Ventilation device with temperature adjustment function and ventilation system

Abstract

To provide a ventilation device with a temperature adjustment function capable of reliably detecting leakage of a refrigerant while suppressing instability in indoor temperature environment.SOLUTION: A normal operation mode and a leakage detection mode are included in operation modes of an air supply blower 12 and an air discharge blower 13 by a control device 17. The control device 17 stops air blowing by the air supply blower 12 in the leakage detection mode. The control device 17 switches the operation mode from the normal operation mode to the leakage detection mode when air blowing output of the designated air blower, which is at least one of the air supply blower 12 and the air discharge blower 13, is equal to or lower than an output set value.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a temperature-controlled ventilation device and ventilation system. [Background technology]

[0002] In conventional air conditioners, when the operation time of the indoor unit has passed a predetermined fixed control time, the operation of the fan is stopped and the presence or absence of refrigerant leakage is confirmed by a refrigerant sensor (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6847213 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional air conditioners described above, even if there is no refrigerant leakage, the operation of the fan is stopped at each scheduled control time, which makes the indoor temperature environment unstable.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a ventilation device and ventilation system with a temperature control function that can more reliably detect refrigerant leaks while suppressing instability in the indoor temperature environment. [Means for solving the problem]

[0006] The ventilation device with temperature control function according to the present disclosure includes a casing in which an intake passageway, which is a passageway for air from the outdoors to the indoors, and an exhaust passageway, which is a passageway for air from the indoors to the outdoors, an intake fan provided in the intake passageway, an exhaust fan provided in the exhaust passageway, a heat exchanger provided within the casing and performing heat exchange between the air passing through the intake passageway and the air passing through the exhaust passageway, a temperature control coil that adjusts the temperature of the air passing through the intake passageway, a refrigerant sensor that detects refrigerant contained in the air passing through the intake passageway, and a control device that controls the intake fan, the exhaust fan, and the temperature control coil. The operation modes of the intake fan and the exhaust fan operated by the control device include a normal operation mode in which the intake fan and the exhaust fan are operated to perform ventilation, and a leak detection mode in which the air blown by the intake fan is stopped and the refrigerant sensor detects refrigerant contained in the air passing through the intake passageway, and the control device switches the operation mode from the normal operation mode to the leak detection mode when the blowing output of at least one of the intake fan and the exhaust fan falls below an output set value. [Effects of the Invention]

[0007] According to the present disclosure, refrigerant leakage can be detected more reliably while suppressing instability in the indoor temperature environment. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic configuration diagram showing a ventilation device with a temperature control function according to a first embodiment. [Figure 2] FIG. 2 is a block diagram showing a control system of the ventilation device with temperature control function of FIG. 1. [Figure 3] 3 is a flowchart showing the operation of the control device of FIG. 2. [Figure 4] FIG. 10 is a schematic configuration diagram showing a ventilation device with a temperature control function according to a second embodiment. [Figure 5] FIG. 5 is a block diagram showing a control system of the ventilation device with temperature control function of FIG. [Figure 6] 6 is a flowchart showing the operation of the control device of FIG. 5. [Figure 7]2 is a configuration diagram showing a first example of a processing circuit that realizes each function of the control device according to the first and second embodiments. FIG. [Figure 8] 10 is a configuration diagram showing a second example of a processing circuit that realizes each function of the control device according to the first and second embodiments. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described with reference to the drawings. Embodiment 1 1 is a schematic diagram showing the configuration of a ventilator with temperature control function according to embodiment 1. In the figure, the ventilator with temperature control function has a casing 11, an intake air blower 12, an exhaust air blower 13, a total heat exchanger 14, a temperature control coil 15, a refrigerant sensor 16, and a control device 17.

[0010] The casing 11 is provided with an air intake port 11a, an air intake outlet 11b, an exhaust air intake port 11c, and an exhaust air outlet 11d.

[0011] The air supply inlet 11a and the air exhaust outlet 11d are provided on a first side surface of the casing 11. The air supply outlet 11b and the air exhaust inlet 11c are provided on a second side surface of the casing 11. The second side surface is a side surface that faces the first side surface and is parallel to the first side surface.

[0012] Two air passages, namely, an air supply passage 11e and an exhaust passage 11f, are formed inside the casing 11. The air supply passage 11e is a passage for air from the outside to the room, which is the space to be ventilated. The exhaust passage 11f is a passage for air from the inside to the outside.

[0013] The intake air blower 12 is provided in the intake air passage 11e, and the exhaust air blower 13 is provided in the exhaust air passage 11f.

[0014] The total heat exchanger 14 is provided between the intake passage 11e and the exhaust passage 11f inside the casing 11. The total heat exchanger 14 exchanges total heat between the air passing through the intake passage 11e and the air passing through the exhaust passage 11f.

[0015] By operating the supply air blower 12, outdoor air is drawn into the casing 11 through the supply air inlet 11a. The outdoor air drawn into the casing 11 passes through the supply air passage 11e and the total heat exchanger 14, and is blown out into the room through the supply air outlet 11b.

[0016] Furthermore, by operating the exhaust fan 13, indoor air is taken into the casing 11 through the exhaust inlet 11c. The indoor air sucked into the casing 11 passes through the exhaust passage 11f and the total heat exchanger 14, and is blown out to the outside through the exhaust outlet 11d.

[0017] The temperature adjustment coil 15 is provided in the air supply passage 11e downstream of the air supply fan 12, i.e., closer to the room than the air supply fan 12. The temperature adjustment coil 15 adjusts the temperature of the air passing through the air supply passage 11e by heating or cooling the air passing through the air supply passage 11e.

[0018] A refrigerant flows through the temperature control coil 15. A low GWP (Global Warming Potential) refrigerant having slight flammability is used as the refrigerant.

[0019] The refrigerant sensor 16 detects refrigerant contained in the air passing through the supply air passage 11 e on the indoor side of the temperature control coil 15 , that is, refrigerant leaking from the temperature control coil 15 .

[0020] The control device 17 controls the intake air blower 12, the exhaust air blower 13, and the temperature adjustment coil 15. A signal from the refrigerant sensor 16 is also input to the control device 17.

[0021] The operation modes of intake air blower 12 and exhaust air blower 13 controlled by control device 17 include a normal operation mode and a leak detection mode. In the normal operation mode, intake air blower 12 and exhaust air blower 13 are operated to ventilate the room while adjusting the temperature. In the leak detection mode, control device 17 stops air blowing by intake air blower 12 and checks whether refrigerant sensor 16 detects refrigerant.

[0022] When the air blowing output of a designated fan, which is at least one of air supply fan 12 and exhaust fan 13, falls below an output set value, control device 17 switches the operation mode from the normal operation mode to the leak detection mode. The designated fans in embodiment 1 are both air supply fan 12 and exhaust fan 13.

[0023] An output set value is preset in the control device 17. The output set value is set to an airflow output at which the supply airflow rate or exhaust airflow rate does not function as a safety device, i.e., an airflow rate that does not satisfy the ventilation airflow rate required for the safety device. For example, the output set value is the lower limit of the usable airflow range for a ventilation device with a temperature control function.

[0024] In the case of a refrigeration system using a slightly flammable refrigerant, the expected refrigerant concentration in the event of a refrigerant leak is calculated based on the amount of refrigerant charged in the refrigeration system and the volume of each air-conditioned object. If the refrigerant concentration in the room exceeds a standard value, for example, 1 / 4 of the flammable concentration, a mechanical ventilation system or a shutoff valve must be activated as a safety device to prevent the refrigerant concentration from reaching a flammable level.

[0025] For example, JRA GL-20 and GL-16, and JIS C 9335 2-40 stipulate that ventilation and agitation operations for air-conditioned objects should be performed at air volumes greater than or equal to the air volumes required by these standards.

[0026] The air volume at which the supply air volume or exhaust air volume does not function as a safety device is defined by a mathematical formula in the standard.

[0027] In addition, in the leak detection mode, the control device 17 sets the air output of the exhaust fan 13 to a preset air output.

[0028] In the leak detection mode, the type of ventilation changes from type 1 ventilation to type 3 ventilation because the air supply fan 12 stops blowing air. The air output of the exhaust fan 13 in type 3 ventilation can be set to any air output including the current air output, or to the maximum output.

[0029] When the air output of the exhaust fan 13 is set to the maximum output, it is possible to sufficiently compensate for the decrease in ventilation air volume in the space to be ventilated due to the stoppage of the intake fan 12.

[0030] In addition, in order to minimize the inflow of outside air into the air supply passage 11e and improve the accuracy of refrigerant detection, the air blowing output of the exhaust fan 13 may be set to zero, that is, the exhaust fan 13 may be stopped.

[0031] Furthermore, when the refrigerant sensor 16 does not detect any refrigerant within a set time after switching the operation mode to the leakage detection mode, the control device 17 returns the operation mode to the normal operation mode.

[0032] A set time is preset in the control device 17. The set time may be a time determined by a safety standard or may be a shorter time.

[0033] Fig. 2 is a block diagram showing a control system of the ventilation device with temperature control function of Fig. 1. Air supply blower 12 has an air supply motor 12a. Exhaust blower 13 has an exhaust motor 13a.

[0034] Although not shown in Fig. 1, the ventilation device with temperature control function also has a remote controller 18. Remote controller 18 is capable of wireless communication with control device 17. The ventilation air volume in normal operation mode can be set by the user using remote controller 18.

[0035] The control device 17 has, as control blocks, a main control unit 21, an airflow control unit 22, an airflow output estimation unit 23, a coil control unit 24, a leakage determination unit 25, a communication unit 26, and a setting correction unit 27.

[0036] The main control unit 21 controls the entire ventilation device with temperature control function. The main control unit 21 also controls the airflow control unit 22, the coil control unit 24, and the leakage determination unit 25 based on information from the airflow output estimation unit 23.

[0037] The main control unit 21 also includes a mode switching unit 21a, a timer 21b, and a storage unit 21c. The mode switching unit 21a switches the operation mode. The timer 21b counts a set time.

[0038] The storage unit 21c stores setting information related to the operation of the ventilator with temperature control function, including information related to the operation method in the normal operation mode, information related to the operation method in the leak detection mode, output setting values, setting times, etc.

[0039] Air blowing control unit 22 controls air supply motor 12a and exhaust motor 13a. Air blowing output estimating unit 23 estimates the air blowing output of air supply fan 12 based on a signal corresponding to the rotation speed of air supply motor 12a. Air blowing output estimating unit 23 also estimates the air blowing output of exhaust fan 13 based on a signal corresponding to the rotation speed of exhaust motor 13a.

[0040] The coil control unit 24 controls the temperature adjustment coil 15. The leakage determination unit 25 determines, based on a signal from the refrigerant sensor 16, whether or not there is a refrigerant leak.

[0041] The communication unit 26 communicates with the remote controller 18. The setting correction unit 27 corrects the setting information stored in the memory unit 21c based on instructions from the remote controller 18. In other words, the various settings stored in the memory unit 21c can be changed by operating the remote controller 18.

[0042] Fig. 3 is a flowchart showing the operation of the control device 17 of Fig. 2. When the operation of the ventilator with temperature control function is started, the control device 17 sets the operation mode to the normal operation mode in step S101.

[0043] Next, in step S102, the control device 17 determines whether the air supply fan 12 is in operation. If the air supply fan 12 is not in operation, the control device 17 maintains the setting of the normal operation mode.

[0044] If air supply fan 12 is in operation, in step S103, control device 17 estimates the air blowing output of air supply fan 12 and also estimates the air blowing output of exhaust fan 13. Then, in step S104, control device 17 determines whether the air blowing output of either air supply fan 12 or exhaust fan 13 is equal to or less than the output set value.

[0045] If the air blowing output is not equal to or less than the output set value, the control device 17 returns to the process of step S101 and maintains the normal operation mode.

[0046] If the air blowing output is equal to or less than the output setting value, the control device 17 switches the operation mode to the leak detection mode in step S105, and then starts counting by the timer in step S106.

[0047] Thereafter, in step S107, the control device 17 determines whether or not refrigerant has been detected by the refrigerant sensor 16. If refrigerant has not been detected, the control device 17 determines whether or not a set time has elapsed in step S108. If the set time has not elapsed, the control device 17 returns to the processing of step S107.

[0048] If the set time has elapsed without refrigerant being detected, the control device 17 returns to the process of step S101 and changes the operation mode back to the normal operation mode.

[0049] If refrigerant is detected by refrigerant sensor 16 within the set time, control device 17 determines in step S109 that a refrigerant leak has occurred. Although not specifically specified in this disclosure, the product operates in accordance with safety standards when a refrigerant leak has been determined.

[0050] In such a ventilation system with a temperature control function, when the air output of the designated blower falls below the output setting value, the operation mode is switched from the normal operation mode to the leak detection mode, and the air supply blower 12 stops blowing air.

[0051] This prevents outside air from flowing into the air supply passage 11e, improving the accuracy of detecting refrigerant leakage from the temperature control coil 15. Furthermore, operation in the leakage detection mode is performed when the air output of the designated blower falls below the output setting value, so the timing at which the leakage detection mode is performed is limited.

[0052] Therefore, it is possible to more reliably detect refrigerant leakage while suppressing instability in the indoor temperature environment, and therefore, if a refrigerant leakage occurs, it is possible to take measures more quickly.

[0053] Furthermore, compared to installing another refrigerant sensor indoors or using multiple refrigerant sensors, the configuration is less complicated and workability is less likely to be compromised.

[0054] Furthermore, if the refrigerant sensor 16 does not detect any refrigerant within a set time after switching the operation mode to the leak detection mode, the operation mode is returned to the normal operation mode. This makes it possible to more reliably prevent the indoor temperature environment from becoming unstable.

[0055] Furthermore, the control device 17 estimates the air blowing output of the air supply motor 12a based on the rotation speed of the air supply motor 12a. The control device 17 also estimates the air blowing output of the exhaust motor 13a based on the rotation speed of the exhaust motor 13a. Therefore, the air blowing output of the designated blower can be estimated without using an additional sensor.

[0056] The output setting value can be set from the remote controller 18. Therefore, the output setting value can be easily changed depending on the installation environment of the ventilator with temperature control function.

[0057] Furthermore, the air output of exhaust fan 13 in the leak detection mode can be set from remote controller 18. Therefore, the air output of exhaust fan 13 in the leak detection mode can be easily changed depending on the installation environment of the ventilation device with temperature control function.

[0058] Embodiment 2 4 is a schematic diagram showing a ventilation system with a temperature control function according to embodiment 2. Supply air outlet 11b is provided with supply air volume detection device 31. Supply air volume detection device 31 detects the actual volume of air blown by supply air blower 12.

[0059] The exhaust air outlet 11d is provided with an exhaust air volume detection device 32. The exhaust air volume detection device 32 detects the actual volume of air blown by the exhaust fan 13.

[0060] The control device 17 uses information from the supply air volume detection device 31 and information from the exhaust air volume detection device 32 as the air output of the designated fan.

[0061] Each of the intake air volume detection device 31 and the exhaust air volume detection device 32 may be a sensor that directly detects the volume of air passing through, or a sensor that indirectly detects the volume of air from a differential pressure, etc. The installation location of the intake air volume detection device 31 and the exhaust air volume detection device 32 is not limited to the casing 11, but may also be inside a duct of a building, an intake grill, etc.

[0062] Fig. 5 is a block diagram showing a control system of the ventilation device with temperature adjustment function of Fig. 4. Control device 17 of embodiment 2 has information acquisition unit 28 instead of blowing output estimation unit 23 of embodiment 1. Information acquisition unit 28 acquires information from supply air flow rate detection device 31 and information from exhaust air flow rate detection device 32.

[0063] Another exhaust fan 41 in the same ventilation system is connected to the control device 17 via a communication network. The other exhaust fan 41 is a fan that exhausts the same indoor air as the exhaust fan 13 to the outside. The ventilation system of the second embodiment includes a ventilation device with a temperature control function and the other exhaust fan 41.

[0064] In the leak detection mode, the control device 17 stops the air blowing by the exhaust fan 13 and also stops the other exhaust fans 41.

[0065] Furthermore, when the operation mode is switched to the leak detection mode, the control device 17 can be set to continue the leak detection mode until a refrigerant is detected by the refrigerant sensor 16. When the continuation of the leak detection mode is set, the control device 17 continues the leak detection mode after switching the operation mode to the leak detection mode until a refrigerant leak is detected.

[0066] The duration of the leak detection mode can be set or changed from the remote controller 18.

[0067] Fig. 6 is a flowchart showing the operation of the control device 17 of Fig. 5. The processes of steps S101, S102, S104, and S105 are the same as those in Fig. 3.

[0068] If it is determined in step S102 that the air supply fan 12 is in operation, the control device 17 acquires information from the air supply volume detection device 31 and the exhaust volume detection device 32 in step S201.

[0069] After switching the operation mode to the leak detection mode in step S105, the control device 17 determines in step S202 whether the exhaust fan 13 is set to operate.

[0070] If the exhaust fan 13 is operating, the control device 17 proceeds to the process of step S106. If the exhaust fan 13 is not operating, that is, if the operating state of the exhaust fan 13 in the leak detection mode is set to stopped, the control device 17 stops the other exhaust fans 41 in the same system in step S203, and proceeds to the process of step S106.

[0071] The processes in steps S106, S107, S108, and S109 are the same as those in FIG.

[0072] In step S108, if the set time has elapsed without refrigerant being detected, the control device 17 determines in step S204 whether continuation of the leak detection mode is set. If continuation of the leak detection mode is not set, the control device 17 returns to the processing of step S101.

[0073] If continuation of the leak detection mode is set, the control device 17 continues the leak detection mode in step S205. After continuing the leak detection mode, if the control device 17 receives a command from the remote controller 18 to return to the normal operation mode, the control device 17 switches the operation mode to the normal operation mode.

[0074] Other configurations and operations in the second embodiment are the same as those in the first embodiment.

[0075] With this type of ventilation device with a temperature control function, the same effects as those of the first embodiment can be obtained.

[0076] Furthermore, when the operation mode is switched to the leak detection mode, the control device 17 can be set to continue the leak detection mode until the refrigerant is detected by the refrigerant sensor 16. This makes it possible to more reliably detect refrigerant leaks.

[0077] In the leakage detection mode, the control device 17 stops the air blowing by the exhaust fan 13 and also stops the other exhaust fans 41. This more reliably prevents outside air from flowing into the air supply passage 11e, improving the accuracy of refrigerant detection.

[0078] In the first and second embodiments, only one of the intake fan 12 and the exhaust fan 13 may be designated as the designated fan.

[0079] In the first and second embodiments, which of the intake air blower 12 and the exhaust air blower 13 is designated as the designated blower may be changeable from the remote controller 18 as setting information.

[0080] Each function of the control device 17 in the first and second embodiments is realized by a processing circuit. Fig. 7 is a configuration diagram showing a first example of a processing circuit that realizes each function of the control device 17 in the first and second embodiments. The processing circuit 100 in the first example is dedicated hardware.

[0081] The processing circuit 100 may be, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof. Each function of the control device 17 may be realized by a separate processing circuit 100, or all functions may be realized by the processing circuit 100.

[0082] 8 is a configuration diagram showing a second example of a processing circuit that realizes each function of the control device 17 according to the first and second embodiments. The processing circuit 200 of the second example includes a processor 201 and a memory 202.

[0083] The processor 201 may be, for example, a central processing unit (CPU), a graphics processing unit (GPU), a microprocessor, a microcontroller, or a digital signal processor (DSP).

[0084] In the processing circuit 200, each function of the control device 17 is realized by software, firmware, or a combination of software and firmware. The software and firmware are written as programs and stored in the memory 202. The processor 201 realizes each function by reading and executing the programs stored in the memory 202.

[0085] It can also be said that the programs stored in memory 202 cause the computer to execute the procedures or methods of the above-mentioned sections. Here, memory 202 refers to non-volatile or volatile semiconductor memory, such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), and EEPROM (Electrically Erasable and Programmable Read Only Memory). Magnetic disks, flexible disks, optical disks, compact disks, minidisks, DVDs, and the like also fall under memory 202.

[0086] It should be noted that some of the functions of the above-described units may be realized by dedicated hardware, and other parts may be realized by software or firmware.

[0087] In this way, the processing circuit can realize the functions of each of the above-mentioned units by hardware, software, firmware, or a combination of these.

[0088] Although the preferred embodiments have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims.

[0089] Various aspects of the present disclosure are summarized below as appendices.

[0090] (Appendix 1) a casing in which an air supply passageway, which is a passageway for air from the outside to the inside of the room, and an air exhaust passageway, which is a passageway for air from the inside of the room to the outside of the room, are formed; an air supply blower provided in the air supply passage; an exhaust fan provided in the exhaust passage; a heat exchanger provided in the casing for exchanging heat between air passing through the intake passage and air passing through the exhaust passage; a temperature adjustment coil for adjusting the temperature of air passing through the air supply passage; a refrigerant sensor for detecting a refrigerant contained in air passing through the air supply passage; and A control device for controlling the air supply fan, the air exhaust fan, and the temperature adjustment coil Equipped with operation modes of the air supply fan and the exhaust fan controlled by the control device include a normal operation mode in which the air supply fan and the exhaust fan are operated to perform ventilation, and a leakage detection mode in which the air supply fan is stopped from blowing air and the refrigerant sensor detects refrigerant contained in the air passing through the air supply passage, The control device is a ventilation device with a temperature control function that switches the operating mode from the normal operating mode to the leak detection mode when the air output of a designated blower, which is at least one of the air supply blower and the exhaust blower, falls below an output set value. (Appendix 2) 2. The ventilation device with temperature control function according to claim 1, wherein the control device returns the operation mode to the normal operation mode when the refrigerant is not detected by the refrigerant sensor within a set time after switching the operation mode to the leak detection mode. (Appendix 3) 2. The ventilation device with temperature control function described in claim 1, wherein the control device can be configured to continue the leak detection mode when the operating mode is switched to the leak detection mode until the refrigerant is detected by the refrigerant sensor. (Appendix 4) A remote controller capable of communicating with the control device Furthermore, The ventilation device with temperature control function described in any one of Appendix 1 to Appendix 3, wherein at least one of the output setting value and the air output of the exhaust fan in the leak detection mode can be set from the remote controller. (Appendix 5) 5. The ventilation device with temperature control function according to any one of claims 1 to 4, wherein the control device sets the air output of the exhaust fan to a maximum output in the leak detection mode. (Appendix 6) 6. The ventilation device with temperature control function according to any one of claims 1 to 5, wherein the control device estimates the air output of the designated fan based on the rotation speed of the motor of the designated fan. (Appendix 7) A ventilation device with temperature control function described in any one of Appendix 1 to Appendix 5, wherein the control device uses information from an air volume detection device that detects the actual air volume of the designated blower as the air output of the designated blower. (Appendix 8) A ventilation system including another exhaust fan that is provided outside and exhausts the air in the room to the outside of the room, and the ventilation device with temperature control function according to any one of Supplementary Note 1 to Supplementary Note 4, In the leak detection mode, the control device stops the exhaust fan and also stops the other exhaust fans. [Explanation of symbols]

[0091] 11 casing, 11e intake passage, 11f exhaust passage, 12 intake air blower (designated blower), 12a intake air motor, 13 exhaust air blower (designated blower), 13a exhaust air motor, 14 total heat exchanger, 15 temperature control coil, 16 refrigerant sensor, 17 control device, 18 remote controller, 41 other exhaust air blower.

Claims

1. a casing in which an air supply passageway, which is a passageway for air from the outside to the inside of the room, and an air exhaust passageway, which is a passageway for air from the inside of the room to the outside of the room, are formed; an air supply blower provided in the air supply passage; an exhaust fan provided in the exhaust passage; a heat exchanger provided in the casing for exchanging heat between air passing through the intake passage and air passing through the exhaust passage; a temperature adjustment coil for adjusting the temperature of air passing through the air supply passage; a refrigerant sensor for detecting a refrigerant contained in air passing through the air supply passage; and A control device for controlling the air supply fan, the air exhaust fan, and the temperature adjustment coil Equipped with operation modes of the air supply fan and the exhaust fan controlled by the control device include a normal operation mode in which the air supply fan and the exhaust fan are operated to perform ventilation, and a leakage detection mode in which air blowing by the air supply fan is stopped and the refrigerant sensor detects refrigerant contained in the air passing through the air supply passage, The control device is a ventilation device with a temperature control function that switches the operating mode from the normal operating mode to the leak detection mode when the air output of a designated blower, which is at least one of the air supply blower and the exhaust blower, falls below an output set value.

2. 2. The ventilation device with temperature control function according to claim 1, wherein the control device returns the operation mode to the normal operation mode when the refrigerant is not detected by the refrigerant sensor within a set time after switching the operation mode to the leak detection mode.

3. The ventilation device with temperature control function according to claim 1 , wherein the control device can be configured to, when the operation mode is switched to the leak detection mode, continue the leak detection mode until the refrigerant is detected by the refrigerant sensor.

4. A remote controller capable of communicating with the control device Furthermore, 4. The ventilation device with temperature control function according to claim 1, wherein at least one of the output setting value and the air output of the exhaust fan in the leak detection mode can be set from the remote controller.

5. 4. The ventilation system with temperature control function according to claim 1, wherein the control device sets the air output of the exhaust fan to a maximum output in the leak detection mode.

6. The ventilation device with temperature control function according to any one of claims 1 to 3, wherein the control device estimates an air output by the designated fan based on a rotation speed of an electric motor of the designated fan.

7. 4. The ventilation device with temperature control function according to claim 1, wherein the control device uses information from an air volume detection device that detects the actual air volume of the designated fan as the air output of the designated fan.

8. A ventilation system including: another exhaust fan that is provided outside and exhausts the air in the room to the outside of the room; and the ventilation device with temperature control function according to any one of claims 1 to 3, In the leak detection mode, the control device stops the exhaust fan and also stops the other exhaust fans.

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