Performance analysis of a high-efficiency multi-bed active magnetic regenerator device

• DOI: 10.1016/j.applthermaleng.2021.117569
• Publication Date: 2021-09-20T21:26:47Z
• Authors: M. Masche; J. Liang; S. Dall'Olio; K. Engelbrecht; C.R.H. Bahl
• Keywords: Magnetic refrigeration; Solenoid; Solenoid valve; Cooling capacity; Yoke (aeronautics)

We present the performance of an active magnetic regenerator prototype with a multi-bed concept and parallel flow circuit. The applies two-pole permanent magnet (maximum flux density 1.44 T) that rotates over 13 tapered beds mounted on laminated iron yoke ring. Each bed is filled about 262 g spherical particles, distributed in layers ten alloys La(Fe,Mn,Si)13Hy (CALORIVAC HS) different Curie temperatures. Other important features are solenoid valves, monitoring temperatures exiting each at cold side, torque meter used to measure power required drive cycle. opening behavior valves (i.e., blow fraction) could be adjusted correct imbalances bed. device provided maximum cooling 815 W cycle frequency 1.2 Hz, utilization 0.36, hot reservoir temperature 295 K while maintaining 5.6 K-temperature span coefficient 6.0. In this case, second-law efficiency was 11.6%. 20.5%, which represents one largest for magnetocaloric device, obtained 0.5 0.34, 10.3 K. Under these conditions, absorbed load 288 5.7. It also shown unbalanced due hydraulic resistance through can cause side outlet variations, reduce system performance, demonstrating importance well-functioning, balanced system.