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Parabolic-Trough Technology Roadmap January 1999 (e.g., torque tubes and lighter metals, with a cable system providing strength), and new innovative designs may be possible. The structure currently represents about 40% of the total collector cost— easily the highest single subsystem cost and a prime target for cost reduction. Collector technology development, however, must advance in a logical manner. The first step is to define the current state-of-the-art collector that will be used in the next plants constructed. The second step is to develop an optimized trough collector design that will focus on further cost reduction in the next- generation trough plants. Advanced designs must be developed to continue driving down the cost and increasing collector efficiency. ÿ State-of-the-Art Collector The current LUZ trough collector has proven durable in field experience; however, in turn, this experience has pointed to needed improvements and suggested opportunities for evolutionary change. The LS-3 was designed to satisfy the perceived need for very large collector assemblies (545 m2, 99 m long) to reduce costs in large collector fields. Although this effort was successful, hindsight suggests that the previous LS-2 design (see Figure 9), based on a torque tube approach rather than trusses, may allow for better optical alignment over time because field realignment is easier. Other characteristics of the two designs should also be reexamined to develop an optimum mix. ÿ Optimized Steel Structure New materials and innovative designs must be integrated into a lower-weight, lower-cost solution. The design process for the structure, in particular, can benefit from a full design for manufacture and assembly (DFMA) methodology, which emphasizes standardized parts, minimal components, and efficient manufacturing and assembly operations. Reduced weight will be the primary outcome, coincident with reduced cost. Work being undertaken by European companies beginning in 1998 on the “EuroTrough” collector may offer opportunities for a collaborative solution. Figure 9. Row of LS-2 collectors at ÿ Advanced Design Concepts Kramer Junction New, innovative directions can lead to radical changes and steps resulting in reductions in cost. A strong steel structure supporting thick glass mirror panels is not the only solution to a trough structure-reflector combination. An approach taken by Industrial Solar Technology and others, including LUZ, is to utilize a lighter sandwich (sheet-metal panels reinforced by a nonmetallic internal layer, such as honeycomb) in a parabolic shape integrated with a front surface or film reflector. Other lightweight members, such as cables, can provide torsional strength against wind loads. Important issues such as reflector lifetime, ultimate strength, long-term alignment, and O&M requirements must be critically evaluated; however, the potential for significant cost reduction is attractive. Page 20PDF Image | A Pathway for Sustained Commercial Development and Deployment of Parabolic Trough Technology
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