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양방향 열거래를 위한 허브축열시스템의 냉/난방기간 실증운영결과 분석
김득원(Deukwon Kim),이동원(Dongwon Lee),김민휘(Minhwi Kim),허재혁(Jaehyeok Heo),허준(Joon Heo),민경천(Kyoungchon Min) 대한설비공학회 2024 설비공학논문집 Vol.36 No.6
The imperative of climate change calls for carbon reduction throughout diverse sectors, and within the HVAC industry, leveraging renewable energy emerges as a pivotal strategy for carbon mitigation. The heat pump(HP) system stands out as an advanced technology for the efficient exploitation of renewable energy, having attained significant technological sophistication and being adopted for a wide range of applications. This investigation embarked on empirical research aimed at augmenting the effective deployment of HP systems, with a special emphasis on the heat pump integrated with thermal energy storage (HP-TES). A novel hub thermal energy storage(hub TES) framework, facilitating bidirectional heat exchange and optimizing the use of the HP system, was developed and empirically assessed. Employing a hub TES system of 400-ton capacity situated in Busan Myeongji International City resulted in operational cost savings of approximately 18.5% when juxtaposed with conventional central heating supply systems. The introduction of the hub TES system, underpinning bidirectional heat trading, effectively mitigated the fluctuating nature of renewable energy sources by catering to diverse thermal demands. Furthermore, the study verified the dual benefits of enhanced heat supply stability and reduced operational costs through the communal utilization of thermal infrastructure.
증기 이젝터 위치에 따른 다중효용증발시스템의 설계 및 성능분석
김득원(Deukwon Kim),최상민(Sangmin Choi) 대한설비공학회 2016 설비공학 논문집 Vol.28 No.11
The evaporation of water from an aqueous solution is widely used in the food, desalination, pulp, and chemical industries. Usually, a large amount of energy is consumed in the evaporation process to boil off water due to atmospheric pressure. As a way of improving the energy efficiency of the evaporation process, the combination of multiple effect evaporation and thermal vapor recompression has been proposed and has become a successful technique. In this study, 4 multiple-effect falling film type evaporators for sugar solution are designed and the energy efficiency of the system is analyzed in response to the selection of the steam ejector position. Energy efficiency is increased and vapor is more compressed in the steam ejector as the Thermal Vapor Recompression (TVR) is arranged in the rear part of the evaporator system. A simplified 0-dimensional evaporator model is developed using non-linear equations derived from mass balances, energy balances, and heat transfer equations. Steam economy is calculated to compare the evaporation performance of the 4 proposed evaporators. The entrainment ratio, compression ratio, and expansion ratio are computed to check the ejector performance.
친환경에너지타운 내 신재생열에너지 시스템 운영결과 분석
김득원(Kim Deukwon),허재혁(Heo Jaehyuk),김민휘(Kim Minwhi),이동원(Lee Dongwon) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.2
The eco-friendly energy town of Jincheon is Korea’s first renewable energy-based energy self-sufficient town that utilizes multiple renewable energy sources, such as PV, solar thermal, geothermal, and sewage heat to achieve power and thermal energy independence in the unit region. In this study, the thermal energy system of Jincheon, which has been operating since 2017, was analyzed. The thermal energy system consists of a seasonal thermal energy storage connected to approximately 1,600 ㎡ of solar thermal collectors and a midnight thermal energy storage connected to approximately 150 RT heat pumps. Based on data from 2017 to 2020, the heat supply status, expected profits, and greenhouse gas reduction effects of the thermal energy system were analyzed. During the target period, 483 MWh of heating heat, 167 MWh of hot water, and 113 MWh of cooling heat were supplied on an annual average for the last three years. These findings confirmed expected profits of 95.6 million won/yr for hot heat and 1.3 million won/yr for cold heat. In addition, the renewable heat supply resulted in reduction of 156.7 tons of CO₂ eq./yr greenhouse gas.
친환경에너지타운 내 850 kW급 태양광발전시스템 운영결과 분석
김득원(Kim Deukwon),허재혁(Heo Jaehyuk),김민휘(Kim Minwhi),이동원(Lee Dongwon) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.2
Global climate change demands a change in the social infrastructure, and the transformation of the energy system is indispensable to global trends. Jincheon, an eco-friendly energy town located in the innovative city of Chungbuk, is the first renewable energy-based town in Korea. Renewable energy sources, such as photovoltaic, solar thermal, geothermal, and sewage heat are combined to achieve energy sufficiency in the unit area. In this study, the operational results of an 850 kW photovoltaic system, among the renewable energy systems in Jincheon, were analyzed. Based on the operating data from 2018 to 2020, the capacity factor, generation benefit, and CO₂ reduction effect were studied. The capacity factor was 14.5%/yr, the generation benefit was 200.6 million won/yr, and the CO₂ reduction was 494.7 tons of CO₂ eq./yr. Through this study, it was confirmed that Jincheon could serve as a representative example of an eco-friendly energy town during this time of transition of the new energy system.