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주상복합 건축물의 기초 슬래브에 설치된 수평형 지열교환기의 계절별 성능평가
황광일,우상우,김중헌,신승호,김용식,Hwang, Kwang-Il,Woo, Sang-Woo,Kim, Joong-Hun,Shin, Seung-Ho,Kim, Yong-Shik 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.2
This study evaluates the seasonal performances of the horizontal-type geothermal heat exchanger(HGHEX) installed into the foundation slabs of the complex building located at Seoul. The geothermal system is consisted with totally 31,860m long HGHEX, 16 GSHPs (Ground-source Heat Pump) and 8 circulation pumps. This system supplies cooling and heating to the lobby(F1) and the common spaces(BF1). The average heat exchange temperature differences are $2.7^{\circ}C\;and\;2.5^{\circ}C$ in the summer, $1.5^{\circ}C\;and\;0.5^{\circ}C$ in the winter for the F1 and BF1 respectively. From these results, approximately 400Gcal and 180Gcal of geothermal energy are assumed to have been used during the summer and winter seasons respectively. As a conclusion, the geothermal system is reviewed as a effective utility for heating and cooling at the point of seasonal performances.
연구ㆍ사무공간의 냉난방용으로 설치된 400RT급 수직형 지열시스템의 봄철 성능평가
신동걸(Dong-Keol Shin),김중헌(Joong-Hun Kim),신승호(Seung-Ho Shin),황광일(Kwang-Il Hwang) 한국지열·수열에너지학회 2008 한국지열에너지학회논문집 Vol.4 No.2
400RT geothermal system which is consist with vertical-typed 112 geothermal heat exchangers is measured and evaluated in spring, 21st~24th May 2008. As the results, the average temperature difference between inlet and outlet of geothermal pipes is 1~2℃ and that of cool water supply is 2~6℃, when being normally operated. Despite temperature fluctuations by cooling loads, the average temperature difference between main pipes of inlet and outlet of geothermal heat exchangers is measured as 3℃. The geothermal system COPs are calcluated as 2.92 ~ 3.92 in every 12 hours.
수직형 지열교환기의 입ㆍ출구온도에 대한 실측과 CFD 결과 비교
우상우(Sang-woo Woo),김중헌(Joong-hun Kim),신승호(Seung-ho Shin),황광일(Kwang-il Hwang) 한국지열·수열에너지학회 2007 한국지열에너지학회논문집 Vol.3 No.1
The purpose of this study is to use the CFD(Computational Fluid Dynamics) method for the ground source heat pump(GSHP) system with vertical U-tube ground heat exchangers. In order to predict LWT(leaving water temperature) in the length of time, This simulation is used by utilizing FLUENT which is commercial CFD code. It was performed by based on four boreholes in the field. Comparing with the results of CFD and field measurement for LWT, the results of CFD was presented very good agreement with 1.0% average difference.
지열원 히트펌프를 이용한 도로융설시스템의 CFD 성능예측에 관한 기초연구
최덕인(Duk-In Choi),김중헌(Joong-Hun Kim),김진호(Jin-Ho Kim),황광일(Kwang-Il Hwang) 한국지열·수열에너지학회 2010 한국지열에너지학회논문집 Vol.6 No.2
Fluent ver.6.3 is used as CFD(Computational Fluid Dynamics) simulator to predict the performance of snow-melting system by geothermal pipes energy. As the results of this simulation, it is clearly shown that 50℃ of working fluid in to geothermal evaluated as more effect comparing to 45℃ of working fluid. The Surface temperature is come to 5℃ at 1㎧ speed and 50℃ temperature of the working fluid.
연구ㆍ사무용 건물에 적용된 수직형 지열 냉난방시스템의 계절별 성능평가
황광일(Hwang Kwang-Il),김중헌(Kim Joong-Hun),신승호(Shin Seung-Ho) 대한건축학회 2009 대한건축학회논문집 Vol.25 No.7
A geothermal heat pump system of 400RT cooling capacity has been measured and evaluated 3 times through a year. Followings are the results. The inlet temperature into the GHEX(Geothermal Heat EXchanger) is lower than outlet in winter, but in summer it reversed. Even the average heat conductivity is evaluated as 3.09W/m℃, because of the heat conductivity differences between borehole #2 and #1(#2 is higher than #1), the temperature differences between inlet and outlet of GHEX of heat pump zone #2 is measured higher than zone #1. The maximum temperature of the 1st winter was 15℃, but it was increased to 17.5℃ at next winter, one of the major reason is assumed that the exhausted heat might be spread less effectively and accumulated into the ground during cooling operation in summer. The geothermal system COP was calculated as 4.3 at 1st-winter measurement, 3.8 at 2nd-summer measurement, and 3.4 at 3rd-winter measurement. The newly proposed index on this paper, namely heating correction factor of geothermal system COP, is estimated as 0.82.
황광일(Kwang-il Hwang),우상우(Sang-woo Woo),김중헌(Joong-hun Kim),양기영(Gi-young Yang),신승호(Seung-ho Shin) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
The purpose of this study is on the performance evaluation of horizontally installed GHEX(Geothermal Heat EXchanger, HGHEX) which has been operated for 5 years successfully. Followings are the results. Firstly, in summer season, on Aug. 2000, 33℃ water was flowing out from HGHEX with continuous operating method, and 27~29℃ with interval operating method on Jul. 2005. But 2.5~3.0℃ temperature differences are gained from HGHEX. Secondly, in winter season, on Nov. 2000, 25℃ water was flowing out from HGHEX with continuous operating method, and 13~15℃ with interval operating method on Jan. 2006. But with each operating method, only 0.1℃ and 0.7℃ temperature differences are gained from HGHEX respectively. As the conclusion of this study, at the point of continuos operating method, seasonal balance of heating and cooling loads, and at the point of interval operating method, balance for geothermal restoring time respectively must be considered for better system performances.
초등학교 영어 교수․학습활동에 대응한 학습공간 구축에 관한 연구
최병관(Choi, Byung-Kwan),오형석(Oh, Hyoung-Seok),김중헌(Kim, Joong-Hun) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.7
본 연구는 각 학교급별 영어교육 내용 및 방법에 적합한 영어 교육 환경을 조성하기 위해서 영어 전용교실 의 공간구성 및 운영방안에 대한 건축 계획적 방안 모색과 그 지침을 구하는 것이 목적이다. 이 연구의 목적을 달성 하기 위하여 다음과 같이 연구를 진행하였다. 첫째, 전국 초등학교의 영어교육환경을 파악하기 위한 설문조사표를 작성하여 전국 초등학교를 대상으로 영어교육과 관련한 실 종류와 보유 현황, 그리고 각 실들의 면적 등의 시설 현황에 조사∙분석하였다. 둘째, 학교급별 영어 교육과 정 및 교육내용․방법에 대한 분석을 실시하여 영어 교육을 수행하기 위한 학교급별 대표적인 학습장면과 그에 따른 시설 및 설비 환경을 추출하였다. 셋째, 이를 통하여 학교급별, 규모별 영어교육환경 조성을 위한 영어 전용교실의 공 간구성 요건 및 운영방안을 모색하고 건축 계획적 지침을 제안 하였다. 본 연구를 통해 초등학교의 영어교육 내용 및 방법에 적합한 영어 교육 환경을 조성하기 위해서 영어 전용 교실의 공간구성 및 운영 방안에 대한 건축 계획적 방안 모색과 그 지침을 구하고자 한다. This study focuses the architectural planning solution and guiding principle for English only classroom spatial layout and operation program to establish English educational environment proper to English curriculum contents and methodology by the grade level of elementary school. To accomplish this purpose of the study, this study proceeds as follows. First, the English facility condition such as type of classroom, retainment and floor space were researched and analyzed through the nationwide survey for elementary schools to understand English educational environment. Second, the study analyzes English educational procedures, contents and methodology and most typical educational scenes, facilities and equipments are extracted through the analysis. Finally, the study pursues the spatial layout factors and proposes the architectural planning principle for English only classroom to provide English educational environment per its size and type.
계절별 운전조건에 따른 수직형 지열교환기의 깊이별 지중온도 변화에 대한 사례 연구
황광일(Hwang Kwang-Il),신동걸(Shin Dong-Keol),김중헌(Kim Joong-Hun),신승호(Shin Seung-Ho) 한국태양에너지학회 2009 한국태양에너지학회 논문집 Vol.29 No.3
To estimate the operating performances of the geothermal heat exchange pipc(GHEX), GHEXs of 400RT geothermal system were measured and analyzed through a year. The followings are the results. The temperature of 2 GHEXs installed 4m apart was fluctuated very similarly. When the geothermal system is not operating or is operating as heating mode, the temperature of G.L.-170m was always higher than G.L.-70m's. But it reversed when the geothermal system is operating as cooling mode. And through a year, it has been observed that the temperature of G.L.-170m is increased approximately 1.5℃. With previously mentioned results, the heat transfer capacity of G.L.-70m's geological stratum is estimated as higher than that of the G.L.-170m.