University of Twente Student Theses


Heat exchanger shape optimization : using adjoint method ansys fluent

Hannink, M.J.M. (2017) Heat exchanger shape optimization : using adjoint method ansys fluent.

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Abstract:Domestic heaters based on combustion of natural gas are often used in the Netherlands for heating households. A heat exchanger is used to extract energy from the flue gases and heat up water. One of the most common designs in these domestic heaters is a pin-fin heat exchanger. To be able to save fuel, as much heat as possible has to be extracted from the flue gasses. Another important performance parameter is the pressure drop. To restrict the amount of electricity required for driving the fan, the pressure drop has to be lowered. In this thesis the shape of the pins inside a pin-fin heat exchanger are optimized, such that the heat transfer is improved while the pressure drop is decreased. To optimize the shape of the pin, Computational Fluid Dynamics analysis can be used to assist the engineer in which shapes lead to a better design. This optimization procedure is very labor intensive and many design iterations are needed. Another way of improving the geometry is by using the adjoint method. With this method sensitivity calculations for certain design variables, such as heat transfer and pressure drop, can be performed on the results of the CFD computations. Based on these sensitivity calculations the shapes can be improved. This method is used in the thesis to optimize the pin shapes.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
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