Proceedings of the SAREK Conference (대한설비공학회:학술대회논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Thermal Performance of Air Receiver filled with Porous Material for $5kW_t$ Dish Solar Collector

공기식 흡수기를 이용한 5kW급 접시형 태양열 집열기의 열성능 해석

  • Seo, Joo-Hyun (Dept. of Mechanical Eng., Graduate School, Inha University) ;
  • Ma, Dae-Sung (Dept. of Mechanical Eng., Graduate School, Inha University) ;
  • Kim, Yong (Dept. of Mechanical Eng., Graduate School, Inha University) ;
  • Seo, Tae-Beom (Dept. of Mechanical Eng., Inha University) ;
  • Kang, Yong-Heack (Solar Thermal Research Center, Korea Institute of Energy Research) ;
  • Lee, Sang-Nam (Solar Thermal Research Center, Korea Institute of Energy Research) ;
  • Han, Gui-Young (Dept. of Chemical Eng., Sungkyunkwan University)
  • 서주현 (인하대학교 대학원 기계공학과) ;
  • 마대성 (인하대학교 대학원 기계공학과) ;
  • 김용 (인하대학교 대학원 기계공학과) ;
  • 서태범 (인하대학교 기계공학부) ;
  • 강용혁 (한국에너지기술연구원 태양열,수력연구센터) ;
  • 이상남 (한국에너지기술연구원 태양열,수력연구센터) ;
  • 한귀영 (성균관대학교 화학공학과)
  • Published : 2007.11.30
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Abstract

The thermal performance of the air receiver filled with porous material for 5kWt dish solar collector installed in Inha University, Korea, is experimentally investigated. The diameter of the parabolic dish is 3.2 m, and its focal length is 2 m. It consists of 10 small pieces of glasses which have their own curvatures, and the effective reflecting area is 5.9 m2. The reflectivity of the glass is 0.95, and the thermal capacity of the system is about 5 kW thermal. The aperture diameter of the cylindrical-shape receiver which is made of stainless steel is 100 mm, and the height is 210 mm. A quartz window is installed at the receiver aperture to minimize the convective heat loss and prevent air leakages. In order to increase the heat transfer area, porous material (nickel-alloy) is inserted into the receiver. Air flows into the upper part of the receiver, which is the opposite side of the aperture. After the air flows through the inside receiver, that goes out of the receiver through 3 exits which are located near the aperture. The volumetric flow rates of air are varied from 600 to 1200 L/min. The thermal efficiency of the receiver ranges from 82% - 92% depending upon the flow rate. The results show that the system efficiency and receiver efficiency increase as the volume flow rate increases as expected. These results from the experiment will be useful for the applications to air heating receivers and solar reactors.

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