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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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various instances that the maximum thermal efficiency for a heat source and sink is given by Equation 13. (13) In this equation, ηcarnot is the maximum efficiency a power cycle can operate at with a heat sink at temperature Tcold and a heat source at temperature Thot. Both Tcold and Thot must be expressed as absolute temperatures, Kelvin or Rankine. It is a misconception to believe that the maximum efficiency of a binary power plant is at Carnot efficiency. Since the heat source of the binary power plants cools as the heat energy is transferred into the working fluid the isothermal heat transfer step of the Carnot cycle does not exist. The maximum efficiency for a binary power plant is known as the trilateral or triangular efficiency. When the Carnot process is sketched on a temperature-entropy diagram it is rectangular in shape and the trilateral process is triangular. The steps in the trilateral cycle are as follows: isentropic expansion, isothermal heat rejection and the simultaneous heating of the working fluid and cooling of the heat source. The efficiency of the trilateral cycle can be calculated by using Equation 14. (14) In Equation 14 ηtrilateral is the trilateral efficiency between a heat source at temperature Thot and a heat sink at temperature Tcold. Once again, the temperatures must be measured on an absolute scale (DiPippo, Ideal thermal efficiency for geothermal binary plants, 2007). 35

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

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