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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.
원예시설 태양열 및 계간축열기반 신재생 융복합시스템 분석
김득원(Deukwon Kim),김민휘(Min-Hwi Kim),이동원(Dong-Won Lee),허재혁(Jaehyeok Heo) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
In this study, the energy performance of the seasonal thermal energy storage and solar thermal system based renewable energy convergence system was investigated. The proposed renewable energy convergence system was consisted of the solar thermal (ST) system, photovoltaic and solar thermal (PVT) system, tank type seasonal thermal energy storage (TTES), borehole type seasonal thermal energy storage (BTES), and hybrid heat pump systems. The flat-plate type ST panel is integrated with TTES and the PVT is integrated on the BTES. The hybrid heat pump uses either air-source or water-source. The water-sources are the heat of TTES, BTES, or geothermal to produce the heating water for greenhouse. The energy performance of the proposed system was analyzed by TRNSYS software. The test site of greenhouse has 3,942 ㎡ of total area and the proposed system serves cooling and heating energy. It was found that the proposed system showed 10.0 % of direct solar fraction and 41.2 % of total solar fraction.
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.