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류남진(Ryu Nam-Jin),한유리(Han Yury),박윤철(Park Youn Cheol) 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.4
This study is conducted to improve the efficiency of a thermal storage tank. The thermal storage tank was designed to store heat energy that obtained from the solar or the others heat sources. However, it has difficulties in storing heat with nonuniform temperature through the entire tank with respect to the vertical direction. This study is focused on the thermal stratification to improve thermal comfort for the resident in house. To enhance temperature stratification of the tank, a distributor was designed and installed in the middle of the storage tank vertically. The vertically designed distributor could supply the return water with stratified temperature in the storage tank with respect to the height. The water velocity from the distributor hole is the same with the other outlet in the distributor. However, gravity effect on the flow in the storage tank is much higher than that of the velocity effect due to that Froude Number is less than 1. During the heat charging process in the storage tank, temperature maintained with little difference with respect to the height. However the charging process takes long time to get a effective temperature for the heating or hot water supply because of all of water in the storage tank needs to be heated.
곽희열(Kwak, Hee-Youl),주홍진(Joo, Hong-Jin) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
The Purpose of this study was thermal performance of solar hot water and space heating thermal storage tank. The combi storage tank was designed Tank in Tank type. The tank volume for space heating was 700 ell and tank volume for hot water was 150 ell . Tank in Tank type storage tank was to replace heat exchange to hot water tank. The result showed that the Heating value was 67.25MJ and domestic hot water value was 51.93MJ. Supply to the hot water volume was 521 ell more than about 3 times as that of the hot water tank volume.
정재동,박주혁,조성환 대한설비공학회 2004 설비공학 논문집 Vol.16 No.11
This study is to systematically analyze the effect of various kinds of design factors on the performance of stratified thermal storage tank. Taguchi method, known as a very reasonable tool in the parametric study, is employed in the present work. Three dimensional unsteady numerical experiment is conducted for 4 design parameters of stratified thermal storage tank: inlet Reynolds number, Froude number, diffuser size with 3 levels (Re=400, 800, 1200, Fr=0.5, 1.0, 2.0 and150mm, 200mm, 300mm) and diffuser shape with 2 levels. Orthogonal array L18(2×37) is adopted for the analysis of variance. The result gives quantitative estimation of the various design parameters affecting the performance and helps to select the main factors for the optimum design of stratified thermal storage tank. Reynolds number is found to be the most dominant parameter and the diffuser shape plays significant role on the performance of stratified thermal storage tank. Based on this finding, the prior questions on the contribution of the diffuser shape proposed by the authors become clear. The optimum condition for the performance is a set of300mm, Re=800, and radial regulated plate diffuser. Conformation test shows the repeatability in the analysis and 1.3% difference between the estimated thermocline thickness and that of numerical result.
태양열 난방 일체형 복합시스템의 축열조 효율개선에 관한 연구
류남진(Lyu, Nam-Jin),고광수(Ko, Kwang-Soo),한유리(Han, Yu-Ri),박윤철(Park, Youn-Cheol) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
This study is conducted to improve efficiency of thermal storage tank. The thermal storage tank was designed to store heat energy that obtained from solar or the others heat sources. However, it has difficulties in storing heat with uniform temperature through the entire tank with respect to vertical direction. This kind of maldistribution of the supplied heat to the storage tank effects on the system performance. In this study is focused on utilization of the thermal stratification to improve thermal comfort for people in the house. To enhance temperature stratification of the tank, a distributor was designed and Installed in the middle of the tank. The distributor is supplies hottest water to the top side of the tank which is very close to inlet of the supply line to the heating load. The hottest water that is accumulated on top side of the tank is firstly supplied to the load with higher temperature. Reminder water takes a little time to warming up until desired supply temperature reached. This kind alternating selection of the supply temperature is improve thermal comfort with moderated system performance.
권재욱(Jae-Wook Kwon),홍희기(Hiki Hong) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
Large-scale active solar heat systems are generally using heat exchanger between collector and storage tank loops to prevent damage by freezing. It is difficult to maintain stratification in the storage tank in the system in order to raise the flow rate enhancing heat transfer rate. In the previous study, we introduced a spiral-jacketed storage tank and obtained good results to keep system performance of general level without better stratification. We added a coil-shaped heat exchanger on the upper side in the spiral-jacketed storage tank. As a result of the experiment, it was verified that degree of stratification of the new type storage tank is higher than that of the previous one with a possibility of better collector efficiency and solar fraction.
김진홍,최봉수,홍희기,김용식 대한설비공학회 2005 설비공학 논문집 Vol.17 No.4
The simplification of solar thermal systems reduces the possibility of operating trouble and lowers the cost of the initial investment and maintenance. This also leads to increased competitiveness in the energy market. We proposed a spiral-jacketed storage tank that functions both as a heat exchanger and expansion tank, which removes the secondary piping and markedly simplifies the entire system. The new storage tank was designed and manufactured to maintain the same performance as the conventional system and the exiting system was remodelled by adopting the newly proposed storage tank. This experiment was conducted under real conditions over a period of several months. The retrofitted system with the spiral-jacketed storage tank showed good performance that is on a similar level as the previous system having a typical storage tank and heat exchanger.
삼온제어와 상하부가열 축열조를 갖는 태양열 시스템의 실증실험
이용걸(Longjie Li),김종현(Jong-Hyun Kim),홍희기(Hiki Hong) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
The verification experiment for a solar thermal system with upper-and-lower heating storage tank and three-temperature-point control was conducted at a laboratory building of Kyung Hee University . Three-temperature-point control uses the temperatures at uppermost storage tank other than at collector and storage tank exits. It was verified whether the setting values used in the device are appropriate. As a result of the experiment, it was turned out that the stratification is enhanced through upper heating and the hot water can be suppied earlier because of rapid increase of the uppermost temperature at the storage tank.
장철용(Jang Cheol-Yong),조수(Cho Soo),최석용(Seok-Yong Choi) 한국태양에너지학회 2008 한국태양에너지학회 학술대회논문집 Vol.- No.-
The stratification effect was investigated with four different types of diffuser shape in a thermal storage tank. For this study, experimental facility was constructed, which was composed of experimental thermal storage tank, hot and cold water storage tanks, boiler, chiller, data acquisition system, etc.. Visualization and lab scale experimental result showed that radial curved type diffuser was the highest degree of stratification among the four diffuser shapes.
기상조건과 축열조 용량에 따른 평판형 태양열 집열기 시스템의 동적 성능 해석
박배덕(Park Bae-Duck),김규덕(Kim Gew-Deok),김경훈(Kim Kyoung-Hoon) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.6
Solar energy has attracted wide attention as a promising renewable energy source. The goal of this paper is to estimate the dynamic performance of solar flat plate collector system according to the weather conditions and the capacity of heat storage tank. This study provides a detailed description of the modeling methods and materials of the system. The effects of the daily clearness index and the volume of the heat storage tank on the hourly and daily performances of the system are numerically investigated. Special attention is focused on the important system variables including the solar insolation on the collector surface, useful energy, heat loss at the collector, and collector efficiency.
디퓨저 타입 계간 축열조 내부 열성층화에 대한 입구 유속 및 탱크 종횡비 영향 연구
김성근(Seong Keun Kim),정성용(Sung Yong Jung) 한국가시화정보학회 2021 한국가시화정보학회지 Vol.19 No.3
In this study, the thermal stratification in solar seasonal thermal storage tanks was numerically simulated. The effects of the aspect ratio (AR) and inlet velocity on the thermal stratification in the diffuser type heat storage tank were investigated. The temperature distributions inside the tank were similar with velocity fields. Jet flows from opposite diffusers encountered each other at the tank center region. Thereafter, the downward flows occurred, and this flows strongly affected the thermal stratification. When AR was smaller than 2, these downward flows influenced a further distance and enhanced mixing inside the tank. Thermal stratification was evaluated by thermocline thickness and degree of stratification, and AR of 3 had the highest degree of stratification. The inlet velocity effect was expressed with the ratio (Re/Ri) of Reynolds and Richardson numbers. The second-order approximation was found for the relationship between the thermocline thickness and log Re/Ri.