• 제목/요약/키워드: Dish-type solar receiver system

검색결과 16건 처리시간 0.024초

KIERDISH II 태양열 집광시스템의 플럭스밀도 분포 (Flux Density Distribution of the Dish Solar Concentrator (KIERDISH II))

  • 강명철;강용혁;유성연
    • 한국태양에너지학회 논문집
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    • 제24권4호
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    • pp.11-18
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    • 2004
  • A solar concentrator, named KIERDISH II, was built at KIER in order to investigate the feasibility of high temperature solar energy application system. The constructed concentrator is a dish type solar concentrator with a focal length of 4.68m and a diameter of 7.9m. To successfully operate KIERDISH II, optimal design of the absorber is very important and flux density distribution has to be known. The focal flux density distribution on the receiver was measured. We have observed the shape and size of flux images and evaluated percent power within radius. Flux density distribution is usually measured by a CCD(charge coupled device) camera and a radiometer. In this paper we present a flux mapping method to estimate the characteristic features of the flux density distribution in the focal region of solar concentrator. The minimum radius of receiver is found to be 0.15m and approximately 90% of the incident radiation is intercepted by receiver aperture.

Estimation of Heat Losses From the Receivers for Solar Energy Collecting System of Korea Institute of Energy Research

  • Ryu, Siyoul;Seo, Taebeom
    • Journal of Mechanical Science and Technology
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    • 제14권12호
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    • pp.1403-1411
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    • 2000
  • Heat losses from the receivers for a dish-type solar energy collecting system constructed at Korea Institute of Energy Research are analyzed. The Stine and McDonald's model is used to estimate the convection loss. The Net Radiation method and the Monte-Carlo method are used to calculate the radiation heat transfer rate from the inside surface of the receiver to the surroundings. Two different receivers are suggested here and the performances of the receivers are estimated and compared with each other based on the prediction of the amount of heat losses from the receivers. The effects of the receiver shape and the radiation properties of the surface on the thermal performance are investigated. The performance of Receiver I is better than that of Receiver II, and the amount of solar irradiation that is not captured by the captured by the receiver after being reflected by the concentrator becomes significant if the temperature of the working fluid is low.

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Dish형 태양열 집광시스템 실증연구를 위한 집열성능 특성 분석 (A Characteristic Analysis on the Thermal Performance of the Dish Type Solar Concentrating System)

  • 강명철;강용혁;윤환기;유성연
    • 한국태양에너지학회 논문집
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    • 제26권1호
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    • pp.7-12
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    • 2006
  • The dish type solar thermal concentrating system can collect the solar energy above $800^{\circ}C$. It has a concentration ratio of 800 and total reflector area of $49m^2$. To operate solar receivers at high temperature, the optimum aperture size is obtained from a comparison between maximizing absorbed energy and minimizing thermal losses. The system efficiency is defined as the absorbed energy by working fluid in receiver divided by the energy coming from the concentrator. We find that system efficiency is stable in case of flow rate of above 6lpm. The system efficiency are 64.9% and 65.7% in flow rate of 6lpm and 8lpm, respectively. The thermal performance showed that the maximum efficiency and the factor of thermal loss in flow rate of 8lpm are 68% and 0.0508.

접시형 태양열 집광시스템용 흡수기의 열손실 해석 (An Analysis of Heat Losses from Receivers for a Multifaceted Parabolic Solar Collector)

  • 류시열;서태범;강용혁
    • 태양에너지
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    • 제20권3호
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    • pp.61-73
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    • 2000
  • Heat losses from receivers for a dish-type solar energy collecting system are numerically investigated. The analytical method for predicting conductive heat loss from a cavity receiver is used. The Stine and McDonald Model is used to estimate convective heat loss. Two kinds of techniques for the radiation analysis are used. The Net Radiation Method that is based on the radiation heat balance on the surface is used to calculate the radiation heat transfer rate from the inside surface of the cavity receiver to the environment. The Monte-Carlo Method that is the statistical approach is adopted to predict the radiation heat transfer rate from the reflector to the receiver. Based on the heat loss analysis, the performance of two different receivers for multifaceted parabolic solar collectors with several flat facets can be estimated, and the optimal facet size is obtained.

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이차원 사각형 공동 내부에서의 강제 대류 열전달 (Forced Convection Heat Transfer from an Inner Surface of a Two-Dimensional Rectangular Cavity)

  • 서태범;한귀영;강용혁
    • 한국태양에너지학회 논문집
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    • 제22권4호
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    • pp.77-84
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    • 2002
  • In order to investigate forced convection heat transfer due to the wind from the inner surface of a cavity receiver for a parabolic dish type solar energy collecting system, a two-dimensional rectangular cavity receiver is prepared and installed in a wind tunnel. The convection heat transfer coefficient of the inner surface of the receiver is dependent on the direction and the velocity of the wind. The attack angle of the cavity and the air velocity in the tunnel are controlled in a wide range so that the effects of the attack angle and the wind velocity on the heat transfer coefficient can be studied. The skirt is installed at the aperture of the cavity in order to reduce convective heat loss. The effects of the length and the installation angle of the skirt on convection heat transfer of the cavity are tested. It is found that convection heat loss can be significantly reduced by installing the skirt. Also, it is known that heat transfer from the cavity can be minimized if the angle of the skirt is $90^{\circ}$ to the outer surface of the cavity.

소형 스털링 엔진을 이용한 태양열 발전 시스템 (Solar Power Generation System Using A Small-Sized Stirling Engine)

  • 김기범
    • 한국산학기술학회논문지
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    • 제13권8호
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    • pp.3339-3344
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    • 2012
  • 태양 에너지 변환 효율이 높은 접시형 집광기와 스털링 엔진을 이용한 발전 방식을 조사하기 위하여 본 연구에서는 소형 스털링 엔진을 이용하여 좁은 공간에서 발전용으로 사용할 수 있는 시스템을 개발하였고, 기초 실험을 수행하였다. 본 연구에서 제작한 발전 시스템을 위하여 50만원의 제작비가 소요되었고, 제작한 시스템으로 최대 0.56 kWh의 전기를 발전하였으며, 에너지 변환 효율은 약 10%로 측정되었다. 시스템의 최적 설계를 통하여 더 높은 출력을 얻을 수 있으며, 본 연구의 기초 실험 데이터는 많은 태양열 발전 관련 분야에서 유용하게 사용될 것으로 사료된다.