变换工序降低能耗的新途径

比较了半水煤气2种增湿过程的有效能损失及热力学效率，提出了降低变换工序能耗的新途径——完全利用热水增湿、升温半水煤气。     

转轮除湿在水电站的设计应用

阐释了转轮除湿的机理和技术特点,结合水电站设计,对转轮除湿的适用条件和系统设计作了分析说明,并展望了转轮除湿在水电站的应用前景。     

高湿环境双露点送风加湿研究

针对工业领域高温、高湿生产车间传统空调方法存在的问题,提出了双露点送风加湿法。该方式是通过两个喷淋室将空气分别处理到不同的露点状态,均匀送入车间内进行混合来消除室内余热余湿,进而达到维持高湿度生产环境的目的。理论分析及工程实践表明,在冷源条件允许时,采用该方法可降低换气次数,节约运行费用,节能效果显著。     

流体动力式空调喷水室的实验研究

针对目前空调喷水室存在的一些问题，开发了一种流体动力式喷水室。系统地介绍了其雾化机理、结构特点和实验方案。实验结果表明该喷水室具有防堵、高效，节能，便于维护等特点。     

浅谈不同加湿形式的发展过程及其适用场合

空气的加湿处理是空气调节中的重要过程,本文对等温、等焓加湿中几种常见加湿方式的优缺点和发展过程进行对比,并举例介绍在不同场合中几种加湿方式各自的适用性。     

湿膜加湿器的加湿机理及影响因素分析

湿膜加湿器利用等焓加湿方式对空气进行加湿,只消耗风机和循环水泵的电耗,具有结构简单和节省能源的优点。本文从湿膜加湿器的加湿机理出发,研究湿膜加湿器的加湿性能,并分析影响其加湿性能的主要因素,最后简要介绍了湿膜加湿方法的应用,这对改善和提高湿膜加湿器的加湿效率及其推广应用有重要的意义。     

分散性防水材料的原理及应用

本文较为详细地讨论了分散性防水材料的抗水机理在于反毛细压力,井结合其抗水机理,分析了大量实验中和工程应用中所出现的防水失效的原因,指出了湿热蒸汽是该类防水材料的最大克量,从而比较客观地评价了该类防水材料在防水工程中的实际应用。     

撞击型雾化喷嘴流量特性及喷雾降温性能试验研究

针对空冷机组在夏季高温天气不能满发的问题,采用喷雾增湿以降低入口空气的干球温度,选用撞击型雾化喷嘴AM4进行流量特性及喷雾降温特性的实验研究。分析试验数据拟合得到撞击型喷嘴流量与喷雾压力的关系,并计算得出喷嘴的流量系数。通过对不同类型喷嘴组合喷雾降温效果的比较,得到加入1排AM4有利于冷却效果的提高;加入两排AM4的喷雾降温效果并没有明显提高,且由于撞击式喷嘴价格较高,加入两排AM4的经济性较差。     

600MW直接空冷机组加装尖峰冷却装置改造及性能分析

为解决空冷发电厂夏季高背压运行影响汽轮机安全问题,保证机组的出力,直接空冷机组都采用了尖峰冷却装置,以提高直接空冷机组渡夏能力.介绍大唐彬长电厂机组空冷尖峰喷淋装置的改造,并针对夏季高温时段,不同负荷、不同环境温度下,投运尖峰冷却装置后机组真空的变化进行了对比分析;结果表明,机组在600MW、550MW、500MW负荷运行且环境温度26℃～31℃时,机组的背压分别下降4.9kPa、5.1kPa、3.3kPa.机组在550MW～ 600MW运行时,投运尖峰冷却装置效率最高,负荷越低,背压越低时,投运尖峰冷却装置效率越低;最后对机组在满负荷运行情况下所取得的经济效益进行了评估.     

The fitting of various models to water sorption isotherms of tea stored in a chamber under controlled temperature and humidity

The moisture sorption characteristics of tea stored in a chamber regulated by an atomizing humidification system were investigated at 25, 35 and 45 °C for water activity ranging from 0.1 to 0.9. The sorption isotherms of tea were typical type II sigmoidal curves according to BET classification. In both adsorption and desorption, an increase in temperature resulted in lower equilibrium moisture contents at corresponding values of water activity. The sorption isotherms exhibited hysteresis over the whole water activity range. GAB, BET, Henderson, Iglesias and Chirife, Oswin, Peleg, Smith and Caurie models were applied for analysing the experimental data. Nonlinear regression analysis was used for the determination of the parameters in the equations. Estimated parameters and fitting ability for sorption models were evaluated. The Peleg model was found to be the most suitable for describing the relationship between equilibrium moisture content and water activity for the whole range of temperatures and relative humidities studied. The surface area of monolayer was calculated. The BET equation was solved for the monolayer moisture content and the corresponding a_w values at which monolayer forms were presented. Sorption isotherm data were used to determine the thermodynamic functions such as isosteric heat of sorption, sorption entropy, spreading pressure, net integral enthalpy and entropy. The Clausius-Clapeyron equation was used to evaluate the isosteric heats of sorption. The isosteric heats of sorption and sorption entropy decreased with increasing moisture content. The heat of desorption was little higher than that of adsorption at low moisture content. The enthalpy-entropy compensation theory could be successfully applied to water sorption by tea. This theory showed that the moisture sorption of tea was governed by enthalpy-controlled mechanisms. The spreading pressure increased with increase in water activity and decreased with increasing temperature. The net integral enthalpy decreased with moisture content while the net integral entropy increased.