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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Binary power plants also have the flexibility of being either wet cooled or dry cooled. This refers to the functionality of the condenser. A wet cooled condenser has counter current direct contact with the warm water and air. The warm water will be cooled in accordance with the psychrometric chart to the wet bulb temperature as long as equilibrium can be achieved between the water and air. This will produce cool water and is best suited for dry, low relative humidity climates. This cool water is then used in the binary power plant to accept heat from the working fluid to condense it back into a liquid. Wet cooling towers need a water supply because some water is lost in the process. In locations where water is not as readily available, binary power plants can also be dry cooled. This means that they will use air as the medium to accept the heat being rejected from the power cycle. Ambient air temperature must be taken into consideration when designing a dry cooling system. The pressure of the working fluid can be altered in order to promote condensation at the ambient air temperature at the plant site. 1.3 Working Fluid Appropriate working fluid selection for a binary power plant is critical. Selection of the working fluid must consider the resource temperature, condenser type and condenser operating temperature and the thermodynamic properties of the fluid. Some common working fluids used in binary geothermal power plants are isopentane, pentane, isobutane, r-134a and r-245fa. Specific criteria suggested for selecting a working fluid include toxicity of the fluid, stability under high temperature and pressure, boiling point, flash point, latent heat and thermal conductivity (Huang, 2010). 7

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