中文摘要：

内热型再生器作为一种高效溶液再生装置其性能主要由溶液加热形式、热水流向、传热单元数及溶液空气相对流向等决定。该文基于装置内溶液、空气、热水三者间的能量和质量守恒,分别建立预热、内热再生器在2种热水流向下的顺流、逆流、叉流的数学模型,并进行理论性能模拟和比较。数值模拟发现大部分工况下内热型再生器再生性能为预热型的2~4倍,且受溶液–空气流量比和热水–空气流量比影响较大。热水与溶液流向相反时的再生性能要优于相同时,最大可高于5%。再生性能随溶液–空气传热单元数和溶液–热水传热单元数的增大而提高,且存在性能增长最快的组合曲线。另外再生过程中大部分情况下溶液和空气呈顺流时的出入口浓度差最大,叉流为其0.97倍左右,逆流最低时仅达到其0.87倍左右。该文研究结果为内热型溶液再生器设计优化提供理论依据。

英文摘要：

Liquid desiccant cooling system, as a good alternative to traditional electric refrigeration air conditioner, is environmentally friendly and can be driven by low-grade energy while it can improve indoor air quality and has high energy storage capacity. The regeneration technique, a key technique in the liquid desiccant cooling system, must be developed before it is widely applied in variety of buildings. The present methods of solution regeneration have electrodialysis, membrane energy exchanger, ultrasonic atomization regeneration, packing tower, and so on. The first three have complicated structures and high costs for their application on a large scale. The packing tower regenerator because of its simple structure and being driven possibly by low-grade energy has attracted many attentions across the world. In packing tower regenerators, the internally-heated liquid desiccant regenerator is a kind of high-efficient solution regeneration device. To improve the reliability and economy of internally-heated regeneration technique, the mathematical models of pre-heated and internally-heated regeneration are established based on the energy and mass conservation between solution and air as well as the energy conservation between heated water and solution in this paper, which include parallel flow, counter flow and cross flow with 2 kinds of different flow directions of heated water respectively, and their theoretical performances are numerically simulated and compared with each other. As for the regeneration performances affected by the ways of heating solution and flow directions of heated water, the simulation results show that regeneration performances of internally-heated type are about 2-4 times that of pre-heated type in most conditions, which means the internally-heated regenerator has a better performance. And the regeneration performances are greatly influenced by the flow-rate ratios of solution to air and heated water to air. With the decrease in flow-rate ratio of solution to air and the increase in flow-r