EP3825636B1 - 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
EP3825636B1
EP3825636B1 EP20208451.3A EP20208451A EP3825636B1 EP 3825636 B1 EP3825636 B1 EP 3825636B1 EP 20208451 A EP20208451 A EP 20208451A EP 3825636 B1 EP3825636 B1 EP 3825636B1
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EP
European Patent Office
Prior art keywords
finned tube
sections
pipe
ribs
heat exchanger
Prior art date
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Application number
EP20208451.3A
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German (de)
English (en)
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EP3825636A1 (fr
Inventor
Stefan Leutloff
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Schmoele GmbH
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Schmoele GmbH
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Publication of EP3825636A1 publication Critical patent/EP3825636A1/fr
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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 producing or designing a heat exchanger.
  • a heat exchanger is a device that transfers thermal energy from one material stream to another.
  • the substances are usually fluids, i.e. liquids or gases.
  • one of the substances is a liquid (e.g. water) and the other is a gas (usually air).
  • the component that separates the substances must have good thermal conductivity and, in particular, a large surface area.
  • the component is usually provided by pipe sections in which one of the substances, typically a liquid, is carried.
  • a typical heat exchanger has spiral finned tube sections that are bundled into compact heat exchangers.
  • Spiral finned tubes are thin-walled, metallic tubes that have spiral or helical ribs to increase the surface area.
  • the density of ribs is also called “rib pitch” and has a significant influence on the thermal properties.
  • finned tubes with a given pitch to form heat exchangers.
  • a (common) rib pitch can be selected for the pipe sections.
  • the fin height can also be adjusted for all finned tube sections.
  • Variances, especially regarding the pitch, are generally known in heat exchangers with regard to the ribs; for example, as shown by the US 2006/0008394 A1 , which discloses a heat exchanger with the features in the preamble of claim 1, or the US 2016/0376986 A1 , although these two publications come from the area of exhaust gas purification in (coal-powered) power plants, in which the fins of the finned tubes usually come from the Pipe to be rolled out.
  • the sections can, for example, have a different rib pitch.
  • 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 (particularly 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 particularly narrowly finned and/or provided with particularly high fins because it is particularly worthwhile for these pipe sections.
  • At least two of the pipe sections should have different ribs compared 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 based on information that is typically obtained or created in a previous process 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 relative to one another or among each other.
  • the flow direction of the fluid flowing outside the pipe sections can be taken into account.
  • the arrangement of the pipe sections is dictated by 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 heat exchange behavior or has a significant influence on it.
  • Corresponding information can be obtained by carrying out simulations (particularly computer-aided) or alternatively or additionally by carrying out tests (on real test setups).
  • the information obtained or created therefore relates to the heat exchange behavior of the pipe sections, whereby in particular pipe sections can be determined which, in the given or selected arrangement, enable or have better heat exchange behavior or better heat transfer between the two substances or fluids.
  • a computer program or an app can be used.
  • the specified pipe section positions can then be stored or entered in this program and based on assumptions about the flow direction of the external medium (i.e. the fluid that is located outside the pipe sections and is not currently being fed into them), knowledge can then be gained about the heat exchange behavior of the different finned pipe sections.
  • the simulation can initially be based on a predetermined rib height.
  • 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 about the simulated or calculated heat exchange behavior in the area of the finned tube sections, in particular regarding the heat flow (for example, values relating to the heat flow density can be displayed in adjusted colors).
  • 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 finned pipe sections are combined to form a heat exchanger or accommodated or installed in a heat exchanger housing or similar.
  • the method according to the invention is only used for the design of 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 passes on the data created about the design of the heat exchanger or the draft of the heat exchanger - internally or externally).
  • a heat exchanger according to the invention has at least two (differently) finned pipe sections.
  • the heat exchanger can also have more pipe sections than two (for example four, six, eight or even more pipe sections). At least 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 obtaining information, for example through a simulation, make sense.
  • 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 also makes it easier 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 are not connected to one another - at least within the heat exchanger housing.
  • the invention also includes tube sections which actually belong to the same finned tube: Even straight, parallel tube sections can, for example, be provided by a meandering overall finned tube: In this case, the individual finned tube sections are arranged straight and parallel to one another. But these are all part of the same overall finned tube. Of course, several such overall finned tubes can be provided in a heat exchanger.
  • a helical overall finned tube for example, 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 extension therefore extends along a straight line).
  • the pipe sections can in particular be arranged offset from one another or aligned with one another.
  • the base bodies of the pipe sections typically consist of copper (or another suitable metal, in particular stainless steel).
  • the ribs can then, for example, consist of the same material (including 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 provided by more than one band (in particular by two bands or more).
  • a finned tube section can be completed much more quickly at a given distance between two adjacent fins.
  • the bands can have a higher pitch for the same amount of time (for example, with two bands, twice as high as in the prior art method, in which only one band is arranged on the finned tube).
  • the bands that provide the ribs are typically welded to the tube bodies using (at least) a laser.
  • the pipe base 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 finning band is then attached to the pipe base body, usually using a laser, typically in a helical shape.
  • the ribs of the pipe sections are compared to one another have a different height.
  • at least one pipe section has a different rib height than another pipe section.
  • the rib height essentially corresponds to the width of the band that is used to create the ribs.
  • ribs of the pipe sections consist of a different material.
  • a first pipe section can be provided which has a rib made of a first material and a second pipe 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 that are only equipped with stainless (more expensive) fins 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 bands made of different materials, so that the ribs of this pipe section, for example, consist of a first and consist of a second material.
  • another pipe section which has ribs of only one of these materials (or another material) would therefore represent a pipe section with ribs made of a different or different material in the sense of the invention.
  • An embodiment 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 length (for example inches). The higher the pitch, the closer the ribs are together and the more rib material is used.
  • a higher pitch is used for the pipe sections, which, according to the information obtained or created (due to their arrangement), have better heat exchange behavior, since the use of the fin material is more worthwhile or more efficient here.
  • the pipe sections come from the same pipe. In particular, they were cut off from this primordial tube. This means that at least two pipe sections were still part of one pipe before a cutting process. After the separation process, for example after cutting or cutting through or similar, 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 come is already finned before a separation process occurs. This makes it easier to produce.
  • the tube is ribbed in varying ways, in particular varying gradually. This makes it particularly easy and economical to produce, since in this way pipe sections can come from or be separated from a pipe and have a different pitch to one another. The manufacturing process is kept very simple, as only one tube is actually used.
  • the original tube can in particular be designed to be straight or straight along its longitudinal extent.
  • the separated pipe sections then also have a straight shape along their longitudinal extent.
  • a (straight) pipe a few meters long can be ribbed in one piece in this way (preferably ribbed in varying degrees).
  • 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 take place which separates the first area from the second (and possibly the second from the third, etc.).
  • the pipe can be cut off. If the gradient varies gradually, it naturally makes sense for each pipe section to have a constant gradient, with the gradient of the pipe sections varying in comparison to one another.
  • Such a varying rib pitch of the Urrohr body can be achieved in particular in that one of the Variable band guide developed by the applicant is used, which can vary the angle of attack of the band or bands during the welding process.
  • the original tube 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 to fin a specific pipe section, for example because it does not have any significant heat exchange behavior or something similar. In this way, a particularly large amount of rib band material can be saved.
  • the ribs of at least one pipe section consist of at least two bands. Bands are typically welded to tube bases to produce ribs. The width of the band determines, for example, the height of the rib.
  • the ribs of a pipe section are provided by at least two bands, which are typically designed separately (that means in this case in particular that they run parallel to one another, preferably helically).
  • the ribs assigned to one side of the pipe section are always alternately provided by one of the bands.
  • This embodiment has the particular advantage that this facilitates a varying rib pitch for finning the original tube (from which the tube 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 much more reliable control of the rib fastening process, which ultimately also reliably enables varying rib pitches.
  • a finned original tube can be produced, which is then divided into several tube sections by a separation process, which can then in turn be installed in the heat exchanger, such that the individual tube sections actually have different slopes compared to one another.
  • the information on the heat exchange behavior of the pipe sections can be obtained through a computer-aided simulation.
  • a computer program can be used, for example a computer program that can be executed on a conventional PC, a notebook, tablet, cell phone or similar.
  • 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 meaningfully selected for the simulation, such as the type of flowing medium, the direction of flow, condensation effects and/or a predeterminable rib height.
  • such a simulation can be offered, embedded or executed as a tool or app or similar in a CAD program.
  • This has the advantage that the designer who operates the CAD program can directly use the information obtained via this simulation to define different ribs for different pipe sections and to specify, save or take them 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 to illustrate the calculated/expected heat exchange behavior of the pipe sections.
  • such a computer-aided program can be calibrated, adjusted or configured at the factory or by the user by taking real measurement data into account. So a measurement can take place in an actual wind tunnel or similar, and these real results can then be taken into account to adjust, correct or calibrate the computer-based simulation.
  • data such as pressure loss of the medium as it flows through the finned tube bundle (using an inclined tube manometer) and/or the amount of condensate (using a calibrated measuring vessel and stopwatch) and/or the vapor pressure (using a Urrohr manometer) and/or air can be collected - and outlet, steam and condensate temperatures (with thermocouples) are measured and then taken into account in a simulation.
  • the underlying object is achieved by a heat exchanger according to claim 1, which therefore has the special feature that the finned tube sections are finned differently, the ribs of a finned tube section being formed by a finned band which is attached to the tube base body in a helical shape, and the heat exchanger having two or more rows of finned tube sections.
  • the heat exchanger has finned tube sections which are provided with different fins.
  • the rib height can differ and/or the pitch of the ribs and/or the material of the ribs.
  • 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 material conducted within the finned tubes.
  • heat exchangers are also intended to be disclosed in which the pipe sections have a different pitch and/or a different height and/or a different material compared to one another.
  • the pipe sections can belong to the same pipe or come from the same pipe. Regardless of this, they can be designed separately - at least within the housing. For example, they can be merged outside the case (or inside) for one common connection or drain or similar. This list should be understood as explicit but not exhaustive.
  • Fig. 1a first shows a very schematic side view of a first exemplary 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.
  • Two finned tube sections 16a and 16b are shown as an example, which in this exemplary embodiment are straight and arranged parallel to one another.
  • the main extension direction E or the longitudinal extension of the finned tube sections 16, is aligned transversely or orthogonally to the main flow direction H of the first fluid 14.
  • the finned tube sections 16 pass through the interior of the housing 11 transversely to the main flow direction H.
  • the finned tube sections 16 are aligned with outputs 17 of the housing 11.
  • Seals 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 The dashed line outside the housing 11 deliberately leaves open whether the channels formed by the finned tube sections 16a and 16b are brought together outside the housing 1a (as with regard to Fig. 1a indicated below the housing 11) or whether these are continued separately (as with regard 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 be, for example, a liquid such as water or the like.
  • the heat exchanger 10 enables heat transfer between the first fluid 14 within the housing 11 (but outside the finned tube sections 16) and the second fluid 18 within the finned tube sections 16.
  • the two finned tube sections 16 in particular to increase the Surface of the pipe section) ribs 19.
  • These ribs 19 are provided by bands running helically around the respective pipe section, which bands are typically welded to the pipe section base body (in particular using lasers).
  • the ribs 19, or bands can typically be made of copper or stainless steel or another suitable material.
  • the basic tube bodies of the finned tube sections 16 usually consist of stainless steel or copper or another 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 pitch essentially describes the density of the ribs, i.e. the number of ribs per unit length (for example per inch or per centimeter or similar).
  • the finned tube section 16a has a higher fin pitch than the finned tube section 16b. This has to do in particular with the fact that the finned tube section 16a is located 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 on the ribs 19a of the first finned tube section 16a tends to be greater than on the ribs 19b of the second finned tube section 16b.
  • the heat transfer takes place between the first fluid 14 and the second fluid 18, in the exemplary embodiment according to Fig. 1a
  • 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 allocating 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 should 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 by only a single band. But there is also that Possibility that the ribs 19a and / or 19b are each formed by several bands, which then typically run parallel in a helical manner.
  • Fig. 1b shows a very schematic, sectional top view of the device 10 Fig. 1a , approximately along the view arrows lb in Fig. 1a.
  • Fig. 1b clearly shows that the finned tube bundle 15 consists not only of a pair of finned tube sections 16a and 16b, but typically of a larger plurality, in the case shown, namely of four exemplary finned tube sections 16a to 16d (but in practice they are actually for a finned tube bundle 15 significantly more finned tube sections are provided).
  • FIG. 1b The configuration or arrangement of finned tube sections 16 visible for the finned tube bundle 15 represents only an example of an offset arrangement of the tubes.
  • an aligned tube arrangement can of course also be provided or an aligned offset tube arrangement.
  • two rows of finned tube sections are provided.
  • finned tube bundles 15 actually have more rows, in particular with more tube sections than two in a row.
  • the configuration is as per Figs. 1a and 1b can only be understood as an example.
  • Fig. 1a can also be Fig. 1b see 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 - as well Fig. 1a executed - in the rib pitch, which is shown in the top view Fig. 1b is indistinguishable. But it is in this regard 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 pitches based on information that the user himself has created based on considerations and assumptions (finned tube sections in an arrangement closer to the inlet 12 provide a more effective heat exchange).
  • 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 finning to be selected for a finned tube section: So shows Fig. 2 a schematic representation of the result of a computer-aided simulation of the heat flux density along the fins 19 of finned tube sections 16, in a configuration approximately according to Fig. 1b .
  • the result of the computer-aided simulation clearly shows Fig. 2 a broken window area, for example in the manner of a flow channel, with a main flow direction H being specified for the first fluid 14.
  • tube and fin materials e.g. copper
  • surface quality of tube and/or ribs for example smooth
  • the temperature coupling between a finned tube and the air knowledge can be gained about the flow behavior outside the tubes within the framework of a simulation. This includes in particular the pressure loss but also the heat transfer and/or the temperatures in the heat exchanger in general.
  • Fig. 2 shows an example of the distribution of the heat flow density on the fins 19 of the four exemplary finned tube sections 16 when specifying specific parameters that are not mentioned in more detail here.
  • the legend which is also shown, illustrates the hatching as heat density increases, although in practice a display uses color coding instead of hatching.
  • ribs 19a and 19c of the finned tube sections 16a and 16c have much higher heat flux densities and are therefore more effective in heat transfer between the two fluids (inside and outside the finned tube sections) than the ribs 19b and 19d of the finned tube sections 16b and 16d.
  • Fig. 3 shows a very schematic supervision, which roughly corresponds to the supervision
  • Fig. 1b corresponds to a second embodiment 10 ⁇ of a heat exchanger according to the invention.
  • the finned tube sections 16 are according to Fig. 3 in their position identical to those according to Fig. 1b arranged in a housing 11.
  • the finned tube sections 16 - which can be clearly seen when viewed from above - now have different fin heights h:
  • the finned tube section 16a shows according to the simulation result Fig.
  • this finned tube section 16a has now been assigned a particularly large fin height h 1 , which is, for example, much larger 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 does not participate particularly effectively in heat transfer anyway.
  • Fig. 2 Participates particularly little in the heat transfer, or does not have particularly good heat transfer properties due to its arrangement, is shown in the exemplary embodiment Fig. 3
  • finning is completely dispensed with, so that the finned tube material can be saved particularly effectively.
  • a first sector 22a has a particularly high rib pitch
  • sector 22b has a medium rib pitch
  • sector 22c has a low rib pitch.
  • the sector 22d then has no ribs at all.
  • the ribs in this embodiment typically have an identical height h and are typically provided by more than one band.
  • the length of the sectors is I/4.
  • the sectoring and finning of the original tube 21 according to Fig. 4 is to be understood only as an example and in particular the sector 22d without any ribbing certainly represents a special case (which corresponds to the exemplary embodiment Fig. 1b cannot be transferred directly, since all finned tube sections 16 are finned).
  • the heat exchanger 10 is not exactly made from the original tube 21 Figs. 1a and 1b made, but a heat exchanger, not shown, with an identical finned tube section arrangement but with Fig. 1b different ribbing (particularly different rib pitch).
  • the invention also includes heat exchangers whose finned tube sections have (at least partially) different materials: Since this cannot or can hardly be represented graphically, a corresponding one is used Figure omitted. It is only suggested that, for example, the ones in the Figs. 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 than the rib material of the ribs 19b (but this also applies to the Figure 3 ).
  • the ribs of a single finned tube section (for example the finned tube section 16a according to Fig. 1a consist of several bands of different materials;
  • the ribs 19b of the finned tube section 16b could then only consist of one material, completely independent of whether the finned tube sections 16 have the same rib pitch and/or height).
  • Fig. 5 should then make it clear that the finned tube sections 16 are not as in 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 can be formed by sections of this pipe: This shows Fig. 5 that the finned tube sections 16' are all cohesive components of an overall tube 23, which, in addition to the straight finned tube sections 16', also has arcuate finned tube sections 24. Such finned tube sections, or such an entire tube 23, can in principle be used in heat exchangers, with the arrangement in a housing then of course being somewhat different from that according to Fig. 1a differs. Nevertheless, they are fundamentally suitable for guiding the second fluid 18 inside them.
  • FIG. 6 A further different exemplary embodiment of an entire tube 23 'then shows Fig. 6 :
  • the finned tube sections 16 belong as in Fig. 5 to a common overall tube 23 ⁇ . However, in this case they are not straight, or are not aligned along a straight line in their main direction of extension, but are curved like an arc. This is due to the fact that the overall tube 23 has a substantially helical configuration.
  • 9 is intended to make it clear that finned tube sections 16 arranged next to one another in this way (for example finned tube sections 16i, 16ii and 16iii) can also have different finning: Even if this is not visible in FIG. 9 for the sake of clarity, the rib pitch and / or or the rib height can vary.
  • the entire tube 23 'could be ribbed similarly, as in Fig. 4 represented (i.e. gradually or continuously variable) and then converted or bent into its helical final shape. This should also be covered by the invention.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Claims (1)

  1. Echangeur de chaleur (10) avec plusieurs sections de tubes à ailettes (16) disposées parallèlement les unes à côté des autres, dans lequel les ailettes (16) d'une section de tubes à ailettes (16) sont constituées par une bande d'ailettage qui est montée en forme de spirale sur le corps de base tubulaire, lequel échangeur de chaleur (10) présente deux ou plusieurs rangées de sections de tubes à ailettes (16), caractérisé en ce que les sections de tubes à ailettes (16) sont ailettées différemment.
EP20208451.3A 2019-11-20 2020-11-18 Échangeur de chaleur et son procédé de fabrication ou de conception Active EP3825636B1 (fr)

Applications Claiming Priority (1)

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DE102019131323.6A DE102019131323A1 (de) 2019-11-20 2019-11-20 Wärmetauscher und Verfahren zu dessen Herstellung beziehungsweise Entwurf

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EP3825636B1 true EP3825636B1 (fr) 2024-01-24

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Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE475338C (de) * 1929-04-22 Walter Koenig Verfahren zur Befestigung von Thermoelementen auf einem Heizrohr aus keramischem oder sonstigem Material
US2868515A (en) * 1955-11-25 1959-01-13 Carrler Corp Heat exchanger construction
US3138201A (en) * 1960-03-30 1964-06-23 Huet Andre Heat exchanger with grooved tubes
JPS57187589A (en) * 1981-05-12 1982-11-18 Babu Hitachi Eng Service Kk Heat recovering apparatus
JPH0610593B2 (ja) * 1984-02-14 1994-02-09 住友金属工業株式会社 スパイラルフィン付き伝熱管の製造方法
KR101036979B1 (ko) * 2002-11-05 2011-05-25 바브콕-히다찌 가부시끼가이샤 배기가스 처리장치
JP5023911B2 (ja) * 2007-09-19 2012-09-12 パナソニック株式会社 スパイラルフィンチューブ型熱交換器
DE102011118164C5 (de) * 2010-12-29 2018-08-30 Thesys Gmbh Wärmeübertrager und Verfahren zum Betreiben eines Wärmeübertragers
US20140284038A1 (en) * 2013-03-21 2014-09-25 Hamilton Sundstrand Corporation Heat exchanger design and fabrication
US20160376986A1 (en) * 2015-06-25 2016-12-29 Hrst, Inc. Dual Purpose Heat Transfer Surface Device
DE102016100192B4 (de) * 2016-01-06 2021-10-21 Hanon Systems Vorrichtung zur Wärmeübertragung

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