Abstract
A trapezoidal cavity absorber for a linear Fresnel reflector concentrator is analyzed and optimized via CFD simulation. The heat loss coefficient is introduced; the influences of ambient temperature, absorber temperature, cavity depth, inclination of side walls, insulation thickness, glass window, and emissivity of selective absorption coating have been studied. The results show that radiation dominates the cavity heat loss, and heat loss through the glass window is higher than through the insulation layer; among these factors, impact of emissivity of selective absorption coating and insulation layer is greater than that of the other factors. The simulation results via CFD prove that cavity with a 100 mm depth shows the best thermal performance among the parameters that have been taken into account.
Highlights
Concentrating solar collecting technology is necessary for the advanced solar thermal utilization which can obtain high temperature heat source
The solar concentrating collectors mainly consist of parabolic through collector (PTC), parabolic dish reflector (PDR), heliostat field collector (HFC), and linear Fresnel reflector (LFR) [1]
The LFR can be regarded as a decomposed PTC which consists of dozens of rows of primary reflecting mirrors and a stationary absorber
Summary
Concentrating solar collecting technology is necessary for the advanced solar thermal utilization which can obtain high temperature heat source. The solar concentrating collectors mainly consist of parabolic through collector (PTC), parabolic dish reflector (PDR), heliostat field collector (HFC), and linear Fresnel reflector (LFR) [1]. (3) efficient use of land since the primary reflecting mirrors can be placed one next to the other;. The LFR can be regarded as a decomposed PTC which consists of dozens of rows of primary reflecting mirrors and a stationary absorber (see Figure 1). Israel company Paz built an LFR system with a Compound Parabolic Collector (CPC) as the secondary reflector [7]. The Belgium company Solarmundo built a similar LFR system [8] but huge; the primary reflecting mirror area is 2500 m2, single mirror with a 0.5 m width. The first demonstration LFR power plant Puerto Errado had been built in Spain 2009
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
