TY - GEN

T1 - The influence of non-magnetocaloric properties on the AMR performance

A1 - Nielsen,Kaspar Kirstein

A1 - Bahl,Christian

A1 - Smith,Anders

A1 - Engelbrecht,Kurt

A1 - Olsen,Ulrik Lund

A1 - Pryds,Nini

AU - Nielsen,Kaspar Kirstein

AU - Bahl,Christian

AU - Smith,Anders

AU - Engelbrecht,Kurt

AU - Olsen,Ulrik Lund

AU - Pryds,Nini

PY - 2012

Y1 - 2012

N2 - The performance of Active Magnetic Regenerators (AMR) does not depend solely on the magnetocaloric effect of their constituents. Rather, it depends on several additional parameters, including, magnetic field, geometry (hydraulic diameter, cross-sectional area, regenerator length etc.), thermal properties (conductivity, specific heat and mass density) and operating parameters (utilization, frequency, number of transfer units etc.). In this paper we focus on the influence of three parameters on regenerator performance: 1) Solid thermal conductivity, 2) magnetostatic demagnetization and 3) flow maldistribution due to geometrically non-uniform regenerators.<br/>It is shown that the AMR performance is optimal at an intermediate value of the solid thermal conductivity for many operating conditions. The magnetostatic demagnetization is shown to have a significant influence on the AMR performance, giving a strong dependence on the orientation of the applied field and the regenerator geometry. Finally, the flow maldistribution of non-uniform regenerator geometries is found to degrade the AMR performance even at minor deviations from perfectly homogeneous regenerator matrices.<br/>

AB - The performance of Active Magnetic Regenerators (AMR) does not depend solely on the magnetocaloric effect of their constituents. Rather, it depends on several additional parameters, including, magnetic field, geometry (hydraulic diameter, cross-sectional area, regenerator length etc.), thermal properties (conductivity, specific heat and mass density) and operating parameters (utilization, frequency, number of transfer units etc.). In this paper we focus on the influence of three parameters on regenerator performance: 1) Solid thermal conductivity, 2) magnetostatic demagnetization and 3) flow maldistribution due to geometrically non-uniform regenerators.<br/>It is shown that the AMR performance is optimal at an intermediate value of the solid thermal conductivity for many operating conditions. The magnetostatic demagnetization is shown to have a significant influence on the AMR performance, giving a strong dependence on the orientation of the applied field and the regenerator geometry. Finally, the flow maldistribution of non-uniform regenerator geometries is found to degrade the AMR performance even at minor deviations from perfectly homogeneous regenerator matrices.<br/>

KW - active magnetic regenerators

BT - Proceedings of the fifth IIF-IIR International Conference on Magnetic Refrigeration at Room Temperature

T2 - Proceedings of the fifth IIF-IIR International Conference on Magnetic Refrigeration at Room Temperature

ER -