JP2023134931A - Ventilation device - Google Patents

Abstract

To improve humidity conditioning efficiency.SOLUTION: A ventilation device 10 which supplies the outside air to an inner space SP2 from an outer space SP1, and which exhausts return air to the outer space SP1 from the inner space SP2 includes: a humidity conditioning part 12 for adjusting humidity of the outside air and the return air; and a control part 17 for controlling the humidity control part 12. The humidity control part 12 includes: a humidity adsorbing region A1 for adsorbing moisture of one of the outside air and the return air; a humidity discharge region A2 for discharging moisture to the other of the outside air and the return air; a switching mechanism 56 for switching the humidity adsorbing region A1 to the humidity discharge region A2, and the humidity discharge region A2 to the humidity adsorbing region A1 respectively at every switching time Z1; and a heating mechanism 51 for heating the humidity discharge region A2. In the ventilation device 10, the higher absolute humidity H1 of the air flowing into the humidity adsorbing region A1 is, the shorter the control part 17 makes the switching time Z1.SELECTED DRAWING: Figure 7

Description

TECHNICAL FIELD This disclosure relates to ventilation devices.

2. Description of the Related Art Ventilators are known that control the humidity of an indoor space while ventilating the indoor space. Patent Document 1 discloses a ventilation device that performs a dehumidifying operation or a humidifying operation using a first adsorption heat exchanger and a second adsorption heat exchanger each carrying an adsorbent. The ventilation device of Patent Document 1 continuously performs the dehumidification operation or the humidification operation by repeating the first operation and the second operation alternately at predetermined time intervals (for example, every 3 minutes). This time interval is also referred to as "batch time". Switching between the first operation and the second operation is performed, for example, by a four-way switching valve.

Here, regarding the dehumidification operation, the first operation is that the outside air that has passed through the second adsorption heat exchanger that functions as an evaporator is supplied to the indoor space, and the return air that has passed through the first adsorption heat exchanger that functions as a condenser. This is an operation in which water is discharged into the outdoor space. In the first operation, moisture in the outside air is dehumidified by being adsorbed by the adsorbent in the second heat-of-adsorption exchanger, and moisture is released from the adsorbent in the first heat-of-adsorption exchanger into the return air.

Regarding the dehumidifying operation, in the second operation, outside air that has passed through the first adsorption heat exchanger that functions as an evaporator is supplied to the indoor space, and return air that has passed through the second adsorption heat exchanger that functions as a condenser is supplied to the indoor space. This is the action of discharging water into the outdoor space. In the second operation, moisture in the outside air is dehumidified by being adsorbed by the adsorbent in the first heat-of-adsorption exchanger, and moisture is released from the adsorbent in the second heat-of-adsorption exchanger into the return air.

JP 2021-71209 Publication

In conventional ventilation systems, the batch time is a fixed value. In Patent Document 1, the batch time during dehumidification operation is set to a first fixed value (for example, 3 minutes), and the batch time during humidification operation is set to a second fixed value (for example, 3 minutes). The fixed value is, for example, a value obtained through a test as an optimum value under rated conditions.

However, if the batch time is set to a fixed value, if the air to be absorbed (outside air for dehumidification operation, return air for humidification operation) is more humid than the rated conditions, the amount of water retained by the adsorbent may reach saturated or near-saturated moisture content within the batch time. In this case, after the adsorbent approaches a saturated state, the amount of moisture adsorbed by the adsorbent decreases, resulting in a decrease in humidity control efficiency.

The present disclosure was made in view of the above problems, and aims to improve humidity control efficiency.

(1) The ventilation device of the present disclosure is a ventilation device that supplies outside air from an outdoor space to an indoor space and discharges return air from the indoor space to the outdoor space, and the ventilation device controls the humidity of the outside air and the return air. The humidity control section includes a humidity control section that adjusts moisture, and a control section that controls the humidity control section. a moisture release area that releases moisture to the other side; a switching mechanism that switches the moisture absorption area to the moisture release area and the moisture release area to the moisture absorption area at each switching time; and heating that heats the moisture release area. The ventilation device includes a mechanism, wherein the control section shortens the switching time as the absolute humidity of the air flowing into the moisture absorption area is higher.

The higher the absolute humidity, the shorter the switching time, so the controller can switch the moisture absorption area to the moisture release area before the moisture content in the moisture absorption area is saturated (or shortly after the moisture content has been saturated). can. In this way, the switching mechanism can be controlled using a switching time suitable for the moisture absorption state of the moisture absorption region, so that the humidity control efficiency in the humidity control section can be improved.

(2) The control unit further includes a casing that houses the humidity control unit and is formed with an outside air intake that takes in the outside air and a return air intake that takes in the return air, and the control unit is configured such that the moisture absorption area is When adsorbing moisture in the outside air, the absolute humidity is acquired based on the detection result of the outside air side detection unit that detects the temperature and humidity of the air closer to the outside air intake than the moisture absorption area, and the moisture absorption area is When adsorbing moisture in the return air, the absolute humidity is acquired based on the detection result of a return air side detection unit that detects the temperature and humidity of the air closer to the return air intake than the moisture absorption area.

With this configuration, it is possible to obtain the absolute humidity of the air flowing into the moisture absorption area.

(3) The control unit sets the switching time to the first time when the absolute humidity is less than or equal to the first predetermined value, and sets the switching time to the first time when the absolute humidity exceeds the first predetermined value. The second time is shorter than the first time.

The higher the absolute humidity, the shorter the switching time is in stages, so the processing load for obtaining the switching time on the control unit can be reduced.

(4) The control unit controls the switching time to a value equal to or greater than a lower limit value.

If the switching time is extremely short, switching in the switching mechanism will occur frequently, and the temperatures of the first and second heat exchangers will become unstable, which may actually reduce the humidity control efficiency in the humidity control section. be. Furthermore, if switching occurs frequently in the switching mechanism, there is a risk that the life of the switching mechanism will be shortened. Therefore, when the absolute humidity becomes higher than a certain level, the control unit controls the switching mechanism by uniformly setting the switching time to the lower limit value. Thereby, it is possible to suppress a decrease in humidity control efficiency due to frequent switching of the switching mechanism, and to suppress the switching mechanism from becoming short-lived.

(5) The control unit includes a first mode in which the lower limit value is a first value, and a second mode in which the lower limit value is a second value larger than the first value X1. It can be set to the following mode.

By setting the lower limit value according to the mode, the switching mechanism can be controlled more suitably according to the user's wishes. For example, it is possible to suppress a decrease in humidity control efficiency due to frequent switching of the switching mechanism, and to suppress the switching mechanism from becoming short-lived.

(6) The control unit includes a memory storing time information linking the absolute humidity and the switching time, and the control unit determines the switching time based on the absolute humidity and the time information. get.

Since the switching time can be obtained based on the time information stored in the memory, the processing load for obtaining the switching time on the control unit can be reduced.

(7) The humidity control section is a refrigerant circuit including a first heat exchanger provided with a first adsorbent and a second heat exchanger provided with a second adsorbent, and The mechanism switches the flow of refrigerant in the refrigerant circuit between a first operation and a second operation, and in the first operation, the first heat exchanger becomes a condenser and the second heat exchanger becomes an evaporator. In the second operation, the second heat exchanger becomes a condenser, the first heat exchanger becomes an evaporator, and the second adsorbent becomes a moisture release region. The heating mechanism is a heat exchanger of the first heat exchanger and the second heat exchanger that functions as a condenser.

In this way, the ventilation device of the present disclosure can be applied to a so-called heat pump desiccant type ventilation device.

(8) The switching mechanism is a motor that moves the moisture absorption area and the moisture release area by rotating an adsorption member containing an adsorption agent.

In this way, the ventilation device of the present disclosure can be applied to a so-called desiccant rotor type ventilation device.

FIG. 1 is a plan view schematically showing the internal configuration of a ventilation device according to an embodiment. FIG. 1 is a plan view schematically showing the internal configuration of a ventilation device according to an embodiment. FIG. 2 is a side view schematically showing the internal configuration of the ventilation device as seen from arrow III in FIG. 1. FIG. FIG. 2 is a side view schematically showing the internal configuration of the ventilation device as seen from arrow IV in FIG. 1. FIG. It is a piping system diagram showing a refrigerant circuit concerning an embodiment. It is a piping system diagram showing a refrigerant circuit concerning an embodiment. 3 is a flowchart showing a control method according to an embodiment. It is a graph showing an example of the relationship between absolute humidity and batch time. It is a graph showing an example of the relationship between absolute humidity and batch time. It is a table showing an example of time information linking absolute humidity and batch time. It is a figure which shows typically the humidity control part based on a modification.

Embodiments of the present disclosure will be described below with reference to the accompanying drawings.

[Embodiment]
[Overall configuration of ventilation system 10]
1 and 2 are plan views schematically showing the internal configuration of a ventilation device 10 according to an embodiment. 3 is a side view schematically showing the internal configuration of the ventilation device 10 as seen from arrow III in FIG. 1, and FIG. 4 is a side view schematically showing the internal structure of the ventilation device as seen from arrow IV in FIG. FIG.

An XYZ orthogonal coordinate system is attached to FIGS. 1 to 4 for explanation. In the following description, the Z direction will be referred to as the up-down direction, and the positive side of the Z direction will be referred to as the upper side, and the negative side will be referred to as the lower side. Note that these directions do not have to match the directions when the ventilation device 10 is installed in the facility. For example, the Y direction may be the vertical direction.

The ventilation device 10 is a device that ventilates the indoor space SP2 while controlling the humidity using a heat pump desiccant method. The ventilation device 10 is installed, for example, in the ceiling of a room forming the indoor space SP2. The ventilation device 10 includes a casing 11 including an air supply passage 31 and an exhaust passage 32, a humidity control section 12, an air supply fan 13, an exhaust fan 14, an opening/closing mechanism 16, a control section 17, and an outside air side detection section. 61 and a return air side detection section 62. The casing 11 houses these parts 12 to 14, 16, 17, 61, and 62.

Please refer to FIGS. 1 and 2. The casing 11 has a rectangular planar shape and is formed in the shape of a flat rectangular parallelepiped box. The casing 11 includes an outside air intake port 21 that takes in outside air (OA) from the outdoor space SP1, an air supply outlet 22 that blows out supply air (SA) into the indoor space SP2, and takes in return air (RA) from the indoor space SP2. A return air intake port 23 and an exhaust air outlet 24 that blows out exhaust air (EA) into the outdoor space SP1 are formed. The outside air intake port 21 and the return air intake port 23 are formed, for example, on the same surface of the casing 11.

The casing 11 includes a first partition wall 11a and a second partition wall 11b. As shown in FIGS. 3 and 4, the first partition wall 11a partitions the space inside the casing 11 into an upper space SP3 and a lower space SP4. The second partition wall 11b partitions the upper space SP3 into an outdoor side and an indoor side, and partitions the lower space SP4 into an outdoor side and an indoor side.

The air supply passage 31 is a passage through which air is supplied from the outdoor space SP1 to the indoor space SP2. The air supply passage 31 allows the outside air intake port 21 and the air supply outlet 22 to communicate with each other via the humidity control section 12. The air supply passage 31 includes a first air supply passage 31 a on the outdoor side of the humidity control section 12 and a second air supply passage 31 b on the indoor side of the humidity control part 12 . The first air supply passage 31a is formed in the lower space SP4, and the second air supply passage 31b is formed in the upper space SP3. That is, when the air supply passage 31 passes through the humidity control unit 12 from the outdoor side to the indoor side, it moves from the lower space SP4 to the upper space SP3.

The exhaust passage 32 is a passage through which air is discharged from the indoor space SP2 to the outdoor space SP1. The exhaust passage 32 communicates the return air intake 23 and the exhaust outlet 24 via the humidity control section 12. The exhaust passage 32 includes a first exhaust passage 32 a on the indoor side of the humidity control section 12 and a second exhaust passage 32 b on the outdoor side of the humidity control part 12 . The first exhaust passage 32a is formed in the upper space SP3, and the second exhaust passage 32b is formed in the lower space SP4. That is, when the exhaust passage 32 passes through the humidity control section 12 from the indoor side to the outdoor side, it moves from the upper space SP3 to the lower space SP4.

The first exhaust passage 32a is provided above the first air supply passage 31a via the first partition wall 11a. Further, the second exhaust passage 32b is provided below the second air supply passage 31b via the first partition wall 11a. That is, the air supply passage 31 and the exhaust passage 32 both cross in the vertical direction while flowing air on the negative side in the X direction.

The humidity control unit 12 is a unit that adjusts the humidity of outside air to generate supply air, and specifically, is a refrigerant circuit that executes a vapor compression refrigeration cycle by circulating refrigerant. The humidity control unit 12 is provided near the center of the casing 11 in the X direction, and together with the second partition wall 11b, divides the upper space SP3 and the lower space SP4 into an outdoor side and an indoor side. Humidity control section 12 includes a first heat exchanger 51 and a second heat exchanger 52. The first heat exchanger 51 and the second heat exchanger 52 are arranged, for example, in a line in the Y direction.

The air supply fan 13 is provided near the air supply outlet 22 . The air supply fan 13 is, for example, a sirocco fan, and rotates based on a control command from the control unit 17. When the air supply fan 13 rotates, air (outside air) in the outdoor space SP1 is taken into the casing 11 from the outside air intake port 21, passes through the air supply passage 31, and is blown out from the air supply outlet 22.

The exhaust fan 14 is provided near the exhaust outlet 24. The exhaust fan 14 is, for example, a sirocco fan, and rotates based on a control command from the control unit 17. When the exhaust fan 14 rotates, air (return air) in the indoor space SP2 is taken into the casing 11 from the return air intake port 23, passes through the exhaust passage 32, and is blown out from the exhaust outlet 24.

The opening/closing mechanism 16 is provided in the air supply passage 31 and the exhaust passage 32, and is a mechanism that controls communication between the air supply passage 31 and the exhaust passage 32 and the humidity control section 12 based on a control command from the control section 17. . The opening/closing mechanism 16 includes a plurality of (eight in this embodiment) dampers 41 to 48. These dampers 41 to 48 open and close independently based on control commands from the control section 17.

As shown in FIG. 1, the damper 41 is provided between the first air supply passage 31a and the first heat exchanger 51. The damper 42 is provided between the first air supply passage 31a and the second heat exchanger 52. The damper 43 is provided between the second air supply passage 31b and the first heat exchanger 51. The damper 44 is provided between the second air supply passage 31b and the second heat exchanger 52.

As shown in FIG. 2, the damper 45 is provided between the first exhaust passage 32a and the first heat exchanger 51. The damper 46 is provided between the first exhaust passage 32a and the second heat exchanger 52. The damper 47 is provided between the second exhaust passage 32b and the first heat exchanger 51. The damper 48 is provided between the second exhaust passage 32b and the second heat exchanger 52.

The control unit 17 includes a processor 17a and a memory 17b. The processor 17a includes, for example, one or more CPUs (Central Processing Units). The processor 17a may be a GPU (Graphics Processing Unit). By the processor 17a performing various calculations and processes based on the programs included in the memory 17b, the control unit 17 executes various controls described below.

Note that the processor 17a is a CPLD (Complex Programmable Logic Device), an FPGA (Field-Programmable Gate Array), or an ASIC (Application Specific Integrated). It may also be an integrated circuit such as a circuit. In this case, the processor 17a executes various calculations and processes based on a program written in advance.

[Configuration of humidity control section 12]
5 and 6 are piping system diagrams showing the humidity control section 12.
The humidity control unit 12 is provided in the middle of the air supply passage 31 and the exhaust passage 32, and collects moisture from the air flowing through one of the air supply passage 31 and the exhaust passage 32, and collects moisture from the air flowing through the other of the air supply passage 31 and the exhaust passage 32. Supply the flowing air.

The humidity control unit 12 includes a first heat exchanger 51, a second heat exchanger 52, a first adsorbent 53, a second adsorbent 54, a compressor 55, a switching mechanism 56, and a pressure reducing mechanism 57. , and a refrigerant pipe 58. In the humidity control unit 12, when the first heat exchanger 51 functions as a condenser (that is, when heating air in the first heat exchanger 51), the refrigerant discharged from the compressor 55 is transferred to the switching mechanism. 56, each part 51, 52, 55 to 57 is connected by a refrigerant pipe 58 so that the refrigerant flows in the order of the first heat exchanger 51, pressure reduction mechanism 57, second heat exchanger 52, and switching mechanism 56 and returns to the compressor 55. ing.

The first heat exchanger 51 and the second heat exchanger 52 are, for example, cross-fin type fin-and-tube heat exchangers. A first adsorbent 53 is provided on the surface of each fin of the first heat exchanger 51, and a second adsorbent 54 is provided on the surface of each fin of the second heat exchanger 52.

The first adsorbent 53 and the second adsorbent 54 adsorb water vapor in the air. The first adsorbent 53 and the second adsorbent 54 may be, for example, zeolite, silica gel, or activated carbon, or may be an organic polymer material having a hydrophilic functional group.

The compressor 55 is a variable capacity compressor whose rotational frequency is controlled by an inverter based on an operation command from the control unit 17 . The switching mechanism 56 is a mechanism for switching the flow direction of the refrigerant in the refrigerant pipe 58, and is, for example, a four-way switching valve. The switching mechanism 56 is connected to the refrigerant pipe 58 through four ports P1 to P4, respectively. Port P1 is connected to the discharge side of compressor 55, and port P2 is connected to the suction side of compressor 55. Port P3 is connected to the first end of the first heat exchanger 51, and port P4 is connected to the first end of the second heat exchanger 52.

The switching mechanism 56 is switched between a first connection state (the state shown in FIG. 5) and a second connection state (the state shown in FIG. 6) based on a control command from the control unit 17. The first connection state is a state in which ports P1 and P3 are connected, and ports P2 and P4 are connected, and in this state, the refrigerant discharged from the compressor 55 is sent to the first heat exchanger 51. It will be done. The second connection state is a state in which ports P1 and P4 are connected, and ports P2 and P3 are connected, and the refrigerant discharged from the compressor 55 is sent to the second heat exchanger 52.

The pressure reduction mechanism 57 is a mechanism connected to the second end side (opposite side of the first end) of each of the first heat exchanger 51 and the second heat exchanger 52, and is, for example, an expansion valve. The opening degree of the pressure reducing mechanism 57 is controlled based on a control command from the control unit 17, so that the pressure of the refrigerant flowing through the pressure reducing mechanism 57 is reduced.

[Configuration of detection units 61 and 62]
Please refer to FIG. The outside air side detection unit 61 detects the temperature and humidity of the air in the first air supply passage 31a (that is, the side of the air supply passage 31 closer to the outside air intake port 21 than the humidity control unit 12). The outside air side detection unit 61 is provided, for example, near the outside air intake port 21 and detects the temperature (outdoor temperature) of the outside air taken in from the outside air intake port 21 and the humidity (outdoor temperature) of the outside air. The outside air side detection section 61 is electrically connected to the control section 17 and outputs a detection result to the control section 17 .

The outside air side detection section 61 includes a temperature sensor 61a and a humidity sensor 61b. The temperature sensor 61a is, for example, a resistance type sensor (thermistor). The humidity sensor 61b may be, for example, a resistance type sensor or a capacitance type sensor.

See FIG. 2. The return air side detection unit 62 detects the temperature and humidity of the air in the first exhaust passage 32a (that is, the side of the exhaust passage 32 closer to the return air intake port 23 than the humidity control unit 12). The return air side detection unit 62 is provided, for example, near the return air intake port 23 and detects the temperature (indoor temperature) of the return air taken in from the return air intake port 23 and the humidity (indoor temperature) of the return air. The return air side detection unit 62 is electrically connected to the control unit 17 and outputs a detection result to the control unit 17.

[Operation of ventilation device 10]
The ventilation device 10 selectively performs a humidification operation and a dehumidification operation according to control instructions from the control unit 17. The humidification operation is an operation in which humidified outside air is sent to the indoor space SP2 as air supply while exhausting the air in the indoor space SP2. The dehumidifying operation is an operation in which dehumidified outside air is sent to the indoor space SP2 as air supply while exhausting the air in the indoor space SP2.

The control unit 17 switches between a humidifying operation and a dehumidifying operation, for example, based on an input from a remote controller (not shown). For example, when a user instructs a dehumidifying operation using the remote control, the control unit 17 executes the dehumidifying operation. Further, for example, when the user instructs automatic operation using the remote control, the control unit 17 appropriately executes humidification operation and dehumidification operation based on the indoor temperature and indoor humidity detected by the return air side detection unit 62.

[Humidification operation]
In the humidification operation, the control unit 17 alternately repeats a first operation and a second operation, which will be described later, at predetermined time intervals. The time interval is also referred to as "batch time" in humidification operation. The batch time is a variable value determined by a control method described below. Batch time is also referred to as changeover time.

FIG. 5 schematically shows how the first operation is executed, and FIG. 6 schematically shows how the second operation is executed. In FIGS. 5 and 6, water-rich air is shown by hatched arrows, and water-free (dry) air is shown by white arrows.

See FIG. 5. The first operation of the humidification operation is to pass outside air through the first heat exchanger 51 that functions as a condenser, and supply moisture from the outside air from the first adsorbent 53 to generate humidified supply air. This is an operation in which return air is passed through the functioning second heat exchanger 52 and moisture in the return air is adsorbed by the second adsorbent 54 to generate dehumidified exhaust gas. In the first operation, the water content of the first adsorbent 53 decreases and the water content of the second adsorbent 54 increases. After executing the first operation for the batch time, the control unit 17 switches the first operation to the second operation.

Specifically, in the first operation, the control unit 17 puts the switching mechanism 56 in the first connected state and rotates the compressor 55. Thereby, the first heat exchanger 51 functions as a condenser, and the second heat exchanger 52 functions as an evaporator.

In the first operation, the control unit 17 opens the dampers 41 and 43, closes the dampers 42 and 44, and rotates the air supply fan 13. Thereby, the outside air taken into the first air supply passage 31a from the outside air intake port 21 passes through the first heat exchanger 51 and the second air supply passage 31b, and is blown out from the air supply outlet 22. At this time, moisture is released into the outside air from the first adsorbent 53 heated by the first heat exchanger 51, so that the outside air is supplied to the indoor space SP2 as moist supply air.

In the first operation, the control unit 17 opens the dampers 46 and 48, closes the dampers 45 and 47, and rotates the exhaust fan 14. Thereby, the return air taken into the first exhaust passage 32a from the return air intake port 23 passes through the second heat exchanger 52 and the second exhaust passage 32b, and is blown out from the exhaust outlet 24. At this time, moisture in the return air is adsorbed by the second adsorbent 54 cooled by the second heat exchanger 52, so that the return air is discharged to the outdoor space SP1 as dry exhaust gas.

As described above, in the first operation of the humidifying operation, the second adsorbent 54 becomes the moisture absorption region A1 that adsorbs moisture in the return air, and the first adsorbent 53 becomes the moisture release region A2 that releases moisture to the outside air. Further, the first heat exchanger 51 serves as a heating mechanism that heats the moisture release area A2 (first adsorbent 53).

See FIG. 6. In the second operation of the humidification operation, outside air is passed through the second heat exchanger 52 that functions as a condenser, and moisture is supplied from the second adsorbent 54 to the outside air to generate moisture-rich supply air. In this operation, return air is passed through the first heat exchanger 51 which functions as a heat exchanger, and moisture in the return air is adsorbed by the first adsorbent 53 to generate dry exhaust gas.

Specifically, in the second operation, the control unit 17 puts the switching mechanism 56 in the second connected state and rotates the compressor 55. Thereby, the first heat exchanger 51 functions as an evaporator, and the second heat exchanger 52 functions as a condenser.

In the second operation, the control unit 17 rotates the air supply fan 13 with the dampers 41 and 43 in the closed state and the dampers 42 and 44 in the open state. Thereby, the outside air taken into the first air supply passage 31a from the outside air intake port 21 passes through the second heat exchanger 52 and the second air supply passage 31b, and is blown out from the air supply outlet 22. At this time, moisture is released into the outside air from the second adsorbent 54 heated by the second heat exchanger 52, so that the outside air is supplied to the indoor space SP2 as moist supply air.

In the second operation, the control unit 17 causes the exhaust fan 14 to rotate with the dampers 46 and 48 in the closed state and the dampers 45 and 47 in the open state. Thereby, the return air taken into the first exhaust passage 32a from the return air intake port 23 passes through the first heat exchanger 51 and the second exhaust passage 32b, and is blown out from the exhaust outlet 24. At this time, moisture in the return air is adsorbed by the first adsorbent 53 cooled by the first heat exchanger 51, so that the return air is discharged into the outdoor space SP1 as dry exhaust gas.

As described above, in the second operation of the humidifying operation, the first adsorbent 53 becomes the moisture absorption region A1 that adsorbs moisture in the return air, and the second adsorbent 54 becomes the moisture release region A2 that releases moisture to the outside air. Further, the second heat exchanger 52 serves as a heating mechanism that heats the moisture release area A2 (second adsorbent 54).

In the second operation, the water content of the first adsorbent 53 increases and the water content of the second adsorbent 54 decreases. After executing the second operation for the batch time, the control unit 17 switches the second operation to the first operation. As described above, by repeating the first operation and the second operation, the moisture contained in the return air is supplied to the outside air via the first adsorbent 53 and the second adsorbent 54, so that the indoor space SP2 is Continuously humidified.

[Dehumidification operation]
In the dehumidifying operation, the control unit 17 alternately repeats a first operation and a second operation, which will be described later, at predetermined time intervals. The time interval is also referred to as the "batch time" in the dehumidifying operation. The batch time is a variable value determined by a control method described below.

See FIG. 5. The first operation of the dehumidification operation is to pass return air through the first heat exchanger 51 that functions as a condenser, supply moisture to the return air from the first adsorbent 53 to generate humidified exhaust gas, and to generate humidified exhaust gas. This operation generates dehumidified supply air by passing outside air through the second heat exchanger 52, which functions as a heat exchanger, and causing the second adsorbent 54 to adsorb moisture in the outside air. In the first operation, the water content of the first adsorbent 53 decreases and the water content of the second adsorbent 54 increases. After executing the first operation for the batch time, the control unit 17 switches the first operation to the second operation.

Specifically, in the first operation, the control unit 17 puts the switching mechanism 56 in the first connected state and rotates the compressor 55. Thereby, the first heat exchanger 51 functions as a condenser, and the second heat exchanger 52 functions as an evaporator.

In the first operation, the control unit 17 rotates the air supply fan 13 with the dampers 41 and 43 in the closed state and the dampers 42 and 44 in the open state. Thereby, the outside air taken into the first air supply passage 31a from the outside air intake port 21 passes through the second heat exchanger 52 and the second air supply passage 31b, and is blown out from the air supply outlet 22. At this time, the second adsorbent 54 cooled by the second heat exchanger 52 adsorbs moisture in the outside air, so that the outside air is supplied to the indoor space SP2 as dry supply air.

In the first operation, the control unit 17 causes the exhaust fan 14 to rotate with the dampers 46 and 48 in the closed state and the dampers 45 and 47 in the open state. Thereby, the return air taken into the first exhaust passage 32a from the return air intake port 23 passes through the first heat exchanger 51 and the second exhaust passage 32b, and is blown out from the exhaust outlet 24. At this time, moisture is released from the return air from the first adsorbent 53 heated by the first heat exchanger 51, so that the return air is discharged into the outdoor space SP1 as humid exhaust gas.

As described above, in the first operation of the dehumidification operation, the second adsorbent 54 becomes the moisture absorption region A1 that adsorbs moisture from the outside air, and the first adsorbent 53 becomes the moisture release region A2 that releases moisture from the return air. Further, the first heat exchanger 51 serves as a heating mechanism that heats the moisture release area A2 (first adsorbent 53).

See FIG. 6. In the second operation of the dehumidifying operation, return air is passed through the second heat exchanger 52 that functions as a condenser, and moisture is supplied from the return air from the second adsorbent 54 to generate humidified exhaust gas. This operation generates dehumidified supply air by passing outside air through the first heat exchanger 51, which functions as a heat exchanger, and causing the first adsorbent 53 to adsorb moisture in the outside air.

Specifically, in the second operation, the control unit 17 puts the switching mechanism 56 in the second connected state and rotates the compressor 55. Thereby, the first heat exchanger 51 functions as an evaporator, and the second heat exchanger 52 functions as a condenser.

In the second operation, the control unit 17 opens the dampers 41 and 43, closes the dampers 42 and 44, and rotates the air supply fan 13. Thereby, the outside air taken into the first air supply passage 31a from the outside air intake port 21 passes through the first heat exchanger 51 and the second air supply passage 31b, and is blown out from the air supply outlet 22. At this time, the first adsorbent 53 cooled by the first heat exchanger 51 adsorbs moisture in the outside air, so that the outside air is supplied to the indoor space SP2 as dehumidified supply air.

In the second operation, the control unit 17 opens the dampers 46 and 48, closes the dampers 45 and 47, and rotates the exhaust fan 14. Thereby, the return air taken into the first exhaust passage 32a from the return air intake port 23 passes through the second heat exchanger 52 and the second exhaust passage 32b, and is blown out from the exhaust outlet 24. At this time, moisture is released from the second adsorbent 54 heated by the second heat exchanger 52, so that the return air is discharged into the outdoor space SP1 as humid exhaust gas.

As described above, in the second operation of the dehumidifying operation, the first adsorbent 53 becomes the moisture absorption region A1 that adsorbs moisture from the outside air, and the second adsorbent 54 becomes the moisture release region A2 that releases moisture from the return air. Further, the second heat exchanger 52 serves as a heating mechanism that heats the moisture release area A2 (second adsorbent 54).

In the second operation, the water content of the first adsorbent 53 increases and the water content of the second adsorbent 54 decreases. After executing the second operation for the batch time, the control unit 17 switches the second operation to the first operation. As described above, by repeating the first operation and the second operation, the moisture contained in the outside air is supplied to the return air via the first adsorbent 53 and the second adsorbent 54, so that the indoor space SP2 is Continuously dehumidified.

[Control method]
FIG. 7 is a flowchart showing the procedure of the control method according to the embodiment.
In the past, the batch time was a fixed value. On the other hand, the control unit 17 sets the batch time Z1 (switching time Z1) to a variable value depending on the absolute humidity H1 of the air flowing into the moisture absorption area A1.

Specifically, the higher the absolute humidity H1 of the air flowing into the moisture absorption area A1, the shorter the time until the moisture absorption area A1 is saturated (or until it approaches saturation). Set it to a short time. As a result, it is possible to switch between the moisture absorption area A1 and the moisture release area A2 before the moisture absorption area A1 is saturated (or shortly after the moisture absorption area A1 is saturated), so that the humidity control efficiency can be improved. can.

On the other hand, the lower the absolute humidity H1 of the air flowing into the moisture absorption area A1, the longer the time until the moisture absorption area A1 is saturated (or until it approaches saturation), so the control unit 17 sets the batch time Z1 to a longer time. Set to . This makes it possible to suppress frequent switching, thereby suppressing loss associated with switching (for example, power consumption in the switching mechanism 56), and improving humidity control efficiency.

First, the control unit 17 obtains the absolute humidity H1 of the air flowing into the moisture absorption area A1 (step S11). The control unit 17 acquires the absolute humidity H1 based on the detection result of the outside air side detection unit 61 when the moisture absorption area A1 adsorbs moisture in the outside air (that is, in the case of dehumidifying operation). Specifically, the control unit 17 determines the absolute humidity of the outside air based on the temperature detected by the temperature sensor 61a (temperature of outside air), the humidity detected by the humidity sensor 61b (relative humidity of outside air), and a known calculation formula. Calculate H1.

Note that the outside air side detection unit 61 may calculate the absolute humidity H1 of the outside air, and the calculated absolute humidity H1 may be output to the control unit 17 as a detection result. In this case, since the control unit 17 directly acquires the detection result output from the outside air side detection unit 61 as the absolute humidity H1, the processing load on the control unit 17 can be reduced.

The control unit 17 acquires the absolute humidity H1 based on the detection result of the return air side detection unit 62 when the moisture absorption area A1 adsorbs moisture in the return air (that is, in humidification operation). Specifically, the control unit 17 controls the return air based on the temperature detected by the temperature sensor 62a (the temperature of the return air), the humidity detected by the humidity sensor 62b (the relative humidity of the return air), and a known calculation formula. Calculate the absolute humidity H1 of .

Note that the return air side detection unit 62 may calculate the absolute humidity H1 of the return air, and the calculated absolute humidity H1 may be output to the control unit 17 as a detection result. In this case, since the control unit 17 directly acquires the detection result output from the return air side detection unit 62 as the absolute humidity H1, the processing load on the control unit 17 can be reduced.

Next, the control unit 17 obtains the batch time Z1 based on the obtained absolute humidity H1 (step S12). For example, the control unit 17 obtains a shorter batch time Z1 as the absolute humidity H1 is higher.

FIG. 8 is a graph showing an example of the relationship between absolute humidity and batch time. The horizontal axis of FIG. 8 is the absolute humidity [g/kg] of the air flowing into the moisture absorption area A1, and the vertical axis of FIG. 8 is the batch time [min]. For example, the manufacturer of the ventilation system 10 (or a company commissioned by the manufacturer to perform testing) obtains optimal batch times for a plurality of absolute humidities including the rated conditions through preliminary testing.

Specifically, the manufacturer of the ventilation device 10 obtains the optimum batch time (for example, 3.5 minutes) for the rated conditions of humidification operation in the plot PL1 through a test. Here, the rated conditions for humidification operation are, for example, the conditions defined in Japanese Industrial Standards (JIS) B8638:2020 (humidity control outside air processing machine using heat pump desiccant method), and the dry bulb temperature of outside air is 0°C, outside air The relative humidity of the return air was 50%, the dry bulb temperature of the return air was 22° C., and the relative humidity of the return air was 50% (the absolute humidity of the return air was 8.2 g/kg).

For example, a test is conducted by changing the batch time to 3 minutes, 3.5 minutes, 4 minutes, etc., and the time when the humidity control efficiency is highest among the various conditions is determined as the optimum batch time. For example, in the case of humidification operation, the time when the amount of humidification is highest is set as the optimum batch time. If there are multiple conditions for the time when the humidification amount is the highest, the time when the batch time is the longest among them (that is, the time when the frequency of switching is low) is set as the optimal batch time.

Through testing, the manufacturer of the ventilation system 10 obtains the optimum batch time under conditions where the absolute humidity is lower than the plot PL1 as a plot PL1a, and obtains the optimum batch time under conditions where the absolute humidity is higher than the plot PL1 as a plot PL1b. .

Similarly, the manufacturer of the ventilation system 10 has determined through testing that the optimum batch time (for example, 2.0 minutes) for the rated conditions of dehumidification operation has been obtained in plot PL2, and that the absolute humidity is lower than plot PL2. The optimum batch time under conditions where the absolute humidity is higher than plot PL1b is obtained as plot PL2a, and the optimum batch time under conditions where absolute humidity is higher than plot PL2 is obtained as plot PL2b. Here, the rated conditions for dehumidification operation are, for example, the conditions defined in JIS B8638:2020, such as an outside air dry bulb temperature of 33°C and an outside air wet bulb temperature of 28°C (absolute humidity of outside air 22.0 g/kg). , the dry bulb temperature of the return air is 27°C, and the wet bulb temperature of the return air is 19°C.

Based on these plots PL1, PL1a, PL1b, PL2, PL2a, PL2b, the manufacturer of the ventilation device 10 obtains a curve F1 representing the relationship between absolute humidity and optimal batch time. The curve F1 may be a correlation expression expressed by a linear function or a sub-function, or may be a moving average of a plurality of plots. The manufacturer of the ventilation device 10 stores information regarding the curve F1 (for example, a function with absolute humidity as a variable) in the memory 17b.

See FIG. 7. The control unit 17 acquires the batch time Z1 based on the absolute humidity H1 acquired in step S11 and information regarding the curve F1 stored in advance in the memory 17b (step S12). Specifically, as shown in FIG. 8, the control unit 17 obtains the batch time corresponding to the absolute humidity H1 as the batch time Z1 in the curve F1. As a calculation within the control unit 17, for example, a function indicating the curve F1 is read from the memory 17b, and the absolute humidity H1 is substituted into the function to calculate the batch time Z1.

Next, when the batch time Z1 acquired in step S12 is less than the predetermined lower limit Z1c, the control unit 17 sets the batch time Z1 to the lower limit Z1c (steps S13 to S17).

For example, if the batch time Z1 is extremely short (for example, less than 1 minute), switching in the switching mechanism 56 will occur frequently, and the temperatures of the first heat exchanger 51 and the second heat exchanger 52 will become unstable. There is a possibility that the humidity control efficiency in the humidity control section 12 may actually decrease. Moreover, if switching in the switching mechanism 56 occurs frequently, the life of the switching mechanism 56 may be shortened.

Therefore, the controller 17 shortens the batch time Z1 as the absolute humidity H1 is higher, and controls the switching mechanism 56 by uniformly setting the batch time Z1 to the lower limit Z1c when the absolute humidity H1 becomes higher than a certain level. do. Thereby, it is possible to suppress a decrease in humidity control efficiency due to frequent switching of the switching mechanism 56, and to prevent the switching mechanism 56 from having a single lifespan.

Here, the memory 17b previously stores the lower limit batch time Z1 that can maintain the temperature stability of the first heat exchanger 51 and the second heat exchanger 52 as the first value X1. The first value X1 corresponds to the lower limit batch time Z1 that can be switched without reducing the humidity control efficiency in the humidity control section 12.

Furthermore, the memory 17b stores in advance a lower limit batch time Z1 that also takes into account the lifespan (durability) of the switching mechanism 56 as a second value X2. The second value X2 is set, for example, as the minimum batch time Z1 that can maintain an acceptable lifespan (for example, the specification lifespan), based on the relationship between the number of times the switching mechanism 56 is switched and the lifespan. The second value X2 is larger than the first value X1 by an amount that takes into account the life of the switching mechanism 56 (X2>X1).

The control unit 17 can set a plurality of modes regarding the lower limit value Z1c. The plurality of modes may be selected by the user's remote control operation, or may be automatically selected by the control unit 17 depending on various situations. The plurality of modes include a first mode that prioritizes the humidity control efficiency of the humidity control section 12 over the lifespan of the switching mechanism 56, and a second mode that prioritizes the lifespan of the switching mechanism 56 over the humidity control efficiency of the humidity control section 12. ,including. The first mode is a mode in which the lower limit value Z1c is the first value X1. The second mode is a mode in which the lower limit value Z1c is set to the second value X2.

The control unit 17 determines which mode is selected as the mode of the lower limit value Z1c (step S13). If the first mode is selected, the process proceeds to step S14, and if the second mode is selected, the process proceeds to step S16.

In step S14, the control unit 17 determines whether the batch time Z1 acquired in step S12 is less than the first value X1. If the batch time Z1 is less than the first value X1 (YES in step S14), the control unit 17 sets the batch time Z1 to the first value X1 (Z1=X1, step S15). If the batch time Z1 is greater than or equal to the first value X1 (NO in step S14), the control unit 17 skips step S15 and maintains the batch time Z1 acquired in step S12.

In step S16, the control unit 17 determines whether the batch time Z1 acquired in step S12 is less than the second value X2. If the batch time Z1 is less than the second value X2 (YES in step S16), the control unit 17 sets the batch time Z1 to the second value X2 (Z1=X2, step S17). If the batch time Z1 is greater than or equal to the second value X2 (NO in step S16), the control unit 17 skips step S17 and maintains the batch time Z1 acquired in step S12.

As described above, the control unit 17 obtains the batch time Z1 according to the absolute humidity H1. Thereafter, the control unit 17 controls the switching mechanism 56 based on the acquired batch time Z1. Since the batch time Z1 has a value according to the absolute humidity H1, the switching mechanism 56 can be controlled with the batch time Z1 suitable for the moisture absorption state of the moisture absorption area A1. Thereby, the humidity control efficiency in the humidity control section 12 can be improved.

[Modified example]
The present disclosure is not limited to the embodiments described above, and various changes are possible. In the following modified examples, the same components as those in the above embodiment are given the same reference numerals, and the description thereof will be omitted as appropriate.

[Variation example of batch time acquisition]
In step S12, the control unit 17 may obtain a shorter batch time Z1 as the absolute humidity H1 is higher, and the specific content thereof is not limited to the graph shown in FIG. 8. For example, the control unit 17 may obtain the batch time Z1 based on a stepwise curve as shown in FIG. 9 instead of a continuous curve F1 as shown in FIG.

FIG. 9 is a graph showing a different relationship between absolute humidity and batch time than that shown in FIG. 8. The horizontal and vertical axes in FIG. 9 are the same as in FIG. 8. Further, plots PL1, PL1a, PL1b, PL2, PL2a, and PL2b in FIG. 9 are the same as those in FIG. 8. The graph of FIG. 9 differs from FIG. 8 in that each plot PL1, PL1a, PL1b, PL2, PL2a, PL2b has a discontinuous step function F2.

Based on these plots PL1, PL1a, PL1b, PL2, PL2a, PL2b, the manufacturer of the ventilator 10 obtains a step function F2 indicating the relationship between absolute humidity and optimal batch time. The manufacturer of the ventilator 10 stores information regarding the step function F2 in the memory 17b. Specifically, the manufacturer of the ventilation device 10 stores time information in which the absolute humidity H1 and the batch time Z1 are linked in the memory 17b, for example, in a table format.

FIG. 10 is a table showing an example of time information linking absolute humidity H1 and batch time Z1. The table shown in FIG. 10 corresponds to the step function F2 in FIG. For example, the absolute humidity H1 that is less than or equal to the predetermined value Thx is associated with an upper limit Z1x as the batch time Z1. That is, in the examples of FIGS. 9 and 10, the batch time Z1 is not set to a time exceeding the upper limit Z1x.

Further, as shown in FIG. 9, when the absolute humidity H1 exceeds a predetermined value Th2, which is larger than the predetermined value Thx, and is less than or equal to the predetermined value Th1 (first predetermined value Th1), the batch time Z1 is shorter than the upper limit Z1x. A first time Z1a is linked. Furthermore, the absolute humidity H1 that exceeds the predetermined value Th1 and is less than or equal to the predetermined value Th3 is associated with a second time Z1b, which is shorter than the first time Z1a, as the batch time Z1.

The absolute humidity H1 exceeding the predetermined value Th3 is associated with a lower limit value Z1c as the batch time Z1. That is, in the examples of FIGS. 9 and 10, the batch time Z1 is not set to a time less than the lower limit Z1c.

As described above, when the batch time Z1 is shortened in stages as the absolute humidity H1 is higher, the time information can be stored in the memory 17b in a table format, etc. The processing load can be reduced.

[Modified example of humidity control section]
FIG. 11 is a diagram schematically showing a humidity control section 120 according to a modification. The ventilation device 10 of the embodiment humidifies or dehumidifies the indoor space SP2 using the heat pump desiccant type humidity control unit 12. However, the ventilation device 10 may humidify or dehumidify the indoor space SP2 using other methods.

The humidity control section 120 shown in FIG. 11 employs a desiccant rotor system. The humidity control section 120 includes a heating mechanism 510, a cooling mechanism 520, an adsorption member 530, and a switching mechanism 560. The adsorption member 530 is a member in which an adsorbent is supported on the surface of a disc-shaped porous base material. The switching mechanism 560 is a motor that rotates the suction member 530 around the center of the disk of the suction member 530 . The switching mechanism 560 rotates the suction member 530 at a predetermined rotational speed based on a control command from the control unit 17 .

The heating mechanism 510 is, for example, a resistance heater. The heating mechanism 510 is provided close to the first semicircular area (lower semicircle in FIG. 11) of the adsorption member 530, and heats the first semicircular area. The first semicircular area becomes a moisture release area A2 that releases the adsorbed moisture.

Cooling mechanism 520 is, for example, a cooling coil. The cooling mechanism 520 is provided close to a second semicircular area (the upper semicircle in FIG. 11) located on the opposite side of the first semicircular area of the adsorption member 530, and cools the second semicircular area. . The second semicircular area becomes a moisture absorption area A1 that adsorbs moisture.

Dehumidification operation in the humidity control section 120 will be explained. The outside air taken in from the outdoor space SP1 passes through the moisture absorption area A1, has moisture adsorbed by the moisture absorption area A1, and is then supplied to the indoor space SP2 as dehumidified supply air. The return air taken in from the indoor space SP2 passes through the moisture release area A2, is supplied with moisture from the moisture release area A2, and is then discharged to the outdoor space SP1 as humidified exhaust gas.

At this time, the switching mechanism 560 moves the moisture absorption area A1 and the moisture release area A2 by rotating the adsorption member 530. As a result, the moisture absorption area A1 that has absorbed moisture becomes the moisture release area A2 and releases moisture, so that the indoor space SP2 can be continuously dehumidified.

In this modification, the time required for the adsorption member 530 to make one revolution is considered to be the batch time. That is, the batch time is defined as the time required for the moisture absorption area A1 to once move to the moisture release area A2 and return to the moisture absorption area A1 again. In this case, the batch time is the reciprocal of the rotation speed of the switching mechanism 560.

Similarly to the above embodiment, the control unit 17 acquires the absolute humidity H1 of the air flowing into the moisture absorption area A1 during dehumidification operation (or humidification operation), and the higher the acquired absolute humidity H1, the shorter the batch time. The switching mechanism 560 is controlled by Z1. That is, the control unit 17 increases the rotation speed of the switching mechanism 560 and rotates the switching mechanism 560 faster as the absolute humidity H1 is higher.

As a result, it is possible to switch between the moisture absorption area A1 and the moisture release area A2 before the moisture content of the moisture absorption area A1 is saturated (or shortly after the moisture content of the moisture absorption area A1 is saturated). The humidity control efficiency in the section 120 can be improved. Note that in this modification, the control unit 17 may directly acquire the rotation speed of the switching mechanism 560 instead of the batch time Z1 based on the absolute humidity H1. The control unit 17 may variably control the value corresponding to the batch time Z1 according to the absolute humidity H1.

[Graph modification example]
In the example of FIGS. 8 and 9, six plots PL1, PL1a, PL1b, PL2, PL2a, and PL2b are obtained through the test, but the number of plots is not limited. For example, only two plots PL1 and PL2 may be acquired, or six or more plots may be acquired.

[Other variations]
Note that at least some of the embodiments described above may be arbitrarily combined with each other.

[Operations and effects of embodiment]
The effects of the ventilation apparatus according to the embodiment and the modified example will be explained.

(1) The ventilation device 10 of the present disclosure is a ventilation device 10 that supplies outside air from an outdoor space SP1 to an indoor space SP2, and discharges return air from the indoor space SP2 to an outdoor space SP1, and The humidity adjusting section 12, 120 is equipped with a humidity adjusting section 12, 120 that adjusts the humidity of the air, and a control section 17 that controls the humidity adjusting section 12, 120. A moisture absorption area A1 that adsorbs moisture, a moisture release area A2 that releases moisture to the other of the outside air and the return air, and the moisture absorption area A1 is changed to the moisture release area A2, and the moisture release area A2 is changed to the moisture absorption area A1, every switching time Z1. and heating mechanisms 51, 52, 510 that heat the moisture release area A2. This is a ventilation device 10 that shortens the time Z1.

The control unit 17 shortens the switching time Z1 as the absolute humidity H1 is higher, so that the moisture absorption area A1 is dehumidified before the moisture content of the moisture absorption area A1 is saturated (or shortly after the moisture content is saturated). It is possible to switch to area A2. In this way, since the switching mechanisms 56 and 560 can be controlled using the switching time Z1 suitable for the moisture absorption state of the moisture absorption area A1, the humidity control efficiency in the humidity control sections 12 and 120 can be improved.

(2) The controller 17 further includes a casing 11 that accommodates the humidity control units 12 and 120 and is formed with an outside air intake 21 that takes in the outside air and a return air intake 23 that takes in the return air. , when the moisture absorption area A1 adsorbs moisture in the outside air, the absolute humidity H1 is obtained based on the detection result of the outside air side detection unit 61 that detects the temperature and humidity of the air on the outside air intake port 21 side than the moisture absorption area A1. However, when the moisture absorption area A1 adsorbs moisture in the return air, the absolute Obtain the humidity H1.

With this configuration, it is possible to obtain the absolute humidity H1 of the air flowing into the moisture absorption area A1.

(3) The control unit 17 sets the switching time Z1 to the first time Z1a when the absolute humidity H1 is less than or equal to the first predetermined value Th1, and sets the switching time Z1 to the first time Z1a when the absolute humidity H1 exceeds the first predetermined value Th1. is a second time Z1b that is shorter than the first time Z1a.

The higher the absolute humidity H1 is, the shorter the switching time Z1 is in stages, so the processing load on the control unit 17 for obtaining the switching time Z1 can be reduced.

(4) The control unit 17 controls the switching time Z1 to a value equal to or greater than the lower limit value Z1c.

When the switching time Z1 is extremely short, switching in the switching mechanism 56 occurs frequently, and the temperatures of the first heat exchanger 51 and the second heat exchanger 52 become unstable, so that the humidity control efficiency in the humidity control section 12 decreases. On the contrary, it may decrease. Moreover, if switching in the switching mechanism 56 occurs frequently, the life of the switching mechanism 56 may be shortened. Therefore, when the absolute humidity H1 becomes higher than a certain level, the control unit 17 controls the switching mechanism 56 by uniformly setting the switching time Z1 to the lower limit value Z1c. Thereby, it is possible to suppress a decrease in humidity control efficiency due to frequent switching of the switching mechanism 56, and to prevent the switching mechanism 56 from having a single lifespan.

(5) The control unit 17 includes a first mode in which the lower limit value Z1c is a first value X1, and a second mode in which the lower limit value Z1c is a second value X2 larger than the first value X1. Can be set to multiple modes.

By setting the lower limit Z1c according to the mode, the switching mechanism 56 can be controlled more suitably according to the user's wishes. For example, it is possible to suppress a decrease in humidity control efficiency due to frequent switching of the switching mechanism 56, and to suppress the switching mechanism 56 from having a single lifespan.

(6) The control unit 17 includes a memory 17b that stores time information linking the absolute humidity H1 and the switching time Z1, and the control unit 17 determines the switching time based on the absolute humidity H1 and the time information. Get Z1.

Since the switching time Z1 can be obtained based on the time information stored in the memory 17b, the processing load on the control unit 17 for obtaining the switching time Z1 can be reduced.

(7) The humidity control unit 12 is a refrigerant circuit including a first heat exchanger 51 in which a first adsorbent 53 is provided and a second heat exchanger 52 in which a second adsorbent 54 is provided. Yes, the switching mechanism 56 switches the flow of refrigerant in the refrigerant circuit between a first operation and a second operation, and in the first operation, the first heat exchanger 51 becomes a condenser and the second heat exchanger 52 becomes a condenser. The first adsorbent 53 serves as an evaporator, and the first adsorbent 53 serves as the moisture release area A2, and in the second operation, the second heat exchanger 52 serves as a condenser, and the first heat exchanger 51 serves as an evaporator. The adsorbent 54 becomes the moisture release area A2, and the heating mechanisms 51 and 52 are the heat exchangers among the first heat exchanger 51 and the second heat exchanger 52 that function as a condenser.

In this way, the ventilation device 10 of the present disclosure can be applied to a so-called heat pump desiccant type ventilation device.

(8) The switching mechanism 560 is a motor that moves the moisture absorption area A1 and the moisture release area A2 by rotating the adsorption member 530 containing an adsorbent.

In this way, the ventilation device 10 of the present disclosure can be applied to a so-called desiccant rotor type ventilation device.

10: ventilation device, 11: casing, 11a: first partition wall, 11b: second partition wall, 12: humidity control unit, 13: air supply fan, 14: exhaust fan, 16: opening/closing mechanism, 17: control unit, 17a: Processor, 17b: Memory, 21: Outside air intake, 22: Supply air outlet, 23: Return air intake, 24: Exhaust air outlet, 31: Air supply passage, 31a: First air supply passage, 31b: Second air supply passage, 32: Exhaust passage, 32a: First exhaust passage, 32b: Second exhaust passage, 41: Damper, 42: Damper, 43: Damper, 44: Damper, 45: Damper, 46: Damper, 47 : damper, 48: damper, 51: first heat exchanger (heating mechanism), 52: second heat exchanger (heating mechanism), 53: first adsorbent, 54: second adsorbent, 55: compressor, 56: switching mechanism, 57: pressure reduction mechanism, 58: refrigerant piping, 61: outside air side detection section, 61a: temperature sensor, 61b: humidity sensor, 62: return air side detection section, 62a: temperature sensor, 62b: humidity sensor, 120: Humidity control section, 510: Heating mechanism, 520: Cooling mechanism, 530: Adsorption member, 560: Switching mechanism, SP1: Outdoor space, SP2: Indoor space, SP3: Upper space, SP4: Lower space, P1: Port , P2: Port, P3: Port, P4: Port, A1: Moisture absorption area, A2: Moisture release area, H1: Absolute humidity, Z1: Batch time (switching time), PL1: Plot, PL1a: Plot, PL1b: Plot, PL2: plot, PL2a: plot, PL2b: plot, F1: curve, F2: step function, Z1c: lower limit, Z1x: upper limit, Th1: predetermined value (first predetermined value), Th2: predetermined value, Th3: predetermined value, Thx: predetermined value, Z1a: first time, Z1b: second time, X1: first value, X2: second value

Claims (8)

A ventilation device (10) that supplies outside air from an outdoor space (SP1) to an indoor space (SP2) and discharges return air from the indoor space (SP2) to the outdoor space (SP1),
a humidity control unit (12, 120) that adjusts the humidity of the outside air and the return air;
a control section (17) that controls the humidity control section (12, 120);
Equipped with
The humidity control section (12, 120)
a moisture absorption area (A1) that adsorbs moisture in one of the outside air and the return air;
a moisture release area (A2) that releases moisture to the other of the outside air and the return air;
a switching mechanism (56, 560) that switches the moisture absorption area (A1) to the moisture release area (A2) and the moisture release area (A2) to the moisture absorption area (A1) at each switching time (Z1);
a heating mechanism (51, 52, 510) that heats the moisture release area (A2);
including;
The control unit (17) is a ventilation device (10) in which the higher the absolute humidity (H1) of the air flowing into the moisture absorption area (A1), the shorter the switching time (Z1). A casing (11) that houses the humidity control unit (12, 120) and is formed with an outside air intake (21) that takes in the outside air and a return air intake (23) that takes in the return air. Prepare,
The control section (17) includes:
When the moisture absorption area (A1) adsorbs moisture in the outside air, an outside air side detection unit (61) detects the temperature and humidity of the air closer to the outside air intake port (21) than the moisture absorption area (A1). Based on the result, obtain the absolute humidity (H1),
When the moisture absorption area (A1) adsorbs moisture in the return air, a return air side detection unit (62) detects the temperature and humidity of the air closer to the return air intake port (23) than the moisture absorption area (A1). ), obtaining the absolute humidity (H1) based on the detection result of
Ventilation device (10) according to claim 1. The control section (17) includes:
When the absolute humidity (H1) is less than or equal to a first predetermined value (Th1), the switching time (Z1) is set as a first time (Z1a),
When the absolute humidity (H1) exceeds the first predetermined value (Th1), the switching time (Z1) is set to a second time (Z1b) shorter than the first time (Z1a);
A ventilation device (10) according to claim 1 or claim 2. The control unit (17) controls the switching time (Z1) to a value equal to or greater than a lower limit value (Z1c).
Ventilation device (10) according to any one of claims 1 to 3. The control section (17) includes:
a first mode in which the lower limit value (Z1c) is a first value (X1);
a second mode in which the lower limit value (Z1c) is a second value (X2) larger than the first value (X1);
Can be set to multiple modes including
Ventilation device (10) according to claim 4. The control unit (17) includes a memory (17b) in which time information linking the absolute humidity (H1) and the switching time (Z1) is stored,
The control unit (17) obtains the switching time (Z1) based on the absolute humidity (H1) and the time information.
Ventilation device (10) according to any one of claims 1 to 5. The humidity control section (12) includes a first heat exchanger (51) provided with a first adsorbent (53) and a second heat exchanger (52) provided with a second adsorbent (54). ) and a refrigerant circuit including
The switching mechanism (56) switches the flow of refrigerant in the refrigerant circuit between a first operation and a second operation,
In the first operation, the first heat exchanger (51) serves as a condenser, the second heat exchanger (52) serves as an evaporator, and the first adsorbent (53) serves as a moisture release area (A2). become,
In the second operation, the second heat exchanger (52) serves as a condenser, the first heat exchanger (51) serves as an evaporator, and the second adsorbent (54) serves as a moisture release area (A2). become,
The heating mechanism (51, 52) is a heat exchanger that functions as a condenser among the first heat exchanger (51) and the second heat exchanger (52).
Ventilation device (10) according to any one of claims 1 to 6. The switching mechanism (560) is a motor that moves the moisture absorption area (A1) and the moisture release area (A2) by rotating an adsorption member (530) containing an adsorbent.
Ventilation device (10) according to any one of claims 1 to 6.

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