空气-水/吸湿溶液热湿传递特性分析(Ⅰ)可及处理区域

An analysis for heat and moisture transfer effect in air-water or-hydroscopic solution(Ⅰ)Reachable handling region

利用模型研究空气与水或吸湿溶液热湿传递过程的特性,得到两个相互独立的驱动力——焓差驱动力和相对湿度差驱动力。根据两驱动力的关系在焓湿图上确定了一个由空气进口等焓线、湿空气饱和线(或溶液等浓度线)、空气与水或溶液进口状态连线围成的三角形区域,不论流型、传热传质系数或流量如何变化,空气出口状态只能在该区域内变化,即为空气与水或吸湿溶液热湿传递过程的可及处理区域。应用可及处理区域分析了文献中除湿实验、再生实验的热湿处理结果,明确了实验装置所处的性能水平。

A model is established to analyze the heat and moisture transfer process in air-water orhydroscopic solution system, two independent driving forces each other： enthalpy difference and relative humidity difference can be obtained. A triangle region, consisting of iso-enthalpy line from air inlet, saturation line of moisture air （iso-concentration line of solution） and connecting line of air and water or solution at inlet status, is determined in enthalpy-psychrometric chart based on relationship between the two driving forces. The region is a reachable handling region for heat and moisture transfer process in airwater or-hydroscopic solution system, because the variation of air outlet status is limited in the region whatever change of mass and heat transfer coefficients or flow pattern and rate. Experimental results of dehumidification and regeneration in literatures are analyzed with the help of reachable handling region.