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오피스건물에서 구체축열시스템의 최적 제어 및 운전 방안
임재한(Jae-Han Lim),이윤선(Yoon-Sun Lee),이겨레(Keo-Re Lee) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.11
구체축열시스템은 구조체 축열로 인한 시간지연 특성을 고려하여 적절한 운전 제어를 통해 건물에서 최대 냉난방 부하를 저감함으로써 에너지 비용을 낮출 수도 있다. 반면, 국내의 고온다습한 하절기 기후 조건에서는 냉방운전시 방열면에서 결로 발생 위험이 상존하고 있다. 그러므로 본 연구에서는 오피스건물을 대상으로 적용방안을 도출하기 위해 기존 적용 사례 특성을 조사 분석하고, 동적 에너지해석 시뮬레이션을 통해 냉방운전시 결로방지 및 에너지 성능 특성에 대한 분석을 수행하였다. 이를 위해 우선 국내의 구체축열시스템 적용사례 및 국내 건축물 설계기준을 고려하여 오피스건물을 대상으로 건물 모델링을 구성하였고 이를 대상으로 구체축열시스템과 공조시스템의 통합운전인 구체축열 통합시스템을 구성하였다. 구체축열시스템과 변풍량시스템의 통합운전과 구체축열시스템과 외기전담공조시스템의 통합운전의 냉방에너지 성능을 비교하고 외기전담공조시스템 구성에 따른 냉방에너지 성능을 평가하였다.
이현화(Lee, Hyun-Hwa),이수진(Lee, Soo-Jin),김수민(Kim, Su-Min),임재한(Lim, Jae-Han),송승영(Song, Seung-Yeong) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.11
TABS(Thermally Activated Building System) has recently applied by huge commercial buildings, airport, and convention center in Europe. The former provide night-time thermal storage by heating or cooling, while the latter embedded water based heating and cooling system, which uses a high thermal inertia of concrete in building construction where a heating or cooling pipe is embedded. The aim of this study is to analyze thermal storage and thermal output of TABS applied with PCM (Phase Change Material). To achieve this paper, prototypes of TABS and PCM were developed, the simualtion program Physibel Voltra 6.0W was used, and thermal strage and thermal output were evaluated according to heating operation schedule.
주거건물의 구체축열시스템 적용 시 비정상상태 해석을 반영한 설계 방법에 관한 연구
이유지(Lee, Yu-Ji),유미혜(Yoo, Mi-Hye),정웅준(Chung, Woong-June),박상훈(Park, Sang-Hoon),여명석(Yeo, Myoung-Souk),김광우(Kim, Kwang-Woo) 대한건축학회 2012 대한건축학회논문집 Vol.28 No.11
The thermally activated building system (TABS) is a thermal storage that uses the concrete slab to reduce the peak cooling load. A radiant cooling/heating system is typically designed with consideration on a peak load in a steady state to size the capacity. However, the design of the TABS should consider the time-lag effect due to the high heat capacity of the concrete slab in an un-steady state. Temperature of the concrete slab cannot be changed instantly, which may cause overcooling, overheating and condensation. This paper analyzed the design method considering the un-steady state using building simulation for more effective application of TABS. In order to achieve the objective, applicable range of the load handled by TABS should be determined. And the design method to operate the TABS with steady supply water temperature and operation period is proposed.
RC 네트워크 모델 및 유한차분법에 의한 구체축열시스템의 방열량 해석
송진희(Song Jin-Hee),구보경(Koo Bo-Kyoung),송승영(Song Seung-Yeong),임재한(Lim Jae-Han) 한국건축친환경설비학회 2011 한국건축친환경설비학회 학술발표대회 논문집 Vol.2011 No.10
This study is focused on the evaluation of thermal output of TABS(Thermally Activated Building System) according to the ISO 11866. The aim of this study is to evaluate TABS in terms of the temperature difference between heating medium supply temperature(Ts) and return temperature(Tr), thermal output and the surface temperature distribution according to the design flow rate and the design flow temperature. For this purpose, the RC network model and FDM method in ISO 11866 were firstly reviewed. Through the transient heat transfer simulation using temperature calculation using Cranck-Nicolson FDM using Physibel Voltra 6.0W, the temperature difference between Ts and Tr, thermal output and the surface temperature distribution of specific TABS was calculated and evaluated. The results show that specific thermal output and temperature difference at 60℃ of supply water temperature were about 162 W/m², 13.6℃ respectively.
주거건물에 구체축열시스템 적용 시 운전시간에 따른 에너지 절감량 분석
이유지(Lee Yu-Ji),유미혜(Yoo Mi-Hye),정웅준(Chung,Woong-June),박상훈(Park Sang-Hoon),여명석(Yeo,Myoung-Souk),김광우(Kim Kwang-Woo) 한국건축친환경설비학회 2011 한국건축친환경설비학회 학술발표대회 논문집 Vol.2011 No.10
The thermally activated building system(TABS) is a thermal storage that uses the concrete slab to reduce the peak cooling load. A typical design method of cooling system considers a peak load in a steady state. However, the design of the TABS should consider the time-lag effect due to the high heat capacity of the concrete slab in an un-steady state. Therefore, this paper analyzed the performance of the TABS by examining the energy consumption and saving for different operation period and supply water temperature without over-cooling and condensation.
유미혜(Yoo Mi-Hye),이유지(Lee Yu-Ji),정웅준(Chung Woong-June),박상훈(Park Sang-Hoon),여명석(Yeo Myoung-Souk),김광우(Kim Kwang-Woo) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(계획계)
In summer, energy consumption of air conditioner is a large part of building energy consumption and it may cause electric overload. In order to reduce the energy consumption, a radiant cooling system can be one of the solutions, because it uses water instead of air. Especially Thermally Activated Building System(TABS) is a type of radiant cooling that uses a structure as a thermal storage by embedding pipes in concrete slab. This research investigates total energy consumption and peak energy consumption of the air conditioner and the air conditioner integrated with TABS in residential buildings to evaluate the energy performance.
구체축열시스템과 외기전담공조시스템이 통합 적용된 오피스건물에서 냉방에너지 소비량 특성
이윤선,이겨레,임재한 한국건축친환경설비학회 2019 한국건축친환경설비학회 논문집 Vol.13 No.2
Thermally activated building system (TABS) has been regarded as one promising technology for energy saving and green-house gas reduction due to the efficiency improvement of a cooling/heating equipment, and feasibility of combining other promising technologies such as ground source heat pumps or cooling towers. TABS can be achieved by running hot/cold water through pipes embedded in a building’s construction. Compared to conventional HVAC systems, TABS delivers higher water temperatures for cooling, and lower water temperatures for heating due to large heat exchange areas. Furthermore, water systems have less transport energy and ductwork spaces compared to existing air systems, due to high thermal capacitance of water. Because of the surface condensation problems in hot and humid weather conditions, TABS needs to be integrated with dehumidification system such as variable air volume (VAV) system or dedicated outdoor air system (DOAS). This study aims to evaluate the cooling energy consumption characteristics of thermally activated building system (TABS) integrated with DOAS in office building compared to the TABS with VAV system. In this study, the design cooling load in office building was firstly evaluated and indoor thermal environment was discussed by considering the surface condensation risk. Finally the cooling energy consumption of TABS with DOAS was compared with TABS and VAV system operation. When the total cooling energy consumption during the cooling period is compared, it is found that the integrated operation of TABS with DOAS is 24% more energy-efficient than integrated operation of TABS with VAV. Night-time electric energy consumption accounts for 34% of the total cooling energy consumption.
구체축열시스템의 설계인자 조합에 따른 방냉량 영향도 분석에 관한 연구
박상훈(Park Sang-Hoon),김일민(Kim Il-Min),구소영(Koo So-Young),여명석(Yeo Myoung-Seok),김광우(Kim Kwang-Woo) 한국건축친환경설비학회 2010 한국건축친환경설비학회 논문집 Vol.4 No.3
The Radiant heating and cooling system could save building energy by using the mechanism of radiant heat transfer. TABS(Thermally Activated Building System) is one of the radiant heating and cooling system. The main difference between the other radiant system and TABS is the usage of the time-lag effect by storing heat energy at the concrete. It enables the building to shift peak loads to night time. Because TABS are installed at the building structure there are some considerations when design TABS. The purpose of this study is to estimate the effect of the design factors to the heat flux. In this study the design factors of TABS are classified by using EN and ASHRAE. Also EN1264 offers the heat flux calculation method to calculate the heat output from TABS. The heat flux are estimated as combination of these design factors by EN1264. By analysing the curve of heat flux as change of design factors, the tendency and the effect of design factors could be estimated. When designing TABS the result of this study could be used to determine the priority and the range of the design factors.
핵 교리 진화의 공통 경로와 최근 북한의 핵 확전 개념
황일도 세종연구소 2021 국가전략 Vol.27 No.3
By way of the declaration of tactical nuclear development at the 8th Party Congress and the continuing short-range missile modernization program, the prediction that North Korea would use its nuclear weapons as a war-fighting capability in the theater of Korean Peninsula is becoming a palpable reality. This evolution of nuclear doctrine replicates the common pattern of the denial deterrence & first use doctrine adopted by several nuclear-armed states, which face potential enemies on land borders and whose conventional capabilities are inferior to the opponents. These precedent countries have sought the possibility to countervail conventional inferiority by lowering the threshold between conventional warfare and tactical nuclear exchange as much as possible, while avoiding strategic nuclear retaliation even after their first use of tactical nuclear weapons. As it seems salient that the North Korea’s nuclear escalation concept is also changing in a similar orientation, the ROK-US alliance's deterrence strategy needs to be focused on how to stymie the expectation of Pyongyang that the stages of tactical nuclear use and strategic nuclear use could be insulated, on the bedrock of sophisticated understanding of the country's escalation notion. 8차 당대회에서의 전술핵 개발 선언과 계속되는 단거리미사일 현대화 프로그램을 통해 북한이 핵무기를 한반도 전구 내에서의 실전전력(war-fighting capability)으로 활용하려 할 것이라는 예측이 현실화되고 있다. 기존의 대미 응징억제 교리에 더해진 이러한 핵 교리 진화는 ▵잠재적국과 국경을 마주하고 있고 ▵해당 잠재적국에 비해 재래식 전력이 열세였던 핵무장 국가들이 예외 없이 택했던 거부억제-핵선제사용 교리의 공통적 패턴을 재현하는 것이라 할 수 있다. 이들 선행사례 국가들은 재래식 교전과 전술핵 교전 사이의 문턱(threshold)을 최대한 낮춤으로써 재래식 열세를 상쇄하는 한편, 전술핵 사용 이후에도 전략핵 응징보복을 피할 수 있는 가능성을 모색해 왔다. 북한의 핵 확전 개념 역시 유사한 방향으로 변화하고 있다고 판단되는 바, 한미연합측의 억제 전략은 북측 확전 개념에 대한 정교한 인식을 바탕으로 전술핵과 전략핵 교전 단계가 분리될 수 있을 것이라는 평양의 기대를 효과적으로 저지하는데 집중될 필요가 있다.