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。     

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。     

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.     

低温干燥冷藏调湿多功能储粮系统及特性分析

干燥是粮食行业的主要耗能环节,目前粮食干燥多采用烘干机或烘干塔,热损失大、能耗高,有些以煤炭作为热源,环境污染严重。另外,粮食长期储藏过程中易发生霉变和虫害,同时长期储藏会导致粮食水分过低影响粮食加工品质。实现粮食高品质、低能耗干燥及长期安全储藏和保证出库粮食的品质具有重大意义,因此提出了一种低温干燥冷藏调湿多功能储粮系统,并基于该系统开发了具有低温干燥模式、低温冷藏模式和加湿调质模式的设备,可实现“一站式”储粮,使储粮全程自动化控制。通过实验测试,结果表明,三种工作模式下,机组出风参数均满足设计要求。对玉米和萝卜进行了初步干燥实验,玉米的平均干燥速度约1.1%/h、萝卜干燥平均干燥速度2.9%/h左右。通过对系统进行能耗分析可知,本机组与烘干机相比可节能19.4%左右,与冷凝去湿干燥机相比可节能51.7%左右。该设备的驱动能源为电能,环境友好,便于实现粮库的智能化建设,市场应用前景广阔。     

地板辐射供冷的控制方法

地板辐射供暖和供冷系统的舒适性和节能效果,已经得到人们的认同。采用精确的控制方法来保证室内的温度、地板表面温度并防止地板表面结露是非常重要的。本文根据操纵变量将地板辐射控制系统分为四类,即供水温度控制、供水流量控制、供水温度与流量同时控制和热流量控制,系统阐述了各种控制方法并介绍了两种带除湿的地板辐射供冷控制逻辑。最后介绍了一种地板辐射供冷与置换通风相结合的控制实例。     

建于购物中心的娱乐性滑冰场空调系统设计要点

介绍建于购物中心的娱乐性滑冰场室内环境主要设计参数的选取原则和建议数值,探讨空调系统的形式及其对建筑装修专业的要求,指出滑冰场空调系统的设计中湿度的控制尤其重要。     

转轮除湿与冷却除湿相结合的复合式除湿工艺空调系统

介绍一种转轮除湿与冷却除湿相结合的复合式除湿工艺空调系统。分析比较氯化钙、乙二醇冷冻水载冷剂在同一温度之间及同一载冷剂在不同温度下的换热系数差异，分析该工艺空调系统不能正常运行的原因，并提出改进措施。