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진천 친환경에너지타운의 냉방기간 실증운전결과 및 에너지자립도 분석
김득원(Kim, Deuk-Won),이동원(Lee, Dong-Won),허재혁(Heo, Jae-Hyeok),김민휘(Kim, Min-Hwi) 한국건축친환경설비학회 2018 한국건축친환경설비학회 논문집 Vol.12 No.3
In this study, the empirical results of solar thermal system and photovoltaic system in Jincheon eco-friendly energy town were carried out. In the town, electricity and thermal energy are self-produced and supplied to six types of building (high school, library, management center, public health center, child care center, youth center). The measurement period of the data was cooling season, Jun. 1st to Oct. 16th. The photovoltaic system produced 361 MWh electricity, and the buildings consumed 247 MWh electricity in the season. The plus energy rate of each month was calculated to 103%~208%. In case of thermal energy, the thermal energy is saved in a seasonal thermal energy storage (TES) and a midnight thermal energy storage. The thermal energy saved in the seasonal TES is used of hot water and heating, and the thermal energy saved in midnight TES is used of cooling. The energy saved in seasonal TES supply hot water to the buildings about 38 MWh, and the energy saved in midnight TES supply cooling heat to the buildings about 101 MWh in cooling season. By the results of measurement, the renewable generation facilities can cover the demand of electricity and thermal energy in Jincheon eco-friendly energy town.
복수의 열에너지 프로슈머가 존재하는 열 네트워크에서의 양방향 열공급 실증운전 결과
김민휘(Min-Hwi Kim),김득원(Deuk-won Kim),이동원(Dong-Won Lee),허재혁(Jaehyoek Heo) 대한설비공학회 2021 설비공학 논문집 Vol.33 No.9
In this study, a small-scale thermal network with multiple thermal energy prosumers was configured and a bi-directional heat supply operation for thermal energy sharing or heat trading was experimentally investigated. The conventional centralized thermal network was remodeled to bi-directional thermal network and two buildings, among the seven buildings, were retrofitted to the heat prosumer buildings. The heat prosumer buildings, including an absorption heat pump system and a geothermal heat pump system, were connected to four buildings devoid of heat production facility under the cooling and heating and hot water supply thermal network. Through this research work, it was proved that the bi-directional heat supply could be performed during five weeks cooling and heating operation in summer and winter. It was also found that the proposed bi-directional heat supply network construction method could be used to implement heat transactions between buildings on a heat network with multiple heat energy prosumers.
김민휘(Min-Hwi Kim),이동원(Dong-Won Lee),김득원(Deuk-won Kim),허재혁(Jaehyoek Heo) 대한설비공학회 2021 설비공학 논문집 Vol.33 No.1
In this study, the existing small-scale centralized-district cooling and heating system was retrofitted to form a small-scale heat network with two thermal-energy prosumers, and we empirically analyzed the feasibility of this bi-directional thermal network. In the experimental test, we identified the operation status of a small-scale thermal network based on existing solar thermal and geothermal heat pumps and modified it to form a bi-directional thermal-network system. The bi-directional heat supply was created by calibrating two thermal-energy prosumers to supply heat at predetermined times and converting the absorption heat pump in another building into another thermal prosumer. This experiment confirmed that bi-directional thermal transfer can be accomplished in a thermal network as well as in the conventional heat-supply method. The results of these empirical experiments also showed that the use of bi-directional thermal networks in heat transactions is economically feasibility and eco-friendly.
이송섭(Lee Song Seop),이왕제(Lee Wang Je),김득원(Kim Deuk Won),이경호(Lee Kyung Ho),김지현(Kim Ji Hyeon),신우철(Shin U Cheul) 한국태양에너지학회 2024 한국태양에너지학회 논문집 Vol.44 No.1
Conventionally, solar thermal systems in South Korea have primarily focused on domestic hot water supply and partial space heating. However, with the recent expansion of applications to include industrial process heat and space heating in greenhouses with seasonal heat storage, there is an increasing requirement for developing highly efficient solar collectors that can operate effectively throughout the year. A solar thermal collector absorbs incoming solar radiation, converts it into thermal energy, and then transfers the energy to a heat-transfer fluid. The entire process should be optimized to minimize energy loss and ensure economic efficiency. A flat plate collector with single glazing is highly efficient at low temperatures and high solar intensities, whereas an evacuated tube collector is relatively efficient at high temperatures and low solar intensities. Therefore, in this study, we proposed a flat plate collector with double glazing that exhibited excellent thermal performance under all operating conditions. We validated the thermal performance through theoretical analysis and empirical experiments. In the theoretical analysis, we presented an analytical model for the comprehensive modeling of the flat plate collector and examined its thermal performance based on key design parameters, such as solar transmittance, emissivity, and gas fill. The thermal performance was confirmed, and an optimal design solution was derived. Furthermore, to validate the accuracy of our analysis, we conducted thermal performance testing on an optimized flat plate collector with double glazing, according to the specifications outlined in KS B 8295. The results showed a correlation between the simulation and experimental results.