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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.
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%.