Chap6MassEnergyAnalysisofControlVolumes2

Chap6MassEnergyAnalysisofControlVolumes2 - 4 Figure 6.29...

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1 Energy Analysis of Steady-Flow Systems 6.4 Some Steady-Flow Engineering Devices Figure 6.24 A modern land-based gas turbine used for electric power production. This is a General Electric LM5000 turbine. It has a length of 6.2 m, it weighs 12.5 tons, and produces 55.2 MW at 3600 rpm with steam injection.
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2 1 Nozzles and Diffusers Nozzle: is a device that increases the velocity of a fluid at the expense of pressure. Diffuser: is a device that increases the pressure of a fluid by slowing it down. Figure 6.25 Nozzles and diffusers are shaped so that they cause large changes in fluid velocities and thus kinetic energies.
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3 2 Turbines and Compressors Turbines: In steam, gas, or hydroelectric power plants, the device that drives the electric generator is the turbine. The turbine produces work output. Compressors, as well as pumps and fans, are devices used to increase the pressure of a fluid. A compressor is capable of compressing the gas to very high pressures. Compressor takes work input.
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Unformatted text preview: 4 Figure 6.29 Throttling valves are devices that cause large pressure drops in the fluid. h 1 = h 2 u 1 + P 1 v 1 = u 2 +P 2 v 2 Internal energy + Flow energy = Constant 3 Throttling Valves Any kind of flow-restricting devices that cause a significant pressure drop in the fluid. A throttling valve is sometimes called an isenthalpic device. 5 4a Mixing Chambers 4.20 Formal definitions of cv and cp. Figure 6.32 The T-elbow of an ordinary shower serves as the mixing chamber for the hot- and the cold-water streams. 4b Heat Exchangers Heat exchangers are devices where two moving fluid streams exchange heat. Heat exchanges are widely used in various industries, and they come in various designs. Double pipe heat exchanger 6 5 Pipe and Duct Flow 6.39 Heat losses from a hot fluid flowing through an uninsulated pipe or duct to the cooler environment may be very significant. Figure 6.40 Pipe or duct flow may involve more than one form of work at the same time....
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This note was uploaded on 01/28/2009 for the course ENGR 2640 taught by Professor Gregnaterer during the Spring '09 term at UOIT.

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Chap6MassEnergyAnalysisofControlVolumes2 - 4 Figure 6.29...

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