為防止勞工暴露有害物，工程控制一直被視為應優先採取之措施，其中又以局部排氣裝置最廣為業界所使用，唯目前事業單位之設置現況、有效性及能耗情形，則仍需進一步分析探討。本研究首先針對局部排氣裝置建立一評估規範準則，並藉此再針對不同事業單位進行局部排氣裝置設置現況進行分析。最後，再就其局部排氣裝置效能與能耗情形加以探討。所建立之規範準則，主要參考六種國外局部排氣裝置設置規範，其內容分為設計及安裝、驗收，及操作維護等三階段，再經專家座談確認可行性後，另分別訂定11、4和4大項，及17、9和7項細部評估內容，及個細項之評估基準。前述準則經對20家事業單位，（含某高科技工業園區之十家高科技產業，和某傳統工業區之十家傳統產業進行現場評估）。測試後，可發現有關設計及安裝階段規範準則項目之17細項中，其各單一細項有50%以上之事業單位符合要求者，傳統產業與高科技產業分別有4項與12項。驗收階段規範基準項目之9細項中，傳統產業與高科技產業分別有0項與8項。操作維護階段規範基準之7細項中，傳統產業與高科技產業分別有0項與5項。本研究另利用靜壓平衡法，針對所訪視十家高科技產業、與十家傳統產業之局部排氣性能與能量耗損情形加以分析。結果發現高科技廠之局部排氣裝置均可達其所需求捕集風速，唯其耗能狀態為理想設計狀態之3.73 ~ 4.30倍。傳統產業部分，可發現有60%工廠局部排氣裝置效能不足，但因其管路設計及排風機選擇不當，100%事業單位均呈現過度耗能情形，其能耗狀態為理想設計狀態之8.33 ~ 150倍。綜合上述，為使事業單位設置之局部排氣裝置能達有效性、及降低能耗之情形，事業單位可利用本研究所發展規範準則，就設計及安裝、驗收、與操作維護三階段分別管制之。

Engineering control is a prior measure to prevent worker expose to hazardous substances. Among them the local exhaust ventilation system (LEV) is the one used widely by industries. But the current installation conditions, energy consumption, and effectiveness of local exhaust ventilation systems are needed for further analyzing. The objective of this study is establish an evaluating protocol for LEV, and used it to analyze current installation conditions of LEV in various industries. Besides, this study is aimed at discussing the energy consumption and effectiveness of LEV. After analyzing all collected reference information, the development of techniques and systems was mainly based on six currently available reference materials. The developed evaluating protocol can be divided into three stages, including design and installation, test, and operation and maintenance stages. For each of the designated stage, its content can be divided into three levels, including main items (11, 4, and 4, for the design and installation, test, and operation and maintenance stages respectively), sub-items (17, 9 and 7, respectively), and detailed guidelines for each of all sub-items (17, 9, and 7, respectively). The present study also assess 20 enterprises, including 10 high-tech industries in a technology park and 10 conventional industries in industrial park, by using the above developed protocol the results show that over 50% enterprises conforming each one of 17 detail contents of detailed guidelines in the design and installation stage are 4 and 12 for conventional industries and high-tech industries, respectively. There are 0 contents in conventional industries and 8 contents in high-tech industries for the 9 detail guidelines in the test stage. There are 0 contents in conventional industries and 5 contents in high-tech industries for 7 detail guidelines in operation and maintenance stage. This study analyzes the energy consumption and performance of LEV by the static pressure balance method. The results show that LEVs in high-tech industries are found with enough capture velocities, but the energy consumption ratio of the current state to the ideal state is 3.73- 4.30. There are 60% LEVs in conventional industries are found with insufficient performance. Because of the poor design in duct and unsuitable fan selection, all selected of enterprises are found with energy consumption ratios 8.33- 150. In conclusion, the enterprises can use the developed evaluating protocol to restrain the LEV in design and installation, test, and operation and maintenance stage for the propose of effectiveness of a LEV system and reducing the energy consumption.

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