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D-25 SL-5641 Final Table D-15 — SunLab Projected HCE Deployment and Costs Trough 100 Trough Trough 100 150 2007 2010 45,700 65,072 112,516 177,588 34 28 762 635 Trough Trough 200 400 2015 2020 86,101 172,201 263,688 435,889 22 18 508 400 Number HCE Number HCE Accumulative Cost, $/m2 field Cost, $/unit SEGS VI 1999 2004 9,600 57,216 9,600 66,816 43 43 847 847 D.5.2 Technology Improvements The Solel UVAC HCE is considered the current state-of-the-art receiver and will be used in the new near-term trough plants. Sandia National Laboratories (SNL) is investigating new concepts in receiver design that could result in substantially lower-cost receivers with nearly the same high performance as the Solel receivers (Price and Kearney 1999). One of the SNL designs uses a high-temperature gasketing approach for connecting the glass envelope to the metal absorber, in place of the glass-to-metal seal. To reduce convective heat losses, the receiver annulus between the glass and metal tube would be pressurized with an inert gas. Although preliminary testing shows potential, extensive long-term field-testing is required on any new receiver design to evaluate and validate the reliability and also to assess whether the receiver’s life-cycle costs have been lowered. In the last couple of years, the focus of the research has returned to evacuated receiver designs. The focus now is on developing a more robust and lower-cost glass-to-metal seal design and on identifying higher temperature selective coatings with better thermo/optic properties. Sandia has identified new materials that could be used in the glass-to-metal seal to reduce the potential stress in the seal. In general, however, the current Housekeeper seal used in the HCE is very expensive and a significant part of the total receiver cost. Sandia has also identified some new glass-to-metal seal options that have the potential to be much lower in cost to manufacture and be more robust at the same time. NREL has been evaluating new selective coatings. Several new cermet coatings have been identified that may be easier to manufacture and have better thermo/optic properties. These are multi- layer cermets as opposed to the graded cermet used by Solel. The graded cermets require a sputtered manufacturing process, whereas the multilayer coating can probably be deposited with simpler coating processes that facilitate better quality control of the final properties. NREL is also investigating changing the materialsPDF Image | Assessment of Parabolic Trough and Power Tower Solar Technology Cost and Performance Forecasts
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