Lecture #21 S15 CBE 217.pptx

Lecture #21 S15 CBE 217.pptx - CBE 217 Lecture#21 Chapter 7...

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CBE 217 Lecture #21 – April 16, 2015 Chapter 7 - Energy 1
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How will you use energy balances? Determine the amount of energy required to vaporize water in a steam boiler, the amount of fuel required to burn, and the system inefficiencies How much energy is required to convert my homemade wine into brandy? How much energy can be produced by the turbines at Oahe Dam? Energy is $$expensive$$
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Energy Types Kinetic Translational energy of a system relative to some frame of reference (typically the Earth’s surface) Potential Energy due to the position in a potential field (gravitational, electromagnetic, etc.) Internal All other energy possessed by a system. Contains things like molecular motion, molecular interactions, molecular vibrations, etc.
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Heat: Energy TRANSFER as a result of temperature difference between a system and it’s surroundings. What is heat? Another sort of material? Shown by Joule to be energy in transition Joule transferred heat to mechanical work
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