Optical and thermal performance of a high-temperature spiral solar particle receiver
The optical efficiencies of SSPR were 84.1%, 84.8%, 76.6% for 60°, 90° and 120°, respectively. The spiral receiver was unsymmetrical, and the absorptivities of particles and steel surface were different. The particle temperature and the SSPR efficiency changed when the solar inclination angle ranged from 60° to 120°.