Colloquium announcement

Faculty of Engineering Technology

Department Thermal Engineering
Master programme Mechanical Engineering

As part of his / her masterassignment

Joost Ridderhof

will hold a speech entitled:

Determining design relations for a magneto caloric device with multiple magneto caloric materials using numerical software.

Date13-06-2017
Time13:00
RoomHT 500B

Summary

The magneto caloric effect(MCE) is a possible way of transporting heat with a minimal ecological impact. This can be done by implementing the MCE in an active magneto caloric regenerator (AMR). From previous research at the Twente University questions are raised concerning the validity of the thermodynamics describing the MCE as found in literature. To prove the thermodynamics a 0D model has been created. The material properties are of great importance to describe the MCE. The Mean Field Theory (MFT) is used to describe the material properties of gadolinium.

The AMR can be used as a heat pump which is modelled in a 2D domain using gadolinium as the MCM. The highly nonlinear behaviour of the MCE requires the use of numerical software. For this assignment Comsol Multiphysics is used. The 2D model is validated by looking at experimental outcomes, where the model is representing the experimental device.

A maximum temperature span is found when using gadolinium as an MCM in a heat pump. In order to increase this temperature span the use of other materials is considered. A material family of Manganese-Iron-Phosphor and Silicon is described by prof.dr.ir. E. Brück. The so-called Brück materials exhibit a giant magneto caloric effect where the usual disadvantages (large hysteresis or physical deformation) are brought back to a minimum.

This material family is implemented into the 2D model. The material properties are described by literature and implemented as such. It appears that this material family can be used as an MCM where the purpose of the heat pump is to transport heat from an infinite cold heat source.