工作参数对垂直管内R124/DMAC鼓泡吸收能力的影响

Effect of Working Parameters on the Bubble Absorption Capacity of R124/DMAC in a Vertical Tube

通过搭建一套垂直管管内鼓泡吸收可视化实验平台,探究工作参数变化对以R124/DMAC为工质的管内鼓泡吸收过程流型变化及吸收高度的影响情况.吸收高度表征鼓泡吸收器的吸收能力,在相同的工作参数下,吸收高度越低表明鼓泡吸收器的吸收能力越强.实验结果表明,吸收高度与气、液体积流率,溶液入口温度、质量分数,喷嘴孔径,吸收压力及冷却效果均有关系.增加液体体积流率、吸收压力与增强冷却效果,降低溶液入口温度、质量分数及喷嘴孔径,均能降低鼓泡吸收高度,提高吸收器的吸收能力.经对实验数据进行多元线性回归处理,给出R124/DMAC鼓泡吸收高度的估算式,误差约为±20%,.

By constructing a set of visualization experimental platform for bubble absorption in the vertical tube,theinfluence of the working parameter changes on flow pattern change and absorption height in absorption process wasexplored for using R124/DMAC as working fluid.The absorption height can represent the absorption capacity of thebubble absorber.Low absorption height means high absorption capacity under the same conditions.Experimentalresults show that the absorption height is related to the refrigerant vapor flow rate,absorption solution flow rate,andits inlet temperature and mass fraction,the nozzle orifice diameter,absorption pressure and cooling effect.By increasingthe solution flow rate and the absorption pressure,enhancing the cooling effect,decreasing the solutioninlet temperature and mass fraction and the nozzle orifice diameter,all bubble absorption heights can be reduced and theabsorption capacity of the absorber can be improved.By performing the multiple linear regression of experimental data,acorrelation equation for estimating the R124/DMAC bubble absorption height was given within±20%, error band.