Abstract:

Desiccant-coated heat exchanger (DCHE) combines the heat exchanger with the solid desiccant, which can significantly improve the dehumidification efficiency of the air conditioning system. The adsorption characteristics of the desiccant have an important influence on the dehumidification performance of the desiccant-coated heat exchanger. In this paper, the curdlan-lithium chloride composite adsorbent was developed and analyzed by the ASAP Mike adsorption instrument and the STA synchronous thermal analyzer. The material components were optimized, and the optimized composite adsorbent was applied to the heat exchanger to verify the efficient deep dehumidification performance of the desiccant-coated heat exchanger. The experimental results show that the curdlan composite adsorbent has the ability of deep dehumidification, even under 30℃ and 30% relative humidity (RH), the saturated adsorption capacity can reach 2.65 g/g and the adsorption rate coefficient k was 2.1×10^-4 s^-1. The MRC of the prepared composite desiccant-coated heat exchanger is 3.78 g/kg. This study achieves the development of a new low-cost and high-performance desiccant-coated heat exchanger with good dehumidification and stable circulation performance, which provides a reference for the technology of deep dehumidification system.

Key words: composite sorbent, desiccant-coated heat exchanger, adsorption, regeneration, heat and moisture performance

摘要：

除湿换热器将换热器与固体干燥剂结合，可显著提高空调系统的除湿效率。干燥剂的吸附特性对除湿换热器的除湿性能有重要影响。研制了可得然-氯化锂复合吸附剂，用ASAP麦克吸附仪及STA同步热分析仪，从等温吸附及动态吸附特性等角度分析了其吸附特性，实现了材料的组分优化，并将优化后的复合吸附剂应用于除湿换热器，验证了该新型除湿换热器高效的深度除湿性能。实验结果表明，可得然复合吸附剂具有深度除湿的能力，即使在30℃、30%RH干燥工况下，其除湿量高达2.65 g/g，吸附速率系数k为 2.1×10^-4 s^-1；所制备复合除湿换热器的MRC可以达到3.78 g/kg。本研究实现了除湿性好、循环性能稳定的低成本高性能新型除湿换热器的开发，为深度除湿系统的技术研发提供参考。

关键词: 复合吸附剂, 除湿换热器, 吸附, 再生, 热湿性能