Abstract
To solve the dead space problem of conventional cavity receiver and increase energy conversion efficiency, cavity receiver with bottom surface interior convex was designed and fabricated. A low cost biaxial sun-tracking concentrated solar thermal utilization system using Fresnel lens as concentrator was designed and fabricated to test the thermal performance of cavity receiver, which can give a guidance for lab test of thermal performance of cavity receiver. Optical performance and thermal efficiency of cavity receiver with bottom surface interior convex was analyzed and measured through optical analysis and experimental test. Optical analysis indicated that the optical efficiency of the cavity receiver with bottom surface interior convex was 6.02% higher than that of conventional cavity receiver. A 4-h outdoor test showed that the average thermal efficiency of the cavity receiver with bottom surface interior convex was 4.1% higher than that of conventional cavity receiver.
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