Magnetic heat pumping

Details Magnetic heat pumping Magnetic heat pumping

1976-11-30

1978-01-17

King, Lloyd L.

Refrigeration

Using electrical or magnetic effect

Thermoelectric; e.g., peltier effect

F25B 2102

Patent

active

040690288

ABSTRACT:
The method of the invention employs ferromagnetic or ferrimagnetic elements, preferably of rare-earth based material, for example, gadolinium, and preferably employs a regenerator. The steps of the method comprise controlling the temperature and applied magnetic field of the element to cause the state of the element as represented on a temperature-magnetic entropy diagram repeatedly to traverse a loop. The loop may have a first portion of concurrent substantially isothermal or constant temperature and increasing applied magnetic field, a second portion of lowering temperature and constant applied magnetic field, a third portion of isothermal and decreasing applied magnetic field, and a fourth portion of increasing temperature and constant applied magnetic field. Other loops may be four-sided, with, for example, two isotherms and two adiabats (constant entropy portions). Preferably, a regenerator may be employed to enhance desired cooling or heating effects, with varied magnetic fields or varying temperatures including three-sided figures traversed by the representative point.

REFERENCES:
patent: 2589775 (1952-03-01), Chilowsky
patent: 2619603 (1952-11-01), Chilowsky
patent: 3790829 (1974-02-01), Roth
patent: 4033734 (1977-07-01), Steyert, Jr.

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