吸附劑應用於熱交換器上之最適化設計研究

The optimum design of the adsorbent applied on the heat exchanger

翁淩家 ； 朱禹丞 ； 曾鵬樟 ； 王啟川

《冷凍空調與能源科技雜誌》 97期 (2016/02) Pp. 17-26

摘要

本研究建立除溼元件內之熱傳與水分子質傳行為模式，探討週期性高低壓環境變化對吸附劑性能之影響及系統之性能影響，使其達成高效率低耗能壓縮空氣乾燥系統。文獻中指出，高壓環境能提升吸附劑的吸附能力，但高壓脫附卻需要比常壓脫附還要久的時間，因此本研究將進行高壓吸附及常壓脫附的循環。現階段吸附床內的平行通道中的吸附劑多設計成平均分布，但在實際應用上，氣流入口前段的吸附效果通常較好；在應用上為了達到極低露點溫度，吸附過程在吸附劑未達到飽和前就停止，但吸附的水氣多集中在前段，後段吸附劑的使用效果並不如預期。因此本研究將探討吸附劑於熱交換器上的分布安排。

關鍵字

高壓 ； 吸附與脫附 ； 沸石4A

並列摘要

This study focuses on the heat and mass transfer performance of the dehumidification system under periodic change of environmental pressure. Based on some available literatures, high environmental pressure will enhance the performance of absorption dehumidification, but will prolong the time of desorption regeneration. For better performance, we will operate adsorption in high environmental pressure, and desorption in atmospheric environmental pressure. Currently, in most of the dehumidifier, desiccant is designed as uniformly coated in the system. In fact, uniform coated is not a good design. During the adsorption process, most of the adsorbent will be adsorbed around air inlet, which means that desiccant around outlet or in the middle of the system doesn’t contribute well to the system performance. Our motivation is coating desiccant unevenly, in order to increase system performance.

並列關鍵字

high pressure ； adsorption and desorption ； Zeolite 4A