JP3908138B2 - Air-cooled absorber - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
[0002]
The present invention relates to an air-cooled absorber used in an air-cooled absorption refrigeration apparatus, and more particularly to an absorbent distribution structure in the air-cooled absorber.
[Prior art]
[0003]
Generally, in the case of an air-cooled absorber in an air-cooled absorption refrigeration system, the refrigerant vapor is absorbed into the absorption liquid in the absorption heat transfer tube, so that the inner wall of the absorption heat transfer tube is wet as uniformly as possible by the absorption liquid. This is extremely important for improving the absorption efficiency. In addition, in the case of an air-cooled absorber, there is a restriction that the number of absorption heat transfer tubes must be extremely large in consideration of heat dissipation of absorbed heat. Accordingly, not only improving the wettability of the inner wall of each absorption heat transfer tube, but also improving the absorption capability by making the wettability uniform between the absorption heat transfer tubes (that is, uniforming the amount of the supply absorption liquid). It becomes important in.
[0004]
In order to cope with the above requirements, the air-cooled absorber is provided with a solution distributor that evenly distributes the absorbing liquid to each absorption heat transfer tube. In this solution distributor, (1) The absorption liquid can be distributed and supplied to each absorption heat transfer tube evenly. (2) The manufacturing accuracy is difficult to vary and is not affected by the inclination. (3) It is resistant to fluctuations in the absorption liquid flow rate. , The requirement is required. In order to satisfy such requirements, the structure has to be complicated and expensive.
[0005]
Therefore, there is one that tries to cope with the above problem with a simple structure. For example, in the case of the air-cooled absorber disclosed in Patent Document 1, a cap made of an annular body is placed on the inlet portion of the absorption heat transfer tube, and between the absorption heat transfer tube and the cap from the inlet formed at the lower end portion of the cap. And a distribution structure for introducing the absorption liquid into the absorption heat transfer tube from the inlet formed in the inlet portion of the absorption heat transfer tube.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-246532 [Problems to be Solved by the Invention]
[0007]
However, in the case of the air cooling absorber distribution structure of the above-mentioned known example, since the cap is simply put on the inlet portion of the absorption heat transfer tube, the gap between the absorption heat transfer tube inlet portion and the cap (that is, the annular shape) Groove) and the inlet formed in the cap and the inlet relationship formed in the absorption heat transfer tube cannot be managed, causing the flow rate of the absorption liquid supplied to the absorption heat transfer tube to vary. It was.
[0008]
The present invention has been made in view of the above points. A predetermined liquid is provided in the vicinity of the liquid inlet so that a fixed gap can be maintained between the liquid inlet of the absorption heat transfer tube and the side surface of the solution distributor. The purpose is to be able to secure the head.
[Means for Solving the Problems]
[0009]
In the present invention, as a first means for solving the above-described problems, a large number of absorption heat transfer tubes 11, 11,... For absorbing refrigerant vapor in an absorption liquid flowing inside, and the absorption heat transfer tubes 11, 11 .. Air cooling provided with upper and lower headers 13 and 14 provided above and below, and a solution distributor 15 provided in the upper header 13 for evenly distributing the absorption liquid to the respective absorption heat transfer tubes 11. in the absorber, the solution distributor 15, constituted by a trough-shaped member and both ends having an opening 16 is closed to the the upper surface 15a inlet 11a of the absorption heat exchanger tube 11 is loosely fitted projecting, solution Curved surfaces 17 and 17 that are substantially concentric with the inlet portions 11a of the respective absorption heat transfer tubes 11 are formed on both side surfaces 15b and 15b of the distributor 15, and the respective absorption heat transfer tubes 11 and 17 are formed on the curved surfaces 17 and 17, respectively. A predetermined gap S, S is maintained between In order to form the projections 19 and 19 formed by dimple processing, the curved surfaces 17 and 17 are recessed from the outside, respectively, while the opening 16 of the solution distributor 15 is orthogonal to the side surface 15b of the solution distributor 15. The rims 16a, 16a are brought into contact with the outer periphery of the inlet portion 11a of the absorption heat transfer tube 11, and the absorption liquid is placed in positions not corresponding to the absorption heat transfer tubes 11 on both side surfaces 15b, 15b of the solution distributor. only set the liquid flow inlet 20, 20 to flow into the said the inlet portion 11a of the absorber heat transfer tube 11, forming a liquid inlet port 21 for introducing the absorbing liquid is positioned below the projection 19 into the interior is doing.
[0010]
With the configuration described above, the absorption liquid supplied into the upper header 13 flows into the solution distributor 15 from the liquid inlet 20, and the inlet 11 a of each absorption heat transfer tube 11 and the solution distributor 15. It will be introduced into the absorption heat transfer tube 11 from the liquid inlet 21 through the gaps S, S formed between the both side surfaces 15b, 15b, but the inlet portion 11a of each absorption heat transfer tube 11 and the solution distribution Since the gaps S, S formed between the side surfaces 15b, 15b of the vessel 15 are ensured by the projections 19, 19, a predetermined liquid head is provided near the liquid inlet 21 of each absorption heat transfer tube 11. Is always secured. Therefore, the flow rate of the absorption liquid introduced into each absorption heat transfer tube 11 is less likely to vary, and the absorption liquid cannot be evenly distributed due to fluctuations in the flow rate of the absorption liquid and the inclination of the entire apparatus. Also disappear.
[0011]
Further, since the opening edges 16a and 16a of the solution distributor 15 and the inlet portion 11a of the absorption heat transfer tube 11 are brought into contact with each other, the positioning of the solution distributor 15 can be reliably performed.
[0012]
In addition, by forming curved surfaces 17 and 17 that are substantially concentric with the inlet portions 11a of the respective absorption heat transfer tubes 11 on both side surfaces 15b and 15b of the solution distributor 15, the inlet portions 11a of the respective absorption heat transfer tubes 11 and The gaps S, S formed between both side surfaces 15b, 15b of the solution distributor 15 are substantially concentric circles, which is optimal for forming a liquid head.
[0013]
Further, the projections 19 and 19 for maintaining the distance can be formed only by performing dimple processing on the curved surfaces 17 and 17, and the cost can be reduced.
[0014]
In the present invention, as a second means for solving the above-described problem, in the air-cooled absorber provided with the first means, a plurality of heat transfer tubes arranged in a straight line with the absorption heat transfer tubes 11, 11. And the solution distributor 15 is integrally formed in one row so as to correspond to the absorption heat transfer tubes 11, 11... Constituting each heat transfer tube row X, and The liquid inlets 20, 20... Can be formed at predetermined intervals in the longitudinal direction, and when configured in this way, one solution distributor 15 is attached to one heat transfer tube row X. As a result, the assembly workability is greatly improved and the cost is reduced.
[0015]
In the present invention, as a third means for solving the above-described problem, in the air-cooled absorber provided with the second means, a plurality of the solution distributors 15 are provided, and the absorbent is applied to the upper header 13. The absorption liquid supply pipe 22 to be supplied can also face the space V between the solution distributors 15 and 15, and in such a case, the absorption liquid is supplied to the space V formed between the solution distributors 15 and 15. The absorbing liquid supplied from the pipe 22 stays in the space V, and then is distributed and introduced into the solution distributor 15 from the liquid inlets 20, 20,..., And the space V is used as a solution distribution header. This eliminates the need for a solution distribution header, which has been necessary in the past, and contributes to cost reduction.
DETAILED DESCRIPTION OF THE INVENTION
[0016]
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
[0017]
The air-cooled absorber according to the present embodiment is used in the air-cooled absorption refrigeration apparatus shown in FIG.
[0018]
The air-cooled absorption refrigeration apparatus uses water as a refrigerant and lithium bromide as an absorption liquid, and includes one condenser C, one absorber A, one evaporator E, and two solution heat exchangers. H ₂ and H ₁ and the two regenerators G ₂ and G ₁ are operatively connected by a solution piping system and a refrigerant piping system to constitute a circulation cycle of the refrigerant and the absorbing solution. Reference numeral F denotes a cooling fan.
[0019]
The dilute solution La fed from the absorber A by the solution pump LP flows into the high temperature regenerator G ₂ through the low temperature solution heat exchanger H ₁ and the heated side of the high temperature solution heat exchanger H ₂ .
[0020]
The dilute solution La flowing into the high-temperature regenerator G ₂ is heated and concentrated by an external heat source (not shown) to be in a boiling state, and is separated into the high-temperature concentrated solution L ₂ and the refrigerant vapor R ₂ in the gas-liquid separator 1. The hot concentrated solution L ₂ flows into the low temperature regenerator G ₁ through the heating side of the hot solution heat exchanger H ₂ . At this time, in the high-temperature solution heat exchanger H ₂ , heat exchange is performed between the heated diluted solution La and the heated hot concentrated solution L ₂ (heat recovery), and the diluted solution La is preheated. flowing into the high-temperature regenerator G ₂ in the state.
[0021]
The high temperature concentrated solution L ₂ flowing into the low temperature regenerator G ₁ is heated and concentrated by the refrigerant vapor R ₂ flowing from the gas-liquid separator 1 side, flows out as the low temperature concentrated solution L _1, and the low temperature solution heat It flows into the air-cooled absorber A through the heating side of the exchanger H ₁ . At this time, in the low-temperature solution heat exchanger H ₁ , heat exchange is performed between the heated diluted solution La and the heated cold concentrated solution L ₁ (heat recovery), and the diluted solution La is preheated. It is sent to the high temperature solution heat exchanger H ₂ in the state.
[0022]
The refrigerant vapor R ₁ generated in the low temperature regenerator G _1, the gas-liquid separator refrigerant vapor R ₂ used in 1 flowing out and from the low temperature regenerator G ₁ as a heat source for heating and concentrating the hot concentrated solution L ₂ is The condensed refrigerant drain Dr joins and flows into the air-cooled condenser C, where it is cooled by blowing air from the fan F, is condensed and liquefied to become liquid refrigerant Rl, and flows into the evaporator E. In the evaporator E, the liquid refrigerant Rl evaporates by heat exchange with the secondary heat medium Y to become refrigerant vapor Re and flows into the air-cooled absorber A.
[0023]
In the air-cooled absorber A, the refrigerant vapor Re is absorbed into the low-temperature concentrated solution L ₁ flowing from the low-temperature regenerator G _1, and the low-temperature concentrated solution L ₁ is diluted to become a diluted solution La. The absorbed heat generated at this time is cooled by the air blown from the fan F.
[0024]
The air-cooled absorber A includes a large number of vertical absorption heat transfer tubes 11, 11... That allow the refrigerant vapor R ₁ to be absorbed by the absorption liquid (that is, the low-temperature concentrated solution L ₁ ) flowing inside, and the absorption heat transfer tubes 11, It is composed of a large number of plate-like fins 12, 12,. In the present embodiment, the evaporator E and the upper header 13 of the air-cooled absorber A are integrated, but the evaporator E and the upper header 13 may be configured separately. Reference numeral 14 denotes a lower header of the air-cooled absorber A.
[0025]
First Embodiment FIGS. 2 to 6 show an air-cooled absorber according to a first embodiment of the present invention.
[0026]
In the upper header 13 of the air-cooled absorber A, as shown in FIGS. 2, 3, and 4, a solution that evenly distributes the absorbing liquid (that is, the low-temperature concentrated solution) L ₁ to the absorbing heat transfer tubes 11. A distributor 15 is provided.
[0027]
In this air-cooled absorber, the absorption heat transfer tubes 11, 11,... Are composed of a plurality of rows (in this embodiment, two rows) of heat transfer tubes X, X arranged in a straight line, and the solution distributor The unit 15 is integrally formed in one row so as to correspond to the absorption heat transfer tubes 11, 11... Constituting each heat transfer tube row X. If it does in this way, it will be able to respond | correspond to the heat exchanger tube row | line | column X for 1 row | line | column by mounting | wearing with one solution distributor 15, and it will contribute also to cost reduction while the assembly workability | operativity improves significantly.
[0028]
The solution distributor 15 is manufactured by punching and bending a thin metal plate, and the inlet portions 11a, 11a,... Of the absorption heat transfer tubes 11, 11,. It has an opening 16, 16 which is, and a trough-shaped member having both ends closed.
[0029]
On both side surfaces 15b, 15b of the solution distributor 15, curved surfaces 17, 17 substantially concentric with the absorption heat transfer tube 11 are formed. A portion of the side surface 15 b of the solution distributor 15 where the curved surface 17 is not formed is a flat plate portion 18.
[0030]
Protrusions 19 and 19 are formed at the center of the inner surfaces of the curved surfaces 17 and 17 to hold substantially concentric gaps S and S having a predetermined width between the heat transfer tubes 11. In the present embodiment, each of the protrusions 19 is formed by dimple processing for recessing the curved surface 17 from the outside. If it does in this way, the protrusion 19 can be formed only by performing a dimple process, and cost reduction can be aimed at.
[0031]
Moreover, the inlet part 11a of each said absorption heat exchanger tube 11 is made to protrude above the upper surface 15a in the said solution distributor 15 (refer FIG. 4 and FIG. 6). In each opening 16, the edges 16 a and 16 a parallel to the side surface 15 b of the solution distributor 15 are brought into contact with the outer periphery of the inlet portion 11 a of the absorption heat transfer tube 11. In this way, the solution distributor 15 can be positioned more reliably.
[0032]
Further, the two side surfaces 15b and 15b of the solution distributor 15 do not absorb near the lower ends of the positions not corresponding to the respective absorption heat transfer tubes 11 (that is, the flat plate portions 18 and 18 where the curved surface 17 is not formed). liquid inlet 20, 20 of the small pore geometry for flowing liquid L ₁ therein is provided at a predetermined interval in the longitudinal direction. Furthermore, the absorbing liquid L ₁ is introduced into the lower portion of the inlet portion 11 a of each of the absorption heat transfer tubes 11 (that is, a position above the bottom surface 13 a of the upper header 13) below the protruding portion 19. A small hole-shaped liquid inlet 21 is formed. In the present embodiment, the liquid inlet 20 and the liquid inlet 21 are small holes, but may have any shape as long as the absorbing liquid L ₁ flows in a small amount.
[0033]
By the way, in this embodiment, the solution distributors 15 and 15 are arranged in two rows, and the absorption liquid supply pipe 22 that supplies the absorption liquid L ₁ to the upper header 13 is provided between the solution distributors 15 and 15. It faces the central portion in the longitudinal direction in the space V (see FIG. 2). In this way, the absorption liquid L ₁ supplied from the absorption liquid supply pipe 22 to the space V formed between the solution distributors 15 and 15 stays in the space V, and then the liquid inlets 20, 20. From the inside of the solution distributor 15. Therefore, the space V can be used as a solution distribution header, and a header for solution equal distribution that has been required in the past is unnecessary, which contributes to cost reduction.
[0034]
With the above configuration, the absorbing liquid L ₁ supplied into the upper header 13 flows into the solution distributor 15 from the liquid inlets 20, 20..., And the inlet portions 11 a of the respective absorption heat transfer tubes 11. And the gaps S and S formed between the liquid distributor 15 and the side surfaces 15b and 15b of the solution distributor 15 are introduced into the respective absorption heat transfer tubes 11 from the liquid inlet 21. At this time, since the gaps S and S formed between the inlet portion 11a of each absorption heat transfer tube 11 and the side surfaces 15b and 15b of the solution distributor 15 are ensured by the protrusions 19 and 19, each absorption. A predetermined liquid head is always secured in the vicinity of the liquid inlet 21 of the heat transfer tube 11. Accordingly, the flow rate of the absorbing liquid L ₁ introduced into each absorption heat transfer tube 11 is less likely to vary, and the absorbing liquid L ₁ is evenly distributed by being affected by fluctuations in the flow rate of the absorbing liquid L ₁ and the inclination of the entire apparatus. It will not be impossible.
[0035]
Moreover, since the curved surfaces 17 and 17 that are substantially concentric with the respective absorption heat transfer tubes 11 are formed on both side surfaces 15b and 15b of the solution distributor 15, the inlet portions 11a of the respective absorption heat transfer tubes 11 and The gaps S, S formed between the side surfaces 15b, 15b of the solution distributor 15 have a substantially concentric circular shape, which is optimal for forming the liquid head.
[0036]
Second Embodiment FIG. 8 shows a solution distributor in an air-cooled absorber according to a second embodiment of the present invention.
[0037]
In this case, the solution distributor 15 is loosely fitted individually to the inlet portion 11a of each absorption heat transfer tube 11, and includes one opening 16, a pair of curved surfaces 17, 17 and a pair of protrusions 19, ends having a 19 and one liquid inlet 20 is constituted by a gutter-like member which is closed. In this case, it is necessary to loosely fit the solution distributors 15 to the inlet portions 11a of the respective absorption heat transfer tubes 11. Since other configurations and operational effects are the same as those in the first embodiment, description thereof will be omitted.
【The invention's effect】
[0038]
According to the first means of the present invention, a large number of vertical absorption heat transfer tubes 11, 11... For absorbing the refrigerant vapor in the absorption liquid flowing inside, and above and below the absorption heat transfer tubes 11, 11. In the air-cooled absorber, the upper and lower headers 13 and 14 and the solution distributor 15 that is disposed in the upper header 13 and distributes the absorbing liquid evenly to the respective absorption heat transfer tubes 11 are provided. the distributor 15, constituted by a trough-shaped member and both ends having an opening 16 is closed to the the upper surface 15a inlet 11a of the absorption heat exchanger tube 11 is loosely fitted projecting, both sides of the solution distributor 15 15b, 15b are formed with curved surfaces 17, 17 that are substantially concentric with the inlet portion 11a of each absorption heat transfer tube 11, and a predetermined gap is formed between the curved surfaces 17, 17 and each absorption heat transfer tube 11. The curved surfaces 17, 17 to hold S, S Protrusions 19 and 19 formed by dimple processing which are recessed from the outside are formed, respectively, while the edges 16a and 16a orthogonal to the side surface 15b of the solution distributor 15 at the opening 16 of the solution distributor 15 are absorbed. The liquid inlets 20 and 20 are made to contact the outer periphery of the inlet portion 11a of the heat transfer tube 11 and allow the absorption liquid to flow into the solution distributor side surfaces 15b and 15b at positions not corresponding to the respective absorption heat transfer tubes 11. the setting only, the inlet portion 11a of the respective absorbing heat transfer tube 11, to form a liquid inlet port 21 for introducing into the interior of the absorption liquid is positioned below the projections 19, 19, supplied to the upper header 13 The absorbed liquid flows into the solution distributor 15 from the liquid inlet 20, and a gap is formed between the inlet portion 11a of each absorption heat transfer tube 11 and both side surfaces 15b, 15b of the solution distributor 15. , S is introduced into the absorption heat transfer tube 11 from the liquid inlet 21, so that it is formed between the inlet portion 11 a of each absorption heat transfer tube 11 and both side surfaces 15 b, 15 b of the solution distributor 15. Since the gaps S, S are secured by the protrusions 19, 19, a predetermined liquid head is always secured in the vicinity of the liquid inlet 21 of each absorption heat transfer tube 11. As a result, there is less variation in the flow rate of the absorption liquid introduced into the liquid, and there is no effect that the absorption liquid cannot be evenly distributed due to fluctuations in the flow rate of the absorption liquid or the inclination of the entire apparatus.
[0039]
In addition, since the opening edges 16a and 16a of the solution distributor 15 and the inlet portion 11a of the absorption heat transfer tube 11 are brought into contact with each other, there is an effect that the positioning of the solution distributor 15 can be performed reliably.
[0040]
In addition, by forming curved surfaces 17 and 17 that are substantially concentric with the inlet portions 11a of the respective absorption heat transfer tubes 11 on both side surfaces 15b and 15b of the solution distributor 15, the inlet portions 11a of the respective absorption heat transfer tubes 11 and The gaps S, S formed between the both side surfaces 15b, 15b of the solution distributor 15 are substantially concentric and have the effect of being optimal for liquid head formation.
[0041]
In addition, the projections 19 and 19 for maintaining the distance can be formed simply by performing dimple processing on the curved surfaces 17 and 17, and the cost can be reduced.
[0042]
As in the second means of the present invention, in the air-cooled absorber provided with the first means, the absorption heat transfer tubes 11, 11,... Are configured by a plurality of heat transfer tube rows X, X,. In addition, the solution distributor 15 is integrally formed in one row so as to correspond to the absorption heat transfer tubes 11, 11,... Constituting each heat transfer tube row X, and the liquid inlets 20, 20,. Can be formed at a predetermined interval in the longitudinal direction. In such a configuration, one solution distributor 15 can be attached to correspond to one heat transfer tube row X, and assembly workability can be achieved. Will greatly improve and contribute to cost reduction.
[0043]
As in the third means of the present invention, in the air-cooled absorber provided with the second means, a plurality of the solution distributors 15 are provided and an absorbing liquid supply pipe 22 for supplying the absorbing liquid to the upper header 13 is provided. It is possible to face the space V between the solution distributors 15 and 15, and in such a case, the absorption liquid supplied from the absorption liquid supply pipe 22 to the space V formed between the solution distributors 15 and 15. Is retained in the space V and then distributed and introduced into the solution distributor 15 from the liquid inlets 20, 20,..., And the space V can be used as a solution distribution header, which is conventionally required. In addition, a header for uniform solution distribution is not required, which contributes to cost reduction.
[Brief description of the drawings]
FIG. 1 is an operation cycle flow diagram of an air-cooled absorption refrigeration apparatus using an air-cooled absorber according to an embodiment of the present invention.
FIG. 2 is a cross-sectional plan view of the air-cooled absorber according to the first embodiment of the present invention.
FIG. 3 is a cross-sectional view taken along the line III-III in FIG.
4 is an enlarged sectional view taken along the line IV-IV in FIG. 2;
FIG. 5 is an enlarged plan view of a main part of the solution distributor in the air-cooled absorber according to the first embodiment of the present invention.
6 is a cross-sectional view taken along line VI-VI in FIG.
FIG. 7 is an enlarged perspective view of a main part of the solution distributor in the air-cooled absorber according to the first embodiment of the present invention.
FIG. 8 is an enlarged perspective view of a solution distributor in an air-cooled absorber according to a second embodiment of the present invention.
[Explanation of symbols]
11 is an absorption heat transfer tube, 11a is an inlet portion, 12 is a plate fin, 13 is an upper header, 14 is a lower header, 15 is a solution distributor, 15a is an upper surface, 15b is a side surface, 16 is an opening, 16a is a lip, 17 is a curved surface, 19 is a protrusion, 20 is a liquid inlet, 21 is a liquid inlet, 22 is a solution supply pipe, A is an air-cooled absorber, S is a gap, X is a heat transfer tube row, and V is a space.

Claims (3)

Numerous vertical absorption heat transfer tubes (11), (11), which absorb the refrigerant vapor into the absorption liquid flowing inside, and upper portions provided above and below the absorption heat transfer tubes (11), (11),. And a lower header (13), (14), and a solution distributor (15) disposed in the upper header (13) for evenly distributing the absorption liquid to the respective absorption heat transfer tubes (11). An air-cooled absorber, wherein the solution distributor (15) has an opening (16) in which an inlet portion (11a) of each absorption heat transfer tube (11) is loosely protruded on an upper surface (15a) and both ends. There constituted by gutter-shaped member which is closed, both sides of the solution distributor (15) (15b), the inlet portion (11a) substantially concentric in the (15b), wherein each absorber heat transfer tube (11) The curved surfaces (17) and (17) are formed, and the curved surfaces (17) and (17) Projections (19) formed by dimple processing for recessing the curved surfaces (17), (17) from the outside in order to maintain predetermined gaps (S), (S) between the heat transfer tubes (11). , (19) while the edges (16a), (16a) perpendicular to the side surface (15b) of the solution distributor (15) at the opening (16) of the solution distributor (15) An absorptive liquid is brought into contact with the outer periphery of the inlet portion (11a) of the heat transfer tube (11) and at a position not corresponding to each of the absorption heat transfer tubes (11) on both side surfaces (15b) and (15b) of the solution distributor. liquid inlet for flowing the inside (20), (20) set only, said the inlet portion of the absorption heat transfer tube (11) (11a), said projection (19), located below (19) And forming the liquid inlet (21) for introducing the absorbing liquid into the interior Air-cooled absorber characterized.   The absorption heat transfer tubes (11), (11),... Are configured with a plurality of heat transfer tube rows (X), (X),... And the solution distributor (15) is connected to each heat transfer tube. One row is integrally formed to correspond to the absorption heat transfer tubes (11), (11),... Constituting the row (X), and the liquid inlets (20), (20),. The air-cooled absorber according to claim 1, wherein the air-cooled absorber is formed at a predetermined interval.   A plurality of rows of the solution distributors (15) are provided and an absorption liquid supply pipe (22) for supplying an absorption liquid to the upper header (13) is provided in a space (V) between the solution distributors (15) and (15). The air-cooled absorber according to claim 2, wherein the air-cooled absorber is exposed.

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