A versatile magnetic refrigeration test device

Bahl, Christian; Petersen, Thor Ugelvig; Pryds, Nini; Smith, Anders

doi:10.1063/1.2981692

Cited by 73 publications

(59 citation statements)

References 14 publications

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“…9,28,29 The magnetic field is generated by a cylindrical Halbach magnet assembly, see tions of the thermocouples on the plate in the model. The applied field used in the model is given in Fig.…”

Section: Methodsmentioning

confidence: 99%

Measuring the effect of demagnetization in stacks of gadolinium plates using the magnetocaloric effect

Lipsø

Nielsen

Christensen

et al. 2011

Journal of Magnetism and Magnetic Materials

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The effect of demagnetization in a stack of gadolinium plates is determined experimentally by using spatially resolved measurements of the adiabatic temperature change due to the magnetocaloric effect. The number of plates in the stack, the spacing between them and the position of the plate on which the temperature is measured are varied. The orientation of the magnetic field is also varied. The measurements are compared to a magnetostatic model previously described.The results show that the magnetocaloric effect, due to the change in the internal field, is sensitive to the stack configuration and the orientation of the applied field. This may have significant implications for the construction of a magnetic cooling device.

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Section: Methodsmentioning

confidence: 99%

Measuring the effect of demagnetization in stacks of gadolinium plates using the magnetocaloric effect

Lipsø

Nielsen

Christensen

et al. 2011

Journal of Magnetism and Magnetic Materials

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“…A modular device built originally for use as an active magnetic regenerator test machine [27] is used to test the stacks as passive thermal regenerators;…”

Section: Periodic Flow Test Machine Setupmentioning

confidence: 99%

Degradation of the performance of microchannel heat exchangers due to flow maldistribution

Nielsen

Engelbrecht

Christensen

et al. 2012

Applied Thermal Engineering

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The effect of flow maldistribution on the performance of microchannel parallel plate heat exchangers is investigated using an established single blow numerical model and cyclic steady-state regenerator experiments. It is found that as the variation of the individual channel thickness in a particular stack (heat exchanger) increases the actual performance of the heat exchanger decreases significantly, deviating from the expected nominal performance. We show that this is due to both the varying fluid flow velocities in each individual channel and the thermal cross talk between the channels transverse to the direction of the flow.

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“…With this requirement in mind, the study of the material's response under prototypical operating conditions becomes increasingly important (Kuz'min, 2007;Lyubina et al, 2010;Lyubina, 2011;Bahl et al, 2008;Moore et al, 2009Moore et al, , 2013Nielsen and Engelbrecht, 2012;Legait et al, 2014). An experimental characterization technique that is able to simulate real working conditions will therefore offer invaluable information about the reproducibility and dynamic response of a magnetocaloric material (Franco et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Influence of thermal conductivity on the dynamic response of magnetocaloric materials

Porcari

Morrison

Cugini

et al. 2015

International Journal of Refrigeration

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We compare the magnetocaloric effect of samples prepared with different thermal conductivities to investigate the potential of composite materials. By applying the magnetic field under operating conditions we test the material's response and compare this to heat transfer simulations in order to check the reliability of the adiabatic temperature change probe used. As a result of this study we highlight how the material's thermal conductivity influences τ , the time constant of temperature change. This parameter ultimately limits the maximum frequency of a refrigerant cycle and offers fundamental information about the correlation between thermal conductivity and the magnetocaloric effect.

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A versatile magnetic refrigeration test device

Cited by 73 publications

References 14 publications

Measuring the effect of demagnetization in stacks of gadolinium plates using the magnetocaloric effect

Measuring the effect of demagnetization in stacks of gadolinium plates using the magnetocaloric effect

Degradation of the performance of microchannel heat exchangers due to flow maldistribution

Influence of thermal conductivity on the dynamic response of magnetocaloric materials

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