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A magnetic field generator (G_(1)) for a magnetocaloric thermal device which comprises first (S_(M11)) and second (S_(M21)) identical magnetizing structures mounted head-to-tail, on either side of a central plane (P) and defining two air gaps (E_(1), E_(2)). Each magnetizing structure (SM_(M11), S_(M12)) comprises first (A_(M1)) and second (A_(M2)) magnetizing assemblies, whose induction vectors are oriented in opposite directions, and mounted on a support (S_(UP1)). Each magnetizing assembly (A_(M1), A_(M2)) has a permanent magnet structure (A_(PI), A_(PC)) which comprises a passive side (F_(P1), F_(P2)) and an active side (F_(A1), F_(A2)), delimiting the air gaps (E_(1), E_(2)). The induction vectors of the first (A_(M1), A_(M19)) and the second (A_(M2), A_(M29)) magnetizing assemblies, form inside the generator, a single circulation loop of a magnetic field through the supports (S_(UP1)) and the air gaps (E_(1), E_(2), E_(3), E_(4)).


Patent
Cooltech Applications | Date: 2014-12-01

A magnetocaloric thermal appliance comprising three coaxial magnetic rotors (R1, R2, R3) rotatable about a rotational axis (R), provided with diametrally opposed magnetic poles (P), aligned with each other, and delimiting air gaps therebetween located in two parallel aft gap planes (PE1, PE2). Two holders (S1, S2) for magnetocaloric elements (M11, M12, M15, M17, M18) are located in the air gap planes. Magnetocaloric elements (M11, M12, M15, M17, M18) are carried by the two holders (S1, S2) and in fluidic communication with each other by at least one heat transfer fluid that circulates in determined fluidic loops (B1). Each fluidic loop (B1) is arranged for connecting, two by two, magnetocaloric elements (M11, M12; M17, M18) that respectively belong to the two holders (S1, S2). The magnetocaloric elements connected two by two are in a same magnetic state and positioned in front of each other.


Patent
Cooltech Applications | Date: 2012-10-24

A magnetocaloric heat generator (1) which comprises at least one magnetocaloric unit (21) provided with at least one magnetocaloric material (3) in thermal contact with a heat transfer fluid (F) and at least one magnetic unit (41) capable of subjecting the magnetocaloric material (3) to a variable magnetic field. This generator (1) is characterized in that each unit (21, 41) has a modular configuration and comprises at least one fitting form (E1, E2, E3) which facilitates assembly with another unit (41, 21), along a same median axis (M), which is provided with a complementary fitting form (E1, E2, E3).


Patent
Cooltech Applications | Date: 2012-11-26

A magnetocaloric heat generator having an assembly of at least two magnetocaloric modules with a heat transfer fluid flowing through them. The cold ends of the modules are in fluidic communication via a cold transfer circuit and the hot ends are in fluidic communication via a hot transfer circuit. The cold transfer circuit is arranged so that the fluid exiting the cold end of one of the magnetocaloric modules with an exit temperature enters the cold end of the other magnetocaloric module with an entry temperature that is substantially equal to the temperature of the cold end. The hot transfer circuit modifies the temperature of the fluid so that the fluid exiting the hot end of one of the magnetocaloric modules with an exit temperature enters the hot end of the other magnetocaloric module with an entry temperature that is substantially equal to the temperature of the hot end.


Patent
Cooltech Applications | Date: 2014-12-22

A thermal appliance having an uneven number of closed primary circuits, each including at least two outlet points connected in series to at least one exchange zone. In each circuit, a primary fluid is circulating in an alternating cycle of period (T) having two displacement phases of a half-period (T/2) having identical flow rates and volumes but in opposite directions. The primary fluid circulation cycle is phase-shifted (by T/2N) between each of the primary circuits. The inlet of the exchange zone is connected unidirectionally to one of the outlet points of each of the primary circuits and the outlet of the exchange zone is connected unidirectionally to the other outlet points of the primary circuits so that the sum of the heat transfer fluid flow rates, entering the exchange zone, is always greater than zero. A method for optimizing the heat exchange of such a thermal appliance.


Patent
Cooltech Applications | Date: 2014-12-22

A magnetocaloric thermal generator having a primary circuit fluidically connecting first and second stages of magnetocaloric elements using a heat transfer primary fluid flowing alternately back and forth. The stages being subjected to variable magnetic field of a magnetic system. The primary system includes a cold side and a hot side to which the magnetocaloric elements of the stages are fluidically connected. At least the cold side of the primary circuit has an outlet point connected to another point of the primary circuit, referred to as the injection point, on the hot side by a bypass pipe allowing the primary fluid to be displaced only from the outlet point towards the injection point. The magnetocaloric thermal generator is used in a method for cooling the secondary fluid.


A one-piece part based on a magnetocaloric material not comprising an alloy comprising iron and silicon and a lanthanide is provided. The part comprises a base in a first plane defined by a first and second direction and a set of N unitary blades secured to the base; the blades having a first dimension in the first direction, a second dimension in the second direction and a third dimension in a third direction at right angles to the first and second dimensions; an ith blade being separated from an (i+1)th blade by an ith distance; the ratio between the second dimension and first dimension being at least 10; the ratio between the third dimension and first dimension being at least 6; the first dimension being the same order of magnitude as the distance separating an ith blade from an (i+1)th blade. A thermal generator comprising one-piece parts is provided.


A one-piece part based on magnetocaloric material comprising an alloy comprising iron and silicon and a lanthanide, comprises a base in a first plane defined by a first and second direction and N unitary blades secured to the base; the blades having a first and second dimension in the first and second direction, respectively, and a third dimension in a third direction at right angles to the first and second dimensions; an ith blade being separated from an (i+1)th blade by an ith distance; the ratio between the second dimension and first dimension being at least 10; the ratio between the third dimension and first dimension being at least 6; the first dimension being the same order of magnitude as the distance separating an ith blade from an (i+1)th blade. The magnetocaloric material can be rare-earth alloy or a composite material based on polymer binder and rare-earth alloy.


Patent
Cooltech Applications | Date: 2014-03-14

A thermal apparatus (1) which comprises at least one primary circuit (P_(1)) in which a heat transfer primary fluid is moved, in a reciprocating movement, by a displacement device, and at least one heat exchange interface (I_(1,1), I_(1,2)), of the primary fluid, in which a secondary fluid that unidirectionally in a secondary circuit (S_(1,1), S_(1,2)). The apparatus is characterized in that the exchange interface (I_(1,1), I_(1,2)) comprises at least one heat exchange zone (Z_(N), N_(N+1), Z_(N), Z_(N+1)) in which the primary fluid and the secondary fluid flow unidirectionally and countercurrent with respect to one another.


Patent
Cooltech Applications | Date: 2013-02-21

A magnetic field generator (1) comprising first (2) and second (3) identical magnetizing structures mounted opposite and parallel to one another, head-to-tail, and defining at least two air gaps (42, 43). Each magnetizing structure (2) comprises first (4) and second (5) diametrically opposite structurally identical magnetizing assemblies which are arranged on either end of a ferromagnetic central part (6). Each magnetizing assembly (4, 5) comprises a polygonal, uniformly magnetized central magnet (7, 14) and laterally surrounded by a uniformly magnetized magnetic belt (13, 20). The magnetic flux, generated by the generator (1), forms a single loop concentrated through the air gaps (42, 43).

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