Aiming factor to flatten the flux distribution on cylindrical receivers Articles uri icon

published in

publication date

  • June 2018

start page

  • 113

end page

  • 125

volume

  • 153

International Standard Serial Number (ISSN)

  • 0360-5442

Electronic International Standard Serial Number (EISSN)

  • 1873-6785

abstract

  • High incident flux gradients and hot spots lead to extreme thermal stresses that may damage and reduce the lifetime of central receivers. An aiming strategy based on a single parameter, k, named aiming factor, is developed to generate symmetric flux maps about the receiver equator. By means of this k factor, ranging between 3 (generally equivalent to equatorial aiming) and 0 (alternatively aiming to top and bottom borders), the solar flux incident on the receiver and the spillage losses can be controlled. For each sector in a heliostat field, the aiming factor values causing the flattest symmetric flux maps, k(flat), are deterministically found with a sweep and mesh shifting procedure. Results for Dunhuang solar power tower plant show that k(flat) is fairly constant throughout the year, except near sunrise and sunset in east and west sectors, respectively. (C) 2018 Elsevier Ltd. All rights reserved.

subjects

  • Physics

keywords

  • solar power tower; heliostat spillage; symmetric flux map; flat concentration profile; fluxspt tool