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Experimental and numerical results of a high frequency rotating active magnetic refrigerator |
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| Affiliation: | 1. Department of Mechanical Engineering, University of Engineering and Technology, Lahore, 54890, Pakistan;2. School of Engineering and Materials Science, Queen Mary, University of London, Mile End Road, London E1?4NS, UK;3. School of Materials Science and Engineering, Sichuan University, Chengdu 610065, China;1. Department of Energy Conversion and Storage, Technical University of Denmark, Frederiksborgvej 399, DK 4000 Roskilde, Denmark;2. Mærsk Mc-Kinney Møller Institute, University of Southern Denmark, DK 5230 Odense M, Denmark;1. Department of Energy Conversion and Storage, Technical University of Denmark, Frederiksborgvej 399, 4000, Roskilde, Denmark;2. POLO – Research Laboratories for Emerging Technologies in Cooling and Thermophysics, Department of Mechanical Engineering, Federal University of Santa Catarina, Florianópolis, SC 88040-900, Brazil |
| Abstract: | Experimental results for a recently developed prototype magnetic refrigeration device at the Technical University of Denmark (DTU) were obtained and compared with numerical simulation results. A continuously rotating active magnetic regenerator (AMR) using 2.8 kg packed sphere regenerators of gadolinium (Gd) was employed. With operating frequencies up to 10 Hz and volumetric flow rates up to 600 L h?1, the prototype has shown high performance and the results are consistent with predictions from numerical modelling. Magnetocaloric properties of the Gd spheres were obtained experimentally and implemented in a one-dimensional numerical AMR model that includes also the parasitic losses from the prototype. The temperature span for a thermal load of 200 W as a function of frequency was measured and modelled. Moreover, the temperature span dependence on the cooling capacity as a function of cycle frequency was determined. A detailed study of these parasitic losses was carried out experimentally and numerically. |
| Keywords: | Active magnetic regenerator Magnetic refrigeration Experiment Numerical modelling Parasitic losses analysis Régénérateur actif magnétique Froid magnétique Expérience Modélisation numérique Analyse des pertes parasitiques |
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