JP6815067B2 - Humidity control element and humidity control device - Google Patents

Description

The present invention relates to a humidity control element and a humidity control device that absorb and desorb water vapor in the air to control humidity.

With the demand for further reduction of air conditioning energy, a latent heat / sensible heat separation air conditioning system that separately performs dehumidification and cooling is known as an air conditioning system that uses a humidity control element. In this air conditioning system, latent heat treatment, that is, humidity treatment, is performed with high efficiency by a dedicated device. Further, the microheat treatment, that is, the temperature treatment is performed in the indoor unit whose evaporation temperature has risen. As a result, energy consumption is reduced. As an example of a dedicated device for latent heat treatment, an outside air treatment device composed of an adsorption type humidity control element is known. The outside air treatment device has a pair of heat exchangers connected to the refrigeration cycle. Then, the outdoor air heat-exchanged by one heat exchanger is supplied to the room, and the indoor air heat-exchanged by the other heat exchanger is exhausted to the outside. A hygroscopic material is provided on the surface of the fins of the pair of heat exchangers. Then, the water vapor in the passing air is adsorbed on the heat exchanger side acting as an evaporator, and the water vapor in the passing air is desorbed on the heat exchanger side acting as a condenser. As a result, ventilation and humidity control are performed.

Patent Document 1 describes heat in which a hygroscopic layer containing a hygroscopic organic polymer-based sorbent is formed on the surface of metal fins constituting a heat exchanger using paper, non-woven fabric, cloth or the like as a base material. The replacement module is disclosed.

JP-A-2007-132614

However, in Patent Document 1, when the thickness of the moisture absorbing layer is increased in order to improve the water absorption performance, the particulate organic polymer-based sorbent is layered, resulting in cracking or peeling. Further, when the thickness of the moisture absorbing layer is increased, the distance between the surface of the moisture absorbing layer and the fins becomes long, so that the heat transfer performance is deteriorated. Therefore, the water absorption of the organic polymer-based sorbent is reduced.

The present invention has been made to solve the above problems, and provides a humidity control element and a humidity control device for improving the water absorption of the adsorbent.

The humidity control element according to the present invention includes a plurality of fins having a base material and an adsorbent, and a heat transfer tube inserted into the plurality of fins and allowing the refrigerant to flow inside, and the plurality of fins are separated from each other. The base material is composed of a metal porous body having a skeleton in a three-dimensional network shape, has pores formed in voids between the skeletons, and the adsorbent is attached to the skeleton of the base material. It further comprises a base that is filled in a part of the inside of the pores and is bonded to the substrate, and the substrate is bonded to the first substrate to be bonded to the base and to the outside of the first substrate. In the thickness direction, it is composed of a second base material in which the ratio of pores is larger than the ratio of pores in the first base material .

According to the present invention, the adhesion area to which the adsorbent is attached increases. Therefore, it is not necessary to increase the thickness of the adsorption unit having the base material and the adsorbent. Therefore, since the deterioration of the heat transfer performance is suppressed, the water absorption of the adsorbent can be improved.

It is a circuit diagram which shows the humidity control apparatus 2 which concerns on Embodiment 1 of this invention. It is a circuit diagram which shows the humidity control apparatus 2 which concerns on Embodiment 1 of this invention. It is a perspective view which shows the humidity control element 1 which concerns on Embodiment 1 of this invention. It is a front view which shows the fin 20 of the humidity control element 1 which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows the adsorption unit 21 of the humidity control element 1 which concerns on Embodiment 1 of this invention. It is a graph which shows the relationship between the thickness of the adsorbent 26 and the adsorbed amount in Embodiment 1 of this invention. It is a graph which shows the relationship between the volume ratio of adsorbent 26 and air of Embodiment 1 of this invention, and the amount of adsorption. It is a front view which shows the humidity control element 100 which concerns on Embodiment 2 of this invention. It is a front view which shows the fin 120 of the humidity control element 100 which concerns on Embodiment 2 of this invention.

Embodiment 1.
Hereinafter, embodiments of the humidity control element and the humidity control device according to the present invention will be described with reference to the drawings. 1 and 2 are circuit diagrams showing a humidity control device 2 according to a first embodiment of the present invention. The humidity control device 2 will be described with reference to FIGS. 1 and 2. As shown in FIGS. 1 and 2, in the humidity control device 2, the compressor 3, the four-way valve 4, the first humidity control element 1a, the expansion valve 5 and the second humidity control element 1b are connected by a pipe, and the refrigerant is connected. It is equipped with a refrigerant circuit that circulates.

The compressor 3 compresses the refrigerant. The four-way valve 4 changes the flow path of the refrigerant. The first humidity control element 1a is a heat exchanger, which acts as a condenser or an evaporator, exchanges heat between air and a refrigerant, and absorbs and desorbs moisture in the air. The expansion valve 5 expands and depressurizes the refrigerant. The second humidity control element 1b is a heat exchanger, which acts as an evaporator or a condenser, exchanges heat between air and a refrigerant, and absorbs and desorbs moisture in the air. Note that FIG. 1 shows a case where the first humidity control element 1a acts as a condenser and the second humidity control element 1b acts as an evaporator. Further, FIG. 2 shows a case where the first humidity control element 1a acts as an evaporator and the second humidity control element 1b acts as a condenser.

FIG. 3 is a perspective view showing the humidity control element 1 according to the first embodiment of the present invention. Next, the humidity control element 1 will be described. As shown in FIG. 3, the humidity control element 1 includes a plurality of fins 20 and a plurality of heat transfer tubes 10.

The plurality of fins 20 are arranged at intervals from each other, and air is flowing between the plurality of fins 20. The plurality of heat transfer tubes 10 are inserted into the fins 20 to allow the refrigerant to circulate inside. Each heat transfer tube 10 may have a structure in which the refrigerant is circulated in parallel by using a header, or may be a structure in which the refrigerant is circulated in series by using a U-shaped tube. In the first embodiment, the cylindrical heat transfer tube 10 is illustrated, but a flat heat transfer tube 10 may be used. Further, aluminum, copper, or the like is used for the heat transfer tube 10, thereby improving the heat transfer performance.

In the first embodiment, the plate fin tube type heat exchanger is illustrated as the humidity control element 1, but a corrugated fin tube type heat exchanger may also be used. Further, the number of fins 20 and the length of the heat transfer tube 10 can be appropriately changed.

FIG. 4 is a front view showing the fins 20 of the humidity control element 1 according to the first embodiment of the present invention. Next, the fin 20 will be described. As shown in FIG. 4, the fin 20 includes a base 22 and a suction unit 21. The suction unit 21 is joined to the base portion 22.

The base portion 22 is a plate-shaped member made of metal, and the material of the base portion 22 is aluminum, but any metal having high thermal conductivity such as silver, copper, aluminum alloy, copper alloy, stainless steel, etc. may be used. The thickness of the base 22 is 0.1 mm to 1.0 mm, which provides sufficient thermal conductivity and strength. A burring hole (not shown) is formed in the base 22, and the heat transfer tube 10 is inserted into the burring hole. The base portion 22 may have a flat plate shape or a structure having protrusions protruding from the surface in the thickness direction.

The adsorption unit 21 has a base material 23 and an adsorbent 26. Two suction units 21 are provided so as to sandwich the base 22 from both sides. In addition, one suction unit 21 may be provided, or three or more suction units 21 may be provided. The base portion 22 and the base material 23 of the adsorption unit 21 are joined so that the thermal resistance between the base portion 22 and the base material 23 is reduced.

FIG. 5 is a schematic view showing the adsorption unit 21 of the humidity control element 1 according to the first embodiment of the present invention. Next, the adsorption unit 21 of the humidity control element 1 will be described.

As shown in FIG. 5, the base material 23 is made of a metal porous body having a three-dimensional network-like skeleton 24. Further, the base material 23 has pores 25 formed in the gaps between the skeletons 24. The base material 23 has, for example, a three-dimensional network-like skeleton structure, and the skeleton 24 of the base material 23 is formed so as to extend in the thickness direction (arrow Y direction) of the fins 20. The base material 23 may have holes formed from the front surface to the back surface of the flat plate, such as a honeycomb structure, a corrugated structure, a multilayer mesh, and steel wool. Further, the base material 23 contains at least one of aluminum, an aluminum alloy, copper, and a copper alloy. As described above, since the base material 23 is bonded to the base portion 22, the pressure loss increases as the thickness of the base material 23 increases. Therefore, the thickness of the base material 23 is about 0.3 mm to 2.0 mm, whereby high adsorption performance can be obtained without increasing the pressure loss. The base material 23 has a ratio of a single pore 25 in the thickness direction (arrow Y direction).

For example, when the base 22 and the base material 23 are made of aluminum, a diffusion bond that pressurizes and heats in a vacuum or a rare gas, a bond by aluminum brazing, a bond by aluminum soldering, or an adhesive having high thermal conductivity. Brazing is used. A hole (not shown) is also formed in the suction unit 21, and the heat transfer tube 10 is inserted into the hole.

The adsorbent 26 is attached to the skeleton 24 of the base material 23. The adsorbent 26 is also filled in a part of the inside of the pores 25 of the base material 23. As the adsorbent 26, silica gel, zeolite, organic polymer-based material, alumina, mesoporous silica and the like are used, as long as it easily adsorbs water vapor at low temperature and easily desorbs water vapor at high temperature. Good. The particle size of the adsorbent 26 may be smaller than the diameter of the pores 25 of the base material 23. As a result, the adsorbent 26 is easily filled in a part of the inside of the pores 25.

The adsorbent 26 can adsorb more water as the amount adhered to the base material 23 increases. Here, the adsorbed water molecules diffuse from the surface of the adsorbent 26 and then move to macropores having a relatively large diameter. The water molecules then move to micropores with a diameter smaller than the macropores. Since the micropore has a small diameter, the speed at which water molecules move is slow, and adsorption and desorption are rate-determining. Further, when the amount of the adsorbent 26 adhered increases, the cost of the adsorbent 26 increases, and the weight of the humidity control element 1 also increases.

Therefore, it is preferable that the adsorbed amount of the adsorbent 26 is suppressed as much as possible, but when the adsorbed amount of the adsorbent 26 is small, the adsorbed amount of water is reduced, which makes humidity control difficult. Further, since the frequency of repeating the moisture absorption operation and the regeneration operation increases, the life of the valve (not shown) for switching the operation is shortened. Therefore, it is preferable that the humidity control element 1 adjusts the amount of the adsorbent 26 adhered to the base material 23 so that the moisture absorption operation and the regeneration operation are repeated in 5 to 30 minutes.

FIG. 6 is a graph showing the relationship between the thickness of the adsorbent 26 and the adsorbed amount in the first embodiment of the present invention. Next, the experimental results for clarifying the relationship between the thickness of the adsorbent 26 and the adsorbed amount will be described. In the experiment, the adsorbent 26 has different thicknesses of the adsorbent 26 adhered to the aluminum flat plate. Further, in the experiment, the condition is that after drying at a temperature of 120 ° C. for 16 hours to desorb moisture from the adsorbent 26, water vapor contained in the air having a temperature of 20 ° C. and a humidity of 65% is adsorbed for 10 minutes. In FIG. 6, the horizontal axis is the thickness of the adsorbent 26, and the vertical axis is the amount of water adsorbed per unit weight of the adsorbent 26.

As shown in FIG. 6, the thickness of the adsorbent 26 is about 30 μm to 130 μm, and the adsorbed amount is 0.30 g / g or more. Further, when the thickness of the adsorbent 26 is about 40 μm, the adsorbed amount shows a maximum value, and the adsorbed amount decreases regardless of whether the thickness of the adsorbent 26 is thinner or thicker. Therefore, when adsorbing for 10 minutes, the adsorbent 26 preferably has a thickness of 30 μm to 130 μm. It is more preferable that the adsorbent 26 has a thickness of 40 μm to 70 μm.

FIG. 7 is a graph showing the relationship between the volume ratio of the adsorbent 26 and air and the adsorbed amount in the first embodiment of the present invention. The adsorbent 26 is also adhered to the inside of the pores 25 of the base material 23, but if the amount of the adsorbent 26 is too large, the inside of the pores 25 is filled with the adsorbent 26 and the diffusion of air is hindered. Therefore, it is possible to utilize the surface diffusion of water by securing a certain amount of space inside the pores 25.

Next, the experimental results for clarifying the relationship between the volume ratio of the adsorbent 26 and air and the adsorbed amount will be described. In the experiment, the adsorbent 26 is attached to the inside of the pores 25, and the portion inside the pores 25 to which the adsorbent 26 is not attached is a space where air floats. Further, in the experiment, the condition is that after drying at a temperature of 120 ° C. for 16 hours to desorb moisture from the adsorbent 26, water vapor contained in the air having a temperature of 20 ° C. and a humidity of 65% is adsorbed for 10 minutes. In FIG. 7, the horizontal axis is the volume ratio obtained by dividing the volume of the adsorbent 26 by the volume of air, and the vertical axis is the amount of water adsorbed per unit weight of the adsorbent 26. Here, the air is the air inside the pores 25.

As shown in FIG. 7, the larger the volume ratio, the logarithmically the amount of adsorption increases. If the volume ratio is 4 or more, that is, the ratio of the adsorbent 26 occupying the inside of the pores 25 is 4 times or more that of air, the amount of water adsorbed per unit weight of the adsorbent 26 can be 0.30 g / g or more. .. Further, if the volume ratio is 10 or more, that is, the ratio of the adsorbent 26 occupying the inside of the pore 25 is 10 times or more that of air, the amount of water adsorbed per unit weight of the adsorbent 26 is 0.38 g / g or more. can get. If the amount of adhesion is too large, the inside of the pores 25 is filled with the adsorbent 26 and the diffusion of air is hindered, so that the amount of water adsorbed does not increase and is saturated. Therefore, when adsorbing for 10 minutes, the volume ratio is preferably 4 to 30. The volume ratio is more preferably 10 to 30.

Next, a method for manufacturing the hygroscopic element according to the first embodiment will be described. First, the base 22 and the base material 23 are joined. Next, the heat transfer tube 10 is inserted into the burring hole of the base 22 and the hole of the base material 23, and the heat transfer tube 10 is expanded, so that the heat transfer tube 10 is fixed to the base 22 and the base material 23 and heat is generated. The exchanger structure is formed. After that, the heat exchanger structure is immersed in a slurry composed of the adsorbent 26 and the binder and dip. The adsorbent 26 is attached to the heat exchanger structure by drying the dipping heat exchanger structure. That is, the adsorbent 26 is attached to the inside of the skeleton 24 and the pores 25 of the base material 23. In this way, the humidity control element 1 is manufactured.

Next, the operation of the humidity control device 2 using the humidity control element 1 according to the first embodiment will be described. First, the operation of taking dehumidified air into the room will be described with reference to FIG. 1 when the humidity of the outdoor air is high, such as in summer. In FIG. 1, the first humidity control element 1a acts as a condenser, and the second humidity control element 1b acts as an evaporator. The flow of the refrigerant is indicated by a thick arrow α. As shown in FIG. 1, the refrigerant is sucked into the compressor 3, compressed by the compressor 3, and discharged in the state of a high-temperature and high-pressure gas. The discharged refrigerant flows into the first humidity control element 1a through the four-way valve 4. The refrigerant is condensed by the first humidity control element 1a. At this time, the return air RA in the room is exhausted to the outside (dashed line arrow β).

The condensed refrigerant is expanded and depressurized by the expansion valve 5 and flows into the second humidity control element 1b in a low temperature and low pressure state. The reduced pressure refrigerant is evaporated by the second humidity control element 1b. At this time, the outdoor air OA is dehumidified by the second humidity control element 1b and supplied to the room (solid arrow γ). Specifically, the moisture in the outdoor air OA, which is moist air, is adsorbed by the adsorbent 26 of the second humidity control element 1b. At that time, since the second humidity control element 1b acts as an evaporator, the heat of adsorption generated when the moisture is adsorbed is transferred to the refrigerant. Therefore, the second humidity control element 1b can adsorb moisture without increasing the temperature. After that, the evaporated refrigerant is sucked into the compressor 3.

Next, the operation of desorbing the adsorbed water by the adsorbent 26 of the second humidity control element 1b will be described with reference to FIG. The amount of water that can be adsorbed by the adsorbent 26 of the humidity control element 1 is determined by the amount of water adsorbed on the base material 23. As described above, the adsorbent 26 has a limited amount of water that can be adsorbed. Therefore, in the humidity control element 1, it is necessary to desorb the adsorbed water and regenerate it so that the water can be adsorbed again. In FIG. 2, the first humidity control element 1a acts as an evaporator, and the second humidity control element 1b acts as a condenser. The flow of the refrigerant is indicated by a thick arrow α. As shown in FIG. 2, the refrigerant is sucked into the compressor 3, compressed by the compressor 3, and discharged in the state of a high-temperature and high-pressure gas. The discharged refrigerant flows into the second humidity control element 1b through the four-way valve 4.

The refrigerant is condensed by the second humidity control element 1b. At this time, the return air RA in the room has a relatively smaller amount of water than the outdoor air OA, which is moist air. Therefore, it is humidified by the second humidity control element 1b and exhausted to the outside (dashed line arrow β). Specifically, the moisture adsorbed on the adsorbent 26 of the second humidity control element 1b is desorbed, and the return air RA is humidified by the moisture. Here, the desorption of water involves endothermic process. Since the second humidity control element 1b acts as a condenser, the adsorbent 26 is heated and water is desorbed from the adsorbent 26. The condensed refrigerant is expanded and depressurized by the expansion valve 5 and flows into the first humidity control element 1a in a low temperature and low pressure state. The reduced pressure refrigerant is evaporated by the first humidity control element 1a. At this time, outdoor air OA is supplied to the room. After that, the evaporated refrigerant is sucked into the compressor 3.

The humidity control device 2 continuously performs ventilation and humidity control by periodically alternately switching the operations shown in FIGS. 1 and 2. That is, the humidity control device 2 continuously controls the humidity while ventilating by periodically alternately switching the flow α of the refrigerant and the flows β and γ of the air passing through the humidity control element 1.

According to the first embodiment, in the humidity control element 1, the adsorbent 26 is attached to the skeleton 24 of the base material 23 made of a metal porous body. Therefore, the adhesion area to which the adsorbent 26 is adhered increases. Therefore, it is not necessary to increase the thickness of the adsorption unit 21 having the base material 23 and the adsorbent 26. Therefore, since the deterioration of the heat transfer performance of the adsorbent 26 having a large thermal resistance is suppressed, the water absorption of the adsorbent 26 can be improved. Further, the thickness of the base material 23 becomes the thickness of the adsorption unit 21 composed of the base material 23 and the adsorbent 26 as it is.

When the adsorbent layer is directly applied to the metal base as in the conventional case, if the adsorbent layer becomes thick, cracks occur when the adsorbent layer is formed, and the adsorbent layer is uniformly formed on the base. It is difficult to do. Further, when an adsorbent layer is formed on a metal base using paper, a non-woven fabric, a cloth or the like as a base material, if the adsorbent layer becomes thicker, the heat transfer performance deteriorates and the adsorbent's ability is exhibited. I can't. On the other hand, in the first embodiment, the adhesion area to which the adsorbent 26 is adhered increases. Therefore, it is not necessary to increase the thickness of the adsorption unit 21 having the base material 23 and the adsorbent 26. Therefore, since the deterioration of the heat transfer performance is suppressed, the water absorption of the adsorbent 26 can be improved.

Further, the skeleton 24 of the base material 23 is formed so as to extend in the thickness direction of the fins 20. As a result, even if the thickness of the suction unit 21 is increased, the strength of the suction unit 21 does not decrease, and cracks are unlikely to occur. Therefore, since the adsorption unit 21 can be uniformly formed, water absorption can be ensured.

Further, the base material 23 contains at least one of aluminum, an aluminum alloy, copper, and a copper alloy. As a result, the heat exchange efficiency between the base material 23 constituting the fin 20 and the heat transfer tube 10 is improved.

Furthermore, the thickness of the adsorbent 26 is 30 μm to 130 μm. As a result, the amount of water adsorbed can be further increased.

The base material 23 has pores 25 formed in the gaps between the skeletons 24, and the adsorbent 26 is filled in a part of the inside of the pores 25 of the base material 23. The volume of the adsorbent 26 filled in a part of the inside of the pore 25 is 4 to 30 times the volume of the air inside the pore 25. As a result, the amount of water adsorbed can be further increased.

Further, the base material 23 has a ratio of a single pore 25 in the thickness direction. As a result, only one type of base material 23 is required, so that the cost can be reduced.

Further, the humidity control element 1 is further provided with a heat transfer tube 10 which is inserted into a fin 20 having a base material 23 and an adsorbent 26 and through which a refrigerant flows inside. The adsorbent 26 is attached to the skeleton 24 of the base material 23 made of a metal porous body having high thermal conductivity, and the base material 23 and the adsorbent 26 are attached to the adsorbent 26 and the heat transfer tube 10. It is connected to the base portion 22 having a larger solid volume ratio than the base material 23 before the substrate 23. Therefore, the thermal resistance between the adsorbent 26 and the refrigerant inside the heat transfer tube 10 is small. As a result, the ability of the adsorbent 26 can be fully exhibited.

Furthermore, the humidity control device 2 includes a refrigerant circuit in which the compressor 3, the first humidity control element 1a, the expansion valve 5 and the second humidity control element 1b are connected by piping, and the refrigerant flows. By using the humidity control element 1 that can improve the water absorption of the adsorbent 26, the humidity control device 2 having high water absorption performance can be realized.

Embodiment 2.
FIG. 8 is a front view showing the humidity control element 100 according to the second embodiment of the present invention. The second embodiment is different from the first embodiment in that the fin 120 includes the first suction unit 121a and the second suction unit 121b. In the second embodiment, the parts common to the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and the differences from the first embodiment will be mainly described.

As shown in FIG. 8, the fin 120 includes a base 22, a first suction unit 121a, and a second suction unit 121b.

FIG. 9 is a front view showing fins 120 of the humidity control element 100 according to the second embodiment of the present invention. As shown in FIG. 9, two first adsorption units 121a are provided so as to sandwich the base portion 22 of the central portion from both sides, and have the first base material and the adsorbent 26. Two second adsorption units 121b are provided, each of which is joined so as to sandwich the first adsorption unit 121a, and has a second base material and an adsorbent 26. In the second adsorption unit 121b, the ratio of the pores 25 of the second base material is larger than the ratio of the pores 25 of the first base material in the first adsorption unit 121a. Here, the ratio of the pores 25 is defined by the ratio of the voids to the bulk volume of the base material 23, and the higher the ratio of the pores 25, the smaller the amount of metal. That is, the larger the ratio of the pores 25, the smaller the solid volume ratio.

Next, a method for manufacturing the hygroscopic element according to the second embodiment will be described. The first base material of the first suction unit 121a and the base portion 22 are joined, and then the second base material of the second suction unit 121b is joined. The base portion 22 may have a flat plate shape or a structure having protrusions protruding from the surface in the thickness direction. When the base portion 22 has protrusions, the protrusions which are bulk bodies may be joined to the first suction unit 121a and the second suction unit 121b. Further, the base 22 may be bonded to the composite in which the first base material of the first suction unit 121a and the second base material of the second suction unit 121b are unitized. Further, by compressing a part of the region of one base material 23 to reduce the ratio of the pores 25, the base material 23 of the first adsorption unit 121a and the second adsorption unit can be used with one base material 23. A structure may be used to cover the base material 23 of 121b. The method of manufacturing the moisture absorbing element after that is the same as that of the first embodiment.

According to the second embodiment, the base portion 22 to be bonded to the base material 23 is further provided, and the base material 23 is bonded to the first base material to be bonded to the base portion 22 and to the outside of the first base material. It is composed of a second base material in which the ratio of the pores 25 in the thickness direction is larger than the ratio of the pores 25 in the first base material. As described above, the solid volume ratio of the metal is larger on the inner side than on the outer side of the fin 120. This is even more remarkable when the fin 120 includes the base 22 inside the first suction unit 121a. That is, the heat transfer performance inside the fin 120 is high. As a result, in addition to the effect of the first embodiment, the heat transfer performance of the adsorbent 26 inside the fin 120 is further enhanced, so that the adsorption performance of the adsorbent 26 can be further enhanced. Further, since the amount of the adsorbent 26 on the outside of the fin 120 is large, the moisture in the air can be sufficiently adsorbed.

In the second embodiment, the fin 120 having the first suction unit 121a and the second suction unit 121b has been described, but the number of suction units 21 is not limited to two, and may be three or more. .. Further, the same effect can be obtained even in a structure in which the suction unit 21 is not partitioned and the ratio of the pores 25 gradually increases toward the outside in the thickness direction of the fin 120. Further, the base portion 22 may be a porous body having a solid volume ratio higher than the solid volume ratio of the base material 23 of the first adsorption unit 121a.

The humidity control element 1 is not limited to the heat exchanger, and may be directly placed inside the refrigerator or indoors.

1 Humidity control element, 1a 1st humidity control element, 1b 2nd humidity control element, 2 Humidity control device, 3 Compressor, 4 Four-way valve, 5 Expansion valve, 10 Heat transfer tube, 20 fins, 21 adsorption unit, 22 Base, 23 base material, 24 skeleton, 25 pores, 26 adsorbent, 100 humidity control element, 120 fins, 121a first adsorption unit, 121b second adsorption unit.

Claims (5)

A plurality of fins having a base material and an adsorbent,
A heat transfer tube that is inserted into the plurality of fins and allows the refrigerant to flow inside is provided.
The plurality of fins are arranged apart from each other.
The base material is made of a metal porous body having a three-dimensional network-like skeleton, and has pores formed in voids between the skeletons.
The adsorbent is attached to the skeleton of the base material and is filled in a part of the inside of the pores.
Further provided with a base bonded to the substrate,
The base material is
With the first base material bonded to the base,
Humidity control which is bonded to the outside of the first base material and is composed of a second base material whose pore ratio is larger than the pore ratio in the first base material in the thickness direction. element. The base material is
The humidity control element according to claim 1, further comprising at least one of aluminum, an aluminum alloy, copper, and a copper alloy. The thickness of the adsorbent is
The humidity control element according to claim 1 or 2, which is 30 μm to 130 μm. The volume of the adsorbent filled in a part of the inside of the pores is
The humidity control element according to any one of claims 1 to 3, which is 4 to 30 times the volume of air inside the pores. Compressor, the first humidity control device according to any one of claims 1-4, the second humidity control device according to any one of the expansion valve and the claims 1-4 is connected by a pipe , A humidity control device equipped with a refrigerant circuit through which the refrigerant flows.

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