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Optimisation for interconnected energy hub system with combined ground source heat pump and borehole

Da HUO, Wei WEI, Simon Le BLOND

《能源前沿（英文）》 2018年第12卷第4期页码 529-539 doi: 10.1007/s11708-018-0580-0

摘要： Ground source heat pumps (GSHP) give zero-carbon emission heating at a residential level. However, as the heat is discharged, the temperature of the ground drops, leading to a poorer efficiency. Borehole inter-seasonal thermal storage coupled with GSHP maintains the efficiency at a high level. To adequately utilize the high performance of combined GSHP and the borehole system to further increase system efficiency and reduce cost, such a combined heating system is incorporated into the interconnected multi-carrier system to support the heat load of a community. The borehole finite element (FE) model and an equivalent borehole transfer function are proposed and respectively applied to the optimisation to analyze the variation of GSHP performance over the entire optimisation time horizon of 24 h. The results validate the borehole transfer function, and the optimisation computation time is reduced by 17 times compared with the optimisation using the FE model.

关键词： borehole thermal storage energy hub ground source heat pumps (GSHP) particle swarm optimisation

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A comprehensive energy solution for households employing a micro combined cooling, heating and power

Huayi ZHANG, Can ZHANG, Fushuan WEN, Yan XU

《能源前沿（英文）》 2018年第12卷第4期页码 582-590 doi: 10.1007/s11708-018-0592-9

摘要：

In recent years, micro combined cooling, heating and power generation (mCCHP) systems have attracted much attention in the energy demand side sector. The input energy of a mCCHP system is natural gas, while the outputs include heating, cooling and electricity energy. The mCCHP system is deemed as a possible solution for households with multiple energy demands. Given this background, a mCCHP based comprehensive energy solution for households is proposed in this paper. First, the mathematical model of a home energy hub (HEH) is presented to describe the inputs, outputs, conversion and consumption process of multiple energies in households. Then, electrical loads and thermal demands are classified and modeled in detail, and the coordination and complementation between electricity and natural gas are studied. Afterwards, the concept of thermal comfort is introduced and a robust optimization model for HEH is developed considering electricity price uncertainties. Finally, a household using a mCCHP as the energy conversion device is studied. The simulation results show that the comprehensive energy solution proposed in this work can realize multiple kinds of energy supplies for households with the minimized total energy cost.

关键词： energy hub micro combined cooling heating and power generation (mCCHP) thermal comfort robust optimization

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Optimal dispatch of multi energy system using power-to-gas technology considering flexible load on user

Zi LING, Xiu YANG, Zilin LI

《能源前沿（英文）》 2018年第12卷第4期页码 569-581 doi: 10.1007/s11708-018-0595-6

摘要：

The relation between power-to-gas technology (P2G) and energy interconnection becomes increasingly close. Meanwhile, the participation of flexible load on user side in system optimization has attracted much attention as an efficient approach to relieve the contradiction between energy supply and energy demand. Based on the concept of energy hub, according to its series characteristic, this paper established a generic multi-energy system model using the P2G technology. The characteristic of flexible load on user side was considered and optimal dispatch analysis was made, so as to reduce the cost, to reasonably dispatch the flexible load, to reduce the discharge, to enhance the new energy output, and to increase the power-to-gas conversion efficiency. Finally, a concrete analysis was made on the optimal dispatch result of the multi-energy system using the P2G technology considering flexible load on user side in the calculating example, and optimal dispatch of the system was verified via four different scenarios. The results indicate that cooperative dispatch of multi-energy system using the P2G technology considering flexible load on user side is the most economic, and can make a contribution to absorption of new energy and P2G conversion. In this way, environmental effects and safe and stable operation of the system can be guaranteed.

关键词： multi-energy system energy hub series characteristic optimal dispatch flexible load

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Study on rigid-flexible coupling dynamics of hub-plate system

ZHAO Feiyun, XIE Yongcheng, ZHANG Ming, HE Yinbiao

《能源前沿（英文）》 2007年第1卷第2期页码 181-188 doi: 10.1007/s11708-007-0023-9

摘要： Dynamic modeling of a rotating flexible hub-plate system is investigated by using Jourdain s variation principle in which the finite element method (FEM) is used as discretization method for a flexible plate. Different from the previous modeling of a plate with a prescribed large overall motion, the coupling between large overall motion of the system and elastic deformation of the flexible plate is taken into account in the proposed coupling model. The quadratic terms are included in the strain-displacement expression, such that the dynamic stiffening terms are included. Simulation of a rotating hub-plate system indicates that the linear model based on linear strain-displacement assumption may lead to erroneous results in the case of high rotation speed. Conservation of energy verifies the validity of the proposed model. Furthermore, frequency analysis of a hub-plate system shows the difference between the frequencies of the system with free and prescribed large overall motion, and parameter analysis of the system reveals the coupling characteristics of the rotational motion and the deformation.

关键词： discretization erroneous Furthermore Different Conservation

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三峡‒ 葛洲坝梯级枢纽通航二十年创新发展与实践

齐俊麟,陈冬元,李然

《中国工程科学》 2023年第25卷第1期页码 155-166 doi: 10.15302/J-SSCAE-2023.07.006

摘要：

面对三峡‒ 葛洲坝梯级枢纽通航设计能力逐渐饱和、过坝货运量快速增长的新形势与新常态，积极利用现代信息技术提升通航能力成为当前三峡高质量通航发展的必然选择。本文旨在阐述三峡‒ 葛洲坝梯级枢纽高质量通航的技术体系构建及其工程应用，按照现状分析、技术体系构建、实施成效、存在瓶颈、后续发展措施的总脉络展开研究。在梳理国内外发展现状的基础上，研判了影响三峡高质量通航的主要因素在于通航装备、交通组织、安全保障、环境整治、绿色养护，构建了三峡‒ 葛洲坝梯级枢纽高质量通航的技术体系。立足三峡‒ 葛洲坝梯级枢纽通航20 年发展实践，凝练了智能运营、通航组织、安全保障、航道能力、绿色通航等梯级枢纽通航成果；针对高质量通航发展的主要瓶颈，提出了三峡‒ 葛洲坝梯级枢纽智慧绿色通航的中长期发展建议。三峡‒ 葛洲坝梯级枢纽智能化运行及其效率提升，可为内河大型梯级枢纽通航建设提供技术借鉴与管理启示。

关键词：三峡工程；梯级枢纽；通航组织；智能通航；绿色建养

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煤矿区综合能源微网架构及低碳运行优化研究

穆云飞,吴志军 ,郭浩辰,贾宏杰,王成山

《中国工程科学》 2023年第25卷第5期页码 111-121 doi: 10.15302/J-SSCAE-2023.05.010

摘要： Two-stage robust stochastic scheduling for energy recovery in coal mine integrated energy system [J]Applied Energy , 2021 , 290 : 116759 .">41]。Applied Energy , 2021 , 307 : 118130 .">44]。Applied Energy , 2021 , 307 : 118130 .">44]。Applied Energy , 2021 , 307 : 118130 .">44]。

关键词：煤矿区；综合能源微网；物质流 ‒ 能量流 ‒ 碳流枢纽模型；碳能协同；低碳运行优化

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我国港口城市氢能发展潜力与对策研究

刘岢孟 ,高俊莲 ,孙旭东 ,张博,吴荣

《中国工程科学》 2022年第24卷第3期页码 108-117 doi: 10.15302/J-SSCAE-2022.03.012

摘要：

氢能是我国未来能源转型与产业发展的重要方向；港口城市是我国经济发展与对外开放的关键地带，加快和推动能源绿色低碳转型、布局氢能规模化开发利用是推动我国港口城市高质量发展的重要手段。本文首先明确了我国港口城市氢能产业发展的基础，分析了港口城市氢能产业发展的现状、已有规划目标以及存在的问题，进而提出了港口城市氢能发展的方向和路径选择。研究发现，我国港口城市具有区位优势明显、氢能资源丰富、应用场景突出、研发实力雄厚、人才集聚力强等发展基础，可以通过港口、重型卡车、公交车等应用场景，推进氢能重点工程项目的部署落实，将港口城市打造为氢能技术先进、氢能供应充足、产业链完备的国际能源枢纽。为进一步把握港口城市氢能产业发展的战略机遇，研究建议，各地要积极开放合作，构建良好生态；抓关键补短板，构建创新体系；坚持安全为先，推进场景应用；加快技术创新，激发发展动力。

关键词：港口城市；氢能技术；氢能应用；国际氢能交通枢纽

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对上海国际航运中心发展方向选择的探讨

车军,季岚,汤连帮

《中国工程科学》 2013年第15卷第6期页码 66-73

摘要：

在分析和总结世界主要国际航运中心的发展历程和规律的基础上，结合国际航运发展新趋势，明确指出上海国际航运中心正处在形成期，上海国际航运中心形成期应选择以港口“硬实力”为发展着手，巩固上海港国际集装箱枢纽地位，加速吸引航运资源要素集聚，进而推动航运服务“软实力”共同发展，最终确定上海国际航运中心地位。

关键词：上海国际航运中心集装箱枢纽港港口“硬实力”

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核能发展国际高端论坛 International Summit on Nuclear Energy Development

会议日期： 2019年05月15日

会议地点：中国

主办单位：中国工程院

多式联运联接共性关键技术体系构建研究

张玉召,李海军,张文豪 ,杨建铃

《中国工程科学》 2023年第25卷第6期页码 212-224 doi: 10.15302/J-SSCAE-2023.06.015

摘要：

公路、铁路、水路等货物运输方式的高效衔接是多式联运发展的核心，多式联运联接共性关键技术是实现不同货物运输方式衔接的基础，构建多式联运联接共性关键技术体系有助于推动多式联运高质量发展。本文在分析国内外多式联运发展现状的基础上，剖析了我国多式联运发展的瓶颈问题及技术突破点，提出了多式联运联接共性关键技术体系构建思路，搭建了涵盖基础网络、载运工具、数据信息、运输组织、标准规范、枢纽布局等六大模块的技术体系。结合我国实际，提出了我国多式联运技术的发展建议：做好顶层设计，为多式联运联接技术发展提供引领；加快数字化建设进程，为多式联运联接打牢技术底座；推进标准体系建设，为多式联运联接技术发展破除尺度壁垒；制定联运设施衔接的支持政策，为多式联运联接技术发展提供资金保障；加强协调机制建设，为多式联运联接打通管理屏障。

关键词：多式联运联接；基础网络；数据信息；标准规范；枢纽布局

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Microwave-induced high-energy sites and targeted energy transition promising for efficient energy deployment

《能源前沿（英文）》 2022年第16卷第6期页码 931-942 doi: 10.1007/s11708-021-0771-y

摘要： Diverse interactions between microwaves and irradiated media provide a solid foundation for identifying novel organization pathways for energy flow. In this study, a high-energy-site phenomenon and targeted-energy transition mechanism were identified in a particular microwave heating (MH) process. Intense discharges were observed when microwaves were imposed on irregularly sized SiC particles, producing tremendous heat that was 8-fold the amount generated in the discharge-free case. Energy efficiency was thereby greatly improved in the electricity-microwaves-effective heat transition. Meanwhile, the dispersed microwave field energy concentrated in small sites, where local temperatures could reach 2000°C– 4000°C, with the energy density reaching up to 4.0 × 10⁵ W/kg. This can be called a high-energy site phenomenon which could induce further processes or reactions enhancement by coupling effects of heat, light, and plasma. The whole process, including microwave energy concentration and intense site-energy release, shapes a targeted-energy transition mechanism that can be optimized in a controlled manner through morphology design. In particular, the discharge intensity, frequency, and high-energy sites were strengthened through the fabrication of sharp nano/microstructures, conferring twice the energy efficiency of untreated metal wires. The microwave-induced high-energy sites and targeted energy transition provide an important pathway for high-efficiency energy deployment and may lead to promising applications.

关键词： microwave discharge high-energy sites targeted-energy transition morphology design energy efficiency

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核能发展国际高端论坛 International Summit on Nuclear Energy Development

会议日期： 2019年05月15日

会议地点：中国

主办单位：中国工程院

Analysis of energy saving optimization of campus buildings based on energy simulation

Dingding TONG, Jing ZHAO

《能源前沿（英文）》 2013年第7卷第3期页码 388-398 doi: 10.1007/s11708-013-0273-7

摘要： The energy consumption of campus buildings has specific characteristics, because of the concentrated distribution of people’s working time and locations that change in line with distinct seasonal features. The traditional energy system design and operation for campus buildings is only based on the constant room temperature, such as 25°C in summer and 18°C in winter in China, not taking into consideration the real heating or cooling load characteristics of campus buildings with different functions during the whole day and whole year, which usually results in a lot of energy waste. This paper proposes to set different set-point temperatures in different operation stages of public and residential campus buildings to reduce the heating and cooling design load for energy station and total campus energy consumption for annual operation. Taking a campus under construction in Tianjin, China as an example, two kinds of single building models were established as the typical public building and residential building models on the campus. Besides, the models were simulated at both set-point room temperature and constant room temperature respectively. The comparison of the simulation results showed that the single building energy saving method of the peak load clipping could be used for further analysis of the annual energy consumption of campus building groups. The results proved that the strategy of set-point temperature optimization could efficiently reduce the design load and energy consumption of campus building groups.

关键词： campus buildings set-point temperature energy simulation energy saving optimization

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Modeling China’s energy dilemma: conflicts among energy saving, energy security, and CO 2 mitigation

Feng FU, Zheng LI, Linwei MA,

《能源前沿（英文）》 2010年第4卷第3期页码 295-300 doi: 10.1007/s11708-010-0104-z

摘要： This study analyzes China’s future energy scenarios stretching until 2050 under different policy portfolios of energy security (e.g., oil import dependency) and CO emissions control. Four scenarios, namely, ① business as usual, ② strong oil import dependency (OID) control, ③ strong CO emissions control, and ④ twofold emphasis on OID and CO emissions control, are designed. The results reveal the existence of conflicts among China’s multiple objectives, particularly energy saving, energy security, and CO mitigation. Based on the analysis, an improvement in China’s efficiency in fossil energy conversion and the promotion of the utilization of non-fossil energy such as nuclear, wind, and hydro energy are recommended. The over-development of coal-derived fuels should also be avoided because of incremental coal consumption and CO emissions. Furthermore, research on and development of carbon capture and storage technologies should be promoted, while the energy efficiency loss caused by integrating these technologies into energy systems should be reduced in view of the high possibility of stricter standards for CO emissions in the future.

关键词： Energy dilemma energy saving energy security CO2 mitigation

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Blockchain in energy systems: values, opportunities, and limitations

《能源前沿（英文）》 2022年第16卷第1期页码 9-18 doi: 10.1007/s11708-022-0818-8

摘要： The structure of a power energy system is becoming more distributed than before. It becomes challenging to manage such a system in a centralized way, because a central authority may not exist or may not be trusted by all parties. Blockchain is a promising tool to address this challenge, by enabling trusted collaboration in the absence of a trusted central authority. Its use in the energy sector has been pioneered by several pilot projects. However, to date the energy sector has not seen large-scale deployment of blockchain, partly because the founders of those pilot projects, the public, and utilities have not reached consensus on the values and limitations of blockchain in energy. This perspective aims to bridge this gap. First, the philosophy and unique values of blockchain are discussed. Second, some promising blockchain-based applications in energy systems are presented. Third, some common misunderstandings of blockchain in energy are discussed. Last, some frequently-asked questions from utilities are discussed. Hopefully this perspective can help advance large-scale deployment of blockchain in energy systems.

关键词： blockchain immutability energy trading energy management data synchronization