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題名 | A Linear Control Model Describing the Dynamics of Carbon Dioxide Concentrations in a Ventilated Greenhouse=描述通風溫室中二氧化碳濃度動態之線性控制模式 |
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作者 | 廖中明; 王鼎盛; 劉佳明; | 書刊名 | 農業工程學報 |
卷期 | 37:1 1991.03[民80.03] |
頁次 | 頁68-81 |
分類號 | 435.16 |
關鍵詞 | 二氧化碳; 通風; 溫室; 線性控制; 濃度; |
語文 | 英文(English) |
中文摘要 | 由團塊參數近似法觀點所推導出之線性控制模式可描述通風溫室中任一點二氧化碳濃度之動態行為。系統方程式可以第一階非時變之向量一矩陣微分方程式表示。計畫中並設計一環境氣候箱實驗以評估團塊參數模式預測通風空間中二氧化碳濃度的準確性。二氧化碳濃度的特性是藉量測環境氣候箱中在一廣泛範圍通風率下之平衡濃度。二氧化碳濃度暫態反應之評估則是觀測以通風量為函數之三點濃度變化為主。模式的數值解是以三度空間團塊形式之控制體積其氣流率之守恆關係而得。模式鑑定結果顯示量測二氧化碳濃度值與團塊參數模式所得之預測值相吻合(偏差值為8%)。在低通風率狀況下,量測值與預測值之差異則較大(偏差值為13~14%)。 |
英文摘要 | A linear control model for describing the dynamic behavior of carbon dioxide concentration at any location within ventilated greenhouse is presented from the standpoint of a lumped-parameter approximation. The system equation can be represented by a first-order time-invariant vector-matrix differential equation. To assess the accuracy of a lumped-parameter model used in predicting carbon dioxide concentrations in a ventilated airspace, a laboratory project is presented. The carbon dioxide concentration was characterized in an environmental chamber by measuring its equilibrium concentrations over a range of ventilation rates. The transient behavior response of carbon dioxide concentrations was evaluated at three points and monitored as a function of ventilation rate. The model calculation solved as a three-dimensional lumped from of control volumes representing conservation of air-flow rate. Good agreement was obtained between measured carbon dioxide concentrations and those predicted by the lumped-parameters models (deviation was 8%), however at low ventilation rates, some disagreement between predicted and measured results occurred (deviations were 13-14%). |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。