EP3825636A1 - Échangeur de chaleur et son procédé de fabrication ou de conception - Google Patents

Échangeur de chaleur et son procédé de fabrication ou de conception Download PDF

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Publication number
EP3825636A1
EP3825636A1 EP20208451.3A EP20208451A EP3825636A1 EP 3825636 A1 EP3825636 A1 EP 3825636A1 EP 20208451 A EP20208451 A EP 20208451A EP 3825636 A1 EP3825636 A1 EP 3825636A1
Authority
EP
European Patent Office
Prior art keywords
pipe
sections
finned tube
ribs
pipe sections
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20208451.3A
Other languages
German (de)
English (en)
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EP3825636B1 (fr
Inventor
Stefan Leutloff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schmoele GmbH
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Schmoele GmbH
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Filing date
Publication date
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Publication of EP3825636A1 publication Critical patent/EP3825636A1/fr
Application granted granted Critical
Publication of EP3825636B1 publication Critical patent/EP3825636B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F28D7/1615—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation the conduits being inside a casing and extending at an angle to the longitudinal axis of the casing; the conduits crossing the conduit for the other heat exchange medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/34—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely
    • F28F1/36—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely the means being helically wound fins or wire spirals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2200/00—Prediction; Simulation; Testing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2210/00—Heat exchange conduits
    • F28F2210/08—Assemblies of conduits having different features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00—Fins
    • F28F2215/04—Assemblies of fins having different features, e.g. with different fin densities

Definitions

  • the invention relates to a method for manufacturing or designing a heat exchanger.
  • a heat exchanger is a device that transfers thermal energy from one material flow to another.
  • the substances are usually fluids, i.e. liquids or gases.
  • one of the substances is a liquid (e.g. water), the other a gas (usually air).
  • the component that separates the substances must have good thermal conductivity and, in particular, a large surface.
  • the component is usually provided by pipe sections in which one of the substances, typically a liquid, is guided.
  • a typical heat exchanger has spiral fin tube sections which are bundled to form compact heat exchangers.
  • Spiral rib tubes are thin-walled, metallic tubes that have spiral or helical ribs to increase the surface area.
  • the density of ribs is also known as the "rib pitch" and has a significant influence on the thermal properties.
  • the idea of the invention consists in using tube sections with different ribs to produce the heat exchanger.
  • the sections can, for example, have different rib inclinations.
  • the ribs of the pipe sections can each have a different height.
  • the pipe sections can have ribs made of a different material.
  • the aforementioned or other parameters are selected on the basis of information that the designer or manufacturer has obtained about the heat exchange behavior of the pipe sections (especially in the area of the fins) depending on their arrangement in the heat exchanger:
  • pipe sections which, according to said information (for example due to their arrangement) have particularly good heat exchange behavior can be ribbed particularly closely and / or provided with particularly high ribs, because it is particularly worthwhile for these pipe sections.
  • At least two of the pipe sections should have different ribs in comparison to one another.
  • all pipe sections can also have different ribs.
  • a pipe section is not provided with ribs at all (for example in the event that this is not worthwhile).
  • the selection of the different ribs is made on the basis of information that is typically obtained or created in a previous method step.
  • This information preferably takes into account the pipe section arrangement (in the heat exchanger).
  • the pipe section arrangement relates in particular to the arrangement of the pipe sections to one another or to one another.
  • the direction of flow of the fluid flowing outside the pipe sections can advantageously be taken into account.
  • the arrangement of the pipe sections is specified depending on the installation space or customer requirements. In other cases a standard pipe section arrangement may be chosen or one any, even optimized, arrangement can be made. This arrangement is then typically the basis for the information on the heat exchange behavior or has a significant influence on it.
  • Corresponding information can be obtained by carrying out simulations (in particular computer-aided) or, alternatively or additionally, by carrying out tests (on real test arrangements).
  • the information obtained or created relates to the heat exchange behavior of the pipe sections, in particular pipe sections can be determined which enable or have better heat exchange behavior or better heat transfer between the two substances or fluids in the specified or selected arrangement.
  • the specified pipe section positions can be stored or entered and based on assumptions about the direction of flow of the external medium (i.e. the fluid that is located outside the pipe sections and is currently not being conducted into them), knowledge about the heat exchange behavior of the different finned pipe sections can then be obtained.
  • the external medium i.e. the fluid that is located outside the pipe sections and is currently not being conducted into them
  • a predetermined rib height can initially be assumed in the simulation.
  • the rib height can then be adjusted.
  • Such a program can display the result of a simulation in particular graphically, preferably color-coded.
  • the display can show data on the simulated or calculated heat exchange behavior in the area of the finned tube sections, in particular relating to the heat flow (for example, values relating to the heat flow density can be displayed in a color-adjusted manner).
  • the method according to the invention relates in particular to the production of a heat exchanger in the sense that, in principle, a method step could also be provided in which the differently ribbed pipe sections are combined to form a heat exchanger or housed or installed in a heat exchanger housing or the like.
  • the method according to the invention is only used for drafting or designing a heat exchanger, for example in the event that a user only wants to determine data about the arrangement to be selected (or the ribs to be used) for a specific application (but not the heat exchanger itself but only forwards the data created about the design of the heat exchanger or the design of the heat exchanger - internally or externally).
  • a heat exchanger according to the invention has at least two (differently) ribbed pipe sections.
  • the heat exchanger can also have more pipe sections than two (for example four, six, eight or even more pipe sections). In any case, two of these must differ in terms of their ribbing.
  • the finned tube sections are arranged next to one another in the heat exchanger, that is to say essentially assigned to one another. Only in this case does it make sense to obtain information, for example in the context of a simulation.
  • the ribbed pipe sections are preferably arranged parallel to one another. This is the typical configuration of a tube bundle in a heat exchanger and is also easy to obtain or creating information, for example as part of a simulation.
  • the finned tube sections can be assigned to completely separate finned tubes:
  • a heat exchanger can have several tube sections which - at least within the heat exchanger housing - are not connected to one another.
  • the invention also includes pipe sections that actually belong to the same finned tube:
  • straight, parallel pipe sections can be provided by a meander-shaped overall finned tube:
  • the individual finned tube sections are arranged straight and parallel to one another. But these are all part of the same overall finned tube.
  • a number of such total finned tubes can also be provided in a heat exchanger.
  • An overall finned tube that is, for example, helical is also conceivable.
  • Individual turns (or turn sections) can represent the pipe sections which run next to one another (and in particular essentially parallel to one another).
  • the pipe sections are essentially straight (their main direction of extent therefore extends along a straight line).
  • the pipe sections can in particular be arranged offset to one another or in alignment with one another.
  • the base bodies of the pipe sections are typically made of copper (or another suitable metal, in particular stainless steel).
  • the ribs can then, for example, consist of the same material (that is to say also copper) or another suitable material, in particular stainless steel (aluminum can also be used as a strip material).
  • the ribs of a pipe section are advantageously provided by more than one band (in particular by two bands or more).
  • a finned tube section can be completed much more quickly given a given distance between two adjacent fins.
  • the belts can have a higher gradient for the same amount of time (for example, twice as high in the case of two belts as in the prior art method, in which only one belt is arranged on the finned tube).
  • the strips that provide the ribs are typically welded to the basic pipe bodies with the aid of (at least) one laser.
  • the basic pipe body of a pipe section is typically provided by an externally smooth round pipe, which is in the form of a straight line or rod-like, and which is then further processed, in particular ribbed.
  • the ribbed band is then attached to the basic pipe body, usually with the aid of a laser, typically in a helical shape.
  • the ribs of the pipe sections in comparison to one another have a different height.
  • at least one pipe section has a different rib height than another pipe section.
  • the height of the ribs essentially corresponds to the width of the strip that is used to create the ribs.
  • ribs of the pipe sections consist of a different material.
  • a first tube section can be provided which has a rib made of a first material and a second tube section which has a rib made of a different material.
  • the rib materials can be, for example, stainless steel or copper or titanium or aluminum or similar materials.
  • the different materials can advantageously be a rustproof material and a non-rustproof material.
  • heat exchangers can be produced which are only equipped with rustproof (more expensive) ribs for areas of high humidity. In this way, expensive alloys in particular can be saved.
  • an individual pipe section it is also possible for an individual pipe section to have strips made of different materials, so that the ribs of this pipe section, for example, consist of a first and consist of a second material.
  • a configuration according to the invention is particularly advantageous in which the ribs of the pipe sections have a different pitch compared to one another.
  • at least one pipe section is provided with a first pitch, and another or second pipe section with a different pitch.
  • the pitch indicates the number of ribs per unit of length (for example inches). The higher the slope, the closer the ribs are together and the more rib material is used.
  • the pipe sections originate from the same pipe. In particular, they were cut off from this original pipe. This means that at least two pipe sections still belonged together to one pipe before a cutting process. After the separation process, for example after cutting off or cutting through or the like, the pipe sections are then used separately in the heat exchanger as (separate) pipe sections.
  • the pipe from which the at least two pipe sections originate is preferably already finned before a cutting process takes place. This facilitates manufacturability.
  • the tube is ribbed in a varying manner, in particular in a gradually varying manner. This enables particularly easy and economical producibility, since in this way pipe sections originating from a pipe or can be separated, which have a different slope to one another. The manufacturing process is kept as simple as possible, since only one tube is actually used.
  • the original pipe can be designed in particular straight or as a straight line in terms of its longitudinal extension.
  • the separated pipe sections then also have a straight shape in terms of their longitudinal extension.
  • a (straight) pipe a few meters long can be ribbed in one piece (preferably ribbed in varying degrees) in this way.
  • a first area of the finned tube can have a first slope, a second area a second slope (possibly a third area, a third slope, etc.).
  • a separation process can then then take place, which separates the first area from the second (and possibly the second from the third, etc.).
  • the pipe can be cut off.
  • each pipe section then has a constant slope, the slope of the pipe sections varying in comparison to one another.
  • Such a varying rib pitch of the original pipe body can in particular be achieved in that one of the The variable tape guide developed by the applicant is used, which can vary the angle of incidence of the tape or tapes during the welding process.
  • the primary pipe can preferably be separated, in particular cut, evenly or into pieces of equal length. This enables the production of a bundle of pipe sections of equal length.
  • At least one pipe section is not ribbed at all based on the information mentioned.
  • it can be decided that it makes no sense at all to rib a certain pipe section, for example because it does not have any noteworthy heat exchange behavior or the like. In this way, a particularly large amount of rib strip material can be saved.
  • the ribs of at least one pipe section consist of at least two strips. Ribbons are typically welded to pipe bodies to produce ribs. The width of the band determines the height of the rib, for example.
  • the ribs of a pipe section are provided by at least two strips, which are typically formed separately (that is in this case in particular that these run parallel to one another, preferably helically).
  • the ribs assigned to one side of the pipe section are always provided alternately by one of the bands.
  • This embodiment has the particular advantage that it facilitates a varying rib incline for the ribbing of the original pipe (from which the pipe sections can be cut out).
  • it is difficult to achieve a varying, in particular a gradually varying, rib pitch on a pipe if only one band is used.
  • This embodiment thus enables a significantly more reliable control of the rib fastening process, which in the end also enables varying rib slopes in a reliable manner.
  • a ribbed original pipe can be produced, which is then divided into several pipe sections by a cutting process, which in turn can be built into the heat exchanger, so that the individual pipe sections actually have different slopes compared to each other.
  • the information on the heat exchange behavior of the pipe sections can preferably be obtained by means of a computer-aided simulation.
  • a computer program can be used, for example a computer program that can be executed on a conventional PC, notebook, tablet, mobile phone or the like.
  • pipe sections can preferably be arranged according to certain specifications, and on the basis of this arrangement the heat exchange behavior of these pipe sections can be calculated taking into account the flow behavior of the fluid flowing outside the pipe sections.
  • the simulation can, of course, take into account any parameters that can be sensibly selected for the simulation, such as the type of flowing medium, the direction of flow, condensation effects and / or a prescribable rib height.
  • Such a simulation can advantageously be offered, embedded or executed as a tool or app or the like in a CAD program.
  • This has the advantage that the designer who operates the CAD program can use the information obtained via this simulation directly to define different ribs for different pipe sections and to specify, save or take into account directly in the CAD program.
  • the simulation tool is integrated into a design program.
  • the results of the simulation are displayed directly to the CAD program user, in particular color-coded, in order to clarify the calculated / expected heat exchange behavior of the pipe sections.
  • Such a computer-aided program can particularly advantageously be calibrated, adapted or configured at the factory or by the user by taking real measurement data into account. A measurement can thus take place in an actual wind tunnel or the like, and these real results can then be taken into account in order to adjust, correct or calibrate the computer-aided simulation.
  • the object on which the invention is based is achieved by a heat exchanger according to claim 10, which accordingly has the peculiarity that the finned tube sections are ribbed differently.
  • the heat exchanger thus has finned tube sections which are provided with different fins.
  • the rib height and / or the slope of the ribs and / or the material of the ribs can differ.
  • the heat exchanger can in particular also have a housing or the like, or corresponding connections for the finned tube sections and / or for the substance conducted within the finned tubes.
  • heat exchangers in which the pipe sections have a different pitch and / or a different height and / or a different material compared to one another should also be considered to be disclosed.
  • the pipe sections can belong to the same pipe or come from the same pipe. Regardless of this, they can be formed separately - at least within the housing. For example, they can then be brought together outside the housing (or inside) for a common connection or drain or the like. This list is to be understood explicitly but not conclusively.
  • Fig. 1a shows first a very schematic side view of a first embodiment of a heat exchanger 10 according to the invention.
  • the heat exchanger 10 essentially consists of a housing 11 with an inlet 12 and an outlet 13 for a first fluid 14 flowing through the housing of the heat exchanger, which can in particular be a gas, for example air, such as smoke air or the like.
  • the first fluid 14 flows from the inlet 12 to the outlet 13 of the housing 11 and flows around a finned tube bundle 15 in the main flow direction H.
  • Such a finned tube bundle 15 typically consists of a plurality of finned tube sections 16 arranged next to one another.
  • FIG. 1a two finned tube sections 16a and 16b are shown by way of example, which in this exemplary embodiment are straight and are arranged parallel to one another.
  • the main direction of extent E, or the longitudinal extent of the finned tube sections 16, is oriented transversely or orthogonally to the main direction of flow H of the first fluid 14.
  • the finned tube sections 16 run through the interior of the housing 11 so transversely to the main flow direction H.
  • the finned tube sections 16 are aligned with the outlets 17 of the housing 11, respectively.
  • Seals not shown may be arranged to seal the interior of the housing 11 from the atmosphere.
  • the finned tube sections 16 can be continued as desired.
  • further tubes in particular smooth tubes, can be connected to the finned tube sections and can further transport a second fluid 18 transported in the finned tube sections 16.
  • Fig. 1a deliberately leaves open with the dashed lines outside the housing 11 whether the channels formed by the finned tube sections 16a and 16b are brought together outside the housing 1a (as with regard to FIG Fig. 1a indicated below the housing 11) or whether these are continued separately (as with respect to Fig. 1a indicated above the housing 11).
  • This is not important for the main aspect of the invention. Rather, it is important that the second fluid is transported within the finned tube sections 16, whereby it is the second fluid can, for example, be a liquid such as water or the like.
  • the heat exchanger 10 enables heat to be transferred between the first fluid 14 inside the housing 11 (but outside the finned tube sections 16) and the second fluid 18 inside the finned tube sections 16 Surface of the pipe section) ribs 19.
  • These ribs 19 are provided by bands that run in a spiral around the respective pipe section, which bands are typically welded to the pipe section base body (in particular with the aid of lasers).
  • the ribs 19, or bands can typically consist of copper or stainless steel or another suitable material.
  • the basic pipe bodies of the finned pipe sections 16 are usually made of stainless steel or copper or some other suitable material, in particular metal.
  • Fig. 1a is identical for both finned tube sections 16a and 16b
  • the finned tube sections 16a and 16b differ according to the invention in that they have a different fin pitch.
  • the rib slope essentially describes the density of the ribs, that is to say the number of ribs per unit of length (for example per inch or per centimeter or the like).
  • the finned tube section 16a has a higher fin pitch than the finned tube section 16b. This has in particular to do with the fact that the finned tube section 16a is closer to the inlet of the first fluid than the second finned tube section 16b. It is based on the assumption that the heat flow density or the heat flow behavior at the fins 19a of the first finned tube section 16a tends to be greater than at the fins 19b of the second finned tube section 16b.
  • the heat transfer takes place here between the first fluid 14 and the second fluid 18, in the exemplary embodiment according to FIG Fig. 1a for example from the first gaseous fluid 14 to the liquid fluid 18 conducted in the finned tube sections 16.
  • the water conducted in the tubes 16 is heated by hot gas 14.
  • the efficiency of the heat exchanger can be increased by assigning more strip material to the finned tube section 16a and less to the finned tube section 16b (assuming that the same amount of strip material is to be used as with an even distribution of the strip material between the two finned tube sections 16).
  • the ribs 19a and 19b can be formed from just a single band. But there is also the Possibility that the ribs 19a and / or 19b are each formed by a plurality of strips, which then typically run parallel in a helical manner.
  • FIG. 1b shows, for the sake of completeness, a very schematic, sectioned plan view of the device 10 according to FIG Fig. 1a , approximately along the view arrows Ib in Fig. 1a.
  • Figure 1b clearly shows that the finned tube bundle 15 does not only consist of a pair of finned tube sections 16a and 16b, but typically a larger number, namely in the illustrated case of exemplary four finned tube sections 16a to 16d (in practice, however, these are actually for a finned tube bundle 15 even more finned tube sections are provided).
  • finned tube sections 16 shown for the finned tube bundle is merely an example of an offset arrangement of the tubes.
  • an aligned pipe arrangement or an aligned offset pipe arrangement can also be provided.
  • two rows of finned tube sections are provided.
  • finned tube bundles 15 actually have more rows, in particular each with more tube sections than two in a row.
  • the configuration is in accordance with Figures 1a and 1b only to be understood as very exemplary.
  • FIG. 1a can also Figure 1b it can be seen that the finned tube sections 16a and 16b (like the other finned tube sections 16c and 16d) each have the same fin height h.
  • the finned tube sections 16 differ, however - as also to Fig. 1a executed - in the rib slope, which in the plan according to Figure 1b is indistinguishable. But it is related to this it is acceptable that the finned tube section 16c should have a higher pitch than the finned tube sections 16d and 16b.
  • the finned tube sections 16 are provided with different slopes, based on information that the user himself has created on the basis of considerations and assumptions (finned tube sections in an arrangement closer to the inlet 12 ensure a more effective heat exchange).
  • the applicant has found that a computer-aided simulation of the heat transfer behavior, in particular the heat flux density, on the fins can provide particularly meaningful information about the fins to be selected for a finned tube section:
  • Fig. 2 a schematic representation of the result of a computer-aided simulation of the heat flow density along the fins 19 of finned tube sections 16, in a configuration approximately according to FIG Figure 1b .
  • the result of the computer-aided simulation demonstrably shows Fig. 2 a broken window area, for example in the manner of a flow channel, a main flow direction H for the first fluid 14 being specified.
  • Fig. 2 shows here an example of the distribution of the heat flux density at the ribs 19 of the four exemplary finned tube sections 16 given the specification of specific parameters that are not specified at this point.
  • the fins 19a and 19c of the finned tube sections 16a and 16c have much higher heat flux densities and therefore also participate more effectively in a heat transfer between the two fluids (inside and outside the finned tube sections) than the fins 19b and 19d of the finned tube sections 16b and 16d.
  • rib slope instead of or in addition to the rib slope, other rib parameters can also be changed depending on the simulation results (to achieve a more effective heat exchanger or to save strip material):
  • FIG. 3 shows Fig. 3 in a very schematic plan view, which roughly corresponds to the plan view Figure 1b corresponds to a second embodiment 10 'of a heat exchanger according to the invention.
  • the finned tube sections 16 are shown in FIG Fig. 3 identical in terms of their position to those in terms of their position Figure 1b arranged in a housing 11. Instead of or in addition to a different rib inclination, the finned tube sections 16 now have different fin heights h - which can be seen very clearly in the top view Fig.
  • this finned tube section 16a has now been assigned a particularly large fin height h 1 , which is, for example, much greater than the fin height h 2 of the finned tube section 16d following in the flow direction H. In this way, finned tube material can be saved in the finned tube section 16d, which in any case does not take part particularly effectively in a heat transfer.
  • ribs are completely dispensed with in this finned tube section, so that the finned tube material can be saved particularly effectively.
  • FIGS Figures 1a and 1b are identical fin heights of the different finned tube sections 16
  • the finned tube sections 16 show there Figure 1b an identical rib height h.
  • the fin slopes of the individual finned tube sections 16 differ, however.
  • FIG Fig. 4 a still connected
  • a first sector 22a has a particularly high rib slope
  • sector 22b has a medium rib slope
  • sector 22c has a low rib slope.
  • the sector 22d then has no ribs at all.
  • the ribs in this exemplary embodiment generally have an identical height h and are typically provided by more than one band. In this exemplary embodiment, the length of the sectors is 1/4.
  • the invention also includes heat exchangers whose rib tube sections (at least partially) have different materials: Since this cannot or can hardly be represented graphically, a corresponding Figure omitted. It is only indicated that, for example, in the Fig. 1a and 1b or 3 finned tube sections 16 shown could have different materials: For example, in Fig. 1a the rib material of the ribs 19a may be different from the rib material of the ribs 19b (but this also applies to the Figure 3 ).
  • the fins of an individual finned tube section (for example of the finned tube section 16a according to FIG Fig. 1a consist of several strips of different materials;
  • the ribs 19b of the finned tube section 16b could then only consist of one material, completely regardless of whether the finned tube sections 16 have the same fin pitch and / or height).
  • FIG. 5 is then intended to make it clear that the finned tube sections 16 are not as shown in FIG Fig. 1a (indicated there in particular above the housing 11) must run independently of one another. Rather, they can be assigned to a common pipe or be formed from sections of this pipe: So shows Fig. 5 that the finned tube sections 16 ′ are all integral components of an overall tube 23 which, in addition to the straight finned tube sections 16 ′, also has curved finned tube sections 24. Also such finned tube sections, or such an overall tube 23, can in principle be used in heat exchangers, the arrangement in a housing then of course being somewhat different from that according to FIG Fig. 1a deviates. Nevertheless, they are basically suitable for guiding the second fluid 18 in their interior.
  • FIG. 6 Another different exemplary embodiment of an overall pipe 23 ′ is then shown Fig. 6 :
  • the finned tube sections 16 belong as in Fig. 5 to a common overall pipe 23 '. In this case, however, they are not straight, or their main direction of extent is not aligned along a straight line, but rather curved in an arc-like manner. The reason for this is that the overall pipe 23 has an essentially helical configuration.
  • FIG. 9 is intended to make it clear that finned tube sections 16 arranged next to one another (for example finned tube sections 16i, 16ii and 16iii) can also have different ribs: Even if this cannot be seen in FIG.
  • the rib pitch and / or vary the height of the ribs are also intended to be encompassed by the invention.
  • the overall pipe 23 'could be ribbed in a manner similar to that in FIG Fig. 4 represented (i.e. gradually or continuously variable) and then converted or bent into its helical end shape. This is also intended to be encompassed by the invention.
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DE102016100192A1 (de) * 2016-01-06 2017-07-06 Hanon Systems Vorrichtung zur Wärmeübertragung

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