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온도차에너지의 농어촌 활용을 위한 이용 가능량 및 법제도 분석
김진욱(Jinwook Kim),류연수(Yeonsu Ryoo),박미란(Milan Park) 한국신재생에너지학회 2015 신재생에너지 Vol.11 No.3
There is an ever-growing interest in alternative energy sources, and more and more technologies are becoming viable options as efforts to reduce greenhouse gas production and fossil fuel consumption increase. Unutilized energy has been attracting particular attention as a community based alternative energy source. Temperature difference energy is ubiquitous in nature, and it may be possible to harvest this energy without any significant influence on the local environment. In this study, we examined reserves and available capacity of temperature difference energy sources(treated sewage, river water, and an agricultural reservoir) for the supply of energy to a rural community. Reserves and available capacity of treated sewage were 6,555 Tcal/yr and, 4,318 Tcal/yr, respectively, while reserves and available capacity of river water were 192,000 Tcal/yr and 1,632 Tcal/yr, respectively. Agricultural reservoirs returned reserve and available capacity figures of 7,994 Tcal/yr and 141 Tcal/yr, respectively. In addition, we presented a review of legal and systematic considerations which might pave the way for larger scale temperature difference projects in the future. We also suggest a direction for future temperature difference energy based on the current Korean legal system.
저수지 내 수상태양광의 전압 강하에 의한 직류 송전 손실
방병관(Byeong Gwan Bhang),우성철(Sung Cheol Woo),이원빈(Wonbin Lee),최진호(Jin Ho Choi),신승욱(SeungWook Shin),이철성(ChulSung Lee),박미란(MiLan Park),원창섭(Changsub Won),안형근(HyungKeun Ahn) 한국신재생에너지학회 2020 신재생에너지 Vol.16 No.1
In Floating PV (Photovoltaic) systems, PV modules are installed on water by utilizing the surface of idle water such as a reservoir and multipurpose dam. A floating PV system, therefore, has the advantage of efficiency in national land use and improved energy yield owing to cooling effect compared to on-land PV systems. Owing to the limitation of installation environment for a floating PV system, the system, however, has the disadvantage of an increase in transmission distance of DC (Direct current) cables. A longer transmission distance of a DC cable results in greater power loss due to a voltage drop. This leads to a decline in economic feasibility for the floating PV system. In this paper, the economic analysis for 10 floating PV systems installed in a reservoir has been conducted in terms of a change in annual power sales according to the variation of transmission losses depending on the factors affecting the voltage drop, such as transmission distance, cross-section area of underwater cable, the presence of joint box, and PV capacity.