以奈米鋅抑菌膜改善空調系統內生物性污染之研究

Study on the Improvement of Microbial Pollution in Air-Conditioning Systems via Nano-Zinic Coating

近年來，我國對於室內空氣品質的的議題已逐漸受到重視。然而，除了確保足夠的通風量之外，空調系統內的清潔也是相當重要的課題，許多研究亦指出空調系統內因高濕度環境所造成的真菌與細菌孳生，可能造成室內的生物性污染。許多研究指出藉由空調箱內與風管的清潔，或是風管表面鍍膜的方法，對空調系統內生物性污染源具有一定的改善效果。 本研究以一間大型教室為對象，分別採用衝擊式空氣採樣法及表面菌濃度採樣法，量測空氣中的菌落數與表面附著的細菌與真菌數，藉以探討採用奈米鋅抗菌膜改善室內生物性氣膠之效能。本研究提出採用維護係數作為風管內清淨度的評估指標，而研究結果發現風管系統經清潔後8週，採用奈米鋅抑菌劑鍍膜的風管表面對細菌類之維護係數仍可維持在95%~98%，而未進行鍍膜的風管表面對細菌與真菌的維護係數已降至54~64%。顯示風管採用奈米鋅抗菌膜可減少清潔的頻率。

 

Recently, Taiwan government has been paying more attention to indoor air quality. Because of the hot and humid climate in Taiwan, large quantities of condensed water are produced in the chilling coils of air-conditioning systems, which could cause significant microbial pollution if an appropriate design and maintenance are not provided. Routine duct cleaning has been suggested as an effective strategy for indoor air quality, and some studies have proposed that applying a coating film to the duct surface can improve microbial pollution conditions. A conference room with an air handling unit was selected for field study in this study. An anti-microbial coating made with nano-zinc was applied to the duct surface after cleaning. Both air sampling and surface sampling were carried out, and the concentrations of bacteria and fungi were calculated using the national environmental analysis laboratory’s method. After 8 weeks of field sampling, the bacterial maintenance factor of the duct surface with anti-microbial coating was maintained at 95%~98%, while the maintenance factor of the duct surface without coating fell to 54%~64%. The results reveal that coating the duct surface with an anti-microbial substance could reduce the frequency of duct cleanliness.