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題 名 | 空氣含濕率與鰭片式熱交換器性能關係之研究=The Relation between Air Moisture Content and Performance of Fin Type Heat Exchangers |
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作 者 | 陳冠宇; 蔡瑞益; 張永鵬; 黃錦文; | 書刊名 | 中原學報 |
卷 期 | 28:3 2000.09[民89.09] |
頁 次 | 頁59-68 |
分類號 | 440.027 |
關鍵詞 | 含濕率; 表面風速; 帶離現象; 熱交換減量比; Air moisture content; Face velocity; Carry over phenomena; Heat duty depression ratio; |
語 文 | 中文(Chinese) |
中文摘要 | 本文係針對空氣含濕率與鰭片式熱交換器性能關係的測試分析,分析結果通過盤管之表面風速介於2.3-2.8 m/s較為適合,太高易造成帶離現象(尤其排數較少時),影響出風含濕率及其熱焓,導致熱交換性能相對地降低;入水溫度及出入水溫差不可太高或太大,否則亦會有此現象,通常取6.5-7.5 ℃左右,太低則會影響冷凍設備之循環效率,出入水溫差以介於4.5-5.5 ℃較為理想。相同之入風乾球溫度不同之入風濕球溫度其熱交換減量比較小,不同之入風乾球溫度相同之入風濕球溫度其熱交換減量比較大,入風含濕率愈高而入水溫度或出入水溫差又太高或太大時其熱交換減量比愈大,也就是說冷凝水液所帶走的熱量不可忽略。至於具除濕作用之盤管,並非多管排或鰭片數即具有較好的除濕效果,宜取6-8排及每吋鰭片數8-10片,同時表面風速亦降至2.1-2.3 m/s為宜。 |
英文摘要 | A study of the relation between the air moisture content and the performance of fin type heat exchangers is proposed. The suitable face velocity of coil is between 2.3-2.8m/s. The high face velocity will cause carry over phenomena (especially for lower number of tube rows), and affect outlet air moisture content and enthalpy, which will be caused heat transfer performance decrease. The inlet water temperature is usually taken at about 6.5-7.5 ℃. If the temperature is taken too low, the coefficient of performance (COP) of cooling equipment will be affected. The ideal temperature difference between the inlet and outlet water temperature is 4.5-5.5 ℃. The heat duty depression ratio of different inlet air dry-bulb temperature, same inlet air wet-bulb temperature is lager, while heat duty depression ratio of same inlet air dry-bulb temperature, different inlet air wet-bulb temperature is smaller. The higher inlet air moisture content, while inlet water temperature or temperature difference is also too high, the larger heat duty depression ratio will be. These mean that the heat taken away by condensing water can not be neglected. To have better dehumidify efficiency, 6-8 tube rows and 8-10 fins per inch is the best choice and face velocity is also decreased to 2.1-2.3m/s at the same time. |
本系統中英文摘要資訊取自各篇刊載內容。