採微通道熱交換器之氣冷式冰水機運轉性能分析

氣冷式冰水機的散熱對於機台構造來說相當重要，目前有許多熱帶型國家在使用氣冷式冰水機時，往往會遇到因為環境溫度高或是在通風不好的環境造成氣冷式冰水機的散熱不良，使得機台停機而無法運轉，如此往往氣冷式冰水水不太適合在熱帶型國家被使用。所以，改採用水冷式冰水機。但是水冷式冰水機往往會很重視水質，在水質不好的的地區；例如:鈣質偏高、PH質太鹼或太酸等因素都會影響水冷式冰水機的效能。因此在水質不好的地區還是必須使用氣冷式冰水機比較理想。經由實驗驗證得知，當氣冷式冰水機採用微通道熱交換器時，在功耗方面可以提升壓縮機的COP值6%；在冷卻系統方面可以使用較少的冷媒量然後大幅提升冷凝器能力。

關鍵字

氣冷式冰水機；水質；散熱；微通道熱交換器

並列摘要

This study is to improve the heat dissipation efficiency of air-cooled chillers. The cooling efficiency of air-cooled chillers is very important for the performance of the chillers. Many tropical countries often use air-cooled chillers because of the high ambient temperature or poor ventilation. The air-cooled chiller has less heat dissipation efficiency, which makes the machine not to operate with high performance, so water-cooled chiller is gradually adapted, but water quality is a great concern for the water-cooled chillers. In areas with poor water quality, the performance of water-cooled chillers will be affected. Therefore, it is better to use an air-cooled chiller in areas with poor water quality. From experiment results, performance of the air-cooled chiller with micro-channel heat exchanger and less charging refrigerant can be enhanced by 6%.