冷卻水熱回收用於純水系統水源恆溫控制節能之研究

純水系統前段逆滲透 (RO，Reverse Osmosis)產水過程所流通過的水溫須控制在25℃，目的是增加產出水量亦提昇整體效能。因此，水溫控制熱源來自電熱式熱水鍋爐的加溫，耗用大量電能，為了減少純水系統耗能而進行節能改善，並對節能成效作深入的探究。本文主要研究內容分為純水系統恆溫控制及冷卻水熱回收節電效益分析。本文主要以新竹科學園區某半導體廠為案例，以全年供水量842,825 m3 ，由新竹寶山水庫供應水源，依需求供給自來水池儲水，蓄水溫度隨著季節性的不同而有所變化，全年可分成兩個時段。12~5月時段自來水池的進水溫度在17.7~20.9℃之間，另一時段6~11月水池進水溫度在22.5~24.7℃之間。本研究將較高溫的冰水機冷卻水，流經供水池熱交換獲得熱回收的效益。本研究之創新設計與實施方法驗證可以不啟動原設電熱鍋爐下，維持水溫在25℃。這兩時段的熱回收量分別為2,478,887,720 kcal及646,320,139 kcal，換算為原電熱式熱水鍋爐兩個時段的耗電量分別計算得2,882,428 kWh及751,535 kWh，一年合計節省3,633,963 kWh，換算總電費為8,716,510元。依據台電公告101年電力排放係數為0.532 公斤CO2 /度，計得每年減少排放18,572噸 CO2。以台北市大安森林公園25.8公頃，而每公頃樹林一年可以吸碳15公噸換算，本研究成果等同48座大安森林公園的吸碳量。

關鍵字

純水系統；水溫控制；逆滲透；熱回收；冷卻水；節約能源

並列摘要

In the water purification system water temperature has to be maintained at 25 ℃ before flowing through the Reverse Osmosis process. The temperature control is required to increase the water output and also the overall performance. Before water temperature was controlled by electric hot water boiler, and used much electric power. Feasibility of energy saving by heat recovery from condensing water was analyzed. A semiconductor fab in the Hsinchu scientific park was used as a case study. The annual water supply from the Hsinchu Baoshan Reservoir to the pure water system was 842,825 m3. Water temperature variation can be divided into two periods in a year. From December to May the water temperature lies in 17.7 ~ 20.9 ℃. However, for another period from June to November the water temperature lies in 22.5 ~ 24.7. Heat recovery was achieved by chiller condensing water flowing through the supply water pool. This innovative heat recovery was designed and implemented with the water boiler inactive. The measurement results show that heat recovery for the above two periods were respectively 2,478,887,720 kcal and 646,320,139 kcal, in order to maintain the pool temperature at 25℃. The heat values converted to electric energy saving of 2,882,428 kWh and 751,535 kWh. The total annual energy saving is 3,633,963 kWh, corresponds to a saving of NT＄8,716,510. The 2012 electricity emission factor from Taipower was 0.532 kg CO2 / kWh. The energy saving is calculated to reduce 18,572 tons of annual CO2 emissions. The Taipei Daan Forest Park is 25.8 hectares, and each hectare per year can absorb 15 tons of carbon equivalence. The reduction in CO2 emission achieved in this study is equivalent to 48 Daan Forest Park.

並列關鍵字

Pure water system ； Water temperature ； Reverse osmosis ； Heat recovery ； Condensing water ； Energy Saving

參考文獻

【4】S. Loeb and S. Sourirajan, Adv. Chem. Ser. 38, 117 (1962).

【6】D.R. Baker and H.A. Shryock, “A comprehensive approach to the analysis to the analysis of cooling tower performance,” ASME Journal of heat transfer, 1961, pp.339 - 346.

【13】G.E. Gong , F.H. Chen, Huan Su, J.Y. Zhou, Thermodynamic simulation of condensation heat recovery characteristics of a single stage centrifugal chiller in a hotel, Applied Energy, vol.91, 2012, pp.326-333.

【19】 ASHRAE, ASHRAE handbook – HVAC system & equipment , American society of heating, refrigerating and air conditioning engineers, Inc., Atlanta, USA 2008, Chapter 51.

【26】ASHRAE Handbook - Fundamental Volumn, 1997.

國際替代計量

冷卻水熱回收用於純水系統水源恆溫控制節能之研究

未授權

主題瀏覽