在廚房排煙系統的設計上，目前仍是以懸吊在烹調器具上方之Range Hood型式最為普及。其排除油煙的方法是以其內部之風扇馬達產生足夠的吸引氣流來引導烹調過程中所產生的油煙集中往排油煙機出風口的位置移動。隨著生活品質的提升，在一般中式廚房高油煙污染的環境下，如何以低成本之技術有效維持廚房的空氣品質、並降低排油煙機使用時在環境中所產生的噪音量，有越來越受到重視之趨勢。在本文中，我們提出了一個低成本、高效率的廚房排煙系統設計方法以滿足這樣的需求。此項設計是以我們在油煙感測方法的研究成果為基礎。在所完成的系統中，經濟且靈敏度極高的壓電元件被首次使用在油煙量變化的量測上，並依此設計排煙系統轉速自我調整之控制電路，使系統具有隨油煙濃度變化自動調整轉速之功能，並得以最經濟的運轉方式將油煙完整移除。
根據我們以該系統實地進行烹調實驗的結果發現，以所選擇的壓電元件為基礎所完成的排煙系統，平均噪音的產生量與功率的消耗量均比原來未受控制而全速運轉的排油煙機大幅降低。在本文中，我們以該排煙系統在油煙濃度變化較為分明劇烈、也較為常見的烹調行為-蔬菜的大火快炒中轉速變換的結果，說明該系統在噪音減量與能源節省上的表現。平均而言，在一次完整蔬菜大火快炒的烹調過程中，噪音的產生量為65.66 dB，而功率的消耗量為123.97 W。此二個結果均分別遠小於未受控制前傳統排油煙機全速運轉時所產生之噪音量，72 dB，和功率消耗量，216 W。

In the system design of the kitchen range hood, the exhaust fan is utilized to generate an adequate suction flow to eliminate the cooking contaminants. In the highly greasy environments such as Chinese-style kitchens, how to reduce the range hood noise and its power consumption to acceptable levels in an economical way is most concerned. In this thesis, a low-cost high-efficiency smart range hood system is proposed to control the noise and the power consumption in rational levels. In this system, a sensitive and inexpensive piezoelectric transducer is first adopted as the sensing device of cooking contaminants. Based on the function of the piezoelectric transducer, the proposed system is capable of adapting its suction flow rate automatically to an adequate level according to the amount of cooking contaminants detected by the transducer.
According to experimental results, the noise level and the power consumption can be largely reduced with the help of the transducer and the microcontroller-based range hood system controller. In the typical heavy frying of vegetable common in Chinese-style kitchens, the obtained noise level is 65.66 dB and the power consumption is 123.97 W on average. They are much less than those of the conventional range hood system without control, which are 72 dB and 216 W, respectively.

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