This thesis presents a generic model for crossflow heat exchangers with one fluid mixed, suitable for dynamic process simulation. A finite difference technique is used to formulate the coupled flow and energy solutions for arbitrary transients in pressure drop and temperature. / The solution algorithms are presented in two forms: one-way dependence and two-way dependence: for the constant and variable property version of the model, respectively. Variable time step algorithms are also developed to predict the optimal time step for the finite difference solution. The first one uses a first order predictor method and the second one uses a combined first/second order predictor method. / Finally, the generic model is configured to model the economizer and tubular air preheater of an existing boiler. Steady-state tests validate the numerical solution against available theoretical relations and transient tests investigate the parameters in the solution and time step algorithms to determine their effect on simulation speed and accuracy.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.59591 |
| Date | January 1990 |
| Creators | Vaitekunas, David A. |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Engineering (Department of Mechanical Engineering.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001073577, proquestno: AAIMM63751, Theses scanned by UMI/ProQuest. |
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