| 摘要: |
| 干燥剂吸附性能对除湿换热器系统的除湿性能有重要影响。本文通过改进的ASAP2020气体吸附仪和恒温恒湿箱，先后对Na+和K+改性的聚丙烯酸聚合物的水蒸气平衡吸附性能和吸附动力学特性进行了测试研究，并与硅胶相比较。研究结果表明：平衡吸附测试显示Na+改性的聚丙烯酸在整个相对压力区间性能优于硅胶，K+改性的在高相对压力区间(>0.8)逊于硅胶；基于Polanyi吸附势理论对干燥剂吸附特征曲线进行拟合，以用于后续的除湿换热器模拟研究；动态吸附性能表明聚丙烯酸干燥剂的吸附速率均低于硅胶，但Na+改性的聚丙烯酸整个吸附过程的动态吸附量仍多于硅胶；通过模拟除湿换热器除湿性能，ARI summer、ARI humid和上海夏季、这3种典型室外工况下，Na+改性的聚丙烯酸换热器可以从处理空气去除更多的水分，较硅胶换热器提升49%~118%，适用于室外湿度较小的气候工况。 |
| 关键词: 空气调节系统 除湿 吸附剂 吸附 |
| DOI： |
| 投稿时间：2018-11-24 修订日期：2019-05-09
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| 基金项目:空调设备及系统运行节能国家重点实验室开放基金(ACSKL2018KT10)和国家自然科学基金(51806195)资助项目。 |
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| Study on the System Performance of Desiccant Coated Heat Exchangers using Ion Modified Polyacrylic Acid Salt |
| Yu Bo,Zheng Xu |
| (The State Key Laboratory of Air-conditioning Equipment and System Energy Conservation, Gree Electric Appliances, Inc. of Zhuhai;School of Civil Engineering and Architecture, Zhejiang Sci-Tech University) |
| Abstract: |
| Desiccant materials play a key role on the dehumidification performance of desiccant coated heat exchanger (DCHE). The equilibrium water adsorption capacity and adsorption kinetics of Na+ and K+ modified polyacrylic acid salts were tested using an improved gas adsorption analyzer (ASAP 2020) and a constant temperature humidity chamber, with conventional silica gel as reference. Researches on equilibrium adsorption show that, Na+ modified polyacrylic acid salt had a water uptake much higher than that of silica gel, while the K+ modified one was inferior to silica gel at a relative humidity range higher than 0.8. Besides, sorption characteristic curves were fitted based on the Polanyi potential theory and can be used in simulating dehumidification performance. Adsorption kinetics tests displayed that the rate coefficients of both ions modified by polyacrylic acid salts were lower than that of silica gel; however, the dynamic water adsorption quantities of the Na+ modified one during an adsorption process of three hours were still higher than those of silica gel. Finally, the dehumidification performance of the Na+ modified polyacrylic acid salt was evaluated and compared to silica gel using a validated mathematical model of the DCHE system, with water as a refrigerant under three different ambient air conditions, i.e. ARI summer, ARI humid, and Shanghai summer. Simulation results suggested that the modified Na+ could remove 49%–118% more moisture from the process air and possessed greater superiority especially for conditions with lower atmospheric humidity. |
| Key words: air-conditioning system dehumidification adsorbent adsorption |
