本論文主要探討兩串聯房間藉由機械設備提供驅動力之抽取置換式通風。對於透過中間孔口連通的兩串聯房間，房間內流體只有單一流動方向，在上游房間具有環境孔口及單一點熱源稱為浮力源房間；在下游房間具有排出孔口且密度層流體藉由機械力抽取排出稱為抽取房間。理論分析從體積通量守恆方程式、浮力通量守恆式出發，配合點升流理論以及各孔口壓差之關係，推導出兩房間內的界面層高度、密度層縮減重力及通過各個孔口的體積流率。模擬實驗使用縮尺壓克力模型以鹽浴法進行，並根據通風驅動力的類型分為自然式通風、串聯機械式通風兩系列。系列一：自然式通風，控制無浮力源房間之排出孔口位於房間頂部及環境孔口的關閉或開啟，進行Exp1-1串聯模型及Exp1-2並聯模型兩組實驗。系列二：串聯機械式通風，控制抽取房間之抽取體積流率Qex為6,12,15,18,24,27,30 cm3/s，進行Exp2-1到Exp2-7七組實驗。實驗結果顯示，兩組自然通風實驗呈現接近之浮力源房間界面層高度，在串聯自然通風型態，兩房間具有相同的體積流率，密度層縮減重力相等，在無浮力源房間界面層高度將隨時間持續下降。在並聯自然通風型態，無浮力源房間界面層高度低於中間孔口高度，使得環境層受到來自中間孔口的流動捲增，排出體積流率進一步增加，無浮力源房間密度層縮減重力將小於浮力源房間密度層縮減重力，並具有穩定的界面層高度。在串聯機械通風型態，增加抽取體積流率將使兩房間之密度層縮減重力同時下降，浮力源房間之界面層高度抬升，並在抽取房間結果觀察到當抽取體積流率大於臨界體積流率時，流動模式發生轉換，抽取房間之界面將達到穩定。

The mechanical extraction ventilation in two series-connected rooms is investigated in this study. The flow in two series-connected rooms with an internal opening has only a single flow path. The upstream room, which is denoted as the forced room, has a point source of heat and two openings, which connect to the exterior and the downstream room. The downstream room, which is denoted as the extraction room, has a drain opening and the dense fluid is drained out by a mechanical device. The theoretical analysis is based on the conservation of volume flux, the conservation of buoyancy flux, the plume theory and the pressure drop at each opening. Then the dependent parameters in two series-connected rooms including the interface level, the reduced gravity of the dense layer and the volume flow rate are derived. The analogous laboratory experiments were conducted by using the salt-bath method in a reduced-scale acrylic model, and the plume source location was set at the original level. These experiments were categorized into two sets according to the driven force. Set 1, natural ventilation in two rooms, has two experiments. Exp1-1, the series-connected experiment, and Exp1-2, the parallel-connected experiment. Set 2, mechanical extraction ventilation in two series-connected rooms, has seven experiments, Exp2-1 to Exp2-7,with different extraction flow rates, Qex = 6, 12, 15, 18, 24, 27 and 30 cm3/s. The experimental results show that the interface levels in the forced room of two natural ventilation are similar. In the series-connected natural ventilation model, two rooms have the same volume flow rate through them, but the interface level in the unforced room decreases with the time. In the parallel-connected natural ventilation model, there are two different regimes, the small and large flow rate regimes, and the interface level of the unforced room maintains stable. In the series-connected mechanical ventilation model, the interface level of the forced room increases with the higher extraction flow rate. The extraction room interface level results show that the flow pattern may change when the extraction flow rate reaches a certain critical magnitude.

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