計算內冷卻／內加熱式溶液除濕系統性能之數值模型

我國環境高溫高濕，因此空調除濕技術對於住商環境之空氣品質控制具有其必要性。在現有技術中，利用液態之除濕劑的溶液除濕與傳統方法相比有能耗較低、具除菌能力等優勢，因此近年來逐漸受到矚目。運用此技術之系統常將除濕劑冷卻降溫後再與空氣接觸進行吸水除濕，或是將其加熱後再與外氣接觸進行脫水再生。然而吸水為放熱過程會使除濕劑溫度升高導致除濕能力降低，脫水則會吸熱使除濕劑溫度降低不利再生。因此可在除濕時持續冷卻除濕劑或於再生時持續加熱除濕劑之內冷卻／內加熱式系統配置也受到一定之研究關注。為有效率地設計採用此類配置之除濕系統可以數學模型預測於不同元件設計及工作條件下之除濕表現，然而現有模型普遍需要較複雜之計算。因此本文提出一簡化之模型結合熱值傳理論及溶液除濕相關之經驗參數以描述一構造單純之內冷卻／內加熱式配置，可以較簡單之計算過程得出其除濕表現。

關鍵字

溶液除濕；內冷卻；內加熱；數值模型

並列摘要

The climate in Taiwan is hot and wet, therefore the air-conditioning by dehumidification technology plays a crucial role in the control of indoor air quality. Among existing technologies, liquid desiccant dehumidification has the advantages of lower energy consumption and the ability to remove bacteria compared to the conventional technology, and has gained attention in recent years. A system using this technology usually cools the liquid desiccant before putting it into contact with air to absorb its moisture, and heats the desiccant before regenerating its dehumidification capacity by letting its water content evaporate into air in contact. However this would lead to the temperature rise of desiccant and thus reduction of its dehumidification ability during moisture absorption. Similar downside exists for regeneration. Therefore, a system style in which desiccant is internally cooled/heated has drawn attention from researchers. To effectively optimize the design of such system, a mathematical model predicting its performance from its design parameters and working conditions is desirable. However most existing models require complicated computation, therefore in this paper a less complex model describing a simple system is introduced. It uses theories and empirical correlations about the combined heat and mass transfer between air and desiccant, and requires less effort to derive the system performance.

並列關鍵字

liquid desiccant dehumidification ； internally cooled ； internally heated ； numerical model

國際替代計量

計算內冷卻／內加熱式溶液除濕系統性能之數值模型

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