Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
권호 표지

Convective Heat Loss from Solar Tower Receiver with Tilt Angles and Operating Conditions

Solar Tower용 흡수기의 설치 각도 및 작동 조건 변화에 따른 대류 열손실 분석

  • Kang, Kyung-Mun (Dept. of Mechanical Eng., Graduate School, Inha University) ;
  • Lee, Ju-Han (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)
  • 강경문 (인하대학교 대학원 기계공학과) ;
  • 이주한 (인하대학교 대학원 기계공학과) ;
  • 김용 (인하대학교 대학원 기계공학과) ;
  • 서태범 (인하대학교 기계공학부) ;
  • 강용혁 (한국에너지기술연구원 고온태양열연구팀)
  • Published : 2007.12.30
Download PDF
⟨ Previous Next ⟩

Abstract

Convective heat loss from solar tower receiver is experimentally investigated in wind tunnel with tilt angles and operating conditions. In order to simulate the receiver, an electric heater, which is made of aluminum (width : 100 mm, height : 100mm) is used and installed in the wind tunnel. The convective heat loss from the receiver is dependent on the direction and the velocity of the wind and the surface temperature of the receiver. The tilt angle and surface temperature of the receiver are varied from 0o (cavity facing straight down) and 90o(cavity aligned horizontally) and from $150^{\circ}C$ to $250^{\circ}C$, respectively. Also, the wind speed is changed from 0 to 4m/s. The convective heat loss is obtained by measuring consumed power to the heater to maintain the desired surface temperature. It is concluded that Nusselt number increases with increasing wind speed for all cases. Especially, it is showed that Nusselt number can be maximized when the tilt angle is 30o.

Keywords

References

  1. N. Sendhil Kumar, K.S. Reddy, Numerical investigation of natural convection heat loss in modified cavity receiver for fuzzy focal solar dish concentrator, Solar Energy, Vol. 81, pp. 846 - 855, 2007 https://doi.org/10.1016/j.solener.2006.11.008
  2. S. Paitoonsurikarn, K. Lovegrove, On the Study of Convection Loss from Open Cavity Receivers in Solar Paraboloidal Dish Applications, Proceeding of Solar 2003, ANZSES Annual Conference 2003, Canberra, Australia
  3. R. A. Showle, J. D. Tarasuk, Experirrental and Nwnerical Studies of Natural Convection with flow seperation in Upward-facing inclined open cavities, Journal of heat transfer, Vol.115, pp. 592 - 605, 1993 https://doi.org/10.1115/1.2910729
  4. T. Taumoefolau, S. Paitoonsurikarn, G. Hughes, K. Lovegrove, Experimental Investigation of Natural Convection Heat Loss From a Model Solar Concentrator Cavity Receiver, Journal of Solar Energy Engineering, Vol.126, pp. 801 -807, 2004 https://doi.org/10.1115/1.1687403
  5. Clausing, An Analysis of Convective Losses From Cavity Solar Central Receivers, Solar Energy, Vol.27, No.4, pp. 295 - 300, 1981 https://doi.org/10.1016/0038-092X(81)90062-1
  6. 김종규, 강용혁, 김진수, 이상남, 유창균, 윤환기, 태양열발전용 흡수기 설계 및 열손실 특성설험, 한국 신.재생에너지학회 춘계학술발표대회, 2007