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2011 World Congress on Sustainable Technologies (WCST)最新文献

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Sizing and selection of grounding transformers-decision criteria 接地变压器的尺寸和选择。判定标准
Pub Date : 2011-12-29 DOI: 10.1109/WCST19361.2011.6114236
G. Eduful, Godfred Mensah
Within a period of two years, the Electricity Company of Ghana (ECG) lost a total of six grounding transformers in a particular substation. The situation created a lot of instability and resulted in huge productivity losses to both the company and its customers. The failures were believed to be related to wrong selection of grounding transformer rating. However, using the concept of capacitive charging current of a system, it was found that the short time rating of the grounding transformers were rightly selected. Analysis of the phenomenon strongly linked the damages to protection deficiency. This paper discusses analysis of the problem and proposes decision criteria for selecting a grounding transformer.
在两年的时间里,加纳电力公司(ECG)在一个特定的变电站中总共损失了6台接地变压器。这种情况造成了很多不稳定因素,并导致公司和客户的巨大生产力损失。这些故障被认为与接地变压器额定值选择错误有关。然而,利用系统容性充电电流的概念,发现接地变压器短时间额定值的选择是正确的。分析这一现象与保护缺陷的损害密切相关。本文对该问题进行了分析,提出了选择接地变压器的判定标准。
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引用次数: 1
Comparison of statistical wind speed forecasting models 统计风速预报模式的比较
Pub Date : 2011-12-29 DOI: 10.1109/WCST19361.2011.6114238
P. Gomes, R. Castro
Wind power presented a remarkable growth in the first decade of the 21st century, highly sustained by the economical and ecological benefits of this technology. Not only has it significantly contributed to reduce the dependence on fossil fuels in the production of electrical energy, wind power has also allowed to save great amounts of greenhouse gases emissions. This growth leads to an inevitable also increasing impact of the wind energy - electrical energy produced making use of the wind resource - in the electrical system, which raises issues like network stability and the assurance of the supply to all loads connected to the electrical grid. An accurate forecast of the available wind energy for the forthcoming hours helps to perform a good planning and scheduling of the network, which minimizes the risks of this impact. Also, with the liberalization of the electrical markets worldwide, the wind power forecasting reveals itself important in order for the developers to estimate the correct bids to place in the respective market. This work addresses the issue of forecasting wind with two statistical models, the Autoregressive Moving Average and Artificial Neural Networks, making use of historical wind speed data. The basics of forecasting with these models are presented, and their forecasting performance is compared in two different case studies. Similar criteria are defined in order to adjust the required settings in both models. Finally, conclusions are drawn about the performance and the results obtained, considering the available data and the differences between the inherent characteristics to both models.
在21世纪的头十年,风力发电呈现出显著的增长,这种技术的经济效益和生态效益是高度可持续的。风力发电不仅大大减少了电力生产对化石燃料的依赖,而且还减少了大量的温室气体排放。这种增长不可避免地导致风能(利用风力资源产生的电能)对电力系统的影响日益增加,这引发了诸如网络稳定性和确保连接到电网的所有负载的供应等问题。对未来几小时内可用风能的准确预测有助于对电网进行良好的规划和调度,从而将这种影响的风险降至最低。此外,随着全球电力市场的自由化,风电预测显示出其重要性,以便开发商在各自的市场中估计正确的投标。本研究利用历史风速数据,利用自回归移动平均和人工神经网络两种统计模型来预测风的问题。介绍了这些模型预测的基本原理,并在两个不同的案例中比较了它们的预测性能。为了调整两个模型中的所需设置,定义了类似的标准。最后,考虑到现有数据和两种模型固有特征的差异,对性能和所得结果进行了总结。
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引用次数: 6
Managing oil drilling efficiency in bend drill pipes-an under actuated system perspective 弯曲钻杆的钻井效率管理——非驱动系统的视角
Pub Date : 2011-12-29 DOI: 10.1109/WCST19361.2011.6114252
F. Abdul Majeed, M. Karkoub, H. Karki, Y. L. Abdel Magid
Lateral vibrations are known to be the most destructive type of vibrations affecting rotary drilling. A whirling drill bit is one of the most prominent outcomes of lateral vibrations. Hence, it is imperative to research methodologies to minimize the drill bit whirl in order to maximize rotary drilling efficiency. Drill bit whirl can be either due to a bend drill string or due to the effect of an unbalanced drill bit. Both the cases lead to an in homogenous borehole which leads to increase in severity of the vibrations. This paper presents an analysis of the controllability of the drill bit whirl in bend drill pipes. Experimental tests conducted are analyzed and presented. The bit whirl due to drill bit bend is discussed as a probable special case of an under actuated system. A few typical under actuated system control issues are presented and the applicability of controllability solutions to the bend drill string whirl problem is discussed.
横向振动是影响旋转钻井的最具破坏性的振动类型。钻头的旋转是横向振动最突出的结果之一。因此,为了最大限度地提高旋转钻井效率,有必要研究如何减小钻头旋转的方法。钻头旋转既可能是由于钻柱弯曲造成的,也可能是由于钻头不平衡造成的。这两种情况都会导致井眼不均匀,从而导致振动的严重程度增加。本文对弯曲钻杆中钻头旋转的可控性进行了分析。对实验结果进行了分析和介绍。作为欠驱动系统的一种可能的特殊情况,讨论了由于钻头弯曲引起的钻头旋转。介绍了几个典型的非驱动系统控制问题,并讨论了可控性解决方案在弯曲钻柱旋转问题中的适用性。
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引用次数: 2
Communication technologies for an intelligent bus monitoring system 智能公交监控系统的通信技术
Pub Date : 2011-12-29 DOI: 10.1109/WCST19361.2011.6114234
M. A. Hannan, A. M. Mustapha, A. Hussain, H. Basri
This paper highlights the implementation of an intelligent bus monitoring system using radio frequency identification (RFID) and integrated sensing technologies such as global positioning system (GPS), general packet radio service (GPRS) and geographic information system (GIS) are used to monitor the movement of a bus. A new theoretical framework and ruled based decision algorithms are developed for the system. An experimental setup is developed for the prototype implementation. The results show that the choice of integrated technologies used in the system is suitable to monitor and manage a vehicle transportation system.
本文重点介绍了利用射频识别(RFID)和综合传感技术(如全球定位系统(GPS)、通用分组无线电服务(GPRS)和地理信息系统(GIS))来监控公交车运动的智能公交车监控系统的实现。提出了一种新的基于规则的决策算法和理论框架。为原型实现建立了实验装置。结果表明,该系统所采用的集成技术的选择适合于车辆运输系统的监控和管理。
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引用次数: 7
Intelligent analysis and design of heat pump based hybrid renewable energy systems operating in the Irish cool marine climate 基于热泵的混合可再生能源系统在爱尔兰凉爽的海洋性气候下运行的智能分析和设计
Pub Date : 2011-12-29 DOI: 10.1109/WCST19361.2011.6114247
Laurentiu Dimache, J. Lohan
Addressing concerns about security of energy supply, sustainability and climate change drives the shift towards greener economies based on a combination of energy efficiency and renewable energy systems. Although this transition is accelerating, many economic and technical challenges remain. The development of hybrid energy systems that combine two or more renewable sources have the potential to provide more cost effective and reliable renewable energy fraction when the appropriate size and combination of systems are utilized. This paper presents a methodology that employs artificial intelligence tools for data analysis in order to design and optimize systems that deliver low grade thermal energy to buildings and industrial applications operating in the Irish cool marine climate. The methodology uses measured weather and thermal energy consumption data from both a public building and an industrial process between 2008 and 2009. Results demonstrate significant capital cost reduction with multi-source hybrid systems and improved performance.
解决对能源供应安全、可持续性和气候变化的担忧,推动了以能效和可再生能源系统相结合为基础的绿色经济的转变。尽管这种转变正在加速,但仍存在许多经济和技术挑战。结合两种或多种可再生能源的混合能源系统的发展,当适当的规模和系统的组合被利用时,有可能提供更经济有效和可靠的可再生能源部分。本文提出了一种采用人工智能工具进行数据分析的方法,以便设计和优化系统,为在爱尔兰凉爽的海洋气候中运行的建筑和工业应用提供低等级热能。该方法使用了2008年至2009年间公共建筑和工业过程中测量的天气和热能消耗数据。结果表明,多源混合系统显著降低了资本成本,并提高了性能。
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引用次数: 3
Design principles for the development of coastal tourist settlements 沿海旅游聚落开发的设计原则
Pub Date : 2011-12-29 DOI: 10.1109/WCST19361.2011.6114215
S. P. Pieri, A. Zargli, I. Tzouvadakis
The following research is an effort to develop design principles for coastal tourist settlements depending on the relationship between the shape of a site, to its location and to its orientation. For that purpose, we use a figurative tourist complex as a comparison tool, covering typical cases of tourist development in coastal zones. The analysis is based on the principles of passive bioclimatic design using computer simulation processes. More specifically, by combining the ACAD software with the A-Lisp programming software, we produced the software called ROUTINA BIOCLIMA which dismantles and analyzes the digitized road network. The study, by considering the orientation of the streets as the primary factor, comes up with estimations about the quality of the built environment and the daylight distribution, in addition to conclusions about design decisions for the configuration of the touristic settlement in relation to the geomorphology of the soil, the duration and the intensity of local winds, the humidity and the amount of rainfall in the area in which it belongs to, as well as its relation to the waterfront.
下面的研究是根据场地的形状、位置和朝向之间的关系,努力制定沿海旅游聚落的设计原则。为此,我们使用一个比喻的旅游综合体作为比较工具,涵盖了沿海地区旅游发展的典型案例。该分析基于被动式生物气候设计原理,采用计算机模拟过程。更具体地说,通过将ACAD软件与A-Lisp编程软件相结合,我们制作了名为ROUTINA BIOCLIMA的软件,用于拆卸和分析数字化道路网络。这项研究中,通过考虑街道的方向的主要因素,提出了估计对建筑环境的质量和日光分布,除了结论设计决策的配置旅游结算与土壤的地貌,当地风的持续时间和强度,湿度和降雨量的地区,它属于海滨及其关系。
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引用次数: 1
Upgrading trap grease to an alternative to fossil fuel and its cost and GHG emissions 将疏水润滑脂升级为化石燃料的替代品及其成本和温室气体排放
Pub Date : 2011-12-29 DOI: 10.1109/WCST19361.2011.6114249
H. Kuramochi, M. Osako, K. Maeda, M. Fujii
Oils upgraded from trap greases were characterized to evaluate their possibility of replacing fossil fuel in terms of impurity content. The heating values of the oils were measured to clarify the input energy required for the upgrading process. The cost and GHG emissions for the present grease-to-oil process were estimated by using a logistic model.
从捕集器油脂升级的油进行了表征,以评估其在杂质含量方面取代化石燃料的可能性。测量了油的热值,以澄清升级过程所需的输入能量。使用logistic模型估算了目前油脂制油过程的成本和温室气体排放。
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引用次数: 0
Experimental analysis of effect of variation of convection heat losses on performance of parabolic dish collector with nickel chrome coated receiver 对流热损失变化对镀镍吸收体抛物面盘集热器性能影响的实验分析
Pub Date : 2011-12-29 DOI: 10.1109/WCST19361.2011.6114250
A. Sagade, N. Shinde
This paper reveals effect of variation of natural and forced convection heat losses on performance of prototype parabolic dish collector with black nickel chrome coated receiver. In general, concentrated solar collectors have high efficiency as compared to flat plate and parabolic trough type solar collectors. Therefore for water heating application high efficiency can be achieved. Design of solar parabolic dish collector consists of truncated cone shaped helical coiled receiver made up of copper at focal point. This prototype was evaluated for its performance during month of April and May 2010.
本文揭示了自然对流热损失和强制对流热损失的变化对黑镍铬涂层抛物面盘集热器原型性能的影响。一般来说,集中式太阳能集热器比平板集热器和抛物面槽集热器效率高。因此在水加热应用中可以达到较高的效率。太阳能抛物面盘集热器的设计是在焦点处由铜组成的锥形锥形螺旋盘状接收器。该原型机在2010年4月和5月进行了性能评估。
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引用次数: 3
Grid integration of wind-solar hybrid renewables using AC/DC converters as DG power sources 使用交/直流变流器作为DG电源的风能-太阳能混合可再生能源并网
Pub Date : 2011-12-29 DOI: 10.1109/WCST19361.2011.6114219
S. Jahdi, L. Lai, Daniel Nankoo
Renewable Energy Resources are best practices possible today to stand against increasingly risk of climate changes and global warming of the world and the most important sources of such types of resources of energies can be Wind and Solar energies which are most the efficient relatively. These clean power resources are used as in Distributed Generation (DGs) units technology to be defined as newer sources of power, which are in direct relation with the use of micro and smaller in capacity power generating units that are installed in distribution part of each power combined system or all the possible locations that loads and energy consumers are concentrated. Hybrid systems are of different states. One of the practices possible to provide these hybrids is combination of grid connected wind turbines and solar photovoltaic generators that together each could sit instead of the other one in a grid connection state when one of them cannot generate the required electricity for consumption by load properly. Moreover, Solar cells can generate the electricity required in the day while wind turbines can compensate the needs in the night by wind energy. This is exclusively where solar cells have gained more important effects in electricity generation of the world. They are consisting of a sort of assembly of different cells together to form a flat photovoltaic system to absorb the photons and generate electricity by electrons energized in the circuit. On the other hand, Systems for conversion of energy of wind, use Permanent Magnet Synchronous Generators that are usually installed to generate electricity. Recently, wind turbines are even improved to VSD drives from constant speed generators which provides the machine the ability of generation based on cases that rotational speed varies with changes in speed of wind and that means better contributions for flexibility. These simplified hybrid systems are provided and Simulations are done to confirm expectation outcomes of this connection.
可再生能源是当今应对日益增加的气候变化和全球变暖风险的最佳做法,这类能源资源的最重要来源可以是风能和太阳能,它们相对来说效率最高。这些清洁能源在分布式发电(dg)机组技术中被定义为新的电力来源,它与安装在每个电力组合系统的配电部分或所有可能的负荷和能源消费者集中的位置的微型和小容量发电机组的使用直接相关。混合系统具有不同的状态。提供这些混合动力的一种可能的做法是将并网的风力涡轮机和太阳能光伏发电机结合在一起,当其中一个不能产生所需的电力供负荷正常消耗时,它们可以代替另一个处于并网状态。此外,太阳能电池可以产生白天所需的电力,而风力涡轮机可以通过风能来补偿夜间的需求。这是太阳能电池在世界发电中获得更重要影响的唯一地方。它们是由一种不同的电池组合在一起形成一个平面的光伏系统来吸收光子,并通过电路中的电子产生电能。另一方面,风能转换系统,使用永磁同步发电机,通常安装发电。最近,风力涡轮机甚至从恒速发电机改进为VSD驱动,使机器能够根据转速随风速变化的情况发电,这意味着更好的灵活性贡献。给出了这些简化的混合系统,并进行了仿真,以验证该连接的预期结果。
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引用次数: 22
Ethylene glycol and ethanol synthesis from dimethyl oxalate hydrogenation on the Cu/ZnO/SiO2 catalysts Cu/ZnO/SiO2催化剂催化草酸二甲酯加氢合成乙二醇和乙醇
Pub Date : 2011-12-29 DOI: 10.1109/WCST19361.2011.6114228
Xinbao Li, Shurong Wang, Lingjun Zhu, Q. Yin, Xiaolan Ge, Zhong-yang Luo
Ethylene glycol (EG) synthesis from dimethyl oxalate (DMO) hydrogenation is a sustainable method compared with the production by petrochemical technology. The Cu/ZnO/SiO2 catalysts prepared by deposition precipitation method have been characterized by XRD, SEM, H2-TPR, and N2 physisorption. Under optimum reaction conditions, a DMO conversion of 100% and EG selectivity of 98% was obtained on the CuZn-5 catalyst. The present work also demonstrates a feasibility method to produce ethanol from DMO hydrogenation. On the catalyst of CuZn-15, the conversion of DMO can reach to 99% with the ethanol selectivity of 64% under the optimized reaction conditions.
草酸二甲酯(DMO)加氢合成乙二醇(EG)是一种可持续的合成方法。通过XRD、SEM、H2-TPR、N2物理吸附等手段对沉积沉淀法制备的Cu/ZnO/SiO2催化剂进行了表征。在最佳反应条件下,在CuZn-5催化剂上的DMO转化率为100%,EG选择性为98%。本研究还证明了DMO加氢制乙醇的可行性。在CuZn-15催化剂上,优化反应条件下,DMO的转化率可达99%,乙醇选择性为64%。
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引用次数: 1
期刊
2011 World Congress on Sustainable Technologies (WCST)
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