• Research Article

    A Study on Estimation of Particle Penetration Load and Indoor Generation Load in Child Care Room

    영유아 보육공간에서 미세먼지의 외부 유입 및 실내 발생 부하 추정에 관한 연구

    Cho Sung-Won ・ Lee Seung-Rim ・ Yoo Ji-Hyun ・ Cho Ga-Young

    조성원, 이승림, 유지현, 조가영

    Atmospheric particle concentration is increasing in Korea owing to industrialization in Korea and the influence of China. Outdoor particles can enter buildings … + READ MORE
    Atmospheric particle concentration is increasing in Korea owing to industrialization in Korea and the influence of China. Outdoor particles can enter buildings through cracks or windows and affect the health of residents. Care rooms in childcare centers are meant for infants and children, who are more vulnerable to particles than adults; hence, indoor air quality management is necessary. Outdoor particles as well as the particles generated through children’s activities and indoor cooking should be considered for the assessment of indoor air quality of these places. Thus, particles that should be removed from such buildings comprise outdoor particles entering indoor and those generated indoor. The total concentration of these particles can be termed as particle load. Ventilation and air cleaning devices are effective in removing particle loads, and efficient indoor air quality management can be achieved by using devices of appropriate capacity and performance based on load estimation. Therefore, to estimate the particle load of care rooms, indoor air quality monitoring was conducted for one year, and the particle loads were estimated by analyzing the monitoring data. - COLLAPSE
    30 April 2022
  • Research Article

    Effect on Power Generation of Floating Photovoltaic Power System Power by Water Level Change

    수위변화에 의한 수상태양광 발전시스템 발전량 영향

    Kwon Tae Heun ・ Kim Jeong-yong ・ Kim Eui-kyung ・ Hong Sung-Kyu

    권태흔, 김정용, 김의경, 홍성규

    A floating photovoltaic power system is a power generation system that floats on the surface of water. Owing to its floating characteristics, … + READ MORE
    A floating photovoltaic power system is a power generation system that floats on the surface of water. Owing to its floating characteristics, the structure moves as the water level changes. In this study, we investigated whether the changes in water level affect the amount of power generated by the floating photovoltaic power system. We selected floating solar power plants that are currently in operation and analyzed the annual/monthly utilization rates. Our results confirmed that the utilization rate of the floating photovoltaic power system installed in areas with marked changes in water level is the lowest. In addition, correlation analysis of environmental factors that affect power generation such as solar radiation, temperature, humidity, wind speed, and water level confirmed that changes in water level resulted in decrease in power generation. - COLLAPSE
    30 April 2022
  • Research Article

    Analysis of Photovoltaic Panel Temperature and Photovoltaic Electric Power at Chuncheon Meteorological Station using Intensive Observation Period Data

    집중관측 자료를 이용한 춘천기상대 태양광 패널의 온도 및 태양광 발전량 분석

    Jee Joon-Bum ・ Zo Il-Sung ・ Lee Kyu-Tae ・ Lee Won-Hak ・ Choi Sung-Jin

    지준범, 조일성, 이규태, 이원학, 최성진

    In this study, photovoltaic (PV) electricity power and PV panel temperature for operation and monitoring of PV power plant were calculated and … + READ MORE
    In this study, photovoltaic (PV) electricity power and PV panel temperature for operation and monitoring of PV power plant were calculated and analyzed. A PV panel temperature sensor was installed at the Chuncheon Meteorological Observatory solar power plant for intensive observation from May 1 to August 19, 2018. When the calculated PV panel temperature was analyzed using the measured PV panel temperature, the calculated PV panel temperature was overestimated at a higher temperature compared to the measured PV panel temperature, which was overestimated at a lower temperature; however, the determination coefficient (R2) was 0.88 or more. The bias was -0.33°C and RMSE was 3.43°C when the ground observation data were used. However, when the Local Data Assimilation and Prediction (LDAPS) model were used, the bias was 0.22°C and RMSE was 4.27°C. The PV electricity power generation by ground meteorological observation data (Korea Meteorological Administration, KMA), LDAPS model prediction data (LDAPS), and Communication Ocean and Meteorological Satellite (COMS) data using the PV module temperature were compared with those of the Chuncheon PV power plant. The determination coefficient (R2) of PV power generation was the highest for KMA (0.91) followed by COMS (0.88) and LDAPS (0.84). The slope of the linear regression, (1.05) for KMA, and the smallest bias (2.24 kWh) and RMSE (3.38 kWh) were similar to the measured values. However, compared to the LDAPS, the slope (1.23) of the linear regression was the largest in COMS, and the bias (4.77 kWh) and RMSE (6.23 kWh) were slightly higher. - COLLAPSE
    30 April 2022
  • Research Article

    Dynamic Analysis of the Integrated System using Photovoltaic-Thermal and Air Source Heat Pump Considering Real Building Application

    실제 건물 적용을 고려한 태양광열 및 공기열원 융복합 시스템의 동적 해석

    Chae Soowon ・ Bae Sangmu ・ Nam Yujin

    채수원, 배상무, 남유진

    As regulations on renewable energy are strengthened and zero-energy buildings are becoming mandatory, research on the commercialization of renewable energy for heating … + READ MORE
    As regulations on renewable energy are strengthened and zero-energy buildings are becoming mandatory, research on the commercialization of renewable energy for heating and cooling buildings is accelerating. However, geothermal, photovoltaic, and solar heat are mostly applied as single systems, and there are few cases in which the disadvantages of individual systems are overcome or where the advantages are maximized. The purpose of this study is to develop an analysis model that can respond stably to heating and cooling loads in buildings and to analyze system performance. To stabilize the control of cooling, heating, and hot water supply, the operation method is divided into four cycles. In seasons when cooling and heating loads are significantly decreased, heating and cooling are performed directly by the heat pump without using storage tanks. In addition, a case study using late-night power was conducted to investigate efficient electricity use. Without late-night power, the heat pump coefficient of performance (COP) during the heating period was 2.5 and the monthly average heat exchange rate (HER) was 240 kWh; meanwhile, the COP during the cooling period was 3.99 and the HER was 880 kWh. The energy self-sufficiency rate during the heating period was 2.02 times higher than the cooling period. However, as a result of using late-night power, the electricity rate and COP during heating decreased by 2.5% and 2.04%, respectively, and the COP during cooling increased by 0.1%. This study presents basic data for the implementation of renewable energy systems and the design of predictive models. - COLLAPSE
    30 April 2022