磁気ヒートポンプの温度差生成および冷凍能力に及ぼす再生器の空隙率の影響

抄録

Magnetic heat pumps are solid refrigerant heat pump devices that use magnetocaloric material (MCM) as a refrigerant. The temperature of an MCM varies in response to changes in the external magnetic field, which is known as the magnetocaloric effect. However, even if a powerful Halbach-type permanent magnet is used, the change in the temperature of an MCM due to a magnetic field change is only several degrees kelvin. Therefore, an active magnetic regenerator cycle is devised, in which an MCM acts as a heat storage unit and a regenerator, and the temperature change is gradually expanded. In order to improve the refrigeration capacity of the magnetic heat pump, two methods can be considered: (1) maximizing the temperature change of the MCM or (2) increasing the frequency of the magnetic heat pump cycle. In this study, the numerical analysis was performed on the effect of porosity of regenerator on temperature span and refrigeration capacity of magnetic heat pump