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5. HYBRID GEOTHERMAL-SOLAR THERMAL POWER PLANT In the previous chapters various discrete concepts have been discussed all of which have an impact on the design of geothermal-solar thermal power plants. This chapter will start to bring together the concepts that have been introduced and show their importance. Newcastle, UT will be used to demonstrate integration of the key concepts. 5.1 Design Considerations The premise of a geothermal-solar thermal power plant is to have the geothermal portion of the power cycle running continuously; when adequate solar energy is available the operating conditions would change in order to produce more power at increased efficiency levels. Many different configurations of a hybrid plant such as this can be conceived. However what has been found that is the most efficient is often times the most simple. This has been the premise for the system proposed. Figure 26 is a schematic of a simple hybrid geothermal-solar thermal power plant. Notice that at the working fluid exit of the geo boiler / solar preheater the working fluid can go to either the solar boiler or to the low pressure turbine. During the night and/or when there is cloud cover such that the DNI is below 750 W/m2, the working fluid would be pumped to a pressure so that it would be boiled by the geothermal fluid and a valve would close forcing the vapor to the low pressure turbine. When the sun is shining and the DNI is at or above 750 W/m2, the working fluid would be pumped to a higher pressure, the valve to the low pressurePDF Image | WORKING FLUID SELECTION FOR AN INCREASED EFFICIENCY HYBRIDIZED GEOTHERMAL-SOLAR THERMAL POWER PLANT IN NEWCASTLE, UTAH
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