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김권예(Kwonye Kim),이태하(Taeha Lee),김재민(Jamin Kim),배상무(Sangmu Bae),남유진(Yujin Nam) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
The most important challenge for the global energy sector is to rapidly transform the entire system to one less dependent on fossil fuels and so reduce the harmful effects on the climate. So countries around the world are actively introducing renewable energy systems. Among them, a ground source heat pump is a high-performance technology used for maintaining a stable underground temperature all year-around. Nevertheless, the high costs for installation, such as boring and drilling, make the spread difficult. This study proposes a modular ground heat exchanger (GHX) that can compensate for the disadvantages (such as a high-boring/drilling costs) of the conventional vertical closed-loop GHX. Through a real-scale experiment, the comparison of heat exchange rate between modular GHX and vertical closed-loop GHX was analysed. During 48 hours, the average heat exchange rate of modular GHX and vertical GHX is 4633W and 5676W, respectively. During 25 days, the average heat exchange rate of modular GHX and vertical GHX is 2866W and 3782W, respectively.
표준부하모델을 이용한 설계 변수에 따른 표준부하량 분석
김권예(Kwonye Kim),배상무(Sangmu Bae),남유진(Yujin Nam) 한국지열·수열에너지학회 2021 한국지열에너지학회논문집 Vol.17 No.1
Before newly-built building and building remodeling, it is important to predict and analyze building energy performance through energy simulation programs. Nevertheless, simulation results widely vary depending on individual user experience and input values. Therefore, this study uses prototypical building model, a versatile tool in building energy modeling, simulation and research for researchers and policy-makers, and ASHRAE standards. Then, it analyzed the changes in design type (roof type, number of floors) for the base case. As the result, it was found that the gap of annual energy demand per between them is maximally 9.1%.
동적 에너지 시뮬레이션에 기반한 지열원 및 공기열원 냉난방 시스템의 탄소배출량 분석
강연주(Yeonju Kang),채호병(Hobyung Chae),배상무(Sangmu Bae),김권예(Kwonye Kim),남유진(Yujin Nam) 대한설비공학회 2023 설비공학 논문집 Vol.35 No.10
In this study, the performance of two renewable energy systems, ground source heat pump (GSHP) system and air source heat pump (ASHP) system, was analyzed through dynamic energy simulation, and carbon emissions were quantitatively calculated through a life cycle assessment method based on the simulation results. The carbon emissions of the energy systems were calculated by dividing the life cycle evaluation stage into four categories: production, construction, operation, and disposal, and the calculation of carbon emissions in the operation stage was based on the annual performance analysis of the dynamic energy simulation. For 1 year of operation, the GSHP system had 14% higher carbon emissions than the ASHP system, while for 20 years of operation, the ASHP system had 39% higher carbon emissions than the GSHP. Compared to the ASHP system, the GSHP system can reduce carbon emissions in the operating stage by 42% per year by securing higher COP, and within 2 years, the carbon amount in the entire process can be lower than in the ASHP system.