Solar Energy (태양에너지)

The Korean Solar Energy Society (한국태양에너지학회)
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Determination of the Optimal PTC Receiver Diameter Considering Heat Losses

열손실을 고려한 PTC(Parabolic Trough Concentrator) 흡수기 최적 직경 결정에 관한 연구

  • Kang, Y.H. (Korea Institute of Energy Research) ;
  • Kwak, H.Y. (Korea Institute of Energy Research) ;
  • Yoon, H.K. (Korea Institute of Energy Research) ;
  • Yoo, C.K. (Korea Institute of Energy Research) ;
  • Lee, D.G. (Korea Institute of Energy Research) ;
  • Seo, T.B. (Department of Mechanical Engineering, In-ha University)
  • Published : 2000.03.31
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Abstract

Considering the optical performance of the reflector and analyzing heat losses from the receiver, the optimal diameter of the absorber for a PTC(Parabolic Trough Concentrator) system was numerically determined. The results of this study were compared with the results of the IST (Industrial Solar Technology)-PTC test to verify the validity of the model. Good agreement was obtained with the deviation range from 0.4 to 7.7%. Generally, the net energy gained by the receiver shows the maximum at the particular absorber diameter and the specific gap size between the absorber and the glass envelop because the heat losses from the receiver becomes the minimum. The results showed that the conductive and convective heat losses became the minimum when the gap size was 7 to 10mm. Finally, it was known that the optimal absorber diameter was 62mm at $100^{\circ}C$, 57mm at $150^{\circ}C$, and 53mm at $200^{\circ}C$ of the absorber surface temperature, respectively.

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