Study of closed systems
Applied thermodynamics - First principle. Energy. Enthalpy

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Study of closed systems


Applied thermodynamics - First principle. Energy. Enthalpy

Author : André LALLEMAND

Publication date: January 10, 2004, Review date: May 28, 2021 | Lire en français

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3. Study of closed systems

One of the applications of thermodynamics is the study of the transformation of thermal energy into mechanical energy (or vice versa) during cyclic transformations of a closed system. In the case of an open transformation of a closed system, the relationships between energy exchanges and variations in state functions are analyzed. In practice, in energy systems, these transformations take place via a compressible or incompressible fluid (or one deemed as such). It is this mass of fluid that constitutes the closed system to be studied.

3.1 Fluid generally at rest

Let's consider a fluid (å ), bounded by any boundary and whose volume evolves from V to V ′ (figure

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