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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considered, there is still some thermal storage available in the heat transfer fluid. Throughout this thesis, the design level of 750 W/m2 was mentioned multiple times, but at peak hours of daylight hours, the DNI can be as high as 1,000 W/m2. This would increase the temperature of the heat transfer fluid. As long as the heat transfer fluid does not reach its flash point it would be appropriate to store some thermal energy in the heat capacity of the heat transfer fluid. This would allow for increased production when there is intermittent cloud cover and for a brief period of time after the sun sets, as long as the heat transfer fluid remains at or above the temperature required to evaporate the working fluid at its increased pressure. 5.4 Selection of Working Fluid Many criteria were previously indicated (Section 1.3) for selecting a working fluid for a binary power plant. These same criteria will be used in the selection of a working fluid for use in the Newcastle, UT hybrid geothermal-solar thermal power plant. The criteria are toxicity of the fluid, fluid stability at high temperature and pressure, the fluid’s boiling point at varying pressures, the fluid’s flash point, its specific heat, thermal conductivity and latent heat. The number for toxicity was calculated based on Material Data Safety Sheets (MSDS) for each working fluid. The categories which were taken into account were inhalation, eye irritant, skin irritant and ingestion safety. One mark was given for each category where there was a negative impact and the sum of those marks makes up the toxicity score. The flash point was also recorded based on the fluid’s MSDS. The boiling point pressure, liquid thermal conductivity and latent heat were all calculated using the Refprop 9 program. The boiling point pressure was based on the 61

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