检索结果-南通市图书馆

Experimental Investigation on an Absorption Heat Transformer for Production of Hot Water or Steam Generation

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2021年第2期30卷 574-584页

作者： LIU Feng JING Yang LIU Taixiu SUI Jun xu yujie Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Shandong Urban and Rural Planning Design Institute Jinan 250013China

The absorption heat transformer is widely used to utilize low-temperature waste heat in the field of distributed energy,industrial processing,and long-distance indoor heating,because it can upgrade energy level and deliver heat to heated *** this work,an experimental system of a vertical single-stage LiBr/H2O absorption heat transformer was established to study its performance in the case of producing high-temperature water or low-pressure steam generation under different heating water flow *** useful output heat,coefficient of performance,exergy coefficient of performance,and gross temperature lift of the single-stage heat transformer have all been *** results show that the absorber cannot directly generate low-pressure steam under the condition of counter-flow heat exchange but can obtain more useful output *** largest useful output heat is 20.3 kW,which is higher than that in the case of parallel-flow heat *** generation of low-pressure steam has certain requirements on the mode of heat *** largest internal gross temperature lift of 28.1℃corresponds to the smallest coefficient of performance of 0.22 when the heating water flow rate is 2.1 m3/*** performance of the single-stage absorption heat transformer can be improved to some extent by increasing the heating water flow rate.

关键词： vertical falling film absorber counter flow and parallel flow high-temperature water low-pressure steam exergy coefficient of performance

Bio-inspired Trajectory Tracking Algorithm based on SFLOS for USV 36

在线全文

学校读者我要写书评

暂无评论

Bio-inspired Trajectory Tracking Algorithm based on SFLOS fo...

A Variable Coefficient Nonsingular Fast Terminal Sliding Mode Control Method Based on ESO 36

第36届中国控制会议

作者： Mingyu Fu Li Zhou yujie xu College of Automation Harbin Engineering University

ISBN: (纸本)9781538629185

In this paper,a novel guidance-control scheme is presented for the unmanned surface vessel（USV） trajectory ***,the guidance system is designed to give the reference speed and heading for the control *** on the SFLOS algorithm,the guidance system can track the desired curve in high ***,control system is proposed based on backstepping technique and bio-inspired neural dynamics *** the characteristics of the neural dynamics model,the more smooth control law is ***,the closed-loop system can be proved to be globally asymptotically stable based on cascaded system stability *** demonstrate the effectiveness of the proposed method.

关键词： Bio-Inspired trajectory tracking USV SFLOS Backstepping technique

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

A Variable Coefficient Nonsingular Fast Terminal Sliding Mod...

Thermo-Economic Modeling and Evaluation of Physical Energy Storage in Power System

第36届中国控制会议

作者： Mingyu Fu Hongyan Wei yujie xu College of Automation Harbin Engineering University

ISBN: (纸本)9781538629185

This paper presents a variable coefficient nonsingular fast terminal sliding mode（VCNFTSM） control method with the extended state observer（ESO） for a class of second-order uncertain SISO nonlinear systems subject to external ***,a new variable coefficient double exponential reaching law is combined with NFTSM surface function to get finite time fast convergence in both reaching phase and sliding ***,the system uncertainty and external distractions are estimated and compensated effectively by introducing the ***,it is proved theoretically that the controller based on ESO can make the nonlinear system states converge to a small neighborhood around the equilibrium in finite ***,simulation results show that the proposed control algorithm can not only shorten the system reaching time and improve the system control precision but also reduce system chattering effectively.

关键词： Finite time control Variable coefficient reaching law NFTSM ESO

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Thermal Science 2021年第6期30卷 1861-1874页

作者： HU Shan LIU Chang DING Jie xu yujie CHEN Haisheng ZHOU xuezhi Institute of Engineering Thermophysics Chinese Academy of ScienceBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China National Energy Large Scale Physical Energy Storage Technologies R&D Center Bijie 551712China

In order to assess the electrical energy storage technologies,the thermo-economy for both capacity-type and power-type energy storage are comprehensively investigated with consideration of political,environmental and social *** for the first time,the Exergy Economy Benefit Ratio(EEBR)is proposed with thermo-economic model and applied to three different storage systems in various scenarios,including pumped storage,compressed air energy storage and flywheel energy *** impact of the total system efficiency,annual utilization hour,life time,and other key factors are also *** results show that the EEBRs of pumped storage and compressed air energy storage under peak load shaving condition and flywheel energy storage under frequency modulation service condition are all larger than zero,which means they are all thermo-economically *** extra consideration of political,environmental and social impact,the exergy cost could reduce by about 25%and the EEBR *** sensitivity analysis indicates the similarity and diversity of influence to EEBR between capacity-type and power-type energy storage *** former is that energy efficiency is the dominated factor for all three storage *** latter is that the difference of exergy benefit mode causes variety in other major *** energy-type storage system,like pumped storage and compressed air storage,the peak-to-valley price ratio is very sensitive in energy *** power-type storage system,like flywheel storage,the mileage ratio is in leading position in auxiliary service benefit by *** the three cases studied,the pumped storage has the best thermo-economy;the compressed air energy storage is the second,and the flywheel energy storage is the *** main reason is that the pumped storage has the least non-exergy cost,and flywheel has the most.

关键词： physical energy storage system thermo-economy exergy economy benefit ratio capacity-type energy storage power-type energy storage

Economic Analysis of using Above Ground Gas Storage Devices for Compressed Air Energy Storage System

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2014年第6期23卷 535-543页

作者： LIU Jinchao ZHANG Xinjing xu yujie CHEN Zongyan CHEN Haisheng TAN Chunqing Institute of Engineering Thermophysics Chinese Academy of Sciences University of Chinese Academy of Sciences

Above ground gas storage devices for compressed air energy storage(CAES) have three types:air storage tanks,gas cylinders,and gas storage pipelines.A cost model of these gas storage devices is established on the basis of whole life cycle cost(LCC) *** optimum parameters of the three types are determined by calculating the theoretical metallic raw material consumption of these three devices and considering the difficulties in manufacture and the influence of gas storage device *** LCCs of the three types are comprehensively analyzed and *** result reveal that the cost of the gas storage pipeline type is lower than that of the other two *** study may serve as a reference for designing large-scale CAES systems.

关键词： above ground gas storage device economic analysis life cycle cost analysis

Performance in the Discharge Process of a Novel Zeolite-Water Adsorption Thermal Energy Storage System

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2023年第4期32卷 1626-1634页

作者： YUE Xiuyan xu yujie ZHOU xuezhi ZHANG Xinjing LINGHU Youqiang WANG Xiang CHEN Haisheng Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China National Energy Large Scale Physical Energy Storage Technologies R&D Center(Bijie) Bijie551712China

In order to effectively recover low and medium grade heat energy,a novel combined cooling and heating storage system based on zeolite-water is proposed in this *** system coupled the zeolite-water adsorption process with the water evaporation refrigeration process during discharging process to realize generating cold energy and heat energy simultaneously.A more accurate kinetic model of zeolite and water adsorption is developed,and the thermodynamic performance of discharging process of the system is numerically *** results show the system has the higher energy conversion coefficient of 1.49 and the higher energy density of 1216.6 kJ/*** change laws of system performances,such as energy generated,energy conversion coefficient and energy density,with key parameters during discharging process are *** study provides a way for efficient utilization of low and medium grade heat energy.

关键词： zeolite-water adsorption thermal energy storage combined cooling and heating discharging process kinetic model

Influence of built environment and user experience on the waterfront vitality of historical urban areas: A case study of the Qinhuai River in Nanjing, China

在线全文

学校读者我要写书评

暂无评论

Frontiers of Architectural Research 2023年第5期12卷 820-836页

作者： Jie Ding Lianjie Luo Xin Shen yujie xu School of Art&Design Nanjing Forestry UniversityNanjing 210037China School of Art Anhui University of Finance&EconomicsBengbu233030China

Urban waterfronts are important gateways that reflect a city’s image and *** waterfront vitality and its influencing factors is critical for guiding urban waterfront planning and *** human movement data,provided by the Baidu Heatmap,were used to explore the weekday and weekend urban vitality spatial distribution characteristics of the waterfronts of the Qinhuai River in ***(ordinary least squares)and local(multiscale geographically weighted regression)models revealed the influence of physicaleenvironmental characteristics(objective)and spatial experience evaluation factors(subjective)on urban vitality.(1)The Qinhuai River waterfront urban vitality agglomeration characteristics were similar between weekdays and weekends,and the core vitality areas were distributed in the dense tourism,commercial,and residential areas along the river.(2)The evaluation of catering experience had the strongest positive correlation with vitality,whereas the waterfront distance had the strongest negative correlation.(3)The influence of each factor on waterfront vitality in the study area exhibited considerable spatial differences,with attenuation trends observed from the east-to-west river *** study shows the urban vitality distribution characteristics of the Qinhuai River waterfront *** the influence of physicaleenvironmental and spatial evaluation factors on the vitality distribution can provide a scientific basis and reference for urban waterfront planning and redevelopment focusing on cultivating vitality.

关键词： Waterfront space Urban vitality Physical environment Emotional experience Big data

Increasing Coal-Fired Power Plant Operational Flexibility by Integrating Solar Thermal Energy and Compressed Air Energy Storage System

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2023年第6期32卷 2032-2047页

作者： LI Xiaoyu WANG Yumeng ZHANG Xinjing LI Bin xu yujie CHEN Haisheng SHENG Siqing Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBaoding071003China School of Electrical and Electronic Engineering North China Electric Power UniversityBaoding071003China

This paper proposed a novel integrated system with solar energy,thermal energy storage(TES),coal-fired power plant(CFPP),and compressed air energy storage(CAES)system to improve the operational flexibility of the CFPP.A portion of the solar energy is adopted for preheating the boiler’s feedwater,and another portion is stored in the TES for the CAES discharging *** water from the CFPP condenser is used for cooling compressed air during the CAES charging *** thermodynamic performance of the integrated system under different load conditions is *** system operations in a typical day are simulated with EBSILON *** system enables daily coal saving of 9.88 t and reduces CO_(2)emission by 27.95 t compared with the original CFPP at 100%*** partial load conditions,the system enables maximum coal saving of 10.29 t and maximum CO_(2)emission reduction of 29.11 t at 75%*** system has maximum peak shaving depth of 9.42%under 40%load *** potential of the system participating ancillary service is also *** is found that the integration of solar thermal system and CAES system can bring significant ancillary service revenue to a conventional CFPP.

关键词： solar thermal compressed air energy storage coal-fired power plant thermal energy storage operation flexibility ancillary service

Path-Following Control of an Underactuated Hovercraft with Dynamic Uncertainties under Serret-Frenet Frame 36

在线全文

学校读者我要写书评

暂无评论

Path-Following Control of an Underactuated Hovercraft with D...