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Particle Size Optimization of Thermochemical Salt Hydrates for High Energy Density Thermal Storage
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作者 Andrew Martin Drew Lilley +1 位作者 Raνi Prasher Sumanjeet Kaur 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2024年第2期326-333,共8页
Thermal energy storage(TES)solutions offer opportunities to reduce energy consumption,greenhouse gas emissions,and cost.Specifically,they can help reduce the peak load and address the intermittency of renewable energy... Thermal energy storage(TES)solutions offer opportunities to reduce energy consumption,greenhouse gas emissions,and cost.Specifically,they can help reduce the peak load and address the intermittency of renewable energy sources by time shifting the load,which are critical toward zero energy buildings.Thermochemical materials(TCMs)as a class of TES undergo a solid-gas reversible chemical reaction with water vapor to store and release energy with high storage capacities(600 kWh m^(-3))and negligible self-discharge that makes them uniquely suited as compact,stand-alone units for daily or seasonal storage.However,TCMs suffer from instabilities at the material(salt particles)and reactor level(packed beds of salt),resulting in poor multi-cycle efficiency and high-levelized cost of storage.In this study,a model is developed to predict the pulverization limit or Rcrit of various salt hydrates during thermal cycling.This is critical as it provides design rules to make mechanically stable TCM composites as well as enables the use of more energy-efficient manufacturing process(solid-state mixing)to make the composites.The model is experimentally validated on multiple TCM salt hydrates with different water content,and effect of Rcrit on hydration and dehydration kinetics is also investigated. 展开更多
关键词 high energy density hydration kinetics long-term cycling thermal energy storage thermochemical materials
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Terrestrial water storage variation in Hebei plain area of China,based on ground surface gravimetry 被引量:1
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作者 Hongtao Hao Hongliang Liu +3 位作者 Xinlin Zhang Jin Wei Bin Zhao Minzhang Hu 《Geodesy and Geodynamics》 CSCD 2021年第3期190-196,共7页
Variation of terrestrial water storage in the Hebei plain area from March 2010 to June 2014 was studied using ground gravimetry combined with vertical displacement data from the Global Navigation Satellite System.Resu... Variation of terrestrial water storage in the Hebei plain area from March 2010 to June 2014 was studied using ground gravimetry combined with vertical displacement data from the Global Navigation Satellite System.Results show that observed gravity variation in this area increased continuously,basically reflecting a trend toward land subsidence.With the effect of this subsidence removed,a dominantnegative change in gravity variation was evident,reflecting an average rate of decrease in terrestrial water in this area of 0.10±0.053 m/y,and this is equivalent to a volume of 81.5±43.2×108 m^(3)and is consistent with the spatial distribution of groundwater change from measured hydrologic data.These results can be an essential reference and supplement for the study of terrestrial water variation in the Hebei plain area,and indicate that ground surface gravimetry can be used as an important mean for studying changes in terrestrial water. 展开更多
关键词 Hebei plain area Gravity variation Terrestrial water storage variation ground surface gravimetry Land subsidence
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Spatiotemporal phase change materials for thermal energy long-term storage and controllable release
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作者 Yangeng Li Yan Kou +4 位作者 Keyan Sun Jie Chen Chengxin Deng Chaohe Fang Quan Shi 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第5期228-236,I0006,共10页
Phase change materials(PCMs)have attracted much attention in the field of solar thermal utilization recently,due to their outstanding thermal energy storage performance.However,PCMs usually release their stored latent... Phase change materials(PCMs)have attracted much attention in the field of solar thermal utilization recently,due to their outstanding thermal energy storage performance.However,PCMs usually release their stored latent heat spontaneously as the temperature below the phase transition temperature,rendering thermal energy storage and release uncontrollable,thus hindering their practical application in time and space.Herein,we developed erythritol/sodium carboxymethylcellulose/tetrasodium ethylenediaminetetraacetate(ERY/CMC/EDTA-4Na)composite PCMs with novel spatiotemporal thermal energy storage properties,defined as spatiotemporal PCMs(STPCMs),which exhibit the capacity of thermal energy long-term storage and controllable release.Our results show that the composite PCMs are unable to lose latent heat due to spontaneous crystallization during cooling,but can controllably release thermal energy through cold crystallization during reheating.The cold-crystallization temperature and enthalpy of composite PCMs can be adjusted by proportional addition of EDTA-4Na to the composite.When the mass fractions of CMC and EDTA-4Na are both 10%,the composite PCMs can exhibit the optical coldcrystallization temperature of 51.7℃ and enthalpy of 178.1 J/g.The supercooled composite PCMs without latent heat release can be maintained at room temperature(10-25℃)for up to more than two months,and subsequently the stored latent heat can be controllably released by means of thermal triggering or heterogeneous nucleation.Our findings provide novel insights into the design and construction of new PCMs with spatiotemporal performance of thermal energy long-term storage and controllable release,and consequently open a new door for the development of advanced solar thermal utilization techniques on the basis of STPCMs. 展开更多
关键词 Phase change materials long-term thermal storage Controllable release ERYTHRITOL
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Efficient Technique for Long-Term <i>in Vitro</i>Storage of Transgenic Aspen Genotypes
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作者 Elena O. Vidyagina Konstantin A. Shestibratov 《American Journal of Plant Sciences》 2018年第13期2593-2600,共8页
In vitro culture of isolated cells from tissues and organs is sometimes used to preserve and reproduce unique genotypes of woody plants. The technique, however, requires regular subculturing which raises storage costs... In vitro culture of isolated cells from tissues and organs is sometimes used to preserve and reproduce unique genotypes of woody plants. The technique, however, requires regular subculturing which raises storage costs and creates risks for contamination and accumulation of somaclonal variations. We examined the effects of sugar composition of culture medium, the length of photoperiod, light intensity, and ambient temperature on the survival of plant material in vitro. The study was performed on 49 genotypes of Populus tremula (46 transgenic genotypes carrying GFP-, Xeg- and Gus-genes, and 3 control (wild-type) genotypes). It was shown that effective storage of plants was achieved through optimization of the combined effects of all storage parameters under study. Based on the experimental data, we developed a protocol for long-term in vitro storage of desirable genotypes without subculture and with a survival rate of up to 98%. The best results were obtained when the plant material was pre-cultured on a WPM medium containing 15 g/L sucrose, 7.5 g/L sorbitol and 7.5 g/L mannitol, and then stored at +4°C under a 24-hour light day cycle with only 8 hours of light per day and maximum light intensity of 2000 lux. Post-storage recovery was done by culturing on a medium containing 1 mg/L gibberellic acid. The developed method can be used for effective in vitro storage of the studied genotypes for up to 24 months without subculture. 展开更多
关键词 Populus tremula long-term storage In Vitro Culture Osmolytics TRANSGENIC GENOTYPES Microshoots
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Research and Application of Ecological Outdoor Ground Structure with Composite Water Storage and Drainage Function
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作者 Peng ZHONG Yuqi FAN Zhenggen FAN 《Asian Agricultural Research》 2023年第10期6-9,共4页
In order to solve the problems of surface runoff increase,water accumulation in rainy days and urban heat island effect,an ecological outdoor ground structure with composite water storage and drainage functions was st... In order to solve the problems of surface runoff increase,water accumulation in rainy days and urban heat island effect,an ecological outdoor ground structure with composite water storage and drainage functions was studied and applied in this paper:Through the comprehensive design of road ground,road inspection well,garden inspection well and drainage pipe network,it can quickly store and drain ground water,alleviate the urban heat island effect,realize plant infiltration irrigation,and achieve the purpose of saving water and energy. 展开更多
关键词 Composite water storage and drainage Waterlogging prevention Ecological type Outdoor ground
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Cost Optimization Strategy for Long-Term Storage of Scientific Workflow
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作者 Zaibing Lv Cheng Zhang Futian Wang 《国际计算机前沿大会会议论文集》 2019年第1期156-157,共2页
With the rapid development of cloud environment, the capabilities of systems have been promoted with powerful computing and storage. But for the characteristic of “pay-as-you-go” of cloud resources, it is necessary ... With the rapid development of cloud environment, the capabilities of systems have been promoted with powerful computing and storage. But for the characteristic of “pay-as-you-go” of cloud resources, it is necessary to consider the different data storage cost. Especially for processing of “old data” in longterm storage, an appropriate strategy is needed to reduce users’ cost. Considering the characteristics of price stratification in the current commercial cloud environment, a three-level price stratified storage strategy is proposed based on the CTT-SP algorithm, which stores part of the “old data” on relatively inexpensive secondary and tertiary storage, and ensures that the time delay caused by three-level storage does not exceed the deadline. Compared with other storage methods, the experimental result shows the strategy proposed can guarantee the time delay while reducing the cost of users significantly in longterm storage. 展开更多
关键词 CTT-SP algorithm PRICE STRATIFICATION long-term storage
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UTES (Underground Thermal Energy Storage)---Applications and Market Development in Sweden
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作者 Olof Andersson Jonas Ekkestubbe Anna Ekdahl 《Journal of Energy and Power Engineering》 2013年第4期669-678,共10页
The market for shallow geothermal solutions has been continuously growing in Sweden and is recognized as a cost effective and environmental sound way for space heating. In later years, UTES (underground thermal energ... The market for shallow geothermal solutions has been continuously growing in Sweden and is recognized as a cost effective and environmental sound way for space heating. In later years, UTES (underground thermal energy storage) systems have become fTequently installed for combined heating and cooling of commercial and institutional buildings. After 20 years, operational experiences of these systems are proved to be energy efficient, technically safe and profitable. In this paper, the current statistics of UTES applications are given as well as market trends and technical development. The goal is to encourage designers and installers in other counties to use this promising technology. 展开更多
关键词 Shallow geothermal energy storage ground source heat pumps underground thermal energy storage.
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Effects of Shading Degree on Storage Rate and Growth of Phoebe bournei Seedlings in Fields 被引量:4
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作者 吴际友 黄明军 +6 位作者 陈明皋 董春英 舒瑶 吴其军 程勇 刘球 王旭军 《Agricultural Science & Technology》 CAS 2014年第9期1567-1570,共4页
In the research, four shading treatments were set, including the treatments with shading degrees at 0, 40%, 60% and 70%, in order to explore storage rate and seedling growth of annual Phoebe bournei. The results showe... In the research, four shading treatments were set, including the treatments with shading degrees at 0, 40%, 60% and 70%, in order to explore storage rate and seedling growth of annual Phoebe bournei. The results showed that the storage rate is growing upon shading degree. In the research, for example, storage rate reached the peak with the shading degree at 70%, and only 42.2% with shading degree at 0. In addition, seedling height and ground diameter showed extremely significant differences among treatments, and the treatment with shading degree at 60% was the best. 展开更多
关键词 Phoebe bournei Shading degree Seedling storage rate Seedling height ground diameter Sowing and seedling cultivation in fields
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Carbon dioxide reforming of methane over bimetallic catalysts of Pt-Ru/γ-Al_2O_3 for thermochemical energy storage 被引量:2
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作者 杜娟 杨晓西 +4 位作者 丁静 魏小兰 杨建平 王维龙 杨敏林 《Journal of Central South University》 SCIE EI CAS 2013年第5期1307-1313,共7页
The reaction of CO2 reforming of CH4 has been investigated with y-A1203-supported platinum and ruthenium bimetallic catalysts, with the specific purpose of thermochemical energy storage. The catalysts were prepared by... The reaction of CO2 reforming of CH4 has been investigated with y-A1203-supported platinum and ruthenium bimetallic catalysts, with the specific purpose of thermochemical energy storage. The catalysts were prepared by using the wetness impregnation method. The prepared catalysts were characterized by a series of physico-chemical characterization techniques such as BET surface area, thermo-gravimetric (TG), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). In addition, the amount of carbon deposits on the surface of the catalysts and the type of the carbonaceous species were discussed by TG. It was found that the bimetallic Pt-Ru/7-A1203 catalysts exhibit both superior catalytic activity and remarkable stability by comparison of monometallic catalysts. During the 500 h stability test, the bimetallic catalyst showed a good performance at 800 ~C in CO2 reforming of CH4, exhibiting an excellent anti-carbon performance with the mass loss of less than 8.5%. The results also indicate that CO2 and CH4 have quite stable conversions of 96.0 % and 94.0 %, respectively. Also, the selectivity of the catalysts is excellent with the products ratio of CO/H2 maintaining at 1.02. Furthermore, it was found in TEM images that the active carbonaceous species were formed during the catalytic reaction, and well-distributed dot-shaped metallic particles with a relatively uniform size of about 3 nm as well as amorphous carbon structures were observed. Combined with BET, TG, TEM tests, it is concluded that the selected bimetallic catalysts can work continuously in a stable state at the high temperature, which has a potential to be utilized for the closed-loop cycle of the solar thermochemical energy storage in future industry applications. 展开更多
关键词 carbon dioxide reforming of methane Pt-Ru/7-A1203 catalysts long-term stability thermochemical energy storage
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Assessment of Fatigue Strength of An Offshore Floating Production and Storage Unit 被引量:1
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作者 LIU Jiancheng(刘建成) +1 位作者 GU Yongning(顾永宁) 《China Ocean Engineering》 SCIE EI 2002年第1期41-49,共9页
The procedure of assessment of structural fatigue strength of an offshore floating production and storage and offloading unit (FPSO) in this paper. The emphasis is placed on the long-term prediction of wave induced lo... The procedure of assessment of structural fatigue strength of an offshore floating production and storage and offloading unit (FPSO) in this paper. The emphasis is placed on the long-term prediction of wave induced loading, the refined finite element model for hot spot stress calculation, the combination of stress components, and fatigue damage assessment based on S-N curve. 展开更多
关键词 offshore structure fatigue strength hot spot stress long-term prediction floating production and storage and offloading unit
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Theophyllineecitric acid co-crystals easily induced by DSCeFTIR microspectroscopy or different storage conditions
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作者 Hong-Liang Lin Po-Chun Hsu Shan-Yang Lin 《Asian Journal of Pharmaceutical Sciences》 SCIE CAS 2013年第1期19-27,共9页
A simultaneous differential scanning calorimetryeFourier transform infrared(DSCeFTIR)microspectroscopy was used to quickly investigate the co-crystal formulation between anhydrous theophylline(TP)and anhydrous citric ... A simultaneous differential scanning calorimetryeFourier transform infrared(DSCeFTIR)microspectroscopy was used to quickly investigate the co-crystal formulation between anhydrous theophylline(TP)and anhydrous citric acid(CA)in a one-step procedure.The raw materials of TP andCA,aswell as the intactTPeCA co-crystal prepared by slow solvent evaporation were also respectively examined by this approach.The result indicates that the TPeCA cocrystal formulation was easily induced using this DSCeFTIR technique.The thermaldependent changes in three-dimensional FTIR spectral contour profiles were started from 165C to induce the co-crystal formation of TPeCA,which was prior to the endothermic peak at 173C found in the conventional DSC curve.Beyond 165C,several new IR absorption peaks at 3515,3124,1730,1710,1677,1648,1552 and 1265 cm1 corresponding to unique IR spectral peaks of intact TPeCA co-crystal were observed.The DSCeFTIR microspectroscopic results also evidenced the dimeremonomer transition of CA,but there were no markedly changes for TP or intact TPeCA co-crystal before its fusion.This strongly implies that the DSCeFTIR technique giving spectroscopic and thermodynamic information could simultaneously induce and identify the TPeCA co-crystal formation and phase transition of samples.Different storage conditions affecting the stability of both physical mixture and ground mixture of TPeCA were also determined.The physicalmixture of TPeCA after storing at 55C/75%RH condition for one day was fast transformed to TPeCA co-crystal,indicating that TPeCA co-crystal was easily induced under accelerated storage condition.While the co-crystal formed from TPeCA ground mixture was stable in both 25C/75%RH and 55C/75%RH conditions. 展开更多
关键词 CO-CRYSTAL Anhydrous theophylline Anhydrous citric acid DSCeFTIR storage condition ground mixture
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Multi-Time-Scale Resource Allocation Based on Long-Term Contracts and Real-Time Rental Business Models for Shared Energy Storage Systems
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作者 Yuxuan Zhuang Zhiyi Li +2 位作者 Qipeng Tan Yongqi Li Minhui Wan 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2024年第2期454-465,共12页
The push for renewable energy emphasizes the need for energy storage systems(ESSs)to mitigate the unpre-dictability and variability of these sources,yet challenges such as high investment costs,sporadic utilization,an... The push for renewable energy emphasizes the need for energy storage systems(ESSs)to mitigate the unpre-dictability and variability of these sources,yet challenges such as high investment costs,sporadic utilization,and demand mismatch hinder their broader adoption.In response,shared energy storage systems(SESSs)offer a more cohesive and efficient use of ESS,providing more accessible and cost-effective energy storage solutions to overcome these obstacles.To enhance the profitability of SESSs,this paper designs a multi-time-scale resource allocation strategy based on long-term contracts and real-time rental business models.We initially construct a life cycle cost model for SESS and introduce a method to estimate the degradation costs of multiple battery groups by cycling numbers and depth of discharge within the SESS.Subsequently,we design various long-term contracts from both capacity and energy perspectives,establishing associated models and real-time rental models.Lastly,multi-time-scale resource allocation based on the decomposition of user demand is proposed.Numerical analysis validates that the business model based on long-term contracts excels over models operating solely in the real-time market in economic viability and user satisfaction,effectively reducing battery degradation,and leveraging the aggregation effect for SESS can generate an additional increase of 10.7%in net revenue. 展开更多
关键词 Capacity allocation long-term contracts shared energy storage system stochastic programming
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Simulation of embedded heat exchangers of solar aided ground source heat pump system 被引量:1
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作者 王芳 郑茂余 +1 位作者 邵俊鹏 李忠建 《Journal of Central South University》 SCIE EI CAS 2008年第S2期261-266,共6页
Aimed at unbalance of soil temperature field of ground source heat pump system, solar aided energy storage system was established. In solar assisted ground-source heat pump (SAGSHP) system with soil storage, solar ene... Aimed at unbalance of soil temperature field of ground source heat pump system, solar aided energy storage system was established. In solar assisted ground-source heat pump (SAGSHP) system with soil storage, solar energy collected in three seasons was stored in the soil by vertical U type soil exchangers. The heat abstracted by the ground-source heat pump and collected by the solar collector was employed to heating. Some of the soil heat exchangers were used to store solar energy in the soil so as to be used in next winter after this heating period; and the others were used to extract cooling energy directly in the soil by circulation pump for air conditioning in summer. After that solar energy began to be stored in the soil and ended before heating period. Three dimensional dynamic numerical simulations were built for soil and soil heat exchanger through finite element method. Simulation was done in different strata month by month. Variation and restoration of soil temperature were studied. Economy and reliability of long term SAGSHP system were revealed. It can be seen that soil temperature is about 3 ℃ higher than the original one after one year's running. It is beneficial for the system to operate for long period. 展开更多
关键词 SOLAR assisted ground source heat PUMP (ASGSHP) soil storage three DIMENSIONAL simulations HEATING and COOLING
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GPS monitoring and analysis of ground movement and deformation induced by transition from open-pit to underground mining 被引量:3
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作者 Fengshan Ma Haijun Zhao +4 位作者 Yamin Zhang Jie Guo Aihua Wei Zhiquan Wu Yonglong Zhang 《Journal of Rock Mechanics and Geotechnical Engineering》 2012年第1期82-87,共6页
To trace the potential hazards of open-pit slope in Longshou mine,global positioning system(GPS) is applied to monitoring ground movement and deformation induced by transition from open-pit to underground mining.Thr... To trace the potential hazards of open-pit slope in Longshou mine,global positioning system(GPS) is applied to monitoring ground movement and deformation induced by transition from open-pit to underground mining.Through long-term monitoring from 2003 to 2008,huge amounts of data were acquired.Monitoring results show that large-scale ground movement and deformation have occurred in mining area,and the movement area is ellipse-shaped.The displacement boundary of settlement trough is 2.0 km long along the exploratory line,and 1.5 km long along the strike of ore body.GPS monitoring results basically agree with the practical deformation state of open-pit slope.It is indicated that the long-term GPS monitoring is an effective way to understand the mechanism of ground movement and deformation in mine area. 更多 展开更多
关键词 open-pit ground movement long-term GPS monitoring deformation analysis
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Possibilities of Reducing Energy Consumption by Optimization of Ground Source Heat Pump Systems in Babylon, Iraq
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作者 Jenny Lindblom Nadhir Al-Ansari Qais Al-Madhlom 《Engineering(科研)》 2016年第3期130-139,共10页
Iraq is located in the Middle East with an area that reaches 437,072 km2 and a population of about 36 million. This country is suffering from severe electricity shortage problems which are expected to increase with ti... Iraq is located in the Middle East with an area that reaches 437,072 km2 and a population of about 36 million. This country is suffering from severe electricity shortage problems which are expected to increase with time. In this research, an attempt is made to minimize this problem by combining the borehole thermal energy storage (BTES) with a heat pump, the indoor temperature of a residential building or other facility may be increased or reduced beyond the temperature interval of the heat carrier fluid. Due to the relatively high ground temperature in Middle Eastern countries, the seasonal thermal energy storages (STES) and ground source heat pump (GSHP) systems have a remarkable potential, partly because the reduced thermal losses from the underground storage and the expected high COP (ratio of thermal energy gain to required driving energy (electricity)) of a heat pump, partly because of the potential for using STES directly for heating and cooling. In this research, groundwater conditions of Babylon city in Iraq were investigated to evaluate the possibility of using GSHP to reduce energy consumption. It is believed that such system will reduce consumed energy by about 60%. 展开更多
关键词 ground Source Heat Pump Seasonal Thermal Energy storages Energy Saving BABYLON Iraq
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深部地下空间储能安全与应急保障技术现状与发展趋势
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作者 张来斌 胡瑾秋 +1 位作者 肖尚蕊 吴明远 《石油科学通报》 CAS 2024年第3期434-448,共15页
伴随“三深引领”的科技攻关目标,我国油气资源勘探正由浅表地层向深部地层进发,千米级深部地下工程建设已成常态。随着深地工程的探索,枯竭油气藏、盐穴、采空区等可利用的深部地下空间涌现,深部地下空间在大规模能源储存利用上已被证... 伴随“三深引领”的科技攻关目标,我国油气资源勘探正由浅表地层向深部地层进发,千米级深部地下工程建设已成常态。随着深地工程的探索,枯竭油气藏、盐穴、采空区等可利用的深部地下空间涌现,深部地下空间在大规模能源储存利用上已被证明具有储量大、分布广、安全性高、经济成本低和环境友好等优势,深部地下空间工业化储能应用是优化我国能源储存结构、保障国家能源储存战略需求的有力手段。然而,我国对深部地下空间储能安全与应急保障技术研究起步较晚,目前常用的地面油气储存手段受限于地理环境、工程建设以及运输方式等条件,同时地面油气储备库事故存在致因因素复杂、关联性强、受灾波及范围广等安全难题,深部地下空间能源安全储存迫在眉睫。当下我国对深部地下空间储能的利用聚焦于枯竭油气藏的再开发,现有的深地安全保障技术落后于深地储能基础设施安全保障的现实需求。因此,本文系统性总结了深地储气、储氢、碳封存以及压缩空气蓄能等深地储能技术研究现状,以能源行业绿色转型兼备战略能源安全储存为目标,强调能源储存、碳封存以及资源深度开采的三位一体,提出了深地空间储能利用双碳循环架构。同时系统性辨识了深地储能设备设施面临的风险,涵盖深地储能设计期、施工期、运行期和废弃期的全生命周期,揭示我国深地储能安全与应急保障技术发展需求、发展难点,构建了深地储能全生命周期安全与应急保障技术框架,提出我国2024—2050年期间深部地下空间储能安全与应急保障技术发展建议,为完善我国深部地下空间储能安全与应急保障技术体系提供参考。 展开更多
关键词 深部地下空间 能源存储 深地储能 安全与应急保障技术 风险辨识
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装配式柔性墙体日光温室联合储热系统蓄放热特性
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作者 马蔷薇 李明 +3 位作者 王利春 胡娟秀 宋卫堂 魏晓明 《农业工程学报》 EI CAS CSCD 北大核心 2024年第15期183-193,共11页
增设多蓄热介质联合主动蓄放热系统是解决装配式柔性墙体日光温室“重保温、轻蓄热”问题的有效方法,但当前对于“土壤-空气-水”多介质联合储热系统蓄放热特性和加温效果尚不明确,针对此问题,该研究以配备“空气源地中热交换-水源后墙... 增设多蓄热介质联合主动蓄放热系统是解决装配式柔性墙体日光温室“重保温、轻蓄热”问题的有效方法,但当前对于“土壤-空气-水”多介质联合储热系统蓄放热特性和加温效果尚不明确,针对此问题,该研究以配备“空气源地中热交换-水源后墙循环换热”联合储热系统的装配式柔性墙体日光温室为研究对象,采用现场跟踪测试和能量转移测算,对联合储热系统各自和组合的蓄放热特性进行研究。结果表明,配有联合储热系统的装配式柔性墙体日光温室室内夜间最低空气温度维持在10℃以上,室内外最大温差达26.5℃。0~50 cm的土壤层是该温室主要蓄热介质,晴天土壤层蓄热量最高占总蓄热量的63.5%。地中热交换系统最高占土壤蓄热量的54.4%。水循环系统蓄热量可达424.04 MJ,最高占总蓄热量的45.1%,通过循环蓄热可将储水池内8 m3水的温度提高到35℃。连阴天时,通过引入蓄放热比指标,对联合储热系统的运行效果进行定量评价,发现水循环系统具有蓄放热速度快的特点,蓄放热比绝对值最高可达1.62,是当天土壤蓄放热的1.8倍。但从总量上看,土壤仍是连阴天主要放热来源,在北京地区联合蓄放热系统能够维持3个连阴天的热量需求。水循环系统平均性能系数(coefficient of performance,COP)为9.16,地中热交换系统平均COP为6.82,联合蓄放热系统综合COP为8.85,对比热泵,其节能率达60.26%。研究结果为联合储热系统蓄放热机理研究提供了理论依据。 展开更多
关键词 日光温室 墙体 传热 联合储热 蓄放热特性 水循环 地中换热
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Long-term Coordination of Transmission and Storage to Integrate Wind Power 被引量:17
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作者 Antonio J.Conejo Yaohua Cheng +1 位作者 Ning Zhang Chongqing Kang 《CSEE Journal of Power and Energy Systems》 SCIE 2017年第1期36-43,共8页
A power system with a high wind power integration requires extra transmission capacity to accommodate the intermittency inherent to wind power production.Storage can smooth out this intermittency and reduce transmissi... A power system with a high wind power integration requires extra transmission capacity to accommodate the intermittency inherent to wind power production.Storage can smooth out this intermittency and reduce transmission requirements.This paper proposes a stochastic optimization model to coordinate the long-term planning of both transmission and storage facilities to efficiently integrate wind power.Both longterm and short-term uncertainties are considered in this model.Long-term uncertainty is described via scenarios,while shortterm uncertainty is described via operating conditions.Garver’s 6-node system and a system representing Northwest China in 2030 are used to illustrate the proposed model.Results indicate that storage reduces transmission requirement and the overall investment,and allows the efficient integration of wind power. 展开更多
关键词 long-term planning storage TRANSMISSION uncertainty wind power
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粮食平房仓太阳能光伏-地源热泵供冷系统仿真研究与试验
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作者 闫喜龙 陈雁 +3 位作者 戴诗渝 杜潇 赵志文 崔伟华 《农业工程学报》 EI CAS CSCD 北大核心 2024年第18期42-50,共9页
为解决粮食平房仓通风能耗大、储粮成本高的问题,该研究提出太阳能-地源热泵供冷系统,研究太阳能光伏-地源热泵供冷系统在粮食平房仓建筑中的可行性以及节能效果,以实现“零能耗”和“零排放”绿色储粮。基于粮食平房仓实际尺寸,建立了... 为解决粮食平房仓通风能耗大、储粮成本高的问题,该研究提出太阳能-地源热泵供冷系统,研究太阳能光伏-地源热泵供冷系统在粮食平房仓建筑中的可行性以及节能效果,以实现“零能耗”和“零排放”绿色储粮。基于粮食平房仓实际尺寸,建立了空气源热泵与太阳能光伏-地源热泵供冷系统仿真模型,并通过与仓房实测数据的对比进行了模型验证,从运行性能、光电适配性、经济性、节能以及环保效益等方面对供冷系统进行了分析。结果表明:系统运行1 a后性能系数(coefficient of performance,COP)最大值为4.76,最小值3.3;运行10 a后COP最大值为3.96,最小值3.07;系统年实际发电量与库区用电量之比为192%~270%;投资回收期为7.8 a;与传统空气源热泵系统相比,太阳能-地源热泵供冷系统节能率达59%,研究结果可为粮食平房仓供冷系统优化提供理论依据和设计参考。 展开更多
关键词 光伏 太阳能 粮食平房仓 太阳能-地源热泵供冷系统 低温储粮
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温室太阳能跨季节蓄热-土壤源热泵耦合供暖运行特性
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作者 杨绪飞 李飞 +4 位作者 孙东亮 于长永 冉宇进 张伟 宇波 《农业工程学报》 EI CAS CSCD 北大核心 2024年第19期186-196,共11页
针对温室采用土壤源热泵供暖存在土壤热失衡明显、土壤温度和供暖能效逐年降低的问题,该研究在112 m^(2)玻璃温室建设了耦合太阳能跨季节蓄热的土壤源热泵供暖系统,通过两个供暖周期试验,对热泵机组的运行、土壤热失衡、太阳能跨季节蓄... 针对温室采用土壤源热泵供暖存在土壤热失衡明显、土壤温度和供暖能效逐年降低的问题,该研究在112 m^(2)玻璃温室建设了耦合太阳能跨季节蓄热的土壤源热泵供暖系统,通过两个供暖周期试验,对热泵机组的运行、土壤热失衡、太阳能跨季节蓄热以及太阳能直供-土壤源热泵耦合供暖的运行特性进行深入分析。结果表明,在土壤源热泵供暖结束后,工作井温度下降2.40~2.97℃、监测井土壤温度下降0.60~1.00℃,土壤热失衡问题突出;太阳能跨季节蓄热使得监测井土壤温度较初始地温上升约0.2℃,有效解决了土壤热失衡问题;耦合供暖时太阳能直供可承担11%的热负荷,使得温室供暖能效系数从上一年度的2.79提升至3.19,提高了14.3%,节能效果明显。该研究揭示了供暖系统全年度和典型工况下的运行特性,实证了耦合太阳能解决土壤源热泵热失衡问题的可行性和高效性,并给出了系统高效运行主要操作参数的推荐值,为温室供暖相关研究与工程应用提供案例参考和数据支撑。 展开更多
关键词 温室 清洁供暖 太阳能跨季节蓄热 土壤源热泵 热失衡 运行特性
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