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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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the cooling fluid. Qcool will be equal and opposite of Qcond. In order to keep the size of the condenser to a minimum, it would be ideal to use water as the cooling fluid since it has superior heat transfer properties when compared to air. When water is used as the cooling fluid, after it has accepted the heat rejected by the working fluid, it would typically be sent to a cooling tower. The water is then passed by counter current flow of air allowing some evaporation which cools the water for reuse in accepting heat from the working fluid. If thermodynamic equilibrium can be achieved with the air, the warm water will cool in accordance to an energy balance shown by the psychrometric chart in Figure 13. The dry bulb temperature on the abscissa represents the temperature as measured by a thermometer. Relative humidity represents the percentage of the maximum amount of water that can be evaporated into the air. As the temperature of the air increases, so does its capacity to hold water vapor. The wet bulb temperature is indicated on the 100% relative humidity curve. The wet bulb temperature is the temperature of water in equilibrium with dry air. Consider an example; if the ambient air temperature is 20°C (68°F), the relative humidity is 30% and thermodynamic equilibrium has been achieved between the water and the air, the water would cool to a temperature of approximately 11°C (52°F). In arid climates, water is a precious resource and is often not used as the cooling fluid in geothermal power plants and air is used instead. In this case, the mass flow rate would be much greater because the temperature difference and heat capacity of air are much lower than for water. After the working fluid is cooled to the saturated liquid state, it must be pumped back to high pressure. By the simplified energy balance the work required by the pump can be simplified to the value determined in Equation 8. 28

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

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