Experimental performance investigation of an active magnetic regenerator subject to different fluid flow waveforms

• Published in: International journal of refrigeration 2017-02, Vol.74, p.38-46
• Main Authors: Teyber, R., Trevizoli, P.V., Niknia, I., Christiaanse, T.V., Govindappa, P., Rowe, A.
• Format: Article
• Language: English
• Subjects: Active magnetic regenerator; Flow control; Fluid dynamics; Fluid flow; Forme d'onde de vitesse; Froid magnétique à température ambiante; Halbach array; Magnetic fields; Room temperature magnetic refrigeration; Régulation de flux; Régénérateur magnétique actif; Simulation; Tableau Halbach; Velocity waveform; Waveforms
• ISSN: 0140-7007; 1879-2081
• DOI: 10.1016/j.ijrefrig.2016.10.001

•A flow control device based on cam actuated valves is implemented on an AMR device.•A no-flow period is used to increase the flow-averaged magnetic field change.•The system is simulated to evaluate waveforms of constant displaced volume.•AMR experiments are conducted and the performance of each waveform is discussed. A flow control mechanism based on cam actuated valves is designed and implemented on an active magnetic regenerator test apparatus. The objective is to overcome the brief low field period of the nested concentric Halbach array by decreasing the fluid blow width, displacing fluid only when the magnetic field is close to the minimum and maximum values. Flow waveforms are simulated to evaluate varying blow durations with the same displaced volume. AMR experiments are performed where the largest ExQ of 1.62 W is obtained with VD = 13.90 cm3 and a diversion ratio of δ = 0.41, demonstrating an 11.2% increase over the sinusoidal waveform.