HEAT EXCHANGER AND ADSORPTION MACHINE

Abstract

The invention relates to a heat exchanger (10) of an adsorption machine, comprising—at least two heat transport pipes (15) and/or heat transport pipe sections, which are arranged at a distance (A) with respect to one another in such a way as to form at least one interspace, which is designed as a steam flow duct (18), —and pipe attachments (20) connected to the heat transport pipes (15) and/or heat transport pipe sections. According to the invention, the pipe attachments (20) are arranged in the interspace and designed as a substrate for a directly applied, binder-free active material coating (25), wherein the heat transfer grid (50) consisting of the coated pipe attachments (20) together with the heat transport pipes (15) and/or heat transport pipe sections has a steam-side outer surface of 500-3600 m.sup.2/m.sup.3.

Claims

1. A heat exchanger (10) of an adsorption machine, comprising: at least two heat transport pipes (15) and/or heat transport pipe sections, which are arranged at a distance (A) with respect to one another in such a way as to form at least one interspace, which is designed as a steam flow duct (18), and pipe attachments (20) connected to the heat transport pipes (15) and/or heat transport pipe sections, characterized in that the pipe attachments (20) are arranged in the interspace and designed as a substrate for a directly applied, binder-free active material coating (25), wherein the heat transfer grid (50) consisting of the coated pipe attachments (20) together with the heat transport pipes (15) and/or heat transport pipe sections has a steam-side outer surface of 500-3,600 m.sup.2/m.sup.3, in particular of 800-3,200 m.sup.2/m.sup.3.

2. The heat exchanger (10) according to claim 1, characterized in that the heat transport pipes (15) and/or heat transport pipe sections are designed as flat ducts and/or ducts having a rectangular cross-section.

3. The heat exchanger (10) according to claim 1, characterized in that the pipe attachments are designed as fins (35) and/or lamellae (30) and/or woven layers and/or knitted layers and/or fiber layers and/or chip layers.

4. The heat exchanger (10) according to claim 1, characterized in that the active material coating (15) has a mean layer thickness of 20-500 μm, in particular of 30-300 μm and an active material mass of 30-500 g/m.sup.2, in particular of 50-250 g/m.sup.2.

5. The heat exchanger (10) according to claim 1, characterized in that the pipe attachments (20) are formed from aluminum and are soldered and/or sintered and/or glued together with the heat transport pipes (15) and/or heat transport pipe sections.

6. The heat exchanger (10) according to claim 1, characterized in that the thickness of the pipe attachments (20) is >50 μm, in particular >100 μm, and <500 μm, in particular <250 μm.

7. The heat exchanger (10) according to claim 1, characterized in that the pipe attachments (20) within the steal flow duct (18) have a mean distance (mA) of 0.2-3.0 mm from one another.

8. The heat exchanger (10) according to claim 1, characterized in that the pipe attachments (40) within the steam flow duct (18) have an area of 800-4.000 m.sup.2/m.sup.3, in particular of 1.100-3.200 m.sup.2/m.sup.3.

9. The heat exchanger (10) according to claim 1, characterized in that the distance (A) between the heat transport pipes (15) and/or heat transport pipe sections is 4.0-30.0 mm, in particular 8.0-15.0 mm.

10. The heat exchanger (10) according to claim 3, characterized in that the pitch number of pipe attachments arranged within the interspace, in particular of fins (35) arranged next to one another, is between 0.7 and 2.5.

11. The heat exchanger (10) according to claim 3, characterized in that on the level (HA) of the mean distance of the pipe attachments (20), in particular of fins (35) arranged next to one another, the mean distance (AA) between opposite active material surfaces is at least 1.5 times larger than the mean layer thickness of the active material coating (25).

12. The heat exchanger (10) according to claim 1, characterized in that the active material is zeolite and/or a porous aluminum phosphate and/or a metal organic framework.

13. The heat exchanger (10) according to claim 1, characterized in that the length of the maximum heat transport path (LW) from a surface of the active material coating (25) up to the inner side (60) of a nearest heat transport pipe (15) and/or heat transport pipe section is 2.5 to 8.0 mm, in particular 3.0 to 5.0 mm.

14. A heat exchanger (10) of an adsorption machine, comprising: at least one heat transport pipe (15) and/or at least one heat transport pipe section, and pipe attachments (20) connected to the heat transport pipe (15) and/or heat transport pipe section, wherein at least on one side of the heat transport pipe (15) and/or the heat transport pipe section, a steam flow area is designed or designable, wherein the pipe attachments (20) are arranged at least on this side of the heat transport pipe (15) and/or heat transport pipe section and are designed as a substrate of a directly applied, binder-free active material coating (25), wherein the heat transfer grid (50) resulting from the coated pipe attachment together with the heat transport pipe (15) and/or heat transport pipe section has a steam-side outer surface of 500-3,600 m.sup.2/m.sup.3, in particular of 800-3,200 m.sup.2/m.sup.3.

15. An adsorption machine having a heat exchanger (10) according to claim 1.

Description

[0076] Shown are in:

[0077] FIGS. 1a and 1b various embodiments of a heat exchanger according to the invention in a side view;

[0078] FIG. 2 an embodiment of the heat exchanger according to the invention in a perspective view; and

[0079] FIG. 3 the illustration of a heat transfer grid.

[0080] In the following, the same reference numerals will be used for identical parts or parts of identical action.

[0081] In FIGS. 1a and 1b, heat exchangers 10 according to the invention or at least a section of a heat exchanger 10 according to the invention are illustrated.

[0082] A heat exchanger 10 or a partial segment of a heat exchanger 10 substantially comprises two heat transport pipes 15, which are arranged at a distance A from one another. The distance between the heat transport pipes 15 preferably is 4.0 mm to 30.0 mm, in particular 8.0 mm to 15.0 mm.

[0083] Due to this distance A, an interspace is built between the two heat transport pipes 15. This interspace is formed as a steam flow duct 18. In the direction of vision onto the heat exchanger 10 according to FIG. 1a, steam may thus flow into the steam flow duct 18.

[0084] Furthermore, it can be recognized that pipe attachments 20 are formed between the heat transport pipes 15. The pipe attachments 20 are arranged within the interspace and thus within the steam flow duct 18, and serve as a substrate of a directly applied, binder-free active material coating 25.

[0085] According to the embodiment in FIG. 1a, the pipe attachments 20 are formed from lamellae 30. The lamellae 30 are substantially formed from metal stripes arranged between the two heat transport pipes 15. Preferably, the lamellae 30 are made of an aluminum material. The heat transport pipes 15 as well are preferably formed from aluminum. In the present exemplary embodiment, the lamellae 30 are arranged to be uniformly spaced from one another. The lamellae 30 are soldered together with the heat transport pipes 15, for example.

[0086] The lamellae 30 substantially have two large side faces 31 and 31. Both sides 31 and 32 are provided with the active material coating 25. Furthermore, surface portions 40 of the heat transport pipes 15 as well are coated with active material and thus have an active material coating 25.

[0087] The coated lamellae 30 together with the heat transport pipes 15 build a heat transfer grid having a steam-side outer surface of 500-3,600 m.sup.2/m.sup.3.

[0088] The active material coating 25 preferably has a layer thickness of 30 to 300 μm. Furthermore, the active material mass preferably is 30-500 g/m.sup.2.

[0089] The thickness of the pipe attachments 20, in this case of the lamellae 30, preferably is between 50 μm and 500 μm, in particular 100 μm-250 μm. The thickness of the pipe attachments, in particular of the lamellae 30, is formed in FIG. 1a between the side faces 31 and 32. Between each of two lamellae 30, a mean distance mA of 0.2-3.0 mm is in particular formed.

[0090] All of the pipe attachments 20, i.e., in the present case all of the lamellae 30 form an area of 800-4.000 m.sup.2/m.sup.3 within the steam flow duct 18.

[0091] FIG. 1a furthermore shows the length of the maximum heat transport path LW. This maximum heat transport path LW extends from a surface of the active material coating 25 up to the inner side 60 of the respectively nearest heat transport pipe 15. The length is 2.5-8.0 mm, in particular 3.0-5.0 mm.

[0092] Since the structure of the heat exchanger 10 is based on the fact that the pipe attachments 20 are formed between at least two heat transport pipes 15, and the active material coating 25 is formed on the pipe attachments 20, the most maximum heat transport path LW is given in conjunction with the surface portion of the active material coating 25, which is formed centrically between the at least two heat transport pipes 15 or on the level of half the distance A between the heat transport pipes 15. The further surface portions each are arranged at a shorter distance from the heat transport pipes 15 and thus to the inner sides 60, so that the respective heat transport path is shorter than the plotted maximum heat transport path.

[0093] In FIG. 1b, an alternative embodiment with respect to the pipe attachments 20 is illustrated.

[0094] These pipe attachments are formed by fins 35. The fins 35 are in particular formed by bending a sheet metal or a metal layer. These fins 35 have two side faces 31, 32, which, in turn, are provided with an active material coating 25.

[0095] The fins 35 are in particular soldered together with the heat transport pipes 15. For this purpose, the fins 35 are connected to the heat transport pipes 15, for example, at the tops 36. These tops 36 may also be designated as peaks. The actual configuration does not need to be pointed. In fact, these areas 36 may be formed to be flatly rounded so that a connection to the heat transport pipes 15 is easily possible.

[0096] In the area of level HA, the mean fin distances mA are formed. The mean distance mA of the fins 35 from one another preferably is between 0.2 and 3.0 mm. The level HA relates in this case approximately to the mean distance of the two heat transport pipes 15 from one another.

[0097] The fins 35 are formed having such a distance mA from one another that a pitch number of less than 2 is formed. The pitch number describes in this case the number of fin curves, i.e., of two single fins per mm. The pitch number is in particular between 0.7 and 2.5.

[0098] On the level HA of the mean fin distance, the distance between the opposite active material surfaces AA is at least 1.5 times larger than the mean layer thickness of the active material coating. The distance between the opposite active material surfaces AA is, as it is illustrated in FIG. 1b, smaller than the mean distance mA. This distance AA is 1.5 times larger than the mean layer thickness of the active material coating 25.

[0099] In FIG. 1b, the length of the maximum heat transport path LW is moreover plotted. This maximum heat transport path LW extends from a surface of the active material coating 25 up to the inner side 60 of the respectively nearest heat transport pipe 15. The length is 2.5 to 8.0 mm; in particular 3.0 to 5.0 mm.

[0100] The most maximum heat transport path LW is given in conjunction with the surface portion of the active material coating 25, which is formed centrically between the at least two heat transport pipes 15. In the illustrated configuration of the pipe attachments 20 as fins 35, these are the surface portions that are formed on the level HA of the mean fin distances.

[0101] In FIG. 2, a part of the heat exchanger 10 is illustrated in a perspective view. It can be recognized in this view that the heat transport pipes 15 are formed as flat ducts or as ducts having a rectangular cross-section. A steam flow duct 18 is likewise illustrated. The steam can flow in between the ducts formed by the fins 35, and flows along the illustrated depth within the steam flow duct 18.

[0102] Furthermore, the steam flow outlet is also indicated. Due to the configuration of the heat transport pipes 15 as flat ducts, the pipe attachments 20 or the fins 35 in the illustrated example, can be mounted easily on the heat transport pipes 15. For this purpose, a connection is made in the area of the tops 36.

[0103] It is schematically illustrated in FIG. 3, which components of a heat exchanger 10 count among a heat transfer grid 50. In this case, all of the heat transport pipes 15 as well as the pipe attachments 20 arranged between the heat transport pipes 15 are concerned.

[0104] Not illustrated and also not belonging to the heat transfer grid 50, are the so-called collectors, which would be arranged according to the illustration of FIG. 3 left and right in a vertical extension. The heat transfer grid 50 extends over the entire depth (as illustrated in FIG. 2) of the heat exchanger 10.

LIST OF REFERENCE NUMERALS

[0105] 10 heat exchanger [0106] 15 heat transport pipe [0107] 18 steam flow duct [0108] 20 pipe attachment [0109] 25 active material coating [0110] 30 lamella [0111] 31, 32 side face [0112] 35 fin [0113] 36 top, peak [0114] 40 surface portion [0115] 50 heat transfer grid [0116] 60 inner side [0117] A distance of heat transport pipe [0118] AA distance of active material surfaces [0119] HA level of mean fin distance [0120] LW length of maximum heat transport path [0121] mA mean distance