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건물의 냉난방 운전을 고려한 3차원 동적 지중 열교환기 열해석 모델
백승효,Baek, Seung Hyo 한국토지주택공사 토지주택연구원 2018 LHI journal of land, housing, and urban affairs Vol.9 No.4
Application of geothermal energy in buildings has been gaining popularity as it provides the benefits of both heating and cooling a building. Among the various types of geothermal energy systems, ground-coupled heat pump system is the most commonly applied one in South Korea. A ground heat exchanger plays an important role as a heat source in winter and a heat sink in summer. For the stable operation of a ground-coupled heat pump system, a ground heat exchanger should be sized so that it provides sufficient heating and cooling energy. Heating and cooling energies generated in ground heat exchangers mainly depend on the temperature difference between the heating medium in ground heat exchangers and the surrounding ground. In addition, the performance of ground heat exchangers influences the change in ground temperature. Therefore, it is necessary to consider this interrelation between the change in the ground temperature and the performance of ground heat exchanger for an accurate estimation of its performance. However, previous thermal analysis models for ground heat exchangers are not competent enough to allow a complete understanding of this interrelation. Therefore, this study proposes a three-dimensional equivalent, transient ground heat exchanger analysis model. First, a previous thermal analysis model for ground heat exchangers, including an analytical model, a g-function, and a numerical model are analyzed. Next, to overcome the limitations of the previous models, a three-dimensional equivalent, transient ground heat exchanger model is proposed. Finally, this study validated the proposed model with the measurement data of the thermal response test, sandbox test, and TRNSYS DST model. All validation results showed a good agreement. These findings helped us to investigate the thermal performance of ground heat exchangers more accurately than the analytical models, and faster than the numerical models. Furthermore, the proposed model contributes to the design of ground heat exchangers by considering the different operation conditions of buildings.
백승효(Baek, Seung Hyo) 한국건축친환경설비학회 2020 한국건축친환경설비학회 논문집 Vol.14 No.2
Ground temperature recovery has a considerable impact on the performance of ground heat exchangers and ground-coupled heat pump systems. Some studies have found that consideration of ground temperature recovery in the design of ground heat exchangers allows for a reduction in the size thereof. Based on this finding, this study first investigates whether previous design methods and thermal analysis models for ground heat exchangers are appropriate for the design considering ground temperature recovery. We find that assumptions regarding heat extraction made in previous design methods make it difficult to consider ground temperature recovery. Simplified thermal analysis models for ground heat exchangers are also required to support the design. For these purposes, this study proposes an equivalent thermal analysis model for ground heat exchangers. This model is validated against measurement data of a sand-box test, and validation results demonstrate good agreement. We expect that the proposed model contributes to proposing design methods considering ground temperature recovery.
백승효(Baek, Seung Hyo) 한국건축친환경설비학회 2020 건축환경설비 Vol.14 No.2
Ground temperature recovery has a considerable impact on the performance of ground heat exchangers and ground-coupled heat pump systems. Some studies have found that consideration of ground temperature recovery in the design of ground heat exchangers allows for a reduction in the size thereof. Based on this finding, this study first investigates whether previous design methods and thermal analysis models for ground heat exchangers are appropriate for the design considering ground temperature recovery. We find that assumptions regarding heat extraction made in previous design methods make it difficult to consider ground temperature recovery. Simplified thermal analysis models for ground heat exchangers are also required to support the design. For these purposes, this study proposes an equivalent thermal analysis model for ground heat exchangers. This model is validated against measurement data of a sand-box test, and validation results demonstrate good agreement. We expect that the proposed model contributes to proposing design methods considering ground temperature recovery.
공동주택 바닥복사냉방시스템의 공급 냉수 온도 및 유량 설계에 관한 연구
백승효(Baek Seung-Hyo),정창호(Jeong Chang-Ho),신미수(Shin Mi-Su),이진영(Lee Jin-Young),여명석(Yeo Myoung-Souk),김광우(Kim Kwang-Woo) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(계획계)
The intent of this paper is to derive design data of the supply chilled water temperature and water flow rate for the radiant floor cooling system in Korean residential buildings. prEN-1264 standard and ASHRAE method were reviewed in order to derive design data. To verify application of the standard, mock-up tests were performed. The results show that prEN-1264 method is appropriate in case supply chilled water temperature is low. By using calculation method presented in prEN-1264 standard, design data for residential buildings was derived.
지역냉방 도입을 위한 공동주택 세대 내 냉방시스템 대안별 경제성 평가
백승효(Baek Seung-Hyo),정창호(Jeong Chang-Ho),이진영(Lee Jin-Young),조동우(Cho Dong-Woo),여명석(Yeo Myoung-Souk),김광우(Kim Kwang-Woo) 한국건축친환경설비학회 2010 한국건축친환경설비학회 학술발표대회 논문집 Vol.2010 No.3
The purpose of this study is to assess economic effects for cooling systems in on occupied zone when district cooling system in introduced in residential buildings. The study has been performed by using LCC method for the economic analysis. Alternative cooling systems has been narrowed down by considering heating systems adopted in residential buildings. The most appropriate alternative cooling systems in occupied zone are fan-coil unit system(FCU) and radiant floor cooling system(RFC). Based on the LCC analysis, radiant floor cooling system is deduced more economical cooling system than the others.
김지혜(Kim Ji-Hye),백승효(Baek Seung-Hyo),조재훈(Jo Jae-Hun),여명석(Yeo Myoung-Souk),김광우(Kim Kwang-Woo) 한국건축친환경설비학회 2007 한국건축친환경설비학회 학술발표대회 논문집 Vol.- No.-
Recently, stack effect occurs many problems in high-rise buildings, especially in winter season. Problems arise draft, diffusion of smoke and smell, whistling noise at elevator doors, difficulties in opening entrance door. To solve the problems caused by stack effect, different way can be adopted at each architectural stage. In design stage, design guideline for preventing stack effect is needed. In construction stage, construction checklist and method for increasing building airtightness is needed. In completion stage, diagnosis and solution as follow-up measures is needed. That is, integrative solution is required to manage stack effect problems through the whole architectural stage. The purpose of this study is to propose an access method and factors to be considered at each architectural stage for preventing stack effect problems. For this purpose, basic principles for preventing stack effect were investigated and factors to be considered for increasing airtightness of building envelop and partitioning off inside of building.