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Optimizing Heat Recovery Systems for Power Generation in Rural AK

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Optimizing Heat Recovery Systems for Power Generation in Rural AK ( optimizing-heat-recovery-systems-power-generation-rural-ak )

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other ORC units which usually limited to a low temperature of around 200oF. They can do this, they say, because of their own specially designed refrigerant. They believe that this refrigerant is their key advantage over competitors. In an email response from Jim Olsen, a company representative, it was revealed that they do not actually have any units installed yet as they are a new company. This most likely means that any specifications they are stating are simply theoretical calculations and not actual measured results. The company website says this about the sizing of their units: Systems are sized from 20 kW up to 20 MW+ modules, containing all the equipment required for the units to be operated (i.e. heat exchangers, piping, working fluid feed pump, turbine, electric generator, controls and switch-gear). Larger units are composed of multiple modules, pre- assembled at the factory. The price for a 115 kW unit was quoted as running up to $250,000 for the complete unit. Delivery time is expected to be 6-9 months depending on their fabricator, Concepts NREC, out of Massachusetts. Deluge The Deluge Natural Energy Engine is not an ORC unit but rather a thermo hydraulic engine that produces mechanical energy by heating a fluid so that it expands and moves a piston. The heat source can be solar, geothermal, or waste heat. The main components of the engine are the piston/cylinder and the heat transfer system. The cylinder contains the piston and the working fluid, usually C02. The heat transfer system is made up of heat exchangers and a system to circulate the heat exchange fluid, usually H2O. A three step process creates a back and forth movement of the piston, in turn generating mechanical energy. The technology has been independently verified by university and government studies. In an email from July 2008 they reported they finished building their first 250 kW unit and are shipping it to a jobsite in Hawaii for installation. They claim that 250 kW can be produced from a 150 gpm flow of water at 190oF and that temperature drop through their engine would eliminate the need for the radiator cooling. These flow rate and efficiency numbers are based on calibrated tests in the shop. The price for a 250 kW engine/generator set is $400,000 when buying one at a time. The delivery timeframe is 90 days from purchase order. Ormat Ormat is the world leader when it comes to ORC technology. They have successfully installed ORC units all around the world. They specialize in Geothermal Power, Recovered Energy Generation, and Remote Power Units. Their units range from 200 kW to 22 MW for the Recovered Energy Generations units that cover waste heat recovery. Their remote power units range in size from 200-4500 watts. When given the specifications for a 125 kW diesel generator the company said that the application was too small for their Recovered Energy Generation units. Currently, Ormat is looking into developing a smaller unit that could be used with diesel generators, but as of now none are available. They will let ACEP know if they decide to pursue a smaller unit. Turboden 67

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