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ผู้เขียน หัวข้อ: Optimization of the lighting system for a Hydraulically Integrated Serial Turbid  (อ่าน 1343 ครั้ง)
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« เมื่อ: เมษายน 28, 2014, 11:50:47 AM »

Optimization of the lighting system for a Hydraulically Integrated Serial
Turbidostat Algal Reactor (HISTAR): Economic implications

Barbara C. Benson 1, Maria T. Gutierrez-Wing, Kelly A. Rusch *
Louisiana State University, Department of Civil and Environmental Engineering, 3304 Patrick F. Taylor Hall, Baton Rouge, LA 70803, United States

A B S T R A C T


An estimated 28% of the production cost in HISTAR systems that are artificially illuminated is attributed to the lighting cost. This cost estimated is based on an operational configuration comprised of eight CFSTRs, a system dilution rate (Ds) of 0.640 d1, and 400Wmetal halide lamps positioned at an elevation of 38.1 cm over the culture. Deterministic model simulations of the volumetric productivity (Pv), photosynthetic efficiency (Eo) and lighting cost (LC) under various management strategies, operational parameters and reactor design configurations were performed and compared to the simulation results obtained for the original configuration. The simulations showed that LC may be reduced by 35.5% by switching from a metal halide (MH) to high-pressure sodium (HPS) light source at an optimum system dilution rate Ds = 0.641 d1. LC may be reduced by an additional 17.8% through decreasing the lamp elevation to 25.4 cm. Increasing the wattage of the light source from 400 to 1000Win the last six reactors would reduce the LC by 13% from the original cost. Overall, using HPS lamps at 25.4 cm height, with six 1000Wand two 400Wlamps at a Ds = 0.641 d1 will result in a 54% overall LC reduction compared to the
original configuration of HISTAR. This represents a 13% reduction in the overall microalgal production cost for HISTAR.

Keywords:HISTAR, Microalgal culture, Light dynamics, Productivity model, Economics
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