Energy analysis of open systems

Energy analysis of open systems - Objectives Develop the...

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2 Objectives Develop the conservation of mass principle and apply to steady- and unsteady-flow control volumes. Apply the first law of thermodynamics as the statement of the conservation of energy principle to control volumes. Identify the energy carried by a fluid stream crossing a control surface and to relate the combination of the internal energy and the flow work to the property enthalpy. Solve energy balance problems for common steady-flow devices such as nozzles, compressors, turbines, throttling valves, mixers, heaters, and heat exchangers. Apply the energy balance to general unsteady-flow processes such as the charging and discharging processes.
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3 Conservation of mass principle for an ordinary bathtub. In a rate form Multiple inlets and exits
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4 Conservation of mass principle for a two- inlet one-outlet steady- flow system. Multiple inlets and exits Single stream Many engineering devices such as nozzles, diffusers, turbines, compressors, and pumps involve a single stream (only one inlet and one outlet). 0 / dt dm CV
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