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김의종(Kim, Eui-Jong) 대한건축학회 2014 대한건축학회논문집 Vol.30 No.8
As construction of low-energy buildings becomes a rising issue, small-size energy systems can deal with loads in heating, domestic hot water(DHW) supplying, ventilation, and so on. A single apparatus containing all the system components is recently developed particularly in Europe. Since a single heat pump inside the apparatus must meet different energy needs, dynamic analyses are important for such a system. In this work, a simulation model of a selected multi-functional apparatus is developed in TRNSYS, one of the well-known dynamic simulation tool. Each energy component is defined using experimental results, and a final combined TRNSYS module is validated with experimentation carried out for the entire system. Results show that error is under 10% for all the testing cases. Transient simulations are run with the developed model to analyze the thermal behaviour of the apparatus. As the heat pump is operated in a way that the control priority is on DHW, auxiliary heaters are frequently operated when DHW signals are active and particularly for a not-well insulated building and when outdoor temperatures are low. Analysis results also show potential of connecting a solar thermal collector to the apparatus as proposed in an option by the manufacturer.
도시 차원의 건물 음영을 고려한 일사량 계산 모듈 개발에 관한 연구
김의종(Kim, Eui-Jong) 대한건축학회 2014 대한건축학회논문집 Vol.30 No.7
Recently, development of detailed urban energy consumption prediction tools becomes a rising issue as it can provide more quantitative and qualitative information for planning a sustainable city. One of the target physical phenomena related to the urban case is to correctly calculate the solar irradiance on building envelops with taking into account the shading and mask effects. The sunlit fraction(SF) is commonly used to calculate the effective beam solar irradiance, and the sky-view factor(SVF) is used for the precise diffuse irradiance in the urban context. Both indicators are also employed in this work, and they are calculated using the polygon clipping method. The proposed solar insolation calculation module is implemented in Python, and results from the module are compared with existing SketchUp Plug-in tools. Results show that SF and SVF obtained from the module are almost the same as the existing tools, giving only less than 2% errors over the year. A case study is also carried out for comparison between the urban case and the single building case. As expected, total monthly insolation in the single building case is overestimated with a mean difference of about 20%.
상향식 도시 에너지 수요 예측을 위한 건물 에너지 모델 개발에 관한 연구
김의종(Kim, Eui-Jong) 대한건축학회 2014 대한건축학회논문집 Vol.30 No.4
The bottom-up approach in city energy simulation is one of the key issues for planning sustainable cities. Other than some existing models, developments of sufficiently accurate and rapid building models are mandatory for use in urban energy analysis. From a common building model, a new simplified building model is deduced that has the same level of detail than the initial model. As the balanced realization reduction technique, the main simplification method, is applicable only to the linear and time-invariant systems, the initial reference model are modified in a way that all the non-linear characteristics inherent in the model are linearized with some simplification methods proposed in this paper. Results show that the obtained simplified model is capable of reproducing thermal dynamics as the reference model has. Particularly, the hourly peak load estimation with the proposed model is well matched with the initial reference model. Calculation time required for the annual energy simulation of a single building was less than 1 second using the proposed model.
천창을 이용한 중복도시설의 Silhouette현상 방지에 대한 연구
김의종(Kim. Eui-Jong),유경돈(Yoo. Kyoung-Don),최원기(Choi. Won-Ki),서승직(Suh. Seung-Jik) 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1
This study aims to analyze the silhouette phenomena which frequently happens in the buildings with particularly big-sized windows. To analyze them has the same objective as other researches dealing with environmental qualities have. In this paper, silhouette phenomena is estimated by a previously proposed criteria and expected to be solved with a skylight. Simultaneously, it is expected that the skylight can raise the indoor level of illumination. From the basis of these results, this study will intend for architects to consider the prevention of the silhouette phenomena as well as illumination in a design process.
내부 열용량을 고려한 수직 지중열교환기의 3차원 수치 모델 개발
김의종(Eui-Jong Kim) 대한설비공학회 2016 설비공학 논문집 Vol.28 No.7
A three-dimensional (3D) numerical model of the vertical ground-coupled heat exchanger is useful for analyzing the modern ground source heat pump system. Furthermore, a detailed description of the inner side of the exchanger allows to account for the effects of the thermal capacity. Thus, both methods are included in the proposed numerical model. For the ground portion, a FDM (Finite Difference Method) scheme has been applied using the Cartesian coordinate system. Cylindrical grids are applied for the borehole portion, and the U-tube configuration is adjusted at the grid, keeping the area and distance unchanged. Two sub-models are numerically coupled at each time-step using an iterative method for convergence. The model is validated by a reference 3D model under a continuous heat injection case. The results from a periodic heat injection input show that the proposed thermal capacity model reacts more slowly to the changes, resulting in lower borehole wall temperatures, when compared with a thermal resistance model. This implies that thermal capacity effects may be important factors for system controls.
트랜시스를 이용한 지열 응답 함수 경계 조건 검증 및 시뮬레이션 모델 개발에 관한 연구
김의종(Eui-Jong Kim) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.9
To verify different boundary conditions on the borehole wall, which are commonly used for generating g-function, the well-known TRNSYS simulation model, DST (Duct STorage), is employed. By letting the fluid circulation determine the borehole wall conditions, a DST-based g-function is induced with numerical processes proposed in this work. A new TRNSYS module is also developed to accommodate g-function data and predict dynamic outlet fluid temperatures. Results showed that the modified g-function, which is different from Eskilson’s original g-function, is closer to the DST-based g-function. This implies that the uniform heat transfer rates over the height can be used for good approximation. In fact, simulations with the modified g-function showed similar results as the DST model, while Eskilson g-function case deviated from the DST model as time progressed.