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태양추적식 자연채광 장치의 집광기 종류에 따른 성능 분석
김영민(Kim Yeongmin),김원식(Kim Won-Sik),정해준(Jeong Hae-Jun),천원기(Chun Wongee) 한국태양에너지학회 2017 한국태양에너지학회 논문집 Vol.37 No.1
This paper presents the effect of solar collectors on the performance of solar tracking daylighting systems. A series of measurements were made for two different types of solar collectors mounted on double axis solar trackers: Parabolic dish concentrator and Fresnel Lens. Indoor light levels were measured at different locations of an office space (longitude: 126.33 E, latitude 33.45 N) as photo sensors were placed on a task plane 80 cm above the floor. To accurately monitor the applicability of the systems, measurements were performed under clear and overcast sky conditions with the roll-screen (on the south window) in the down position. Comparing the illuminance data, the system with Fresnel lens outperformed that of parabolic dish concentrator. On clear days, the former delivered the light levels of 400~600 lux on the task plane whereas the latter recorded 100~200 lux. Depending on the amount of cloud cover, on overcast days, illuminance readings fluctuated to some extent.
소형 LTD 히트 엔진의 종류에 따른 기계적 출력 비교 분석
김영민(Yeongmin Kim),김원식(Wonsik Kim),정해준(Haejun Jeong),천원기(Wongee Chun) 한국태양에너지학회 2017 한국태양에너지학회 논문집 Vol.37 No.2
This paper compares the output power of different types of small Stirling engines in conjunction with the utilization of low grade thermal energy. A series of experimental measurements were performed to assess the output power of each engine under different conditions of the temperature difference between the hot and cold ends as well as applied weight. Results are presented in terms of torque and output power per heat transfer area. Among tested, the MM-7 engine produced the highest power of 4.455mW (321mW/m<SUP>2</SUP>) under a temperature difference of 40°C.
해수온도차발전 적용을 위한 자기열량효과 발전시스템 성능연구
김영민(Yeongmin Kim),양용우(Yong Woo Yang),고윤정(Yoonjung Ko),오승진(Seung Jin Oh) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
This study aimed to performance analysis of a magnetocaloric effect power generation system that can be operate at a low temperature difference of ocean thermal energy conversion system. The major components of the system are gadolinium(Gd) and permanent magnet, rotational motion is generated by the interaction of gadolinium with a permanent magnet. The electromagnetic and piezoelectric generator were connected to the gadolinium rotor, and the power generation performance by rotational motion was measured. The electromagnetic generator generated an output of open voltage 2V and a short circuit current 6mA when the temperature difference between hot and cold water was about 6.5℃ and the rotation speed was 130rpm. Under the same conditions, the piezoelectric generator produced an open circuit voltage and a short circuit current of 8V and 8.2μA, respectively.
해수온도차발전 적용을 위한 역자기열량효과 발전시스템 성능연구
김영민(Yeongmin Kim),고윤정(Yoonjung Ko),김종우(Jong Woo Kim),오승진(Seung Jin Oh) 대한설비공학회 2022 설비공학 논문집 Vol.34 No.12
This study aimed to performance analysis of a magnetocaloric effect power generation system that can be operated at a low-temperature difference in an ocean thermal energy conversion system. The major components of the system are a gadolinium (Gd) and a permanent magnet. Rotational motion is generated by the interaction of gadolinium with a permanent magnet. The electromagnetic and piezoelectric generators were connected to the gadolinium rotor, and the power generation performance by rotational motion was measured. The electromagnetic generator generated an output of open voltage 2V and a short circuit current of 6mA when the temperature difference between hot and cold water was about 6.5℃ and the rotation speed was 130rpm. Under the same conditions, the piezoelectric generator produced an open circuit voltage and a short circuit current of 8V and 8.2μA, respectively.