EP3572760A1 - Package for heat and/or material transfer - Google Patents

Abstract

The invention relates to a packing for a heat and / or mass transfer between liquid and gaseous media in countercurrent, in particular for the water cooling by air in cooling towers, with a plurality of by corrugations (22) profiled foil elements (21), wherein the corrugations (22 Providing flow channels (25) and wherein the film elements (21) are arranged one behind the other, forming contact points (29) in the thickness direction (40), wherein adjacent film elements (21) are interconnected in their contact points (29) and wherein the facing large surfaces (30) of adjacent film elements (21) have a fine profile (31), characterized in that the fine profile (31) has a transversely to the flow channels (25) extending ribbing (32) with rib webs (33) and rib grooves (34), wherein between two adjacent rib webs (33) a rib groove (34) is arranged, wherein the transitions between aufei Nenden subsequent rib webs (33) and rib grooves (34) are formed substantially free of radii.

Description

The invention relates to a packing for a heat and / or mass transfer between liquid and gaseous media in countercurrent, in particular for the water cooling by air in cooling towers, with a plurality of profiled by corrugations foil elements, wherein the corrugations provide flow channels and wherein the film elements under training of contact points in the thickness direction are arranged one behind the other, wherein adjacent film elements are connected to each other in their points of contact and wherein the mutually facing large areas of adjacent film elements have a fine profile.

Cooling towers for water cooling in general as well as cooling installations for cooling towers - also called packs - in particular are well known from the prior art per se.

Cooling towers serve, in particular, to cool liquid media, that is fluids such as water, by means of ambient air. For this purpose, previously known cooling towers have a fluid cooling device, which in turn has cooling installations, that is to say so-called packings, and a fluid distribution device. The fluid to be cooled is sprayed above the packs by means of the Fluidverteileinrichtung and trickles along the packs, namely the gravity down. In this case, the packs are preferably flowed through in countercurrent to the fluid to be cooled by air for the purpose of cooling. As a result of the contact of the fluid to be cooled with the air within the packs, the cooling of the fluid to be cooled occurs as intended.

In order to guide the serving as cooling air ambient air in the manner explained by the cooling tower, a fan is provided which promotes the flow of air through the cooling tower and in particular by the cooling installations. This is typically arranged in the height direction of the cooling tower above the fluid cooling device. During normal operation, the fan sucks from below the fluid cooling device ambient air, which flows as cooling air arranged in the height direction of the cooling tower below the fan fluid cooling device. The ambient air sucked in by the fan is released to the atmosphere as heated ambient air after passing through the packs upwards.

A cooling tower of the type described above, for example, from WO 20091149954 A1 known.

In order to achieve the most effective heat exchange between the participating media, a packing construction is known from the prior art, according to which a plurality of profiled by corrugations foil or plate elements is provided. These film elements are arranged one behind the other in the thickness direction, the corrugations providing flow channels. At their points of contact adjacent foil elements are interconnected. Furthermore, the mutually facing large areas of adjacent foil elements have a fine profile. This fine profiling serves a further optimized heat exchange.

A generic pack is from the DE 41 22 369 C1 known.

Furthermore, from the DE 27 22 424 A1 a built-in element for mass and heat exchange columns known. The installation element consists of parallel, arranged to the column axis, touching, folded slats of foil-like material. The folds of the slats lie at an angle to the column axis. The folding walls of the lamellae are additionally fine-edged and the lamellae have a plurality of holes distributed over their surface. In this case, the corrugation results from a roughening of the slat surface by grooves or impressing patterns.

From the DE 27 22 556 A1 is a packing of sheet-like material with trickling surfaces for columns for mass and heat exchange known. It is provided that the trickling surfaces alternately smooth and finely chamfered sections, with the individual sections extend over a height of at least 5 mm.

The DE 39 18 483 A1 relates to a packing for the heat and mass transfer in countercurrent. The packing has a plurality of vertically and slanted, superimposed and interconnected corrugated or folded sheets or plates which are formed and / or stacked and interconnected to intersect the corrugations or folds of adjacent sheets or plates. The corrugations or folds of adjacent films or plates intersect only in upper part of the packing, while in the lower part parallel to each other.

The US 6,578,829 B2 relates to a packaging section having a plurality of vertically oriented, diagonally cross-shaped corrugated packaging sheets. The packaging sheets define a section height, the section having a base region, a volume region, and an upper region. The base region has a first specific geometry that differs from a geometry of the volume region. The upper area also has a certain second geometry, which also differs from the geometry of the volume area, as well as the geometry of the base area.

The EP 0 056 911 B1 relates to a filling part for filling purposes in a water cooling tower, which has in the ground state upright sheets of moldable material everywhere with a generally zigzag-shaped, downwardly facing spiral pattern. Each plate has a pair of opposite sides intended for wetting by heated and downwardly flowing water. Here, the malleable material is equipped with horizontal ribs that form angled depressions. In addition, it is provided that the filling part has water cooling pockets at the sinusoidal bend between each rib and that the pockets of the depressions are arranged at an angle with respect to the horizontal.

The EP 1 078 684 A1 discloses an ordered packing for separation columns having profiled layers and channels disposed therein. The channels are oriented obliquely to a main flow direction. The layers are formed from foil-like and tissue-shaped strips of material into a profile.

Although the from the DE 41 22 369 C1 previously known construction of a pack for the heat and mass transfer between liquid and gaseous media has proven in everyday practice, there is room for improvement. So it is particularly desirable to increase the efficiency even further. And this preferably without significant additional costs for the production. It is therefore an object of the invention to further develop a generic package to the effect that in the normal operating conditions improved heat and mass transfer between the participating media is achieved.

To solve this problem, the invention proposes a packing of the type mentioned, which is characterized in that the fine profile has a transverse to the flow channels ribbing with rib webs and rib grooves, wherein between two adjacent rib webs a rib groove is arranged, wherein the transitions are formed substantially free of radii between successive rib webs and rib grooves.

The formed on the large surfaces of the film elements fine profiling is formed according to the invention as ribbing. The ribbing extends transversely to the flow channels of the film elements. For example, a ribbing may be provided which runs parallel to the input or output side marginal edges of the film elements.

The ribbing according to the invention has rib webs on the one hand and rib grooves on the other hand, wherein a ribbed groove is arranged between two adjacent rib webs. It thus results in an alternating arrangement of rib webs and rib grooves in the longitudinal direction of the film elements.

The transitions between rib webs and rib grooves following one another in the longitudinal direction of the film elements or in the transverse direction of the ribbing are formed substantially free of radii according to the invention. In this case, "substantially" means an embodiment without transition radii, insofar as this is possible in terms of production technology. It therefore depends on the invention to avoid transition radii between the successive rib webs and rib grooves, so that the result is a "sharp-edged" configuration.

Investigations by the applicant have shown that, as a result of the radii-free design of the transitions between successive rib webs and rib grooves, improved efficiency is achieved. This improved efficiency can be explained by the fact that forms a fluid film in the operating case on the vertically oriented large surfaces of the film elements, which flows along the large surfaces following the gravitational force. Due to the sharp-edged configuration of the rib webs and grooves, the ribbing of the fine profiling running transversely thereto ensures that it comes in each case in the areas of the transitions between successive rib webs and rib grooves to turbulent flow conditions. These turbulent flow conditions ensure better heat and mass transfer between the fluid to be cooled, for example water, and the gaseous medium, for example the ambient air, which is passed through the packing in countercurrent thereto. As a result, a further optimized mode of action of the pack according to the invention can be achieved.

The deliberate design of transition radii between rib webs and rib grooves is therefore provided according to the prior art in order to be able to better remove the foil elements formed mostly from a plastic material from a mold. It was not recognized that transition radii minimize the barrier effect of the fine profiling, which has a positive effect on the efficiency of a packing, and thus promote the formation of a laminar flow. The Scharfkantigkeit of both the rib webs and the rib grooves provided according to the invention now in departure from the prior art provides a remedy, since turbulent flow conditions form due to this structural design in the operating case, which causes an improved mixing of the two media involved, which in the result leads to an increased heat exchange. A disadvantage of the provided according to the invention sharp-edged design of the transitions between rib webs and rib grooves, however, is that the gas-side, i. Air-side pressure loss increased. This results in an increased energy expenditure for the fan to promote the cooling air flowing through the pack. However, this disadvantage is deliberately accepted. Because in total, an overall increased overall efficiency is achieved with the construction according to the invention. This has significant advantages for the operation of corresponding equipment in various industries in the form of smaller and thus cheaper systems and overall lower total cost of ownership.

According to a further feature of the invention, it is provided that the corrugations provide inclined flow channels in the longitudinal direction of the film elements, preferably zig-zag flow channels, wherein the film elements are arranged alternately in the thickness direction, so that the flow channels of adjacent film elements extend with opposite inclination and get under

Crossing the training of touchpoints.

According to this embodiment of the invention, the flow channels are not rectilinear in the longitudinal direction of the film elements, but aligned inclined thereto. In this case, a zigzag-shaped configuration is preferred. The inclination of the flow channels to the vertical provides the positive effect that results in an extended with respect to the vertical extent of the package according to the invention flow path, which provides improved heat exchange.

As a reference for the design of the transition radii can serve the width of a rib web, in particular the width of a rib web top side final plateau. It is therefore proposed according to a further feature of the invention that the transition radii <20%, preferably <10%, more preferably <5% of the rib web plate width of the associated rib web are formed. If, for example, the rib web plate width measures 5 mm, the result is a transition radius of preferably <0.5 mm, more preferably of <0.25 mm.

The smaller the transition radii are selected, the slower the demolding rate during the removal of a film element from the mold during manufacture can be eliminated. This disadvantage is deliberately accepted with the embodiment according to the invention, since the subsequent efficiency of the thus formed film element is significantly improved over the prior art. For technical reasons, a transition radius of zero will not be reached. "Essentially" in the sense of the invention therefore means that the transition radii are to be designed as small as possible in the context of the application of conventional manufacturing processes. Because the more "sharp-edged" the rib design fails, the more clearly the effect of a turbulent flow in normal operating conditions sets in.

It is provided according to a further feature of the invention that a rib groove has a groove depth of 2.0 mm to 3.0 mm, preferably 2.2 mm to 2.8 mm, more preferably 2.4 mm to 2.6 mm, most preferably 2.5 mm. As investigations by the Applicant have shown, a groove depth in the specified range achieves an optimized efficiency. If the groove depth falls significantly smaller or clear larger, so set in the normal operation case flow effects on the rib webs and / or the rib grooves, which preclude an effective heat and / or mass transfer between the media involved. In addition, in this connection, if the groove depth is too large, the pressure loss within the air sucked through the pack by the fan increases significantly, which has to be compensated by a higher fan power, which has a negative effect on the overall energy consideration. It is insofar achieved with a groove depth in the size range according to the invention a synergistic effect to the effect that on the one hand required for improved heat and / or mass transfer turbulent flow is achieved and that on the other hand, the adjusting itself as a result of flowing through the pack with ambient air pressure loss is minimized.

It is provided according to a further feature of the invention that a rib groove has a groove width of 4.0 mm to 6.0 mm, preferably of 5.0 mm. However, particularly preferred is a ratio of groove depth to groove width of 0.6 to 0.4, preferably of 0.5. So if the groove depth, for example, 2.5 mm, so the groove width is to be selected with 5 mm.

It is therefore also preferred for the aforementioned reasons, as far as possible to equip the large surfaces of the film elements facing each other with a fine profile in the sense of the invention. It is preferable to omit only some areas of the large surfaces of the film elements, such as the input and output side end portions of the film elements.

To further reduce the self-adjusting air-side pressure loss can be provided according to a further feature of the invention that the inclination of the flow channels to the vertical in the final assembled state <22 °, preferably between 19 ° and 15 °, more preferably 17 °. The inclination of the flow channels to the vertical provides the positive effect of extending the total flow path to be covered, which also provides improved heat and / or mass transfer. However, the greater the inclination to the vertical, the greater the pressure drop occurring in the air flow during operation. This leads in already described manner to an inevitably necessary increase in the fan power, which has a negative effect on the overall energy balance. To minimize the power, it is basically desirable, the flow channels in parallel Run longitudinally, but then again leads to a deterioration in heat and / or mass transfer due to the shortened flow path. To bring these conflicting interests in an optimized balance to each other, allows the fine profiling according to the invention. Because of this, an increased heat and / or mass transfer is possible, so that it is possible to minimize the pressure loss in the cooling air, the inclination angle of the flow channels to the vertical form smaller than usual, namely less than 20 °. This was not to be expected against the background of the prior art.

As a groove depth within the meaning of the invention preferably applies over the groove width averaged groove depth. Alternatively, the groove depth with respect to the groove width in the middle of the groove can serve as a reference.

It is provided according to a further feature of the invention that the longitudinally opposite end regions of a film element are formed without fine profiling.

It is particularly preferred in terms of the intended use case liquid input side provided edge or end portion of the pack to form this fine profiling free. This is why, so that an optimized distribution of the liquid delivered by the liquid distribution device arranged above the packing can take place on the individual flow passages of the pack. It is thus achieved a uniform fluid loading of all flow channels. Such a uniform liquid distribution can still be supported by the provision of appropriate nozzles of the liquid distribution.

According to a further feature of the invention, it is provided that grooves are formed in the fine profiling-free end regions of the film elements obliquely to the longitudinal extension of the film elements. These grooves are preferably formed on the liquid inlet side and liquid outlet side of the pack in the film elements. They serve in particular to flow out the liquid from the pack after a flow through the same in an improved manner and allowed to drain. As a result of this measure, a reduced gas or air side pressure loss is achieved. It is special in this context preferred that per flow channel two grooves are provided, which are aligned in a V-shape to each other. The liquid film forming in the intended use case on the inner side walls of the flow channels can thus flow better on the output side without the formation of accumulating fluid waves which would oppose the opposing air with increased resistance, as is the case in the prior art. This improved Abströmbeziehungsweise dripping effect can also be supported by the fact that the two grooves open into a common outlet, which is aligned in the direction of the longitudinal extent of the film elements. This results in the output side of the flow channels Δ-like structures, which provides an improved outflow of the discontinued on the package liquid.

It is provided according to a further feature of the invention that the mutually facing flow channels of adjacent foil elements form a foil or plate pair channel, which has on the input and output side in each case a hexagonal channel cross-section.

The mutually facing flow channels of adjacent film elements form in the final assembled state of the film elements from a pair of film pairs. In that regard, each film element provides a flow channel open on one side. In the final assembled state of the package, these flow channels of the individual film elements cooperate with respective formation of a pair of film pairs. On the input and output side, the film pair channels preferably have a channel cross-section which is polygonal, preferably hexagonal. The pitch, that is, the height of each flow channel in the forming depth of the sheet member is preferably 12 mm, 20 mm or 30 mm. This results in the input or output side of the package, a channel width for a pair of film channels of 24 mm, 40 mm or 60 mm, based on the film spacing or film pitch. Since adjacent film elements lie at their points of contact and are preferably connected to one another, initially wide channels of 24 mm, 40 mm or 60 mm are formed on the input side or output side, which channels then later on due to the inclined oblique arrangement on the opposite channels of the adjacent Make secondary foil so that a channel width of 12 mm, 20 mm or 30 mm is established at the narrowest points of the channels. This value essentially determines the Cost of materials and is crucial for the behavior of the package according to the invention in the intended use case. Because the smaller the distance, the denser the packing becomes. However, the higher the power density of the package due to this measure, the more it becomes soiled during long-term operation, ie the so-called fouling behavior worsens. In this respect, a careful selection and specification of these parameters, taking into account the operating conditions prevailing at the operating site, is required.

The corrugations of the film elements have on the input side or on the output side a polygonal channel cross section, preferably a hexagonal cross section, whose edge lengths are preferably of different lengths. It is preferred in this connection that the corrugations of the film elements have a first strip section extending in the longitudinal direction of the film elements and a second and a third longitudinal strip arranged along its respective longitudinal edges, the second and third strip sections being inclined relative to the first strip section. In this case, the second and the third strip portion are formed the same width and each have a width that exceeds the width of the first strip portion. Thus, the smaller the short edge length, i. E. The smaller the width of the first strip section, the more the preferably hexagonal-shaped channel cross-section of a film pair channel approaches a 4-corner-shaped configuration. Applicant's research has shown that the preferred ratio of short to long 6-corner page length, i. the width ratio of the first strip section and the second strip section or third strip section is between 0.3 and 0.4, preferably 0.35. It turns out to be a favorable for an optimized heat and mass transfer, i. as uniform as possible thickness of the liquid film forming on the surfaces of the flow channels.

The width of the first strip section or the short edge length of the channel cross section is division-dependent, but is at least 5 mm. For example, in a 20-division, the edge length is between 8 mm to 12 mm, preferably 10 mm. If the short edge length, ie the width of the first strip section, is significantly below these value parameters, a comparatively narrow liquid channel is created, which in the case of operation leads to a collection of liquid in the latter Channel can lead and what the overall efficiency of the package of the invention reduces.

Further investigations by the Applicant have shown that the measures according to the invention can provide an increase in the efficiency of the pack over the previously known designs of up to 8%, optionally 10%. Furthermore, it has been found that with the package according to the invention considerable savings in terms of installation height and resulting installation volume over known designs can be achieved. These amount to depending on the design of the cooling tower between 20% and 30%, which leads to significant cost reductions in the construction of cooling towers or their re-equipment with packages of the invention.

Fig. 1

in schematischer Seitenansicht ein Kühlturm nach dem Stand der Technik;

Fig. 2

in schematischer Seitenansicht ein Folienelement einer erfindungsgemäßen Packung gemäß einer ersten Ausführungsform;

Fig. 3

in geschnittener Ansicht das Folienelement nach Fig. 2 gemäß Schnittlinie B-B nach Fig. 2;

Fig. 4

in einer stirnseitigen Ansicht das Folienelement nach Fig. 2;

Fig. 5

in einer Schnittdarstellung das Folienelement nach Fig. 2 gemäß Schnittlinie A-A nach Fig. 2;

Fig. 6

in schematisch perspektivischer Darstellung ausschnittsweise den austrittsseitigen Endabschnitt des Folienelementes nach Fig. 2;

Fig. 7

in einer schematischen Perspektivansicht den ausgangsseitigen Endabschnitt nach Fig. 6;

Fig. 8

in schematischer Ansicht eine erfindungsgemäße Packung;

Fig. 9

in einer Stirnansicht die Packung nach Fig. 8;

Fig. 10

in schematischer Schnittdarstellung die Packung nach Fig. 8 gemäß Schnittlinie A-A nach Fig. 8;

Fig. 11

in schematisch perspektivischer Darstellung die erfindungsgemäße Packung nach Fig. 8;

Fig. 12

in schematischer Ansicht ein Folienelement einer erfindungsgemäßen Packung gemäß einer zweiten Ausführungsform und

Fig. 13

in schematischer Schnittdarstellung das Folienelement nach Fig. 12 gemäß Schnittlinie A-A nach Fig. 12.

Further features and advantages of the invention will become apparent from the following description with reference to FIGS. These show

Fig. 1

a schematic side view of a cooling tower according to the prior art;

Fig. 2

a schematic side view of a film element of a package according to the invention according to a first embodiment;

Fig. 3

in a sectional view of the film element after Fig. 2 according to section line BB Fig. 2 ;

Fig. 4

in a frontal view of the film element after Fig. 2 ;

Fig. 5

in a sectional view of the film element after Fig. 2 according to section line AA Fig. 2 ;

Fig. 6

In a schematic perspective view of the outlet side end portion of the film element according to detail Fig. 2 ;

Fig. 7

in a schematic perspective view of the output-side end portion Fig. 6 ;

Fig. 8

a schematic view of a package according to the invention;

Fig. 9

in an end view the pack after Fig. 8 ;

Fig. 10

in a schematic sectional view of the pack after Fig. 8 according to section line AA Fig. 8 ;

Fig. 11

in a schematic perspective view of the package according to the invention Fig. 8 ;

Fig. 12

in a schematic view of a film element of a package according to the invention according to a second embodiment and

Fig. 13

in a schematic sectional view of the film element after Fig. 12 according to section line AA Fig. 12 ,

Fig. 1 shows a cooling tower 1, as it is known from the prior art for example according to WO 2009/149954 A1 is known.

The cooling tower 1 has a liquid cooling device, which in turn has a Flüssigkeitsverteileinrichtung 14 on the one hand and cooling internals 12 on the other. In this case, the liquid distribution device 14 is arranged in the height direction 13 above the cooling internals 12.

The liquid distribution device 14 has a plurality of distribution pipes 15, which are connected to the liquid side of a common inlet pipe 5. The distributor pipes 15 of the liquid distribution device 14 are equipped with nozzles 16 on the cooling installation side, which in the event of operation distribute the liquid, for example water, introduced to the liquid distribution device 14 in the direction of the arrows 17 onto the cooling elements 12.

By the cooling tower 1 is ambient air in accordance with the arrows 18 and 19 with respect to the drawing plane in the normal operation case by means of a suction fan wheel 8 arranged as a cooling medium Fig. 1 guided from bottom to top. In the course of passing the ambient air through the cooling tower 1 therethrough The air passes through the cooling units 12, which are formed in three layers in the embodiment shown.

The liquid to be cooled by means of the cooling tower 1, for example water, is introduced into the liquid distribution device 14 via the inlet pipe 5. Here it arrives at the distribution pipes 15, which are equipped for the purpose of liquid discharge with preferably tangentially set full cone nozzles 16. The distance between the outlet openings of the nozzles 16 and the upper edge of the cooling fixtures 12 determines the spray height, which is for example 600 mm.

The evenly distributed over the cooling elements 12 by means of the liquid distribution device 14 trickles through the cooling water installations 12 in countercurrent to the bottom-up promoted cooling air.

The cooled after a trickling of the cooling elements 12 water drips from the cooling fixtures 12 and is collected in the water collection tray 3.

As can be seen from the presentation Fig. 1 Furthermore, 3 supporting struts 6 are provided for supporting the liquid cooling device relative to the water collection tray, which carry the liquid cooling device, ie the liquid distribution device 14 and the cooling elements 12.

In the height direction 13 above the liquid cooling device, a cooling tower jacket 2 is provided, which accommodates the fan wheel 8. The fan wheel 8 is part of an axial fan 7, which further comprises a gear assembly 9, a motor 10 and a motor 11 with the gear assembly 9 coupling shaft 11. In this case, the gear assembly 9 together with the fan wheel 8 is supported by a column 4 projecting through the liquid cooling device.

The cooling installations 12 provided in the height direction 13 below the liquid distribution device 14 include packings of the type according to the invention whose structure is made up of the others FIGS. 2 to 13 results.

A package 20 according to the invention (cf. Fig. 8 and Fig. 11 ) for a heat and / or Substance transfer between liquid and gaseous media in countercurrent, in particular for the water cooling by air in a cooling tower 1 after Fig. 1 , has a multiplicity of foil elements 21 profiled by corrugations 22. Such a foil element 21 is according to a first embodiment in FIG Fig. 2 shown in a side view.

The corrugations 22 of the film element 21 provide flow channels 25, as can be seen in particular from the sectional view Fig. 3 lets recognize. As can be seen from this illustration, the corrugation 22 of the film element 21 is composed of successive wave crests 23 and wave troughs 24, wherein a wave trough 24 or between two troughs 24 a wave crest 23 is arranged between two wave crests. With reference to the drawing plane Fig. 3 the corrugation 22 provides flow channels 25 both on the upper side and on the underside of the film element 21.

The flow channels 25 extend, as is the view Fig. 2 can recognize, in the longitudinal direction 26 of the film element 21, ie in the intended installation in the vertical direction from top to bottom or from bottom to top.

The preferred embodiment of the invention according to FIGS. 1 to 7 shows a film element 21, according to which the corrugations 22 in the longitudinal direction 26 inclined flow channels 25 provide, namely zigzag-shaped flow channels 25. This results in particular from the illustration Fig. 2 , The film elements 21 provided for forming a package 20 according to the invention are arranged alternately in the thickness direction 40 - also called the depth direction - as can be seen from the illustration according to FIG Fig. 8 results so that the flow channels 25 of adjacent film elements 21 extend with opposite inclination and intersect to form contact points 29 with each other. In the contact points 29 adjacent foil elements 21 are connected to each other, for example by gluing and / or welding.

The film elements 21 have on their large surfaces 30 according to Fig. 5 each have a fine profile 31. This fine profiling 31, also called microwell or microstructure, has a rib 32 extending transversely to the flow channels 25 Rib webs 33 and rib grooves 34, as can be seen in particular from the side view Fig. 4 and the sectional view to Fig. 5 results.

As this particular sectional view after Fig. 5 can be seen, a rib groove 34 is disposed between two adjacent rib webs 33 of the rib 32. In this case, according to the invention, the transitions between successive rib webs 33 and rib grooves 34 are substantially free of radii. It is insofar given a sharp transition between the rib webs 33 and the rib grooves 34.

"Essentially" formed radii-free in the context of the invention means a design without transition radii, if this is in particular production technology possible. It is therefore important to avoid transition radii between the successive rib webs 33 and rib grooves 34, so that the result is a "sharp-edged" configuration. "Substantially" in the sense of the invention means in particular that the transition radii are to be designed as small as possible in the context of the application of conventional manufacturing processes. Because the more "sharp-edged" the rib design fails, the more clearly the desirably achievable effect of a turbulent flow in normal operating conditions.

Like this example Figures 2 and 4 can be seen, which are formed in the longitudinal direction 26 opposite end portions 35 of the film member 21 without fine profiling. This ensures, in particular, an improved exit-side outlet of water from the package 20 according to the invention. This positive effect is further supported by the fact that channels 36 and 37 extending in the fin-profiling-free end regions 35 of the film elements 21 are oblique to the longitudinal extent 26 of the film elements 21, as this is a synopsis of FIGS. 6 and 7 lets recognize. In this case, a film element 21 per flow channel 25 has two grooves 36 and 37, which are aligned in a V-shape to each other. These two grooves 36 and 37 lead into a common outlet 38, which is aligned in the direction of the longitudinal extent 26 of the film elements 21.

The FIGS. 8 and 10 let a package 20 of the invention recognize the sake of clarity in the illustrated embodiment, only two in Thickness direction 40 consecutively arranged film elements 21 has.

In the intended use case, the pack 20 with respect to the drawing level after Fig. 8 supplied with air from below, as indicated by the arrows 27. The air flows into the flow channels 25, flows through the package 20 and leaves behind with respect to the plane of the drawing Fig. 8 upper side again. In countercurrent thereto, the packing 20 is charged with water, with respect to the plane of the drawing Fig. 8 from above in correspondence with the arrows 28. The water trickles through the pack 20 with respect to the plane of the drawing Fig. 8 from top to bottom and leaves the package 20 with respect to the plane of the drawing Fig. 8 over the lower end region 35.

The flow channels 25 of the film elements 21 arranged one behind the other in the thickness direction 40 complement each other to form film pairs 39, as shown in particular in the sectional view Fig. 10 lets recognize.

Fig. 11 can be seen that the arranged in the thickness direction 40 consecutively film elements 21 each provide zigzag-shaped flow channels 25, wherein the flow channels 25 of adjacent film elements 21 extend with opposite inclination and intersect to form the contact points 29 with each other. In this case, the wave crests 23 and wave troughs 24 close to a corrugation 22 of the profile elements 21 in the width direction 41 to each other, as well as well Fig. 11 is apparent.

According to a second embodiment of the invention, which in the FIGS. 12 and 13 is shown, the film elements 21 are equipped with longitudinally 26 straight extending flow channels 25, wherein the flow channels 25 are divided into sections which are offset in the width direction 41 to each other. In contrast to the preferred embodiment according to the above FIGS. 2 to 11 So no zigzag-shaped configuration of the flow channels 25 is provided.

According to the preferred embodiment of the FIGS. 2 to 11 In addition, it is provided that the fine profiling 31 of the film elements 21, with the exception of the end region 35, extends over the entire surface of the large areas 30. The alternative Embodiment according to the FIGS. 12 and 13 shows a fine profile 31, which is interrupted in the longitudinal direction 26 of the film element 21 by areas 42 without fine profiling. Such a configuration may arise in particular for manufacturing reasons.

The fine profile according to the invention is formed by a ribbing 32, as already described above with reference to FIG Fig. 5 described. The ribbing 32 has longitudinally 26 consecutive rib webs 33 and rib grooves 34, each rib web 33 provides a rib web platform 43. According to the invention, it is provided that the transitions between successive rib webs 33 and rib grooves 34 are substantially free of radii. With respect to the width of the rib web plateaus 43, that is, with respect to the extent of the rib web plateaus 43 in the longitudinal direction 26, it is preferred that the transition radii be <20%, preferably <10%, more preferably <5% of the rib web plateau width of the associated rib web 33 are formed.

In combination of the flow channels 25 of two adjacent film elements 21 results in a pair of film pairs 39, as shown in the sectional view Fig. 10 in particular reveals. Here, a polygonal, preferably hexagonal configuration of the film pair channel 39 is preferred, as in Fig. 10 shown.

For the purpose of configuring the cross-sectionally hexagonal film pair channel 39, a flow channel 25 delimited by three strip elements 44, 45 and 46 is provided for each film element 21. In this case, the edge lengths, that is, the widths of the strip elements 44, 45 and 46 differ from each other.

The strip elements 45 and 46 are formed in their width, that is based on the cross section in their edge length equal and exceed the width of the first strip portion 44 and with respect to the cross section of its edge length. The edge length S1 of the first strip element 44 and the edge lengths S2 of the second strip elements 45 and third strip element 46 are shown in FIG Fig. 10 drawn by way of example. In this case, the width or edge ratio S1 / S2 is preferably between 0.3 and 0.4, most preferably 0.35. <B> reference numerals </ b> 1 cooling tower 24 trough 2 Cooling tower mantle 25 flow channel 3 Water collection tray 26 longitudinal direction 4 pillar 27 air 5 supply pipe 28 water 6 support strut 29 point of contact 7 Axial 30 large area 8th fan wheel 31 siping 9 transmission assembly 32 ribbing 10 engine 33 rib web 11 wave 34 rib groove 12 cooling installations 35 end 13 height direction 36 gutter 14 liquid distribution 37 gutter 15 distributor 38 outlet 16 jet 39 Foil pair of channel 17 arrow 40 thickness direction 18 arrow 41 width direction 19 arrow 42 Area 20 pack 43 Rib web Plateau 21 film element 44 first strip section 22 curl 45 second strip section 23 Wellenberg 46 third strip section

Claims (13)

A packing for a heat and / or mass transfer between liquid and gaseous media in countercurrent, in particular for the water cooling by air in cooling towers, with a plurality of foil elements (21) profiled by corrugations (22), wherein the corrugations (22) have flow channels (25 ) and wherein the film elements (21) in the thickness direction (40) are arranged one behind the other forming contact points (29), wherein adjacent film elements (21) are connected to one another in their contact points (29) and wherein the facing large areas (30) are adjacent Film elements (21) have a fine profile (31), characterized in that the fine profile (31) has a transversely to the flow channels (25) extending ribbing (32) with rib webs (33) and rib grooves (34), wherein between two adjacent rib webs (33) a rib groove (34) is arranged, wherein the transitions between successive ribs tegen (33) and rib grooves (34) are formed substantially free of radii. Pack according to claim 1, characterized in that the corrugations (22) in the longitudinal direction (26) of the film elements (21) inclined, preferably zigzag-shaped flow channels (25) provide, wherein the film elements (21) in the thickness direction (40). are arranged alternately, so that the flow channels (25) of adjacent foil elements (21) extend with opposite inclination and intersect to form the contact points (29). Pack according to Claim 1 or 2, characterized in that the transition radii of less than 20%, preferably less than 10%, even more preferably less than 5%, of the rib web plate width of the associated rib web (33) are formed. Pack according to one of the preceding claims, characterized in that a ribbed groove (34) has a groove depth of 2 mm to 3 mm, preferably of 2.2 mm to 2.8 mm, more preferably of 2.4 mm to 2.6 mm , most preferably 2.5 mm. Pack according to one of the preceding claims, characterized in that in the longitudinal direction (26) opposite end portions (35) of a film element (21) are formed without fine profiling. Pack according to claim 5, characterized in that in the fine profiling-free end regions (35) of the film elements (21) obliquely to the longitudinal extent (26) of the film elements (21) extending grooves (36, 37) are formed, in which the flow channels (25) open , Pack according to claim 6, characterized in that a film element (21) per flow channel (25) has two grooves (36, 37), which are aligned in a V-shape to each other. Pack according to claim 7, characterized in that the two grooves (36, 37) open into a common outlet (38), which is aligned in the direction of the longitudinal extent (26) of the film elements (21). Pack according to one of the preceding claims, characterized in that the mutually facing flow channels (25) of adjacent film elements (21) form a film pair channel (39), the input and output side each having a polygonal, preferably hexagonal channel cross-section. Pack according to one of the preceding claims, characterized in that the corrugations (22) of the film elements (21) in the longitudinal direction (26) of the film elements (21) extending first strip portion (44) and arranged along its respective longitudinal edges a second and a third Strip portion (45, 46), wherein the second and the third strip portion (45, 46) to the first strip portion (44) are aligned inclined. A package according to claim 10, characterized in that the second and third strip portions (45, 46) are of the same width and each have a width exceeding the width of the first strip portion (44). Pack according to claim 11, characterized in that the width ratio of the first strip portion (44) and the second strip portion (45) or of the first Strip portion (44) and third strip portion (46) is between 0.3 and 0.4, preferably 0.35. A pack according to claim 10 or 11, characterized in that the width of the first strip portion is at least 5 mm, preferably between 7 mm and 18 mm, more preferably between 8.5 mm and 9.5 mm.

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