• Research Article

    The Fundamental Researches to Evaluate PVT Module Performance

    PVT 모듈 성능 평가를 위한 기초 연구

    Pilkyu Kim

    김필규

    PVT modules commonly can be defined as a combination of PV modules and thermal collectors. After absorbing sun light, electricity and hot ... + READ MORE
    PVT modules commonly can be defined as a combination of PV modules and thermal collectors. After absorbing sun light, electricity and hot water can be actually provided to users simultaneously, which dual outputs (electricity and hot water) have drawn academic interest and industrial activities. Additionally, heat exchange between solar cell and flowing water can enhance solar cell efficiency. Because of PVT modules effectiveness, new international markets and commercial products have made. Especially European, facilities and measurement methods are established to evaluate PVT module performance. However, there are no currently appropriate internationally and domestic standards and facilities to test PVT module performance Herein, to test PVT module performance, indoor thermal simulators and fundamental standard study are considered. - COLLAPSE
    August 2018
  • Research Article

    Photovoltaic System Energy Performance Analysis Using Meteorological Monitoring Data

    기상 환경 모니터링 데이터를 이용한 태양광발전시스템 발전량 성능 분석

    Kwon Oh-Hyun, Lee Kyung-Soo

    권오현, 이경수

    Nowadays, domestic photovoltaic system market has been expanded and the governmental dissemination policy has been continued. There is only PV system output ... + READ MORE
    Nowadays, domestic photovoltaic system market has been expanded and the governmental dissemination policy has been continued. There is only PV system output performance analysis which is called Performance Ratio(PR) analysis. However, there exists many parameters that can affect PV system output. This papers shows the PV system energy performance analysis using meteorological monitoring data. The meteorological monitoring system was installed in the H university and we analyzed the PV system which installed in the H university. We also investigated other three PV systems which located less than 3 kilometers from H university. We evaluated total 4 PV systems through the field survey data, design drawing data and power generation data. Finally, we compared the actual measuring data with the simulation data using PVSYST software. - COLLAPSE
    August 2018
  • Research Article

    A Study on the Wiring Plan Considering Construction and Frame Performance Degradation of BIPV System

    BIPV시스템 시공 및 프레임 성능저하를 고려한 배선처리방안 제시에 관한 연구

    Oh Min-Seok, Kim Gi-Cheol

    오민석, 김기철

    In the application of the BIPV system, it is expected that the workability is lowered due to the difficulty in securing the ... + READ MORE
    In the application of the BIPV system, it is expected that the workability is lowered due to the difficulty in securing the space for wiring in the frame and the performance of the frame due to the wiring hole processing is lowered. Therefore, In this study, we propose a method to improve the wiring of the inner space of the BIPV frame, and through the simulation evaluation process, the thermal and condensation performance are secured by complementing the problems caused by the hole machining, and the time and effort required for BIPV construction are reduced. For this purpose, a wiring treatment method using a flange insertion tube was proposed, and the thermal and condensation performance was evaluated through simulation analysis. - COLLAPSE
    August 2018
  • Research Article

    Case Study : Assessment of Small Hydropower Potential Using Runoff Measurements

    관측 유량 자료를 이용한 소수력 잠재량 평가에 대한 사례연구

    Jung Sung-Eun, Kim Jin-Young, Kang Yong-Heack, Kim Hung-Su

    정성은, 김진영, 강용혁, 김형수

    In this study, we assessed dependency of small hydropower potentials on the two different runoff such as the estimated runoff based on ... + READ MORE
    In this study, we assessed dependency of small hydropower potentials on the two different runoff such as the estimated runoff based on the rainfall amounts and measured runoff. The hydpropower potentials were evaluated using actural power generations taken from Deoksong, Hanseok, and Socheon small hydropower plants over Han and Nakdong river basins, respectively. As a result of comparing the actual power generation amount with the potential amount based on the rainfall amount and the estimated amount based on the observed flow amount by each small hydroelectric power plant, the degree of latent small hydro energy by the observed flow was confirmed to be high. It is confirmed that the potential hydroelectric power generation rate is estimated to be about average 30%Point higher than the actual generation amount as a result of the measured flow rate rather than using the rainfall amount. Based on this, a method for improving the degree of the actual generation amount is proposed. - COLLAPSE
    August 2018
  • Research Article

    A Study of Load Matching on the Net-Zero Energy House

    넷 제로에너지주택의 부하매칭에 관한 연구

    Kim Beob-Jeon, Lim Hee-Won, Kim Deok-Sung, Shin U-Cheul

    김법전, 임희원, 김덕성, 신우철

    nZEH (net-Zero Energy House) is defined as a self-sufficient energy building where the sum of energy output generated from new & renewable ... + READ MORE
    nZEH (net-Zero Energy House) is defined as a self-sufficient energy building where the sum of energy output generated from new & renewable energy system and annual energy consumption is zero. The electricity generated by new & renewable energy system with the form of distributed generation is preferentially supplied to electrical demand, and surplus electricity is transmitted back to grid. Due to the recent expansion of houses with photovoltaic system and the nZEH mandatory by 2025, the rapid increase of distributed generation is expected. Which means, we must prepare for an electricity-power accident and stable electricity supply. Also electricity charges have to be reduce and the grid-connected should be operated efficiently. The introduction of ESS is suggested as a solution, so the analysis of the load matching and grid interaction is required to optimize ESS design. This study analyzed the load matching and grid interaction by expected consumption behavior using actual data measured in one-minute intervals. The experiment was conducted in three nZEH with photovoltaic system, called all-electric houses. LCF (Load Cover Factor), SCF (Supply Cover Factor) and fgrid (Grid Interaction Index) were evaluated as an analysis indicator. As a result, LCF, SCF and fgrid of A house were 0.25, 0.23 and 0.27 respectively; That of B house were 0.23, 0.23, 0.19, and that of C were 0.20, 0.19, 0.27 respectively. - COLLAPSE
    August 2018
  • Research Article

    A Study on the Natural Cooling Effect by Ventilation Control Mode of Window at School Classroom

    학교 교실의 창호 환기 조절 모드에 따른 자연형 냉방효과 연구

    Lee Hyo-Seok, Kim Soon-Ho, Choi Jeong-Min

    이효석, 김순호, 최정민

    Cooling the building by natural ventilation is one of the passive methods widely used from ancient times. It can be effectively applied ... + READ MORE
    Cooling the building by natural ventilation is one of the passive methods widely used from ancient times. It can be effectively applied especially in case of cooling load during the intermediate season of the year. In this study, the effect of 4 cases of window ventilation control mode which are ‘Always Close’, ‘Temperature’, ‘Enthalpy’ and ‘Always Open’ is simulated by Energyplus program and analyzed to improve the comfort of occupants and reduce energy consumption of the school classroom. - COLLAPSE
    August 2018