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Unformatted text preview: introducing a step change of 10% in an input variable. Suggest the form of a reasonable transfer function model for each of the four processes. It is not necessary to actually determine the numerical values of the model parameters. Problem 4 (30 points) A control valve is placed in series with a heat exchanger, as shown in the schematic diagram below. The following information is available: 1. The pump discharge pressure, P 1 , remains constant at 45 psig; pressure P 2 is constant at 0 psig. 2. The specific gravity of the liquid flowing through the line is 1.0. 3. At the nominal operating conditions, the valve stem position is l = 0.5, the flow rate is q = 160 GPM, and the pressure drop across the control valve is P v = 16 psig. 4. The pressure drop across the heat exchanger, P he , is proportional to q 2 . 5. The control valve has quick opening trim. What is the flow rate q when the valve position is l =0.4?...
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This note was uploaded on 07/12/2009 for the course CHE 162A taught by Professor Seborg during the Fall '08 term at UCSB.
- Fall '08
- Chemical Engineering