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標題: 熱泵應用在醫院熱水系統的節能分析
Studies on the Energy Saving and Green Gas Reduction by Heat Pump for the Hot Water System of Hospital
作者: 卓武輝
Chuo, Wu-Hui
關鍵字: Heat Pump;熱泵;Circulating Water System;Coefficient of Performance;Carbon dioxide emission reduction;性能係數;迴水型熱水系統;溫室氣體減量
出版社: 機械工程學系所
引用: [1] 鄭太一,「熱泵低溫除濕乾燥機之開發研究」,屏東科技大學機械 工程系碩士論文,2003年。 [2] 古瑞成,「氣冷式冰水熱泵暖房模式運轉之性能測試與分析」,元 智大學機械工程研究所碩士論文,1999年。 [3] Zaidi,J.H, and Howell, R.H,“Energy use and heat recovery in water-loop heat pump,variable-air-volume, four-pipe fan coil, and reheat HVAC systems: part-I,"ASHRAE Transactions, Vol.99, Part-2, pp.l3~28,199 [4] 沈英章,「能源節約明日之星一熱泵」,電機月刊第七卷第六期, 1997 年。 [5] 秦政平,「太陽能熱泵熱水器設計」,國立臺灣大學機械工程學研究所博士論文,1999年。 [6] 李璟柏,「太陽能輔助熱泵熱水器性能提升設計與評估方法研究」, 國立臺灣大學機械工程學研究所博士論文,2004年。 [7] 宋炎明,「熱泵系統應用於溫室內游泳池之節能分析」,國立臺北科技大學冷凍空調工程系所碩士論文,2005年。 [8] 李居芳,「臺灣地區家用熱泵熱水裝置性能實驗研究」,元智大學 機械工程學系碩士論文,2007年。 [9] Milan Marcic“Long-term performance of central heat pumps in Slovenian homes"Energy and Buildings 36 (2004) 185–193 [10] 李剛,「空氣熱源式熱泵之醫院節能應用」,國立台北科技大學冷凍空調工程研究所碩士論文,2005年。 [11] Thore Berntsson,“Heat sources — technology, economy and environment"International Journal of Refrigeration 25 (2002) 428–438 [12] Joseph C. Lam“Energy performance of air-to-water and water-to-water heat pumps in hotel applications"Energy Conversion and Management 44 (2003) 1625–1631 [13] Abdeen Mustafa Omer“Ground-source heat pumps systems and applications"Renewable and Sustainable Energy Reviews 12 (2008) 344–371 [14] 經濟部能源局指導財團法人台灣綠色生產力基金會節約能源中心提供95年熱泵熱水系統Q&A 節能技術手冊。
本研究係利用取熱自冰水系統的熱泵系統,建構適用於全年全時可供應熱水,且同時有冷房需求的醫院供應系統,完全取代原有的天然氣熱水鍋爐,達到節能減碳與降低運轉成本的目的,並可減少空氣污染排放。本研究採用製熱140 kW、製冷90 kW的熱泵系統兩組,從12℃的空調冰水迴水幹管取熱,用來加熱常溫的自來水。經過七個月(含冬天整季)的實際運轉,該熱泵系統可以完全滿足醫院熱水的需求,全棟21層樓供水溫度維持在45~50℃,供水量最高達75噸。本研究發現外氣溫度越高則單位熱水的耗能越低,一月份時,每產生一噸熱水約需耗電25度,六月份時可降到19度電。耗水量會影響熱水系統性能,耗水量越大,在固定熱損失下,單位水量的耗電相對的較少。此外,熱泵出口溫度越低則製熱效率越高,以97年2月熱水溫度設定54℃、每度水耗電25kWh,在97年6月熱水溫度設定52.8℃、則每度水耗電19kWh。七個月下來,與原來天然氣熱水鍋爐比較,可以節省能源費用共298萬元,並減少CO2排放量共256噸。此外,本系統之主要損失為管路熱傳約140kW,系統模擬結果也顯示再保溫後減少的管路損耗為73kW,本研究同時計算保溫前後系統的整體性能,估計熱泵的回收年限為1.8年,而加強保溫工程的回收年限為1年。

A heat pump system has been used in this study to replace a natural gas boiler for the supply of hot water in a medium size hospital. The heat pump capacity is 140 kW. Heat is absorbed from the ice water at 12℃ of an air conditioning system with a capacity of 90kW, and then used to heat up tap water at room temperature. The system has been running for seven months. It shows that the system can fully satisfy the hot water requirement of the hospital. The supplied water temperature is 45~50℃, and the maximum required rate is 75 tons per day. It is found that atmospheric temperature has significant effect on system performance. It consumed 25 kW-hr of electricity to produce one ton of hot water in January. However,only 19 kW-hr of electricity is required in June. Water consumption rate also affects the system performance. The higher the water consumption rate is, the better the system performance will be. Furthermore, reducing the operating condenser temperature would improve the system performance. According to the running record, energy cost has been reduced by 2.98 millions NT dollars in the past seven months, and the reduction in carbon dioxide emission has been cut by 256 tons. A model was developed in this paper to investigate the heat loss of circulating water, and to evaluate the effect of insulation on piping system. Results of calculations showed that the heat loss of circulating water might reach as high as 73 kW, and the payback of the system may be reduced to 1.8 years if insulation has been adopted. If only the cost of enhanced insulation is considered, the payback is one year.
其他識別: U0005-0602200916462600
Appears in Collections:機械工程學系所

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