JPH04184052A - Multiple effect absorption type freezer - Google Patents

Abstract

PURPOSE:To raise the temperature of refrigerant in a condenser and enhance heat exchange efficiency by introducing condensed refrigerant water into a driving fluid inlet for an ejector and further introducing refrigerant vapor generated in the final process of a low temperature generator into a sucked up fluid of the ejector. CONSTITUTION:A condensed refrigerant water supply passage 52 is connected with a driving fluid inlet 51 of an ejector 50 connected with a refrigerant vapor inlet 41 of a condenser 4 where the vapor generated in a high temperature regenerator 2 is condensed in a low temperature regenerator 3 and introduced into a drive fluid inlet 51 of the ejector 50 still in a high pressure condition. A refrigerant vapor supply passage 54 is connected with a sucked up fluid inlet 53 of the ejector 50 where the refrigerant vapor generated in a low temperature regenerator 3 is introduced. More specifically, the condensed refrigerant water is jetted out toward a condenser 4 at a high pressure where the refrigerant vapor is sucked up with the low temperature regenerator 3 as a suction side. In the condenser 4, the pressure of the vapor is increased and its internal temperature is also increased, thereby increasing the differentce in temperature between the vapor and the open air. It is, therefore, possible to enhance heat exchange efficiency at this site.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a multi-effect absorption refrigerator in which a low-temperature regenerator is provided in a refrigerant supply path from a high-temperature regenerator to a condenser.

[Conventional technology]

A system explanatory diagram and a Dueling diagram of a dual-effect absorption refrigerator (1) as an example of such a multiple-effect absorption refrigerator (1) are shown in FIGS. 6 and 7. The system during cooling operation of this refrigerator (1) will be described below based on a system explanatory diagram. Here, this refrigerator (1) is a high temperature regenerator (2)
and a low-temperature regenerator (3), a condenser (4) provided on the downstream side of the steam path of the low-temperature regenerator (3), and an evaporator (6) that performs heat exchange with the indoor unit cooling system (5). Furthermore, an absorber (7) that absorbs water vapor from the evaporator (6) into an absorption liquid, a solution circulation pump (8), and a low-temperature heat exchanger (9).
, a high temperature heat exchanger (10).

Here, the operation of each device will be explained below in relation to the Duering diagram shown in FIG. 7.

In the high-temperature regenerator (2), the absorption liquid (hereinafter referred to as solution) in a refrigerant-absorbing state is heated by the burner (20), and a portion of the refrigerant turns into steam and flows into the high-temperature regenerator steam path (21) (see diagram). , 3-4-5 (liquid side) and 13 (steam side))
. Furthermore, in the low-temperature regenerator (3), the solution in the low-temperature regenerator (3) is heated by the steam flowing from the high-temperature regenerator steam path (21) mentioned above, and a part of the refrigerant turns into steam, and the condenser ( 4) (diagram, 6-7-8 (vessel side) and 12 (steam side)). The steam in the high temperature regenerator steam path (21) is transferred to the low temperature regenerator (3), the first pressure reducing valve (31), the refrigerant tank (32), and the second pressure reducing valve (33).
In the process leading to the evaporator (6), it is cooled and brought into a low pressure state (diagram 13-12-11). on the other hand,
The steam generated in the low temperature regenerator (3) is sent to the condenser (4) through the low temperature regenerator steam path (34), where it releases the retained heat to the outside air. (Diagram, 12-11).

Further, this refrigerant is cooled and brought to a low pressure state in the process of reaching the refrigerant tank (32), the second pressure reducing valve (33), and the evaporator (6).

The evaporator (6) receives heat from the outdoor heat exchanger (51) of the indoor cooling system (5), and evaporates (diagram 11). Here, the generated vapor is absorbed by the absorption liquid in the absorber (7), and is further brought into a high pressure state by the solution circulation pump (8).
The temperature will be increased by the low-temperature and high-temperature heat exchangers (9) and (10) (diagram 1-2-3).

Furthermore, the solution is transferred to a high temperature regenerator (2), a low temperature regenerator (3)
, a low temperature heat exchanger (9), an absorber (7), a solution circulation pump (8), a low temperature heat exchanger (9), and a high temperature heat exchanger (10).

[Invention or problem to be solved]

Conventionally, the steam generated from the high temperature regenerator (2) is condensed in the low temperature regenerator (3), or is this the low temperature regenerator (3)?
The pressure of the refrigerant was directly reduced by the first pressure reducing valve (31) provided on the downstream side, and the refrigerant was recovered in the refrigerant tank (32). That is, here, the pressure energy held by the refrigerant at this location was wasted without being utilized.

Furthermore, in order to facilitate heat exchange in the condenser (4), it is advisable to raise the temperature of the condenser (4), since this temperature is the evaporation temperature of the refrigerant. It was difficult to control itself without changing the pressure state at.

Therefore, the purpose of the present application is to make it possible to effectively utilize the pressure energy possessed by the refrigerant condensed in the low-temperature regenerator, and to
The object of the present invention is to obtain a multi-effect absorption refrigerator capable of increasing the temperature of refrigerant in the condenser in order to efficiently exchange heat in the condenser.

[Means to solve the problem]

The characteristic structure of the multi-effect absorption chiller according to the present invention to achieve this purpose is that an ejector is installed on the refrigerant vapor inlet side of the condenser connected to the final stage of the low-humidity regenerator operated in the cooling operation state. It is equipped with a condensed refrigerant water supply path that introduces the condensed refrigerant water generated in the low-temperature regenerator into the driving fluid inlet of the ejector, and also supplies the refrigerant vapor generated in the last stage of the low-temperature regenerator to the fluid to be drawn into the ejector. The refrigerant vapor supply path introduced into the inlet is provided, and its functions and effects are as follows.

[For production]

When such a configuration is adopted, the refrigerant water generated in the low-temperature regenerator is guided to the driving fluid inlet of the ejector via the condensed refrigerant water supply path and is ejected. The water vapor generated in the final stage of the low-temperature regenerator is sucked through the connected refrigerant vapor supply path, and the water vapor pressure in the final stage of the low-temperature regenerator is slightly lowered. This can be explained using the diagram shown in Figure 3 for a double-effect absorption refrigerator.
As shown by the broken line in the figure, the heating temperature of the solution (refrigerant evaporation temperature) in the low-temperature regenerator shown in 7.8 decreases. On the other hand, on the condenser side, an extra amount of refrigerant is pushed in by the volume of condensed refrigerant water supplied by the ejector, so the pressure increases slightly. This means that the 12 points on the diagram in FIG. 3 (indicating the state in the condenser section) are moved upward along the saturation line.

〔Effect of the invention〕

Therefore, the refrigerator of the present application can be operated with the temperature inside the condenser slightly raised, so even if this part is used as an air-cooled heat exchange system, for example, air cooling can be performed efficiently and favorably. becomes. Furthermore, if the cooling capacity of the refrigerator is the same, the condenser can be made smaller.

On the other hand, since the internal pressure of the low-temperature regenerator decreases, it becomes possible to lower the refrigerant vapor temperature generated from the high-temperature regenerator (see the diagram below).
The evaporation state decreases to the position indicated by the broken line 13. ), the internal temperature of the high temperature regenerator can also be reduced. This temperature is closely related to the corrosion that occurs within the high-temperature regenerator, and by lowering the temperature, it is possible to realize an advantageous state as a countermeasure against corrosion. As a result, maintainability is improved.

〔Example〕

Embodiments of the present application will be described based on the drawings. Fig. 1 shows a system diagram of an air-cooled double-effect absorption refrigerating machine (1) as an example of a multi-effect absorption refrigerating machine adopting the characteristic configuration of the present application, and Fig. 2 shows a system diagram of this refrigerating machine. An enlarged view of the vicinity of the condenser (4) in the machine (1) is shown. Furthermore, as mentioned above, FIG. 3 shows a diagram corresponding to this refrigerator (1). The explanation of FIG. 3 is the same as that described above.

As shown in FIGS. 1 and 2, an ejector (50) is connected to the refrigerant vapor inlet (41) side of the condenser (4) of the refrigerator (1). The driving fluid inlet (51) of this ejector (50) is connected to a condensed refrigerant water supply path (52) (corresponding to the high temperature regeneration type steam path (21) described above), and the high temperature regenerator (2 ) is condensed through heat exchange in the low-temperature regenerator (3), and is led to the driving fluid inlet (51) of the ejector (5o) in a high pressure state. Furthermore, a refrigerant vapor supply path (54) (the above-mentioned low temperature regenerator internal pressure path) is connected to the suction fluid inlet (53) of this ejector (50).
34)), and is configured so that the refrigerant vapor generated in the low-temperature regenerator (3) is guided thereto.

That is, in the operating state, this ejector (50)
The condensed refrigerant water is blown out at high pressure toward the condenser (4) side, and the low temperature regenerator (3) side is used as the suction side.
This results in inhalation of refrigerant vapor. Here, this low-temperature regenerator (3) is in a state of lower pressure and lower temperature than before. On the other hand, the condenser (4) side is filled with condensed refrigerant water and refrigerant vapor, resulting in a high pressure state, and its internal temperature is also higher than before.

As a result, the temperature difference between the condenser (4) and the outside air becomes larger than before, making it possible to perform heat exchange well in this region.

Now, in the above explanation, we have explained the case where this dual effect absorption refrigerator (1) is used for cooling, but when this refrigerator (1) is used as a heating system, the low temperature regenerator ( 3), from the high temperature regenerator (2) to the evaporator (6) without the condenser (4) and refrigerant tank (32) being used.
The heating supply line (60) connected to the heating/cooling switching valve (6
By switching and using 1), the above-mentioned evaporator (6) will operate as a condenser.

[Another example]

In the above embodiment, an air-cooled type was shown, but this can also be applied to a water-cooled dual-effect absorption refrigerator whose system diagram is shown in FIG. . In this case as well, a similar effect can be obtained in the condenser (4).

An example of the condenser (4) in this case is shown in FIG.

Furthermore, here, the multi-effect absorption refrigerating machine includes an absorption refrigerating machine equipped with a single low-temperature regenerator for a high-temperature regenerator, and one equipped with a plurality of low-temperature regenerators.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings by the reference numerals.

[Brief explanation of drawings]

The drawings show the configurations of multiple-effect absorption refrigerators according to the present invention and conventional examples. Figure 1 is a detailed view of the vicinity of the condenser of the refrigerator, Figure 3 is a cycle diagram of the refrigerator shown in Figure 1, Figure 4 is a system explanatory diagram of the water-cooled dual-effect absorption refrigerator, and Figure 5 is a detailed diagram of the vicinity of the condenser of the refrigerator. The figure shows the condenser of the refrigerator shown in Figure 4, Figure 6 is an explanatory diagram of the system of a dual-effect absorption refrigerator with a conventional configuration, and Figure 7 shows the system of a double-effect absorption refrigerator with a conventional configuration. It is a cycle diagram. (3)...Low temperature regenerator, (4)...Condenser, (41)...Refrigerant vapor inlet, (50)...
・River ejector, (51)... Drive fluid inlet, (52)... Condensed refrigerant water supply path, (53
)...Suctioned fluid inlet, (54)...
・Refrigerant vapor supply path.

Claims (1)

[Claims] In a multi-effect absorption refrigerator, a refrigerant vapor inlet (41) of a condenser (4) connected to the final stage of a low-temperature regenerator (3) operated in a cooling operating state.
An ejector (50) is placed on the side, and the low temperature regenerator (
The condensed refrigerant water generated in step 3) is transferred to the ejector (50).
A condensed refrigerant water supply path (52) is provided to introduce the driving fluid inlet (51) into the driving fluid inlet (51) of the refrigerant vapor generated in the last stage of the low temperature regenerator (3).
A multi-effect absorption refrigerating machine equipped with a refrigerant vapor supply path (54) introduced into the suction fluid inlet (53) of 0).