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난방 및 급탕 부하를 고려한 태양열 온수 급탕 시스템의 시뮬레이션 해석
장환영(H.Y. Jang),김병기(B.G. Kim),서정세(J.S. Suh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
This paper is to simulate a solar water heating system under the several patterns of heat load by the dynamic simulation code(TRNSYS). This system consists of evacuated solar collector, a water-storage tank, an electronic heater, pump, controller, auxiliary heater and so on. The results of simulations will be presented on an annual data base for a Active Solar System, which provides domestic heating & hot water for a four-person family. The simulation model is used to evaluate the annual variation of annual energy performance, the solar fraction with respect to demand hot water temperature required, difference of space heating temperature and preset storage tank water temperature, and consumption profile of the domestic hot water demand.
실내 설정온도에 따른 태양열 냉난방 시스템의 동적 거동 해석
장환영(H.Y. Jang),이상범(S.B. Lee),정경택(K.T. Chung),서정세(J.S. Suh) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The thermal behavior of a building in response to heat input from an active solar space heating system is analysed to determine the effect of the variable storage tank temperature on the cycling rate, on and off temperature of a heating cycle and on the comfort characteristics of room air temperature. A computer simulation of the system behavior has been performed and verified by comparisons with various parameters. Especially, this study is focused on the effect of the system's performance when subjected to dynamic cooling loads. The heat input to the absorption system is provided by an array of solar collectors that coupled to a thermal storage tank.
난방 및 급탕 부하를 고려한 태양열 온수 급탕 시스템의 시뮬레이션 해석
장환영(H.Y. Jang),김병기(B.G. Kim),서정세(J.S. Suh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
This paper is to simulate a solar water heating system under the several patterns of heat load by the dynamic simulation code(TRNSYS). This system consists of evacuated solar collector, a water-storage tank, an electronic heater, pump, controller, auxiliary heater and so on. The results of simulations will be presented on an annual data base for a Active Solar System, which provides domestic heating & hot water for a four-person family. The simulation model is used to evaluate the annual variation of annual energy performance, the solar fraction with respect to demand hot water temperature required, difference of space heating temperature and preset storage tank water temperature, and consumption profile of the domestic hot water demand.
태양열 온수급탕 시스템에서 보조열원 연결방식에 따른 열성능 비교
장환영(Jang H. Y),김병기(Kim B. G),서정세(Suh J. S) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.11
This paper is to simulate a solar hot water system with auxiliary heater connected in series and parallel under draw profile. This system consists of two evacuated collectors of total aperture area of 4 m2, 300 ㎏ storage tank, 3 kW electronic heater, difference temperature controller, pump, and so on. Long term system performnace is estimated by using TRNSYS model with the weather data in Jinju, 2005. This simulation model is used to estimate the annual variation of annual energy performance, the solar fraction and system efficiency, with resperct to difference of hot water temperature(40℃, 50 ℃, 60℃) in two types system. The annual solar fraction obtained 86.3%, 72.0%, 59.7% in series, 65.6%, 33.4%, 15.1% in parallel and the system efficiency is 41% in series, 24.9%, 13.6%, 6.5% in parallel. The maximum auxiliary energy was needed during the months of December and January in both of all this system.
태양열 온수급탕 시스템의 부하패턴이 열성능에 미치는 영향에 관한 해석적 연구
김병기(B.G. Kim),장환영(H.Y. Jang),서정세(J.S. Suh) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.11
The performance of a solar water heater incorporating evacuated tubes was evaluated using a transient simulation program, TRNSYS. Simulations were performed for 60 degree of hot water load temperature and for 280 liter of daily hot water volumes and three 400liter of storage tank volumes. Three patterns of daily hot water consumption profile were used in the present study(morning, lunch and evening). The results show that the increase in solar fraction depends on the load profile, as well as the collector efficiency coefficient. Hot water draw profile has a large effect on the performance of the SDHWS, the morning load profile has the highest solar fraction. The annual solar fraction of the system, at the weather conditions of Jinju is approximately 84% at lunch load pattern, the 280㎏ of load volume, 400㎏ of tank volume and the 60 degree of load temperature.