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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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6.3 Recommendations for Newcastle Geothermal-Solar Thermal Hybrid Plant The future of the geothermal-solar thermal hybrid power plant technology depends heavily on capital and operating costs including construction, materials, parabolic troughs, process equipment, working fluid, heat transfer fluid and plant maintenance. Capital cost could be depreciated by production and sale of electric power and by electric cost savings at the Milgro Newcastle greenhouses since the power will be consumed by that facility. Since the limited solar data taken at Newcastle, UT matched very well with NREL’s Cedar City, UT data it was presumed that Cedar City information could be used to represent Newcastle DNI measurements throughout the year. It is recommended that solar irradiance measurements continue to be taken to compare with those acquired at Cedar City - until at least one year of measurements has been acquired. The same method of solar resource evaluation as described in section 4.3 should be followed. Pending economic viability, a hybrid geothermal-solar thermal power facility Newcastle, UT would be the first facility of its kind. The rationale for selecting the optimal working fluid would be as follows.  As shown in Table 7, r-134a had the largest power-to-land ratio. However, it is not recommended as the preferred working fluid. There is minimal “room to grow” in its power cycle on the P-h diagram. The geo-only operating pressure for r-134a is already near its critical pressure.  Depending on the land available, 28 or 57 acres, where the solar field that can be constructed isobutane or isopentane are the recommended working fluids. Both of 76

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

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