Effects of flow balancing on active magnetic regenerator performance. (25th June 2016)

• Record Type: Journal Article
• Authors: Eriksen, D.; Engelbrecht, K.; Bahl, C.R.H.; Bjørk, R.; Nielsen, K.K.
• Is Part Of: Applied thermal engineering. Volume 103(2016:Jun.)
• Page Start: 1
• Page End: 8
• Publication Date: 2016-06-25
• Subjects: Magnetic refrigeration -- Regenerator -- Flow unbalance; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2016.03.001
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: Experiments show large impact of unbalanced flow in active magnetic regenerators. Flow channel resistances inducing unbalanced flow are investigated theoretically. Modeled flow unbalances reveal strong impact on multi-bed magnetic refrigerators. Abstract: Experiments with a recently constructed rotary multi-bed active magnetic regnenerator (AMR) prototype have revealed strong impacts on the temperature span from variations in the resistances of the flow channels carrying heat transfer fluid in and out of the regenerator beds. In this paper we show through numerical modeling how unbalanced flow in the beds decreases the cooling power and COP for a dual bed device. Furthermore, it is shown how resistance variations in multi-bed devices give rise to unbalanced flow in the individual beds and how this decreases cooling powers and COPs of the machines by approximately 30% and 50%, respectively.