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Numerical methods for solving complex heat exchanger models in transient operation
Norwegian University of Science and Technology, Faculty of Natural Sciences and Technology, Department of Physics.
2014 (English)MasteroppgaveStudent thesis
Abstract [en]

Heat exchangers are important in many industrial systems. In order to maximize heat transfer while fulfilling requirements to size and weight, it is crucial to have good numerical tools available. Sintef has developed a modelling framework for solving a variety of different heat exchangers in steady-state. This thesis contains the work done to extend the framework with a transient solver. Dynamical aspects of heat exchangers can not be investigated by steady-state solvers, and a transient formulation is needed to explore these phenomena. The transient formulation that has been attempted has proven to form a set of stiff equations. The stiffness is related to the size of the control volumes used by the solver. Furthermore, the transient solver is unable to solve a ”base case” for the reference heat exchanger that has been investigated. In order for the solution to converge, the tube diameters need to be multiplied by a factor of 30. Increasing the tube diameters does not only violate potential size requirements, but it also results in a lower heat transfer. Thus, the transient formulation that is implemented is not robust enough to solve compact heat exchangers.

Place, publisher, year, edition, pages
Institutt for fysikk , 2014. , 71 p.
URN: urn:nbn:no:ntnu:diva-26980Local ID: ntnudaim:10996OAI: diva2:754708
Available from: 2014-10-11 Created: 2014-10-11 Last updated: 2014-10-11Bibliographically approved

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