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Implementation of a remote data logging system 实现了一个远程数据记录系统
Pub Date : 2014-04-01 DOI: 10.1109/DUE.2014.6827768
T. Figlan, L. Setlhogo, P. Prinsloo, M. Dekenah
Eskom is in the process of collecting load profile and other data towards the NRS034 Domestic Load Research Project. Their remote data logging system annually accumulates more than 300 mill date/time stamped measurands of household load per year from 650 households around South Africa. This paper describes the latest developments of the underlying remote data logging system used for load profiling certain customers. Over a number of years the data logging system has increased in scale, sophistication, accuracy and reliability. The elements of such a system must work smoothly to ensure availability and reliability of load data. With a constant increase in data loggers and changes to their software applications and related hardware, it is apparent logging systems are becoming increasingly more complex.
Eskom正在为NRS034国内负荷研究项目收集负荷概况和其他数据。他们的远程数据记录系统每年从南非650个家庭中收集超过3亿份带有日期/时间戳的家庭负荷数据。本文描述了用于某些客户负载分析的底层远程数据记录系统的最新发展。多年来,数据记录系统在规模、复杂性、准确性和可靠性方面都有所增加。这样一个系统的要素必须顺利工作,以确保负载数据的可用性和可靠性。随着数据记录器的不断增加以及其软件应用程序和相关硬件的变化,很明显,日志记录系统正变得越来越复杂。
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引用次数: 2
Optimising of a domestic paraffin geyser for rural application 国产石蜡间歇泉农村应用的优化
Pub Date : 2014-04-01 DOI: 10.1109/DUE.2014.6827756
M. Mathews, E. Mathews
A water heating system based on paraffin was investigated. Such a system fulfils a need in rural areas where electrify is not available and solar geysers are not practical. The solution is particularly apt due to the abundant use of paraffin in rural communities. The system was modelled for the previous conference and it was apparent that the product required some optimisation in order to be practical. The product was then optimised in terms of increasing the heat transfer area available and an improvement of 87% in terms of performance was achieved with an 8% reduction in cost to manufacture. This provided a solution that proved more practical when heating water to a suitable showering temperature of 38°C. A flow rate of 4.71/min with warmer summer water inlet conditions was achieved and 3.21/min with colder winter water inlet conditions. The product offers a great deal of versatility due to the nature of inline heat exchangers. It is possible to adjust the outlet water temperature by adjusting only the water flow rate. Thus the product can provide water at any range of temperature from a warm temperature for showering to boiling water.
研究了一种基于石蜡的水加热系统。这样的系统满足了农村地区的需求,那里没有电力供应,太阳能间歇泉也不实用。由于石蜡在农村社区的大量使用,该解决方案特别适用。该系统是为之前的会议建模的,很明显,该产品需要一些优化才能实用。然后对产品进行了优化,增加了可用的传热面积,性能提高了87%,制造成本降低了8%。这提供了一种解决方案,当将水加热到38°C的合适淋浴温度时,它被证明是更实用的。夏季较暖进水条件下的流量为4.71/min,冬季较冷进水条件下的流量为3.21/min。该产品提供了一个很大的通用性,由于内联热交换器的性质。只需调节出水流量即可调节出水温度。因此,该产品可以提供任何温度范围的水,从用于淋浴的温暖温度到沸水。
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引用次数: 0
Energy access and household risk transitions in South Africa 南非的能源获取和家庭风险转变
Pub Date : 2014-04-01 DOI: 10.1109/DUE.2014.6827757
D. Kimemia, H. Annegarn
Despite the commendable success in household electrification, energy poverty is still a challenge in South Africa [1], with many residents of low-income settlements unable either to afford or to access modern energy carriers. Energy related accidents such as shack fires and paraffin poisonings are a common phenomenon amongst poor communities, resulting in health and economic losses. This paper reports on two research projects that studied environmental risk transitions vis-à-vis energy poverty and the progress made in promoting modern energy access in South Africa. In the first project, the premise that energy poverty is a major determinant of energy incidents is tested with nationally representative household energy consumption surveys and hospital treatment data through quantitative analysis. The second project evaluated the impacts of an LPG intervention programme as a proxy for progress in modern energy access. Results indicate a positive non-linear relationship between poverty on one hand and the risk of injury from household energy use. The apparent household risk is generally much larger amongst nonelectrified households, especially those using a combination of paraffin and candles. Results show that access to LPG reduces energy expenditure and improves overall wellbeing of households. Policy interventions arising from these findings include a need for promotion of programmes that raise awareness of domestic energy safety issues within vulnerable communities, and national energy interventions to substitute paraffin with cleaner safer modern fuels.
尽管南非在家庭电气化方面取得了值得称赞的成功,但能源贫困仍然是南非面临的一个挑战[1],许多低收入定居点的居民既负担不起也无法使用现代能源载体。与能源有关的事故,如棚屋火灾和石蜡中毒,是贫穷社区的普遍现象,造成健康和经济损失。本文报告了两个研究项目,研究了-à-vis能源贫困的环境风险转变和南非在促进现代能源获取方面取得的进展。在第一个项目中,通过定量分析,利用具有全国代表性的家庭能源消费调查和医院治疗数据,对能源贫困是能源事件的主要决定因素这一前提进行了检验。第二个项目评估了液化石油气干预方案的影响,将其作为现代能源获取进展的代表。结果表明,一方面,贫困与家庭能源使用造成的伤害风险之间存在正非线性关系。在没有通电的家庭中,这种明显的家庭风险通常要大得多,尤其是那些同时使用石蜡和蜡烛的家庭。结果表明,使用液化石油气减少了能源消耗,改善了家庭的整体福祉。从这些调查结果中产生的政策干预措施包括需要促进提高脆弱社区对国内能源安全问题认识的方案,以及国家能源干预措施,以更清洁、更安全的现代燃料替代石蜡。
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引用次数: 2
Potentials of small hydro power in South Africa: The current status and investment opportunities 南非小水电潜力:现状与投资机会
Pub Date : 2014-04-01 DOI: 10.1109/DUE.2014.6827769
S. A. Ilupeju, F. Inambao
The economy of any country is highly dependent on the development of stable and adequate power generation. The need for power in Africa is increasing and the potential for power generation is substantial. Hydropower (HP), both large and small contributes about one-fifth of world electrical power. A survey output puts the number of small hydro power (SHP) potential sites in Kwa-Zulu Natal and Eastern Cape provinces at about 8 000. In South Africa HP generation is negligible as coal contributes about 90% of total energy generated while other sources contribute the remaining 10%. South Africa is ranked 12th in the world in terms of the top emitters of carbon dioxide, exposing dwellers to risks associated with this emission as a result of coal fired plants. It was predicted that the global demand for electrical energy will gradually rise and the growth for HP production is projected at 2.4%-3.6% from 1990 to 2020. SHP is considered to be one of the most cost effective and environmental friendly energy generation technologies available. With the availability, reliability and simplicity of SHP technology coupled with associated advantages, this paper is to set us on a new bearing toward its employment.
任何国家的经济都高度依赖于稳定和充足的发电的发展。非洲对电力的需求正在增加,发电的潜力很大。大大小小的水力发电(HP)贡献了世界五分之一的电力。一项调查结果显示,夸祖鲁-纳塔尔省和东开普省的小型水力发电(SHP)潜在场址数量约为8000个。在南非,HP发电量几乎可以忽略不计,因为煤炭占总发电量的90%左右,而其他能源占剩余的10%。南非在二氧化碳排放大国中排名世界第12位,由于燃煤电厂的排放,南非居民面临着与二氧化碳排放相关的风险。据预测,全球对电能的需求将逐渐上升,从1990年到2020年,HP产量的增长率预计为2.4%-3.6%。水力发电被认为是最具成本效益和环境友好的能源发电技术之一。由于源热泵技术的可用性、可靠性和简单性,加上其相关的优点,本文将为我们的应用开辟一条新的道路。
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引用次数: 6
Smart meter for renewable energy microgrid island 可再生能源微电网岛智能电表
Pub Date : 2014-04-01 DOI: 10.1109/DUE.2014.6827751
G. De Smedt, M. Adonis
This study chronicles the design and construction of a cost-effective smart meter for a student project. A traditional power grid sends power to the user, with no feedback and minimal measurement. The power provider either needs to check all the meters physically, or take rough estimates of usage. This can be inaccurate as well as draining on human resources. A Smart Meter is a technologically advanced meter which records energy usage on site and feeds the information back to the users and energy suppliers. This creates a feedback system that has many benefits; it adds intelligence to the grid and aims to manage electricity demand in a sustainable and economic manner. In 2007, the Smart Grid became federal law in the United States with the passing of the `Energy Independence and Security Act of 2007'. This paper details a few benefits of a Smart Grid and government's involvement in some countries. It also looks at the Standards required for Smart Grids. The paper then focuses on the different sections of a student designed meter.
本研究记录了一个具有成本效益的智能电表的设计和建设的学生项目。传统的电网向用户发送电力,没有反馈和最小的测量。电力供应商要么需要亲自检查所有仪表,要么粗略估计使用量。这可能是不准确的,而且会消耗人力资源。智能电表是一种技术先进的电表,可以记录现场的能源使用情况,并将信息反馈给用户和能源供应商。这创造了一个有很多好处的反馈系统;它为电网增加了智能,旨在以可持续和经济的方式管理电力需求。2007年,随着《2007年能源独立与安全法案》的通过,智能电网成为美国的联邦法律。本文详细介绍了一些国家智能电网和政府参与的一些好处。它还研究了智能电网所需的标准。然后,论文重点介绍了学生设计的节拍的不同部分。
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引用次数: 3
Simulation of solar absorption cooling system for a residential building in South Africa 南非某住宅建筑太阳能吸收式制冷系统模拟
Pub Date : 2014-04-01 DOI: 10.1109/DUE.2014.6827775
D. Luta, A. Raji, W. Fritz
In recent years, solar energy applications have been extended to HVAC systems in general and cooling systems in particular. Compared to conventional cooling systems, solar powered cooling technologies have the advantage of reducing the use of electricity from the grid thus saving energy and reducing the system operating cost. In addition, unlike conventional cooling technologies which present some concerns by the use of CFC (ChloroFluoroCarbon) and HCFC (HydroChloroFluoroCarbon) as refrigerants, solar powered cooling technologies do not lead to environmental concerns due to their fewer greenhouse gas emissions. In this paper, we have performed a simulation of solar absorption cooling system using INSEL software. The aim is to examine the performance of this type of cooling system and see if it can be suitable for a residential building located in Cape Town in the Republic of South Africa.
近年来,太阳能的应用已经扩展到一般的暖通空调系统,特别是冷却系统。与传统的冷却系统相比,太阳能冷却技术的优点是减少了对电网电力的使用,从而节省了能源,降低了系统的运行成本。此外,与使用CFC(氯氟烃)和HCFC(氢氯氟烃)作为制冷剂的传统冷却技术不同,太阳能冷却技术由于温室气体排放较少,不会导致环境问题。本文利用INSEL软件对太阳能吸收式冷却系统进行了仿真。目的是检查这种冷却系统的性能,看看它是否适用于位于南非共和国开普敦的住宅建筑。
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引用次数: 3
A load profile prediction model for residential consumers in South Africa 南非住宅用户负荷剖面预测模型
Pub Date : 2014-04-01 DOI: 10.1109/DUE.2014.6827763
S. Heunis, M. Dekenah
A revised model that estimates the load profiles for residential consumers in South Africa was developed and is described in this paper. Through the NRS 034 domestic load research programme a large number of load profiles of residential consumers from various Living Standards Measure (ie LSM) classes were collected. The load profiles are further described by a set of socio demographic indicators which is obtained through a front-door survey. A model that relates the hourly customer load profiles to household income, time electrified and region was developed and the output may be used in various planning activities, e.g. electrification design, network expansion planning, long term load forecasting etc. This analysis covers all data collected to end of 2011. A software implementation of the model is available which allows the user to obtain estimates of hourly profiles for different months given a set of input parameters.
一个修正的模型,估计负荷概况的住宅用户在南非开发,并在本文中进行了描述。通过NRS 034家庭负荷研究计划,收集了来自不同生活水平测量(即LSM)类别的住宅消费者的大量负荷概况。负荷概况进一步描述了一套社会人口指标,这是通过前门调查获得的。开发了一个将每小时客户负荷与家庭收入、电气化时间和地区联系起来的模型,其输出可用于各种规划活动,例如电气化设计、网络扩展规划、长期负荷预测等。本分析涵盖截至2011年底收集的所有数据。该模型的软件实现是可用的,它允许用户在给定一组输入参数的情况下获得不同月份的每小时概况的估计。
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引用次数: 29
Informal electricity re-selling — Entrepreneurship or exploitation? 非正规电力转售——创业还是剥削?
Pub Date : 2014-04-01 DOI: 10.1109/DUE.2014.6827750
Lana Franks, G. Prasad
People in informal settlements are among the poorest in South Africa. They live in overcrowded and badly constructed shack; many have no access to electricity, water or sanitation. The Integrated National Electrification Programme has connected some parts of informal settlements, but houses constructed on unproclaimed land did not - and will not under present regulations - receive an electricity connection from the municipality. They will remain in the dark. Enterprising shack dwellers with electricity connections use extension cords to supply current to nearby dwellings without access. Buyer and seller agree on a price, establishing a business of informal electricity re-selling. Households with meters connect up to three other households from three sockets of a “ready box.” Informal selling comes at a cost to both seller and buyer as the shared meter group can no longer benefit from subsidies such as Free Basic Electricity. This paper examines who benefits and who loses in the shared meter group and analyses the modalities and the cost of informal selling electricity to buyers and the benefit to sellers.
居住在非正式定居点的人是南非最贫穷的人之一。他们住在拥挤不堪的简陋棚屋里;许多人没有电、水或卫生设施。全国综合电气化方案已连接了一些非正式住区的部分地区,但是在未宣布的土地上建造的房屋没有- -而且根据现行条例也不会- -从市政当局获得电力连接。他们将被蒙在鼓里。有进取心的棚屋居民用延长线给附近没有电的房屋供电。买卖双方就价格达成一致,建立了一种非正式的电力转售业务。有电表的家庭通过一个“ready box”的三个插座与最多三个其他家庭相连。非正式销售对买卖双方都是有代价的,因为共享电表组无法再从免费基本电力(Free Basic Electricity)等补贴中受益。本文考察了共享电表组中谁是赢家谁是输家,并分析了向买方非正式出售电力的方式和成本以及对卖方的利益。
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引用次数: 7
Study and simulation of DC micro grid topologies in Caspoc Caspoc直流微电网拓扑研究与仿真
Pub Date : 2014-04-01 DOI: 10.1109/DUE.2014.6827760
W. Aerts, S. Willems, D. Haeseldonckx, P. van Willigenburg, J. Woudstra, S. De Jonge
As the impact of our actions on the climate become more and more clear and environmental awareness is rising, the quest for increasing efficiency and lower environmental impact becomes very important. Efficiency is particularly important in the field of electricity consumption, which keeps on rising as electrification of our transportation, houses, offices and more continues worldwide. These loads and sustainable sources have one thing in common: Direct Current. To successfully respond to this growing usage of direct current (DC) systems it is important to provoke an evolution in the provision of DC infrastructure. The goal of this paper is to create a methodology to calculate and evaluate the power losses in both traditional AC grids and DC microgrids. This is done through simulation models made by Caspoc, a software for modeling and simulating physical systems in analog/power electronics, electric power generation/conversion/distribution and mechatronics. The results are compared on the quantifiable indicator: energy savings. The impact of cable losses and different converters is calculated through the simulation. This methodology and simulation strategy can be the basis for the optimal grid design in other infrastructures and cases. The model will be validated with intensive tests of household equipment in a later stage of the project, this paper focuses on the model and methodology itself.
随着我们的行动对气候的影响越来越明显,环保意识也在提高,追求提高效率和降低对环境的影响变得非常重要。效率在电力消耗领域尤为重要,随着全球交通、住宅、办公室等领域的电气化不断推进,电力消耗也在不断上升。这些负载和可持续电源有一个共同点:直流电。为了成功应对直流(DC)系统日益增长的使用,重要的是要在直流基础设施的提供方面引发变革。本文的目标是创建一种方法来计算和评估传统交流电网和直流微电网的功率损耗。这是通过Caspoc制作的仿真模型完成的,Caspoc是模拟/电力电子、发电/转换/配电和机电一体化等物理系统建模和仿真的软件。结果在可量化的指标上进行了比较:节能。通过仿真计算了电缆损耗和不同变换器的影响。该方法和仿真策略可作为其他基础设施和案例中网格优化设计的基础。该模型将在项目后期通过家用设备的密集测试进行验证,本文重点关注模型和方法本身。
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引用次数: 6
Key differences of performance test protocols for household biomass cookstoves 家用生物质炉灶性能测试方案的主要差异
Pub Date : 2014-04-01 DOI: 10.1109/DUE.2014.6827753
Yixiang Zhang, Crispin Pernberton-Piqott, Zongxi Zhang, H. Ding, Yuguang Zhou, R. Dong
In this study, different ways of testing household biomass cooking stoves are compared and analyzed. The differences between test methods relate to the stove operation and data analysis methods, the fueling procedure, the end point selection, the choice of metrics and others factors. The influences of these differences were analyzed by using an induction heater. The results show the use of a pot lid or not, and the selection of the end point of the test have the greatest influence on the rated performance. Consequently test results provided by laboratories using different test methods will place the same stove-plus-fuel combination on significantly different performance `tiers'. Also the results show some metrics in popular tests should be reviewed. Some recommendations are provided for improving the accuracy and repeatability of test procedures and select metrics are defined for greater clarity.
本研究对家用生物质炉灶的不同检测方法进行了比较和分析。试验方法之间的差异涉及炉子操作和数据分析方法、加油程序、终点选择、指标选择和其他因素。利用感应加热器对这些差异的影响进行了分析。结果表明,是否使用锅盖,以及试验终点的选择对额定性能的影响最大。因此,使用不同测试方法的实验室提供的测试结果将把相同的炉子加燃料组合置于显著不同的性能“等级”上。结果还表明,应该对流行测试中的一些指标进行审查。为提高测试过程的准确性和可重复性提供了一些建议,并为更清晰地定义了选择度量。
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引用次数: 4
期刊
Twenty-Second Domestic Use of Energy
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