Concentrating Solar Power

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Concentrating Solar Power ( concentrating-solar-power )

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High-Flux Solar Furnace / Mesa Test Facility, National Renewable Energy Laboratory, Golden, CO The power generated at the High-Flux Solar Furnace (HFSF) at the National Renewable Energy Laboratory in Golden, CO, can be used to expose, test, and evaluate many CSP components, such as receivers, collectors, and reflector materials. The 10-kilowatt HFSF consists of a tracking heliostat and 25 hexagonal mirrors to concentrate solar radia- tion. The solar furnace can nominally provide flux at 2,500 suns, but using specialized secondary optics, can boost the flux to 20,000 suns. The operational characteristics and size of the facility make it ideal for testing over a wide range of technologies with a diverse set of experimental requirements. The high heating rates make the HFSF an ideal tool for testing high-temperature materials, prototype advanced NREL’s Large-Payload Tracker. converters and chemical reactors for solar electric and solar chemistry applications. Researchers can also use the HFSF to evaluate and develop state-of-the-art measurement systems for the extreme solar environment. NREL recently acquired a multipurpose, large-payload tracker to support testing of solar components that require tracking the sun in elevation and/or azimuth. Concentrating collectors require 1- or 2-axis tracking to focus sunlight on a thermal or PV receiver. For flat-plate collectors, flat-plate PV, or solar hot water, this would imply tracking to minimize variation in solar resource during on-sun testing. As applicable, the site can be used to supplement metrology activities that require 2-axis tracking for simultane- ous calibration of a large number of solar radiation measurement instru- ments. The large-payload tracker is capable of carrying a maximum vertical load of 9,000 pounds. sun’s energy on a pipe located along its focal line. A heat-transfer fluid—typically, oil at temperatures as high as 400°C (750°F)—is circulated through the pipes and then pumped to a central power block area, where it passes through a heat exchanger. The heat-transfer fluid then generates steam in a heat exchanger, which in turn is used to drive a conventional steam turbine generator. Fig. 3.2.5-2 Schematic of a parabolic trough CSP plant. 64

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