7Energy and Energy Balancesx

7Energy and Energy Balancesx - CHEE 2331 Chemical Processes...

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CHEE 2331 Chemical Processes Chemical Processes Energy and Energy Energy and Energy Balances Balances Chapter 7, pages 313 Chapter 7, pages 313 - - 333 333 Department of Chemical and Department of Chemical and Biomolecular Biomolecular Engineering Engineering
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What is energy? The ability to do work Energy units (F-L) Mechanical Thermal Metric erg cal Engineering ft-lbf BTU S.I. J J
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Thermodynamic system… System Boundary Surroundings No mass flow over the boundary – closed system However, energy may flow over the boundary Two forms: work (W) – movement of a force through a distance heat (Q) - flow from a higher temperature W (+) Q (+) Note: W and Q are energy in transit, they exist only when they flow and are not properties
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Thermodynamic system… System Boundary Surroundings W (+) Q (+) Energy of the system: External (property of the system as a whole), E ext kinetic (mv 2 /2) potential (mgz/g c ) (electromagnetic) (surface) Internal (property of the material), U electronic atomic molecular nuclear
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Thermodynamic system… System Boundary
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This note was uploaded on 04/15/2010 for the course CHEE 2331 taught by Professor Alim during the Spring '08 term at University of Houston.

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7Energy and Energy Balancesx - CHEE 2331 Chemical Processes...

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