F - Mech Eng,Light,Heat,Weapons – 25 – B
Patent
F - Mech Eng,Light,Heat,Weapons
25
B
F25B 21/00 (2006.01) H01F 1/01 (2006.01)
Patent
CA 2136533
In an active magnetic regenerator apparatus having a regenerator bed of material exhibiting the magnetocaloric effect, flow of heat transfer fluid through the bed is unbalanced, so that more fluid flows through the bed from the hot side of the bed to the cold side than from the cold side to the hot side. The excess heat transfer fluid is diverted back to the hot side of the bed. The diverted fluid may be passed through a heat exchanger to draw heat from a fluid to be cooled. The apparatus may be operated at cryogenic temperatures, and the heat transfer fluid may be helium gas and the fluid to be cooled may be hydrogen gas, which is liquified by the device. The apparatus can be formed in multiple stages to allow a greater span of cooling temperatures than a single stage, and each stage may be comprised of two bed parts. Where two bed parts are employed in each stage, a portion of the fluid passing from the hot side to the cold side of a first bed part which does not have a magnetic field applied thereto is diverted back to the cold side of the other bed part in the stage, where it is passed through to the hot side. The remainder of the fluid from the cold side of the bed part of the first stage is passed to the hot side of the bed part of the second stage. The fluid flowing from the cold side of a bed part of the second stage is partly passed to the cold side of the second bed part of the second stage and partly diverted back to the hot side of the first stage through a heat exchanger which draws heat from a fluid to be cooled.
Degregoria Anthony J.
Janda Dennis J.
Jastrab Alexander G.
Johnson Joseph W.
Lubasz Richard A.
Astronautics Corporation Of America
Borden Ladner Gervais Llp
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