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rating of 280 kilowatts and has proven to operate reliably in commercial sites in Alaska, New Mexico and Utah, and at the Oregon Institute of Technology in Klamath Falls. The Pure Cycle 280 unit meets the minimum design criteria, although meeting the winter maximum district heating supply temperature of 190°F will require shutting off power generation below about 30°F ambient air temperature. The turbine is a fixed‐speed, fixed geometry, which does not allow modulation of power production to accommodate varying district heating demands. The turbine‐generator includes an oil‐lubricated gearbox, with a recommended major rebuild interval of 5 years at an estimated cost of $75,000. As a modular pre‐packaged unit, there is no option for air or hybrid‐cooled condensers or use of waste geothermal water for power cycle preheat. The unit uses R245fa as a working fluid, with a typical working pressure of less than 100 psig and an evaporator pressure rating of about 250 psig. Figure 5. Pratt & Whitney PureCycle 280kW Module ElectraTherm Green Machine: ElectraTherm of Reno, Nevada builds a 50 kW module called The Green Machine. It has been tested at the Southern Methodist University and units operate using a solar heat source in Hawaii and at the Kalamazoo Valley Community College in Michigan. The Green Machine unit does not meet the minimum size requirements for the Klamath Falls project. General Electric Calnetix CleanCycle: General Electric entered the marketplace by purchasing a company named Calnetix Power Solutions which developed a 125 kW ORC unit. Calnetix has offices in the UK and in Stuart, Florida. The Calnetix module is called the CleanCycle, and features a high speed (26,500 RPM) turbine‐expander coupled to a high efficiency alternator in one sealed unit, with no gearbox or lubricated bearings. It uses highly efficient magnetic bearings, and thus eliminates lubricating oil that might contaminate the refrigerant working fluid. According to the company website, Calnetix is focused on the heat recovery market, with _________________________________________________________________________________________________________ City of Klamath Falls Evergreen Energy & Brown Engineering Geothermal Power Plant Feasibility Study July 2011 Page 5PDF Image | Klamath Falls, Oregon Geothermal Power Plant Feasibility Study
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