應用LabVIEW圖控程式進行溫室環控之研究

Abstract

為了改善溫室高溫的問題，瞭解環控設備運作情形，並尋求更合理的運轉設定，本研究以圖控程式建立一個圖形介面的溫室環控系統，配合溫室環控設備進行試驗。圖形介面包括環境狀態顯示面板、控制面板及溫室模型面板。透過資料擷取模組擷取感測訊號及傳輸控制訊號，能將量測之溫度、相對濕度、太陽輻射及設備運轉情形即時顯示在圖形介面上，同時將量測值及控制歷程記錄存檔。本研究主要的控制參考為溫室內之氣溫、相對濕度及室外之太陽輻射，並利用截止區機能分別對通風扇、噴霧及遮光網進行控制。試驗結果顯示，溫室內之溫度能調控在略低於室外溫度1~2 ℃，同時能改善環境狀態變動導致設備反覆開/閉的現象。利用LabVIEW圖控程式所開發的環控系統，具有更好的人機互動特性，同時能讓使用者有更人性化的操作介面。 In order to improve the high temperature problem inside the greenhouse, and to search for a more reasonable method on operational settings of equipments, this research established a graphic interface of greenhouse environmental control system by using LabVIEW software. The graphic interface includes the display panel of the environmental condition, and control panel of the greenhouse. The system can display temperature, relative humidity, solar radiation and the operational states of equipments, and save the history of the measurements and control into a recording file. The system uses data acquisition hardware to grab measurement signals from transducers, and to send the control signals to drive external devices. The major control criteria of this research are the temperature inside the greenhouse, relative humidity and solar radiation of the outside. Also, we processed the control for ventilation, fogging and shading of greenhouse by adopting dead zone function. The result showed the temperature inside the greenhouse was lower than outside temperature in 1~2 ℃,and reduced the frequency in repeatedly ON-OFF operation of the equipment. The program for environmental control of the greenhouse was developed by using LabVIEW software . It has a better human-machine interaction characteristic, and much friendly to user.