graphite minimized the weight loss of the samples during the corrosion test. Finally the wear rates of the samples were estimated using the Pin On Disc experimental setup. The samples with nano material reinforcement and with a maximum proportion of graphite exhibited a better wear rate of 1.52×10^(-12) m^2/kg under maximum load conditions.

关键词： TGA FTIR Corrosion Pin-on-disc Wear rate

Unusual cause of recurrent vomiting with failure to thrive in an infant

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World Journal of Pediatrics 2022年第5期18卷 361-362页

作者： Vybhav venkatesh Antaryami Pradhan Department of Gastroenterology and Hepatobiliary Sciences IMS and SUM HospitalBhubaneswar 751003OdishaIndia Department of Pediatric Surgery.IMS and SUM Hospital BhubaneswarOdishaIndia

A 10-month-old boy,symptomatic from 1 month of age with recurrent episodes of regurgitation,non-projectile vomiting,and recurrent episodes of cough and breathlessness requiring frequent hospitalizations was admitted f... 详细信息

关键词： vomiting admitted infant