eml 3100 lec 7

# eml 3100 lec 7 - Thermodynamics UNIVERSITY OF FLORIDA...

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Lecture No. 7 1 UNIVERSITY OF FLORIDA Thermodynamics

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Lecture No. 7 2 UNIVERSITY OF FLORIDA Thermodynamics
Lecture No. 7 3 UNIVERSITY OF FLORIDA Thermodynamics

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Lecture No. 7 4 UNIVERSITY OF FLORIDA Thermodynamics
Lecture No. 7 5 UNIVERSITY OF FLORIDA Thermodynamics

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Lecture No. 7 6 UNIVERSITY OF FLORIDA Thermodynamics
Lecture No. 7 7 UNIVERSITY OF FLORIDA Thermodynamics

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Lecture No. 7 8 UNIVERSITY OF FLORIDA Thermodynamics First Law of Thermodynamics for Closed System Remember what a closed system is? First Law is also called the “Conservation of Energy”. “During an interaction between a system and its surroundings, the amount of energy gained by the system must be exactly equal to the amount of energy lost by the surroundings.” system surroundings
Lecture No. 7 9 UNIVERSITY OF FLORIDA Thermodynamics Energy can cross the boundary of a system in two ways: System Surroundings Heat (+) Work (-) Sign convention: Heat in is +, Heat out is – Work in is – and work out is + (hint: it is + if you can get work out of a student!!)

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Lecture No. 7 10 UNIVERSITY OF FLORIDA Thermodynamics Work is defined as a force moving through a distance. The work interaction can occur in several ways (see your text). Rotating shaft work. Electric current through a resistance. Moving piston in a cylinder. Springs, etc.
Lecture No. 7 11 UNIVERSITY OF FLORIDA Thermodynamics One example of a work interaction that we will see often in this course is “moving boundary work. Piston area = A Total volume = V P = pressure If we keep the P constant as the piston moves to change the volume, then work = PdV PdV is + when the gas is expanding, work will be done by system (the fluid in the cylinder) PdV is – when the gas is contracting (compression).

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Lecture No. 7
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## This note was uploaded on 08/03/2011 for the course EML 3100 taught by Professor Sherif during the Summer '08 term at University of Florida.

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eml 3100 lec 7 - Thermodynamics UNIVERSITY OF FLORIDA...

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