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TA 4.R: Supercritical Carbon Dioxide Brayton Cycle Fatigue Foil Gas foil bearing Gearbox Heat transfer driving force Hydrodynamic oil bearing Hydrostatic bearing Indirect-fired Investment casting Isentropic efficiency Labyrinth seal The weakening of a material caused by repeatedly applied loads. It is the progressive and localized structural damage that occurs when a material is subjected to cyclic loading.50 A very thin sheet of metal, usually made by hammering or rolling. Foils are most easily made with malleable metals, such as aluminum, copper, tin, and gold. Foils usually bend under their own weight and can be torn easily.50 A shaft is supported by a compliant, spring-loaded foil journal lining. Once the shaft is spinning fast enough, the working fluid pushes the foil away from the shaft so that there is no contact. The shaft and foil are separated by the working fluid's high pressure which is generated by the rotation which pulls gas into the bearing via viscosity effects.50 A set of gears with its casing that connects a high-speed shaft (the turbine drive shaft) to a low-speed shaft having the rotational speed required by the generator to produce electricity.53 In a heat exchanger, the driving force that determines the heat flux is the temperature difference between the hot side and the cold side. A type of fluid bearing that relies on the high speed of the journal (the part of the shaft resting on the fluid) to pressurize the oil in a wedge between the faces.50 Hydrostatic bearings are externally pressurized fluid bearings, where the fluid is usually oil, water, or air, and the pressurization is done by a pump.50 Refers to a thermal power cycle in which heat is added to the working fluid indirectly by the heat source via heat exchange. A technique for making small, accurate castings in refractory alloys using a mold formed around a pattern of wax or similar material which is then removed by melting.54 A parameter to measure the degree of degradation of energy in steady-flow devices. For a compressor, the isentropic efficiency is the work required to compress a fluid with no change in entropy divided by the work required to compress a fluid in a real device. For a turbine, the isentropic efficiency is the work generated by the expansion of a fluid in a real device divided by the work generated by the expansion of a fluid with no change in entropy.55 A type of mechanical seal that provides a tortuous path to help prevent leakage. An example of such a seal is sometimes found within an axle's bearing to help prevent the leakage of the oil lubricating the bearing.50 26 QuadrennialTechnologyReview2015PDF Image | Advancing Clean Electric Power Technologies
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