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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From Figure 25 it is seen that the irradiance levels are almost identical in both locations. The same visual analysis was done on all of the irradiance data that have been recorded at Cedar City. The Cedar City site has data at one minute intervals from July 13, 2010 to the present time with a gap in the data from December 24, 2010 until February 1, 2011. No attempt to compensate for the missing data was made which could give an annual average slightly higher than may actually be. By visual inspection, over this entire time period, the DNI levels were above the design level 22.97%. A similar calculation for the data recorded at Newcastle yielded irradiance levels at or above the design level for roughly 23% of the year. When looking only at November 2011, visual inspection of the Cedar City data indicated adequate irradiance for 16.04% of the time based on a 24-hour day and Newcastle in November was 16.67%. This provided some degree of confidence that irradiance levels in Cedar City and Newcastle can be considered to be similar over the same period of time and that it could be assumed that Newcastle would be nominally the same. A second method, as described in the following paragraph, to evaluate the Cedar City data was by counting every minute that irradiance levels were above the design level. By this method the DNI was above the design level 24.11% of the time. To this point, the discussion has been the design level of irradiance and how long it will be above a specific design point. Recall that the purpose of a hybrid geothermal- solar thermal power plant is to produce electricity at an increased efficiency since the power system has increased enthalpy from the solar energy. The “counting minutes” method of evaluating the solar resource is a more aggressive method because it assumes that when the instantaneous solar irradiance levels are above the design point, the heat transfer fluid instantaneously rises to the required temperature. It is known that heat 53

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