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Engineering Science by Lloyd Dingle, Mike Tooley

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Chapter 13 Thermodynamic systems

13.1 System definitions and properties

A thermodynamic system may be defined as: a particular quantity of a thermodynamic substance (normally a compressible fluid such as a vapour or gas) that is surrounded by an identifiable boundary.

We often talk about the system boundary as the control surface, where the control surface encloses a region in space, the control volume, as follows:

  • a) Inside the space there is a fixed mass of fluid whose behaviour is being investigated.
  • b) Across the space there may be a mass transfer of fluid at the inlet and outlet whose thermodynamic state is changing and is under investigation. ...

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