Performance analysis of an industrial waste heat‐based trigeneration system

The thermodynamic performance of an industrial waste heat recovery‐based trigeneration system is studied through energy and exergy efficiency parameters. The effects of exhaust gas inlet temperature, process heat pressure, and ambient temperature on both energy and exergy efficiencies, and electrical to thermal energy ratio of the system are investigated. The energy efficiency increases while electrical to thermal energy ratio and exergy efficiency decrease with increasing exhaust gas inlet temperature. On the other hand, with the increase in process heat pressure, energy efficiency decreases but exergy efficiency and electrical to thermal energy ratio increase. The effect of ambient temperature is also observed due to the fact that with an increase in ambient temperature, energy and exergy efficiencies, and electrical to thermal energy ratio decrease slightly. These results clearly show that performance evaluation of trigeneration system based on energy analysis is not adequate and hence more meaningful evaluation must include exergy analysis. The present analysis contributes to further information on the role of exhaust gas inlet temperature, process heat pressure, ambient temperature influence on the performance of waste heat recovery‐based trigeneration from a thermodynamic point of view. Copyright © 2009 John Wiley & Sons, Ltd.     

变频调速技术的应用与节能

介绍了变频调速技术的特点。分析、比较并列举了变频调速技术在工业 和民用领域中的几个应用实例。同时，也描述了他们的性能及节能效果。     

当前扁平材与长材轧制领域的几个热点技术

针对当前国际钢铁生产形势和国内大量扁平材与长材新产能投产的情况，分析了国内外扁平材及长 材生产的几项关键技术，如轧钢加热中的节能减排技术、氧化铁皮的清除和控制技术、中厚板形状控制技术、热轧材表面质量自动检验技术%热轧板带的板形控制技术、热镀锌生产线上的焊接接备及焊缝质量监测技术和电镀锌钢板表面粗糙度控制技术等#并指出我国轧钢行业要以精益求精、关注细节、一丝不苟的精神抓紧消化，吸收并熟练运用这些成熟的尖端技术#才能稳定盈、利地生产出全球顶级产品。     

Will energy regulations in the Gulf States make buildings more comfortable – A scoping study of residential buildings

Building envelope impacts upon energy consumption and indoor environment. The relationship between envelope components and indoor environment has become increasingly important, especially with the new emphasis on visual comfort, thermal comfort and indoor air quality. This paper examines the interaction between occupant thermal comfort and envelope component regulations in the Gulf States. The country chosen for this study is the Kingdom of Bahrain, the smallest country in the Gulf region. Simulation results and comparative studies were employed to investigate the impact of the current envelope component regulations on the internal environment. The paper focuses on residential buildings and concludes that the envelope component regulations contribute positively to the internal thermal performance. Although these envelope components are not generally the primary elements that impact upon internal thermal comfort there are circumstances when the components become very warm and occupants positioned close to them will experience discomfort. This paper shows that the thermal insulation regulation makes a small impact on thermal comfort, whereas the window regulation, particularly glazing, is more influential and that for most window areas, solar impacts are generally large.     

台湾氢能燃料电池产业之发展

由于氢能具有无污染、安全度高等特点,随着能源供需及国际高油价情势的演变,已被国际能源总署(IEA)规划为未来主要的能源利用形态。基于对降低温室气体排放与空气污染,台湾因具机车与电子产品生产优势,在推动燃料电池应用方面,亦积极投入小型质子交换膜燃料电池发电系统之研发,目前已建立1kW移动式燃料电池发电系统、3kW及5kW多重进料重组器之热电共生燃料电池发电系统;在3C电子产品DMFC应用方面也有很好的成果。     

A Study on Glutaric Acid Extraction by Tridodecylamine: Equilibria and Models

The extraction of glutaric acid was studied using tridodecyl amine (TDA) with respect to the functional groups of the diluent. The diluents studied were 1‐octanol (alcohol), methyl isobuthyl ketone, MIBK (ketone), and toluene (aromatic hydrocarbon) and these were used to dilute the TDA. The experimental results of batch extraction experiments are reported as distribution coefficients, D_C, loading factors, Z, and extraction efficiency, E. All measurements were carried out at 298.15 K. The results of the liquid‐liquid equilibrium measurements are correlated by a linear solvation energy relationship (LSER) model that takes into account physical interactions and modified Freundlich and Langmuir equations. The experimental results are compared with model results.     

新型洗衣机能效测试方法探讨

本文主要基于洗衣机能效国标GB/T 4288-2008,结合平时在洗衣机测试中的积累,通过分析计算两种三桶洗衣机的测试结果,给出能效测试方法的建议。     

储能电容电压输出电流双环控制准Z源逆变器

此处深入研究了一种新颖的单级电压型准Z源逆变器的储能电容电压输出电流双环控制策略,得到了重要结论,给出控制系统的设计步骤。1 kVA,90~110 V/220 V,50Hz逆变器仿真和原理实验结果表明,该逆变器具有单级功率变换,升压比大,变换效率高,储能电容电压稳定,并网电流质量高等优点。     

Throwing New Light on the Reduction of CO2

While the chemical energy in fossil fuels has enabled the rapid rise of modern civilization, their utilization and accompanying anthropogenic CO₂ emissions is occurring at a rate that is outpacing nature's carbon cycle. Its effect is now considered to be irreversible and this could lead to the demise of human society. This is a complex issue without a single solution, yet from the burgeoning global research activity and development in the field of CO₂ capture and utilization, there is light at the end of the tunnel. In this article a couple of recent advances are illuminated. Attention is focused on the discovery of gas‐phase, light‐assisted heterogeneous catalytic materials and processes for CO₂ photoreduction that operate at sufficiently high rates and conversion efficiencies, and under mild conditions, to open a new pathway for an energy transition from today's “fossil fuel economy” to a new and sustainable “CO₂ economy”. Whichever of the competing CO₂ capture and utilization approaches proves to be the best way forward for the development of a future CO₂‐based solar fuels economy, hopefully this can occur in a period short enough to circumvent the predicted adverse consequences of greenhouse gas climate change.