由於冰水機是中央空調系統設備中最大耗電的項目,對節能具有關鍵性重要的影響。本論文說明在台灣的氣候條件下螺旋機式冰水機操作採用變頻驅動,COP值遠優於閥塊控制機組。 本研究過程中使用滿液螺旋機組,依變頻和固定閥塊控制方式,且按照ARI對在各種負載、冷卻水進水溫度和冰水出水溫度條件下,進行冰水主機運轉測試,將所測得之數據進行迴歸分析,最後再藉由DOE-2模擬辦公、旅館及醫院等建築類別之節能分析比較。 研究結果顯示,變頻與固定閥塊控制機組供應冰水機的冷卻水溫度從29 ℃降至18 ℃時,由實驗得知變頻機組的COP值大於固定閥塊控制機組的COP值;冰水機組依負載採用閥塊控制與變頻控制兩者之COP比較,顯示變頻控制之COP比閥塊控制之COP值大17%~30%;若冰水機組以運轉及初設成本角度考量,變頻器之初置成本於1年內,即將變頻器成本節省回來,且達到環保節能觀念。本論文的研究結果提供專業人士在選擇螺旋式冰水機時的參考,期待應用變頻機組更普遍作為空調系統有效節能的方式。
As chiller for central air-conditioning system is the largest power equipment in the project, the crucial importance of energy-saving impact. The performance tests of the VSD mode and slide-valve mode are in accordance with the ARI Standard ARI-550.590. The curve fitting data of the testing results are inputted for DOE-2 energy simulation models of the office, hotel and hospital building types to do energy-saving analysis and comparison. This research showed that the part load efficiency of variable speed drive control mode of flooded screw chiller is 17% to 30 percent better than that of the slide-valve control mode. Under the climate conditions of Taiwan , the energy consumption of variable speed drive control mode of flooded screw chiller is much lower than that of the slide-valve control mode. The simple pay back year of the additional cost of VSD is about 1 year.