EP1172626A2 - Use of a heat exchanger - Google Patents

Abstract

Use of a heat exchanger for controlling the temperature and/or climate in rooms is new. The heat exchanger has a media guiding body with two groups of crossing channels (24) for the media, one channel group being tubular and the other group being shaft-like, the latter channel group being formed from bars (30). The tubular channels and the bars are produced from a film made of thermoplastic or a heat conducting metal. Preferred Features: Room air is fed through one group of channels and cooling air is fed through the other group of channels.

Description

The invention relates to the use of a Heat exchanger with the features explained in claim 1.

Known heat exchangers of this type are used as coolers for the Cooling water or the lubricating oil of internal combustion engines (cf. DE 199 39 531 C1) and as an aggregate for Condensation dryer (see DE 198 38 525 A1) designed and characterized by a low weight as well through a simple and inexpensive to build Construction.

The object of the present invention is heat exchangers of this kind to lead to a new area of application according to the invention in the use of the heat exchanger Temperature control or climate control in rooms exists.

The use of the heat exchanger thus offers, for example, the Possibility of the passenger compartment of vehicles or Building rooms both to cool and to warm, depending after what combination of appropriate media according to claims 2 or 3 through the channels of the a formed plastic film Media guide body are passed through.

Is accordingly refrigerant through the tubular channels Dehumidification passed for the purpose of air cooling, forms the heat exchanger has a condenser, while this is Passing heated cooling water through these channels Function of a heating register for heating the room air in Buildings or in a passenger compartment.

Figur 1

eine Vorderansicht eines ursprünglich einen Kühler für das Kühlwasser einer Verbrennungskraftmaschine bildenden, erfindungsgemäß als Heizregister zur Erwärmung einer Fahrgastzelle verwendbaren Wärmetauschers;

Figur 2

einen Querschnitt des Wärmetauschers, entlang der Linie II-II der Fig. 1 gesehen.

Figur 3

einen in Fig. 2 durch einen strichpunktierten Kreis angedeuteten Ausschnitt, in vergrößertem Maßstab;

Figuren 4a und 4b

jeweils einen Querschnitt durch eine Kunststofffolie zur Bildung eines mit lamellenartigen Stegen bestückten Flüssigkeitsrohres;

Figur 5

eine Draufsicht auf die Kunststofffolie, in verkürzter Darstellung;

Figuren 6a und 6b

jeweils einen Querschnitt durch ein aus einer Folie gemäß Fig. 4a bzw. 4b gebildetes Flüssigkeitsrohr;

Figur 7

einen Schnitt entlang der Linie VII-VII der Fig. 3; und

Figur 8

die linke Hälfte der Fig. 4a in stark vergrößerter und teilweise aufgebrochen gezeigter Darstellung.

Figur 9

einen Längsschnitt eines zur Klimatisierung eines Raumes durch Regelung der Raumluftfeuchtigkeit vorgesehenen Wärmetauschers entlang der Linie B-B der Figur 10;

Figur 10

einen Querschnitt des Wärmetauschers entlang der Linie A-A der Figur 9;

Figur 11

einen durch einen strichpunktierten Kreis angedeuteten Ausschnitt der Darstellung gemäß Figur 9, in stark vergrößertem und verkürztem Maßstab;

Figur 12

eine schaubildliche Darstellung eines einen Medienführungskörper bildenden Plattenpakets des Wärmetauschers gemäß Figur 9 und 10;

Figur 13

einen Teillängsschnitt durch ein als Zuschnitt vorgeformtes Plattenteil aus Aluminiumfolie;

Figur 14

eine Darstellung des Plattenteils gemäß Figur 13, in zusammengeschobenem Zustand;

Figur 15

eine schematische Schnittansicht der zueinander versetzten Anordnung von Stegteilstücken.

The drawing shows exemplary embodiments of heat exchangers which can be used in the sense of the invention. Show it:

Figure 1

a front view of a heat exchanger originally forming a cooler for the cooling water of an internal combustion engine and usable according to the invention as a heating register for heating a passenger compartment;

Figure 2

a cross section of the heat exchanger, seen along the line II-II of FIG. 1.

Figure 3

a section indicated by a dash-dotted circle in Figure 2, on an enlarged scale;

Figures 4a and 4b

in each case a cross section through a plastic film to form a liquid tube equipped with lamellar webs;

Figure 5

a plan view of the plastic film, in a shortened view;

Figures 6a and 6b

in each case a cross section through a liquid tube formed from a film according to FIGS. 4a and 4b;

Figure 7

a section along the line VII-VII of Fig. 3; and

Figure 8

the left half of FIG. 4a in a greatly enlarged and partially broken-open representation.

Figure 9

a longitudinal section of a heat exchanger provided for air conditioning a room by regulating the room air humidity along the line BB of FIG. 10;

Figure 10

a cross section of the heat exchanger along the line AA of Figure 9;

Figure 11

a section of the representation of Figure 9 indicated by a dash-dotted circle, in a greatly enlarged and shortened scale;

Figure 12

a perspective view of a plate pack forming a media guide body of the heat exchanger according to Figures 9 and 10;

Figure 13

a partial longitudinal section through a plate part preformed as a blank made of aluminum foil;

Figure 14

an illustration of the plate part according to Figure 13, in the pushed together state;

Figure 15

is a schematic sectional view of the staggered arrangement of web sections.

The heat exchanger shown in FIG. 1 forms one example Heating register for heating a passenger compartment one by one Internal combustion engine driven vehicle. He points in known manner on a frame 10, the side Frame legs 12 and 14 are box-shaped. The Frame leg 12 contains one via an inlet connection 16 connectable with the cooling water return flow of the internal combustion engine Water inlet chamber, while the frame leg 14 a Contains water drainage chamber that has an outlet nozzle 18 connectable to a water pump of the internal combustion engine is.

Both frame legs 12, 14 have an upper and one lower, preferably U-shaped frame legs in cross section 20 and 22 connected to each other in a corner stiff manner.

A heating network is provided within the frame 10, which consists of a variety of individual, for example horizontal extending and superimposed liquid or Water pipes 24 is formed. These are at the end, as in known with the two chambers of the frame legs 12, 14th in connection, the sealed arrangement of Water pipes 24 of the heating network on the frame legs 12, 14 using cast resin or other suitable means can be accomplished. The frame legs 12, 14 and the in the frame 10 integrated liquid or water pipes 24 form a media guide body.

In the following the construction of the water pipes 24 as well their manufacture explained in detail:

The water pipes 24 preferably have the according to FIGS. 6a and 6b Cross section of a flat tube and are in the frame 10, in a common level, one above the other, provided that their flat tube wall parts 26 and 28 lie one above the other. On both pipe wall parts 26 and 28 are in on the outside Pipe longitudinal direction at a distance from each other transversely to Pipe-axis-extending, shaft-like channels, lamellar webs 30 are provided so that the Media flowing through the heat exchanger are crossed.

The water pipes 24 consist of pressure and hydrolysis-resistant, temperature-compatible, high-strength Plastic, such as PA 6.6, PEI, PEEK, PAI or PPS, these in two steps from a plastic film 32 by preferably 0.30 mm.

This plastic film 32 is, for example, in one Thermoforming tool using a vacuum reshaped and into the shape shown in FIGS. 4a and 4b brought.

The plastic film 32 thereby has two film halves 32a and 32b, which extend in the longitudinal direction of the film extending, inverted groove-like depression 34 with each other are flexibly connected.

The side walls 36, 38 of this recess 34 expand it continuously to the outside and point to this in cross section Pitch circle shape. The bottom 40 of this recess 34 has Cross-section preferably in the form of a semicircle.

The cross-sectional shape of the groove-like recess 34 provides sure that the plastic film 32 will fold in a way leaves that both film halves 32a and 32b congruent come to lie on top of each other (see FIGS. 6a and 6b) and themselves then the tube wall parts 26, 28 to the longitudinal side, through the Channel bottom 40 formed connecting edge extend parallel and thus the pipe cross-section over the entire pipe width is equal to.

Both film halves 32a and 32b each have an outer Longitudinal edge piece 42 or 44, which to the adjoining Pipe wall part 26 or 28 are stepped in such a way that with the congruent assignment of both film halves 32a and 32b the tube wall parts run parallel to one another. to Completion of the water pipes 24 are then after folding the plastic film 32 has its longitudinal edge pieces 42 and 44 just tightly connect what for example by gluing or folding, but preferably by welding.

The lamellar webs 30 have due to the deep-drawing or possibly a U-shaped embossing process Cross section with two web wall parts. These are after the Thermal treatment of the plastic film 32 connected together and thereby so stiffened that one in the water pipes 24 possibly high operating pressure of the heat exchanger it is ensured that the webs 30 expand Side and thus a reduction in the cross section of the shaft-like air channels 46 defined by the webs 30 and a consequent reduction in the hot air throughput cannot result.

The lamellar webs 30 can be perpendicular to Extend pipe longitudinal axis. However, the in 5 shown slightly curved web formation, whereby in the folded state of the plastic film 32 the Ridges 30 support each other, as shown in FIG. 7 is indicated.

The height of the webs 30 can thereby be smaller by half be selected as if they were linear and are supported directly on the adjacent water pipe 24 would. In the latter case, the webs 30 would have to both Film halves 32a and 32b also offset from one another to a gap are formed, the engagement of the webs 30 of the one film half between those of the other Half of the film again a reduction in the cross section of the Warm air ducts would result.

As shown in FIGS. 4b and 6b, this exists Embodiment of the plastic film 32 compared to that of FIGS. 4a and 6a a constructive difference in that the flat-side tube wall parts 26, 28 a have corrugated cross section, the two wavy lines preferably run parallel to each other. This is due to the surface enlargement achieved in this way continuous cross section of the flat tube, an essential Temperature increase achievable for the air to be heated.

As can be seen from FIG. 8, the plastic film 32 has another reinforcement insert that increases their strength Form of a grid 48, which is made of glass or carbon fibers with a length of preferably 30 mm. In particular, fibers made of highly tear-resistant material are like aramid.

The grid 48 is in this case in the plastic film 32 oriented that to form the webs 30, the network breakthroughs 50 Take a diamond shape in the vertical direction of the bridge. The oblique course the mesh threads 52 at an angle of 45 ° the grid 48 during the thermal transformation of the Plastic film 32 great elasticity or stretch.

Alternatively, the plastic film can be short or long fibers are reinforced, advantageously short fibers with a relatively large web height and long fibers, for example can be used with a relatively short web height.

The frame legs 20, 22 come in the explained In this respect, the formation of the water pipes 24 according to the invention essential importance than by this at accordingly operating pressures occurring, inflation of the water pipes 24 is prevented in the vertical direction of their webs 30.

The heat exchanger shown in FIGS. 9-15 has for example five horizontal levels of indoor air flowed through, preferably approximately in cross section cylindrical room air channels 110, which are at a radial distance run parallel to each other and from level to level are preferably offset. Cross to the Room air channels 110 and extend parallel to their levels are rectangular in cross-section in a total of six levels or shaft-like cooling air channels 112.

Both types of channels 110 and 112 are one above the other stacked, preferably rectangular plates 114 one a plate pack forming a media guide body, which in turn each consist of two identical shapes and plate parts 16 and 18 symmetrically assigned to one another are made (see Figs. 11 and 12).

In the present case, these plate parts 116, 118 in one piece from a film of thermoplastic material, preferably polypropylene. You may as well in one piece from a foil made of heat-conducting metal, preferably aluminum.

Each plate member 118 is along its two opposite longitudinal edge pieces 120 and 122 with such 120 'and 122' designated the one symmetrically assigned to them Plate part 116 preferably by gluing, welding, Pressure joining or folding tightly connected.

To form the indoor air channels 110 for the damp or too Each plate part 116 or 118 is also provided with cooling room air molded, parallel, channel-like, in Cross-section semi-circular recesses 124 equipped. These can become cylindrical tubes or flat tubes complete, although in the latter case it is favorable, the two flat tube wall parts corrugated in cross section train. To form the cooling air channels 112 are to the Plate parts 116, 118 extend transversely to their depressions 124 and the airtight longitudinal edge parts 120, 122 extending, vertically protruding and parallel to each other Molded webs 126.

The heat exchanger is used to control the temperature of the room air the web wall parts of the double-walled webs 126 preferably connect each other tightly to ensure that these do not become Can inflate side.

Each plate 114 is thus characterized by upper and lower, in webs 126 lying in a common vertical plane. Recesses 124 and webs 126 give the thin Plastic films of preferably only 0.20 mm to 0.40 mm Thick existing plate parts 116, 118 a stiffness that ensures that in the mutual, firm bond of stacked plates 114 according to FIG stiffened media guide body is achieved.

11, the webs 126 of a plate 114 for forming the cooling air channels 112 engage between these webs 126 of a plate 114 located below or above them, preferably in such a way that adjacent webs 126 touch one another (1st variant ) . However, it is also conceivable for the webs 126 of two plates 114, as indicated by dash-dotted lines, to engage in the middle between those of the other plate 116, as a result of which the number of cooling air ducts 112 can be doubled and the efficiency of the heat exchanger increases (second variant) .

The plates 114 of the plate package or media guide body are together in one at their ends preferably made of plastic holding frame 128 or 130 kept sealed, which by means of an adhesive 132, preferably made of cast resin.

The webs 126 of the upper and lower plates 114 are for Formation of the outside of the heat exchanger Cooling air channels 112 each through a board 132 or 134 covered, which is also on the end in the holding frame 128, 130 are set.

The heat exchanger thus formed does not itself have any Formation of the channels 110 necessary for the condensate drain Housing on. It is a structural unit in a housing opening of an air conditioning unit can be inserted, to which Handling a handle 138 on its front face is provided. It can just as well be stuck in such a device be installed.

An inventive method for manufacturing the plate parts 18 made of metal foil is shown in FIGS. 13 and 14 illustrated.

In an aluminum foil 140 in the longitudinal direction forming guide channels 110 for the indoor air channel-like Depression sections 142 and transverse to their longitudinal extent gable roof-like sections 144, 146 formed. To do this continuous, trough-shaped depressions and across and gable roof sections in the same direction of formation formed. Finally, the film 140 in Extension direction of the groove-like recess sections 142 pushed together so that they face each other touch and the two halves of the gable roof molded sections 144, 146 for forming the webs 126 essentially abut each other.

For manufacturing the plate parts from plastic film, for example polypropylene, in a preferred thickness of about 0.20 mm, vacuum thermoforming can be used become. The foil is preheated and in a tool, preferably in a single stroke, in the desired shape drawn. The aforementioned process step of Pushing them together is then not necessary. By doing Tools are fins or sword-like metal strips used, the webs 126 shown in the figures molding.

As can be seen from Figure 15, according to another Embodiment, the web sections 150 in the longitudinal direction divided and offset from one another transversely to their longitudinal direction arranged. The fin or sword-like metal strips do not cut through the plastic film, it will quasi deep-drawn. In this way, one in Circumferential direction closed circumferential contour of the web sections 150 and a rounded leading edge 152 is reached.

Claims (3)

Using a heat exchanger with a Media management body, the two groups of themselves crossing channels (24, 46) or (110, 112) for separated media to be led, one of which Channel group (24; 110) tubular and the other Channel group (46; 112) is shaft-like and the latter channel group (46; 112) through to the tubular channels (24; 110) on the outside at a distance provided from each other and directed transversely to the tube axis Webs (30; 126) are formed, the tubular Channels (24; 110) and the webs (30; 126) from at least a formed thermoplastic (32) or a film made of a heat-conducting metal (140) are made together for temperature control or climate control in rooms. Use of a heat exchanger according to claim 1, characterized in that in one group of channels (24, 46) room air and in the other group of channels (110, 112) cooling air is guided. Use of a heat exchanger according to claim 1, characterized in that in one group of channels (46; 112) of the media guide body a gaseous medium and in the other group of channels (24; 110) a liquid medium for cooling or heating rooms.

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