DE19952639A1 - Air conditioning process comprises drying air stream by adsorbing its water content and regenerating sorption solution by desorbing water using low temperature heat and surrounding air - Google Patents

Abstract

Air conditioning process comprises drying an air stream (PL) by adsorbing the water contained in it and regenerating the sorption solution by desorbing the water using low temperature heat and the surrounding air. Drying of the air stream is carried out in a trickle film-material heat exchanger (1) so that the hygroscopic sorption solution flows as a trickle film on the separating surface and the air stream at the outlet to the heat exchanger has a lower temperature that at the inlet to the heat exchanger. An Independent claim is also included for an apparatus for carrying out the air conditioning process.

Description

The invention relates to a method for air conditioning by sorption and desorption of water using a circulating hygroscopic sorption solution, comprising the steps:

• a) drying of an air flow to be conditioned by Sorption of water contained therein and
• b) regeneration by the sorption of water low concentration sorption solution by desorption from Water using low temperature heat and Ambient air.

The invention further relates to a device for air conditioning by sorption and desorption of water by means of a circulating hygroscopic sorption solution, comprising
a fabric heat exchanger for drying an air stream by sorption of water contained therein and
a device for the regeneration of the sorption solution which is low in concentration due to the sorption of water.

A method and an apparatus of the above Art are known from DE 38 35 872 A1. In this well-known  Process and the corresponding device is the sorption of water to dry the hygroscopic sorption solution if possible isothermally carried out at ambient temperature. The Regeneration of the diluted by the sorption of water Sorption solution is carried out with low-temperature heat, the one Has temperature of 50 to 80 ° C. This temperature level is however relatively high, so that a direct use of Ab heat is often not possible or a heat transformation by means of a heat pump. Also introduces such a comparatively high temperature level at the direct use of solar energy for desorption at relatively high levels Radiation and convection losses or it becomes relative complex measures to reduce these losses are required Lich. Furthermore, the sorption solution has a relatively high salt focus on what the risk of crystallization of the Salt in the sorption solution contains.

The present invention was based on the object Method and a device of the type mentioned develop that with little technical effort and high Flexibility an environmentally friendly and highly efficient Allow air conditioning.

With regard to the method, this object is achieved according to the invention solved in that the drying of the to be conditioned Air flow in a trickle-film heat exchanger leads such that the hygroscopic sorption solution as Trickle film flows down flat at a separating surface and closes conditioning airflow at the outlet of the trickle film Heat exchanger a lower temperature than at the entry of the Has falling film-fabric heat exchanger.

With regard to the device, the object is achieved by that the fabric heat exchanger has at least one interface points at which the hygroscopic sorption solution is flat  flows down as a trickle film, with a temperature sensor having control and / or regulating device existing with which the volume flows in the device are such are controllable that the air flow to be conditioned on Leaving the fabric heat exchanger a lower temperature than at the inlet of the fabric heat exchanger.

The main advantage achieved with the invention is that for the regeneration of the low concentration sorption solution heat at ambient temperature level is already sufficient. This means that low-temperature heat can be used for desorption sources such as waste heat without intermediate Heat transformation can be used. In contrast to the one from DE 38 35 872 A1 known device and others known devices for sorption cooling, in which the Sorption solution over one in contact with the air Pack is sprayed in the sorption solution Invention in the heat exchanger not atomized. By the permanent, direct contact with the heat-dissipating separating surface improved cooling of the sorption solution is achieved. The air flow to be conditioned also does not result in any again difficult to remove liquid droplets from the Sorption solution entrained, given the usual Corrosive effect of the sorption solution using a drop separator or the like from the to be conditioned Airflow would have to be separated. Complex corrosion protection can thus all at the air outlet of the fabric heat Exchanger subsequent modules.

A preferred embodiment of the method according to the invention is that, if necessary, the temperature of the dried Air flow through humidification with resulting Evaporative cooling is further reduced. For this, the dried air stream preferably isenthalp water added  sets, the humidification as close as possible to the place of use of the air-conditioned air flow should take place.

Another advantageous embodiment of the invention The method is that the regeneration of the sorption solution is carried out with a solar collector. The Sorp tion solution is preferably depressurized in the solar collector sprinkled across the surface, whereby to absorb desorbed water crosswise or in countercurrent to the trickle film ambient air and / or exhaust air is led. The use of a solar collector for desorption offers the advantage of a simple and cost favorable system, the targeted degradation and energeti use of warm air layers in the roof area of Industrial halls or the like enables and easily in existing light trails, d. that is, in transparent roof is integrable.

Another advantageous embodiment of the invention The method is that the regeneration of the sorption Solution is carried out such that the concentration of Sorption solution after regeneration slightly above that for Outdoor air condition equilibrium concentration is. The temperature increase of the sorption solution is then between the entry and exit of regeneration the device serving the sorption solution only about 5 Kelvin, so that measures to minimize radiation and Convection losses in the solar collector can be dispensed with.

Another preferred embodiment of the invention The method is that the sorption solution in the trickle film-fabric heat exchanger through one on the other side of the Partition surface flowing down liquid film and / or one the secondary flowing along the other side of the interface air flow is cooled. The secondary air flow can  advantageously for pre-cooling the to be conditioned Airflow can be used.

According to an advantageous development of the invention The method provides that the drying of the conditioning air flow in the sorption solution heat to desorb water from one into one second circulated hygroscopic sorption solution is being used. This can be a further improvement the thermal efficiency of a system according to the invention be achieved.

Another advantageous embodiment of the invention The method is that as a hygroscopic sorption solution containing a radiation-absorbing solid particle sorption solution is used. Through this shape tion can be dependent on the circulation of the sorption solution Shading function in a transparent solar collector achieve, the shading in an advantageous manner each coincides with the sun's radiation.

Further preferred and advantageous embodiments of the Invention are specified in the subclaims.

The invention will be explained in more detail below drawing illustrating examples. in the individual show

Fig. 1 is a schematic representation of a device according to the invention with partially cut shown pipelines,

Fig. 2 is an enlarged sectional view of a heat exchanger in the apparatus of FIG. 1 used fabric heat,

Fig. 3 shows a further sectional view of the fuel heat exchanger along the section line AA of Fig. 2,

Fig. 4 is a representation of the temperature profile of the hygroscopic sorption solution, the air flow to be conditioned (primary air flow), a sorbent heat absorbing water trickle film and a sorption heat absorbing secondary air flow each over the height of a separating surface of the material heat exchanger, and

Fig. 5 is a schematic representation of a second embodiment of a device according to the invention, in which the heat generated during the drying of the air stream to be conditioned in the sorption solution is used for the desorption of water from a hygroscopic sorption solution conducted in a second circuit.

The air conditioning device shown in Fig. 1 has a fabric heat exchanger 1 for drying a primary air flow PL. The primary air flow PL is drawn in from the outside air AU from the surroundings by means of a fan 2 via a pipe 3 . With 4 a filter upstream of the fan 2 is designated. Between the fan 2 and the fabric heat exchanger 1 , a heat exchanger 5 is arranged, which is used for pre-cooling the primary air flow PL.

The fabric heat exchanger 1 contains a plurality of partitions 6 , which consist for example of plastic and preferably have hydrophilic surface properties (see. Fig. 2). The partitions 6 define several air channels, namely channels 7 for the passage of the primary air flow PL and channels 8 for the passage of a secondary air flow SL. The separating surfaces 6 are aligned substantially vertically, with a hygroscopic sorption solution flowing down flat as a trickling film 9 on the side facing the primary air flow PL. The separating surfaces 6 are formed sinusoidally corrugated to extend the running length of the trickling films at least on the sides facing the primary air flow PL and are connected to one another by spacers (not shown) to improve the mechanical stability.

The hygroscopic sorption solution is supplied to the respective separating surfaces 6 of the material heat exchanger 1 via a distribution device. The distribution device comprises a plurality of channels 11 which are open at the top and whose long sides are formed by the separating surfaces 6 . The separating surfaces 6 are each provided with rows of holes in the region of the long sides of the channels 11 , which consist of a plurality of equally spaced bores. Porous, permeable plastic plugs 12 are inserted into the holes. About these plugs 12 , the concentrated hygroscopic solution flows from the channels 11 and forms a flat trickling film 9 on the sides of the separating surface facing the primary air PL. The sorption solution flowing down at the separating surfaces removes the water contained therein from the primary air flow PL and is collected in collecting trays 13 arranged at the lower end of the separating surfaces 6 and a reservoir 14 is supplied. The sumps 13 are arranged in the direction of the reservoir 14 with a slope and have a substantially union-shaped cross-section which supports the flow line of the primary air flow PL in the fabric heat exchanger 1 . The primary air flow PL dried in the fabric heat exchanger 1 is conducted via a pipeline 15 into a room to be air-conditioned (not shown). If necessary, water 40 is added to the pre-air-conditioned primary air flow PL in an air humidifier 16 and thus the temperature of the primary air flow is further reduced. The humidification should take place as close as possible to the primary air application area. An ultrasonic atomizer is preferably used for moistening.

From the reservoir 14 , the sorption solution, which is low-concentrated by the sorption of water from the primary air flow PL, is drawn in by a pump 17 and pumped to a regeneration device via a pipeline 18 , in which a fine filter 19 and a heat exchanger 20 are arranged. The low-concentration sorption solution is regenerated by desorption of water using low-temperature heat and ambient air. For this purpose, a solar collector 21 is provided, which has a sloping surface element 22 , which is seen in the flow direction of the sorption solution, a distribution device 23 is arranged upstream. The distribution device 23 consists of a tube or an upwardly open channel, wherein a row of holes consisting of a plurality of bores is formed in the side facing the plate-shaped surface element 22 . In the holes, porous, permeable plastic plugs are used, which contribute to the formation of a uniform trickle film on the inclined surface element 22 . The low-concentration sorption solution thus flows down as a flat falling film without pressure on the surface element 22 and is collected in a collecting channel 24 , from where it flows further into a pipeline 25 .

Spaced from the surface element 22 , a transparent cover 26 is arranged, which defines a gap with the surface element 22 or the trickle film, through which air, preferably exhaust air, is sucked by means of a fan 27 against the direction of flow of the trickle film and then discharged. The surface element 22 is coated with a nonwoven fabric for radiation absorption. The nonwoven fabric flowed through by the sorption solution supports the uniform formation of the flat trickling film due to capillary forces.

Instead of a nonwoven fabric, radiation-absorbing solid particles or color pigments can also be added to the circulating sorption solution. In this case, the surface element 22 of the solar collector 21 is preferably formed trans parent, for example in the form of a transparent plastic double-wall sheet. The solar collector 21 then enables daylight illumination on the one hand, namely when the pump 17 for conveying the sorption solution is switched off, and on the other hand shading due to the color pigments or solid particles in the sorption solution when the pump 17 is switched on and the flat trickling film on the surface element 22 of the solar collector 21 forms.

Desorption is a matter of mass transport process, the course of which is a water vapor partial pressure difference between the solution and the ambient air and whose intensity is determined by the mass transfer coefficient becomes. This releases water vapor into the air and thus the concentration of the solution increases. The partial pressure of the Solution at constant air pressure depends only on its temperature and concentration determined. The release of water vapor requires the provision of the steam released equivalent evaporation enthalpy and a lower Proportion of heat of dilution from the solution. The cover this amount of energy is convectively applied to the solution transferred absorbed solar energy and exhaust heat. The exhaust air temperature is usually higher than that Ambient temperature.

The required temperature level of the desorption is essentially determined by the inlet concentration at the solar collector (desorber), which is very low with the absorption carried out cooled in the material heat exchanger 1 . A desorber outlet concentration that is slightly above the equilibrium concentration belonging to the outside air condition has proven to be optimal. In this case, the temperature increase of the solution between distribution device 23 and collecting duct 24 is only approx. 5 Kelvin.

The air flow counter-current to the direction of flow of the falling film tion can be achieved by extending the air flow path thermodynamically improved. The ur sudden flow direction with a guide device (not shown) reversed at least twice in direction. Hereby becomes a longer contact time, an improved driving force usage (exploitation of the partial pressure difference) and a ver Improved mass transfer through a higher flow speed achieved with the same air mass flow.

When operating the device at a high concentration level and thus higher desorption temperatures, the intermediate sound of the heat exchanger 20 is useful, which is preferably of the "pipe in pipe" type or is integrated directly into the collecting duct 24 by a connected to the supply line 18 , of the warmer solution washed pipe is placed in the collecting channel 24 .

The sorption solution concentrated in the solar collector 21 passes through the pipeline 25 under the influence of gravity after a pre-filtration in a filter 28 to the distribution device of the material heat exchanger 1 . Below each of the channels 11 serving to distribute the sorption solution, a water distribution channel 29 is arranged, the upper wall area of which simultaneously forms the bottom of the overlying distribution channel 11 . The water distribution channels 29 each have rows of holes arranged in the area of the dividing surfaces 6 , which in turn consist of a multiplicity of bores with porous, permeable plugs inserted therein. About these plugs, the water flows from the channels 29 to the sides of the separating surfaces 6 facing away from the primary air flow PL, which are connected above the collecting trays 13 by bottom sections 30 . The water also flows in the form of flat rie self films 10 at the dividing surfaces 6 and collects on the bottom sections 30 , which have a slope corresponding to the collecting trays 13 . From there, the water reaches a collecting container 31 , to which a pump 32 is assigned, with which the water is pumped back to the distribution channels 29 . This water cycle is designed so that the circulating amount of water is greater than that to be replaced. The collecting container 31 is provided with a level control. If necessary, make-up water 40 is supplied to the collecting container 31 .

The secondary air flow SL flowing across the water trickle films 10 is generated by a suction fan 34 . The suction line 35 is equipped near its suction opening with a filter 36 . The cooler, almost saturated, moist secondary air flow SL, which is cooler due to the contact with the water trickling films 10 compared to the primary air flow PL, is used with the interposition of the heat exchanger 5 for precooling the primary air PL.

Outside air AU or exhaust air AB can be used as secondary air SL of the air-conditioned room, the exhaust air AB usually drier and cooler than the outside air AU (vice exercise air). The energetically more advantageous variant of the However, exhaust air cannot be used in every case become.

The drying of the primary air can be seen as a counterpart to the process taking place in the solar system, ie the partial pressure of the concentrated sorption solution is lower than that of the primary air. When the sorption solution absorbs water, it produces heat of vaporization and a small amount of heat of dilution. Inadequate heat dissipation would result in undesired heating of the sorption solution. This would stop drying and heat the primary air. With the very good thermal coupling of sorption solution trickle film and cooling water trickle film via a common separating surface 6 , this is avoided and significant cooling of the primary air PL is already achieved.

The device according to the invention is further equipped with a control device having several temperature sensors (not shown), with which the volume flows in the device can be controlled such that the primary air flow PL at the outlet of the material heat exchanger 1 has a lower temperature than at the inlet of the Has fabric heat exchanger. In Fig. 4 is an example of the temperature profile of the hygroscopic sorption solution, the primary air flow PL, the water trickle film and the secondary air flow SL each shown over the height of a separating surface 6 of the material heat exchanger. In Fig. 1 with 37 , 38 valves are characterized, which allow adjustment of the solar collector 21 supplied volume flow of the sorption solution, the valve 38 being arranged in a supply line 18 with the return line 25 short-circuiting connecting line 39 . The valve 37 is open in the operating state and the valve 38 is closed. By means of the valves 37 and 38 , the circulating amount of solution in the fabric heat exchanger 1 can be increased compared to the amount of solution passing through the solar collector 21 . In this way the wettability can be improved as a result of higher mass flows. During the starting phase of the device according to the invention, the passage through the solar collector 21 can be prevented by closing the valve 37 and opening the valve 38 .

The system according to the invention is suitable for building air conditioning with high purity requirements for the supply air. The fabric heat exchanger 1 and the solar collector 21 can be arranged spatially separated from one another. Due to the shading function and the use of exhaust air, the system is particularly suitable for buildings with a high proportion of glazing and internal heat loads. The system enables air conditioning to be carried out preferentially in the partial load range during the night or periods with little sun radiation. For this purpose, the fabric heat exchanger 1 is operated either as a purely indirect evaporative cooling system without drying capacity or with limited drying capacity (desorption only with exhaust air or ambient air). An exclusive restriction to the function of air drying is also possible.

In Fig. 5, a second embodiment of an inventive device according to the invention is shown schematically. The elements that correspond to those of the first exemplary embodiment are provided with the same reference numerals. The main difference of the second embodiment compared to the first embodiment is that the heat generated during the drying of the primary air flow PL to be conditioned in the sorption solution is used to desorb water from the low-concentration hygroscopic sorption solution. For this purpose, the device comprises two fabric heat exchanger or heat exchange material portions 1 A and 1 B. The concentrated in the solar collector 21 through desorption of water sorption solution passes via the tube 25, initially in the fuel heat exchanger 1 A, in which it runs down at a parting face 6 A surface as a trickling film and fed through the conduit 3 primary air stream PL by sorption of contained Water dries. The sorption solution is then passed into the second material heat exchanger 1 B, where it in turn runs flat at a separating surface 6 B as a trickle film and dries the primary air flow PL supplied via the pipeline 3 by sorption.

Subsequently, the sorption solution diluted as a result of the water absorption is pumped back to the first material heat exchanger 1 A by means of a pump 17 A and, on the opposite side of the separating surface 6 A, which faces the secondary air flow SL supplied via the pipeline 35 , again sprinkled over the surface as a trickle film. The sorption solution then reaches the storage container 14 , from where it is pumped to the solar collector 21 by means of the pump 17 via the pipeline 18 .

In the second material heat exchanger 1 B, the sorption solution is cooled by means of a water film running down on the other side of the separating surface 6 B. The falling water film is collected in a drip pan and fed to the collection container 31 . From there, the water is pumped via the pump 32 in the circuit back to one of the partition surface 6 B assigned distribution system.

The pumped back by means of the pump 17 A in the first material heat exchanger 1 A diluted sorption solution has a lower temperature than that from the solar collector 21 via the pipe 25 to the material heat exchanger 1 A flowing in concentrated sorption solution. The heat generated during the drying of the primary air flow PL in the first material heat exchanger 1 A in the sorption solution is released via the separating surface 6 A to the low-concentration sorption solution, whereby part of the water contained therein is already desorbed before the solar collector 21 . The desorbed water is taken up by the secondary air flow SL and discharged with it via the pipeline 35 .

The invention is not restricted to the exemplary embodiments described above. Rather, a number of variants are conceivable which make use of the inventive idea given in the patent claims even with a different design. For example, the primary air flow PL can not only be conducted in countercurrent to the solution trickling films 9 in the fabric heat exchanger 1 , but also in parallel with it.

Reference list

FO exhaust air
TO supply air
AU outside air
AB exhaust air
SL secondary air
PL primary air

1

Fabric heat exchanger

1

A fabric heat exchanger

1

B Fabric heat exchanger

2nd

fan

3rd

Pipeline (primary air)

4th

Filter (primary air)

5

Heat exchanger (primary air / secondary air)

6

Interface

6

A interface

6

B interface

7

Primary air duct

8th

Secondary air duct

9

Trickle film (sorption solution)

10th

Water trickle film

11

Distribution channels (sorption solution)

12th

permeable plastic plugs

13

Drip pan (sorption solution)

14

Storage container (sorption solution)

15

Pipeline

16

Humidifier (e.g. ultrasonic atomizer)

17th

Pump (sorption solution)

17th

A pump (sorption solution)

18th

Pipeline (sorption solution)

19th

Ultra-fine filter (sorption solution)

20th

Heat exchanger (solution / solution)

21

Solar collector

22

Surface element

23

Distribution device

24th

Collecting channel

25th

Pipeline (sorption solution)

26

transparent cover

27

fan

28

Prefilter (sorption solution)

29

Distribution channels (water)

30th

Floor sections

31

Collection container (water)

32

Pump (water)

33

Pipeline

34

Fan (secondary air)

35

Suction line (secondary air)

36

filter

37

Valve

38

Valve

39

Connecting line

40

Make-up water

Claims (29)

1. A method for air conditioning by sorption and desorption of water using a circulated hygroscopic sorption solution, comprising the steps:

• a) drying an air stream to be conditioned by sorption of water contained therein and
• b) regeneration of the sorption solution, which is low-concentrated by the sorption of water, by desorption of water using low-temperature heat and ambient air,
  characterized in that the drying of the air flow (PL) to be conditioned is carried out in a trickle film-material heat exchanger ( 1 ) in such a way that the hygroscopic sorption solution flows down as a trickle film at a separating surface ( 6 ) and the air stream (PL) to be conditioned at the outlet of the trickle-film heat exchanger ( 1 ) has a lower temperature than at the inlet of the trickle-film heat exchanger.

2. The method according to claim 1, characterized in that the tempera of the dried air stream (PL) by humidification with resulting evaporative cooling further reduced becomes. 3. The method according to claim 1 or 2, characterized in that the regeneration of the sorption solution is carried out with a solar collector ( 21 ). 4. The method according to claim 3, characterized in that the sorption solution in the solar collector ( 21 ) sprinkled flat without pressure and is guided transversely or in countercurrent to this trickle film ambient air and / or exhaust air. 5. The method according to any one of claims 1 to 4, characterized in that the Regeneration of the sorption solution is carried out in such a way that the concentration of the sorption solution after regeneration slightly above that associated with the outside air condition Equilibrium concentration. 6. The method according to any one of claims 1 to 5, characterized in that the Regeneration of the sorption solution is carried out in such a way that their temperature increases by less than 6 Kelvin. 7. The method according to any one of claims 1 to 6, characterized in that the low-concentration sorption solution is fed to a heat exchanger ( 20 ) in which it is preheated by already regenerated sorption solution. 8. The method according to any one of claims 1 to 7, characterized in that the sorption solution in the trickle film-heat exchanger ( 1 ) by a liquid film ( 10 ) flowing down on the other side of the separating surface ( 6 ) and / or one on the other side the separating surface ( 6 ) is cooled along the flowing secondary air flow (SL). 9. The method according to claim 8, characterized in that the Secondary air flow (SL) for pre-cooling the to be conditioned Air flow (PL) is used. 10. The method according to any one of claims 1 to 9, characterized in that the at Drying of the air flow to be conditioned (PL) in the Sorption solution generated heat for the desorption of water from a hygroscopic in a second circuit Sorption solution is used. 11. The method according to any one of claims 1 to 10, characterized in that as hygroscopic sorption solution a radiation absorbing Sorbent solution containing solid particles is used. 12. The method according to any one of claims 1 to 11, characterized in that the Drying of the airflow to be conditioned during Night hours and / or low-radiation periods set or the drying performance is reduced. 13. A device for air conditioning by sorption and desorption of water by means of a circulating hygroscopic sorption solution, comprising
a fabric heat exchanger ( 1 ) for drying an air stream by sorption of water contained therein and
a device for the regeneration of the sorption solution which is low in concentration due to the sorption of water,
characterized in that the material heat exchanger ( 1 ) has at least one separating surface ( 6 ) on which the hygroscopic sorption solution flows down as a trickle film ( 9 ), and in that a control and / or regulating device having temperature sensors is provided with which the volume flows are controllable in the device such that the air flow (PL) to be conditioned has a lower temperature at the outlet of the material heat exchanger ( 1 ) than at the inlet of the material heat exchanger. 14. The apparatus according to claim 13, characterized in that the fabric heat exchanger ( 1 ) is followed by an air humidifier ( 16 ) for evaporative cooling of the dried air stream to be conditioned (PL). 15. The apparatus according to claim 13 or 14, characterized in that the device for regenerating the sorption solution is designed as a solar collector ( 21 ). 16. The device according to one of claims 13 to 15, characterized in that the fabric heat exchanger ( 1 ) has a plurality of partitions ( 6 ), on each side of which the sorption solution flows down as a trickle film ( 9 ) and on the other Side a cooling fluid, in particular water also flows down as a trickle film ( 10 ). 17. The apparatus according to claim 16, characterized in that the separating surfaces ( 6 ) are formed from plastic which has hydrophilic surface properties at least on the side in contact with the sorption solution. 18. The apparatus according to claim 16 or 17, characterized in that the separating surfaces ( 6 ) are corrugated in the direction of flow of the sorption solution and the cooling fluid. 19. Device according to one of claims 16 to 18, characterized in that each separating surface ( 6 ) is associated with a distribution device for the sorption solution and a distribution device for the cooling fluid, wherein each distribution device is tubular or channel-shaped and a plurality of lateral bores having. 20. The apparatus according to claim 19, characterized in that porous, permeable plugs ( 12 ) are inserted into the bores. 21. Device according to one of claims 13 to 20, characterized in that the device for regeneration of the sorption solution has a surface element ( 22 ), which is seen in the flow direction of the sorption solution, a distribution device ( 23 ) is arranged upstream, from which the sorption solution is depressurized over the surface element ( 22 ) flows to a collecting channel ( 24 ). 22. The apparatus according to claim 21, characterized in that a transparent cover ( 26 ) is arranged spaced from the surface element ( 22 ). 23. The device according to claim 22, characterized in that a fan ( 27 ) for generating an air flow between the surface element ( 22 ) and the cover ( 26 ) is provided. 24. The device according to claim 23, characterized in that the Device for regeneration of the sorption solution in such a way is formed that the air flow therein across or in Countercurrent to the sorption solution flows.   25. Device according to one of claims 23 or 24, characterized in that the Device for the regeneration of the sorption solution several Guides for redirecting the air flow having. 26. Device according to one of claims 21 to 25, characterized in that the surface element ( 22 ) has a coating made of a nonwoven fabric in contact with the sorption solution. 27. The device according to one of claims 13 to 26, characterized in that a heat exchanger ( 20 ) is provided for heat transfer from the outlet of the device for regeneration of the sorption solution to its inlet. 28. Device according to one of claims 13 to 27, characterized in that the inflow and in the course of the device for regeneration of the sorption solution temperature sensors and / or concentration sensors are arranged. 29. Device according to one of claims 13 to 28, characterized in that a heat exchanger ( 5 ) for heat transfer from the air flow to be conditioned (PL) to a secondary air flow (SL) is provided.