온수 추출특성에 관한 실험적 연구 = An Experimental Study on Characteristics of Hot Water Extraction

다국어 초록 (Multilingual Abstract)

A lot of research on energy storage process has been performed but few extraction process has been studied. In this study, extraction process of hot water stored in a hot water storage tank was analyzed according to dynamic and geometric parameters dominating the hot water withdrawal process.
For this study, the experiments of hot water extraction were carried out by changing withdrawal rates of hot water ranged from 4LPM to 8LPM (Q=4, 6, 8LPM) and by changing temperature differences between hot water initially stored in a storage tank and cold water inflowed to a storage tank ranged from 10℃ to 30℃ (△T=10, 20, 30℃). And also, single round port, perforated distributor (Aspect Ratio=2) and modified distributor (Aspect Ratio=2. 5) were used as a inlet and outlet shapes.
The purpose of this investigation was to experimentally determine what outlet conditions are favorable to enhance hot water extraction efficiency during the hot water withdrawal process.
As a results, during the hot water extraction, as the extraction rate of hot water decreased, at the same time the temperature difference between cold water inflowed to the storage tank and hot water initially stored in the storage tank increased and modified distributor I(MDI) was used outlet shape, thermocline appeared at the lower region of the storage tank, extraction efficiency of hot water increased.