JP3216567B2 - Air-cooled absorption refrigeration system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-cooled absorption refrigeration system in which heat absorbed in an absorber is cooled and radiated by an air flow. 2. Description of the Related Art In general, in an absorber of an absorption refrigeration system, it is necessary to remove not only the absorption of refrigerant vapor but also the absorption heat of an absorption liquid generated by the absorption. Therefore, in general, a water-cooled or air-cooled absorber cooling means is provided.However, although a water-cooled cooling means is provided, the cooling efficiency is high, but a system such as a cooling tower is required. There is a disadvantage that the size is increased and the cost is increased. Under such circumstances, various air-cooled absorber structures have recently been proposed. [0004] As specific examples thereof, see, for example,
As described in JP-A-84062, JP-B-7-21364, JP-B-7-21365, etc., the outer periphery of a straight absorption heat transfer tube in which an absorption liquid flows together with refrigerant vapor from above to below via a header portion. By providing a large number of radiating fins in the section, the absorber part is formed in a cross fin type heat exchanger structure, and a plurality of sets of these are arranged in parallel from the airflow upstream side of the blowing means such as a fan to the downstream There is an air-cooled absorption refrigeration system in which an air-cooled absorber is constituted by the air-cooling device, and the absorber itself is air-cooled by an air flow from a blowing means such as the fan. In this case, the plurality of sets of absorption heat transfer tubes are supplied with the same flow rate of the absorbing liquid evenly via the absorbing liquid distribution container. [0005] However, as described above, the same amount of the absorbing liquid is caused to flow evenly to each of the plural sets of absorption heat transfer tubes in each row from the air flow upstream to the air flow downstream. If so, there are the following problems. That is, the temperature of the air passing through each absorption heat transfer tube portion is lowest in the absorption heat transfer tube portion on the most upstream side of the air flow.
The heat is exchanged toward the downstream side, so that the temperature gradually increases. For this reason, the absorption heat transfer tubes of the plurality of rows necessarily have higher absorption capacity on the upstream side and have lower absorption capacity on the downstream side. Accordingly, in the case where the same flow rate of the absorbing liquid is supplied to each of the plurality of rows of the absorption heat transfer tubes arranged from the upstream side to the downstream side of the air flow as described above,
There is a problem that the large refrigerant vapor absorption capacity of the absorption heat transfer tube on the upstream side cannot be fully utilized. The present invention has been made in order to solve this problem. For each of a plurality of rows of absorption heat transfer tubes arranged from the upstream side to the downstream side of the airflow, an appropriate one corresponding to the absorption capacity is provided. By making it possible to adjust and set the absorption liquid flow rate, the absorption performance of the absorption heat transfer tube on the upstream side of the air flow is effectively and fully utilized to enhance the absorption performance as much as possible, and effectively improve the absorption performance of the absorber. It is an object of the present invention to provide an air-cooled absorption refrigeration apparatus that can be improved. [0009] In order to achieve the above object, the present invention is provided with the following means for solving the problems. (1) The invention of claim 1 That is, the invention of claim 1 of the present application provides an air-cooled absorber 4 composed of a plurality of rows of absorption heat transfer tubes 4a, 4b, 4c for absorbing refrigerant vapor into an absorbing liquid, A blowing means 20 for cooling the absorber 4 by an air flow; and the plurality of rows of absorption heat transfer tubes 4a, 4
b, 4c, an air-cooled absorption refrigeration system comprising flow rate adjusting means 18a, 18b, 23a, 23b, 23c for adjusting the flow rate of the absorbing liquid flowing through each of the flow rate adjusting means 18a, 18b, 23a, 23b, 23c is such that the flow rate of the absorption liquid is adjusted such that the upstream side of the air flow in the plurality of rows of the absorption heat transfer tubes 4a, 4b, 4c has a higher flow rate of the absorption liquid than the downstream side. It is characterized by. Therefore, with this configuration, it is possible to provide an appropriate absorption liquid supply flow rate in accordance with the absorption performance of each of the airflow upstream absorption heat transfer tube and the airflow downstream absorption heat transfer tube. Further, in this case, the flow rate adjusting means 18a, 18b, 23a, 23b, 23c are arranged such that the upstream one of the plurality of rows of the absorption heat transfer tubes 4a, 4b, 4c is the downstream one. The flow rate is adjusted so that the flow rate of the absorbing liquid is increased as compared with the above. Therefore, it is possible to adjust and set an appropriate flow rate of the absorbing liquid for each of the plurality of rows of absorption heat transfer tubes arranged from the upstream side to the downstream side of the air flow, so that the cooling air temperature is low and the absorption performance is high. On the upstream side of the airflow absorption heat transfer tube, a large amount of absorption liquid according to the large absorption performance can be flowed to effectively and sufficiently utilize the large absorption performance, while the temperature of the cooling air is high, The absorption efficiency is made as high as possible by flowing a small amount of the absorbing liquid through the absorption heat transfer tube on the downstream side of the air flow having a small absorption performance.
The two functions make it possible to improve the absorption efficiency and absorption performance of the absorption heat transfer tube as a whole. (2) The invention of claim 2 In the invention of claim 2 of the present invention, the flow rate adjusting means 18a, 18b of the invention of claim 1 is connected to the absorption liquid distribution sections 15a, 15b of the air-cooled absorber 4. The flow rate is adjusted by changing the diameter of the absorption liquid branch pipe. Accordingly, the flow rate of the absorbing liquid that is different between the upstream side and the downstream side of the air flow is fixedly adjusted and set, whereby the operation of the first aspect of the present invention is effectively realized. (3) According to the third aspect of the present invention, in the third aspect of the present invention, the flow rate adjusting means 23a, 23b, and 23c according to the first aspect of the present invention are arranged such that the absorption heat transfer tubes 4a , 4b, 4c, the flow rate is adjusted by changing the diameter of the absorption liquid inlet caps 22a, 22b, 22c. Accordingly, the flow rates of the absorbing liquid which are different between the upstream side and the downstream side of the air flow are fixedly adjusted and set, whereby the operation of the first aspect of the present invention is effectively realized. (4) In the fourth aspect of the present invention, in the fourth aspect of the present invention, the flow rate adjusting means 23a, 23b, and 23c of the first aspect of the present invention is configured such that the absorption heat transfer tubes 4a , 4b, 4c absorption liquid inlet caps 22a, 22b, 22c.
The flow rate is adjusted by changing the opening areas of a, 23b, and 23c. Accordingly, the flow rate of the absorbing liquid which is different between the upstream side and the downstream side of the air flow is fixedly adjusted and set, whereby the operation of the first aspect of the present invention is effectively realized. As described above, according to the air-cooled absorption refrigeration apparatus of the present invention, the absorption efficiency and the absorption performance as a whole of a plurality of rows of absorption heat transfer tubes can be improved more effectively than before. As a result, a compact, high-performance air-cooled absorption refrigeration apparatus can be provided. DETAILED _DESCRIPTION OF THE _INVENTION (Embodiment 1) Figures 1 and 2 show a configuration of an air-cooled absorption type refrigerating apparatus according to a first embodiment of the present invention. In this air-cooled absorption refrigeration apparatus, for example, an aqueous solution of lithium bromide (aqueous solution of LiBr) is used as the absorbing liquid.
And water (H ₂ O) as a refrigerant (liquid to be absorbed)
Has been adopted. In FIG. 1, reference numeral 1 denotes a high-temperature regenerator provided with a heating source such as a gas burner. Above the high-temperature regenerator 1, there is provided a gas-liquid separator 3 which is communicated via a liquid pumping pipe 2. In the high temperature regenerator 1,
The dilute solution of lithium bromide is heated and boiled and supplied to a gas-liquid separator 3 located above via a liquid raising pipe 2, where water vapor as a refrigerant vapor and a lithium bromide intermediate concentrated solution as an absorbing liquid ( (Intermediate concentration absorbing solution). The dilute lithium bromide solution supplied to the high-temperature regenerator 1 is obtained by absorbing water vapor as a refrigerant vapor into a lithium bromide concentrated solution as an absorption liquid in an air-cooled absorber 4 described later. After being effectively preheated sequentially through the solution heat exchanger 7 and the high-temperature solution heat exchanger 8, it is returned to the high-temperature regenerator 1. The water vapor separated by the gas-liquid separator 3 is then sent to a low-temperature regenerator 9 where it is condensed. The intermediate lithium bromide solution that has been gas-liquid separated in the gas-liquid separator 3 is heat-exchanged with the lithium bromide dilute solution from the air-cooled absorber 4 in the high-temperature solution heat exchanger 8. The low temperature regenerator 9 is supplied through the orifice 11. In the low-temperature regenerator 9, steam is exchanged between the steam supplied from the gas-liquid separator 3 and the lithium bromide intermediate concentrated solution as described above, so that steam can be removed. As much as possible, the residual water contained in the intermediate lithium bromide solution is evaporated, and a further concentrated lithium bromide concentrated solution is taken out. Next, the water vapor evaporated from the intermediate lithium bromide solution in the low-temperature regenerator 9 in this manner is sent to the air-cooled condenser 10 together with the condensed water in the water vapor mixed state supplied through the orifice 12. The condensed water is surely condensed and liquefied to become condensed water, and further supplied to the condensed water spraying device portion of the evaporator 13. On the other hand, the lithium bromide concentrated solution taken out from the low-temperature regenerator 9 is heat-exchanged with the lithium bromide dilute solution from the air-cooled absorber 4 in the low-temperature solution heat exchanger 7 and then supplied to the main supply pipe 18. From the first and second branch pipes 18a, 18 functioning as flow rate adjusting means.
The liquid is supplied to the first and second absorption liquid distributors 15a and 15b of the air-cooled absorber 4 via the portion 8b. The first and second branch pipes 18a and 18b are, as shown in FIG. 2, a first branch pipe corresponding to the first absorption liquid distributor 15a above the first absorption heat transfer pipe 4a on the upstream side of the air flow. 18
a has a large diameter, and the second and third absorption heat transfer tubes 4 on the downstream side of the air flow.
The second branch pipe 18b corresponding to the second absorption liquid distribution device 15b above the b and 4c is formed with a small diameter, so that a large amount of the absorption liquid flows into the first absorption heat transfer pipe 4a on the upstream side of the air flow. On the other hand, the second and third absorption heat transfer tubes 4
A small amount of absorbing liquid is allowed to flow through b and 4c. The air-cooled absorber 4 includes, for example, first to third pluralities of absorption heat transfer tubes 4a and 4 through which the absorption liquid flows vertically.
b, 4c and the first to third absorption heat transfer tubes 4a, 4b, 4
c A large number of radiating fins F, F provided on respective outer peripheral portions
.. Are provided above the first absorption heat transfer tube 4a, the second absorption heat transfer tube 4b, and the third absorption heat transfer tube 4c, respectively.
Absorption heat transfer tube 4a and the second and third absorption heat transfer tubes 4b,
4 c, the first and second absorbing liquid distributors 15 a and 15 b for distributing the absorbing liquid to each of them, and a blower fan 20. The evaporator 13 circulates a refrigerant (for example, R407) circulating in a secondary refrigerant cycle including the use side heat exchanger 14.
C) and the condensed water sent from the air-cooled condenser 10 exchange heat with each other, and serve as a cold heat source during the cooling operation. The air-cooled absorber 4 forms the dilute lithium bromide solution as described above by absorbing the water vapor evaporated by the evaporator 13 into the concentrated lithium bromide solution. After the lithium bromide dilute solution is once fixed to the lower header 16, it is regenerated at a high temperature through the low-temperature solution heat exchanger 7 and the high-temperature solution heat exchanger 8 by the solution pump 5 via the check valve 6 as described above. It is returned to the vessel 1 and is regenerated at a high temperature. As described above, the first to fourth air-cooled absorbers 4
As shown in the drawing, the third absorption heat transfer tubes 4a to 4c have large pipe diameters whose upstream and downstream sides of the first and second absorption liquid distribution devices 15a and 15b can be individually adjusted. 1. A second branch pipe 18a, 18b having a small pipe diameter is provided, and the absorption liquid supplied through the first and second branch pipes 18a, 18b is distributed to the first and second absorption liquids. The first and second absorption heat transfer tubes 4a, 4b and 4c are arranged to flow through the heat transfer tubes 4a, 4b and 4c through the devices 15a and 15b. The flow rate is set so that the flow rate is higher on the upstream side of the air flow than on the downstream side of the air flow. Therefore, in this configuration, the first to third
Are located on the upstream side of the air flow from the blower fan 20, and the lower the air temperature and the higher the cooling performance, the larger the amount of the absorbing liquid that flows, thereby exhibiting sufficient absorption performance. Become like On the other hand, the higher the air temperature is and the lower the air flow is on the downstream side, the lower the absorption performance is, the smaller the amount of the flowing absorption liquid is, and the heat exchange efficiency and the absorption efficiency are respectively improved. As a result, the heat absorption tubes 4a to 4c of the air-cooled absorber 4 as a whole can realize a uniform heat exchange capacity according to the cooling capacity, and the absorption efficiency and absorption performance of the absorber are improved. In the above configuration, the second absorbing liquid distributor 15b is connected to the second and third absorption heat transfer tubes 4b and 4c with respect to the first absorbing liquid distributor 15a. Is distributed, so that the supply amount of the absorbing liquid per one absorption heat transfer tube is inevitably small even in the normal case. Therefore, it is a matter of course that the setting of the pipe diameter of the first branch pipe 18a for increasing the flow rate on the upstream side is made in consideration of this point. (Modification 1) The first and second branch pipes 1 according to the first embodiment described above.
8a and 18b are configured to change the supply flow rate of the absorbing liquid by changing their tube diameters. For example, as shown in FIG.
An orifice 19 having a small-diameter through hole 19a as shown in FIG. 4 may be provided in the middle of the second branch pipe 18b where the supply flow rate of the absorbing liquid is to be relatively reduced. With such a configuration, it is possible to obtain exactly the same operation and effect (flow rate adjustment operation) as when the above-mentioned tube diameter is changed. (Modification 2) In the configuration of the first embodiment, the first airflow upstream side
The mutual flow rate was changed between the second row and the second row and the third row on the downstream side of the air flow, but this was done so that the flow rate was changed mutually in each of the first row, the second row, and the third row in three stages. It is more effective to make the air flow more upstream in the air flow. Second Embodiment Next, FIGS. 5 to 7 show a configuration of an air-cooled absorption refrigeration apparatus according to a second embodiment of the present invention. In this air-cooled absorption-type refrigeration apparatus, for example, a lithium bromide aqueous solution (LiBr aqueous solution) is used as the absorbing liquid.
And water (H ₂ O) as a refrigerant (liquid to be absorbed)
Has been adopted. In FIG. 5, reference numeral 1 denotes a high-temperature regenerator provided with a heating source such as a gas burner. Above the high-temperature regenerator 1, there is provided a gas-liquid separator 3 which is communicated via a liquid pumping pipe 2. In the high temperature regenerator 1,
The dilute solution of lithium bromide is heated and boiled and supplied to a gas-liquid separator 3 located above via a liquid raising pipe 2, where water vapor as a refrigerant vapor and a lithium bromide intermediate concentrated solution as an absorbing liquid ( (Intermediate concentration absorbing solution). The dilute lithium bromide solution supplied to the high-temperature regenerator 1 is obtained by absorbing water vapor as refrigerant vapor into a lithium bromide concentrated solution as an absorption liquid in an air-cooled absorber 4 described later. After being effectively preheated sequentially through the solution heat exchanger 7 and the high-temperature solution heat exchanger 8, it is returned to the high-temperature regenerator 1. The water vapor separated by the gas-liquid separator 3 is then sent to a low-temperature regenerator 9 where it is condensed. The intermediate lithium bromide solution that has been gas-liquid separated in the gas-liquid separator 3 is heat-exchanged with the lithium bromide dilute solution from the air-cooled absorber 4 in the high-temperature solution heat exchanger 8. The low temperature regenerator 9 is supplied through the orifice 11. In the low-temperature regenerator 9, heat exchange is performed between the steam supplied from the gas-liquid separator 3 and the intermediate concentrated lithium bromide solution as described above, so that steam can be removed. As much as possible, the residual water contained in the intermediate lithium bromide solution is evaporated, and a further concentrated lithium bromide concentrated solution is taken out. Next, the water vapor evaporated from the lithium bromide intermediate concentrated solution in the low-temperature regenerator 9 in this manner is sent to the air-cooled condenser 10 together with the condensed water in the water vapor mixed state supplied through the orifice 12. The condensed water is surely condensed and liquefied to become condensed water, and further supplied to the condensed water spraying device portion of the evaporator 13. On the other hand, the lithium bromide concentrated solution taken out from the low-temperature regenerator 9 is heat-exchanged with the lithium bromide dilute solution from the air-cooled absorber 4 in the low-temperature solution heat exchanger 7 and then supplied to the main supply pipe 18. From the air-cooled absorber 4 functioning as a flow control and distribution means. As shown in FIG. 6, for example, as shown in FIG. 6, the absorption liquid distribution device 15 is provided in the absorption liquid distribution tray 16 of the first to third absorption heat transfer tubes 4a, 4b, 4c. Each of the first to third openings 21a to 21c is protruded at a predetermined height. The first to third absorption heat transfer tubes 4a, 4b, and 4c protrude into the trays.
The first to third openings 21a to 21c are provided on the outer periphery thereof.
Cylindrical first to third inlet caps 22a to 22c having a predetermined height higher than the opening portions 21a to 21c are provided, and the first to third inlet caps 22a to 22c are provided.
An annular first to third gap 24a to 24c having a predetermined dimension is formed between the first and third openings 21a to 21c. Each of the lower ends of the first to third inlet caps 22a to 22c has a plurality of (for example, two) slit-shaped first to first slits communicating with the first to third gaps 24a to 24c. 3. Absorbent inlets 23a to 23c
Are formed at equal intervals in the circumferential direction, for example. The first to first
The third absorbing liquid introduction ports 23a to 23c may be any as long as the absorbing liquid b accumulated at the inner bottom of the absorbing liquid distribution tray 16 can flow into the first to third gaps 24a to 24c.
Therefore, the shape is not necessarily limited to the above-described slit shape, for example, may be a semi-circular shape,
Further, it is not always necessary to form them at equal intervals in the circumferential direction. Then, the absorbing liquid b accumulated in the inner bottom of the absorbing liquid distribution tray 16 is firstly removed from the first to third absorbing liquid introduction ports 23a to 23c of the first to third inlet caps 22a to 22c.
23c to first to third gaps 24a between the first to third inlet caps 22a to 22c and the first to third openings 21a to 21c of the first to third absorption heat transfer tubes 4a to 4c. ~ 2
4c, and then the first to third absorption heat transfer tubes 4a to 4c.
c overflows, and flows down while uniformly wetting the inner wall. In the course of this flow, the refrigerant vapor a from the evaporator 13 is efficiently absorbed. Therefore, even if the level of the absorbing liquid b stored in the absorbing liquid distribution tray 16 fluctuates, the fluctuation is transmitted to the absorbing liquid b stored in the first to third gaps 24a to 24c. The overflow of the absorbent b from the first to third gaps 24a to 24c into the first to third absorption heat transfer tubes 4a to 4c is always maintained in a steady state. And thereby, the stable absorption efficiency in the air-cooled absorber 4 can be maintained. By the way, the first to third absorbent inlets 23a to 23a of the first to third inlet caps 22a to 22c.
3c is a first absorption heat transfer tube 4 on the upstream side of the airflow as shown in the figure.
The first inlet cap 22a on the upper side has a large opening area (high in height), and the second and third inlet caps on the second and third absorption heat transfer tubes 4b and 4c on the downstream side of the air flow. 22
b, 22c are formed in a small opening area (with a small height), whereby a large amount of absorbing liquid flows through the first absorption heat transfer tube 4a on the upstream side of the air flow, while the second absorption downstream side on the air flow side. ,
A small amount of absorbing liquid flows through the third absorption heat transfer tubes 4b and 4c. The air-cooled absorbers 4 are arranged side by side from the upstream side to the downstream side of the air flow, and the above-mentioned first air-absorbing liquid flows vertically.
.. To a plurality of third absorption heat transfer tubes 4a, 4b, 4c, and a large number of radiation fins F, F,... Provided on the outer periphery of each of the first to third absorption heat transfer tubes 4a, 4b, 4c. And provided above the first, second, and third absorption heat transfer tubes 4a, 4b, and 4c, and the first, second, and third absorption heat transfer tubes 4a,
The apparatus is provided with the above-described absorbent distributing device 15 for distributing the absorbent in common to each of 4b and 4c, and a blower fan 20. The evaporator 13 circulates a refrigerant (for example, R407) circulating in the secondary refrigerant cycle including the use side heat exchanger 14.
C) and the condensed water sent from the air-cooled condenser 10 exchange heat with each other, and serve as a cold heat source during the cooling operation. The air-cooled absorber 4 absorbs the water vapor evaporated by the evaporator 13 into the concentrated lithium bromide solution to form a dilute lithium bromide solution as described above. After the lithium bromide dilute solution is once retained in the lower header 16, the solution pump 5
As described above, the heat is returned to the high-temperature regenerator 1 via the low-temperature solution heat exchanger 7 and the high-temperature solution heat exchanger 8 to be regenerated at a high temperature. As described above, the first to the first air-cooled absorbers 4
As shown in FIG. 6, each of the third absorption heat transfer tubes 4a to 4c has an absorption liquid distribution tray 1 of the absorption liquid distribution device 15.
Six portions have first to third absorption liquid introduction ports 23a to 23c having different opening areas which can individually adjust the flow rates for the first to third absorption heat transfer tubes 4a, 4b, and 4c. First to third inlet caps 22a to 22c are provided, and the absorbent supplied through the first to third inlet caps 22a to 22c is supplied to the first, second, and third absorption heat transfer tubes 4a. , 4b, and 4c, and the first to third absorbing liquid inlets 23a to 23c have a large opening area of the first absorbing liquid inlet 23a on the upstream side of the air flow. In each case, the flow rate of the absorbing liquid flowing through the heat transfer tube portion is set so as to be larger at the upstream side of the air flow than at the downstream side of the air flow. Therefore, in this configuration, the first to third
The absorption heat transfer tubes 4a to 4c are located upstream of the airflow from the blower fan 20, and the lower the air temperature and the higher the cooling performance, the larger the amount of the absorbing liquid that flows, thereby exhibiting sufficient absorption performance. Become like On the other hand, the higher the air temperature is and the lower the air flow is on the downstream side of the absorption performance, the smaller the amount of the flowing absorbent is, and the heat exchange efficiency and the absorption efficiency are respectively improved. As a result, as a whole, the first to third absorption heat transfer tubes 4a to 4c of the air-cooled absorber 4 can realize a uniform heat exchange capacity according to the cooling capacity, and the absorption efficiency of the absorber, Improves absorption performance. (Modification 1) In the above embodiment, the openings of the first to third absorbing liquid inlets 23a to 23c of the first to third inlet caps 22a to 22c of the absorbing liquid distribution tray 16 are respectively provided. By changing the area, the flow rate of the absorbing solution was adjusted,
This changes the diameter of the first to third inlet caps 22a to 22c themselves, and the first to third absorption heat transfer tubes 4a to 4c.
The size of the first to third gaps 24a to 24c between the openings 21a to 21c at the upper end of the c is different, or the upper ends 21a of the first to third absorption heat transfer tubes 4a to 4c. ~
The flow rate may be adjusted by changing the protruding height of 21c above. (Modification 2) In the above-described embodiment, the opening areas of the first to third absorbing liquid inlets 23a to 23c are set to the first absorbing liquid inlet 23a on the upstream side of the air flow and the downstream side of the first absorbing liquid inlet 23a. Although the second and third absorption liquid introduction ports 23b and 23c are changed in two stages,
This is more effective if it is changed in three stages so that the higher the order is, the more upstream it is. This is because the diameters of the first to third inlet caps 22a to 22c of the first modification and the first to third inlet caps are different.
The same applies to the heights of the third openings 21a to 21c.

[Brief description of the drawings]

FIG. 1 is a diagram showing the overall configuration of an air-cooled absorption refrigeration apparatus according to Embodiment 1 of the present invention.

FIG. 2 is an enlarged view showing a configuration of a main part of the apparatus.

FIG. 3 is an enlarged view showing a modified example of a main part of the device.

FIG. 4 is an enlarged view of a main part in the configuration of FIG. 3;

FIG. 5 is a diagram showing a configuration of an entire air-cooled absorption refrigeration apparatus according to Embodiment 2 of the present invention.

FIG. 6 is an enlarged sectional view showing a configuration of a main part of the device.

FIG. 7 is an enlarged view showing a configuration of a main part of the apparatus.

[Explanation of symbols]

1 is a high-temperature regenerator, 2 is a liquid pump, 3 is a gas-liquid separator, 4 is an air-cooled absorber, 4a is a first absorption heat transfer tube, 4b is a second absorption heat transfer tube, and 4c is a third absorption transfer tube. Heat tube, 5 is a solution pump, 9
Is a low-temperature regenerator, 10 is an air-cooled condenser, 13 is an evaporator, 15
Is an absorption liquid distribution device, 15a is a first absorption liquid distribution device, 1
5b is a second absorption liquid distribution device, 16 is an absorption liquid distribution tray, 18a is a first branch pipe, 18b is a second branch pipe,
2a to 22c are first to third inlet caps, 23a to 2c
Reference numeral 3c denotes first to third absorbing liquid inlets.

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Katsuhiro Kawabata 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries, Ltd. Sakai Works Kanaoka Factory (56) References JP-A-6-307773 (JP, A) 50-50748 (JP, A) JP-A-10-246532 (JP, A) JP 7-21364 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25B 15 / 00 303 F25B 15/00 306 F25B 37/00

Claims (4)

(57) [Claims] 1. An air-cooled absorber (4) comprising a plurality of rows of absorption heat transfer tubes (4a), (4b) and (4c) for absorbing a refrigerant vapor into an absorbent, and an air-cooled absorber (4). Air blower means (20) for cooling by means of flow rate control means (18a), (18b);
(23a), (23b), (23c), in the air-cooled absorption refrigeration system comprising:
a), (18b), (23a), (23b), (23)
c) is a plurality of rows of absorption heat transfer tubes (4a), (4b), (4).
An air-cooled absorption refrigeration system characterized in that the flow rate of the absorption liquid is adjusted so that the flow rate of the absorption liquid is higher at the upstream side of the air flow in (c) than at the downstream side. 2. Flow rate adjusting means (18a), (18b)
Are the absorption liquid distributors (15a), (1) of the air-cooled absorber (4).
By changing the diameter of the absorption liquid branch pipe to 5b),
The air-cooled absorption refrigeration system according to claim 1, wherein the air-cooling absorption refrigeration system is configured to adjust a flow rate. 3. The flow control means (23a), (23b),
(23c) is obtained by changing the diameter of the absorption liquid inlet caps (22a), (22b) and (22c) of the absorption heat transfer tubes (4a), (4b) and (4c) of the absorption liquid distribution section (15). The air-cooled absorption refrigeration system according to claim 1, wherein the air-flow absorption refrigeration system is configured to adjust a flow rate. 4. A flow control means (23a), (23b),
(23c) is an absorption liquid inlet port (22a) of each absorption heat transfer tube (4a), (4b) and (4c) of the absorption liquid distribution part (15), (22b) and (22c). 2. The air-cooled absorption refrigeration system according to claim 1, wherein the flow rate is adjusted by changing the opening area of each of 23a), 23b and 23c.