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Weather Data Cooling towers are devices that reject heat primarily by evaporating water into the air. As a result, the temperature of the cooling water exiting a cooling tower is a function of the wet bulb temperature of the air at the site. When evaluating cooling tower performance, key data is weather information for the site, particularly wet bulb temperatures throughout the year. Two cities for which appropriate data is available are Reno, NV and Klamath Falls, OR. In comparing Reno and Klamath Falls weather data, Klamath Falls was considered closer to conditions at Lakeview in terms of elevation, precipitation and dry bulb temperature. Bin type dry bulb data with mean coincident wet bulb temperature was used to generate mean monthly wet bulb temperatures for use in simulating cooling tower performance for the site. The following table summarizes both dry and wet bulb mean monthly data. Table 1 Mean Monthly Wet Bulb and Dry Bulb Temperature Data Jan Feb March April May June July Aug Sept Oct Nov Dec DB 28.7 34.5 38.0 41.9 53.5 54.2 67.4 65.7 59.2 45.6 37.1 28.7 WB 26.6 30.7 32.2 35.0 43.1 45.8 53.3 50.1 48.6 38.9 33.5 26.7 Methodology Using the monthly average wet bulb temperature from Table 1, it was assumed the cooling towers could produce an average cooling water temperature exiting the tower of 5°F (open towers) to 7°F (closed towers) above the available wet bulb temperature of the air. A value of 20°F above this temperature was taken as the condenser leaving water temperature. Power plant performance was adjusted based on this leaving water temperature using the known performance at base conditions (175 kW net at 206°F/147°F 300 gpm and 59°F/70°F 800 gpm condensers). Plant output was calculated at each condenser temperature by a direct ratio of the Carnot efficiency at the base conditions to the Carnot efficiency at the monthly condenser temperature. Cooling system parasitic loads for pumps and fans were deducted from the machine output to arrive at an average net power production for each month. They were then totaled for the year to arrive at annual net electricity production values. Cooling tower performance and sizing for peak conditions were based on manufacturer’s (Baltimore Air Coil) selection software. For the well water approach, pump power requirements were based on the assumption of 100 pounds per square inch (psi) delivery pressure and a 100’ lift in the well. Of the total power, it was assumed that 300 gpm was to be delivered in any event to other users and pumping power requirements for this flow were deducted to arrive at a net well pumping power for cooling purposes assigned to the geothermal power plant. Option 1 – 100% Closed Cooling Towers Closed cooling towers, sometimes referred to as fluid coolers, are characterized by the isolation of the process cooling water flow from the air. The water to be cooled passes Lakeview Geothermal Power Generation Facility Feasibility Study 6PDF Image | LAKEVIEW GEOTHERMAL POWER GENERATION FACILITY FEASIBILITY
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