Study on the Heating Performance of a Cascade Active Magnetic Regenerator Based on Numerical Simulations

To address the limitations of magnetic refrigeration and magnetic heat pump systems near room temperature, this study establishes a one-dimensional numerical model of a cascade active magnetic regenerator and examines the key parameters influencing heating performance. The simulation results indicate that a higher flow rate of the heat transfer fluid accelerates the attainment of a steady-state temperature at the hot end. Furthermore, as the flow rate increases, the no-load temperature span initially increases and then decreases, while the heating capacity increases. Reducing the (de) magnetization time and flow time can significantly enhance both the heating capacity and no-load temperature span, achieving values of up to 55.2 W and 29.9 K, respectively, under a 1-1-1-1 s operating sequence. When the Curie temperature interval of LaFeSiH increases, the no-load temperature span first increases and then decreases, reaching a maximum of 40.2 K at a Curie temperature interval of 6 K. Among the four filling length ratios, the optimal heating performance is achieved at a ratio of 2∶2∶2∶2∶7, resulting in a maximum no-load temperature span of 31.2 K and a maximum heating capacity of 64 W.