研究目的
To characterize and validate the second generation linear focus sun simulator (OptiRec) for determining the optical performance of parabolic trough receivers, comparing its performance with the first generation test bench (ElliRec).
研究成果
The OptiRec test bench demonstrates improved repeatability (0.13% 1σ) and reduced measurement time compared to the ElliRec. The intercomparison campaign showed that the results for relative optical efficiency agree within 1.1%, with differences attributed to spectra and incidence angles. The use of standard, diffuse reflecting, tightly fixed shields is recommended for high repeatability.
研究不足
The differences in spectra and incidence angles between the first and second generation test benches may affect the comparability of results. The use of different shield configurations (manufacturer shields vs. OptiRec shields) also introduces variability in measurements.
1：Experimental Design and Method Selection:
The test facility optics consists of an elliptical shaped glass mirror trough with flat end mirrors. Radiation from six metal halide lamps in the first focal line is concentrated on a parabolic trough receiver in the second focal line. The absorbed power is determined from the measured temperature increase of water flowing through the receiver and its mass flow rate.
2：Sample Selection and Data Sources:
Seven receivers from different manufacturers were measured in both test benches (OptiRec and ElliRec) to compare their optical performance.
3：List of Experimental Equipment and Materials:
The test facility includes an elliptical shaped glass mirror trough, six metal halide lamps, and a hydraulic circuit for water flow measurement.
4：Experimental Procedures and Operational Workflow:
The measurement of optical efficiency involves comparing the absorbed power for the sample receiver to that of a reference receiver. The absorbed power is determined from the mean value of a five-minute testing period after a five-minute equalization phase.
5：Data Analysis Methods:
The optical efficiency is calculated relative to the optical efficiency of the reference receiver, with repeatability and standard deviation analyzed for both test benches.
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