浅析大宁中央风井主通风机变频节能方案

介绍了华润大宁煤矿及矿井主要通风机现状,叙述了根据生产需要矿井通风系统发生的变化,进行了主通风机变频节能计算分析及投入产出成分分析.     

河南省能源行业碳足迹在产业间传递路径研究

以河南省部门能源消耗数据为例,利用投入产出法构建了河南省碳足迹投入产出模型,描绘出河南省各产业间碳排放的投入与产出关系,利用投入系数和产出系数,运用三角化方法识别出在碳排放上联系最密切的各个产业作为河南省能源产业碳足迹传递路径,由此分析了河南省能源产业碳排放的特点,提出以能源产业为切入点的节能减排思路.     

关注节能投入产出中的不协调问题

现阶段依靠市场手段推进节能难度大,主要是由于当前的节能投入产出关系中仍然存在一系列不经济、不协调、不匹配问题。本文从市场与政府、短期与长期、个体与集体、局部与全局、不同利益群体关系的视角出发,揭示了这些潜在的矛盾和问题,并提出了政策建议。     

多级热压式回热抽真空系统在1000MW火电机组中的应用

针对单背压1 000 MW火电机组真空系统优化节能研究及应用,文章介绍了一种以蒸汽喷射器为核心部件的多级热压式回热抽真空系统。结合机组50%THA、75%THA、100%THA三个实际运行工况,对采用水环式真空泵和三级喷射器抽真空系统两种方式进行对比分析,得出三级喷射器抽真空系统节能效果、经济效益明显,投入产出比效果好。     

与建筑完美结合的建材型太阳能系统

我国建筑能耗在27％以上,降低建筑对传统能源的消耗日益紧迫；以保温技术为主的节能技术经过三步阶段后,投入产出比增加；引入以太阳能为主的可再生能源的新型清洁供能体系势在必行；太阳能利用技术体系应作为新型建筑材料,完美实现与建筑的一体化设计。国内外进展太阳墙     

我国“十一五”节能目标的实现途径、条件与政策建议

本文包括两大部分:一是指出了部门能源强度的结构节能贡献与技术(效率)节能贡献之间的差别。二是通过调整最终产品(投资、消费、进出口)的比重以及部门间直接消耗系数的变化,应用投入产出模型,计算了2005～2010年5种(高、中、规划、粗放、20%节能)情景发展方案,得到的结果是:通过5年的努力,把投资与消费的比例调整到2000年水平,较大幅度提高产品的能源利用效率,优化产品结构,在此3个条件下,2010年20%节能目标是可以实现的。本文同时提出了实现此目标的若干政策建议。     

通讯

国家计委资源节约和综合利用司于1990年7月3日至5日,在辽宁省大连市召开了“节能管理与预测模型开发应用”交流会。从会上交流的情况看,目前我国节能管理和预测模型有以下几类:节能管理模型:(1)城市能源管理信息系统。分企业、市两个层次,或企业、局、市三个层次;(2)统计分析。以企业上报的统汁报表为主,按月定时分析所辖企业的能源以及水、原材料消耗的情况;(3)企业能源管理。以能源统计或审计为基础,根据投入产出方法,将节能降耗以及生产成本分析等有关数据进行收集、分析、整理;(4)数据库。根据国家、地方、部门、     

能源需求与二氧化碳排放分析决策支持系统

本文将情景分析思想和投入产出方法相结合,提出并设计开发了基于投入产出的能源决策支持系统;阐述了其设计原理及结构组成;通过对该系统的开发和应用表明,将情景分析和投入产出相结合为能源需求和相应二氧化碳排放预测提供了一条有效的途径。     

基于灰色关联度TOPSIS法的市级供电企业安全投入产出效果评价

电力企业进行安全投入会给企业带来经济效益及社会效益,对电力企业的安全投入产出进行评价,可为电力企业下一步的安全投入进行指导。基于市级供电企业的实际情况,从电力企业安全投入产出的减损效果、成本降低效果、投资收益效果等3方面选取了6个指标,采用灰色关联度改进的TOPSIS法建立了市级供电企业安全投入产出效果评价模型,并通过对西南某省9个地州市供电企业的安全投入产出效果进行评价,验证了模型的有效性。     

投入产出法在石化企业能源预测中的应用

简要介绍了企业实物型投入产出法的基本原理 ,并用投入产出法对某大型石化企业进行了生产结构和系统分析。利用此模型 ,通过给定各产品的指标来预测各种原料和能源的需求量     

Modelling of Heat Transfer in the Evaporator and Condenser of the Working Fluid in the Heat Pipe

The aim of this paper is to point out possible solutions to the further development of heat pipes by numerical modelling of phase-change heat transfer. Numerical modelling has now become a standard method that helps to reduce the economic costs of research and development of new and innovative devices. The article describes the procedures for using numerical simulation in phase-change heat transfer that occurs due to evaporation and condensation of the working fluid. The suggested procedure enables modelling of gravitational heat pipe under different changes in its geometry or under changes in the working fluid. From the simulation results we can find out how the heat pipe behaves under different geometric changes and how much heat output it transfers. The paper presents results obtained from modelling of heat pipes, such as classical gravitational heat pipe, heat pipe with capillary geometry, and closed loop pulsating heat pipe. The results gathered from numerical simulation of heat pipes were compared with measurement results.     

叶片动应力计算的重要改进及其在不调频叶片设计上的应用

叶栅流场中的叶片受流道中汽流力的作用，同时也承受了流道中谐波汽流力的激振。由于谐波汽流力沿周向波动，其对叶片的激振力应该是流道宽度内谐波激振力的积分。本着这一观念对ASME早期发表的动应力基本方程进行改进，重新作了推导，并指出了降低叶片共振应力的途径。多年来已取得了成功应用，其中涉及带冠单叶片的动强度特性及不调频叶片事故处理的材料综合抗振强度对比分析，对工程实践具有一定的参考借鉴的价值。     

美国车用替代燃料发展现状政策及启示

对美国车用替代燃料的动机和发展现状进行了总结和归纳,整理并研究了美国联邦政府和主要州政府支持车用替代燃料的政策和措施,最后结合中国的实际情况,提出了几点发展车用替代燃料的建议.     

固体氧化物燃料电池系统中冷凝器的设计应用

盘管式冷凝器是固体氧化物燃料电池发电系统中的必不可少的器件,电池堆排放的高温阳极尾气通过冷凝器后,可燃气体进入燃烧器再次燃烧,冷凝水进入蓄水箱供汽化器使用.通过对盘管式冷凝器换热过程的计算分析,提出了冷凝器的合理参数,优化了其结构,进一步提高了换热效率,降低了材料成本.     

Innovation and the price of wind energy in the US

In the last ten years, the wind energy industry has experienced many innovations resulting in wider deployment of wind energy, larger wind energy projects, larger wind turbines, and greater capacity factors. Using regression analysis, this paper examines the effects of technological improvements and other factors on the price of wind energy charged under long-term contracts in the United States. For wind energy projects completed during the period 1999–2006, higher capacity factors and larger wind farms contributed to reductions in wind energy contract prices paid by regulated investor owned utilities in 2007. However, this effect was offset by rising construction costs. Turbine size (in MW) shows no clear relationship to contract prices, possibly because there may be opposing factors tending to decrease costs as turbine size increases and tending to increase costs as turbine size increases. Wind energy is generally a low-cost resource that is competitive with natural gas-fired power generation.     

企业节约用电工作分析与实施

从企业用电系统的科学管理和技术改造两方面分析了企业节约用电的工作,介绍了企业节约用电工作实施方法,对相关的效益进行分析。     

Liberalisation and the security of gas supply in the UK

This paper contests the view held by the current UK government and its industry regulator, OFGEM, that liberalisation is good for security of supply. Focusing on the downstream aspects of the security of UK gas supply, on system security, it considers the impact of the different aspects of liberalisation: of legal governance, supply competition, de-integration, market simulation, regulation and the interaction of liberalised gas and electricity markets. Categorising these impacts in terms of security threats and threats to security response, it finds that individually and as a complex collectivity they have increased the risks of supply failure, either potential or already realised, in a variety of ways: from creating increased uncertainty and failing to signal adequate or appropriate investment, to legal ambiguity which divorces responsibility from liability and renders legal liability indeterminate ex ante. Moreover, one of the UK government’s responses to these increased dangers, which it does appear to perceive, is revealed as itself paralysed by the liberalisation paradigm: the government can only intervene pre-emptively with information in attempt to persuade the market to behave as it thinks it should. Meanwhile, however, the government has also had to recognise its default responsibility for security of supply and make preparations to intervene in an emergency situation: liberalisation can only be challenged when it is already too late.     

活塞动力学仿真及在拉缸分析中的应用

针对某型发动机开发实验过程中出现的拉缸现象,建立活塞一连杆组动力学模型,并进行数值仿真分析。通过一个工作循环的模拟,获得了活塞与缸套之间的接触应力及间隙、活塞在缸套中的瞬时运动特性,并与实验结果对比,找出拉缸产生的原因,为优化活塞外轮廓形线提供了理论依据。     

自然通风条件下建筑围护结构及室内空气的温度计算

建立太阳照射和自然通风条件下建筑与室内、外环境的空气平衡方程与热平衡方程,以及沿围护结构厚度的非稳态一维导热方程,求解得到建筑围护结构和室内空气的温度。选取广州夏季某一天的气象参数,计算围护材料分别采用钢筋混凝土、灰砂砖砌体、浮石混凝土、橡木和平板玻璃情况下,从7时至19时一单室建筑围护结构及室内空气的温度。     

Solar tower power plant in Germany and future perspectives of the development of the technology in Greece and Cyprus

Since the 80s power production with solar thermal power plants has been a way to substitute fossil fuels. By concentrating direct solar radiation from heliostats very high temperatures of a thermal fluid can be reached. The resulting heat is converted to mechanical energy in a steam cycle which generates electricity.High efficiencies and fast start-up are reached by using air as a heat medium, as well as using porous ceramic materials as solar receiver of the concentrated sunlight.In Germany the construction of a 1.5 MW_e solar tower power plant began in 2008. It is operational since December 2008 and started production of electricity in the spring of 2009.In Greece and Cyprus, countries with high solar potential, the development of this competitive solar thermal technology is imperative, since it has already been implemented in other Mediterranean countries.