紅外線奈米塗料提升R-600a冰箱性能之研究

Abstract

本研究針對紅外線奈米塗料（IWNC）塗佈於異丁烷（R-600a）冰箱的冷凝器進行提升冰箱性能之可行性研究。首先利用複立葉紅外線光譜儀(FTIR)選擇出較高紅外線吸收值的三種紅外線材料，並使用二階合成法製作這三種材料的IWNC。接著經由FTIR、發射率、熱交換實驗的結果來篩選出最佳的紅外線材料與濃度。最後將IWNC塗佈於R-600a冰箱冷凝器上，並探討冷凝器有無塗佈IWNC在不同的環境溫度（26、30、34 ℃）下的無載下拉測試與環境溫度30℃的24小時加載運轉測試的性能係數（COP）、能源因數（EF）、庫內溫度、耗電量等相關參數，藉以評估IWNC對於冰箱性能的影響。 研究結果顯示，IWNC最佳的添加材料為多壁奈米碳管（MWCNTs），最佳濃度為4 wt.%。與未塗佈MWCNTs/IWNC的R-600a冰箱測試數據相比較，冷凝器塗佈4 wt.%的MWCNTs/IWNC之後的高壓壓力可減低5.74%，EF提升7.89%，耗電量下降7.15%，COP則提升6.17%。相關研究結果顯示在R-600a 冰箱的冷凝器上塗佈MWCNTs/IWNC確實可提升冰箱的性能與降低耗電量，對於節能減碳將將能有所助益。In this study, the infrared water-based nano-coating (IWNC) was coated on the condenser of isobutane (R-600a) refrigerator to demonstrate the feasibility for enhancing the performance of the refrigerator. First, the Fourier transform infrared spectroscopy (FTIR) was used to select three infrared materials with high infrared absorbance to be prepared for the IWNC by a two-step synthesis method. Then, the optimal infrared materials and concentration was selected by using the FTIR, emissivity, and heat exchange experiments. Finally, the IWNC was coated on the condenser of R-600a refrigerator for evaluating the coefficient of performance (COP), the energy factor (EF), the freezer temperature, electricity consumption, and other related parameters under the conditions of no load pull-down test at different ambient temperatures (26, 30, and 34 oC) and 24-hour loading test at ambient temperature of 30 oC, respectively, to assess the performance of the refrigerator with and without the IWNC. The results showed that the optimal infrared material and concentration was multi-walled carbon nanotubes (MWCNTs) and 4 wt.%, respectively. The condenser of R-600a refrigerator with 4 wt.% MWCNTs/IWNC reduced the high-pressure and electricity consumption 5.74% and 7.15%, respectively; enhanced COP and EF 6.17% and 7.89%, respectively; as compared with the test data of original R-600a refrigerator. The relevant results displayed that the condenser of an R-600a refrigerator coated by the MWCNTs/IWNC indeed improved performance and reduced electricity consumption of the refrigerator, which is helpful for energy conservation and carbon reduction.