Heat exchange ventilation system

Abstract

Provided is a heat exchange ventilation system (50) comprising a heat exchange ventilation device (1) that performs heat exchange ventilation of a space to be ventilated, a non-heat-exchange ventilation device (13) that discharges air in the space to be ventilated to the outside of the room, and a ventilation necessity degree detection unit that detects a ventilation necessity degree index indicating a ventilation necessity degree of the space to be ventilated, one of the heat exchange ventilation device (1) and the non-heat-exchange ventilation device (13) being operated when the ventilation necessity degree index of the space to be ventilated is equal to or less than a preset threshold value, and both of the heat exchange ventilation device (1) and the non-heat-exchange ventilation device (13) being operated when the ventilation necessity degree index of the space to be ventilated is larger than the threshold value.

Description

Heat exchange ventilation system

[0001] The present disclosure relates to a heat exchange ventilation system including a heat exchange ventilation device that performs heat exchange ventilation and a non-heat exchange ventilation device that performs non-heat exchange ventilation.

[0002] The Building Standards Act of Japan requires that the ventilation volume per person in a room in a house be 20 m ３ / h or more, but as a measure against viral infections, the ventilation volume per person is set at 30 m ３ / h. For this reason, there has been an increase in cases where a heat exchange ventilation system is constructed by retrofitting a heat exchange ventilator in a room where a non-heat exchange device is already installed, or by retrofitting a non-heat exchange ventilator in a room where a heat exchange ventilator is already installed. In other words, attempts have been made to increase the ventilation volume while utilizing existing devices by constructing a heat exchange ventilation system by combining a heat exchange ventilator and a non-heat exchange ventilator.

[0003] In heat exchange ventilation, which involves exchanging heat between intake and exhaust air while ventilating, excessive ventilation can increase the air conditioning load, which is the amount of heat that must be transferred to and from the air to maintain a certain temperature and humidity level in a room, and the ventilation load, which is the amount of heat that must be transferred to and from the outside air brought into the room to maintain that temperature and humidity level. Therefore, heat exchange ventilation systems must adjust the ventilation volume of the entire system to match the actual ventilation volume required to prevent excessive air conditioning and ventilation loads. In addition to indoor carbon dioxide concentration, other ventilation necessity indices, which indicate the need for ventilation, include the occupancy rate, which indicates the ratio of the number of people in a room to its capacity.

[0004] The blower disclosed in Patent Document 1 controls the motor that drives the impeller based on the carbon dioxide concentration measurement results input from the carbon dioxide concentration sensor, thereby preventing excessive air conditioning load and ventilation load.

[0005] JP 2013-87704 A

[0006] The blower disclosed in Patent Document 1 has the effect of reducing ventilation load and air conditioning load when operated alone, but when used in conjunction with an existing non-heat exchange ventilation device to create a heat exchange ventilation system, operating the heat exchange ventilation device and the non-heat exchange ventilation device simultaneously will result in excessive ventilation in the entire heat exchange ventilation system, resulting in high ventilation load and air conditioning load.

[0007] The present disclosure has been made in consideration of the above, and aims to provide a heat exchange ventilation system that suppresses an increase in the ventilation load and air conditioning load in heat exchange ventilation throughout the entire system.

[0008] In order to solve the above-mentioned problems and achieve the object, a heat exchange ventilation system according to the present disclosure includes a heat exchange ventilator that performs heat exchange ventilation of a space to be ventilated, a non-heat exchange ventilator that exhausts air from the space to be ventilated to the outside, and a ventilation necessity detection unit that detects a ventilation necessity index that indicates the ventilation necessity index of the space to be ventilated. The heat exchange ventilation system operates one of the heat exchange ventilator and the non-heat exchange ventilator if the ventilation necessity index of the space to be ventilated is equal to or less than a predetermined threshold, and operates both the heat exchange ventilator and the non-heat exchange ventilator if the ventilation necessity index of the space to be ventilated is greater than the threshold.

[0009] The heat exchange ventilation system according to the present disclosure has the advantage of being able to suppress an increase in the ventilation load and air conditioning load in the heat exchange ventilation of the entire system.

[0010] FIG. 1 shows the configuration of a heat exchange ventilation system according to embodiment 1. FIG. 2 shows a perspective view of a heat exchange ventilation device according to embodiment 1. FIG. 3 shows a flowchart showing the operation flow of a heat exchange ventilation device according to embodiment 1. FIG. 4 shows the configuration of a heat exchange ventilation system according to embodiment 2. FIG. 5 shows the configuration of a heat exchange ventilation system according to embodiment 3. FIG. 6 shows the configuration of a heat exchange ventilation system according to embodiment 4. FIG. 7 shows the configuration of a heat exchange ventilation system according to embodiment 5. FIG. 8 shows the hardware configuration of the control unit of the heat exchange ventilation device and the control unit of the non-heat exchange ventilation device of the heat exchange ventilation systems according to embodiments 1 to 4, and the control unit of the control device of the heat exchange ventilation system according to embodiment 5.

[0011] Hereinafter, a heat exchange ventilation system according to an embodiment will be described in detail with reference to the drawings.

[0012] Embodiment 1. Figure 1 is a diagram showing the configuration of a heat exchange ventilation system according to embodiment 1. The heat exchange ventilation system 50 according to embodiment 1 includes a heat exchange ventilator 1, a non-heat exchange ventilator 13, and a carbon dioxide concentration sensor 14. The carbon dioxide concentration sensor 14 is a ventilation necessity detection unit that detects the carbon dioxide concentration, which is one of the ventilation necessity indices that indicate the degree of necessity of ventilation in a room 17, which is a space to be ventilated. In the example shown in Figure 1, the carbon dioxide concentration sensor 14 is installed inside the room 17, which is a space to be ventilated. Note that the carbon dioxide concentration sensor 14 may be exposed to the wall of the room 17, which is a space to be ventilated, or may be embedded in the wall of the room 17.

[0013] In room 17, which is the space to be ventilated, duct 21 connects air intake 18 provided on the ceiling surface to heat exchange ventilator 1, duct 22 connects air exhaust 191 to heat exchange ventilator 1, and ducts 23 and 24 connect heat exchange ventilator 1 to the outdoors. Duct 25 connects air exhaust 192 provided on the ceiling surface to non-heat exchange ventilator 13, and duct 26 connects the non-heat exchange ventilator to the outdoors. Air inside room 17 drawn in through exhaust 191 is exhausted to the outdoors via heat exchange ventilator 1. Air drawn in from the outdoors is exhausted to the outdoors via non-heat exchange ventilator 13. Air drawn in from the outdoors is supplied to room 17 through air intake 18 via heat exchange ventilator 1.

[0014] Fig. 2 is a perspective view of a heat exchange ventilator according to embodiment 1. The heat exchange ventilator 1 includes an exterior casing 10. The exterior casing 10 is a hexahedral box having a top plate 11, a bottom plate 12, and four side surfaces. Note that Fig. 1 shows a portion of the exterior casing 10 as a transparent view to visualize the interior of the exterior casing 10. An intake air passage 60 and an exhaust air passage 70 are formed inside the exterior casing 10. An intake air blower 6 and an exhaust air blower 7 are also installed inside the exterior casing 10.

[0015] The intake air blower 6 is installed in the intake air ventilation duct 60. The intake air ventilation duct 60 passes air flow from the outside to the inside of the room when the intake air blower 6 is operating. The intake air blower 6 is configured by surrounding an electric motor 61 and a blade member 62 that rotates when driven by the electric motor 61 with an intake air fan casing 63 formed in a spiral shape.

[0016] The exhaust fan 7 is installed in the exhaust ventilation duct 70. The exhaust ventilation duct 70 allows air to flow from the inside of the room to the outside of the room when the exhaust fan 7 is in operation. The exhaust fan 7 is configured by surrounding an electric motor 71, a blade member 72 that rotates when driven by the electric motor 71, and an exhaust fan casing 73 formed in a spiral shape.

[0017] The heat exchange element 8 is located midway through the intake air passage 60 and the exhaust air passage 70 and is stored in the center of the exterior casing 10. The heat exchange element 8 is formed in the shape of a rectangular pillar and is made up of a number of intake air passages each having a multi-layer structure made of corrugated paperboard, known as a corrugated sheet, bonded to flat paperboard, and an exhaust air passage each having a multi-layer structure made of corrugated paperboard bonded to flat paperboard, stacked so that the directions of the intake air passage and the exhaust air passage are perpendicular to each other, and heat is exchanged between the intake air flow passing through the intake air passage and the exhaust air flow passing through the exhaust air passage.

[0018] An outside air inlet 2 and an exhaust outlet 3 are provided on one side of the exterior casing 10. A return air inlet 4 and a supply air outlet 5 are provided on the side of the exterior casing 10 opposite to the side on which the outside air inlet 2 and the exhaust outlet 3 are provided. A control unit 9 that controls the supply air blower 6 and the exhaust air blower 7 is provided on one of the sides of the exterior casing 10 connecting the side on which the outside air inlet 2 and the exhaust outlet 3 are provided and the side on which the return air inlet 4 and the supply air outlet 5 are provided.

[0019] The supply air duct 60 runs from the outside air inlet 2 through the supply air passage of the heat exchange element 8 and the supply air fan casing 63 to the supply air outlet 5. The exhaust air duct 70 runs from the return air inlet 4 through the exhaust air passage of the heat exchange element 8 and the exhaust fan casing 73 to the exhaust air outlet 3. The supply air duct 60 and the exhaust air duct 70 are configured independently of each other within the heat exchange ventilator 1 so that the supply air flow and the exhaust air flow do not mix.

[0020] By operating the exhaust fan 7, return air A in the room is drawn from the return air inlet 4 through the duct 22 into the exhaust ventilation duct 70. The return air A drawn into the exhaust ventilation duct 70 passes through the exhaust passage of the heat exchange element 8, and is then blown out as exhaust air B from the exhaust outlet 3 through the duct 24 to the outside of the room.

[0021] Furthermore, by operating the supply air blower 6, outside air C is drawn from the outside air inlet 2 through the duct 23 into the supply air ventilation duct 60. The outside air C drawn into the supply air ventilation duct 60 passes through the supply air passage of the heat exchange element 8 and is then blown out as supply air D from the supply air outlet 5 through the duct 21 into the room. The heat exchange ventilator 1 recovers exhaust heat through heat exchange between the supply air flow and the exhaust air flow in the heat exchange element 8 and sends it into the room together with the supply air flow. This makes it possible to reduce the heating and cooling load in the room.

[0022] The non-heat exchange ventilation device 13 includes a blower 131 and a control unit 132 that controls the blower 131. By operating the blower 131, return air A from inside the room is drawn into the non-heat exchange ventilation device 13 through a duct 25. The return air A drawn into the non-heat exchange ventilation device 13 is blown out as exhaust air E to the outside of the room through a duct 26.

[0023] FIG. 3 is a flowchart showing the operation of the heat exchanger ventilator according to the first embodiment. In step S1, the carbon dioxide concentration sensor 14 measures the carbon dioxide concentration in the room 17 and outputs the measurement result to the control unit 9 of the heat exchanger ventilator 1 and the control unit 132 of the non-heat exchanger ventilator 13. In step S2, the control unit 9 of the heat exchanger ventilator 1 and the control unit 132 of the non-heat exchanger ventilator 13 determine whether the carbon dioxide concentration in the room 17 is equal to or lower than a preset threshold. If the carbon dioxide concentration in the room 17 is equal to or lower than the preset threshold, the answer in step S2 is Yes. In step S3, the control unit 9 of the heat exchanger ventilator 1 operates the supply air blower 6 and the exhaust air blower 7 to perform heat exchange ventilation. In addition, the control unit 132 of the non-heat exchanger ventilator 13 stops the blower 131. After step S3, the process ends.

[0024] On the other hand, if the carbon dioxide concentration in room 17 is greater than the preset threshold, the answer is No in step S2, and in step S4, the control unit 9 of the heat exchange ventilator 1 operates the supply air blower 6 and the exhaust air blower 7 to perform heat exchange ventilation. Also, the control unit 132 of the non-heat exchange ventilator 13 operates the blower 131 to perform non-heat exchange ventilation. After step S4, the process ends.

[0025] As described above, in the heat exchange ventilation system 50 according to the first embodiment, the heat exchange ventilator 1 and the non-heat exchange ventilator 13 operate based on the carbon dioxide concentration in the room 17 notified by the carbon dioxide concentration sensor 14. For example, if a carbon dioxide concentration of 1000 ppm is preset as the threshold, both the heat exchange ventilator 1 and the non-heat exchange ventilator 13 operate if the measurement result by the carbon dioxide concentration sensor 14 is greater than 1000 ppm, and only the heat exchange ventilator 1 operates if the measurement result by the carbon dioxide concentration sensor 14 is 1000 ppm or less.

[0026] The heat exchange ventilation system 50 of embodiment 1 operates only the heat exchange ventilation device 1 when the carbon dioxide concentration, which is a ventilation necessity index indicating the necessity of ventilation inside the room 17, is below a predetermined threshold, thereby preventing excessive ventilation volume and an increase in air conditioning load and ventilation load.

[0027] Embodiment 2. Figure 4 is a diagram showing the configuration of a heat exchange ventilation system according to embodiment 2. A heat exchange ventilation system 50 according to embodiment 2 has a temperature sensor 16 that measures the outdoor temperature. The temperature sensor 16 is installed in a duct 23 that connects from an outdoor air outlet to the heat exchange ventilation device 1. A carbon dioxide concentration sensor 14 is installed in a duct 22 that connects from an indoor exhaust port 191 of a room 17 to the heat exchange ventilation device 1. The remaining configuration is the same as that of embodiment 1.

[0028] 5 is a flowchart showing the operation flow of the heat exchange ventilation system according to embodiment 2. The processes of steps S11, S12, and S14 are the same as the processes of steps S1, S2, and S4 in the heat exchange ventilation system 50 according to embodiment 1. If the carbon dioxide concentration, which is a ventilation necessity index indicating the necessity of ventilation in room 17, is equal to or lower than a preset threshold, the answer in step S12 is Yes, and in step S13, the temperature sensor 16 measures the outdoor temperature.

[0029] In step S15, the control unit 9 of the heat exchange ventilation device 1 and the control unit 132 of the non-heat exchange ventilation device 13 determine whether the outdoor temperature is equal to or higher than a preset lower limit temperature and equal to or lower than a preset upper limit temperature.

[0030] If the outdoor temperature is equal to or higher than a preset lower limit temperature and equal to or lower than a preset upper limit temperature, the answer in step S15 is Yes, and in step S16, the control unit 9 of the heat exchanger ventilator 1 stops the supply air blower 6 and the exhaust air blower 7. In addition, the control unit 132 of the non-heat exchanger ventilator 13 operates the blower 131. After step S16, the process ends.

[0031] If the outdoor temperature is lower than a preset lower limit temperature or higher than a preset upper limit temperature, the answer in step S15 is No, and in step S17, the control unit 9 of the heat exchanger ventilator 1 operates the supply air blower 6 and the exhaust air blower 7. In addition, the control unit 132 of the non-heat exchanger ventilator 13 stops the blower 131. After step S17, the process ends.

[0032] Thus, in the heat exchange ventilation system 50 according to the second embodiment, the heat exchange ventilator 1 and the non-heat exchange ventilator 13 operate based on the carbon dioxide concentration obtained from the carbon dioxide concentration sensor 14 and the temperature obtained from the temperature sensor 16. For example, if a carbon dioxide concentration of 1000 ppm is preset as the threshold, the lower limit temperature is preset to 17°C, and the upper limit temperature is preset to 24°C, both the heat exchange ventilator 1 and the non-heat exchange ventilator 13 operate if the measurement result from the carbon dioxide concentration sensor 14 is greater than 1000 ppm. Furthermore, if the measurement result from the carbon dioxide concentration sensor 14 is 1000 ppm or less and the measurement result from the temperature sensor 16 is between 17°C and 24°C, only the non-heat exchange ventilator 13 operates. Furthermore, if the measurement result from the carbon dioxide concentration sensor 14 is 1000 ppm or less and the measurement result from the temperature sensor 16 is less than 17°C or greater than 24°C, only the heat exchange ventilator 1 operates.

[0033] The heat exchange ventilation system 50 of embodiment 2 operates only one of the heat exchange ventilation device 1 or the non-heat exchange ventilation device 13 when the carbon dioxide concentration in the room 17 is below a predetermined threshold, thereby preventing excessive ventilation volume and an increase in air conditioning load and ventilation load.

[0034] Embodiment 3. Fig. 6 is a diagram showing the configuration of a heat exchange ventilation system according to embodiment 3. The heat exchange ventilation system 50 according to embodiment 3 does not include a carbon dioxide concentration sensor 14, but instead includes a human presence sensor 15. The rest of the configuration is the same as the heat exchange ventilation system 50 according to embodiment 1.

[0035] 6 , the human presence sensor 15 is installed inside the room 17. The human presence sensor 15 detects the number of people present in the room 17, which is a space to be ventilated. The human presence sensor 15 may be exposed to the wall of the room 17, which is a space to be ventilated, or may be embedded in the wall of the room 17.

[0036] The control unit 9 of the heat exchange ventilator 1 and the control unit 132 of the non-heat exchange ventilator 13 calculate the occupancy rate of the room 17 based on the number of people present in the room detected by the human presence sensor 15. The occupancy rate is the ratio of the number of people present in the room to the capacity of the room 17; if the capacity of the room 17 is three people and the number of people present in the room is two, the occupancy rate is 66.7%. The occupancy rate is a ventilation necessity index that indicates the degree of necessity for ventilation of the room 17. Therefore, in the third embodiment, the control units 9, 132 and the human presence sensor 15 constitute a ventilation necessity detection unit that detects the occupancy rate, which is one of the ventilation necessity indices.

[0037] 7 is a flowchart showing the operation flow of the heat exchange ventilation system according to embodiment 3. In step S21, the human presence sensor 15 detects the number of people in the room 17 and outputs the detection result of the number of people to the control unit 9 of the heat exchange ventilation device 1 and the control unit 132 of the non-heat exchange ventilation device 13.

[0038] In step S22 , the control unit 9 of the heat exchange ventilation device 1 and the control unit 132 of the non-heat exchange ventilation device 13 calculate the occupancy rate of the room 17 .

[0039] In step S23, the control unit 9 of the heat exchanger ventilator 1 and the control unit 132 of the non-heat exchanger ventilator 13 determine whether the occupancy rate in room 17 is equal to or lower than a preset threshold. If the occupancy rate in room 17 is equal to or lower than the preset threshold, the answer is Yes in step S23, and in step S24, the control unit 9 of the heat exchanger ventilator 1 operates the supply air blower 6 and the exhaust air blower 7 to perform heat exchange ventilation. In addition, the control unit 132 of the non-heat exchanger ventilator 13 stops the blower 131. After step S24, the process ends.

[0040] On the other hand, if the occupancy rate in room 17 is greater than the preset threshold, step S23 returns No, and in step S25, the control unit 9 of the heat exchanger ventilator 1 operates the supply air blower 6 and the exhaust air blower 7 to perform heat exchange ventilation. Also, the control unit 132 of the non-heat exchanger ventilator 13 operates the blower 131 to perform non-heat exchange ventilation. After step S25, the process ends.

[0041] As described above, in the heat exchange ventilation system 50 according to the third embodiment, the heat exchange ventilator 1 and the non-heat exchange ventilator 13 operate based on the occupancy rate calculated based on the number of people present in the room obtained from the human presence sensor 15. For example, if the threshold for the occupancy rate is set to 66% in advance, both the heat exchange ventilator 1 and the non-heat exchange ventilator 13 operate if the occupancy rate in room 17 is higher than 66%, and only the heat exchange ventilator 1 operates if the occupancy rate in room 17 is 66% or lower.

[0042] The heat exchange ventilation system 50 of embodiment 3 operates only the heat exchange ventilation device 1 when the occupancy rate in room 17 is below a predetermined threshold, thereby preventing excessive ventilation volume and an increase in air conditioning load and ventilation load.

[0043] Embodiment 4. Figure 8 is a diagram showing the configuration of a heat exchange ventilation system according to embodiment 4. A heat exchange ventilation system 50 according to embodiment 4 has a temperature sensor 16 that measures the outdoor temperature. The temperature sensor 16 is installed in a duct 23 that connects from an outdoor air outlet to the heat exchange ventilation device 1. The rest of the system is the same as the heat exchange ventilation system 50 according to embodiment 3.

[0044] 9 is a flowchart showing the operation flow of the heat exchange ventilation system according to embodiment 4. The processes of steps S31, S32, S33, and S35 are the same as the processes of steps S21, S22, S23, and S25 in the heat exchange ventilation system 50 according to embodiment 3. If the occupancy rate in room 17 is equal to or lower than a preset threshold, the answer in step S33 is Yes, and in step S34, the temperature sensor 16 measures the outdoor temperature.

[0045] In step S36, the control unit 9 of the heat exchange ventilation device 1 and the control unit 132 of the non-heat exchange ventilation device 13 determine whether the outdoor temperature is equal to or higher than a preset lower limit temperature and equal to or lower than a preset upper limit temperature.

[0046] If the outdoor temperature is equal to or higher than a preset lower limit temperature and equal to or lower than a preset upper limit temperature, the answer in step S36 is Yes, and in step S37, the control unit 9 of the heat exchanger ventilator 1 stops the supply air blower 6 and the exhaust air blower 7. In addition, the control unit 132 of the non-heat exchanger ventilator 13 operates the blower 131. After step S37, the process ends.

[0047] If the outdoor temperature is lower than the preset lower limit temperature or higher than the preset upper limit temperature, the answer in step S36 is No, and in step S38, the control unit 9 of the heat exchanger ventilator 1 operates the supply air blower 6 and the exhaust air blower 7. In addition, the control unit 132 of the non-heat exchanger ventilator 13 stops the blower 131. After step S38, the process ends.

[0048] As described above, in the heat exchange ventilation system 50 according to the fourth embodiment, the heat exchange ventilator 1 and the non-heat exchange ventilator 13 operate based on the occupancy rate calculated based on the number of people present in the room obtained from the human presence sensor 15 and the temperature obtained from the temperature sensor 16. For example, if the occupancy rate threshold is preset to 66%, the lower limit temperature is preset to 17°C, and the upper limit temperature is preset to 24°C, both the heat exchange ventilator 1 and the non-heat exchange ventilator 13 operate when the occupancy rate in the room 17 is higher than 66%. Furthermore, when the occupancy rate in the room 17 is 66% or less and the measurement result of the temperature sensor 16 is between 17°C and 24°C, only the non-heat exchange ventilator 13 operates. Furthermore, when the occupancy rate in the room 17 is 66% or less and the measurement result of the temperature sensor 16 is lower than 17°C or higher than 24°C, only the heat exchange ventilator 1 operates.

[0049] The heat exchange ventilation system 50 of embodiment 4 operates only one of the heat exchange ventilation device 1 or the non-heat exchange ventilation device 13 when the occupancy rate in room 17 is below a predetermined threshold, thereby preventing excessive ventilation volume and an increase in air conditioning load and ventilation load.

[0050] 10 is a diagram showing the configuration of a heat exchange ventilation system according to embodiment 5. A heat exchange ventilation system 50 according to embodiment 5 includes a control device 80. The heat exchange ventilation device 1 and the non-heat exchange ventilation device 13 do not include control units 9, 132, and are controlled by the control device 80.

[0051] The operation of the heat exchange ventilation system 50 according to the fifth embodiment is the same as that of the heat exchange ventilation system 50 according to the first embodiment, except that it is executed by a control unit 81 included in the control device 80 .

[0052] Like the heat exchanger ventilation system 50 according to the first embodiment, the heat exchanger ventilation system 50 according to the fifth embodiment operates only the heat exchanger ventilator 1 when the carbon dioxide concentration, which is a ventilation necessity index indicating the necessity of ventilation in the room 17, is equal to or lower than a preset threshold, thereby preventing excessive ventilation volume and an increase in the air conditioning load and ventilation load. Furthermore, because the control device 80 controls each of the heat exchanger ventilator 1 and the non-heat exchanger ventilator 13, there is no need to set or change the threshold value separately for the heat exchanger ventilator 1 and the non-heat exchanger ventilator 13, thereby reducing the number of work steps.

[0053] Note that, although the description here has been given of the case where the same operation as that of the heat exchange ventilation system 50 according to embodiment 1 is performed, it is also possible to perform the same operation as that of the heat exchange ventilation system 50 according to embodiment 2, embodiment 3 or embodiment 4 using a heat exchange ventilation system 50 equipped with a control device 80.

[0054] The hardware configurations of the control unit 9 of the heat exchange ventilation device 1 and the control unit 132 of the non-heat exchange ventilation device 13 of the heat exchange ventilation system 50 relating to embodiments 1 to 4, and the control unit 81 of the control device 80 of the heat exchange ventilation system 50 relating to embodiment 5 will be described.

[0055] 11 is a diagram showing the hardware configuration of the control unit of the heat exchange ventilator and the control unit of the non-heat exchange ventilator in the heat exchange ventilation systems according to Embodiments 1 to 4, and the control unit of the control device in the heat exchange ventilation system according to Embodiment 5. The control units 9, 81, and 132 are realized by a processor 91 that executes various processes, a memory 92 that is a main memory, and a storage device 93 that stores information.

[0056] The processor 91 may be a computing device such as an arithmetic unit, a microprocessor, a microcomputer, a CPU (Central Processing Unit), or a DSP (Digital Signal Processor). The memory 92 may be a non-volatile or volatile semiconductor memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Programmable Read Only Memory), or an EEPROM (Electrically Erasable Programmable Read Only Memory). A program for executing the capacitor load suppression control process is stored in the storage device 93. The processor 91 reads the program stored in the storage device 93 into the memory 92 and executes it. The processor 91 reads the program stored in the storage device 93 into the memory 92 and executes it, thereby realizing the functions of the control units 9, 81, and 132.

[0057] The configurations shown in the above embodiments are merely examples of the content, and may be combined with other known technologies, or parts of the configurations may be omitted or modified without departing from the spirit of the invention.

[0058] 1 Heat exchange ventilation device, 2 Outdoor air intake port, 3 Exhaust air outlet, 4 Return air intake port, 5 Intake air outlet, 6 Intake air blower, 7 Exhaust air blower, 8 Heat exchange element, 9, 81, 132 Control unit, 10 Exterior casing, 11 Top plate, 12 Bottom plate, 13 Non-heat exchange ventilation device, 14 Carbon dioxide concentration sensor, 15 Human presence sensor, 16 Temperature sensor, 17 Room, 18 Air intake port, 21, 22, 23, 24, 25, 26 Duct, 50 Heat exchange ventilation system, 60 Intake air ventilation duct, 61, 71 Electric motor, 62, 72 Blade member, 63 Intake air fan casing, 70 Exhaust air ventilation duct, 73 Exhaust air fan casing, 80 Control device, 91 Processor, 92 Memory, 93 Storage device, 131 Blower, 191, 192 exhaust port.

Claims

1. A heat exchange ventilation device that performs heat exchange ventilation of a ventilation target space, a non-heat exchange ventilation device that exhausts air in the ventilation target space to the outside, and a ventilation necessity detection unit that detects a ventilation necessity index that indicates the ventilation necessity degree of the ventilation target space; A temperature sensor for measuring a room temperature in the space to be ventilated, If the ventilation necessity index of the ventilation target space is equal to or less than a preset threshold value, one of the heat exchange ventilation device and the non-heat exchange ventilation device is operated, A heat exchange ventilation system characterized in that, when the ventilation necessity index of the space to be ventilated is greater than the threshold value, if the room temperature of the space to be ventilated is greater than or equal to a predetermined lower limit temperature and less than or equal to a predetermined upper limit temperature, the non-heat exchange ventilation device is operated, and if the room temperature of the space to be ventilated is less than the lower limit temperature or higher than the upper limit temperature, the heat exchange ventilation device is operated.

2. 2. The heat exchange ventilation system according to claim 1, wherein the ventilation necessity index is a carbon dioxide concentration in the room of the space to be ventilated.

3. 2. The heat exchange ventilation system according to claim 1, wherein the ventilation necessity index is an occupancy rate, which is a ratio of the number of people present in the space to the capacity of the space to be ventilated.