Elastocaloric heat pump and motor vehicle with elastocaloric heat pump

Abstract

To provide an elastocaloric heat pump that meets high tightness requirements and has a high efficiency, an elastocaloric heat pump (100) comprising at least one first cooling medium channel (10), at least one second cooling medium channel (11), at least one elastocaloric element (12), and a drive device (15) is proposed, wherein the at least one elastocaloric element (12) is arranged between a first cooling medium channel (10) and a second cooling medium channel (11) and is connected at its end to a slide (13) in each case, wherein the slides (13) are slidably arranged on two guide means (14) that are not arranged parallel to each other, wherein the drive device (15) is configured to cyclically move the slides (13) along the guide means (14) so ​​that the at least one elastocaloric element (12) alternately comes into thermal contact with an outer wall (16),in particular with a contact area (31) of an outer wall (16), of the first cooling medium channel (10) and is brought into thermal contact with an outer wall (17), in particular with a contact area (31) of an outer wall (17), of the second cooling medium channel (11).

Description

[0001] The present invention relates to an elastocaloric heat pump comprising at least one first cooling medium channel, at least one second cooling medium channel, and at least one elastocaloric element.

[0002] Furthermore, the present invention relates to a motor vehicle with an elastocaloric heat pump.

[0003] Elastocaloric heat pumps can be used to increase the efficiency of heat pumps, for example, in motor vehicles. Elastocaloric heat pumps utilize the elastocaloric effect, whereby cyclic deformation of an elastocaloric material causes a reversible temperature change, which can be used to transfer heat from a cooler coolant stream to a warmer coolant stream.

[0004] From DE 10 2018 200 376 A1 a device for heat exchange is known, wherein the device for heat exchange comprises elastocaloric bands made of elastocaloric material and heat conducting elements, wherein the heat conducting elements are designed such that a biconvex section of a heat conducting element engages in at least one elastocaloric band and deforms it, so that an elastocaloric effect is achieved, and heat conduction takes place between the at least one elastocaloric band and the biconvex section of the heat conducting element, and a planar section of a further heat conducting element is in contact with the elastocaloric band in the undeformed state thereof such that heat conduction takes place between the planar section of the further heat conducting element and the at least one elastocaloric band.

[0005] DE 10 2018 213 497 A1 discloses a heat exchanger configured to enclose a fluid line carrying a heat-transfer fluid. The means comprises at least one elastocaloric element connected to the fluid line, at least one actuator acting on the elastocaloric element and configured, upon actuation, to exert a force on the at least one elastocaloric element to deform the at least one elastocaloric element, and at least one fastening element configured to fasten the heat exchanger to the fluid line.

[0006] DE 10 2021 209 740 A1 discloses a heat pump comprising an elastocaloric element, a first coolant channel on a cold side for a first coolant flow and a second coolant channel on a hot side for a second coolant flow, a first drive element and a second drive element, wherein the elastocaloric element is clamped on both sides between the first drive element and the second drive element, wherein the first drive element and the second drive element are designed to move the elastocaloric element cyclically back and forth between the first coolant channel and the second coolant channel and to deform the elastocaloric element cyclically.

[0007] From US 11,204,189 B2 a cooling method using an elastocaloric material is known.

[0008] Elastocaloric heat pumps, which transfer heat energy from a colder gaseous or liquid cooling medium to a warmer gaseous or liquid cooling medium, must meet stringent sealing requirements to prevent the cooling media from leaking out. Furthermore, especially for cooling media with a low thermal conductivity coefficient, a particularly large surface area must be provided for the elastocaloric element to ensure sufficient heat transfer. This places stringent demands on the shape and thus the manufacturability of the elastocaloric element. Direct contact with the cooling medium, water, can cause it to condense on the elastocaloric element, which may then evaporate again on the hot side and be absorbed by the warm air. Such heat pumps therefore also require dehumidification.

[0009] The present invention is based on the object of providing an elastocaloric heat pump which meets high sealing requirements and has a high efficiency.

[0010] To achieve the object underlying the invention, an elastocaloric heat pump comprising at least one first cooling medium channel, at least one second cooling medium channel, at least one elastocaloric element, and a drive device is proposed, wherein the at least one elastocaloric element is arranged between a first cooling medium channel and a second cooling medium channel and is connected at each end to a slide, wherein the slides are arranged displaceably on two guide means which are not arranged parallel to one another, wherein the drive device is designed to displace the slides cyclically along the guide means, so that the at least one elastocaloric element is alternately in thermal contact with an outer wall, in particular with a contact region of an outer wall, of the first cooling medium channel and in thermal contact with an outer wall, in particular with a contact region of an outer wall,of the second cooling medium channel.,

[0011] A cooling medium can be guided in the first cooling medium channel and the second cooling medium channel. The cooling medium can be a fluid, in particular a gaseous cooling medium and / or a liquid cooling medium. The cooling medium can also be a coolant. In particular, the cooling medium can be water or air.

[0012] The at least one elastocaloric element is arranged between the first cooling medium channel and the second cooling medium channel and is connected to a slide at each end. Thus, in particular, two slides are provided. The drive device serves to cyclically displace the slides along two guide means arranged non-parallel to one another, so that the elastocaloric element is alternately brought into thermal contact with an outer wall, in particular with a contact area of ​​an outer wall, of the first cooling medium channel, and into thermal contact with an outer wall, in particular with a contact area of ​​an outer wall, of the second cooling medium channel. The thermal contact is in particular a physical contact.Due to the mutual thermal contact, heat can be transferred from the elastocaloric element to the first cooling medium channel, in particular to a cooling medium guided in the first cooling medium channel, and heat can be transferred from the second cooling medium channel, in particular from a cooling medium guided in the second cooling medium channel, to the elastocaloric element.

[0013] Since the elastocaloric element is in thermal contact with the outer wall of the first cooling medium channel and / or the outer wall of the second cooling medium channel, the elastocaloric element is not in direct physical contact with the cooling medium conveyed in the first cooling medium channel and / or the second cooling medium channel. This allows for high sealing requirements to be met. The risk of corrosion for the elastocaloric element is also reduced. Furthermore, with a suitable choice of material for the first cooling medium channel and / or the second cooling medium channel, high heat transfer and thus high efficiency can be achieved.

[0014] The first cooling medium channel and the second cooling medium channel can thus preferably be made of a material with a high thermal conductivity coefficient, at least in the region of the outer wall, more preferably in a contact region of the outer wall. The material can be, for example, a metal, in particular copper or aluminum.

[0015] Due to the high thermal conductivity of the material of the first cooling medium channel and the second cooling medium channel, especially the contact area of ​​the outer wall, the heat is quickly conducted to the cooling medium.

[0016] The carriages can be cyclically moved along the guide means, which are not arranged parallel to one another, by means of the drive device. Since the guide means are not arranged parallel to one another, the distance between the carriages changes during the cyclical movement, i.e., the distance increases and decreases cyclically. This can generate restoring forces that support the cyclical movement and, in particular, return the carriages to their original position.

[0017] For example, by cyclical change of the distance between the slides, at least one elastocaloric element can be cyclically stretched.

[0018] An elongation can be understood as a stretching, i.e. a positive change in length, and / or a compression, i.e. a negative change in length.

[0019] Due to the cyclical expansion of the elastocaloric element during displacement, it can be heated and cooled due to the elastocaloric effect. This allows heat transfer between the first cooling medium channel and the second cooling medium channel.

[0020] In a stretched state, the elastocaloric element exhibits a material restoring force that counteracts the stretching. Since the guide means are not arranged parallel to one another, these material restoring forces also have a component along the guide means, which provides the restoring force explained above. It is also conceivable for a spring to be mounted between the slides, which is stretched, i.e., compressed or extended, during a cyclical displacement of the slides along the guide means, which are not arranged parallel to one another.

[0021] The first cooling medium channel and the second cooling medium channel can be aligned at a, preferably right, angle to a main extension direction of the elastocaloric element. The main extension direction of the elastocaloric element preferably corresponds to the extension direction of the elastocaloric element.

[0022] The at least one first cooling medium channel can be designed as a hot channel. The at least one second cooling medium channel can be designed as a cold channel. During operation of the heat pump, it can thus be provided that heat is transferred from a second cooling medium channel, in particular from a cooling medium guided in a second cooling medium channel, to a first cooling medium channel, in particular to a cooling medium guided in a first cooling medium channel.

[0023] Preferably, a plurality of first cooling medium channels, a plurality of second cooling medium channels and a plurality of elastocaloric elements are provided, wherein one elastocaloric element is arranged between each first cooling medium channel and each second cooling medium channel and is connected at the end to each of the slides.

[0024] Thus, a plurality of first and second cooling medium channels, in particular arranged parallel to one another, can be provided, wherein one of the plurality of elastocaloric elements is arranged between each of the plurality of first cooling medium channels and one of the plurality of second cooling medium channels.

[0025] By moving the slides on the guide means which are not arranged parallel to each other, the elastocaloric elements are alternately brought into thermal contact with a first cooling medium channel and a second cooling medium channel.

[0026] It is preferably provided that the at least one elastocaloric element is an elastocaloric band, in particular an elastocaloric flat band.

[0027] The main direction of extension of the elastocaloric element designed as an elastocaloric band, in particular as an elastocaloric flat band, corresponds to the direction of greatest extension.

[0028] It can be further advantageously provided that the first cooling medium channel and the second cooling medium channel are thermally insulated, at least outside the outer wall, in particular outside the contact area of ​​the outer wall.

[0029] In particular, the cooling medium channels can be thermally insulated from each other and / or from the environment. A coating can be provided for this purpose. Furthermore, the first cooling medium channel and the second cooling medium channel can be encased in plastic.

[0030] With further advantage, it can be provided that the at least one first cooling medium channel and / or the at least one second cooling medium channel have heat transfer structures, in particular ribs.

[0031] The heat transfer structures and / or the fins are preferably located within the first cooling medium channel and / or the second cooling medium channel. This increases the contact surface of the cooling medium channel with the cooling medium conveyed within the respective cooling medium channel, allowing optimal heat exchange. This is particularly advantageous when the cooling medium has a low thermal conductivity coefficient. Air is a cooling medium with a low thermal conductivity coefficient.

[0032] It is preferably provided that the at least one elastocaloric element is stretched, in particular stretched or compressed, in thermal contact with the outer wall of the at least one first cooling medium channel.

[0033] In other words, the elastocaloric element is stretched, in particular extended or compressed, at least in the state in which the elastocaloric element is in thermal contact with the outer wall, in particular with a contact region of the outer wall, of the first cooling medium channel.

[0034] It can further be provided that the elastocaloric element is not stretched, in particular not stretched or not compressed, in thermal contact with the outer wall, in particular with a contact region of the outer wall, of the at least one second cooling medium channel.

[0035] It can preferably be provided that the at least one elastocaloric element is stretched, at least partially, when the carriages are displaced on the guide means which are not arranged parallel to one another.

[0036] As explained above, the distance between the two slides changes cyclically during a displacement along the non-parallel guide means. If the elastocaloric element is firmly clamped between the two slides, it is stretched, i.e., extended or compressed, due to this cyclical change in distance. Thus, the non-parallel arrangement of the guide means can already cause the expansion and / or compression of the elastocaloric element, thus effecting heat transfer from the second cooling medium channel to the first cooling medium channel.

[0037] Furthermore, it can be provided that the outer wall, in particular a contact region of the outer wall, of the first cooling medium channel is preferably convex, curved, so that the at least one elastocaloric element is stretched by the contact with the outer wall of the first cooling medium channel.

[0038] Thus, in particular in addition to the expansion of the at least one elastocaloric element caused by the displacement of the slides along the non-parallel guide means, the geometry of the outer wall of the first cooling medium channel can also lead to an expansion of the elastocaloric element. If the outer wall of the first cooling medium channel is convexly curved, the elastocaloric element can optimally conform to the outer wall of the first cooling medium channel for a large overlap. Furthermore, the curvature, preferably of the contact area, of the outer wall of the cooling medium channel can cause additional expansion of the elastocaloric element.

[0039] If the radius of curvature of the outer wall of the first cooling medium channel is large, only a small portion of the expansion of the elastocaloric element is caused by the curvature of the outer wall of the first cooling medium channel. In this case, the curvature of the first cooling medium channel primarily serves to compensate for manufacturing tolerances.

[0040] If, however, the radius of curvature of the outer wall of the first cooling medium channel is small, a large portion of the expansion of the elastocaloric element required for heat transfer can be caused by the curvature. In this case, the guide means that are not arranged parallel to one another can deviate only slightly from a parallel arrangement, i.e., the angle enclosed between the two guide means is comparatively small, preferably less than 10°, more preferably less than 5°.

[0041] Furthermore, it can be provided that the outer wall, preferably the contact region of the outer wall, of the first cooling medium channel is elastically deformable, in particular resilient, and / or that the first cooling medium channel is resiliently mounted.

[0042] For example, the outer wall, preferably the contact region of the outer wall, of the first cooling medium channel can comprise a spring plate or be formed by a spring plate.

[0043] In addition, an elastic coating can be applied to the outer wall, preferably to the contact area of ​​the outer wall. The elastic coating can be formed as a graphite foil with a high thermal conductivity coefficient.

[0044] The elastically deformable design of the outer wall of the first cooling medium channel and / or the resilient mounting of the first cooling medium channel is particularly advantageous when the preferably convexly curved outer wall of the first cooling medium channel does not serve, or only to a limited extent, to induce expansion in the elastocaloric element, but rather when the curvature is intended to compensate for manufacturing tolerances. If the outer wall of the first cooling medium channel can yield resiliently, or if the first cooling medium channel is resiliently mounted, the forces occurring during physical contact between the elastocaloric element and the outer wall of the first cooling medium channel are limited, so that no or only minimal additional expansion of the elastocaloric element is caused.

[0045] It is preferably provided that the guide means are tracks, in particular roller tracks, and / or that the carriages are each guided along a guide means by means of a roller.

[0046] The raceways, in particular the roller raceway, can comprise a cage.

[0047] If the slides are guided along the guide means by means of rollers, a particularly low-friction movement of the slides can be enabled, so that the drive torque to be provided by the drive device can be reduced.

[0048] The guide means can also have or consist of two radial bearings, e.g. deep groove ball bearings.

[0049] It is preferably provided that the drive device comprises drive rods, in particular connecting rods or tappets, wherein the carriages are each rotatably or rigidly connected to one of the drive rods, wherein the drive rods are each guided along a guide means.

[0050] The connecting rods are used to move the carriages along the guides. For this purpose, the carriages are either rotatably or rigidly connected to the connecting rods. If rollers are provided to guide the carriages along the guides, the rollers can also be attached to the connecting rods or to the ends of the connecting rods.

[0051] If the guide means each have two radial bearings, e.g. deep groove ball bearings, the drive rods can be guided translationally in these.

[0052] It is further advantageous that the guide means and / or the drive rods are rotatably mounted so that an angle between the guide means and / or the drive rods can be adjusted.

[0053] Depending on the set angle, the amount of expansion of the elastocaloric element caused by the displacement of the slides along the non-parallel guide means can be adjusted, and thus the performance of the elastocaloric heat pump can be adjusted.

[0054] It is preferably provided that the drive device comprises at least one cam, wherein the drive rods are movable along the respective guide means by means of the cam.

[0055] The cam or cam lift can thus be converted into a movement of the drive rods.

[0056] In this case, a preferably telescopic force transmission element, in particular a rod or plate, can be provided, wherein the force transmission element is arranged between the cam and the drive rods, wherein the force transmission element is designed to transmit force from the cam to the drive rods.

[0057] In other words, by rotating the cam, the cam lift is first transmitted to the power transmission element. The movement of the power transmission element generated by the cam lift is then transmitted to the drive rods, which move the carriages along the guide means.

[0058] It can be provided that the force transmission element runs on the cam by means of a roller.

[0059] The restoring forces that occur preferentially during the cyclical displacement of the carriages due to the non-parallel arrangement of the guide means can in particular serve to ensure that there is always contact between the cam and the roller.

[0060] A further solution to the problem underlying the invention consists in a motor vehicle comprising an elastocaloric heat pump as described above.

[0061] The invention is explained in more detail below with reference to the accompanying figures. They show: Fig. 1 an elastocaloric heat pump, Fig. 2 a cooling medium channel with a slightly curved outer wall, Fig. 3 a cooling medium channel with a strongly curved outer wall, Fig. 4 an elastocaloric heat pump, Fig. 5 a cooling medium channel with a flat outer wall, and Fig. 6 a motor vehicle with an elastocaloric heat pump.

[0062] In the figures, identical or corresponding parts are marked with the same reference numerals.

[0063] Fig. 1 shows an elastocaloric heat pump 100 in accordance with the invention. The elastocaloric heat pump 100 comprises a plurality of first cooling medium channels 10, which are designed as hot channels 10a. Furthermore, the elastocaloric heat pump 100 comprises a plurality of second cooling medium channels 11, which are designed as cold channels 11a. A cooling medium, for example water or air, is guided within each of the first cooling medium channels 10 and the second cooling medium channels 11. The first cooling medium channels 10 and the second cooling medium channels 11 are arranged alternately and parallel to one another. An elastocaloric element 12 is arranged between each first cooling medium channel 10 and an adjacent second cooling medium channel 11. The elastocaloric elements 12 extend at a right angle transversely to the first cooling medium channels 10 and the second cooling medium channels 11.The elastocaloric elements 12 are each connected at their ends to a carriage 13. The carriages 13 are arranged on two guide means 14 that are not arranged parallel to one another and can be displaced up and down in the plane of the drawing. A drive device 15 is provided for displacing the carriages 13, which, during operation, cyclically displaces the carriages 13 along the guide means 14, so that the elastocaloric elements 12 are alternately brought into thermal contact with an outer wall 16 of one of the first cooling medium channels 10 and into thermal contact with an outer wall 17 of one of the second cooling medium channels 11. Due to the non-parallel arrangement of the guide means 14, the elastocaloric elements 12 are cyclically stretched. In particular, the elastocaloric elements 12 are stretched in thermal contact with the outer wall 16 of the respective first cooling medium channel 10.

[0064] The elastocaloric elements 12 are designed as elastocaloric flat strips 18. The first cooling medium channels 10 and the second cooling medium channels 11 have heat transfer structures 19 inside, which are designed as ribs 20 and by means of which heat transfer between the material of the cooling medium channels 10, 11 and the milling medium guided in the cooling medium channels 10, 11 is facilitated.

[0065] The guide means 14 are designed as tracks 21 or roller tracks 22. Each of the carriages 13 is guided along one of the tracks 21 by means of a roller 23. The drive device 15 comprises drive rods 24. The drive rods 24 are connected to the ends of the carriage 13, particularly in the area of ​​the rollers 23. The drive rods 24 are moved approximately up and down along the tracks 22 in the plane of the drawing, whereby the carriages 13 are also moved along the tracks 21 and the elastocaloric elements 12 come into alternating thermal contact with a first cooling medium channel 10 and a second cooling medium channel 11. Furthermore, the drive device 15 comprises a telescopic force transmission element 25, which is designed as a telescopic plate 26. The plate 26 comprises a roller 27, which runs on a cam 28 of the drive device 15.By rotating the cam 28, the cam stroke is transmitted via the roller 27 to the force transmission element 25, which in turn moves the drive rods 24 along the guide means 14 designed as raceways 21. An angle α between the guide means 14 can be adjusted by means of actuators 29. The guide means 14 are rotatably mounted for this purpose. The larger the angle α between the guide means 14, the greater the expansion of the elastocaloric elements 12 arranged between the carriages 13. By adjusting the angle α, the heat output of the elastocaloric heat pump 100 can thus be adjusted. Additional springs 30 in the raceways 21 serve to reduce the drive torque to be provided by the drive device 15 for the operation of the elastocaloric heat pump 100.

[0066] Fig. 2 shows a cross-section through a first cooling medium channel 10. An elastocaloric element 12 is in thermal contact with an outer wall 16 of the first cooling medium channel 10. The outer wall 16 provides a contact area 31 for the elastocaloric element 12. The outer wall 16 is slightly convexly curved, so that the elastocaloric material 12 is slightly curved when it is in thermal contact with the outer wall 16. This curvature can compensate for manufacturing tolerances. Furthermore, the curvature in the thermal contact of the elastocaloric element 12 with the outer wall 16 can cause additional expansion of the elastocaloric element 12. If additional expansion is not desired, the outer wall 16 can be resiliently designed, at least in the contact area 31. Alternatively, the first cooling medium channels 10 themselves can also be resiliently mounted.Outside the contact area 31 of the outer wall 16, the cooling medium channel 10 is provided with a thermal insulation 32.

[0067] Fig. 3 shows a further embodiment of a first cooling medium channel 10. Compared to the cooling medium channel 10 according to Fig. 2, the outer wall 16 or the contact area 31 of the outer wall 16 for the elastocaloric element 12 is more strongly curved. Due to the greater curvature, the elastocaloric element 12 is more strongly curved in thermal contact, so that a greater additional expansion is introduced into the elastocaloric element 12. If the first cooling medium channels 10 are Fig. 3, a large part of the expansion of the elastocaloric element 12 can be caused by the curvature of the outer wall 16 of the first cooling medium channel 10. In this case, as can be seen from the Fig. As shown in the elastocaloric heat pump 100 shown in Figure 4, the angle α between the guide means 14 can be selected to be comparatively small, preferably less than 10°, more preferably less than 5°. Thus, only a small portion of the expansion of the elastocaloric elements 12 is caused by the non-parallel arrangement of the guide means 14.

[0068] Fig. 5 shows a further first cooling medium channel 10. The second cooling medium channels 11 can be identical to the first cooling medium channel 10 according to Fig. 5. In contrast to the first cooling medium channels 10 according to the Fig. 3 and Fig. 4, the outer wall 16, or rather the contact area 31 of the outer wall 16 for thermal contact with the elastocaloric element 12, is flat. This means, in particular, that no or only a very slight additional expansion is introduced into the elastocaloric element 12 through the contact of the elastocaloric element 12 with the outer wall 16.

[0069] Fig. 6 shows a motor vehicle 200 with an elastocaloric heat pump 100. List of reference symbols 100 Elastocaloric heat pump 200 motor vehicles 10 First cooling medium channel 10a Hot runner 11 Second cooling medium channel 11a Cold runner 12 Elastocaloric element 13 sleds 14 Guide tools 15 Drive device 16 Exterior wall 17 Exterior wall 18 Elastocaloric flat belt 19 Heat transfer structure 20 ribs 21 Career 22 roller track 23 roll 24 Drive rod 25 Power transmission element 26 plate 27 roll 28 cams 29 Actuator 30 spring 31 Contact area 32 Insulation QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2018 200 376 A1

[0004] DE 10 2018 213 497 A1

[0005] DE 10 2021 209 740 A1

[0006] US 11,204,189 B2

[0007]

Claims

[1] Elastocaloric heat pump (100) comprising at least one first cooling medium channel (10), at least one second cooling medium channel (11), at least one elastocaloric element (12), and a drive device (15), wherein the at least one elastocaloric element (12) is arranged between a first cooling medium channel (10) and a second cooling medium channel (11) and is connected at its end to a respective carriage (13), wherein the carriages (13) are arranged displaceably on two guide means (14) which are not arranged parallel to one another, wherein the drive device (15) is designed to cyclically displace the carriages (13) along the guide means (14) so ​​that the at least one elastocaloric element (12) is alternately in thermal contact with an outer wall (16), in particular with a contact region (31) of an outer wall (16), of the first cooling medium channel (10) and in thermal contact with an outer wall (17),in particular with a contact area (31) of an outer wall (17) of the second cooling medium channel (11). [2] Elastocaloric heat pump (100) according to claim 1, characterized by in that a plurality of first cooling medium channels (10), a plurality of second cooling medium channels (11) and a plurality of elastocaloric elements (12) are provided, wherein one elastocaloric element (12) is arranged between a respective first cooling medium channel (10) and a respective second cooling medium channel (11) and is connected at the end to one of the slides (13). [3] Elastocaloric heat pump (100) according to claim 1 or 2, characterized by that the at least one elastocaloric element (12) is an elastocaloric band, in particular an elastocaloric flat band (18), and / or that the at least one first cooling medium channel (10) and / or the at least one second cooling medium channel (11) have heat transfer structures (19), in particular ribs (20). [4] Elastocaloric heat pump (100) according to one of the preceding claims, characterized by that the at least one elastocaloric element (12) is stretched, in particular stretched or compressed, in thermal contact with the outer wall (16) of the at least one first cooling medium channel (10). [5] Elastocaloric heat pump (100) according to one of the preceding claims, characterized by that the at least one elastocaloric element (12) is stretched, at least partially, upon displacement of the carriages (13) on the guide means (14) which are not arranged parallel to one another. [6] Elastocaloric heat pump (100) according to one of the preceding claims, characterized bythat the outer wall (16), in particular a contact region (31) of the outer wall (16), of the first cooling medium channel (10) is preferably convex, curved, so that the at least one elastocaloric element (12) is stretched by the contact with the outer wall (16) of the first cooling medium channel (10). [7] Elastocaloric heat pump (100) according to one of the preceding claims, characterized by that the outer wall (16), preferably the contact region (31) of the outer wall (16), of the first cooling medium channel (10) is elastically deformable, in particular resilient, and / or that the first cooling medium channel (10) is resiliently mounted. [8] Elastocaloric heat pump (100) according to one of the preceding claims, characterized bythat the guide means (14) are tracks (21), in particular roller tracks (22), and / or that the carriages (13) are each guided along a guide means (14) by means of a roller (23), and / or that the drive device (15) comprises drive rods (24), in particular connecting rods or tappets, wherein the carriages (13) are each rotatably or rigidly connected to one of the drive rods (24), wherein the drive rods (24) are each guided along a guide means (14). [9] Elastocaloric heat pump (100) according to one of the preceding claims, characterized by that the guide means (14) and / or the drive rods (24) are rotatably mounted so that an angle between the guide means (14) and / or the drive rods (24) can be adjusted. [10] Motor vehicle (200) comprising an elastocaloric heat pump (100) according to one of the preceding claims.

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