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2.4 Maintenance One of the greatest advantages of parabolic trough plants is that their operating and management costs are very low when compared to coal-fired power plants. With that being the case, one of the greatest costs in maintaining a trough plant is cleaning the mirrors. The greatest problem with the collection of dirt or clays on the mirrors is not the reduction in reflectivity, but the scattering of energy. Dirt on the surface of the mirrors changes the path of the reflected energy so that it does not strike the absorber tube, therefore causing a loss in collected energy. To minimize the size of the solar field, the troughs must be kept clean. Similarly, the glass tubes must also be kept clean. When all of the concentrated energy strikes the glass tubes, impurities can scatter the energy. This necessitates a larger solar field to obtain the same amount of thermal energy as a smaller, clean field. It has been suggested that the mirrors and glass tubes be cleaned with either just water or with a diluted mild detergent followed immediately by a rinse. If a detergent is used, it must not be allowed to dry on any surface of the trough or glass envelope. Water with high amounts of dissolved solids must not be used in cleaning the mirrors and tubes to avoid water spots being formed on any surface. To prevent the formation of water spots, the water must be treated or purified by a water softener, deionization unit or reverse osmosis. The cost of each of these cleaning methods, and required frequency of cleaning, should be considered and is one of the major costs in maintaining a solar thermal power plant. 22PDF Image | WORKING FLUID SELECTION FOR AN INCREASED EFFICIENCY HYBRIDIZED GEOTHERMAL-SOLAR THERMAL POWER PLANT IN NEWCASTLE, UTAH
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