JP2004271008A - Outdoor heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outdoor heat exchanger capable of improving and stabilizing the cooling performance with a simple constitution, being easily manufactured and mass-produced, unifying the quality, having high durability, and being stabilized in its performance and maintenance. <P>SOLUTION: This outdoor heat exchanger comprises a plurality of heat conductive fins made out of aluminum or aluminum alloy, and having a coating layer at least on its one surface, a nozzle part mounted in opposition to a heat conductive fin mounting part and provided with a spray nozzle, a water pipe for supplying the water to the nozzle part, and a water supply pipe connected to the water pipe. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an outdoor heat exchanger used for an air-cooled refrigerator, an air conditioner, and the like, and more particularly, to an outdoor heat exchanger that stabilizes a cooling capacity and improves energy saving, maintainability, and durability.
[0002]
[Prior art]
Outdoor heat exchangers used in conventional air-cooled refrigerators are equipped with heat transfer fins to increase the cooling capacity of copper pipes. In addition to the sulfurous acid gas, the nitrogen oxidizing gas, the carbon dioxide gas, the acid rain, and the oxidizing particulates, corrosion is apt to occur, and even in a home cooler, spot-like corrosion occurs within three months from a new one. Dust and dust easily adhere to such a corroded portion, so that heat conduction is deteriorated, and heat transfer fins are clogged, heat radiation is hindered, and heat efficiency is deteriorated. Further, dust, floating dust, dust and the like adhering to the corroded portion of such heat transfer fins have an adhesive property and are difficult to remove, so that it is difficult to maintain the cooling performance because of poor maintainability.
As a result, air-cooled refrigerators such as frozen foods, chilled foods, chilled meat, fresh fish, prepared foods, and frozen cases used in supermarkets and other large stores lose their cooling capacity when the temperature rises in summer, etc. There was a problem that the generation would rise.
The following are solutions to these problems.
(Patent Document 1) discloses "Aluminum fin material for heat exchanger obtained by applying a surface treatment agent and a hydrophilic treatment agent to the surface of a fin material".
(Patent Document 2) discloses "an air conditioner in which cold condensed water is pressure-fed to a water pipe and blown onto fins of a heat exchanger via a nozzle".
(Patent Document 3) discloses, in an air-cooled heat exchanger that sends cooling air by a blower fan and cools fluid in a fin tube in a non-contact manner, a spray nozzle that sprays water droplets on cooling air from the blower fan to the fin tube. And an air-cooled heat exchanger provided with a heat exchanger.
[0003]
[Patent Document 1]
JP-A-2002-241963
[Patent Document 2]
JP-A-2002-5468
[Patent Document 3]
JP-A-2002-122387
[0004]
[Problems to be solved by the invention]
However, the conventional technique has the following problems.
In (1) (Patent Document 1), after a base treatment agent is applied to the surface of the fin material and dried, a hydrophilic treatment agent must be applied and dried on the base treatment agent film, so that the manufacturing process is complicated. Therefore, there is a problem that it is difficult to control and uniform the film thickness, and the productivity is poor.
In (2) (Patent Document 2), condensed water adhering to the heat exchanger and dropping during the cooling operation is collected, pumped to a water pipe by a pump, and sprayed onto fins of the heat exchanger via a nozzle. Since the condensed water can be used effectively and contains no chlorine, corrosion of the fins can be prevented, but it is necessary to store the condensed water, the structure is complicated, and it is difficult to add it to the existing heat exchanger Had issues.
In (3) (Patent Document 3), water droplets are sprayed on cooling air, and the water droplets are vaporized on the surface of the fin tube and are cooled by the latent heat. However, a blowing fan is required, and the driving of the blowing fan is required. There has been a problem that when water droplets adhere to electric components such as a motor, corrosion occurs. In addition, in order to prevent water droplets from adhering, it is necessary to control the rotation speed of the blower fan and the particle size of the water droplets, which has a problem that the configuration is complicated and cannot be easily added to an existing heat exchanger. I was
[0005]
The present invention solves the above-mentioned conventional problems, and can improve and stabilize cooling performance with a simple configuration, can be easily manufactured and mass-produced, has uniform quality, has excellent durability, and has stable performance and maintainability. It is an object to provide an outdoor heat exchanger that can be obtained.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, an outdoor heat exchanger according to the present invention has the following configuration. The outdoor heat exchanger according to claim 1 of the present invention has a configuration including a plurality of heat transfer fins made of aluminum or an aluminum alloy having at least one surface on which an adhesion layer is formed.
With this configuration, the following operation is provided.
(1) Since the heat transfer fin has a coating layer on the surface, corrosion due to acid rain or the like can be prevented without deteriorating heat conduction, and durability can be improved.
(2) Since corrosion of the heat transfer fin surface is prevented, even if dust or dust adheres to the heat transfer fin, the dust and dust are easily removed by washing with rainwater or a spray nozzle with tap water to maintain the performance. be able to.
(3) Since the heat transfer fin has an adhered layer on the surface thereof, even if it is washed with tap water, corrosion due to chlorine contained in the tap water does not occur and the heat transfer fin can be kept clean. It is possible to prevent heat from being disturbed by clogging between the fins, thereby preventing a decrease in thermal efficiency.
(4) Since it is installed on a veranda or rooftop of a building or the like and is exposed to sunlight, rain, exhaust gas, and the like, it has a coating layer, so that durability can be maintained.
[0007]
Here, examples of the adhered layer formed on the surface of the heat transfer fin include a printed layer and a coating film.
In the case of printing, offset printing, screen printing, and the like, which are generally performed on aluminum cans or other metal plates, are suitable. By forming the adhered layer by printing, the manufacturing process is simple, the yield is good, and mass production can be performed uniformly.
In the case of screen printing, pressure film printing equivalent to 5 to 10 times the thickness of offset printing is possible, and uneven coating is less likely to occur and weather resistance is excellent, but the thickness is preferably about 0.05 μm to 20 μm. If the thickness is less than 0.05 μm, uneven coating tends to occur and durability tends to decrease. If the thickness is more than 20 μm, heat radiation tends to decrease, which is not preferable.
Examples of the type of ink used for screen printing include a solvent drying type, a reaction curing type, and a thermosetting type (baking and drying type), but smoothness, adhesion, weather resistance, water resistance, and chemical resistance. For example, a thermosetting type (baking and drying type) having excellent durability is preferable. As the thermosetting (baking and drying) ink, an epoxy one-component heat-curing ink is preferable. Since it is a one-component heat-curing type, it has excellent workability and adhesion strength, so that a good adhesion layer can be formed even when secondary processing such as pressing or bending is performed.
When a coating film is formed as the coating layer, a spray coating is preferred. Thereby, it can be cheaply and easily constructed.
For both printing and coating, white or silver is desirable as the color. This makes it difficult to absorb light, heat and the like, so that the heat radiation efficiency is improved and the appearance of the device can be matched.
[0008]
When an aluminum plate is used as a heat transfer fin, it is desirable to first print on a flat aluminum plate and then to form a through hole through which a hairpin tube is inserted. Thereby, a good deposition layer can be formed.
As a method of bringing the heat transfer fin and the hairpin tube into close contact, the inside diameter of the through hole formed in the heat transfer fin is processed to be larger than the outer shape of the hairpin tube, and after inserting the hairpin tube into the heat transfer fin, mechanically There are a method in which the hairpin tube is spread and adhered to the heat transfer fin, and a method in which the inside diameter of the through hole formed in the heat transfer fin is made smaller than the outer shape of the hairpin tube, and the heat transfer fin is press-fitted.
A copper, stainless steel, or iron tube is suitably used for the hairpin tube, and the hairpin tube reciprocates between the stacked heat transfer fins in a zigzag manner and is connected to one. A copper, stainless steel, or iron tube is preferably used for the U-shaped bend connected to the end to connect the hairpin tubes together.
Note that the heat transfer fins are laminated in a horizontal direction and a vertical direction. In the case of the horizontal direction, it is sufficient that the layer to be adhered is at least on the upper surface side after the lamination. It is desirable to have a coating layer. Thus, the heat transfer fins can be effectively protected from dirt such as smoke.
[0009]
The outdoor heat exchanger according to claim 2 of the present invention is the outdoor heat exchanger according to claim 1, wherein the surface of the deposition layer contains a photocatalytic oxide and a silicone resin or silica. It has a configuration in which a layer is formed.
With this configuration, the following operation is obtained in addition to the operation of the first aspect.
(1) Due to the photocatalytic action of the photocatalytic oxide, the surface of the heat transfer fin is made hydrophilic by hydrophilizing the silicone resin or silica, thereby making it difficult to adhere dirt such as atmospheric smoke containing a large amount of hydrophobic components. In addition, attached dirt can be easily removed.
Here, the amount of the photocatalytic oxide in the surface layer is preferably present in an amount of about 10 to 80% by weight, more preferably about 20 to 50% by weight. When the surface of the heat transfer fin is irradiated with light, hydrophilicity is imparted to the silicone and silica by the action of the photocatalytic oxide present in the surface layer, and the hydrophilicity is maintained as long as the light irradiation is continued. Furthermore, even if the light irradiation is stopped once, when the light is irradiated again, the hydrophilicity is imparted again. Further, since the photocatalytic oxide decomposes pollutants, the surface of the heat transfer fin can be prevented from being stained and maintained in a clean state.
[0010]
An outdoor heat exchanger according to a third aspect of the present invention is the outdoor heat exchanger according to the first or second aspect, wherein a spray nozzle is provided so as to be opposed to an arrangement portion of the heat transfer fin. A nozzle, a water pipe for supplying water to the nozzle, and a water pipe connected to the water pipe.
With this configuration, the following operation is obtained in addition to the operation of the first or second aspect.
(1) By spraying water droplets from the front of the outdoor heat exchanger to wet the heat transfer fins, the cooling efficiency can be improved by utilizing the latent heat of evaporation of water.
(2) Spray nozzles connected to the tap water because the fins are not corroded by the chlorine contained in the tap water even if the tap water is sprayed by having the adhered layer on the heat transfer fin surface of the outdoor heat exchanger The cooling efficiency can be easily increased by simply adding
(3) The outdoor heat exchanger can be washed using water sprayed from the spray nozzle, and the performance of the outdoor heat exchanger can be maintained.
(4) By spraying water, the temperature of the outside air also decreases, so that the cooling efficiency can be increased, and the temperature rise around the outdoor heat exchanger intensively installed in a building or the like can be reduced. .
[0011]
Here, a pipe made of synthetic resin or metal is used as a pipe from a supply source of tap water to the spray nozzle. It is desirable to use a pipe made of a synthetic resin or the like as a water supply pipe from a tap water supply source to a vicinity of the heat exchanger. Thereby, the workability and the workability are excellent, so that the installation is easy, and the flow rate can be secured by making the pipeline thick. Further, the water supply pipe is branched by a three-pronged branch or the like, and a water flow pipe to the front of the heat exchanger to which the spray nozzle is connected is provided.
By using a copper pipe for the water flow pipe, a flare joint with reliable connection can be used, and water leakage and the like can be reliably prevented. The inner diameter of the water pipe is desirably about 2 mm to 6 mm. If the inside diameter is smaller than 2 mm, a sufficient flow rate cannot be obtained, and if the inside diameter is larger than 6 mm, the water pressure tends to be low, and it is not preferable to spray the entire heat exchanger. Spraying to about 10 heat exchangers with an inner diameter of about 4 mm is possible.
At this time, the spray amount is preferably about 2 L to 3 L per outdoor heat exchanger per hour. If the spray amount is less than 2 L, the effect of the latent heat of evaporation is reduced, and if it is more than 3 L, not only the utilization rate of the latent heat of evaporation is reduced, but also the number of heat exchangers capable of supplying water is reduced, which is not preferable because it is not efficient. .
[0012]
Note that a valve may be provided between the spray nozzle and the water pipe. Thus, the start and stop of spraying can be switched for each heat exchanger, and unnecessary consumption of water can be prevented. In addition, an electromagnetic valve may be used instead of a manual valve. Thus, switching between the start and stop of spraying, control of pressure and flow rate, and the like can be easily performed.
Further, when spraying is performed simultaneously on a plurality of heat exchangers, a water supply tank may be provided and water may be sprayed by pressurizing water with a compressor. This makes it possible to reduce the amount of water and efficiently spray over a wide area.
[0013]
The outdoor heat exchanger according to claim 4 of the present invention is the outdoor heat exchanger according to claim 1 or 2, wherein the outdoor heat exchanger is disposed so as to face a portion where the heat transfer fins are disposed. It has a structure provided with a sprinkler pipe having one or more sprinkler holes into which water is dropped, and a water supply pipe connected to the sprinkler pipe.
With this configuration, the following operation is obtained in addition to the operation of the first or second aspect.
(1) With a simple structure in which a water spray hole is formed in a water spray pipe and water is dropped on a heat transfer fin, cooling efficiency can be improved by utilizing latent heat of evaporation of water.
(2) Since the water is dropped, the heat transfer fins are less likely to be affected by the wind and the like than the spray, and the cooling efficiencies can be enhanced by more reliably wetting the heat transfer fins and utilizing the latent heat of evaporation of the water. Here, as the water sprinkling pipe, a pipe made of synthetic resin or a pipe made of copper, stainless steel, brass, or the like can be used. A watering hole having a diameter of about 0.5 mm to 2.5 mm, preferably about 0.5 mm to 1.0 mm is formed in this. When the diameter of the watering hole is smaller than 0.5 mm, the amount of water is small and the entire fin cannot be wet, so that sufficient latent heat of evaporation cannot be used. As the diameter becomes larger than 1.0 mm, the amount of water becomes too large. It is not preferable because there is a tendency that the use efficiency of the latent heat of evaporation is lowered and a sufficient effect cannot be obtained.
Where the number of outdoor heat exchangers is large and refrigerant pipes are concentrated, water supply holes are formed in water supply pipes and water supply pipes branched in the middle of the water supply pipes, and water is sprayed on the refrigerant pipes to generate heat of the refrigerant. May be lowered. Thereby, the cooling efficiency can be increased.
[0014]
The outdoor heat exchanger according to claim 5 of the present invention is the outdoor heat exchanger according to claim 3 or 4, further comprising an activated carbon storage pipe detachably provided in the water supply pipe. It has a configuration provided.
According to this configuration, the following operation is obtained in addition to the operation of the third or fourth aspect.
(1) Since there is an activated carbon storage pipe in the middle of the water supply pipe, chlorine contained in tap water can be removed, salt corrosion of the fins can be prevented, durability can be improved, there is little aging, and long term Performance can be maintained over time.
(2) Since the activated carbon storage tube is detachable, the activated carbon can be easily replaced, and the chlorine removing effect can be maintained.
Here, as a raw material of the activated carbon stored in the activated carbon storage tube, sawdust, charcoal, peat, coal, coconut shell and the like can be mentioned, and it is desirable to use a coconut shell having a large specific surface area. Thereby, it is excellent in dechlorination. The granular activated carbon is preferably contained in a water-permeable bag. At this time, it is desirable to provide a mesh-shaped lid at least on the downstream side of the activated carbon storage pipe, whereby the handleability is excellent, and purchase and replacement can be easily performed. The shape of the activated carbon may be granular, but may be fibrous or secondary processed. By using a fibrous material, not only is it difficult for water to pass through and clogging is difficult, but also because the fibers are alternately stacked vertically and horizontally, water passes uniformly and there is little water pressure loss, so it is efficient .
Further, a secondary processed product processed into a filter shape or a cartridge shape is easy to handle and can be easily attached to and detached from the activated carbon storage tube, so that it can be more preferably used.
By providing detachable mesh-shaped lids at both ends of the activated carbon storage tube, the activated carbon in the activated carbon storage tube can be easily exchanged and held. In addition, since the activated carbon storage pipe is detachably provided in the middle of the pipe by a method such as screwing, the entire activated carbon storage pipe in which the activated carbon is stored in advance may be replaced.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an outdoor heat exchanger according to an embodiment of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 (a) is a partially broken whole perspective view of an outdoor heat exchanger according to Embodiment 1 of the present invention, and FIG. 1 (b) is an enlarged view of a portion A in FIG. 1 (a).
In FIG. 1A, reference numeral 1 denotes an outdoor heat exchanger according to Embodiment 1 of the present invention, 1a denotes a pipe for spraying water droplets, 2 denotes a copper hairpin tube fitted into an opening of the outdoor heat exchanger 1 and a large number thereof are arranged. Heat transfer fins on which a coating layer such as printing or a coating film is formed on the surface, 3 is a copper hairpin tube, 3a is a copper bend, 4 is a nozzle portion provided with a spray nozzle, 5 is A water pipe, 6 an electromagnetic valve, 7 a branch, 8 a synthetic resin water pipe, 9 an activated carbon storage pipe disposed between the raw water side water pipes 8 and 8 for removing chlorine ions in tap water, 9a and 9b are activated carbon storage pipe connection parts.
In FIG. 1 (b), the heat transfer fins 2 have an adhesion layer 2b formed by printing or painting white or silver with a thickness of about 0.05 to 20 μm on both surfaces of an aluminum plate 2a.
The outdoor heat exchanger 1 is formed of a heat transfer fin 2, a hairpin tube 3 having a diameter of 9 mm to 20 mm, and a bend 3a. The tip of the hairpin tube 3 is connected to an indoor refrigerator or cooler by a refrigerant pipe (not shown). It is connected.
The water flowing through the water droplet spray pipe 1a reaches the nozzle part 4 provided with the spray nozzle through the water supply pipe 8, the activated carbon storage pipe 9, the branch 7, and the water pipe 5 from the upstream side as shown by the arrow. By opening the electromagnetic valve 6, water is sprayed from the spray nozzle to the heat transfer fins 2 and the hairpin tube 3. The activated carbon storage pipe 9 is detachably provided to the water supply pipe 8 by the activated carbon storage pipe connecting portions 9a and 9b, and removes chlorine in tap water with activated carbon (not shown) stored inside.
Next, the activated carbon storage tube 9 will be described.
FIG. 2 is an exploded perspective view of the water spray pipe according to Embodiment 1 of the present invention.
In FIG. 2, 9 is an activated carbon storage tube, 10 is a lid detachably screwed to both ends of the activated carbon storage tube 9, 10a is a lid screw portion, 10b is an activated carbon storage tube connection portion 9a, 9b. The connection screwing portion 10 c to be screwed is a mesh portion provided on the end surface of the lid 10. Since the lid 10 is detachably screwed to both ends of the activated carbon storage tube 9, the activated carbon can be easily replaced. In addition, since the mesh 10c is provided on the end face of the lid 10, even when granular activated carbon is used, the activated carbon does not flow out of the activated carbon storage tube 9. Note that the mesh portion 10c may be at least on the downstream side.
Spraying water droplets can be expected to improve the cooling efficiency by lowering the temperature around the outdoor heat exchanger in addition to the effect of latent heat of vaporization.In particular, multiple outdoor heat exchangers such as the rooftop of a building are installed. In addition, it is possible to reduce a rise in temperature in a place where the refrigerant pipes are concentrated.
[0016]
Since the outdoor heat exchanger according to Embodiment 1 is configured as described above, it has the following operation.
(1) Since the heat transfer fin has a coating layer on the surface, corrosion due to acid rain or the like can be prevented without deteriorating heat conduction, and durability can be improved.
(2) Since corrosion of the heat transfer fin surface is prevented, even if dust or dust adheres to the heat transfer fin, the dust and dust are easily removed by washing with rainwater or a spray nozzle with tap water to maintain the performance. be able to.
(3) Since the heat transfer fin has an adhered layer on the surface thereof, even if it is washed with tap water, corrosion due to chlorine contained in the tap water does not occur and the heat transfer fin can be kept clean. It is possible to prevent heat from being disturbed by clogging between the fins, thereby preventing a decrease in thermal efficiency.
(4) Since it is installed on a veranda or rooftop of a building or the like and is exposed to sunlight, rain, exhaust gas, and the like, it has a coating layer, so that durability can be maintained.
(5) Since the adhered layer of the heat transfer fin is formed by printing or coating, the manufacturing process is simple, the yield is good, and mass production can be performed uniformly.
(6) By spraying water droplets from the front of the outdoor heat exchanger and wetting the heat transfer fins and the hairpin tube, the cooling efficiency can be improved by utilizing the latent heat of evaporation of water.
(7) By spraying water, the temperature of the outside air is also reduced, so that the cooling efficiency can be increased, and the temperature rise around the outdoor heat exchanger intensively installed in a building or the like can be reduced. .
(8) Since there is an activated carbon storage pipe in the middle of the water supply pipe, chlorine contained in tap water can be removed, salt corrosion of the fins can be prevented, durability can be improved, there is little aging, and long term Performance can be maintained over time.
(9) Since the activated carbon storage tube is detachable, the activated carbon can be easily replaced, and the chlorine removing effect can be maintained.
[0017]
(Embodiment 2)
FIG. 3A is an overall perspective view of the outdoor heat exchanger according to Embodiment 1 of the present invention, and FIG. 3B is an enlarged view of a portion A in FIG. 3A.
Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
In FIG. 3 (a), 11 is an outdoor heat exchanger according to Embodiment 2 of the present invention, 11a is a pipe for dropping water drops, and 12 is a transmission layer in which an adhered layer such as printing or a coating film is formed and stacked vertically. Thermal fins, 13 is a copper hairpin tube, 14 is a synthetic resin or metal sprinkler tube, 15 is a sprinkler tube 14 having a diameter of about 0.5 mm to 1.0 mm formed on the side opposite to the heat transfer fins 12. The sprinkler hole 16 is a faucet valve.
In FIG. 3B, the heat transfer fin 12 has an adhered layer 12b having a thickness of about 0.05 μm to 20 μm formed on the upper surface of the aluminum plate 12a.
The water flowing through the water dropping pipe 11a reaches the sprinkling hole 15 formed in the sprinkling pipe 14 through the water supply pipe 8, the activated carbon storage pipe 9, the branch 7, and the sprinkling pipe 14 from the upstream side as indicated by the arrow. . By opening the valve 16, water is dropped from the water spray holes 15 to the heat transfer fins 12.
[0018]
As described above, the outdoor heat exchanger according to the second embodiment is configured, and thus has the following operation in addition to the first embodiment.
(1) With a simple structure in which a water spray hole is formed in a water spray pipe and water is dropped on a heat transfer fin, cooling efficiency can be improved by utilizing latent heat of evaporation of water.
(2) Since water is dropped, it is less susceptible to wind and the like than spraying, so that the heat transfer fins can be more reliably wetted and the cooling efficiency can be increased by utilizing the latent heat of evaporation of water.
[0019]
【Example】
Hereinafter, examples of the present invention will be described.
(Example 1)
Ten aluminum plates were prepared by cutting an aluminum can having a printed layer on the surface into 2 cm in width and 8 cm in length. Holes for the hairpin tube 3 were made, and 10 places were attached to an outdoor heat exchanger.
A sprinkling pipe containing activated carbon is installed in the middle of the pipe so as to face the heat transfer fins, and tap water without chlorine is sprinkled. No corrosion occurs even after 5 years. I understood.
It was also found that no corrosion occurred even after 10 years in normal use.
(Example 2)
A bag-like form was used for the heat transfer fins of the outdoor heat exchanger of the home cooler, which had a silver coating formed by spraying, and the case where five aluminum plates of the same size as in Example 1 were attached to the outdoor heat exchanger. It was used while spraying water from which chlorine had been removed through a pipe containing activated carbon.
After one year, no corrosion occurred in either of them. After two years, slight corrosion occurred in the silver coated film formed, but it was found that no corrosion occurred in the aluminum plate having the printed layer.
In addition, the bag-shaped activated carbon was easy to purchase and handle, and could be easily replaced.
(Comparative example)
When an aluminum plate without printing or coating was used as a heat transfer fin and operated under the same conditions, black spots appeared in about 3 months, and clogging between the heat transfer fins occurred in about 3 years, resulting in a decrease in thermal efficiency. . The ones installed near the coast were corroded and ragged in about six years.
(Example 3)
FIG. 4 is an overall plan view showing the arrangement of the outdoor heat exchanger and the pipe for spraying water droplets in the third embodiment.
In the figure, 21 is an outdoor heat exchanger arranged on the roof, 21a is a fan, and 22 is a water spray pipe. The outdoor heat exchanger 21 is connected to an air-cooled refrigerator having an output of about 3.75 to 15 kW, and a hairpin tube (not shown) of the outdoor heat exchanger 21 is connected to a refrigerant pipe (not shown). I have.
A spray-type silver coating is sprayed three times on aluminum heat transfer fins, and water with chlorine removed by activated carbon stored in a pipe of about 100 mm in diameter and about 600 mm in length is sprayed on these outdoor heat exchangers. did.
As a result, it was found that the power consumption can be reduced by about 40,000 kW per month and about 400,000 kW per year, and the electric bill can be reduced by about 10 million yen.
Inspection after one year showed that no corrosion occurred on the aluminum heat transfer fins, and that activated carbon was effective for two years.
[0020]
【The invention's effect】
As described above, according to the outdoor heat exchanger of the present invention, the following advantageous effects can be obtained.
According to the first aspect of the present invention, the following effects are provided.
(1) To provide an outdoor heat exchanger having excellent reliability and durability capable of preventing corrosion due to acid rain or the like and improving durability by having an adhesion layer on the surface of the heat transfer fin without deteriorating heat conduction. be able to.
(2) Since corrosion of the heat transfer fin surface is prevented, even if dust or dust adheres to the heat transfer fin, the dust and dust are easily removed by washing with rainwater or a spray nozzle with tap water to maintain the performance. It is possible to provide an outdoor heat exchanger which is excellent in reliability and maintainability.
(3) Since the heat transfer fin has an adhered layer on the surface thereof, even if it is washed with tap water, corrosion due to chlorine contained in the tap water does not occur and the heat transfer fin can be kept clean. It is possible to provide an outdoor heat exchanger excellent in reliability and maintainability that can prevent the fins from being clogged and hinder heat radiation and prevent a decrease in thermal efficiency.
(4) It is installed on the veranda or rooftop of a building or the like, and has a deposition layer even if it is exposed to sunlight, rain, exhaust gas, etc., so it can maintain durability and has excellent reliability and durability. An outdoor heat exchanger can be provided.
[0021]
According to the second aspect of the present invention, the following effects are obtained in addition to the effects of the first aspect.
(1) Due to the photocatalytic action of the photocatalytic oxide, the surface of the heat transfer fin is made hydrophilic by hydrophilizing the silicone resin or silica, thereby making it difficult to adhere dirt such as atmospheric smoke containing a large amount of hydrophobic components. In addition, attached dirt can be easily removed.
[0022]
According to the third aspect of the invention, the following effects are obtained in addition to the effects of the first or second aspect.
(1) Outdoor heat exchanger An outdoor heat exchanger that excels in energy saving by spraying water droplets from the front and wetting the heat transfer fins and hairpin tubes to utilize the latent heat of evaporation of water to increase cooling efficiency. Can be provided.
(2) Spray nozzles connected to the tap water because the fins are not corroded by the chlorine contained in the tap water even if the tap water is sprayed by having the adhered layer on the heat transfer fin surface of the outdoor heat exchanger It is possible to provide an outdoor heat exchanger excellent in reliability and energy saving that can easily increase the cooling efficiency simply by adding the heat exchanger.
(3) Outdoor heat exchangers that can clean outdoor heat exchangers using rainwater or water sprayed from spray nozzles, maintain the performance of outdoor heat exchangers, and have excellent reliability and maintainability. Can be provided.
(4) Since the temperature of the outside air is lowered by spraying the water, it is possible to provide an outdoor heat exchanger that can improve the cooling efficiency and is excellent in energy saving.
[0023]
According to the fourth aspect of the invention, the following effect is obtained in addition to the effect of the second or third aspect.
(1) Outdoor heat with excellent workability and energy saving that can improve cooling efficiency by using the latent heat of vaporization of water by a simple structure of drilling water spray holes in water spray pipes and dropping water on heat transfer fins. An exchanger can be provided.
(2) Since water is dropped, it is less susceptible to the effects of wind and the like than spraying, so that the heat transfer fins can be more reliably wetted and the cooling efficiency can be improved by utilizing the latent heat of evaporation of water. An outdoor heat exchanger having excellent performance can be provided.
[0024]
According to the fifth aspect of the invention, the following effects are obtained in addition to the effects of the third or fourth aspect.
(1) Since there is an activated carbon storage pipe in the middle of the water supply pipe, chlorine contained in tap water can be removed, salt corrosion of the fins can be prevented, durability can be improved, there is little aging, and long term It is possible to provide an outdoor heat exchanger having excellent reliability and durability capable of maintaining performance over a long period of time.
(2) Since the activated carbon storage tube is detachable, it is possible to easily replace the activated carbon and provide an outdoor heat exchanger excellent in reliability and maintainability capable of maintaining the chlorine removing effect.
[0025]
[Brief description of the drawings]
FIG. 1A is a partially cutaway perspective view of an outdoor heat exchanger according to Embodiment 1 of the present invention.
(B) Enlarged view of section A in FIG.
FIG. 2 is an exploded perspective view of a water spray pipe according to the first embodiment of the present invention.
FIG. 3A is an overall perspective view of an outdoor heat exchanger according to Embodiment 2 of the present invention.
(B) Enlarged view of part B in FIG.
FIG. 4
Overall plan view showing an arrangement of an outdoor heat exchanger and a pipe for spraying water droplets in Embodiment 4.
[Explanation of symbols]
1 outdoor heat exchanger
1a Pipe for water spray
2 Heat transfer fins
2a Aluminum plate
2b Deposition layer
3 Hairpin tube
3a bend
4 Nozzle part
5 water pipe
6. Electromagnetic valve
7 branch
8 Water pipe
9 activated carbon storage tube
9a, 9b Activated carbon storage pipe connection
10 Lid
10a Screw part of lid
10b Connection screw connection
10c mesh
11 Outdoor heat exchanger
11a Pipe for dropping water drops
12 Heat transfer fins
12a Aluminum plate
12b deposition layer
13 Hairpin tube
14 watering pipe
15 Watering hole
16 faucet valve
21 Outdoor heat exchanger
21a fan
22 Piping for spraying water droplets

Claims (5)

An outdoor heat exchanger comprising a plurality of heat transfer fins made of aluminum or an aluminum alloy having at least one surface on which an adhesion layer is formed. The outdoor heat exchanger according to claim 1, wherein a surface layer containing a photocatalytic oxide and a silicone resin or silica is formed on a surface of the coating layer. A nozzle portion provided with a spray nozzle disposed opposite to the arrangement portion of the heat transfer fins, a water pipe for supplying water to the nozzle portion, and a water supply pipe connected to the water pipe. The outdoor heat exchanger according to claim 1, further comprising: A sprinkler pipe arranged opposite to the heat transfer fin disposition portion and having one or more sprinkling holes for dropping water to the heat transfer fins; and a water supply pipe connected to the sprinkler pipe. The outdoor heat exchanger according to claim 1 or 2, wherein: 5. The outdoor heat exchanger according to claim 3, further comprising an activated carbon storage pipe that is detachably provided in the middle of the water supply pipe. 6.

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