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Klamath Falls, Oregon Geothermal Power Plant Feasibility Study

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Klamath Falls, Oregon Geothermal Power Plant Feasibility Study ( klamath-falls-oregon-geothermal-power-plant-feasibility-stud )

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9. Single 350 kW Magnetic Bearing Turbine/Generator Module The initial idea behind implementing the magnetic bearing turbine/generator system was that it would increase efficiency and decrease cost. This proposed system represents a potential improvement to the current state of the art through use of a high speed direct‐drive generator, eliminating the need for gearing and reducing maintenance costs. The proposed system would also be designed to operate at part load conditions, providing greater power generation potential than the UTC unit which operates only at or near full load. Projected capital costs for the magnetic bearing generator turned out to be higher than anticipated because of the need for a custom built refrigerant turbine and the uncertainty of costs to assemble a custom power module. In particular, it has been difficult to obtain firm quotes for the cost of refrigerant heat exchangers. The preliminary capital cost estimate totals about $1.9 million. Brian Brown Engineering has estimated the annual net power production to be in the range of 1,750 megawatt‐hours per year. The annual revenue generated is estimated at nearly $105,000. 9a. Capital Cost Estimate­350 kW Magnetic Bearing Turbine/Generator Module A preliminary estimate of the cost to develop and construct the project with the magnetic bearing turbine/ generator module has been completed. These costs include the permitting, engineering and contract applications and negotiations necessary to place the system in service. The estimated cost of the generator module was based on estimates of the engineering and design cost of the module, cost of various turbine, generator, heat exchanger and control components and assembly costs. Since this would be a single‐unit, custom design, the costs may be higher than that associated with the purchase of a commercially produced module (such as the PureCycle unit). The potential for improved performance and equipment longevity prompted the investigators to pursue this option. A summary of these capital cost estimates is presented below. _________________________________________________________________________________________________________ City of Klamath Falls Evergreen Energy & Brown Engineering Geothermal Power Plant Feasibility Study July 2011 Page 17

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