University of Twente Student Theses


Dynamic modeling of a heat exchanger

Rutgers, J (2016) Dynamic modeling of a heat exchanger.

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Abstract:This internship has been done at Powerspex, at the department R&D, mainly responsible for the development and implementation of dynamic training simulators. These training simulators are built in a program called PsxCad, which is a Java-based program completely developed by Powerspex. My main assignment during this internship consisted of developing a new model for a heat exchanger. The current logarithmic mean temperature difference model does not satisfy, especially during startup situations. The heat capacity is not taken into account in this model and there are also numerical instabilities. Two new models for the heat exchanger were built based on a discretized finite volume method. Both flows and the wall were divided in elements and the laws for mass and energy conservation were applied. The heat capacitance of the wall was included in the calculations as well. The first model is based on iterative calculations of the parameters, while the second model uses the values of the previous time step to calculate the temperature, enthalpy and heat exchange. The results were generated using a demo process model , which uses three different heat counter current heat exchangers. For all three models the outcomes were plotted and the differences investigated. The results showed that model two provided a suitable and stable outcome without losing a lot of computational power. Moreover, the included wall capacitance is visible. The disadvantage of this model is the complexity in comparison with the current model.
Item Type:Internship Report (Master)
Powerspex B.V., the Netherlands
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
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