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Optimized Conditions and High Performing Method of Enhancement of Absorption by Using a Downward Facine Plate

下向Facine板增强吸收的优化条件和高性能方法

基本信息

批准号：
13650216
负责人：
HIMENO Nobuhiro
金额：
$ 2.24万
依托单位：
Shinshu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650216/
关键词：
Enhancement of Absorption Downward Facing Plate Steam Absorption LiBr Aqueous Solution Absorption Heat Pump

项目摘要

The effects of absorbing plate length, concentration of LiBr aqueous solution, and configuration of an absorbing plate have been experimentally investigated on the enhancement of steam absorption into a LiBr aqueous solution by using a downward facing plate, which method the head investigator developed previously, to clarify the optimum conditions and high performing method of the enhancement of absorption. The experiment has been conducted using a finned absorbing plate with fins 1 mm high and 1 mm wide. The groove width varies as 1 mm, 2 mm, 3 mm, 5 mm, 7 mm and 10 mm. The plate width is 50 mm, and the length varies as 50 mm, 180 mm and 250 mm.1. The Effects of Absorbing Plate LengthThe enhancement of absorption by using a downward facing plate grows greater as the absorption plate becomes long. This is because the absorbed water film becomes thick to deteriorate absorption with increasing absorbing plate length, when the enhancement mechanism of absorption does not work.2. The Effects of Concentration of LiBr Aqueous SolutionThe degree of enhancement of absorption by using a downward facing plate does not differ greatly between 30wt% and 60wt% LiBr solutions. When the concentration of LiBr solution increases, growing density difference between the solution and water counterworks with increasing viscosity for the generation of free convection in the liquid film.3. The Effects of Configuration of an Absorbing PlateThe finned plate having 5 mm groove width shows the greatest enhancement of absorption in the present experiment. Narrow width of the groove makes viscosity effects at the side surface of the fin serious in the whole liquid film, while wide width of that causes non-uniform thickness of the liquid film to deteriorate the generation of free convection at the center of the groove.

通过实验研究了吸收板长度、溴化锂水溶液浓度和吸收板结构对溴化锂水溶液水蒸气吸收的影响，确定了最佳吸收条件和高效吸收方法。实验采用高1 mm、宽1 mm的翅片吸波板。槽宽分别为1 mm、2 mm、3 mm、5 mm、7 mm和10 mm。板宽为50 mm，长度分别为50 mm、180 mm和250 mm。吸收板的作用随着吸收板变长，使用向下的吸收板对吸收的增强作用越大。这是因为在吸收强化机理不起作用的情况下，随着吸收板长的增加，吸收水膜变厚，吸收性能变差。溴化锂水溶液浓度的影响在30wt%和60wt%的溴化锂溶液中，使用朝下的板增强吸收的程度没有太大差别。随着溴化锂溶液浓度的增加，溶液与水之间不断增大的密度差与粘度的增加相反，有利于液膜中自由对流的产生。吸收板结构的影响在本实验中，槽宽为5 mm的翅片板对吸收的增强作用最大。窄槽宽使整个液膜内翅片侧面的粘性效应严重，而宽窄槽宽使液膜厚度不均匀，加剧了槽中心自由对流的产生。