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Experimental investigation on jet impingement heat transfer analysis in a channel flow embedded with V-shaped patterned surface 嵌入v形表面通道流中射流冲击换热分析的实验研究
Pub Date : 2023-10-02 DOI: 10.1080/15567036.2023.2273409
Yashwant Singh Bisht, S D Pandey, Sunil Chamoli
ABSTRACTHeating and cooling systems benefit from jet impingement as it increases efficiency while reducing operating costs. The combined methodology, integrating jet impingement and passive heat transfer through the use of roughened surfaces, offers significant potential for improving heat transfer. This research presents the results of an experimental study on a channel flow commonly used for air heating, known as a solar air heater (SAH), with impinging air on the heated surface. The surface is embedded with V-shaped ribs as turbulence promoters, and it receives a continuous heat flow of 1,000 W/m2. Various design combinations were tested experimentally, including streamwise pitch ratio X/Dh = 0.866, spanwise pitch ratio Y/Dh = 0.866, jet diameter to hydraulic diameter ratio Dj/Dh = 0.065, and an angle of attack (α) ranging from 45° to 90°. During these experiments, the Re varied from 3,500 to 18,000. The optimal improvement was observed at values of X/Dh = Y/Dh = 0.866, Dj/Dh = 0.065, and α = 60°. This paper presents novel findings demonstrating that incorporating V-shaped rib patterns in SAHs can yield Nusselt numbers up to 5.2 times higher than those in smooth duct SAHs, offering substantial potential for enhanced energy efficiency. When the entering jet impacts and flows along the ribs of the absorber, the findings suggest that the V-shaped ribs accelerate the flow, resulting in enhanced heat transfer. All datasets were also analyzed for their thermo-hydraulic performance, with the maximum value recorded as 3.301 within the constraint range used in this analysis.KEYWORDS: Jet impingementheat transfercoupled techniqueV-shaped ribsjet diameter Nomenclature STC=Solar thermal collectorSAH=Solar air heaterCp=Specific heat in J/(kg K)Dj=Diameter of the jet in mmΔPd=Pressure drop across the duct in Pascal (Pa)Dh=Hydraulic diameter in mmK=Conductivity of air in W/(m·K)To=Outlet temperature in °CRe=Reynolds numberNu=Nusselt numberNus=Nusselt number for smoothf=Friction factorfs=Friction factor for smoothTi=Inlet temperature in °CTEF=Thermohydraulic performanceV=Velocity of air in m/sX/Dh=Streamwise pitch ratioY/Dh=Spanwise pitch ratioDj/Dh=Jet diameter to hydraulic diameter ratiom˙a=Mass flow rate of air in (kg/s)Greek letters=ρa=Density of airυa=Kinematic viscosity of airDisclosure statementNo potential conflict of interest was reported by the author(s).Additional informationNotes on contributorsYashwant Singh BishtYaswant Singh Bisht is working as an Assistant Professor in the Department of Mechanical Engineering, Uttaranchal Institute of Technology, Uttaranchal University Dehradun, India. He is doing research in the area thermal engineering, CFD.S D PandeyDr. S D Pandey working as a Professor and Dean in Uttaranchal Institute of Technology, Uttaranchal University Dehradun, India. He has more than 15 years of research and teaching experience. He has guided many students and published many research articles in top-notch journals and conferences.Sun
加热和冷却系统受益于射流冲击,因为它提高了效率,同时降低了运行成本。通过使用粗糙表面,结合了射流冲击和被动传热的综合方法,为改善传热提供了巨大的潜力。本研究介绍了一种通常用于空气加热的通道流的实验研究结果,称为太阳能空气加热器(SAH),在加热表面上撞击空气。表面嵌入v形肋作为湍流促进剂,接收1000 W/m2的连续热流。实验测试了不同的设计组合:流向螺距比X/Dh = 0.866,展向螺距比Y/Dh = 0.866,射流直径与水力直径比Dj/Dh = 0.065,攻角(α)为45°~ 90°。在这些实验中,Re在3500到18000之间变化。在X/Dh = Y/Dh = 0.866、Dj/Dh = 0.065、α = 60°时,改善效果最佳。本文提出的新发现表明,与光滑管道SAHs相比,在SAHs中加入v形肋型可以产生高达5.2倍的努塞尔数,为提高能源效率提供了巨大的潜力。当进入的射流撞击并沿着吸收体肋部流动时,研究结果表明,v形肋部加速了流动,从而增强了传热。还分析了所有数据集的热液性能,在本分析中使用的约束范围内,记录的最大值为3.301。关键词:飞机impingementheat transfercoupled techniqueV-shaped ribsjet直径命名STC =太阳热能collectorSAH =太阳能空气heaterCp =比热J / K(公斤)Dj =喷气mm直径ΔPd =通过管道的压降帕斯卡(Pa) Dh =水力直径是mmK =电导率的空气在W / (m·K) =出口温度°CRe =雷诺兹numberNu =努塞尔特numberNus =努塞尔特数为smoothTi smoothf =摩擦factorfs =摩擦系数=入口温度°CTEF =热工水力performanceV =速度m/sX/Dh=流向螺距比y /Dh=展向螺距比odj /Dh=射流直径与水力直径比˙a=空气质量流量(kg/s)希腊字母=ρa=空气密度a=空气运动粘度披露声明作者未报告潜在的利益冲突。作者简介:asashwant Singh Bisht是印度北方邦大学机械工程系的助理教授。他的研究领域是热工程,CFD。潘迪博士S D Pandey,印度北方邦理工学院教授兼院长。他有超过15年的研究和教学经验。他指导了许多学生,并在一流期刊和会议上发表了许多研究论文。苏尼尔ChamoliDr。Sunil Chamoli是GB Pant工程技术研究所机械工程助理教授,对学术界做出了重大贡献。他指导了许多本科生、研究生和博士生,并在顶级期刊上发表了大量文章。他值得注意的成就包括跻身前2%的科学家名单,这证明了他在该领域的影响力。
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引用次数: 0
Powertrain parameters and control strategy optimization of a novel master-slave electric-hydraulic hybrid vehicle 一种新型主从式电液混合动力汽车动力系统参数及控制策略优化
Pub Date : 2023-10-02 DOI: 10.1080/15567036.2023.2263397
Qingxiao Jia, Caihong Zhang, Hongxin Zhang, Zhen Zhang, Hao Chen
ABSTRACTThe electric-hydraulic hybrid vehicle (EHHV) is an important research area of hybrid electric vehicles (HEV), which provides a competitive project compared to other hybrid technologies. This paper conducts comprehensive research on a master-slave electric-hydraulic hybrid vehicle (MSEHHV). After an integrated driving cycle, the battery state of charge (SOC) values for MSEHHV and electric vehicle (EV) are 44.65% and 38.27%. The economy of the MSEHHV is verified, which is obviously superior to the EV. To further explore the energy conservation potential of the MSEHHV, the research proposes a cooperative optimization method of powertrain parameters and control strategy. Specifically, the optimization objective is to improve SOC. The response surface method (RSM) fits the functional relation between design variables and optimization objective. An optimization model is constructed based on the response surface model. Ultimately, the particle swarm optimization (PSO) algorithm is used for the optimal solution to obtain the optimal parameter combination. To evaluate the adaptability of the method, the performance of three models in the actual driving cycle is compared. Simulation results suggest that the energy consumption of the optimized MSEHHV is 33.41% and 6.33% lower than that of EV and initial MSEHHV. The research provides a valuable reference for the optimal design of electric-hydraulic hybrid technology.KEYWORDS: hybrid electric vehicleelectric-hydraulicparameter optimizationpowertrain componentcontrol strategy Nomenclature EV=HPAHEV=Hybrid electric vehicleEHHV=Electric-hydraulic hybrid vehicleMSEHHV=Master-slave electric-hydraulic hybrid vehicleSOC=State of chargeRSM=Response surface methodPSO=Particle swarm optimization algorithmLHS=Latin hypercube samplingHD=Hydraulic drive modeED=Electric drive modeE-HD=Electric-hydraulic drive modeHRB=Hydraulic regenerative braking modeERB=Electric regenerative braking modeVCU=Vehicle control unitHPA=The high-pressure accumulatorLPA=The low-pressure accumulatorHP/M=Hydraulic pump/motoru=The velocity threshold10-15=Japanese 10-15 mode cycleHWFET=Highway fuel economy testUS06=The US06 supplemental federal test procedureSC03=The SC03 supplemental federal test procedureNEDC=New European driving cycleu1=The low-velocity thresholdu2=The high-velocity thresholdpL=The lowest working pressure of the LPApH=The highest working pressure of the HPAAcknowledgementsThe project is supported partly by the National Natural Science Foundation of China (No. 52075278), and the Municipal Livelihood Science and Technology Project of Qingdao (No. 19-6-1-92-nsh).Disclosure statementNo potential conflict of interest was reported by the authors.Additional informationFundingThis work was supported by the National Natural Science Foundation of China [52107220]; Municipal Livelihood Science and Technology Project of Qingdao [19-6-1-92-nsh].Notes on contributorsQingxiao JiaQingxiao Jia is a degree graduate student at the College
电液混合动力汽车(EHHV)是混合动力汽车(HEV)的一个重要研究领域,与其他混合动力技术相比,它提供了一个有竞争力的项目。本文对主从型电液混合动力汽车(MSEHHV)进行了全面研究。综合循环后,MSEHHV和EV的电池荷电状态(SOC)值分别为44.65%和38.27%。验证了MSEHHV的经济性,明显优于纯电动汽车。为了进一步挖掘MSEHHV的节能潜力,本研究提出了一种动力系统参数和控制策略的协同优化方法。具体来说,优化的目标是提高SOC。响应面法拟合了设计变量与优化目标之间的函数关系。在响应面模型的基础上,建立了优化模型。最后,利用粒子群优化算法(PSO)求解最优解,得到最优的参数组合。为了评价该方法的适应性,比较了三种模型在实际行驶工况下的性能。仿真结果表明,优化后的MSEHHV能耗比EV和初始MSEHHV分别降低了33.41%和6.33%。研究结果为电液混合动力技术的优化设计提供了有价值的参考。关键词:术语EV=HPAHEV=混合动力汽车ehhv =电液混合动力汽车sehhv =主从式电液混合动力汽车oc =充电状态sm =响应面法pso =粒子群优化算法mlhs =拉丁超cube采样hd =液压驱动模式hd =电驱动模式hd =电液驱动模式hrb =液压再生制动模式hrb =电再生制动模式devcu =车辆控制单元thpa =高压蓄能器lpa =低压蓄能器hp /M=液压泵/马达u=速度阈值10-15=日本10-15模式循环hwfet =公路燃油经济性testUS06= US06补充联邦测试程序c03 = SC03补充联邦测试程序renedc =新欧洲驾驶循环1=低速阈值2=高速阈值dpl = LPApH的最低工作压力= LPApH的最高工作压力国家自然科学基金项目(No. 52075278)和青岛市民生科技项目(No. 19-6-1-92-nsh)资助。披露声明作者未报告潜在的利益冲突。基金资助:国家自然科学基金[52107220];青岛市市政民生科技项目[19-6-1-92-nsh]。作者简介贾庆晓(音译)是青岛大学机电工程学院的一名研究生。主要研究方向为新型混合动力汽车参数匹配、能源管理策略设计和系统优化。张彩虹,青岛大学自动化学院讲师。她的专业是控制理论和控制工程。张宏新,青岛大学机电工程学院副院长、教授。主要从事汽车动力传动新技术的设计与仿真。张震,青岛大学机电工程学院硕士研究生。主要研究方向为车辆控制系统和车辆能源管理策略。陈浩,青岛大学机电工程学院硕士研究生。他的研究方向是新型电液混合动力汽车的性能预测。
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引用次数: 0
Review on second-generation synthetic fuel: feedstocks, potential production, deployable technologies, and challenges 第二代合成燃料综述:原料、潜在生产、可部署技术和挑战
Pub Date : 2023-10-02 DOI: 10.1080/15567036.2023.2271433
Shobhit Khanna, Rabindra Prasad, C.P. Jawahar, Zafar Said
ABSTRACTRecent advancements in energy conversion technologies have effectively addressed global challenges like fuel dependency, production costs, waste management, and pollution control. Utilizing natural waste to generate synthetic fuels represents a viable strategy for improved energy conservation, pollution mitigation, cost-effectiveness, sustainable production, and socio-economic development. Synthetic fuels are gaining global prominence as they reduce crude oil consumption, especially in the transportation and industrial sectors. This research meticulously reviews technologies available for synthesizing fuels from biological waste and enhancing feedstock quality. This study highlights the increasing adoption of algae as a feedstock for biofuel extraction via photobioreactors. Moreover, bioethanol and biobutanol can be derived from grasses through the lignocellulosic process. A pressing concern is the disposal of Municipal Solid Waste (MSW); however, biodiesel ester and biogas can be procured from MSW via transesterification and advanced gasification processes. While refined fuel production offers potential solutions to climate change and resource utilization challenges, specific issues persist. These include high production costs, significant power consumption, extended processing times, and inconsistent feedstock collection. Nonetheless, this study emphasizes the potential of advanced biofuel production from second-generation feedstocks. Such biofuels serve as promising carbon-based chemical sources for industrial and transportation applications, filling gaps left by conventional fuels.KEYWORDS: Synthetic fuelalcohol, Biodieselfeedstockmethanoltransesterification Nomenclature ASTM=American Society for Testing and MaterialsBTU=British Thermal UnitCaO=Calcium OxideCH4=MethaneCO2=Carbon DioxideCO=Carbon MonoxideCI=Compression IgnitionCNG=Compressed Natural GasDB=Diesel-Biodiesel blendFFA=Free Fatty AcidFT=Fischer-Tropsch fuelFAME=Fatty Acids and Methyl EstersH2=HydrogenH2O=WaterH2S=Hydrogen SulphideHCl=Hydrochloric acidH2SO4=Sulphuric AcidIC=Internal CombustionKOH=Potassium HydroxideLPG=Liquefied Petroleum GasMTBE=Methyl Tert-Butyl EtherNH3=AmmoniaNOx=Oxides of NitrogenNaOH=Sodium HydroxideNaOCH3=Sodium MethoxideOECD=Organization for Economic Cooperation and DevelopmentPAH=Polycyclic Aromatic HydrocarbonR&D=Research & DevelopmentDisclosure statementNo potential conflict of interest was reported by the author(s).Additional informationNotes on contributorsShobhit KhannaShobhit Khanna is working as a Senior Education Officer in defence, India and having 13 years of experience in designing and implementing effective training programs and curriculum for various academies that are not just academically rigorous but also attuned to the practical requirements of the real world. He has completed his Master’s degree in Thermal Engineering from IIT Madras. He is pursing Doctoral degree in the field of Mechanical Engineering from Amity University Madhya
摘要能源转换技术的最新进展有效地解决了诸如燃料依赖、生产成本、废物管理和污染控制等全球性挑战。利用自然废物生产合成燃料是改善节约能源、减轻污染、提高成本效益、可持续生产和社会经济发展的一项可行战略。合成燃料由于减少了原油的消耗,尤其是在运输和工业领域,正日益成为全球瞩目的焦点。本研究详细回顾了从生物废物中合成燃料和提高原料质量的技术。这项研究强调了越来越多地采用藻类作为原料,通过光生物反应器提取生物燃料。此外,生物乙醇和生物丁醇可以通过木质纤维素过程从草中提取。都市固体废物的处置是一个迫切需要关注的问题;然而,生物柴油酯和沼气可以通过酯交换和先进的气化工艺从城市生活垃圾中获得。虽然精炼燃料生产为气候变化和资源利用挑战提供了潜在的解决方案,但具体问题仍然存在。这些问题包括生产成本高、耗电量大、加工时间长以及原料收集不一致。尽管如此,这项研究强调了利用第二代原料生产先进生物燃料的潜力。这种生物燃料有望成为工业和交通领域的碳基化学来源,填补传统燃料留下的空白。关键词:合成fuelalcohol,生物柴油原料甲醇酯交换命名法ASTM=美国试验和材料学会sbtu =英国热单位cao =氧化钙ech4 =甲烷eco2 =二氧化碳eco =一氧化碳eci =压缩点火cng =压缩天然气db =柴油-生物柴油混合物ffa =游离脂肪酸ft =费托燃料fame =脂肪酸和甲酯sh2 =氢h2o =水h2s =硫化氢hcl =盐酸h2so4 =硫酸=内燃koh =羟化钾elpg =液化石油GasMTBE=甲基叔丁基醚nh3 =氨气anox =氮的氧化物naoh =氢氧化钠aoch3 =甲氧基钠oecd =经济合作与发展组织pah =多环芳烃r&d =研究与开发披露声明作者未报告潜在的利益冲突。shobhit Khanna是印度国防部的一名高级教育官员,在为各种学院设计和实施有效的培训计划和课程方面拥有13年的经验,这些计划和课程不仅在学术上严谨,而且与现实世界的实际要求相适应。他获得了印度理工学院马德拉斯分校的热能工程硕士学位。他正在攻读印度瓜廖尔中央邦阿米蒂大学机械工程领域的博士学位。他还参与了由印度政府资助的各种项目、研讨会/网络研讨会和自由发展计划。Rabindra PrasadDr。Rabindra Prasad目前是瓜廖尔Amity工程技术学院(ASET)的助理教授。他在印度理工学院(BHU)瓦拉纳西完成了机械工程博士学位,并在知名期刊上发表了研究论文。JawaharDr。C. P. Jawahar目前担任Raipur Kalinga大学技术学院的教授和院长。他的研究领域包括可再生能源和热科学。他是印度政府电力部能源效率局认证的能源审计师,并在国际知名期刊和会议上发表了60篇研究论文。征服者SaidDr。Zafar Said是沙迦大学可持续可再生能源工程系的副教授。他的研究领域包括可再生能源、太阳能、传热、人工智能、优化、纳米流体、BTMS、NePCM、储能和纳米润滑剂。根据Web of Science,他发表了250多篇论文,包括《能源与燃烧进展》、《物理报告》、《先进能源材料》、《材料化学杂志A》、《纳米能源》、《可再生和可持续能源评论》、3本书、30本书章节和30篇会议论文),被引用约15100多次,h指数为71。根据Web of Science的数据,他在2019-2023周期有7篇热门论文和几篇高被引论文。在能源领域,他还被Elsevier BV和斯坦福大学(Stanford University)评为2020年、2021年、2022年和2023年世界前2%科学家。他获得了多个著名奖项,包括Research.com颁发的2022年新星科学之星奖。
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引用次数: 0
Effect of two-stage thermal treatment on the reduction of quinoline-insoluble in Mesophase pitch 两段热处理对中间相沥青中不溶喹啉还原的影响
Pub Date : 2023-10-02 DOI: 10.1080/15567036.2023.2271415
Meiqi Wei, Rujun Zha, Jitong Wang, Hao Ling
ABSTRACTMesophase pitch (MP) is an important carbon material precursor with excellent physical performance and has a wide application in new energy utilization field. However, the current preparation process leads to a high quinoline-insoluble (QI) content in the MP, limiting its application. Here, we use two-stage thermal treatment to slow the degree of polycondensation during the formation of the MP. The two-stage thermal treatment can facilitate the formation of MP and limit the generation of QI. Moreover, the low content of polycyclic aromatic hydrocarbons (PAHs) in the liquid by-products indicates that the degree of thermal cracking of the feedstock becomes milder. The high content of cycloparaffins in gaseous by-products is due to the better polycondensation of the feedstock. Therefore, a wide area streamlined MP is prepared, which has a high mesophase content (96.8%), a low QI content (20.6%) and a good crystal structure (Lc = 57.37 Å, N = 17.64, n = 99.53). At last, a possible mechanism of MP sample formation is discussed, which will provide an insight in the optimization of MP preparation process.KEYWORDS: Mesophase pitchfurfural extraction oiltwo-stage thermal treatmentquinoline insoluble substanceGC-MS AcknowledgementsThis work was supported by the National Natural Science Foundation of China [Grant NO. 22008071].Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by the National Natural Science Foundation of China [22008071].Notes on contributorsMeiqi WeiMeiqi Wei is a master's student in Chemical Engineering and Technology at East China University of Science and Technology. She graduated from Zhejiang University of Science and Technology with a bachelor degree in Safety Engineering. Her research interests include mesophase pitch, polycyclic aromatic hydrocarbons and two-stage thermal treatment.Rujun ZhaRujun Zha holds the position of experimentalist within the College of Chemical Engineering at East China University of Science and Technology. He graduated with a Master degree in Chemical Engineering and Technology from East China University of Science and Technology. His research interests include colored binders and styrene butadiene styrene block polymer.Jitong WangJitong Wang is a full professor in the College of Chemical Engineering at East China University of Science and Technology. She graduated from East China University of Science and Technology with a PhD in Chemical Technology. Her areas of interest in research include 2D nanomaterials, energy storage systems, and functionalized carbon nanosheets.Hao LingHao Ling is a full professor in the College of Chemical Engineering at East China University of Science and Technology. He graduated from East China University of Science and Technology with a PhD in Chemical Technology. His research focuses on various fields, including divided-wall columns, deep processing of heavy oil, and asphalt modifie
摘要中间相沥青(MP)是一种重要的碳材料前驱体,具有优异的物理性能,在新能源利用领域有着广泛的应用。然而,目前的制备工艺导致MP中喹啉不溶性(QI)含量高,限制了其应用。在这里,我们使用两阶段热处理来减缓MP形成过程中的缩聚程度。两段热处理有利于MP的形成,限制了QI的生成。此外,液态副产物中多环芳烃(PAHs)的含量较低,表明原料的热裂解程度较轻。气态副产物中环石蜡含量高是由于原料的缩聚效果较好。因此,制备了宽面积流线型MP,其中间相含量高(96.8%),QI含量低(20.6%),晶体结构良好(Lc = 57.37 Å, N = 17.64, N = 99.53)。最后讨论了MP样品形成的可能机理,为MP制备工艺的优化提供参考。关键词:中间相沥青糠醛萃取油两段热处理喹啉不溶性物质gc - ms22008071)。披露声明作者未报告潜在的利益冲突。本研究得到国家自然科学基金资助[22008071]。魏梅琪,华东理工大学化学工程与技术专业硕士研究生。她毕业于浙江科技大学,获得安全工程学士学位。主要研究方向为中间相沥青、多环芳烃和两段热处理。查如军,华东理工大学化学工程学院实验研究员。毕业于华东理工大学化学工程与技术专业,获硕士学位。主要研究方向为有色粘结剂和丁二烯-苯乙烯嵌段聚合物。王继同,华东理工大学化学工程学院正教授。她毕业于华东理工大学化学技术专业,获博士学位。她感兴趣的研究领域包括二维纳米材料、能量存储系统和功能化碳纳米片。郝凌,华东理工大学化学工程学院正教授。他毕业于华东理工大学化学技术专业,获博士学位。主要研究领域包括隔墙柱、重油深加工、沥青改性剂等。
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引用次数: 0
Design and performance investigation of a triple blade dual stage Savonius-alike hydrokinetic turbine from low flow stream reserves 低流量储量三叶双级萨沃尼式水轮机设计与性能研究
Pub Date : 2023-10-02 DOI: 10.1080/15567036.2023.2268572
Kanak Chandra Sarma, Biswajit Nath, Agnimitra Biswas, Rahul Dev Misra
ABSTRACTA trending technology that is being employed to generate hydro energy from low-flow stream reserves is the Savonius-alike hydrokinetic turbine (SAHT). Clearance between the stages of a dual-stage two-bladed SAHT was found to improve its performance at low flow speeds; however, the impact of clearance on the triple-bladed configuration of SAHT was not studied earlier. In this paper, a triple blade dual stage configuration of SAHT is designed, and its performance is investigated in a water flume under various stage clearances (0,5,10,15 and 20 mm), low flow speeds (0.45,0.55 and 0.65 m/s) and different brake loads. Detailed turbine performance under different design and off-design conditions are investigated to obtain meaningful performance insights. The findings show that torque production by the turbine increases with the increase of brake load, with maximum hydrodynamic torque generated at the highest brake load. The highest coefficient of performance and torque of 0.071 and 0.261 are obtained at a stage clearance of 5 mm, tip speed ratio of 0.273, and free-stream flow speed of 0.55 m/s. The present SAHT under design condition has improved performance compared to a dual blade dual stage SAHT exhibiting a wider tip speed ratio range for its application in low flow stream reserves. Further, this turbine may also be recommended for torque generation to work as a motor in a flow speed condition less than 0.5 m/s. The novelty of this work is the application of an additional flow control measure in the form of flow-through clearance to negotiate vertical water thrust through the clearance and exert additional pressure on the advancing blades of the SAHT in the upper stage.KEYWORDS: Savonius-alike hydrokinetic turbinebrake loadscoefficient of performanceflow speedstage clearance Disclosure statementNo potential conflict of interest was reported by the authors.Additional informationNotes on contributorsKanak Chandra SarmaMr. Kanak Chandra Sarma, Ph.D scholar of the National Institute of Technology, Silchar, Assam, India and Lecturer (Senior Scale) of Mechanical Engineering at the Silchar Polytechnic College, Assam, India. Mr. Sarma received his B.Tech. in Mechanical Engineering from Jorhat Engineering College , Assam and his M.Tech. from National Institute of technology, Silchar, Assam. Currently, he is Pursuing Ph.D. in Mechanical Engineering from National Institute of Technology, Silchar, Assam.Biswajit NathMr. Biswajit Nath, Ph.D scholar of the National Institute of Technology, Silchar, Assam, India. He received his B.Tech. in Mechanical Engineering from Anna University, Chennai, Tamil Nadu, India and his M.Tech. from Karunya Institute of Technology and Sciences, Coimbatore, Tamil Nadu, India. Currently, he is Pursuing Ph.D. in Mechanical Engineering from National Institute of technology, Silchar, Assam.Agnimitra BiswasDr. Agnimitra Biswas did his B.E. in Mechanical Engineering from Regional Engineering College Silchar in 2001, M.Tech in Ther
应用于从低流量流储备中产生水能的趋势技术是类似savonius的水动力涡轮机(SAHT)。研究发现,双级双叶片SAHT的两级间隙可以改善其在低流速下的性能;然而,间隙对SAHT三叶片结构的影响尚未得到较早的研究。本文设计了一种三叶双级SAHT结构,并在水槽中研究了不同级隙(0、5、10、15和20 mm)、低流速(0.45、0.55和0.65 m/s)和不同制动载荷下SAHT的性能。详细研究了不同设计和非设计条件下的涡轮性能,以获得有意义的性能见解。结果表明:涡轮产生的扭矩随制动载荷的增大而增大,在最高制动载荷时产生的流体动力扭矩最大;当级隙为5 mm、叶尖速比为0.273、自由流速度为0.55 m/s时,性能系数和转矩分别为0.071和0.261。与双叶片双级SAHT相比,目前设计条件下的SAHT性能得到了改善,在低流量储备条件下,其叶尖速比范围更大。此外,该涡轮还可以推荐用于在小于0.5 m/s的流速条件下作为电机进行转矩产生。这项工作的新颖之处在于采用了一种额外的流动控制措施,以流动间隙的形式来调节通过间隙的垂直水推力,并在上部SAHT的推进叶片上施加额外的压力。关键词:savonius -类水动力涡轮制动负载性能效率流速级间隙披露声明作者未报告潜在的利益冲突。关于贡献者的说明:卡纳克·钱德拉·萨尔玛。Kanak Chandra Sarma,印度阿萨姆邦西尔查尔国立理工学院博士学者,印度阿萨姆邦西尔查尔理工学院机械工程高级讲师。Sarma先生获得了学士学位。在阿萨姆邦乔哈特工程学院获得机械工程硕士学位。来自阿萨姆邦西尔查尔的国立理工学院。目前,他正在攻读阿萨姆邦西尔查尔国立理工学院机械工程博士学位。Biswajit NathMr。比斯瓦吉特·纳特,印度阿萨姆邦西尔查尔国立理工学院博士学者。他获得了学士学位。在印度泰米尔纳德邦金奈的安娜大学获得机械工程硕士学位。来自印度泰米尔纳德邦哥印拜陀Karunya技术与科学研究所。目前,他正在攻读阿萨姆邦西尔查尔国家技术学院机械工程博士学位。Agnimitra BiswasDr。Agnimitra Biswas于2001年在Silchar地区工程学院获得机械工程学士学位,2007年在Silchar国立技术学院获得热工程硕士学位,2010年在NIT Silchar获得机械工程博士学位。他的研究方向是垂直轴风力涡轮机,使用实验和计算方法。他有超过16年的教学和研究经验。目前,他自2022年7月起担任NIT Silchar ME系副教授。Rahul Dev MisraDr。Rahul Dev Misra从Jorhat Engineering获得了机械工程学士学位。1991年Dibrugarh大学下属学院。他于1996年在印度理工学院德里分校获得能源研究专业硕士学位。2004年获美国理工学院鲁尔基分校博士学位。Misra博士于1992年加入西尔查尔国立理工学院(原区域工程学院)机械工程系,担任讲师。现任系教授(HAG)。
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引用次数: 0
Performance research and optimization of marine dual-fuel engine based on RSM and NSGA-II 基于RSM和NSGA-II的船用双燃料发动机性能研究与优化
Pub Date : 2023-10-02 DOI: 10.1080/15567036.2023.2273406
Hong Zeng, Kuo Jiang, Zefan Wu, Xinlong Liu
ABSTRACTIn order to improve the economic efficiency of the ship when sailing and reduce the engine optimization cost. We propose the Response Surface Methodology (RSM) combined with NSGA-II to optimize the engine parameters. First, a simulation model of a marine four-stroke dual-fuel engine is established in AVL-BOOST software. Then, control parameters such as engine speed, exhaust valve opening (EVO) and compression ratio (CR) are planned by design of experiments. The response surface model was established in Design-Expert software. The significant influence of control parameters on performance parameters was studied by analysis of variance (ANOVA). Finally, with the output power, indicated fuel consumption rate and nitrogen oxide emissions as the optimization objectives. Non-dominated Sequential Genetic Algorithm (NSGA-II) is used to optimize the parameters to improve engine performance and reduce emissions. The results show that the established response surface model has good prediction accuracy. The response surface model visualizes the mathematical relationship between the control parameters and the optimization targets. The ANOVA results show that engine speed, EVO and CR have significant effects on engine performance and emissions. The optimization results show that the engine speed is 793 rpm, the EVO is 145°CA, and the CR is 12.3. Compared to standard settings, the optimized data shows a 3.4% increase in power, a 0.3% reduction in ISFC, and a 6.2% reduction in nitrogen oxide (NOx) emissions. The combination of response surface analysis and NSGA-II algorithm to optimize engine performance and emissions is thereby a feasible method.KEYWORDS: Marine engineresponse surface analysismulti-objective optimizationdesign of experimentsNSGA-II Disclosure statementNo potential conflict of interest was reported by the author(s).Author contributionsHong Zeng, male, received Ph.D. degree in Marine Engineering from Dalian Maritime University, in 2012. Since 2013, he has been working as an Associate Professor with Marine Engineering College, Dalian Maritime University, China. From 2018 to 2019, he was a Visiting Researcher with the Department of Naval Architecture, Ocean and Marine Engineering at the University of Strathclyde, UK. He has published more than 30 journal and conference papers. His research interests include the application of the new generation of information technology in marine engineering, mainly focus on the modeling, simulation and control in marine engineering.Data availability statementThe data used to support the findings of this study are available from the corresponding author upon request.Nomenclature ANN=artificial neural networksANOVA=analysis of varianceATDC=after top dead centerBMEP=exhaust valve openingISFC=indicated specific fuel consumptionNOx=nitrogen oxidesN2=nitrogenNSGA-II=Non-dominated Sequential Genetic AlgorithmO2=oxygenRSM=Response Surface MethodologyAdditional informationFundingThis research was funded by High Tec
目前在青岛港驳船有限公司从事船舶发动机管理和新能源创新工作。
{"title":"Performance research and optimization of marine dual-fuel engine based on RSM and NSGA-II","authors":"Hong Zeng, Kuo Jiang, Zefan Wu, Xinlong Liu","doi":"10.1080/15567036.2023.2273406","DOIUrl":"https://doi.org/10.1080/15567036.2023.2273406","url":null,"abstract":"ABSTRACTIn order to improve the economic efficiency of the ship when sailing and reduce the engine optimization cost. We propose the Response Surface Methodology (RSM) combined with NSGA-II to optimize the engine parameters. First, a simulation model of a marine four-stroke dual-fuel engine is established in AVL-BOOST software. Then, control parameters such as engine speed, exhaust valve opening (EVO) and compression ratio (CR) are planned by design of experiments. The response surface model was established in Design-Expert software. The significant influence of control parameters on performance parameters was studied by analysis of variance (ANOVA). Finally, with the output power, indicated fuel consumption rate and nitrogen oxide emissions as the optimization objectives. Non-dominated Sequential Genetic Algorithm (NSGA-II) is used to optimize the parameters to improve engine performance and reduce emissions. The results show that the established response surface model has good prediction accuracy. The response surface model visualizes the mathematical relationship between the control parameters and the optimization targets. The ANOVA results show that engine speed, EVO and CR have significant effects on engine performance and emissions. The optimization results show that the engine speed is 793 rpm, the EVO is 145°CA, and the CR is 12.3. Compared to standard settings, the optimized data shows a 3.4% increase in power, a 0.3% reduction in ISFC, and a 6.2% reduction in nitrogen oxide (NOx) emissions. The combination of response surface analysis and NSGA-II algorithm to optimize engine performance and emissions is thereby a feasible method.KEYWORDS: Marine engineresponse surface analysismulti-objective optimizationdesign of experimentsNSGA-II Disclosure statementNo potential conflict of interest was reported by the author(s).Author contributionsHong Zeng, male, received Ph.D. degree in Marine Engineering from Dalian Maritime University, in 2012. Since 2013, he has been working as an Associate Professor with Marine Engineering College, Dalian Maritime University, China. From 2018 to 2019, he was a Visiting Researcher with the Department of Naval Architecture, Ocean and Marine Engineering at the University of Strathclyde, UK. He has published more than 30 journal and conference papers. His research interests include the application of the new generation of information technology in marine engineering, mainly focus on the modeling, simulation and control in marine engineering.Data availability statementThe data used to support the findings of this study are available from the corresponding author upon request.Nomenclature ANN=artificial neural networksANOVA=analysis of varianceATDC=after top dead centerBMEP=exhaust valve openingISFC=indicated specific fuel consumptionNOx=nitrogen oxidesN2=nitrogenNSGA-II=Non-dominated Sequential Genetic AlgorithmO2=oxygenRSM=Response Surface MethodologyAdditional informationFundingThis research was funded by High Tec","PeriodicalId":11580,"journal":{"name":"Energy Sources, Part A: Recovery, Utilization, and Environmental Effects","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135949798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigating the amount of water on reducing Li x (OH) y Cl z hydroxide phases in the synthesis of Li 3 OCl anti-perovskite as a solid electrolyte in Li-ion batteries 研究Li 3ocl反钙钛矿作为锂离子电池固体电解质合成过程中还原Li x (OH) y Cl z氢氧化物相的水用量
Pub Date : 2023-10-02 DOI: 10.1080/15567036.2023.2275710
Aref Ghanbari, Zahra Khakpour, Aida Faeghinia, Abouzar Massoudi
ABSTRACTThe Li3OCl solid electrolyte was synthesized in the present study via the hydrothermal method. In order to investigate the effect of water on the stability of the Li3OCl phase and reduce the amount of secondary hydroxide phases, different molar ratios of water were added to the precursors during the synthesis procedures. Employing XRD, DSC, FE-SEM, EIS, and CV techniques revealed that the LiCl: LiOH: H2O (1:2:10) molar ratio has better phase stability and fewer undesired hydroxide phases. The DSC results also showed that during the first heat treatment cycle, the Lix(OH)yClz phases were converted to the Li3OCl phase. After heat treatment, the final structure was characterized as a glass-ceramic structure. At 60°C and 110°C, respectively, the synthesized Li3OCl reached an ionic conductivity of 5.0 × 10−2 mS cm−1 and 0.76 mS cm−1. Also, the activation energy of 0.27 eV in the 60–110°C temperature range was recorded for the synthesized Li3OCl. The chemical stability of the synthesized Li3OCl was confirmed during lithiation/delithiation from −1.5 to 4 V at 130°C.KEYWORDS: Anti-perovskiteelectrochemical stabilityhydrothermal synthesishydroxide phasessolid electrolytes AcknowledgementsWe thank the Materials and Energy Research Center, Iran, for the support of this work.Disclosure statementNo potential conflict of interest was reported by the author(s).Author contributionsResearch, material preparation, experimental sections, data collection, data interpretation, and original manuscript writing were done by Aref Ghanbari. Supervision, funding acquisition, conceptualization, results interpretation, manuscript reviewing, and publication-version approval are conducted by Zahra Khakpour. Supervision, methodology, and funding acquisition were done by Aida Faeghinia and Abouzar Massoudi.All authors have read and agreed to the published version of the manuscript.Data availability statementAll data and analysis are available upon request.Additional informationFundingNo funding institutions from the governmental, commercial, or nonprofit sectors contributed any specific grants for this study. No funding institutions from the governmental, commercial, or nonprofit sectors contributed any specific grants for this study.Notes on contributorsAref GhanbariAref Ghanbari, P.h.D student at Materials and Energy Research Center, Ceramic Department. The thesis is concerned with the energy storage, and Li-ion solid state batteries problems.Zahra KhakpourDr. Zahra Khakpour, is the corresponding author and is an assistant professor at Materials and Energy Research Center. She worked as a research scientist in area includes materials and nanomaterials characterization in the Fuel cell, batteries and photo catalyst systems.Aida FaeghiniaDr. Aida Faeghinia, is currently associate Professor at Materials and Energy Research Center.Abouzar MassoudiDr. Abouzar Massoudi, is currently assistant Professor at Materials and Energy Research Center.
摘要采用水热法制备了Li3OCl固体电解质。为了考察水对Li3OCl相稳定性的影响和减少二次氢氧化物相的数量,在合成过程中向前驱体中加入不同摩尔比的水。XRD、DSC、FE-SEM、EIS和CV等技术表明,LiCl: LiOH: H2O(1:2:10)的摩尔比具有较好的相稳定性和较少的不需要的氢氧化物相。DSC结果还表明,在第一次热处理循环中,Lix(OH)yClz相转变为Li3OCl相。热处理后的最终结构为玻璃陶瓷结构。在60°C和110°C时,合成的Li3OCl离子电导率分别达到5.0 × 10−2 mS cm−1和0.76 mS cm−1。合成的Li3OCl在60 ~ 110℃温度范围内的活化能为0.27 eV。在130°C下,从−1.5 V到4 V的锂化/脱氧过程中,证实了合成的Li3OCl的化学稳定性。关键词:抗钙钛矿电化学稳定性水热合成氢氧相固体电解质感谢伊朗材料与能源研究中心对这项工作的支持。披露声明作者未报告潜在的利益冲突。研究、材料准备、实验部分、数据收集、数据解释和原创稿件撰写由Aref Ghanbari完成。监督,资金获取,概念化,结果解释,手稿审查和出版版本批准由Zahra Khakpour进行。监督、方法和资金获取由Aida Faeghinia和Abouzar Massoudi完成。所有作者都已阅读并同意稿件的出版版本。数据可用性声明所有数据和分析均可根据要求提供。没有来自政府、商业或非营利部门的资助机构为这项研究提供任何特定的资助。没有来自政府、商业或非营利部门的资助机构为本研究提供任何特定的资助。作者简介:aref Ghanbari,陶瓷系材料与能源研究中心博士生。本文主要研究固态锂离子电池的储能问题。Zahra KhakpourDr。Zahra Khakpour,通讯作者,材料与能源研究中心助理教授。她的研究领域包括燃料电池、电池和光催化剂系统中的材料和纳米材料表征。Aida FaeghiniaDr。Aida Faeghinia,现任材料与能源研究中心副教授。Abouzar MassoudiDr。Abouzar Massoudi,现任材料与能源研究中心助理教授。
{"title":"Investigating the amount of water on reducing Li <sub>x</sub> (OH) <sub>y</sub> Cl <sub>z</sub> hydroxide phases in the synthesis of Li <sub>3</sub> OCl anti-perovskite as a solid electrolyte in Li-ion batteries","authors":"Aref Ghanbari, Zahra Khakpour, Aida Faeghinia, Abouzar Massoudi","doi":"10.1080/15567036.2023.2275710","DOIUrl":"https://doi.org/10.1080/15567036.2023.2275710","url":null,"abstract":"ABSTRACTThe Li3OCl solid electrolyte was synthesized in the present study via the hydrothermal method. In order to investigate the effect of water on the stability of the Li3OCl phase and reduce the amount of secondary hydroxide phases, different molar ratios of water were added to the precursors during the synthesis procedures. Employing XRD, DSC, FE-SEM, EIS, and CV techniques revealed that the LiCl: LiOH: H2O (1:2:10) molar ratio has better phase stability and fewer undesired hydroxide phases. The DSC results also showed that during the first heat treatment cycle, the Lix(OH)yClz phases were converted to the Li3OCl phase. After heat treatment, the final structure was characterized as a glass-ceramic structure. At 60°C and 110°C, respectively, the synthesized Li3OCl reached an ionic conductivity of 5.0 × 10−2 mS cm−1 and 0.76 mS cm−1. Also, the activation energy of 0.27 eV in the 60–110°C temperature range was recorded for the synthesized Li3OCl. The chemical stability of the synthesized Li3OCl was confirmed during lithiation/delithiation from −1.5 to 4 V at 130°C.KEYWORDS: Anti-perovskiteelectrochemical stabilityhydrothermal synthesishydroxide phasessolid electrolytes AcknowledgementsWe thank the Materials and Energy Research Center, Iran, for the support of this work.Disclosure statementNo potential conflict of interest was reported by the author(s).Author contributionsResearch, material preparation, experimental sections, data collection, data interpretation, and original manuscript writing were done by Aref Ghanbari. Supervision, funding acquisition, conceptualization, results interpretation, manuscript reviewing, and publication-version approval are conducted by Zahra Khakpour. Supervision, methodology, and funding acquisition were done by Aida Faeghinia and Abouzar Massoudi.All authors have read and agreed to the published version of the manuscript.Data availability statementAll data and analysis are available upon request.Additional informationFundingNo funding institutions from the governmental, commercial, or nonprofit sectors contributed any specific grants for this study. No funding institutions from the governmental, commercial, or nonprofit sectors contributed any specific grants for this study.Notes on contributorsAref GhanbariAref Ghanbari, P.h.D student at Materials and Energy Research Center, Ceramic Department. The thesis is concerned with the energy storage, and Li-ion solid state batteries problems.Zahra KhakpourDr. Zahra Khakpour, is the corresponding author and is an assistant professor at Materials and Energy Research Center. She worked as a research scientist in area includes materials and nanomaterials characterization in the Fuel cell, batteries and photo catalyst systems.Aida FaeghiniaDr. Aida Faeghinia, is currently associate Professor at Materials and Energy Research Center.Abouzar MassoudiDr. Abouzar Massoudi, is currently assistant Professor at Materials and Energy Research Center.","PeriodicalId":11580,"journal":{"name":"Energy Sources, Part A: Recovery, Utilization, and Environmental Effects","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135949819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A modified fractional‑order-based future search algorithm for performance enhancement of a PEMFC-based CCHP 改进的基于分数阶的未来搜索算法,用于增强基于pemfc的CCHP的性能
Pub Date : 2023-10-02 DOI: 10.1080/15567036.2023.2276385
Biao Lu, Navid Razmjooy
ABSTRACTLoad control and cost optimization are considered to be crucial in tri-generation or combined cooling, heating, and power (CCHP) systems. In this study, an inventive CCHP system employs an FC system as its first mover and includes a heat exchanger, a heat recovery, as well as an auxiliary boiler, an electric chiller, and an absorption chiller. The electrical grid is linked to this system. The idea here is to maximize the system’s performance from a financial perspective and to make the annual expenditure of the system minimum over a 20–year period that is considered as the cycle life-span. It is a multi-objective optimization problem which is optimized using a newly introduced metaheuristic optimization method and a Fractional-order future search optimizer. The findings of this study are used to divine an ideal configuration of the CCHP. Finally, to demonstrate the higher efficiency of the suggested method, a comparison should be conducted among the optimization results of the fractional-order-based future search algorithm, the results of Non-dominated Sorting Genetic Algorithm II (NSGA-II), and standard future search algorithms in previous studies. Based on the results presented, the proposed Fractional-order Future Search Algorithm (FOFSA) was able to optimize the performance of a PEMFC-based CCHP system more effectively than conventional methods. The system’s exergy efficiency was found to decrease from 52% at 793 mA/cm2 current density to 36% at 1000 mA/cm2 current density. However, with the application of FOFSA, the suggested optimal system had a higher exergy efficiency of 41.6% and a yearly cost of $2765, resulting in the maximum annual greenhouse gas (GHG) reduction of 4.48E6 g. Therefore, in summary, the proposed FOFSA yielded an optimized CCHP system configuration that had higher energy efficiency, lower annual cost, and reduced GHG emissions. These findings highlight the effectiveness of the FOFSA method in optimizing the performance of PEMFC-based CCHP systems.KEYWORDS: Combined heatingcoolingand power cycle; proton exchange membranefuel cell; economic performanceannual cost; fractional-order future search algorithm Nomenclature Symbol=ExplanationCCHP=Combined cooling, heating, and powerNSGA-II=Non-dominated Sorting Genetic Algorithm IIFOFSA=Fractional-order Future Search AlgorithmGHG=Greenhouse gasIMPO=Improved marine predators optimizerPROX=Preferential oxidationPCM=Phase change materialDAC=Desiccant air conditioningHX=Heat-exchangerMEA=Membrane-electrode assemblyNs=The connected cells’ quantityEN=The open-circuit Nernst relation (V)Vloss=The overall voltage loss (V)Vcon=Concentration loss (V)Vact=Activation loss (V)VΩ=Ohmic loss (V)EN=The stack output voltage (V)E0=The open-circuit voltage of the cell (V)F=The Faraday’s constant (C/mol)R=The universal gas constant (J/mol.K)T=The operating temperaturePO2=The partial pressure of O2 (Pa)PH2=The partial pressure of H2 (Pa)PH2Oc=The partial pressure of steam (Pa)Rhc=The vapor re
摘要负荷控制和成本优化被认为是三电或冷热电联产(CCHP)系统的关键。在本研究中,一种创新的热电联产系统采用FC系统作为原动机,包括热交换器、热回收、辅助锅炉、电冷冻机和吸收式冷冻机。电网与这个系统相连。这里的想法是从财务角度最大化系统的性能,并使系统的年度支出在20年的周期内达到最低,这被认为是循环寿命。它是一个多目标优化问题,采用新引入的元启发式优化方法和分数阶未来搜索优化器进行优化。本研究的结果用于预测CCHP的理想配置。最后,将基于分数阶的未来搜索算法的优化结果与非支配排序遗传算法II (non - dominant Sorting Genetic algorithm II, NSGA-II)的优化结果与前人研究的标准未来搜索算法的优化结果进行比较,以证明所提方法的更高效率。基于上述结果,所提出的分数阶未来搜索算法(FOFSA)能够比传统方法更有效地优化基于pemfc的CCHP系统的性能。系统的火用效率从793 mA/cm2电流密度时的52%下降到1000 mA/cm2电流密度时的36%。然而,应用FOFSA后,建议的最优系统的火用效率更高,达到41.6%,年成本为2765美元,最大年温室气体(GHG)减少4.48E6 g。综上所述,所提出的FOFSA产生了一个优化的CCHP系统配置,具有更高的能源效率,更低的年成本,并减少了温室气体排放。这些发现突出了FOFSA方法在优化基于pemfc的CCHP系统性能方面的有效性。关键词:热冷联产;质子交换膜燃料电池;经济效益年成本;分数阶未来搜索算法名称符号=解释cchp =联合冷却、加热、nsga - ii =非支配排序遗传算法IIFOFSA=分数阶未来搜索算法ghg =温室气体impo =改进的海洋捕食者optimizerPROX=优先氧化pcm =相变材料dac =干湿空调hx =热交换器mea =膜电极组装ns =连接细胞的数量EN=开路能量关系(V)Vloss=总电压损耗(V)Vcon=浓度损耗(V)Vact=激活损耗(V)VΩ=欧姆损耗(V)EN=堆叠输出电压(V)E0=电池开路电压(V)F=法拉第常数(C/mol)R=通用气体常数(J/mol. k)T=工作温度po2 = O2分压(Pa)PH2= H2分压(Pa)PH2Oc=蒸汽分压(Pa)Rhc=阴极中的蒸气相对湿度ha=阳极中的蒸气相对湿度i = FC的工作电流(A)A= FC的膜活性面积(m2)PC=阴极电极的入口分压(PC) Pa =阴极的入口分压阳极电极(Pa)Rc=连接电阻(kΩ)Rm=膜电阻(kΩ)ρm=膜电阻率(Ω.m)l=膜厚度(m)λ=可变变量lei =燃料电池堆电流(A)I0=极限电流(A)n=电荷传递系数bm=传质电压(V)ηex=系统的火用效率ypcchp =系统中产生的电能exe =提供的冷却火用exhw =提供的热水火用excchp =消耗的燃料火用sh2 = H2的化学计量;rh2 =燃料消耗的摩尔速率(mol。
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引用次数: 0
The impact of various catalysts on pyrolysis bio-oil characteristics and catalyst coking behavior of corn stover 各种催化剂对玉米秸秆热解生物油特性和催化剂结焦行为的影响
Pub Date : 2023-10-02 DOI: 10.1080/15567036.2023.2276902
Qi Zhang, Deli Zhang, Zhijing Sun, Fang Wang, Jiaqi Zhang, Rui Ma, Weiming Yi
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引用次数: 0
A critical review on the various techniques for the thermal performance improvement of solar air heaters 改进太阳能空气加热器热性能的各种技术综述
Pub Date : 2023-10-02 DOI: 10.1080/15567036.2023.2264228
S. A. Kedar, Ganesh Vijay More, D. S. Watvisave, H. M. Shinde
ABSTRACTSolar air heating system plays an important role in industries. However, in the solar air heating system efficiency considered as important parameters of the solar thermal systems, in particular, the solar air heaters (SAHs) system efficiency is quite low because of the inherent properties of air. The inherent properties include the formation of viscous sublayer, poor heat carrying capacity, etc. The active and passive approaches have been conceded to lessen this problem. The most promising approach is passive because of hassle-free operations. The best passive approaches have been placing ribs, baffles, fins, winglets, etc., on the heat-absorbing surface of SAHs to break the viscous sublayer and promote turbulence. In the present study, various ribs and baffles profiles have been summarized so that they can be used for future research. Along with that, this paper mainly focuses on the need for solar air heating for industrial applications. The performance of SAHs in terms of thermo-hydraulic performance (THP) and thermal and effective efficiencies has been studied and compared for ribs and baffles. Use of fins on the absorber plate and different surface geometries of the absorber plate enhanced the rate of heat transfer during the sunshine hours and use of phase change material for the supply of heat energy during off-sunshine hours. As a result, maximum thermal efficiency of SAHs having ribs, baffles and fins has been found to be 81.9% but the effective efficiency is 28.3% because of large friction factor. Solar air heaters mainly gain popularity in the wide range of industrial applications.KEYWORDS: Bafflesribscorrelationsthermal and effective efficiencythermohydraulic performance Nomenclatures Ap=Area of absorber plate (m2)Cp=Specific heat of air at bulk mean temperature. J/kg KDh=Hydraulic diameter (m)e=Rib/baffle height (m)fs=Friction factor of smooth surfacefr=Friction factor of roughened surfaceH=Duct height (m)h=Heat transfer coefficient (W/m2KI=Heat insolation (W/m2)k=Thermal conductivity of air (W/mK)m=Mass flow rate of air (Kg/s)L=Duct length (m)Nus=Nusselt number of smooth surfaceNur=Nusselt number of roughened surfaceP=Pitch of roughness (m)Pr=Prandtl numberHrrp=Relative rib pitchHrbp=Relative baffle pitch(△p)=Pressure drop (Pascal)Re=Reynolds numberTa=Ambient temperature (k)Tp=Plate temperature (k)Ti=Inlet air temperature (k)To=Outlet air temperature (k)Tsa=Temperature of fluid inside duct (k)Tsun=Sun Temperature (k)W=Duct width (m)Greek Symbols=ρ=Density (kg/m3)μ=Dynamic Viscosity (N.s/m2)α=Angle of attack (0)εp=Emissivity of absorber plateεg=Emissivity of glass sheetτaab=Product of transmittance–absorptanceDisclosure statementNo potential conflict of interest was reported by the author(s).Additional informationNotes on contributorsS. A. KedarS. A. Kedar is an Assistant Professor at Mechanical Engineering from MKSSS’s Cummins College of Engineering for Women, Karvenagar Pune. He completed a Master’s degree in Energy Studie
摘要太阳能空气加热系统在工业中起着重要的作用。然而,在作为太阳能热系统重要参数的太阳能空气加热系统中,由于空气的固有特性,太阳能空气加热器(SAHs)系统效率很低。其固有特性包括形成粘性亚层、热承载能力差等。为了减轻这一问题,已经承认了主动和被动的方法。最有希望的方法是被动的,因为它的操作没有麻烦。最好的被动方法是在SAHs的吸热表面放置肋、挡板、鳍、小翼等,以打破粘性亚层,促进湍流。在本研究中,对各种肋板和挡板的外形进行了总结,以便于今后的研究。与此同时,本文主要关注工业应用对太阳能空气加热的需求。对肋板和挡板的热水力性能、热效率和有效效率进行了研究和比较。在吸收板上使用翅片和吸收板的不同表面几何形状提高了日照时的传热率,并在非日照时使用相变材料提供热能。结果表明,带有肋、挡板和翅片的SAHs的最大热效率为81.9%,但由于摩擦系数大,其有效效率为28.3%。太阳能空气加热器主要在广泛的工业应用中得到普及。关键词:折流板;关联度;热效率和有效效率;热工性能;命名法Ap=吸收板面积(m2);J/kg KDh=水力直径(m)e=肋/挡板高度(m)fs=光滑表面摩擦系数efr=粗糙表面摩擦系数h=风道高度(m)h=换热系数(W/m2KI=热辐照(W/m2)k=空气导热系数(W/mK)m=空气质量流量(kg /s)L=风道长度(m)Nus=光滑表面努瑟尔数enur =粗糙表面努瑟尔数ep =粗糙度节距(m)Pr=普朗特数hrrp =相对肋节距hrbp =相对挡板节距(△p)=压降(帕罗)Re=雷诺数numberTa=环境温度(k)Tp=板温(k)Ti=进风温度(k)To=出风温度(k)Tsa=风道内流体温度(k)Tsun=太阳温度(k)W=风道宽度(m)希腊符号=ρ=密度(kg/m3)μ=动态粘度(N.s/m2)α=迎角(0)εp=吸收板发射率εg=玻璃板发射率τaab=透射-吸收积披露声明作者未报告潜在的利益冲突。附加信息:关于贡献者的说明。答:棚。A. Kedar是位于浦那Karvenagar的MKSSS康明斯女子工程学院机械工程助理教授。他在浦那s.p. Pune University获得能源研究硕士学位。他在印度科内鲁·拉克什迈亚教育基金会(被认为是印度大学)完成了机械工程博士学位。主要研究领域为太阳能热能、可再生能源、热能工程。他有14年的教学经验和1年的工业经验。Ganesh Vijay More目前在PVG工程技术学院和G. K. Pate (Wani)管理学院(印度浦那)机械工程系担任助理教授。他拥有印度Vaddeswaram大学Koneru Lakshmaiah教育基金会的机械工程博士学位,以及印度巴拉马蒂的Vidya Pratishthan的Kamalnayan Bajaj工程与技术研究所的硕士学位。他有6年的研究和学术经验。美国WatvisaveD。S. Watvisave目前在普纳康明斯女子工程学院机械工程系担任副教授。他拥有印度理工学院波梅分校的热学和流体博士学位以及浦那COEP理工大学的硕士学位。他拥有28年的工业、研究和学术经验。m . ShindeH。他于2005年获得浦那理工大学COEP机械工程学位。随后在2013年获得了机械工程(汽车工程)硕士学位。随后于2022年在普纳大学获得机械工程博士学位。他目前受聘为浦那大学康明斯女子工程学院机械工程系助理教授。他的研究兴趣集中在汽车技术和能源方面。
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引用次数: 0
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Energy Sources, Part A: Recovery, Utilization, and Environmental Effects
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