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태양 전지와 압전 재료를 이용한 하이브리드 발전시스템 개발
김영민,Ahmed, Rahate,ZEESHAN,천원기 한국태양에너지학회 2019 한국태양에너지학회 논문집 Vol.39 No.1
This paper deals with the operation of a hybrid power generation system made with photovoltaic cells and piezoelectric materials. The system can produce power from the wind as well as from the sun subject to their availability. Irrespective of the largeness of their power production, the power developed by both generators (i.e., phtovoltaic cells and piezoelectric cells) were combined and stored before it was applied to a load. Especially, the AC power (current) developed from each piezoelectric generator was converted by a full wave bridge rectifier and then combined prior to its storage in a capacitor. It was observed that the system can produce a maximum output power of 6.49 mW at loading resistance of 100 Ω.
Han, Hyun Joo,Mehmood, Muhammad Uzair,Ahmed, Rahate,Kim, Yeongmin,Dutton, Spencer,Lim, Sang Hoon,Chun, Wongee Elsevier 2019 Energy and buildings Vol.203 No.-
<P><B>Abstract</B></P> <P>The goal of this work was to develop an active daylighting system where constant illumination is made possible by mixing sunlight and artificial light as needed. A Fresnel lens mounted on a dual axis solar tracker was used to collect sunlight, which was then transmitted by an optical fiber cable. During its transmission, sunlight was mixed with light from an artificial light source (LED lamp, 120 W) to produce a constant flux of light before being discharged into a space. A constant level of illumination was achieved on the task plane throughout the system's operation. This system differs from other active daylighting systems, which require a sensor feedback from some reference point to control the amount of additional light provided to the interior spaces. It is expected that the system will enable solar constant lighting and energy efficiency in indoor illumination to be achieved. Based on a luminous efficacy of 17 lm/W for the LED lamp and operation of 8 h/day for 110 days annually, it is projected that 174 kWh of electric energy could be saved by the present system.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An active daylighting system was explored by mixing sunlight and artificial light for constant illumination. </LI> <LI> The system will allow the realization of solar constant lighting and energy efficiency in indoor illumination. </LI> <LI> Operation of the system could noticeably cut down the electric energy consumption for indoor lighting in buildings. </LI> <LI> A light source with a CCT of 5000 K in conjunction with sunlight delivers streams of light (mixed) very close to sunlight itself (bright daylight). </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Constant illumination system mixing sunlight and artificial light.</P> <P>[DISPLAY OMISSION]</P>