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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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temperature of known hydrothermal resource temperatures. This chart was first published in the USGS circular 726 when the data were first collected. This gives great opportunity to the hybridized geothermal-solar thermal power plant because most of the known reservoirs have low temperatures. A binary cycle power plant could be constructed and augmented with solar thermal energy to produce power at increased efficiency. 1.2 Benefits of Binary Power Plants There are some great advantages to binary power plants. In particular, binary power plant technology was developed for low-temperature geothermal systems. Chena Hot Springs, AK is a well-known example where there is low temperature geothermal power production in a binary power plant. At Chena Hot Springs the geothermal temperature resource is only 74°C (165°F). This is below the boiling point of water so it cannot produce steam to be used in a flash power plant. Chena Hot Springs uses binary power plant technology and r-134a was selected as the working fluid. This was selected because the boiling temperature is much lower than that of water (Resort, 2011). There are still some emissions from dry steam and flash plants. They vent coproduced carbon dioxide and hydrogen sulfide into the atmosphere, albeit at a much lower rate than traditional coal or natural gas fired power plants. This is another aspect where binary power plants differ because all produced fluids, including carbon dioxide and hydrogen sulfide, are kept on a closed loop. This means that all produced carbon dioxide and hydrogen sulfide is injected back into the formation and none of these gasses are released into the atmosphere. 6

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

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