欧美小型电动机能效法规最新动态研究

欧盟和美国先后对小型电动机的能效要求出台强制性法规,分别于2009年、2010年正式实施。从主要内容和技术指标解读两项法规,重点研究欧美对于2.2kW以下的小型电动机的最低能效要求及我国相关国家标准要求的差异。在此基础上,提出应对两项法规的思路和建议。     

M701F型燃气轮机的在线运行负荷特性

分析了重型燃气轮机负荷特性的影响因素,提出了研究重型燃气轮机负荷特性的技术路线。基于此,针对某M701F型燃气轮机,以国际标准化组织(International Organization for Standardization,ISO)的标准条件为基准,由机组的在线运行数据获得其负荷特性曲线,并建立负荷特性的数学模型。考察该燃气轮机6 940组实际数据,得出结论:当折算基准功率不小于18MW时,其负荷特性数学模型的最大相对误差不超过5.73%。     

新型钻镗刀的应用

介绍了一种新型复合刀具——ECOCUT钻镗刀,以及该刀具在数控加工中与普通刀具的综合对比情况.     

Analysis of the energy performance of a ground source heat pump system after five years of operation

GeoCool plant was the result of a EU project whose main purpose was to adapt ground coupled heat pump technology to cooling dominated areas. The execution of this experimental plant was completed at the end of year 2004, starting on February 2005 the regular operation of the air conditioning system. Since then, GeoCool facility has been monitored by a network of sensors characterizing its most relevant parameters. Several aspects of the performance and behaviour of the system during its first operational year were presented on a previous paper. This paper presents the energy performance measurements of GeoCool ground coupled heat pump system acquired during five years of operation as well as the evolution of the return water temperature from the ground as a representative of the ground temperature. The analysis of the experimental results shows that the system energy performance is maintained through the years with no appreciable impact on ground thermal response.     

Basic actions to improve energy efficiency in commercial buildings in operation

Numerous studies have focused on improving energy efficiency in commercial buildings. Engineers and researchers have developed complex methods to improve energy efficiency, but buildings are often managed by non-specialised technicians who need understandable and cost-effective actions to implement in their buildings. This paper presents basic actions on which to base improvements in energy efficiency in commercial buildings in operation. Furthermore, obtained results and details of the implementation of these techniques in various buildings in the Universitat Politècnica de València are presented.     

Adaptive Online Voltage Scaling Scheme Based on the Nash Bargaining Solution

In an effort to reduce energy consumption, research into adaptive power management in real‐time systems has become widespread. In this paper, a novel dynamic voltage scaling scheme is proposed for multiprocessor systems. Based on the concept of the Nash bargaining solution, a processor's clock speed and supply voltage are dynamically adjusted to satisfy these conflicting performance metrics. In addition, the proposed algorithm is implemented to react adaptively to the current system conditions by using an adaptive online approach. Simulation results clearly indicate that the superior performance of the proposed scheme can strike the appropriate performance balance between contradictory requirements.     

Research status of key techniques for shock-induced combustion ramjet(shcramjet) engine

As one of the most promising propulsion systems in the future,shock-induced combustion ramjet engine can remedy the disadvantages in the integrated design of scramjet engine and airframe.It can shorten the length of the combustor,lighten the structure weight of the engine and keep better performance in a broad range of flight Mach number.The elementary principle of shock-induced combustion ramjet engine is introduced.The key technologies of this kind of propulsion system are described,while their research s...     

Experimental investigation on a parabolic trough solar collector for thermal power generation

Developing solar thermal power technology in an effective manner is a great challenge in China.In this paper an experiment platform of a parabolic trough solar collector system(PTCS) was developed for thermal power generation,and the performance of the PTCS was experimentally investigated with synthetic oil as the circulate heat transfer fluid(HTF).The solar collector's efficiency with the variation of the solar flux and the flow rate of the HTF was identified.The collector efficiency of the PTCS can be in ...     

提高全钢结构的结构效率实现钢结构的核心价值

首先,论述全钢结构的三大核心价值——最轻的结构、最短的工期和最好的延性;然后,阐述结构分类与创新;最后,对中、外大型全钢结构的结构效率进行了对比。说明全钢结构设计的关键是正确选择结构方案,方案选错,优化无用。