Measurement and correction on optical-thermal conversion of tubular solar cavity receiver with errors of installation and incident energy

Ze Wu, Xin-Lin Xia and Xiao-Lei Li

Energy, 2024, vol. 313, issue C

Abstract: The optical-thermal conversion performance of lab-scale solar receivers with a power greater than 10 kW is challenging to accurately evaluate due to errors of installation and incident energy. In this study, we utilized a solar simulator as the incident energy source for testing the outlet temperature of the solar receiver and proposed a method for correcting incident light power to precisely assess its optical-thermal conversion performance and potential. The impact of incident spot shift on the thermal conversion performance of the solar receiver is analyzed using Monte Carlo and CFD methods. Finally, based on experimental and simulation results, the operational characteristics of the solar receiver is predicted at a mass flow rate of 0.04 kg/s. The results indicate that when there is no deviation in spot position, the outlet temperature stabilizes at 1224K, whereas it stabilizes at 1215K with deviation present. However, there is a significant discrepancy of 159.7K between experimental and simulation results, which exceeds the variation caused by installation errors during verification (13K). Furthermore, compared to incident light incidence, deviations of 5 mm, 10 mm, 15 mm, 20 mm and 25 mm resulted in output power decreases by 0.08 %, 0.3 %, 1.35 %, 1.86 % and 2.8 % respectively. Considering fluctuations in optical-thermal conversion efficiency due to instantaneous changes in solar flow rate, averaging out oscillations reveals that after light power correction, the optical-thermal conversion efficiency can reach a peak value of 82.61 %, an increase of 8.33 % compared to before correction.

Keywords: Tubular-cavity solar receiver; Incident light power calibration; Optical-thermal conversion; Temperature distribution (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:313:y:2024:i:c:s0360544224036570

DOI: 10.1016/j.energy.2024.133879

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