Exergoeconomic performances of the desiccant-evaporative air-conditioning system at different regeneration and reference temperatures

This paper presented the exergoeconomic evaluation of the developed desiccant-evaporative air-conditioning system. The developed system was evaluated based on the steady-state conditions at different regeneration and reference temperatures. The exergoeconomic evaluation method was implemented to the system components and the whole system to evaluate the exergy efficiency, exergy destruction ratios, cost rates, relative cost differences and exergoeconomic factors. The regeneration and reference temperatures affected the exergy efficiencies, exergy destruction ratios, cost rates, relative cost differences and exergoeconomic factors. The desiccant wheel, heating coil and evaporative cooler had a high cost rate (investment cost, operation and maintenance cost, and exergy destruction cost). The exit air fan, outdoor air fan and evaporative cooler had a high relative cost difference. The exit air fan, outdoor air fan and secondary heat exchanger had a high exergoeconomic factor. Replacement of the desiccant wheel with a higher dehumidification performance could decrease the high cost rate. A higher efficiency evaporative cooler and heating coil were needed. Cheaper air fans (outdoor air fans and exit air fans) were needed.     

Thermodynamic Analysis of Various Dehumidifying Dryers for Wood

Typical methods of dehumidification of air circulating in the dehumidifying driers (indirect and direct cooler and partial exchange of the air) were analysed. Energy aspect of cooler operation was evaluated. The method for minimization of unit thermal energy consumption in a dehumidifying drier by the optimal selection of the cooler point was also given. Methods of the heat recovery of heat conveyed in a cooler lending to save energy (heat regeneration. expansion and compression of the air, a dehumidifier) were analysed. It was indicated that introduction of dehumidifiers into contemporary wood driers caused significant improvement of energy aspects of their operation     

透湿膜的透湿机理与膜的研究概况

基于透湿膜的空气除湿是一种比较新颖的空气除湿方法。本文介绍了各种膜在空气除湿领域的应用情况，结合对膜制备工艺的简要介绍，侧重对原除湿原理，亲水性的高分子纤维素膜，凝胶膜和分子筛无机膜在空气除湿领域的研究和进展进行了分析。     

风机盘管在空调工程中的应用及分析

根据风机盘管的特性，分析了设备运行状况和能量调节方法等方面的有关问题，指出了风机盘管采用变风量的方法调节能量所存在的弊端，同时还分析了在空调设计中，如何充分运用这些特点来合理选型，并对产品开发方面提出了建议。     

明胶和胶囊生产干燥新工艺的研究

本文介绍了氯化锂液体除湿的工作原 理,并深入分析了其除湿工艺、主要特点和在 明胶与胶囊干燥方面的研究和应用。     

溶液除湿系统空气状态影响因素

研究典型叉流式溶液除湿系统中,溶液循环流量（G_cir）、冷/热量（Q_c/Q_h）和系统流程对除湿/再生空气状态变化和除湿效果的影响机制。分析不同工况下空气在焓湿图中的过程曲线特征,比较各因素影响程度。结果表明,在设计条件下,当G_cir约为0.05 kg/s时,溶液除湿系统达到最佳除湿效果;当Q_c、Q_h比例接近,总量由29.4 kW增加至48.9 kW时,系统中除湿量由3.7 g/kg上升至5.7 g/kg;不同流程中,当冷却对象为溶液时,溶液除湿效果较好。相较于溶液除湿系统中G_cir和Q_c/Q_h,溶液除湿流程对空气状态变化和除湿效果的影响程度较大。空气过程曲线在各流程下具有显著特征,溶液除湿流程是影响空气状态变化和除湿效果的核心因素。     

基于PLC的高炉鼓风除湿监控系统

高炉鼓风所含水份在热风炉加热过程中消耗热量,而且在冶炼过程中与焦碳发生吸热反应,如果能够有效地将高炉鼓风中含水量降低,能减少热量的损耗,提高高炉生铁产量.详细介绍了基于西门子S7-300 PLC的高炉鼓风除湿监控系统设计.针对高炉除湿系统的控制要求,重点阐述了系统的硬件和软件设计过程.该系统的运行,降低了能耗成本,产生...     

双级液体去湿冷却空调性能分析

本文介绍了双级液体去湿冷却空调系统的工作原理,分析了系统的吸湿和再生性能、热损失及火用效率.较单级系统而言,双级空调系统具有良好的整体性能与节能效益,在使用低温热源上有较大优势.     

南方湿热地区单级与双级固体除湿系统性能对比

蒸发冷却与固体除湿耦合的空调形式是拓展蒸发冷却技术在南方湿热地区数据中心应用范围和时长的可行性方法之一.本文设计搭建了装填硅胶颗粒的单、双级固体除湿装置,在南方湿热地区城市广州的过渡季条件下进行了实验测试,并建立了理论计算模型,结果表明:在温度为25.2℃和平均相对湿度为56.4％～74.9％范围下,固体除湿装置具有较...     

分离式热管蓄冷空调释冷性能实验研究

本文设计了基于分离式热管换热的蓄冷空调系统,针对其释冷性能进行了因素实验和响应曲面实验研究。结果表明:分离式热管蓄冷空调释冷性能稳定,实验条件下最大制冷量可达5. 09 k W;制冷量随循环风量的增加而增加,而除湿量存在最佳除湿循环风量,最佳除湿循环风量约为620 m3/h,除湿量约为4. 32 kg/h;制冷量随环境温湿度的升高而增加;得到了不同工况下制冷量的回归方程,分析了不同影响因子对制冷量的影响规律,在循环风量较低的工况下,热管阀门对制冷量影响较弱,随着循环风量的增加,对制冷量影响增加。