JP2002181412A - Heat-exchanger module for adsorption refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat-exchanger module for an adsorption refrigerator, in which performance improvement and miniaturization of not only the module but also the adsorption refrigerator can be attained. SOLUTION: The heat exchanger module 10 for an adsorption refrigerator is composed of a plurality of heating tubes 38 and fins 40. In the module, a single cylindrical heat exchanging tube 38 is provided. The form of the fin 40 is given by connecting concentric circles with the heating tubes 38 as their center, and constrictions 46 are formed in the fin. In the former constitution, the flow path of the refrigerant vapor is prevented from being blocked, and the density of the effective adsorbent material can be sufficiently heightened. Further, in the latter constitution, a part having a heat-transfer delay is eliminated, adsorption-desorption efficiency can be improved, resulting in performance improvement and miniaturization of the refrigerator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange module used in an adsorption refrigeration system.

[0002]

2. Description of the Related Art In an adsorption refrigeration system, a heat exchange module filled with an adsorbent is an essential component. FIG. 6 shows a conventional heat exchange module 100 for an adsorption refrigeration system.
It is shown. As shown in this figure, a heat exchange module 100 for an adsorption-type refrigeration apparatus has a large number of heat transfer tubes 102 each formed in a circular cross section and arranged in a staggered manner, each formed in a substantially rectangular flat plate shape, and has a predetermined shape. Fins 104 arranged side by side and supporting the heat transfer tube 102
And an adsorbent (not shown) filled between adjacent fins 104.

[0003]

However, the conventional heat exchange module 100 for an adsorption-type refrigeration system having the above-described structure has a problem that the adsorption / desorption efficiency of the module alone is low and the performance of the adsorption-type refrigeration system is low. Was.

That is, in the conventional heat exchange module 100 for an adsorption-type refrigeration system having the above structure, the heat transfer tube 10 having a circular
In this case, the heat transfer to the adsorbent proceeds concentrically around the heat transfer tube 102 along the plane direction of the fin 104. Therefore, the adsorption / desorption reaction in the peripheral portion of the heat transfer tube 102 is delayed more than the adsorption / desorption reaction in the vicinity of the heat transfer tube 102. The hatched portion in FIG. 7 is the heat transfer delay portion. Therefore, in an extreme case, in one heat exchange module 100 for an adsorption-type refrigeration apparatus, a desorption reaction occurs in the adsorbent due to good heat conductivity in the vicinity of the heat transfer tube 102. Since the heat transfer property is poor in the portion, the adsorbent remains in a cooled state and an adsorption reaction occurs. In other words, one heat exchange module 100 for the adsorption refrigeration system
In this case, desorption and adsorption occur at the same time, which causes a problem that the adsorption / desorption efficiency inside the module is reduced.

[0005] In the conventional heat exchange module 100 for an adsorption-type refrigeration apparatus having the above-described configuration, the heat transfer tubes 102 are arranged in a staggered manner.
(Indicated by hatching). Therefore, no matter how much this portion is filled with the adsorbent, the flow path of the refrigerant vapor is blocked, so that the capacity as the adsorbent cannot be sufficiently brought out. In other words, when the flow path of the refrigerant vapor is closed, there is a problem that the overall effective adsorbent density decreases.

Therefore, in the case of the conventional heat exchange module 100 for an adsorption type refrigeration system, the heat absorption / desorption efficiency inside the module is reduced and the effective adsorbent density of the module as a whole is lowered. There is a problem that the performance of the entire exchange module 100 is reduced.

Further, assuming that the performance of the heat exchange module 100 for the adsorption refrigeration apparatus is reduced as described above, the heat exchange module 1 for the adsorption refrigeration apparatus 1
In addition, there is a problem that the entire adsorptive refrigeration apparatus becomes large.

The present invention has been made in view of the above-described circumstances, and has as its object to provide a heat exchange module for an adsorption-type refrigeration apparatus that can improve the performance and the size of the adsorption-type refrigeration apparatus.

[0009]

According to a first aspect of the present invention, there are provided a plurality of heat transfer tubes to which a heat medium is supplied, each of the plurality of heat transfer tubes being formed in a plate shape and arranged at a predetermined interval, and a plurality of the heat transfer tubes. A heat exchange module for an adsorption-type refrigeration apparatus, comprising: a plurality of fins supporting a heat pipe and transmitting heat from the heat transfer pipe; and a number of adsorbents filled in gaps between adjacent fins. The plurality of heat transfer tubes are piped in a single row, and the fins are formed by connecting points at substantially equal distances from the heat transfer surface of the heat transfer tube to connect an outer shape formed in the pipe direction. Is characterized by the fact that

According to a second aspect of the present invention, in the heat exchange module for an adsorption-type refrigeration apparatus according to the first aspect, the heat transfer tube is a circular tube, and the fin is a concentric circle with respect to the heat transfer tube. It is characterized in that it has a shape that is partially overlapped and connected in the pipe direction.

According to a third aspect of the present invention, in the heat exchange module for an adsorption-type refrigeration apparatus according to the first aspect, the heat transfer tube is a flat rectangular tube, and the fin surrounds the heat transfer tube. Are formed by partially overlapping rectangles in the pipe direction and connecting them.

The operation of the heat exchange module for an adsorption type refrigerating apparatus according to the present invention described in claim 1 is as follows.

[0013] In the desorption step of the adsorption refrigerating apparatus, hot water or the like, which is a heat medium as a heating source, is fed into the heat transfer tube, whereby the adsorbent is regenerated. That is, by heating the adsorbent through the heat transfer tubes and the fins, the refrigerant vapor adsorbed by the adsorbent is desorbed. Further, the refrigerant vapor is discharged out of the module through a gap between the adsorbents filled between the fins. The discharged refrigerant vapor is condensed in a separately configured condenser.

On the other hand, in the adsorption step of the adsorption type refrigeration apparatus, cooling water or the like, which is a heat medium as a cooling source, is fed into the heat transfer tube, whereby the refrigerant is adsorbed by the adsorbent. That is, by cooling the adsorbent through the heat transfer tubes and the fins, the refrigerant vapor is sucked into the module from a separately-configured evaporator, and is further passed through the gap between the adsorbents filled between the fins. It is continuously adsorbed by the adsorbent.

Here, in the present invention, since a plurality of heat transfer tubes are arranged in a single row, it is possible to eliminate the obstruction of the flow path of the refrigerant vapor to the adsorbent as in the conventional staggered piping. Can be. For this reason, the density of the effective adsorbent as the whole module can be sufficiently increased.

Further, in the present invention, the shape of the fin is such that the outer shape formed by connecting points at substantially equal distances from the heat transfer surface of the heat transfer tube is connected in the pipe direction. Disappears. Therefore, simultaneous desorption and adsorption in one heat exchange module can be prevented, and the efficiency of adsorption and desorption in the module can be improved.

Further, according to the present invention, since the performance of the heat exchange module can be improved as described above, the size of the heat exchange module and further the entire adsorptive refrigeration apparatus can be reduced.

According to the second aspect of the present invention, since the heat transfer tube is a circular tube, heat transfer to the fins proceeds concentrically (one-dimensionally in the radial direction) around the heat transfer tube. In view of this point, in the present invention, the shape of the fin is a shape in which concentric circles with respect to the heat transfer tube are partially overlapped and connected in the pipe direction, so that the adsorption / desorption reaction does not become extremely delayed as compared with other portions.

According to the third aspect of the present invention, since the heat transfer tube is a flat rectangular tube, heat transfer to the fins proceeds vertically from the heat transfer surface of the heat transfer tube. In the present invention, in view of this point, the shape of the fin is such that the rectangle surrounding the heat transfer tube is partially overlapped and connected in the pipe direction, so that the adsorption / desorption reaction is extremely delayed as compared with other portions. Disappears.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A heat exchange module 10 for an adsorption refrigeration system according to a first embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows an overall configuration diagram of an adsorption type refrigeration apparatus 12 including a heat exchange module 10 for an adsorption type refrigeration apparatus according to this embodiment, and FIG. 2 shows an adsorption type refrigeration apparatus according to this embodiment. The front view and the side view of the heat exchange module 10 for a refrigerating apparatus are shown in an enlarged manner. 3 and 4
2 shows details of the part A and the part B of FIG.

First, the overall configuration of the adsorption refrigeration system 12 will be outlined.

As shown in FIG. 1, the adsorption type refrigerating apparatus 12 according to the present embodiment includes a condensing tank 14, an evaporating tank 16, and a pair of first adsorbing / desorbing tanks 18 arranged in parallel between them. The second adsorption / desorption tank 20 is configured as a main part.

The condenser tank 14 is connected to a condenser-side heat exchanger 22, and a pump (not shown) is operated to supply cooling water or the like as a heat medium.
Further, the evaporating tank 16 is connected to an evaporating tank-side heat exchanger 24, and when a pump (not shown) is operated, cold water or the like as a heat medium is supplied. further,
The first adsorption / desorption tank 18 is connected to a first adsorption / desorption tank side heat exchanger 26, and the second adsorption / desorption tank 20 is connected to a second adsorption / desorption tank side heat exchanger 28. In each of the first adsorption / desorption tank side heat exchanger 26 and the second adsorption / desorption tank side heat exchanger 28, a pump (not shown) operates according to the state of the first adsorption / desorption tank 18 and the second adsorption / desorption tank 20. As a result, cold water or hot water, which is a heat medium, is supplied.

A first check valve 30 is provided in a pipe connecting the condensation tank 14 and the first adsorption / desorption tank 18, and a pipe connecting the evaporation tank 16 and the first adsorption / desorption tank 18. Has a second check valve 3
2 is provided, and a third check valve 34 is provided in a pipe connecting the condensation tank 14 and the second adsorption / desorption tank 20 to connect the evaporation tank 16 and the second adsorption / desorption tank 20 to each other. A fourth check valve 36 is provided in the connecting pipe. The operation of the pump and the opening and closing of the check valve are controlled by a controller (not shown).

Here, the first adsorption / desorption tank 18 and the second
In the adsorption / desorption tank 20, the drawings (a) and (b) of FIG.
A plurality of units of the heat exchange module 10 for an adsorption-type refrigeration system shown in FIGS.

As shown in these figures, the heat exchange module 10 for the adsorption-type refrigeration system is formed in a plate shape with a plurality of heat transfer tubes 38 to which a heat medium is supplied, and is arranged at a predetermined interval. And a plurality of fins 40 supporting the plurality of heat transfer tubes 38 and transmitting heat from the heat transfer tubes 38.
And a number of adsorbents 44 (see FIG. 3) filled in the gaps 42 between the adjacent fins 40. For reference, the external dimensions of the heat exchange module 10 for an adsorption-type refrigeration system are shown in FIG. In the description of the adsorption-type refrigeration unit heat exchange module 10, “a plurality of heat transfer tubes 38” is described. Is described because the plurality of heat transfer tubes 38 are present independently at the end face of (the term "plurality of heat transfer tubes" is used throughout the specification in this specification). The heat transfer tube 38 is constituted by bending a single circular tube into a bellows shape as a whole.

In this embodiment, the plurality of heat transfer tubes 3
8 are piped in a single row in the module height direction. The plurality of fins 40 support the plurality of heat transfer tubes 38 of the single-row pipe, and in the present embodiment, the fins 4
As shown in FIG. 4, the shape of 0 is a shape in which outer shapes (arcs) formed by connecting points equidistant from the heat transfer surface 38A of the heat transfer tube 38 are connected in the pipe direction. In other words, according to the present embodiment, since a circular tube is used as the heat transfer tube 38 in the present embodiment, the fin 40 has a radius R1 around the heat transfer tube 38.
Are partially overlapped and connected in the pipe direction (that is, the module height direction).

In the fin 40 thus formed, a pair of constricted portions 46 each having a radius R2 is formed to connect the adjacent disk-shaped fin portions 40A. The radius R2 of the constricted portion 46 is smaller than the radius R1 of the fin portion 40A. By the way,
The connection between the arcs of the adjacent fin portions 40A is preferably as small as the radius R2 of the constricted portion 46. However, in consideration of the diffusion of steam and the filling and holding of the adsorbent 44, L (width dimension of the connection portion) ≧ 5 mm , R2 <R1 / 4.

When the fins 40 having the above-described configuration are used, the plurality of fins 40 are covered with a cover conforming to the outer shape of the fins 40, and a large number of adsorbents 44 are provided in the gaps 42 between adjacent fins 40. Will be filled. Therefore, basically, the adsorbent 44 does not exist at a position beyond the outer shape of the fin 40.

Next, the operation and effect of this embodiment will be described.

First, an outline of an actual operation of the adsorption refrigeration apparatus 12 according to the present embodiment will be described.

In the first cycle, the adsorption step by the first adsorption / desorption tank 18 and the desorption step by the second adsorption / desorption tank 20 are performed simultaneously. In this case, the first check valve 30 is closed, the second check valve 32 is open, the third check valve 34 is open, and the fourth check valve 36 is closed. In the adsorption-type refrigeration unit 12, a heat medium such as cold water is supplied to the first adsorption / desorption tank side heat exchanger 26 to generate cold heat due to the evaporation of the refrigerant so that the adsorbent 44 in the first adsorption / desorption tank 18 is discharged. After cooling, refrigerant vapor (water vapor) is discharged from the evaporation tank 16 to the first adsorption / desorption tank 18.
It is sucked into the heat exchange module 10 for the adsorption-type refrigeration system inside, and continuously adsorbed on the adsorbent 44 through the gap of the adsorbent 44 filled between the fins 40.

At this time, since the fourth check valve 36 is closed, the refrigerant vapor is not sent to the condensing tank 14 side.
In the condensation tank 14, a heat medium such as hot water is supplied to the second adsorption / desorption tank side heat exchanger 28, and the adsorbent 44 in the second adsorption / desorption tank 20 is supplied.
Is heated. When heated, the adsorbent 44 desorbs and regenerates the adsorbed refrigerant vapor. The refrigerant vapor desorbed here is discharged outside the module through the gap between the adsorbents 44 filled between the fins 40 of the heat exchange module 10 for the adsorption refrigeration system. The discharged refrigerant vapor is sent to the condensing tank 14 because the third check valve 34 is open. In the condensing tank 14, since the cooling water is supplied into the condensing tank side heat exchanger 22, the refrigerant vapor is condensed and covered.

On the other hand, in the next cycle, the second adsorption / desorption tank 2
0 and the desorption step by the first adsorption / desorption tank 18 are performed simultaneously. That is, the adsorption step and the desorption step are switched. In this case, the first check valve 30 is in the open state,
The check valve 32 is closed, the third check valve 34 is closed, and the fourth check valve 36 is open.

As described above, in the adsorption type refrigeration system 12, the above-described cycle operation is performed alternately, whereby the evaporating tank 1 is operated.
6, the heat can be continuously obtained. The refrigerant vapor is supplied by evaporating the refrigerant stored in the evaporating tank 16. Further, the cold heat accompanying the refrigerant evaporation is supplied to the evaporating tank 16.
Of the evaporating tank 16 via the evaporating tank side heat exchanger 24 connected to the
It is taken out.

Here, in the present embodiment, since the heat transfer tube 38 is a circular tube, the heat transfer to the fins 40 is performed by the heat transfer tube 38.
And concentrically (one-dimensionally in the radial direction). Therefore, heat transfer to a portion near the heat transfer tube 38 is fast, but heat transfer to a portion far from the heat transfer tube 38 is delayed. That is, the adsorption / desorption reaction of the adsorbent 44 around the heat transfer tube 38 is delayed as compared with the adsorption / desorption reaction of the adsorbent 44 near the heat transfer tube 38. For example, the heat transfer to the adsorbent 44 shown by the solid line in FIG. 4 is fast, but the adsorbent 44 shown by the two-dot chain line (in the conventional structure, the adsorbent was also present at this position). The heat transfer to is slowed down. Therefore, in an extreme case, the adsorbent 44 close to the heat transfer tube 38 is well heated and desorbed, but the adsorbent 44 far from the heat transfer tube 38 remains in a cooled state and performs an adsorbing action. That is, desorption and adsorption occur simultaneously in one module, and the adsorption / desorption efficiency is reduced. However, in this embodiment, in view of this point, the shape of the fin 40 is formed by connecting concentric circles to the heat transfer tube 38 by partially overlapping in the pipe direction, so that the adsorption / desorption reaction is extremely delayed as compared with other portions. That is, it is possible to prevent the occurrence of a heat transfer delay portion, and to achieve a uniform adsorption / desorption reaction.

In this embodiment, a plurality of heat transfer tubes 38 are provided.
Are arranged in a single row, so that the flow path of the refrigerant vapor to the adsorbent can be prevented from being blocked as in the conventional staggered piping. For this reason, the density of the effective adsorbent as the whole module can be sufficiently increased. This also widens the steam flow path.

As a result, according to the present embodiment, it is possible to improve the performance of the heat exchange module 10 for the adsorption type refrigeration apparatus, and thus the adsorption type refrigeration apparatus 12.

Further, in this embodiment, since the performance of the heat exchange module 10 for the adsorption refrigeration system can be improved in this way, the heat exchange module 10 for the adsorption refrigeration system, and further, the entire adsorption refrigeration system 12 can be improved. Can be reduced in size.

Incidentally, there is experimental data showing the effect when the heat exchange module 10 for an adsorption type refrigerating apparatus according to the present embodiment is used. In addition,
The dimensions of the heat transfer tubes 38 and the fins 40 used in this experiment are as follows.

Heat transfer tube: Outer diameter = 12.7 mm, heat transfer tube pitch = 32 mm, copper circular tube. Fin; plate thickness = 0.3 mm, fin width = 32 mm, R1
= 16 mm, R2 = 4 mm, copper plate.

[0043]

[Table 1]

As can be seen from the above table, in the case of the present embodiment, the required adsorbent can be reduced by about 18% and the heat capacity can be reduced by about 15% as compared with the old type, and the module efficiency can be improved. .

[Second Embodiment] A heat exchange module 50 for an adsorption refrigeration apparatus according to a second embodiment of the present invention will be described below with reference to FIG.

As shown in this figure, in the heat exchange module 50 for the adsorption type refrigerating apparatus according to the present embodiment, the cross-sectional shape of the heat transfer tube 52 is a flat rectangular shape, and the fins 54 are The present invention is characterized in that a rectangular shape surrounding the heat transfer tube 52 is partially overlapped and connected in the pipe direction.

To supplement the fin shape, for example,
C and d shown in FIG. 5 (B) are the third and fourth stages of the “heat transfer tube 5”.
2 ". Heat transfer tubes 52
When the fins 54 are partially overlapped and connected in the pipe direction of the fins 54, that is, in the height direction, the fins 54 according to the present embodiment are formed. Note that a boundary line S between the rectangle c and the rectangle d
Is indicated by a single dashed line, but this portion is conceptually a "partially overlapped and connected" portion.

Further, since the present embodiment is also a subordinate concept of the invention according to claim 1, the relationship between the two will be slightly supplemented. Claim 1 describes "an outer shape formed by connecting points at substantially the same distance from the heat transfer surface of the heat transfer tube". Although described here as “substantially equidistant”, when this is applied to the present embodiment as “equidistant”, for example, a rectangle j becomes a substantially track-shaped j ′ indicated by an arrow.
become. This substantially track-shaped j ′ is an outer shape formed by connecting points equidistant from the heat transfer surface 52A of the heat transfer tube 52.
However, it is not practical to actually manufacture the fins in which the fins are joined, because it is costly waste. Therefore, in order to realize the invention according to claim 1 in accordance with the flat rectangular heat transfer tube 52 including the cost, it is appropriate to simulate with the rectangle j, and the present embodiment was created. . For this reason, claim 1 does not describe “equidistant” but describes “substantially equidistant”.

This embodiment is also conceptually the same as the first embodiment, and is effective for eliminating the heat transfer delay, and the steam flow path to the adsorbent 44 is hardly blocked.
The heat exchange module 50 for the adsorption-type refrigeration apparatus, and thus the adsorption-type refrigeration apparatus 12, can be improved in performance and reduced in size.

In the first and second embodiments described above, water is used as the heat medium. However, another heat medium can be used.

In the first and second embodiments described above, the fin 4 is used because water is used as the heat medium.
Although the materials 0 and 54 are made of copper, they are not limited to this, and other materials can be used.

Further, in the first embodiment described above, the heat transfer tube 38 having a circular cross section is used, and in the second embodiment, the heat transfer tube 52 having a flat cross section is used. When a heat tube is used, the fin shape can be determined similarly.

[0053]

As described above, the heat exchange module for an adsorption type refrigeration system according to the first aspect of the present invention has a plurality of heat transfer tubes arranged in a single row, and the shape of the fins of the heat transfer tubes is reduced. Since the outer shape formed by connecting points that are approximately equidistant from the heat transfer surface is connected in the pipe direction, it is possible to improve the performance and downsizing of the heat exchange module and thus the adsorption refrigeration system. Has excellent effects.

According to a second aspect of the present invention, there is provided a heat exchange module for an adsorption-type refrigeration apparatus according to the first aspect of the present invention, wherein the heat transfer tube is a circular tube, and the fin is arranged in a concentric circle with respect to the heat transfer tube in a pipe direction. Since it has a shape of being partially overlapped and connected, it has an excellent effect that the adsorption / desorption reaction can be homogenized.

According to a third aspect of the present invention, there is provided a heat exchange module for an adsorption refrigerating apparatus according to the first aspect of the present invention, wherein the heat transfer tube is a flat rectangular tube, and the fins surround the heat transfer tube. Has a superior effect that the adsorption and desorption reaction can be homogenized.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an adsorption refrigeration apparatus including a heat exchange module for an adsorption refrigeration apparatus according to a first embodiment.

FIG. 2 is an enlarged front view and a side view of the heat exchange module for the adsorption refrigeration apparatus of FIG. 1;

FIG. 3 is a detailed view of a portion A in FIG. 2;

FIG. 4 is a detailed view of a portion B in FIG. 2;

FIG. 5 is a front view and a side view showing a heat conversion module for an adsorption-type refrigeration apparatus according to a second embodiment.

FIG. 6 is an enlarged front view and a side view of a heat exchange module for an adsorption-type refrigeration apparatus according to a conventional example.

FIG. 7 is an explanatory diagram for explaining a problem of a conventional example.

FIG. 8 is an explanatory diagram for explaining another problem of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Heat exchange module for adsorption refrigeration equipment 12 Adsorption refrigeration equipment 38 Heat transfer tube 38A Heat transfer surface 40 Fin 42 Gap 44 Adsorbent 46 Constriction 50 Heat exchange module for adsorption refrigeration device 52 Heat transfer tube 52A Heat transfer surface 54 Fin

Claims (3)

[Claims] 1. A plurality of heat transfer tubes to which a heat medium is supplied, and each of the plurality of heat transfer tubes is formed in a flat plate shape and arranged at predetermined intervals, and supports the plurality of heat transfer tubes to transfer heat from the heat transfer tubes. A plurality of fins and a plurality of adsorbents filled in the gaps between adjacent fins, the heat exchange module for an adsorption-type refrigeration system, wherein the plurality of heat transfer tubes are arranged in a single row. Wherein the fin has a shape in which an outer shape formed by connecting points located at substantially equal distances from the heat transfer surface of the heat transfer tube is connected in the pipe direction, Heat exchange module for refrigeration equipment. 2. The heat transfer tube is a circular tube, and the fin has a shape in which concentric circles with respect to the heat transfer tube are partially overlapped and connected in the pipe direction. A heat exchange module for an adsorption refrigeration apparatus as described in the above. 3. The heat transfer tube is a flat rectangular tube, and the fin has a shape in which rectangles surrounding the heat transfer tube are partially overlapped and connected in the pipe direction. The heat exchange module for an adsorption refrigeration apparatus according to claim 1.