Heat exchanger, heat pump with a heat exchanger and method for producing the heat exchanger

Abstract

The invention relates to a heat exchanger 100, 200, 300, 400, 500, 700 for a heat pump, comprising: a first guide 110, 210, 310, 410, 510, 710 for guiding a first fluid, and a second guide 120, 220, 320, 420, 520, 720 for guiding a second fluid, wherein the heat exchanger comprises a hollow body with a first cavity region, wherein the first guide extends at least partially through the first cavity region, wherein the first guide is defined in a spiral plane by a first spiral curve, wherein the second guide extends at least partially along the first cavity region and is defined in the spiral plane by a second spiral curve, wherein the first spiral curve and the second spiral curve are parallel curves in the spiral plane, wherein the heat exchanger is designed to transfer heat between the first fluid and the second fluid,and wherein at least the first guide comprises a plurality of chambers in the direction perpendicular to the spiral plane.,

Description

[0001] The present invention relates to the field of heat pumps and, in particular, to a heat exchanger for use in a heat pump.

[0002] Air-to-water heat pumps typically use a first heat exchanger as an evaporator, which carries a refrigerant and is in contact with outside air. A second heat exchanger acts as a condenser, which also carries the refrigerant and is in contact with water in a heating circuit. At outside temperatures below or close to freezing, ice forms on the first heat exchanger (evaporator), reducing air flow and therefore requiring cyclical defrosting. A common method for this is circuit reversal. This involves reversing the flow direction of the refrigerant circuit so that heat is extracted from the heating water in the second heat exchanger and transferred to the ice on the first heat exchanger, which then defrosts. The second heat exchanger then acts as an evaporator.

[0003] However, there is a risk that water in the second heat exchanger will freeze, expand and thus damage the heat exchanger.

[0004] Such a defect in the heat exchanger can cause refrigerant to enter the water circuit, i.e. a secondary circuit (heating circuit) of the heat pump, which can then reach the building to be heated via the distribution system.

[0005] To prevent refrigerant from entering the building via the water circuit, various solutions for use in a heat pump are known (described, for example, in IEC 60335).

[0006] For example, a double-walled plate heat exchanger is used to transfer heat between two fluids, for example refrigerant and water.

[0007] In the event that refrigerant enters the water circuit due to an internal leak, for example due to water freezing, the refrigerant can be separated from the water, for example by a gas separator, and released into the environment.

[0008] A disadvantage of the current technology is that double-walled plate heat exchangers exhibit poor heat transfer. They are also complex to manufacture. To separate gas from the water circuit, additional components are required, which take up installation space and further increase manufacturing costs.

[0009] An underlying objective of the present invention is to provide a heat exchanger that addresses the above problems, i.e., in particular, one that has a simple and compact design, reducing the risk of leakage due to freezing water. At the same time, the water volume within the heat exchanger is increased such that it stores the amount of heat required for defrosting in sensible or latent form.

[0010] According to a first aspect of the invention, a heat exchanger is proposed as defined in claim 1, namely a heat exchanger for a heat pump with: a first guide for guiding a first fluid, and a second guide for guiding a second fluid, wherein the heat exchanger comprises a hollow body with a first cavity region, wherein the first guide runs at least partially through the first cavity region, wherein the first guide is defined in a spiral plane by a first spiral curve, wherein the second guide runs at least partially along the first cavity region and is defined in the spiral plane by a second spiral curve, wherein the first spiral curve and the second spiral curve are parallel curves in the spiral plane, wherein the heat exchanger is designed to transfer heat between the first fluid and the second fluid,and wherein the first guide comprises a plurality of chambers in a direction perpendicular to the spiral plane.,

[0011] The hollow body is preferably produced using an extrusion process, in particular as an extruded profile. This means that the hollow body is preferably produced as an elongated hollow body and then bent or rolled into a spiral-shaped hollow body.

[0012] According to a second aspect of the invention, a heat pump is proposed as defined in claim 16, namely a heat pump with a heat exchanger according to one of the embodiments described above or below, wherein refrigerant is conducted in the first conduit of the heat exchanger and wherein water is conducted in the second conduit of the heat exchanger. In particular, R290, i.e., propane, is provided as the refrigerant. The heat exchanger is preferably designed for use as a gas separator in a heat pump.

[0013] The heat pump preferably has a first circuit, wherein the first circuit is designed to carry a coolant, and a second circuit, wherein the second circuit is designed to carry water, wherein the first guide of the heat exchanger is then part of the first circuit and the second guide is part of the second circuit.

[0014] This makes it possible to provide a heat exchanger with a simple and compact design, which significantly reduces the risk of internal leakage, ie leakage of the first guide, due to freezing water.

[0015] The first guide is designed to guide a first fluid. Furthermore, the second guide is designed to guide a second fluid. The first guide and the second guide are preferably tubular, i.e., they each have an elongated hollow extension through which the corresponding fluid is guided.

[0016] The heat exchanger has a hollow body. The hollow body comprises at least a first cavity region, wherein the first guide runs at least partially through the first cavity region. This means that the first guide is defined by the cavity provided by the first cavity region. Features described in connection with the first guide therefore also apply to the hollow body and the first cavity region. The first guide is defined in a spiral plane by a first spiral curve. This means that the first guide runs spirally in the spiral plane. In other words, the hollow body is spiral, so that the first cavity region runs spirally. The spiral plane is defined by the spiral curve, this means that the spiral curve lies in a plane that is called the spiral plane. Planes parallel to the spiral plane can also be understood as a spiral plane.

[0017] The second guide runs at least partially along the hollow body or the first hollow area. This means that the second guide runs outside the first hollow area.

[0018] The second guide is defined in the spiral plane by a second spiral curve, i.e., the second guide is spiral-shaped. The first spiral curve and the second spiral curve are parallel curves. This means that the second guide runs along the first guide in the spiral plane. One end of one of the guides can differ from the corresponding end of the other guide, i.e., the two curves run parallel at least over a predefined area. For example, an inner end and / or an outer end of the first guide can have a bend and / or a straight section.

[0019] In particular, the first guide and the second guide are designed to transfer heat between the first fluid and the second fluid. This means that the hollow body is preferably made of a thermally conductive material. Furthermore, the first guide and the second guide are preferably arranged relative to one another in such a way that heat can be transferred from one of the fluids to another of the fluids.

[0020] The first guide comprises a plurality of spiral-shaped chambers extending in a direction perpendicular to the spiral plane. The chambers of the first guide are preferably closed off from one another. In particular, the chambers can also be understood as channels.

[0021] By dividing the entire cross-section of the first guide into a plurality of chambers, the mechanical stress (stress) on the hollow body and thus the wall thickness can be reduced at high internal pressures, so that a thinner wall thickness is required (compared to a first guide without chambers). The circular or square cross-section of the chambers prevents deformation of the first guide at high pressures, or at least reduces the likelihood of deformation. Furthermore, the number of chambers in each guide, i.e., across the height of the heat exchanger, allows the size of the heat exchanger to be scaled.

[0022] Preferably, the wall thickness of the chambers of the first guide is between 0.1 mm and 0.25 mm. Additionally or alternatively, a chamber cross-sectional width / chamber diameter is preferably between 1 and 2 mm, particularly preferably 1.5 mm. Further additionally or alternatively, a distance between two chambers running alongside one another (running one above the other), measured from a center point of each chamber, is preferably between 1.5 mm and 2.5 mm, particularly preferably 2 mm. A distance between two parts of a chamber, ie a radius of the spiral curve, is preferably substantially constant and particularly preferably between 8 and 12 mm, for example 10 mm.

[0023] The number of channels (one above the other) is preferably between 50 and 500, particularly preferably between 100 and 250.

[0024] In a preferred embodiment, a cross-section of the chambers of the first guide along the first spiral curve is round. Alternatively, a cross-section of the chambers of the first guide can also be angular, for example, rectangular or triangular.

[0025] In an advantageous embodiment of one aspect of the invention, the heat exchanger further comprises at least two housing parts. The two housing parts can be part of a housing of the heat exchanger (see below) or be provided in addition to a housing of the heat exchanger. The two housing parts are arranged parallel to the spiral plane on two opposite sides of the first guide and are in particular welded or soldered. The second guide can then be formed by an outer wall of the hollow body, i.e. by the first guide, and the two housing parts. I.e. the hollow body has a wall, wherein an inner wall of the wall forms the first guide and the outer wall (together with the two housing parts) forms the second guide.In the spiral shape of the hollow body, the outer wall comprises an inner outer wall directed toward a central region of the hollow body / first guide, and an outer outer wall directed opposite to the central region of the hollow body / first guide, i.e., directed outward. Alternatively, a flat wall can be provided along the outer wall, in particular the inner outer wall, of the first guide.

[0026] In an alternative advantageous embodiment, the hollow body comprises a second cavity region, wherein the second guide extends at least partially through the second cavity region. In a preferred embodiment, the second cavity is two-part. In other words, the second guide is defined by two (second) spiral curves. The two-part second cavity preferably extends along two sides of the first guide, i.e., in particular, along an inner outer wall and an outer outer wall of the hollow body.

[0027] In case the hollow body is manufactured as an extruded profile, the two housing parts or alternatively the second hollow body region are preferably part of the extruded profile.

[0028] In a further preferred embodiment of an aspect of the invention, the second guide also comprises a plurality of chambers in a direction perpendicular to the spiral plane. In particular, the first guide and the second guide each comprise a plurality of spirally extending chambers in a direction perpendicular to the spiral plane.

[0029] The chambers of the second guide are preferably each separated from each other. The size of the heat exchanger can then be scaled by the number of chambers in each guide, i.e., across the height of the heat exchanger.

[0030] In a preferred variant of the above embodiment, a cross-section of the chambers of the second guide along the second spiral curve is substantially rectangular, i.e. a cross-section of the chambers of the second guide is in particular substantially rectangular. “Substantially rectangular” here means that the cross-section is not necessarily described by a rectangle with straight, parallel sides, but can also be described, for example, by a rectangle with curved or wavy sides. This is in particular the case when the second guide is delimited by the outer wall of the first guide and the first guide comprises a plurality of chambers with a round cross-section, as a result of which the outer wall of the hollow body can then be curved.

[0031] In a further advantageous embodiment of an aspect of the invention, ribs are provided parallel to the spiral plane within the second guide. This means that the second guide has ribs within the second guide. In particular, the ribs are designed to divide the second guide into a plurality of chambers or channels. The ribs can extend completely or partially along the second spiral curve, with ribs that extend completely along the second spiral curve then forming chambers that are closed off from one another. In addition, the ribs serve to increase the surface area of ​​the hollow body that is in contact with the second fluid and thus to improve heat transfer between the first fluid and the second fluid. Additionally or alternatively, the first guide can also have ribs that extend completely or partially along the first spiral curve.The ribs in the first guide, when the ribs extend completely along the first spiral curve, can form the chambers that are closed off from each other.

[0032] If the hollow body is manufactured as an extruded profile, the ribs are preferably part of the extruded profile. In particular, the ribs then serve as spacers during the rolling process of the hollow body.

[0033] In a further advantageous embodiment of an aspect of the invention, the heat exchanger comprises at least one further hollow body. The hollow body can then be understood as the first hollow body and the further hollow body as the second hollow body. The shape of the second hollow body essentially corresponds to the shape of the first hollow body. The further / second hollow body thus has a further first cavity region, wherein the first guide is formed at least partially by the first cavity region of the (first) hollow body and the further first cavity region of the further / second hollow body. This means that the first guide is defined in the spiral plane by two first spiral curves. Furthermore, the second guide is defined in the spiral plane by two second spiral curves, wherein all of the two first spiral curves and the two second spiral curves are parallel curves.If the hollow body is manufactured as a profile, preferably an extruded profile, in particular an extruded profile, the first hollow body is a first profile and the further / second hollow body is a second profile, which are arranged in layers and can additionally be secured to one another, for example, via locking hooks. The heat exchanger is thus a multi-layer or multi-layer heat exchanger formed by several profiles (and possibly other components).

[0034] In a further advantageous embodiment of an aspect of the invention, the hollow body comprises a plurality of identically shaped hollow body parts arranged relative to one another in a direction perpendicular to the spiral plane. The hollow body is thus formed by the plurality of hollow body parts, each of the hollow body parts having the (same) properties as specified in the embodiments of the hollow body described above or below. The size or volume of the heat exchanger or of the first guide and the second guide can then be scaled, in particular, by the number of hollow body parts.

[0035] In a further advantageous embodiment of an aspect of the invention, the first guide has a first opening in a central region of the first guide. The central region of the first guide refers to a region around the center of the spiral, which is defined by the spiral-shaped hollow body. In particular, the first opening is arranged in a central region of the spiral-shaped hollow body or at an inner end of the spiral-shaped hollow body. The first opening does not necessarily have to be arranged in a center of the spiral, but merely in the interior of the spiral, preferably at the end of the hollow body. Furthermore, the first guide has a second opening in an outer region of the first guide. The outer region of the first guide refers to an outer region of the spiral, which is defined by the spiral-shaped hollow body.In particular, the second opening is arranged in an outer region of the spiral hollow body or at an outer end of the hollow body.

[0036] Additionally or alternatively, the second guide preferably has a third opening arranged in the central region of the first guide and a fourth opening arranged in the outer region of the first guide. The first opening and the second opening of the first guide and the third opening and the fourth opening of the second guide are not necessarily arranged adjacent to one another, but can be offset from one another along a guide direction.

[0037] In an advantageous variant of the above embodiment, the heat exchanger comprises a housing, wherein the hollow body, i.e., the first guide and the second guide, are arranged at least partially, preferably largely, within the housing. The housing is preferably cylindrical in shape. In particular, if no second hollow area is provided for the second guide, the housing is sealed so that water within the housing cannot escape from the housing (except via supply / discharge lines, pressure relief valves, etc.).

[0038] Particularly preferably, the first guide extends outward through the housing, so that the first opening and / or the second opening is located outside the housing. Additionally or alternatively, in one embodiment, the second guide extends outward through the housing, so that the third and / or fourth opening is located outside the housing.

[0039] The heat exchanger preferably has an inner first supply / discharge line which is connected to the first opening. Particularly preferably, the inner first supply / discharge line is welded or soldered to the first opening. Additionally or alternatively, the heat exchanger has an outer first supply / discharge line which is connected to the second opening. Particularly preferably, the outer first supply / discharge line is welded or soldered to the second opening. Preferably, the inner first supply / discharge line is arranged at least partially within the first guide and the outer first supply / discharge line is arranged outside the first guide, ie the inner first supply / discharge line is arranged in the central region of the first guide and the outer first supply / discharge line is arranged in the outer region of the first guide.Particularly preferably, the inner first supply / discharge line and / or the outer first supply / discharge line are arranged perpendicular to the spiral plane. The inner first supply / discharge line and the outer first supply / discharge line are provided and configured for supplying and discharging the first fluid. If a housing is provided, for example, a part of the hollow body, i.e., the first guide, and / or a part of at least one of the inner first supply / discharge line and the outer first supply / discharge line can lead out of the housing.

[0040] Furthermore, the heat exchanger preferably has an inner second supply / discharge line which is connected to the third opening, i.e. a first opening of the second guide. Particularly preferably, the inner second supply / discharge line is welded or soldered to the third opening. Additionally or alternatively, the heat exchanger has an outer second supply / discharge line which is connected to the fourth opening, i.e. a second opening of the second guide. Particularly preferably, the outer second supply / discharge line is welded or soldered to the fourth opening. The inner second supply / discharge line is preferably arranged at least partially within the first guide and the outer second supply / discharge line is preferably arranged outside the first guide, i.e. the inner second supply / discharge line is arranged in the central region of the first guide and the outer second supply / discharge line is arranged in the outer region of the first guide.Particularly preferably, the inner second supply / discharge line and / or the outer second supply / discharge line are arranged perpendicular to the spiral plane. The inner second supply / discharge line and the outer second supply / discharge line are provided and configured for supplying and discharging the second fluid. If a housing is provided, for example, a part of the hollow body, i.e., the first guide, and / or a part of at least one of the inner second supply / discharge line and the outer second supply / discharge line can lead out of the housing.

[0041] In a further preferred variant of the above embodiment, the heat exchanger has a housing, wherein the first guide and the second guide are arranged at least partially in the housing, and wherein the inner first supply / discharge line, the inner second supply / discharge line, the outer first supply / discharge line, and / or the outer second supply / discharge line are arranged outside the housing. In the event that an inner first supply / discharge line and / or an inner second supply / discharge line is arranged outside the housing, the inner first supply / discharge line and / or the inner second supply / discharge line is preferably arranged above the housing or the heat exchanger.

[0042] In a further preferred embodiment of an aspect of the invention, the heat exchanger has a pressure relief valve. The pressure relief valve has a fluid connection to the second guide. This means that the pressure relief valve is connected to the second guide either directly or indirectly, i.e. via a further region enclosing the second fluid. Preferably, the pressure relief valve is arranged at least partially within the hollow body, i.e. it projects downwards from a volume defined by the hollow body. More preferably, the pressure relief valve is arranged in the central region. This makes it possible to prevent the heat exchanger from bursting if the pressure within the second guide (or a further region enclosing the second fluid) increases.

[0043] In a further preferred embodiment of an aspect of the invention, the hollow body has locking hooks and corresponding locking recesses designed to lock together and fix the hollow body within them. This allows the hollow body to be held in the spiral position. Additionally or alternatively, locking hooks and corresponding locking recesses can be provided to connect two hollow body parts (at the same height as the heat exchanger) and / or two hollow bodies (multi-layer heat exchanger), which connect the two hollow body parts and / or the two hollow bodies to each other or fix them against each other.

[0044] In a further preferred embodiment of an aspect of the invention, a volume of the second fluid in the heat exchanger is greater than a volume of the first fluid, preferably more than twice as large, particularly preferably more than six times as large, for example twelve times as large.

[0045] In a further preferred embodiment of an aspect of the invention, the heat exchanger is produced in an extrusion process, in particular as an extruded profile. In particular, a corresponding heat exchanger can be understood as a microchannel heat exchanger. In one example, the heat exchanger is produced as a multi-layer extruded profile. This enables particularly simple production. Locking hooks can preferably be provided in the heat exchanger in order to attach housing parts to the heat exchanger, for example. This means that the locking hooks are then part of the extruded profile. Extruded profiles, i.e. individual channels of the first guide and / or second guide, such as a plurality of hollow bodies, can also be connected to one another at a height of the heat exchanger in this way. Additionally or alternatively, ribs, as described above or below, can also be part of the extruded profile.As an alternative to an extrusion manufacturing process, a roll bonding process is also conceivable for producing the heat exchanger or at least the first guide, i.e., the hollow body. The heat exchanger is preferably made of an aluminum or copper alloy. Additionally or alternatively, the heat exchanger surface can be coated.

[0046] In a further preferred embodiment of an aspect of the invention, the heat exchanger consists of an aluminum alloy or a copper alloy. Alternatively, the heat exchanger can also be made of plastic (extrudate), in which case thin-walled (metallic) tubes are provided in the chambers of the first guide.

[0047] The invention also relates to a use of an extruded profile with internal channels as a heat exchanger for a heat pump, wherein the extruded profile is rolled in a spiral shape.

[0048] According to a further aspect of the invention, a method for producing a heat exchanger is proposed, as defined in claim 18, namely a method for producing a heat exchanger, the method comprising the steps of: (i) producing an elongate hollow body, preferably an extruded profile, with a first cavity region which forms a first guide along the elongate hollow body for guiding a first fluid, (ii) rolling up the elongate hollow body so that the first guide is defined in a spiral plane by a spiral curve, wherein a second guide runs along the first cavity region, wherein the second guide is defined in the spiral plane by a second spiral curve, wherein the first spiral curve and the second spiral curve are parallel curves in the spiral plane.

[0049] In an advantageous embodiment in which the first guide has a first opening in a central region of the first guide and a second opening in an outer region of the first guide, the method preferably further comprises the step: (iii) connecting, preferably soldering, the first opening of the first guide to an inner first supply / discharge line and / or connecting, preferably soldering, the second opening of the first guide to a first outer supply / discharge line. If the first opening is not arranged within the central region of the first guide, the method alternatively comprises the step: (iii) connecting, preferably soldering, the first opening of the first guide to an outer supply / discharge line and / or connecting, preferably soldering, the second opening of the first guide to a further outer supply / discharge line.

[0050] In a further preferred embodiment, the method further comprises the steps of: (iv) arranging at least two housing parts parallel to the spiral plane on two opposite sides of the first guide and / or (v) arranging the heat exchanger within a housing.

[0051] Features of advantageous embodiments of the invention are defined in particular in the subclaims, wherein further advantageous features, embodiments and configurations can also be gathered by the person skilled in the art from the above explanation and the following discussion.

[0052] In the following, the present invention is further illustrated and explained with reference to exemplary embodiments shown in the figures. Fig. 1 is a schematic diagram illustrating part of a heat pump according to the prior art, Fig. 2 is a schematic diagram illustrating part of a heat pump according to a first embodiment, Fig. 3 is a schematic diagram illustrating part of a heat pump according to a second embodiment, Fig. 4 a schematic representation to illustrate a first embodiment of the heat exchanger according to the invention, Fig. 5 a schematic representation to illustrate a cross section of the first embodiment of the heat exchanger according to the invention, Fig. 6 a schematic representation to illustrate a cross section of a second embodiment of the heat exchanger according to the invention, Fig. 7a is a perspective view illustrating a cross-section of the second embodiment, Fig. 7b is a schematic diagram illustrating a cross section of a further embodiment, Fig. 8 is a schematic diagram illustrating a third embodiment of the heat exchanger according to the invention, Fig. 9 a schematic representation to illustrate a fourth embodiment of the heat exchanger according to the invention, Fig. 10 is a schematic diagram illustrating a fifth embodiment of the heat exchanger according to the invention, Fig. 11 a schematic representation to illustrate a housing for the heat exchanger according to the invention with a pressure relief valve, Fig. 12 a schematic representation to illustrate a sixth embodiment of the heat exchanger according to the invention, Fig. 13a is a schematic diagram illustrating a seventh embodiment after the first step of the method according to the invention for producing a heat exchanger, Fig. 13b is a schematic diagram illustrating the seventh embodiment after the second step of the method according to the invention for producing a heat exchanger, Fig. 13c is a schematic diagram illustrating the seventh embodiment after a third step of the method according to the invention for producing a heat exchanger, Fig. 14a is a schematic diagram illustrating an upper part of a housing for the heat exchanger according to the invention, Fig. 14b is a schematic diagram illustrating a lower part of a housing for the heat exchanger according to the invention, Fig. 15 is a schematic sectional view illustrating a housing with the seventh embodiment of the heat exchanger according to the invention from the side and from above, Fig. 16 an exploded view to illustrate a housing with the seventh embodiment of the heat exchanger according to the invention and Fig. 17 a schematic representation to illustrate another housing with a fifth embodiment of the heat exchanger according to the invention.

[0053] In the accompanying drawings and the explanations to these drawings, corresponding or related elements are - where appropriate - identified by corresponding or similar reference numerals, even if they are found in different embodiments.

[0054] Fig. Figure 1 shows a schematic diagram illustrating part of a heat pump 1000 according to the prior art. In particular, Fig. 1 shows a primary circuit 1100 for carrying a refrigerant and a secondary circuit 1200 for carrying water.

[0055] The primary circuit 1100 comprises a first heat exchanger 1110 in the form of an evaporator, a compressor 1120, a second heat exchanger 1130 in the form of a condenser, an expansion device 1140, and a refrigeration cycle reversing device 1150. The primary circuit 1100 is thermally connected to the secondary circuit 1200 via the heat exchanger 1130, wherein the heat exchanger 1130 can be, for example, a plate heat exchanger. In particular, the heat exchanger 1130 is understood as a condenser.

[0056] In the prior art, the secondary circuit 1200 comprises a gas separator 1210 and a shut-off device 1230 in the form of a check valve. The gas separator 1210 comprises a pressure relief valve 1250 and a quick vent 1270. The safety valve 1250 can be opened when a predefined threshold pressure is exceeded. The quick vent 1270 is designed to discharge any refrigerant that enters the gas separator 1210. These precautionary measures are provided in the prior art to discharge refrigerant that enters the secondary circuit, for example, in the event of a defect in the heat exchanger (due to freezing water). Reliable function of these components must be ensured over the service life of the heat pump. In addition, defrost heat for defrosting the evaporator must be taken from the consumer circuits, i.e., the water circuit.

[0057] Fig. Figure 2 shows a schematic diagram illustrating a portion of a heat pump 2000 according to a first embodiment. In particular, a heat exchanger 2130 according to the invention is provided here. This eliminates the need for a gas separator, a check valve, a quick vent, and a safety valve, as in Fig. 1. This means that the heat exchanger 2130 is designed so that it cannot freeze. Furthermore, the volume of water in the heat exchanger 2130 is larger, in particular at least twice as large as the volume of refrigerant.

[0058] Fig. Figure 3 shows a schematic diagram illustrating a portion of a heat pump 3000 according to a second embodiment. In particular, a heat exchanger 3130 according to the invention is provided here. In this embodiment, the heat exchanger 3130 comprises a subcooling loop.

[0059] Fig. 4 shows a schematic representation to illustrate a first embodiment of the heat exchanger according to the invention. The heat exchanger 100 is provided and configured for a heat pump. The heat exchanger 100 has a first guide 110 for guiding a first fluid, in particular a coolant, and a second guide 120 for guiding a second fluid, in particular water. The heat exchanger 100 comprises a hollow body 170 with a first cavity region 171, wherein the first guide 110 extends at least partially through the first cavity region 171. The first guide 110 is defined in a spiral plane by a first spiral curve. Furthermore, the first guide 110 has a first opening 111 in a central region 130 of the first guide 110 and a second opening 112 in an outer region of the first guide 110.

[0060] In this embodiment, the second guide 120 is formed by the first guide 110, i.e., by an (inner) outer wall of the first guide 110. The second guide 120 extends at least partially along the first cavity region 171. In other words, the second guide 120 is also formed by the hollow body 170, although the second guide 120 does not extend through the hollow body 170.

[0061] The first guide 110 has a plurality of chambers or channels in a direction perpendicular to the spiral plane, wherein the chambers or channels of the first guide are round along the first spiral curve. Alternatively, the chambers or channels of the first guide 110 could also be rectangular or triangular, i.e. have a rectangular or triangular cross-section. Various parameters can be changed via the geometry of the extruded profile. For example, the inner diameter of the chambers of the first guide, which is preferably 1.5 mm, the distance between them, which is preferably 2 mm, and the distance between the profiles, which is preferably 10 mm, can be varied. This influences parameters such as channel volume, flow resistance, and transfer area.

[0062] Preferably, the hollow body 170 is manufactured as an extruded profile.

[0063] The heat exchanger 100 has an inner first supply / discharge line 140, which is connected to the first opening 111 of the first guide 110. The heat exchanger 100 also has an outer first supply / discharge line 150. The inner first supply / discharge line 140 is arranged perpendicular to the spiral plane at least partially within the first guide 110, i.e., in particular in a central region of the hollow body 170 or in a central region of a spiral defined by the hollow body 170. The outer first supply / discharge line 150 is arranged outside the first guide 110, i.e., outside the hollow body 170 or the spiral.

[0064] The inner first supply / discharge line 140 and the outer first supply / discharge line 150 are arranged perpendicular to the spiral plane.

[0065] Fig. Figure 5 shows a schematic diagram illustrating a cross-section of the first embodiment of the heat exchanger according to the invention, in particular of the hollow body 170 or the first hollow body region 171. A plurality of chambers 113 of the first guide 110 can be seen in the cross-section of the heat exchanger 100. In this embodiment, the second guide 120 comprises only one chamber 121.

[0066] Fig. 6 shows a schematic representation illustrating a cross-section of a second exemplary embodiment of the heat exchanger according to the invention, in particular of a hollow body 270 or a first hollow body region 271. The heat exchanger 200 also has a first guide 210 with a plurality of chambers 213. In contrast to the heat exchanger 100, the heat exchanger 200 has a plurality of ribs (224) in the second guide 220, so that a plurality of chambers 223 are also present in the second guide 220. Furthermore, a further flat wall, arranged perpendicular to the spiral plane, can also be provided on the (inner) outer wall of the first guide 210 for the second guide 220. In addition, a bubble separator can be integrated into one of the heat exchangers according to the invention. This enables the removal of bubbles that can collect at the upper corners of the second guide.

[0067] Preferably, the hollow body 270 is manufactured as an extruded profile, wherein it is then further preferred that the ribs are also manufactured as part of the extruded profile.

[0068] In the embodiment shown, the heat exchanger 200 has two housing parts 250, 260, which are arranged parallel to the spiral plane on two opposite sides of the first guide 210 and delimit the second guide 220. The two housing parts 250, 260 can be fastened to the heat exchanger 200 or the first guide 210, for example, using locking hooks 251. Parts of the first guide 210 and / or the second guide 220, i.e. channels of the first guide 210 and / or the second guide 220 at a height of the heat exchanger 200, can also be connected using locking hooks. In particular, in the case that the hollow body 270 is manufactured as an extruded profile, the two housing parts 250, 260 are also manufactured as part of the extruded profile.

[0069] Fig. 7a and Fig. 7b show perspective views illustrating a cross section of the second embodiment and a further embodiment. In particular, Fig. 7a shows the second opening 212, which can be connected, in particular soldered, to an outer first supply / discharge line 250. In this embodiment, the chambers or channels are arranged directly above one another. Alternatively, chambers or channels can also be provided in which there is a spacing between some of the chambers or channels (see Fig. 7b). Spacing between some of the chambers of a heat exchanger 200' results in a spacing also being provided for the corresponding supply / discharge line 250'. Spacing can occur especially when several hollow body parts of the same shape are arranged relative to one another in a direction perpendicular to the spiral plane. By stringing together several shorter extruded profiles, tooling costs can be reduced. At the same time, greater flexibility is created when designing heat exchangers of different sizes.

[0070] Fig. 8 shows a schematic representation to illustrate a third embodiment of the heat exchanger according to the invention. The heat exchanger 300 has a (first) hollow body 370 with a first cavity region 371. The heat exchanger 300 also has a further hollow body 380 with a further cavity region 381. The first guide 310 and the second guide 320 are thus each designed in two parts. This means that the first guide 310 is formed by the first cavity region 371 of the hollow body 370 and the further cavity region 381 of the further hollow body 380. The first guide 370 is thus defined in the spiral plane by two first spiral curves, with the second guide 320 being defined in the spiral plane by two second spiral curves. All of the two first spiral curves and the two second spiral curves are parallel curves. The heat exchanger 300 can thus be understood as a multi-layer heat exchanger.Preferably, the first hollow body 370 and the second hollow body 380 are configured identically. Furthermore, it is preferred that the first hollow body 370 and the second hollow body 380 each be an extruded profile. If two or more extruded profiles are rolled over one another, the channel length is reduced by a factor of the number of profiles, and the flow velocity is reduced. This allows the flow resistance to be drastically reduced.

[0071] Fig. 9 shows a schematic diagram illustrating a fourth exemplary embodiment of the heat exchanger according to the invention. The heat exchanger 400 has a hollow body 470 with a first hollow body region 471. The heat exchanger 400 has a first guide 410 which leads through the first hollow region 471, wherein an inner end, i.e. an end which is arranged in an inner or central region of the hollow body 470, is extended and has a straight region. Furthermore, an outer end, i.e. an end which is arranged in an outer region of the hollow body 470 or the first guide 410, also has a bend and a straight region, so that the second opening 422 protrudes perpendicularly from an outer surface of the heat exchanger 400. This allows a simpler connection to a supply / discharge line to be established.Furthermore, the heat exchanger 400 has a second cavity region 472, wherein the second guide runs through the second cavity region 472. The second cavity region 472 is configured in two parts, i.e., the second guide 420 is configured in two parts and runs along two sides of the first guide 410. This means that the second guide 420 is arranged on both sides of the first guide 410. The two-part second guide 420 allows flow to pass through certain regions of the second guide 420, for example, the outer region of the second guide 420, and to prevent flow from passing through certain regions, for example, the inner region of the second guide 420.

[0072] Fig. 10 shows a schematic representation to illustrate a fifth embodiment of the heat exchanger according to the invention. The heat exchanger 500 comprises a hollow body 570 with a hollow region 571, wherein a first guide 510 runs through the hollow region 571. A second guide 520 runs along the first hollow region 571. The first guide 510 comprises chambers that have a round cross-section and the second guide 520 comprises chambers that have a rectangular cross-section 520. The heat exchanger 500 is arranged in a part of a housing 560, wherein an inner first supply / discharge line 520 is arranged partially and the outer first supply / discharge line 550 is arranged completely outside the housing 560. This has the advantage that the connections between the first guide and the respective supply / discharge line and / or possiblythe second guide and the respective supply / discharge line, which are preferably soldered connections, are located outside the housing and in the event of a leak the refrigerant does not escape into the water circuit.

[0073] Fig. Figure 11 shows a schematic diagram illustrating a housing for the heat exchanger according to the invention with a pressure relief valve. The housing 660 has an upper part 661 and a lower part 662. In addition, Fig. 11, the two housing parts 664 can be seen, which are arranged within the housing 660. In the upper part 661, a first opening 665 is also provided, around which a cylindrical pipe section extends. A pressure relief valve 663 is arranged within the housing 660. The housing is used in particular in connection with Fig. 14a to Fig. 17 described in detail.

[0074] The pressure relief valve 663 is arranged at least partially within the hollow body (not shown) of the heat exchanger. The pressure relief valve 663 has a fluid connection to the second guide. If the heat exchanger freezes from the outside to the inside, for example in the event of a prolonged power outage, the second fluid, for example liquid water, is trapped in the second guide. The trapped second fluid then expands upon freezing. To prevent the housing from bursting, a pressure relief valve is installed, preferably in the center of the heat exchanger, which guides the second fluid downwards out of the container.

[0075] Fig. 12 shows a schematic representation to illustrate a sixth embodiment of the heat exchanger according to the invention. In particular, a heat exchanger 700 with a first guide 710 and a second guide 720 in a housing 760 is shown here, which essentially corresponds to the heat exchanger 400, wherein a heat exchanger can also be provided which, in contrast to the heat exchanger 400, only partially has fins. In particular, the housing 760 comprises openings or pipe sockets, which can be provided for the supply / discharge line of the first guide and the second guide. In this embodiment, too, the supply / discharge lines are provided outside the housing. This example is intended to demonstrate the advantage for a heat pump that results when the supply line of the second fluid is arranged outside the housing. If a supply line of the second fluid, ieWhen the water is moved outward, a zone is created inside the heat exchanger that contains stagnant water and is not necessarily subject to flow. This water can be used to provide heat during defrosting. In subsequent heating operation, heat is added again through greater subcooling of the refrigerant.

[0076] The method for producing a heat exchanger 800 according to the invention is described below.

[0077] In a first step, an elongated hollow body 870, preferably an extruded profile, is produced with a first hollow region 871. In particular, the extruded profile is cut to length. The first hollow region 871 forms a first guide 810 along the elongated hollow body 870 for guiding a first fluid.

[0078] Fig. 13a shows a schematic diagram illustrating a seventh embodiment after the first step of the method according to the invention for producing a heat exchanger. In the embodiment shown, the heat exchanger comprises fins 824, which are also elongated and do not extend over the entire length of the cavity region 871. This means that the fins are preferably cut away at the ends of the extruded profile.

[0079] In a further step of the method according to the invention, the elongated hollow body 870 is rolled up so that the first guide 810 is defined in a spiral plane by a spiral curve. In this embodiment, the second guide 820 is thereby formed. To facilitate the rolling up of the extruded profile, the geometry of the profile can be adapted; for example, ribs can be incorporated into the profile to ensure a uniform spacing between the layers. At the same time, the distribution of the water volume flow across the height is improved.

[0080] Fig. 13b shows a schematic representation to illustrate the seventh embodiment after the second step of the method according to the invention for producing a heat exchanger 800.

[0081] In a preferred third step of the method, a first opening of the first guide 810, which is arranged in a central region of the first guide 810, is connected, in particular soldered, to an inner supply / discharge line 840. Furthermore, in the third step of the method, a second opening of the first guide 810, which is arranged in an outer region of the first guide 810, is preferably connected, in particular soldered, to an outer supply / discharge line 850.

[0082] Fig. 13c shows a schematic representation to illustrate the seventh embodiment after the third step of the method according to the invention for producing a heat exchanger.

[0083] One embodiment of the housing is described in more detail below. In particular, a housing can be provided as part of the heat exchanger.

[0084] Fig. 14a shows a schematic diagram illustrating an upper part of a housing for the heat exchanger according to the invention. The upper part 861 of the housing 860 is designed in several parts in this embodiment. In particular, the upper part 861 of the housing 860 comprises an upper housing part 863, which is required to form the second guide. In addition, the upper part 861 of the housing 860 comprises pipe sockets 865 for an inner second supply / discharge line and an outer second supply / discharge line. Furthermore, holes are provided in the upper part of the housing, which can be used for the passage of, for example, the inner first supply / discharge line and the outer first supply / discharge line.

[0085] Fig. Figure 14b shows a schematic diagram illustrating a lower part of a housing for the heat exchanger according to the invention. The lower part 862 comprises a round trough part and a lower housing part 864, which is required to form the second guide. The lower housing part 864 is preferably designed as a plate-shaped insert.

[0086] Fig. 15 shows a schematic sectional view to illustrate a housing with the seventh embodiment of the heat exchanger according to the invention from the side and from above. Fig. 16 shows an exploded view illustrating a housing with the seventh embodiment of the heat exchanger according to the invention. Fig. 17 shows a schematic diagram illustrating another housing with a fifth embodiment of the heat exchanger according to the invention. Fig.15 to 17 thus show the heat exchanger 800 installed in the housing 860. In particular, the heat exchanger 800 is soldered into the housing 860.

[0087] Although various aspects or features of the invention are shown in combination in the figures, it will be apparent to those skilled in the art—unless otherwise stated—that the illustrated and discussed combinations are not the only possible ones. In particular, corresponding units or feature complexes from different embodiments can be interchanged.

[0088] Further considerations regarding the invention follow: During the development of a new air-water heat pump series using R290 as refrigerant, the problem was recognized that a defect in the plate heat exchanger (general defect / defect due to freezing water) can cause refrigerant to enter the secondary circuit (heating circuit) of the heat pump, which can then enter the house via the distribution system.

[0089] The current state of the art is the use of double-walled plate heat exchangers, which discharge the refrigerant into the atmosphere in the event of an internal leak. Alternatively, the refrigerant can be separated from the water via a gas separator after entering the water circuit and discharged into the atmosphere.

[0090] A disadvantage of the current technology is that double-walled plate heat exchangers exhibit poorer heat transfer. Furthermore, they are complex to manufacture. To separate gas from the water circuit, additional components are required, which, in particular, require additional installation space.

[0091] In both cases, the refrigerant is released into the environment, so additional requirements such as avoiding ignition sources are necessary.

[0092] The object of the current invention is to transfer heat between refrigerant and water and to reduce the risk of leakage of the heat exchanger due to freezing water through the structural design. This is preferably achieved by using a hollow body produced by extrusion (extrusion molding) as the heat exchanger, which contains the refrigerant-carrying channels. By rolling up the extrudate, the water-carrying channel is formed between the layers of the extrudate. A further preferred feature of the heat exchanger is that the volume on the water side (second guide) is significantly larger than the volume on the refrigerant side (first guide). In this respect, the heat exchanger is highly asymmetrical. The water volume inside acts like a small buffer storage.

[0093] In a preferred embodiment, an extruded profile with internal channels (first guide) is rolled up spirally, thus forming a compact heat exchanger. A first fluid, such as the refrigerant, then flows through the channels. The rolling process creates additional channels (second guide) between the extruded profiles, through which the water flows.

[0094] The two ends of the extruded profile are preferably soldered into a pipe through which the refrigerant is supplied and discharged (first supply / discharge line). The water is also preferably supplied and discharged via pipes inside and around the edge of the coil (second supply / discharge line).

[0095] That is, in one embodiment, the invention relates to the use of an extruded profile with internal channels, which is rolled spirally and thus forms a heat exchanger.

[0096] Preferably, the heat exchanger is arranged in a housing, wherein the housing is then preferably also part of the water-carrying channel, ie for example a part of the second guide, or at least directly encloses the second fluid.

[0097] The invention reduces the risk of leakage when water freezes in the heat exchanger. Furthermore, the volume of the refrigerant-carrying part of the heat exchanger can be (slightly) reduced and the volume of the water-carrying part of the heat exchanger can be (significantly) increased.

[0098] Furthermore, flow resistance in the water-carrying channel can be reduced, and the weight of the heat exchanger can be kept low. Furthermore, additional components for separating refrigerant in the water circuit can be avoided. Furthermore, the water volume in the heat exchanger can be used to store defrost heat.

[0099] The invention can be used in all heat pumps, preferably as a condenser but also as an internal heat exchanger or latent heat storage device.

[0100] In another preferred embodiment, several profiles can be combined to form a heat exchanger. This allows for easy variation of the heat exchanger.

[0101] Furthermore, ribs can be incorporated into the second guide to improve heat transfer. Additionally or alternatively, locking hooks can be provided to connect housing parts or parts of the first guide / second guide without the need for screws. Further variations include: multi-layer extruded profiles, integrated water-carrying channels in the extruded profile, soldered joints at the end of the extruded profile outside the container, integration of a pressure relief valve to prevent damage if the water freezes (during a prolonged power outage), integration of an air separator and quick vent, and only partial flow through the first guide and / or the second guide when channels are provided.

[0102] The heat exchanger according to the invention reduces the risk of leakage due to freezing water.

[0103] Further advantages of the invention include: low refrigerant volume, high water volume, low flow resistance, low system weight, low system costs (also due to the elimination of additional components in the heat pump), and high efficiency (good thermal conductivity of aluminum, low pressure drop on the water and refrigerant sides). Furthermore, with the heat exchanger according to the invention, defrost heat is available independently of the heating system.

[0104] The heat exchanger according to the invention can also be used in a heat pump, for example as a gas separator, as an internal heat exchanger in the refrigeration circuit, as a heat exchanger in the drinking water storage tank, as a latent heat storage tank in the refrigeration circuit, etc.

[0105] The invention relates to a heat exchanger for a heat pump with: a first guide for guiding a first fluid, and a second guide for guiding a second fluid, wherein the heat exchanger comprises a hollow body with a first cavity region, wherein the first guide runs at least partially through the first cavity region, wherein the first guide is defined in a spiral plane by a first spiral curve, wherein the second guide runs at least partially along the first cavity region and is defined in the spiral plane by a second spiral curve, wherein the first spiral curve and the second spiral curve are parallel curves in the spiral plane, wherein the heat exchanger is designed to transfer heat between the first fluid and the second fluid.

Claims

[1] Heat exchanger (100, 200, 300, 400, 500, 700, 800) for a heat pump with: a first guide (110, 210, 310, 410, 510, 710, 810) for guiding a first fluid, and a second guide (120, 220, 320, 420, 520, 720, 820) for guiding a second fluid, wherein the heat exchanger (100, 200, 300, 400, 500, 700, 800) comprises a hollow body (170, 270, 370, 470, 570, 770, 870) with a first cavity region (171, 271, 371, 471, 571, 771, 871), wherein the first guide (110, 210, 310, 410, 510, 710, 810) extends at least partially through the first cavity region (171, 271, 371, 471, 571, 771, 871), wherein the first guide (110, 210, 310, 410, 510, 710, 810) is defined in a spiral plane by a first spiral curve, wherein the second guide (120, 220, 320, 420, 520, 620, 720, 820) extends at least partially along the first cavity region (171, 271, 371, 471, 571, 771, 871) and is defined in the spiral plane by a second spiral curve, wherein the first spiral curve and the second spiral curve are parallel curves in the spiral plane, wherein the heat exchanger (100, 200, 300, 400, 500, 700, 800) is designed to transfer heat between the first fluid and the second fluid, and wherein at least the first guide (110, 210, 310, 410, 510, 710, 810) comprises a plurality of chambers (113, 213, 223) in a direction perpendicular to the spiral plane. [2] Heat exchanger (100, 200, 300, 400, 500, 700, 800) according to claim 1, wherein a cross section of the chambers (113, 213, 313) of the first guide (110, 210, 310, 410, 510, 710, 810) along the first spiral curve is round. [3] Heat exchanger (100, 200, 300, 500, 700, 800) according to one of claims 1 and 2, wherein the heat exchanger (100, 200, 300, 400, 500, 700, 800) further comprises at least two housing parts (250, 260, 664, 863, 864) which are arranged parallel to the spiral plane on two opposite sides of the first guide (110, 210, 310, 410, 510, 710, 810) and wherein the second guide (120, 220, 320, 420, 520, 720, 820) is formed by an outer wall of the hollow body (170, 270, 370, 470, 570, 770, 870) and the two housing parts (250, 260, 664, 863, 864). [4] Heat exchanger (400) according to one of claims 1 and 2, wherein the hollow body (470) comprises a second cavity region (472), wherein the second guide (420) extends at least partially through the second cavity region (472), wherein preferably the second cavity region (472) is two-part and extends along two sides of the first guide (410). [5] Heat exchanger (100, 200, 300, 400, 500, 700, 800) according to one of the preceding claims, wherein the second guide (120, 220, 320, 420, 520, 720, 820) also comprises a plurality of chambers (113, 213, 223) in a direction perpendicular to the spiral plane, wherein preferably a cross section of the chambers (223) of the second guide (120, 220, 320, 420, 520, 720, 820) along the second spiral curve is substantially rectangular. [6] Heat exchanger (100, 200, 300, 400, 500, 700, 800) according to one of the preceding claims, wherein ribs (224) are provided parallel to the spiral plane within the first guide (110, 210, 310, 410, 510, 710, 810) and / or the second guide (120, 220, 320, 420, 520, 720, 820). [7] Heat exchanger (100, 200, 300, 400, 500, 700, 800) according to claim 6, wherein the heat exchanger (100, 200, 300, 400, 500, 700, 800) comprises at least one further hollow body (380), wherein the first guide (110, 210, 310, 410, 510, 710, 810) extends at least partially through the first cavity region (171, 271, 371, 471, 571, 771, 871) of the hollow body (170, 270, 370, 470, 570, 770, 870) and a further first cavity region (381) of the at least one further hollow body (380), wherein the first guide (110, 210, 310, 410, 510, 710, 810) is defined in the spiral plane by two first spiral curves, wherein the second guide (120, 220, 320, 420, 520, 720, 820) is defined in the spiral plane by two second spiral curves, and wherein all of the two first spiral curves and the two second spiral curves are parallel curves. [8] Heat exchanger (100, 200, 300, 400, 500, 700, 800) according to one of the preceding claims, wherein the hollow body (170, 270, 370, 470, 570, 770, 870) comprises a plurality of identically shaped hollow body parts arranged relative to one another in a direction perpendicular to the spiral plane. [9] Heat exchanger (100, 200, 300, 400, 500, 700, 800) according to one of the preceding claims, wherein the first guide (110, 210, 310, 410, 510, 710, 810) has a first opening (111) in a central region (130) of the first guide (110, 210, 310, 410, 510, 710, 810) and a second opening (112, 212) in an outer region of the first guide (110, 210, 310, 410, 510, 710, 810) and / or wherein the second guide (120, 220, 320, 420, 520, 720, 820) has a third opening in the central region (130) of the first guide (110, 210, 310, 410, 510, 710, 810) and a fourth opening in the outer region of the first guide (110, 210, 310, 410, 510, 710, 810). [10] Heat exchanger (100, 200, 300, 400, 500, 700, 800) according to claim 9, wherein the heat exchanger (100, 200, 300, 400, 500, 700, 800) has a housing (560, 660, 760, 860), wherein the first guide (110, 210, 310, 410, 510, 710, 810) and the second guide (120, 220, 320, 420, 520, 720, 820) are arranged at least partially in the housing (560, 660, 760, 860), wherein preferably the first guide (110, 210, 310, 410, 510, 710, 810) and / or the second guide (120, 220, 320, 420, 520, 720, 820) is guided outwards through the housing (560, 660, 760, 860), so that the first opening (111) and / or the second opening (112, 212) is arranged outside the housing (560, 660, 760, 860). [11] Heat exchanger (100, 200, 300, 400, 500, 700, 800) according to one of claims 9 and 10, wherein the heat exchanger (100, 200, 300, 400, 500, 700, 800) has an inner first supply / discharge line (140, 840) which is connected, preferably welded or soldered, to the first opening (111) and an outer first supply / discharge line (150, 250, 850) which is connected, preferably welded or soldered, to the second opening (112, 212), wherein the inner first supply / discharge line (140, 840) is at least partially within the first guide (110, 210, 310, 410, 510, 710, 810) is arranged and wherein the outer first supply / discharge line (150, 250, 850) is arranged outside the first guide (110, 210, 310, 410, 510, 710, 810), wherein preferably the inner first supply / discharge line (140, 840) and / or the outer first supply / discharge line (150, 250, 850) is arranged perpendicular to the spiral plane and / or wherein the heat exchanger (100, 200, 300, 400, 500, 700,800) has an inner second supply / discharge line that is connected, preferably welded or soldered, to the third opening and an outer second supply / discharge line that is connected, preferably welded or soldered, to the fourth opening, wherein the inner second supply / discharge line is arranged at least partially within the first guide (110, 210, 310, 410, 510, 710, 810) and wherein the outer second supply / discharge line is arranged outside the first guide (110, 210, 310, 410, 510, 710, 810), wherein preferably the inner second supply / discharge line and / or the outer second supply / discharge line is arranged perpendicular to the spiral plane. [12] Heat exchanger (100, 200, 300, 400, 500, 700, 800) according to claim 11, wherein the heat exchanger comprises a housing (560, 660, 760, 860), wherein the first guide (110, 210, 310, 410, 510, 710, 810) and the second guide (120, 220, 320, 420, 520, 720, 820) are arranged at least partially in the housing (560, 660, 760, 860) and wherein the inner first supply / discharge line (140, 840), the inner second supply / discharge line, the outer first supply / discharge line (150, 250, 850) and / or the outer second supply / discharge line is arranged outside the housing (560, 660, 760, 860). [13] Heat exchanger (100, 200, 300, 400, 500, 700, 800) according to one of the preceding claims, wherein the heat exchanger (100, 200, 300, 400, 500, 700, 800) further comprises a pressure relief valve (663), wherein the pressure relief valve (663) has a fluid connection with the second guide (120, 220, 320, 420, 520, 720, 820) and wherein the pressure relief valve (663) is preferably arranged at least partially within the hollow body (170, 270, 370, 470, 570, 770, 870). [14] Heat exchanger (100, 200, 300, 400, 500, 700, 800) according to one of the preceding claims, wherein the hollow body (170, 270, 370, 470, 570, 770, 870) has locking hooks (251) and corresponding locking recesses which are designed to lock together and to fix the hollow body (170, 270, 370, 470, 570, 770, 870) in place. [15] Heat exchanger (100, 200, 300, 400, 500, 700, 800) according to one of the preceding claims, wherein the heat exchanger (100, 200, 300, 400, 500, 700, 800) is produced in an extrusion process, preferably as an extruded profile, particularly preferably as a multi-layer extruded profile. [16] Heat pump with a heat exchanger (100, 200, 300, 400, 500, 700, 800) according to one of claims 1 to 15, wherein refrigerant is guided in the first guide (110, 210, 310, 410, 510, 710, 810) and wherein water is guided in the second guide (120, 220, 320, 420, 520, 720, 820). [17] Use of an extruded profile with internal channels as a heat exchanger (100, 200, 300, 400, 500, 700, 800) for a heat pump, wherein the extruded profile is spirally rolled. [18] A method for producing a heat exchanger, the method comprising the steps of: Producing an elongated hollow body, preferably an extruded profile, with a first cavity region which forms a first guide along the elongated hollow body for guiding a first fluid, Rolling up the elongated hollow body so that the first guide in a spiral plane is defined by a spiral curve, wherein a second guide extends along the first cavity region, wherein the second guide is defined in the spiral plane by a second spiral curve, where the first spiral curve and the second spiral curve are parallel curves in the spiral plane, and wherein at least the first guide comprises a plurality of chambers in a direction perpendicular to the spiral plane. [19] The method of claim 18, wherein the first guide has a first opening in an inner region and a second opening in an outer region of the first guide, the method further comprising the step of: Connecting, preferably soldering, the first opening of the first guide to an inner first supply / discharge line and / or connecting, preferably soldering, the second opening of the first guide to a first outer supply / discharge line. [20] A method according to any one of claims 18 and 19, wherein the method further comprises the steps of: Arranging at least two housing parts parallel to the spiral plane on two opposite sides of the first guide and / or Arranging the heat exchanger within a housing.

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