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Research on Operation Optimization of Heating System Based on Electric Storage co.pled Solar Energy and Air Source Heat Pump

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Energy Engineering 2023年第9期120卷 1991-2011页

作者： Jingxiao Han Chuanzhao Zhang LuWang ZengjunChang Qing Zhao Ying Shi JiaruiWu Xiangfei Kong Technical management Department Beijing District Heating Group Co.Ltd.Beijing100028China co.lege of Biochemical Engineering Beijing Union UniversityBeijing100032China School of Energy and Environmental Engineering Hebei University of TechnologyTianjin300401China Technology Research and Development Department Beijing Heating Project Design Co.Ltd.Beijing100071China Digital Intelligence Technology Center China Railway Group Mechanical and Electrical Installation Co.Ltd.Beijing100049China

For heating systems based on electricity storage co.pled with solar energy and an air source heat pump(ECSA),choosing the appropriate co.bination of heat sources acco.ding to local co.ditions is the key to improving eco.omic *** this paper,four cities in three climatic regions in China were selected,namely nanjing in the hot summer and co.d winter region,Tianjin in the co.d region,Shenyang and Harbin in the severe co.d winter *** levelized co.t of heat(Lco.)was used as the eco.omic evaluation index,and the energy co.sumption and emissions of different pollutants were *** software was used to simulate and analyze the system *** Hooke-Jeeves optimization algorithm and GenOpt software were used to optimize the system *** results showed that ECSA systemhad an excellent operation effect in co.d region and hot summer and co.d winter *** with ECS system,the systemenergy co.sumption,and the emission of different pollutants of ECSA system can be reduced by a maximum of 1.37 *** co.d region,the initial investment in an air source heat pump is higher due to the lower ambient temperature,resulting in an increase in the LOCH value of ECSA *** the LOCH value of ECSA system in each region was optimized,the heating co.t of the system was reduced,but also resulted in an increase in energy co.sumption and the emission of different pollutant gases.

关键词： Electric heat storage solar energy air source heat pump multi-objective optimization method LOCH

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The co.pled Effect of Temperature Changes and Damage Depth on Natural Frequencies in Beam-Like Structures

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Structural Durability & Health Monitoring 2022年第1期16卷 15-35页

作者： Tareq Al-hababi Nizar Faisal Alkayem Li Cui Shixiang Zhang co.g Liu Maosen Cao Anhui Provincial International Joint Research Center of Data Diagnosis and Smart Maintenance on Bridge Structures Chuzhou UniversityChuzhou239000China Department of Engineering Mechanics Hohai UniversityNanjing210098China co.lege of Civil and Transportation Engineering Hohai University Nanjing210098China co.lege of Civil and Architecture Engineering Chuzhou UniversityChuzhou239000China China Design group co. Ltd.Nanjing210014China Jiangsu Zhongqiao Technology Research co. Ltd.Nantong226000China

A significant amount of research is co.cerned with dynamic modal parameters for damage detection of structural co.ditions due to their simplicity in use and ***,their use for damage detection should be performed with special attention,particularly in operational and environmental co.ditions subjected to temperature *** in construction industries experience different loading types,such as temperature changes leading to crack initiation and *** physical and dynamic properties such as natural frequencies and mode shapes indicate that damage has occurred within the *** this study,vibration analysis of cantilever and cantilever simply supported beams has been carried out on intact and damaged beams to investigate the co.pled effect of temperature changes and damage depth on natural frequencies.A numerical analysis of beams is co.pleted using ANSYS *** results of numerical simulation are validated using two other studies from *** results revealed that in order to perform a successful damage assessment using the frequency shift,the vibration modes should be selected *** addition,an increase in temperature results in a decrease in structural *** assessment of the effect of damage depth on natural frequencies also co.firms that when damage depth is increased,there is a significant decrease in natural frequency responses.

关键词： Temperature effect damage depth natural frequency beam damage detection modal analysis

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Climate Services for Water Resource management in China: The Case Study of Danjiangkou Reservoir

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Journal of Meteorological Research 2021年第1期35卷 87-100页

作者： Yujie WANG Xiang LI Song LIU Zhenyu HAN Lianchun SONG Zongjian KE Keyao CHEN Key Laboratory of Meteorological Disaster Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science&TechnologyNanjing 210044 School of Atmospheric Sciences Nanjing University of Information Science&TechnologyNanjing 210044 National Climate Center China Meteorological AdministrationBeijing 100081 Hanjiang Water Resources&Hydropower group co. Ltd.Wuhan 430000

The efficiencies and effectiveness of water resource management are inextricably linked to climate services. This study demonstrates a climate information service for Danjiangkou Reservoir, which is the largest artificial lake in Asia, facing mounting challenges for flood co.trol, water storage, and water diversion. Unlike traditional water resource management on the basis of short-term weather forecast and runoff monitoring, subseasonal to seasonal(S2S)and annual climate predictions as well as long-term climate change projections were well used to support the decision makers in Danjiangkou Reservoir. The National Climate Center(NCC) has projected the changes of future climate and extreme events by dynamically downscaling the co.pled Model Interco.parison Project phase 5(CMIP5)projections to 25-km resolution for the long-term planning of water resource management in Danjiangkou ***-time climate predictions based on climate models and downscaling interpretation and application methods at different timescales were also provided to meet the specific needs of earlier predictions and spatial refinement for the short-term diversion of the reservoir. Our results show that such climate services facilitated the Diversion Center of Danjiangkou Reservoir(DCDR) to reasonably co.trol the operational water level, increased the eco.ogical water supply to the northern portion of China by 844 million m^(3), and reduced as much as 1.67 billion m^(3) of abandoned water in 2019. In the future, it is necessary to develop climate prediction methods to increase spatial and temporal resolutions and prediction skills, and enhance interactions between providers and users.

关键词： climate service water resource management climate prediction climate projection reservoir

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World’s first implementation of close-fit pipe jacking of twin tunnels for construction of subway station--Innovation in equipment and construction technology

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Frontiers of Engineering management 2024年第2期11卷 369-376页

作者： Xiangsheng CHEN Bo SUN Wei LI Yongzhao WU Wenpeng ZHOU Meng FENG Lei WANG Wensheng YANG Xiang WU Weiyi LONG Dong SU Shenzhen Univeristy Shenzhen 518060China Shenzhen Metro group co. Ltd.Shenzhen 518031China Shenzhen Municipal Design&Research co. Ltd.Shenzhen 518000China Sinohydro Bureau 11 co. Ltd.Zhengzhou 450001China China Railway Engineering Equipment group co. LTD.Zhengzhou 450000China Shenzhen University Shenzhen 518060China

1 Project overview The Shasan station of Phase II of Shenzhen’s urban rail transit Line 12 is situated in Bao’an District,*** co.prises a two-level underground island platform station,measuring 212 m in length,and 22.6 m in width,with an overburden thickness of about 7.0 ***.1 illustrates the presence of a large underground reinforced co.crete stormwater culvert,measuring 11.5 m by 3.6 m,traversing the station’s center.

关键词： Subway station close-fit pipe jacking of twin tunnels modular rectangular pipe jacking machine Structural Transformation equipment construction

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Optimizationof Design co.cept of construction for Railway Passenger Stations in New Era

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Chinese Railways 2022年第1期 3-7页

作者： WANG Feng construction management Department of China State Railway group co.Ltd.(CHINA RAILWAY)

The co.cept of building up a“well-co.nected fully-integrated,enviomentfriendly,passenger-oriented,eco.omic-efficient,culturally-rich,intelligent and A co.venient”station has been being applied to practice in recent *** State Railway group *** .(hereinafier referred to as CHINA RAILWAY)and the Academyof Arts&Design,Tsinghua University have jointly initiated a series of study projects around the topic of“cultural and artistic expression”aiming to optimize design co.cepts and explore the design aesthetics of China's railway passenger stations in *** projects have achieved some positive results and this paper aims to provide a better analysis of the design co.cept of railway passenger stations in the new era through ananalysis of those stations' design aesthetic.

关键词： high speed railway passenger stationi image user study space media designa esthetics

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Modification of mud properties of slurry shield under the intrusion of Ca2 + in sea area

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Yantu Lixue/Rock and Soil Mechanics 2020年 41卷 423-430页

作者： Zhang, Yang Zhong, Xiao-Chun Sun, Jin-Xin Fu, Wei Luo, Jin-Hai Deng, You-Chun co.lege of Civil and Transportation Engineering Hohai University Nanjing210098 China China Railway First group co. Ltd. Xi'an710068 China

In order to solve the problem of mud performance deterioration caused by Ca2+ intrusion under construction of undersea tunnel by slurry shield, laboratory tests were carried out on mud with swelling ratio of 1:12 under Ca2+ intrusion based on the engineering of Xiamen metro line 3. The mud modification tests with sodium humate, soda ash, caustic soda and CMC were co.ducted as well. The effects of additives on slurry resistance to deterioration of high co.centration CaCl2 solution were studied by analyzing the mud properties such as bleeding rate, characteristic particle size and zeta potential etc. The results show that: (1) Soda ash has the best effect on the mud funnel visco.ity, while sodium humate and caustic soda can further increase the variation range of mud funnel visco.ity. (2) Soda ash can efficiently slow down the decline of mud zeta potential caused by intrusion of Ca2+. (3) Adding soda ash and CMC has a great influence on the characteristic particle size of mud intruded by Ca2+. Among them, soda ash makes the characteristic particle size basically co.sistent with that of slurry, while CMC can increase the change of characteristic particle size. (4) Sodium humate, soda ash and caustic soda can significantly reduce the bleeding rate of mud caused by Ca2+ intrusion, while CMC can increase the mud bleeding rate, which has a negative impact on the mud used in slurry shield tunneling. © 2020, Science Press. All right reserved.

关键词： Particle size

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Development of Subgrade Technical System for High-speed Railway

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Chinese Railways 2022年第2期 20-33页

作者： YOU Changlong Engineering management Center China State Railway Group Co.Ltd.

There are two phases in the development of China's high-speed railway after the1990s:the research and experiment phase during the Eighth and the Tenth Five-Year Plan periods;the construction and operation phase during the Eleventh and the Thirteenth Five-Year Plan *** paper regards the Beijing-Shanghai High-Speed Railway as the co.ner stone in the development of high-speed railway subgrade system,and proposes suggestions and solutions to the problems which may reduce the service life of *** solutions and methods can be referred to in future railway projects.

关键词： high-speed railway Beijing-Shanghai HSR technical system for subgrade subgrade vitality ground treatment settlement&deformation filler co.paction slope protection

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Dynamic Modeling Framework of Sediment Trapped by Check-Dam Networks:A Case Study of a Typical Watershed on the Chinese Loess Plateau

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Engineering 2023年第8期27卷 209-221页

作者： Pengcheng Sun Yiping Wu Key Laboratory of Degraded and Unused Land co.solidation Engineering the Ministry of Natural ResourcesShaanxi Provincial Land Engineering Construction Group Co.Ltd.Xi’an 710075China Key Laboratory of Soil and Water co.servation on the Loess Plateau of Ministry of Water Resources Yellow River Institute of Hydraulic ResearchZhengzhou 450003China Technology Innovation Center for Land Engineering and Human Settlement Shaanxi Provincial Land Engineering Construction Group Co.Ltd.&Xi’an Jiaotong UniversityXi’an 710115China

Check-dam construction is an effective and widely used method for sediment trapping in the Yellow River Basin and other places over the world that are prone to severe soil *** estimations of the dynamic sediment trapped by check dams are necessary for evaluating the effects of check dams and planning the construction of new *** this study,we propose a new framework,named soil and water assessment tool(SWAT)–dynamic check dam(DCDam),for modeling the sediment trapped by check dams dynamically,by integrating the widely utilized SWAT model and a newly developed module called *** then applied this framework to a typical loess watershed,the Yan River Basin,to assess the time-varying effects of check-dam networks over the past 60 years(1957–2016).The DCDam module generated a specific check-dam network to co.ceptualize the co.plex co.nections at each time step(monthly).In addition,the streamflow and sediment load simulated by using the SWAT model were employed to force the sediment routing in the check-dam *** evaluation results revealed that the SWAT-DCDam framework performed satisfactorily,with an overestimation of 11.50%,in simulating sediment trapped by check dams,when co.pared with a field survey of the accumulated sediment *** the Yan River Basin,our results indicated that the designed structural parameters of check dams have evolved over the past 60 years,with higher dams(37.14%and 9.22%increase for large dams and medium dams,respectively)but smaller co.trolled areas(46.03%and 10.56%decrease for large dams and medium dams,respectively)in recent *** retained by check dams co.tributed to approximately 15.00%of the total sediment load reduction in the Yan River during 1970–***,our developed framework can be a promising tool for evaluating check-dam effects,and this study can provide valuable information and support to decision-making for soil and water co.servation and check-dam planning and management.

关键词： Check dams Dynamic check dam(DCDam) Loess Plateau Sediment trapping SWAT

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Effects of slurry visco.ity and particle additive size on filter cake formation in highly permeable sand

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Underground Space 2022年第2期7卷 151-161页

作者： Zhikui Wang Yuan Wang Di Feng Jinhui Zhang Sijin Liu co.lege of Civil and Transportation Engineering Hohai UniversityNanjing 210098China co.lege of Water co.servancy and Hydropower Engineering Hohai UniversityNanjing 210098China State Key Laboratory of Hydrology-Water Resources and Hydraulic EngineeringHohai UniversityNanjing 210098China China Railway 14th Bureau group co Nanjing 210098China

Filter cake is critical to maintaining the stability of the excavation face of an underwater shield tunnel in a high-permeability *** a high-permeability formation,generating an effective filter cake on the excavation face is difficult with a pure bentonite slurry,which penetrates the ground and may not achieve the required suspension *** how to efficiently and quickly form a thin and low-permeability filter cake on the tunnel working face has beco.e a key engineering problem in the construction of slurry shield tunnels in high-permeability *** this study,the relationship between slurry visco.ity and the slurry pressure gradient of pure bentonite was established by performing slurry permeability *** influence of slurry visco.ity on the formation of the filter cake in a high-permeability formation was studied under different pressure *** addition,the effect of additive particle size on the slurry filter cake formation was analyzed by introducing additives with different particle sizes to pure bentonite slurries with different *** test results indicate that(1)for the pure bentonite slurry,the critical initial pressure gradient can be used as a rough indicator of the formation of the filter cake,and the relationship between the critical maximum pore diameter and the average pore diameter of the for-mation can be co.pared to establish and analyze the formation law of the slurry filter cake;(2)adding particles to the slurry can enhance the effect of the pure bentonite slurry;and(3)adding co.rse-grained materials can effectively improve the film-forming *** slurry is more co.pact when the particle size is close to the average pore size of the formation.

关键词： Slurry shield Filter cake Permeability test Slurry visco.ity Particle size of additives

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co.occurrence of per- and polyfluoroalkyl substances, heavy metals and polycyclic aromatic hydrocarbons and their co.posite impacts on microbial co.sortium in soil: A field study

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Pedosphere 2024年第4期34卷 736-748页

作者： Meng ZHANG Qing WANG Xin SONG Mukhtiar ALI Zhiwen TANG Xin LIU Zhuanxia ZHANG Shurong MA Jinhui BI Zhongyuan LI Key Laboratory of Saline-Alkali Vegetation Eco.ogy Restoration Northeast Forestry UniversityHarbin 150040China Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Center International group co. Ltd.Beijing 101160China China construction Eighth Engineering Division co.p. Ltd.Shanghai 200122China

This is the first study to report the co.occurrence of per-and polyfluoroalkyl substances(PFASs),heavy metals,and polycyclic aromatic hydrocarbons(PAHs)and their impacts on the native microbial co.sortium in soil due to the long-term *** PFASs,heavy metals,and PAHs were detected in soil samples co.lected at 2–6 m below the ground surface at different sampling locations in a steel-making *** total co.centrations of PFASs varied from 6.55 to 19.79 ng g^(-1),with perfluorooctane sulfonate(PFOS),perfluorobutane sulfonate,and 6:2 chlorinated polyfluorinated ether sulfonate(alternative of PFOS)being the predominant *** co.centrations of arsenic,cadmium,and lead were detected in the ranges of 4.40–1270.00,0.01–8.67,and 18.00–647.00 mg kg^(-1),respectively,and the co.centration of total PAHs was detected in the range of 1.02–131.60 mg kg^(-1).The long-term exposure to mixed co.taminants of PFASs,heavy metals,and PAHs led to lower richness and diversity of microbial co.munities in *** soil bacterial co.munities were mainly co.posed of Pseudomonas,norank_p_GAL15,Leptothrix,norank_o_Rokubacteriales,and *** between soil environmental factors and microbial co.munities indicated that cation exchange capacity and total phosphorus were two key factors in shaping the co.position of native microbial ***,Arthrobacter,Leptothrix,and Sphingobium were found to be significantly positively co.related with PFAS co.centrations,indicating that these genera co.ld tolerate the stress exerted by PFASs,along with the stress imposed due to the presence of heavy metals or/and PAHs.

关键词： arsenic cation exchange capacity mixed co.taminant native microbial co.munity perfuorooctane sulfonate total phosphorus

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