自來水揚水系統運用於冰水主機冷卻之節能技術研究

A Study on Energy Conservation Technology of Assistant Cooling to Chiller by Potable Water System

張明正(Men-Chen Chang)

指導教授 ： 李魁鵬

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(2010年)

摘要

鑑於某一用水量大之印刷電路板廠房空調冰水機系統耗能佔總秏電(含無塵室) 31%、 照明佔 5%、製程設備佔 55%、空壓佔 9%、其他 9%，且根據冰水主機學理，冷凝溫度每降低1℃，主機效率可提升2.5~∼3% ，因此本研究嘗試改變冰水主機普遍使用的冷卻水塔散熱系統，採用地下蓄水池所貯存大量且低溫之冷水作為冰水主機冷凝器冷卻水運用，在冬季水溫 10℃~15℃、夏季水溫 23℃~28℃ 運用揚水系統抽水至頂樓水塔過程中來冷卻一部 200RT 冰水機後再送至頂樓水塔供應製程用水需求，使蓄水池中低溫的冷水達最佳運用。利用較低溫度之冷水來直接冷卻冰水主機，使得冰水主機於效率和成本上達到最佳條件運作與節省能源之目的。
本研究採用實際測量整個冰水主機改善前後之全載運轉操作數據，並運用簡單線性迴歸模式建立改善前方程式作為基線，再將改善後冷卻水溫度、冰水溫度及冷卻水溫度輸入基線，進行耗能分析比較，其結果顯示冷卻泵浦節能10.06% 、冷卻風扇 3.67 % 、冰水主機11.05%，合計冰水機節能效益可達 24.78% 與零冷卻水散失補充、保養、加藥費用支出。

關鍵字

空調系統 ； 冷卻水塔 ； 節能 ； 冰水主機 ； 性能係數

並列摘要

A study showed that the power consumption of air-conditioning system are about 31％ of total consumption ( including clean room ) in a PCB factory, which consumed a lot of water in manufacturing process. The other power consumptions include 5％ of light system, 55％ of manufacturing machines, 9％ of the air compression system and 9％ of the others. The lower temperature of cooling water of chiller can efficiently reduce the power consumption of chiller to decrease operation cost and at the same time it can diminish the greenhouse effect. Therefore, the research uses potable water from reservoir in basement in place of popular cooling tower system, whose temperature is 10℃~15℃ in winter and 23℃~28℃ in summer. The potable water pumping system firstly cool a 200RT chiller before the water is pumped to the reservoir in the roof of building, which supplies the water for the demand of manufacture. It uses lower temperature water to cool the condenser of chiller for optimizing the operation and reduceing the operation cost to reach the purpose of energy saving.
The research has a real case to make improvement and get the data of chiller plant. It performs two different systems (an original cooling tower system and an assistant cooling to chiller by potable water system) to compare with each other through power consumption measurement. The result shows it can save 10.06% power consumption on cooling pump, 3.67% on cooling fans, and 11.05% on chiller. The chiller has 24.78% benefit on saving energy and saving the cost of adding chemical, cleaning, makeup water for cooling tower and maintenance expense.

並列關鍵字

Air-conditioning System ； Cooling Tower ； Energy Saving ； Chiller ； COP

參考文獻

[8] 黃博興，「空調主機節約能源方法」，中國冷凍空調雜誌，Jun，1992。

[1] Young-hak Song, Yasunori Akashi, Jurmg-Jae Yee, “Energy performance of a cooling plant system using the inverter chiller for industrial building,” Energy and buildings, July 2006.

[3] Ng, K.C., Chua, H.T., Ong, W., Lee, S.S., and Gordon, J.M., “Diagnostics and Optimization of Reciprocating Chillers: Theory and Experiment,” Applied Thermal Engineering, vol. 17, no. 3, pp.263-276, 1996.

[4] Gordon, J.M., K.C. Ng, H.T. Chua, and C.K. Lim, “How varying condenser coolant flow rate affects chiller performance: thermodynamic modeling and experimental confirmation.” Applied Thermal Engineering, vol. 20, pp. 1149-1159, 2000.

[5] Reddy, T.A., and Andersen, K.K., “An evaluation of classical steady-state off –line linear parameter estimation methods applied to chiller performance data, ” HVAC&R Research, vol.8, no.1, pp.101-124, 2002.