Abstract
A computational method is presented for obtaining the steady-state temperature responses of bayonet-type heat exchangers subject to sinusoidal flow rate changes of large amplitude. The frequency- and amplitude-dependent describing functions between the input sinusoidal flow rate changes and the fundamental component of the steady-state response of the outlet temperature of tube-side of shell-side fluid are also derived. Numerical examples are given and the effects of the amplitude of the flow rate changes on the frequency responses are shown: (1) The vector loci of the describing functions are illustrated. (2) The dc-components of the periodic responses are plotted for various values of the amplitude. Finally the responses calculated by the present method are confirmed by means of the Runge-Kutta-Gill method, and it is shown that the present method can reduce the computation time remarkably.
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