ERIC Number: EJ849953
Record Type: Journal
Publication Date: 2009
Abstractor: As Provided
Combined Steady-State and Dynamic Heat Exchanger Experiment
Luyben, William L.; Tuzla, Kemal; Bader, Paul N.
Chemical Engineering Education, v43 n1 p39-50 Win 2009
This paper describes a heat-transfer experiment that combines steady-state analysis and dynamic control. A process-water stream is circulated through two tube-in-shell heat exchangers in series. In the first, the process water is heated by steam. In the second, it is cooled by cooling water. The equipment is pilot-plant size: heat-transfer areas of 0.542 and 2.96 m2 and process-water flowrates up to 65 kg/min. The steady-state analysis involves checking energy balances around both hot and cold sides of both heat exchangers after measurements of flowrates, temperatures and pressures have been made. Redundant temperature measurements that do not give exactly the same values require the students to consider data reconciliation methods to ensure theoretically consistent energy balances. Overall heat-transfer coefficients are calculated for both heat exchangers over a range of process-water flowrates. Wilson plots are constructed to determine inside film coefficients, which are compared with predictions of applicable correlations. The dynamic analysis involves step and relay-feedback tests to determine experimental dynamic information for the system. There are two temperature controllers. The first controls the temperature of the process water leaving the heater by manipulating the steam flowrate. The second controls the temperature of the process water leaving the cooler by manipulating the cooling-water flowrate. The dynamic performances of various controller tuning methods are evaluated. Experimental dynamics are compared with dynamic simulations using Aspen Dynamics.
Descriptors: Heat, Experiments, Equipment, Energy, Measurement, Evaluation, Chemical Engineering, Engineering Education, Simulation
Chemical Engineering Education, Chemical Engineering Division of ASEE. P.O. Box 142097, Gainesville, FL 32614. Tel: 352-392-0861; Fax: 352-392-0861; e-mail: firstname.lastname@example.org; Web site: http://cee.che.ufl.edu/index.html
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Authoring Institution: N/A