Heat-Loss Testing of Solel's UVAC3 Parabolic Trough Receiver

摘要

Researchers at the National Renewable Energy Laboratory completed heat-loss testing on two of Solels UVAC3 parabolic trough receivers. The receivers showed identical heat losses within experimental uncertainty. Normalized per meter of receiver length, heat losses are 130, 200, 310, and 460 W/m at average absorber temperatures of 300DG, 350DG, 400DG, and 450DGC, respectively. Experimental uncertainty is about -10 W/m. A correlation was developed to predict receiver heat loss as a function of the difference in DGC between the average absorber temperature and ambient temperature. Care must be taken to apply this correlation within context. The correlation was derived with ambient temperatures of about 23DGC, and it should not be used to predict heat losses at ambient temperatures more or less than 10DGC from this value. This limitation is explained further in the report. UVAC3 heat losses were compared to heat losses from UVAC2, the previous generation of receiver.