JP4121116B2 - Dehumidification and humidification system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dehumidification / humidification system capable of realizing dehumidification and humidification with a single system.
[0002]
[Prior art]
In air conditioning systems that maintain a constant temperature and humidity, when dehumidification is required, the supercooling dehumidification + reheating method is adopted, and in the field where lower humidity is required, a dry dehumidification method using a honeycomb type is adopted. ing. Further, in an important field of humidity management, the cassava method (Chugai Air System Co., Ltd.), which is a wet dehumidification method, is still used. Further, since lithium chloride as an absorbent used in the cassava method is a very stable substance, the cassava method is also used in hospitals and food-related air conditioning.
[0003]
[Problems to be solved by the invention]
However, the conventional air conditioning system as described above has the following problems. That is, the supercooling dehumidification + reheating method has the disadvantages of high energy consumption and high running cost.
In addition, the dry dehumidification method (honeycomb rotor method) has the disadvantages that the apparatus and ductwork are complicated, and the installation space becomes large. In addition, since the regeneration of the adsorbent is performed with air at a high temperature (at least 90 ° C. or more), there is a disadvantage that energy for heating is large.
[0004]
Furthermore, the cassava method, which is a wet dehumidification method, has a disadvantage that not only the installation space is increased because of the need for a regenerator, but the structure is complicated and the price is high. In addition, the cassava method is mainly dehumidified, does not consider the humidification system, and in the winter season when humidification is required, the regenerated portion is completely unnecessary. Further, in the cassava method, since cooling and dehumidification are performed simultaneously, all dehumidified moisture is absorbed in the lithium chloride solution. For this reason, there is a drawback that the amount of heating energy for releasing the moisture is increased. Further, in order to reduce the size of the lithium chloride solution heating regenerator, the heating energy temperature needs to be increased to, for example, 90 ° C. or more.
[0005]
The present invention has been proposed in order to solve the above-described problems of the prior art, and the object thereof is to realize dehumidification and humidification with a single system, which is low cost, space-saving, The object is to provide a dehumidifying / humidifying system capable of saving energy.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is the first water film comprising a vaporizing humidifying film having a predetermined gas-liquid contact area inside a chamber having a processing air intake port and a supply port. And a second water film, and a hygroscopic solution having a predetermined concentration is circulated between the two water films, and heating energy for heating the processing air is provided at the front stage of the first water film. A heating coil for supplying water is disposed, and between the first water film and the second water film, a cooling load and a heat amount necessary for dehumidification of moisture humidified by the processing air in the chamber are removed. A cooling coil is provided, and a dry bulb temperature sensor and a dew point temperature sensor are provided at the supply port of the processed air into the room, and the amount of cooling in the cooling coil is based on the detection value of the dry bulb temperature sensor. And a dew point temperature sensor. And a second control unit that controls the amount of heating in the heating coil based on the detection value, and the dehumidification / humidification system that controls the temperature and humidity at the supply port to be constant, the processing that is taken in from the intake port The air is composed of a mixture of outside air and return air supplied indoors from the supply port, and is in a dehumidifying mode. During cooling in summer, the processing air does not require the operation of the heating coil and the first water. Simultaneously with the humidification in the membrane, the concentration of the hygroscopic solution is increased, and the first control unit controls the cooling amount of the cooling coil to cool the processing air, and in the second water membrane concentration of dehumidified is simultaneously the moisture-absorbing and desorbing solution is low, at the time of the interim cooling, said second control unit for lowering the relative humidity of the process air by controlling the heating amount of said heating coil Heating, at the same time the process air is humidified in the first water film, the concentration of the moisture-absorbing and desorbing solution increased further, the first control unit controls the cooling amount of the cooling coil the process air is cooled, and at the same time the process air Ru dehumidified in the second water film, the concentration of the previous term moisture sorption solution is lowered, a humidifying mode, during winter heating, the second control unit heats the process air by controlling the heating amount of said heating coil, that the process air is humidified in the first water film, is configured so that further humidified in the second water film It is characterized by.
[0008]
According to the invention described in claim 1 having such a configuration, when the dehumidification mode, the first water layer acts as a humidification unit (reproduction unit), a second water film functions as a dehumidifier. On the other hand, in the humidification mode, since both the first water film and the second water film function as a humidifying unit, the temperature of the cooling water supplied to the cooling coil can be increased, and also supplied to the heating coil. The temperature of the hot water to be used can be lowered.
[0009]
According to a second aspect of the invention, the dehumidification and humidification system of claim 1, during the system, the concentration of the moisture-absorbing and desorbing solution is characterized in that it is configured to be kept constant .
[0010]
According to a third aspect of the invention, in the invention of the second aspect , the means for keeping the concentration of the hygroscopic solution constant keeps the water level in the water tank provided below the first water film constant. It is characterized in that a predetermined amount of makeup water is supplied into the water tank so as to be held in the water tank.
[0011]
According to a fourth aspect of the present invention, in the second aspect of the present invention, the means for keeping the concentration of the hygroscopic solution constant is based on the detection value of the dew point temperature sensor. It is characterized by controlling the amount of makeup water supplied into a water tank provided at the lower part.
[0012]
According to the second to fourth aspects of the invention having the above-described configuration, the concentration of the hygroscopic solution circulated in the system can be kept constant. It is easy to keep the relative humidity at a constant.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.
(1) First Embodiment (1-1) Configuration The dehumidifying and humidifying system of this embodiment is configured as shown in FIG. That is, a prefilter 1, a medium performance filter 2, a heating coil 3, a first water film 4, a cooling coil 5, and a second water are disposed in a chamber (not shown) having a processing air intake port and a supply port. A membrane 6 and a blower 7 are sequentially provided. Further, the supply port is provided with a dry bulb temperature sensor Pt and a dew point temperature sensor DP, and each detection result is sent to the first control unit 8 and the second control unit 9.
[0014]
The first water film 4 and the second water film 6 are both composed of a vaporizing humidifying film having a sufficient gas-liquid contact area, and a lithium chloride solution that is a hygroscopic solution between the two water films. It is configured to be circulated. That is, the lithium chloride solution discharged from the second water film 6 is configured to be dripped from the upper part of the first water film 4 through the first pipe 10 provided with the first pump P1. ing. The lithium chloride solution discharged from the first water film 4 is configured to be dropped from the upper part of the second water film 6 through the second pipe 11 provided with the second pump P2. ing.
[0015]
Further, the first water tank 12 provided in the lower part of the first water film 4 and the second water tank 13 provided in the lower part of the second water film 6 are connected by a communication pipe 14. In addition, a makeup water supply line 15 is connected to the first water tank 12, and the water level in the first water tank 12 can be maintained constant by a ball tap 16. As a result, the concentration of the lithium chloride solution circulating in the system can be maintained almost constant.
[0016]
Furthermore, a hot water supply line 18 having a first valve 17 is connected to the heating coil 3, and a cold water supply line 20 having a second valve 19 is connected to the cooling coil 5.
The second valve 19 is controlled by the first control unit 8 that sends a control signal based on the detection result of the dry bulb temperature sensor Pt, and the control signal is based on the detection result of the dew point temperature sensor DP. The first valve 17 is controlled by the second control unit 9 that sends
[0017]
In addition, as said 1st and 2nd water films 4 and 6, it is desirable to use a thing with humidification saturation efficiency near 100%. The initial concentration of the lithium chloride solution supplied to the first and second water films 4 and 6 is appropriately set in accordance with the set humidity at the outlet of the air conditioner to which the present system is applied. It is desirable to set it to 16 to 20%.
[0018]
(1-2) Actions / Effects The actions of the dehumidification / humidification system of the present embodiment having the above-described configuration are the same as in the summer cooling / dehumidification mode, in the winter humidification mode, and in the intermediate period cooling / dehumidification mode. Each will be described separately.
In the embodiment described below, the processing air introduced into the air conditioner to which the present system is applied is a mixture of outside air and indoor return air (1: 1). The indoor set temperature is assumed to be 23 ° C. and 45%, and the air control at the outlet of the air conditioner is controlled to be constant at 16 ° C. and 70% (DP = 11 ° C. at this time). At this time, the set dry bulb temperature of the first control unit 8 is 16 ° C., and the set dew point temperature of the second control unit 9 is 11 ° C.
[0019]
Further, the first pump P1 and the second pump P2 are always operated, and the hot water temperature supplied to the heating coil 3 is supplied to the cooling coil 5, for example, at a cooling water temperature of 34 ° C. in a turbo chiller operation in winter. The cold water temperature is 9.5 ° C. Further, the water level of the first water tank 12 is set so that the concentration of the lithium chloride solution is 20%.
[0020]
(A) Summer First, the summer cooling and dehumidification modes will be described with reference to FIG. For example, in the dehumidification mode in summer when the outside air is 34 ° C. and the relative humidity is 60% (point a in FIG. 2), the processing air taken into the air conditioner to which this system is applied is outside air (in FIG. 2). Since it is 1: 1 mixed air of the return air from the room (point a) and the return air (point b in FIG. 2), the point c in FIG. 2 (28.5 ° C., 58% RH) is obtained. This processing air is taken into the chamber through the prefilter 1 and the medium performance filter 2.
[0021]
In this case, as is apparent from FIG. 3 showing the equilibrium vapor diagram of the lithium chloride solution, the relative humidity of the outlet air that contacts the 20% lithium chloride solution through the water film 4 is 70%. The processing air is humidified in the water film 4 and becomes 27 ° C. and 70% (point d in FIG. 2). Note that the concentration of the lithium chloride solution in the first water tank 12 is increased by the humidifying operation in the first water film 4.
[0022]
Subsequently, the first control unit 8 based on the dry bulb temperature sensor Pt opens the second valve 19, and chilled water of 9.5 ° C. is supplied to the cooling coil 5, thereby processing air at 14.5 ° C. And is dehumidified (the absolute humidity decreases from 0.016 to 0.010 kg / kg), and becomes RH 98% (point e in FIG. 2).
This treated air is then sent to the second water film 6, but as shown in FIG. 3, the relative humidity of the outlet air in contact with the 20% lithium chloride solution is 70%. In the water film 6, the treated air is dehumidified to 16 ° C. and 70% (point f in FIG. 2).
[0023]
The state of the outside air (point a in FIG. 2) changes from moment to moment, and the points c, d, and e in FIG. 2 also change accordingly, but the outlet state of the air conditioner to which this system is applied (Point f in FIG. 2) is the first valve 17 and the second valve 17 so that the dry bulb temperature is 16 ° C. and the dew point temperature is 11 ° C., which are the set values of the first controller 8 and the second controller 9. By controlling the second valve 19, the f-point in FIG. 2 is maintained.
In the second water film 6, the lithium chloride solution having a reduced concentration by absorbing moisture in the processing air is dropped from the upper part of the first water film 4 through the first pipe 10, By passing through a humidifying step in one water film 4, water is released and regenerated.
[0024]
Thus, in the air conditioning apparatus to which the present system is applied, in the summer dehumidifying mode, the first water film 4 functions as a humidifying part (regenerating part), and the second water film 6 functions as a dehumidifying part. . Moreover, the cooling water supplied to the cooling coil 5 may be about 9.5 ° C., and the temperature of the cooling water can be increased as compared with the conventional cooling water (7 ° C.).
[0025]
Here, the action and effect of this embodiment in the summer season (cooling and dehumidification) are the same as those of the conventional supercooling dehumidification + reheating type air conditioner (hereinafter referred to as the conventional type) having the configuration shown in FIG. This will be explained in comparison with an air conditioner.
That is, the conventional air conditioner has a pre-filter 31, a medium performance filter 32, a cooling coil 33, a heating coil 34, and a steam humidifier 35 inside a chamber (not shown) having a processing air intake port and a supply port. The blower 36 is sequentially provided. Further, a dry bulb temperature sensor Pt and a dew point temperature sensor DP are provided in the vicinity of the indoor side of the supply port, and each detection result is sent to the first control unit 37 and the second control unit 38. ing.
[0026]
Further, a chilled water supply line 40 having a first valve 39 is connected to the cooling coil 33, and a hot water supply line 42 having a second valve 41 is connected to the heating coil 34. The steam humidifier 35 is connected to a steam supply line 44 having a third valve 43.
[0027]
Then, the first valve 39 and the second valve 41 are controlled by the first control unit 37 that sends out a control signal based on the detection result of the dry bulb temperature sensor Pt, and the dew point temperature sensor DP is detected. The first valve 39 and the third valve 43 are controlled by a second control unit 38 that sends a control signal based on the result.
[0028]
In the conventional air conditioner having such a configuration, the outside air is 34 ° C. and the relative humidity is 60%. The outside air (point a in FIG. 5) and the return air from the room (point b in FIG. 5) are 1: 1. When the mixed air is taken in, the first valve 39 is opened by the second control unit 38 that sends out a control signal based on the detection result of the dew point temperature sensor DP, and cold water of 7 ° C. is supplied to the cooling coil 33. As a result, the processing air is cooled to 11 ° C. and dehumidified (the absolute humidity is decreased from 0.014 to 0.008 kg / kg) to reach RH 98% (point d in FIG. 5). Subsequently, the second valve 41 is opened by the first control unit 37, and hot water of 34 ° C. is supplied to the heating coil 34, whereby the processing air is 16 ° C. and 70% (point e in FIG. 5). It becomes.
As described above, in the conventional air conditioner, the cold water supplied to the cooling coil 33 requires cold water having a lower temperature than that in the present embodiment.
[0029]
(B) Next to winter, the heating and humidification modes in winter will be described with reference to FIG. For example, in the humidification mode in winter when the outside air is 0 ° C. and the relative humidity is 30% (point a in FIG. 6), the treated air taken into the air conditioner to which the present system is applied is outside air (a in FIG. 6). Point) and return air from the room (point b in FIG. 6) is 1: 1 mixed air, and therefore, point c in FIG. 6 (11.5 ° C., 50% RH) is obtained. This processing air is taken into the chamber through the prefilter 1 and the medium performance filter 2.
[0030]
In this case, the second controller 9 based on the dew point temperature sensor DP opens the first valve 17 so that the dew point temperature at the outlet of the air conditioner to which the present system is applied is 11 ° C., and the heating coil 3 Is supplied with warm water (34 ° C.). Thus, the processing air is heated to 24 ° C. and 25% (point d in FIG. 6).
[0031]
Here, the control of the opening degree of the first valve 17 by the second control unit 9 will be described with reference to FIG. That is, the second control unit 9 sends out a predetermined control signal based on the difference from the set value based on the detection value of the dew point temperature sensor DP, but as shown in FIG. The first valve 17 is opened and hot water (34 ° C.) is supplied to the heating coil 3 not only when the detected value of the dew point temperature sensor DP is lower than the set temperature (here, 11 ° C.) but also when the detected value is higher. Is done. Note that the opening degree of the first valve 17 is configured to increase as the difference between the set temperature of the dew point temperature sensor DP and the actual detected temperature increases.
[0032]
As described above, in the summer, the first water film 4 serves as a humidifying part, and the second water film 6 serves as a dehumidifying part, and the concentration of the lithium chloride solution is kept constant. Both the water film 4 and the second water film 6 serve as a humidifying part. Accordingly, the treated air is humidified by the first water film 4 to about 18 ° C. and 52% (point e in FIG. 6), and further humidified by the second water film 6 to 16 ° C. and 70% ( F point in FIG. 6).
[0033]
The state of the outside air (point a in FIG. 6) changes from moment to moment, and the points c, d, and e in FIG. 6 also change accordingly, but the outlet state of the air conditioner to which this system is applied (Point f in FIG. 6) is the first valve 17 and the first valve 17 so that the dry bulb temperature is 16 ° C. and the dew point temperature is 11 ° C., which are set values of the first controller 8 and the second controller 9. The second valve 19 is controlled to maintain the point f in FIG.
[0034]
Although the water level of the lithium chloride solution in the first water tank 12 and the second water tank 13 is lowered by the humidifying operation in the first water film 4 and the second water film 6 as described above, the ball tap 16 The makeup water is appropriately supplied from the makeup water supply line 15, and the concentration (20%) and the water level of the lithium chloride solution in the first water tank 12 and the second water tank 13 are maintained constant.
[0035]
Thus, in the air conditioning apparatus to which the present system is applied, in the humidification mode in winter, both the first water film 4 and the second water film 6 function as a humidifying unit. Further, the hot water supplied to the heating coil 3 may be low-temperature water of about 34 ° C., and cooling water in the operation of the centrifugal chiller in winter can be used, so that a highly efficient humidification system can be obtained.
[0036]
Here, the operation and effect of the present embodiment in winter (heating and humidification) will be described in comparison with a conventional air conditioner having a configuration as shown in FIG.
That is, the conventional air conditioner has a 1: 1 mixed air of outside air at 0 ° C. and relative humidity of 30% (point a in FIG. 7) and return air from the room (point b in FIG. 7). When incorporated, the first control unit 37 based on the dry bulb temperature sensor Pt opens the second valve 41 and supplies hot water (34 ° C.) to the heating coil 34. As a result, the processing air is heated to 15 ° C. and 40% (point d in FIG. 7).
[0037]
Subsequently, the third valve 43 is opened by the second control unit 38 that sends a control signal based on the detection result of the dew point temperature sensor DP, and steam of about 110 ° C. is supplied to the steam humidifier 35. Thereby, the processing air is humidified to 16 ° C. and 70% (point e in FIG. 7).
[0038]
However, in the case of a conventional air conditioner, in order to obtain humidified steam to be supplied to the steam humidifier 35, a large amount of energy such as gas and kerosene is required, and steam is absorbed downstream of the steam humidifier 35. Since a space of 1500 to 2000 mm is required as the distance, the apparatus has been enlarged, but such a problem does not occur in the dehumidifying / humidifying system of this embodiment.
[0039]
(C) Next to the intermediate period, the cooling and dehumidifying modes in the intermediate period will be described with reference to FIG. For example, in an intermediate humidity reduction mode in which the outside air is 17 ° C. and the relative humidity is 90% (point “a” in FIG. 9), the treated air taken into the air conditioner to which the present system is applied is outside air (in FIG. 9). 9) and the return air from the room (point b in FIG. 9) is 1: 1 mixed air, and therefore, the point c in FIG. 9 (20 ° C., 65% RH) is obtained. This processing air is taken into the chamber through the prefilter 1 and the medium performance filter 2.
[0040]
In this case, the second control unit 9 based on the dew point temperature sensor DP opens the first valve 17 and supplies hot water (34 ° C.) to the heating coil 3. As a result, the processing air is heated to 23 ° C. and 55% (point d in FIG. 9).
Further, as shown in FIG. 3, since the relative humidity of the outlet air that contacts the 20% lithium chloride solution is 70%, the processing air is humidified in the first water film 4, and is 21 ° C. and 70% (FIG. 9). Middle e). The lithium chloride solution is regenerated by releasing moisture by the humidifying operation in the first water film 4.
[0041]
Subsequently, the first control unit 8 based on the dry bulb temperature sensor Pt opens the second valve 19, and 9.5 ° C. cold water is supplied to the cooling coil 5. And is dehumidified (the absolute humidity is decreased from 0.011 to 0.0095 kg / kg) to reach RH 98% (point f in FIG. 9).
[0042]
This treated air is then sent to the second water film 6, but as shown in FIG. 3, the relative humidity of the outlet air in contact with the 20% lithium chloride solution is 70%. In the water film 6, the treated air is dehumidified to 16 ° C. and 70% (g point in FIG. 9).
In the second water film 6, the lithium chloride solution having a reduced concentration by absorbing moisture in the processing air is dropped from the upper part of the first water film 4 through the first pipe 10, By passing through a humidifying step in one water film 4, water is released and regenerated.
[0043]
As described above, in the air conditioner to which the present system is applied, in the dehumidification mode in the intermediate period, the first water film 4 functions as a humidification unit (regeneration unit), and the second water film 6 functions as a dehumidification unit. To do. Further, the cooling water supplied to the cooling coil 5 may be about 9.5 ° C., and the cold water temperature can be made higher than that of the conventional cooling water (7 ° C.).
[0044]
(2) Other Embodiments The present invention is not limited to the above-described embodiments, and various modes as shown below are possible. Specific shapes of members, mounting positions and methods are as follows. It can be changed as appropriate. For example, in the above embodiment, the supply water supply to the first water tank is controlled by the ball tap 16 provided in the first water tank 12, but a valve (not shown) is provided in the supply water supply line 15. ) And adjusting the opening degree of the valve by a signal from the second control unit 9 so that the concentration of the lithium chloride solution can be kept constant.
[0045]
Moreover, the vaporization type humidification film | membrane should just be a material which has hydrophilicity or water absorption, and a moisture absorption / release solution can wet the surface. In the above embodiment, the lithium chloride solution is used as the moisture absorbing / releasing solution, but a liquid absorbent such as a lithium bromide solution may be used.
[0046]
【The invention's effect】
As described above, according to the present invention, dehumidification and humidification can be realized with a single system, and a dehumidification / humidification system that can achieve low cost, space saving, and energy saving can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a configuration of a first embodiment of a dehumidifying / humidifying system according to the present invention. FIG. 2 is an air line diagram showing an action in summer of the dehumidifying / humidifying system according to the present invention. Equilibrium vapor diagram of the solution [Fig. 4] Schematic diagram showing the configuration of a conventional steam humidification type air conditioner [Fig. 5] Shows the action of a conventional steam humidification type air conditioner in summer Air diagram [Fig. 6] Air diagram showing the operation in winter of the dehumidification / humidification system according to the present invention [Fig. 7] Air diagram showing the operation in winter of the steam humidification type air conditioner used conventionally [ FIG. 8 is a diagram showing the control of the opening degree of the first valve by the second control unit. FIG. 9 is an air line diagram showing the operation in the intermediate period of the dehumidification / humidification system according to the present invention.
DESCRIPTION OF SYMBOLS 1 ... Pre filter 2 ... Medium performance filter 3 ... Heating coil 4 ... 1st water film 5 ... Cooling coil 6 ... 2nd water film 7 ... Blower 8 ... 1st control part 9 ... 2nd control part 10 ... 1st piping 11 ... 2nd piping 12 ... 1st water tank 13 ... 2nd water tank 14 ... Communication pipe 15 ... Supply water supply line 16 ... Ball tap 17 ... 1st valve 18 ... Hot water supply line 19 ... 2nd Valve 20 ... Cold water supply line

Claims (5)

A chamber having a processing air inlet and a supply port is provided with a first water film and a second water film made of a vaporizing humidifying film having a predetermined gas-liquid contact area. A hygroscopic solution having a concentration is circulated, and a heating coil for supplying heating energy for heating the processing air is disposed in front of the first water film, and the first water film is provided. A cooling coil for removing heat necessary for dehumidification of the moisture humidified by the processing air in the chamber and the cooling load is disposed between the second water film and the second water film, and supply of the processed air to the room The mouth is provided with a dry bulb temperature sensor and a dew point temperature sensor. Based on a detection value of the dry bulb temperature sensor, a first control unit that controls a cooling amount in the cooling coil, and a detection of the dew point temperature sensor Heating amount in the heating coil based on the value And a second control unit for controlling, in dehumidification and humidification system for controlling the temperature and humidity in the supply port constant,
The processing air taken in from the intake port is composed of a mixture of outside air and return air supplied into the room from the supply port,
In dehumidification mode,
During cooling in summer, the processing air is humidified in the first water film without requiring operation of a heating coil, and at the same time, the concentration of the hygroscopic solution is increased, and the first control unit performs the cooling. The cooling amount of the coil is controlled to cool the processing air, and the concentration of the hygroscopic solution is reduced at the same time that the moisture is dehumidified in the second water film ,
During cooling in the intermediate period, the second control unit controls the amount of heating of the heating coil to heat to reduce the relative humidity of the processing air, and the processing air is humidified in the first water film. At the same time, the absorbing concentration of moisture solution increased further, the first control unit to cool the process air by controlling the cooling amount of the cooling coil, the process air is the second water film at the same time Ru dehumidified in the concentration of the previous term moisture sorption solution is low,
A humidification mode, during winter heating, the second control unit heats the process air by controlling the heating amount of said heating coil, the process air is humidified in the first water film, further dehumidification and humidification system, characterized in that configured so that humidified in the second water film.   The dehumidifying / humidifying system according to claim 1, wherein the concentration of the hygroscopic solution is kept constant in the system.   A means for keeping the concentration of the hygroscopic solution constant supplies a predetermined amount of make-up water into the water tank so that the water level in the water tank provided below the first water film is kept constant. The dehumidifying / humidifying system according to claim 2, wherein the dehumidifying / humidifying system is one.   The means for keeping the concentration of the hygroscopic solution constant controls the amount of replenishment water supplied into a water tank provided under the first water film based on the detection value of the dew point temperature sensor. The dehumidifying / humidifying system according to claim 2.   The dehumidifying / humidifying system according to any one of claims 1 to 4, wherein the moisture absorbing / releasing solution is a lithium chloride solution.

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