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김덕우(Kim Deuk-Woo),박철수(Park Cheol-Soo) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.- No.-
Many countries have been interested in sustainable development of buildings for environmental preservation. Thus it is significant to assess building envelopes in terms of CO₂ emissions owing to Kyoto Protocol. In this paper, a Double Skin Facade(DSF) installed in a general office building was assessed by CO₂ emissions(one of the performance-based assessment). To predict CO₂ emissions caused by the building energy consumption, the dynamic simulation program(EnergyPlus) and CO₂ emission factor was used. Because DSF has various airflow regimes, pre-simulation runs were conducted to decide proximate optimal airflow regimes depending on seasonal variation. It is shown that the DSF can achieve 17.1-36.5% of annual energy savings.
김덕우(Kim Deuk-Woo),김영진(Kim Young-Jin),박철수(Park Cheol-Soo) 한국건축친환경설비학회 2011 한국건축친환경설비학회 학술발표대회 논문집 Vol.2011 No.10
This paper presents an overview of new trends in building simulation community. The following five research topics are addressed, (1) interoperability issues of the design/engineer community: data-centric interoperability or process-driven interoperability, which one is suited for energy performance simulation? (2) uncertainty analysis in energy performance simulation: how can we manage input parameters which include uncertainties? (3) agent-based energy performance simulation: how can we simulate the interactions between human and architectural environment in energy performance simulation? (4) co-simulation: what are the advantages of the co-simulation? (6) Modelica: what is the difference between causal and acausal modeling approach? The paper would be essential reading to those practitioners and researchers who seek to understand and apply the cutting-edge simulation techniques in a professional manner.
에너지 플러스를 이용한 이중외피 시뮬레이션 결과와 실제 비교
김덕우(Kim Deuk-Woo),박철수(Park Cheol-Soo) 한국건축친환경설비학회 2010 한국건축친환경설비학회 학술발표대회 논문집 Vol.2010 No.3
During the last several decades, double-skin systems have been widely introduced. Double-skin systems have advantages of reduction of asymmetric thermal discomfort, energy savings, glare avoidance, etc. Nowadays, several whole building simulation tools (esp-r, EnergyPlus, TRNSYS, TAS, IES VE, IDA ICE, VA114, BSim, etc.) are used for assessment of thermal and energy performance of Double Skin Facade (DSF) buildings. The aforementioned tools are well-posed for energy performance assessment of conventional systems & buildings but there is an ‘accountability’ issue whether such tools can accurately describe the transient heat and mass transfer phenomena occurring in the complex 3D geometry of DSFs. The paper describes an empirical comparison of EnergyPlus results with measurement. A series of experiments were conducted (open cavity, closed cavity for airflow and thermal simulation). In the paper it is shown that the EnergyPlus simulation model is accurate enough for thermal modeling, but there is significant difference in cavity airflow between the measurement and simulation prediction. The paper aims to investigate what causes such difference and what should be considered in modeling of DSF when using the EnergyPlus tool.
공동주택 환기 시스템의 Ping-pong 및 Onion 접근 방식 비교
김덕우(Kim Deuk-Woo),박철수(Park Cheol-Soo) 대한건축학회 2010 대한건축학회논문집 Vol.26 No.11
The coupling between a thermal and an airflow model is required for accurate simulation of natural or mechanical (hybrid) ventilation systems. Generally, two coupling approaches exist: "ping-pong" and "onion". Prediction of temperature and airflow rate between zones can be significantly influenced depending on the coupling method and selected time step. Therefore, this paper aims to find the appropriate coupling method and time step for three different systems (hybrid ventilation, energy recovery ventilator, and natural ventilation) in an apartment. For this purpose, EnergyPlus (thermal model) and CONTAMW (airflow model) were coupled in the MATLAB platform. It has been concluded that simulation outputs are dependent on the coupling methods and chosen time step. HVAC engineers and simulationists are required to carefully choose a coupling method as well as time step based on the systems of their interests.