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The Influence of Ejector’s Structure Parameters on the Performance of Ejector Refrigeration System

Procedia engineering 2017年 205卷 2683-2690页

作者： Wenju Hu Meng-yuan Wang Jin-zhe Nie Yan Gao Qun-li Zhang Beijing Key Lab of HVAC Beijing University of Civil Engineering and Architecture Beijing 100044 China Beijing Advanced Innovation Center for Future Urban Design Beijing University of Civil Engineering and Architecture Beijing 100044 China

Ejector refrigeration system has been used popularly for its simple structure, fewer moving parts and fully use of low grade heat. Ejector is the main part of the ejector refrigeration system, and the structure and size design of ejector strongly affect the performance of refrigeration system. Mathematical model of an ejector refrigeration system was developed and the influence of different ratio of throat area and mixed area on performance of refrigeration system was analyzed. Results show that under the given operating condition there exists an optimal ratio of injector nozzle throat area to the cylinder area of the mixing section making the best performance for the refrigeration system. When the optimal ratio value kept, the cooling capacity, heat requirement, injection coefficient and COP reach the maximum value at the optimal ratio value while the pump power reaches the lowest value.

关键词： Ejector refrigeration system Coefficient of performance

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Tunable Topological Energy Bands in 2D Dialkali-Metal Monoxides

arXiv

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arXiv 2019年

作者： Hua, Chenqiang Li, Si Xu, Zhu-An Zheng, Yi Yang, Shengyuan A. Lu, Yunhao Zhejiang Province Key Laboratory of Quantum Technology and Device Department of Physics in Zhejiang University State Key Lab of Silicon Materials School of Materials Science and Engineering in Zhejiang University Hangzhou310027 China School of Physics and Electronics Hunan Normal University ChangshaHunan410081 China Research Laboratory for Quantum Materials in Singapore University of Technology and Design Singapore487372 Singapore Center for Quantum Transport and Thermal Energy Science School of Physics and Technology Nanjing Normal University Nanjing210023 China Zhejiang Province Key Laboratory of Quantum Technology and Device Department of Physics in Zhejiang University Hangzhou310027 China Collaborative Innovation Centre of Advanced Microstructures in Nanjing University Nanjing210093 China

2D materials with nontrivial energy bands are highly desirable for exploring various topological phases of matter, as low dimensionality opens unprecedented opportunities for manipulating the quantum states. Here, it is reported that monolayer (ML) dialkali-metal monoxides, in the well-known 2H-MoS2 type lattice, host multiple symmetry-protected topological phases with emergent fermions, which can be effectively tuned by strain engineering. Based on first-principles calculations, it is found that in the equilibrium state, ML Na2O is a 2D double Weyl semimetal, while ML K2O is a 2D pseudospin-1 metal. These exotic topological states exhibit a range of fascinating effects, including universal optical absorbance, super Klein tunneling, and super collimation effect. By introducing biaxial or uniaxial strain, a series of quantum phase transitions between 2D double Weyl semimetal, 2D Dirac semimetal, 2D pseudospin-1 metal, and semiconductor phases can be realized. The results suggest monolayer dialkali-metal monoxides as a promising platform to explore fascinating physical phenomena associated with novel 2D emergent fermions. Copyright © 2019, The Authors. All rights reserved.

关键词： Phase transitions

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CEPC Technical design Report

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Radiation Detection Technology and Methods 2024年第1期8卷 I0003-I0016,1-1091页

作者： Waleed Abdallah Tiago Carlos Adorno de Freitas Konstantin Afanaciev Shakeel Ahmad Ijaz Ahmed Xiaocong Ai Abid Aleem Wolfgang Altmannshofer Fabio Alves Weiming An Rui An Daniele Paolo Anderle Stefan Antusch Yasuo Arai Andrej Arbuzov Abdesslam Arhrib Mustafa Ashry Sha Bai Yu Bai Yang Bai Vipul Bairathi Csaba Balazs Philip Bambade Yong Ban Tripamo Bandyopadhyay Shou-Shan Bao Desmond P.Barber Ayse Bat Varvara Batozskaya Subash Chandra Behera Alexander Belyaev Michele Bertucci Xiao-Jun Bi Yuanjie Bi Tianjian Bian Fabrizio Bianchi Thomas Biekotter Michela Biglietti Shalva Bilanishvili Deng Binglin Denis Bodrov Anton Bogomyagkov Serge Bondarenko Stewart Boogert Maarten Boonekamp Marcello Borri Angelo Bosotti Vincent Boudry Mohammed Boukidi Igor Boyko Ivanka Bozovic Giuseppe Bozzi Jean-Claude Brient Anastasiia Budzinskaya Masroor Bukhari Vladimir Bytev Giacomo Cacciapaglia Hua Cai Wenyong Cai Wujun Cai Yijian Cai Yizhou Cai Yuchen Cai Haiying Cai Huacheng Cai Lorenzo Calibbi Junsong Cang Guofu Cao Jianshe Cao Antoine Chance Xuejun Chang Yue Chang Zhe Chang Xinyuan Chang Wei Chao Auttakit Chatrabhuti Yimin Che Yuzhi Che Bin Chen Danping Chen Fuqing Chen Fusan Chen Gang Chen Guoming Chen Hua-Xing Chen Huirun Chen Jinhui Chen Ji-Yuan Chen Kai Chen Mali Chen Mingjun Chen Mingshui Chen Ning Chen Shanhong Chen Shanzhen Chen Shao-Long Chen Shaomin Chen Shiqiang Chen Tianlu Chen Wei Chen Xiang Chen Xiaoyu Chen Xin Chen Xun Chen Xurong Chen Ye Chen Ying Chen Yukai Chen Zelin Chen Zilin Chen Gang Chen Boping Chen Chunhui Chen Hok Chuen Cheng Huajie Cheng Shan Cheng Tongguang Cheng Yunlong Chi Pietro Chimenti Wen Han Chiu Guk Cho Ming-Chung Chu Xiaotong Chu Ziliang Chu Guglielmo Coloretti Andreas Crivellin Hanhua Cui Xiaohao Cui Zhaoyuan Cui Brunella D'Anzi Ling-Yun Dai Xinchen Dai Xuwen Dai Antonio De Maria Nicola De Filippis Christophe De La Taille Francesca De Mori Chiara De Sio Elisa Del Core Shuangxue Deng Wei-Tian Deng Zhi Deng Ziyan Deng Bhupal Dev Tang Dewen Biagio Di Micco Ran Ding Siqin Dingl Yadong Ding Haiyi Dong Jianin AGH University of Science and Technology Faculty of Physics and Applied Computer ScienceKrakow Anhui University HefeiAnhui Applied Physics Department Federal Urdu University of ArtsScience and TechnologyIslamabad Banaras Hindu University Institute of ScienceVaranasi Bandirma Onyedi Eylul University Bandirma Beihang University Beijing Beijing Computational Science Research Center Beijing Beijing Conveyi LTD Beijing Beijing Glass Research Institute Co. LtdBeijing Beijing Institute of Technology Beijing Beijing Normal University Beijing Brown University ProvidenceRI Budker Institute of Nuclear Physics Novosibirsk Cadi Ayyad University Laboratory of Fundamental and Applied PhysicsPolydisciplinary FacultyMarrakech Cairo University Giza Center for Theory and Computation National Tsing Hua UniversityHsinchu Central China Normal University WuhanHubei Central South University ChangshaHunan Centro de Fisica Teorica de Particulas Universidade Tecnica de LisboaLisboa Chengdu KaitengSifang Digital Radio&TV Equipment Co. LtdChengduSichuan China academy of engineering physics MianyangSichuan China building materials academy Beijing China Center of Advanced Science and Technology Beijing China Institute of Atomic Energy Beijing China Jiliang University HangzhouZhejiang China Nuclear Instrument CO. LTDBeijing China University of Geosciences Beijing China University of Geosciences WuhanHubei China University of Mining and Technology XuzhouJiangsu China West Normal University NanchongSichuan Chongqing University Department of PhysicsChongqing Chulalongkorn University Bangkok City University of Hong Kong Department of PhysicsHong Kong Cockcroft Institute Daresbury Cornell University IthacaNY CPPM(AMU/IPhU&CNRS/INP) Marseille Dalian Minzu University DalianLiaoning Dalian University of Technology Department of PhysicsDalian Deutsches Elektronen-Synchrotron DESY Hamburg Dzhelepov Laboratory of Nuclear Problems of Joint Institute for Nuclear Research(DLNP JINR) Dubna East China University Of Science And Technol

The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by China,fostered through extensive collaboration with international *** complex comprises four accelerators:a 30 GeV Linac,a 1.1 GeV Damping Ring,a Booster capable of achieving energies up to 180 GeV,and a Collider operating at varying energy modes(Z,W,H,and tt).The Linac and Damping Ring are situated on the surface,while the subterranean Booster and Collider are housed in a 100 km circumference underground tunnel,strategically accommodating future expansion with provisions for a potential Super Proton Proton Collider(SPPC).The CEPC primarily serves as a Higgs *** its baseline design with synchrotron radiation(SR)power of 30 MW per beam,it can achieve a luminosity of 5×10^(34)cm^(-2)s^(-1)per interaction point(IP),resulting in an integrated luminosity of 13 ab^(-1)for two IPs over a decade,producing 2.6 million Higgs *** the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons,facilitating precise measurements of Higgs coupling at sub-percent levels,exceeding the precision expected from the HL-LHC by an order of *** Technical design Report(TDR)follows the Preliminary Conceptual design Report(Pre-CDR,2015)and the Conceptual design Report(CDR,2018),comprehensively detailing the machine's layout,performance metrics,physical design and analysis,technical systems design,R&D and prototyping efforts,and associated civil engineering ***,it includes a cost estimate and a preliminary construction timeline,establishing a framework for forthcoming engineering design phase and site selection *** is anticipated to begin around 2027-2028,pending government approval,with an estimated duration of 8 *** commencement of experiments and data collection could potentially be initiated in the mid-2030s.

关键词： initiated exceeding precise

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An empirical study on randomized optimal area polygonization of planar point sets

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ACM Journal of Experimental Algorithmics 2016年第1期21卷 1–24页

作者： Peethambaran, Jiju Parakkat, Amal Dev Muthuganapathy, Ramanathan Department of Engineering Design Advanced Geometric Computing Lab Indian Institute of Technology Madras 600036 India

While random polygon generation from a set of planar points has been widely investigated in the literature, very few works address the construction of a simple polygon with minimum area (MINAP) or maximum area (MAXAP) from a set of fixed planar points. Currently, no deterministic algorithms are available to compute MINAP/MAXAP, as the problems have been shown to be NP-complete. In this article, we present a greedy heuristic for computing the approximate MINAP of any given planar point set using the technique of randomized incremental construction. For a given point set of n points, the proposed algorithm takes O(n² log n) time and O(n) space. It is rather simplistic in nature, hence very easy for implementation and maintenance. We report on various experimental studies on the behavior of a randomized heuristic on different point set instances. Test data have been taken from the SPAETH cluster data base and TSPLIB library. Experimental results indicate that the proposed algorithm outperforms its counterparts for generating a tighter upper bound on the optimal minimum area polygon for large-sized point sets. © 2016 ACM 1084-6654/2016/04-ART1.10 $15.00.

关键词： Convex n-gons Incremental algorithm Maximal area polygon Minimal area polygon Randomized algorithm

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Bidirectional controlled quantum teleportation using eight-qubit quantum channel in noisy environments

arXiv

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arXiv 2018年

作者： Sarvaghad-Moghaddam, Moein Ramezani, Zeinab Amiri, Is Quantum Design Automation Lab Amirkabir University of Technology Tehran Iran Department of Electrical and Computer Engineering Northeastern University BostonMA02115 United States Computational Optics Research Group Advanced Institute of Materials Science Ton Duc Thang University Ho Chi Minh City Viet Nam Faculty of Applied Sciences Ton Duc Thang University Ho Chi Minh City Viet Nam

In this work, a novel protocol is proposed for bidirectional controlled quantum teleportation (BCQT) in which a quantum channel is used with the eight-qubit entangled state. Using the protocol, two users can teleport an arbitrary entangled state and a pure two-qubit state (QBS) to each other simultaneously under the permission of a third party in the role of controller. This protocol is based on the controlled-not operation, appropriate single-qubit (SIQ) UOs and SIQ measurements in the .. and ..-basis. Reduction of the predictability of the controllerfs qubit (QB) by the eavesdropper and also, an increasing degree of freedom of controller for controlling one of the users or both are other features of this protocol. Then, the proposed protocol is investigated in two typical noisy channels include the amplitude-damping noise (ADN) and the phase-damping noise (PDN). And finally, analysis of the protocol shows that it only depends on the amplitude of the initial state and the decoherence noisy rate (DR). Copyright © 2018, The Authors. All rights reserved.

关键词： Degrees of freedom (mechanics)

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Technology and Economic Analysis of Sewage Source Heat Pump Combined Type District Heating Method

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Energy Procedia 2017年 142卷 1312-1318页

作者： Zhang Qunli Nie Qian Liu Fang Yin Chaohui Beijing Key Lab of Heating Gas Supply Ventilating and Air Conditioning Engineering Beijing University of Civil Engineering and Architecture Xicheng District Beijing 100044 China Beijing Advanced Innovation Center For Future Urban Design Beijing University of Civil Engineering and Architecture Xicheng District Beijing 100044 China

This paper puts forward a kind of compound district heating method for* recycling waste heat of wasting water for building heat supply. The way is to the sewage treatment plant and the district heating plant in combination with heating operation, through the sewage source heat pump system for recycling the sewage heat energy for urban heating system returns water preheating. Research results show that compared with the other two heating methods, under the same heat loading, the sewage source heat pump combined type district heating method has the advantages of high energy consumption, low operation cost, distance from heating and good suitability.

关键词： District heating Sewage source heat pump Primary energy utilization Technical economic analysis

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Analysis of Typical Energy Saving Technology in the Sewage Treatment Plant

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Energy Procedia 2017年 142卷 1230-1237页

作者： Qunli Zhang Donghan Sun Mingshuang Wang Chaohui Yin Beijing Municipality Key Lab of Heating Gas Supply Ventilating and Air Conditioning Engineering Beijing University of Civil Engineering and Architecture Xicheng District Beijing 100044 China Beijing Advanced Innovation Center For Future Urban Design Beijing University of Civil Engineering and Architecture Xicheng District Beijing 100044 China

There are a large amount of low-grade waste thermal energy in the sewage and abundant organic substances in the sludge. By making full use of the energy in these resources, which can complement or offset the energy consumed in the sewage treatment process, the sewage treatment plants can significantly reduce the amount of carbon dioxide indirect emissions. The goal of “carbon neutrality” in the sewage treatment plant can be achieved. The sewage source heat pump using sewage thermal energy can supply cooling and heating in the buildings; The sludge anaerobic digestion process can produce a lot of biogas for generating electricity; The photovoltaic power generation modules can compensate the heat and the electric consumption of the sewage treatment plant. Comparing and analyzing the differences of three technologies in aspects of energy saving, economic feasibility and carbon neutral, the research result shows that the best treatment method is the SSHP technology, which have energy saving potential by using low-grade waste thermal energy and is contributed to achieve “carbon neutrality” of the sewage treatment plant.

关键词： Sewage treatment plant Low grade heat source Sewage source heat pump Heating Carbon neutral

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Experimental study on the cooling charge and discharge characteristics of a PCM based fin-tube thermal energy storage exchanger

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Procedia engineering 2017年 205卷 3088-3095页

作者： Wen-ju Hu Mo-ning Chang Yan Gao Qun-li Zhang Ling-yan Yang De-ying Li Beijing Key Lab of HVAC Beijing University of Civil Engineering and Architecture Beijing 100044 China Beijing Advanced Innovation Center for Future Urban Design Beijing University of Civil Engineering and Architecture Beijing 100044 China China Academy of Building Research Beijing 100013 China

In view of the organic phase change materials (PCM)’s low thermal conductivity which was bad for heat transfer and storage, a kind of fin-tube thermal energy storage exchanger(TESE) was proposed. The experimental study was carried out for the cooling charge and discharge characteristics of a PCM based fin-tube TESE. Experiment results showed that the difference of thermal conductivity of PCM in the solid phase and the liquid phase, and thermal expansion and contraction existing during the phase transition, led to the phenomenon that PCM based fin-tube thermal energy storage exchanger’s cooling discharging rate was much higher than the charging rate, and the TESE showed good discharging characteristics of cooling. The cooling storage period of the fin-tube TESE was relatively long, and the suction and exhaust pressure of the compressor slightly decreased during the cooling storage process. Finally, the inlet water temperature of the PCM based fin-tube TESE influenced he cooling characteristics greatly, and the outlet water temperature increased linearly with time while the cooling rate decreased linearly.

关键词： fin-tube heat exchanger phase-change energy storage charge discharge characteristics of cooling

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Utilization Potential and Economic Feasibility Analysis of Bathing Sewage and its Heat Generated in Colleges and Universities

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Energy Procedia 2017年 142卷 1244-1250页

作者： Qunli Zhang Xingquan Fan Wenjing Zhang Zhiming Wang Beijing Municipality Key Lab of Heating Gas Supply Ventilating and Air Conditioning Engineering Beijing University of Civil Engineering and Architecture Xicheng District Beijing 100044 China Beijing Advanced Innovation Center for Future Urban Design Beijing University of Civil Engineering and Architecture Xicheng District Beijing 100044 China

The applicability of using sewage source heat pump to recover the waste heat from the public bathrooms in colleges and universities is analysed in this paper. Analysis shows that bathing sewage is very suitable for the waste heat recovery by using sewage source heat pump because of its suitable water flow, water temperature and water quality. At the same time, its utilization potential is analysed. Analysis shows that a great energy-saving and pollutant-reducing benefits will be made if those heat is recovered. Finally, technical and economic analysis of this system is done. Taking a university bathroom in Beijing as an example, this method is economic feasible and the payback period is 3.39 years.

关键词： bathing sewage utilization potential sewage source heat pump economic feasibility

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Probing Plasticity Mechanisms in Low Melting Temperature Metallic Nanostructures Using Synchrotron X-Ray Microdiffraction

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Procedia engineering 2017年 215卷 246-262页

作者： H.P. ANWAR ALI M. KUNZ N. TAMURA A.S. BUDIMAN Xtreme Materials Lab Pillar of Engineering Product Development Singapore University of Technology and Design (SUTD) 8 Somapah Road Singapore 487372 Singapore Advanced Light Source (ALS) Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

A nondestructive ex situ Synchrotron Laue X-ray Microdiffraction (µSLXRD) technique is used to investigate the plasticity mechanisms in the metallic nanostructures and their evolution at high homologous temperatures through analyzing low melting temperature metals such as tin. Without the use of expensive high temperature equipment, the current approach of studying plasticity mechanisms at high temperature is enabled by the low melting behaviors of the samples allowing them to provide insights on high temperature deformation mechanisms, such as thermally activated dislocation climbs. Nanopillars with a diameter near 1µm were deformed by uniaxial compression to strains of in excess of 20% at a strain rate of approximately 0.001s -1 . Defect density evolution in the nanopillars was evaluated by synchrotron Laue X-ray microdiffraction (µSLXRD) before and after deformation ( ex situ ). It was found from the Laue peak broadening measurements that there was no significant change in the dislocation density of the same pillar before and after such an extent of deformation. These findings were being compared to similar experimental results of indium and gold nanopillars (from our previous reports). They were found to be in stark contrast to our previous results with indium (although both are low melting temperature metals) where the synchrotron Laue X-ray microdiffraction showed significant peak broadening – before vs. after the uniaxial compression to a similar amount of deformation. It appears high temperature plasticity mechanism in tin nanostructures involves significant lattice diffusion behavior, as opposed to simple displactive behavior (through dislocation movements) that has been proposed in recent studies of tin nanostructures.

关键词： tin nanopillar plasticity dislocation microstructure

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