2018 5th International Symposium on Environment-Friendly Energies and Applications (EFEA)最新文献_第2页

Utilization of Hydrogen Sulfide from Biogas Installation 沼气装置中硫化氢的利用

2018 5th International Symposium on Environment-Friendly Energies and Applications (EFEA) Pub Date : 2018-09-01 DOI: 10.1109/EFEA.2018.8617104

R. Velichkova, D. Markov, I. Simova, P. Stankov, Zahari Ketipov, T. Petrova, I. Naydenova, R. Angelova, A. Wierling

引用次数: 1

The Orientation Effect of the Agricultural Tunnel Greenhouse on Aerodynamic and Energy Properties 农业隧道温室朝向对空气动力和能量特性的影响

2018 5th International Symposium on Environment-Friendly Energies and Applications (EFEA) Pub Date : 2018-09-01 DOI: 10.1109/EFEA.2018.8617097

M. Aissa, S. Bezari

{"title":"The Orientation Effect of the Agricultural Tunnel Greenhouse on Aerodynamic and Energy Properties","authors":"M. Aissa, S. Bezari","doi":"10.1109/EFEA.2018.8617097","DOIUrl":"https://doi.org/10.1109/EFEA.2018.8617097","url":null,"abstract":"The aim of this present numerical study is to investigate the effect of solar radiation intensity and the variation of the wind velocity direction on the inside greenhouse temperature profile. The very important aerodynamic phenomenon which can be highlighted in this work, is to distinguish the three known laminar, transitory and turbulent air flow patterns and their simultaneous influence on temperature behavior that have compared with drag coefficient evolution according to Reynolds number variation. Using the Fluent software to resolve our problem aero-dynamical and thermal variation phenomena that occurred in the greenhouse environment have been combined. Where, the finite volume method was adopted to carry out the fullness elliptic partial differential equation problem. Where, the three dimensional mesh grid has been used to determine the computational domain geometry of the greenhouse section, moreover the external medium around the bluff body. The numerical study of the agricultural tunnel greenhouse exposed to a three-dimensional of air flow taken account in this work has been considered with two directions longitudinal and transversal at different values of the wind speed. The evolution of the temperature inside the greenhouse is influenced by the latter. Furthermore, the drag coefficient evolution with the wind velocity has been studied, and found in good agreement with the literature.","PeriodicalId":447143,"journal":{"name":"2018 5th International Symposium on Environment-Friendly Energies and Applications (EFEA)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126338152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Sequence Circuit-Based Modeling of a Doubly Fed Induction Wind Generator for Eccentricity Diagnosis by Split-Phase Current Signature Analysis 基于分相电流特征分析的双馈风力发电机偏心诊断序列电路建模

2018 5th International Symposium on Environment-Friendly Energies and Applications (EFEA) Pub Date : 2018-09-01 DOI: 10.1109/EFEA.2018.8617074

C. Bruzzese, F. Trentini, E. Santini, G. Joksimović

{"title":"Sequence Circuit-Based Modeling of a Doubly Fed Induction Wind Generator for Eccentricity Diagnosis by Split-Phase Current Signature Analysis","authors":"C. Bruzzese, F. Trentini, E. Santini, G. Joksimović","doi":"10.1109/EFEA.2018.8617074","DOIUrl":"https://doi.org/10.1109/EFEA.2018.8617074","url":null,"abstract":"A wound-rotor three-phase induction generator with eccentric rotor and parallel connections in both stator and rotor can be represented by five equivalent sequence-circuits of virtually centered-rotor machines, as mathematically proved in previous papers. The five circuits allow the calculation of stator and rotor fault-related currents, in form of 2(p±1)-pole space vectors for 2p-pole machines. The formal calculation of fault-related currents is very useful to define fault indicators and tools for diagnosis, and in case of parallel-connected stators (like in many wind generators) the split-phase current signature analysis becomes viable. In fact, by reversing the equations linking split-phase current amplitudes and eccentricity degrees, original fault indicators are carried out in this paper. The new indicators are validated by simulations of a 1800kW wind induction generator with static, dynamic, and mixed faults in full-load conditions. The simulations are carried out by using a full FEA model of the motor, implemented by time-stepping FEM-circuit co-simulation software (Maxwell-Simplorer). A good match is obtained between theoretical calculations and simulations.","PeriodicalId":447143,"journal":{"name":"2018 5th International Symposium on Environment-Friendly Energies and Applications (EFEA)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126087612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Distributed Double Auction for Peer to Peer Energy Trade using Blockchains 使用区块链进行点对点能源交易的分布式双重拍卖

2018 5th International Symposium on Environment-Friendly Energies and Applications (EFEA) Pub Date : 2018-09-01 DOI: 10.1109/EFEA.2018.8617061

S. Thakur, B. Hayes, J. Breslin

引用次数: 51

Sustainability in the Network Development Plan: Systemic Sustainability and Stakeholder Engagement 网络发展计划中的可持续性:系统可持续性和利益相关者参与

2018 5th International Symposium on Environment-Friendly Energies and Applications (EFEA) Pub Date : 2018-09-01 DOI: 10.1109/EFEA.2018.8617114

C. Vergine, F. Scavo

引用次数: 0

Electrical Drives with Active Rectifiers Connected to Distorted Utility Grid 带有源整流器的电气驱动器连接到扭曲的公用事业电网

2018 5th International Symposium on Environment-Friendly Energies and Applications (EFEA) Pub Date : 2018-09-01 DOI: 10.1109/EFEA.2018.8617093

L. Ristic, B. Brkovic, M. Majstorovic, Uroš Milović, Tufik Taluo, M. Bebic

{"title":"Electrical Drives with Active Rectifiers Connected to Distorted Utility Grid","authors":"L. Ristic, B. Brkovic, M. Majstorovic, Uroš Milović, Tufik Taluo, M. Bebic","doi":"10.1109/EFEA.2018.8617093","DOIUrl":"https://doi.org/10.1109/EFEA.2018.8617093","url":null,"abstract":"The paper presents analysis of active rectifier application in electrical drives in order to improve energy efficiency. Recuperation of braking energy in drives with vertical transport of load, as well as during the speed reduction within high inertia drives present the most decisive factors for active rectifiers application. The power factor to the grid is approximately equal to unit, but can be adjusted differently if necessary to dynamically compensate for the reactive power of other consumers connected to the same bus as drive with active rectifier. This is only possible if there is an adequate reserve in the power of the inverter. One of the major issues concerning the active rectifier is its operation under distorted grid voltages, due to harmonics or unbalances, which inflict large low-order harmonics in the output voltage and input currents. Although listed advantages make an active rectifier the best choice for high performance electrical drives, the mitigation of low order harmonics in grid currents under different kinds of distortions and unbalances is still a problem analyzed in research community, as well as in the paper.","PeriodicalId":447143,"journal":{"name":"2018 5th International Symposium on Environment-Friendly Energies and Applications (EFEA)","volume":"139 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115191248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The Doubly-Fed Induction Generator as Part of the Electrical Machines Curriculum 作为电机课程一部分的双馈感应发电机

2018 5th International Symposium on Environment-Friendly Energies and Applications (EFEA) Pub Date : 2018-09-01 DOI: 10.1109/EFEA.2018.8617054

G. Joksimović, C. Bruzzese

引用次数: 1

Investigation of a Full Scale, Mechanical Pretreatment for Enhanced Biomethane Production from Giant Reed (Arundo Donax) 芦苇强化生物甲烷全规模机械预处理研究

2018 5th International Symposium on Environment-Friendly Energies and Applications (EFEA) Pub Date : 2018-09-01 DOI: 10.1109/EFEA.2018.8617058

P. Dell'Omo, V. Spena, Sabatino La Froscia

{"title":"Investigation of a Full Scale, Mechanical Pretreatment for Enhanced Biomethane Production from Giant Reed (Arundo Donax)","authors":"P. Dell'Omo, V. Spena, Sabatino La Froscia","doi":"10.1109/EFEA.2018.8617058","DOIUrl":"https://doi.org/10.1109/EFEA.2018.8617058","url":null,"abstract":"The effects of an industrial scale, mechanical pretreatment were determined on the methane yield of Giant reed stems. The feedstock was pretreated using a two stages dry milling process and the experiments were performed for two different mass flow rates (600 and 900 kg h−1). Untreated and pretreated stems were both anaerobically digested in batch reactors under mesophilic conditions for 28 days. The cumulative biogas production from the pretreated materials exceeded 212 Nm3 t−1 of volatile solids, showing a 137% gain compared to the raw material. Such a gain resulted far above the known range for size reduction pretreatments. Processed stems also showed a significant decrease in the acid detergent fiber content. The specific electric energy requirement for pretreatment decreased from 97.8 to 76.5 kWh t−1 of processed material with increasing the mass flow rate. The net primary energy output from pretreated stems was enhanced by about 118% compared to the raw material. The cost for the extra energy produced by pretreatment was estimated at 0.034 € kWh−1, resulting fully compatible with the selling price for the electric energy produced from biogas in force in Italy.","PeriodicalId":447143,"journal":{"name":"2018 5th International Symposium on Environment-Friendly Energies and Applications (EFEA)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114729090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flatness-Based Control of Gas-Turbine Electric Power Generation Units 基于平面度的燃气轮机发电机组控制

2018 5th International Symposium on Environment-Friendly Energies and Applications (EFEA) Pub Date : 2018-09-01 DOI: 10.1109/EFEA.2018.8617071

G. Rigatos, N. Zervos, K. Busawon, P. Siano, M. Abbaszadeh

引用次数: 0

Barriers to the use of Low GWP Refrigerants in the Refrigeration and Air Conditioning Sector in Mauritius 毛里求斯制冷和空调行业使用低全球升温潜能值制冷剂的障碍

2018 5th International Symposium on Environment-Friendly Energies and Applications (EFEA) Pub Date : 2018-09-01 DOI: 10.1109/EFEA.2018.8617096

R. Dreepaul, K. Elahee

{"title":"Barriers to the use of Low GWP Refrigerants in the Refrigeration and Air Conditioning Sector in Mauritius","authors":"R. Dreepaul, K. Elahee","doi":"10.1109/EFEA.2018.8617096","DOIUrl":"https://doi.org/10.1109/EFEA.2018.8617096","url":null,"abstract":"This paper is concerned with the issue of phasing out of Hydrofluorocarbons (HFCs) in Mauritius following the Kigali amendments of the Montreal protocol. For this purpose, a gap analysis was carried out among the major stakeholders in the Refrigeration and Air Conditioning (RAC) sector in Mauritius concerning the introduction of environment friendly refrigerants. Based on the gap analysis, it was found that the most frequently used refrigerants in the sector were HFCs and, to a lesser extent, hydrochlorofluorocarbons (HCFC). However, because of their negative influence on the environment, natural refrigerants such as ammonia (NH3), carbon dioxide (CO2) and Hydrocarbons (HC), having minimal impact on the environment, are being considered. On the other hand, HFOs, a new family of synthetic refrigerants also having low GWP have just appeared on the market. While these refrigerants have several advantages in terms of energy savings and thermodynamic efficiency, they also presents some drawbacks related namely to safety and availability on the market. In this paper, we discussed the major gaps in the implementation of these aforementioned new alternatives (i.e. NH3, CO2, HC and HFOs). Additionally, we proposed some solutions to cater for these gaps. Finally, some conclusions are drawn on future possible policy and decision making with regards to the implementation of the above technology.","PeriodicalId":447143,"journal":{"name":"2018 5th International Symposium on Environment-Friendly Energies and Applications (EFEA)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124940467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1