• Title/Summary/Keyword: Solar Power

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A Study on Application of New & Renewable Energy for Environmental-friendly Planning of Rural Villages - Analysis of Solar Energy Resources - (친환경 농촌마을계획을 위한 재생에너지 활용방안 연구 - 태양에너지 자원분석 -)

  • Nam, Sang-Woon;Kim, Dae-Sik
    • Journal of The Korean Society of Agricultural Engineers
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    • v.50 no.3
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    • pp.105-112
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    • 2008
  • Solar energy, which is one of renewable energy, would be the most useful resources that can be applied to making energy recycling villages without using fossil energy. This study analyzed energy potential on solar energy considering weather condition in three traditional villages and compared with energy consumption surveyed. A photovoltaic system having 3.0kWp capacity of unit module can generate 182.5%, 96.1% and 170.9% of the yearly mean consumption of electric power in Makhyun, Boojang, and Soso, respectively. A flat-plate solar collector having $2.64m^2$ area of unit module can generate warm water of $142{\ell}$/day, $89{\ell}$/day, and $173{\ell}$/day, respectively in three study villages. In Makhyun and Soso, photovoltaic power and warm water produced by solar energy were sufficient to supply required amount of electric power and warm water. However, both electric power and warm water produced by unit solar module were not sufficient in Boojang area, and so it is required to increase the module area by more than 50%. According to the results of this study, the appropriate combination of energy resources can be applied to rural green-village planning if the characteristic of energy potential for each local area is considered.

300-W-class Side-pumped Solar Laser

  • Qi, Hongfei;Lan, Lanling;Liu, Yan;Xiang, Pengfei;Tang, Yulong
    • Current Optics and Photonics
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    • v.6 no.6
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    • pp.627-633
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    • 2022
  • To realize uniform side pumping of solar lasers and improve their output power, a solar concentrating system based on off-axis parabolic mirrors is proposed. Four identical off-axis parabolic mirrors with focal length of 1,000 mm are toroidally arranged as the primary concentrator. Four two-dimensional compound parabolic concentrators (2D-CPCs) are designed as a secondary concentrator to further compress the focused spot induced by the parabolic mirrors, and the focused light is then homogenized by four rectangular diffusers and provides uniform pumping for a laser-crystal rod to achieve solar laser emission. Simulation results show that the solar power received by the laser rod, uniformity of the light spot, and output power of the solar laser are 7,872.7 W, 98%, and 351.8 W respectively. This uniform pumping configuration and concentrator design thus provide a new means for developing high-power side-pumped solid-state solar lasers.

High-Temperature Solar Thermal Technologies: 2008 SolarPACES Symposium Review (고온태양열 활용기술 최근동향: 2008 SolarPACES Symposium Review)

  • Kim, Jin-Soo;Kang, Yong-Heack;Kim, Jong-Kyu
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.05a
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    • pp.174-177
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    • 2008
  • The proceeding of the $14^{th}$ biennial concentrating solar power SolarPACES symposium was closely reviewed and summarized to have an overview on up-to-date concentrated solar thermal technologies. A number of studies covering parabolic trough concentrating system, central receiver technology, solar fuels, dish and others were presented in the symposium which was held in Las Vegas, USA, from 4 to 7, 2008. Based on this overview a brief summary of technology trend and prospects were added in the paper.

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Development of Energy Storage System Combined with Solar System and Superconducting Magnet (초전도 마그넷을 이용한 태양광에너지 저장장치 개발)

  • Kim, Dae-Wook;Chung, Yoon-Do;Yoon, Yong-Soo;Kim, Tae-Jung;Kim, Hyun-Ki;Ko, Kae-Kuk
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.888-889
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    • 2011
  • As new one of superconducting power supplies, we proposed an HTS flux pump utilized a solar energy system. As an eternal electric energy can be converted by the solar system, the solar energy system is promisingly applied as an energy source in the power applications. A solar energy system is comprised of solar panel, photo-voltaic (PV) controller, converter and battery. The HTS flux pump consists of an electromagnet, two thermal heaters and a Bi-2223 magnet. In this paper, we describe the possibility the fusion technology between superconducting power supply and solar energy system. As a fundamental step, the fabrication, structure and experimental results are explained.

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A Design of the Solar Tracker for LED Streetlight in Using Solar Cell (태양전지를 이용한 LED 가로등의 태양광 추적 장치 설계)

  • Lee, Ok-Jae
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.12
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    • pp.1-9
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    • 2013
  • A standalone LED lighting system in using solar energy has been used usually less than 70W of lighting power because of a troublesome installation and maintenance. In this system, as more and more LED lighting power increases, the capacity of photovoltaic panel does proportionally, and to improve the charging efficiency of solar energy, MPPT(Maximum Power Point Tracking) techniques is used frequently, but the solar tracker is not. In this paper, a solar tracker which traces the light of the sun in varying hour to hour is studied to apply to the standalone LED lighting system. This solar tracker consists of twin axis for tracing the azimuth and altitude respectively, and it has a robust structure with safe mode to stand a strong wind. As a result of analysis, generating efficiency of the traced type has improved on the fixed one 28.84% on average.

Design of Sun Tracker System for Solar Power Generation (태양광 발전을 위한 태양추적시스템 설계)

  • An, Jun-Sik;Heo, Nam-Euk;Kim, Il-Hwan
    • Proceedings of the KIEE Conference
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    • 2006.10c
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    • pp.330-332
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    • 2006
  • In this paper, sun tracking system using Sun position sensor is proposed, the sun tracking system designed as which raises the efficiency of solar power generation. It design the structure being simple and it develops the system which is economical efficiency. It develops the hazard technique such as location tracking method of the sun which uses the sensor and to use the motor solar cell module movement. The Sun tracking system makes the drive in order to do with one axis and to use the sensor and to know in order to put out, the location of the sun and it makes. To make the solar location tracking sensor where the structure is simple it used two solar cells.

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A Stand-alone Source System using the Solar cell (태양전지를 이용한 독립형 전원시스템)

  • Lee, Jeong-Joon;Jho, Jeong-Min;Sung, Nark-Kuy;Lee, Seung-Hwan;Oh, Bong-Hwan;Han, Kyung-Hee
    • Proceedings of the KIEE Conference
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    • 1999.07f
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    • pp.2565-2567
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    • 1999
  • The output characteristics of solar cell vary with load and solar insolation. Therefore solar cell must always track maximum power point. If photovoltaic system is stand-alone. It is necessary to maintain for output of voltage source inverter. In this paper, stand-alone photovoltaic system consists of boost chopper and voltage source inverter. We make it to track maximum power point by revolution of solar cell array instead of detecting situation of sun in any conditions. And we prove that maximum power point tracking by revolution of solar cell array is better than fixed solar cell.

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Thermal Test of High-Temperature Solar Concentrating System for Hybrid Power Generation (복합발전용 고온 집광시스템의 집열 특성 분석)

  • Kim, Jin-Soo;Lee, Sang-Nam;Kang, Yong-Heack;Yun, Hwan-Ki;Yun, Chang-Kyun;Kim, Jong-Kyu
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.06a
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    • pp.580-583
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    • 2006
  • A small-scale solar concentrating system was developed and demonstrated for supplying process heat required in solar thermo chemical reaction. The concentration system consists of a heliostat equipped with a solar tracking device and a dish concentrator. From the initial thermal test of the concentrating system it was found that the system works very well with around 500-600 concentration ratio capable of supplying about 3kW therml energy to the reactor. Once the concentration system was turned on, the reactor temperature rapidly increased over $1,000^{\circ}C$ and could be maintained high enough for solar chemical reaction.

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Recent Progress in Solar Energy Research - A review of Papers Published in the Korean Journal of Solar Energy between 2000 and 2002 - (태양에너지 분야의 최근 연구동향- 2000년$\sim$2002년 학회지 논문에 대한 종합적 고찰 -)

  • Yoo, Ho-Chun;Jang, Moon-Seok
    • Journal of the Korean Solar Energy Society
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    • v.22 no.4
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    • pp.107-119
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    • 2002
  • A review on the papers published in the Korean Journal of Solar Energy between 2000 and 2002 has been done. Focus has been put on current status of research in the aspect of Insolation. Solar Collector and Storage System, Solar Heating and Cooling System, Solar Cell and Lighting System, Active and Passive Solar Building, Heat Transfer in Solar Energy and Natural Energy. The conclusions are as follows. 1) Many studies on Insolation were conducted to optimize the usage of Solar Energy. 2) A review of the recent studies on solar thermal shows that there were many papers on solar collector and storage system. However, studies on the HVAC system using solar energy were relatively insufficient. 3) To produce high efficient solar cell. various experimental and numerical papers were published. However studies on control system, solar cell and lighting were seemed to be insufficient. 4) Studies on using solar energy in passive solar buildings were widely carried out, however, studies based on synthetic analysis of buildings and BIPV were insufficient. 5) Studies on heat transfer were mainly about heat exchanger, performance of heat pipe and multi air conditioner. 6) Studies on energy resources except for solar energy, such as hydraulic power and wind power etc. were very few.

Photovoltaic Power Generation Control by A New Buck-Boost chopper circuit (새로운 승강압 초퍼회로에 의한 태양광발전제어)

  • Kim, Y.C.;Byun, H.G.;Suh, K.Y.;Lee, H.W.
    • Proceedings of the KIEE Conference
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    • 1997.07f
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    • pp.2177-2180
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    • 1997
  • The solar cell has an optimum operating point to be able to got maximum power. To obtain maximum power from Photovoltaic array, hotovoltaic power system usually requres maximum power point c tracking controller. The output characteristics of solar cell are nonlinear, and these characteristics vary with load solar insolation, solar cell temperature. Therefore the tracking control of maximum power point is the com-plicated problem. This paper presents power characteristics of residential Photovoltaic system applying a buck-boost conversion system.

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