Lect11ME200Divs2&5uhEvalEnergyBalanceSP2012

Lect11ME200Divs2&5uhEvalEnergyBalanceSP2012 - ME...

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ME 200: Thermodynamics I Lecture 11: Internal Energy and Enthalpy Evaluation, Energy Balance
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Last Lecture Enthalpy » a property defined for convenience (h = u + Pv) » useful in open system analysis Property Tables » measured properties listed in different tables for saturated conditions, compressed liquid conditions and superheated vapor conditions » useful instead of complicated relationships
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This Lecture Thermodynamic Property Evaluation: Internal Energy and Enthalpy Energy Balances Using Property Tables
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Property Evaluation Determine what is the state of the substance (CL, SL, SLVM, SV, SHV) Think about what independent properties are available Select appropriate table (if not, need to implement suitable approximation) Make sure that you look up properties with consistent reference states – otherwise the analysis will be wrong!
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Example 1 A rigid tank contains 50 kg of saturated liquid water at 90°C. Determine the pressure, the volume in the tank,
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This note was uploaded on 01/26/2012 for the course ME 200 taught by Professor Gal during the Spring '08 term at Purdue University-West Lafayette.

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Lect11ME200Divs2&5uhEvalEnergyBalanceSP2012 - ME...

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