Abstract
A linear analytical one-dimensional model is presented. It is used to calculate the frequency response behavior of coolant temperature and/or coolant mass flow on both (primary and secondary) outlet sides of a counterflow shell-and-tube type heat exchanger with respect to perturbations in the corresponding temperature and mass flow parameters at the inlet to the primary and/or secondary side, respectively. To make the heat exchanger model as comprehensive as possible, mass-flow dependent heat transfer coefficients, an exact solution of the heat conduction through the tube walls, and (at least with respect to the coolant mass flow rates) temperature-dependent coolant densities have been taken into account. The resulting digital code TUMHEX has been tested against frequency response measurements on an industrial-size heat exchanger and has shown good results.
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