综合医院电气节能技术措施探讨

以降低A综合医院电能损耗为目的,通过测算空调系统、照明系统、医疗器械等用电负荷,分析医院电耗现状,探讨综合医院电气节能技术措施,有针对性采取更换LED照明、新增电梯电能回馈装置、更换新型节能变压器等措施。通过节电前后的数据对比分析,取得了较好的节电效果,为其他医院电气系统安全可靠、节能经济地运行提供参考。     

上海海龙光电科技有限公司 上海傲统光电科技有限公司

正海龙-傲统高透光球形荧光灯引领深化工业照明节电改造工业照明节电潜力巨大工业照明用电具有50%的节能空间,可少建2个三峡电站工业照明节电进入深水区要替代第二代节能光源石英金卤灯的难度更大,要求更高工业照明节电是螺旋式上升对工业照明节电的要求、技术支持和效果是在不断提高工业照明节电改造目标前两项已基本完成的任务:*采用节能灯替代白炽灯、高压汞灯*采用石英金卤灯替代高压汞灯、高压钠灯当前要抓紧完成的任务:*采用高透光球形荧光灯等新光源替代石英金卤灯     

防火防爆厂矿环境下高压气体放电灯节电技术研究及应用

高压钠灯是目前发光效率最高的人造光源,在防火防爆的厂矿环境中被大量使用,安全性要求高。灯具自带一体式防爆整流器箱(内装整流器、触发器),安全性密闭性好,但运行环境温度高散热差,故障率高能耗大。通过集控照明装置改造、优化安定器参数设计,做到镇流器免维护,使系统安全可靠性、稳定性大大提高,并有良好节电效益。     

照明节电措施

随着生产发展和人民生活水平的提高,照明用电量约占总电量的7—8%。因此,照明节电已成为节能工作的重要课题。照明节电有科学选用电光源和照明器,合理选定照度,降低线路损耗,加强照明管理等措施。一、采用节能电光源如何选用电光源是照明节电的重要环节。目前电光源的光效,寿命、显色性等都在不断提高,节能电光源不断出现。照明按发光原理可分两类:一是热辐射电光源。如白炽灯、卤钨灯。另一类是气体放电光源。如高压汞灯、钠灯、荧光灯。表1列出几种电光源的主要特性。     

LED光源在纺织行业的应用

照明电耗约占我国全部电耗的20%左右,"绿色"节电照明是节能的重要途径.文中介绍了LED光源的优越性,以LED光源在工业生产照明改造实例,经现场对比测试,印证了在纺织行业推广应用LED光源具有较大的节电潜力.     

高压钠灯电压优化及节电应用

根据高压钠灯在不同电压下的照度及寿命特性,推导出路灯半夜灯的最佳供电电压。通过对照明灯具从承受相电压变至线电压一半的自动转换,实现高压钠灯供电电压的优化,从而实现照明节电。     

节电简讯

为贯彻北京市关于进一步加强节约用电实施细则,挖掘节电潜力,北京化工机械厂投资17万元对全厂路灯照明设施进行了技术改造,收到明显节电效果。这个厂厂地面积较大,改造前多年使用白炽灯做为光源,造成电能消耗高,照明效果差,电压不稳,灯泡容易损坏等现象,全厂路灯照明负荷高达50KW。针对这些问题,这个厂首先更换照明灯具,将白炽灯改用低压纳灯,同时选用 DK     

太阳能发电在新农村中的应用探讨

为了探讨研究太阳能发电技术在新农村建设中的应用前景,本文以安徽省马鞍山市博望镇三杨村为研究对象,通过问卷调查和实地调研方法对该村的能源消费和建筑能耗等情况进行了解,并以太阳能光伏发电技术中的LED路灯照明系统为例,将新型太阳能LED路灯和传统高压钠灯系统在造价成本和节能减排等方面进行比较分析.结果表明:在造价成本方面,...     

广西城乡道路推用LED节能产品

正广西住建厅出台了《城市照明与建设管理工作方案》,全区市县大力推进城市照明建设和节能改造,年内基本完成城市中高能耗、高污染的汞灯、白炽灯等产品的淘汰改造,主要使用LED节能产品,确保实现年节电3%的目标。     

机械制造企业照明节电技术的应用

结合汽轮机厂的照明情况,说明机械制造企业照明节电必须与实际环境相结合,选用合适的照明灯具,阐述照明节电的方法、措施和效果,并举证照明节能案例。     

The benefits of the transition from fossil fuel to solar energy in Libya: A street lighting system case study

The Libyan economy is dominated by the oil and the gas industry which are considered as the primary energy sources for the generating power plants. With the increased energy demands in the near future, Libya will be forced to burn more oil and gas. This, in turn will result in reducing the country revenue, threatening the economy and increasing the CO₂ emission. This triggers the alarm for Libya to an urgent plan to diversify the energy sources through using sustainable energy. The sun showers Libya every day by a huge amount of sunshine, especially during the peaks in the summer days. Recently, the country has been struggling to satisfy its escalating energy demands. The residential and street lighting loads constitute more than 50% of the electricity demands in Libya. Street lighting consumes more than 3.996 TW h, which is around one fifth of the energy demands in Libya. Energy conservation and transition from fossil fuel to renewable energy could have significant profit on the energy sector in Libya. For example, Libya is still relying on the old-fashioned, inefficient and unsustainable street lighting systems. Replacing the old technology lighting systems with up-to-date solar powered lighting system can achieve energy saving and sustainability. In this paper, improving the energy situation in Libya through replacing the high pressure sodium street lighting systems with solar powered LED street lighting systems is investigated. A four km road is chosen as a case study. Four alternatives are analyzed; grid-powered high pressure sodium lamp street lighting system, grid-powered LED lamp street lighting system, stand-alone solar powered LED street lighting system and grid-connected solar powered LED street lighting system. The four options are compared in terms of the capital cost, maintenance cost, total cost, fuel cost and the CO₂ emission. Replacing the high pressure sodium lamp system with LED lamp system saves 75% of energy and reduces the CO₂ emission by 75%. The stand-alone solar powered LED lighting system cuts the CO₂ emission, saves the fuel and is economically feasible. Furthermore, improvement is attained if the solar powered lighting system is connected to the grid where the excess energy is fed to the grid. The two solar powered options are economically feasible and sustainable.     

Analysis of the performance of domestic lighting lamps

The power crisis problem is getting worse in the developing countries. Measures are being taken to overcome the power shortage problem by efficiently utilizing the available power. Replacement of high-power consumption lamps with energy efficient lamps is also among these steps. This paper presents a detailed comparative analysis between domestic lighting lamps (DLLs) use for producing artificial light. DLLs include incandescent lamp (IL), fluorescent lamp (FL) and compact fluorescent lamp (CFL). Light emitting diodes (LED) based lamp technology is relatively new in comparison with conventional incandescent and discharge lamps. However, the present study will also cover the LED lamps. Power quality based experiments have been conducted on DLLs in Power System Laboratory and power consumption based calculations are carried out using the lighting design software DIALux. The result shows that with the current technology, the use of FL and LED lamp is beneficial for utility as well as for consumer. However, with the current pace in the development of LED technology, it is possible LED lamps will lead the lighting market in the near future. The paper has also presented the uncertainties that exist in lighting market and proposed the guidelines that will help in making future energy policy.     

Economic feasibility of solar-powered led roadway lighting

The optical efficacy of light emitting diode (LED) has exceeded 72 lm/W in 2006. This implies that energy can be saved about 75%, as compared to mercury lamps widely used in roadway lighting. In some remote areas where the grid power cannot reach, independent solar-powered lighting using high-power LED provides a promising solution. However, the cost of solar photovoltaic device may cause the application of solar-powered LED roadway lighting to be not economically feasible.The present study investigates the design of the solar-powered LED roadway lighting using high-power LED luminaire (100 W) and estimates the installation cost for a 10 km highway with 2 lanes. LED luminaries are installed on both side of the road with staggered arrangement. The pole distance is 30 m. The cost comparison of LED lighting using grid and solar power with the conventional mercury lamps was carried out. It shows that the installation cost is 22 million USD for LED powered by grid power and 26 million USD for solar-powered. The total installation cost of conventional mercury lighting is 18 million USD. The excess cost of LED mainly comes from the cost of LED lamp and solar PV. But, the cost of power generation and electrical transmission line can be greatly reduced since about 75% energy was saved for LED. This permits the use of smaller copper wire and shorter line length for solar-powered system which in turn saves installation cost. The payback time for the excess investment of LED is 2.2 years for LED using grid power and 3.3 years for LED using solar power.     

推荐两种大功率LED室内照明驱动电路

LED日光灯最大优点是节能省电,其次是使用寿命长,但目前LED照明灯具在家庭中并未得到广泛应用,价格高是其主要原因.本文介绍两种家庭照明用LED驱动电路,可动手自己制作,也可在市面上买到,其制作安装成本相当低,可使大功率LED灯具在家庭照明领域得到普及推广.     

Modeling and optimizing a sub-centralized LED lamps provision system for rural communities

Providing clean and sustainable energy for all is an ever elusive challenge, especially encountered in remote and poor rural areas. Cost-effective solutions have been found through renewable energy systems (RES) which, when combined with specialized products like rechargeable lamps using light emitting diodes (LED), can provide the basic energy needs (lighting) of rural homes, while replacing fossil-fuel based energy sources (e.g. kerosene lamps). The investigation presents an LED lamps provision system which circumvents the cost and technical challenges that currently hamper LED lamps diffusion into communities. Based on an actual rural island case (Pangan-an Island, Philippines), a sub-centralized lamp rental and charging system was mathematically modeled and analyzed (analytically and numerically) to identify the optimal states and policies, along with the effects of certain parameters, which promote financial viability and supply sustainability. It was found that a dynamically optimized lamp(s) purchase policy yields better financial returns than a statically optimized policy. Furthermore, it was realized that a sub-centralized lamps rental approach can serve as a complementary energy provision system for rural electrification projects by providing for the lower-tier energy demand market of low income users within a community.     

Road lighting energy-saving system based on wireless sensor network

An intelligent wireless sensor network that is designed to save road lighting energy, while maintaining traffic safety, is presented. It consists of an array of nodes that may be installed on both sides of the road, being mutually separated by a few tens to a few hundreds of meters. Each node consists of (i) vehicle detection subsystem, (ii) wireless communications and control subsystem for message exchange between the neighboring nodes, and (iii) lighting subsystem. During the day, nodes are inactive, while during the night, they turn to an active mode enabling detection of passing vehicles and timely activation of road lighting. Upon detection of a passing vehicle, the node generates a wireless message. Neighboring nodes that receive the wireless message will turn on their road lighting. In order to prevent driver distraction, each lamp will be turned on at a safe distance ahead of the moving vehicle. In order to improve energy efficiency, the lights will be dimmed or turned off behind the passing vehicle. The proposed road lighting energy-saving (RLES) system, which combines advanced sensor and wireless communication technologies, is suitable for implementation both with existing high-intensity discharge (HID) lamps and new light-emitting diode (LED) lamps. Our analysis shows that the RLES system will pay off in less than a year when used with HID lamps, while pay-back period is less than two and a half years when used with LEDs.     

An overview of energy efficient solid state LED driver topologies

LED lamps are projected as prospective successors of incandescent lamps with high efficiency and a long lifetime. Therefore, there is a need to develop energy efficient LED driver topologies for achieving constant current regulation, despite the effects of temperature on the LED V-I characteristics. This paper presents the salient features of various LED driver topologies with a focus on power density, multi-string operation, renewable energy utilization, soft switching, optical wireless communication, reliability and size. The performance of the above topologies is analysed in terms of the number of components, converter switching frequency, galvanic isolation, power rating and efficiency. This paper takes a look at efficiency improvement methods while dwelling on aspects of lifetime and reliability prediction of LED drivers. The paper will anticipate some of the future trends associated with the adaptation of wide bandgap power semiconductor materials, smart LED lighting for the internet of things (IoT) and programmable LED lamp drivers. This detailed technology review is extremely useful for researchers, designers and engineers in choosing the right topology.     

Experimental study of using fuel cells in dwellings for energy saving lighting and other low power applications

The accompanying CO₂ and other greenhouse gas emissions have been identified as a primary cause of global warming and the demand for electricity is expected to rise sharply within two decades. New energy-efficient, environmentally friendly power systems are, therefore, urgently required to ensure a sustainable built environment and also to meet the current building regulation standards. Fuel cells provide a means of supplying electricity and improving the built environment. In this paper, two methods of producing home-made hydrogen are described. The performance of low cost proton exchange membrane (PEM) fuel cells in a building trial is evaluated. The PEM fuel cells have been tested to provide electricity for high illuminating light-emitting diode (LED) lamps in a dwelling. It is found that a small quantity of home-produced low-pressure hydrogen could power the LED lamps for several hours. Moreover, by introducing an appropriate electronic circuit, the power consumption by the LED lamp is reduced with an added advantage of increasing the number of light fittings. The results illustrate the energy savings that can be achieved. They also give important pointers to how the technology can be used safely in dwellings in tandem with other energy saving technologies in future.     

城市景观照明的节能方法

阐述了城市景观照明节能的重要性,介绍了节能方法:严格按城市照明专项规划进行设计方案优选、确保城市景观照明与周围环境协调统一;合理确定照度标准及照明功率密度值;光源、灯具和控制系统的选用;照明方式的确定;大力加强照明设施维护与管理、提高节能效果和防治光污染等问题。