• Research Article

    On Meteorological Data Characteristics Including Solar Insolation for Domestic 6 Regions

    국내 6개 지역 중심으로 분석한 일사량을 포함한 기상 데이터 특성

    Jeongbae Kim

    김정배

    Research on a policy to expand the measurement locations of meteorological data nationwide is underway; further, various attempts to improve measurement accuracy … + READ MORE
    Research on a policy to expand the measurement locations of meteorological data nationwide is underway; further, various attempts to improve measurement accuracy have been made. This study quantitatively compared and analyzed the changes in meteorological data for six regions, including Corner 4 (Incheon, Gangneung, Mokpo, and Busan), Daejeon (central location), and Seoul (selected as symbolic representative locations). The results provided details of solar insolation, dry-bulb temperature, relative humidity, wind speed, cloud cover, and duration of sunshine. - COLLAPSE
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    30 October 2023

  • Research Article

    A Study on the Effect of Various Initiators of Acrylic Binder for Low-Temperature Curing Silver Paste

    저온 경화 은 페이스트 용 아크릴계 바인더의 다양한 개시제의 영향에 관한 연구

    Jiyeon Moon, Hyunsoo Lim, Godeung Park, Hyeryeong Nam, Da Yeong Jun, Zulmandakh Otgongerel, Oryeon Kwon, Sung Hyun Kim

    문지연, 임현수, 박고등, 남혜령, 전다영, OtgongerelZulmandakh, 권오련, 김성현

    In heterojunction (HJT) solar cells, an amorphous silicon passivation layer is attached to the top and bottom of a crystalline silicon layer. … + READ MORE
    In heterojunction (HJT) solar cells, an amorphous silicon passivation layer is attached to the top and bottom of a crystalline silicon layer. HJT solar cells are manufactured at approximately 200°C because the structure of amorphous Si:H changes at high temperatures. Therefore, the silver paste utilized as an electrode on HJT solar cells should be subsequently cured at low temperatures below 200°C. In addition, the electrode requires good conductivity even at low curing temperatures. An initiator in the binder is crucial for the production of silver paste capable of low-temperature curing. This study investigated the effects of various initiators on the characteristics of a binder and silver paste that can be cured at low temperatures. Differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA) were operated to investigate the initiation and thermal decomposition properties of binders. The relationship between gel contents and the electrical conductivity of cured pastes was explored to reveal the impact of the curing ratio on electrical conductivity. The appropriate utilization of the initiator resulted in a high curing rate, which in turn increased the electrical conductivity. - COLLAPSE
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    30 October 2023

  • Research Article

    Development of a Methodology to Evaluate the Impact of East-West Facing Photovoltaic Systems on Power System Operation

    동서향으로 배치된 태양광발전시스템이 전력계통의 운용에 미치는 영향 평가 방법론 개발

    Yong-Ha Kim, Gyu-Rim Han, Hye-Seon Lee, Yu-ri Kim

    김용하, 한규림, 이혜선, 김유리

    This study analyzed the effect of the east-west facing photovoltaic power generation system on the power system, expressed it as a quantitative … + READ MORE
    This study analyzed the effect of the east-west facing photovoltaic power generation system on the power system, expressed it as a quantitative indicator, and presented a calculation method through optimal power flow. In addition, we developed an algorithm that can quantitatively evaluate the effect of the east-west facing photovoltaic power generation system on the power system by monetizing the quantitative indicators and calculating the benefits of the east-west facing photovoltaic power generation system. - COLLAPSE
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    30 October 2023

  • Research Article

    A Study on the Determination of Subjects for Post-Management Investigation Using the Monitoring Results of Self-Consumption Solar Power

    자가용 태양광설비 발전 이용률 모니터링 결과를 활용한 사후관리 조사대상 결정에 대한 연구

    Keon-Woo Lee, Chang-Dae Park, Young-Seop Lee, Sung-Woo Park

    이건우, 박창대, 이영섭, 박성우

    The global trend of renewable energy generation and the advent of the Internet of Things technology has popularized inexpensive integrated monitoring technology. … + READ MORE
    The global trend of renewable energy generation and the advent of the Internet of Things technology has popularized inexpensive integrated monitoring technology. Accordingly, the Renewable Energy Monitoring System (REMS) project, which monitors solar plants subsidized by National funds, has been expanding its target since 2018. Concurrently, the mandatory post-management system became effective in 2020 to strengthen the post-management system. The 3-sigma rule is used to determine the control chart for the normal operation of solar systems from the monitoring data. In this study, solar plants with normal operation within the control chart were suggested to be excluded from field investigation with a focus on the management of solar plants with abnormal operation outside the control chart to improve the overall investigation into inefficiencies in the mandatory post-management system. Improvements to the monitoring system operation plan were also suggested. - COLLAPSE
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    30 October 2023

  • Research Article

    Performance Evaluation of LSTM Based Solar Irradiance Prediction Models without Long-term Local Weather Data

    누적 데이터 부족 시 활용 가능한 로컬 일사 예측 모델 개발 및 평가

    Byung-ki Jeon, Eui-Jong Kim

    전병기, 김의종

    Prediction of solar irradiance that influences the building load and production of new and renewable energy is crucial in the predictive control … + READ MORE
    Prediction of solar irradiance that influences the building load and production of new and renewable energy is crucial in the predictive control of buildings. However, most solar irradiance prediction models are developed using weather data measured over a long term in the target region. This study proposed a solar irradiance prediction model based on a hybrid layer that combined a long short-term memory layer and a bi-directional long short-term memory layer. Next, the solar irradiance of the following day was predicted using only the hourly irradiance measured on site one day before the prediction day using a model trained with the weather data of another region. The proposed solar irradiance prediction model showed an RMSE of 69.5 W/m2, a level suitable for the predictive control of buildings. Moreover, although training data from a different region was used, the performance of the proposed model was similar to that of a model trained with long-term data measured in the target region. - COLLAPSE
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    30 October 2023

  • Research Article

    Research on the Appropriate Rent for Solar Power Plant Investment on Public Land of Local Government

    지방자치단체 공유지의 태양광 발전사업 투자 유치를 위한 적정 임대료 연구

    Heehwan Kang, Hojoong Lee, Yuseon Lee, Bora Na

    강희환, 이호중, 이유선, 나보라

    In this study, we analyzed the investment returns of solar power plants and compared them with those of commercial real estate. The … + READ MORE
    In this study, we analyzed the investment returns of solar power plants and compared them with those of commercial real estate. The analysis revealed that solar power plant operators should aim for a 10.72% minimum rate of return. In the Paju area of the Republic of Korea, the rent was confirmed to be 35,984 won/kW annually for building-based solar power plants and 25,488 won/kW annually for ground-based solar power plants to achieve this rate of return. According to our results, if local governments focus on developing solar power plants by leasing public land, they could set reasonable rents that satisfy both the local government and solar power plant operators. - COLLAPSE
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    30 October 2023

  • Research Article

    Analysis of Changes in U-values of Windows According to Changes in Argon Gas Filling Rates- Focusing on Energy-saving Design Standards for Buildings

    아르곤 가스 충진율 변화에 따른 창호의 열관류율 변화 분석 기초 연구 – 건축물의 에너지절약설계기준을 중심으로

    Kyung-Joo Cho, Bo-Kyoung Koo, Dong-Woo Cho

    조경주, 구보경, 조동우

    In this study, we examined the effect of argon gas leakage on the insulation performance of high-performance windows filled with argon gas … + READ MORE
    In this study, we examined the effect of argon gas leakage on the insulation performance of high-performance windows filled with argon gas according to energy-saving design standards for buildings. Field surveys, insulation tests per KS F 2278 at various argon gas-filling rates, and WINDOW 7.8 simulations yielded the following main results. First, we found an average gas-filling rate of 49.9% in insulating glass for buildings constructed after the 2018 revision of the building energy code in the scope of this study. A strong correlation was found between completion years and argon gas-filling rates. Second, the insulation performance test per KS F 2278 indicated that decreasing argon gas-filling rates from 95% to 0% resulted in a 10.9% decrease in insulation for low-E double-glazed windows and a 28.8% decrease for low-E triple-glazed windows. Third, for window specifications from the building energy code, WINDOW 7.8 simulations showed an average insulation performance decrease of 11.6% for low-E double-glazed windows and decrease of 15.8% for low-E triple-glazed windows when the argon gas-filling rate was decreased from 95% to 0%. This supports the KS F 2278 test results, with the simulation indicating a greater decrement in insulation performance for triple-glazed windows. - COLLAPSE
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    30 October 2023
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