JPH09329370A - Adsorption refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accelerate and improve the heat transmission speed of an adsorption element by a method wherein a metallic yarn is mixed in an adsorbent fixed at the adsorption element. SOLUTION: A tube 3 through which a heating medium (hot water) or a refrigerant (cooling water) on the heat source side flows is extended through the vacuum vessel of an adsorption type refrigerating device. A fin 4 is spirally and integrally formed in the tube 3. Further, adsorption elements 6 are fixed between the adjoining fins 4. An adsorbent 11 and a metallic yarn 12 integrally molded by a bonding agent 13 are used as the adsorption element 6. When the metallic yarn 12 makes contact with the outer periphery of a tube 3 and the side of the fin 4, thermal conductivity is improved. Or, instead of the metallic yarn 12, a strip-form metallic piece 14, such as an aluminum foil having high thermal conductivity, having a given length may be used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adsorption type refrigeration system for exchanging heat with an adsorbent.

[0002]

2. Description of the Related Art FIG. 3 (a) is a diagram showing the structure of a conventional adsorption type refrigerating apparatus of this type, and FIG. 3 (b) is a sectional view showing a tube which is a component thereof. These configurations are disclosed in Japanese Utility Model Application Laid-Open No. Sho 63-142659.

In the adsorption type refrigerating apparatus shown in FIGS. 3A and 3B, a heat source side heating medium is passed through an internal space 53 of a body 51 of a vacuum container in which a required amount of refrigerant such as water is sealed. 1
The fin tubes 52, 52 and the second fin tubes 54, 54 for allowing the heat medium on the use side to pass therethrough are housed.
In the first fin tube 52, a plurality of fins 57 that are orthogonal to the outer surface of the heat transfer tube 56 are arranged. In the second fin tube 54, the wire fins 62 are 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 used as a binder 59 having a higher thermal conductivity than the adsorbent 58, for example, a heat-resistant inorganic adhesive such as Sumiceram (trade name) is used for about 3 minutes of space between the fins 57. No. 1 is bonded in a thin layer. These solid-state adsorbents 5
Between the eight layers, a flat void 60 is formed as a refrigerant vapor passage extending from the tips of the fins 57 to the outer peripheral surface of the heat transfer tube 56.

The bottom of the body 51 is integrally provided with a tank 63 which heats or cools the bottom surface 511 of the body by passing it through hot water or cooling water. A vacuum valve 64 is provided in the middle of the tank 63 below the tank 63. It is connected to a refrigerant storage tank 66 having a predetermined capacity capable of constantly maintaining a vacuum via a pipe 65 provided with.

Further, in order to improve the thermal conductivity of the adsorbent, a substance having a high thermal conductivity such as copper powder is previously mixed into the adsorbent 58 itself and solidified, and this is fixed to the fin 57, There is also provided a method of adhering the granular adsorbent 58 to the fins 57 using a binder 59 in which copper powder is mixed in advance. Further, as a form of the adsorbent 58 fixed to the fin 57, there are the forms shown in FIGS. 4 (a) to 4 (d). FIG.
3A to 3D, the same parts as those in FIG. 3B are denoted by the same reference numerals.

Next, the operation of the adsorption type refrigerating apparatus having the above structure will be described. First, during the desorption operation, the heat source side heat medium (for example, 60 to 80 ° C.) is added to the first fin tube 52.
Hot water) to heat and desorb the adsorbent 58,
Cooling water of 30 to 32 ° C. generated by a cooling tower or the like is supplied to the second fin tubes 54. Then, the refrigerant vapor discharged by the heat desorption of the adsorbent 58 is cooled and condensed on the surface of the second fin tube 54, and a large amount of liquid refrigerant is formed in the opposed gap between the fin 62 and the heat transfer tube 61 in a liquid film state. Retained. That is, in the first fin tube 52, the adsorbent 58 is directly fixed to the fin 57, and the particles of the adsorbent 58 make surface contact with the surface of the fin 57,
Since the heat transfer coefficient in this portion is high, the heating rate is high and the desorption process time is greatly shortened.

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
To the outlet temperature of about 7 ° C.

If the amount of refrigerant charged in 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 bottom surface 511 of the body 51. Therefore, if the vacuum valve 64 is opened at this time, the refrigerant liquid is gravitational force. Refrigerant storage tank 6
Recovered in 5.

[0010]

The above-mentioned conventional adsorption type refrigerating apparatus is one in which an adsorbent is fixed to the fin surface of a fin tube and is provided as a means for increasing the thermal conductivity between the two. . The heat of adsorption when the adsorbent adsorbs the water in the vacuum container body is absorbed by the fluid in the fin tube through the fins, but the copper powder is separated from the adsorbent mixed with copper powder. It is in a state. 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. Further, if the mixing amount is too large, the amount of the adsorbent becomes small, and the amount of adsorption becomes small. An object of the present invention is to provide an adsorption type refrigerating apparatus which accelerates desorption / adsorption of an adsorbent by increasing the heat conduction rate in the adsorption element.

[0011]

In order to solve the above problems and achieve the object, the adsorption type refrigerating apparatus of the present invention is constructed as follows. (1) The adsorption refrigeration apparatus of the present invention is the adsorption refrigeration apparatus having a fin provided on a surface of a tube through which a heat medium flows inside, and an adsorption element having an adsorbent adhered to the surface of the tube and the fin. A metal thread is mixed in the adsorbent fixed to the element. (2) The adsorption refrigeration apparatus of the present invention is an adsorption refrigeration apparatus having a fin on the surface of a tube through which a heat medium flows and an adsorption element having a solid adsorbent adhered to the surface of the tube and the fin. Strip-shaped metal flakes are mixed in the adsorbent fixed to the adsorption element. (3) The adsorption type refrigeration apparatus of the present invention is the apparatus described in (1) or (2) above, wherein the metal thread or the metal flakes are brought into contact with the surfaces of the tubes and the fins.

As a result of taking the above-described measures, the following effects are produced. (1) According to the adsorption type refrigeration apparatus of the present invention, since the metal thread is mixed in the adsorbent fixed to the adsorption element, the temperature in the adsorption element becomes fast and uniform, and Since the conduction speed is accelerated and improved, desorption and adsorption of the adsorbent in the adsorption element can be promoted, and evaporation and condensation in the heat exchanger can be effectively performed. (2) According to the adsorption refrigeration apparatus of the present invention, since strip-shaped thin metal flakes are mixed in the adsorbent fixed to the adsorption element, the temperature in the adsorption element becomes fast and uniform. Since the heat conduction speed (heat transfer) is accelerated and improved, desorption / adsorption of the adsorbent in the adsorption element can be promoted, and evaporation / condensation in the heat exchanger can be effectively performed. (3) According to the adsorption type refrigeration apparatus of the present invention, since the metal thread or the metal flakes are brought into contact with the surfaces of the tube and the fin, the tube, the fin,
And by cooling the adsorbent through the metal thread or the metal piece of the adsorption element, the adsorbent in the vacuum container constituting the adsorption refrigeration apparatus is adsorbed by the adsorbent of the adsorption element. . Therefore, the concentration of the adsorbent in the vacuum container becomes low, the adsorbent in the lower part of the vacuum container in contact with the heat exchanger is evaporated, and the water vapor generated at that time evaporates from its surroundings. Take away. Therefore, the cold water of the heat exchanger is further cooled, and the cooled low-temperature cold water can be used.

[0013]

1 is a diagram showing the configuration of an adsorption type refrigerating apparatus according to an embodiment of the present invention. In FIG. 1, a tube 3 through which a heat medium (warm water) or a refrigerant (cooling water) on the heat source side flows is inserted into a vacuum container 2 of an adsorption type refrigeration apparatus 1. The fins 4 are integrally formed on the tube 3 in a spiral shape.
An adsorption element 6 is fixed to each of the gaps. The lower part of the vacuum container 2 is filled with water as an adsorbent, and a heat exchanger 7 having a function of evaporation / condensation is further provided, and is connected by piping so that cold water can flow in and out.

Although the fin 4 is integrally formed in FIG. 1, it may be fixed by brazing. 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, water is preferable because it is easy to handle.

FIG. 2A is a diagram showing the structure of the adsorption element 6. In FIG. 2A, in the adsorption element 6 fixedly provided on the outer circumferential surface of the tube 3 and the side surface of the gap between the fins 4, the adsorbent 11 and the metal thread 12 are bonded together (adhesive) 13
It is integrally formed by. 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 thread 12 is the adsorbent 11 of the adsorption element 6.
And the binder 13 are mixed into the binder 13 as evenly as possible, and in some cases, the metal threads 12 are in contact with each other, or the metal threads 12 are in contact with the outer circumference of the tube 3 and the side surfaces of the fins 4 to enhance heat conductivity. It is also possible to use ethylene vinyl acetate resin, phenol resin, or the like as the binder 13, and to replace the metal thread 12 with a strip-shaped metal piece 14 having a predetermined length, such as an aluminum foil having good thermal conductivity. is there.

2B and 2C are sectional views showing a state in which the adsorption 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. 2B and 2C, the adsorbing effect of the adsorbent (water) is improved. In the structure of the adsorption element 6 described above, in the desorption process in the operation of the adsorption refrigeration system 1, the adsorbent 11 is regenerated by flowing a fluid (hot water or the like) that is a heat medium on the heat source side into the tube 3. . That is, by flowing hot water or the like into the tube 3, the adsorbent 11 is heated through the tube 3, the fins 4, and the metal threads 12 or the metal pieces 14 of the adsorbent element 6, and the adsorbent 11 adsorbed and held by the adsorbent 11 is adsorbed and held. The agent (water) is desorbed, cooled in the heat exchanger 7 by cooling water and condensed.

In the adsorption step during operation, the adsorbent 11 adsorbs the adsorbent (water vapor) in the vacuum container 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 tubes 3, the fins 4 and the metal threads 12 or the metal pieces 14 of the adsorption element 6, the adsorbed material (steam) in the vacuum container 2 constituting the adsorption refrigeration apparatus 1 is cooled. Are adsorbed by the adsorbent 11 of the adsorption element 6.

Therefore, the concentration of the adsorbent (water vapor) in the vacuum container 2 becomes low, so that the adsorbent (water) in the lower part of the vacuum container 2 in contact with the heat exchanger 7 evaporates, The steam generated at that time removes the heat of vaporization from its surroundings. Therefore, the cold water in the heat exchanger 7 is further cooled, and the cooled low-temperature cold water can be used. By preparing two sets of such devices and alternately using them, cold water can always be obtained by using hot water.

By mixing the metal thread 12 or the metal piece 14 into the adsorbing element 6 composed of the adsorbent 11 and the binder 13, the adsorbent 11 and the binder 13 are reinforced with each other by the admixture. Therefore, the binder 13 is less likely to be broken even if it receives a load. Therefore, the resistance to heat stress is increased. Here, for heat conduction and strength, the metal thread 12
If the mixed amount of the metal is approximately the same as the mixed amount of the metal piece 14, the effect is excellent. However, if the metal piece 14 is sufficiently thin, sufficient effects can be obtained in practical use.

That is, when the metal powder is used, the thermal conductivity is increased only in a small part around the metal powder, and heat is passed through the metal part to make the temperature uniform. However, in this case,
Since the metal powder and the metal powder are separated from each other and heat is hard to be transmitted, the amount of the metal powder has to be increased. However, in the case of a metal thread or a metal piece, heat is easily transferred in the length direction, and the entire surface thereof has a uniform temperature, so that the heat transfer of the adsorption element 6 is very good.

The present invention is not limited to the above-mentioned embodiments, and can be modified and implemented as appropriate without departing from the scope of the invention. (Summary of Embodiments) In the adsorption type refrigeration system 1 shown in the embodiment, the adsorbent 11 is placed in the body of the vacuum container 2 in which a predetermined amount of adsorbent (water) is enclosed. A tube 3 through which a fluid for removing heat of adsorption generated during adsorption and a heating fluid for desorbing the adsorbent from the adsorbent 11 are passed, and heat transfer between the tube 3 and the adsorbent 11 is facilitated. For adhering the adsorbent 11 to the tube 3 and the fins 4 and for joining the adsorbents 11 to each other.
3, the metal thread 12 or the 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 arranged in the tube 3 for supplying the fluid of the heat source of the adsorption type refrigerating apparatus 1, the adsorbent 11 is mixed with the metal thread 12 or the metal piece 14 to form a binder (adhesive). By fixing the adsorption element 6 formed of 13, the heat of the heat medium flowing in the tube 3 is absorbed by 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 the heat of adsorption, it is transferred to the cooling water flowing in the tube 3 through the adsorbent 11 and the binder 13 and the mixed metal thread 12 or metal piece 14.

That is, by mixing the metal thread 12 or the metal piece 14, the temperature in the adsorption element 6 becomes faster and uniform, and the heat conduction speed (heat transfer) thereof is accelerated and improved. The desorption / adsorption of the adsorbent can be promoted, and the evaporation / condensation in the heat exchanger 7 can be effectively performed. That is, a much smaller amount of metal pieces 14 or metal threads 12 than when metal powder is used.
By mixing in, the heat conduction is improved and the efficiency is improved, and the adsorption element 6 that is difficult to obtain with metal powder
The strength of the suction element 6 is also improved, and the durability of the adsorption element 6 is also improved.

[0025]

According to the present invention, it is possible to provide an adsorption type refrigerating apparatus which accelerates desorption / adsorption of an adsorbent by accelerating and improving the heat conduction rate in the adsorption element.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an adsorption type refrigerating apparatus according to an embodiment of the present invention.

2A and 2B are diagrams according to an embodiment of the present invention, in which FIG. 2A is a diagram showing a structure of an adsorption element, and FIGS. 2B and 2C are sectional views showing a state in which the adsorption element is fixed to a tube and fins. .

3A and 3B are diagrams related to a conventional example, FIG. 3A is a diagram showing a configuration of an adsorption type refrigerating apparatus, and FIG. 3B is a sectional view showing a tube.

FIG. 4 is a sectional view showing a tube according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Adsorption type | formula freezer 2 ... Vacuum container 3 ... Tube 4 ... Fin 6 ... Adsorption element 7 ... Heat exchanger 11 ... Adsorbent 12 ... Metal thread 13 ... Binder (adhesive) 14 ... Metal piece 51 ... Body 511 ... Body bottom surface 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

Claims (3)

[Claims] 1. An adsorption type refrigeration apparatus having a fin on the surface of a tube through which a heat medium flows inside, and an adsorption element having an adsorbent adhered to the surface of the tube and the fin, wherein the adsorption adhered to the adsorption element An adsorption type refrigerating device characterized in that a metal thread is mixed in the agent. 2. An adsorption type refrigeration apparatus having an adsorption element in which a fin is provided on the surface of a tube through which a heat medium flows, and a solid state adsorbent is adhered to the surface of the tube and the fin, the adsorption refrigeration apparatus being fixed to the adsorption element. An adsorbing type refrigerating apparatus, wherein strip-shaped metal flakes are mixed in the adsorbent. 3. The adsorption type refrigerating apparatus according to claim 1, wherein the metal thread or the metal thin piece is brought into contact with the surfaces of the tube and the fin.