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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.
김영민(Yeongmin Kim),오승진(Seung Jin Oh),현준호(Jun Ho Hyun),김남진(Nam Jin Kim),천원기(Wongee Chun) 한국에너지기후변화학회 2010 에너지기후변화학회지 Vol.5 No.2
There has been increasing interest in clean energy over past few years. The Development of Solar and Waste-heat powered Cooling and Absorption Desalination Technology have been examined as a viable option for supplying clean energy. In this study, The modelling of the main devices for Solar and Waste-heat powered Cooling and adsorption Desalination system was introduced. The design is divided into three parts. First, the evaporator for the vaporization of the top water is designed, and then the reactor for the adsorption and release of the steam is designed, followed by the condenser for the condensation of the fresh water is designed. In addition, new features based on the energy balance are also included to design the Cooling and Absorption Desalination system.
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.