Heat exchange-type ventilation device

Abstract

In a heat exchange-type ventilation device according to the present invention, a heat exchange device has a first heat exchanger and a second heat exchanger. A supply-side blowing device has a first supply blower and a second supply blower. A discharge-side blowing device has a first exhaust blower and a second exhaust blower. In a normal ventilation mode, a control device controls the supply-side blowing device and the discharge-side blowing device such that the amount of supply-side air and discharge-side air crossing in each of the first and second heat exchangers is less than in a heat exchange ventilation mode.

Description

Heat exchange ventilation system

[0001] The present disclosure relates to a heat exchange type ventilation device.

[0002] In conventional heat exchange ventilation systems, when the air conditioner starts pre-cooling operation and the outdoor temperature is lower than the indoor temperature, normal ventilation operation is initiated, in which at least one of the intake air duct and the exhaust air duct becomes an air duct that bypasses the heat exchanger (see, for example, Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2021-89098

[0004] In conventional heat exchange ventilation systems such as those described above, an air path that bypasses the heat exchanger is formed during normal ventilation operation. This requires an air path that does not pass through the heat exchanger and a mechanism for switching between the air paths, which increases the size of the entire system.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a heat exchange type ventilation device that can prevent the overall size from increasing.

[0006] A heat exchange type ventilation device according to the present disclosure includes a housing having an intake air passage from the outside to the inside of the room and an exhaust air passage from the inside to the outside of the room, a heat exchange device provided in the housing and performing heat exchange between supply-side air which is air flowing through the intake air passage and exhaust-side air which is air flowing through the exhaust air passage, a supply-side blower provided in the intake air passage, an exhaust-side blower provided in the exhaust air passage, and a control device that controls the supply-side blower and the exhaust-side blower in a plurality of operating modes including a heat exchange ventilation mode and a normal ventilation mode, and the heat exchange device has a first heat exchanger and a second heat exchanger arranged in parallel to each other, the supply-side blower has a first intake air blower and a second intake air blower, and the exhaust-side blower has a first exhaust air blower and a second exhaust and a blower, wherein the intake air duct has a first downstream intake air duct provided between the first heat exchanger and the first intake air blower, and a second downstream intake air duct provided between the second heat exchanger and the second intake air blower and independent of the first downstream intake air duct; and the exhaust air duct has a first downstream exhaust air duct provided between the first heat exchanger and the first exhaust air blower, and a second downstream exhaust air duct provided between the second heat exchanger and the second exhaust air blower and independent of the first downstream exhaust air duct, and the control device controls the first intake air blower, the second intake air blower, the first exhaust air blower, and the second exhaust air blower in the normal ventilation mode so that the amount of intersection between the supply-side air and the exhaust-side air in each of the first and second heat exchangers is reduced compared to in the heat exchange ventilation mode.

[0007] According to the heat exchange type ventilation device of the present disclosure, it is possible to prevent the overall size from increasing.

[0008] 1. A perspective view showing the appearance of a heat exchanger-type ventilation device according to embodiment 1. FIG. 1 is a plan view showing the heat exchanger-type ventilation device of FIG. 1. FIG. 2 is a side view of the heat exchanger-type ventilation device of FIG. 2, as viewed along arrow III. FIG. 3 is a side view of the heat exchanger-type ventilation device of FIG. 2, as viewed along arrow VI. FIG. 4 is a perspective view showing internal equipment housed in the housing of FIG. 1. FIG. 5 is a side view showing the internal equipment of FIG. 5. FIG. 6 is a plan view showing the supply air duct in the heat exchanger-type ventilation device of FIG. 5. FIG. 7 is a plan view showing the exhaust air duct in the heat exchanger-type ventilation device of FIG. 5. FIG. 8 is a cross-sectional view showing the flows of supply-side air and exhaust-side air in the heat exchanger of FIG. 5. FIG. 9 is a plan view showing the flows of supply-side air and exhaust-side air in the normal ventilation mode of embodiment 1. FIG. 10 is a block diagram showing a control system of the heat exchanger-type ventilation device according to embodiment 1. FIG. 11 is a flowchart showing the operation mode selection process by the control device of FIG. 11. FIG. 12 is a perspective view showing internal equipment of a heat exchanger-type ventilation device according to embodiment 2. FIG. 13 is a side view showing the internal equipment of FIG. 13. FIG. 14 is a plan view showing the supply air duct in the heat exchanger-type ventilation device of FIG. 13. FIG. 15 is a plan view showing the exhaust air duct in the heat exchanger-type ventilation device of FIG. 13. 19 is a cross-sectional view showing the flow of supply-side air and discharge-side air in the heat exchanger device of FIG. 13. FIG. 20 is a plan view showing the flow of supply-side air and the flow of discharge-side air in a normal ventilation mode of embodiment 2. FIG. 21 is a perspective view showing a main part of a heat exchange type ventilation device according to embodiment 4. FIG. 22 is a perspective view showing a state in which the shutter of FIG. 19 has performed a closing operation. FIG. 23 is a configuration diagram showing a first example of a processing circuit that realizes each function of the control device according to embodiments 1 to 5. FIG. 24 is a configuration diagram showing a second example of a processing circuit that realizes each function of the control device according to embodiments 1 to 5.

[0009] Hereinafter, embodiments will be described with reference to the drawings. Embodiment 1. Fig. 1 is a perspective view showing the appearance of a heat exchanger type ventilation device according to embodiment 1. Fig. 2 is a plan view showing the heat exchanger type ventilation device of Fig. 1. Fig. 3 is a side view of the heat exchanger type ventilation device of Fig. 2 as seen along arrow III. Fig. 4 is a side view of the heat exchanger type ventilation device of Fig. 2 as seen along arrow VI.

[0010] The heat exchange type ventilation device includes a housing 10. The housing 10 has an external shape that is, for example, a rectangular parallelepiped. The housing 10 is arranged facing both the indoor and outdoor sides. The indoor side is the internal space of the room to be ventilated. The outdoor side is the external space of the room to be ventilated, such as the outdoors, another room adjacent to the room to be ventilated, a hallway, or the like.

[0011] Of the four sides of the housing 10, an indoor air inlet 10a, a first indoor air supply vent 10b, and a second indoor air supply vent 10c are provided on the side facing the room. Of the four sides of the housing 10, an outdoor air inlet 10d, a first outdoor exhaust vent 10e, and a second outdoor exhaust vent 10f are provided on the side facing the outside.

[0012] Fig. 5 is a perspective view showing the internal equipment housed in the housing 10 of Fig. 1. Fig. 6 is a side view showing the internal equipment of Fig. 5.

[0013] In addition to the housing 10, the heat exchange type ventilation system further includes, as internal equipment, a heat exchange device 20, a supply side blower 30, a discharge side blower 40, a control device 50, an outdoor temperature sensor 61, and an indoor temperature sensor 62.

[0014] Inside the housing 10, an air supply passage 11 as shown by the arrow in FIG. 7 and an air exhaust passage 12 as shown by the arrow in FIG. 8 are provided.

[0015] The supply air duct 11 is an air duct that connects the outdoor air inlet 10d with the first indoor air supply port 10b and the second indoor air supply port 10c. That is, the supply air duct 11 is a flow path for air from the outdoors to the indoors. Air taken in from the outdoors through the outdoor air inlet 10d passes through the supply air duct 11 and is supplied into the indoors through the first indoor air supply port 10b and the second indoor air supply port 10c.

[0016] The exhaust air duct 12 is an air duct that connects the indoor air inlet 10a with the first outdoor air outlet 10e and the second outdoor air outlet 10f. That is, the exhaust air duct 12 is an air flow path from the indoors to the outdoors. Air taken in from the indoors through the indoor air inlet 10a passes through the exhaust air duct 12 and is exhausted to the outdoors through the first outdoor air outlet 10e and the second outdoor air outlet 10f.

[0017] The heat exchanger 20 is provided inside the housing 10. The heat exchanger 20 exchanges heat between the supply-side air and the exhaust-side air. The supply-side air is air flowing through the supply air duct 11. The exhaust-side air is air flowing through the exhaust air duct 12.

[0018] The heat exchange device 20 also includes a first heat exchanger 21 and a second heat exchanger 22. The first heat exchanger 21 and the second heat exchanger 22 are arranged in parallel with each other midway along the intake air duct 11 and the exhaust air duct 12.

[0019] The supply-side blower 30 is provided in the supply air duct 11. The supply-side blower 30 has a first supply air blower 31 and a second supply air blower 32. The first supply air blower 31 sends supply-side air into the room from the first indoor air supply port 10b. The second supply air blower 32 sends supply-side air into the room from the second indoor air supply port 10c.

[0020] The supply air duct 11 is branched into a plurality of air ducts in the heat exchanger 20. That is, as shown in Fig. 7, the supply air duct 11 has an upstream supply air duct 11a, a first downstream supply air duct 11b, and a second downstream supply air duct 11c.

[0021] The upstream air supply passage 11a is an air passage located upstream of the heat exchanger 20. The first downstream air supply passage 11b is an air passage provided between the first heat exchanger 21 and the first air supply blower 31. The second downstream air supply passage 11c is an air passage provided independently of the first downstream air supply passage 11b, between the second heat exchanger 22 and the second air supply blower 32. An air supply passage partition wall 13 is provided between the first downstream air supply passage 11b and the second downstream air supply passage 11c.

[0022] The exhaust-side blower 40 is provided in the exhaust air passage 12. The exhaust-side blower 40 has a first exhaust fan 41 and a second exhaust fan 42. The first exhaust fan 41 discharges the exhaust-side air to the outside through the first outdoor exhaust port 10e. The second exhaust fan 42 discharges the exhaust-side air to the outside through the second outdoor exhaust port 10f.

[0023] The exhaust air duct 12 is branched into a plurality of air ducts in the heat exchanger 20. That is, as shown in Fig. 8, the exhaust air duct 12 has an upstream exhaust duct 12a, a first downstream exhaust duct 12b, and a second downstream exhaust duct 12c.

[0024] The upstream exhaust path 12a is an air path located upstream of the heat exchanger 20. The first downstream exhaust path 12b is an air path provided between the first heat exchanger 21 and the first exhaust fan 41. The second downstream exhaust path 12c is an air path provided independently of the first downstream exhaust path 12b between the second heat exchanger 22 and the second exhaust fan 42. An exhaust path partition wall 14 is provided between the first downstream exhaust path 12b and the second downstream exhaust path 12c.

[0025] Fig. 9 is a cross-sectional view showing the flow of supply-side air and discharge-side air in the heat exchanger 20 of Fig. 5. The first heat exchanger 21 is provided with a first air intake passage 21a and a first exhaust passage 21b, which are independent of each other. The second heat exchanger 22 is provided with a second air intake passage 22a and a second exhaust passage 22b, which are independent of each other.

[0026] The first air supply passage 21a is a part of the first downstream air supply passage 11b. The second air supply passage 22a is a part of the second downstream air supply passage 11c. The first exhaust passage 21b is a part of the first downstream exhaust passage 12b. The second exhaust passage 22b is a part of the second downstream exhaust passage 12c.

[0027] The first heat exchanger 21 has a first air supply inlet 21aa, a first air supply outlet 21ab, a first exhaust inlet 21ba, and a first exhaust outlet 21bb. The first air supply inlet 21aa is the inlet of the first air supply flow path 21a. The first air supply outlet 21ab is the outlet of the first air supply flow path 21a. The first exhaust inlet 21ba is the inlet of the first exhaust flow path 21b. The first exhaust outlet 21bb is the outlet of the first exhaust flow path 21b.

[0028] The second heat exchanger 22 has a second air supply inlet 22aa, a second air supply outlet 22ab, a second exhaust inlet 22ba, and a second exhaust outlet 22bb. The second air supply inlet 22aa is the inlet of the second air supply flow path 22a. The second air supply outlet 22ab is the outlet of the second air supply flow path 22a. The second exhaust inlet 22ba is the inlet of the second exhaust flow path 22b. The second exhaust outlet 22bb is the outlet of the second exhaust flow path 22b.

[0029] The first air supply inlet 21aa and the second air supply inlet 22aa are connected in parallel to the upstream air supply passage 11a. The first exhaust gas inlet 21ba and the second exhaust gas inlet 22ba are connected in parallel to the upstream exhaust passage 12a.

[0030] The outdoor temperature sensor 61 is provided in the supply air duct 11 between the outdoor air inlet 10d and the heat exchange device 20. The outdoor temperature sensor 61 detects the temperature of the supply-side air taken in through the outdoor air inlet 10d.

[0031] The indoor temperature sensor 62 is provided in the exhaust air duct 12 between the indoor air inlet 10a and the heat exchange device 20. The indoor temperature sensor 62 detects the temperature of the exhaust air taken in through the indoor air inlet 10a.

[0032] The control device 50 is provided in the housing 10. The control device 50 controls the supply-side blower 30 and the discharge-side blower 40 in a plurality of operation modes, which include a heat exchange ventilation mode and a normal ventilation mode.

[0033] The heat exchange ventilation mode is an operating mode in which heat exchange between the exhaust-side air and the supply-side air is actively performed by the heat exchange device 20. The normal ventilation mode is an operating mode in which heat exchange by the heat exchange device 20 is not performed, or the heat exchange rate in the heat exchange device 20 is reduced compared to the heat exchange ventilation mode.

[0034] The control device 50 switches the operation mode based on a signal from the outdoor temperature sensor 61 and a signal from the indoor temperature sensor 62 .

[0035] An air conditioner (not shown) is installed in the room. When the air conditioner is in cooling operation and the temperature of the discharge air is lower than the temperature of the supply air, the control device 50 sets the operation mode to the heat exchange ventilation mode. Furthermore, when the air conditioner is in heating operation and the temperature of the discharge air is higher than the temperature of the supply air, the control device 50 also sets the operation mode to the heat exchange ventilation mode. This reduces the load on the air conditioner.

[0036] The control device 50 sets the operation mode to normal ventilation mode when the temperature of the discharge air is equal to or higher than the temperature of the supply air during cooling operation of the air conditioner. The control device 50 also sets the operation mode to normal ventilation mode when the temperature of the discharge air is equal to or lower than the temperature of the supply air during heating operation of the air conditioner. This prevents an increase in the load on the air conditioner.

[0037] In the normal ventilation mode, the control device 50 controls the supply-side blower 30 and the discharge-side blower 40 so as to reduce the amount of crossover between the supply-side air and the discharge-side air in each of the first heat exchanger 21 and the second heat exchanger 22, compared to the heat exchange ventilation mode. At this time, the control device 50 individually controls the first supply air blower 31, the second supply air blower 32, the first exhaust air blower 41, and the second exhaust air blower 42.

[0038] Specifically, in the heat exchange ventilation mode, the control device 50 operates all of the first air supply fan 31, the second air supply fan 32, the first exhaust fan 41, and the second exhaust fan 42. Therefore, the supply-side air flows as shown in Fig. 7, and the exhaust-side air flows as shown in Fig. 8, and heat exchange occurs in both the first heat exchanger 21 and the second heat exchanger 22.

[0039] In addition, in the normal ventilation mode, the control device 50 stops the first air supply fan 31 and the second exhaust fan 42, and stops the second air supply fan 32 and the first exhaust fan 41.

[0040] 10 is a plan view showing the flow of supply-side air and the flow of discharge-side air in the normal ventilation mode of Embodiment 1. In the normal ventilation mode, the second supply air blower 32 is stopped, so the supply-side air does not flow into the second downstream air supply passage 11c. Therefore, the supply-side air does not flow into the second heat exchanger 22, but only into the first heat exchanger 21.

[0041] In the normal ventilation mode, the first exhaust fan 41 is stopped, and therefore the exhaust air does not flow into the first downstream exhaust passage 12b. Therefore, the exhaust air does not flow into the first heat exchanger 21, but flows only into the second heat exchanger 22.

[0042] Therefore, in the normal ventilation mode, only supply-side air flows through the first heat exchanger 21, and only discharge-side air flows through the second heat exchanger 22. That is, in the normal ventilation mode, the supply-side air and the discharge-side air do not cross each other in either the first heat exchanger 21 or the second heat exchanger 22, and no heat exchange occurs between the supply-side air and the discharge-side air.

[0043] In addition, when the control device 50 changes the operating mode from the heat exchange ventilation mode to the normal ventilation mode, it increases the air volume blown by the first air supply fan 31 and the air volume blown by the second exhaust fan 42 compared to before the change.

[0044] In this example, when the control device 50 changes the operating mode from the heat exchange ventilation mode to the normal ventilation mode, it increases the air volume blown by the first air supply fan 31 and the air volume blown by the second exhaust fan 42 to twice the volume before the change.

[0045] 11 is a block diagram showing a control system of the heat exchange type ventilation device according to embodiment 1. The control device 50 has a temperature detection unit 51, a mode selection unit 52, and a blower control unit 53 as functional blocks.

[0046] The temperature detection unit 51 detects the temperature of the supply-side air based on a signal from an outdoor temperature sensor 61. The temperature detection unit 51 also detects the temperature of the discharge-side air based on a signal from an indoor temperature sensor 62.

[0047] The mode selection unit 52 selects an operation mode based on the operating state of the air conditioner, the supply-side air temperature, and the discharge-side air temperature. If the selected operation mode is the current operation mode, the mode selection unit 52 maintains the current operation mode. If the selected operation mode is not the current operation mode, the mode selection unit 52 switches the current operation mode to the selected operation mode.

[0048] The blower control unit 53 individually controls the first air supply blower 31, the second air supply blower 32, the first exhaust blower 41, and the second exhaust blower 42 according to the operating mode selected by the mode selection unit 52.

[0049] Fig. 12 is a flowchart showing the operation mode selection process by the control device 50 of Fig. 11. The control device 50 repeatedly executes the operation mode selection process of Fig. 12 while the air conditioner is in operation.

[0050] When the operation mode selection process is started, the control device 50 determines in step S101 whether the air conditioner is in cooling operation. Information on whether the air conditioner is in cooling operation is, for example, automatically transmitted from the air conditioner to the control device 50. Information on whether the air conditioner is in cooling operation may also be input to the control device 50 by the user.

[0051] If the air conditioner is in cooling operation, the control device 50 determines in step S102 whether the temperature of the discharge side air is lower than the temperature of the supply side air, i.e., whether the indoor temperature is lower than the outdoor temperature.

[0052] If the indoor temperature is lower than the outdoor temperature, the control device 50 selects the heat exchange ventilation mode as the operation mode in step S103 and ends the processing for that round. If the indoor temperature is not lower than the outdoor temperature, the control device 50 selects the normal ventilation mode as the operation mode in step S104 and ends the processing for that round.

[0053] If it is determined in step S101 that the air conditioner is not in cooling operation, the control device 50 determines that the air conditioner is in heating operation. Then, in step S105, the control device 50 determines whether the temperature of the discharge-side air is higher than the temperature of the supply-side air, i.e., whether the indoor temperature is higher than the outdoor temperature.

[0054] If the indoor temperature is higher than the outdoor temperature, the control device 50 selects the heat exchange ventilation mode as the operation mode in step S106 and ends the processing for that round. If the indoor temperature is not higher than the outdoor temperature, the control device 50 selects the normal ventilation mode as the operation mode in step S107 and ends the processing for that round.

[0055] In this type of heat exchange type ventilation system, the first heat exchanger 21 and the second heat exchanger 22 are arranged in parallel to each other. The supply-side blower 30 has a first supply air blower 31 and a second supply air blower 32. The discharge-side blower 40 has a first exhaust air blower 41 and a second exhaust air blower 42.

[0056] The air supply passage 11 has a first downstream air supply passage 11b and a second downstream air supply passage 11c, and the air exhaust passage 12 has a first downstream exhaust passage 12b and a second downstream exhaust passage 12c.

[0057] In addition, in the normal ventilation mode, the control device 50 controls the supply side blower 30 and the discharge side blower 40 so that the amount of crossover between the supply side air and the discharge side air in each of the first heat exchanger 21 and the second heat exchanger 22 is reduced compared to in the heat exchange ventilation mode.

[0058] Therefore, there is no need to provide an air passage that does not pass through the heat exchange device 20 and a switching mechanism to that air passage. Therefore, it is possible to suppress an increase in the load on the air conditioner while suppressing an increase in the size of the entire device.

[0059] Furthermore, an increase in the number of parts can be suppressed, and an increase in pressure loss can also be suppressed.

[0060] Furthermore, in the normal ventilation mode, the control device 50 stops the first supply air fan 31 and the second exhaust air fan 42, and stops the second supply air fan 32 and the first exhaust air fan 41. This makes it possible to more reliably suppress an increase in the load on the air conditioner.

[0061] Furthermore, when the control device 50 changes the operation mode from the heat exchange ventilation mode to the normal ventilation mode, it increases the air volume blown by the first supply air blower 31 and the air volume blown by the second exhaust air blower 42, compared to before the change. This makes it possible to suppress a decrease in the total air volume blown in the normal ventilation mode.

[0062] In particular, by increasing the air volume blown by the first air supply fan 31 and the air volume blown by the second exhaust fan 42 to twice the volume before the change, the total air volume can be made equal before and after the change in operating mode.

[0063] Embodiment 2. Next, Fig. 13 is a perspective view showing the internal equipment of a heat exchanger type ventilation device according to embodiment 2. Fig. 14 is a side view showing the internal equipment of Fig. 13. Fig. 15 is a plan view showing the supply air duct 11 in the heat exchanger type ventilation device of Fig. 13. Fig. 16 is a plan view showing the exhaust air duct 12 in the heat exchanger type ventilation device of Fig. 13. Fig. 17 is a cross-sectional view showing the flow of supply-side air and exhaust-side air in the heat exchanger device 20 of Fig. 13. Fig. 18 is a plan view showing the flow of supply-side air and exhaust-side air in normal ventilation mode of embodiment 2.

[0064] In the first embodiment, both the supply-side blower 30 and the discharge-side blower 40 are arranged in one of the two regions inside the housing 10 separated by the heat exchanger 20. In contrast, in the second embodiment, the supply-side blower 30 is arranged in one of the two regions inside the housing 10 separated by the heat exchanger 20, and the discharge-side blower 40 is arranged in the other region.

[0065] Other configurations and operations in the second embodiment are the same as those in the first embodiment. Even with this configuration, the same effects as those in the first embodiment can be obtained.

[0066] Embodiment 3 Next, a heat exchange type ventilation system according to embodiment 3 will be described. In the heat exchange type ventilation system of embodiment 3, a blowing capacity set value, which is a value related to the blowing capacity of first supply air blower 31, is set in control device 50. The blowing capacity set value is set to the upper limit of the blowing capacity of first supply air blower 31 or a value close to the upper limit. In normal ventilation mode, control device 50 monitors whether the required amount of supply-side air supplied to the room is equal to or less than the blowing capacity set value.

[0067] In the normal ventilation mode, when the required amount of supply-side air supplied to the room exceeds the set air blowing capacity value, the control device 50 operates the second supply air fan 32 and the first exhaust air fan 41 at a slower speed than in the heat exchange ventilation mode. That is, the control device 50 operates the first supply air fan 31 and the second exhaust air fan 42 at a high speed and the second supply air fan 32 and the first exhaust air fan 41 at a low speed. This compensates for the shortage of supply-side air.

[0068] Other configurations and operations in embodiment 3 are the same as those in embodiment 1 or embodiment 2. With this configuration, it is possible to obtain the same effects as in embodiment 1. Furthermore, in the normal ventilation mode, it is possible to suppress the amount of heat exchange between the supply-side air and the discharge-side air while maintaining a sufficient amount of supply-side air supplied to the room.

[0069] 19 is a perspective view showing the main parts of a heat exchanger type ventilation system according to embodiment 4. In the heat exchanger type ventilation system of embodiment 4, shutters 15 are provided at the second indoor air supply port 10c, which is the outlet for the second downstream air supply passage 11c to the room, and at the first outdoor exhaust port 10e, which is the outlet for the first downstream exhaust passage 12b to the outside.

[0070] In the normal ventilation mode, when the second air supply fan 32 and the first exhaust fan 41 are stopped, the second indoor air supply port 10c and the first outdoor exhaust port 10e are each closed by the shutter 15, as shown in Figure 20.

[0071] Each shutter 15 opens and closes by rotating around a vertical axis 16. Each shutter 15 closes due to the wind pressure of the supply air from the first indoor air supply port 10b and the wind pressure of the exhaust air from the second outdoor exhaust port 10f. Each shutter 15 opens due to the wind pressure of the supply air from the second indoor air supply port 10c and the wind pressure of the exhaust air from the first outdoor exhaust port 10e.

[0072] Other configurations and operations in the fourth embodiment are the same as those in the first, second, or third embodiment. Even with this configuration, the same effects as those in the first embodiment can be obtained.

[0073] Furthermore, when the second air supply fan 32 and the first air exhaust fan 41 are stopped in the normal ventilation mode, the second indoor air supply port 10c and the first outdoor air exhaust port 10e are each closed by the shutter 15.

[0074] This prevents backflow of air from the second indoor air supply port 10c to the second downstream air supply path 11c and from the first outdoor exhaust port 10e to the first downstream exhaust path 12b, thereby suppressing air circulation within the housing 10 and preventing a decrease in the supply amount of supply-side air and a decrease in the discharge amount of exhaust-side air.

[0075] Furthermore, the blades of the second air supply fan 32 and the first exhaust fan 41 are prevented from rotating in the opposite direction due to a backflow of air, thereby allowing the second air supply fan 32 and the first exhaust fan 41 to be smoothly restarted. Furthermore, the generation of electromotive force in the DC motors of the second air supply fan 32 and the first exhaust fan 41 is suppressed, preventing adverse effects on the circuit boards of the DC motors and the circuit board of the control device 50.

[0076] Furthermore, each shutter 15 opens and closes in response to wind pressure, so that the second indoor air supply port 10c and the first outdoor air exhaust port 10e can be opened and closed with a simple configuration.

[0077] Each shutter 15 opens and closes by rotating about a vertical shaft 16. Therefore, each shutter 15 can be easily opened and closed with a small force.

[0078] Each shutter 15 may be an electric shutter. The electric shutter is a shutter that opens and closes using the driving force of, for example, a geared motor or a stepping motor. In this case, the second indoor air supply port 10c and the first outdoor air exhaust port 10e can be opened and closed more reliably with more appropriate timing.

[0079] Embodiment 5 Next, a heat exchange type ventilation device according to embodiment 5 will be described. In the heat exchange ventilation mode, the control device 50 in embodiment 5 operates all of the first air supply fan 31, the second air supply fan 32, the first exhaust fan 41, and the second exhaust fan 42.

[0080] In addition, in the normal ventilation mode, the control device 50 operates the first air supply fan 31 and the second exhaust fan 42 at a higher speed than in the heat exchange ventilation mode, and operates the second air supply fan 32 and the first exhaust fan 41 at a lower speed than in the heat exchange ventilation mode.

[0081] Other configurations and operations in the fifth embodiment are the same as those in the first or second embodiment.

[0082] In this type of heat exchange type ventilation system, the first heat exchanger 21 and the second heat exchanger 22 are arranged in parallel to each other. The supply-side blower 30 has a first supply air blower 31 and a second supply air blower 32. The discharge-side blower 40 has a first exhaust air blower 41 and a second exhaust air blower 42.

[0083] The air supply passage 11 has a first downstream air supply passage 11b and a second downstream air supply passage 11c, and the air exhaust passage 12 has a first downstream exhaust passage 12b and a second downstream exhaust passage 12c.

[0084] In addition, the control device 50 operates the first air supply fan 31 and the second exhaust fan 42 at a higher speed than in the heat exchange ventilation mode, and operates the second air supply fan 32 and the first exhaust fan 41 at a lower speed than in the heat exchange ventilation mode.

[0085] Therefore, there is no need to provide an air passage that does not pass through the heat exchange device 20 and a switching mechanism to that air passage. Therefore, it is possible to suppress an increase in the load on the air conditioner while suppressing an increase in the size of the entire device.

[0086] Furthermore, an increase in the number of parts can be suppressed, and an increase in pressure loss can also be suppressed.

[0087] Furthermore, the amount of heat exchanged between the supply-side air and the discharge-side air can be suppressed while maintaining a sufficient amount of supply-side air supplied to the room.

[0088] In the first to fifth embodiments, the outdoor temperature sensor 61 may be any sensor capable of detecting the outdoor temperature, and may be provided outside the room as a separate unit from the heat exchange type ventilation device, for example.

[0089] In addition, in the first to fifth embodiments, the indoor temperature sensor 62 may be provided in the room as a separate unit from the heat exchange type ventilation device, as long as it can detect the indoor temperature.

[0090] In addition, in the first to fifth embodiments, the indoor temperature information and the outdoor temperature information may be received from an external device.

[0091] Furthermore, in the first to fifth embodiments, the operation mode is switched based on the operating state of the air conditioner, the indoor temperature, and the outdoor temperature, but it may also be switched based on other information, for example, seasonal information.

[0092] In addition, in the first to fifth embodiments, the operation mode may be switched manually.

[0093] In addition, in the first to fifth embodiments, the air supply duct 11 and the air exhaust duct 12 may each be branched into three or more paths.

[0094] Each function of the control device 50 according to the first to fifth embodiments is realized by a processing circuit. Fig. 21 is a configuration diagram showing a first example of a processing circuit that realizes each function of the control device 50 according to the first to fifth embodiments. The processing circuit 100 of the first example is dedicated hardware.

[0095] 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 50 may be realized by a separate processing circuit 100, or all functions may be realized by the processing circuit 100.

[0096] 22 is a configuration diagram showing a second example of a processing circuit that realizes each function of the control device 50 according to the first to fifth embodiments. The processing circuit 200 of the second example includes a processor 201 and a memory 202.

[0097] In the processing circuit 200, each function of the control device 50 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.

[0098] The programs stored in memory 202 can be said to cause the computer to execute the procedures or methods of the above-mentioned components. 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.

[0099] 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.

[0100] 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.

[0101] 10 Housing, 10c Second indoor air supply port, 10e First outdoor exhaust port, 11 Air supply duct, 11b First downstream air supply duct, 11c Second downstream air supply duct, 12 Exhaust air duct, 12b First downstream exhaust duct, 12c Second downstream exhaust duct, 15 Shutter, 16 Shaft, 20 Heat exchanger, 21 First heat exchanger, 22 Second heat exchanger, 30 Supply side blower, 31 First air supply fan, 32 Second air supply fan, 40 Discharge side blower, 41 First exhaust fan, 42 Second exhaust fan, 50 Control device.

Claims

1. A housing having an air supply passage from the outside to the inside and an exhaust passage from the inside to the outside inside, A heat exchange device provided in the housing, which performs heat exchange between the supply side air, which is the air flowing through the intake air passage, and the discharge side air, which is the air flowing through the exhaust air passage. A supply-side air blower provided in the aforementioned air intake passage, The exhaust side blower provided in the exhaust air passage, and A control device that controls the supply-side air blower and the exhaust-side air blower using multiple operating modes, including a heat exchange ventilation mode and a normal ventilation mode. Equipped with, The heat exchange apparatus comprises a first heat exchanger and a second heat exchanger arranged in parallel with each other. The supply-side air blower comprises a first air supply blower and a second air supply blower. The aforementioned exhaust-side blower includes a first exhaust blower and a second exhaust blower. The air supply passage includes a first downstream air supply passage provided between the first heat exchanger and the first air supply fan, and a second downstream air supply passage provided between the second heat exchanger and the second air supply fan, independently of the first downstream air supply passage. The exhaust air passage includes a first downstream exhaust passage provided between the first heat exchanger and the first exhaust blower, and a second downstream exhaust passage provided between the second heat exchanger and the second exhaust blower, independently of the first downstream exhaust passage. The control device is A heat exchange ventilation system that controls the first supply fan, the second supply fan, the first exhaust fan, and the second exhaust fan in the normal ventilation mode such that the amount of crossing between the supply air and the exhaust air in the first heat exchanger and the second heat exchanger is reduced compared to the heat exchange ventilation mode.

2. The control device is In the heat exchange ventilation mode, the first supply air blower, the second supply air blower, the first exhaust air blower, and the second exhaust air blower are operated. The heat exchange ventilation device according to claim 1, wherein in the normal ventilation mode, the first supply air blower and the second exhaust air blower are operated, and the second supply air blower and the first exhaust air blower are stopped.

3. The heat exchange ventilation system according to claim 2, wherein when the control device changes the operating mode from the heat exchange ventilation mode to the normal ventilation mode, the amount of air supplied by the first supply air blower and the amount of air supplied by the second exhaust air blower are increased compared to before the change.

4. The heat exchange ventilation system according to claim 3, wherein when the control device changes the operating mode from the heat exchange ventilation mode to the normal ventilation mode, the amount of air supplied by the first supply air blower and the amount of air supplied by the second exhaust air blower are each increased to twice the amount before the change.

5. The control device is configured with a set value for the airflow capacity of the first air supply fan, The heat exchange ventilation device according to claim 2, wherein the control device operates the second supply fan and the first exhaust fan at a lower speed than in the heat exchange ventilation mode when the required supply amount of the supply side air exceeds the set value of the fan capacity in the normal ventilation mode.

6. The control device is configured with a set value for the airflow capacity of the first air supply fan, The heat exchange ventilation system according to claim 3, wherein the control device operates the second supply fan and the first exhaust fan at a lower speed than in the heat exchange ventilation mode when the required supply amount of the supply side air exceeds the set value of the fan capacity in the normal ventilation mode.

7. A shutter is provided at the second indoor air inlet, which is the outlet for the second downstream air supply passage into the room, and at the first outdoor exhaust outlet, which is the outlet for the first downstream exhaust passage to the outside. The heat exchange ventilation device according to any one of claims 2 to 6, wherein when the second supply air blower and the first exhaust air blower are stopped in the normal ventilation mode, the second indoor air supply port and the first outdoor exhaust port are each closed by the shutter.

8. Each of the shutters is opened and closed by wind pressure in the heat exchange ventilation device according to claim 7.

9. The heat exchange ventilation device according to claim 8, wherein each shutter opens and closes by rotating about a vertical axis.

10. The heat exchange ventilation device according to claim 7, wherein each of the shutters is an electric shutter.

11. The control device is In the heat exchange ventilation mode, the first supply air blower, the second supply air blower, the first exhaust air blower, and the second exhaust air blower are operated. The heat exchange ventilation device according to claim 1, wherein in the normal ventilation mode, the first supply air blower and the second exhaust air blower are operated at a higher speed than in the heat exchange ventilation mode, and the second supply air blower and the first exhaust air blower are operated at a lower speed than in the heat exchange ventilation mode.