冰水主機應用蒸發式冷卻提升能源效率與系統最佳化之研究

Energy Efficiency Improvement and Design Optimization of Chiller by Applying Evaporative Cooling

羅堉仁(Yo-Ren Lo)

指導教授 ： 柯明村

國立臺北科技大學/機電學院/冷凍與低溫科技研究所/碩士(2007年)

摘要

蒸發式冷卻為一種散熱效果極佳的機制，目前國內外廠商正積極以此方法應用在冷凍空調設備上以達到提高性能效率為目的。本研究以EXCEL內建之VBA撰寫成蒸發式冷卻系統之熱傳遞與性能分析程式，且針對國內已經開發此蒸發式冷卻系統機組進行實驗數據的性能檢測，並也對目前已經開發完成的機型評估其設計之優缺點。本研究依據實驗量測的數值採用自行研發的程式規劃出如何設計各項參數才能使此蒸發式冷卻系統在運轉平衡時，系統效能達到最佳。本篇主旨在於探討鰭片面積大小與銅Row數要如何搭配設計方能使系統效能達到理想值，本篇研究亦探討鰭片間距的大小以及銅管Row數的多寡對空氣側壓降造成的影響。我們同時也對灑水裝置進行實驗研究，並自行規劃設計出較佳且省電與省成本的灑水桿之噴灑裝置。

關鍵字

蒸發式冷卻 ； 最佳化 ； 灑水桿裝置

並列摘要

Evaporative cooling is one of the mechanism have optimized heat transfer performance, and foreign and domestic factories actively apply this method on air conditioning equipment to increase the performance efficiency at present.
This study have created performance analyze program for evaporative cooling system of heat transmission by VBA of the Microsoft EXCEL, and aiming at the evaporative chiller developed by domestic factories, performance measurement towards the experimental data is proceeded. Also, aiming at the developed evaporative chiller model, the merits and demerits of the design are assessed.
Moreover, we have used our program to plan on the working of the evaporative chiller towards a balanced design, so as to optimize the efficiency of the system.
The major part of paper discusses the means to design number of tube rows and geometric dimensions of the flat fin and tube heat exchangers, so as to optimize the performance efficiency.
At the same time, it discusses the effect of the fin pitch and number of tube rows towards the air-side pressure drop. Also, we are researching experiment for a water sprinkle device and planning to design which is both cost and electricity-saving.

並列關鍵字

Evaporative Cooling ； Optimal ； Water Sprinkle Device

參考文獻

[21] 陳易青，「冷藏展示櫃應用間接蒸發式冷凝器之節能效益分析」，台北科技大學碩士論文，中華民國93年。

[2] Yang, W.J. and Clark, D.W. “Spray cooling of air-cooled compact heat exchanges.” Int. J. Heat Mass Transfer Vol.18, pp. 311-317.

[5] Gray, D. L. and Webb, R. L., Heat Transfer and Friction Correlations for Plate Fin-and-Tube Heat Exchangers Having Plain Fins, Proc. 9th Int. Heat Transfer Conference, San Francisco, U.S.A., 1986.

[6] Wang, C.C., Chi, K.U., 2000c. “Heat transfer and friction characteristics of plain fin-and-tube heat exchangers: part 2: correlation.” Int. J. of Heat and Mass Transfer, 43:2692-2700.

[7] Cheng, W.Y. and Wang, C.C., Condensation of R-134a on enhanced tubes, ASHRAE Trans.100 part 2, pp. 809-817, 1994.