本研究主要目的為設計一新型式的蒸發/冷凝熱交換器，以供未來固體吸附式製冷系統使用；並在熱交換器的鰭片上做微溝槽結構產生表面張力來達到熱傳增強之效果。本實驗係測試兩種不同熱交換器，分別為平板鰭片與微溝槽鰭片熱交換器來作比較，實驗結果發現有微溝槽結構之熱交換器能達到較好的凝結熱傳性能，並證實了表面張力在凝結時之熱傳增強的效果。 此外，由於固體吸附式製冷系統運作時處於低壓的狀態，故本實驗亦研究在不同飽和溫(壓)下時，其凝結熱傳係數所受之影響，發現熱傳係數會隨著凝結飽和溫的下降而降低。 The main purpose of this research is to design a new kind of evaporator/condenser heat exchanger, which is applied to an integrated, one-bed, closed-type adsorption air conditioning system. The micro-fin were manufactured on this heat exchanger to bring the surface tension in order to heat transfer enhanced. This research will test two kinds of different heat exchangers, one is with micro-fins and another is plain-fins. In compare of the experiment results of these two heat exchangers, we found that evaporator/condenser heat exchanger with micro-fin have higher heat transfer performance. This result proved that the surface tension can increase heat transfer. Besides, this research also experimented on different condense temperature. We found that with the decrease in condense temperature, the heat transfer coefficient would also decrease.
