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열 파이프용 수평 축열조에서의 열 입력이 축열에 미치는 영향
박이동(Pak Ee-Tong),정운철(Jeong Un-Chul) 한국태양에너지학회 1996 한국태양에너지학회 논문집 Vol.16 No.2
본 연구에서는 실제 열 파이프용 수평 축열조에서 등간격인 Heating pad 수와 위치 및 공급열량을 변화시키면서 축열조내의 순수 Plume 유동특성을 파악하였다. 동일한 Heating pad수를 가지고 집중 배치 형태와 분산 배치 형태를 취하였을 때 집중 배치 형태로 취하는 것이 5~6% 정도의 더 높은 효율을 얻었다.<br/> 따라서 열 파이프용 수평 축열조에서 Heating pad를 장착할 때 동일한 Heating pad의 수에서는 집중(concentration)배치형태로 설계하는 것이 효과적임을 알 수 있다. The horizontal thermal storage tank with heat pipe which is suitable for the sensible heat storage system is able to store a hot water from the heat source such as heating pad efficiently and to supply a hot water to load rapidly. And arrangement of heating pad play an important role in thermal flow and thermal storage efficiency. In this experiments, number of heating pad is ranged from three, five and nine, and when there is no change on number of heating pad, arrangements are two types of concentration-type and dispersion-type. Strong entrainment take place in the case of concentration-type of heating pad, and rapid temperature rise (△T ≒ 1.6 ~ 3.2℃) in the tank is obtainable on the concentration-type than dispersion-type. In the constant number of heating pad, the concentration-type has the higher efficiency with about 5-6% than the dispersion-type Therefore, concentration-type of heating pad is an efficient design in constant number of heating pad.
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박이동(Pak Ee-Tong),정운철(Jeong Un-Chul),이도영(Lee Do-Young) 한국태양에너지학회 1997 한국태양에너지학회 논문집 Vol.17 No.2
본 연구에서는 실내로 유입되는 온기와 실내공기사이의 온도차 및 유입속도에 따라 발생되는 부력의 영향 및 실내로 유입된 온기의 혼합특성에 관한 열유동특성을 파악하였다. 혼합도의 정의로부터 임계속도(1.2~1.6m/s) 전 후로 기하학적영향에 대하여서 혼합과의 관계를 파악할 수 있었다. 그리고 축열효율과의 관계는 속도가 크고 기준온도차가 작을수록 부력의 영향을 적게 받아서 아네모스형, 베인형 모두 높은 축열효율을 나타냈다. 그리고 속도가 클 때는 베인형이 전반적으로 우수한 축열효율을 나타냈다. 따라서 유입속도에 의한 영향이 기준온도차에 의한 영향보다 지배적임을 알 수 있었다. A study on the distribution characteristics of inflowed warm air is important to analyze warm air storage in a room. Also, in point of energy saving during heating, warm air flow characteristics occurred by circulation and distribution of inflowed warm air should be analyzed, and the storage efficiency should be considered in order to increase efficiency of heating system.<br/> For this study, in the real-sized model room, the temperature differences between inflowing warm air and inner room air are 10, 20, 30℃ (3steps), and the flow rates of inflowing warm air are 0.5, 1, 2, 3rn/s (4steps) respectively as dynamic parameters. Also, anemos and vane diffuser are used as inlet geometric condition.<br/> Consequently, on geometric conditions, high thermal storage efficiency can be obtained with the vane diffuser, and heat flow characteristics depend on the inflowing velocity more than reference temperature difference.
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박이동,정운철,임종오 成均館大學校 科學技術硏究所 1992 論文集 Vol.42 No.2
The benefits of thermal stratification in sensible heat storage systems have been considered and studying by several investigators. In this paper, the basic data which is hard to obtain normally through experiments were obtainable through the computer simulation. The major objectives of the study were to assess the benefits of stratified storage in residential solar water heating application and to suggest the optimum design parameters. From the above computer simulation, following results were obtained. 1) The solar load fraction increases with increasing the number of tank segments. In these simulation, the magnitude of the improvement was about 10%. 2) The solar load fraction increases when the ratio of diameter to height of the tank(H/D) increases to 3, but H/D exceed 3 then, the solar load fraction decreases. In these simulation, the magnitude of the improvement was about 3 %. 3) Increasing the collector flow rate slightly improved the performance of the mixed storage system (Node = 1). Also, for the stratified storage system(Node = N), the solar load fraction increases with decreasing flow rate until the point is reached at which the collector outlet temperature reaches the boiloff limit of 100℃ over some portion of the simulation period.
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모형 수평 축열조의 열원 유입구 형상에 관한 실험적 연구
박이동,정운철,안성호 成均館大學校 科學技術硏究所 1993 論文集 Vol.44 No.2
The flow around a heat source rises through an inlet port of heat source and transports the thermal energy from heat source to storage water. The improvement of the geomtry of inlet port of heat source is able to enhance the thermal efficiency of horizontal storage tank and the rapidity of supplying thermal storage energy from heat source to load. In this experimental study, there are six kinds of thermal storage tank which have the different geometry of inlet port of heat source each other. This study is for choosing the tank which has the best thermal efficiency and the most rapid thermal flow in the same experimental conditions. Results have been obtained through this study as the following. Integrated tank system, specially round type, in this case, heat source is directly interposioned in the inlet port of heat source-the geometry of inlet port heat source-has the best thermal efficiency and the most rapid thermal flow. Therefore integrated tank system, specially round type, is suitable to store the sensible heat from the heat source efficiency and to supply thermal energy to load rapidly.
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