Experimental performance investigation of an active magnetic regenerator subject to different fluid flow waveforms. (February 2017)

• Record Type: Journal Article
• Authors: Teyber, R.; Trevizoli, P.V.; Niknia, I.; Christiaanse, T.V.; Govindappa, P.; Rowe, A.
• Is Part Of: International journal of refrigeration. Volume 74(2017:Feb.)
• Page Start: 38
• Page End: 46
• Publication Date: 2017-02
• Subjects: Active magnetic regenerator -- Room temperature magnetic refrigeration -- Halbach array -- Velocity waveform -- Flow control; Régénérateur magnétique actif -- Froid magnétique à température ambiante -- Tableau Halbach -- Forme d'onde de vitesse -- Régulation de flux; Refrigeration and refrigerating machinery -- Periodicals; 621.56
• DOI: 10.1016/j.ijrefrig.2016.10.001
• Languages: English
• ISSNs: 0140-7007

Abstract

Highlights: 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. Abstract: 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 Ex Q of 1.62 W is obtained with V D = 13.90 cm 3 and a diversion ratio of δ = 0.41, demonstrating an 11.2% increase over the sinusoidal waveform.