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Transforming Waste Heat to Power through Development of a CO2

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Transforming Waste Heat to Power through Development of a CO2 ( transforming-waste-heat-power-through-development-co2 )

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controller, turbo-alternator and power electronics. For convenience of testing, the flue/exhaust gas to CO2 waste heat exchanger was replaced by a heat transfer fluid to CO2 heat exchanger. A slave natural gas-fired system is used to heat and circulate the heat transfer fluid. Water is supplied to the condenser using a conventional cooling tower and circulation pump. Figure 4: System performance model for an Echogen utility scale heat engine integrated to a LM2500 power generation turbine compared to competing waste heat recovery technologies. As part of the AEP Dolan Technology Center, the Walnut Test Facility provides unique research and testing services for various distributed energy resources. Testing can be conducted on generation, energy storage, and power quality devices in the 100kW to 1.5MW scale. Previous testing by others at this AEP facility has included microturbines, fuel cells, advanced batteries, renewable powered equipment, power electronics, and other related equipment, including communications, protection and control equipment and components. Devices may be tested singularly or in combination with other devices and may operate with or without connection to the electric power grid. Interconnection to the AEP distribution system is through a 13.8 kV tap point capable of handling devices up to 1.5MVA and is provided with separate bi-directional metering to distinguish power used by the facility from power that could be exported. The test site includes a low voltage switchgear, metering and protection, low and medium voltage transformation, 250 psi nominal natural gas supply, and onsite water supply for cooling and other needs. Standards based and custom testing are performed using best practices and protocols developed over the 30-year history at AEP's Dolan Laboratory. System testing has successfully progressed through several test phases including initial checkout, shakedown and part load characterization of key system components. During testing, the 250 kW thermal engine has achieved net power output with 80 days of operation and over 85 turbine starts. In future commercial installations, the actual net system power output from the 250 kW thermal engine will range between 200 to 300 kW depending on the size and temperature of the 6

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Transforming Waste Heat to Power through Development of a CO2

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