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Title: Absorber Alignment Measurement Tool for Solar Parabolic Trough Collectors: Preprint

As we pursue efforts to lower the capital and installation costs of parabolic trough solar collectors, it is essential to maintain high optical performance. While there are many optical tools available to measure the reflector slope errors of parabolic trough solar collectors, there are few tools to measure the absorber alignment. A new method is presented here to measure the absorber alignment in two dimensions to within 0.5 cm. The absorber alignment is measured using a digital camera and four photogrammetric targets. Physical contact with the receiver absorber or glass is not necessary. The alignment of the absorber is measured along its full length so that sagging of the absorber can be quantified with this technique. The resulting absorber alignment measurement provides critical information required to accurately determine the intercept factor of a collector.
Authors:
;
Publication Date:
OSTI Identifier:
1040923
Report Number(s):
NREL/CP-5500-54214
TRN: US201211%%259
DOE Contract Number:
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: To be presented at the ASME 2012 6th International Conference on Energy Sustainability and 10th Fuel Cell Science, Engineering and Technology Conference, 23-26 July 2012, San Diego, California
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy Solar Energy Technologies Program
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 30 DIRECT ENERGY CONVERSION; ALIGNMENT; CAMERAS; CAPITAL; DIMENSIONS; FUEL CELLS; GLASS; PARABOLIC TROUGH COLLECTORS; PERFORMANCE; SOLAR COLLECTORS; TARGETS; CSP; PARABOLIC TROUGH; ABSORBER ALIGNMENT; CONCENTRATING SOLAR POWER; TROUGH COLLECTOR; Solar Energy - Thermal