利用淺層溫能熱交換器於建築物中的性能分析與研究

Abstract

本研究利用地下淺層長年均溫的特性，將淺層溫能熱交換器(Earth-Air Heat Exchangers, EAHE)系統結合於建築物當中，除了達到節能的效果外，也在建造建築物時，結合建築設施以降低建置成本，使系統在節能的同時也兼顧經濟上的效益，本研究分別針對兩種淺層溫能熱交換器進行研究：一、水基型空氣熱交換器(Water-based Earth-Air Heat Exchanger, WEAHE) 結合建築物本身的筏基蓄水池；第二、土壤空氣熱交換器(Earth-Air Heat Exchanger, EAHE)配合開挖深度埋設。兩者皆以配合現有空調系統調控室內溫度。 在夏季時進行研究，實際操作的結果均能達到降溫之效果，其出風溫度與土壤溫約差2℃左右，與筏基水溫度約差1℃左右，以實際數據為例，在平均入風溫度32.5℃，平均筏基水溫度24.6℃下，WEAHE系統能降至25.4℃。因此WEAHE系統可提供4.8kW的冷卻能力，並在耗電量0.8kW下，系統效能可達6.1。相比傳統冰水主機系統，WEAHE所帶來的節能效益高達到77%；而在平均入風溫度33.6℃，平均土壤溫度23.2℃下，EAHE系統則能降至25.1℃。因此，EAHE系統可提供12.7kW的冷卻能力，並在耗電量1.1kW下，系統效能可達11.5。相比傳統冰水主機系統，EAHE所帶來的節能效益達到78%。 經實驗量測，使用淺層溫能熱交換器能實現以低耗能的方式來提供空調之預冷效果。在建造方面，WEAHE與EAHE相比傳統冰水主機成本差異分別為68% 與57%，因此，淺層溫能熱交換器系統不僅有節能的優勢，更具有建置成本上的經濟競爭力。

Based on the knowledge of the stable temperature of the earth, this research integrates the Earth-Air Heat Exchangers (EAHE) system into building design. In addition to saving energy, this EAHE system helps reducing the construction costs of buildings. In other words, the system is both energy-efficient and economical. This research studies two types of EAHE: (1) the Water-based Earth-Air Heat Exchanger (WEAHE) that is integrated into the raft foundation of buildings and (2) the EAHE that is installed according to the depth of the excavated area of foundation. Both WEAHE and EAHE systems assist the pre-installed air-conditioning systems in regulating indoor temperature. Conducted during the summer, this research concludes from actual operations that the EAHE system has cooling effect on buildings: the temperature of the outlet air is 2℃higher than that of the soil and from 1℃ higher than water. According to the data of this research, with the mean inlet air temperature at 32.5℃ and mean water temperature at 24.6℃, the temperature of the WEAHE system can be reduced to 25.4℃. Therefore, the system can provide cooling capacity at 4.8kW. Additionally, with the power consumption at 0.8 kW, the system efficiency can reach 6.1. Compared to traditional air-conditioning systems, the power efficiency of WEAHE can reach 77%. With mean inlet air temperature at 33.6℃ and mean soil temperature at 23.2℃, the temperature of the EAHE system can be lowered to 25.1℃. Therefore, EAHE can provide cooling capacity at 12.7kW. Additionally, With the power consumption at 1.1kW, the system can reach 11.5. Compared with traditional air-conditioning systems, EAHE can save 78% of the energy. Through experimental measurement, this research shows that the EAHE system can provide an economical and energy-efficient means to cool down buildings when integrated into the original facilities. As the data suggests, the construction costs of buildings with the WEAHE and EAHE systems are 68% and 57% lower, respectively, than those with traditional air-conditioning systems. In conclusion, both systems are not only energy-efficient but also economically competitive.