JPH02118366A - Air-cooled absorption type refrigerator - Google Patents

Abstract

PURPOSE:To make air cooling possible even if an external air temperature becomes high by a method wherein respective absorbers are connected with one another in sequence so that an absorption liquid flows from a first stage absorber to a final stage absorber, cooling air is allowed to flow in series from the final stage absorber to the first stage absorber, and cold water is allowed to flow in series from a final stage evaporator to a first stage evaporator. CONSTITUTION:For example, an absorption liquid with 64% concentration is sprayed to a first stage absorber 1 and absorbs a refrigerant vapor in a first stage evaporator 2 provided above the first stage absorber 1, and its concentration becomes 62.7%. This absorption liquid is pumped up and sprayed to an intermediate stage absorber 6 and absorbs a refrigerant vapor from an intermediate stage evaporator 5 provided above the intermediate stage absorber 6 to reduce the concentration to 61.3%. This absorption liquid is pumped up again and led to a final stage absorber 8 to obtain a dilute solution with 60% concentration. A cold water tube 18 formed in a series is arranged from a final stage evaporator 7 through the first stage evaporator 2 so that the inlet part of the cold water tube is provided on the final stage evaporator 7 from which the absorption liquid with the lowest concentration absorbs the refrigerant vapor and the outlet part thereof is provided on the first stage evaporator 2 from which the absorption liquid with the highest concentration (64%) absorbs the refrigerant vapor. Further, cold air is blown by an air cooling fan 19 provided on the back side of the first stage absorber 1, thereby, for example, cold water at 13 deg.C at the inlet part of the cold water tube 18 is lowered down to 7 deg.C when it finally flows out of the first stage evaporator 2.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a multistage air-cooled absorption refrigerator that combines a plurality of evaporators and absorbers.

<Prior Art> As a conventional air-cooled absorption refrigerator which is an air-cooled absorption chiller/heater for taking out cold water, for example, Japanese Patent Application Laid-Open No. 58-208559 is known. This system combines a pair of evaporators and absorbers with vertical finned cooling pipe sections arranged above and below, and a configuration in which a single cold water pipe for heat exchange is provided in the evaporator section. It is something that

<Problems to be Solved by the Invention> However, with this method, when the outside temperature becomes high, cold water at a predetermined temperature cannot be taken out. For example, regarding the Duehring diagram (concentration-pressure curve of lithium bromide solution) shown in Figure 4, the evaporation temperature of the evaporator is 6.5°C, the concentrated liquid is 64%, the seed oil is 60%, and the cold water is 13°C.
When the temperature reaches 7℃, the cooling air can be taken out at 35℃.
℃, and if the cooling air is raised any further, it will not be possible to obtain cold water at 7℃.

In view of the above circumstances, it is an object of the present invention to provide an air-cooled absorption refrigerating machine that eliminates the above-mentioned drawbacks by dividing the absorber into a plurality of parts and combining each absorber with an evaporator. .

Means for Solving the Problems> The present invention provides a multi-stage air-cooled absorption refrigerator in which a plurality of evaporators and a plurality of absorbers are respectively combined, in which an absorption liquid is
Each absorber is connected in sequence so that it flows from the absorber at the final stage to the absorber at the final stage, and the cooling air is flowed in series from the absorber at the final stage to the first stage absorber, and the first stage absorber paired with the first stage absorber is The cold water is made to flow in series from the final stage evaporator to the first stage evaporator with respect to the first stage evaporator and the final stage evaporator of the final stage absorber.

Effect〉 Due to the above structure, the 64% concentrated liquid is first blown with the coldest air (
The evaporated refrigerant is absorbed by the evaporated refrigerant in the 1st stage evaporator located above, and the slightly diluted concentrated liquid is distributed to the 2nd stage intermediate stage absorber. Finally, the most diluted absorption liquid is guided to the final stage absorber where cooling air is applied, and the diluted liquid (60%) is discharged from the lower end to the high temperature regenerator. The pipes are connected in series to the multistage evaporators, and by introducing cold water from the final stage evaporator and drawing it out from the first stage evaporator, water at 13°C can be turned into cold water at 7°C. In other words, because of multi-stage absorption and multi-stage evaporation, even if the cooling air inlet temperature of the absorber rises to a high temperature of 39°C, for example, it will remain at 7°C.
cold water can be easily obtained.

<Example> The present invention will be described below based on the drawings of the example.

Figure 1 shows the main parts of the evaporator and absorber of an air-cooled absorption refrigerator, and 1 is an air-cooled type 4 having a downstream pipe section 4 with fins 3 on which the first stage evaporator 2 is disposed. This is a one-stage absorber. Next to the first-stage absorber 1, there is provided an intermediate-stage absorber 6, which is the second stage, and an intermediate-stage evaporator 5, which is the second stage, is disposed in the upper part as described above. A final stage absorber 8 having a final stage evaporator 7 serving as a third stage is sequentially provided in each of the absorbers 1, 6, .
The absorbed concentrated liquid facing 8 is distributed to the dispersion section 9 in the upper part of the first stage absorber 1.
A series flow path is provided from the pump 10 at the lower end to the dispersion section 11 of the intermediate stage absorber 6, and from the pump 12 at the lower end to the dispersion section 13 of the final stage absorber 8. The high temperature regenerator (
(not shown).

In addition, the first stage evaporator 2. Intermediate evaporator 5. The refrigerant distribution parts 14.15.16 of the final stage evaporator 7 are arranged in parallel with the refrigerant pipes 17, and the cold water pipes 1 facing each evaporator 2.5.7.
8 is a final stage evaporator 7 opposite to the flow of the absorption liquid in the absorber.
to the intermediate stage evaporator5. It has a configuration in which it flows in series to the first stage evaporator 2. Furthermore, the cooling air for each absorber 31, 6.8 is arranged at the back of the first stage absorber 1 and is blown in from the final stage absorber 8 side.

Next, to explain this effect, first of all, this air-cooled absorption refrigerating machine uses the refrigerant evaporation conditions in order to cool the heat generated by the absorption of refrigerant vapor in the absorber at extremely high temperatures. In order to change the absorber and evaporator to two or more stages (three stages in the illustration) and to operate at different pressures, multiple combinations of absorbers and evaporators (three in the diagram) are installed. This is what I did.

Here, if a predetermined refrigeration cycle is operated, for example, an absorption liquid with a concentration of 64% is sprayed on the first stage absorber 1, and the refrigerant vapor in the upper first stage evaporator 2 is absorbed, and the concentration of the refrigerant is 62.7%. The concentration is 61.3%, which is then pumped up and dispersed in the intermediate stage absorber 6, and the refrigerant vapor from the upper intermediate stage evaporator 5 is absorbed as described above to reach a concentration of 61.3%, which is pumped up again and distributed in the final stage absorber. 8 to obtain a 60% dilute solution.

In this case, in the series of cold water pipes 18, the inlet part flows from the final stage evaporator 7 where the absorbent liquid with the lowest concentration faces, and the absorbent liquid with the highest concentration sequentially flows, and the outlet part with the absorbent liquid with the highest concentration (64%). The cold air is applied from the final stage absorber 8 side, which is the seed oil side, and the warm air is discharged through the first stage absorber 1, which is the concentrated liquid side. This is carried out using an air cooling fan 19 disposed at the back of the first stage absorber 1. In this way, for example, if the inlet temperature of the cold water pipe 18 is 13°C, it will be 11°C when passing through the final stage evaporator 7, and 9°C when passing through the next intermediate stage evaporator 5.
When the water finally leaves the first stage evaporator 2, it becomes cold water at 7°C.

By the way, to explain the Dueling diagram (Figures 2 and 3) that shows the relationship between the absorber and the evaporator, when the cold water condition is changed from 13℃ to 7℃, the concentrated liquid that becomes the absorption liquid is When the diluted liquid is fixed at 64% and 80%, the pressure is 6.5 m with this method (in the diagram, 3-stage absorption and 3-stage evaporation).
Absorbing refrigerant vapor from the first stage evaporator of I1g, 62.7
The refrigerant vapor from the intermediate stage evaporator is absorbed into the next stage at a pressure of 8.5++usl1g, resulting in a concentration of 61.3%, and finally the refrigerant vapor from the final stage evaporator at a pressure of 10.5usl1g is absorbed. It is absorbed and becomes a 60% dilute solution. In this case, it can be seen from the diagram that the absorber should be cooled to 47°C. Moreover, even if the cooling air is raised to 39°C, the same cold water of 7°C can be obtained. In addition, the third
The figure is a simplified explanatory diagram of the Duering diagram of FIG. 2.

<Effects of the Invention> As described above, the air-cooled absorption refrigerator of the present invention has a multi-stage construction in which a plurality of evaporators and a plurality of absorbers are combined, so that the outside temperature can be raised to a high temperature (for example, 39°C). Air cooling is now possible even in the 1990s, and the effects of its use are extremely large. This conversely leads to the miniaturization of the fan, resulting in a quiet absorption refrigerating machine, and the heat transfer area can be reduced, which also allows the device to be made more compact. Further, the device of the present invention has a simple structure in which evaporators and absorbers having different pressures are sequentially combined, and has advantages such as being easy to manufacture.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing essential parts of the present invention, FIG. 2 is a Duering diagram based on an embodiment of the present invention, FIG. 3 is a simplified explanatory diagram thereof, and FIG. 4 is a Duering diagram of a conventional example. 1... 1st stage absorber, 2... 1st stage evaporator, 7...
・Final stage evaporator, 8...Final stage absorber, 9.11゜1
3... Spreading part, 14.15.16... Refrigerant spreading part,
18...Cold water pipe, 19...Cooling fan. 11 Tsuyoshi Osamu Hitoshi Matayuki Male 13 figures

Claims (1)

[Claims] 1. In a multi-stage air-cooled absorption refrigerator that combines multiple evaporators and multiple absorbers, each absorber is connected in sequence so that the absorption liquid flows from the first-stage absorber to the final-stage absorber. At the same time, cooling air is passed in series from the final stage absorber to the first stage absorber, and chilled water is supplied to the first stage evaporator paired with the first stage absorber and the final stage evaporator of the final stage absorber. An air-cooled absorption refrigerating machine characterized by flowing the water in series from the final stage evaporator to the first stage evaporator.