WO2020226091A1

WO2020226091A1 - Air conditioning system

Info

Publication number: WO2020226091A1
Application number: PCT/JP2020/017999
Authority: WO
Inventors: 浩介平井; 徹藤本; 山本　昌由; 義孝松木; 岳人酒井
Original assignee: ダイキン工業株式会社
Priority date: 2019-05-08
Filing date: 2020-04-27
Publication date: 2020-11-12

Abstract

An air conditioning system comprising: a heat exchanger that generates air-conditioned air by heat exchange with a refrigerant; a refrigerant sensor for detecting leakage of the refrigerant in the space to be air conditioned; a ventilation device that supplies and discharges air; and a control unit that controls the operation of the ventilation device. The control unit changes the balance between the air supply and discharge by the ventilation unit, for normal operation when refrigerant leakage is not detected by the refrigerant sensor and for when refrigerant leakage is detected by the refrigerant sensor.

Description

Air conditioning system

This disclosure relates to an air conditioning system. More specifically, the present invention relates to an air conditioning system including an air conditioner and a ventilation device.

In relatively large-scale buildings such as office buildings and hotels, an air conditioner that generates cold air or hot air is usually used in combination with a ventilation device that supplies outside air to the living room and exhausts the living room ( For example, see Patent Document 1).

JP-A-2017-75777

If the refrigerant leaks from the air conditioner into the living room, inconveniences such as oxygen deficiency may occur. Therefore, in the air conditioner described in Patent Document 1 described above, when the refrigerant leakage detection device detects the refrigerant, the air-conditioned space The air-conditioning mechanism discharges the refrigerant to and from the air-conditioned space together with the air in the casing accommodating the air-conditioning mechanism and the heat exchanger.

However, in the prior art including the technique described in Patent Document 1, when the refrigerant leaks, the balance between the supply air and the exhaust of the living room (air-conditioned space) is changed by the ventilation device to suppress the diffusion of the refrigerant and reduce the concentration of the refrigerant. There is no disclosure about what to do.
An object of the present disclosure is to provide an air conditioning system capable of suppressing the diffusion of the refrigerant and reducing the concentration of the refrigerant according to the use of the living room when the refrigerant leaks.

The air conditioning system of the present disclosure is
(1) A refrigerant sensor for detecting the leakage of refrigerant in the air-conditioned space of the air conditioner, a ventilation device for supplying and exhausting air, and a control unit for controlling the operation of the ventilation device are provided.
The control unit changes the balance between the air supply and the exhaust of the ventilation device between the normal operation when the refrigerant sensor does not detect the leakage of the refrigerant and the detection of the leaked refrigerant by the refrigerant sensor.

In the air conditioning system of the present disclosure, the balance between the air supply and the exhaust of the ventilation device is changed between the normal operation when the refrigerant leakage is not detected by the refrigerant sensor and the detection of the leaked refrigerant. Thereby, when the refrigerant leaks, the living room can be changed to, for example, exhaust rich or air supply rich, depending on the use of the living room which is the air conditioning target space. By making the exhaust rich, it is possible to suppress the diffusion of the leaked refrigerant from the living room. On the other hand, by making the air supply rich, it is possible to promote the discharge of the leaked refrigerant from the living room and reduce the refrigerant concentration in the living room.
In the present specification, "exhaust rich" means that the air volume of the exhaust gas by the ventilation device is larger than the air volume of the supply air, and "rich air supply" means that the air volume of the air supply by the ventilation device is larger. It means that it is larger than the air volume of the exhaust. However, when one of the supply air volume and the exhaust air volume is zero, for example, when only the exhaust fan of the ventilation device is operating and the supply air fan is stopped, it is also included in "exhaust rich". Similarly, when only the air supply fan of the ventilation device is operating and the exhaust fan is stopped, it is also included in "air supply rich".

(2) In the air conditioning system of (1), the refrigerant is slightly flammable or flammable.
The ventilation device supplies air with a fan and / or exhausts with a fan.
The air conditioning system
An air conditioner having a heat exchanger that generates harmonized air by exchanging heat with a refrigerant,
An auxiliary fan that is communicably connected to the air conditioner and / or the ventilation device and does not operate when the leaked refrigerant is not detected by the refrigerant sensor but operates when the leaked refrigerant is detected by the refrigerant sensor.

According to this configuration, when the refrigerant sensor detects the leakage of the refrigerant, the auxiliary fan operates to ventilate the living room, which is the air-conditioned space, as well as the ventilation by the ventilation device. This makes it possible to dilute the leaked refrigerant and prevent the refrigerant from reaching a combustible concentration. Further, since the auxiliary fan does not operate in the normal time when the refrigerant does not leak, the energy consumption of the air conditioning system in the normal time is not increased.

(3) In the air conditioning system of (1), the ventilation device has two heat exchangers carrying an adsorbent that adsorbs water contained in air, and the two heat exchangers are alternately evaporated. A refrigerant circuit that functions as a vessel or a condenser, two systems of air supply air passages and two systems of exhaust air passages that communicate the inside and outside of the air-conditioned space via the heat exchangers, and each of the supply air passages. An air supply fan that supplies air outside the air-conditioned space to the air-conditioned space via an air passage, and air in the air-conditioned space is discharged to the outside of the air-conditioned space through each exhaust air passage. It is provided with an exhaust fan, an air supply opening / closing mechanism for opening / closing the two systems of the air supply air passage, and an exhaust opening / closing mechanism for opening and closing the two systems of the exhaust air passage.
When the refrigerant sensor detects the leakage of the refrigerant, the control unit operates one of the air supply fan and the exhaust fan to stop the other fan, and causes the air supply air passage and the exhaust air passage. Of these, the air supply opening / closing mechanism and the exhaust opening / closing mechanism are controlled so that one of the air passages corresponding to the one fan is opened in both systems and the other air passage is closed in both systems.

According to this configuration, when the refrigerant leaks from the air conditioner, one of the air supply fan and the exhaust fan is operated, and one of the air supply air passage and the exhaust air passage is opened in both systems to supply air or air. The exhaust air passage can be expanded and the ventilation volume can be increased.

(4) In the air-conditioning system of the above-mentioned (1), the ventilation device has a first air supply air passage and a first air supply air passage that communicate the heat exchanger and the inside and the outside of the air-conditioned space via the heat exchanger. The exhaust air passage, a second air supply air passage that communicates the inside and the outside of the air-conditioned space without passing through the heat exchanger, the first air supply air passage, and the second air supply air passage. An air supply fan that supplies air outside the air-conditioned space into the air-conditioned space, an exhaust fan that discharges air in the air-conditioned space through the first exhaust air passage to the outside of the air-conditioned space, and the above. The first air supply air passage and the air supply opening / closing mechanism for opening and closing the second air supply air passage are provided.
The control unit controls the air supply opening / closing mechanism so as to open both the first air supply air passage and the second air supply air passage when the refrigerant sensor detects the leakage of the refrigerant.

With the above configuration, when the refrigerant leaks from the air conditioner and the leaked refrigerant is detected by the refrigerant sensor, both the first air supply air passage and the second air supply air passage are opened to provide air supply air. The road can be expanded and ventilation can be increased.

(5) In the air-conditioning system of (1), the first air supply air passage and the first air supply air passage, in which the ventilation device communicates the heat exchanger with the inside and outside of the air-conditioned space via the heat exchanger. The air outside the air-conditioned space is passed through the exhaust air passage, the second exhaust air passage that communicates the inside and the outside of the air-conditioned space without passing through the heat exchanger, and the first air supply air passage. An air supply fan supplied into the air-conditioned space, an exhaust fan for discharging air in the air-conditioned space to the outside of the air-conditioned space through the first exhaust air passage and the second exhaust air passage, and the above. It is provided with an exhaust opening / closing mechanism for opening / closing the first exhaust air passage and the second exhaust air passage.
The control unit controls the exhaust opening / closing mechanism so as to open both the first exhaust air passage and the second exhaust air passage when the refrigerant sensor detects the leakage of the refrigerant.

With the above configuration, when the refrigerant leaks from the air conditioner and the leaked refrigerant is detected by the refrigerant sensor, both the first exhaust air passage and the second exhaust air passage are opened to open the exhaust air passage. Can be expanded and the ventilation volume can be increased.

It is explanatory drawing of the refrigerant piping system and the air system of one Embodiment of the air-conditioning system which concerns on 1st Embodiment of this disclosure. It is a perspective explanatory view which shows the structure of the total heat exchanger in a ventilator. It is explanatory drawing of the refrigerant piping system and the air system of one Embodiment of the air conditioning system which concerns on the 2nd Embodiment of this disclosure. It is a figure which shows an example of the relationship between the floor area of various living rooms, and the required ventilation volume. It is a schematic block diagram of the air-conditioning system which concerns on 3rd Embodiment of this disclosure. It is a top view, the right side view, and the left side view which show the schematic structure of the ventilation system. It is explanatory drawing which shows simply showing the air flow which flows through the air supply air passage of 2 systems, and the air flow which flows through the exhaust air passage of 2 systems. It is a piping system diagram which shows the structure of the refrigerant circuit of a ventilator, (a) shows the flow of the refrigerant in the 1st refrigeration cycle operation, and (b) shows the flow of the refrigerant in the 1st refrigeration cycle operation. It is the schematic for demonstrating the 1st operation of the 1st ventilation operation. It is the schematic for demonstrating the 2nd operation of the 1st ventilation operation. It is the schematic for demonstrating the supply air independent operation which is the 2nd ventilation operation. It is the schematic for demonstrating the exhaust independent operation which is the 2nd ventilation operation. It is a schematic cross-sectional explanatory view of the ventilation apparatus which performs the 1st ventilation operation in the air conditioning system which concerns on 4th Embodiment of this disclosure as seen from the top. It is a schematic cross-sectional explanatory view in line AA of FIG. It is a schematic cross-sectional explanatory view in line BB of FIG. It is a perspective view of the total heat exchanger. It is a schematic cross-sectional explanatory view which looked at the ventilation apparatus which performs the 2nd ventilation operation from the top. FIG. 6 is a schematic cross-sectional explanatory view taken along the line CC of FIG. FIG. 5 is a schematic cross-sectional explanatory view of a ventilation device that performs a second ventilation operation of the air conditioning system according to the fifth embodiment of the present disclosure as viewed from above. It is a schematic cross-sectional explanatory view of the ventilation system which performs the 2nd ventilation operation of the air-conditioning system which concerns on 6th Embodiment of this disclosure as seen from the top. It is a top view, the right side view, and the left side view which show the schematic structure of the ventilation system of the air-conditioning system which concerns on 7th Embodiment of this disclosure. It is explanatory drawing which shows the air flow which flows through the air supply air passage of 3 systems and the air flow which flows through the exhaust air passage of 2 systems simply. It is the schematic for demonstrating the 1st operation of the 1st ventilation operation. It is the schematic for demonstrating the 2nd operation of the 1st ventilation operation. It is the schematic for demonstrating the 1st operation of the 2nd ventilation operation. It is the schematic for demonstrating the 2nd operation of the 2nd ventilation operation. It is the schematic for demonstrating the 1st operation of the 2nd ventilation operation of the ventilation apparatus of the air-conditioning system which concerns on 8th Embodiment of this disclosure. It is the schematic for demonstrating the 2nd operation of the 2nd ventilation operation of the ventilation apparatus. It is the schematic for demonstrating the 1st operation of the 2nd ventilation operation of the ventilation apparatus of the air-conditioning system which concerns on 9th Embodiment of this disclosure. It is the schematic for demonstrating the 2nd operation of the 2nd ventilation operation of the ventilation apparatus.

Hereinafter, the air conditioning system of the present disclosure will be described in detail with reference to the attached drawings. It should be noted that the present disclosure is not limited to these examples, and is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

[First Embodiment]
[Overall configuration of air conditioning system]
FIG. 1 is an explanatory diagram showing a refrigerant piping system and an air system of the air conditioning system S according to the first embodiment of the present disclosure. The air conditioning system S is provided with a distributed air conditioner of a refrigerant piping system, and by performing a vapor compression refrigeration cycle operation, the inside of the living room R, which is the air conditioning target space, is cooled and heated, and the ventilation device described later is used. Ventilate the room R.

The type of living room R to which the air conditioning system S is applied is not particularly limited in the present disclosure, and is a space where cooling and / or heating and ventilation are performed, such as an office, a hotel, a hospital, a factory, a theater, or a store. Or all of the space is included. The air conditioning system S includes a heat source unit 10 installed outside the living room R, an indoor unit 20 which is a plurality of air conditioners installed inside the living room R, and a ventilation device 30. The heat source unit 10 and the indoor unit 20 are connected by a liquid refrigerant connecting pipe 11 and a gas refrigerant connecting pipe 12. Further, the ventilation device 30 and the living room R are connected by an air supply (SA) duct 31 and a return air (RA) duct 32. In the living room R, the indoor unit 20 may be installed on the floor surface, may be arranged near the ceiling, or may be arranged behind the ceiling. In FIG. 1, only two indoor units 20 are drawn for the sake of clarity, but the number of indoor units 20 may be one or three or more.

The heat source unit 10 includes a compressor 13, a four-way switching valve 14, a heat source side heat exchanger 15, a heat source side expansion valve 16, a liquid side closing valve 17, and a gas side closing valve 18.

The compressor 13 is a closed-type compressor driven by a motor for the compressor (not shown), and sucks gas refrigerant from the suction flow path 13a.

The four-way switching valve 14 is a mechanism for switching the direction of the refrigerant flow. During the cooling operation, as shown by the solid line in FIG. 1, the four-way switching valve 14 connects the refrigerant pipe 13b on the discharge side of the compressor 13 and one end of the heat exchanger 15 on the heat source side, and also connects the compressor 13. The suction flow path 13a on the suction side and the gas side closing valve 18 are connected. As a result, the heat source side heat exchanger 15 functions as a condenser of the refrigerant compressed by the compressor 13, and the utilization side heat exchanger described later is an evaporator of the refrigerant condensed in the heat source side heat exchanger 15. Functions as.

Further, during the heating operation, as shown by the broken line in FIG. 1, the four-way switching valve 14 connects the refrigerant pipe 13b on the discharge side of the compressor 13 and the gas side closing valve 18 and connects with the suction flow path 13a. Connect to one end of the heat source side heat exchanger 15. As a result, the utilization side heat exchanger functions as a condenser of the refrigerant compressed by the compressor 13, and the heat source side heat exchanger 15 functions as an evaporator of the refrigerant cooled in the utilization side heat exchanger. To do.

The heat source unit 10 is provided with a heat source side fan 19 for taking in outside air into the heat source unit 10 and discharging the outside air that has been heat exchanged with the refrigerant flowing through the heat source side heat exchanger 15 to the outside.

The indoor unit 20 is connected to the heat source unit 10 via the

refrigerant connecting pipes

11 and 12, respectively. The indoor unit 20 has the same outer shape and internal structure. The indoor unit 20 includes a user-side expansion valve 21, a user-side heat exchanger 22, and a user-side fan 23. The user-side fan 23 sucks the air in the living room R into the indoor unit 20, and supplies the air exchanged with the refrigerant flowing through the user-side heat exchanger 22 to the living room R. The indoor unit 20 in the present embodiment includes a heat exchanger 22 on the user side and a refrigerant sensor 24 that detects refrigerant leaked from a refrigerant pipe or the like. The position of the refrigerant sensor 24 is not particularly limited as long as the leaked refrigerant can be detected. It is desirable to place it in the vicinity of a place where leakage is likely to occur. In addition to being arranged inside the indoor unit 20, the refrigerant sensor 24 may be mounted on a remote controller described later for setting, for example, room temperature or air volume, or may be arranged at an appropriate location such as a wall surface of a living room. It can also be set up.

Further, the indoor unit 20 includes a control unit 25 that receives a detection signal from the refrigerant sensor 24 and controls the operation of the user-side fan 23 and the like in the indoor unit 20. The control unit 25 is communicably connected to the control unit 36 of the ventilation device 30 described later. When the refrigerant sensor 24 detects the leakage of the refrigerant, the information on the leakage of the refrigerant is transmitted to the ventilation device 30.

The ventilation device 30 supplies fresh outside air OA to the living room R and discharges the return air RA from the living room to the outside of the aircraft. The ventilation device 30 includes a total heat exchanger 33, a blower fan 34, an exhaust fan 35, and a control unit 36 that controls the operation of the blower fan 34 and the exhaust fan 35. The total heat exchanger 33 in the present embodiment is an orthogonal total heat exchanger configured so that the outside air OA from the outside and the return air RA from the living room are substantially orthogonal to each other. As shown in FIG. 2, the total heat exchanger 33 has a flat plate-shaped partition plate 33a having heat transfer property and moisture permeability and a substantially triangular cross section, and is an interval plate that maintains the flow path height. It is composed of a laminated body with 33b. The spacing plates 33b are laminated one by one at an angle of 90 degrees so that every other wave-shaped cross section appears in the vertical direction (vertical direction in FIG. 2) on a certain side surface. As a result, an air supply side passage (see the white arrow in FIG. 2) and an exhaust side passage (see the black arrow in FIG. 2) are formed across the moisture-permeable partition plate 33a, and the air-permeable side passage (see the black arrow in FIG. 2) is formed through the partition plate 33a. The exchange of sensible heat and latent heat is being carried out. The ventilation device 30 in the present embodiment is a first-class ventilation device that is supplied with air by a blower fan 34 and exhausted by an exhaust fan 35.

[Operation of air conditioning system]
The air conditioning system S having the above-described configuration performs a cooling operation or a heating operation as follows.
During the cooling operation, as described above, the four-way switching valve 14 is in the state shown by the solid line in FIG. In this state, the high-pressure gas refrigerant discharged from the compressor 13 is sent to the heat source side heat exchanger 15 functioning as a condenser via the four-way switching valve 14, and the outside air supplied by the heat source side fan 19. It is cooled by exchanging heat with. The high-pressure refrigerant cooled and liquefied in the heat source side heat exchanger 15 is sent to each indoor unit 20 via the liquid refrigerant connecting pipe 11. The refrigerant sent to each indoor unit 20 is decompressed by the utilization side expansion valve 21 to become a low-pressure gas-liquid two-phase state refrigerant, and the air and heat in the living room R in the utilization side heat exchanger 22 functioning as an evaporator. It is replaced and evaporated to a low pressure gas refrigerant. The low-pressure gas refrigerant heated in the user-side heat exchanger 22 is sent to the heat source unit 10 via the gas refrigerant connecting pipe 12, and is sucked into the compressor 13 again via the four-way switching valve 14.

On the other hand, during the heating operation, as described above, the four-way switching valve 14 is in the state shown by the broken line in FIG. In this state, the high-pressure gas refrigerant discharged from the compressor 13 is sent to each indoor unit 20 via the four-way switching valve 14 and the gas refrigerant connecting pipe 12. The high-pressure gas refrigerant sent to each indoor unit 20 is sent to the utilization side heat exchanger 22 that functions as a condenser, exchanges heat with the air in the living room R to be cooled, and then the utilization side expansion valve 21. Is sent to the heat source unit 10 via the liquid refrigerant connecting pipe 11. The high-pressure refrigerant sent to the heat source unit 10 is depressurized by the heat source-side expansion valve 16 to become a low-pressure gas-liquid two-phase state refrigerant, and flows into the heat source-side heat exchanger 15 that functions as an evaporator. The low-pressure gas-liquid two-phase refrigerant that has flowed into the heat source-side heat exchanger 15 exchanges heat with the outside air supplied by the heat-source-side fan 19, is heated, and evaporates to become a low-pressure refrigerant. The low-pressure gas refrigerant exiting the heat source side heat exchanger 15 is sucked into the compressor 13 again via the four-way switching valve 14.

During normal operation when the leakage of refrigerant is not detected by the refrigerant sensor 24, the ventilation device 30 ventilates the living room R in addition to the cooling operation or heating operation as described above. The required ventilation volume (m ³ / h) is selected according to the use of the living room R and the floor area of the living room R.
On the other hand, in the present embodiment, when the refrigerant sensor 24 arranged in the indoor unit 20 detects the leaked refrigerant, the control unit 36 of the ventilation device 30 that receives the information on the refrigerant leakage from the indoor unit 20 supplies the ventilation device 30. Change the balance between qi and exhaust. Specifically, the operation of the blower fan 34 and / or the exhaust fan 35 can be controlled to change the balance between air supply and exhaust as illustrated in Table 1 below. The mode of change can be appropriately set according to the use of the living room R.

In pattern 1, general use such as an office is assumed as a living room. In this pattern 1, the air supply air volume by the ventilation device 30 and the exhaust air volume by the ventilation device 30 are the same during normal operation. When the refrigerant sensor 24 arranged in the indoor unit 20 detects the leaked refrigerant, the control unit 36 of the ventilation device 30 that receives the information on the refrigerant leakage determines the balance between the supply air and the exhaust gas. Is changed to exhaust rich, which is larger than the amount of air supplied by the ventilation device 30. By making the office etc. negative pressure (negative pressure) as exhaust rich when the refrigerant leaks, it is possible to prevent the refrigerant leaked in the office from diffusing into other rooms and spaces adjacent to the office. it can.

In pattern 2, it is assumed that the living room is used in a clean room or the like where a predetermined cleanliness is required. In this pattern 2, the air supply air volume by the ventilation device 30 and the exhaust air volume by the ventilation device 30 are the same during normal operation. When the refrigerant sensor provided in the indoor unit 20 detects the leaked refrigerant, the control unit 36 of the ventilator 30 that receives the information on the refrigerant leak determines the balance between the supply air and the exhaust air by the ventilation device 30. The air supply is changed to rich, which is larger than the exhaust air volume by the ventilation device 30. By making the clean room or the like positive pressure (positive pressure) as the air supply is rich when the refrigerant leaks, it is possible to suppress foreign substances such as dust from entering the clean room when dealing with the leaked refrigerant, and as a result, the above-mentioned The cleanliness of the clean room can be quickly restored to its original state after the response is completed.

Pattern 3 is expected to be used as a living room in hospitals and the like. In this pattern 3, the exhaust air volume by the ventilation device 30 is larger than the supply air volume by the ventilation device 30 during normal operation. When the refrigerant sensor 24 provided in the indoor unit 20 detects the leaked refrigerant, the control unit 36 of the ventilator 30 that receives the information on the refrigerant leak determines the balance between the supply air and the exhaust air supplied by the ventilator 30. Is changed to an air supply rich that is larger than the exhaust air volume by the ventilation device 30. By making the hospital positive pressure as the air supply is rich when the refrigerant leaks, the refrigerant leaked in the hospital can be quickly discharged and the concentration of the leaked refrigerant in the hospital room can be reduced. In pattern 3, by changing the normally negative pressure to a positive pressure, the differential pressure can be used to increase the amount of air leaking from the hospital room and increase the air volume for discharging the refrigerant.

In pattern 4, it is assumed that the room will be used as a theater or a large-scale office. This pattern 4 is the opposite of the pattern 3, and is rich in air supply in which the air supply air volume by the ventilation device 30 is larger than the exhaust air volume by the ventilation device 30 during normal operation. When the refrigerant sensor provided in the indoor unit 20 detects the leaked refrigerant, the control unit 36 of the ventilation device 30 that receives the information on the refrigerant leakage ventilates the exhaust air volume by the ventilation device 30 to balance the supply air and the exhaust gas. It is changed to an exhaust rich that is larger than the air supply air volume by the device 30. By making the large-scale office or the like negative pressure as exhaust rich when the refrigerant leaks, it is possible to prevent the refrigerant leaked in the office from diffusing into another room or space. In pattern 4, the exhaust duct from the theater or the like can be omitted by making the theater or a large-scale office or the like rich in air supply during normal operation. In this case, the exhaust from the theater or the like can be exhausted by a fan from the corridor or the toilet adjacent to the theater.

When the balance between the supply air and the exhaust gas during normal operation is rich in exhaust gas as in pattern 3, when the refrigerant sensor 24 detects the leaked refrigerant, the control unit 36 of the ventilation device 30 receives the information on the refrigerant leak. The balance between the supply air and the exhaust gas may be changed to be more exhaust-rich by increasing the exhaust air volume by the ventilator 30 or decreasing the supply air volume (Pattern 5). By doing so, it is possible to make the pressure inside the room R more negative than usual, and it is possible to further suppress the diffusion of the leaked refrigerant to other rooms and spaces. ..

When the balance between air supply and exhaust during normal operation is rich in air supply as in pattern 4, when the refrigerant sensor 24 detects the leaked refrigerant, the control unit 36 of the ventilation device 30 that receives the information on the refrigerant leak determines the balance. The balance between the supply air and the exhaust air may be changed to be richer in the air supply by increasing the air supply air volume by the ventilation device 30 or decreasing the exhaust air volume (Pattern 6). By doing so, it is possible to make the pressure inside the room R more positive, increase the amount of air leaking from the room R, and increase the air volume for discharging the refrigerant. be able to.

<Action and effect of the first embodiment>
From the above, the air conditioning system S of the first embodiment has the following effects.
(1) The air conditioner system S is a control unit that controls the operation of the refrigerant sensor 24 for detecting the leakage of the refrigerant in the air conditioner target space of the air conditioner 20, the ventilation device 30 for supplying and exhausting air, and the ventilation device 30. 36, and the control unit 36 supplies and exhausts the air supply and exhaust of the ventilation device 30 during normal operation when the refrigerant sensor 24 does not detect the leakage of the refrigerant and when the refrigerant sensor 24 detects the leakage of the refrigerant. Change the balance.

In the air conditioning system S of the first embodiment, the balance between the supply air and the exhaust of the ventilation device 30 is changed between the normal operation when the refrigerant sensor 24 does not detect the leakage of the refrigerant and the detection of the leaked refrigerant. Therefore, when the refrigerant leaks, the living room can be changed to, for example, exhaust rich or air supply rich, depending on the use of the living room R which is the air-conditioned space. By making the exhaust rich, it is possible to suppress the diffusion of the leaked refrigerant from the living room R. On the other hand, by making the air supply rich, it is possible to promote the discharge of the leaked refrigerant from the living room R and reduce the refrigerant concentration in the living room R.

(2) In the air conditioning system S of the above (1), the control unit 36 sets the air volume of the air supply by the ventilation device 30 and the air volume of the exhaust by the same amount during normal operation, and when the refrigerant sensor 24 detects the leaked refrigerant, the ventilation device 30 The air volume of the exhaust air can be made larger than the air volume of the supply air. In this case, the air volume of the air supply and exhaust is the same during normal operation. For example, in an office or the like, when the refrigerant leaks, the office or the like is made negative pressure (negative pressure) as exhaust rich, so that the air leaks in the office. It is possible to prevent the refrigerant from diffusing into other rooms or spaces.

(3) In the air conditioning system S of the above (1), the control unit 36 sets the air volume of the supply air by the ventilation device 30 and the air volume of the exhaust air to be the same during normal operation, and when the refrigerant sensor 24 detects the leaked refrigerant, the ventilation device 30 The air volume of the air supply by the air can be made larger than the air volume of the exhaust air. In this case, the air volume of the air supply and exhaust is the same during normal operation. For example, in a clean room, when the refrigerant leaks, the clean room is made positive pressure (positive pressure) as the supply air is rich, so that dust and the like are generated when dealing with the leaked refrigerant. It is possible to prevent foreign matter from entering the clean room, and as a result, the cleanliness of the clean room can be quickly restored to the original state after the above-mentioned measures are completed.

(4) In the air conditioning system S of the above (1), the control unit 36 makes the air volume of the exhaust gas by the ventilation device 30 larger than the air volume of the supply air during normal operation, and the ventilation device 30 when the refrigerant sensor 24 detects the leaked refrigerant. The air volume of the air supply by the air can be made larger than the air volume of the exhaust air. In this case, the exhaust gas is enriched during normal operation. For example, in a hospital, the refrigerant leaked in the hospital can be quickly discharged by making the hospital positive pressure as the air supply is rich when the refrigerant leaks. By changing the pressure from the negative pressure to the positive pressure, the differential pressure can be used to increase the amount of air leaking from the hospital room and increase the air volume for discharging the refrigerant.

(5) In the air conditioning system S of the above (1), the control unit 36 makes the air volume of the supply air by the ventilation device 30 larger than the air volume of the exhaust gas during normal operation, and the ventilation device 30 when the refrigerant sensor 24 detects the leaked refrigerant. The air volume of the exhaust gas can be made larger than the air volume of the supply air. In this case, the air supply is rich during normal operation, for example, in a large-scale office or theater, the refrigerant leaked in the office is released by making the large-scale office or the like negative pressure as exhaust rich when the refrigerant leaks. It can be suppressed from spreading to other rooms or spaces.

[Other Embodiments]
Hereinafter, a plurality of other embodiments will be described. In any of the following embodiments, the balance between air supply and exhaust can be set in the modes 1 to 6 as described in the first embodiment.

[Second Embodiment]
The air conditioning system S of the second embodiment includes an auxiliary fan 40 in addition to the air conditioning system S of the first embodiment. The ventilation device 30, the auxiliary fan 40, and the living room R are connected by an air supply (SA) duct 31. Further, the ventilation device 30 and the living room R are connected by a return air (RA) duct 32.

The ventilation device 30 of the second embodiment is the same as the ventilation device 30 of the first embodiment. The capacity of the ventilation device 30 is set based on the required ventilation volume (m ³ / h) calculated based on the estimated number of people in the room R or the room area. As the ventilation device 30 in the present disclosure, the air supply is performed by a fan and the exhaust is a natural exhaust type 2 ventilation device, or the exhaust air is performed by a fan and the air supply is a natural air supply type 3 ventilation device. Can also be used.

The auxiliary fan 40 is a ventilation fan arranged separately from the ventilation device 30. The auxiliary fan 40 includes a ventilation duct 41 that connects the ventilation device 30 and the living room R and is connected to an air supply duct 31 that supplies the outside air OA heat exchanged by the total heat exchanger 33 to the living room R. .. An electric damper 42 for opening and closing the air duct 41 is provided in the air duct 41. Further, the auxiliary fan 40 includes a control unit 43 that controls the operation of the auxiliary fan 40 and the electric damper 42. The control unit 43 is communicably connected to the control unit 36 of the ventilation device 30. The ventilation duct 41 can be directly connected to the living room R without merging with the air supply duct 31 of the ventilation device 30.

In recent years, from the viewpoint of suppressing global warming, the adoption of R32 refrigerant having a low global warming potential has been progressing in air conditioners that cool and heat indoors by a vapor compression refrigeration cycle. Therefore, the R32 refrigerant is also used as the refrigerant in the air conditioning system S according to the second embodiment. However, this R32 refrigerant has a slight flammability (slight flammability), and it is necessary to take measures against leakage in the unlikely event.

The R32 refrigerant may burn when its concentration in the air becomes flammable. The combustion range, which is the range of the concentration at which combustion occurs, has a lower limit and an upper limit. When the concentration of the leaked R32 refrigerant in the air is lower than the lower limit, the R32 refrigerant does not burn even if there is a fire. In the air conditioning system S according to the second embodiment, when the R32 refrigerant leaks from the indoor unit into the living room R, the auxiliary fan 40 is operated together with the ventilation device 30 to ventilate the living room R, and the concentration of the leaked refrigerant is adjusted. It is diluted so as not to reach the lower limit. As the refrigerant, for example, R717, R290 and a mixture thereof, a mixture of these and R32, and the like can be used in addition to the R32 refrigerant, and the present invention is not particularly limited.

When the refrigerant leaks, it is conceivable to dilute the refrigerant by ventilation to prevent the refrigerant from reaching the combustible concentration. The IEC standard or GL-16 (JRA) stipulates the amount of ventilation required to take safety measures for refrigerant leakage by ventilation.

When the required ventilation volume of the ventilation device 30 is larger than the required ventilation volume as a safety measure for refrigerant leakage, the required ventilation volume can be secured at the time of refrigerant leakage by operating the ventilation device. However, since the required ventilation volume of the ventilation device 30 is determined by the assumed number of people in the room and the size of the room as described above, the required ventilation volume becomes small in a room with a small number of people or a room with a small area, and it is necessary when the refrigerant leaks. It may not be possible to secure a sufficient ventilation volume. On the other hand, it is conceivable to set the ventilation volume of the ventilation device 30 to be larger than the ventilation volume required when the refrigerant leaks. However, if ventilation is performed at the set ventilation volume that is normally applied, the ventilation volume will be larger than the originally required ventilation volume, and as a result, the load of the outside air introduced into the living room will increase, resulting in an increase in energy consumption. It ends up.

The air conditioning system S of the second embodiment assists ventilation at the time of refrigerant leakage without increasing the energy consumption at the normal time.

FIG. 4 is a diagram showing an example of the relationship between the floor area of various living rooms and the required ventilation volume. This example shows the required ventilation of a hotel room, a typical office and a restaurant. The ceiling height of each room is 2.7 m, and the ventilation frequency (times / h) is based on the standards of the Japan Society of Air Conditioning and Sanitary Engineering. For example, in the case of a general office with a floor area of 50 m ² , the required ventilation volume is 50 (m ² ) x 2.7 (m) x 2.7 (times / h) = 364.5 (m ³ / h). ).

In FIG. 4, the dotted line shows 162 m ³ / h, which is the required ventilation volume at the time of refrigerant leakage, which is specified in GL-16 (JRA), and the alternate long and short dash line is specified in IEC, at the time of refrigerant leakage. It shows the required ventilation volume of 130 m ³ / h.
When the refrigerant leaks, if the ventilation volume by the ventilation device 30 is larger than the required ventilation volume as a safety measure for the leaked refrigerant specified by GL-16 (JRA) or IEC, the ventilation device 30 can be operated. It is possible to dilute the leaked refrigerant to prevent the leaked refrigerant from reaching the flammable concentration in the air.

However, when the floor area of the living room is small, the ventilation volume by the ventilation device 30 becomes smaller than the required ventilation volume as a safety measure for the leaked refrigerant specified by GL-16 (JRA) or IEC. For example, in the case of a hotel guest room with a floor area of 30 m ^2, the required ventilation volume (m ³ / h) selected based on the CO ² concentration as the air conditioning system S is 30 (m ² ) × 2.7 (m) ×. 1.2 (times / h) = 97.2 (m ³ / h), which is smaller than the required ventilation volume at the time of refrigerant leakage of 130 m ³ / h specified in the IEC. In FIG. 4, the region below the dotted line or the alternate long and short dash line is defined by GL-16 (JRA) or IEC as the required ventilation volume (m ³ / h) selected as the air conditioning system S based on the CO ² concentration. This is the area where the ventilation volume is less than the required ventilation as a safety measure for the leaking refrigerant.

In the present embodiment, when the ventilation volume by the ventilation device 30 is the ventilation volume that enters the lower region depending on the use and floor area of the living room R, the auxiliary fan 40 is operated when the refrigerant leaks to the ventilation device 30. Ventilation volume is supplemented. This makes it possible to dilute the leaked refrigerant and prevent the concentration of the refrigerant in the air from reaching a combustible concentration. The auxiliary fan 40 includes the required ventilation volume A as a safety measure for the leaked refrigerant specified by GL-16 (JRA) or IEC, and the ventilation volume B required to keep the CO ₂ concentration in the living room below the standard value. It is desirable that an air volume equal to or greater than the difference (AB) can be blown. As a result, it is possible to more effectively suppress the concentration of the leaked refrigerant in the air from reaching the combustible concentration. As for the required ventilation volume as a safety measure for the leaked refrigerant, the IEC states that the air volume of either the supply air or the exhaust gas should clear the standard value.

The auxiliary fan 40 operates based on the operation signal from the control unit 36 of the ventilation device 30 that receives the detection signal of the refrigerant sensor 24 that has detected the leaked refrigerant via the control unit 25 of the indoor unit 20. Prior to the operation of the auxiliary fan 40, the electric damper 42, which normally closes the air duct 41, is opened. The air blown from the auxiliary fan 40 is supplied to the living room R together with the air supply SA from the ventilation device 30. The auxiliary fan 40 does not operate in the normal state when the refrigerant does not leak, and operates only when the refrigerant leaks. Therefore, it does not increase the energy consumption of the air conditioning system during normal times. When detecting the leaked refrigerant, it is desirable to operate the auxiliary fan 40, which is a ventilation fan, at the maximum rotation speed. As a result, the ventilation volume required to dilute the leaked refrigerant to less than the flammable concentration can be effectively secured, and as a result, the leaked refrigerant can be more effectively suppressed from reaching the flammable concentration. .. Further, in the present embodiment, the balance between the supply air and the exhaust becomes "air supply rich", the amount of leaked air is increased by making the room R a positive pressure, the leaked refrigerant is discharged quickly, and the leaked refrigerant in the room The concentration can be reduced.

<Action and effect of the second embodiment>
From the above, the air conditioning system S of the second embodiment has the following effects.
(1) The air conditioning system S of the second embodiment includes an air conditioner 20 having a heat exchanger 22 that generates harmonized air by heat exchange with a slightly flammable or flammable refrigerant, and leakage of the refrigerant in the air-conditioned space. The refrigerant sensor 24 for detecting the above, the ventilation device 30 for supplying air by the fan 34 and / or exhausting by the fan 35, and the air conditioner 20 and / or the ventilation device 30 are communicably connected and leaked by the refrigerant sensor 24. It is provided with an auxiliary fan 40 that does not operate when the refrigerant is not detected and operates when the leaked refrigerant is detected by the refrigerant sensor. Therefore, when the refrigerant sensor 24 detects the leakage of the refrigerant, the auxiliary fan 40 operates, and the ventilation device 30 can ventilate the living room R, which is the air-conditioned space. This makes it possible to dilute the leaked refrigerant and prevent the refrigerant from reaching a combustible concentration. Further, since the auxiliary fan 40 does not operate in the normal state when the refrigerant does not leak, the energy consumption of the air conditioning system S in the normal time does not increase.

(2) In the air conditioning system S of the above (1), the auxiliary fan 40 keeps the ventilation volume A required for diluting the leaked refrigerant to less than the combustible concentration and the CO ₂ concentration of the living room R below the reference value. It is possible to blow an air volume equal to or greater than the difference (AB) from the required ventilation volume B. In this case, by operating the auxiliary fan 40, the ventilation volume required to dilute the leaked refrigerant to less than the flammable concentration can be secured, and as a result, the leaked refrigerant reaches the flammable concentration more effectively. It can be suppressed.

(3) In the air conditioning system S of the above (1) or (2), when the refrigerant sensor 24 detects the leaked refrigerant, the air conditioner 20 or the ventilation device 30 that receives the detection signal of the refrigerant sensor 24 operates the auxiliary fan 40. A start signal may be transmitted. In this case, by operating the auxiliary fan 40 that receives the operation start signal, the ventilation volume required to dilute the leaked refrigerant to less than the flammable concentration can be secured, and as a result, the leaked refrigerant becomes combustible. It can be suppressed more effectively.

(4) In the air conditioning system of (1) to (3) above, the auxiliary fan 40 can be used as a ventilation fan. In this case, by operating the ventilation fan, it is possible to secure the ventilation volume required to dilute the leaked refrigerant to less than the flammable concentration, and as a result, it is more effective for the leaked refrigerant to reach the flammable concentration. Can be suppressed.

(5) In the air conditioning system of (4) above, when the refrigerant sensor 24 detects the leaked refrigerant, it is desirable that the rotation speed of the ventilation fan 40 is set to the maximum rotation speed. In this case, since the ventilation fan 40 operates at the maximum rotation speed, the ventilation volume required to dilute the leaked refrigerant to less than the combustible concentration can be effectively secured, and as a result, the leaked refrigerant is released. Reaching the flammable concentration can be suppressed more effectively.

(6) The auxiliary fan 40 of the second embodiment is communicably connected to the air conditioner 20 and / or the ventilation device 30 of (1) to (5) above, and operates when the leaking refrigerant is not detected by the refrigerant sensor 24. Instead, it operates when the leaked refrigerant is detected by the refrigerant sensor 24. The auxiliary fan 40 operates when the refrigerant sensor 24 detects the leakage of the refrigerant, and can ventilate the living room together with the ventilation by the ventilation device 30. This makes it possible to dilute the leaked refrigerant and prevent the refrigerant from reaching a combustible concentration. In addition, since it does not operate in the normal state where the refrigerant does not leak, it does not increase the energy consumption of the air conditioning system in the normal time.

[Third Embodiment]
FIG. 5 is a schematic configuration diagram of the air conditioning system 110 according to the third embodiment of the present disclosure.
The air conditioning system 110 of the present embodiment includes an air conditioner 111 and a ventilation device 112. The air conditioner 111 includes an outdoor unit 121 and an indoor unit 122. The indoor unit 122 and the ventilation device 112 are installed in the space S3 behind the ceiling of the room (living room) R. However, the indoor unit 122 and the ventilation device 112 may be installed on the wall, the floor, the ceiling, or the like of the room R. The indoor unit 122 and the ventilation device 112 are not limited to the same place in the room R, but may be installed in different places.

[Air conditioner configuration]
The air conditioner 111 adjusts the temperature of the air in the indoor space (air conditioning target space) S1 inside the room R by performing a vapor compression refrigeration cycle with a refrigerant circuit including a compressor, a heat exchanger, an expansion valve, and the like. adjust. The outdoor unit 121 and the indoor unit 122 are connected by a refrigerant pipe 123 constituting a refrigerant circuit. The indoor unit 122 takes in the air in the indoor space S1, exchanges heat between the air and the refrigerant, and blows out the temperature-controlled conditioned air to the indoor space S1 again, thereby making the temperature of the indoor space S1 desired. adjust. The specific configuration of the refrigerant circuit of the air conditioner 111, the operation procedure of the cooling operation and the heating operation, and the like are the same as those described with reference to FIG. 1 in the first embodiment.

The indoor unit 122 includes a controller 124, a remote controller 125, and a refrigerant sensor 126.
The controller 124 (hereinafter, also referred to as “air conditioning controller”) controls the operation of the fan, electric valve, etc. housed in the indoor unit 122. The air conditioning controller 124 is composed of, for example, a microcomputer having a processor such as a CPU and a memory such as RAM and ROM. The air-conditioning controller 124 exerts a predetermined function when the processor executes a program installed in the memory. The air conditioning controller 124 is also communicably connected to the controller (control unit) 136 of the ventilation device 112, which will be described later. The air conditioning controller 124 may be provided in the outdoor unit 121, or may be provided in both the outdoor unit 121 and the indoor unit 122.

The remote controller 125 is used for operation start / stop operations and operation settings such as room temperature and ventilation strength. The remote controller 125 is connected to the air conditioning controller 124 of the indoor unit 122 so as to be able to communicate by wire or wirelessly. The user can operate the air conditioner 111 remotely by using the remote controller 125.

The refrigerant sensor 126 detects the refrigerant leaked from the refrigerant piping of the refrigerant circuit of the air conditioner 111. The detection signal of the refrigerant sensor 126 is input to the air conditioning controller 124. The refrigerant sensor 126 is provided in the housing of the indoor unit 122. However, the refrigerant sensor 126 may be provided outside the housing of the indoor unit 122. The refrigerant sensor 126 may be provided, for example, on the remote controller 125 connected to the indoor unit 122.

[Ventilation device configuration]
The ventilation device 112 ventilates the indoor space S1. The ventilator 112 is operated in conjunction with or independently of the air conditioner 111. The ventilation device 112 is connected to the outdoor space S2 and the indoor space S1 via ducts 145a to 145d. The ventilation device 112 of the present embodiment is configured by a humidity control device that adjusts the humidity at the same time as ventilating the indoor space S1.

FIG. 6 is a plan view, a right side view, and a left side view showing a schematic structure of the ventilation device.
The ventilator 112 includes a casing 158, an opening / closing mechanism 135, a controller (control unit) 136 (see FIG. 5), and a refrigerant circuit 161 (see FIG. 8).

(Construction of casing)
The casing 158 is formed in a rectangular parallelepiped box shape having a rectangular planar shape. Specifically, the casing 158 includes a bottom plate 158e, a top plate 158f, and four side plates (first to fourth side plates) 158a to 158d. A part of the refrigerant circuit 161, the opening / closing mechanism 135, and the like are housed in the space surrounded by the bottom plate 158e, the top plate 158f, and the side plates 158a to 158d. In the following description, the lower side in the plan view of FIG. 6 will be described as the front, the upper side as the rear, the left side as the left, and the right side as the right. Of the four side plates 158a to 158d of the casing 158, the side plate 158a arranged on the front side is the first side plate, the side plate 158b arranged on the rear side is the second side plate, and the side plate 158c arranged on the left side is the third side plate. The side plate 158d arranged on the right side is also referred to as a fourth side plate.

A return air intake 141 and an outside air intake 143 are formed on the second side plate 158b of the casing 158. An exhaust air outlet 142 is formed on the third side plate 158c of the casing 158, and an air supply air outlet 144 is formed on the fourth side plate 158d. The return air intake 141 is used to take in the air (return air) RA from the indoor space S1 into the casing 158. The exhaust outlet 142 is used to discharge the return air RA taken into the casing 158 to the outdoor space S2 as an exhaust EA. The outside air intake 143 is used to take in the air (outside air) OA from the outdoor space S2 into the casing 158. The supply air outlet 144 is used to supply the outside air OA taken into the casing 158 to the indoor space S1 as the supply air SA.

As shown in FIG. 5, the outside air intake port 143 and the exhaust air outlet 142 are connected to the outdoor space S2 via

ducts

145a and 145b, respectively. The return air intake 141 and the air supply outlet 144 are connected to the indoor space S1 via

ducts

145c and 145d.

As shown in FIG. 6, the inside of the casing 158 includes a first humidity control chamber 162, a second humidity control chamber 163, a return air side passage 164, an outside air side passage 165, an air supply side passage 166, an exhaust side passage 167, and a supply side passage. It is divided into an air fan chamber 168 and an exhaust fan chamber 169.
Between the first side plate 158a and the second side plate 158b in the casing 158, the first partition wall 170a and the second partition wall 170b are arranged side by side in parallel with these side plates. The space between the second side plate 158b and the first partition wall 170a is vertically partitioned by the third partition wall 170c, the return air side passage 164 is formed on the upper side, and the outside air side passage 165 is formed on the lower side. ing.

A first humidity control chamber 162 and a second humidity control chamber 163 are provided between the first partition wall 170a and the second partition wall 170b. The first humidity control chamber 162 and the second humidity control chamber 163 are partitioned to the left and right by the fourth partition wall 170d. A first heat exchanger 186, which will be described later, is arranged in the first humidity control chamber 162. A second heat exchanger 189, which will be described later, is arranged in the second humidity control chamber 163.

A fifth partition wall 170e is provided on the front side of the second partition wall 170b. The space between the second partition wall 170b and the fifth partition wall 170e is vertically partitioned by the sixth partition wall 170f, the air supply side passage 166 is formed on the upper side, and the exhaust side passage 167 is formed on the lower side. Has been done.
An air supply fan chamber 168 and an exhaust fan chamber 169 are provided on the front side of the air supply side passage 166 and the exhaust side passage 167. The air supply fan chamber 168 and the exhaust fan chamber 169 are partitioned to the left and right by the seventh partition wall 170 g.

The air supply fan chamber 168 communicates with the air supply side passage 166, and the exhaust fan chamber 169 communicates with the exhaust side passage 167. An air supply fan 134 is arranged in the air supply fan room 168. An exhaust fan 133 is arranged in the exhaust fan chamber 169. An air supply outlet 144 is formed on the fourth side plate 158d forming the air supply fan chamber 168, and an exhaust outlet 142 is formed on the third side plate 158c forming the exhaust fan chamber 169.

The casing 158 has an "air supply air passage" and an "exhaust air passage".
The air supply air passage reaches the air supply outlet 144 from the outside air intake port 143 through the outside air side passage 165, the first or second

humidity control chamber

162, 163, the air supply side passage 166, and the air supply fan chamber 168. Is the air flow path to. There are two systems of air supply air passages, one passing through the first humidity control chamber 162 and the other passing through the second humidity control chamber 163. When the air supply fan 134 is activated, an air flow is generated in each air supply air passage.

The exhaust air passage reaches the exhaust outlet 142 from the return air intake 141 through the return air passage 164, the first or second

humidity control chamber

162, 163, the exhaust side passage 167, and the exhaust fan chamber 169. Air flow path. There are two systems of exhaust air passages, one passing through the first humidity control chamber 162 and the other passing through the second humidity control chamber 163. When the exhaust fan 133 is activated, an air flow is generated in each exhaust air passage.

The air supply air passage is formed by an opening / closing mechanism 183 for air supply, which will be described later. The two air supply air passages are alternately switched and opened and closed by the air supply opening and closing mechanism 183, or are opened and closed at the same time.
The exhaust air passage is formed by an opening / closing mechanism 184 for exhaust, which will be described later. The two exhaust air passages are alternately switched and opened and closed by the exhaust opening and closing mechanism 184, or are opened and closed at the same time.

Note that "opening and closing the two air passages by switching alternately" means that when one air passage opens, the other air passage closes alternately. "Simultaneous opening and closing" of two systems means that one air passage and the other air passage open or close at the same time. In order to realize these operations, the air supply opening / closing mechanism 183 and the exhaust opening / closing mechanism 184 are controlled by the controller (control unit) 136.

(Structure of opening / closing mechanism)
Hereinafter, the opening / closing mechanism 135 will be described in detail.
The opening / closing mechanism 135 includes an air supply opening / closing mechanism 183 and an exhaust opening / closing mechanism 184. The opening / closing mechanism 135 has a plurality of dampers 171 to 178 provided on the first partition wall 170a and the second partition wall 170b of the casing 158.

Four openable dampers 171 to 174 are provided on the first partition wall 170a. Each damper 171 to 174 is formed in the shape of a horizontally long rectangular plate.
On the upper side of the first section wall 170a facing the return air side passage 164, the first return air damper 171 is provided on the right side of the fourth section wall 170d, and the second is on the left side of the fourth section wall 170d. A return air damper 172 is provided.

When the first return air damper 171 is opened, the return air side passage 164 and the first humidity control chamber 162 are communicated with each other. When the first return air damper 171 is closed, the return air side passage 164 and the first humidity control chamber 162 are shut off.
When the second return air damper 172 is opened, the return air side passage 164 and the second humidity control chamber 163 are communicated with each other. When the second return air damper 172 is closed, the return air side passage 164 and the second humidity control chamber 163 are shut off.

On the lower side of the first section wall 170a facing the outside air side passage 165, the first outside air damper 173 is provided on the right side of the fourth section wall 170d, and the second outside air damper is provided on the left side of the fourth section wall 170d. 174 is provided.
When the first outside air damper 173 is opened, the outside air side passage 165 and the first humidity control chamber 162 are communicated with each other. When the first outside air damper 173 is closed, the outside air side passage 165 and the first humidity control chamber 162 are shut off.
When the second outside air damper 174 is opened, the outside air side passage 165 and the second humidity control chamber 163 are communicated with each other. When the second outside air damper 174 is closed, the outside air side passage 165 and the second humidity control chamber 163 are shut off.

The second partition wall 170b is provided with four retractable dampers 175 to 178. Each damper 175 to 178 is formed in the shape of a horizontally long rectangular plate.
On the upper side of the second partition wall 170b facing the air supply side passage 166, the first air supply damper 175 is provided on the right side of the fourth partition wall 170d, and the second is on the left side of the fourth partition wall 170d. An air supply damper 176 is provided.

When the first air supply damper 175 is opened, the air supply side passage 166 and the first humidity control chamber 162 are communicated with each other. When the first air supply damper 175 is closed, the air supply side passage 166 and the first humidity control chamber 162 are shut off.
When the second air supply damper 176 is opened, the air supply side passage 166 and the second humidity control chamber 163 are communicated with each other. When the second air supply damper 176 is closed, the air supply side passage 166 and the second humidity control chamber 163 are shut off.

On the lower side of the second partition wall 170b facing the exhaust side passage 167, the first exhaust damper 177 is attached to the right side of the fourth partition wall 170d, and the second exhaust damper 177 is attached to the left side of the fourth partition wall 170d. 178 is attached.
When the first exhaust damper 177 is opened, the exhaust side passage 167 and the first humidity control chamber 162 are communicated with each other. When the first exhaust damper 177 is closed, the exhaust side passage 167 and the first humidity control chamber 162 are shut off.
When the second exhaust damper 178 is opened, the exhaust side passage 167 and the second humidity control chamber 163 are communicated with each other. When the second exhaust damper 178 is closed, the exhaust side passage 167 and the second humidity control chamber 163 are shut off.

FIG. 7 is an explanatory diagram briefly showing the air flow flowing through the two supply air passages and the air flow flowing through the two exhaust air passages.
The first and second

outside air dampers

173 and 174, and the first and second

air supply dampers

175 and 176 constitute an air supply opening / closing mechanism 183. The first and second

return air dampers

171 and 172, and the first and

second exhaust dampers

177 and 178 constitute an exhaust opening / closing mechanism 184.

The two air supply air passages are opened by the operation of the next damper.
First system air supply air passage: Opening operation of the first outside air damper 173 and first air supply damper 175 Second system air supply air passage: Opening operation of the second outside air damper 174 and the second air supply damper 176 FIG. , The air flow flowing through the air supply air passage of the first system is indicated by the reference numeral Fa1, and the air flow flowing through the air supply air passage of the second system is indicated by Fa2.

The two exhaust air passages are opened by the operation of the following dampers, respectively.
Exhaust air passage of the first system: Opening operation of the first return air damper 171 and the first exhaust damper 177 Exhaust air passage of the second system: Opening operation of the second return air damper 172 and the second exhaust damper 178 , The air flow flowing through the exhaust air passage of the first system is indicated by reference numeral Fb1, and the air flow flowing through the exhaust air passage of the second system is indicated by Fb2.

(Composition of refrigerant circuit)
FIG. 8 is a piping system diagram showing a refrigerant circuit of the ventilation device.
The refrigerant circuit 161 is formed by connecting a first heat exchanger 186, a four-way switching valve 187 (switching mechanism), a compressor 188, a second heat exchanger 189, and an electric expansion valve 190 (expansion mechanism) by a refrigerant pipe 191. Is. The refrigerant circuit 161 is configured to execute a vapor compression refrigeration cycle by circulating the refrigerant. The compressor 188, the four-way switching valve 187, and the like are arranged in the air supply fan chamber 168.

The discharge side of the compressor 188 is connected to the first port of the four-way switching valve 187, and the suction side thereof is connected to the second port of the four-way switching valve 187. One end of the first heat exchanger 186 is connected to the third port of the four-way switching valve 187. The other end of the first heat exchanger 186 is connected to the electric expansion valve 190. One end of the second heat exchanger 189 is connected to the fourth port of the four-way switching valve 187. The other end of the second heat exchanger 189 is connected to the electric expansion valve 190. As shown in FIG. 6, the first heat exchanger 186 is arranged in the first humidity control chamber 162, and the second heat exchanger 189 is arranged in the second humidity control chamber 163.

The compressor 188 is a so-called fully enclosed compressor, and is a variable capacity compressor whose rotation speed is controlled by an inverter.
Both the first heat exchanger 186 and the second heat exchanger 189 are composed of a so-called cross-fin type fin-and-tube heat exchanger provided with a heat transfer tube and a large number of fins. Adsorbents such as zeolite are supported on the outer surfaces of the first heat exchanger 186 and the second heat exchanger 189 over almost the entire surface thereof. The first heat exchanger 186 and the second heat exchanger 189 may be microchannel type heat exchangers.

The four-way switching valve 187 has a state in which the first port and the third port communicate with each other and the second port and the fourth port communicate with each other (see FIG. 8A), and the first port and the first port. It is configured to be switchable to a state in which the port 4 communicates and the second port and the third port communicate (see FIG. 8B). The refrigerant circuit 161 reverses the refrigerant circulation direction by switching the communication state of the port of the four-way switching valve 187. Due to the reversal of the refrigerant circulation direction, the first heat exchanger 186 functions as a condenser, the second heat exchanger 189 functions as an evaporator, and the first refrigeration cycle operation and the first heat exchanger 186 act as an evaporator. A second refrigeration cycle operation is performed in which the second heat exchanger 189 functions as a condenser.

(Controller configuration)
As shown in FIG. 5, the controller (control unit) 136 (hereinafter, also referred to as a ventilation controller) of the ventilation device 112 includes an exhaust fan 133, an air supply fan 134, a refrigerant circuit 161 (compressor 188, a four-way switching valve 187, and the like. It controls the operation of the expansion valve 190 and the like; see FIG. 8) and the opening / closing mechanism 135. The ventilation controller 136 includes a processor such as a CPU, a microcomputer provided with a memory such as RAM and ROM, and the like. The ventilation controller 136 exerts a predetermined function by executing a program installed in the memory by the processor. The ventilation controller 136 is communicably connected to the air conditioning controller 124 of the air conditioner 111.

(Details of ventilation operation)
By controlling the operation of the exhaust fan 133, the air supply fan 134, the refrigerant circuit 161 and the opening / closing mechanism 135, the ventilation controller 136 performs the first ventilation operation for ventilation of the normal indoor space S1 and the refrigerant leakage. It is executed by switching between the corresponding second ventilation operation.

<1st ventilation operation>
The first ventilation operation includes a dehumidification ventilation operation in which ventilation is performed while dehumidifying the room and a humidification ventilation operation in which ventilation is performed while humidifying the room.
In the first ventilation operation, the air supply fan 134 and the exhaust fan 133 are driven. As a result, the outside air OA from the outdoor space S2 passes through the outside air intake 143 and is taken into the casing 158, and the return air RA from the indoor space S1 passes through the return air intake 141 and is taken into the casing 158. Be done.

The first and

second heat exchangers

186 and 189 are alternately switched between a condenser and an evaporator. In the first ventilation operation, the outside air OA taken into the casing 158 is one of the first heat exchanger 186 of the first humidity control chamber 162 and the second heat exchanger 189 of the second humidity control chamber 163. The return air RA, which is supplied into the room through the above and is taken into the casing 158, passes through the other heat exchanger of the first heat exchanger 186 and the second heat exchanger 189 and is discharged to the outside of the room. The air flow in the casing 158 is switched. Specifically, the next first operation and the second operation are alternately repeated for 3 minutes each.

(First operation of the first ventilation operation)
In the first operation of the first ventilation operation, the air supply air passage and the exhaust air passage in the casing 158 are set as shown in FIG. Specifically, the second return air damper 172, the first outside air damper 173, the first supply air damper 175, and the second exhaust damper 178 are opened, and the first return air damper 171 and the second outside air damper 174 and the second The air supply damper 176 and the first exhaust damper 177 are closed. In FIG. 9, the damper in the closed state is hatched.

As a result, the air supply air passage of the first system and the exhaust air passage of the second system are formed in the casing 158, and the outside air OA taken into the casing 158 passes through the first heat exchanger 186 and enters the room. The return air RA supplied and taken into the casing 158 passes through the second heat exchanger 189 and is discharged to the outside of the room.

During this first operation, in the case of the dehumidifying / ventilation operation, the second refrigeration cycle operation is performed in the refrigerant circuit 161 as shown in FIG. 8 (b). In the case of humidification ventilation operation, as shown in FIG. 8A, the first refrigeration cycle operation is performed.

The outside air OA that has passed through the outside air intake 143 and is taken into the outside air side passage 165 passes through the first outside air damper 173 and flows into the first humidity control chamber 162, and exchanges the first heat in the first humidity control chamber 162. Humidification (dehumidification or humidification) is performed through the vessel 186. Specifically, in the dehumidifying ventilation operation, the outside air OA passes through the first heat exchanger 186 which is an evaporator to dehumidify and cool, and in the humidifying ventilation operation, the outside air OA is a condenser. It is humidified and heated through the heat exchanger 186. The air conditioned in the first heat exchanger 186 passes through the first air supply damper 175, the air supply side passage 166, the air supply fan chamber 168, and the air supply outlet 144 in this order, and is supplied to the indoor space S1. To.

The return air RA that has passed through the return air intake 141 and is taken into the return air side passage 164 passes through the second return air damper 172 and flows into the second humidity control chamber 163, and in the second humidity control chamber 163. Humidification (humidification or dehumidification) is performed through the second heat exchanger 189. Specifically, in the dehumidifying ventilation operation, the return air RA passes through the second heat exchanger 189, which is a condenser, to be humidified and heated, and in the humidification ventilation operation, the return air RA is an evaporator. It is dehumidified and cooled through the second heat exchanger 189. The air regulated by the second heat exchanger 189 passes through the second exhaust damper 178, the exhaust side passage 167, the exhaust fan chamber 169, and the exhaust outlet 142 in this order, and is discharged to the outside of the room.

(Second operation of the first ventilation operation)
In the second operation of the first ventilation operation, the air supply air passage and the exhaust air passage in the casing 158 are set as shown in FIG. Specifically, the first return air damper 171, the second outside air damper 174, the second supply air damper 176, and the first exhaust damper 177 are in the open state, the second return air damper 172, the first outside air damper 173, and the first. The air supply damper 175 and the second exhaust damper 178 are closed. As a result, the air supply air passage of the second system and the exhaust air passage of the first system are formed in the casing 158, and the outside air OA taken into the casing 158 passes through the second heat exchanger 189 and enters the room. The return air RA supplied and taken into the casing 158 passes through the first heat exchanger 186 and is discharged to the outside of the room.

During this second operation, in the case of the dehumidifying / ventilation operation, the first refrigeration cycle operation is performed in the refrigerant circuit 161 as shown in FIG. 8 (a). In the case of the humidification ventilation operation, the second refrigeration cycle operation is performed as shown in FIG. 8 (b).

The outside air OA that has passed through the outside air intake 143 and is taken into the outside air side passage 165 passes through the second outside air damper 174 and flows into the second humidity control chamber 163, and exchanges the second heat in the second humidity control chamber 163. Humidification (dehumidification or humidification) is performed through the vessel 189. Specifically, in the dehumidifying ventilation operation, the outside air OA passes through the second heat exchanger 189, which is an evaporator, to be dehumidified and cooled, and in the humidifying ventilation operation, the outside air OA is a condenser. It is humidified and heated through the heat exchanger 189. The air conditioned in the second heat exchanger 189 passes through the second air supply damper 176, the air supply side passage 166, the air supply fan chamber 168, and the air supply outlet 144 in this order, and is supplied to the indoor space S1. To.

The return air RA that has passed through the return air intake 141 and is taken into the return air side passage 164 passes through the first return air damper 171 and flows into the first humidity control chamber 162, and in the first humidity control chamber 162. Humidification (humidification or dehumidification) is performed through the first heat exchanger 186. Specifically, in the dehumidifying ventilation operation, the return air RA passes through the first heat exchanger 186, which is a condenser, to be humidified and heated, and in the humidification ventilation operation, the return air RA is an evaporator. It is dehumidified and cooled through the first heat exchanger 186. The air conditioned in the first heat exchanger 186 passes through the first exhaust damper 177, the exhaust side passage 167, the exhaust fan chamber 169, and the exhaust outlet 142 in this order, and is discharged to the outside of the room.

<Second ventilation operation>
The second ventilation operation corresponding to the refrigerant leakage is an operation performed when the refrigerant in the air conditioner 111 leaks and the refrigerant sensor 126 detects the leaked refrigerant. As shown in FIG. 5, when the refrigerant sensor 126 provided in the indoor unit 122 detects the leaked refrigerant, the detection signal is input to the air conditioning controller 124. The air conditioning controller 124 transmits information indicating that a refrigerant leak has occurred (refrigerant leak information) to the ventilation controller 136, and the ventilation controller 136 sends the exhaust fan 133, the air supply fan 134, and the air supply fan 134 based on the refrigerant leak information. Controls the operation of the opening / closing mechanism 135.

FIG. 11 is a schematic view for explaining the supply air independent operation which is the second ventilation operation. FIG. 12 is a schematic view for explaining the exhaust independent operation which is the second ventilation operation.
The second ventilation operation includes "supply air independent operation" and "exhaust independent operation". The “air supply independent operation” is an operation in which the outside air OA from the outdoor space S2 is taken into the casing 158 and only supplied to the indoor space S1 as the air supply SA. The "exhaust independent operation" is an operation in which the return air RA from the indoor space S1 is taken into the casing 158 and only discharged to the outdoor space S2 as the exhaust EA.

In the air supply independent operation, both of the two air supply air passages are opened by the air supply opening / closing mechanism 183, and both of the two exhaust air passages are closed by the exhaust opening / closing mechanism 184. Specifically, the first and second

outside air dampers

173, 174, the first and second

air supply dampers

175, 176 are opened, and the first and second

return air dampers

171 and 172, and the first and second exhaust dampers 177 are opened. , 178 closes. In the air supply independent operation, the air supply fan 134 is driven and the exhaust fan 133 is stopped. When both of the two air supply air passages are opened in this way, the air supply air passage is expanded, and the ventilation volume can be increased as compared with the first ventilation operation.

In the exhaust independent operation, both of the two exhaust air passages are opened by the exhaust opening / closing mechanism 184, and both of the two air supply air passages are closed by the air supply opening / closing mechanism 183. Specifically, the first and second

return air dampers

171 and 172, the first and

second exhaust dampers

177 and 178 are opened, and the first and second

outside air dampers

173 and 174, and the first and second air supply dampers 175 are opened. , 176 closes.
In the exhaust independent operation, the exhaust fan 133 is driven and the air supply fan 134 is stopped. When both of the two exhaust air passages are opened in this way, the exhaust air passage is expanded, and the ventilation volume can be increased as compared with the first operation.

By performing the above-mentioned supply air independent operation or exhaust independent operation, it is possible to discharge the refrigerant from the indoor space S1 in a short time. In addition, in the air supply independent operation, the balance between the supply air and the exhaust becomes "air supply rich", and the amount of leaked air is increased by making the room R positive pressure, and the leaked refrigerant is discharged quickly to leak the refrigerant in the room. The concentration of can be reduced. In the exhaust independent operation, the balance between the supply air and the exhaust becomes "exhaust rich", and by making the room R a negative pressure, it is possible to suppress the leakage refrigerant from diffusing into another room or space.

The ventilation controller 136 has an air supply opening / closing mechanism 183 and an exhaust opening / closing mechanism so as to alternately switch between the supply air independent operation and the exhaust independent operation as described above at predetermined time intervals (for example, every 3 minutes). It controls 184, the air supply fan 134, and the exhaust fan 133. As a result, ventilation by the air supply SA and ventilation by the exhaust EA can be efficiently performed. Further, the ventilation controller 136 stops the operation of the compressor 188 of the refrigerant circuit 161 during the air supply operation and the exhaust operation, and performs only ventilation without performing heat exchange and humidity control between the air and the refrigerant. ..

<Action and effect of the third embodiment>
(1) The air conditioning system 110 according to the third embodiment includes an air conditioner 111 that generates harmonized air by exchanging heat with a refrigerant and supplies it to the indoor space (air conditioning target space) S1, and a refrigerant sensor 126 that detects leakage of the refrigerant. A ventilation device 112 that ventilates the indoor space S1 and a ventilation controller 136 that controls the ventilation device 112 are provided. The ventilator 112 has two first and second heat exchangers 186,189 carrying an adsorbent that adsorbs the moisture contained in the air, and alternately evaporates the two heat exchangers 186,189. A refrigerant circuit 161 that functions as a condenser, two air supply air passages and two exhaust air passages that communicate the indoor space S1 and the outdoor space S2 via

heat exchangers

186 and 189, and each air supply air. Two systems of supply: an air supply fan 134 that supplies the air of the outdoor space S2 to the indoor space S1 via a road, and an exhaust fan 133 that discharges the air of the indoor space S1 to the outdoor space S2 via each exhaust air passage. It includes an air supply opening / closing mechanism 183 that opens / closes the air passage, and an exhaust opening / closing mechanism 184 that opens and closes the two exhaust air passages. When the refrigerant sensor 126 detects the leakage of the refrigerant, the ventilation controller 136 operates one of the supply air fan 134 and the exhaust fan 133 to stop the other fan, and of the supply air passage and the exhaust air passage. The air supply opening / closing mechanism 183 and the exhaust opening / closing mechanism 184 are controlled so as to open both of the two air passages corresponding to one fan and close both of the other air passages.

With the above configuration, when the refrigerant leaks from the air conditioner 111, one of the air supply fan 134 and the exhaust fan 133 is operated, and one of the supply air passage and the exhaust air passage is opened to open both the supply air or the exhaust air passage. The exhaust air passage can be expanded and the ventilation volume can be increased. Therefore, the refrigerant can be discharged to the outdoor space S2 in a short time, and the refrigerant concentration in the indoor space S1 can be reduced.

(2) In the third embodiment, only one of the air supply fan 134 and the exhaust fan 133 is driven. The compressor 188 in the refrigerant circuit 161 is also stopped. Therefore, the power consumption of the ventilation device 112 can be reduced.

(3) In the third embodiment, when the refrigerant sensor 126 detects the leakage of the refrigerant, the ventilation controller 136 alternately operates the air supply fan 134 and the exhaust fan 133 to alternate the air supply air passage and the exhaust air passage. Opens and closes. Therefore, the air supply air passage and the exhaust air passage can be opened and closed alternately to efficiently ventilate the indoor space S1.

[Fourth Embodiment]
FIG. 13 is a schematic cross-sectional explanatory view of a ventilation device that performs the first ventilation operation in the air conditioning system according to the fourth embodiment of the present release, as viewed from above. FIG. 14 is a schematic cross-sectional explanatory view taken along the line AA of FIG. FIG. 15 is a schematic cross-sectional explanatory view taken along the line BB of FIG. In this specification, the "first ventilation operation" is a normal ventilation operation of the indoor space S1 without refrigerant leakage, and the "second ventilation operation" is a refrigerant leakage. It is a ventilation operation corresponding to.

The basic configuration of the air conditioner 111 and the ventilation device 112 in the air conditioning system of this embodiment is the same as that of the third embodiment described with reference to FIG. However, in the present embodiment, the specific configuration of the ventilation device 112 is different from that of the third embodiment.

The ventilation device 112 of the present embodiment has a casing 131 having a substantially rectangular parallelepiped box shape. A total heat exchanger 132, an exhaust fan 133, an air supply fan 134, an opening / closing mechanism 135, and a controller (control unit) 136 are housed in the casing 131. The casing 131 is provided with a return air intake 141, an exhaust air outlet 142, an outside air intake 143, and an air supply air outlet 144.

The return air intake 141 is used to take in the air (return air) RA from the indoor space S1 into the casing 131. The exhaust outlet 142 is used to discharge the return air RA taken into the casing 131 to the outdoor space S2 as an exhaust EA. The outside air intake port 143 is used to take in the air (outside air) OA from the outdoor space S2 into the casing 131. The supply air outlet 144 is used to supply the outside air OA taken into the casing 131 to the indoor space S1 as the supply air SA.

The outside air intake port 143 and the exhaust air outlet 142 are connected to the outdoor space S2 via

ducts

145a and 145b, respectively, as described in FIG. The return air intake 141 and the air supply outlet 144 are connected to the indoor space S1 via

ducts

145c and 145d.

As shown in FIG. 13, inside the casing 131, the return air RA taken in from the return air intake 141 passes through the total heat exchanger 132, and is exhausted as exhaust EA from the exhaust outlet 142 to the outdoor space S2. .. Hereinafter, this air flow is also referred to as "first air flow F1".
The outside air OA taken in from the outside air intake port 143 passes through the total heat exchanger 132 and is supplied as the supply air SA from the supply air outlet 144 to the indoor space S1. Hereinafter, this air flow is also referred to as "second air flow F2".

FIG. 16 is a perspective view of the total heat exchanger.
The total heat exchanger 132 in the present embodiment is an orthogonal total heat exchanger configured so that the first air flow F1 and the second air flow F2 are substantially orthogonal to each other. The total heat exchanger 132 has a partition plate 132a and a partition plate (spacing plate) 132b, as described with reference to FIG. The partition plate 132a and the partition plate 132b are alternately laminated with an appropriate adhesive. The total heat exchanger 132 is formed in a substantially quadrangular column shape as a whole.

The partition plate 132a has heat transfer property and moisture permeability, and is formed in a flat plate shape. The partition plate 132a also has a property of allowing the refrigerant to permeate.
The partition plate 132b is formed in a corrugated plate shape in which a substantially triangular cross section is continuously formed. The partition plate 132b forms an air passage between two adjacent partition plates 132a. The partition plate 132b is laminated by changing the angle of 90 degrees for each partition plate 132a and the partition plate 132b in the stacking direction (vertical direction in FIG. 16). As a result, the exhaust side passage 32c for passing the first air flow F1 and the air supply side passage 32d for passing the second air flow F2 are orthogonal to each other on both sides of the one partition plate 132a. Is formed. The air flowing through the exhaust side passage 32c and the air flowing through the air supply side passage 32d are exchanged for sensible heat and latent heat (total heat exchange) via a partition plate 132a having heat transfer property and moisture permeability. ing.

As shown in FIGS. 13 to 15, the inside of the casing 131 is divided into two regions, the indoor space S1 side and the outdoor space S2 side, by the total heat exchanger 132. As shown in FIGS. 13 and 14, an upstream exhaust air passage 146a is formed in the casing 131 on the upstream side of the first air flow F1 from the total heat exchanger 132, and is more than the total heat exchanger 132. A downstream exhaust air passage 146b is formed on the downstream side of the first air flow F1. The first exhaust air that allows the indoor space S1 (see FIG. 5) and the outdoor space S2 (see FIG. 5) to communicate with each other via the total heat exchanger 132 by the upstream exhaust air passage 146a and the downstream exhaust air passage 146b. Road 146 is constructed.

As shown in FIGS. 13 and 15, an upstream air supply air passage 147a is formed in the casing 131 on the upstream side of the second air flow F2 from the total heat exchanger 132, and is more than the total heat exchanger 132. A downstream air supply air passage 147b is formed on the downstream side of the second air flow F2. The upstream air supply air passage 147a and the downstream air supply air passage 147b constitute a first air supply air passage 147 that connects the indoor space S1 and the outdoor space S2 via the total heat exchanger 132.

As shown in FIGS. 14 and 15, a partition wall 151 is provided between the upstream exhaust air passage 146a and the downstream air supply air passage 147b. A partition wall 152 is provided between the downstream exhaust air passage 146b and the upstream air supply air passage 147a.

As shown in FIGS. 13 and 14, an exhaust fan 133 is arranged in the vicinity of the exhaust outlet 142 in the downstream exhaust air passage 146b. By driving the exhaust fan 133, a first air flow F1 is generated, and the return air RA from the indoor space S1 passes through the first exhaust air passage 146 and is discharged to the outdoor space S2 as an exhaust EA.

As shown in FIGS. 13 and 15, in the downstream air supply air passage 147b, an air supply fan 134 is arranged in the vicinity of the air supply outlet 144. By driving the air supply fan 134, a second air flow F2 is generated, and the outside air OA of the outdoor space S2 passes through the first air supply air passage 147 and is supplied to the indoor space S1 as the supply air SA.

As shown in FIG. 13, a second air supply air passage 148 and an opening / closing mechanism 135 are provided in the casing 131 of the present embodiment.
The second air supply air passage 148 is formed between the outside air intake port 143 and the air supply air outlet 144, and communicates with each other. The second air supply air passage 148, the upstream air supply air passage 147a, and the total heat exchanger 132 are partitioned by a partition wall 153. The second air supply air passage 148 communicates the indoor space S1 and the outdoor space S2 without passing through the total heat exchanger 132. The downstream side of the second air supply air passage 148 merges with the downstream air supply air passage 147b.

The opening / closing mechanism 135 has an air supply damper (air supply opening / closing mechanism) 151 that switches between the first air supply air passage 147 and the second air supply air passage 148 to open and close. The air supply damper 155 is swingably attached to the partition wall 153, for example. The air supply damper 155 is driven by a motor (not shown). The air supply damper 155 opens the first air supply air passage 147 to communicate with the outside air intake 143, and closes the second air supply air passage 148 with respect to the outside air intake 143, and the first air supply air passage 147. And the second mode in which both the second air supply air passage 148 and the second air supply air passage 148 are opened to communicate with the outside air intake 143 are switched.

FIG. 17 is a schematic cross-sectional explanatory view of the ventilation device that performs the second ventilation operation as viewed from above. FIG. 18 is a schematic cross-sectional explanatory view taken along the line CC of FIG.
When the air supply damper 155 is switched to the first mode, as shown in FIG. 13, the second air flow F2 passing through the outside air intake port 143 to the first air supply air passage 147 and the return air intake inlet 141 to the first Both the first air flow F1 passing through the exhaust air passage 146 passes through the total heat exchanger 132, and sensible heat and latent heat are exchanged between the two airs. When the air supply damper 155 is switched to the second mode, as shown in FIGS. 17 and 18, the second air flow F2 passing through the first air supply air passage 147 from the outside air intake port 143 and the return air intake port 141. The first air flow F1 passing through the first exhaust air passage 146 and the first air flow F1 both pass through the total heat exchanger 132, and sensible heat and latent heat are exchanged between the two airs. Heat between the air flow (third air flow) F3 passing from the outside air intake port 143 to the second air supply air passage 148 and the first air flow F1 passing through the return air intake inlet 141 to the first exhaust air passage 146. No exchange is done.

As described with reference to FIG. 5, the controller (control unit) 36 (hereinafter, also referred to as a ventilation controller) of the ventilation device 112 includes an exhaust fan 133, an air supply fan 134, and an opening / closing mechanism 135 (air supply damper 155). ) Controls the operation. As shown in FIG. 13, the ventilation controller 136 is housed in the control box 137 included in the casing 131. The ventilation controller 136 includes a processor such as a CPU, a microcomputer provided with a memory such as RAM and ROM, and the like. The ventilation controller 136 exerts a predetermined function by executing a program installed in the memory by the processor. The ventilation controller 136 is communicably connected to the air conditioning controller 124 of the air conditioner 111.

The ventilation controller 136 responds to the "first ventilation operation" performed for normal ventilation of the indoor space S1 and the refrigerant leakage by controlling the operations of the exhaust fan 133, the air supply fan 134, and the opening / closing mechanism 135. It is executed by switching between "second ventilation operation".
As shown in FIGS. 13 to 15, the first ventilation operation is performed by driving the exhaust fan 133 and the air supply fan 134 and switching the air supply damper 155 of the opening / closing mechanism 135 to the first mode. As a result, the return air RA from the indoor space S1 is discharged to the outdoor space S2, and the outside air OA from the outdoor space S2 is supplied to the indoor space S1 to ventilate the indoor space S1. Further, sensible heat and latent heat are exchanged between the return air RA from the indoor space S1 and the outside air OA from the outdoor space S2, and changes in temperature and humidity in the indoor space S1 can be suppressed.

The second ventilation operation corresponding to the refrigerant leakage is the operation performed when the refrigerant in the air conditioner 111 leaks. When the refrigerant sensor 126 provided in the indoor unit 122 detects the leakage of the refrigerant, the detection signal is input to the air conditioning controller 124. The air conditioning controller 124 transmits information indicating that a refrigerant leak has occurred (refrigerant leak information) to the ventilation controller 136, and the ventilation controller 136 sends the exhaust fan 133, the air supply fan 134, and the air supply fan 134 based on the refrigerant leak information. Controls the operation of the opening / closing mechanism 135.

Specifically, the ventilation controller 136 drives the exhaust fan 133 and the air supply fan 134 when a refrigerant leak occurs and the refrigerant sensor 126 detects the leaked refrigerant, and the air supply damper 155 is set to the second mode. Switch. If the exhaust fan 133 and the air supply fan 134 have already been driven, the drive is continued as it is. As a result, as shown in FIGS. 17 and 18, the return air RA from the indoor space S1 passes through the first exhaust air passage 146 and is discharged to the outdoor space S2 via the total heat exchanger 132. The outside air OA from the outdoor space S2 passes through the first air supply air passage 147 and the second air supply air passage 148, partly via the total heat exchanger 132, and partly via the total heat exchanger 132. It is supplied to the indoor space S1 without being used.

As described above, in the ventilation device 112 of the present embodiment, when the refrigerant leaks from the indoor unit 122, both the first air supply air passage 147 and the second air supply air passage 148 are opened and the air supply air passage is expanded. However, the ventilation volume can be increased as compared with the first ventilation operation. Therefore, ventilation can be further promoted, and the refrigerant can be discharged from the indoor space S1 in a short time. Further, in the present embodiment, the balance between the supply air and the exhaust becomes "air supply rich", the amount of leaked air is increased by making the room R a positive pressure, the leaked refrigerant is discharged quickly, and the leaked refrigerant in the room is discharged. The concentration can be reduced.

[Fifth Embodiment]
FIG. 19 is a schematic cross-sectional explanatory view of the air conditioning system according to the fifth embodiment of the present disclosure, which is a top view of the ventilation device that performs the second ventilation operation.
The ventilation device 112 of the fifth embodiment includes a second exhaust air passage 149 in place of the second air supply air passage 148 in the first embodiment. The second exhaust air passage 149 is formed between the return air intake inlet 141 and the exhaust air outlet 142, and communicates with each other. The second exhaust air passage 149, the upstream exhaust air passage 146a, and the total heat exchanger 132 are partitioned by a partition wall 154. The downstream side of the second exhaust air passage 149 merges with the downstream exhaust air passage 146b. From the above, the second exhaust air passage 149 communicates the indoor space S1 and the outdoor space S2 without passing through the total heat exchanger 132.

The opening / closing mechanism 135 has an exhaust damper (exhaust opening / closing mechanism) 156 that switches between the first exhaust air passage 146 and the second exhaust air passage 149 to open and close. The exhaust damper 156 is swingably attached to the partition wall 154, for example. The exhaust damper 156 has a first aspect in which the first exhaust air passage 146 is opened to communicate with the return air intake 141 and the second exhaust air passage 149 is closed with respect to the return air intake 141, and the first exhaust air. The second mode in which both the passage 146 and the second exhaust air passage 149 are opened to communicate with the return air intake 141 is switched.

In the present embodiment, when the normal first ventilation operation is performed, the ventilation controller 136 switches the exhaust damper 156 to the first mode. The ventilation device 112 ventilates while exchanging sensible heat and latent heat in the total heat exchanger 132 in the form shown in FIGS. 13 to 15.
When the refrigerant sensor 126 detects the leakage of the refrigerant, the ventilation device 112 switches the exhaust damper 156 to the second mode by the ventilation controller 136 as shown in FIG. 19, and performs the second ventilation operation. In this case, the outside air OA taken into the casing 131 from the outside air intake port 143 passes through the total heat exchanger 132 and is supplied into the room as the supply air SA from the supply air outlet 144. The return air RA from the indoor space S1 taken into the casing 131 from the return air intake 141 passes through the first exhaust air passage 146 and the second exhaust air passage 149, and a part of the return air RA passes through the total heat exchanger 132. , The other part is discharged from the exhaust outlet 142 to the outdoor space S2 without passing through the total heat exchanger 132.

Therefore, total heat exchange between the second air flow F2 passing from the outside air intake port 143 to the first air supply air passage 147 and the first air flow F1 passing through the return air intake inlet 141 to the first exhaust air passage 146. Is performed, but the second air flow F2 passing through the first air supply air passage 147 from the outside air intake 143 and the air flow (fourth air flow) F4 passing through the second exhaust air passage 149 from the return air intake inlet 141 No total heat exchange is performed with.

In the ventilation device 112 of the present embodiment, when the refrigerant leaks from the indoor unit 122, both the first exhaust air passage 146 and the second exhaust air passage 149 are opened and the exhaust air passage is expanded to expand the first ventilation. Ventilation can be increased more than driving. Therefore, ventilation can be further promoted, and the refrigerant can be discharged from the indoor space S1 in a short time. Further, in the present embodiment, the balance between the supply air and the exhaust gas becomes "exhaust rich", and by making the room R a negative pressure, it is possible to suppress the leakage refrigerant from diffusing into another room or space.

[Sixth Embodiment]
FIG. 20 is a schematic cross-sectional explanatory view of the air conditioning system according to the sixth embodiment of the present disclosure, which is a top view of the ventilation device that performs the second ventilation operation.
The ventilation device 112 of the present embodiment includes both the second air supply air passage 148 described in the fourth embodiment and the second exhaust air passage 149 described in the fifth embodiment. The ventilation device 112 includes an air supply damper 155 corresponding to the second air supply air passage 148 and an exhaust damper 156 corresponding to the second exhaust air passage 149 as the opening / closing mechanism 135.

The ventilation device 112 of the present embodiment switches each

damper

155, 156 to the first mode when performing the normal first ventilation operation, and sensible heat is generated in the total heat exchanger 132 in the embodiment shown in FIGS. 13 to 15. And ventilate while exchanging latent heat.
When the refrigerant sensor 126 detects the leakage of the refrigerant, the ventilation device 112 switches the

dampers

155 and 156 to the second mode by the ventilation controller 136 to perform the second ventilation operation as shown in FIG. In this case, the outside air OA taken into the casing 131 from the outside air intake port 143 is supplied to the indoor space S1 through the first air supply air passage 147 and the second air supply air passage 148, and is supplied from the return air intake 141 to the casing 131. The return air RA taken in is discharged to the outdoor space S2 through the first exhaust air passage 146 and the second exhaust air passage 149.

In the ventilation device 112 of the present embodiment, when the refrigerant leaks from the indoor unit 122, both the air supply air passage and the exhaust air passage are expanded, and the ventilation volume can be increased as compared with the first ventilation operation. Therefore, ventilation can be further promoted, and the refrigerant can be discharged from the indoor space S1 in a short time. In the present embodiment, for example, by changing the ratio between the rotation speed of the air supply fan 134 and the rotation speed of the exhaust fan 133, the balance between the air supply and the exhaust gas at the time of refrigerant leakage is set to " It can be changed to "air supply rich" or "exhaust rich".

[7th Embodiment]
FIG. 21 is a plan view, a right side view, and a left side view showing a schematic structure of a ventilation device of the air conditioning system according to the seventh embodiment of the present disclosure.
The basic configuration of the ventilation device 112 in the present embodiment is substantially the same as the ventilation device 112 (see FIG. 6) described in the third embodiment. The ventilator 112 includes a casing 158, an opening / closing mechanism 135, a controller 136 (see FIG. 5), and a refrigerant circuit 161 (see FIG. 8).

As described in the third embodiment, the inside of the casing 158 is the first humidity control chamber 162, the second humidity control chamber 163, the return air side passage 164, the outside air side passage 165, the air supply side passage 166, and the exhaust side. It is divided into a passage 167, an air supply fan chamber 168, and an exhaust fan chamber 169. Further, an air supply side bypass passage 193 is partitioned and formed inside the casing 158 of the present embodiment.

Specifically, on the left side of the 4th side plate 158d, the 8th partition wall 170h is provided in parallel with the 4th side plate 158d at intervals. The eighth partition wall 170h forms an air supply side bypass passage 193 between the first humidity control chamber 162, the air supply side passage 166, and the exhaust side passage 167 and the fourth side plate 158d. The rear end of the air supply side bypass passage 193 communicates with the outside air side passage 165.

The casing 158 has a "first air supply air passage" and a "first exhaust air passage".
The first air supply air passage is from the outside air intake 143 to the air supply outlet 144 through the outside air side passage 165, the first or second

humidity control chamber

162, 163, the air supply side passage 166, and the air supply fan chamber 168. It is a flow path of air leading up to it. The first air supply air passage has two systems, one passing through the first humidity control chamber 162 and the other passing through the second humidity control chamber 163. When the air supply fan 134 is activated, an air flow is generated in each first air supply air passage.

The first exhaust air passage reaches the exhaust outlet 142 from the return air intake 141 through the return air passage 164, the first or second

humidity control chamber

162, 163, the exhaust side passage 167, and the exhaust fan chamber 169. It is a flow path of air up to. The first exhaust air passage has two systems, one passing through the first humidity control chamber 162 and the other passing through the second humidity control chamber 163. When the exhaust fan 133 is activated, an air flow is generated in each exhaust air passage.

Casing 158 further has a "second air supply air passage". The second air supply air passage is an air flow path from the outside air intake port 143 to the air supply outlet 144 through the outside air side passage 165, the air supply side bypass passage 193, and the air supply fan chamber 168. Including the second air supply air passage, the casing 158 has three air supply air passages.

The first air supply air passage and the second air supply air passage are formed by an opening / closing mechanism 183 for air supply. The first air supply air passages of the two systems are alternately switched and opened and closed by the opening and closing mechanism 183 for air supply.
The first exhaust air passage is formed by an opening / closing mechanism 184 for exhaust. The two exhaust air passages are alternately switched and opened and closed by the exhaust opening / closing mechanism 184.

In addition, when the first air supply air passage or the first exhaust air passage of the two systems is "alternately switched to open and close", the operation of closing the other air passage when one of the air passages is opened is alternately performed. Say that. In order to realize this operation, the air supply opening / closing mechanism 183 and the exhaust opening / closing mechanism 184 are controlled by the controller 136.

(Structure of opening / closing mechanism)
The basic configuration of the opening / closing mechanism 135 in this embodiment is the same as that of the opening / closing mechanism 135 described in the third embodiment. Further, the opening / closing mechanism 135 of the present embodiment has a third air supply damper 179 provided on the fifth compartment wall 170e in addition to the plurality of dampers 171 to 178 described above.

The third air supply damper 179 is provided at the right end of the fifth compartment wall 170e. When the third air supply damper 179 is opened, the air supply side bypass passage 193 and the air supply fan chamber 168 are communicated with each other. When the third air supply damper 179 is closed, the air supply side bypass passage 193 and the air supply fan chamber 168 are shut off.

FIG. 22 is an explanatory diagram briefly showing the air flow flowing through the first air supply air passage and the second air supply air passage of the two systems and the air flow flowing through the exhaust air passage of the two systems.
The first and second

outside air dampers

173, 174, and the first to third

air supply dampers

175, 176, 179 constitute an air supply opening / closing mechanism 183. The first and second

return air dampers

171 and 172, and the first and

second exhaust dampers

177 and 178 constitute an exhaust opening / closing mechanism 184.

The first air supply air passage and the second air supply air passage of the two systems are opened by the operation of the following dampers, respectively.
1st air supply air passage of 1st system: Opening operation of 1st outside air damper 173 and 1st air supply damper 175 1st air supply air passage of 2nd system: Opening operation of 2nd outside air damper 174 and 2nd air supply damper 176 2nd air supply air passage: Opening operation of the 3rd air supply damper 179 In FIG. 22, the air flow flowing through the 1st air supply air passage of the 1st system is indicated by the symbol Fa1 and flows through the 1st air supply air passage of the 2nd system. The air flow is indicated by Fa2, and the air flow flowing through the second air supply air passage is indicated by Fa3.

The first exhaust air passages of the two systems are opened by the operation of the following dampers, respectively.
First exhaust air passage of the first system: Opening operation of the first return air damper 171 and the first exhaust damper 177 Opening operation of the first exhaust air passage of the second system: the second return air damper 172 and the second exhaust damper 178. In FIG. 22, the air flow flowing through the first exhaust air passage of the first system is indicated by reference numeral Fb1, and the air flow flowing through the first exhaust air passage of the second system is indicated by Fb2.

The refrigerant circuit 161 in the ventilation device 112 of the present embodiment is the same as the refrigerant circuit 161 of the third embodiment described with reference to FIG. The ventilation controller (control unit) 136 of the present embodiment is also the same as the ventilation controller 136 of the third embodiment.

(Details of ventilation operation)
The ventilation controller 136 controls the operation of the exhaust fan 133, the air supply fan 134, the refrigerant circuit 161 and the opening / closing mechanism 135, thereby performing the "first ventilation operation" for normal ventilation of the indoor space S1 and the refrigerant. It is executed by switching between the "second ventilation operation" corresponding to the leakage.

The first and

second heat exchangers

(First operation of the first ventilation operation)
In the first operation of the first ventilation operation, the first and second air supply air passages and the first exhaust air passage in the casing 158 are set as shown in FIG. 23. Specifically, the second return air damper 172, the first outside air damper 173, the first supply air damper 175, and the second exhaust damper 178 are opened, and the first return air damper 171 and the second outside air damper 174 and the second The air supply damper 176, the first exhaust damper 177, and the third air supply damper 179 are closed. In FIG. 23, the damper in the closed state is hatched.

As a result, the first air supply air passage of the first system and the first exhaust air passage of the second system are formed in the casing 158, and the outside air OA taken into the casing 158 passes through the first heat exchanger 186. The return air RA supplied into the room and taken into the casing 158 passes through the second heat exchanger 189 and is discharged to the outside.

The outside air OA that has passed through the outside air intake 143 and is taken into the outside air side passage 165 passes through the first outside air damper 173 and flows into the first humidity control chamber 162, and exchanges the first heat in the first humidity control chamber 162. Humidification (dehumidification or humidification) is performed through the vessel 186. Specifically, in the dehumidifying / ventilation operation, the outside air OA passes through the first heat exchanger 186 which is an evaporator to be dehumidified and cooled, and in the humidifying / ventilation operation, the outside air OA is a condenser. It passes through the heat exchanger 186 to be humidified and heated. The air conditioned in the first heat exchanger 186 passes through the first air supply damper 175, the air supply side passage 166, the air supply fan chamber 168, and the air supply outlet 144 in this order, and is supplied to the indoor space S1. To.

The return air RA that has passed through the return air intake 141 and is taken into the return air side passage 164 passes through the second return air damper 172 and flows into the second humidity control chamber 163, and in the second humidity control chamber 163. Humidification (humidification or dehumidification) is performed through the second heat exchanger 189. Specifically, in the dehumidifying ventilation operation, the return air RA passes through the second heat exchanger 189, which is a condenser, to be humidified and heated, and in the humidification ventilation operation, the return air RA is an evaporator. It passes through the second heat exchanger 189 to be dehumidified and cooled. The air regulated by the second heat exchanger 189 passes through the second exhaust damper 178, the exhaust side passage 167, the exhaust fan chamber 169, and the exhaust outlet 142 in this order, and is discharged to the outside of the room.

(Second operation of the first ventilation operation)
In the second operation of the first ventilation operation, the first and second air supply air passages and the first exhaust air passage in the casing 158 are set as shown in FIG. 24. Specifically, the first return air damper 171, the second outside air damper 174, the second supply air damper 176, and the first exhaust damper 177 are in the open state, the second return air damper 172, the first outside air damper 173, and the first. The air supply damper 175, the second exhaust damper 178, and the third air supply damper 179 are closed. As a result, the first air supply air passage of the second system and the first exhaust air passage of the first system are formed in the casing 158, and the outside air OA taken into the casing 158 passes through the second heat exchanger 189. The return air RA supplied into the room and taken into the casing 158 passes through the first heat exchanger 186 and is discharged to the outside.

The outside air OA that has passed through the outside air intake 143 and is taken into the outside air side passage 165 passes through the second outside air damper 174 and flows into the second humidity control chamber 163, and exchanges the second heat in the second humidity control chamber 163. Humidification (dehumidification or humidification) is performed through the vessel 189. Specifically, in the dehumidifying / ventilation operation, the outside air OA passes through the second heat exchanger 189 which is an evaporator to be dehumidified and cooled, and in the humidifying / ventilation operation, the outside air OA is a condenser. It passes through the heat exchanger 189 to be humidified and heated. The air conditioned in the second heat exchanger 189 passes through the second air supply damper 176, the air supply side passage 166, the air supply fan chamber 168, and the air supply outlet 144 in this order, and is supplied to the indoor space S1. To.

The return air RA that has passed through the return air intake 141 and is taken into the return air side passage 164 passes through the first return air damper 171 and flows into the first humidity control chamber 162, and in the first humidity control chamber 162. Humidification (humidification or dehumidification) is performed through the first heat exchanger 186. Specifically, in the dehumidifying ventilation operation, the return air RA passes through the first heat exchanger 186, which is a condenser, to be humidified and heated, and in the humidification ventilation operation, the return air RA is an evaporator. It passes through the first heat exchanger 186 to be dehumidified and cooled. The air conditioned in the first heat exchanger 186 passes through the first exhaust damper 177, the exhaust side passage 167, the exhaust fan chamber 169, and the exhaust outlet 142 in this order, and is discharged to the outside of the room.

<Second ventilation operation>
The second ventilation operation corresponding to the refrigerant leakage is an operation performed when the refrigerant in the air conditioner 111 leaks and the refrigerant sensor 126 detects the leaked refrigerant. As shown in FIG. 5, when the refrigerant sensor 126 provided in the indoor unit 122 detects the leaked refrigerant, the detection signal is input to the air conditioning controller 124. The air conditioning controller 124 transmits information indicating that a refrigerant leak has occurred (refrigerant leak information) to the ventilation controller 136, and the ventilation controller 136 transmits the exhaust fan 133, the air supply fan 134, and the air supply fan 134 based on the refrigerant leak information. Controls the operation of the opening / closing mechanism 135.

FIG. 25 is a schematic view for explaining the first operation of the second ventilation operation. FIG. 26 is a schematic view for explaining the second operation of the second ventilation operation.
In the second ventilation operation, the "first operation" and the "second operation" are performed in the same manner as in the first ventilation operation. The first operation of the second ventilation operation is an operation of supplying air using the second air supply air passage in addition to the first operation of the first ventilation operation. The second operation of the second ventilation operation is an operation of supplying air using the second air supply air passage in addition to the second operation of the first ventilation operation.

When performing the second ventilation operation, the ventilation controller 136 keeps the third air supply damper 179 in a constantly open state. As a result, the second air supply air passage is in an open state during the second ventilation operation. Therefore, by operating the air supply fan 134, in addition to the air supply SA to the indoor space S1 passing through the first air supply air passage of the first system or the second system, air is supplied to the indoor space S1 passing through the second air supply air passage. SA is performed. When both the first and second air supply air passages are opened in this way, the entire air supply air passage is expanded, and the ventilation volume can be increased as compared with the first ventilation operation. Therefore, the refrigerant can be discharged from the indoor space S1 in a short time. Further, in the present embodiment, the balance between the supply air and the exhaust becomes "air supply rich", the amount of leaked air is increased by making the room R a positive pressure, the leaked refrigerant is discharged quickly, and the leaked refrigerant in the room is discharged. The concentration can be reduced.

[8th Embodiment]
FIG. 27 is a schematic view for explaining the first operation of the second ventilation operation of the ventilation device of the air conditioning system according to the eighth embodiment of the present disclosure. FIG. 28 is a schematic view for explaining the second operation of the second ventilation operation of the ventilation device.
In the ventilation device 112 of the present embodiment, the air supply side bypass passage 193 described in the seventh embodiment is not provided inside the casing 158, and instead, the exhaust side bypass passage 194 is provided. ..

Inside the casing 158, a ninth partition wall 170i is provided in parallel with the third side plate 158c at intervals on the right side of the third side plate 158c. The ninth partition wall 170i is an exhaust side bypass passage between the return air side passage 164, the outside air side passage 165, the second humidity control chamber 163, the air supply side passage 166, and the exhaust side passage 167 and the third side plate 158c. Form 194. The rear end of the exhaust side bypass passage 194 communicates with the return air side passage 164.

The casing 158 has a "second exhaust air passage" instead of the "second air supply air passage" in the seventh embodiment. The second exhaust air passage is an air flow path from the return air intake 141 to the exhaust air outlet 142 through the return air side passage 164, the exhaust side bypass passage 194, and the exhaust fan chamber 169. Including the second exhaust air passage, the casing 158 has three exhaust air passages.

The opening / closing mechanism 135 of the present embodiment is provided with a third exhaust damper 180 at the left end of the fifth section wall 170e instead of the third air supply damper 179 of the seventh embodiment. The third exhaust damper 180 constitutes an exhaust opening / closing mechanism 184. When the third exhaust damper 180 is opened, the exhaust side bypass passage 194 and the exhaust fan chamber 169 are communicated with each other, and the second exhaust air passage is opened. When the third exhaust damper 180 is closed, the exhaust side bypass passage 194 and the exhaust fan chamber 169 are shut off.

In the present embodiment, the first ventilation operation of the ventilation device 112 is performed in the same manner as in the seventh embodiment.
In the present embodiment, the second ventilation operation of the ventilation device 112 is performed as the "first operation" and the "second operation" in the same manner as the first ventilation operation. The first operation of the second ventilation operation is an operation of performing exhaust using the second exhaust air passage in addition to the first operation of the first ventilation operation. The second operation of the second ventilation operation is an operation of performing exhaust using the second exhaust air passage in addition to the second operation of the first ventilation operation.

When performing the second ventilation operation, the ventilation controller 136 always keeps the third exhaust damper 180 in the open state. As a result, the second exhaust air passage is in an open state during the second ventilation operation. Therefore, by operating the exhaust fan 133, in addition to the exhaust EA to the outdoor space S2 passing through the first exhaust air passage of the first system or the second system, the exhaust EA to the outdoor space S2 passing through the second exhaust air passage is performed. It is said. When both the first and second exhaust air passages are opened in this way, the entire exhaust air passage is expanded, and the ventilation volume can be increased as compared with the first ventilation operation. Therefore, the refrigerant can be discharged from the indoor space S1 in a short time. Further, in the present embodiment, the balance between the supply air and the exhaust gas becomes "exhaust rich", and by making the room R a negative pressure, it is possible to suppress the leakage refrigerant from diffusing into another room or space.

[9th Embodiment]
FIG. 29 is a schematic view for explaining the first operation of the second ventilation operation of the ventilation device of the air conditioning system according to the ninth embodiment of the present disclosure. FIG. 30 is a schematic view for explaining the second operation of the second ventilation operation of the ventilation device.
In the ventilation device 112 of the present embodiment, the air supply side bypass passage 193 and the third air supply damper 179 described in the fourth embodiment and the exhaust side bypass passage described in the fifth embodiment are inside the casing 158. 194 and a third exhaust damper 180 are provided. The casing 158 has a second air supply air passage described in the seventh embodiment and a second exhaust air passage described in the eighth embodiment.

In the present embodiment, the first ventilation operation of the ventilation device 112 is performed in the same manner as in the seventh embodiment.
In the present embodiment, the second ventilation operation of the ventilation device 112 is performed as the "first operation" and the "second operation" in the same manner as the first ventilation operation. The first operation of the second ventilation operation is an operation of performing air supply using the second air supply air passage and exhaust air using the second exhaust air passage in addition to the first operation of the first ventilation operation. The second operation of the second ventilation operation is an operation of supplying air using the second air supply air passage and exhausting air using the second exhaust air passage in addition to the second operation of the first ventilation operation.

When performing the second ventilation operation, the ventilation controller 136 always keeps the third air supply damper 179 and the third exhaust damper 180 open. As a result, during the second ventilation operation, the second air supply air passage and the second exhaust air passage are in an open state. Therefore, by operating the air supply fan 134, in addition to the air supply SA to the indoor space S1 passing through the first air supply air passage of the first system or the second system, air is supplied to the indoor space S1 passing through the second air supply air passage. SA is performed. By operating the exhaust fan 133, in addition to the exhaust EA to the outdoor space S2 passing through the first exhaust air passage of the first system or the second system, the exhaust EA to the outdoor space S2 passing through the second exhaust air passage is performed. By opening both the first and second air supply air passages and the first and second exhaust air passages in this way, the entire air supply air passage and the exhaust air passage are expanded, and the first ventilation operation is performed. Can also increase ventilation. Therefore, the refrigerant can be discharged from the indoor space S1 in a short time. In the present embodiment, for example, by changing the ratio between the rotation speed of the air supply fan 134 and the rotation speed of the exhaust fan 133, the balance between the air supply and the exhaust gas at the time of refrigerant leakage is adjusted with respect to the normal operation. It can be changed to "air supply rich" or "exhaust rich".

<Action and effect of the fourth to ninth embodiments>
(1) The air conditioning system 110 in the fourth, sixth, seventh, and ninth embodiments described above is an air conditioner that generates harmonized air by exchanging heat with a refrigerant and supplies it to the indoor space S1 (air conditioning target space). It includes a 111, a refrigerant sensor 126 that detects a refrigerant leak, a ventilation device 112 that ventilates the indoor space S1, and a ventilation controller 136 that controls the ventilation device 112. The ventilation device 112 includes a first air supply air passage that communicates the

heat exchangers

132, 186, 189, the indoor space S1 and the outdoor space S2 (outside the space subject to air conditioning) via the

heat exchangers

132, 186, 189. The first exhaust air passage, the second air supply air passage that communicates the indoor space S1 and the outdoor space S2 without passing through the

heat exchangers

132, 186, 189, and the first air supply air passage and the second air supply air passage. An air supply fan 134 that supplies the air of the outdoor space S2 to the indoor space S1 via the first air passage, an exhaust fan 133 that discharges the air of the indoor space S1 to the outdoor space S2 via the first exhaust air passage, and a first air supply air passage. Also provided are air supply opening /

closing mechanisms

155 and 183 that open / close the second air supply air passage. The ventilation controller 136 controls the air supply opening /

closing mechanisms

155 and 183 so as to open both the first air supply air passage and the second air supply air passage when the refrigerant sensor 126 detects the leakage of the refrigerant.

With the above configuration, when the refrigerant leaks from the air conditioner 111 and the refrigerant sensor 126 detects the leaked refrigerant, both the first air supply air passage and the second air supply air passage are opened to supply air. The air passage can be expanded and the ventilation volume can be increased. Therefore, the refrigerant can be discharged to the outdoor space S2 in a short time.

(2) In the air conditioning system 110 according to the sixth and ninth embodiments described above, the ventilation device 112 communicates the indoor space S1 and the outdoor space S2 without passing through the

heat exchangers

132, 186, 189 and exhausts air. A second exhaust air passage for discharging the air in the indoor space S1 to the outdoor space S2 by the fan 133, and an exhaust opening /

closing mechanism

156, 184 for opening and closing the first exhaust air passage and the second exhaust air passage are further provided for ventilation. The controller 136 controls the exhaust opening /

closing mechanisms

156 and 184 so as to open both the first exhaust air passage and the second exhaust air passage when the refrigerant sensor 126 detects the leakage of the refrigerant.
With such a configuration, when the refrigerant leaks from the air conditioner 111 and the refrigerant sensor 126 detects the leaked refrigerant, both the first exhaust air passage and the second exhaust air passage are opened, so that the exhaust air passage is opened. Can be expanded and the ventilation volume can be further increased.

(3) The air conditioning system 110 according to the fifth, sixth, eighth, and ninth embodiments described above includes an air conditioner 111 that generates harmonized air by exchanging heat with the refrigerant and supplies it to the indoor space S1 and the refrigerant. It includes a refrigerant sensor 126 that detects a leak, a ventilation device 112 that ventilates the indoor space S1, and a ventilation controller 136 that controls the ventilation device 112. The ventilation device 112 includes a first air supply air passage and a first exhaust air passage that communicate the

heat exchangers

132, 186, 189 and the indoor space S1 and the outdoor space S2 via the

heat exchangers

132, 186, 189. , The air in the outdoor space S2 is transferred to the indoor space S1 via the second exhaust air passage that communicates the indoor space S1 and the outdoor space S2 without passing through the

heat exchangers

132, 186, 189 and the first air supply air passage. The supply air fan 134, the exhaust fan 133 that discharges the air in the indoor space S1 to the outdoor space S2 via the first exhaust air passage and the second exhaust air passage, and the first exhaust air passage and the second exhaust air passage. The exhaust opening /

closing mechanism

156, 184 for opening / closing the air is provided. The ventilation controller 136 controls the exhaust opening /

closing mechanism

156, 184 so as to open both the first exhaust air passage and the second exhaust air passage when the refrigerant sensor 126 detects the leakage of the refrigerant.

With the above configuration, when the refrigerant leaks from the air conditioner 111 and the refrigerant sensor 126 detects the leaked refrigerant, both the first exhaust air passage and the second exhaust air passage are opened, so that the exhaust air is blown. The road can be expanded and ventilation can be increased. Therefore, the refrigerant can be discharged to the outdoor space S2 in a short time.

[Other variants]
The present disclosure is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims.

For example, in the above-described first embodiment, six patterns have been described as changing the balance between air supply and exhaust by the ventilation device 30, but the present disclosure is not limited to these, and depending on the use of the living room, for example, It is also possible to make the exhaust air rich or the air supply rich in the normal operation, and the air volume of the air supply and the exhaust air by the ventilation device the same in the case of the refrigerant leakage.

As described as Pattern 5 and Pattern 6, what is rich in air supply during normal operation is increased in the degree of rich air supply for refrigerant leakage, and conversely, it is rich in exhaust gas during normal operation. Increasing the degree of exhaust richness in the event of a refrigerant leak is also included in the change in the balance between air supply and exhaust in the present disclosure. For example, when the air supply-rich air supply 120 m ³ / h during normal operation, from an exhaust 100 m ³ / h, when the refrigerant leakage, the air supply 150 meters ³ / h, also the exhaust 100 m ³ / h, the Included in the disclosure of air supply and exhaust balance changes.

Further, in the first, second, fourth to sixth embodiments described above, the orthogonal total heat exchanger is arranged in the ventilation device, but the heat is recovered from the return air by rotating the rotor. It is also possible to adopt a rotary total heat exchanger to perform. It is also possible to omit the adoption of such a total heat exchanger in the ventilation system.

In the second embodiment, the auxiliary fan 40 is a blower fan that supplies air to the living room, but instead of this, it can be an exhaust fan that exhausts air from the living room. Further, an auxiliary fan can be configured by the blower fan and the exhaust fan.

In the second embodiment, the auxiliary fan 40 is communicably connected to the ventilation device, but the auxiliary fan 40 can also be communicably connected to the indoor unit. In this case, when the refrigerant sensor 24 detects the leaked refrigerant, the control unit 25 of the indoor unit 20 that receives the detection signal issues a refrigerant leak signal to the auxiliary fan 40.

In the third, seventh to ninth embodiments, the refrigerant sensor may be provided in the ventilator 112. In this case, when the refrigerant sensor 126 detects the leakage of the refrigerant from the refrigerant circuit 161 of the ventilation device 112, even if the ventilation device 112 independently performs the second ventilation operation without the instruction from the air conditioner 111. Good.
In the first to ninth embodiments, the

refrigerant sensors

24 and 126 may detect the leakage of the refrigerant in the

ventilation devices

30 and 112.
In the first to ninth embodiments, the operation of the

ventilation devices

30 and 112 may be controlled by the controllers (control units) 25 and 124 of the air conditioner 111.

In the first to ninth embodiments, a cloud server (control unit) provided in a remote location different from the building in which the air conditioner is installed is provided, and this cloud server and the control unit 36 of the

ventilation devices

30, 112, The 136 and / or the

control units

25 and 124 of the air conditioner may be connected to each other via a communication network such as the Internet. In this case, when the leaked refrigerant is detected by the

refrigerant sensors

24 and 126, the information is transmitted to the cloud server via the communication network, and the cloud server sends the leaked refrigerant to the

control units

36 and 136 of the

ventilation devices

30 and 112. The air conditioning system may be configured to give an instruction to control the operation when the refrigerant leaks.

20: Indoor unit (air conditioner)
22: User side heat exchanger 24: Refrigerant sensor 30: Ventilation device 34: Blower fan 35: Exhaust fan 36: Control unit 40: Auxiliary fan 110: Air conditioning system 111: Air conditioner 112: Ventilation device 126: Refrigerant sensor 133 : Exhaust fan 134: Air supply fan 136: Ventilation controller (control unit)
146: 1st exhaust air passage 147: 1st air supply air passage 148: 2nd air supply air passage 149: 2nd exhaust air passage 155: Air supply damper (air supply opening / closing mechanism)
156: Exhaust damper (exhaust opening / closing mechanism)
161: Refrigerant circuit 183: Air supply opening / closing mechanism 184: Exhaust opening / closing mechanism 186: Heat exchanger 189: Heat exchanger

Claims

A refrigerant sensor (24,126) for detecting the leakage of refrigerant in the air-conditioned space of the air conditioner (20), a ventilation device (30,112) for supplying and exhausting air, and the ventilation device (30,112). A control unit (36, 136) that controls the operation of
The control unit (36,136) is in normal operation when the refrigerant sensor (24,126) does not detect the leakage of the refrigerant, and when the refrigerant sensor (24,126) detects the leaked refrigerant. An air conditioning system that changes the balance between air supply and exhaust of the ventilation system (30, 112).
The refrigerant is slightly flammable or flammable and
The ventilation device (30) supplies air by the fan (34) and / or exhausts by the fan (35).
The air conditioning system
An air conditioner (20) having a heat exchanger (22) that generates harmonized air by exchanging heat with a refrigerant.
It is communicably connected to the air conditioner (20) and / or the ventilation device (30), does not operate when the leaked refrigerant is not detected by the refrigerant sensor (24), and does not operate when the leaked refrigerant is detected by the refrigerant sensor (24). The air conditioning system according to claim 1, further comprising an operating auxiliary fan (40).
The ventilator (112) has two heat exchangers (186,189) carrying an adsorbent that adsorbs moisture contained in the air, and alternately alternates the two heat exchangers (186,189). A refrigerant circuit (161) that functions as an evaporator or a condenser, and two air supply air passages and two systems that communicate the inside and outside of the air-conditioned space via the heat exchangers (186, 189). The air supply fan (134) that supplies air outside the air conditioning target space into the air conditioning target space through the exhaust air passages, and the air conditioning target space via the exhaust air passages. An exhaust fan (133) that discharges the air inside to the outside of the air-conditioned space, an air supply opening / closing mechanism (183) that opens / closes the air supply air passages of the two systems, and an exhaust that opens / closes the exhaust air passages of the two systems. Equipped with an opening / closing mechanism (184)
When the refrigerant sensor (126) detects the leakage of the refrigerant, the control unit (136) operates one of the air supply fan (134) and the exhaust fan (133) to operate the other fan. The air supply opening / closing mechanism (183) is stopped so that one of the air supply air passage and the exhaust air passage corresponding to the one fan is opened and both of the other air passages are closed. ) And the air conditioning system according to claim 1, which controls the exhaust opening / closing mechanism (184).
The ventilation device (112) is a first supply that communicates the heat exchanger (132,186,189) with the inside and outside of the air-conditioned space via the heat exchanger (132,186,189). A second air supply air passage (147) and a first exhaust air passage (146) that communicate the inside and outside of the air-conditioned space without passing through the heat exchanger (132,186,189). 148), and an air supply fan (134) that supplies air outside the air-conditioned space into the air-conditioned space via the first air-conditioned air passage (147) and the second air-conditioned air passage (148). The exhaust fan (133) that discharges the air in the air-conditioned space to the outside of the air-conditioned space through the first exhaust air passage (146), the first air supply air passage (147), and the second air supply air. It is equipped with an air supply opening / closing mechanism (155, 183) that opens / closes the road (148).
The control unit (136) supplies the air supply so as to open both the first air supply air passage (147) and the second air supply air passage (148) when the refrigerant sensor (126) detects the leakage of the refrigerant. The air conditioning system according to claim 1, which controls a care opening / closing mechanism (155, 183).
The first supply in which the ventilation device (112) communicates the heat exchanger (132,186,189) with the inside and outside of the air-conditioned space via the heat exchanger (132,186,189). A second exhaust air passage (147) and a first exhaust air passage (146) that communicate the inside and outside of the air-conditioned space without passing through the heat exchanger (132,186,189). 149), an air supply fan (134) that supplies air outside the air-conditioned space to the air-conditioned space via the first air-conditioned air passage (147), and the first exhaust air passage (146). The exhaust fan (133) that discharges the air in the air-conditioned space to the outside of the air-conditioned space through the second exhaust air passage (149), the first exhaust air passage (146), and the second exhaust air. It is equipped with an exhaust opening / closing mechanism (156,184) that opens / closes the road (149).
When the refrigerant sensor (126) detects the leakage of the refrigerant, the control unit (136) opens both the first exhaust air passage (146) and the second exhaust air passage (149). The air conditioning system according to claim 1, which controls an opening / closing mechanism (156, 184).