- 學位論文
新混合溶劑除濕液液態比熱量測：SALT/GLYCOL/H2O系統
Heat capacity of mixed solvent desiccant: SALT/GLYCOL/H2O systems
摘要
摘要 近年來有機水溶液與鹽類系統被考慮作為可能的液體除濕劑吸收劑來吸收空氣的水氣。為了設計合理的除濕程序，需要液體除濕劑的比熱值來估算除濕設備正確的熱負載。本研究利用示差掃描熱量計(Differential Scanning Calorimeter, DSC)量測salt/glycol/H2O的比熱，量測的溫度範圍為30℃至80℃。研究的鹽類為lithium chloride (LiCl)和lithium bromide (LiBr)；二醇類為diethylene glycol (DEG)，triethylene glycol (TEG)，tetraethylene glycol (T4EG)，propylene glycol (PG)與dipropylene glycol (DPG)。三成份系統研究的四個濃度系統為鹽類(4 - 25 mass %)混合二醇類(50 - 80 mass %)。除了三成份系統之外，亦量測二醇類水溶液之比熱值。 實驗所量測之二醇類水溶液之比熱值皆以Redlich-Kister 方程式予以迴歸。實驗中所得到之二成份系統的數據共有175個數據點，其計算後所得之 和CP值的AAD% 分別為1.2% 和0.4%；而三成份系統數據有440個數據點，以Söhnel and Novotñy(1988)修正式來計算，其CP值的平均絕對百分偏差為0.4%。 本研究結果可做為液體除濕劑在除濕程序中，設計除濕液再生器部分所需熱空氣之基礎數據及計算工具。
並列摘要
Abstract The aqueous-organic with salt systems have been recently considered as potential absorbents for liquid desiccants to absorb moisture from air. For rational design of the dehumidifier process, heat capacities of liquid desiccants are required to estimate the correct heating load of dehumidifier equipments. Heat capacities of salt/glycol/H2O systems have been measured in this study over the temperature range 30 to 80 °C with a differential scanning calorimeter. The salts studied are lithium chloride (LiCl) and lithium bromide (LiBr); the glycols considered are diethylene glycol (DEG), triethylene glycol (TEG), tetraethylene glycol (T4EG), propylene glycol (PG) and dipropylene glycol (DPG). For each ternary system, four systems of which (4 - 25 mass %) salt mixed with various glycols (50 - 80 mass %) were studied. In addition to ternary systems, the heat capacities of glycols and aqueous glycol solutions were also measured. A Redlich-Kister-type equation for representing excess molar heat capacity was applied to correlate the measured Cp of aqueous glycol solutions. For a total of 175 data points for aqueous glycol solutions, the overall AAD% of the calculations are 1.2 % and 0.4 % for the excess molar heat capacity and the molar heat capacity, respectively. For the salt/glycol/H2O systems, an equation proposed by Söhnel and Novotñy(1988) was used to represent the measured heat capacity data. For salt/glycol/H2O systems, the overall AAD% of the calculations are 0.4 % for 440 data points. The molar heat capacities of salt/glycol/H2O systems presented in this study are, in general, of sufficient accuracy for most engineering-design calculations for design dehumidifier equipments.
參考文獻
延伸閱讀
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