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강은철(Kang Eun-Chul),아메드 나비드(Ahmed T Naveed),김용환(Kim Yong-Hwan),조일식(Cho Yil-Sik),이의준(Lee Euy-Joon) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-
Relatively higher electricity generation costs of PV due to the use of expensive PV raw materials is one of the barrier to its wide spread utilization as a clean and environmental friendly electricity source. One option to overcome this cost barrier is the use of concentrating photovoltaic(CPV) system. A CPV system with a linear Fresnel film collector has been proposed to make a focal line over PV module which can be rotated manually along two axes to track the sun and the measurement system. The experiments to analyze outdoor current and voltage on the CPV module were made on January 23, 2006 in Daejeon. As results, the electrical power output of the CPV module was 4 times higher than the PV module during the measurement duration. The power at the maximum point at the PV module was 15.3W at the 25℃. The fill factor and efficiency were 0.7 and 19.46% respectively. While the measurement temperature was 55℃ under concentration of 3.2 sun. The fill factor of the CPV module due to concentration and higher operating temperature was deteriorated as evident from the shape of the I-V curve. The efficiency and fill factor were 12.8% and 0.5 respectively. The power, current and voltage at the maximum power point concentration were 32.2W, 3.8A and 8.6V.
외기온도 변화에 대한 공기식 태양열 집열기의 열성능 신뢰성 검토 연구
김유진(Kim Yu Jin),왕은석(Wang Eun Seok),이범준(Lee Beom Joon),신형기(Shin Hyung Ki),이의준(Lee Euy Joon),강은철(Kang Eun Chul) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.3
Solar air collector is a technology that uses the solar radiation heat energy as a heat source for the ventilation and heating of buildings to reduce energy consumption. According to ISO 9806 solar air collector thermal performance evaluation, an indoor performance evaluation method uses a solar radiation simulator in indoor chambers, and an outdoor performance evaluation method uses natural solar radiation in outdoors. The thermal performance evaluation has to ensure the reliability of the thermal performance of the collector using the outdoor performance evaluation method that is affected by the changes in the seasonal outside air temperature. This study compared and analyzed the thermal performance of the glazed solar air collector depending on ambient temperature variations in February, March, and April. The average outside air temperature was -0.5°C in February, 13.4°C in March, and 21.1°C in April. The experiment indicated that the solar air collector thermal performance was 68.1% in February, 68.5% in March, and 63.8% in April and the temperature difference between the inlet and outlet with 1000 W/m² condition was 29.2°C in February, 27.5°C in March, and 29.0°C in April. These results indicated that seasonal ambient temperature variations had a small effect on the solar air collector thermal performance evaluation. Therefore, the result of the outdoor solar air collector thermal performance evaluation was reliable irrespective of the seasonal ambient temperature changes.
RETScreen을 활용한 건물에서의 지열 히트펌프 시스템 적용 사전 분석연구
김유진(Kim Yu Jin),이광섭(Lee Kwang-Seob),이의준(Lee Euy-Joon),강은철(Kang Eun-Chul) 한국태양에너지학회 2020 한국태양에너지학회 논문집 Vol.40 No.2
Korea government published renewable energy obligation policy that public building must be supplied some part of total consumption energy (2019: 27%, 2020: 30%). RETScreen is freely available global energy tool that developed by Canadian National Energy Laboratory to quantify energy saving to compare conventional system. This program can be performed energy modeling, cost analysis, greenhouse gas emission analysis and financial analysis. In this study, GSHP (Ground source heat pump) heating and cooling system were studied for the energy deliverly and ROI (Return On Investment) in an office building. Three cases were studied according to the number of HP (Heat pump) units for the 1,000㎡ office building located in Daejeon. Results indicated that the energy delivery of the case 1 (1 HP unit) covered 57% of the office building heating and cooling energy consumption. The case 2 (2 HP units) covered 87.8% and the case 3 (3 HP units) covered 96.8% of the office building energy consumption. The ROI of the case 1 indicated 7.9 years. While 8.2 years for the case 2 and 9.7 years for the case 3.
김유진(Kim Yu-Jin),김기봉(Kim Ki-Bong),이의준(Lee Euy-Joon),강은철(Kang Eun-Chul) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.1
Solar air thermal collectors are one of the technologies used to improve the efficiency of fresh air heating system in building spaces. Solar air collectors have the advantage of preventing freezing and overheating problems when compared with solar water collectors. However, thus far, there have been no harmonized thermal performance test facilities or round robin tests (RRT) based on the international standard ISO 9806 in Korea. In this study, an ISO 9806 thermal performance test facility was introduced and designed. In addition, an RRT was conducted based on ISO 9806 and compared to RRT sample Exova performance test results to verify the consistency of the thermal performance. The thermal efficiency ranged 36.06% ~ 72.02% depending on a change flow rate change of 36.6 ~ 182.9 m3/(hr·m2), respectively. The RRT was successfully conducted to compare the results of the Exova thermal performance test. A comparison between the Exova and KIER tests showed a relative error of 5.51% and 6.42% for ambient wind velocities of 1.0 and 1.8 m/s, respectively.