纸品粘结用聚氨酯热熔胶的制备

采用不同相对分子质量的聚乙二醇(PEG)和甲苯二异氰酸酯(TDI)为原料制备了水溶性聚氨酯热熔胶。讨论了PEG相对分子质量、原料配比、TDI滴加温度、反应时间等对产品性能的影响。结果表明,当PEG8000∶PEG600∶TDI摩尔比为1∶1∶2.28、TDI滴加温度为60～70℃、反应时间为3h时,所得聚氨酯热熔胶软化点为72.5℃、剪切强度为2.668MPa、吸湿率为0.81%,胶丝水溶性优,适用于纸品的粘接,并有利于废纸的回收处理。     

Two-dimensional threshold voltage analytical modes of DMG strained-silicon-on-insulator MOSFETs

For the first time, a simple and accurate two-dimensional analytical model for the surface potential variation along the channel in fully depleted dual-material gate strained-Si-on-insulator (DMG SSOI) MOSFETs is developed. We investigate the improved short channel effect (SCE), hot carrier effect (HCE), drain-induced barrier-lowering (DIBL) and carrier transport efficiency for the novel structure MOSFET. The analytical model takes into account the effects of different metal gate lengths, work functions, the drain bias and Ge mole fraction in the relaxed SiGe buffer. The surface potential in the channel region exhibits a step potential, which can suppress SCE, HCE and DIBL. Also, strained-Si and SOI structure can improve the carrier transport efficiency, with strained-Si being particularly effective. Further,the threshold voltage model correctly predicts a "rollup" in threshold voltage with decreasing channel length ratios or Ge mole fraction in the relaxed SiGe buffer. The validity of the two-dimensional analytical model is verified using numerical simulations.     

地下热水的水化学资料在判断断层中的应用——以聊城市城区地热田为例

聊城市城区西部临清拗陷区地下热水在水平方向上的水文地球化学特征具有明显的块段性,大致可分为F2断裂以东和F2断裂以西两个块段,这两个块段地下热水在主要离子组分、微量元素和特征系数等方面均有一定差异。本文根据地下热水水化学资料,判断出了F2断裂的大致位置,同时从地下热水水化学特征的块段性差异和地下热水的变质程度两个方面说明了F2断裂的判断依据。     

An exergy application for analysis of buildings and HVAC systems

The paper presents an extended method for exergy analysis of buildings and Heating Ventilation Air Conditioning (HVAC) systems, according to an energy demand build-up model from the building side to the energy supply side. The HVAC systems comprise a thermal energy emission and control system, a thermal distribution system, an electricity distribution system and an energy conversion system. Energy and exergy that are required by a building and a HVAC system are posed into the external part and classified by different forms of energy carriers. The external part is out of the boundary of the study. The method is illustrated with an office building equipped with low-temperature heating and high-temperature cooling systems situated in the Netherlands. Thermal exergy and thermal energy demands of the building and thermal energy and thermal exergy losses occurring in the HVAC systems are discussed. The building and the HVAC systems to be considered meet standard Dutch energy performance regulations. Nevertheless their overall exergy efficiencies are low in both cases (17.15% and 6.81% subsequently). The exergy analysis also pinpoints that the thermal energy emission and control system and the energy conversion system are the main causes of the exergy inefficiencies in the heating and cooling cases, respectively.     

Adaptive HVAC zone modeling for sustainable buildings

Control of energy flows within a building is critical to achieving optimal performance of heating, ventilation and air-conditioning (HVAC) systems. To design optimal HVAC control strategies, a dynamic model of the HVAC system - particularly the building zones that it services - is essential. As analysis of building energy consumption is facilitated by the accurate prediction of indoor environmental conditions, techniques that dynamically model HVAC zones are crucial, and as such, is an active area of research. This paper focuses on real-time HVAC zone model fitting and prediction techniques based on physical principles, as well as the use of genetic algorithms for optimization. The proposed approach is validated by comparing real-time HVAC zone model fitting and prediction against the corresponding experimental measurements. In addition, comparison with prediction results using an algorithm based on feedback-delayed Kalman filters has demonstrated the superiority of the proposed approach in terms of prediction accuracy.     

城市微气候国际(地区)合作研究的进展与展望

本文介绍了华南理工大学建筑节能研究中心在多项科研项目的支撑下,与海内外学者共同开展的我国湿热地区城市微气候调节、评估与设计方面的研究进展及阶段性成果,阐明了国际(地区)合作在项目执行过程中所起的作用,对湿热地区城市微气候研究做下一步展望。     

燃气采暖热水炉全自动测试系统研发

介绍了燃气采暖热水炉标准的要求,论述了燃气采暖热水炉全自动测试系统的软硬件设计。     

燃具能效标准与节能测试研究

概述了GB20665--2006《家用燃气快速热水器和燃气采暖热水炉能效限定值及能效等级》的编制过程,对主要参数进行解读,介绍了标准的特点、作用。根据实际的燃气快速热水器和燃气采暖热水炉的能效测试统计数据,指出GB20665--2006实施后,燃气快速热水器、燃气采暖热水炉的平均热效率皆有提高,其中快速热水器热效率提高了3．8％,采暖热水炉热效率提高了2．2％。     

青岛热泵辅助太阳能供热系统的性能分析

结合工程实例,对热泵辅助太阳能供热系统的流程进行了分析。对不同朝向、倾角平板集热器的表面太阳辐照度、太阳能热水系统热效率、空气源热泵制热性能系数进行了实测及计算。对于青岛地区,平板集热器宜采取朝南安装、倾角为45°。     

电气节能新技术探讨

通过对民用电气设计中节能新技术的简要介绍,使我们对节能的方法有了更多的了解,以此为基础,深入研究了这些新方法、新思路,从而为我们电气设计的节能创新提供好的路径。