JP2008101873A - Auxiliary cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an auxiliary cooling device capable of preventing increase of scale separating out in a heat exchanger by evaporation of sprayed water. <P>SOLUTION: This auxiliary cooling device intermittently sprays the water by alternately repeating a cooling spray period T1 for spraying water and a stop period T2 for stopping the water spraying in specific period to cool the heat exchanger, and a cleaning spray period T3 having the water spraying amount more than that in the cooling spray period T1 is inserted at every prescribed timing tm. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an auxiliary cooling device that sprays water on a heat exchanger mounted on an outdoor unit of an air conditioner and auxiliaryly cools the heat exchanger.

2. Description of the Related Art Conventionally, an auxiliary cooling device is known in which a heat exchanger of an outdoor unit of an air conditioner is auxiliaryly cooled to increase cooling capacity and save power in the air conditioner. In such an auxiliary cooling device, as shown in Patent Document 1, water is intermittently sprayed on a heat exchanger provided in an outdoor unit, and the heat exchanger is cooled by utilizing the sensible heat and latent heat of evaporation of the water. Like to do. This auxiliary cooling device detects that the air conditioner is in operation by the operation of a compressor provided in the outdoor unit, and determines whether or not the heat exchanger needs to be cooled based on the outside air temperature or the like. When it is determined that the heat exchanger needs to be cooled, water is intermittently sprayed based on a preset spraying mode.
JP 2006-10150 A

  By the way, in such an auxiliary cooling device, in order to use the latent heat of evaporation more effectively, a spray pattern that efficiently evaporates water adhering to the heat exchanger is set. That is, a spray pattern in which a spray period and a rest period are set such that the amount of water evaporated on the heat exchanger increases with respect to the amount of water sprayed is used. However, when such a spray pattern is used, the evaporation residue (scale) deposited on the heat exchanger increases as the evaporation amount increases. When the scale increases in this way, the cooling capacity of the heat exchanger decreases, leading to a decrease in energy efficiency of the air conditioner. For this reason, when the latent heat of vaporization is used more effectively, such an increase in scale cannot be ignored.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an auxiliary cooling device that can suppress an increase in scale that is deposited on a heat exchanger due to evaporation of sprayed water.

  The auxiliary cooling device according to the present invention is an auxiliary cooling device that intermittently sprays water on a heat exchanger of an outdoor unit of an air conditioner, and auxiliaryly cools the heat exchanger. The cooling spray period in which water is sprayed and the pause period in which water spray is stopped are alternately repeated at a constant cycle, and the water spray amount is set to be larger than the cooling spray period. A cleaning spray period is inserted at predetermined timings during the intermittent spraying.

  According to this configuration, the auxiliary cooling device is intermittent so that the cooling spray period in which water is sprayed and the pause period in which the water spray is stopped are alternately repeated at a constant period in order to cool the heat exchanger. Spraying is performed, and during the intermittent spraying, a cleaning spray period that is set so that the spray amount of water is larger than the cooling spray period is inserted at every predetermined timing. For this reason, the scale deposited on the heat exchanger and the residual water on the heat exchanger to be concentrated and scaled can be periodically washed away by spraying in a cleaning spray period in which a large spray amount is set. . Therefore, even when the amount of water evaporated from the heat exchanger increases, it is possible to suppress an increase in scale that deposits on the heat exchanger by inserting a cleaning spray period, and cooling of the heat exchanger It can suppress that ability falls.

  In the above configuration, the spray amount during the cleaning spray period is set to increase as the ratio of the amount of water evaporated on the heat exchanger to the spray amount during the cooling spray period increases. May be.

  According to the same configuration, the spray amount during the cleaning spray period is set to increase as the ratio of the amount of water evaporated on the heat exchanger to the spray amount during the cooling spray period increases. As the amount of sprayed water that flows without evaporating on the heat exchanger, i.e., the amount of water that can be used for cleaning, decreases, the amount of water used for cleaning increases by increasing the spray amount during the cleaning spray period. Can be complemented. For this reason, in order to use the latent heat of evaporation more effectively, even when using a spray pattern that efficiently evaporates water, it is possible to ensure the amount of water for washing corresponding to the increase in scale and heat exchange. An increase in scale deposited on the vessel can be suppressed.

  Further, the amount of increase in the spray amount during the cleaning spray period is set so that the cumulative increase during the intermittent spray of the evaporation amount is the same as the cumulative increase during the intermittent spray during the cleaning spray period. You may be made to do.

  According to this configuration, the spray amount during the cleaning spray period is increased so that the cumulative amount during the intermittent spraying of the spray amount during the cleaning spray period is the same as the cumulative increase during the intermittent spraying of the evaporation amount. Since the amount is set, the same amount of water that can be used for cleaning can be supplemented with the increased amount of spray during the cleaning spray period. For this reason, it is possible to perform cleaning with an amount of water commensurate with the increase in scale, and to prevent unnecessary spraying of water during the cleaning spray period and insufficient spraying during the cleaning spray period. Can do.

In the above configuration, when the intermittent spraying ends, the cleaning spray period may be provided regardless of the predetermined timing.
According to this configuration, when the intermittent spraying ends, the cleaning spray period is provided regardless of the predetermined timing, so that the heat exchanger can be cleaned at the end of the intermittent spraying. For this reason, it is possible to wash the scale deposited on the heat exchanger at the end of the intermittent spraying, and to prevent the water remaining on the heat exchanger from being scaled after the end of the intermittent spraying. .

The spraying of water during the cooling spray period and the cleaning spray period may be performed in a state where the spray amount per unit time is constant.
According to this configuration, spraying of water to the heat exchanger during the cooling spray period and the cleaning spray period is performed with a constant spray amount per unit time. It is not necessary to provide a valve device that can vary the spray amount per unit time. Further, since the spray amount per unit time is constant, the spray amount of water can be easily set by controlling the spray time.

The spray amount during the cleaning spray period may be configured to be adjustable.
According to this configuration, since the spray amount during the cleaning spray period is configured to be adjustable, there is a difference in the amount of precipitation of scale due to the difference in water quality, or a difference in evaporation amount due to the operating environment of the auxiliary cooling device, etc. In some cases, the amount of water used for cleaning can be adjusted.

The predetermined timing at which the cleaning spray period is inserted may be configured to be adjustable.
According to this configuration, since the predetermined timing at which the cleaning spray period is inserted is configured to be adjustable, the evaporation amount may vary depending on the amount of precipitation of scale due to the difference in water quality, or depending on the operating environment of the auxiliary cooling device, etc. When the difference is generated, the frequency of cleaning can be adjusted by changing the spray timing.

  According to the present invention, since the cleaning spray period in which the amount of water spray is larger than the intermittent spray cooling spray period is inserted at predetermined timings during intermittent spraying, the scale deposited on the heat exchanger is periodically Can be washed away, and an increase in scale can be suppressed. Thereby, it can suppress that the cooling capability of a heat exchanger falls.

(First embodiment)
Hereinafter, with reference to FIGS. 1-4, 1st Embodiment of the auxiliary | assistant cooling device which actualized this invention is described.

  FIG. 1 is a schematic sectional view of an outdoor unit of an air conditioner equipped with an auxiliary cooling device. The outdoor unit 10 is arranged on the roof of a building or the like, and is connected to an indoor unit (not shown) through a communication pipe. The outdoor unit 10 includes a heat exchanger 12 disposed on one side surface in the casing 11 and a fan 13 disposed on the other side surface of the casing 11 so as to face the heat exchanger 12. During operation of the air conditioner, the fan 13 rotates to suck outside air from the heat exchanger 12 side and discharge it outside the apparatus. The heat exchanger 12 is configured by passing a plurality of refrigerant tubes 15 through a plurality of fins 14, and performs heat exchange with the air sucked by the fan 13 during cooling operation, thereby cooling the refrigerant flowing through the refrigerant tubes 15. .

  The outdoor unit 10 is equipped with an auxiliary cooling device 20 that intermittently sprays water on the heat exchanger 12 during cooling operation and cools the heat exchanger 12 in an auxiliary manner. The auxiliary cooling device 20 includes a nozzle 21 that sprays water on the heat exchanger 12 and a control unit 22 that controls the water spray mode. The nozzle 21 is attached to the outdoor unit 10 by an attachment frame 23 and is connected to a water supply pipe 24 to which water is supplied via a control unit 22. The control part 22 is arrange | positioned on the upper surface of the outdoor unit 10, and controls the spray timing and spray pattern of the water sprayed from the nozzle 21 based on the driving | running state of an air conditioner. When water is intermittently sprayed from the nozzle 21 to the heat exchanger 12, the heat exchanger 12 is cooled by the sensible heat and latent heat of evaporation of the sprayed water, and the cooling capacity increases.

  FIG. 2 is a block diagram illustrating configurations of the outdoor unit 10 and the auxiliary cooling device 20. The outdoor unit 10 includes a compressor 16 and a compressor circuit 17 that drives and controls the compressor 16. The compressor circuit 17 changes the drive mode of the compressor 16 according to the cooling load or the like, and controls the amount of refrigerant circulating in the refrigerant circuit. The refrigerant discharged from the compressor 16 is heat-exchanged by the heat exchanger 12 and guided to the indoor unit of the air conditioner. Electric power is supplied to the compressor circuit 17 from the power supply 30.

  The control unit 22 of the auxiliary cooling device 20 includes a controller 25 that controls the auxiliary cooling device 20, an electromagnetic valve 26 disposed on the water supply pipe 24, and a thermistor 27 that detects the outside air temperature. The control unit 22 is connected to the compressor circuit 17 of the outdoor unit 10, and is configured so that power is supplied from the power supply 30 to the control unit 22 in conjunction with the operation of the compressor 16.

  The electromagnetic valve 26 is a switching valve that is switched between an open state and a closed state, and is opened and closed by the controller 25. When the solenoid valve 26 is opened, water is supplied from a water supply facility (not shown) to the nozzle 21 via the water supply pipe 24, and water is sprayed from the nozzle 21 to the heat exchanger 12. Thus, since the auxiliary cooling device 20 sprays water by driving the electromagnetic valve 26 to open and close, the spraying of water is performed in a state where the spraying amount per unit time is constant, and the spraying amount of water is controlled by the controller 25. Is set by controlling the spraying time.

  A detection signal from the thermistor 27 is input to the controller 25. When the controller 25 detects that the outside air temperature has become equal to or higher than a predetermined temperature based on the detection signal from the thermistor 27, the controller 25 determines that the cooling load has increased and performs intermittent spraying of water from the nozzle 21. That is, the auxiliary cooling device 20 starts intermittent spraying of water under the condition that the compressor 16 is operating and the outside air temperature is equal to or higher than a predetermined temperature.

  The control unit 22 includes a cleaning spray amount setting unit 28 and a cleaning timing setting unit 29. The cleaning spray amount setting unit 28 and the cleaning timing setting unit 29 are provided for the user to input predetermined conditions for cleaning spray control described later.

  Next, the aspect of water spraying by the auxiliary cooling device 20 will be described. FIG. 3 is a time chart showing the spray mode. When the compressor 16 is in the operating state and the condition that the outside air temperature is equal to or higher than the predetermined temperature is satisfied, the auxiliary cooling device 20 performs intermittent spraying of water in a manner as shown in FIG. FIG. 3B is an enlarged view of a time chart when intermittent spraying is performed. As shown in the figure, intermittent spraying is performed such that a cooling spray period T1 for spraying water and a pause period T2 for stopping (stopping) the spraying of water are alternately repeated at a constant cycle. That is, water is sprayed from the nozzle 21 during the cooling spray period T1, a part of the water sprayed during the rest period T2 evaporates, and the heat exchanger 12 is cooled with the sensible heat and latent heat of evaporation of the water.

  During intermittent spraying, as shown in FIG. 3A, a cleaning spray period T3 is inserted at every predetermined timing tm. The cleaning spray period T3 is set such that the spraying time is set longer than the cooling spray period T1, and thereby the amount of water sprayed is larger than the cooling spray period T1. During the cleaning spray period T3, water spray is continuously performed, and the scale deposited on the fins 14 of the heat exchanger 12 by the spraying and the residual water on the fins 14 to be concentrated and scaled are periodically added. Wash away.

  Next, the spray time of the cleaning spray period T3 set by the controller 25 will be described. When water is intermittently sprayed from the auxiliary cooling device 20, the sprayed water is divided into water that evaporates on the fins 14 and water that flows down from the fins 14. The water that evaporates on the fins 14 cools the heat exchanger 12 by latent heat of vaporization and deposits scales by evaporation. On the other hand, the water flowing down from the fins 14 can be used for washing away the scale deposited on the fins 14. For this reason, as the ratio of the evaporation amount of water evaporated on the fins 14 relative to the spray amount in the cooling spray period T1 (hereinafter referred to as the evaporation rate) increases, the precipitation amount of the scale increases and the cleaning ability of the scale decreases. It will be. Therefore, the spraying time of the cleaning spray period is set so that the amount of water sprayed during the cleaning spray period increases as the spray mode efficiently evaporates the water attached to the heat exchanger 12.

  Here, a method of setting the spray time of the cleaning spray period when the spraying mode of the auxiliary cooling device is changed to increase the evaporation rate will be described with reference to FIG. FIG. 4A shows the spray mode of the spray pattern A and the spray pattern B. FIG. In spray pattern B, cooling spray period T1 and rest period T2 are set shorter than spray pattern A, but the ratio of cooling spray period T1 and rest period T2 is set in the same manner as spray pattern A, and intermittent spray The total spray amount per predetermined time at the time is set to be the same as the spray pattern A.

  When the heat exchanger 12 is cooled by such spray patterns having different periods of intermittent spraying, a difference occurs in the cooling capacity depending on each spray pattern, and the power consumption reduction rate of the air conditioner (hereinafter referred to as energy saving rate). ) Will be different. Here, it is assumed that the energy saving rate is improved from a to b by changing the spray pattern from A to B. As shown in FIG. 4 (b), the energy saving rate and the evaporation rate are determined to have a linear relationship, and from this relationship, the evaporation rates c and d corresponding to the energy saving rates a and b are obtained. Each is calculated. For this reason, when the total spray amount per predetermined time at the time of intermittent spraying is set to Q, the increase in the evaporation amount of water per predetermined time is represented by Q × (dc).

  Then, the spray amount in the cleaning spray period is set so that the cumulative increase in the evaporation amount thus obtained is the same as the cumulative increase in the spray amount in the cleaning spray period T3. As a result, when the amount of water that can be used for washing during intermittent spraying decreases as the evaporation rate increases, the same amount of water is compensated for by the increased amount of spray during the cleaning spray period. Can be.

  For example, if the evaporation rate is increased by changing the spray pattern to B when the cleaning spray period is not provided in the spray pattern A, the evaporation rate c of A is 0.54, and the evaporation rate d of B is When the total spray amount per hour at the time of 0.59 and intermittent spray is 20 kg, in spray pattern B, 1 kg of water per hour is used for the cleaning spray period. Here, if the amount of water sprayed from the nozzle 21 per second is 0.02 kg, a cleaning spray period T3 of 50 seconds per hour may be provided. In this case, the cleaning spray period T3 of 50 seconds may be inserted at the timing of every hour, or the cleaning spray period T3 of 25 seconds may be inserted at the timing of every 30 minutes.

  In this way, the cleaning spray period T3 is set based on the evaporation amount of water, and the scale deposited on the fins 14 of the heat exchanger 12 is cleaned by inserting the cleaning spray period T3. In addition, it corresponds to the case where the difference in the amount of precipitation of scale occurs due to the difference in water quality, the case where the difference in evaporation amount occurs due to the operating environment of the auxiliary cooling device, or the case where it is desired to surely clean the fins 14, The spray time of water in the cleaning spray period T3 and the predetermined timing tm at which the cleaning spray period T3 is inserted are configured to be adjustable by user input.

  Adjustment of the spray time of the cleaning spray period T3 is performed by input from the cleaning spray amount setting unit 28. For example, when it is desired to increase the spraying time, the spraying time can be changed by inputting an increasing spraying time to the cleaning spray amount setting unit 28. The adjustment of the timing tm of the cleaning spray period T3 is performed by an input from the cleaning timing setting unit 29. For example, when it is desired to change the insertion interval of the cleaning spray period T3 from 30 minutes to 20 minutes, the timing tm can be changed by inputting the fact to the cleaning timing setting unit 29.

According to the first embodiment, the following effects can be obtained.
(1) In 1st Embodiment, in order to cool the heat exchanger 12, the auxiliary | assistant cooling device 20 performs intermittent spraying so that the cooling spray period T1 and the idle period T2 may be repeated alternately with a fixed period, During the intermittent spraying, a cleaning spray period T3 set so that the amount of water spray is larger than the cooling spray period T1 is inserted at every predetermined timing tm. For this reason, the scale deposited on the fins 14 and the residual water on the fins 14 to be concentrated and scaled can be periodically washed away by spraying in the cleaning spray period T3. Therefore, it can suppress that the cooling capacity of a heat exchanger falls due to precipitation of a scale, and can suppress the fall of the energy efficiency of an air conditioner.

  (2) In the first embodiment, the spray amount during the cleaning spray period T3 is set so as to increase as the evaporation rate increases, so that the water sprayed during the cooling spray period T1 flows down from the fins 14 and is used for cleaning. As the amount of water used as a decrease, the amount of spray for the cleaning spray period T3 can be increased to supplement the water for cleaning. For this reason, even when using a spray pattern that efficiently evaporates water, it is possible to secure an amount of water for cleaning corresponding to an increase in scale, and to suppress an increase in scale deposited on the fins 14. .

  (3) In the first embodiment, when a spray pattern for efficiently evaporating water is used, the amount of spray during the cleaning spray period T3 is equal to the amount of spray during the cleaning spray period T3. It is set to be the same amount as the cumulative increase. For this reason, the same amount of water that has flowed down from the fins 14 and used for cleaning can be supplemented with the increased amount of spray during the cleaning spray period T3. For this reason, it is possible to perform cleaning with an amount of water commensurate with the increase in scale, preventing unnecessary spraying of water in the cleaning spray period T3 and insufficient spraying in the cleaning spray period T3. can do.

  (4) In the first embodiment, spraying of water from the nozzle 21 is performed by opening / closing driving of the electromagnetic valve 26, so that intermittent spraying can be easily performed only by ON / OFF control. In this case, since the spraying of water is performed in a state where the spraying amount per unit time is constant, the spraying amount of water can be easily set by controlling the spraying time.

  (5) In the first embodiment, the adjustment of the spray time of the cleaning spray period T3 can be performed by input from the cleaning spray amount setting unit 28. The amount of water for cleaning in the cleaning spray period T3 can be adjusted when there is a difference in evaporation amount due to the operating environment of the auxiliary cooling device.

  (6) In the first embodiment, since the adjustment of the timing tm of the cleaning spray period T3 can be performed by input from the cleaning timing setting unit 29, a difference in the amount of precipitation of scale occurs due to a difference in water quality, When the difference in evaporation amount occurs due to the operating environment of the auxiliary cooling device or the like, the frequency of cleaning can be adjusted by changing the timing tm.

(Second Embodiment)
Next, a second embodiment of an auxiliary cooling device embodying the present invention will be described with reference to FIGS. In the second embodiment, during intermittent spraying of the auxiliary cooling device, the cleaning spray period set so that the spray amount of water is larger than the cooling spray period is inserted at every predetermined timing in the first embodiment. However, it differs from the first embodiment in that a cleaning spray period is provided at the end of intermittent spraying regardless of the predetermined timing. In the embodiment described below, the overlapping description of the same configuration as the first embodiment is omitted or simplified.

  FIG. 5 is a block diagram illustrating configurations of the outdoor unit 10 and the auxiliary cooling device 40. The auxiliary cooling device 40 includes a nozzle 21 that sprays water on the heat exchanger 12 of the outdoor unit 10 and a control unit 22 that controls the water spraying mode. The controller 22 is directly supplied with electric power from the power supply 30 that drives the compressor 16 without going through the compressor circuit 17. For this reason, even when the operation of the compressor 16 is stopped, electric power is always supplied to the control unit 22, and water spray control in the operation stop state of the air conditioner is possible.

  The discharge pipe 18 of the compressor 16 is provided with a discharge pipe thermo 19 for detecting the temperature of the discharge pipe 18. The discharge pipe thermo 19 is connected to the controller 25 of the control unit 22. The controller 25 determines whether or not the compressor 16 is in an operating state based on the temperature of the discharge pipe 18 detected by the discharge pipe thermo 19.

  Further, the outside temperature detected by the thermistor 27 is input to the controller 25. When the controller 25 determines that the compressor 16 is in an operating state and detects that the outside air temperature has become equal to or higher than a predetermined temperature, the controller 25 determines that the cooling load of the air conditioner has increased, Start intermittent spraying. The intermittent spraying is performed by the controller 25 driving the electromagnetic valve 26 to open and close, whereby the intermittent spraying of water performed from the nozzle 21 to the heat exchanger 12 is controlled.

  The control unit 22 includes a cleaning spray amount setting unit 28 that is operated when adjusting the spray amount in the cleaning spray period, and a cleaning timing setting unit 29 that is operated when adjusting the insertion interval of the cleaning spray period. Is provided.

  Next, the aspect of water spraying by the auxiliary cooling device 40 will be described. FIG. 6 is a time chart showing the spray mode. When the condition that the compressor 16 is in the operating state and the outside air temperature is equal to or higher than the predetermined temperature is satisfied, the controller 25 changes the intermittent spray execution flag from OFF to ON to start intermittent spray. The intermittent spraying is performed in the same manner as the intermittent spraying (see FIG. 3) of the first embodiment. That is, the cooling spray period and the rest period are alternately repeated at a constant cycle, and the cleaning spray period T3 set so that the amount of water spray is larger than the cooling spray period during the intermittent spraying is a predetermined period. Inserted at every timing tm.

  When the controller 25 determines that the compressor 16 is in a stopped state based on the detection value of the discharge pipe thermo 19 or when the outside air temperature becomes lower than a predetermined temperature based on the detection value of the thermistor 27, the intermittent spray is executed. The flag is changed from ON to OFF and the intermittent spraying is terminated. At this time, as shown in FIG. 6, the controller 25 provides the cleaning spray period T3 regardless of the predetermined timing tm. Since the control unit 22 of the auxiliary cooling device 40 is always supplied with power from the power supply 30, such a cleaning spray period T3 can be set even when the compressor 16 is in a stopped state.

  Thus, the fin 14 of the heat exchanger 12 is cleaned by providing the cleaning spray period T3 at the end of the intermittent spray, and the water remaining on the fin 14 is scaled after the end of the intermittent spray. I try to suppress it. In addition, corresponding to the case where a difference in the amount of precipitation of scale occurs due to the difference in water quality, the water spraying time in the cleaning spray period T3 and the timing of the cleaning spray period T3 are the same as in the first embodiment. It is configured to be adjustable by user input from the setting unit 28 or the cleaning timing setting unit 29.

According to the second embodiment, in addition to the effects (1) to (6) of the first embodiment, the following effects can be obtained.
(7) In the second embodiment, when intermittent spraying ends, a cleaning spray period is provided regardless of the predetermined timing, and the fins 14 of the heat exchanger 12 are cleaned. For this reason, the scale deposited on the fins 14 at the end of the intermittent spraying can be cleaned, and the water remaining on the fins 14 after the intermittent spraying can be prevented from being scaled. it can.

In addition, you may change the said embodiment as follows.
In the first and second embodiments, the electromagnetic valve 26 is driven to open and close so that the spray amount from the nozzle 21 per unit time is constant, but the opening of the electromagnetic valve 26 is changed. You may comprise so that it can spray, and it can spray, adjusting the spray amount of water by the opening degree adjustment. If it does in this way, intermittent spraying can be set to various spraying modes.

  In the first and second embodiments, the spray time of the cleaning spray period T3 is set according to the evaporation rate of the intermittent spray. However, the cleaning spray period T3 of a certain time is provided regardless of the evaporation rate. May be.

  In the first and second embodiments, the spray time and timing of the cleaning spray period T3 can be adjusted by input from the cleaning spray amount setting unit 28 or the cleaning timing setting unit 29. 29 may be provided, and the cleaning spray period T3 may be provided at a constant spray time and timing.

  In the first embodiment, the power is supplied from the power supply 30 to the control unit 22 in conjunction with the operation of the compressor 16, but the power is supplied to the control unit 22 as in the second embodiment. You may comprise so that it may always be supplied.

  In the second embodiment, it is determined whether or not the compressor 16 is in an operating state based on the temperature of the discharge pipe 18 detected by the discharge pipe thermo 19, but the operating current value of the compressor 16 For example, it may be determined whether the compressor 16 is in an operating state based on a detection value other than the discharge pipe thermo 19.

  -In 1st and 2nd embodiment, although this invention was applied to the auxiliary | assistant cooling device 20 and 40 which sprays water with respect to the single outdoor unit 10, the auxiliary | assistant which sprays water with respect to several outdoor unit The present invention can be applied to the cooling device based on the same principle.

The schematic sectional drawing of the outdoor unit of the air conditioner which mounts an auxiliary cooling device. The block diagram which shows the structure of the outdoor unit and auxiliary cooling device which concern on 1st Embodiment. (A), (b) is a time chart which shows the spraying aspect of an auxiliary | assistant cooling device. (A) is a time chart which shows the spraying aspect from which the period of intermittent spraying differs, (b) is a graph which shows the relationship between an energy-saving rate and an evaporation rate. The block diagram which shows the structure of the outdoor unit and auxiliary cooling device which concern on 2nd Embodiment. The time chart which shows the intermittent spray execution flag and the spraying aspect of an auxiliary | assistant cooling device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Outdoor unit, 12 ... Heat exchanger, 16 ... Compressor, 20, 40 ... Auxiliary cooling device, 21 ... Nozzle, 22 ... Control part, 25 ... Controller, 26 ... Solenoid valve, 27 ... Thermistor, 28 ... Cleaning spray Volume setting unit, 29... Cleaning timing setting unit.

Claims (7)

An auxiliary cooling device that intermittently sprays water on a heat exchanger of an outdoor unit of an air conditioner and auxiliaryly cools the heat exchanger,
The intermittent spraying is performed such that a cooling spraying period for spraying water and a resting period for stopping water spraying are alternately repeated with a constant period,
The auxiliary cooling device, wherein a cleaning spray period set so that a spray amount of water is larger than the cooling spray period is inserted at predetermined timings during the intermittent spraying. The auxiliary cooling device according to claim 1, wherein
The auxiliary cooling device, wherein the spray amount during the cleaning spray period is set to increase as the ratio of the amount of water evaporated on the heat exchanger to the spray amount during the cooling spray period increases. The auxiliary cooling device according to claim 2, wherein
The increase amount of the spray amount during the cleaning spray period is set so that the cumulative increase amount during the intermittent spraying of the evaporation amount is the same as the cumulative increase amount during the intermittent spraying during the cleaning spray period. An auxiliary cooling device characterized by that. In the auxiliary cooling device according to any one of claims 1 to 3,
When the intermittent spray ends, the cleaning spray period is provided regardless of the predetermined timing. In the auxiliary cooling device according to any one of claims 1 to 4,
The auxiliary cooling device, wherein the spraying of water during the cooling spraying period and the cleaning spraying period is performed in a state where the spraying amount per unit time is constant. In the auxiliary cooling device according to any one of claims 1 to 5,
The auxiliary cooling device, wherein the spray amount during the cleaning spray period is configured to be adjustable. In the auxiliary cooling device according to any one of claims 1 to 6,
The auxiliary cooling device, wherein the predetermined timing at which the cleaning spray period is inserted is configured to be adjustable.

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