(Solved): A step change in the steam pressure to a heat exchanger is made from 20 to 24 ...

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A step change in the steam pressure to a heat exchanger is made from 20 to $$24\mathrm{psig}$$. The system outlet temperature response as shown in Figure 1 appears to be approximately second order. Someone forgot, however, to note the recorder speed. A second test of the system using sinusoidal variation of steam pressure to the exchanger with an amplitude of 2 psig and a frequency of 2 cycles/second yields an output temperature variation with amplitude of $$4^{?}\mathrm{F}$$. Determine an approximate transfer function for this system.