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Hybrid Solar Lighting Analysis of the reference system has identified technical improvement opportunities for overcoming barriers related to cost, performance, and reliability. Figure 3.3.6-3 shows the Tier 1 and Tier 2 TIOs. The impacts of different TIOs on overall cost of avoided energy have been analyzed, in some cases at additional levels of detail. Fig. 3.3.6-3 HSL TIOs and associated metrics. Shading indicates degree of impact each TIO has on each metric and overall system LEC: red (dark) is high; yellow (light) is medium; no shading is low. The greatest technical challenges/barriers remaining for the HSL project are as follows: 1. The reliability and installed cost of the 2-axis tracking mechanism and control electronics. 2. The high optical absorption and costs associate with the system’s plastic fiber-optic bundles. 3. Demonstrating and quantifying waste heat avoidance from HSL with respect to fluorescent or incandescent illumination. In recent years, great progress has been made in improving the reliability and cost of the HSL tracking mechanism and control electronics. However, to continually improve the system’s reliability and lifetime, we need smarter controls that use feedback sensors and self-learning algorithms, as well as improved mechanical designs combined with extensive field testing of the HSL tracker. The goal is to achieve a 20-year HSL system lifetime with reliable performance and self-correcting alignment capabilities under harsh environmental conditions. Tracking system costs will drop from $8,000 to $3,000, and installation costs will drop from $12,000 to $3,000. In addition, a less expensive plastic optical fiber bundle with improved optical performance is critical to the success of the HSL project. Currently, the HSL technology distributes sunlight via a 30-foot plastic optical fiber bundle. Significantly increasing the length of the bundle results in undesirable reductions in delivered light and can result in noticeable changes to the lighting color. In addition, the cost of this 30-foot bundle is currently $3500. To reduce the overall cost of the HSL system, a bundle target cost of $1000 should be achievable by improving the bundle fabrication process and using an improved polymethyl-methacrylate (PMMA) purification technique. These improvements should result in lower optical absorption by the optical fibers, allowing for longer bundle lengths that better maintain the intensity and color of the delivered sunlight. 90PDF Image | Concentrating Solar Power
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