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However, taken as a whole, they do confirm progress towards the technical feasibility and commercial viability of this technology. Much of the planned work has been slowed due to significant procurement delays of the primary mirror. This report describes the following investigations of various aspects of the system: (1) Performance specifications were developed for the tracking subsystem and collector optics, (2) Thermal management experiments for the fiber optic bundle entrance region, and (3) Bioreactor testing, cost-modeling, and redesign. The IR spectrum is filtered out to minimize unnecessary heating at the fiber entrance region. For the second generation (alpha) system, the secondary more » mirror is an ellipsoidal mirror that directs the visible light into a bundle of small-core fibers. In this project, the sunlight is collected using a one-meter paraboloidal concentrator dish with two-axis tracking. The luminaire can be a device to distribute sunlight into a space for the production of algae or it can be a device that is a combination of daylighting and electric lighting for space/task lighting. This RD&D project is a three year team effort to develop a hybrid solar lighting (HSL) system that transports daylight from a paraboloidal dish concentrator to a luminaire via a bundle of small core or a large core polymer fiber optics. (1) TRNSYS Modeling of a Hybrid Lighting System: Building Energy Loads and Chromaticity Analysis (2) High Lumens Screening Test Setup for Optical Fibers (3) Photo-Induced Heating in Plastic Optical Fiber Bundles (4) Low-Cost Primary Mirror Development (5) Potential Applications for Hybrid Solar Lighting (6) Photobioreactor Population Experiments and Productivity Measurements and (7) Development of a Microalgal CO2-Biofixation Photobioreactor.
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Taken as a whole, they confirm significant progress towards the technical feasibility and commercial viability of this technology. This report describes the following investigations of various aspects of the system. The photobioreactor team also made major advancements in the testing of model scale and bench top lab-scale systems. A test plan was developed for both the high-lumen tests and the study to determine the non-energy benefits of daylighting. The TPV array and nonimaging device have been tested and progress has been made in the fiber transmission models. The TRNSYS Full-Spectrum Solar Energy System model has been updated and new components have been added. For the Alpha system, the eight individual 12 mm fibers have been replaced with a centralized bundle of 3 mm fibers. During this reporting period, the project team made advancements in the design of the second generation (Alpha) system. The IR spectrum is directed to a thermophotovoltaic (TPV) array to produce electricity. Each fiber can illuminate about 16.7 m) of office space. This results in about 8,200 lumens incident at each fiber tip. The secondary mirror consists of eight planar-segmented mirrors that direct the visible part of the spectrum to eight fibers (receiver) and subsequently to eight luminaires. The luminaire can be a device to distribute sunlight into a space for the production of algae or it can be a device that is a combination of day lighting and fluorescent lighting for office lighting. This RD&D project is a three year team effort to develop a hybrid solar lighting (HSL) system that transports day light from a paraboloidal dish concentrator to a luminaire via a large core polymer fiber optic.