近年來對於熱交換器性能的要求愈來愈嚴格,因此希望設計出一高效能的熱交換器,以達到節能的目的。而本研究將藉由改變管路配置,以增加溫度分佈的均勻性,進而提升熱交換器效能。 本研究主要分為兩個部份。第一部份是在相同的分流數下,量測五種不同管路配置的熱交換器,並在工作流體流量不同的情況下,比較實驗量測的結果。經實驗結果發現,管路配置為H Type型式的熱交換器效能最好,相較於效能最差的平行Type,有效度大約可以提升50%。 而第二個部份則探討管路於不同分流下熱交換器之效能。由於管路分流愈多,會提升熱交換器溫度分布之均勻性,但是卻減少熱交換器內流體的熱阻,使得內部的流體單方面主導了熱交換器的性能,遠離了熱交換器較佳的操作點。因此本研究希望理論分析推導,先找出熱交換器最佳化的設計點,並藉由實驗驗證。而本研究所推導出了理論模式與實驗結果相符合。如果能藉由以上的研究成果,對熱交換器進行管路配置,便可以設計出一高效能之熱交換器。 本文之研究內容已申請專利。
In recent years, the performance of heat exchanger is demanded strictly. Therefore, it’s important to design a high efficiency heat exchanger for energy saving. In this research, changing circuit arrangement is the way which will make temperature distribution uniformity to improve the performanceof heat exchanger. There are two section in this research. In the first part, all of arrangements have two circuits. Besides, there are five arrangements tested in different mass flow rate. From the results of experiment, the best arrangement, H Type, is better than the worst arrangement 50 percent in effectiveness. The second section is about the performance of heat exchanger in different circuits. Increaing circuits will let temperature distribution uniformity but the heat resistance of flow which in the heat exchanger will be decreased. It’s not a good operation for heat exchanger. Thus this research will develope the model and proves it by test. In the results, the theory conforms to the experiment. By the consequence, it is able to design a circuit arrangement of heat exchanger which is high efficiency. The patent of this research is applied.