LEC 2-thermodynamics

For air are constant within a wide range of

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Unformatted text preview: nstant within a wide range of temperature, therefore it is treated as calorically perfect gas, for which, e and h can be written as: Discussion: and are actually impossible to be constants in the range of (0, ~300K), however, we never dealt with the and , we only interested in there change, (in a relatively high temperature range, at which, and are relatively constant). That means: and are still valid. Useful relations: definition , 1st Law of Thermodynamics (Conservation of Engergy) “Energy can be transformed (changed from one form to another), but cannot be created or destroyed”. For a stationary system: where process, SHU Fall 2012 are heat transferred or work done to the system. For reversible 2 Thermodynamics (Review) LEC 2 Entropy and 2nd Law of Thermodynamics Entropy is a macroscopic property of a system that is a measure of the microscopic disorder within the system. For a reversed process, it is defined as: ∫ 2nd Law of thermodynamics: In general the total entropy of any system will not decrease other than by increasing the entropy of some other system. Hence, in a sys...
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This note was uploaded on 09/03/2013 for the course AE 339 taught by Professor Wei during the Fall '12 term at NMSU.

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