The invention describes an innovative method for achieving the Rotating Magnetocaloric Effect (RMCE) for application in magnetic refrigeration. In contrast with the Conventional Magnetocaloric Effect (MCE), the RMCE consists in the change in the orientation of a constant intensity magnetic field, as opposed to the change in amplitude of a static orientation magnetic field. By exploiting the demagnetizing effect, the RMCE is attainable by any polycrystalline magnetocaloric sample with an asymmetric shape, in the case of the study, gadolinium.
Currently used refrigeration and heat pumping devices are predominantly based on the vapor-compression principles that use greenhouse gases as the active material and are responsible for 8% of all greenhouse gas emissions. Emerging magnetic refrigeration technology shows promise for domestic and industrial use at room temperature, with potential recognized in both academic and private sectors. This innovation opens avenues for exploring new device architectures, promising cheaper and more efficient solutions.
The technology presented reveals the attainability of the RMCE by any polycrystalline magnetocaloric sample with an asymmetric shape,without requiring magnetocrystalline anisotropy. This offers a broader range of materials to be used, potentially reducing costs of production of materials.
Moreover, conducting direct assessments of the RMCE in gadolinium demonstrates that notable adiabatic temperature change and refrigerant capacity can be achieved at low magnetic field amplitudes. Evidencing that the technology shows good performance at lower magnetic field magnitudes. Employing lower magnetic field intensities in a magnetocaloric heat pump can significantly decrease the need for permanent magnet materials for a similar effect, thereby lowering the overall cost, size, and weight of devices, ultimately improving the feasibility of mass production.
The reffered technology also relies on solid-state materials which do not impact the environment through harmful gas emissions, a more sustainable solution than conventional refrigeration and heat pumping devices employing gas refrigerants.
Refrigeration industry, heat pumping industry, Heating, ventilation and air conditioning (HVAC) systems, cryogenic applications,food and beverage industry, energy efficiency and sustainable technologies.
