JP2013029289A - Apparatus and method for cooling of heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger cooling apparatus that sprays pure water generated by a simple configuration to prevent the generation of scale and reduces power consumption of the heat exchanger.SOLUTION: The heat exchanger cooling apparatus 1 includes: an ion-exchange-resin cartridge 10 which is a pure water generating device for generating pure water, and is filled with an ion exchange resin; and a spray nozzle 12 which is a spray device for spraying the pure water on a radiator of the heat exchanger 30.

Description

  The present invention relates to a cooling device for a heat exchanger such as an outdoor unit of an air conditioner and a cooling method for the heat exchanger.

It is said that over 40% of the electricity consumption in summer is due to air conditioners. Suppressing the power consumption of an air conditioner leads to reduction of heat island phenomenon and reduction of carbon dioxide (CO ₂ ), which is a global warming gas, as well as reduction of electric power cost, and is very advantageous.

  The air conditioner is effective by compressing the refrigerant and dissipating the heat generated at the time of compression with the air-cooled outdoor unit.However, it is effective when the outdoor temperature is high or when the outdoor unit is exposed to direct sunlight. This leads to a decrease in power consumption. Due to its structure, the air-cooled outdoor unit is greatly affected by the temperature of the installation location and solar radiation. In order to further stabilize the heat dissipation effect, it is important to make the outdoor unit cooling method more stable and less affected by weather conditions. As a method for stabilizing the cooling efficiency of the outdoor unit and increasing the efficiency, a method of spraying water on the outdoor unit has been proposed.

  Since water takes away the surrounding heat with its own latent heat of vaporization (heat of vaporization), it has the effect of relatively lowering the temperature of the air sucked by the outdoor unit for cooling, and as a result, the cooling efficiency of the outdoor unit is increased. On the other hand, various impurities are dissolved in water, and even tap water and well water with high transparency contain a large amount of ionic components that precipitate as evaporation residues. One of the indexes representing the content of ionic components in water is electrical conductivity. In general tap water and well water, the electrical conductivity is about 100 μS / cm to 300 μS / cm. When water in which such a large amount of evaporation residue is dissolved is sprayed on the outdoor unit, a white scale may be generated on the cooling fin or the like. In particular, water containing Ca, Mg, silica and the like easily generates scales, and the generated scales adhere to cooling fins and the like, and the heat dissipation efficiency of the outdoor unit is significantly reduced.

  In order to prevent the generation of scale due to spray water, it is effective to remove ionic components that generate evaporation residues from the sprayed water. For example, Patent Document 1 proposes a method of desalting from water using a reverse osmosis membrane and spraying it on an outdoor unit. A method for producing pure water using a reverse osmosis membrane is a general and effective method. However, on the other hand, as described below, (1) enlargement and complication of the apparatus, (2) reduction in effective utilization rate of water, (3) There is a demerit that pretreatment is necessary to prevent the blockage of the reverse osmosis membrane.

  The reverse osmosis membrane generally has an operating pressure of about 0.5 to 1.5 MPa. In order to obtain this water pressure, it cannot be achieved only by water supply pressure, and it is necessary to install a high-pressure booster pump or the like. Moreover, it is necessary to comprise an apparatus with the piping member etc. which can endure high pressure. These increase the size and complexity of the device, which leads to the disadvantage of increasing the price.

  Moreover, the effective utilization rate (recovery rate) of the water of a reverse osmosis membrane is about 30%-70%. In cooling outdoor units that are continuously operated, it is not preferable that the effective utilization rate of water is low in terms of cost increase and waste of water resources.

  Moreover, since reverse osmosis membrane performs desalting by passing water through fine voids, if fine particles exist in the raw water, clogging occurs and treated water cannot be obtained. Therefore, it is necessary to reliably perform the pretreatment of the raw water supplied to the reverse osmosis membrane.

JP 2010-243144 A

  An object of the present invention is to provide a cooling device for a heat exchanger and a heat exchanger capable of suppressing generation of scale and reducing power consumption of the heat exchanger by spraying pure water generated with a simple configuration. It is to provide a cooling method.

  The present invention is a heat exchanger cooling device comprising pure water generating means for generating pure water with an ion exchange resin and spraying means for spraying the pure water onto a heat radiating portion of the heat exchanger.

  Moreover, in the cooling device for the heat exchanger, it is preferable that the ion exchange resin includes an H-type cation exchange resin and an OH-type anion exchange resin.

  Further, the cooling device for the heat exchanger further includes conductivity measuring means for measuring the conductivity of the pure water, and based on the conductivity of the pure water measured by the conductivity measuring means, It is preferable that the replacement time is detected.

  The cooling device for the heat exchanger includes a plurality of the pure water generating means, and the conductivity of the pure water generated by at least one of the plurality of pure water generating means measured by the conductivity measuring means. It is preferable that the pure water is sprayed by automatically switching the flow path from the pure water generating means to the spraying means based on the rate.

  Further, the spraying means in the cooling device of the heat exchanger is preferably sprayed by a supply pressure of raw water supplied to the pure water generating means.

  The cooling device for the heat exchanger further includes an outside air temperature measuring means for measuring the outside air temperature, and the pure water is supplied to the heat radiating portion of the heat exchanger based on the outside air temperature measured by the outside air temperature measuring means. Preferably it is sprayed.

  Moreover, the cooling device for the heat exchanger preferably includes a timer, and the pure water is sprayed on the heat radiating portion of the heat exchanger at a preset time.

  Moreover, in the cooling device for the heat exchanger, it is preferable that the pure water is sprayed on the heat radiating portion of the heat exchanger in conjunction with the operation of the heat exchanger.

  Moreover, it is preferable that the cooling device for the heat exchanger includes an algicide adding means for adding an algicide to the pure water.

  Moreover, this invention is the cooling method of the heat exchanger which produces | generates pure water with an ion exchange resin, and sprays the said pure water on the thermal radiation part of a heat exchanger.

  In the heat exchanger cooling method, the ion exchange resin preferably includes an H-type cation exchange resin and an OH-type anion exchange resin.

  Moreover, in the cooling method of the heat exchanger, it is preferable that the conductivity of the pure water is measured, and the replacement time of the ion exchange resin is detected based on the measured conductivity of the pure water.

  Further, in the cooling method of the heat exchanger, a plurality of ion exchange resins are used, the conductivity of pure water generated by at least one of the plurality of ion exchange resins is measured, and the measured conductivity of the pure water is measured. Preferably, the pure water is sprayed by switching the flow path of the spray from the ion exchange resin based on the rate.

  Moreover, in the cooling method of the heat exchanger, it is preferable that the spraying is performed with a supply pressure of raw water supplied to the production of the pure water.

  Moreover, in the cooling method of the heat exchanger, it is preferable to measure the outside air temperature and spray the pure water on the heat radiating portion of the heat exchanger based on the measured outside air temperature.

  Moreover, in the cooling method for the heat exchanger, it is preferable that the pure water is sprayed on the heat radiating portion of the heat exchanger at a preset time.

  Moreover, in the cooling method for the heat exchanger, it is preferable that the pure water is sprayed on the heat radiating portion of the heat exchanger in conjunction with the operation of the heat exchanger.

  Moreover, in the cooling method for the heat exchanger, it is preferable to add an algicide to the pure water.

  In the present invention, pure water is generated by an ion exchange resin, and the pure water is sprayed on the heat radiating part of the heat exchanger, thereby spraying the pure water generated with a simple configuration and suppressing the generation of scale. It is possible to provide a heat exchanger cooling device and a heat exchanger cooling method capable of reducing the power consumption of the heat exchanger.

It is a schematic block diagram which shows an example of the cooling device of the heat exchanger which concerns on embodiment of this invention.

  Embodiments of the present invention will be described below. This embodiment is an example for carrying out the present invention, and the present invention is not limited to this embodiment.

  A schematic configuration of an example of a cooling device for a heat exchanger according to an embodiment of the present invention is shown in FIG. 1 and the configuration will be described. The heat exchanger cooling device 1 includes an ion exchange resin cartridge 10 filled with an ion exchange resin as pure water generating means, and a spray nozzle 12 as spraying means. In the example of FIG. 1, the ion exchange resin cartridge 10 includes two ion exchange resin cartridges, that is, an ion exchange resin cartridge 10a and an ion exchange resin cartridge 10b.

  In the heat exchanger cooling apparatus 1 of FIG. 1, the pipe 26 from the raw water supply source branches and is connected to the respective inlets of the ion exchange resin cartridge 10a and the ion exchange resin cartridge 10b, and a valve is connected to the outlet of the ion exchange resin cartridge 10a. A pipe 28 is connected to the outlet of the ion exchange resin cartridge 10b via a valve 16b via 16a, and these pipes merge to be connected to the spray nozzle 12. The pipe 28 may be provided with a conductivity meter 14 as a conductivity measuring means and an algicide adding device 24 as an algicide adding means. Moreover, the heat exchanger cooling device 1 may include a timer 20 and a thermometer 22 as an outside air temperature measuring unit. The heat exchanger cooling device 1 may include a control unit 18, and the control unit 18 is connected to the conductivity meter 14, valves 16 a and 16 b, the timer 20, the thermometer 22, and the like through electrical connection means. . Further, the control unit 18 may be connected to the heat exchanger 30 to be cooled by an electrical connection means or the like.

  An operation of the heat exchanger cooling method and the heat exchanger cooling device 1 according to the present embodiment will be described.

  The valve 16a is opened and the valve 16b is closed, and the raw water from the raw water supply source is supplied to the ion exchange resin cartridge 10a through the pipe 26. The raw water is subjected to ion exchange treatment with the ion exchange resin of the ion exchange resin cartridge 10a to obtain pure water (pure water generation step), and the generated pure water passes through the pipe 28 from the spray nozzle 12 and is subjected to heat exchange that is a cooling target. It sprays on the thermal radiation part of the container 30 (spraying process), and the heat exchanger 30 is cooled.

  As a method for spraying pure water, (1) a method in which pure water is sprayed with an extremely fine particle size, evaporated in the atmosphere and then sucked into a heat radiating part of a heat exchanger (indirect spraying), (2) pure water There is a method of spraying directly on the heat radiating part of the heat exchanger and evaporating on the heat radiating part (direct spraying) etc., but the latter can spray a large amount of pure water and it is easier to obtain the effect of heat of vaporization As a result, the cooling efficiency of the heat exchanger can be increased.

In the cooling device and cooling method for a heat exchanger according to the present embodiment, pure water is generated using an ion exchange resin and sprayed onto the heat radiating portion of the heat exchanger. The production of pure water by ion exchange resin is superior to the reverse osmosis membrane method, for example, in the following points.
(1) A container (cartridge) for storing ion exchange resin generally has a pressure loss during water flow lower than the operating pressure of a reverse osmosis membrane, and does not require the use of a pump for increasing the pressure of water. . Since pure water can be sprayed at the supply pressure of the raw water, not only can the apparatus be constructed simply, but there is no need for new power supply construction.
(2) The effective utilization rate of water is almost 100%, and wasteful water is hardly generated.
(3) Blockage of the flow path hardly occurs.
(4) Equipment costs can be reduced compared to reverse osmosis membranes (for example, 1/5 or less).

  Therefore, the cooling device for the heat exchanger according to this embodiment can spray pure water generated with a simple configuration to suppress the generation of scale and reduce the power consumption of the heat exchanger.

  The ion exchange resin used in the cooling device and cooling method of the heat exchanger according to the present embodiment is not particularly limited as long as it can reduce the amount of ion components such as Ca, Mg, and silica in water. There is no. Examples of the ion exchange resin include H-type cation exchange resin, OH-type anion exchange resin, Na-type cation exchange resin and the like. In order to prevent Na ions and the like from being generated by ion exchange as much as possible, H-type cation exchange resin and What contains OH type anion exchange resin, for example, a mixed bed of H type cation exchange resin and OH type anion exchange resin, preferably a multilayer of H type cation exchange resin and OH type anion exchange resin, H type cation exchange resin And a mixed bed of OH type anion exchange resin is more preferable. In addition, when a non-regenerative type ion exchange resin cartridge is used and the ion component removal capability is reduced, the ion exchange resin may be exchanged together with the cartridge, for example.

  The filling amount of the ion exchange resin filled in the ion exchange resin cartridge is preferably in the range of 5 to 200 L from the viewpoints of pressure loss, water quality, ease of transportation, and the like. When the filling amount of the ion exchange resin is less than 5L, the pressure loss becomes high and the water quality tends to deteriorate, and when it exceeds 200L, it may be difficult to transport the cartridge.

  In the present embodiment, the conductivity of pure water generated by the ion exchange resin is in the range of 0.055 μS / cm to 100 μS / cm, and preferably in the range of 0.055 μS / cm to 10 μS / cm. When the conductivity of pure water exceeds 100 μS / cm, scale is likely to occur in the heat exchanger to be cooled.

  The raw water used in the present embodiment is, for example, tap water, industrial water, well water or the like. By using tap water, pure water can be generated simply by passing water through the H-type cation exchange resin and the OH-type anion exchange resin, so that equipment costs such as pretreatment can be reduced.

  The object to be cooled in the present embodiment is a heat exchanger, and examples of the heat exchanger include an outdoor unit of an air conditioner (air conditioner), an air-cooled chiller outdoor unit, and a heat pump outdoor unit. When the object to be cooled is an outdoor unit of an air conditioner (air conditioner), pure water is sprayed by directly spraying pure water toward the cooling fins of the outdoor unit and evaporating it with the cooling fins. Can be taken. Also, do not direct the spraying means toward the cooling fins etc. of the outdoor unit, for example, spray pure water from the upper side of the outdoor unit to the lower side of the outdoor unit, and draw pure water together with the suction of the outdoor air from the outdoor unit of the outdoor unit. It is also possible to take a method of taking in a cooling fin or the like and evaporating in the cooling fin or the like.

  The spraying means is not particularly limited as long as it can spray pure water, but a spray nozzle is preferable.

  Based on the conductivity of pure water measured by the conductivity meter 14, the replacement time of the ion exchange resin may be detected. For example, when the conductivity measured by the conductivity meter 14 exceeds a preset reference value, it may be determined that it is time to replace the ion exchange resin. When it is time to replace the ion exchange resin, the regeneration process of the ion exchange resin may be performed, or the ion exchange resin may be replaced, for example, along with the cartridge.

  In the example of FIG. 1, two ion exchange resin cartridges, ie, an ion exchange resin cartridge 10a and an ion exchange resin cartridge 10b, are provided as the pure water generating means, but it is sufficient that at least one ion exchange resin cartridge is provided. There is no particular limitation. A plurality of ion exchange resin cartridges are provided as pure water generating means, and the control unit 18 determines the conductivity of pure water generated by at least one of the plurality of ion exchange resin cartridges measured by the conductivity meter 14. The flow path from the ion exchange resin cartridge 10 to the spray nozzle 12 may be automatically switched to spray pure water. For example, the valve 16a is opened, the valve 16b is closed, pure water is supplied from the ion exchange resin cartridge 10a to the spray nozzle 12 and sprayed, and the conductivity measured by the conductivity meter 14 is a preset reference. When the value is exceeded, the control unit 18 may automatically close the valve 16a and open the valve 16b so that pure water is supplied from the ion exchange resin cartridge 10b to the spray nozzle 12. Thereby, pure water can be continuously supplied to the spray nozzle 12.

  In the cooling apparatus and cooling method for the heat exchanger according to the present embodiment, pure water may be sprayed on the heat radiating portion of the heat exchanger 30 based on the outside air temperature measured by the outside thermometer 22. For example, when the outside air temperature measured by the outside thermometer 22 is equal to or higher than a preset temperature, the open / close state of the valves 16a and 16b may be automatically controlled by the control unit 18. Thereby, when the outside air temperature is relatively low, that is, when the cooling of the heat exchanger 30 is unnecessary, the spraying of pure water can be stopped, and the heat exchanger cooling device 1 can be operated efficiently. The amount of use can be reduced. Moreover, generation | occurrence | production of algae etc. can be suppressed.

  In the heat exchanger cooling device and cooling method according to the present embodiment, pure water may be sprayed onto the heat radiating portion of the heat exchanger 30 at a time set in advance by the timer 20. For example, the control unit 18 may automatically control the open / closed state of the valves 16a and 16b based on a control signal issued by the timer 20 or the like. Thereby, when cooling of the heat exchanger 30 at night or the like is unnecessary, spraying of pure water is stopped, and the heat exchanger cooling device 1 can be operated efficiently, and the amount of water used is reduced. Can do. Moreover, generation | occurrence | production of algae etc. can be suppressed.

  In the heat exchanger cooling device and cooling method according to the present embodiment, pure water may be sprayed onto the heat radiating portion of the heat exchanger 30 in conjunction with the operation of the heat exchanger 30. For example, the open / close state of the valves 16a and 16b may be automatically controlled by the control unit 18 based on an operation signal or the like generated by the heat exchanger 30. Thereby, when the heat exchanger 30 is not operating, spraying of pure water can be stopped, the heat exchanger cooling device 1 can be operated efficiently, and the amount of water used can be reduced. Moreover, generation | occurrence | production of algae etc. can be suppressed.

  In the heat exchanger cooling device and cooling method according to the present embodiment, an algicidal agent may be added to pure water. There is no restriction | limiting in particular in the addition position and addition method of an algicide. For example, the algicide may be added to the pure water in the pipe 28 by the algicide addition device 24 such as an algicide storage tank or a pump. Since the generation of algae significantly reduces the heat exchange efficiency of the heat exchanger, algae are added to the heat radiating part of the heat exchanger 30 by adding an algicide to pure water at a predetermined time (for example, periodically). Generation | occurrence | production is suppressed and the fall of the heat exchange efficiency of a heat exchanger can be suppressed.

  Hereinafter, although an example and a comparative example are given and the present invention is explained more concretely in detail, the present invention is not limited to the following examples.

<Example 1>
Using a home air conditioner, a pure water spray experiment was conducted.
(Experimental conditions)
Equipment cooling capacity 2.8kW
Outside temperature 30-31.5 ℃
Indoor set temperature 26 ℃
Raw water used Tap water Used ion exchange resin Mixed bed of H-type cation exchange resin (organo) and OH-type anion exchange resin (manufactured by organo) 10L filling amount of ion exchange resin
Spraying means Spray nozzle Pure water spray rate 150cc / min
After the room was kept at a constant temperature and the operation of the air conditioner was stabilized, the power consumption of the air conditioner was measured when operated for 2 hours under the condition of spraying pure water onto the outdoor unit of the air conditioner. Spraying was performed so that pure water was applied as uniformly as possible to the entire heat radiation fin of the outdoor unit. The results are shown in Table 1.

<Comparative Example 1>
The power consumption of the air conditioner was measured in the same manner as in Example 1 except that the condition was that no pure water was sprayed on the outdoor unit of the air conditioner. The results are shown in Table 1.

  By spraying pure water produced by ion exchange resin on the outdoor unit, an effect of reducing power consumption by about 30% was confirmed. Moreover, in Example 1, although it drive | operated for 200 hours, generation | occurrence | production of the scale to the radiation fin of an outdoor unit was not confirmed.

  DESCRIPTION OF SYMBOLS 1 Heat exchanger cooling device, 10, 10a, 10b Ion exchange resin cartridge, 12 Spray nozzle, 14 Conductivity meter, 16a, 16b Valve, 18 Control part, 20 Timer, 22 Thermometer, 24 Algaeicide addition device, 26, 28 piping, 30 heat exchangers.

Claims (18)

  A cooling device for a heat exchanger, comprising: pure water generating means for generating pure water with an ion exchange resin; and spraying means for spraying the pure water on a heat radiating portion of the heat exchanger. The heat exchanger cooling device according to claim 1,
The heat exchanger cooling device, wherein the ion exchange resin includes an H-type cation exchange resin and an OH-type anion exchange resin. The heat exchanger cooling device according to claim 1 or 2,
Conductivity measuring means for measuring the conductivity of the pure water is provided, and the replacement time of the ion exchange resin is detected based on the conductivity of the pure water measured by the conductivity measuring means. Heat exchanger cooling system. A cooling device for a heat exchanger according to claim 3,
From the pure water generating means, comprising a plurality of the pure water generating means, based on the conductivity of pure water generated by at least one of the plurality of pure water generating means measured by the conductivity measuring means. The heat exchanger cooling device, wherein the flow path to the spraying means is automatically switched to spray the pure water. The heat exchanger cooling device according to any one of claims 1 to 4,
In the spraying means, the heat exchanger cooling device is sprayed by a supply pressure of raw water supplied to the pure water generating means. A cooling device for a heat exchanger according to any one of claims 1 to 5,
A heat exchanger comprising an outside air temperature measuring means for measuring an outside air temperature, wherein the pure water is sprayed on a heat radiating portion of the heat exchanger based on the outside air temperature measured by the outside air temperature measuring means. Cooling system. The heat exchanger cooling device according to any one of claims 1 to 6,
A cooling device for a heat exchanger, comprising a timer, wherein the pure water is sprayed on a heat radiating portion of the heat exchanger at a preset time. A cooling device for a heat exchanger according to any one of claims 1 to 7,
The cooling device for a heat exchanger, wherein the pure water is sprayed on a heat radiating portion of the heat exchanger in conjunction with the operation of the heat exchanger. It is a cooling device of the heat exchanger of any one of Claims 1-8,
A cooling device for a heat exchanger, comprising: an algicide additive means for adding an algicide to the pure water.   A method for cooling a heat exchanger, characterized in that pure water is produced by an ion exchange resin, and the pure water is sprayed on a heat radiating portion of the heat exchanger. It is a cooling method of the heat exchanger according to claim 10,
The method of cooling a heat exchanger, wherein the ion exchange resin includes an H-type cation exchange resin and an OH-type anion exchange resin. The method for cooling a heat exchanger according to claim 10 or 11,
A method for cooling a heat exchanger, comprising measuring the conductivity of the pure water and detecting the replacement time of the ion exchange resin based on the measured conductivity of the pure water. It is the cooling method of the heat exchanger of any one of Claims 10-12,
Using a plurality of ion exchange resins, measuring the conductivity of pure water produced by at least one of the plurality of ion exchange resins, and based on the measured conductivity of the pure water, from the ion exchange resin A method for cooling a heat exchanger, characterized in that the pure water is sprayed by switching a spray flow path. It is the cooling method of the heat exchanger of any one of Claims 10-13,
Spraying with the supply pressure of the raw water supplied for the production | generation of the said pure water, The cooling method of the heat exchanger characterized by the above-mentioned. It is the cooling method of the heat exchanger of any one of Claims 10-14,
A cooling method for a heat exchanger, characterized in that an outside air temperature is measured and the pure water is sprayed on a heat radiating portion of the heat exchanger based on the measured outside air temperature. The method for cooling a heat exchanger according to any one of claims 10 to 15,
A method of cooling a heat exchanger, characterized in that the pure water is sprayed on a heat radiating part of the heat exchanger at a preset time. It is a cooling method of the heat exchanger of any one of Claims 10-16,
A method of cooling a heat exchanger, characterized in that the pure water is sprayed on a heat radiating portion of the heat exchanger in conjunction with the operation of the heat exchanger. It is a cooling method of the heat exchanger of any one of Claims 10-17,
A method for cooling a heat exchanger, comprising adding an algicidal agent to the pure water.

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