JP2020134044A - Outdoor unit cooling auxiliary device and outdoor unit cooling auxiliary method - Google Patents

Abstract

To provide an outdoor unit cooling auxiliary device capable of ensuring a sufficient amount of water while preventing scale from attaching to a heat exchanger and saving power consumption.SOLUTION: Antimicrobial-treated water piping 2A with a first feed pump 4A installed in the middle of the same is connected to: a secondary side of an antimicrobial pretreatment filter 3; and a primary side of a reverse osmosis membrane device 5. Mixed water piping 2B with a second feed pump 4B installed therein is connected to a secondary side (permeation side) of the reverse osmosis membrane device 5. The mixed water piping 2B also has flexible piping 2C at an end thereof connected to a spray nozzle 6 as water spraying means. The antimicrobial-treated water piping 2A also has bypass piping 2D which is merged into the mixed water piping 2B and has a control valve 11 controlling a flow rate therein.SELECTED DRAWING: Figure 1

Description

The present invention relates to an outdoor unit cooling assisting device and an outdoor unit cooling assisting method that improve the heat dissipation characteristics of a heat exchanger of an outdoor unit for a cooling device installed outdoors and enable labor saving in the entire cooling device.

As the average temperature rises due to global warming, the installation of air conditioning facilities is becoming widespread all over the world. As part of measures to prevent global warming, measures have been taken to ban the use of fluorocarbon-based refrigerants. However, the alternative heat medium has a low heat exchange rate, consumes a large amount of energy for the effective functioning of air conditioning, and there is a concern that it will promote global warming.

Generally, the cooling device has a mechanism in which an outdoor unit is installed outdoors, the heat medium dissipates heat through the heat exchanger of the outdoor unit, and the cold heat is released by the indoor air conditioner. Therefore, the heat dissipation characteristics of the heat exchanger greatly affect the operating efficiency of the entire cooling device.

In urban office buildings, etc., a large number of outdoor units are installed densely in a limited rooftop space, and when they are exposed to the sun, the temperature of the heat exchanger itself of each outdoor unit and the temperature around the outdoor unit There was a concern that the heat dissipation characteristics of the heat exchanger would deteriorate due to the rise in air temperature.

Therefore, conventionally, in order to improve the heat dissipation characteristics of the heat exchanger of the outdoor unit, a cooling auxiliary device for cooling the heat exchanger of the outdoor unit has been used (for example, Patent Document 1). This cooling auxiliary device sprinkles water toward the heat exchanger and cools the heat exchanger itself to improve heat dissipation and improve the operating efficiency of the entire cooling device.

This cooling aid sprinkled tap water directly toward the heat exchanger. By repeating watering and stopping, the evaporation and drying of water causes scale (scale) consisting of components such as calcium, magnesium, and silica contained in tap water to adhere to the heat exchanger, and the performance of the heat exchanger is impaired. was there. In addition, oxidizing substances such as chlorine components contained in tap water may cause corrosion of the material of the heat exchanger.

Therefore, a means for generating reverse osmosis membrane permeable water (hereinafter referred to as RO water) from the supplied water by a reverse osmosis membrane (reverse osmosis membrane) device is provided in the cooling auxiliary device, and the RO water is directed to the heat exchanger of the outdoor unit. Those that are sprayed have been proposed (Patent Documents 2 and 3).

Japanese Unexamined Patent Publication No. 2000-65409 Japanese Patent No. 5896331 JP-A-2016-205703

However, in the techniques described in Patent Documents 2 and 3, scale adhesion to the heat exchanger is suppressed, but scale is generated in the reverse osmosis membrane or the reverse osmosis membrane permeable water is purified depending on the quality of the raw water. Therefore, fouling due to microorganisms may occur, so maintenance must be performed frequently.

Moreover, a large amount of sprayed water is required when the temperature rises, but in the techniques described in Patent Documents 2 and 3, the amount of water that can be sprayed on the heat exchanger of the outdoor unit is rate-determined by the amount of permeated water of the reverse osmosis membrane. Therefore, it is necessary to operate the reverse osmosis membrane device at a high operating rate so that the sprayed water is not insufficient. Further, when cooling the heat exchangers of a large or large number of outdoor units as in a large commercial facility, it is necessary to install a large number of spraying devices, and it is necessary to provide a plurality of reverse osmosis membrane devices. However, the reverse osmosis membrane device consumes a large amount of power, and the electricity charge is generally a combination of a basic charge for each peak electric energy and a pay-as-you-go charge based on the amount of electricity used. If the number of installed units increases, the basic charge itself will increase if the amount of electricity exceeds the contracted amount, so the original idea is to improve the efficiency of the cooling device by cooling the heat exchanger of the outdoor unit and obtain a power saving effect. There is a problem that it impairs the purpose.

In this way, conventionally, while preventing scale from adhering to the heat exchanger and fouling by microorganisms on the spray nozzle, power consumption is suppressed and a sufficient amount of water is secured to secure a sufficient amount of water for the outdoor unit. It has been desired to cool the heat exchanger.

The present invention has been made in view of the above problems, and is an outdoor unit cooling assist that can suppress power consumption and secure a sufficient amount of water for cooling while preventing scale from adhering to the heat exchanger. An object of the present invention is to provide an apparatus and an outdoor unit cooling assisting method using the apparatus.

In view of the above object, first, the present invention is an outdoor unit cooling auxiliary device that cools the heat exchanger of the outdoor unit when the cooling device that combines the indoor unit and the outdoor unit is operated. The heat exchanger is a reverse permeable membrane device to be treated, a bypass mechanism that mixes the water to be treated with the permeated water of the reverse permeable membrane device, and a mixed water of the permeated water of the back permeable membrane device and the water to be treated. Provided is an outdoor unit cooling auxiliary device provided with a sprinkling means for sprinkling water (Invention 1).

According to the present invention (Invention 1), first, by treating the water to be treated with a reverse osmosis membrane device, permeated water from which the scale component has been removed can be obtained. Here, the amount of reverse osmosis membrane permeated water depends on the performance of the reverse osmosis membrane device, and if the required amount increases, the load must be increased or the supply must be insufficient. Therefore, by mixing the water to be treated with the permeated water of the reverse osmosis membrane device via the bypass mechanism, it is possible to secure a sufficient amount of water by making the mixed water having an appropriately reduced scale component. Then, by sprinkling the mixed water on the heat exchanger, the reverse osmosis membrane device can be efficiently operated to obtain an outdoor unit cooling auxiliary device with reduced power consumption.

In the above invention (Invention 1), the bypass mechanism includes a flow rate adjusting means and also includes an electric conductivity meter and a flow meter for the permeated water of the reverse osmosis membrane device, and the measurement is performed by the electric conductivity meter and the flow meter. It is preferable that the bypass flow rate of the water to be treated can be adjusted based on the values of the electric conductivity and the flow rate of the permeated water of the reverse osmosis membrane device (Invention 2). In particular, in the above invention (Invention 2), the electric conductivity of the mixed water is preferably 10 to 40 μS / cm (Invention 3).

According to the inventions (Inventions 2 and 3), the electric conductivity of the mixed water is 10 to 40 μS / cm, which is a water quality at which scale is unlikely to occur, based on the electric conductivity and the flow rate of the permeated water of the reverse osmosis membrane device. The bypass flow rate of the water to be treated can be adjusted so as to be.

In the above inventions (Inventions 1 to 3), a flow path opening / closing mechanism is provided between the reverse osmosis membrane device and the water sprinkling means, and a pressure accumulator type buffer tank is connected upstream of the flow path opening / closing mechanism. Therefore, it is preferable that the mixed water of the permeated water of the reverse osmosis membrane device and the water to be treated can be stored in the accumulator type buffer tank by closing the flow path opening / closing mechanism (Invention 4).

According to the present invention (Invention 4), the flow path opening / closing mechanism is closed, the mixed water is temporarily stored in the accumulator type buffer tank, and then the flow path opening / closing mechanism is opened to efficiently and stably sprinkle the water. Can be supplied with mixed water. Further, by closing the flow path opening / closing mechanism and opening the accumulator type buffer tank, it is possible to use the water for cleaning the reverse osmosis membrane device.

In the above inventions (Inventions 1 to 4), an antibacterial pretreatment filter is provided in front of the reverse osmosis membrane device, and the water to be treated by the reverse osmosis membrane device is the treated water of the antibacterial pretreatment filter. It is preferable that there is (Invention 5).

According to the present invention (Invention 5), the antibacterial pretreatment filter can stably exert the antibacterial treatment of the raw water by removing impurities and the like in the raw water and gradually releasing silver ions. Since the reverse osmosis membrane permeated water is clean, fouling is likely to occur. Therefore, the treated water of the antibacterial pretreatment filter is mixed with the permeated water of the reverse osmosis membrane device via the bypass mechanism, and the mixed water imparted with antibacterial properties is sprinkled on the heat exchanger to sprinkle the watering means. It is possible to prevent microorganisms from being generated in the water and clogging the water, the frequency of maintenance is low, and the outdoor unit cooling can be conveniently continued for a long period of time.

Secondly, the present invention is an outdoor unit cooling assisting method for cooling the heat exchanger of the outdoor unit of a cooling device that combines an indoor unit and an outdoor unit, wherein a part of the water to be treated is a reverse osmosis film. An outdoor unit that is treated by the device and mixes the permeated water of the reverse osmosis membrane device with at least a part of the residual water to be treated, and the mixed water obtained by the mixing is sprinkled on the heat exchanger by sprinkling means. A cooling assisting method is provided (Invention 6).

According to the present invention (Invention 6), first, by treating the water to be treated with a reverse osmosis membrane device, permeated water from which the scale component has been removed can be obtained. Here, the amount of reverse osmosis membrane permeated water depends on the performance of the reverse osmosis membrane device, and if the required amount increases, the load must be increased or the supply must be insufficient. Therefore, by mixing the water to be treated with the permeated water of the reverse osmosis membrane device via the bypass mechanism, it is possible to secure a sufficient amount of water by making the mixed water having an appropriately reduced scale component. Then, by sprinkling the mixed water on the heat exchanger, the reverse osmosis membrane device can be efficiently operated to obtain an outdoor unit cooling auxiliary device with reduced power consumption.

In the above invention (Invention 6), it is preferable that there are a plurality of outdoor units of the cooling device, and water is sprinkled on the heat exchangers of the plurality of outdoor units (Invention 7).

According to the present invention (Invention 7), a sufficient amount of mixed water having an appropriately reduced scale component can be secured, and the number and operating rate of the reverse osmosis membrane devices can be suppressed, so that a large amount of water can be sprinkled. It is suitable for cooling the outdoor unit by a plurality of sprinkling means.

According to the present invention, the mixed water obtained by mixing the permeated water treated with the reverse osmosis membrane apparatus with the water to be treated can be sprinkled on the heat exchanger, so that the mixed water having an appropriately reduced scale component can be sufficiently used. Since the amount of water can be secured, by sprinkling this mixed water on the heat exchanger, it is possible to efficiently operate the reverse osmosis membrane device and obtain an outdoor unit cooling auxiliary device with reduced power consumption. it can.

It is the schematic which shows the outdoor unit cooling auxiliary apparatus by one Embodiment of this invention. It is the schematic which shows the initial process at the time of the outdoor unit cooling assistance of the outdoor unit cooling assistance method by the outdoor unit cooling assistance device of the said embodiment. It is a schematic diagram which shows the execution process at the time of the outdoor unit cooling assistance of the outdoor unit cooling assistance method by the outdoor unit cooling assistance device of the said embodiment. It is the schematic which shows the initial process at the time of stopping at the time of the outdoor unit cooling assistance of the outdoor unit cooling assistance method by the outdoor unit cooling assistance device of the said embodiment. It is a schematic diagram which shows the completion process at the time of stopping at the time of the outdoor unit cooling assistance of the outdoor unit cooling assistance method by the outdoor unit cooling assistance device of the said embodiment. It is the schematic which shows the initial process of the backwashing process of the antibacterial pretreatment filter by the outdoor unit cooling auxiliary device of the said embodiment. It is a schematic diagram which shows the execution process of the backwashing process of the antibacterial pretreatment filter by the outdoor unit cooling auxiliary device of the said embodiment. It is a graph which shows the relationship between the outside air temperature and the electric energy in the outdoor unit cooling auxiliary apparatus of Example 1 and Comparative Example 1. It is a graph which shows the relationship between the outside air temperature and the electric energy in the outdoor unit cooling auxiliary apparatus of Example 2 and Comparative Example 2.

Hereinafter, an embodiment of the outdoor unit cooling assist device of the present invention will be described in detail with reference to the accompanying drawings.

[Outdoor unit cooling auxiliary device]
In FIG. 1, in the outdoor unit cooling auxiliary device 1, a supply pipe 2 for supplying raw water W from a water supply source (not shown) communicates with the primary side of the antibacterial pretreatment filter 3, and the antibacterial pretreatment filter 3-2 An antibacterial treated water pipe 2A provided with a first water pump 4A is connected to the next side on the way, and this antibacterial treated water pipe 2A is connected to the primary side of the reverse osmosis membrane device 5. Further, a mixed water pipe 2B provided with a second water pump 4B is connected to the secondary side (permeation side) of the reverse osmosis membrane device 5, and a spray valve 6A is provided on the terminal side of the mixed water pipe 2B. The external pipe 2C is connected here. A spray nozzle 6 as a watering means is connected to the external pipe 2C. In this embodiment, the external pipe 2C is made of a flexible resin such as a polyolefin resin tube. The antibacterial treated water pipe 2A is provided with a bypass pipe 2D that joins the mixed water pipe 2B, and the bypass pipe 2D is provided with a control valve 11 that controls the flow rate of the liquid passing through the bypass pipe 2D. Has been done. Further, an electric conductivity meter and a flow meter (not shown) of the permeated water W2 of the reverse osmosis membrane device 5 are provided on the upstream side of the confluence of the bypass pipe 2D of the mixed water pipe 2B, and the reverse osmosis By adjusting the control valve 11 with a control device such as a personal computer (not shown) based on the values of the electric conductivity and the flow rate of the permeated water W2 of the membrane device 5, the bypass of the treated water W1 of the antibacterial pretreatment filter is performed. The flow rate can be adjusted.

In the outdoor unit cooling auxiliary device 1 as described above, the water storage pipe 21 communicating with the accumulator type buffer tank 7 is connected to the mixed water pipe 2B, and the accumulator type buffer tank 7 is a reverse with an opening / closing valve 12. It communicates with the antibacterial treated water pipe 2A via the washing pipe 22. Reference numeral 13 denotes a drain valve provided in the drain pipe 23 of the raw water W, 14 is an opening / closing valve provided in the concentrated water discharge pipe 24 of the reverse osmosis membrane device 5, and 15 is a reverse osmosis membrane device 5. An on-off valve provided in the return pipe 25 for returning the concentrated water to the antibacterial treated water pipe 2A.

(Antibacterial pretreatment filter 3)
The antibacterial pretreatment filter 3 is not limited as long as the raw water W can be antibacterial, but a filter material made of fibrous activated carbon impregnated with silver ions is preferable as the antibacterial component.

(Spray nozzle 6)
The spray nozzle 6 has a spray capacity of, for example, about 100 mL / min or less, particularly about 30 to 60 mL / min. It is preferable that about 5 to 10 spray nozzles 6 are installed in the heat exchanger of one outdoor unit, for example. Therefore, the required number of spray nozzles 6 may be attached to the external pipe 2C for use.

[How to operate the outdoor unit cooling auxiliary device]
(When assisting cooling of the outdoor unit)
The outdoor unit cooling assist method by the outdoor unit cooling assist device 1 of the present embodiment having the above-described configuration will be described.

First, as shown in FIG. 2, the control valve 11 and the on-off valve 15 are opened, and the first pump 4A and the second pump are in a state where the drain valve 13, the on-off valve 12, 14 and the spray valve 6A are closed. Drive 4B. As a result, the raw water W is circulated in the supply pipe 2, and the raw water W supplied to the antibacterial pretreatment filter 3 is subjected to antibacterial treatment by adding an antibacterial substance (silver ion) as it passes through the antibacterial pretreatment filter 3. It becomes the water to be treated W1 of the reverse osmosis membrane apparatus 5 in which microorganisms are reduced. The silver ion concentration in the water to be treated W1 is preferably 5 to 300 ppb, more preferably 10 to 30 ppb.

The water to be treated W1 is treated by the reverse osmosis membrane device 5 to remove scale-causing ions such as fine particles, calcium, silica, and carbonate ions, metal ions, and antibacterial substances (silver ions). Pure water) W2. The electric conductivity of the permeated water W2 of the reverse osmosis membrane device 5 is generally about 5 to 10 μS / cm. At this time, since the concentrated water W4 of the reverse osmosis membrane device 5 contains an antibacterial substance (silver ion), it is returned from the return pipe 25 to the antibacterial treated water pipe 2A.

The reverse osmosis membrane device 5 used in the outdoor unit cooling auxiliary device 1 is 180 L / hr when cooling the heat exchangers of a plurality of outdoor units, assuming that 60 spray nozzles 6 having a spray capacity of 50 mL / min are operated. The capacity of the reverse osmosis membrane apparatus 5 is insufficient, and it may be difficult to secure a sufficient amount of sprayed water. On the other hand, since the antibacterial pretreatment filter 3 only passes the raw water W, the water to be treated W1 itself can be provided abundantly. Therefore, the mixed water W3 is produced by merging the water to be treated W1 containing an antibacterial substance (silver ion) with the permeated water W2 from the bypass pipe 2D.

If the amount of water to be treated W1 to be merged at this time is too small, not only a sufficient amount of water cannot be secured, but also an antibacterial substance (silver ion) is small, so that the effect of improving the slime tendency is not sufficient. On the other hand, if the amount of water to be treated W1 to be merged is too large, the amount of substances that cause scales contained in the water to be treated W1 becomes too large, and scale is likely to occur in the spray nozzle 6. Therefore, in the present embodiment, the electric conductivity of the permeated water W2 and the electric conductivity of the permeated water W2 are measured by an electric conductivity meter and a flow meter (not shown) provided upstream from the confluence of the bypass pipe 2D of the mixed water pipe 2B. Measure the flow rate. The electrical conductivity and flow rate data are input to a control device (not shown). Then, the opening degree of the control valve 11 is adjusted by the control device so that both the generation of slime and the tendency of scale are suitable. Specifically, the electric conductivity of the mixed water W3 is preferably 10 to 40 μS / cm, and particularly preferably 10 to 25 μS / cm. The permeated water W2 of the reverse osmosis membrane device 5 having an electric conductivity of 5 to 10 μS / cm is mixed with the permeated water W2 by mixing the water to be treated W1 so that the electric conductivity becomes 10 to 40 μS / cm. Water W3 can be increased by 10-50%, especially 10-30%. As a result, it is possible to obtain a power reduction effect of 5 to 30%, particularly 10 to 20%, as compared with the case where the same amount of water is supplied only by the reverse osmosis membrane device 5.

Since the spray valve 6A is closed, the mixed water W3 produced in this way is stored in the accumulator buffer tank 7 from the water storage pipe 21. Then, after the mixed water W3 is stored in the accumulator type buffer tank 7 to some extent, the mixed water W3 is discharged from the accumulator type buffer tank 7 by opening the spray valve 6A as shown in FIG. 3, and the outdoor unit for the cooling device is discharged. The mixed water W3 can be sprayed from the spray nozzle 6 toward the heat exchanger. Then, by evaporating the sprayed mixed water W3, the surrounding air is cooled, and heat exchange by the air of the outdoor unit for the cooling device can be made more efficient.

(When the outdoor unit cooling assist device 1 is stopped)
When the outdoor unit cooling assist device 1 is stopped, the spray valve 6A is closed and the control valve 11 is closed as shown in FIG. 4, and the operation of the reverse osmosis membrane device 5 is continued. As a result, the permeated water (pure water) W2 is stored in the accumulator buffer tank 7 as it is. Therefore, when a predetermined amount of the permeated water (pure water) W2 is accumulated, the operation of the reverse osmosis membrane device 5 is stopped.

Next, as shown in FIG. 5, the on-off valve 15 is closed, the on-off valve 12 and the on-off valve 14 are opened, and the first pump 4A is driven to drive the permeated water W2 to the primary of the reverse osmosis membrane device 5. Supply to the side. It is preferable that the membrane surface on the primary side of the reverse osmosis membrane device 5 is cleaned thereby to prevent the generation of scale at the time of stopping. The cleaning drainage W5 at this time is discharged from the concentrated water discharge pipe 24. After that, the drain valve 13 may be opened to discharge the accumulated water W6 of the supply pipe 2.

(Backwash method of antibacterial pretreatment filter 3)
Subsequently, a cleaning method (backwashing method) of the antibacterial pretreatment filter 3 when the antibacterial pretreatment filter 3 is used as in the present embodiment will be described. First, as shown in FIG. 6, the control valve 11 is opened, and the on-off valve 12, the drain valve 13, the on-off valve 14, the on-off valve 15, and the spray valve 6A are closed, and the first pump 4A and the second pump 4A and the second The pump 4B is driven to supply the raw water W to the supply pipe 2. At this time, since the on-off valve 14 and the on-off valve 15 are closed, the water to be treated W1 that has passed through the antibacterial pretreatment filter 3 passes through the bypass pipe 2D. At this time, since the spray valve 6A is closed, it passes through the bypass pipe 2D and is stored in the pressure-accumulation type buffer tank 7 from the water storage pipe 21. Then, when the water to be treated W1 is stored in the accumulator buffer tank 7 to some extent, the accumulator valve 7 is opened by opening the on-off valve 12 and the drain valve 13 as shown in FIG. 7, and the backwash pipe is opened. Water W1 to be treated is supplied from 22 to the permeation side of the antibacterial pretreatment filter 3. Thereby, the backwash of the back antibacterial pretreatment filter 3 can be performed. In this way, the antibacterial pretreatment filter 3 is backwashed with the water to be treated W1 containing the antibacterial substance (silver ion) instead of the permeated water (pure water) W2 of the reverse osmosis membrane device 5. It is possible to suppress the outflow of the antibacterial substance (silver ion) of the treatment filter 3 and prevent the life of the antibacterial pretreatment filter 3 from being shortened.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, and various modifications can be carried out at the implementation stage without departing from the gist thereof. Is. For example, the antibacterial pretreatment filter 3 does not necessarily have to be provided, and the raw water W such as tap water may be used as it is as the water to be treated W1. Further, it is not necessary to supply water from the accumulator type buffer tank 7 to the spray nozzle 6, and the mixed water W3 may be directly supplied to the spray nozzle 6 from the second pump 4B. Further, particularly when a plurality of outdoor units are cooled by one unit, the external pipe 2C is used as a flexible tube such as a polyolefin resin tube, and a plurality of spray nozzles 6 are provided in this tube. By wrapping the external pipe 2C around the outdoor unit of the above, workability and degree of freedom at the time of installation can be ensured.

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples.

[Example 1 and Comparative Example 1]
Using the outdoor unit cooling auxiliary device 1 shown in FIG. 1, 10 nozzles are attached to the intake surface of the outdoor unit (rated power consumption 11.5 kW) of the air conditioner at intervals of 60 cm, and mixed water is mixed at a water volume of 56 mL / min. W3 was sprayed from the spray nozzle 6.

In order to confirm the power reduction effect, Monday, Wednesday, and Friday are set as the operating days of the outdoor unit cooling auxiliary device (Example 1) for four weeks in August when the temperature is high, and Tuesday, Thursday, Saturday, and Sunday are set as the outdoor unit cooling. The non-working day of the auxiliary device (Comparative Example 1) was set. At this time, the air conditioner was operated when the outside air temperature was 25 ° C. or higher, and the outside air temperature and the amount of electric power used were recorded every minute during this period, and the amount of electric power with respect to the outside air temperature was linearly regressed. The results are shown in FIG.

As is clear from FIG. 8, when comparing the working days and the non-working days of the outdoor unit cooling auxiliary device 1 of the present invention, it can be seen that the electric power is reduced on the working days. Especially when the temperature is 30 ° C or higher, the electric power on non-working days is 3.5 to 4.2 kW, while it is suppressed to 3.0 to 3.2 kW on working days, and 10 at 30 ° C. This means that power could be reduced by 24.7% at 3.3% and 35 ° C. No scale adhesion was confirmed on the outdoor unit during this test period.

[Example 2]
In Example 1, the air conditioner was operated and the outdoor unit cooling auxiliary device 1 was operated when the outside air temperature was 25 ° C. or higher for four weeks in August when the temperature was high. At this time, the electric conductivity of the permeated water W2 of the reverse osmosis membrane device 5 was 5 μS / m and the amount of water was 2.8 L / min, but the water to be treated W1 treated by the antibacterial pretreatment filter 3 was mixed. The electric conductivity was 25 μS / m and the amount of water was 3.2 L / min. During this period, the outside air temperature and the amount of electricity used were recorded every minute, and the amount of electricity with respect to the outside air temperature was linearly regressed. The results are shown in FIG.

[Comparative Example 2]
In the second embodiment, the operation rate of the reverse osmosis membrane device 5 was increased to make the amount of water 3.2 L / min without mixing the water W1 to be treated with the antibacterial pretreatment filter 3. The outdoor unit cooling auxiliary device 1 was operated. During this period, the outside air temperature and the amount of electricity used were recorded every minute, and the amount of electricity with respect to the outside air temperature was linearly regressed. The results are shown in FIG.

As is clear from FIG. 9, when comparing the lines obtained by linearly regressing the electric energy with respect to the outside air temperature of Example 2 and Comparative Example 2, the electric energy is determined by mixing the water to be treated W1 treated with the antibacterial pretreatment filter 3. It was confirmed that it can be reduced by about 10%.

[Example 3]
In the outdoor unit cooling assist device 1 shown in FIG. 1, tap water is used as the water to be treated W1 without using the antibacterial pretreatment filter 3, and the water to be treated by tap water is used as the permeated water W2 of the reverse osmosis membrane device 5. W1 was mixed to produce mixed water W3 having an electric conductivity of 20 μS / m. The electric conductivity of this mixed water W3 was 20 μS / m. After spraying the mixed water W3 for 30 seconds on the aluminum plate, an interval of 30 minutes was set, and during this interval, the operation of blowing the aluminum plate with air to dry it was repeated for one month. As a result, no deposits on the aluminum plate were visually confirmed. From this, it was confirmed that the problem of scale does not occur even if the mixed water W3 having an electric conductivity of 20 μS / m is sprayed on the outdoor unit of the air conditioner.

1 Outdoor unit cooling auxiliary device 2 Supply pipe 2A Antibacterial treated water pipe 2B Mixed water pipe 2C Flexible pipe 2D Bypass pipe 3 Antibacterial pretreatment filter 4A First water supply pump Water supply pump 4B Second water supply pump 5 Back-penetration film Device 6 Spray nozzle 6A Spray valve 7 Accumulation type buffer tank 11 Control valve 12 Open / close valve 13 Drain valve 14 Open / close valve 15 Open / close valve 21 Water storage pipe 22 Backwash pipe 23 Water drain pipe 24 Concentrated water discharge pipe 25 Return pipe W Raw water W1 Covered Treated water W2 Permeated water W3 Mixed water W4 Concentrated water W5 Washing drainage W6 Accumulated water

Claims (7)

An outdoor unit cooling auxiliary device that cools the heat exchanger of the outdoor unit during operation of the cooling device that combines the indoor unit and the outdoor unit.
A reverse osmosis membrane device that treats water to be treated,
A bypass mechanism that mixes the water to be treated with the permeated water of the reverse osmosis membrane device,
An outdoor unit cooling auxiliary device including a sprinkling means for sprinkling mixed water of the permeated water of the reverse osmosis membrane device and the water to be treated into the heat exchanger. The bypass mechanism includes a flow rate adjusting means, an electric conductivity meter and a flow meter for the permeated water of the reverse osmosis membrane device, and electricity of the permeated water of the reverse osmosis membrane device measured by the electric conductivity meter and the flow meter. The outdoor unit cooling assist device according to claim 1, wherein the bypass flow rate of the water to be treated can be adjusted based on the values of conductivity and flow rate. The outdoor unit cooling auxiliary device according to claim 2, wherein the electric conductivity of the mixed water is 10 to 40 μS / cm. A flow path opening / closing mechanism is provided between the reverse osmosis membrane device and the water sprinkling means, and a pressure accumulator type buffer tank is connected upstream of the flow path opening / closing mechanism to close the flow path opening / closing mechanism. The outdoor unit cooling auxiliary device according to any one of claims 1 to 3, wherein the mixed water of the permeated water of the reverse osmosis membrane device and the water to be treated can be stored in the accumulator type buffer tank. .. Any one of claims 1 to 4, wherein an antibacterial pretreatment filter is provided in front of the reverse osmosis membrane device, and the water to be treated of the reverse osmosis membrane device is the treated water of the antibacterial pretreatment filter. The outdoor unit cooling auxiliary device described in the section. It is an outdoor unit cooling assist method for cooling the heat exchanger of the outdoor unit of the cooling device that combines the indoor unit and the outdoor unit.
A part of the water to be treated is treated with the reverse osmosis membrane device, and the permeated water of the reverse osmosis membrane device and at least a part of the residue of the water to be treated are mixed.
An outdoor unit cooling assisting method in which the mixed water obtained by the mixing is sprinkled on the heat exchanger by a sprinkling means. The outdoor unit cooling assist method according to claim 6, wherein the cooling device has a plurality of outdoor units, and water is sprinkled on the heat exchangers of the plurality of outdoor units.

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