JP2019007723A - Indirect evaporative air cooler - Google Patents

Abstract

To provide an indirect evaporative air cooler capable of preventing deterioration of cooling performance due to deposit or foreign matter.SOLUTION: An indirect evaporative air cooler 100 comprises: a dry flow passage; a wet flow passage where nonwoven fabric is provided on a dry flow passage side, wherein the nonwoven fabric may contain water for generating an evaporation phenomenon; and a control unit 60 configured to perform first removal operation of removing deposit or foreign matter deposited on the nonwoven fabric resulting from evaporation of water due to water supply from a water supply unit 51, or second removal operation of removing deposit or foreign matter contained in the water supplied to the wet flow passage.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an indirect vaporization type air cooler, and more particularly to an indirect vaporization type air cooler that cools a fluid in another fluid passage by a vaporization phenomenon generated in one fluid passage.

  2. Description of the Related Art Conventionally, an indirect vaporization type air cooler that cools a fluid in another fluid passage by a vaporization phenomenon generated in one fluid passage is known (for example, see Patent Document 1).

  In Patent Document 1, a first fluid passage (wet passage) in which water is sprayed inside and a second fluid passage adjacent to the first fluid passage to cool the internal air by vaporization of water in the first fluid passage. Indirect vaporization air comprising: a fluid passage (dry passage); and means for suppressing accumulation of impurities (precipitate) by adjusting a spray amount (spray area) of water to the first fluid passage. A cooler is disclosed.

JP 2002-206834 A

  However, in the indirect vaporization type air cooler as in Patent Document 1, it is difficult to completely suppress the precipitation of impurities when water is vaporized even if the spray amount (spray area) of water is adjusted. It is thought that. In addition, during cooling operation, foreign matter (such as dust) mixed in the air taken into the first fluid passage (wet passage) may remain in the first fluid passage (wet passage). For these reasons, in the indirect vaporization type air cooler as in the above-mentioned Patent Document 1, the water retention performance and vaporization performance in the first fluid passage (wet flow passage) are deteriorated due to precipitates or foreign matters, so that indirect vaporization is performed. There is a problem that the cooling performance of the air cooler decreases. The above-mentioned Patent Document 1 does not mention a method for removing these precipitates and foreign matters.

  The present invention has been made to solve the above-described problems, and one object of the present invention is indirect capable of suppressing the cooling performance from being deteriorated due to precipitates and foreign matters. It is to provide a vaporizing air cooler.

  In order to achieve the above object, an indirect vaporization type air cooler according to one aspect of the present invention includes a dry flow path for supplying air taken in from the outside of the cooler to a cooling air supply destination, A wet holding member disposed adjacent to and capable of containing water for causing a vaporization phenomenon is provided on the dry flow path side, and cools the air flowing in the dry flow path by the vaporization phenomenon during the cooling operation. A flow path, a water supply section that supplies water to the wet flow path, and a control section that controls the supply of water by the water supply section. A first removal operation for removing precipitates or foreign matters deposited on the member, or a second removal operation for removing impurities that become precipitates contained in water supplied to the wet flow path is performed.

  In the indirect vaporization type air cooler according to one aspect of the present invention, as described above, the control unit removes precipitates or foreign matters deposited on the water retaining member due to water vaporization by supplying water from the water supply unit. The first removal operation is performed. As a result, it is possible to remove precipitates and foreign substances from the wet flow path, thereby suppressing deterioration of cooling performance due to deterioration of water retention performance and vaporization performance in the wet flow path due to precipitates and foreign substances. can do. In addition, the control unit is configured to perform a second removal operation for removing impurities that become precipitates contained in water supplied to the wet flow path. As a result, it is possible to suppress the deposits from being deposited in the wet flow path, so that the cooling performance is lowered due to the decrease in the water retention performance and vaporization performance in the wet flow path due to the deposits. Can be suppressed. Further, since the wet flow path is provided with a water retaining member for containing water, a vaporization phenomenon can be effectively generated in the wet flow path.

  In the indirect vaporization type air cooler according to the above aspect, the control unit preferably adjusts at least one of a supply timing, a supply amount, or a supply time of the water supplied from the water supply unit to perform the first removal operation. Is configured to do. If comprised in this way, a deposit and a foreign material can be easily removed from a wet flow path by adjusting the supply timing, supply amount, or supply time of water suitably.

  In the indirect vaporization type air cooler according to the above aspect, the control unit preferably performs the first removal operation by supplying water to the water retaining member by the water supply unit for a predetermined time based on the completion of the cooling operation. It is configured. If comprised in this way, the deposit deposited on the water holding member during the cooling operation or the foreign matter mixed in the water holding member can be quickly removed. As a result, it is possible to suppress the presence of precipitates or foreign matters on the water retaining member at the start of the next cooling operation.

  In the indirect vaporization type air cooler according to the above aspect, the control unit is preferably configured to perform a first removal operation by supplying water to the water retaining member by the water supply unit for a predetermined time before starting the cooling operation. Has been. If comprised in this way, the deposit deposited on the water retention member or the foreign material mixed in the water retention member during the last cooling operation or during the cooling operation stop can be removed. As a result, it is possible to suppress the presence of precipitates or foreign matters on the water retaining member at the start of the cooling operation.

  In the indirect vaporization type air cooler according to the one aspect described above, preferably, the control unit sets the water to the water retaining member by the water supply unit based on the fact that the total time of the cooling operation has reached the set threshold value. The first removal operation by supply is performed for a predetermined time. If comprised in this way, the deposit which precipitates in a water retention member and the foreign material mixed in a water retention member can be removed regularly according to the total time of cooling operation. As a result, the deposits deposited on the water retaining member and the foreign matters mixed in the water retaining member can be appropriately removed before reaching an amount that significantly reduces the cooling performance.

  In the indirect vaporization air cooler according to the above aspect, the control unit is preferably configured to increase the supply amount of water during the first removal operation more than the supply amount during the cooling operation. If comprised in this way, while depositing in the water easily the deposit deposited on the water retention member, the foreign material mixed in the water retention member can be easily washed away. As a result, it is possible to efficiently remove deposits deposited on the water retaining member or foreign matters mixed in the water retaining member.

  The indirect vaporization type air cooler according to the above aspect preferably further includes a water storage unit that stores water supplied to the wet flow channel and water discharged from the wet flow channel without being vaporized in the wet flow channel. The control unit is configured to perform the second removal operation by discharging the water having a high impurity concentration from the water storage unit. According to this structure, the amount of impurities that become precipitates in the water supplied to the wet flow path is reduced by discharging the water stored in the water storage section and having a high concentration of impurities, so It can suppress that a deposit precipitates on a member. In addition, since the water discharged from the wet flow path can be reused as water supplied to the wet flow path by the water storage unit, water supply can be performed compared to the case where the water discharged from the wet flow path is not reused. It can suppress that the supply amount of the water by a part becomes large.

  According to the present invention, as described above, it is possible to suppress the cooling performance from being deteriorated due to precipitates and foreign matters.

It is the figure which showed the general view of the indirect vaporization type air cooler by 1st-3rd embodiment of this invention. It is the figure which showed the structure of the core in the indirect vaporization type air cooler by 1st-3rd embodiment of this invention. It is a block diagram which shows the cooling operation and control of water supply of the indirect vaporization type air cooler by 1st-3rd embodiment of this invention. It is the figure which showed the general view of the indirect vaporization type air cooler by 4th and 5th embodiment of this invention. It is a block diagram which shows the cooling operation of the indirect vaporization type air cooler by 4th and 5th embodiment of this invention, and control of water supply / drainage. It is a figure for demonstrating the relationship between the impurity concentration in water, and the precipitation rate of an impurity. It is a figure for showing the change of the impurity concentration contained in the water stored in the water storage part of the indirect vaporization type air cooler by a 4th embodiment of the present invention. It is a figure for showing the change of the impurity concentration contained in the water stored in the water storage part of the indirect vaporization type air cooler by a 5th embodiment of the present invention. It is a block diagram which shows the cooling operation and control of water supply of the indirect vaporization type air cooler by the modification of the 1st-3rd embodiment of this invention. It is the figure which showed the general view of the indirect vaporization type air cooler by the modification of 4th and 5th embodiment of this invention.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

[First Embodiment]
First, with reference to FIGS. 1-3, the structure of the indirect vaporization type air cooler 100 by 1st Embodiment of this invention is demonstrated.

  The indirect vaporization type air cooler 100 according to the first embodiment of the present invention is an air cooler configured to cause a vaporization phenomenon in one flow path and cool air in the other adjacent flow path. . As shown in FIG. 1, the indirect vaporization type air cooler 100 includes an air supply flow path 10, an exhaust flow path 20, a core 30, an air supply air intake 41, and an exhaust air intake. A port 42, an air supply port 43, an exhaust port 44, a water supply unit 51, and a drainage unit 52 are provided.

  The air supply channel 10 includes a channel 11, a dry channel 12 (see FIG. 2), and a channel 13. When the air F1a outside the cooler (outdoor) is taken in from the air supply air intake port 41, the air F1a passes through the flow channel 11, the dry flow channel 12, and the flow channel 13 in this order, and the air supply port 43. Is supplied to the cooling air supply destination (indoor) as air F1b. In FIGS. 1 and 2, the air F1a and F1b passing through the air supply flow path 10 are indicated by shaded arrows.

  The exhaust flow path 20 includes a flow path 21, a wet flow path 22 (see FIG. 2), and a flow path 23. When the air F2a outside the cooler (outdoor) is taken in from the exhaust air intake port 42, the air F2a passes through the flow path 21, the wet flow path 22, and the flow path 23 in this order, and passes through the exhaust port 44 to the outdoor side. The air is exhausted as air F2b. In FIGS. 1 and 2, air F2a and F2b passing through the exhaust passage 20 are indicated by white arrows.

  As shown in FIG. 2, the core 30 has dry channels 12 and wet channels 22 stacked alternately. That is, the dry flow path 12 and the wet flow path 22 are disposed adjacent to each other. Moreover, the dry flow path 12 and the wet flow path 22 are comprised so that it may become a counterflow (The flow path direction of the air F1a and the air F2a is reverse). A partition wall 31 (for example, a polypropylene film or a thin sheet) is provided between the dry flow channel 12 and the wet flow channel 22 and is capable of conducting heat and not allowing water to pass through. A non-woven fabric 32 (for example, made of polypropylene or hygroscopic filter paper) is provided on the inner surface 22a of the wet channel 22. The nonwoven fabric 32 can retain the water supplied from the water supply unit 51. The nonwoven fabric 32 is an example of the “water retaining member” in the claims.

  In the indirect vaporization type air cooler 100 of the first embodiment, when the air F2a taken from the exhaust air intake port 42 passes through the wet flow path 22 while the nonwoven fabric 32 is retained, the nonwoven fabric 32 retains water. The water is vaporized (the water contained in the nonwoven fabric 32 is mass transferred to the air F2a). The temperature of the nonwoven fabric 32 in which the retained water is vaporized is reduced (cooled) as compared with that before vaporization due to heat being removed by the heat of vaporization. The cooled nonwoven fabric 32 cools the adjacent dry flow path 12 via the partition wall 31 capable of conducting heat. As a result, the air F1a passing through the dry flow path 12 is cooled, and the cooled air F1b (which is lower in temperature than the air F1a) can be supplied from the air supply port 43 to the cooling air supply destination (indoor). It is.

  Motor fans 41a and 42a, in which a motor and a fan are integrally formed, are disposed in the air supply inlet 41 and the exhaust air intake 42, respectively. By operating the motor fans 41a and 42a, it is possible to positively take in the air F1a and F2a from the outside of the cooler (outdoor) into the air supply passage 10 and the exhaust passage 20, respectively. Has been.

  The air supply port 43 is configured as an air supply port that supplies the air F1b in the dry flow path 12 cooled by the vaporization phenomenon in the wet flow path 22 to a cooling air supply destination (indoor). The exhaust port 44 is configured as an exhaust port that exhausts the air F2b whose humidity has increased due to the vaporization phenomenon in the wet flow path 22 to the outside.

  2, the water supply part 51 is comprised so that water (tap water) may be supplied to the wet flow path 22 from water supply parts, such as a water supply (not shown), using the water supply pump 51a. Moreover, the drainage part 52 is comprised so that the part which was not vaporized among the water hold | maintained at the nonwoven fabric 32 in the wet flow path 22 may be discharged | emitted by a sewer (not shown) etc. as waste_water | drain.

  Further, as shown in FIG. 3, the indirect vaporization type air cooler 100 includes a control unit 60, a storage unit 70, and a temperature and humidity meter 80.

  The controller 60 is configured to control the cooling operation. The control unit 60 includes a drive control unit 61, an operation time measurement unit 62, and a water supply control unit 63.

  The drive control unit 61 controls the operation of the motor fan 41 a of the supply air intake port 41 and the motor fan 42 a of the exhaust air intake port 42. The operation time measuring unit 62 is configured to be able to measure the operation time (operation time) of the motor fan 41a and the motor fan 42a. The water supply control unit 63 is configured to be able to control the supply of water to the wet flow path 22 by controlling the water supply pump 51a.

  In the following description, the operation of the motor fans 41a and 42a and the state in which water is supplied from the water supply unit 51 to the wet flow path 22 is referred to as “during cooling operation (during cooling operation)”. There is. A state other than “during cooling operation (during cooling operation)” may be referred to as “during cooling operation stop”.

  Storage unit 70 includes, for example, a nonvolatile memory. The storage unit 70 stores a program used for processing to control the operation of the motor fans 41 a and 42 a and the supply of water from the water supply unit 51 to the wet flow path 22.

  The thermohygrometer 80 is configured to measure the temperature and humidity in the air outside the cooler (outdoor). That is, the temperature / humidity meter 80 can measure the temperature and humidity of the air F1a taken in from the supply air intake port 41 and the air F2a taken in from the exhaust air intake port 42.

  In addition, in the indirect vaporization type air cooler 100 of 1st Embodiment, the timing of the start and completion | finish of a cooling operation is comprised based on external temperature. That is, in the indirect vaporization type air cooler 100, the control unit 60 acquires temperature data from the thermohygrometer 80 (see FIG. 3), and is set in advance (cooling air supply destination (indoor) needs to be cooled). It is configured to determine the timing of the start and end of the cooling operation by comparing with the air (outside air) temperature outside the cooler.

  Further, in the indirect vaporization type air cooler 100 of the first embodiment, during the cooling operation, the water supply by the water supply unit 51 efficiently performs the vaporization of the water, and uses the water that is not required for the vaporization as much as possible. In order to reduce the temperature, the process is continuously carried out little by little within the range necessary for the vaporization phenomenon based on the saturated water vapor pressure and humidity based on the temperature acquired by the thermohygrometer 80. Therefore, when the impurities (mineral content, scale) contained in the water during the cooling operation exceed the solubility in water (see FIG. 6), the impurities are deposited on the nonwoven fabric 32 as precipitates. In the state where the precipitate is deposited on the nonwoven fabric 32, the water retention performance of the nonwoven fabric 32 is lowered and the vaporization efficiency is lowered. In addition, when foreign matter (such as dust) is mixed in the air F2a taken into the wet flow path 22 during the cooling operation, the foreign matter may solidify with the nonwoven fabric 32 while the cooling operation is stopped. Even in a state where the foreign matter is solidified and stays on the nonwoven fabric 32, the water retention performance of the nonwoven fabric 32 is lowered and the vaporization efficiency is lowered.

  Therefore, in the indirect vaporization type air cooler 100 of the first embodiment, the water supply by the water supply unit 51 is controlled to continuously supply water for a certain period of time, so that it precipitates on the nonwoven fabric 32 due to the vaporization of water. The foreign matter remaining in the solidified state in the non-woven fabric 32 is removed.

  Specifically, the water supply control unit 63 removes the precipitates or foreign matters (performs the first removal operation) so that the water supply timing, supply amount, It is configured to control the supply time. In the following description, the removal operation for removing the deposits or foreign matters deposited on the nonwoven fabric 32 by supplying water from the water supply unit 51 is referred to as a “first removal operation”.

  In the indirect vaporization type air cooler 100 of the first embodiment, the water supply timing for performing the first removal operation is configured to be after the cooling operation.

  Specifically, the control unit 60 is configured to determine that the cooling operation has been completed based on the operation of the motor fans 41 a and 42 a being stopped by the drive control unit 61. Then, when it is determined that the cooling operation has ended, the water supply control unit 63 controls the water supply unit 51 to start the first removal operation. That is, in the indirect vaporization type air cooler 100 of the first embodiment, the first removal operation is performed by supplying water to the nonwoven fabric 32 continuously for a predetermined period based on the completion of the cooling operation. It is configured.

  The water supply control unit 63 is configured to be able to adjust the amount of water supplied by the water supply unit 51. That is, in the indirect vaporization type air cooler 100 of the first embodiment, the supply amount of water for performing the first removal operation is more efficient than the supply amount during the cooling operation in order to efficiently remove precipitates or foreign matters. Is also configured to increase. Thereby, a small amount of water can be supplied during the cooling operation, and a relatively large amount of water can be supplied only when the first removal operation is performed.

  Moreover, the water supply control part 63 is comprised so that adjustment of the water supply time by the water supply part 51 is possible. The water supply control unit 63 performs control so as to adjust the water supply amount and the water supply time so that the total supply amount necessary for removing the deposits or foreign matters is obtained.

  In order to efficiently remove precipitates or foreign matters, in the indirect vaporization type air cooler 100 of the first embodiment, the adjustment of the water supply amount and the supply time by the water supply control unit 63 is performed in the drainage unit 52. It is configured to be performed based on the concentration of impurities (mineral content, scale) contained in water.

  Specifically, as shown in FIG. 3, in the indirect vaporization type air cooler 100 of the first embodiment, the drainage part 52 has a concentration of impurities (mineral content, scale) contained in the water in the drainage part 52. A scale densitometer 52a capable of measurement is provided. Scale densitometer 52a includes, for example, an electrical conductivity sensor. Thus, when the first removal operation is performed, the supply amount and supply time of water for removing precipitates or foreign matters can be adjusted based on the concentration of impurities measured by the scale densitometer 52a. it can.

  For example, when the first removal operation is performed, the measurement value of the scale densitometer 52a gradually decreases. When the precipitate or foreign matter is sufficiently removed, the measurement value of the scale densitometer 52a converges. That is, in the indirect vaporization type air cooler 100 of the first embodiment, the end timing of the first removal operation can be determined based on the measured value of the scale densitometer 52 a provided in the drainage part 52.

(Effect of 1st Embodiment)
In the first embodiment, the following effects can be obtained.

  In the first embodiment, as described above, the control unit 60 performs the first removal operation of removing precipitates or foreign matters deposited on the nonwoven fabric 32 due to the vaporization of water due to the water supply by the water supply unit 51. Configure. Thereby, since deposits and foreign substances can be removed from the wet flow path 22, the cooling performance is reduced due to a decrease in water retention performance and vaporization performance in the wet flow paths 22 due to the precipitates and foreign substances. Can be suppressed. Moreover, since the wet flow path 22 is provided with the nonwoven fabric 32 for containing water, the vaporization phenomenon can be effectively generated in the wet flow path 22.

  In the first embodiment, the control unit 60 is configured to perform the first removal operation by adjusting the supply timing, supply amount, and supply time of the water supplied from the water supply unit 51. If comprised in this way, a deposit and a foreign material can be easily removed from the wet flow path 22 by adjusting the supply timing, supply amount, or supply time of water suitably.

  In the first embodiment, the control unit 60 is configured to perform the first removal operation by supplying water to the nonwoven fabric 32 by the water supply unit 51 for a predetermined time based on the end of the cooling operation. Thereby, the deposit deposited on the nonwoven fabric 32 during the cooling operation or the foreign matter mixed in the nonwoven fabric 32 can be quickly removed. As a result, it is possible to suppress the presence of precipitates or foreign matters in the nonwoven fabric 32 at the start of the next cooling operation.

  Moreover, in 1st Embodiment, the control part 60 is comprised so that the supply amount of the water at the time of 1st removal operation may be made to increase rather than the supply amount at the time of cooling operation. Thereby, the precipitate deposited on the nonwoven fabric 32 can be easily dissolved in water, and the foreign matter mixed in the nonwoven fabric 32 can be easily washed away with water. As a result, precipitates deposited on the nonwoven fabric 32 or foreign matters mixed in the nonwoven fabric 32 can be efficiently removed.

[Second Embodiment]
A second embodiment will be described with reference to FIG. In the second embodiment, an example in which the first removal operation is performed before the start of the cooling operation will be described. In addition, in the figure, the same code | symbol is attached | subjected to the part of the structure similar to the said 1st Embodiment.

  In the indirect vaporization air cooler 200 according to the second embodiment of the present invention, as shown in FIG. 3, the control unit 260 is replaced with the water supply control unit 63 of the indirect vaporization air cooler 100 according to the first embodiment. A water supply control unit 263 is provided.

  The water supply control unit 263, like the water supply control unit 63 of the indirect vaporization type air cooler 100 according to the first embodiment, precipitates by the water supply unit 51 so as to remove precipitates or foreign matters (perform the first removal operation). It is configured to control the supply timing, supply amount, and supply time of water for removing objects or foreign matters.

  On the other hand, unlike the indirect vaporization type air cooler 100 of the first embodiment, the indirect vaporization type air cooler 200 is configured such that the water supply timing for performing the first removal operation is set before the start of the cooling operation. Yes.

  Specifically, the control unit 260 is configured to determine that the cooling operation is started based on the outside air temperature measured by the thermohygrometer 80. Then, when it is determined that the cooling operation is started, the water supply control unit 263 controls the water supply unit 51 so that the first removal operation is finished before the cooling operation is started, so that the first removal is performed. Start operation. That is, in the indirect vaporization type air cooler 200 of the second embodiment, the first removal operation is performed by supplying water to the nonwoven fabric 32 continuously for a predetermined period before starting the cooling operation. Yes.

  In addition, the other structure of the indirect vaporization type air cooler 200 by 2nd Embodiment is the same as that of the said 1st Embodiment.

(Effect of 2nd Embodiment)
In the second embodiment, as described above, the control unit 260 is configured to perform the first removal operation by supplying water to the nonwoven fabric 32 by the water supply unit 51 for a predetermined time before starting the cooling operation. Thereby, the deposit deposited on the nonwoven fabric 32 during the previous cooling operation or during the cooling operation stop or foreign matters mixed in the nonwoven fabric 32 can be removed. As a result, it is possible to suppress the presence of precipitates or foreign matters in the nonwoven fabric 32 at the start of the cooling operation.

  The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

[Third Embodiment]
A third embodiment will be described with reference to FIG. In the third embodiment, an example will be described in which the first removal operation is performed when the total operation time of the cooling operation reaches a preset set value. In addition, in the figure, the same code | symbol is attached | subjected to the part of the structure similar to the said 1st and 2nd embodiment.

  In the indirect vaporization type air cooler 300 according to the third embodiment of the present invention, as shown in FIG. 3, the control unit 360 includes the water supply control unit 63 and the second implementation of the indirect vaporization type air cooler 100 according to the first embodiment. It replaces with the water supply control part 263 of the indirect vaporization type air cooler 200 by a form, and the water supply control part 363 is provided.

  The water supply control unit 363, like the water supply control unit 63 of the first embodiment and the water supply control unit 263 of the second embodiment, removes the precipitates or foreign matters (performs the first removal operation) so as to remove the water supply unit 51. Is configured to control the supply timing, supply amount, and supply time of water for the removal of precipitates or foreign matters.

  On the other hand, unlike the water supply control unit 63 of the first embodiment and the water supply control unit 263 of the second embodiment, the water supply control unit 363 sets the water supply timing for performing the first removal operation in advance for the total operation time of the cooling operation. It is configured so that the set value is reached.

  Specifically, the control unit 360 determines whether the total operation time measured by the operation time measurement unit 62 and stored in the storage unit 70 has reached a preset setting value (threshold value). . Then, when it is determined that the total operation time has reached the set value, the water supply control unit 363 controls the water supply unit 51 to start the first removal operation. That is, in the indirect vaporization type air cooler 300 of the third embodiment, water is continuously supplied to the nonwoven fabric 32 for a predetermined period based on the total time of the cooling operation reaching the set threshold value. Thus, the first removal operation is performed.

  When the cooling operation is stopped when the total operation time reaches the set value, the control unit 360 controls the water supply unit 51 by the water supply control unit 363 so as to immediately perform the first removal operation. It is configured.

  On the other hand, when the cooling operation is being performed when the total operation time reaches the set value, the control unit 360 controls the drive control unit 61 to stop the driving of the motor fans 41a and 42a. And the control part 360 controls the water supply part 51 by the water supply control part 363 in the state which the intake of the air F1a and F2a from the air supply inlet 41 and the exhaust air intake 42 has stopped. Thus, the first removal operation is performed.

  In addition, the other structure of the indirect vaporization type air cooler 300 by 3rd Embodiment is the same as that of the said 1st Embodiment.

(Effect of the third embodiment)
In 3rd Embodiment, as mentioned above, based on the total time of cooling operation having reached the set threshold value, the control part 360 is the 1st by supply of the water to the nonwoven fabric 32 by the water supply part 51. 1 The removal operation is configured to be performed for a predetermined time. Thereby, the deposit which precipitates in the nonwoven fabric 32 and the foreign material mixed in the nonwoven fabric 32 can be removed regularly according to the total time of cooling operation. As a result, the precipitate deposited on the nonwoven fabric 32 and the foreign matter mixed in the nonwoven fabric 32 can be appropriately removed before reaching an amount that significantly reduces the cooling performance.

  The remaining effects of the third embodiment are similar to those of the aforementioned first and second embodiments.

[Fourth Embodiment]
A fourth embodiment will be described with reference to FIGS. In the fourth embodiment, an example in which the second removal operation is performed instead of the first removal operation of the first to third embodiments will be described. In addition, in the figure, the same code | symbol is attached | subjected to the part of the structure similar to the said 1st-3rd embodiment.

  As shown in FIG. 4, an indirect vaporization air cooler 400 according to the fourth embodiment of the present invention includes a water supply unit 51 and a drainage unit of the indirect vaporization air coolers 100, 200, and 300 according to the first to third embodiments. Instead of 52, a water supply unit 451, a drainage unit 452, and a water storage unit 53 are provided.

  The water supply unit 451 includes an electromagnetic valve 451b and a water supply pump 451c. The electromagnetic valve 451 b is provided between a water supply unit such as a water supply (not shown) and the water storage unit 53. In the indirect vaporization type air cooler 400 of the fourth embodiment, water (tap water) is supplied to the water storage unit 53 from a water supply unit such as a water supply (not shown) by opening the electromagnetic valve 451b. It is configured. The water supply pump 451 c is provided between the water storage unit 53 and the wet flow path 22. The indirect vaporization type air cooler 400 according to the fourth embodiment is configured to supply water (stored water) stored in the water storage unit 53 to the wet flow path 22 using a water supply pump 451c.

  The drainage part 452 is configured such that a portion of the water retained in the nonwoven fabric 32 (see FIG. 2) in the wet flow path 22 that has not been vaporized is discharged to the water storage part 53 as drainage. Moreover, the drainage part 452 is provided with the electromagnetic valve 452b. The electromagnetic valve 452b is provided on the downstream side of the water storage unit 53 connected to a sewer (not shown) or the like. The indirect vaporization type air cooler 400 is configured such that the water (stored water) stored in the water storage unit 53 is discharged as drainage from the water storage unit 53 to the sewer or the like by opening the electromagnetic valve 452b. Yes.

  In the indirect vaporization type air cooler 400 of the fourth embodiment, the water storage unit 53 includes water supplied to the wet flow channel 22 and water discharged from the wet flow channel 22 without being vaporized in the wet flow channel 22 (drainage). ) Is stored. Specifically, by opening the electromagnetic valve 451b, water (tap water) is supplied to the water storage unit 53 from a water supply unit such as a water supply (not shown). A float switch (not shown) provided inside the water storage unit 53 closes the electromagnetic valve 451b based on the fact that the water storage unit 53 is almost full, and a water supply unit such as a water supply (not shown). Stop supplying water (tap water). The water (tap water) supplied to the water storage unit 53 is stored as stored water in the water storage unit 53. Then, the cooling operation is started, and a part of the water (stored water) stored in the water storage unit 53 is supplied to the wet flow path 22. A portion of the water (reserved water) supplied to the wet flow channel 22 that has not vaporized in the wet flow channel 22 is discharged to the water storage unit 53 as drainage. During the cooling operation, the supply of water (reserved water) from the water storage section 53 to the wet flow path 22 and the discharge of water (drainage) from the wet flow path 22 are repeated.

  As shown in FIG. 5, the indirect vaporization type air cooler 400 of the fourth embodiment includes a control unit 460 instead of the control units 60, 260, and 360 of the first to third embodiments. The control unit 460 includes a water supply control unit 462 and a drainage control unit 64.

  The water supply control unit 462 is configured to be able to control the supply of water (tap water) from a water supply unit such as a water supply (not shown) to the water storage unit 53 by controlling opening and closing of the electromagnetic valve 451b. Yes. Further, the water supply control unit 462 is configured to be able to control the supply of water (stored water) stored in the water storage unit 53 to the wet flow path 22 (see FIG. 4) by controlling the water supply pump 451c. Has been.

  The drainage control unit 64 is configured to be able to control the discharge of water (stored water) stored in the water storage unit 53 to a sewer (not shown) or the like by controlling the opening and closing of the electromagnetic valve 452b. .

  With the above configuration, as shown in FIG. 4, in the indirect vaporization type air cooler 400 of the fourth embodiment, water (drainage) discharged from the wet flow path 22 is supplied to the wet flow path 22 by the water storage section 53. It is configured to be reused (circulated) as water.

  Here, the water (reserved water) supplied to the wet flow path 22 is in a state where the amount of water is reduced as compared to before the water is supplied to the wet flow path 22 by vaporization of a part of the water. It is discharged from the wet flow path 22. That is, the water (reserved water) supplied to the wet flow path 22 is discharged from the wet flow path 22 in a state where the concentration of impurities (mineral content, scale) contained in the water is increased. Therefore, when water (reserved water) is circulated and used as in the indirect vaporization type air cooler 400 of the fourth embodiment, it is included in the water (reserved water) stored in the water storage unit 53 and In the nonwoven fabric 32 (refer FIG. 2), the density | concentration of the impurity used as a precipitate rises gradually.

  Therefore, in the indirect vaporization type air cooler 400 (see FIG. 5) according to the fourth embodiment, the control unit 460 (see FIG. 5) includes precipitates contained in water (reserved water) supplied to the wet flow path 22. It is comprised so that the 2nd removal operation | movement which removes the impurity (mineral content, scale) which becomes may be performed. Specifically, the control unit 460 is configured to remove impurities that become precipitates (perform a second removal operation) by discharging water (reserved water) having a high impurity concentration from the water storage unit 53. Has been.

  Specifically, the water storage unit 53 is provided with a scale densitometer 53a for measuring the concentration of impurities (mineral content, scale). Scale densitometer 53a includes, for example, an electrical conductivity sensor. The scale densitometer 53 a is configured to be able to measure the impurity concentration of water (stored water) stored in the water storage unit 53.

  As shown in FIG. 6, when the concentration of impurities (mineral content, scale) in water exceeds the solubility in water (impurity concentration D), the impurities are deposited as precipitates. When the impurity concentration is lower than the solubility in water (impurity concentration D), no impurities are deposited. When the impurity concentration is higher than the solubility in water (impurity concentration D), the rate at which the impurities are deposited as precipitates increases in proportion to the impurity concentration.

  As shown in FIG. 7, the second removal operation is performed based on the impurity concentration of the water (reserved water) stored in the water storage unit 53 measured by the scale densitometer 53a. That is, the control unit 460 (see FIG. 5) sets the impurity concentration measured by the scale densitometer 53a (see FIG. 5) to a set value (impurity concentration C) lower than the solubility in water (impurity concentration D). When it reaches, the cooling operation is stopped. As shown in FIG. 5, the control unit 460 closes the electromagnetic valve 452 b by the drainage control unit 64 and drains the water (stored water) stored in the water storage unit 53. In addition, the control unit 460 controls the electromagnetic valve 451 b with the water supply control unit 462 to supply water (tap water) to the water storage unit 53. As a result, as shown in FIG. 7, the concentration of impurities in the water (reserved water) stored in the water storage unit 53 (see FIG. 5) is the impurity of the water (tap water) supplied from the water supply unit such as the water supply system. (Impurity concentration A).

  When the concentration of impurities in the water (reserved water) stored in the water storage unit 53 (see FIG. 5) decreases to the impurity concentration A, the control unit 460 (see FIG. 5) restarts the cooling operation again. That is, in the indirect vaporization type air cooler 400 (see FIG. 5) of the fourth embodiment, the cooling operation, the drainage of the water (reserved water) of the water storage section 53 (see FIG. 5) and the water storage section 53 (see FIG. 5). The supply of water (tap water) is alternately repeated. In this case, the concentration of the impurities contained in the water (reserved water) of the water storage unit 53 (see FIG. 5) is the increase from the impurity concentration A to the impurity concentration C during the cooling operation and the impurity concentration during the cooling operation stop. The decrease from C to the impurity concentration A is repeated. In the indirect vaporization air cooler 400 (see FIG. 5) of the fourth embodiment, the impurity concentration (impurity concentration C), which is a condition for stopping the cooling operation, is set to be higher than the solubility in water (impurity concentration D). Since it is set low, it is possible to reliably suppress the precipitation of impurities in the wet flow path 22 (see FIG. 4).

  Moreover, as shown in FIG. 5, in the indirect vaporization type air cooler 400 of 4th Embodiment, the water supply amount to the wet flow path 22 (refer FIG. 4) is adjusted according to the thermal load around a cooler. It is configured as follows. Specifically, the control unit 460 controls the water (stored water) to the wet flow path 22 (see FIG. 4) by the water supply pump 451c based on the saturated water vapor pressure and humidity based on the temperature acquired by the thermohygrometer 80. The supply amount is adjusted to the minimum amount necessary for the vaporization phenomenon.

  In addition, the other structure of the indirect vaporization type air cooler 400 by 4th Embodiment is the same as that of the said 1st-3rd embodiment.

(Effect of 4th Embodiment)
In the fourth embodiment, as described above, the control unit 460 is configured to perform the second removal operation of removing impurities that become precipitates contained in the water supplied to the wet flow path 22. Thereby, since it can suppress that a deposit precipitates in the wet flow path 22, cooling performance falls by reducing the water retention performance and vaporization performance in the wet flow path 22 resulting from a precipitate. Can be suppressed.

  Moreover, in 4th Embodiment, as mentioned above, the indirect vaporization type air cooler 400 was discharged | emitted from the wet flow path 22 without being vaporized in the water supplied to the wet flow path 22, and the wet flow path 22. The water storage part 53 which stores water is provided, and the control part 460 is comprised so that 2nd removal operation | movement may be performed by discharging | emitting the water with which the density | concentration of the impurity became high from the water storage part 53. FIG. As a result, by discharging the water stored in the water storage section 53 and having a high concentration of impurities, the amount of impurities that become precipitates in the water supplied to the wet flow path 22 is reduced. The precipitation can be suppressed. Moreover, since the water discharged | emitted from the wet flow path 22 can be reused as the water supplied to the wet flow path 22 by the water storage part 53, compared with the case where the water discharged | emitted from the wet flow path 22 is not reused. And it can suppress that the supply_amount | feed_rate of the water by the water supply part 451 becomes large.

  The remaining effects of the fourth embodiment are similar to those of the aforementioned first to third embodiments.

[Fifth Embodiment]
The fifth embodiment will be described with reference to FIGS. 5 and 8. In this fifth embodiment, instead of the indirect vaporization type air cooler 400 of the fourth embodiment configured to stop the cooling operation and perform the second removal operation, the second removal operation without stopping the cooling operation. An example configured to perform is described. In addition, in the figure, the same code | symbol is attached | subjected to the part of the structure similar to the said 4th Embodiment.

  In the indirect vaporization type air cooler 500 (see FIG. 5) according to the fifth embodiment of the present invention, as shown in FIG. 8, the cooling operation is not stopped and the wet flow channel 22 (see FIG. 4) is supplied. It is configured to perform a second removal operation for removing impurities (mineral content, scale) that become precipitates contained in water (reserved water).

  Specifically, the control unit 560 (see FIG. 5) sets the impurity concentration measured by the scale densitometer 53a (see FIG. 5) lower than the solubility (impurity concentration D) in water (impurity concentration). C), when the cooling operation is continued, the electromagnetic valve 452b (see FIG. 5) is closed by the drainage control unit 564 (see FIG. 5) and stored in the water storage unit 53 (see FIG. 5). Drain water (reserved water). As shown in FIG. 5, the control unit 560 controls the electromagnetic valve 451 b with the water supply control unit 562 to supply water (tap water) to the water storage unit 53.

  As shown in FIG. 8, the control unit 560 (see FIG. 5) is configured such that the impurity concentration of water (reserved water) stored in the water storage unit 53 (see FIG. 5) is between the impurity concentration A and the impurity concentration C. When the impurity concentration decreases to B, the drainage of water (reserved water) stored in the water storage unit 53 (see FIG. 5) and the supply of water (tap water) to the water storage unit 53 (see FIG. 5) are stopped. Then, with the passage of time, the concentration of impurities in the water (reserved water) stored in the water storage unit 53 (see FIG. 5) again increases to the impurity concentration C. That is, in the indirect vaporization type air cooler 500 (see FIG. 5) of the fifth embodiment, the water (reserved water) drainage and the water storage unit 53 (see FIG. 5) while the cooling operation is continued. The supply of water (tap water) to (see FIG. 5) is repeated intermittently. In this case, the concentration of the impurities contained in the water (reserved water) of the water storage unit 53 (see FIG. 5) rises from the impurity concentration A to the impurity concentration C when the cooling operation is started, and then from the impurity concentration C to the impurity concentration. The decrease to B and the increase from impurity concentration B to impurity concentration C are repeated.

  In addition, the other structure of the indirect vaporization type air cooler 500 by 5th Embodiment is the same as that of the said 4th Embodiment.

(Effect of 5th Embodiment)
In the fifth embodiment, as described above, the indirect vaporization type air cooler 500 does not stop the cooling operation, and impurities that become precipitates contained in water (reserved water) supplied to the wet flow path 22 ( The second removal operation for removing mineral content and scale) is performed. As a result, the second removal operation can be performed while continuing the cooling operation, so that the precipitate is deposited in the wet flow path 22 without stopping the cooling to the cooling air supply destination (indoor). Can be suppressed.

  The remaining effects of the fifth embodiment are similar to those of the aforementioned fourth embodiment.

[Modification]
It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is shown not by the description of the above-described embodiment but by the scope of claims for patent, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first to third embodiments, the example in which the start and end timings of the cooling operation are determined based on the outside air temperature measured by the thermohygrometer 80 is shown. It is not limited to this. In the present invention, the start and end timing of the cooling operation may be determined based on a calendar. In this case, for example, the calendar and temperature data are stored in the storage unit 70, or the indirect vaporization air coolers 100, 200, and 300 are configured to be acquired from the outside via a network, and the control unit 60, 260, 360 is configured to compare the current date with a calendar, estimate the outside air temperature based on the temperature data, and determine the start and end timing of the cooling operation based on the estimated outside air temperature. That's fine.

  Moreover, in the said 1st-3rd embodiment, the amount of water supply by the water supply part 51 at the time of performing 1st removal operation | movement is made larger than the supply amount at the time of cooling operation, and a precipitate or a foreign material is efficiently made. Although an example of performing the removal is shown, the present invention is not limited to this. In the present invention, when the first removal operation is performed, a scale remover that promotes removal of impurities (mineral content, scale) is mixed into the water supplied to the wet flow path 22 to efficiently precipitate or foreign matter. You may comprise so that removal may be performed. In this case, as in the modifications of the first to third embodiments shown in FIG. 9, a storage tank 91 in which the scale remover is stored, and a pump 92 and a solenoid valve 93 provided downstream thereof are provided. When the first removal operation is performed by the control unit 60 (water supply control unit 63), the scale valve is opened and the pump 92 is driven to mix the scale remover into the water flowing through the water supply unit 51. It is possible. Further, in order to efficiently remove precipitates or foreign matters, the amount of water supplied by the water supply unit 51 is made larger than the amount supplied during the cooling operation, and the scale remover is mixed in the water of the water supply unit 51. It may be.

  Moreover, in the said 1st-3rd embodiment, adjustment of the supply amount and supply time of the water by the water supply control parts 63, 263, 363 is the density | concentration of the impurity (mineral content, scale) contained in the water which flows through the drainage part 52. However, the present invention is not limited to this. In the present invention, a scale concentration meter is provided in the water supply unit 51 instead of the drainage unit 52, and the amount of water supplied and the supply time by the water supply unit 51 are adjusted based on the concentration of scale contained in the supplied water. May be. Moreover, you may make it adjust the supply amount and supply time of the water by the water supply part 51 based on both the density | concentration of the scale in the water supply part 51 and the drainage part 52. FIG.

  In the present invention, the supply amount and supply time of water by the water supply unit 51 are adjusted based on the ambient temperature and humidity of the indirect vaporization type air coolers 100, 200, and 300 measured by the thermohygrometer 80. You may comprise. In addition, information (table) in which the storage unit 70 is associated with information (calendar) that is input in advance, water component information for each region, water supply time and amount required for the removal operation, and the like. May be stored, and the amount and time of water supply by the water supply unit 51 may be adjusted based on any or some of the information.

  In the third embodiment, when the cooling operation is in progress when the total operation time reaches the set value, the control unit 360 controls the drive control unit 61 to drive the motor fans 41a and 42a. However, the present invention is not limited to this. In the present invention, a damper or the like is provided in the vicinity of the intake air intake port 41 and the exhaust air intake port 42 so that the air F1a and F2a are not taken into the supply air channel 10 and the exhaust gas channel 20. You may comprise.

  In the third embodiment, when the cooling operation is in progress when the total operation time reaches the set value, the control unit 360 controls the drive control unit 61 to drive the motor fans 41a and 42a. Although an example is shown in which the first removal operation is performed in a state where the operation is stopped, the present invention is not limited to this. In the present invention, even when the cooling operation is being performed when the total operation time reaches the set value, the first removal operation may be performed without stopping the cooling operation. In this case, it is preferable to supply the amount of water supplied by the water supply unit 51 to be larger than the amount vaporized by the cooling operation. When the first removal operation is completed, it is preferable that the normal cooling operation is automatically restarted so that the amount of supplied water is restored (decreased).

  Moreover, in the said 1st-3rd embodiment, the supply timing of the water by the water supply part 51 is set to the preset value after the cooling operation is completed, before the cooling operation is started, or the total operation time of the cooling operation is set in advance, respectively. Although an example configured to be one of the cases where the above has been reached has been shown, the present invention is not limited to this. In the present invention, the water supply timing by the water supply unit 51 is set in advance according to the measurement value of the scale densitometer 52a after the cooling operation is completed, before the cooling operation is started, or the total operation time of the cooling operation is set in advance. It may be configured to be appropriately selectable from any of the cases where the value is reached.

  Moreover, although the said 1st-3rd embodiment showed the example comprised so that 1st removal operation | movement by the water supply by the water supply part 51 might be performed for predetermined time (continuously), this invention is limited to this. Absent. In this invention, you may comprise so that the 1st removal operation | movement by the water supply by the water supply part 51 may be performed intermittently. In this case, it is preferable that the amount of water supplied at a time is increased as compared with the case where water is supplied continuously.

  Further, in the fourth and fifth embodiments, when the impurity concentration reaches a set value (impurity concentration C) lower than the solubility in water (impurity concentration D), the water (impurity concentration becomes high) ( Although the example which comprised so that the impurity which becomes a precipitate was removed by discharging | emitting the (reserved water) from the water storage part 53 (performing 2nd removal operation | movement) was shown, this invention is not limited to this. In the present invention, the second removal operation is performed based on the operation time of the indirect vaporization air coolers 400 and 500 by replacing the change in the impurity concentration in the water (reserved water) stored in the water storage unit 53 with the time. You may comprise as follows. In this case, the scale densitometer 53a for measuring the impurity concentration of the water (reserved water) stored in the water storage unit 53 is not necessary.

  In addition, when replacing the change of the impurity concentration in the water (reserved water) stored in the water storage unit 53 with time, an input unit capable of inputting component information of water (tap water) is provided, and the input water (tap water) The information may be stored in the storage unit 70 as information (table) associating the component information and water circulation amount (the amount of water (reserved water) supplied to the wet flow path 22 by the water supply pump 451c). Good. Moreover, the component information of water (tap water) for each region is stored in the storage unit 70 in advance, and the component information of water (tap water) and the circulation of water based on the region name or address input to the input unit. You may comprise so that it may memorize | store in the memory | storage part 70 as information (table) which linked | related quantity.

  Further, in the fourth and fifth embodiments, when the impurity concentration reaches a set value (impurity concentration C) lower than the solubility in water (impurity concentration D), the water (impurity concentration becomes high) ( Although the example which comprised so that the impurity which becomes a precipitate was removed by discharging | emitting the (reserved water) from the water storage part 53 (performing 2nd removal operation | movement) was shown, this invention is not limited to this. In the present invention, based on one or more of the temperature of water (tap water, stored water, drainage, etc.), the temperature of air (inside of core 30, surroundings, etc.), humidity, atmospheric pressure, impurity diffusion coefficient, You may comprise so that a 2nd removal operation | movement may be performed.

  In the fourth and fifth embodiments, water (tap water) supplied from a water supply unit such as a water supply (not shown) is stored in the water storage unit 53 as stored water and then supplied to the wet flow path 22. Although an example configured as described above is shown, the present invention is not limited to this. In the present invention, as shown in the indirect vaporization type air cooler 600 according to the modification of the fourth and fifth embodiments in FIG. 10, water (tap water) supplied from a water supply unit such as a water supply (not shown). May be supplied directly to the wet flow path 22 without being stored in the water storage section 53.

  The indirect vaporization type air cooler 600 according to the modification of the fourth and fifth embodiments includes a water supply unit 651 instead of the water supply unit 451 of the fourth and fifth embodiments. The water supply unit 651 includes a check valve 51d. In the indirect vaporization type air cooler 600, by opening the electromagnetic valve 451b, water (tap water) is supplied to the wet flow channel 22 from a water supply unit such as a water supply (not shown). The discharged water (drainage) is stored in the water storage unit 53. At the same time, the cooling operation is started. Then, the water (reserved water) stored in the water storage section 53 is supplied to the wet flow path 22 using the water supply pump 451c, and the water (drainage) discharged from the wet flow path 22 is stored in the water storage section 53. . Then, supply of water (reserved water) from the water storage unit 53 to the wet flow path 22 and discharge of water (drainage) from the wet flow path 22 are repeated. The solenoid valve 451b is closed by a float switch (not shown) provided inside the water storage unit 53 when the water storage unit 53 is substantially full. Further, in the indirect vaporization type air cooler 600, water (tap water) supplied from the water supply unit is supplied to the water supply pump 451c side by a check valve 51d provided on the wet flow path 22 side of the water supply pump 451c. It is comprised so that it may flow.

  Moreover, although the said 1st-5th embodiment showed the example which comprised the dry flow path 12 so that the air F1a taken in from the outdoor was cooled and the cooled air F1b was supplied indoors, this invention was shown. Is not limited to this. In the present invention, the dry flow path 12 may be configured to cool the air taken from the room and supply the cooled air to the room. In this case, the cooled air is supplied to a location different from the location where the air is taken in.

12 Dry channel 22 Wet channel 32 Non-woven fabric (water retaining member)
51, 451, 651 Water supply part 53 Water storage part 60, 260, 360, 460, 560 Control part 100, 200, 300, 400, 500, 600 Indirect vaporization type air cooler F1a (taken from outside the cooler)

Claims (7)

A dry flow path for cooling the air taken from the outside of the cooler and supplying it to the cooling air supply destination;
A water retaining member that is disposed adjacent to the dry flow path and can contain water for causing a vaporization phenomenon is provided on the dry flow path side, and the dry flow path is caused by the vaporization phenomenon during cooling operation. A wet flow path for cooling the air flowing in the interior;
A water supply unit for supplying water to the wet flow path;
A control unit for controlling the supply of water by the water supply unit,
The control unit is configured to remove a deposit or foreign matter deposited on the water retaining member due to water vaporization by supplying water from the water supply unit, or water supplied to the wet flow path. An indirect vaporization type air cooler configured to perform a second removal operation for removing impurities that are contained as precipitates.   The control unit is configured to perform the first removal operation by adjusting at least one of a supply timing, a supply amount, and a supply time of water supplied from the water supply unit. The indirect vaporization type air cooler described.   The said control part is comprised so that the said 1st removal operation | movement by the supply of the water to the said water retention member by the said water supply part may be performed for a predetermined period based on the completion | finish of the said cooling operation. The indirect vaporization type air cooler described in 1.   The control unit is configured to perform the first removal operation by supplying water to the water retaining member by the water supply unit for a predetermined time before starting the cooling operation. The indirect vaporization type air cooler according to claim 1.   The control unit performs the first removal operation by supplying water to the water retaining member by the water supply unit for a predetermined time based on the total time of the cooling operation reaching a set threshold value. The indirect vaporization type air cooler of any one of Claims 1-4 comprised by these.   The indirect according to any one of claims 1 to 5, wherein the control unit is configured to increase a supply amount of water during the first removal operation more than a supply amount during the cooling operation. Evaporative air cooler. A water storage unit for storing water supplied to the wet flow channel and water discharged from the wet flow channel without being vaporized in the wet flow channel;
2. The indirect vaporization air cooler according to claim 1, wherein the control unit is configured to perform the second removal operation by discharging water having a high impurity concentration from the water storage unit. .

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