Lecture #22 S15 CBE 217.pptx - CBE 217 Lecture#22 Energy...

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CBE 217 Lecture #22 – April 21, 2015 Energy balances 7.4-7.6 1
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Flow Work/Shaft Work Shaft work: done by the process fluid on a moving part within the system Flow work: work done by the fluid at the system outlet minus system inlet
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Example An incompressible fluid flows through a horizontal straight pipe. Friction of the fluid within the pipe causes a small amount of heat to be transferred from the fluid. To compensate, flow work must be done on the fluid to move it through the system (so that ) 1. How are V in and V out related? 2. How are P in and P out related?
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Specific Properties Intensive properties: Extensive properties: Specific properties: an intensive property obtained by dividing an extensive property by a total amount Specific volume Specific enthalpy
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Specific Enthalpy Example The specific internal energy of helium at a given 300K and 1 atm is 3800 J/mole. Calculate the specific enthalpy, knowing that the specific molar volume at the T and P is 24.63 L/mole.
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