JPH10185353A - Adsorption type refrigerating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a delay in adsorption reaction due to the rise of the temperature of outer peripheral unit of an adsorbent by a method wherein the fins for an adsorbing element and the outer periphery of the adsorbent are covered by a reticulated or porous metallic outer cylinder to improve the heat conduction of the outer peripheral unit of the adsorbing element. SOLUTION: An adsorbing element 6 is provided in respective gaps between fins 4, formed integrally with and spirally on a tube 3, penetrating through a vacuum vessel for an adsorption type refrigerating device and conducting heat medium (hot-water) or refrigerant (cooling water) of a heat source side to flow it. In this case, the outer peripheral surface of the fins 4 and the adsorbing element 6, filled with metallic threads 12 or metallic pieces 14, is covered by a reticulated metallic outer cylinder 15 or a porous metallic outer cylinder (punching metal). According to this method, the thermal conduction of the outer peripheral unit of the adsorbing element 6 is improved and, especially, adsorption heat, generated in the outer peripheral part of the adsorbent during adsorbing process, is transferred to the tubes 3 quickly whereby a delay in adsorbing reaction due to the temperature rise of the outer peripheral unit of the adsorbent can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adsorption refrigeration system that performs heat exchange using an adsorbent.

[0002]

2. Description of the Related Art FIG. 4A is a view showing the structure of a conventional adsorption refrigeration apparatus of this type, and FIG. 4B is a sectional view showing a tube as a component thereof. These configurations are disclosed in Japanese Utility Model Application Laid-Open No. Sho 63-142659.

The adsorption refrigeration apparatus shown in FIGS. 4 (a) and 4 (b) has a first heat source-side heat medium passing through an internal space 53 of a body 51 of a vacuum vessel in which a required amount of a coolant such as water is sealed. Are provided, and second fin tubes 54, 54 through which the use-side heat medium passes. First
In the fin tube 52, a plurality of fins 57 orthogonal to the outer surface of the heat transfer tube 56 are provided. Also the second
In the fin tube 54, a wire fin 62 is spirally arranged on the outer surface of the heat transfer tube 61.

On the surface of the fin 57, natural zeolite,
An adsorbent 58 such as activated carbon, activated alumina or silica gel is applied to a binder 59 having a higher thermal conductivity than the adsorbent 58, for example, using a heat-resistant inorganic adhesive such as Sumiceram (trade name) or the like for about 3 minutes in the gap between the fins 57. In a thin layer of about 1. These solid-state adsorbents 5
Between the eight layers, a flat space 60 is formed as a refrigerant vapor passage from the tip of the fin 57 to the outer peripheral surface of the conduction tube 56.

[0005] The bottom of the body 51 is provided with a tank 6 for heating or cooling by passing the body bottom 511 through hot or cold water.
3 is provided integrally, and at a position below the tank 63, a pipe 6 having a vacuum valve 64 in the middle is provided.
5 is connected to a refrigerant storage tank 66 having a predetermined capacity that can always maintain a vacuum.

Further, in order to improve the thermal conductivity of the adsorbent 58, a substance having a high thermal conductivity such as copper powder is mixed in advance with the adsorbent 58 and solidified, and the solidified material is fixed to the fins 57. There is also provided a method of bonding the particulate adsorbent 58 to the fin 57 by using the binder 59 in which copper powder is mixed in advance.

Further, the adsorbent 5 fixed to the fin 57
Examples of the embodiment 8 include those shown in FIGS. 5 (a) to 5 (d). 5A to 5D, the same parts as those in FIG. 4B are denoted by the same reference numerals.

Next, the operation of the above-described conventional adsorption refrigeration system will be described. First, during the desorption operation, the heat source side heat medium (for example, hot water at 60 to 80 ° C.) is placed in the first fin tube 52.
And the adsorbent 58 is heated and desorbed, and the 30-
Supply cooling water at 32 ° C.

Then, the refrigerant vapor discharged by the heating and desorption of the adsorbent 58 is cooled and condensed on the surface of the second fin tube 54, and the liquid refrigerant flows into the gap between the fins 62 and the heat transfer tubes 61 in a liquid film state. In large quantities.

That is, in the first fin tube 52, the adsorbent 58 is directly fixed to the fin 57, the particles of the adsorbent 58 come into surface contact with the surface of the fin 57, and the heat transfer coefficient at this portion increases. Therefore, the heating speed is high and the desorption process time is greatly reduced.

Next, the operation during the adsorption operation will be described. First,
Cooling water (30 to 32 ° C.) is supplied to the first fin tube 52 to cool the adsorbent 58 and adsorb the refrigerant vapor in the body 51. Then, on the surface of the second fin tube 54, the refrigerant held by the fins 62 evaporates vigorously, deprives the fin tube 54 of heat of vaporization, and the utilization side heat medium passing through the second fin tube 54 is Inlet temperature 12 ° C
From the outlet to about 7 ° C.

If the amount of refrigerant charged inside the body 51 becomes excessive due to a change in operating conditions (temperature conditions), the second
The heat source side heat medium is supplied to the first fin tube 52 while the supply of the refrigerant into the fin tube 54 is shut off. When cooling water is supplied to the tank 63 while heating and desorbing the adsorbent 58, most of the refrigerant in the body 51 is condensed on the body bottom surface 511. At this time, when the vacuum valve 64 is opened, the refrigerant liquid is cooled by gravity. Collected in the storage tank 66.

[0013]

In the above-mentioned conventional adsorption-type refrigeration apparatus, the adsorbent 58 is fixed to the surfaces of the fins 57 of the fin tubes 52, 52, and as a means for increasing the thermal conductivity between the two. Provided. When the adsorbent 58 adsorbs moisture in the body 51 of the vacuum vessel, the heat of adsorption is
The adsorbent 58 mixed with copper powder and the like is in a state where the copper powder and the like are separated from each other. Therefore, the heat conduction is better than when the copper powder is not mixed, but there is a disadvantage that the heat conduction is not improved unless the copper powder is mixed in a large amount. In addition, if the amount is too large, there is a problem that the amount of the adsorbent 58 decreases and the amount of adsorption decreases.

An object of the present invention is to improve the heat conduction at the outer peripheral portion of the adsorbing element, and particularly to quickly transfer the heat of adsorption generated at the outer peripheral portion of the adsorbent to the tube in the adsorption step, thereby increasing the temperature at the outer peripheral portion of the adsorbent. Accordingly, it is an object of the present invention to provide an adsorption refrigerating apparatus which can prevent a delay in an adsorption reaction.

[0015]

According to a first aspect of the present invention, a fin is provided on a surface of a tube through which a heat medium flows, and an adsorbent is provided on the surface of the tube and the fin. An adsorption refrigerating apparatus having a fixed adsorption element, wherein the outer periphery of the fin and the adsorbent of the adsorbing element is covered with a mesh-like or porous metal outer cylinder in contact therewith.

According to the first aspect of the present invention, since the outer periphery of the fin and the attraction of the attraction element is covered with the mesh-like or porous metal outer cylinder in contact therewith, the heat conduction at the outer periphery of the attraction element is improved. In particular, the heat of adsorption generated at the outer periphery of the adsorbent in the adsorption step is promptly transferred to the tube,
It is possible to prevent the temperature of the outer peripheral portion of the adsorbent from rising and delaying the adsorption reaction.

According to a second aspect of the present invention, in order to achieve the above object, a metal thread or a strip-shaped metal piece is mixed in the adsorbent. It is a type refrigeration system.

According to the second aspect of the present invention, the temperature inside the adsorbing element becomes uniform quickly and the thermal conductivity (heat transfer) thereof is accelerated and improved. Adsorption is promoted, and evaporation and condensation in the heat exchanger can be performed effectively.

In order to achieve the above object, the invention according to claim 3 is characterized in that the metal thread or the strip-shaped metal piece is brought into contact with the surface of the tube, the fin, and the metal outer cylinder. An adsorption type refrigerating apparatus according to claim 2, wherein

According to the third aspect of the present invention, since the metal thread or the strip-shaped metal flake is brought into contact with the surface of the tube, the fin, and the metal outer cylinder, the metal thread of the tube, the fin, and the adsorption element is provided. Alternatively, by cooling the adsorbent through the metal piece, the adsorbent in the vacuum vessel constituting the adsorption refrigerating apparatus is adsorbed by the adsorbent of the adsorption element. Therefore, the concentration of the adsorbent in the vacuum vessel becomes low, and the adsorbent in the lower part of the vacuum vessel and in contact with the heat exchanger evaporates, and the steam generated at that time takes away heat of vaporization from its surroundings. . Therefore, the cold water of the heat exchanger is further cooled, and the cooled low-temperature cold water can be used.

[0021]

FIG. 1 is a diagram showing a schematic configuration of a first embodiment of an adsorption refrigerating apparatus according to the present invention. In FIG. 1, a tube 3 through which a heat medium (warm water) or a coolant (cooling water) on the heat source side flows through a vacuum vessel 2 of the adsorption-type refrigeration apparatus 1.
Is inserted. Fins 4 are provided in the tube 3 in a spiral shape and are integrally formed. Adsorption elements 6 are fixed to gaps of the fins 4. The lower portion in the vacuum vessel 2 is filled with water as an adsorbent, and a heat exchanger 7 having an evaporation / condensation function is provided. The heat exchanger 7 is connected to a pipe so that cold water enters and exits.

Although the fins 4 are integrally formed in FIG. 1, they may be fixed by brazing or the like. Furthermore, the shape is not limited to a spiral shape, and a ring-shaped shape may be attached at equal intervals. Although water is used as the adsorbent, it may be adsorbed by other adsorbents. However, it is preferable that water is used because of easy handling.

FIG. 2A shows the fin 4 and the metal thread 12.
Alternatively, the outer peripheral surface of the suction element 6 containing the metal piece 14 is covered with a net-shaped metal outer cylinder 15, and a portion in which the inner peripheral surface of the metal outer cylinder 15 is in contact with the outer peripheral surfaces of the fins 4 and the adsorption element 6 is a cross section. FIG.

FIG. 2B is a perspective view showing a case where a porous metal outer cylinder (punching metal) 16 is provided instead of the metal outer cylinder 15 shown in FIG. 2A. In both figures, the fins 4 are shown as ring-shaped fins, but may be helically wound erotic fins, and the suction element 6 includes a metal thread 12 or a metal piece 14. 6 is a metal thread 12 or a metal piece 1
4 may not be included.

FIG. 3C is a view showing the structure of the suction element 6. In FIG. 3 (c), an adsorption element 6 fixed on the outer periphery of the tube 3 and the side surface of the gap between the fins 4 is shown.
Is formed by integrally forming an adsorbent 11 and a metal thread 12 with a binder (adhesive) 13. As the adsorbent 11, silica gel, alumina gel, activated carbon, or the like is used.

In this embodiment, the metal thread 12 is made of copper or aluminum having a predetermined length, which is inexpensive and has good thermal conductivity. The metal yarn 12 contains the adsorbent 1 of the adsorption element 6.
1 and the binder 13 as uniformly as possible, and in some cases, the metal threads 12
Are in contact with the outer periphery of the tube 3 and the side surfaces of the fins 4 to enhance thermal conductivity. Further, as the binder 13, a strip-shaped metal piece 14 having a predetermined length such as an aluminum foil having good heat conductivity can be used instead of the metal thread 12 using an ethylene-based vinyl acetate resin or a phenol resin. is there.

FIGS. 3D and 3E are cross-sectional views showing a state where the suction element 6 is fixed to the tube 3 and the fin 4. By making the shape in which the adsorption element 6 is fixed to the tube 3 and the fin 4 as shown in FIGS. 3D and 3E, the desorbing effect of the adsorbent (water) increases.

In the structure of the suction element 6 described above,
In the desorption step in the operation of the adsorption refrigeration apparatus 1, the fluid (hot water or the like), which is a heat medium on the heat source side, is caused to flow through the tube 3 to regenerate the adsorbent 11. That is, by flowing warm water or the like into the tube 3, the adsorbent 11 is heated via the tube 3, the fins 4, and the metal thread 12 or the metal piece 14 of the adsorbent element 6, and the material adsorbed and held by the adsorbent 11 is heated. The adsorbent (water) is desorbed and cooled and condensed by the cooling water in the heat exchanger 7.

In the adsorption step during operation, the adsorbent 11 adsorbs the adsorbent (water vapor) in the vacuum vessel 2. The heat of adsorption generated at that time is removed by flowing a fluid (cooling water or the like) as a cooling source heat medium into the tube 3 in advance. That is, by cooling the adsorbent 11 through the tube 3 and the fins 4 and the metal thread 12 or the metal piece 14 of the adsorption element 6, the adsorption-type refrigeration system 1 is cooled.
Is adsorbed by the adsorbent 11 of the adsorption element 6.

Accordingly, the concentration of the adsorbent (water vapor) in the vacuum vessel 2 becomes low, whereby the adsorbent (water) at the lower part of the vacuum vessel 2 and in contact with the heat exchanger 7 evaporates. The steam generated at that time deprives the surroundings of heat of vaporization. Therefore, the cold water of the heat exchanger 7 is further cooled,
The cooled low-temperature cold water can be used.

By preparing two such devices and using them alternately, cold water can always be obtained using hot water.
In addition, by mixing the metal thread 12 or the metal piece 14 into the adsorption element 6 composed of the adsorbent 11 and the binder 13, the reinforcement between the adsorbent 11 and the binder 13 is strengthened, and the adsorbent 11 and the binder 13 are combined. 13 is less likely to break even under load.
Therefore, the resistance to heat stress is increased. Here, with respect to the heat conduction and the strength, the effect is superior when the metal yarn 12 is mixed, as long as the amount of the mixed metal is about the same as when the metal piece 14 is mixed. However, if the metal piece 14 is sufficiently thin, sufficient effects can be obtained in practical use.

That is, when metal powder is used, only a small part of the metal powder has a high thermal conductivity around the metal powder, and heat passes through the metal part to make the temperature uniform. However, in this case, the amount of the metal powder must be increased because the metal powder is divided and the heat is not easily applied.
However, in the case of a metal thread or a metal piece, heat is easily transmitted in the length direction, and the entire surface thereof has a uniform temperature, so that the heat conduction of the adsorption element 6 is very good.

It should be noted that the present invention is not limited to the above-described embodiment, and can be implemented with appropriate modifications without departing from the scope of the invention. According to the above-described adsorption refrigeration apparatus 1 of the present invention, the following operational effects can be obtained according to the embodiment.

(1) As shown in FIG. 2, when the fins 4 and the suction element 6 are covered with a mesh-shaped metal outer cylinder 15 or a porous metal outer cylinder 16, the outer periphery of the suction element 6 and the tube 3 is connected by the metal of the outer cylinder 15 or 16 and the fins 4, so that the thermal conductivity is improved and the temperature can be made uniform promptly. Prevents the adsorption reaction from being delayed.

(2) As shown in FIG. 3, the adsorption type refrigerating apparatus 1 is a vacuum vessel 2 in which a predetermined amount of adsorbent (water) is sealed.
A tube 3 through which a heating fluid is passed to remove the heat of adsorption generated when the adsorbent is adsorbed on the adsorbent 11 and the adsorbent is desorbed from the adsorbent 11, A fin 4 provided on the tube 3 for facilitating heat transfer between the tube 3 and the adsorbent 11, and a binder (a binder for fixing the adsorbent 11 to the tube 3 and the fin 4 and joining the adsorbents 11 together) Adhesive) 13
A metal thread 12 or a strip-shaped thin metal piece 14 is mixed and bonded to the adsorption element 6 formed by the adsorbent 11 and the binder 13.

In the gap between the fins 4 provided in the tube 3 for supplying the fluid of the heat source body of the adsorption refrigeration system 1, a metal thread 12 or a metal piece 14 is mixed with the adsorbent 11 to form a binder (adhesive). The heat of the heat medium flowing through the tube 3 is fixed to the adsorbent 11 and the binder 13 and the mixed metal thread 1
The heat is reliably transferred to the adsorbent 11 in the volume occupied by the adsorption element 6 via the metal piece 2 or the metal piece 14. When the temperature of the adsorbent 11 rises due to heat of adsorption, the adsorbent 11 and the binder 13 are transmitted to the cooling water flowing through the tube 3 via the mixed metal thread 12 and metal piece 14.

That is, by mixing the metal thread 12 or the metal piece 14, the temperature in the suction element 6 becomes uniform quickly, and the heat conductivity (heat transfer) thereof is accelerated and improved, so that the heat absorption in the suction element 6 is improved. The desorption / adsorption of the adsorbent is promoted, and the evaporation / condensation in the heat exchanger 7 can be effectively performed. That is, by mixing a much smaller amount of the metal piece 14 or the metal thread 12 than in the case of using metal powder, heat conduction is improved and efficiency can be improved, and the strength of the adsorption element 6 that cannot be obtained with metal powder is also improved. In addition, the durability of the suction element 6 is improved.

[0038]

According to the present invention, the heat conduction at the outer peripheral portion of the adsorbing element is improved, and particularly, the heat of adsorption generated at the outer peripheral portion of the adsorbent in the adsorption step is quickly transferred to the tube, and the temperature of the outer peripheral portion of the adsorbent is increased. Thus, it is possible to provide an adsorption-type refrigeration apparatus that can prevent the adsorption reaction from delaying due to the increase in the temperature.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of an adsorption refrigeration apparatus of the present invention.

FIGS. 2A and 2B are diagrams for explaining a specific configuration of FIG. 1; FIGS. 2A and 2B are perspective views showing a state in which a fin and an adsorbent are covered with an outer cylinder of a metal mesh; The perspective view which shows the state which covered the adsorbent with the porous metal outer cylinder.

3A and 3B are diagrams for explaining a specific configuration of FIG. 1; FIG. 3C is a configuration diagram of a suction element, and FIGS. 3D and 3E are states in which the suction element is fixed to a tube and a fin, respectively; FIG.

FIG. 4 is a schematic configuration diagram illustrating an example of a conventional adsorption refrigeration apparatus, where (a) is a diagram illustrating a configuration of an adsorption refrigeration apparatus;
(B) is sectional drawing which shows a tube.

5 (a) to 5 (d) are cross-sectional views showing different examples of fins of the conventional adsorption refrigeration apparatus of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Adsorption type refrigeration apparatus 2 ... Vacuum container 3 ... Tube 4 ... Fin 6 ... Adsorption element 7 ... Heat exchanger 11 ... Adsorbent 12 ... Metal thread 13 ... Binder (adhesive) 14 ... Metal piece 15 ... Outer cylinder ( Metal net) 16 ... Outer cylinder (perforated metal plate) 51 ... Body 511 ... Body bottom 52 ... First fin tube 53 ... Internal space 54 ... Second fin tube 56 ... Heat transfer tube 57 ... Fin 58 ... Adsorbent 59 ... Binder 60 ... Void 61 ... Heat transfer tube 62 ... Wire fin 63 ... Tank 64 ... Vacuum valve 65 ... Piping 66 ... Refrigerant storage tank

Continuation of the front page (72) Inventor Masayoshi Hiramatsu 20-1 Kitakanyama, Odaka-cho, Midori-ku, Nagoya-shi, Aichi Pref. Electric Power Utilization Research Laboratory, Chubu Electric Power Co., Inc. (72) Inventor Tomoko Kasuga Nagoya-shi, Aichi 20-1 Kitakanyama, Midori-ku Odaka-cho, Chubu Electric Power Co., Inc. Inside the Electric Power Utilization Research Laboratory (72) Inventor Shuichi Adachi 1-Midori, Iwazuka-cho, Nakamura-ku, Nagoya-shi, Aichi Prefecture Mitsubishi Heavy Industries, Ltd. Inside the factory (72) Inventor Toshiro Takeuchi Aichi Takamichi, Iwazuka-cho, Nakamura-ku, Nagoya-shi, Aichi Prefecture Mitsubishi Heavy Industries, Ltd.Nagoya Equipment Mfg. Co., Ltd. Nagoya Research Laboratory, Mitsubishi Heavy Industries, Ltd.

Claims (3)

[Claims] 1. An adsorption refrigeration apparatus having a fin provided on a surface of a tube through which a heat medium flows, and an adsorption element having an adsorbent fixed to the surface of the tube and the fin, wherein the fin of the adsorption element and the adsorbent are An adsorption-type refrigeration apparatus, wherein the outer periphery is covered with a mesh-shaped or porous metal outer cylinder in contact with the outer circumference. 2. The adsorption-type refrigeration apparatus according to claim 1, wherein a metal thread or a strip-shaped metal piece is mixed into the adsorbent. 3. The adsorption-type refrigeration apparatus according to claim 2, wherein the metal thread or the strip-shaped metal piece is brought into contact with the surface of the tube, the fin, and the metal outer cylinder.