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Homework 10 - Model a Valve

# Homework 10 - Model a Valve - i The valve is linear ii The...

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Chemical Engineering Department University of Florida ECH 4323 Process Control Theory HOMEWORK No. 10 1. Exercise 8.2 a, b, c 2. Exercise 8.3 a, b, c 3. Special problem. Modeling of a valve Find the gain constants K v and K Δ P for a model of a fast valve with coefficient C v = 1 gal/psi 0.5 , modeled by the linearized equation q ' ( t ) = K v ! ' ( t ) + k ! P ! P ' ( t ) , where q ' ( t ) = q ( t ) ! q ( t ) , ! ' ( t ) = ! ( t ) ! ! ( t ) , and ! P ' ( t ) = ! P ( t ) " ! P ( t ) . Consider the following cases: a. At steady-state the pressure drop is 4 psi for a lift opening of 20%, and
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Unformatted text preview: i. The valve is linear ii. The valve is of the quick-opening type iii. The valve is of the equal-percentage type with R = 40. b. A steady-state the pressure drop is 4 psi for a lift opening of 40%, and i. The valve is linear ii. The valve is of the quick-opening type iii. The valve is of the equal-percentage type with R = 40....
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