逆向流熱交換器因為其幾何排列的原因，使得其中一邊工作流體的出口溫度會接近另一邊工作流體的入口溫度，因此其擁有最高的熱交換效率。但在熱交換器微型化後，卻很難使冷熱端的工作流體做交錯排列，其原因為當流道尺寸縮小後，不易分別指定冷端流體和熱端流體的位置，因此大部分的研究在將逆向流熱交換器微型化後，都是將冷熱端的流體分別做並排的方式排列。本文嘗試以微流道和脈衝形結構為基礎，並且以兩種平板堆疊來同時達到冷熱流體交錯排列與流動逆向的目的。首先以傳統的微型交錯流熱交換器為基礎，建立解析模型來分析有效度、壓力降及熱傳量間的交互影響，用以了解微型熱交換器的熱傳特性，接下來實際製作銅質微型交錯式逆向流熱交換器，以去離子水作為工作流體，進行性能的量測，最後再以Fluent數值模擬建立不同的熱交換器模型，用來分析比較尺寸及材質對性能的影響，以彌補實驗量測的不足，本研究結果可提供微型熱交換器之設計分析參考。 Due to the geometry arrangement of the counter-flow heat exchanger, the outlet temperature of the working fluid at one side is close to the inlet temperature of the other side. The counter-flow heat exchanger is thus to have the highest heat exchange efficiency. After the miniaturization of the size of the heat exchanger, the working fluids of hot and cold end are difficult to make staggered arrangement. The reason is that when the size of flow channel shrinks, it is difficult to confirm the location of hot-end fluids and cold-end fluids. After miniaturization of the counter-flow heat exchanger, most researches thus design the hot and cold end fluids to be of side-by-side arrangement. This research attempts to use micro channels and pulse waveforms structure as the base, and also to use piling of two different plates to reach the staggered and counter-flow arrangement of hot and cold fluids as the purpose. First, base on the traditional micro cross-flow heat exchanger, we built the analytic model to analyze the interactive effect between effectiveness, pressure drop and heat transfer rate, and to find out the heat transfer characteristics of the micro heat exchanger. And then, we fabricated a copper based micro staggered counter-flow heat exchanger. DI water was used as the working fluid in the experiment. Finally, the characteristics of the heat transfer and pressure drop of different heat exchanger materials, aspect ratio and channel length were analyzed and compared by Fluent numerical software to make up for the insufficiency of the experimental measurement. The work provides a reference for design and analysis of micro heat exchanger.
