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The LS-2 collector uses a torque-tube, galvanized-steel structure with a silvered glass reflector and an evacuated receiver with a Cermet selective coating. The LS-2 collector has demonstrated excellent performance, high availability, and ease of installation and maintenance. There are several concerns with the LS-2 collector: the capital cost, the lifetime of its evacuated receiver, and the fact that no company currently markets the LS-2 design. Recent cost studies by Flabeg Solar International (Pilkington Solar International, 2000) have estimated collector costs around $200/m2 for the third-generation Luz parabolic trough collector design (LS-3) for a solar field of 200,000 to 300,000 m2. Given roughly similar components and weight, it is assumed that the LS- 2 collector is approximately similar in cost. Much effort is currently being focused on resolving the receiver reliability issues, which seems to be related to reliability of a glass-to-metal seal that is necessary for an evacuated receiver. One option under consideration for ORC plants is to use a non-evacuated receiver. Although this will result in reduced solar field performance, it could also reduce cost and improve collector field reliability. Figure 20 indicates a drop of less than 5% by going to a non-evacuated receiver. Also, note that the solar collector efficiency at ORC temperatures is about the same with a non-evacuated receiver as it is for an evacuated receiver operating at the temperatures required for a steam power plant. Collectors for smaller ORC plants would likely be higher in cost, so some focus is required to find ways to reduce installation and the transaction costs for small systems. The LS-2 collector would be most attractive if it were also being used for large trough projects. This would help drive the cost down for small systems. 27PDF Image | Modular Trough Power Plant Cycle and Systems Analysis
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