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Transfer functions for 1-2 pass heat exchangers are obtained in a simplified form relevant to computer programming. In the transfer functions, the distributed temperature responses in the axial direction are related to changesin flow rates of both tube-side fluid and shellside fluid. A good agreement is obtained between the theoretical frequency responses and experimental data.The relations between the outlet temperature responses and the distributed ones are demonstrated both in the frequency-and the time-domains: (1) The frequency transfer functions are illustrated on a complex plane as a function of circular frequency and distance. (2) Using Johnson's method, the time responses of fluid temperature profiles to a step change in flow rate are calculated from the transfer functions.It is shown that the distributed temperature response gives much information on the dynamic behavior of heat exchangers.
公益社団法人計測自動制御学会の論文