太陽光能量為一種潔淨、且能量充沛的自然資源,可以利用太陽光譜選擇性吸收膜來吸收太陽光,並將其轉換成熱能或電能來利用。目前製備具有高吸收性能之吸收膜的製程設備過於昂貴且製程複雜,因此本研究是利用簡單製程以及低成本的無電鍍複合鍍技術來製備氧化鋁/鈷之太陽能選擇性之吸收膜。 實驗過程是以田口法探討氧化鋁粉末粒徑、氧化鋁粉末含量、鍍浴pH值、施鍍溫度和吸收膜厚度對吸收膜之光學性質的貢獻度比較,再依照貢獻度來設計另一組實驗,並找出最好條件的Al2O3-Co吸收膜來進行黑化和塗佈抗反射層處理以提高對太陽光能的吸收效率,之後將分析各參數設計對吸收膜之吸收率(α)和熱輻射率(ε)的影響。利用紫外光/可見光/近紅外光分光光譜儀(UV-Vis-NIR)測量吸收膜在300nm~2500nm的波長範圍之反射率和傅立葉轉紅外線光譜儀(FTIR)分析吸收膜在2500~15000nm波長範圍之反射率,分析Al2O3-Co吸收膜之吸收率(α)及熱輻射率(ε)。 以無電鍍複合鍍製備的Al2O3-Co吸收膜可得到吸收率0.54,熱輻射率0.05;試片經由黑化使得表面粗糙度提升後可以獲得吸收率0.73,熱輻射率0.39的光學性質;在塗佈抗反射層則可獲得吸收率0.73,熱輻射率0.10的吸收膜之光學性質。
In this study, the electroless composite coating technology has been utilized to deposit the Al2O3-Co composite solar selective surface coatings on Al substrates. The electroless composite coating technology has used to replace the high expenses and complex fabrication methods, due to its lower cost, simple equipment and easy to operate. This work aims at exploring the effects of Al2O3 particle size, Al2O3 contents, pH value, operate temperature and absorber coating thickness on the absorptance (α) and thermal emittance (ε) of Al2O3-Co/Al absorbers. Utilized the Taguchi Method to find contribution, and using the contribution to design the second test. The anti-reflective layer and black treatment were used to improve the optical properties of Al2O3-Co/Al absorbers, and the durability of Al2O3-Co/Al absorber was characterized by the thermal stability and the condensation tests. The α and ε of as-deposited Al2O3-Co coatings is 0.54 and 0.05, respectively. The α increases to 0.73 and ε increases to 0.39 when the Al2O3-Co coatings are underwent the black treatment. The adding of anti-reflective layer increases α to 0.73 and ε to 0.10.