Air conditioning system

Abstract

To provide an air conditioning system capable of reliably draining water from an outlet pipe without causing waste of human resources.SOLUTION: An air conditioning system 1 comprises: an outdoor unit with a drip pervaporation type humidifier that can humidifies outdoor air by passing the outdoor air through a humidification module allowing moisture to permeate with water supplied by dripping; and pure water units 21 and 22, each comprising a water treatment device 202 for purifying water, and enabling supply of pure water to the humidifier via an outlet pipe 28. When the specific resistance value of water in the outlet pipe 28 is a first lower limit value L or lower and the stop time of the water treatment device 202 measured by a timer 261 is equal to or greater than a first stop time T1, or when the stop time of the water treatment device 202 measured by the timer 261 is equal to or greater than a second stop time T2, which is longer than the first stop time T1, a discharge valve 24 is opened, and thereby the water in the outlet pipe 28 is automatically discharged.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an air conditioning system having an outdoor air conditioner that takes in outdoor air and can adjust the humidity of the taken-in outdoor air. [Background technology]

[0002] Conventionally, there has been known an air conditioning system equipped with an outdoor air conditioner that adjusts the temperature and humidity of outdoor air and then supplies the temperature-adjusted outdoor air to a predetermined target space (for example, a space inside a building) (see, for example, Patent Document 1). Another outdoor air conditioner that is known is one equipped with a drip permeation evaporative humidifier (see, for example, Patent Document 2). This type of humidifier has a humidification module that can permeate moisture by dripping water, and humidifies outdoor air that has passed through this humidification module.

[0003] Furthermore, in the past, pure water (for example, water with a resistivity of 0.1 to 1.5 MΩ·cm) has been supplied to outdoor air-conditioning units (humidifiers) to prevent the deposition of evaporation residues and maintain the humidifier. To supply pure water to outdoor air-conditioning units (humidifiers), it is possible to provide a water purification system that purifies the pure water by removing impurities from water taken in from the outside, and then supplies the purified pure water to the humidifier through a designated outlet pipe. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2024-18372 [Patent Document 2] Japanese Patent Application Publication No. 2019-190691 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when humidification of outside air is not required, water does not need to be supplied to the humidifier, and water may accumulate in the outlet piping. This accumulated water gradually becomes contaminated with impurities, so supplying this water directly to the humidifier when humidification is required is undesirable from the standpoint of humidifier maintenance, etc. Therefore, it is conceivable to provide a discharge valve in the outlet piping, for example, and have a manager or other person operate the discharge valve at a predetermined time to manually drain the water from the outlet piping periodically.

[0006] However, when draining water manually, there is a risk that the draining work will be forgotten. Moreover, even if the draining work is performed correctly, the work requires time and effort, which may result in a waste of human resources.

[0007] The present invention has been made in consideration of the above circumstances, and aims to provide an air conditioning system that can reliably drain water from an outlet pipe at an appropriate time without wasting human resources. [Means for solving the problem]

[0008] The following describes each of the means suitable for achieving the above object, with specific effects of the corresponding means added as necessary.

[0009] Means 1. An outdoor air conditioning unit having a humidifier capable of humidifying outdoor air and capable of humidifying the outdoor air taken in by the humidifier and supplying the humidified air to a target space; An air conditioning system including a water treatment device used to purify pure water and a water purification device capable of supplying pure water to the humidifier through a predetermined outlet pipe, a resistivity measuring means for measuring the resistivity of the water in the outlet pipe; A discharge valve provided in the outlet pipe and capable of switching whether or not to discharge water in the outlet pipe; a timer that measures the stop time of the water treatment device; a discharge valve control means capable of controlling the opening and closing of the discharge valve based on the resistivity value measured by the resistivity value measuring means and the stop time measured by the timer, The air conditioning system is characterized in that the discharge valve control means is configured to open the discharge valve to discharge water in the outlet piping when the resistivity value measured by the resistivity value measuring means becomes equal to or less than a predetermined first lower limit value L and the stop time measured by the timer becomes equal to or more than a predetermined first stop time T1, or when the stop time measured by the timer becomes equal to or more than a second stop time T2 that is longer than the first stop time T1.

[0010] According to the above-described means 1, when the resistivity measured by the resistivity measuring means is equal to or less than the first lower limit L and the stop time measured by the timer is equal to or greater than the first stop time T1, or when the stop time measured by the timer is equal to or greater than the second stop time T2, which is longer than the first stop time T1, the discharge valve control means opens the discharge valve, thereby discharging the water in the outlet pipe. That is, when the amount of impurities in the water accumulating in the outlet pipe increases to a certain extent while the water treatment device is stopped for a relatively short time, or when the water treatment device is stopped for a relatively long time and it is estimated that the water in the outlet pipe is likely to be in a state unsuitable for supply to the outdoor air-conditioning unit (humidifier), the outlet pipe is automatically drained. Therefore, draining of the outlet pipe can be performed reliably and at the appropriate time without forgetting. As a result, pure water can be appropriately supplied to the outdoor air-conditioning unit (humidifier), thereby more effectively maintaining the humidifier. Furthermore, it is possible to reduce the cost of maintaining the humidifier, which ultimately reduces the running costs of the entire air-conditioning system.

[0011] Furthermore, since there is no need to manually perform the water draining work, it is possible to more reliably prevent the waste of human resources.

[0012] Means 2. The air conditioning system described in Means 1, characterized in that it is provided with a warning means for issuing a predetermined warning when the resistivity value measured by the resistivity value measuring means becomes equal to or less than a second lower limit value LL which is smaller than the first lower limit value L.

[0013] According to the above-mentioned means 2, when the resistivity measured by the resistivity measuring means falls below a second lower limit LL which is smaller than the first lower limit L, that is, when the amount of impurities in the water passing through the outlet piping has increased significantly and inappropriate water is being supplied from the deionized water system to the outdoor processing unit, a predetermined warning is issued by the warning means. Therefore, predetermined measures (such as inspection of the deionized water system) can be taken early, and ultimately the maintenance of the humidifier can be more effectively achieved.

[0014] Means 3. The humidifier is a drip permeation humidifier having a humidification module that can permeate moisture by dripping water, and can humidify outside air by passing the outside air through the humidification module; a control valve capable of adjusting the amount of water supplied from the water purifier to the humidification module; a supply air dew point temperature measuring means for measuring a dew point temperature of outdoor air that passes through the humidification module and is supplied from the outdoor air-conditioning unit to the target space; The air conditioning system according to means 1, further comprising a water supply amount control means for proportionally controlling the opening of the control valve based on the dew point temperature measured by the supply air dew point temperature measuring means.

[0015] According to the above-mentioned means 3, the amount of pure water supplied to the humidification module can be automatically adjusted according to the dew-point temperature of the outside air (supply air dew-point temperature) supplied to the target space, thereby making it possible to further stabilize the dew-point temperature of the outside air (supply air dew-point temperature) supplied to the target space.

[0016] Furthermore, according to the above-mentioned means 3, an appropriate amount of pure water can be supplied to the humidifier (humidification module), which more reliably prevents a situation in which a large amount of pure water not used for humidification is wasted. Therefore, the amount of purified water in the pure water system can be reduced, which in turn makes it possible to reduce the frequency of replacing consumables in the pure water system. This effectively reduces the cost of operating the pure water system, and as a result, combined with the effect of the above-mentioned means 1, it becomes possible to further reduce the running costs of the entire air conditioning system.

[0017] The technical matters relating to the above means may be combined as appropriate. Therefore, the technical matters relating to the above means 2 may be combined with the technical matters relating to the above means 3. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a schematic diagram illustrating an example of an air conditioning system. [Figure 2] FIG. 2 is a schematic diagram showing an example of an outdoor air-conditioning unit. [Figure 3] FIG. 2 is a schematic perspective view showing a humidification module in the humidifier. [Figure 4] 10 is a flowchart illustrating the flow of a timer count process. [Figure 5] 10 is a flowchart illustrating the flow of an automatic water draining process. [Figure 6] 10 is a flowchart illustrating the flow of a warning execution process. [Figure 7] 4 is a graph showing an example of the relationship between supply air dew point temperature and the opening degree of a control valve. [Figure 8] FIG. 10 is a relay circuit diagram showing the configuration of a control circuit according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0019] An embodiment will be described below with reference to the drawings. Fig. 1 is a schematic diagram showing an example of an air conditioning system 1. The air conditioning system 1 adjusts the temperature and humidity of the outside air taken in, and then supplies the temperature-adjusted outside air to a predetermined target space (for example, a space inside a factory building). The air conditioning system 1 includes a pure water device unit 2 and an outdoor air conditioning unit 3.

[0020] First, the pure water apparatus unit 2 will be described. The pure water apparatus unit 2 processes and controls the supply of pure water (for example, water with a resistivity of 0.1 to 1.5 MΩ·cm) to the outdoor-conditioning unit 3 (particularly the humidifier 304 of the outdoor-conditioning unit 32, which will be described later). The pure water apparatus unit 2 includes a first pure water apparatus 21, a second pure water apparatus 22, a resistivity meter 23, a discharge valve 24, a warning device 25, and a pure water apparatus controller 26. In this embodiment, the first pure water apparatus 21 and the second pure water apparatus 22 each constitute a "pure water apparatus." Furthermore, the resistivity meter 23 constitutes a "resistivity measurement means," and similarly, the warning device 25 constitutes a "warning means," and the pure water apparatus controller 26 constitutes a "discharge valve control means."

[0021] Each of the pure water systems 21 and 22 is a system for purifying pure water and supplying the purified water to the outdoor-conditioning unit 3 (particularly the humidifier 304 of the outdoor-conditioning unit 32, which will be described later). Each of the pure water systems 21 and 22 has the same components and is set to operate alternately at regular intervals (i.e., in rotation). Each of the pure water systems 21 and 22 includes a water softener 201, a water treatment device 202, and a deminer 203.

[0022] The water softening device 201 is a device for softening raw water (for example, hard water such as groundwater) taken in through a predetermined inlet pipe 27. The water softening device 201 is equipped with a water softening treatment tank containing, for example, ion exchange resin, and supplies raw water to the water softening treatment tank, where it is softened, and then supplies the raw water to the water treatment device 202.

[0023] The water treatment device 202 is a device for purifying pure water using water (soft water) supplied from the water softener 201. The water treatment device 202 is equipped with an RO membrane (reverse osmosis membrane), a filtration device, etc., and performs a "filtration process" using the RO membrane, etc., to remove impurities from the water supplied by the water softener 201 and purify pure water. The purified pure water is sent to the deminer 203. When the water treatment device 202 is in operation, the water treatment device 202 sends a predetermined operation signal indicating that the water treatment device 202 is in operation to the pure water device controller 26. This operation signal allows the pure water device controller 26 to know whether the water treatment device 202 is operating or not.

[0024] The deminer 203 has the function of further removing impurities from the water (pure water) supplied by the water treatment device 202. The pure water that has passed through the deminer 203 is supplied to the outdoor air-conditioning unit 3 through a predetermined outlet piping 28. Note that the deminer 203 in this embodiment also has the role of compensating for a decline in the impurity removal function of the water treatment device 202 when this decline occurs.

[0025] The resistivity meter 23 is provided in the outlet pipe 28 and is a device for measuring the resistivity value of the water in the outlet pipe 28. The resistivity meter 23 is configured by, for example, a resistivity sensor, and the resistivity value measured by the resistivity meter 23 is output to the pure water system controller 26.

[0026] The discharge valve 24 is provided in the outlet pipe 28 and serves to switch whether or not water in the outlet pipe 28 is discharged. The discharge valve 24 is configured, for example, as an electric valve (motor valve) and is switchable between at least two states: an open state and a closed state. By opening the discharge valve 24, it is possible to discharge water accumulated in the outlet pipe 28 to the outside. Normally, the discharge valve 24 is closed so that pure water can be supplied from the pure water devices 21, 22 to the outdoor air-conditioning unit 3.

[0027] The warning device 25 is a device for issuing a warning to the outside that an abnormality has occurred in the water supplied from the pure water systems 21, 22 to the outdoor-conditioning unit 3. The warning device 25 is configured, for example, with a display device (such as a liquid crystal display or a light-emitting lamp) capable of displaying predetermined information, and its operation is controlled by the pure water system controller 26. The warning device 25 may be any device that is capable of transmitting warning information to the outside. Therefore, the warning device 25 may be a sound generating device (such as a speaker) that can emit a predetermined warning sound, or a portable information terminal (such as a smartphone) that can emit various types of warning information to the outside.

[0028] The pure water system controller 26 controls the operation of the discharge valve 24 and the warning device 25. The pure water system controller 26 is configured, for example, by a microcontroller equipped with a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), etc. The pure water system controller 26 is capable of controlling the opening and closing of the discharge valve 24, and is also configured to be able to grasp the operating status (operating or stopped) of the water treatment device 202 and the open / closed state of the discharge valve 24.

[0029] The water purifying system controller 26 also includes a timer 261 for measuring time. The water purifying system controller 26 controls the timer 261 to perform timer count processing as shown in FIG.

[0030] In the timer count process, the water purification system controller 26 first determines in step S11 whether the water treatment device 202 has been stopped. This determination can be made based on the operation signal sent from the water treatment device 202. In this embodiment, the determination process in step S11 is performed for both the water treatment devices 202 of the two water purification systems 21 and 22.

[0031] If the water treatment device 202 (at least one water treatment device 202) is not stopped, that is, if the water treatment device 202 is in operation (step S11: NO), the pure water system controller 26 proceeds to the process of step S14.

[0032] On the other hand, if the water treatment device 202 is stopped (step S11: YES), the pure water system controller 26 determines in step S12 whether the discharge valve 24 is closed or not, based on the open / closed state of the discharge valve 24 that it knows. If the discharge valve 24 is not closed (step S12: NO), that is, if the discharge valve 24 is open, there is no need to open the discharge valve 24, and so the pure water system controller 26 proceeds to the processing of step S14.

[0033] On the other hand, if the water treatment device 202 is stopped and the discharge valve 24 is closed (steps S11 and S12: YES), the timer 261 starts counting in step S13, and then the process proceeds to step S14. Note that if the timer 261 has already started counting, the timer 261 continues counting in step S13.

[0034] In the following step S14, the pure water system controller 26 determines whether or not the operation of the water treatment device 202 has resumed. If the operation of the water treatment device 202 has resumed (step S14: YES), the pure water system controller 26 stops and resets the count of the timer 261 in step S15.

[0035] On the other hand, if the operation of the water treatment device 202 has not resumed (step S14: NO), the pure water system controller 26 determines in step S16 whether the discharge valve 24 is open or not, based on the open / close state of the discharge valve 24 that it knows. If the discharge valve 24 is open (step S16: YES), the pure water system controller 26 proceeds to step S15 and stops and resets the count of the timer 261. This is because, with the discharge valve 24 being opened, it is no longer necessary for the timer 261 to continue counting.

[0036] On the other hand, if the operation of the water treatment device 202 has not been resumed and the discharge valve 24 has not been opened (step S16: NO), the pure water system controller 26 maintains the timer 261 in the current state. Therefore, if the timer 261 is counting, the counting continues, and if the timer 261 has stopped counting, the counting is maintained in the stopped state.

[0037] By performing the timer counting process as described above, it is possible to measure the elapsed time since the water treatment device 202 was stopped while the discharge valve 24 was closed, i.e., the stopped time of the water treatment device 202 while the discharge valve 24 was closed.

[0038] Furthermore, the water purifying apparatus controller 26 automatically releases (automatically drains) water accumulated in the outlet pipe 28 by controlling the opening and closing of the discharge valve 24 based on the resistivity value measured by the resistivity meter 23 and the stop time t measured by the timer 261. That is, the water purifying apparatus controller 26 performs the automatic draining process as shown in FIG.

[0039] In the automatic water draining process, the water purifier controller 26 first determines in step S21 whether the resistivity measured by the resistivity meter 23 is equal to or less than a predetermined first lower limit L (e.g., 4 to 10 MΩ·cm, preferably 4 MΩ·cm). If the measured resistivity is equal to or less than the first lower limit L (step S21: YES), the water purifier controller 26 determines in step S22 whether the stop time t measured by the timer 261 is equal to or greater than a predetermined first stop time T1 (e.g., several hours). If the measured stop time t is equal to or greater than the first stop time T1 (step S22: YES), the water purifier controller 26 opens the discharge valve 24 (step S23). This allows water to be drained from the outlet pipe 28. If the discharge valve 24 is already open, the water purifier controller 26 maintains the discharge valve 24 in the open state in step S23.

[0040] On the other hand, if the measured resistivity is greater than the first lower limit L (step S21: NO), the pure water system controller 26 determines in step S24 whether the downtime t measured by the timer 261 is equal to or greater than a second downtime T2 (e.g., 7 days) that is longer than the first downtime T1. If the measured downtime t is equal to or greater than the second downtime T2 (step S24: YES), the pure water system controller 26 opens the discharge valve 24 (step S23). This causes water to be drained from the outlet pipe 28.

[0041] Furthermore, the pure water system controller 26 may be configured to automatically close the discharge valve 24 when the time elapsed since the discharge valve 24 was opened exceeds a predetermined time (for example, a time longer than the time required to completely drain the water from the outlet pipe 28).

[0042] On the other hand, if the measured stop time t is shorter than the first stop time T1 or the second stop time T2 (steps S22, S24: NO), the pure water system controller 26 maintains the discharge valve 24 in its current state. Therefore, for example, if the discharge valve 24 is closed, the discharge valve 24 is maintained in the closed state.

[0043] Furthermore, the water purifying system controller 26 controls the operation of the warning device 25 based on the resistivity value measured by the resistivity meter 23, thereby performing a warning execution process as shown in FIG.

[0044] In the warning execution process, first, in step S31, the pure water system controller 26 determines whether the resistivity measured by the resistivity meter 23 is equal to or less than a second lower limit LL (for example, 1 to 2 MΩ·cm, and more preferably 2 MΩ·cm) which is smaller than the first lower limit L.

[0045] If the measured resistivity is equal to or less than the second lower limit LL (step S31: YES), the water purifier controller 26 controls the operation of the warning device 25 to issue a warning to the outside in step S32. This notifies the outside that an abnormality has occurred in the water purifiers 21, 22, etc.

[0046] On the other hand, if the measured resistivity is greater than the second resistance value LL (step S21: NO), the water purification system controller 26 maintains the warning device 25 in its current state. Therefore, for example, if the warning device 25 is stopped, the warning device 25 is maintained in the stopped state.

[0047] Next, the outdoor air-conditioning unit 3 will be described. The outdoor air-conditioning unit 3 has the function of adjusting the temperature and humidity of the taken-in outdoor air and then supplying the temperature-adjusted outdoor air to the target space, and also performs processing and control related to the adjustment of the amount of pure water supplied from the pure water systems 21 and 22. As shown in FIG. 2, the outdoor air-conditioning unit 3 includes an outdoor air dew-point thermometer 31, an outdoor air-conditioning unit 32, a supply air dew-point thermometer 33, a first control valve 34, a second control valve 35, and an outdoor air-conditioning unit-side controller 36. In this embodiment, the supply air dew-point thermometer 33 constitutes the "supply air dew-point temperature measuring means," the first control valve 34 and the second control valve 35 constitute the "control valves," and the outdoor air-conditioning unit-side controller 36 constitutes the "supply water amount control means."

[0048] The outdoor air dew point thermometer 31 is provided in an outdoor air intake passage 37 for taking in outdoor air to the outdoor air conditioning unit 32, and measures the dew point temperature of the taken in outdoor air.

[0049] The outdoor air conditioning unit 32 adjusts the temperature and humidity of the outside air that is taken in, and supplies the temperature-adjusted outside air to the target space. The outdoor air conditioning unit 32 has a filter 301, a temperature adjustment coil 302, a fan 303, a humidifier 304, and a drain pan 305.

[0050] The filter 301 removes dust particles from the outside air that is taken in. The temperature adjustment coil 302 is composed of, for example, a heat exchanger in which a heat medium flows inside a heat transfer tube, and heats or cools the taken in outside air. The fan 303 is responsible for taking in outside air and supplying it to the target space.

[0051] Humidifier 304 humidifies the taken-in outside air using pure water supplied from water purifiers 21 and 22. Humidifier 304 has humidification module 304a that can permeate moisture by dripping water supply, and is a drip permeation humidifier that can humidify the outside air by passing the outside air through humidification module 304a (see FIG. 3).

[0052] Drain pan 305 is disposed below humidifier 304 and collects excess water (pure water) that humidifier 304 was unable to absorb into the outside air. The excess water collected in drain pan 305 is discharged as drain (wastewater) through a designated drain pipe.

[0053] The supply air dew point thermometer 33 is provided in the supply path 38 of outdoor air from the outdoor air-conditioning unit 32 to the target space, and measures the dew point temperature (supply air dew point temperature) of the outdoor air that passes through the humidification module 304a and is supplied to the target space from the outdoor air-conditioning unit 32. The supply air dew point thermometer 33 is configured, for example, by a duct dew point temperature sensor, and the dew point temperature measured by the supply air dew point thermometer 33 is output to the outdoor air-conditioning unit controller 36.

[0054] The first control valve 34 and the second control valve 35 are provided in the pure water supply path (i.e., the outlet piping 28) from the pure water systems 21, 22 to the outdoor air-conditioning unit 32, and adjust the amount of water supplied from the pure water systems 21, 22 to the humidifier 304 (particularly the humidification module 304a). Both control valves 34, 35 are, for example, electrically operated valves (motor valves), and are configured so that their opening can be freely changed within a range of 0 to 100%. The amount of water supplied from the pure water systems 21, 22 to the humidifier 304 increases or decreases in proportion to the opening of both control valves 34, 35.

[0055] The outdoor-air-conditioning unit-side controller 36 is a device that controls the operation of both control valves 34, 35. The outdoor-air-conditioning unit-side controller 36 is configured, for example, by a microcontroller equipped with a CPU, ROM, RAM, etc. The outdoor-air-conditioning unit-side controller 36 is configured to be able to control the opening and closing of both control valves 34, 35 and to be able to grasp the opening degrees of both control valves 34, 35.

[0056] Furthermore, the outdoor-conditioning unit controller 36 proportionally controls the openings of both control valves 34, 35 based on the dew-point temperature (supply air dew-point temperature) measured by the supply air dew-point thermometer 33. In this embodiment, the outdoor-conditioning unit controller 36 proportionally controls both control valves 34, 35 so that, for example, when the dew-point temperature is equal to or higher than a predetermined value (e.g., 12.1°C), the opening is 0%, and as the dew-point temperature drops below the predetermined value, the opening gradually increases (see FIG. 7).

[0057] As described above, according to this embodiment, when the resistivity measured by the resistivity meter 23 is equal to or less than the first lower limit L and the stop time t measured by the timer 261 is equal to or greater than the first stop time T1, or when the stop time t is equal to or greater than the second stop time T2, the discharge valve 24 is opened, thereby discharging the water in the outlet pipe 28. That is, when the amount of impurities in the water retained in the outlet pipe 28 increases to a certain extent while the water treatment device 202 is stopped for a relatively short period of time, or when the water treatment device 202 has been stopped for a relatively long period of time and it is estimated that the water in the outlet pipe 28 is likely to be in a state unsuitable for supply to the outdoor air-conditioning unit 32 (humidifier 304), water is automatically drained from the outlet pipe 28. Therefore, water draining from the outlet pipe 28 can be performed reliably at an appropriate time without forgetting to do so. As a result, pure water can be appropriately supplied to the outdoor air-conditioning unit 32 (humidifier 304), and thus the maintenance of the humidifier 304 can be more effectively achieved. Furthermore, it is also possible to reduce the cost of maintaining the humidifier 304, which in turn reduces the running cost of the entire air conditioning system 1.

[0058] Furthermore, since there is no need to manually perform the water draining work, it is possible to more reliably prevent the waste of human resources.

[0059] Furthermore, if the resistivity measured by resistivity meter 23 falls below second lower limit LL, that is, if the amount of impurities in the water passing through outlet piping 28 has increased significantly and inappropriate water is being supplied from deionizers 21 and 22 to outdoor-conditioning unit 32, a predetermined warning will be issued by warning device 25. Therefore, predetermined measures (such as inspection of deionizers 21 and 22) can be taken early, and ultimately maintenance of humidifier 304 can be more effectively achieved.

[0060] Additionally, in this embodiment, the outdoor-conditioning unit controller 36 controls the control valves 34 and 35 in accordance with the dew-point temperature of the outdoor air (supply air dew-point temperature) supplied to the target space, thereby automatically adjusting the amount of pure water supplied to the humidification module 304a. This makes it possible to further stabilize the dew-point temperature of the outdoor air (supply air dew-point temperature) supplied to the target space.

[0061] Additionally, by controlling the control valves 34, 35, an appropriate amount of pure water can be supplied to the humidifier 304, which more reliably prevents a situation in which a large amount of pure water not used for humidification is discarded as drain. This reduces the amount of purified water in the pure water systems 21, 22, which in turn reduces the frequency of replacing consumables (such as RO membranes) in the pure water systems 21, 22. This effectively reduces the costs associated with operating the pure water systems 21, 22, and as a result, further reduces the running costs of the entire air conditioning system 1.

[0062] The present invention is not limited to the above-described embodiment, and may be implemented as follows: Of course, other applications and modifications not exemplified below are also possible.

[0063] (a) In the above embodiment, two deionizers 21 and 22 are provided, but the number of deionizers is not particularly limited. Therefore, for example, only one deionizer may be provided.

[0064] Furthermore, in the above embodiment, two outdoor air-conditioning units 3 are provided, but the number of outdoor air-conditioning units 3 can also be changed as appropriate.

[0065] (b) In the above embodiment, the pure water system controller 26 is configured to be able to detect the stop of the water treatment device 202 based on an operation signal sent from the water treatment device 202. Alternatively, the pure water system controller 26 may be configured to detect the stop of the water treatment device 202 based on the resistivity value measured by the resistivity meter 23. For example, the pure water system controller 26 may be configured to detect the stop of the water treatment device 202 based on the increase in the resistivity value within a certain period of time. Furthermore, the pure water system controller 26 may have a function to switch the water treatment device 202 between operation and stop, and may be configured to detect the stop of the water treatment device 202 based on that function.

[0066] (c) The water purifying apparatus side controller 26 may have a control circuit 29 mainly consisting of a relay and contacts, and this control circuit 29 may perform the automatic water draining process and warning execution process described above.

[0067] As shown in FIG. 8, the control circuit 29 includes a first lower limit value corresponding circuit 291, a second lower limit value corresponding circuit 292, a time measurement corresponding circuit 293, a discharge valve opening circuit 294, and a warning execution circuit 295 connected in parallel.

[0068] The first lower limit value corresponding circuit 291 is configured by connecting in series a switch 291a that is turned ON when the resistivity value measured by the resistivity meter 23 is equal to or lower than the first lower limit value L, and a first lower limit value corresponding relay 291b that is excited when the switch 291a is ON.

[0069] The second lower limit value corresponding circuit 292 is configured by connecting in series a switch 292a that is turned ON when the resistivity value measured by the resistivity meter 23 is equal to or lower than the second lower limit value LL, and a second lower limit value corresponding relay 292b that is excited when the switch 292a is ON.

[0070] The time measurement circuit 293 includes a switch 293a that is turned ON when the water treatment device 202 is stopped, a switch 293b that is turned ON when the discharge valve 24 is closed, a first stop time relay 293c that is activated when the switches 293a and 293b are ON and the stop time t measured by the timer 261 is equal to or greater than the first stop time T1, and a second stop time relay 293d that is activated when the switches 293a and 293b are ON and the stop time t is equal to or greater than the second stop time T2. In the time measurement circuit 293, the switches 293a and 293b are connected in series with the relays 293c and 293d that are connected in parallel. When the switches 293a and 293b are turned ON, the timer 261 starts measuring time.

[0071] The discharge valve opening circuit 294 includes a switch 294a that is turned ON when the first stop time corresponding relay 293c is energized, a switch 294b that is turned ON when the first lower limit value corresponding relay 291b is energized, a switch 294c that is turned ON when the second stop time corresponding relay 293d is energized, and a discharge valve control circuit 294d that opens the discharge valve 24 when the switches 294a and 294b are both ON or when the switch 294c is ON. In the discharge valve opening circuit 294, the switches 294a and 294b are connected in series, and the switch 294c is connected in parallel to the switches 294a and 294b, and the discharge valve control circuit 294d is connected in series to the switches 294a and 294b.

[0072] The warning execution circuit 295 is configured by connecting in series a switch 295a that turns ON when the second lower limit value corresponding relay 292b is excited, and a warning control circuit 295b that operates the warning device 25 when the switch 295a is ON.

[0073] According to the control circuit 29 described above, when the resistivity value measured by the resistivity meter 23 is equal to or less than the first lower limit L and the stop time t measured by the timer 261 is equal to or greater than the first stop time T1, the switches 294a and 294b are each turned ON, and the discharge valve control circuit 294d opens the discharge valve 24, unless the discharge valve 24 has already been opened. Furthermore, when the stop time t measured by the timer 261 is equal to or greater than the second stop time T2, the switch 294c is turned ON, and the discharge valve control circuit 294d opens the discharge valve 24, unless the discharge valve 24 has already been opened. In other words, the same automatic water draining process as in the above embodiment is performed.

[0074] Furthermore, according to the above-described control circuit 29, when the resistivity measured by the resistivity meter 23 is equal to or less than the second lower limit LL, the switch 295a is turned on. As a result, the warning control circuit 295b controls the operation of the warning device 25, and an abnormality is notified to the outside. In other words, the same warning execution process as in the above-described embodiment is performed. [Explanation of symbols]

[0075] 1...air conditioning system, 21...first pure water device (pure water device), 22...second pure water device (pure water device), 23...resistivity meter (resistivity value measuring means), 24...discharge valve, 25...warning device (warning means), 26...pure water device side controller (discharge valve control means), 28...outlet piping, 32...outdoor air conditioning unit, 33...air supply dew point thermometer (air supply dew point temperature measuring means), 34...first control valve (control valve), 35...second control valve (control valve), 36...outdoor air conditioning unit side controller (water supply amount control means), 202...water treatment device, 261...timer, 304...humidifier, 304a...humidification module.

Claims

1. an outdoor air conditioning unit having a humidifier capable of humidifying outdoor air and capable of humidifying the outdoor air taken in by the humidifier and supplying the humidified air to a target space; An air conditioning system including a water treatment device used to purify pure water and a water purification device capable of supplying pure water to the humidifier through a predetermined outlet pipe, a resistivity measuring means for measuring the resistivity of the water in the outlet pipe; A discharge valve provided in the outlet pipe and capable of switching whether or not to discharge water in the outlet pipe; a timer that measures the stop time of the water treatment device; a discharge valve control means capable of controlling the opening and closing of the discharge valve based on the resistivity value measured by the resistivity value measuring means and the stop time measured by the timer, The air conditioning system is characterized in that the discharge valve control means is configured to open the discharge valve to discharge water in the outlet piping when the resistivity value measured by the resistivity value measuring means becomes equal to or less than a predetermined first lower limit value L and the stop time measured by the timer becomes equal to or more than a predetermined first stop time T1, or when the stop time measured by the timer becomes equal to or more than a second stop time T2 that is longer than the first stop time T1.

2. The air conditioning system according to claim 1, further comprising a warning means for issuing a predetermined warning when the resistivity measured by the resistivity measuring means becomes equal to or less than a second lower limit value LL which is smaller than the first lower limit value L.

3. the humidifier is a drip pervaporation humidifier having a humidification module that can permeate moisture by dripping water, and that can humidify outside air by passing the outside air through the humidification module; a control valve capable of adjusting the amount of water supplied from the water purifier to the humidification module; a supply air dew point temperature measuring means for measuring a dew point temperature of outdoor air that passes through the humidification module and is supplied from the outdoor air-conditioning unit to the target space; 2. The air conditioning system according to claim 1, further comprising a water supply amount control means for proportionally controlling the opening of the control valve based on the dew point temperature measured by the supply air dew point temperature measuring means.

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