風機乾盤管機組(FDCU)表面結露防制機制之實驗研究

An Experimental Study on the Preventive Schemes for Surface Condensation of Fan Dry Coil Unit (FDCU) System

柯宜松(Yi-Sung Ke 柯宜松)

指導教授 ： 胡石政

國立臺北科技大學/機電學院/能源與冷凍空調工程系碩士班/碩士(2012年)

https://doi.org/10.6841/NTUT.2012.00518

摘要

既有的FDCU (Fan Dry Coil Unit) 的盤管水平擺放方式，且冰水管路通過潔淨室上方，若發生凝結水或破管噴水，則可能進入潔淨室中，對既有FDCU 的結構和冰水配管系統進行改善及驗證是本研究之主題。
故此次研究改善方向有下列幾項 : 其一是將原有FDCU 之盤管部份改為V 型結構，使凝結水自然滑落到水盤。其二是利用結露偵測器及漏水偵測器去驅動流量控制器，將訊號傳送至控制閥將冰水短循環，觀察盤管表面的結露情況。其三是將冰水管路由加壓供水方式改成抽水方式。其四是在正壓供水方式下，增設膨脹水箱改成微負壓供水模式，並在盤管末端焊接處裝設小水閥，用來模擬破管開口的大小，用實驗觀察上述兩項供水模式下，若不慎發生破管漏水時，模擬破管
的漏水情況及噴水強弱，避免因大量噴水造成潔淨室及設備的重大損失。並使用數台小型攝影機將結果紀錄於電腦中。
研究結果顯示，將盤管部份改為V 型結構，凝結水能順利滑落到水盤。透過結露偵測器能有效防止盤管表面結露滴水，及使用微負壓供水方式下，針對潔淨室水損的問題均得到更佳的控制及改善。

關鍵字

FDCU(V-tipe)

並列摘要

As horizontal positioning at ceiling level of current Fan Dry Coil Unit (FDCU) installation, condensation and leakage of chill water may cause and, thereafter, resulting
a casualty. Therefore, the objective of this study is to investigate and evaluate the performance of several preventative schemes for condensation and chill water eruption of the FDCU system.
Specifically, this study focuses on the following four preventative schemes. First,the original horizontal dry coils were modified to be V shape so as to contain the
possible condensed water or leakage chill water. Second, the condensation detector and leaked water detector were installed. Experimental tests were performed to evaluate the
reacting effectiveness of any condensation and leakage of chilled water. Third, the original positive-pressure of supply water system was changed to a negative one. Fourth,
an expansion tank was installed so as to maintain a negative-pressure. A tiny water valve was installed on welding surface of the coil. This tiny valve was to simulate a leakage or a pine hole of the coil. The situation of water leakage was recorded and discussed.
Experimental results show that the V shape dry coil can efficiently guide the condensed water to the water tray. Through the condensation detector, surface condensation can be prevented. Negative-pressure water supply system proved to be a good option for the prevention of leakage of chilled water.

並列關鍵字

Fan Dry Coil Unit -- FDCU(V-tipe)

參考文獻

[3] 董雲春, "紊流型潔淨室不同風口配置對通風效果之影響," 中興工程, vol. 96,pp. 39-45, 2007.

characteristics and temperature distribution in non-unidirectional cleanrooms for electronic industry. Building and Environment. 46(2011)1235-1242.

[6] T. Lin, Y-C Tung, S. C. Hu , C-Y Lin. (2010) Effects of the Removal of 0.1 μm Particles in Industrial Cleanrooms with Fan Dry Coil Unit (FDCU) Return Systems Aerosol and Air Quality Research. 10:571-580.

[7] 林祥輝, "空調機測試不確定度評估(上)," 中國冷凍空調雜誌, pp. 116-130,1999 年6 月.

[8] 林祥輝, "空調機測試不確定度評估(下)," 中國冷凍空調雜誌, pp. 126-138,1999 年8 月.