Abstract: Boiling regeneration of liquid desiccant solution can reduce the dependence of desiccant air-conditioning on the outdoor environment.The study on boiling characteristics of solution is significant for the design of boiling regenerators.In this study, the pool nucleate boiling characteristics of three conventional desiccant solutions and one formula desiccant agent were investigated experimentally.For the three desiccant solutions, the boiling temperature increases with the increase of concentration; their heat transfer coefficients are lower than that of water and decrease with as concentration increases, but when the concentration increases to a limit so that small particles precipitate, the heat transfer coefficient increases.For similar mass transfer capacity, the boiling heat transfer performance of lithium bromide solution and calcium chloride solution is superior to that of lithium chloride solution.With the addition of a certain amount of calcium chloride solution, the boiling heat transfer performance of lithium chloride solution can be optimized.

Key words: liquid desiccant solution, pool nucleate boiling, boiling temperature, heat transfer coefficient, surface tension

摘要： 溶液除湿剂的沸腾式再生能够降低除湿空调对室外环境的依赖性,而溶液的沸腾特性的研究对沸腾再生器的设计有重要意义。针对3种常规除湿溶液及一种配方型除湿剂的池内核态沸腾特性展开实验研究。研究发现:3种溶液的沸腾温度均随着浓度的增加而升高;3种溶液的沸腾传热系数均低于水,并随浓度的增加而降低,但是当浓度增大到极限时,溶液中有小颗粒析出,其传热系数却提高。相近传质能力条件下,溴化锂溶液与氯化钙溶液的沸腾换热性能优于氯化锂溶液;在氯化锂溶液中添加一定量的氯化钙溶液能够优化氯化锂溶液的沸腾换热性能。

关键词: 除湿溶液, 池内核态沸腾, 沸腾温度, 传热系数, 表面张力