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Component Analysis of Thermally Activated Building System in Residential Buildings
정웅준,이유지,유미혜,박상훈,여명석,김광우 대한건축학회 2014 Architectural research Vol.16 No.4
The packaged terminal air conditioner, the typical cooling system for the residential buildings, consumes a large amount of electricity in a short period time during peak hours. In order to reduce the peak load and conserve the electricity, the thermally activated building system can be used as a secondary system to handle the partial cooling load. However, the thermally activated building system may cause condensation and under-cooling. Thus, design of both systems should be performed with careful investigation in characteristics of both systems to amplify the advantages. Since the thermally activated building system has the time-delay effect which may cause under-cooling, the system is designed to handle the base load of the building. Hence, simple simulation with EnergyPlus was performed to observe the characteristics of cooling load in residential buildings. Once the possible range of the load handling ratio of the thermally activated building system was decided, characteristics of system was analyzed in terms of hardware component and operation parameters. The hardware components were analyzed in plant and system aspects and the operation parameter was evaluated in the thermal comfort aspect. As the load handling ratio increased, the thermal comfort increased due to the lower radiant mean temperatures. Within the range of thermal comfort, the several adjustments were made in setpoint temperature and electricity consumptions of difference cases were observed to decide which components and parameters were important for designing the systems.
정웅준(Woong June Chung),최창식(Chang Sik Choi),여명석(Myoung Souk Yeo) 적정기술학회 2017 적정기술학회지(Journal of Appropriate Technology) Vol.3 No.2
현재 노후주택의 낮은 건물 에너지 성능을 개선하기 위해 적정기술을 적용하여 개선효과를 볼 수 있는 노후주택용 적정기술 개발이 필요하다. 노후주택을 위한 적정기술을 효율적으로 적용하기 위해서는 노후주택에서 발생하는 열손실이 가장 크게 일어나는 부위를 중심으로 개발해야하고 이를 위해서는 현재 노후주택 성능 실태를 파악해야한다. 본 연구를 실행하기 위해 노후주택 성능 실태조사를 실제건물을 대상으로 실행하였고 여러 가지 시나리오로 접근하기 위해 시뮬레이션을 실행하였다. 건물 성능을 파악하는 방안으로 건물의 열관류율과 침기량을 측정하였고 실측데이터를 바탕으로 시뮬레이션에 적용하여 취약부위를 밝혀냈다. 현재 정부에서 지원하고 있는 금액으로 취약부위 중심의 보수와 법규수준의 성능으로 모든 부위를 보수하는 대안을 바탕으로 경제성분석을 통해 앞으로의 적정기술 개발방향을 도출하였다. As the old houses have poor energy performances, appropriate technology for old houses needs to be developed for the effectiveness of retrofitting the building. For increasing the efficiency, the retrofit should be performed on the poorest building components, which needs to be evaluated based on the actual old houses. In this research, the performance of the old house was measured and simulation was performed to approach the solution in variety of alternatives. In order to evaluate the performance of old houses, the heat transmission coefficient and infiltration were measured. The measurements were used to simulate the building and poor building components were investigated. The economic analysis was performed by retrofitting the building with the support from the government and up to the performance in the building code. And the improvement idea was proposed based on the economic analysis.
주거건물의 냉방 부하 패턴에 따른 구체축열시스템 운전 방안
박상훈,여명석,유미혜,이유지,정웅준,김광우,Park, Sang-Hoon,Yeo, Myoung-Souk,Yoo, Mi-Hye,Lee, Yu-Ji,Chung, Woong-June,Kim, Kwang-Woo 한국주거학회 2012 한국주거학회 논문집 Vol.23 No.2
Compared to Packaged Terminal Air Conditioning Systems, Radiant Cooling Systems have the advantage of energy saving and thermal comfort. Thermally Activated Building System (TABS) is one of the radiant heating and cooling systems. The main difference between TABS and other radiant systems lies in the usage of the time-lag effect of storing heat energy in the concrete. Current energy usage in summer time is concentrated within a specific time by using Packaged Terminal Air-Conditioner (PTAC). Due to the time-lag effect of TABS, energy usage can be distributed to other time zones. To maximize this effect, it is important to determine the appropriate operating mode, which for TABS is dependent upon the cooling load generated by the occupancy schedule. In this study, occupancy schedules are determined for various residential types. The operating modes of TABS for these residential types are estimated by using a dynamic computational simulation method. The results indicate that the operating modes of TABS can be determined by residential type and occupancy schedule. The load handled ratio by TABS is set up differently according to the cooling load profile obtained from residential type and occupancy schedule. By using TABS, energy consumption could be reduced by 20% compared to PTAC.