磁気冷凍サイクル高速化に ... - fujikura.co.jp

1 MCM . 1 2 2.. 3 4.. Effects of Magnetocaloric Wire on Increase in Magnetic Refrigeration Cycle M. Kondo, K. Ueno, K. Takeuchi, R. Nomura, and T. Kizaki .. MCM . 10 Hz .. We are working on the development of an environment - friendly, next - generation heat pump focusing on mag- netic refrigeration technology. Conventional magnetic heat pumps, however, have a problem of insufficient cooling power. So we aim to increase the cooling power of magnetocaloric refrigerators by increasing their cycle frequen- cy. To achieve the goal, we have developed a wire - shaped magnetocaloric material (MCM) used in a heat pump by wire drawing, which is one of fujikura 's core technologies. As the result of using the wire - shaped MCM in a heat pump and operating this device at a cycle frequency of 10 Hz, the device achieved the world's top - level specific cooling power in a weak magnetic field. This paper provides the summary of the results.

2 2 . AMR . 1 . AMR . 3 .. 2015 COP 21 MCM. AMR . 1 .. AMR AMR .. MCM MCM .. MCM .. 4 . 50 Hz .. 2 .. MCM MCM . MCM . 5 . mm MCM . Active Magnetic Regenerator MCM .. 6 . 1 AT AMR . 2 AT . 3 .. 4 . 49. 2017 Vol. 1 130 .. Magnetocaloric effect MCM . Magnetocaloric . MCM material Gadolinium . AMR Active Magnetic MCM . Regenerator . S . Tc .. 3 .. 6 7 8 . 3 1 MCM. MCM Gd . MCM .. AMR MCM . MCM MCM MCM 1 . MCM mm . MCM mm 2 . MCM 3 2 MCM . MCM mm Gd . AMR 1 T Sm Tc MPMS . mm Gd 2. Gd Tc Sm J/kg K . J/kg K Tc 2. 3 K Sm . J/kg K . Particle Wire Sm J/kg K . 240 260 280 300 320 340. Temperature K . 1 mm Gd 2 Gd Gd Sm Fig. 1. mm dia. Gd wires. Fig. 2. Sm of Gd wire and Gd particle. 50. MCM . MCM MPa . 4. 3 3 . mm .. 3 4 . 5 6 . MCM .. 3 3 MCM . MCM MCM 1 . a b Piston Hot side Magnet M. Non twisted wires Twisted wires C. Theoretical Theoretical M. porosity 21 % porosity 42 %. 3 a b . Fig. 3. Porosity a non twisted wires b twisted wires.

3 Heater Flow rate of refrigerant m/s . Particle Cold side Nontwisted wire 5 . Twisted wire Fig. 5. Schematic diagram of experimental apparatus. Piston MCM Magnet Contact area between MCM and refrigerant m2 . 4 MPa . Fig. 4. Comparision of flow rate among MCMs in each configuration at MPa. 1 . Table 1. Experiment sample details. Material configrations Particle Twisted wire Twisted wire Diameter of MCM mm Mass of MCM kg Dimentions of bed mm 14 height 14 width 100 length . Porosity % 40 57 49 6 . Fig. 6. Photograph of experimental apparatus. 2. Contact area m 51. 2017 Vol. 1 130 . 2 2 . mm Table 2. Measurement parameters. 40 26 Operation frequency Hz Max 10. Magnetic field T 0 - Flow rate l/min - Refrigerant Water Ambient temperture 200 3 . 42 mm . mm 57 49 .. Speci c cooling power W/kg . 350. Particle Ф mm . T 300. Twisted wire Ф mm . 250 Twisted wire Ф mm . MCM . 200.. 150.. 100.. 50.. 0.

4 MCM 0 2 4 6 8 10 12. Operation frequency Hz . MCM . 7 . Fig. 7. Performance of Gd particle and wires in experimental device. 4 . 7 mm 3 Hz .. mm 5. Hz 1 UNFCCC Press Paris agreement 2015. mm 10 Hz 2 Barclay , Steyert, , Active magnetic regenera- 300 W/kg tor US patent 4,332,135 1981. 3 Prototype of magnetocaloric wine cooler . mm BASF SE CES2015 2015. MCM 4 N. Watanabe : Feasibility study of high frequency mag- netic refrigeration cycle by fast response temperature MCM measurement of magnetocaloric effect of La Fe Si MCM 13, S7 1516 Thermag ,Victoria, BC, 7 - 10 Septem- ber, 2014. 5 Bingfeng Yu, et. al. A review of magnetic refrigerator and heat pump prototypes built before the year 2010 . International journal of refrigeration 33 - 1060 . 2010. 6 , Numerical analysis of recipro- cating active magnetic regenerator made of gadolinium 5 . wires Applied Thermal Engineering 37 388 2012. AMR MCM 7 Hansen, M.

5 Katter : Characterization study of a AMR plate of the magnetocaloric material temperature, The mm Gd 3rd IIF - IIR International Conference on Magnetic Refrig- 3 10 Hz eration at Room Temperature, Des Moines, 2009. 300 W/kg 8 Barbara Pulko, Jaka Tusek : Epoxy - bonded La - Fe - Co - Si magnetocaloric plates, Journal of Magnetism and Magnetic Materials, 375, 65, 2015. 52.