余热回收式热泵干燥装置的设计与分析

为提高热泵干燥装置的节能效率,设计并研制了能够对干燥室排出的高温气体进行余热回收的热泵干燥装置,并对其进行了性能测试。采用可编程控制器对热风的温度、湿度和风速进行调节,并可对干燥室排出的废热进行回收利用。利用该热泵干燥装置对香菇进行的干燥实验表明:该热泵出风口温度可达65℃,干燥室内温度分布均匀;与电加热干燥装置相比,该装置的干燥时间可缩短5~7 h,每度电的处理量提高了2.3倍,并且提高了干燥品质。     

用于液体除湿的椭圆中空纤维膜管束管间传递现象

研究了用于液体除湿的椭圆中空纤维膜管束管间纵向动量与热量传递现象。选择了四边形和三角形排列这两种规则排列管束中的两根纤维管和管间流体为研究对象,建立控制管间纵向流体流动与传热过程的偏微分方程,并采用贴体坐标转换法对控制方程进行有限容积离散与求解,获得了计算单元内的阻力系数和Nusselt数,分析了流道内局部Nusselt数的变化特征以及纤维管排布（三角形和四边形排列）、管径比、椭圆半轴比以及壁面边界条件（等壁温或等热通量边界）的影响。研究结果可为用于液体除湿的椭圆中空纤维膜管束的结构设计和性能评价提供基本理论及数据基础。     

基于EEMD和ICA方法的驾驶室内噪声源时频分析

为有效控制工程机械驾驶室内噪声,利用集合经验模态分解(ensemble empirical mode decomposition, EEMD)后的本征模函数作为稳定独立成分分析(independent component analysis, ICA)算法中的多个虚拟通道,提出了基于EEMD和ICA相结合的驾驶室内噪声盲源分离方法。通过分析仿真信号验证了EEMD-ICA方法研究复杂非平稳信号可行。结合相干分析、时频分析方法研究推土机驾驶室内噪声特性。结果表明,柴油机的1／2阶、1阶转动频率是驾驶室内相关零部件的振动辐射噪声的主要激励来源,柴油机的燃烧噪声也是室内噪声的来源。通过相干分析与时频分析相结合的技术可较准确实现噪声源定位,结合测试对象的相关常识可实现对噪声类型判别、噪声传入途径等复杂的问题进行研究,为进一步实现驾驶室内噪声治理、故障诊断,提供经济实用的分析手段。     

Energy and economic performance analysis of an open cycle solar desiccant dehumidification air-conditioning system for application in Hong Kong

In this article, a transient simulation model and the EnergyPlus were used to study the energy performance and economical feasibility for integrating a solar liquid desiccant dehumidification system with a conventional vapor compression air-conditioning system for the weather condition of Hong Kong. The vapor compression system capacity in the solar assisted air-conditioning system can be reduced to 19 kW from original 28 kW of a conventional air-conditioning system as a case study due to the solar desiccant cooling. The economical performance of the solar desiccant dehumidification system is compared with that of the conventional air-conditioning system. The results show that the energy saving potentials due to incorporation of the solar desiccant dehumidification system in a traditional air-conditioning system is significant for the hot wet weather in Hong Kong due to higher COP resulted from higher supply chilled water temperature from chiller plants. The annual operation energy savings for the hybrid system is 6760 kWh and the payback period of the hybrid system is around 7 years. The study shows that the solar assisted air-conditioning is a viable technology for utilizations in subtropical areas.     

Synthesis and characterization of soluble poly(amide‐imide)s bearing triethylamine sulfonate groups as gas dehumidification membrane material

A series of soluble poly(amide‐imide)s (PAIs) bearing triethylammonium sulfonate groups were synthesized directly using trimellitic anhydride chloride (TMAC) polycondensation with sulfonated diamine such as 2,2′‐benzidinedisulfonic acid (BDSA), 4,4′‐diaminodiphenyl ether‐2,2′‐disulfonic acid (ODADS), and nonsulfonated diamine 4,4‐diaminodiphenyl methane in the presence of triethylamine. The resulting copolymers exhibited high molecular weights (high inherent viscosity), and a combination of desirable properties such as good solubility in dipolar aprotic solvents, film‐forming capability, and good mechanical properties. Wide‐angle X‐ray diffraction revealed that the polymers were amorphous. These copolymers showed high permeability coefficients of water vapor because of the presence of the hydrophilic triethylammonium sulfonate groups. The water vapor permeability coefficients (P_w) and permselectivity coefficients of water vapor to nitrogen and methane [α(H₂O/N₂) and α(H₂O/CH₄)] of the films increased with increasing the amount of the triethylammonium sulfonated groups. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

防水综合处理技术在地下室改造工程中的应用研究

地下室渗漏水和潮湿严重影响其正常使用功能，防水除湿是地下室工程改造中一项复杂的系统工程，应当根据实际情况进行具体分析，采取综合技术进行处理，仅靠堵漏难以取得满意的效果。文章论述的在沿海某地下室改造工程中应用的防水除湿综合技术，能够为类似工程提供参考依据。     

A new approach for anthropometric design applied to a blast cabin

Common anthropometric design methods require extensive experimentation in order to determine the final design. Even with the help of technical supports this procedure is very lengthy since it requires numerous test cycles in order to create a design which meets all requirements. In addition, it is difficult to determine an objective evaluation scale for the comparison of different designs.

The method described in this paper is based on a completely different strategy that permits designing an object analytically by means of a simple algorithm. In ‘free-style’ experiments the body position movements of real persons can be interpreted as most favourable under certain conditions. The measurement of these parameters and subsequent mathematical processing leads directly to the final design without further experimentation. Consequently even complex objects can be designed in a single cycle.

The method was developed for the redesign of a blast cabin. It was possible to design a cabin with fixed dimensions that can be operated without problems by people of almost all heights, either in a standing or a sitting position. It could be shown that most dimensions did not necessarily correspond to body height.     

震后医用氧舱检验的必要性及检验过程

本文对地震后的医用氧舱检验重点进行分析,并且分项进行了介绍。     

合肥正大购物广场中央空调方案设计

中央空调系统对大型商业综合体的使用,工程造价及日后的运行费用至关重要,中央空调方案包括空调冷、热源,空调形式等,以往空调方案的比较都集中在空调冷热源及其经济性,就空调的主要形式,比如是否采用温湿度独立控制等分析较少;对空调运行可靠性分析也较少。就合肥地区一大型商业综合体的中央空调方案,包括空调形式的设计做出分析,并得出最终空调形式与建议。     

低含湿量冰蓄冷系统的核心过程研究

冰蓄冷技术是一种有潜力的节能技术,流态冰是实现冰蓄冷的良好选择。利用低含湿量制取流态冰的冰蓄冷系统可以克服现有流态冰制取方法的缺点。系统通过溶液除湿循环降低水蒸气分压力,水滴在此环境中持续蒸发至过冷状态,之后使用传统过冷水法的解冷器获取流态冰。溶液除湿过程与水滴蒸发过冷过程是系统的两个重要组成部分,经过对两个过程的实验研究,结果验证了新系统的可行性并揭示了进一步优化的方法;同时,实验中得到了冰晶颗粒,这也显示了系统的应用前景。