1. Transient regimes: definition and approaches (unsteady)
1.1 Definition of a transient
A heat exchanger is said to be in a transient or unsteady state when the input variables, and consequently the output variables, are, in part or all, functions of time.
The figure 1 illustrates this definition in the most general form possible. The heat exchanger is considered to be an open system with a transfer interface between the hot and cold media. The magnitude h ( T, P) represents the specific enthalpy as a function of temperature and pressure, and possibly of titre, during a liquid-vapor change of state, and...
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Transient regimes: definition and approaches (unsteady)
Various types of stress and disturbance
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