20.500.12556/RUL-134664 Novel design of a high efficiency multi-bed active magnetic regenerator heat pump Nouvelle conception d’une pompe à chaleur à régénérateur magnétique actif à lits multiples et à haut rendement The design of a rotary active magnetic regenerator heat pump device with a multi-bed concept is presented. Important design features are the rotating two-pole magnet assembly, the laminated iron ring, the 13 fixed tapered regenerator beds, and the dynamically adjustable parallel flow circuit. The optimized magnet design was developed with optimally shaped segments and optimum remanence for the desired magnetic field distribution oscillating between 0 and 1.44 T in the air gap. The iron ring was laminated to reduce the eddy currents, allowing the device to run at cycle frequencies up to 3 Hz. The design of the regenerator housing was optimized with respect to parasitic losses and even flow distribution in both directions. Employing 3.4 kg of La(Fe,Mn,Si)13Hy (CALORIVAC HS) refrigerant and at a hot reservoir temperature of 295 K and a cycle frequency of 0.5 Hz, the heat pump achieved a maximum second-law efficiency of 20.6 %, while providing a heating load of 340 W with a heating COP of 6.7 at a 10.3 K span. The COP values presented only consider the magnetic power and ideal pump power delivered to the AMR, neglecting the pump efficiency. At 1.2 Hz, the device produced a maximum heating power of 950 W while maintaining a 5.6 K span, resulting in a heating coefficient of performance and second-law efficiency of 7.0 and 11.6 %, respectively. The performance demonstrated in this paper could be an important milestone in the development of future magnetocaloric devices. magnetic refrigeration magnetocaloric effect heat pumps active magnetic regenerators magnetno hlajenje magneto-kalorični učinek toplotne črpalke aktivni magnetni regeneratorji true false true Angleški jezik Slovenski jezik Članek v reviji 2022-01-25 08:27:55 2022-01-25 08:27:59 2022-09-13 03:56:24 0000-00-00 00:00:00 2021 0 0 Str. 243-254 Vol. 132 Dec. 2021 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.57 0140-7007 10.1016/j.ijrefrig.2021.09.007 94222595 RAZ_DallʹOlio_Stefano_2021.pdf RAZ_DallʹOlio_Stefano_2021.pdf 1 D660C01AB6520E173069A5F9D210A765 4d27031f57e818d448a92e7b8c8b5c88658bc1df7f2b1e773c3a885649042790 926745b2-7db1-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=153216 https://www.sciencedirect.com/science/article/pii/S0140700721003650 1 1ed8501f-7db0-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=153215 Fakulteta za strojništvo 0 0 0