Heat exchanger

Abstract

The invention relates to a heat exchanger having a housing and a heat exchanger tube. The heat exchanger tube is arranged in the interior of the housing, and the housing has two cover plates, a hollow cylindrical outer wall with a cylinder axis, and at least two screws, wherein the outer wall extends between the cover plates such that the two cover plates extend substantially perpendicularly to the cylinder axis, and the two screws clamp the cover plates against the outer wall in the axial direction.

Description

[0001] heat exchanger

[0002] Technical area

[0003] The present disclosure relates to a heat exchanger comprising a housing and a heat exchanger tube, wherein the heat exchanger tube is arranged in an interior space of the housing.

[0004] Technological background

[0005] Heat exchangers are used to transfer thermal energy from one material flowing in the heat exchanger tube to another material located inside the housing, or vice versa. This process is used in many technical fields, such as air conditioning, cooling technology in industrial production plants, or in energy technology for handling liquefied gas.

[0006] In the chemical and pharmaceutical industries, for example, heat exchangers are used in which liquid nitrogen is passed through the heat exchanger tube, cooling a heat transfer medium inside the heat exchanger housing. The heat transfer medium can then be used, for example, to cool a reactor. This offers the advantage that the liquid nitrogen does not come into direct contact with the materials being produced. This allows for better control of the temperature of the production process, reduces the risk of severe overcooling of the product mixture, and prevents excessive liquid nitrogen consumption.

[0007] Heat exchangers are used in various applications when handling liquefied gas. Heat exchangers are used for cooling or liquefying fluids, for example, but are also used for heating or re-evaporation. Fluids include both gases and liquids. Helium, hydrogen, argon, or nitrogen are particularly used in heat exchanger tubes.

[0008] When using a heat exchanger, high pressure often exists in the heat exchanger tube and the interior of the heat exchanger housing, which the heat exchanger housing must withstand. For process temperatures in the low-temperature range, high-alloy stainless steels are generally used, which are designed as seamlessly as possible as the housing or heat exchanger tube. Individual components of the heat exchanger housing are precisely welded using state-of-the-art devices to ensure sufficient pressure stability.

[0009] To ensure the long-term safety of the heat exchanger, regular maintenance of the housing and the heat exchanger tube is required. For the previously mentioned welded housings, this means welding the housing before maintenance and re-welding it afterward. This results in a significant amount of time for maintenance.

[0010] The present disclosure is therefore based on the aspect of providing a heat exchanger which facilitates the maintenance of the interior of the housing, but at the same time offers sufficient pressure stability for various applications.

[0011] Summary of Revelation

[0012] The aspect underlying the present disclosure is achieved by a heat exchanger according to the appended independent claim. To this end, the housing of the heat exchanger has the initially mentioned two cover plates, a hollow cylindrical outer wall with a cylinder axis, and at least two screws. The outer wall extends between the cover plates so that the two cover plates extend substantially perpendicular to the cylinder axis, and the two screws clamp the cover plates against the outer wall in the axial direction.

[0013] In contrast to heat exchangers known from the prior art, the housing of the heat exchanger according to the disclosure comprises several components that are clamped together simply by a screw connection. Welding of the components is not necessary, so maintenance is carried out by separating the components from one another by loosening the screws. This leads to significant time savings in the maintenance of the heat exchanger according to the disclosure. At the same time, the two screws that clamp the cover plates axially against the outer wall ensure that the housing has sufficient pressure stability.

[0014] Preferably, the at least two screws for clamping the cover plates against the outer wall are passed through corresponding openings in a first of the two cover plates and engaged with the second cover plate, so that the cover plates are clamped toward each other. Alternatively, in a further embodiment, the outer wall has a first collar and a second collar, with which the screws for clamping the cover plates against the outer wall are engaged.

[0015] Various screw designs can be used for screw connections to ensure sufficient tension of the cover plates against the outer wall.

[0016] In one embodiment, a through-bolt is used for each of the two screws. This through-bolt is inserted through a through-hole in the second cover plate and tightened with a nut. It is understood that the screw head is larger than the diameter of the opening in the first cover plate, thus enabling tightening.

[0017] Alternatively, in one embodiment, the screws are a threaded rod, each end of which is clamped against the two cover plates by a nut. In both embodiments, the nut can also be designed as a hydraulic nut.

[0018] Alternatively, in one embodiment, a thread is provided in one of the cover plates with which the screw is engaged.

[0019] In another embodiment, the housing has at least three screws that clamp the cover plates against the outer wall. The more screws clamping the cover plates, the more evenly the clamping force is transferred to the outer wall of the housing, preventing deformation of the outer wall.

[0020] In a further embodiment, the two screws are expansion screws which are pre-tensioned so that they tension the cover plates towards each other and against the outer wall even when the heat exchanger and thus the material of the screws heats up. An expansion screw is an elastically expandable screw characterized by a shaft which has a thinner diameter than a threaded section of the screw and acts according to the principle of a pre-tensioned tension spring. This offers the advantage that the tensile force exerted by the screw changes only slightly, even due to plastic deformation of the screw, e.g. due to thermal heating, and the pressure stability of the disclosed housing is thus ensured even at different temperature ranges. The respective expansion screw rests positively on the cover plates with its head or a nut attached to it.In a further embodiment, at least one of the two screws has a defined breaking strength to protect the heat exchanger against excess pressure in the housing. Therefore, if the pressure in the interior of the housing exceeds a certain value, the screws break and the pressure escapes from the interior of the housing. This increases the operational reliability of the heat exchanger according to the disclosure.

[0021] In a further embodiment, the two cover plates and the outer wall are at least two, preferably three, separate parts that are not integrally connected to one another. This simplifies maintenance when not all parts are integrally connected. For example, in one embodiment, one of the covers is integrally connected to the outer wall, while the second cover is a separate part.

[0022] In one embodiment, an annular first groove is formed in a surface of one of the two cover plates, the outer wall extending into the first groove in the axial direction.

[0023] In a further embodiment, an annular first groove is formed in a surface of each of the two cover plates, with the outer wall extending axially into each of the two first grooves. This results in the outer wall being securely clamped between the cover plates.

[0024] In a further embodiment, the first groove, but in particular each of the two first grooves, has a substantially U-shaped cross-sectional profile in a radial plane spanned by the cylinder axis and a radius perpendicular to the cylinder axis. It is understood that other cross-sectional profiles, such as a V-shaped cross-sectional profile or a square cross-sectional profile, are also possible for the design of the first groove or grooves.

[0025] In one embodiment, the first groove, in particular each of the two first grooves, has two mutually facing annular sidewall surfaces, wherein a first O-ring seal is arranged in the first groove, in particular in each of the two first grooves, such that the first O-ring seal is in sealing contact with a first of the two sidewall surfaces and the outer wall. In one embodiment, the first O-ring seal is in sealing contact with the first of the second sidewall surfaces, with the outer wall, and with a groove base of the groove.

[0026] In one embodiment, the O-ring seal is recessed into the first of the two sidewall surfaces of each of the two first grooves. In one embodiment, the outer wall is chamfered at its ends. In one embodiment, the outer wall in the first groove or grooves extends, tapering toward a groove base of the respective groove. An embodiment with a chamfer or taper creates space for receiving a first O-ring seal between a sidewall surface of the respective first groove, the groove base, and the outer wall.

[0027] In a further embodiment, a second O-ring seal is arranged in the first groove, in particular in each of the two first grooves, such that the second O-ring seal is in sealing contact with a second of the two side wall surfaces and the outer wall. The second O-ring seal is accommodated in the groove in addition to the first O-ring seal. In one embodiment, the second O-ring seal is embedded in the second of the two side wall surfaces of the first groove, in particular in each of the two first grooves.

[0028] The O-ring seals ensure that the medium is held securely in the interior of the housing.

[0029] In one embodiment, the outer wall is chamfered on two sides at its end extending into the first groove, so that the outer wall tapers toward the base of the first groove. This creates space for the first and second O-ring seals.

[0030] In one embodiment, the groove base of the first groove transitions into the first sidewall surface, with which the first O-ring seal engages, in a rounded manner. In another embodiment, the groove base of the first groove transitions into the second sidewall surface, with which the second O-ring seal engages, in an additionally rounded manner. Such a rounding enhances the sealing effect of the O-ring seals because it complements the cross-sectional shape of the seal.

[0031] In one embodiment, the respective rounded transition between the groove base and the first and / or second sidewall surface has a radius of curvature. In one embodiment, the radius of curvature is at least 1 / 3 of the diameter of the O-ring seal.

[0032] The arrangement of the outer wall in a groove of the cover plates also offers the advantage that a leakage of the heat exchanger housing can be easily detected in the area of ​​the groove when the medium penetrates from the interior of the housing into the space formed by the groove between the first O-ring seal and the second O-ring seal.

[0033] In one embodiment, the heat exchanger therefore has a housing leak detector, wherein the housing leak detector is configured and arranged such that it detects a leak in the housing during operation of the heat exchanger, wherein the housing leak detector is in fluid communication with at least one of the two first grooves via a housing leak detector line, wherein the housing leak detector line opens into a region of the respective groove sealed by the two O-ring seals.

[0034] In one embodiment, the housing leak detector is a pressure sensor. In one embodiment of the invention, the area of ​​the respective first groove between the two O-ring seals is at ambient pressure during operation of the heat exchanger. If a leak occurs, the pressure in the respective first groove between the first O-ring seal and the second O-ring seal increases. This pressure increase is detected by the pressure sensor.

[0035] In a further embodiment, the housing has a hollow cylindrical inner wall, with the outer wall concentrically surrounding the inner wall, so that the interior of the housing is annular. In a further embodiment, the cover plates are also annular, so that the heat exchanger has a passage in the center, which is enclosed by the inner wall and through which, for example, lines or fastening elements are passed.

[0036] In one embodiment, an annular second groove is formed in the surface of one of the two cover plates, with the inner wall extending into the second groove in the axial direction. In one embodiment, an annular second groove is formed in the surface of each of the two cover plates, with the inner wall extending into each of the second grooves in the axial direction.

[0037] It is understood that in one embodiment, the configuration of the second grooves and the seal between the respective second groove and the outer wall are the same as those of the first grooves, as previously described in embodiments thereof. This also applies in particular to the configuration of the housing leak detector, whose housing leak detector line, in one embodiment, is in fluid communication with one of the two second grooves.

[0038] In one embodiment, each of the first and second grooves is in fluid communication with a housing leak detector via a housing leak detector conduit.

[0039] In a further embodiment, the heat exchanger has a heat exchanger tube leak detector, wherein the heat exchanger tube leak detector is configured and arranged such that it detects a leak in the heat exchanger tube during operation of the heat exchanger, wherein the heat exchanger tube leak detector is in fluid communication with the interior of the housing via a heat exchanger tube leak detector line, and wherein the heat exchanger tube leak detector line opens into the interior.

[0040] The heat exchanger tube leak detector is preferably a pressure detector or pressure sensor, or a gas sensor, such as a helium detector. This allows for reliable detection of whether the substance flowing through the heat exchanger tube is penetrating the interior of the housing.

[0041] State-of-the-art heat exchangers are typically designed as tube bundle exchangers. A bundle of parallel tube sections, which carry a first medium during heat exchanger operation, is guided through a volume containing a second medium. For this purpose, the first medium is distributed within the heat exchanger housing to the individual tubes of the tube bundle by means of a distributor. This design has the disadvantage that the structure cannot be designed to withstand high pressure.

[0042] In one embodiment of the invention, in contrast to this prior art, the heat exchanger tube carrying the first medium is completely sealed within the housing and, due to its construction, is permanently technically sealed. In one embodiment, the heat exchanger tube is a seamless tube, i.e., the heat exchanger tube has no longitudinal seam. In one embodiment, the heat exchanger tube is a cold-formed, seamless tube. In one embodiment, the heat exchanger tube has no seams at all within the housing, in particular no welds or solder joints. Such a heat exchanger tube is referred to as completely seamless.

[0043] In such a permanently technically sealed construction, the medium carried in the heat exchanger tube never enters the housing due to its design, but is carried exclusively in the heat exchanger tube within the housing.

[0044] In one embodiment, the high-pressure resistance of the structure within the housing is ensured exclusively by the design of the heat exchanger tube. High-pressure resistance means that the heat exchanger tube can withstand an internal pressure of 300 bar or more. The housing itself, however, must only withstand the pressure of the second medium. In one embodiment, the pressure of the second medium is lower than the pressure of the first medium.

[0045] In one embodiment, the heat exchanger tube is a work-hardened, non-heat-treated tube. This type of heat exchanger tube manufacturing optimizes the wall thickness relative to the internal operating pressure. In another embodiment, the heat exchanger tube is passed through one of the two cover plates. In particular, in another embodiment, the passage is realized using a cutting ring fitting.

[0046] In a further embodiment, the heat exchanger tube is spiral-shaped. This increases the surface area of ​​the heat exchanger tube, which allows for a particularly effective transfer of thermal energy from the heat exchanger tube to the medium in the interior of the heat exchanger.

[0047] Possible materials for the heat exchanger tube, especially if helium or hydrogen flows through the heat exchanger tube in one embodiment, are TP316L, HP120 or HP160.

[0048] Short character description

[0049] Further advantages, features, and possible applications of the present disclosure will become clear from the following description of two embodiments and the accompanying figures. Identical components are provided with the same reference numerals.

[0050] The foregoing general description, as well as the following detailed description of the embodiments, will be better understood when read in conjunction with the accompanying figures. It should be understood that the illustrated embodiments are not limited to the precise arrangements shown.

[0051] Figure 1 a shows a schematic representation of a section parallel to the cylinder axis through a first variant of a heat exchanger.

[0052] Figure 1 b shows a section of the lower left corner of the variant shown in Figure 1 a

[0053] Figure 2 shows a schematic representation of a section parallel to the cylinder axis through a second variant of a heat exchanger.

[0054] Figure 3 shows a schematic representation of a section parallel to the cylinder axis through a third variant of a heat exchanger.

[0055] Detailed Description The heat exchanger 1 shown in Figures 1 a and 1 b comprises a housing 2 and a heat exchanger tube 3 arranged in the interior 4 of the housing 2. The heat exchanger tube 3 is spiral-shaped and made of TP316L or HP120.

[0056] The housing 2 is formed from two cover plates 2a, 2b and a hollow cylindrical outer wall 2c, which enclose the interior space 4. The hollow cylindrical outer wall 2c is arranged cylindrically around a cylinder axis 100, to which the two cover plates 2a, 2b extend essentially perpendicularly. The heat exchanger tube 3 extends through both of the two cover plates 2a, 2b. The two cover plates 2a, 2b and the outer wall 2c are separate components that are clamped together by eight screws 5a, 5b (only two screws 5a, 5b are visible in the sectional view shown).

[0057] The screws 5a, 5b are designed such that they are passed through an opening in a first 2a of the two cover plates 2a, 2b, wherein a diameter of the screw head of the screws 5a, 5b is selected such that the screws 5a, 5b cannot be passed completely through the opening in the first cover plate 2a. In the second 2b of the two cover plates 2a, 2b, a further through-opening is provided for the screws 5a, 5b, through which a threaded section of the screws 5a, 5b is passed. At the end of each threaded section, a hydraulic nut is provided, with which the cover plates 2a, 2b are clamped towards one another and against the outer wall 2c. Alternatively, the screws 5a, 5b are threaded rods, each of which is clamped at its end against the cover plates 2a, 2b and the outer wall 2c by a nut.

[0058] To accommodate the outer wall 2c, a first groove 21a, 21b is provided in the surface 20a, 20b of the cover plates 2a, 2b, into which the outer wall 2c extends in the axial direction.

[0059] By clamping the cover plates 2a, 2b against the outer wall 2c, a pressure-stable housing 2 is achieved, which meets the requirements of low-temperature applications for heat exchangers 1 and at the same time offers simplified maintenance options.

[0060] The screws 5a, 5b are preferably pre-tensioned expansion screws, so that they clamp the cover plates 2a, 2b toward each other and against the outer wall 2c even when the heat exchanger 1, and thus the screws 5a, 5b, heat up. Furthermore, the screws 5a, 5b have a defined breaking strength to ensure that the heat exchanger 1 is protected against breakage if the pressure in the interior 4 of the housing 2 exceeds a certain value. To seal the interior 4 of the housing 2, a first O-ring seal 61a, 61b and a second O-ring seal 62a, 62b are arranged in the first grooves 21a, 21b.The first grooves 21 a, 21 b have a substantially U-shaped cross-sectional profile in a radial plane spanned by the cylinder axis 100 and a radius 101 perpendicular to the cylinder axis 100, so that each of the two first grooves 21 a, 21 b has two annular side wall surfaces 221 a, 221 a', 221 b, 221 b' facing each other. The side wall surfaces 221 a, 221 a', 221 b, 221 b' are designed such that the first O-ring seals 61 a, 61 b ​​are in contact with the first 221 a, 221 b of the respective two side wall surfaces 221 a, 221 a', 221 b, 221 b' and the second O-ring seals 62 a, 62 b are in contact with the second 221 a', 221 b' of the respective two side wall surfaces 221 a, 221 a', 221 b, 221 b'. As a result, the first and second O-ring seals 61 a, 61 b, 62 a, 62 b are each in contact with the outer wall 2 c and the respective side wall surfaces 221 a, 221 a', 221 b, 221 b' of the first grooves 21 a, 21 b.Furthermore, it can be seen, particularly from Figure 1b, that the ends of the outer wall 2c are chamfered to accommodate the first and second O-ring seals 61a, 61b, 62a, 62b in the first grooves 21a, 21b. This configuration creates a space for receiving the respective O-ring seal 61a, 61b, 62a, 62b between a side wall surface 221a, 221a', 221b, 221b', the chamfer of the outer wall 2c, and the groove base of the groove 21a, 21b.

[0061] To detect a leak in the housing 2, the heat exchanger 1 also has a housing leak detector 6, which is fluidly connected to at least one of the two first grooves 21a, 21b via a housing leak detector line 7, wherein the housing leak detector 7 opens into a region 8 of the respective groove 21a, 21b sealed by the two O-ring seals 61a, 62a and 61b, 62b, respectively. Through this arrangement, the housing leak detector 6 detects, for example, a pressure change in the sealed region 8 when medium from the interior 4 penetrates into the actually sealed region 8.

[0062] Furthermore, the heat exchanger 1 in Figure 1 has a heat exchanger tube leak detector 9, which is fluidly connected to the interior 4 via a heat exchanger tube leak detector line 10. For example, the heat exchanger tube leak detector 9 is a gas sensor that detects a specific gas in the interior 4 that flows through the heat exchanger tube 3 and unintentionally escapes from it.

[0063] The variant of the heat exchanger shown in Figure 2 differs from the variant shown in Figures 1a and 1b in that the outer wall 2c has a first collar 32a and a second collar 32b which protrudes from the outer wall 2c in the direction of the radius 101, wherein the screws 5a, 5b are brought into engagement with the collars 32a, 32b of the outer wall 2c in order to prestress the cover plates 2a, 2b against the outer wall 2c. The heat exchanger 1 shown in Figure 3 differs from the heat exchanger 1 shown in Figures 1a and 1b only in that the housing 2 further has a hollow cylindrical inner wall 2d, wherein the outer wall 2c concentrically surrounds the inner wall 2d, so that the interior 4 of the housing 2 is annular. The heat exchanger tube 3 winds in a spiral shape and the inner wall 2d of the housing 2.

[0064] To clamp the inner wall 2d, the surface 20a, 20b of the two cover plates 2a, 2b each has a second groove 22a, 22b into which the inner wall 2d extends in the axial direction. For the sake of simplicity, the seal of the inner wall 2d has not been provided with reference numerals. However, the structure is analogous to that described for the outer wall 2c and also has a first and a second O-ring seal, which are in contact with the inner wall and the side wall surfaces of the second grooves 22a, 22b.

[0065] List of reference symbols

[0066] 1 heat exchanger

[0067] 2 housings

[0068] 2a, 2b cover plates

[0069] 2c exterior wall

[0070] 2d interior wall

[0071] 3 heat exchanger tube

[0072] 4 Interior

[0073] 5a, 5b screws

[0074] 6 Housing leak detector

[0075] 7 Housing leak detector line

[0076] 8 sealed area

[0077] 9 Heat exchanger tube leak detector

[0078] 10 Heat exchanger tube leak detector line

[0079] 20a, 20b Surface of the cover plates

[0080] 21a, 21b first grooves

[0081] 22a, 22b second grooves

[0082] 32a, 32b Collar of the outer wall

[0083] 61a, 61b first O-ring seals

[0084] 62a, 62b second O-ring seals

[0085] 100 cylinder axis

[0086] 101 radius

[0087] 221a, 221b, 221a',221b' Side wall surfaces of the first grooves

Claims

Patent claims Heat exchanger (1) comprising a housing (2) and a heat exchanger tube (3), wherein the heat exchanger tube (3) is arranged in an interior space (4) of the housing (2), characterized in that the housing (2) has two cover plates (2a, 2b), a hollow cylindrical outer wall (2c) with a cylinder axis (100) and at least two screws (5a, 5b), wherein the outer wall (2c) extends between the cover plates (2a, 2b) so that the two cover plates (2a, 2b) extend substantially perpendicular to the cylinder axis (100), and wherein the two screws (5a, 5b) clamp the cover plates (2a, 2b) in the axial direction against the outer wall (2c). Heat exchanger (1) according to one of the preceding claims, wherein the two screws (5a, 5b) are expansion screws which are pre-tensioned so that they tension the cover plates (2a, 2b) towards each other and against the outer wall even when the heat exchanger (1) is heated.Heat exchanger (1) according to one of the preceding claims, wherein at least one of the two screws (5a, 5b) has a defined breaking strength for forming a fracture protection device for the heat exchanger (1) against excess pressure in the housing (2). Heat exchanger (1) according to one of the preceding claims, wherein the two cover plates (2a, 2b) and the outer wall (2c) are at least two, preferably three separate parts that are not integrally connected to one another. Heat exchanger (1) according to one of the preceding claims, wherein an annular first groove (21a, 21b) is recessed into a surface (20a, 20b) of each of the two cover plates (2a, 2b), wherein the outer wall (2c) extends into each of the two first grooves (21a, 21b) in the axial direction. Heat exchanger (1) according to the preceding claim, wherein each of the two first grooves (21 a, 21 b) has a substantially U-shaped cross-sectional profile in a radial plane spanned by the cylinder axis (100) and a radius (101) perpendicular to the cylinder axis (100), so that preferably each of the two first grooves (21 a, 21 b) has two annular side wall surfaces (221 a, 221 a', 221 b, 221 b') facing each other, wherein in each of the two first grooves (21 a, 21 b) a first O-ring seal (61 a, 61 b) is arranged such that the first O-ring seal (61 a, 61 b) is in sealing contact with a first (221 a, 221 b) of the two side wall surfaces (221 a, 221 a', 221 b, 221 b') and the outer wall (2c).Heat exchanger (1) according to the preceding claim, wherein in each of the two first grooves (21 a, 21 b) a second O-ring seal (62a, 62b) is arranged such that the second O-ring seal (62a, 62b) is in sealing contact with a second (221 a', 221 b') of the two side wall surfaces (221 a, 221 ', 221 b, 221 b') and the outer wall (2c). Heat exchanger (1) according to the preceding claim, wherein the outer wall (2c) in the first groove (21 a, 21 b) tapers towards a groove bottom of the first groove, so that the first O-ring seal (21 a) is in contact with the tapered outer wall (2c), the first side wall surface (221 a, 221 b) and the groove bottom, and that the second O-ring seal (21 b) is in contact with the tapered outer wall (2c), the second side wall surface (221 a', 221 b') and the groove bottom.Heat exchanger (1) according to claim 7 or 8, wherein the heat exchanger (1) has a housing leak detector (6), wherein the housing leak detector (6) is configured and arranged such that it detects a leak in the housing (2) during operation of the heat exchanger (1), wherein the housing leak detector (6) is in fluid communication with at least one of the two first grooves (21a, 21b) via a housing leak detector line (7), wherein the housing leak detector line (7) opens into a region (8) of the respective groove (21a, 21b) sealed by the two O-ring seals (61a, 61b). Heat exchanger (1) according to one of the preceding claims, wherein the housing (2) has a hollow-cylindrical inner wall (2d), wherein the outer wall (2c) concentrically surrounds the inner wall (2d), so that the interior space (4) of the housing (2) is annular. Heat exchanger (1) according to the preceding claim, wherein an annular second groove (22a, 22b) is recessed into the surface (20a, 20b) of each of the two cover plates (2a, 2b), wherein the inner wall (2d) extends into each of the second grooves (22a, 22b) in the axial direction. Heat exchanger (1) according to one of the preceding claims, wherein the heat exchanger (1) has a heat exchanger tube leak detector (9), wherein the heat exchanger tube leak detector (9) is configured and arranged such that it detects a leak in the heat exchanger tube (3) during operation of the heat exchanger (1), wherein the heat exchanger tube leak detector (9) is in fluid communication with the interior (4) of the housing (2) via a heat exchanger tube leak detector line (10), and wherein the heat exchanger tube leak detector line (10) opens into the interior (4).Heat exchanger (1) according to one of the preceding claims, wherein the heat exchanger tube (3) extends through at least one of the two cover plates (2a, 2b). Heat exchanger (1) according to one of the preceding claims, wherein the heat exchanger tube (3) is a completely seamless tube, at least within the housing (2). Heat exchanger (1) according to one of the preceding claims, wherein the heat exchanger tube (3) is spiral-shaped.

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