II. Modelling of a Heat ExchangerTwo models for two different control schemes are developed for a parallel flow heat exchanger. First by spatially lumping a heat exchanger model, a good approximate model which has a high system order is produced. Model reduction techniques are applied to these obtain low order models that are suitable for dynamic analysis and control design. The simulation method is discussed to ensure a valid simulation result.

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The results presented in this paper demonstrate that good reduced order models can be obtained directly by recursive parameter identification using I/O data of high order nonlinear systems.

A modeling approach for linear isentropic flow systems based on the quasi-one dimensional Euler equations of non-viscous, compressible flow is presented.Such systems are representative of certain high speed propulsion systems. Accurate models useful in control system studies are developed.A supersonic inlet is considered and the resulting set of partial differential equations with boundary conditions is solved for a linear transfer matrix using Laplace transforms.