WORKING FLUID SELECTION FOR AN INCREASED EFFICIENCY HYBRIDIZED GEOTHERMAL-SOLAR THERMAL POWER PLANT IN NEWCASTLE, UTAH

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WORKING FLUID SELECTION FOR AN INCREASED EFFICIENCY HYBRIDIZED GEOTHERMAL-SOLAR THERMAL POWER PLANT IN NEWCASTLE, UTAH ( working-fluid-selection-for-an-increased-efficiency-hybridiz )

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1. Colocation: Newcastle is in a remote area of Utah and there is much land that could be used near the geothermal wellheads where the solar field could be constructed. Using the geothermal field as part of the land where the solar field is constructed would reduce the overall footprint of the facility. 2. Thermal Efficiency: Increasing the thermal efficiency of the power cycle reduces the size of the solar field. For example, a small solar power plant produces 10 MWe. If this power plant produces at a thermal conversion rate of 9%, it would require 111 MWth of heat energy, whereas at 13% thermal efficiency it would only require 77 MWth. In other words, if this power facility increased its thermal efficiency by 4% it would require 34 MWth less thermal energy. At a design DNI of 750 W/m2 this would reduce the size of the solar field by 65,120 m2. The area of the solar field assumes 70% field collection efficiency. The solar field is only 35% of the actual land area; this reduction in the size of the solar field would reduce the land area required by 46 acres. 5.3 Thermal Storage Thermal storage was briefly mentioned in previous chapters when speaking of the solar power towers. It is also possible to implement thermal storage with solar trough plants. One way that this is done by heating the heat transfer fluid to 371°C (700°F) and transferring this thermal energy to cold salt and then storing the hot salt (Herrmann, 2004). For this hybrid geothermal-solar thermal power plant, salt thermal storage was not considered. It could be added in the future by increasing the size of the solar field to increase the amount of thermal energy collected. Even though solar salt was not 60

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