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김덕우(Kim Deuk-Woo),박철수(Park Cheol-Soo) 한국건축친환경설비학회 2008 한국건축친환경설비학회 학술발표대회 논문집 Vol.- No.-
Interior blinds systems have been introduced to provide visual and thermal comfort as well as to reduce energy use in buildings. A wide variety of such systems exist in terms of thermal and optical properties, location(exterior, interior), physical configuration(size, distance) of the blind slats. The current problem with blinds is that their operation is not based on the dynamics of the room(space) but based on the static or manual control operated by occupants, although many studies recognized that dynamic control far outperforms static control. One of the reasons is that it is not easy to combine the room dynamics with any possible optimization algorithm. Hence, In this study, A whole building simulation program EnergyPlus and MATLAB optimization toolbox were integrated to solve for optimal control of interior blind systems. the paper addresses difference between static vs. dynamic control of interior blind systems in office buildings.
김덕우(Kim Deuk-Woo),박철수(Park Cheol-Soo) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.- No.-
As a series of ‘Performance Assessment of Building EnvelopesⅠ: Double Skin Facade', three types (interior, exterior, mixed (int.&ext.)) of lightshelves and RetroLux were examined in terms of CO₂ emissions. It is shown that the exterior lightshelf could achieve the most energy savings (9.6-38.7%) in general office buildings due to blocking solar radiation before entering the indoor space. However, the interior lightshelf is the worst (1.4-5.2%) among three of them. The RetroLux has two components: (1) sun-reflector (first louver component), (2) light shelf for improving daylight induction (second louver component). Due to these two components, solar radiation from windows is filtered depending on seasonal variation (solar altitude). Therefore, the RetroLux can reduce 18.0-27.9% of annual energy consumption (both cooling and heating), and 552-3,290 Won/㎡ㆍyr of operation cost is saved.
김종헌(Kim Jong-Hun),박상린(Park Sang-Lin),김덕우(Kim Deuk-Woo),박철수(Park Cheol-Soo) 한국건축친환경설비학회 2011 한국건축친환경설비학회 학술발표대회 논문집 Vol.2011 No.10
In the area of building simulation, modeling of occupants can be classified into three ways, (1) a deterministic approach, (2) a stochastic approach, and (3) a cognitive approach. The deterministic approach is most widely applied where occupants are modeled with a fixed schedule only. The probabilistic approach employs a statistical method to predict human behavior. The aforementioned two approaches regard the humans as static objects. To overcome this, a new modeling approach, so-called an agent-based simulation approach, is demonstrated in this work. By adopting the cognitive approach for agent-based simulation, occupants are modeled as agents who interact with their environments and other agents interactively. This study illustrates the difference between the cognitive approach and the deterministic approach, and benefits from agent-based simulation.
김덕우(Kim, Deuk Woo),박철수(Park, Cheol Soo),이승언(Lee, Seung Eon) 대한건축학회 2017 大韓建築學會論文集 : 構造系 Vol.33 No.5
Building energy performance simulation (BEPS) has been developed over the last decades. Substantial attempts have been made to enhance its capability and to transfer its technology into design practice. Despite these efforts, the BEPS tools are not pervasively used on daily basis during the design process for better decision making. Moreover, some skeptical researchers raise a question whether the BEPS tools are truly useful or not with regard to designers’ modus operandi. Such situation has raised doubts on the feasibility of the BEPS tools. The reasons for this situation include the following: inappropriate understanding with regards to the limitations of the simulation model, simulation tools, uncertainty of the reality, model complexity, user interface, etc. In this paper, the aforementioned causes are explored from the perspective of architectural and engineering designers. A concept of a net model capability is proposed, and it is explained when and how the simulation work can be relevant to design activities.
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.