盘点城市

近些年,河南城乡建设取得长足进步,给我们留下太多的惊喜和惊奇。花园多了,建筑高了,广场大了,道路宽了,河道治理了,污水少了,绿化率提高了……     

多媒体技术在小学数学教学中的作用

科学技术的日新月异发展,推动了素质教育的进程,多媒体技术已经走进了课堂,本文阐述了小学数学教学应用多媒体技术,激发了学生浓厚的学习兴趣,化解了教学重点难点,营造了良好的氛围,优化了课堂教学,提高了课堂教学效率。     

70 m以上空心高墩施工的温度应力应变控制

介绍了关家沟特大桥工程概况,分析了桥墩轴线的放样施工,提出了施工中消除温度影响的控制技术,并进行了理论计算,对该技术的现场应用情况进行了探讨,得出了该方法正确的结论,为同类工程积累了经验.     

聚合物改性砂浆耐久性的试验研究

正交试验表明,聚合物干粉改性砂浆相对普通砂浆,折压比增加了69%,粘结强度增长了22.48倍,最大渗透压增加了6个级别,失水率下降了34.8%,干缩率减少了16%,明显改善了砂浆性能.     

柴油发电机励磁绕组的改进

本文介绍了柴油发电机组励磁系统出现的故障及原因,设计了新的励磁装置,并制定了使用控制措施,通过实践检验,排除了类似故障,从而保证了工程施工的安全、质量、进度和效益,取得了较好的经济效益。     

大线径导线恒张力架设技术

研究了高速铁路大线径导线恒张力架设技术,分析了其原理、机械及技术,给出了整套架设方案,实践证明,采用该施工工艺后,提高了施工效率,节约了材料及其他费用,取得了非常理想的效果。     

易在河南

伏羲,中华民族人文始祖,是我国古籍中记载的最早的王,所处时代约为新石器时代早期,他根据天地万物的变化,发明创造了八卦,成了中国古文字的发端,也结束了“结绳纪事”的历史。他又结绳为网,用来捕鸟打猎,并教会了人们渔猎的方法,发明了瑟,创作了《驾辨》曲子。他的活动,标志着中华文明的起始,也留下了大量神话传说。     

多媒体-小学数学教学的得力助手

多媒体技术的发展使小学数学教学模式发生了根本性变化。课堂体现了学生的主体性原则,多媒体的应用丰富了教学内容,灵活了教学方式,点燃了学生思维的火花,提高了学生听课效率,有效解决了数学教学中的重难点,多媒体是小学数学教学的得力助手。     

大国重器 节能先锋——徐工集团2014成套绿色节能道路机械新品挺进东北

正此次徐工重磅推出的"先进、可靠、节能、高效"成套绿色节能道路机械,不但提高了能源利用率,减少了油耗,进而为用户大幅降低了成本,而且降低了排放,保护了环境,以"节能环保"优势在市场竞争中占据了主动地位。     

上海大宁灵石公园景观设计理念及共对周围环境的影响

1概述上海自20世纪90年代以来,大规模推进城市绿化建设,并陆续建成一批大型城市公共绿地,由此改善了城市生态环境,缓解了城市热岛效应,改变了城市环境面貌,提高了市民生活质量,提升了城市综合竞争力,充分发挥了公园绿地的环境效益、社会效益和经济效益。     

数据中心空调系统节能研究

针对数据中心空调系统能耗比例过高问题开展了一系列调研,指出了目前国内数据中心空调系统使用中存在的问题,针对这些问题从空调设备节能、气流组织优化和自然冷源合理利用三方面分析了相关的节能方法与手段,为数据中心空调系统的节能设计与改造提供参考和依据。     

数据中心机房新风送风状态点的分析

基于数据中心机房微正压的要求,针对新风系统的能耗控制措施在降低PUE值方面效果显著.新风系统能耗可通过确定系统所需的新风量、准确的新风送风状态点控制.其中,新风送风状态点的选取对新风系统能耗有直接影响.针对数据中心不同通道封闭情况、不同季节的新风处理过程进行了分析,得出了在不同情况下相对合理的机房新风送风状态点,为类似...     

Investigation of indoor climate and power usage in a data center

Thermal management of data centers is an important issue for many high technology companies. The power requirement to provide proper indoor climate in data centers is considerable. Thus, possibilities for energy savings and efficient electricity utilization are quite important. In this paper, the airflow and temperature patterns, as well as the electrical power requirement within a small data center, have been investigated.The power requirement within the data center is considerably high, due to an oversized air conditioning system. An infrared camera was used to visualize the airflow and temperature pattern, showing that cool air does not reach the upper levels of the racks, despite a very high air exchange rate. Point measurements of temperatures in a rack show that recirculation cells are present, causing accumulation of heat and improper cooling of electronic equipments. Thus, the chilled air is not distributed properly and consequently the cooling energy is not used effectively.     

Study of hot air recirculation and thermal management in data centers by using temperature rise distribution

One of the key challenges in reducing the energy consumption of data centers is to improve the efficiency of air conditioning units. The efficiency is increased when the temperature of the supply air rises; however, the hot air recirculation and hot spots may limit the rise of temperature of the supply air to ensure normal operation of servers. To solve this problem, the energy equation is modeled to separate the thermal influence of each server or rack, and the temperature rise distribution (TRD) is proposed to illustrate the recirculation efficiency in data centers. Based on the TRD, two recirculation ratios are suggested to evaluate the recirculation of each rack in the data center. An algorithm is suggested to optimize the power distribution among racks to minimize the maximum temperature inside the data center, reduce the number of hot spots, and provide more space for increasing the temperature of the supply air. The metrics and algorithm are tested and proved efficient by a computational fluid dynamics (CFD) case.     

探索数据中心空调系统的节能

随着数据中心的大规模发展,在保障数据中心稳定运行的前提下,减少空调系统能耗成为暖通空调设计师的首要任务。本文针对水冷冷水机组加自然冷却方案,给出了冷源系统的节能措施。分析了机房温湿度及新风量要求的节能潜力。结合具体工程案例,介绍了CFD模拟在气流组织分析中起到的节能作用。从部分负荷运行、冷源工况切换、主机房精密空调集中控制方面阐述了空调系统的节能控制。     

Can combining economizers with improved filtration save energy and protect equipment in data centers?

Economizer use in data centers is an energy efficiency strategy that could significantly limit electricity demand in this rapidly growing economic sector. Widespread economizer implementation, however, has been hindered by potential reliability concerns associated with exposing information technology equipment to particulate matter of outdoor origin. This study explores the feasibility of using economizers in data centers to save energy while controlling particle concentrations with high-quality air filtration. Physical and chemical properties of indoor and outdoor particles were analyzed at an operating northern California data center equipped with an economizer under varying levels of air filtration efficiency. Results show that when improved filtration is used in combination with an economizer, the indoor/outdoor concentration ratios for most measured particle types were similar to levels when using conventional filtration without economizers. An energy analysis of the data center reveals that, even during the summer months, chiller savings from economizer use greatly outweigh any increase in fan power associated with improved filtration. These findings indicate that economizer use combined with improved filtration could reduce data center energy demand while providing a level of protection from particles of outdoor origin similar to that observed with conventional design.     

数据中心空调设计初探

数据中心空调系统有别于常规舒适性空调系统．该类设施空调系统的负荷特点是显热负荷密度大、显热比高。就数据中心空调常用的设计参数、负荷特点及系统方式进行了简单探讨．并对我国数据中心空调系统设计发展进行了展望。     

Case study of data centers’ energy performance

This paper addresses the issue of energy performance of data centers by closely examining energy use of two data centers in commercial office buildings. The primary objective of the study is to examine an empirical energy use pattern of data centers under tropical climatic conditions, and give guidance for data centers’ design, operation and maintenance and retrofitting to achieve better energy performance. Actual energy use characteristics, design criteria, and energy and cost saving potentials were analyzed and compared between two data centers. Methodology of energy performance evaluation of data centers was discussed. The study concludes that data centers were high energy consuming areas in commercial office buildings—energy consumptions of approximately 3000 kWh/(m² year) and 2000 kWh/(m² year), respectively, were observed in the case studies. Power demands were often grossly over-provided in these facilities. This leaded to substantial increase in capital and running cost, which can be wasteful. Disparity in energy performance between case studies demonstrated the need for design guidelines and practical benchmarking. In one case study, approximately 56% (1.2 GWh/year) of energy consumption could be conserved through efficient designs of base infrastructure and energy consuming systems, as compared to better practice. The predicted cost saving is more than US$ 80,000 per year.     

数据中心工程给排水设计特点

数据中心设计包括建筑、结构、电气、空调、给排水等各专业设计,是一项系统工程,由于数据中心设计的特殊性和复杂性．特别强调各相关专业之间的协调配合。介绍对数据中心给排水专业国内外相关设计标准的认识和理解．诠释相关设计理念,希望能对数据中心电气设计人员有所帮助。     

数据中心液冷技术应用研究进展

液冷技术可提高散热密度、节能减排、降低数据中心的碳足迹,开展数据中心液冷技术的应用研究具有积极的科学意义.详细介绍了应用于数据中心的不同液冷技术及其冷却液.从冷却温度、节能效率、热回收性能3个方面对近年来国内外数据中心液冷技术的应用研究进展进行了综述,结果表明液冷技术冷却温度高,节能效果明显,具有优秀的热回收性能.指出...