Consider the first-order transfer function model in Exercise 4.2 where y and u are deviation variables. For an initial condition of y(O) = 1 and a step change in u of magnitude 2 (at t = 0), calculate the response, y(t). Hint: First determine the corresponding differential equation model by using the inverse Laplace tranform.

CHE 481 Week 6 Notes Estimation of Capital Cost – Chapter 7 Economic Plant Design • PFD includes (stream table & equipment summary) • Next 4 chapters, use PFD for estimating : 1. Capital cost needed to build a new chemical plant 2. Operating cost needed to operate a chemical plant 3. Combine Capital & Operating cost to estimate profitability 4. Select “best process” from competing alternatives 5. Economics of change & modifications to existing plant 1 CLASSIFICATIONS OF CAPITAL COST ESTIMATES Five accepted classifications of capital cost estimates: 1) Order 0f Magnitude Estimate ( ratio or feasibility ) • Capital Cost from previous plants • Adjust for scale & inflation • Diagram : BFD • Least accurate + 40% , -20% 2. Study Estimate