Device for controlling the CO2 content of a closed volume

Abstract

Device for controlling the CO2 content of a closed volume (80) with at least three adsorber chambers (4), each filled with a CO2-adsorbing, regenerable material, characterized in that a controller (82) is provided and the device is constructed such that the controller (82) controls at least three successive cycles and, in each of the at least three cycles, a first adsorber chamber is in an adsorption mode (11), a second adsorber chamber is in a regeneration mode (12), and at least a third adsorber chamber is in a cooling mode (13).

Description

The invention relates to an apparatus for controlling the CO 2- content of a confined volume according to the preamble of claim 1.Due inter alia to climate crisis, it is becoming increasingly important today to explore under which climate conditions plants but also animals are well-fed and under which conditions they die off and survival is not ensured. For this purpose, special climate chambers have been developed with which practically all conceivable conditions can be simulated in a closed space. These climate chambers form a closed volume in which neither the temperature, nor the light or the composition of the atmosphere depends on the external conditions and can be adjusted separately.Problems are still posed by the setting of a desired carbon dioxide content (CO 2- content) of the atmosphere prevailing in the climate chamber. In order to remove CO 2 from this atmosphere, a CO 2 absorbing material, such as alkali metal and alkaline earth metal hydroxides (e.g. KOH), is often used. It is disadvantageous that this material must be disposed of when its absorptive capacity is exhausted.If the atmosphere within an air conditioning chamber is to be enriched with CO 2 CO 2 stored in pressure cylinders is often used. However, the costs thereof considerably increase the operating costs of an air conditioning chamber.The object of the invention is to provide a device for controlling the CO 2- content of a confined volume which avoids these disadvantages and can be operated inexpensively. Furthermore, the device should allow simple automatic control.The object is achieved according to the invention by a device for controlling the CO 2- content of a confined volume having the features of claim 1.According to the invention, a controller is provided and the device is constructed such that the controller actuates at least three successive cycles and, in each of the at least three cycles, a first adsorber chamber is in an adsorption mode, a second adsorber chamber is in a regeneration mode and at least one third adsorber chamber is in a cooling mode. As a result, the apparatus can be operated continuously. Fully automatic control operation is also made possible in this way. The adsorber chambers are advantageously cylindrical and are flowed through in accordance with the longitudinal axis. Because the CO 2 is only adsorbed, the adsorber chambers can only be regenerated. For adsorption, amines in solid form are advantageously used as ion exchange resin having a reactive amine group.A confined volume may be any confined space. An air conditioning chamber may be mentioned here by way of example. The advantages of the invention will be explained using this example. The region outside the closed volume can be the outer region, i.e. a region which is exposed unprotected to the weathering. If the climate chamber is accommodated in a building, it can also be an area inside the building, but outside the climate chamber.The cooling of an adsorber chamber in the cooling mode can be effected in different ways. In the simplest case, it is possible to cool the adsorber chamber exclusively by the air surrounding it. If this is not sufficient (e.g. at excessively high external temperatures), the outer wall of the adsorber chamber can also be blown in with cooled air. Most effectively, a cooled gas is allowed to flow through the adsorber chamber. According to the prevailing conditions, this can be air from the environment, or CO 2 depleted air or an inert gas in a separate closed circuit. Another possibility is to use four adsorber chambers and to operate the device in four cycles. In this way, two adsorber chambers are then in each case in the cooling mode and as a result have a longer time in the air surrounding them to cool.The adsorber chambers are generally regenerated using heated air, which flows through the adsorption material in the adsorber chamber.An adsorption vessel filled with the above-mentioned ion exchange resin can be regenerated with hot air when its CO 2- absorbency is exhausted. However, in order to be able to take up CO 2 again after regeneration, the ion exchange resin must be cooled again. Therefore, each adsorber chamber is in the adsorption mode in one cycle, in the regeneration mode in the following cycle and in the cooling mode in the at least one subsequent cycle. Thereafter, the cycle in which the adsorber chamber is in the adsorption mode can be started again.The adsorber chambers communicate either with the enclosed volume or with an area outside the enclosed volume. This means that the adsorber chambers are flowed through either with air from the air conditioning chamber or with air from a region outside the air conditioning chamber.Advantageously, at least one CO 2- sensor is provided. This sensor may be disposed within the closed volume so that the controller may initiate a CO 2- reduction or a CO 2- enrichment based on the measured CO 2- content. The individual cycles can be carried out with the aid of stored values. However, a plurality of CO 2- sensors are required for true control.In a particularly simple embodiment of the invention, a rotary device is advantageously provided on which the adsorber chambers are fixedly mounted. In this way, all other components of the device can be installed in a fixed manner and are thus less sensitive to damage and errors.The adsorber chambers are mounted on the rotating device in such a way that they are all at the same distance from one another and are aligned identically to the axis of rotation of the rotating device. Therefore, the rotating device is rotated about its central axis after each cycle into a position offset by 120°, i.e. by the same angle after each cycle.In order to establish and also be able to change the connection between the adsorber chambers with the closed volume and with the region outside the closed volume, fixedly mounted air connections are provided, wherein in each position of the rotary device, two air connections are connected to each adsorber chamber. The air connections are provided above and below the rotating device, so that each adsorber chamber communicates with an air connection on its underside and with an air connection on its upper side. In the case of cylindrical adsorber chambers, the entire adsorption material contained therein can thereby be flowed through. The adsorber chambers are consequently successively inserted into the different streams-i.e. an adsorption stream, a regeneration stage and a cooling stream.In a further exemplary embodiment of the device according to the invention, a rotating device is dispensed with. Here, the adsorber chambers are not inserted into the different streams, but rather the streams are switched over in such a way that the fixedly mounted adsorber chambers are flowed through successively by the different streams. Two-way switchable valves and three-way switchable valves are provided for this purpose.Advantageously, the switchable valves are controlled by the controller such that flows from the switchable valves are conducted via lines from the closed volume and the region outside the closed volume into the adsorber chambers and from the adsorber chambers into the closed volume and the region outside the closed volume. This results in at least the same possibilities as in the embodiment with the rotating device. Since only valve flaps need to be moved here, the maintenance effort should be reduced.Particularly advantageously, a fan is provided in each case for suctioning and for blowing a flow out of or into the closed volume, and a fan is provided in each case for suctioning and for blowing a flow out of or into the region outside the closed volume. Particularly good flow conditions are thereby achieved.Further details and advantages of the invention are evident from the description of exemplary embodiments, which are explained in detail on the basis of the drawing.It shows: FIG. 1 shows a schematic view of a first exemplary embodiment of the device according to the invention, FIG. 2 shows a connection diagram of a first simple exemplary embodiment of the device according to FIG. 1, FIG. 3 shows a connection diagram of a second exemplary embodiment of the device according to FIG. 1, and FIG. 4 shows a connection diagram of a further exemplary embodiment of a device according to the invention.The device shown in FIG. 1 has an upper turntable 1 and a lower turntable 2. The two rotary plates are rigidly connected to one another via the identical adsorption cylinders 4. In this way, only one motor is required to drive the two turntables. Preferably, a stepping motor, not shown, is used for this purpose. The mounting is also not shown in FIG. 1 for reasons of clarity.Above the upper rotary plate 1 and below the lower rotary plate 2, three fastenings 3 for the air connections 5- 10 are provided in each case. These fastenings 3 are mounted on a machine frame, likewise not shown here. The lower fastenings for the lower air connections 5- 7 are not visible in the selected form of illustration. The control 81 is also fastened to the machine frame.An air connection is fitted into a through-opening of the fastenings 3. The two rotary plates 1 and 2 are likewise provided with through-openings above and below the adsorption cylinders. Seals are provided either on the turntables 1, 2 or on the attachments 3 in order to keep the air flow between the adsorption cylinders 4 and the air connections 5-10 in the paths provided for this purpose.Air lines or air hoses, not shown in FIG. 1, are connected to the air connections 5- 10. In the exemplary embodiment shown here, the air intake connection 5 is connected to an air conditioning chamber 80 (see FIGS. 2-4 ), from which air is suctioned out of the interior via a blower, not shown. The air intake port 6 communicates with the atmosphere 81 (see FIGS. 2-4 ), for example, the outside of the air conditioning chamber 80. The same applies to the air intake connection 10. The air exhaust connection 8 is in turn connected to the climate chamber 80 and returns the air extracted via the air intake connection 5. The air exhaust ports 8 and 11 are both connected to the atmosphere 81 and exhaust air to the outside.The adsorption cylinders 4 contain a material capable of adsorbing CO 2( carbon dioxide). As examples, activated carbon, zeolites or mesoporous silica may be mentioned here. Amines in solid form have proven to be particularly advantageous as ion exchange resin with reactive amine group, e.g. Purolite A110 or Lewatit VP OC 1065. However, even aqueous alkanolamine solutions are possible, but require a different construction of the adsorption cylinders.In the following Figs. 2-4, the adsorption cylinder which is just in the adsorption mode is denoted by the reference numeral 11, that in the regeneration mode by the reference numeral 12 and that in the cooling mode by the reference numeral 13. In FIG. 1, the adsorption cylinder is at the front left in the adsorption mode, that at the rear in the middle in the regeneration mode, and that at the front right in the cooling mode. When the absorption capacity of the adsorption cylinder at the front left is exhausted and the adsorption cylinder at the rear in the middle is regenerated, the rotary plates 1 and 2 rotate in the clockwise direction, so that the adsorption cylinder just cooled can then adsorb CO 2 and the adsorption cylinder with exhausted absorption capacity can now be regenerated. The adsorption cylinder just regenerated is now cooled in order to then be able to re-absorb CO 2.FIG. 2 shows the structure of the air duct of a simple embodiment of the device according to the invention. In the left branch, the adsorption section, air is conducted from the air conditioning chamber 80 via the air intake connection 5 into the adsorption cylinder in the adsorption mode 11. A CO 2- sensor 14 is also provided upstream of the air intake connection 5 in order to be able to check the CO 2- content of the air sucked in from the air conditioning chamber 80. In the adsorption cylinder in the adsorption mode, CO 2 is extracted from the air stream. The depleted air flow is then fed back to the climate chamber via the air blow-off connection 8.In the middle branch, the regeneration route, air is sucked in from the environment 81 via the air intake connection 6 and heated via the heater 15. This heated air is then passed through the adsorption cylinder in the regeneration mode 12. The previously adsorbed CO 2 is released there again by the hot air and is discharged again with the air flow via the air blow-off connection 9 into the environment 81.In the right branch, the cooling section, the adsorption cylinder heated by the air during the regeneration is cooled in order to be able to adsorb CO2 again in the next step. For this purpose, air is drawn in from the environment 81 via the air intake connection 10 and cooled in the cooling 16. This cooled air is supplied to the adsorption cylinder in the cooling mode 13. This air is then blown off again via the air blow-off connection 7 into the environment 81.In order to prevent the cooled ambient air from already releasing CO2to the adsorption cylinder again in the cooling mode and thus reducing the absorption capacity, it is also possible to use a closed circuit with an inert gas or depleted air for cooling the regenerated adsorption cylinder.Since three adsorption cylinders 4 are used in the apparatus described, the operation is also divided into three cycles. The above-described processes of adsorption, regeneration and cooling are carried out simultaneously in each cycle. The first cycle ends as soon as the absorption capacity of the adsorption cylinder in the adsorption mode 11 is exhausted. The heating 15 and the cooling 16 are to be designed such that the regeneration and the cooling are also already concluded at this point in time.After the end of the first cycle, the rotary plate arrangement 1, 2 is rotated clockwise by 120° and the second cycle is started. After the end of the second cycle, the turntables 1, 2 are rotated further in the clockwise direction again, so that the third cycle can be started. Once this has also ended, after a further 120° rotation, the adsorption cylinders 4 are again in the starting position and the first cycle can be started again.With the embodiment described here, it is only possible to reduce the CO 2- content of the air in the climate chamber 80 but not to increase it.In order to be able to increase the CO 2- content, an embodiment of the device according to the invention must be used, as shown in FIGS. 3 and 4.The structure of the device in FIG. 3 is very similar to the structure of FIG. 2, while the right branch, i.e. the cooling section, is constructed identically, two additional two-way valves 17, 18 and 20, 21 are provided in each of the middle and left branches. Such two-way valves usually have a valve flap 19 which is brought electromagnetically or with a stepping motor from a first end position into a second end position.When the valves 19 are in the position indicated by the reference lines, the device operates in the same way as the device according to FIG. 2, but in this embodiment the regeneration is carried out in countercurrent. During the adsorption, the air flow is guided from bottom to top as in the device according to FIG. 2. During the regeneration in the middle branch, on the other hand, the air flow is conducted from top to bottom. In each of the left and middle branch, a CO 2- sensor 14a and 14b is provided.If it is now established via the CO 2- sensor 14a that the CO 2- content of the air in the climate chamber 80 is too low, the CO 2- content in the climate chamber 80 must be increased.This means that CO 2 must now be extracted from the air from the environment 81 in order to be able to enrich the air in the climate chamber 80.For this purpose, the two-way valves 17, 18, 20, 21 are controlled in such a way that the valve flap 19 is in each case in the position shown by dashed lines. As a result, air now flows from the environment 81 via the two-way valve 17 and the air intake connection 5 into the adsorption cylinder in the adsorption mode 11, and CO 2 is extracted from the air there and stored in the adsorption cylinder. The depleted air is then returned to the environment 81 via the air blow-off connection 8 and the two-way valve 18.In the middle branch, in this exemplary embodiment, the air is now extracted from the climate chamber 80 and fed to the heater 15 via the CO 2- sensor 14 band the two-way valve 20. The air heated there now flows through the adsorption cylinder in the regeneration mode from top to bottom and is enriched there with CO 2. The air thus enriched then flows via the two-way valve 21 and the air connection 6 back into the air conditioning chamber.Ideally, both in the left and the middle branch, a separate CO 2- sensor is provided in each case before and after the adsorption cylinder. A further CO 2- sensor can be mounted directly in the climate chamber. Only in this way true control is possible, since it is possible to measure directly when the adsorption cylinder in the adsorption mode 11 has reached its absorption capacity and when the adsorption cylinder in the regeneration mode is completely regenerated. However, it is also possible to operate the device in a time-controlled manner and to store measured fixed values for the adsorption and the regeneration.FIG. 4 shows an exemplary embodiment in which no rotary plates 1, 2 are required and the adsorption cylinders can be mounted in a fixed manner as desired. For this purpose, four two-way valves 22-25, seven three-way valves 26-32 and nine air flow passages 33-41 are provided. The function of the device according to the invention will be described in detail below.Via a CO 2- sensor, not shown here, in the air conditioning chamber 80, it is determined that the CO 2- content in the air conditioning chamber 80 is too high. Consequently, a first cycle for CO 2- reduction is initiated. Air is therefore extracted from the climate chamber 80 and fed via the CO 2- sensor 14 to the two-way valve 22. This is switched so that the air flow via the line 52 reaches the two-way valve 28. Here, only the line 54 is opened, via which the air flow arrives in the merging 33. From there, it goes via line 51, junction 36, line 62, junction 39 and line 65 into the adsorption cylinder 4a which is in the adsorption mode in this cycle. The depleted air flow reaches the two-way valve 23 downstream of the adsorption cylinder 4a. The merging 31 is achieved via the opened line 72. The air flow is fed again to the air conditioning chamber 80 via a second CO 2- sensor 78.At the same time, the adsorption cylinder 4 bis regenerated. For this purpose, air is extracted from the environment 81 and fed to the three-way valve 27. This is set during this first cycle so that lines 46 and 47 are open and only line 43 is closed. The partial stream responsible for the regeneration is conducted via the line 46 to the heating 15. The heated air is then directed to the three-way valve 30, from where it reaches the junction 40 via the single open line 66. With the hot air, the adsorption cylinder 4 b, which is in the regeneration mode in this cycle, is now regenerated. The enriched air is passed via the two-way valve 24 and the line 75 to the junction 32. The air is blown off again into the environment 81 via the CO 2- sensor 79.Also simultaneously, the adsorption cylinder 4c is cooled so that it can resume CO 2 in the next cycle. The second partial flow from the three-way valve 27 is responsible for this purpose, which flow reaches the cooling system 16 via the line 47. From there, the cooled air is supplied via the conduit 50, the three-way valve 29 and via its single open conduit 60 to the junction 38 and from there via the conduit 64, the junction 41 and the conduit 71 to the adsorption cylinder 4c. After cooling this adsorption cylinder 4c, the air flow is blown off again into the environment 81 via the two-way valve 25, the line 76, the merging 32 and the CO 2- sensor 79.When very different values are no longer measured by the CO 2- sensors 14 and 78, the absorption capacity of the adsorption cylinder 4a is exhausted. The second cycle must now be initiated. This means that the adsorption cylinder 4 amust now be regenerated and the already regenerated adsorption cylinder 4 bmust be cooled. The already cooled adsorption cylinder 4 cmay now be operated in the adsorption mode.In the second cycle, the air from the air conditioning chamber 80 must consequently be conducted via the adsorption cylinder 4c. Thus, the path of the air flow from the air conditioning chamber 80 is guided to the adsorption cylinder 4c via the CO 2- sensor 14, the two-way valve 22, the conduit 52, the three-way valve 28, the conduit 59, the junction 35, the conduit 57, the junction 38, the conduit 64, the junction 41, and the conduit 71. From there, the depleted air takes the path back into the climate chamber 80 via the two-way valve 25, the line 76, the merging 31 and the CO 2- sensor 78.In this second cycle, the adsorption cylinder 4a must be regenerated. For this purpose, air from the environment 81 and the line 42 are supplied to the three-way valve 27. There, a partial stream is again branched off to the heating 15 via the line 46. From there, the path of the heated air passes via the conduit 68, the three-way valve 30, the conduit 67, the merging 39 and the conduit 65 to the adsorption cylinder 4a. From there, the enriched air takes the path back to the environment via the two-way valve 23, the line 73, the merging 32 and the CO 2- sensor 79.Likewise, in this second cycle, the adsorption cylinder 4 bmust be cooled. For this purpose, the second partial flow from the environment 81 is again used at the three-way valve 27. This partial flow passes through the conduit 47 to the cooling 16, and the cooled air is supplied through the conduit 50, the three-way valve 29, the conduit 61, the merging 37, the conduit 63, the merging 40 and the conduit 70 to the adsorption cylinder 4b. Thereafter, the cooling air flow reaches the environment 81 again via the two-way valve 24, the line 25, the merging 32 and the CO 2- sensor 79.If it is now established again via the difference of the values measured by the CO 2- sensors 14 and 78 that the absorption capacity of the adsorption cylinder 4 cis reached, the third cycle must be initiated. In this last cycle, the adsorption cylinder 4b just cooled acts in the adsorption mode. Adsorption cylinder 4a is in the cooling mode and adsorption cylinder 4c is in the regeneration mode.For reasons of clarity, the path of the air streams will be listed only schematically below. <row><cell>Adsorption:< / cell><cell>Climate chamber 80→CO <hi rend="subscript">2< / hi>- sensor 14→ Zwei valve 22→Lei-< / cell>< / row><row><cell / ><cell / ><cell>Air conditioning chamber 80 is provided with a three-way valve 28→line 55→coming 34→line 56→coming 37→line 63→coming 40→line 70→adsorber cylinder 4 b→line 70→ two-way valve 24→line 74→coming 31→CO <hi rend="subscript">2< / hi>- sensor 78→ air conditioning chamber< / cell>< / row><row><cell>Regeneration:< / cell><cell>Environment 81 → Line 42 → Three-way valve 27 → Lei< / cell>< / row><row><cell>Tubing 46 → heater 15 → conduit 68 → three-way valve 30 → conduit 69 → junction 41 → conduit 71 → adsorption cylinder 4c → two-way valve 25 → conduit 77 → junction 32 → CO <hi rend="subscript">2< / hi>- sensor 79 → environment 81< / cell>< / row><row><cell>Cooling: Cooling:< / cell><cell>Environment 81→Line 46→ Dreiwege valve 27→Line 47→< / cell>< / row><row><cell / ><cell / ><cell>Cooling 16→Line 50→ Dreiwege valve 29→Line 58→ Zusammen 36→ 39→Line 65→ Adsorptions cylinder 4 a→ Zwei valve 23→Line 73→ 32→CO2sensor 79→ Umgebung 81< / cell>< / row><p xml:id="_c03ec50139" n="0053">After these three cycles, the first cycle is continued again. The adsorption of CO <hi rend="subscript">2< / hi> from the climate chamber 80 is continued until the desired value is reached.<p xml:id="_c03ec50141" n="0054">However, it can also occur that too little CO <hi rend="subscript">2< / hi> is present in the atmosphere of the climate chamber 80. The device according to the invention must in this case adsorb CO <hi rend="subscript">2< / hi> from the air from the environment 81 and deliver it to the air of the climate chamber. This process also works in three cycles. During each of these cycles, an air flow from the environment 81 is directed over the adsorption cylinder which is currently in the adsorption mode, while the air from the climate chamber 80 is directed over the adsorption cylinder which is currently in the regeneration mode. If this results in a temperature increase in the air conditioning chamber, which cannot be compensated for otherwise, the air flow must pass through yet another cooling before being returned to the air conditioning chamber 80.<p xml:id="_c03ec50144" n="0055">The completion of a cycle is determined here by a comparison of the measurement value of the CO <hi rend="subscript">2< / hi>- sensor 79 with a standard value. It is assumed here that the CO <hi rend="subscript">2< / hi>- concentration in the air of the environment hardly changes. If too large fluctuations occur, an additional CO <hi rend="subscript">2< / hi>- sensor can be set directly upstream of the three-way valve 27.<p xml:id="_c03ec50148" n="0056">In the schematic list, the three cycles can be represented as follows: Cycle 1:<title desc="title">Cycle 1:Adsorption:Environment 81 → Line 42 → Three-way valve 27 → Line 43 -Three-way valve 26 → conduit 44 → junction 33→ Line 51 → Merge 36 → Line 62 → FeedJunction 39 → Line 65 → Adsorption Cylinder 4a→ Two-way valve 23 → Conduit 73 → Junction32→CO 2- sensor 79→ UmgebungRegeneration: Regeneration:Climate chamber 80→CO 2- sensor 14→ Zwei valve 22→Lei-Winding 53→ Heizung 15→ Leitung 68→ Dreiwege valve 30→ Line 66 → Junction 40 → Line 70 → Adsorption cylinder 4b → Two-way valve 24 → Line 74 → Junction 31 → CO 2- Sensor 78 → Climate chamber 80Cooling: Cooling:Environment 81→Line 42→ Dreiwege valve 27→Line 47→Cooling 16 → Pipe 50 → Three-way valve 29 → Pipe 60 → Junction 38 → Pipe 64 → Junction 41 → Pipe 71 → Adsorption cylinder 4c → Two-way valve 25 → Pipe 77 → Junction 32 → CO 2- Sensor 79 → AtmosphereCycle 2:Cycle 2:Adsorption:Environment 81→Line 42→ Dreiwege valve 27→Line 43→Three-way valve 26 → conduit 48 → junction 35 → conduit 57 → junction 38 → conduit 64 → junction 41 → conduit 71 → adsorption cylinder 4c → two-way valve 25 → conduit 77 → junction 32 → CO 2- sensor 79 → environment 81Regeneration: Regeneration:Climate chamber 80→CO 2- sensor 14→ Zwei valve 22→Lei-Air passage 53 → heater 15 → conduit 68 → three-way valve 30 → conduit 67 → junction 39 → conduit 65 → adsorption cylinder 4a → two-way valve 23 → conduit 72 → junction 31 → CO 2- sensor 78 → air conditioning chamber 80Cooling: Cooling:Environment 81→Line 42→ Dreiwege valve 27→Line 47→Cooling 16→Line 50→ Dreiwege valve 29→Line 61→ Zusammen 37→Line 63→ 40→Line 70→ Adsorptions cylinder 4 b→ Zwei valve 24→Line 75→ 32→CO 2- Sensor 79→ Umgebung 81Cycle 3: Cycle 3:Cycle 3: Cycle 3:Adsorption:Environment 81→Line 42→ Dreiwege valve 27→Line 43→Three-way valve 26 → conduit 45 → junction 34 → conduit 56 → junction 37 → conduit 63 → junction 40 → conduit 70 → adsorption cylinder 4b → two-way valve 24 → conduit 75 → junction 32 → CO 2- sensor 79 → environment 81Regeneration: Regeneration:Climate chamber 89→CO 2- sensor 14→ Zwei valve 22→Lei-Air passage 46 → heater 15 → conduit 68 → three-way valve 30 → conduit 69 → junction 41 → conduit 71 → adsorption cylinder 4c → two-way valve 25 → conduit 76 → junction 31 → CO 2- sensor 78 → air conditioning chamber 80CoolingEnvironment 81→Line 46→ Dreiwege valve 27→Line 47→Cooling 16→Line 50→ Dreiwege valve 29→Line 58→ Zusammen 36→ 39→Line 65→ Adsorptions cylinder 4 a→ Zwei valve 23→Line 73→ 32→CO 2- Sensor 79→ Umgebung 81In order to be able to ensure a flow through the device according to the invention without problems, a fan should be provided in each case at the intake point for the air from the climate chamber 80, at the intake point for the air from the environment 81, at the injection point into the climate chamber 80 and at the exhaust point into the environment 81.List of reference numbers:1 Upper turntable 2 Lower turntable 3 Fastening for air connections 4 Adsorption cylinder 5 Air intake connection with connection to the air conditioning chamber 6 Air intake connection with connection to the ambient air 7 Air exhaust connection with connection to the ambient air 8 Air exhaust connection with connection to the air conditioning chamber 9 Air exhaust connection with connection to the ambient air 10 Air intake connection with connection to the ambient air 11 Adsorption cylinder in the adsorption mode 12 Adsorption cylinder in the regeneration mode 13 Adsorption cylinder in the cooling mode 14 CO 2- sensor 15 Heater 16 Cooling 17 First two-way valve 18 Second two-way valve 19 Valve flap 20 Third two-way valve 21 Fourth two-way valve 22-25 Two-way valves 26-32 Three-way valves 33-41 Connections 42-77 Lines 78 Second CO 2- Sensor 79 Third CO 2- Sensor 80 Climate chamber 81 Environment 82 Control

Claims

Device for controlling the CO 2- content of a closed volume (80), having at least three adsorber chambers (4) which are each filled with a regeneratable material which adsorbs CO 2 characterized in that a controller (82) is provided and the device is constructed in such a way that the controller (82) actuates at least three successive cycles and, in each of the at least three cycles, a first adsorber chamber is in an adsorption mode (11), a second adsorber chamber is in a regeneration mode (12) and at least one third adsorber chamber is in a cooling mode (13).Device according to Claim 1, characterized in that each adsorber chamber (4) is in the adsorption mode (11) in one cycle, in the regeneration mode (12) in the following cycle and in the cooling mode (13) in the at least one cycle following it.Device according to one of Claims 1 to 2, characterized in that the adsorber chambers (4) are connected either to the closed volume (80) or to a region (81) outside the closed volume (80).Device according to one of Claims 1 to 3, characterized in that at least one CO 2- sensor (14, 78, 79) is provided.Device according to one of Claims 1 to 4, characterized in that a rotary device (1, 2) is provided, on which the adsorber chambers (4) are fixedly mounted.Device according to one of Claims 1 to 5, characterized in that the rotation device is rotated about its central axis after each cycle into a position offset by 120°.Device according to one of Claims 1 to 6, characterized in that fixedly mounted air connections (5 to 10) are provided, wherein in each position of the rotary device (1, 2) two air connections (5 to 10) are connected in each case to each adsorber chamber (4).Device according to one of Claims 1 to 4, characterized in that two-way switchable valves (22 to 25) and three-way switchable valves (26 to 32) are provided.Device according to Claim 8, characterized in thatthe switchable valves (22 to 32) are controlled by the controller (82) in such a way that flows from the switchable valves (22 to 32) are conducted via lines (42 to 47) from the closed volume (80) and the region (81) outside the closed volume (80) into the adsorber chambers (4) and from the adsorber chambers (4) into the closed volume (80) and the region (81) outside the closed volume (80).Device according to one of Claims 8 to 9, characterized in that a fan for suctioning and blowing a flow from or into the closed volume (80) and a fan for suctioning and blowing a flow from or into the region (81) outside the closed volume (80) are provided in each case.

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