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밀폐형과 개방형이 결합된 복합지열시스템의 지중열교환기 성능 분석
박영윤,송재용,이근춘,김기준,목종구,박유철,Park, Youngyun,Song, Jae-Yong,Lee, Geun-Chun,Kim, Ki-Joon,Mok, Jong-Koo,Park, Yu-Chul 한국지하수토양환경학회 2017 지하수토양환경 Vol.22 No.5
This study was conducted to evaluate performance of geothermal heat exchanger (GHE) in the combined well and open-closed loops geothermal (CWG) systems. The CWG systems were designed to combine open loop geothermal heat pumps and closed loop geothermal heat pumps for high energy efficiency. GHE of the CWG systems could be installed at pumping wells for agricultural usage. To get optimal heat exchange capacity of GHE of the CWG systems, 4 GHEs with various materials and apertures were tested at laboratory scale. Polyethylene (PE) and stainless steel (STS) were selected as GHE materials. The maximum heat exchange capacity of GHEs were estimated to be in the range of 33.0~104 kcal/min. The heat exchange capacity of STS GHEs was 2.4~3.2 times higher than that of PE GHE. The optimal cross section area of GHE and flow rate of circulating water of GHE were estimated to be $2,500mm^2$ and 113 L/min, respectively. For more complicated GHE of the CWG systems, it is necessary to evaluate GHEs at various scales.
안정동위원소 조성을 이용한 TCE 오염원 규명방법 소개
박영윤,이진용,나원종,김락현,최필성,전성천,Park, Youngyun,Lee, Jin-Yong,Na, Won Jong,Kim, Rak-Hyeon,Choi, Pil Sung,Jun, Seong-Chun 한국지하수토양환경학회 2013 지하수토양환경 Vol.18 No.3
This study was performed to summarize application of ${\delta}^{13}C$, ${\delta}^{37}Cl$ and ${\delta}D$ of trichloroethylene (TCE) to studies on environmental forensic field regarding identification of TCE sources and evaluation of contribution of TCE to groundwater using data collected from literatures. ${\delta}^{13}C$, ${\delta}^{37}Cl$ and ${\delta}D$ of TCE give some information regarding sources of TCE because they show specific value according to manufacturing method. Also, TCE do not show a significant isotopic fractionation owing to adsorption and dilution. The isotopic fractionation mainly occurs by biodegradation. In addition, isotopic fractionation factor for TCE is different according to a kind of microorganism participated in biodegradation. However, the isotopic data of TCE have to be applied with chemical compositions of TCE and other hydrogeologic factors because isotopic fractionation of TCE is influenced by various factors.