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수치 시뮬레이션을 이용한 수직밀폐형 지열시스템의 채열특성에 관한 연구
남유진(Nam Yu-Jin),오진환(Oh Jin-Hwan) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.2
Ground source heat pump system can achieve high efficiency of performance by utilizing annually constant underground temperature to provide heat source for space heating and cooling. Generally, the depth of constant-temperature zone under the ground depends on surface heat flux and soil properties. The deeper the ground heat exchanger is installed, the higher the heat exchange rate can be acquired. However, in order to optimally design the system, it is necessary to consider both the installation cost and the system performance. In this study, performance analysis of ground source heat pump system according to the depth has been conducted through the case study.
지반,지하수 조건을 고려한 지하수 이용 공조 시스템의 이용 수법에 관한 연구
남유진 ( Yu Jin Nam ),( Ryozo Ooka ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.4
Groundwater heat pump (GWHP) system has been expected to achieve the higher coefficient of performance (COP) and more energy-saving than the conventional air-source heat pump (ASHP) system. Its performance significantly depends on the characteristics of groundwater and the underground thermal properties. Furthermore, there is a large difference of COP in utilizing groundwater between as a heat resource and as a thermal storage medium. For properties of groundwater there is suitable utilizing system. However, many of GWHP systems have not been considered sufficiently such properties. This research describes optimization of G WHP system according to the properties of groundwater based on 3D numerical heat and water transport simulation.
지반ㆍ지하수 조건을 고려한 최적의 지하수 이용 공조 시스템 선정에 관한 연구
남유진(Yu-Jin Nam),오오카 료죠(Ooka Ryozo),황석호(Suck-Ho Hwang) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
Groundwater heat pump (GWHP) system has been expected to achieve the higher coefficient of performance (COP) and more energy-saving than the conventional air-source heat pump (ASHP) system. Its performance significantly depends on the characteristics of groundwater and the underground thermal properties. Furthermore, there is a large difference of COP in utilizing groundwater between as a heat resource and as a thermal storage medium. For properties of groundwater there is suitable utilizing system. However, many of GWHP systems have not been considered sufficiently such properties. This research describes optimization of GWHP system according to the properties of groundwater based on 3D numerical heat and water transport simulation.
태양열 및 지열 이용 히트펌프 시스템의 성능예측 시뮬레이션에 관한 연구
남유진(Nam Yu-Jin),까오신양(Gao Xin-Yang) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.3
Recently, the use of renewable energy has been attracted due to the interest in energy-saving and the reduction of CO2 emission. In order to reduce the energy consumption of the cooling and the heating in the field of the architectural engineering, heat pump systems using renewable energy have been developed and used in various applications. In many researches, integrated heat pump systems are suggested which use solar and geothermal heat as the heat source for cooling and heating. However, it is still difficult to predict the performance of the systems, because the characteristic of heat exchange in each system is complicated and various. In this system, the performance prediction simulation of the heat pump was developed using a dynamic simulation model. This paper describes the summary of the suggested systems and the result of the simulation. The average temperature of the heat source, heating loads and COP were calculated with the cases of different local conditions, different system composition and different operation time by TRNSYS 17.
대학생의 완벽주의적 자기제시와 사회불안의 관계: 대처방식의 중재효과
남유진(Yu Jin Nam),이봉건(Bong Keon Lee) 대한스트레스학회 2020 스트레스硏究 Vol.28 No.1
본 연구는 완벽주의적 자기제시와 사회불안의 관계를 살펴보고, 개인의 스트레스 대처방식에 따라 사회불안의 수준이 달라지는지를 알아보고자 하였다. 이를 위해 389명의 대학생을 대상으로 설문 조사를 실시한 결과, 사회불안, 완벽주의적 자기제시, 소극적 대처방식 간의 관계에서 모두 정적 상관을 보였다. 또한 소극적 대처방식을 많이 사용하는 경우에 완벽주의적 자기제시가 높은 집단이 낮은 집단에 비해 사회불안 수준이 높은 것을 확인하였다. 이를 통해 완벽주의적 자기제시 성향이 높은 사람들이 보이는 부적응적인 대처방식을 확인하고 이를 개선시켜 사회불안을 낮추기 위한 개입에 도움이 될 수 있을 것으로 기대된다. 마지막으로 본 연구의 임상적 의의 및 제한점에 대해 논의 하였다. Background: The purpose of this study was to investigate the relationships between perfectionistic self-presentation and social anxiety, how coping style moderated those factors. Methods: This study targeted 389 college students in chungcheongbuk-do province as research tools. Participants completed the Korean version of the Perfectionistic Self Presentation scale, Social Interaction Anxiety Scale, and Coping style Scale. That were analyzed by descriptive statistics, correlation, and hierarchical regression analysis using the SPSS 18.0 program. Results: The results showed that perfectionistic self-presentation, social anxiety, passive coping were positive association. And hierarchical regression analysis showed that, when passive coping was high, the high perfectionistic self-presentational group reported significantly higher social anxiety than the low perfectionistic self-presentational group. Conclusions: These results suggested the importance of perfectionistic self presentation and coping style in psychological approach to college students who have difficulty in social anxiety problems. And directions for future research were also discussed.
현장타설말뚝형 에너지 파일의 시공형태별 지중 열교환량에 관한 연구
박용부,남유진,심영종,손정락,Park, Yong-Boo,Nam, Yu-Jin,Sim, Young-Jong,Sohn, Jeong-Rak 한국토지주택공사 토지주택연구원 2012 LHI journal of land, housing, and urban affairs Vol.3 No.2
최근, 지열 냉난방 시스템의 초기 공사비를 절감하기 위해 연구되고 있는 에너지 파일의 열교환량을 산정하기 위해 2종류(부속연결형, 슬링키형)의 현장타설말뚝형(PRD, 시공심도 4.5m, 직경 1,200mm) 에너지 파일을 시험시공하고 수치 시뮬레이션에 의해 효율을 상호 비교하였다. 상호 비교결과에 의하면 지중 교환량은 운전시작과 함께 채열에 의한 지중온도의 저하에 의해 점점 감소하였고 부속연결형의 평균 열원수의 온도차는 난방운전에서 $0.37^{\circ}C$, 냉방운전에서 $0.34^{\circ}C$로 나타났다. 또, 부속연결형의 난방운전시 열교환량 231.4W/m보다 냉방운전의 방열량은 252.2W/m로서 9% 높았고 슬링키형은 난방 기간 평균 열교환량이 168.0W/m로 부속연결형에 비해 약 27% 낮은 열교환량을 얻었다. In recent, there are many studies associated with energy piles to save initial construction cost for ground source heat pump system. In this study, to evaluate geothermal exchange rates two types (a connection type and a slinky type) of cast-in-place energy piles (PRD, 4.5m in depth, 1,200 mm in diameter) were constructed for the tests and their efficiencies were compared with numerical analysis results. As a result, starting with operation, geothermal exchange rate gradually decreases due to exchange of lower ground temperature. In the case of connection type, temperature difference is $0.37^{\circ}C$ in heating mode and $0.34^{\circ}C$, in cooling mode, respectively. In addition, in case of a connection type, geothermal exchange rate in heating mode is 2,314W/m and in cooling mode, 252.2W/m whose value is 9% higher than in heating mode. In the case of slinky type, the average geothermal exchange rate in heating mode is 168.0W/m, which is about 27% lower than that of connection type.