Temperature-control assembly

Abstract

The invention relates to a temperature-control assembly (1) having a heat source (3) and a heat sink (5), wherein the heat source (3) absorbs heat from a magnetocaloric circuit (10) via a heat exchanger (18) and releases same to the outside, and the heat sink (5) releases heat absorbed from the outside to the magnetocaloric circuit (10) via a heat exchanger (18). The magnetocaloric circuit (10) comprises a closed channel system (14) for conducting a magnetocaloric medium (12), one of the heat exchangers (18) is designed as a heat exchanger (18A) into which a magnet device (16) and a magnetohydrodynamic pump module (20) are at least partly integrated, said pump module comprising an electrode device (22) which conducts an electric current through the magnetocaloric medium (12) at a channel portion (15) of the channel (14A) such that a Lorentz force is produced by the interaction with a magnetic field generated by the magnet device (16), said Lorentz force controlledly accelerating the magnetocaloric medium (12), and a resulting pressure build-up brings about a desired volume flow of the magnetocaloric medium (12) through the channel (14A), said magnetocaloric medium (12) being heated upon entering the magnetic field and cooled upon exiting the magnetic field.

Description

[0001] Description

[0002] title

[0003] Temperature control arrangement

[0004] The invention relates to a temperature control arrangement.

[0005] Magnetohydrodynamics (MHD) is a subfield of physics. It describes the behavior of electrically conductive fluids that are penetrated by magnetic and electric fields. Magnetohydrodynamics in the narrower sense deals with liquids, especially plasmas, which are described as fluids within the framework of MHD. Typical applications of magnetohydrodynamics include flow control and flow measurement in metallurgy and semiconductor single-crystal growth. In metallurgy, for example, magnetic fields can be used to influence the flow of liquid metals, such as steel or aluminum. A distinction is made between static and time-dependent magnetic fields. Static, i.e., time-independent, magnetic fields dampen turbulence and are therefore used, for example, in the form of magnetic brakes in the continuous casting of steel.Time-dependent magnetic fields are used, for example, for electromagnetic support during the casting of aluminum.

[0006] The magnetocaloric effect describes the phenomenon of a temperature increase in a magnetizable material when exposed to a stronger magnetic field. The effect is reversible, manifesting as a decrease in temperature as a consequence of a weakening magnetic field. This means that magnetocaloric fluids change their physical properties, such as their temperature, when exposed to an external magnetic field. WO 2006 / 136041 A1 discloses a cooling device and a heat pump that use a magnetocaloric fluid as a refrigerant. The cooling device and the heat pump comprise a hot circuit and a cold circuit for transporting the magnetocaloric fluid, which contains magnetocaloric particles as a carrier fluid. The hot circuit includes a magnet for generating a magnetic field, a first heat exchanger, and a first pump.The cold circuit includes a second heat exchanger and a second pump. The hot circuit includes a first mixing element and a first particle separator. The cold circuit includes a second mixing element and a second particle separator. The first mixing element of the hot circuit is connected to the second particle separator of the cold circuit via a first particle transport channel. The first particle separator of the hot circuit is connected to the second mixing element of the cold circuit via a second particle transport line.

[0007] The hot circuit fluid is pumped by the first pump from the first heat exchanger into the first mixing element, where it is mixed with the magnetocaloric particles it contains. The fluid, together with the magnetocaloric particles, forms the magnetocaloric fluid, which flows through the magnetic field. Similarly, the cold circuit fluid flowing from the second heat exchanger is pumped by the second pump into the second mixing element, where it is mixed with the magnetocaloric particles it contains. When the magnetocaloric particles of the hot circuit magnetocaloric fluid enter the magnetic field, their temperature rises, and consequently, so does the temperature of the hot circuit fluid.Within the magnetic field, or in special cases outside the magnetic field, the magnetocaloric particles are separated from the carrier fluid by the first particle separator. The warmer carrier fluid then flows to the first heat exchanger to release heat from the hot circuit. The magnetocaloric particles are transported via the second particle transport line to the second mixing element of the refrigeration circuit, where the carrier fluid of the refrigeration circuit is pumped from the second heat exchanger to the second mixing element by the second pump. In the second mixing element, the carrier fluid of the refrigeration circuit is mixed with cold magnetocaloric particles. The temperature of the magnetocaloric particles decreases upon leaving the magnetic field after separation in the first particle separator.When the magnetocaloric particles mix with the carrier fluid of the cold circuit, the temperature of the magnetocaloric particles rises and the temperature of the carrier fluid in the cold circuit falls.

[0008] Disclosure of the invention

[0009] The temperature control arrangement with the features of independent claim 1 has the advantage that the magnetohydrodynamic principle is combined with the magnetocaloric effect. This means that the magnetohydrodynamic principle is used to transport a magnetocaloric fluid into and out of a magnetic field. The magnetocaloric fluid changes its temperature depending on whether it is inside or outside the magnetic field.

[0010] Embodiments of the invention enable higher efficiency and a wider temperature range than other temperature control arrangements known from the prior art. Furthermore, the control of heat distribution can also be improved.

[0011] Embodiments of the present invention provide a temperature control arrangement with a heat source and a heat sink, each thermally coupled via a temperature control fluid circuit and a heat exchanger with at least one magnetocaloric circuit. The heat source absorbs heat from the at least one magnetocaloric circuit via the corresponding heat exchanger and dissipates it to the outside. The heat sink dissipates heat absorbed from the outside to the at least one magnetocaloric circuit via the corresponding heat exchanger. The at least one magnetocaloric circuit comprises a closed channel system with at least one channel for guiding a magnetocaloric medium. At least one of the heat exchangers is designed as a pumped heat exchanger in which a magnetic device and at least one magnetohydrodynamic pump module are at least partially integrated.The at least one magnetohydrodynamic pump module comprises an electrode device configured to conduct an electric current through the magnetocaloric medium in a channel section of the at least one channel of the at least one magnetocaloric circuit, such that, in conjunction with a magnetic field generated by the magnetic device, a Lorentz force is created which selectively accelerates the magnetocaloric medium in the at least one channel section and a resulting pressure build-up causes a desired volume flow of the magnetocaloric medium through the at least one channel of the closed channel system. The magnetocaloric medium heats up when entering the magnetic field and cools down when exiting the magnetic field.

[0012] A magnetohydrodynamic pump module is understood to be a component in which the first electrode of the electrode device introduces an electric current with a predetermined current density into the magnetocaloric medium, which is also electrically and thermally conductive, at least one channel section, and a second electrode of the electrode device discharges the electric current from the magnetocaloric medium at least one channel section, such that the interaction of the magnetocaloric medium guided in the channel section with the introduced electric current and with the magnetic field generated by the magnet device produces a Lorentz force, which selectively accelerates the magnetocaloric medium in the at least one channel section, and the resulting pressure build-up causes the desired volume flow of the magnetocaloric medium through the at least one channel.

[0013] The term magnetocaloric medium is understood below to mean a medium with an electrical conductivity greater than 1 S / m (Siemens per meter). Preferably, the magnetocaloric medium has a significantly higher electrical conductivity in the range of 100 to 1000 S / m. Preferably, the magnetocaloric medium is liquid at atmospheric pressure even at temperatures as low as -20°C and can be easily heated from a lower temperature to a temperature of -20°C or higher. Advantageous improvements to the temperature control arrangement specified in independent claim 1 are possible through the measures and further developments listed in the dependent claims.

[0014] A particular advantage is that the magnetic device can comprise at least one magnet which, against the flow direction of the magnetocaloric medium, can protrude from the corresponding pump heat exchanger at its inlet in such a way that the magnetocaloric medium can heat up to a maximum temperature value in the corresponding magnetocaloric circuit before entering the pump heat exchanger. The at least one magnet of the magnetic device can project sufficiently into the corresponding pump heat exchanger that the magnetocaloric medium can cool down to a minimum temperature value in the corresponding magnetocaloric circuit by releasing heat before exiting the pump heat exchanger. Thus, the magnetocaloric medium continues to cool down after exiting the magnetic field within the pump heat exchanger.This means that the magnetocaloric medium has the highest temperature at the inlet to the pump heat exchanger and the lowest temperature at the outlet of the corresponding magnetocaloric circuit. Furthermore, the at least one magnet of the magnetic device can be designed as a permanent magnet or as an electromagnet. Using at least one permanent magnet allows for the simple provision of a static magnetic field. Using at least one electromagnet, which includes at least one coil structure, allows for the provision of a time-varying magnetic field.

[0015] In an advantageous embodiment of the temperature control arrangement, the electrode device can comprise two electrodes. A first electrode can introduce an electric current with a predetermined current density into the magnetocaloric medium at the at least one channel section, and a second electrode can discharge the electric current from the magnetocaloric medium at the at least one channel section. The two electrodes of the electrode device can be positioned such that the electric current flows perpendicular to the generated magnetic field. Preferably, the at least one magnet of the magnet device and the two electrodes of the electrode device can be of the same length.This advantageously prevents the flow velocity of the magnetocaloric medium from being slowed down by eddy current effects when the electrodes of the electrode device are shorter than the at least one magnet of the magnet device.

[0016] In a further advantageous embodiment of the temperature control arrangement, the heat source and the heat sink can each be thermally coupled via a temperature control fluid circuit and a heat exchanger with at least two magnetocaloric circuits. Two adjacent magnetocaloric circuits can be thermally coupled to each other via the pumped heat exchanger. The heat sink can be thermally coupled to an adjacent first of the at least two magnetocaloric circuits via a first temperature control fluid circuit and a heat exchanger designed as a pumpless heat exchanger. The heat source can be thermally coupled to an adjacent last of the at least two magnetocaloric circuits via a second temperature control fluid circuit and a heat exchanger designed as a pumped heat exchanger.This allows for the cascading of several magnetocaloric circuits, so that the temperature of the magnetocaloric medium at the inlets of the pump heat exchangers in successive magnetocaloric circuits increases stepwise from the heat sink via the first magnetocaloric circuit to the last magnetocaloric circuit and to the heat source, so that the magnetocaloric medium has the highest temperature of the cascaded magnetocaloric circuits at the inlet of the pump heat exchanger of the last magnetocaloric circuit, which is located adjacent to the second temperature control circuit of the heat source.Similarly, the temperature at the outlets of the pump heat exchangers in successive magnetocaloric circuits decreases stepwise, starting from the heat source, through the last magnetocaloric circuit, to the first magnetocaloric circuit and the heat sink. This ensures that the magnetocaloric medium at the outlet of the pump heat exchanger of the first magnetocaloric circuit, which is located adjacent to the first temperature control circuit of the heat sink, has the lowest temperature of the cascaded magnetocaloric circuits. In a further advantageous embodiment of the temperature control arrangement, the heat exchangers can be designed to allow horizontal heat transfer. For this purpose, the heat exchangers can have a corresponding structure and be made of suitable materials.For example, the structure of the heat exchanger can be built as a stack of plates made up of several thermally conductive copper plates, between which thermal insulating plates are arranged.

[0017] Exemplary embodiments of the invention are shown in the drawings and are explained in more detail in the following description. In the drawings, identical reference numerals denote components or elements that perform the same or analogous functions.

[0018] Brief description of the drawings

[0019] Fig. 1 shows a schematic representation of a first embodiment of a temperature control arrangement according to the invention with a magnetocaloric circuit.

[0020] Fig. 2 shows a schematic representation of a second embodiment of a temperature control arrangement according to the invention with two cascaded magnetocaloric circuits.

[0021] Fig. 3 shows a schematic representation of a third embodiment of a temperature control arrangement according to the invention with eight cascaded magnetocaloric circuits.

[0022] Fig. 4 shows a schematic representation of a pump heat exchanger for the temperature control arrangements according to the invention from Figs. 1 to 3.

[0023] Embodiments of the invention

[0024] As can be seen from Figures 1 to 4, the illustrated embodiments of a temperature control arrangement 1 according to the invention each comprise a heat source 3 and a heat sink 5, which are each thermally coupled to at least one magnetocaloric circuit 10 via a temperature control medium circuit 7 and a heat exchanger 18. The heat source 3 absorbs heat from the at least one magnetocaloric circuit 10 via the corresponding heat exchanger 18 and dissipates it to the outside, and the heat sink 5 dissipates heat absorbed from the outside to the at least one magnetocaloric circuit 10 via the corresponding heat exchanger 18. The at least one magnetocaloric circuit 10 comprises a closed channel system 14 with at least one channel 14A for guiding a magnetocaloric medium 12.At least one of the heat exchangers 18 is designed as a pumped heat exchanger 18A, in which a magnetic device 16 and at least one magnetohydrodynamic pump module 20 are at least partially integrated. The at least one magnetohydrodynamic pump module 20 comprises an electrode device 22, which is configured to conduct an electric current through the magnetocaloric medium 12 in a channel section 15 of the at least one channel 14A of the at least one magnetocaloric circuit 10, so that, in conjunction with a magnetic field generated by the magnetic device 16, a Lorentz force is created which selectively accelerates the magnetocaloric medium 12 in the at least one channel section 15, and the resulting pressure build-up causes a desired volume flow of the magnetocaloric medium 12 through the at least one channel 14A of the closed channel system 14.The magnetocaloric medium 12 heats up when entering the magnetic field and cools down when exiting the magnetic field.

[0025] The temperature control circuit 7 is also designed as a closed channel system 9 with at least one channel 9A, in which, in the illustrated embodiment, an electrically and thermally conductive medium 8 is guided as the temperature control medium. At least one magnetohydrodynamic pump module 20 (not shown in detail) or a conventional fluid pump can be used to move the electrically and thermally conductive medium 8 within the closed channel system.

[0026] As can be seen particularly in Fig. 4, the magnetic device 16 of the magnetohydrodynamic pump module 20 in the illustrated embodiments of the temperature control arrangement 1 comprises two magnets 16A, 16B designed as permanent magnets, which project from the corresponding pump heat exchanger 18A against the flow direction of the magnetocaloric medium 12 at the inlet of the corresponding pump heat exchanger 18A in such a way that the magnetocaloric medium 12 heats up to a maximum temperature value in the corresponding magnetocaloric circuit 10 before entering the pump heat exchanger 18A. Since the temperature of the magnetocaloric medium 12 increases upon entering the magnetic field of the magnetic device 16 and thus before entering the corresponding pump heat exchanger 18A, the magnetocaloric medium 12 has its highest temperature in the corresponding magnetocaloric circuit 10 upon entering the pump heat exchanger 18A.Here, the magnets 16A, 16B of the magnetic device 16 extend so far into the corresponding pump heat exchanger 18A that the magnetocaloric medium 12 cools down to a minimum temperature in the corresponding magnetocaloric circuit 10 by heat dissipation before exiting the pump heat exchanger 18A. Since the temperature of the magnetocaloric medium 12 decreases upon exiting the magnetic field of the magnetic device 16 and thus before exiting the corresponding pump heat exchanger 18A, and since the magnetocaloric medium 12 continues to cool further within the pump heat exchanger 18A, the magnetocaloric medium 12 has the lowest temperature in the corresponding magnetocaloric circuit 10 upon exiting the pump heat exchanger 18A.

[0027] In an alternative embodiment of the pump heat exchanger 18A not shown, the at least one magnet 16A, 16B is designed as an electromagnet.

[0028] As can be seen in Fig. 4, the electrode device 22 comprises two electrodes 24, which are of the same length as the two magnets 16A, 16B. When a voltage is applied to the terminal contacts K1, K2, a first electrode 24A introduces an electric current with a predetermined current density into the magnetocaloric medium 12 at the at least one channel section 15, and a second electrode 24B conducts the electric current out of the magnetocaloric medium 12 at the at least one channel section 15. The two electrodes 24 of the electrode device 22 are positioned such that the electric current flows perpendicular to the generated magnetic field.

[0029] As can be further seen from Fig. 1, the temperature control arrangement 1A in the illustrated first embodiment comprises the heat sink 5, the heat source 3, and only one magnetocaloric circuit 10A, which is thermally coupled to the heat sink 5 via a heat exchanger 18 designed as a pumpless heat exchanger 18B and a first temperature control fluid circuit 7A. The heat source 3 is thermally coupled to the adjacent magnetocaloric circuit 10A via a second temperature control fluid circuit 7B and a heat exchanger 18 designed as a pumped heat exchanger 18A. The heat sink 5 absorbs heat from the outside and transfers it to the magnetocaloric medium of the magnetocaloric circuit 10A via the electrically and thermally conductive medium 8 of the first temperature control fluid circuit 7A and the pumpless heat exchanger 18B.This increases the temperature of the magnetocaloric medium 12 in the magnetocaloric circuit 10A, and it is further increased when the magnetocaloric medium 12 enters the magnet device 16. The heat from the magnetocaloric medium 12 is transferred via the pump heat exchanger 18A to the electrically and thermally conductive medium 8 of the second temperature control circuit 7B and from there to the heat source 3, which dissipates the heat to the outside. This reduces the temperature of the electrically and thermally conductive medium 8 in the second temperature control circuit 7B at the outlet of the heat source 3. At the pump heat exchanger 18A of the magnetocaloric circuit 10A, the electrically and thermally conductive medium 8 absorbs heat from the magnetocaloric medium 12 of the magnetocaloric circuit 10A, so that the magnetocaloric medium 12 at the outlet of the pump heat exchanger 18A has the lowest temperature in the magnetocaloric circuit 10A.At the pumpless heat exchanger 18B, the magnetocaloric medium 12 of the magnetocaloric circuit 10A absorbs heat from the electrically and thermally conductive medium 8 of the first temperature control circuit 7A, so that the latter is cooled.

[0030] As can be further seen from Fig. 2, the temperature control arrangement 1B in the illustrated second embodiment comprises the heat sink 5, the heat source 3, and two magnetocaloric circuits 10A and 10B. The heat sink 5 is thermally coupled to an adjacent first magnetocaloric circuit 10A via the first temperature control circuit 7A and the heat exchanger 18, which is designed as a pumpless heat exchanger 18B. This first magnetocaloric circuit 10A is thermally coupled to a second magnetocaloric circuit 10B via a heat exchanger 18, which is designed as a pumped heat exchanger 18A. The heat source 3 is thermally coupled to the adjacent second magnetocaloric circuit 10B via the second temperature control circuit 7B and a heat exchanger 18, which is designed as a pumped heat exchanger 18A.

[0031] As in the first embodiment, the heat sink 5 absorbs heat from the outside and transfers it via the electrically and thermally conductive medium 8 of the first temperature control circuit 7A and the pumpless heat exchanger 18B to the magnetocaloric medium of the first magnetocaloric circuit 10A. This increases the temperature of the magnetocaloric medium 12 in the first magnetocaloric circuit 10A, and it is further increased when the magnetocaloric medium 12 enters the magnet device 16. The heat from the magnetocaloric medium 12 is transferred via the pump heat exchanger 18A to the magnetocaloric medium 12 of the second magnetocaloric circuit 10B. This increases the temperature of the magnetocaloric medium 12 in the second magnetocaloric circuit 10B, and it is further increased when the magnetocaloric medium 12 enters the magnet device 16.The temperature of the magnetocaloric medium 12 in the first magnetocaloric circuit 10A is reduced at the outlet of the pump heat exchanger 18A of the first magnetocaloric circuit 10A. The heat from the magnetocaloric medium 12 of the second magnetocaloric circuit 10B is transferred via the pump heat exchanger 18A to the electrically and thermally conductive medium 8 of the second temperature control circuit 7B and from there to the heat source 3, which dissipates the heat to the outside. This reduces the temperature of the electrically and thermally conductive medium 8 in the second temperature control circuit 7B at the outlet of the heat source 3.At the pump heat exchanger 18A of the second magnetocaloric circuit 10B, the electrically and thermally conductive medium 8 absorbs heat from the magnetocaloric medium 12 of the second magnetocaloric circuit 10B, so that the magnetocaloric medium 12 of the second magnetocaloric circuit 10B has the lowest temperature in the second magnetocaloric circuit 10B at the outlet of the pump heat exchanger 18A of the second magnetocaloric circuit 10B. At the pumpless heat exchanger 18B of the first magnetocaloric circuit 10A, the magnetocaloric medium 12 of the second magnetocaloric circuit 10B absorbs heat from the magnetocaloric medium 12 of the first magnetocaloric circuit 10A, so that the magnetocaloric medium 12 of the first magnetocaloric circuit 10A has the lowest temperature in the first magnetocaloric circuit 10B at the outlet of the pumped heat exchanger 18A of the first magnetocaloric circuit 10A.At the pumpless heat exchanger 18B, the magnetocaloric medium 12 of the first magnetocaloric circuit 10A absorbs heat from the electrically and thermally conductive medium 8 of the first temperature control circuit 7A, so that the latter is cooled.

[0032] As can be further seen from Fig. 3, the temperature control arrangement 1C in the illustrated third embodiment comprises the heat sink 5, the heat source 3, and eight magnetocaloric circuits 10A to 10H. Here, the heat sink 5 is thermally coupled via the first temperature control medium circuit 7A and the heat exchanger 18, designed as a pumpless heat exchanger 18B, to an adjacent first magnetocaloric circuit 10A, which is thermally coupled via a heat exchanger 18, designed as a pumped heat exchanger 18A, to a second magnetocaloric circuit 10B. The second magnetocaloric circuit 10B is thermally coupled via a heat exchanger 18, designed as a pumped heat exchanger 18A, to a third magnetocaloric circuit 10C. The third magnetocaloric circuit 10C is thermally coupled to a fourth magnetocaloric circuit 10D via a heat exchanger 18 designed as a pump heat exchanger 18A.The fourth magnetocaloric circuit 10D is thermally coupled to a fifth magnetocaloric circuit 10E via a heat exchanger 18 designed as a pump heat exchanger 18A. The fifth magnetocaloric circuit 10E is thermally coupled to a sixth magnetocaloric circuit 10F via a heat exchanger 18 designed as a pump heat exchanger 18A. The sixth magnetocaloric circuit 10F is thermally coupled to a seventh magnetocaloric circuit 10G via a heat exchanger 18 designed as a pump heat exchanger 18A. The seventh magnetocaloric circuit 10G is thermally coupled to an eighth magnetocaloric circuit 10H via a heat exchanger 18 designed as a pump heat exchanger 18A. The heat source 3 is thermally coupled to the adjacent eighth magnetocaloric circuit 10H via the second temperature control circuit 7B and a heat exchanger 18 designed as a pump heat exchanger 18A.

[0033] The heat transfer from the heat sink 5 to the heat source 3 via the eight magnetocaloric circuits 10A to 10H proceeds in the illustrated third embodiment of the temperature control arrangement 1C analogously to the heat transfer described above with reference to Fig. 2 in the second embodiment of the temperature control arrangement 1B, in which the heat transfer only takes place via two magnetocaloric circuits 10A, 10B. Therefore, a further description of the heat transfer is omitted here.Figure 3 shows a cascade of eight magnetocaloric circuits 10A to 10H, such that the temperature of the magnetocaloric medium 12 at the inlets of the pump heat exchangers 18A in successive magnetocaloric circuits 10A to 10H increases stepwise from the heat sink 5 via the first magnetocaloric circuit 10A to the eighth magnetocaloric circuit 10H and to the heat source 3, so that the magnetocaloric medium 12 at the inlet of the pump heat exchanger 18A of the eighth magnetocaloric circuit 10H, which is located adjacent to the second temperature control circuit 7B of the heat source 3, has the highest temperature of the cascaded magnetocaloric circuits 10A to 10H.Similarly, the temperature at the outlets of the pump heat exchanger 8A in successive magnetocaloric circuits 10H to 10A decreases stepwise from the heat source 3 via the eighth magnetocaloric circuit 10H to the first magnetocaloric circuit 10A and to the heat sink 5, so that the magnetocaloric medium 12 at the outlet of the pump heat exchanger 18A of the first magnetocaloric circuit 10A, which is located adjacent to the first temperature control medium circuit 7A of the heat sink 5, has the lowest temperature of the cascaded magnetocaloric circuits 10A to 10H.

[0034] The heat exchangers 18 in the illustrated embodiments are designed such that the heat transfer is essentially horizontal.

Claims

Claims 1. Temperature control arrangement (1) with a heat source (3) and a heat sink (5), each thermally coupled via a temperature control medium circuit (7) and a heat exchanger (18) with at least one magnetocaloric circuit (10), wherein the heat source (3) absorbs heat from the at least one magnetocaloric circuit (10) via the corresponding heat exchanger (18) and releases it to the outside, and the heat sink (5) releases heat absorbed from the outside to the at least one magnetocaloric circuit (10) via the corresponding heat exchanger (18), wherein the at least one magnetocaloric circuit (10) comprises a closed channel system (14) with at least one channel (14A) for guiding a magnetocaloric medium (12), wherein at least one of the heat exchangers (18) is designed as a pumped heat exchanger (18A) in which a magnetic device (16) and at least one magnetohydrodynamic pump module are located. (20) are at least partially integrated,wherein the at least one magnetohydrodynamic pump module (20) comprises an electrode device (22) which is configured to conduct an electric current through the magnetocaloric medium (12) in a channel section (15) of the at least one channel (14A) of the at least one magnetocaloric circuit (10), such that, in conjunction with a magnetic field generated by the magnet device (16), a Lorentz force is created which selectively accelerates the magnetocaloric medium (12) in the at least one channel section (15) and a resulting pressure build-up causes a desired volume flow of the magnetocaloric medium (12) through the at least one channel (14A) of the closed channel system (14), wherein the magnetocaloric medium (12) heats up upon entering the magnetic field and cools down upon exiting the magnetic field.

2. Temperature control arrangement (1) according to claim 1, characterized in that the magnetic device (16) comprises at least one magnet (16A, 16B) which projects from the corresponding pump heat exchanger (18A) against a flow direction of the magnetocaloric medium (12) at the inlet of the corresponding pump heat exchanger (18A) in such a way that the magnetocaloric medium (12) is heated to a maximum temperature value in the corresponding magnetocaloric circuit (10) before entering the pump heat exchanger (18A).

3. Temperature control arrangement (1) according to claim 2, characterized in that the at least one magnet (16A, 16B) of the magnet device (16) projects so far into the corresponding pump heat exchanger (18A) that the magnetocaloric medium (12) cools down to a minimum temperature value in the corresponding magnetocaloric circuit (10) by releasing heat before exiting the pump heat exchanger (18A).

4. Temperature control arrangement (1) according to claim 2 or 3, characterized in that the at least one magnet (16A, 16B) is designed as a permanent magnet or as an electromagnet.

5. Temperature control arrangement (1) according to one of claims 1 to 4, characterized in that the electrode device (22) comprises two electrodes (24), wherein a first electrode (24A) introduces an electric current flow with a predetermined current density into the magnetocaloric medium (12) at the at least one channel section (15) and a second electrode (24B) directs the electric current flow out of the magnetocaloric medium (12) at the at least one channel section (15).

6. Temperature control arrangement (1) according to claim 5, characterized in that the two electrodes (24) of the electrode device (22) are positioned such that the electric current flow is perpendicular to the generated magnetic field.

7. Temperature control arrangement (1) according to claims 2 and 5, characterized in that the at least one magnet (16A, 16B) of the magnet device (16) and the two electrodes (24) of the electrode device (22) are of the same length.

8. Temperature control arrangement (1) according to one of claims 1 to 7, characterized in that the heat source (3) and the heat sink (5) are each thermally coupled via a temperature control medium circuit (7) and a heat exchanger (18) with at least two magnetocaloric circuits (10).

9. Temperature control arrangement (1) according to claim 8, characterized in that two adjacent magnetocaloric circuits (10) are thermally coupled to each other via the pump heat exchanger (18A).

10. Temperature control arrangement (1) according to claim 8 or 9, characterized in that the heat sink (5) is thermally coupled to an adjacent first of the at least two magnetocaloric circuits (10) via a first temperature control medium circuit (7A) and a heat exchanger (18) designed as a pumpless heat exchanger (18B).

11. Temperature control arrangement (1) according to one of claims 8 to 10, characterized in that the heat source (3) is thermally coupled to an adjacent last of the at least two magnetocaloric circuits (10) via a second temperature control medium circuit (7B) and a heat exchanger (18) designed as a pump heat exchanger (18A).

12. Temperature control arrangement (1) according to one of claims 1 to 11 , characterized in that the heat exchangers (18) are designed such that the heat transfer takes place horizontally.

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