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창면적비와 SHGC 범위에 따른 SPD를 적용한 반응형 스마트창호의 에너지 성능 평가
고유진(Yujin Ko),홍희기(Hiki Hong),민준기(Joonki Min) 대한설비공학회 2020 설비공학 논문집 Vol.32 No.9
Smart skin window controls the light transmittance in real time, equivalent to adjusting the window’s solar heat gain coefficient (SHGC). It would be ideal if the SHGC can be freely controlled between 0 and 1, but controllable SHGC range is limited by the specifications of the glass. Thus, in this study, the standard controllable SHGC range (0.11~0.35) was set, and first, the energy requirements of the model with the SPD windows compared to the general window models according to the window area ratio were analyzed. Additionally, based on the standard, the effect on the energy requirement was compared through the TRNSYS18 simulation program by expanding the range (0.11~0.45, 0.11~0.55) or increasing the minimum/maximum value (0.21~0.45, 0.31~0.55). As a result, since increasing the ratio of the heating energy and decreasing of the cooling energy increased as the window area ratio increases, the annual energy showed a decreasing ratio of up to 11.7% at a window area ratio of 70%. As a result of the simulation while expanding the range based on the standard, when the controllable range was the largest (0.11~0.55), the maximum decreasing ratio (16.7%) was shown with the window area ratio of 70%. As a result of simulation while simultaneously increasing the minimum/maximum value of standard range, when the window area ratio is 40% or less, the larger the minimum/maximum value, the greater the decreasing ratio. The smaller minimum/maximum value is more advantageous at 50% or more.
복합열원 히트펌프 최적 제어를 위한 열원에 따른 히트펌프 성능 및 에너지 소요량 패턴 비교
고유진(Yujin Ko),박시훈(Sihun Park),민준기(Joonki Min) 한국지열·수열에너지학회 2020 한국지열에너지학회논문집 Vol.16 No.4
The investment in the technology of using a combined heat source is insufficient, which utilizes the advantages of various heat sources to maximize the potential energy and at the same time increases the performance of the heat pump. In this study, as basic data for the development of a high-efficiency hybrid heat pump system that actively connects and uses various heat sources, simulations were conducted for the heat pumps in two cases where geothermal and hydrothermal heat were applied respectively. In May, COP increased by about 27.3% compared to geothermal heat. In February, the COP percentage decrease of hydrothermal heat compared to geothermal heat is –6.9%. In May, total energy consumption can be reduced by 21.1% when hydrothermal is applied compared to geothermal heat. In February, the total energy consumption increases by 3.4%.
열회수형 환기장치의 습도교환효율에 따른 동/하계 결로 발생률과 에너지회수율
고유진(Yujin Ko),장소미(Somi Jang),송두삼(Doosam Song),홍희기(Hiki Hong) 대한설비공학회 2020 설비공학 논문집 Vol.32 No.10
To resolve indoor air pollution such as CO₂ concentration problems that threaten the health of the occupants as well as to minimize the ventilation load that occupies a large portion of the cooling and heating loads, recently, the air-conditioning industry of cooling buildings including general houses has attracted much interest in Energy Recovery Ventilators (ERV). The commercially available ERV shows relatively good performance in general outdoor conditions, but condensation occurs inside the device from a humid climate in summer or a low temperature in winter, causing problems such as mold and rust. In this paper, the actual condensation occurrence ratio of South Korea was derived according to the latent effectiveness, and the outdoor conditions in which such condensation occurred were analyzed. As a result of summer simulation, the condensation occurrence ratio of Seoul/Busan was approximately 4.9%/12.9% at 0% latent effectiveness, and 0.7%/3.0% at 10%. In Seoul and Busan, condensation rarely occurs when the latent effectiveness is more than 20%. As a result of the winter simulation, the condensation occurrence rate of Seoul/Busan is approximately 84.9%/51.6% at the latent effectiveness of 0%. In the case of Seoul, as the latent effectiveness increases, the condensation occurrence rate slowly decreases, and then rapidly decreases from 30%. Condensation rarely occurs at 80% or more. In the case of Busan, it decreases linearly, and condensation rarely occurs at 70% or more.
습도교환효율에 따른 열회수형 환기장치의 결로발생률에 관한 연구
고유진(Yujin Ko),장소미(Somi Jang),홍희기(Hiki Hong) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
The commercially available Energy Recovery Ventilator(ERV) shows relatively good performance in general outdoor conditions, but condensation occurs inside the device due to a humid climate in summer or a low temperature in winter, causing problems such as mold and rust. In this paper, the actual condensation occurence rate of South Korea was derived according to the latent effectiveness As a result of summer simulation, the condensation occurence rate of Seoul/Busan was about 4.9%/12.9% at 0% latent effectiveness, and 0.7%/3.0% at 10%. As a result of winter simulation, the condensation occurence rate of Seoul/Busan is about 84.9%/51.6% at the latent effectiveness of 0% and condensation hardly occurs at 80% or more.
지열원 및 수열원 비율에 따른 복합열원 히트펌프시스템 성능 평가 연구
박시훈(Sihun Park),고유진(Yujin Ko),민준기(Joonki Min) 한국지열·수열에너지학회 2021 한국지열에너지학회논문집 Vol.17 No.2
In this study, combined heat source heat pump system was implemented with 4 single heat source heat pumps each applied with a geothermal source and a water source. Five cases (Case1~Case5) were configured to conduct a performance comparison and analysis of the combined heat source heat pump system. First of all, as a result of analyzing the heat source, the case when 4 ground heat sources were applied (Case1) showed a uniform EST(Entering Source Temperature) distribution throughout the year since it is less affected by outside air compared to the case when 4 water heat sources were applied (Case5). In both winter and summer, the ground heat source maintained higher EST than the water heat source. Therefore, the system with high ratio of geothermal sources is advantageous for heating, and with high ratio of water heat sources is advantageous for cooling.