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Measurement Methodology for Monitoring Fouling Resistance in Condenser of Chiller

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湖南大学学报（自然科学版） 2009年第S1期36卷 119-122页

作者： YU Dan1,3,GAN Li-si1,CAO Yong2(1.Beijing University of Technology,Beijing 100022,China 2.Build Environment and energy efficiency,China Academy of Building Research,Beijing 100013,China 3.Beijing institute of Civil Engineering and Architecture,Beijing 100044,China) Beijing University of Technology Beijing 100022 China Build Environment and energy efficiency China Academy of Building Research Beijing 100013 China Beijing institute of Civil Engineering and Architecture Beijing 100044 China

This paper established an on-line monitoring model for fouling resistance of cooling water based on heat transfer theory,which was mainly applied to the fouling resistance test for condenser of chiller in operation,and the test requirements were *** proves that the load ratio of chiller has big influence on the test result,and the best load ratio for test is the range of 80%～100%.A case has been executed to validate the model's feasibility.

关键词： fouling resistance monitoring condenser cooling water

Investigation on the spatiotemporal complementarity of wind energy resources in China

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Science China(Technological Sciences) 2012年第3期55卷 725-734页

作者： LIU Yi XIAO LiYe1,2 WANG HaiFeng LIN LiangZhen DAI ShaoTao Key Laboratory of applied superconductivity Chinese Academy of SciencesBeijing 100190China institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China The Queen's University of Belfast Belfast BT95AHUK

Wind power resources are abundant in China,especially in northern China and eastern coastal areas of ***,wind energy has intermittent and unstable characteristics,which leads to random power output and limits the large-scale utilization of wind energy *** has been shown that geographically dispersed wind plants have obvious spatiotemporal offsetting *** output from each individual site exhibits the power ups and ***,when we simulate power lines connecting sites over a certain region,the output from them changes slowly and rarely reaches either very low or full *** using the spatiotemporal complementarity of wind resources effectively is highly beneficial to the smoothing of power *** paper investigates the spatiotemporal complementarity of wind resources in China based on the relevant data of wind energy resources,which are offered by China Meteorological Administration(CMA).

关键词： wind energy complementarity renewable energy

Design of a high-efficiency C-band backward wave oscillator

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Chinese Physics C 2010年第7期34卷 1016-1018页

作者：马乔生张运俭邓德荣谭杰刘忠 institute of applied Electronics

For practicability of the high power microwave source,a C-band backward wave oscillator（BWO） which has high conversion efficiency is *** the axial guiding magnetic field is 0.83 T,the electron energy and the beam current of the diode are respectively 80 keV and 2.1 kA,a microwave output power of 100 MW at 7.4 GHz microwave frequency with 65% conversion efficiency is achieved in simulation.

关键词： high conversion efficiency C-band BWO miniaturization

Multiperspective Analysis of Microscale Trigeneration Systems and Their Role in the Crowd energy Concept

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Journal of Electronic Science and Technology 2015年第3期13卷 206-211页

作者： Parantapa Sawant Naim Meftah Jens Pfafferott the institute of energy System Technologies Offenburg University of Applies Sciences the Department of Mechanical and Process Engineering Offenburg University of Applied Sciences

The energy system of the future will transform from the current centralised fossil based to a decentralised, clean, highly efficient, and intelligent network. This transformation will require innovative technologies and ideas like trigeneration and the crowd energy concept to pave the way ahead. Even though trigeneration systems are extremely energy efficient and can play a vital role in the energy system, turning around their deployment is hindered by various barriers. These barriers are theoretically analysed in a multiperspective approach and the role decentralised trigeneration systems can play in the crowd energy concept is highlighted. It is derived from an initial literature research that a multiperspective （technological, energy-economic, and user） analysis is necessary for realising the potential of trigeneration systems in a decentralised grid. And to experimentally quantify these issues we are setting up a microseale trigeneration lab at our institute and the motivation for this lab is also briefly introduced.

关键词： Adsorption cooling decentralisation,energy efficiency energy system analysis trigeneration.

Modeling core-spreading of interface dislocation and its elastic response in anisotropic bimaterial

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applied Mathematics and Mechanics(English Edition) 2017年第2期38卷 231-242页

作者： Jie LIU Yuheng ZHANG Haijian CHU Shanghai institute of applied Mathematics and Mechanics and Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai University Department of Mechanics College of Sciences Shanghai University

Interfacial dislocation may have a spreading core corresponding to a weak shear resistance of interfaces. In this paper, a conic model is proposed to mimic the spreading core of interfacial dislocation in anisotropic bimaterials. By the Stroh formalism and Green’s function, the analytical expressions of the elastic fields are deduced for such a dislocation. Taking Cu/Nb bimaterial as an example, it is demonstrated that the accuracy and efficiency of the method are well validated by the interface conditions, a spreading core can greatly reduce the stress intensity near the interfacial dislocation compared with the compact core, and the elastic fields near the spreading core region are significantly different from the condensed core, while they are less sensitive to a field point that is 1.5times the core width away from the center of the spreading core.

关键词： interface dislocation core spreading elastic field anisotropic bimaterial

Sorting of bending magnets for the SSRF booster

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Chinese Physics C 2008年第4期32卷 285-289页

作者：后接刘桂民李浩虎张满洲 Shanghai institute of applied Physics CAS

The Shanghai Synchrotron Radiation Facility （SSRF）booster ring, a full energy injector for the storage ring, is deigned to accelerate the electron beam energy from 150 MeV to 3.5 GeV that demands high extraction efficiency at the extraction energy with low beam loss rate when electrons are ramping. Closed orbit distortion （COD） caused by bending magnet field uniformity errors which affects the machine performance harmfully could be effectively reduced by bending magnet location sorting. Considering the affections of random errors in measurement, both ideal sorting and realistic sorting are studied based on measured bending magnet field uniformity errors and one reasonable combination of bending magnets which can reduce the horizontal COD by a factor of 5 is given as the final installation sequence of the booster bending magnets in this paper.

关键词： SSRF bending magnet sorting uniformity resolution

Typical load profile-supported convolutional neural network for short-term load forecasting in the industrial sector

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energy and AI 2021年第3期5卷 242-254页

作者： Thilo Walser Alexander Sauer Fraunhofer institute for Manufacturing Engineering and Automation IPA Nobelstraße 1270569 StuttgartGermany institute for energy efficiency in Production EEP University of StuttgartNobelstraße 1270569 StuttgartGermany

This paper investigates how existing forecasting models can be enhanced to accurately forecast the electric load at factory level,enabling industrial companies to shift consumption to times of low energy *** model architecture must outperform state-of-the-art models and be sufficiently robust for use in multiple factories with low effort for specific ***,this work focuses on the processing of high-resolution input data available almost in real time from multiple submeters after the main *** theory of load forecasting and related works are summarized in a first step including the requirements of forecasting models applied at factory *** on existing models,a new hybrid machine-learning model is proposed,combining a decision tree-based typical load profiler with a convolutional neural network that extracts features from multidimensional endogenous inputs with measurements of the preceding two weeks for multi-step-ahead load forecasts updated almost in real ***,a multi-model approach is presented for calculating bottom-up forecasts with submeter data aggregated to a main-meter *** a case study,the forecasting accuracy of the hybrid model is compared to both base models and a seasonal naïve model calculating the load forecasts for three *** results indicate that the proposed typical-load-profile-supported convolutional neural network for all three factories achieves the lowest forecasting ***,it is validated that a reduction in data transfer delay leads to better forecasts,as the forecasting accuracy is higher with near real time data than with a data transfer delay of one ***,a model architecture is proposed for robust forecasting in digitalized factories.

关键词： Electricity Machine learning Load forecasting Hybrid model Industrial energy systems energy flexibility Submetering Real time data

Enhancing in-field performance of GdBCO coated conductors by cooperative irradiation with Ti ions and protons

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superconductivity 2024年第3期11卷 45-50页

作者： Daxing Huang Hao Dong Tongxin Wang Hao Yu Kaigui Zhu Hongwei Gu Fazhu Ding Key Laboratory of applied superconductivity and institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Department of Physics Beihang UniversityBeijing 100191China

Irradiation can accurately manipulate defects and adjust pinning landscapes within REBa_(2)Cu_(3)O_(7-δ) (REBCO, RE: rare earths) coated conductors (CCs). This study reports a productive method to dramatically boost the in-field critical current density (J_(c) ) for GdBCO CCs using cooperative irradiation with Ti ions and protons. Remarkably, the in-field J_(c) of commercial CCs can be almost doubled at a wide range of temperatures and magnetic fields. Defects of various sizes induced by cooperative irradiation are more uniform distribution through the entire GdBCO film to improve the vortex pinning characteristics, thereby enhancing the in-field performance of the GdBCO CC. This method highlights how combining different particle irradiation types can tailor defect size and distribution, optimizing pinning landscapes for commercial REBCO CCs.

关键词： REBCO Ti-ion irradiation Vortex pinning In-field performance

The interpolating element-free Galerkin method for elastic large deformation problems

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Science China(Technological Sciences) 2021年第2期64卷 364-374页

作者： WU Qiang PENG PiaoPiao CHENG YuMin Shanghai Key Laboratory of Mechanics in energy Engineering Shanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China

This paper presents an interpolating element-free Galerkin(IEFG) method for solving the two-dimensional(2D) elastic large deformation problems. By using the improved interpolating moving least-squares method to form shape function, and using the Galerkin weak form of 2D elastic large deformation problems to obtain the discrete equations, we obtain the formulae of the IEFG method for 2D elastic large deformation problems. As the displacement boundary conditions can be applied directly, the IEFG method can acquire higher computational efficiency and accuracy than the traditional element-free Galerkin(EFG)method, which is based on the moving least-squares approximation and can not apply the displacement boundary conditions directly. To analyze the influences of node distribution, scale parameter of influence domain and the loading step on the numerical solutions of the IEFG method, three numerical examples are proposed. The IEFG method has almost the same high accuracy as the EFG method, and for some 2D elastic large deformation problems the IEFG method even has higher computational accuracy.

关键词： meshless method improved interpolating moving least-squares method interpolating element-free Galerkin method elastic large deformation