Heat exchange-type ventilation device

Abstract

In this heat exchange-type ventilation device, an air supply air passage is divided into a common air supply air passage and a non-common air supply air passage. An exhaust air passage is divided into a common exhaust air passage and a non-common exhaust air passage. The position of the common air supply air passage and the position of the common exhaust air passage relative to a heat exchange device are shifted from each other. During operation in the normal ventilation mode, a control device closes the non-common air supply air passage by an air supply air passage switching damper, and closes the non-common exhaust air passage by an exhaust air passage switching damper.

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 entire device from becoming large.

[0006] The heat exchange type ventilation device according to the present disclosure includes a housing having an intake air duct from the outside to the inside of the room and an exhaust air duct from the inside to the outside of the room provided therein, a heat exchange device provided in the housing and performing heat exchange between supply-side air which is air flowing through the intake air duct and exhaust-side air which is air flowing through the exhaust air duct, a supply-side blower provided in the intake air duct, an exhaust-side blower provided in the exhaust air duct, and a control device which 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 intake air duct is divided into a common intake air duct and a non-common intake air duct, and the exhaust air duct is divided into a common exhaust air duct and a non-common exhaust air duct. The positions of the common intake air duct and the common exhaust air duct relative to the heat exchanger are offset from each other, the intake air duct is provided with an intake air duct switching damper that opens and closes the non-common intake air duct, and the exhaust air duct is provided with an exhaust air duct switching damper that opens and closes the non-common exhaust air duct, and when operating in the heat exchange ventilation mode, the control device opens the non-common intake air duct with the intake air duct switching damper and opens the non-common exhaust air duct with the exhaust air duct switching damper, and when operating in the normal ventilation mode, closes the non-common intake air duct with the intake air duct switching damper and closes the non-common exhaust air duct with the exhaust air duct switching damper.

[0007] According to the heat exchange type ventilation device of the present disclosure, it is possible to prevent the device from becoming large in size as a whole.

[0008] 7 is a plan view showing a heat exchanger-type ventilation device according to Embodiment 1. FIG. 9 is a front view of the heat exchanger-type ventilation device of FIG. 1, as seen along arrow II. FIG. 10 is an explanatory diagram showing an intake air duct when the heat exchanger-type ventilation device of FIG. 1 is operated in a heat exchange ventilation mode. FIG. 9 is an explanatory diagram showing an exhaust air duct when the heat exchanger-type ventilation device of FIG. 1 is operated in a heat exchange ventilation mode. FIG. 9 is an explanatory diagram showing an intake air duct when the heat exchanger-type ventilation device of FIG. 1 is operated in a normal ventilation mode. FIG. 9 is an explanatory diagram showing an exhaust air duct when the heat exchanger-type ventilation device of FIG. 1 is operated in a normal ventilation mode. FIG. 9 is a block diagram showing a control system for a heat exchanger-type ventilation device according to Embodiment 1. FIG. 7 is a flowchart showing the operation mode selection process by the control device of FIG. 7. FIG. 9 is a plan view showing a heat exchanger-type ventilation device according to Embodiment 2. FIG. 9 is an explanatory diagram showing an intake air duct when the heat exchanger-type ventilation device of FIG. 9 is operated in a heat exchange ventilation mode. FIG. 9 is an explanatory diagram showing an exhaust air duct when the heat exchanger-type ventilation device of FIG. 9 is operated in a heat exchange ventilation mode. FIG. 9 is an explanatory diagram showing an intake air duct when the heat exchanger-type ventilation device of FIG. 9 is operated in a normal ventilation mode. Fig. 10 is an explanatory diagram showing an exhaust air duct when the heat exchange type ventilation device of Fig. 9 is operated in a normal ventilation mode. Fig. 11 is a configuration diagram showing a first example of a processing circuit that realizes each function of the control device of embodiments 1 and 2. Fig. 12 is a configuration diagram showing a second example of a processing circuit that realizes each function of the control device of embodiments 1 and 2.

[0009] Hereinafter, embodiments will be described with reference to the drawings. Embodiment 1. Fig. 1 is a plan view showing a heat exchange type ventilation device according to embodiment 1. Fig. 2 is a front view of the heat exchange type ventilation device of Fig. 1 as seen along arrow II.

[0010] The heat exchange type ventilation system includes a housing 10, 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.

[0011] The housing 10 is installed, for example, above the ceiling. The housing 10 has a rectangular parallelepiped outer shape. An indoor air inlet 10a and an indoor air supply vent 10b are provided on a first side, which is one of the four sides of the housing 10. An outdoor air inlet 10c and an outdoor exhaust vent 10d are provided on a second side, which is the side opposite the first side, of the four sides of the housing 10.

[0012] The indoor air inlet 10a is connected to the room via an indoor air inlet duct (not shown). The indoor air supply 10b is connected to the room via an air supply duct (not shown). The room is the internal space of the room to be ventilated.

[0013] The outdoor air inlet 10c is connected to the outside of the room via an outdoor air inlet duct (not shown). The outdoor air outlet 10d is connected to the outside of the room via an exhaust duct (not shown). The outside of the room refers to the space outside the room to be ventilated, such as the outdoors, another room adjacent to the room to be ventilated, a hallway, etc.

[0014] 1 and 2 show the internal configuration of the housing 10. Inside the housing 10, a first upper and lower partition plate 71, a second upper and lower partition plate 72, an intake airflow path switching damper 73, an exhaust airflow path switching damper 74, an intake airflow path partition wall 75, and an exhaust airflow path partition wall 76 are provided.

[0015] The space within the housing 10 is divided into upper and lower spaces by a first upper and lower partition plate 71 and a second upper and lower partition plate 72. The indoor air inlet port 10a faces the space below the first upper and lower partition plate 71. The outdoor air inlet port 10c faces the space above the first upper and lower partition plate 71.

[0016] The indoor air supply port 10b faces the space below the second upper and lower partition plate 72. The outdoor air exhaust port 10d faces the space above the second upper and lower partition plate 72.

[0017] The supply air path switching damper 73 is provided below the second upper and lower partition plate 72. The supply air path switching damper 73 can be rotated around a vertical axis by a first switching motor (not shown).

[0018] The exhaust airflow path switching damper 74 is provided above the second upper and lower partition plate 72. The exhaust airflow path switching damper 74 can be rotated around a vertical axis by a second switching motor (not shown).

[0019] The supply airflow path partition wall 75 is fixed to the inside of the housing 10 below the second upper and lower partition plate 72. The exhaust airflow path partition wall 76 is fixed to the inside of the housing 10 above the second upper and lower partition plate 72.

[0020] The heat exchanger 20 is provided between a first upper and lower partition plate 71 and a second upper and lower partition plate 72 inside the housing 10 .

[0021] Within the housing 10, an air supply passage 11 as indicated by the solid arrow in FIG. 2 and an air exhaust passage 12 as indicated by the hollow arrow in FIG. 2 are formed.

[0022] The supply air duct 11 is an air path that enters the housing 10 from the outdoor air inlet 10c, passes through the heat exchanger 20, and reaches the indoor air supply port 10b. 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 10c passes through the supply air duct 11 and is supplied into the room from the indoor air supply port 10b.

[0023] The exhaust air duct 12 is an air duct that enters the housing 10 from the indoor air inlet 10a, passes through the heat exchanger 20, and reaches the outdoor air outlet 10d. That is, the exhaust air duct 12 is a flow path for air 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 outdoor air outlet 10d.

[0024] The supply air duct 11 is separated from the exhaust air duct 12 by an supply air duct partition wall 75. The exhaust air duct 12 is separated from the supply air duct 11 by an exhaust air duct partition wall 76.

[0025] The heat exchanger 20 is disposed midway between the supply air duct 11 and the exhaust air duct 12, and 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.

[0026] The heat exchanger 20 is also configured so that the supply-side air and the discharge-side air do not mix.

[0027] The supply-side blower 30 faces the indoor air supply port 10b and is provided in the supply air duct 11. The supply-side blower 30 sends the supply-side air into the room through the indoor air supply port 10b.

[0028] The discharge-side blower 40 is provided in the exhaust air passage 12 facing the exterior exhaust port 10d. The discharge-side blower 40 also discharges the discharge-side air to the outside of the room through the exterior exhaust port 10d.

[0029] The outdoor temperature sensor 61 is provided in the supply air duct 11 between the outdoor air inlet 10c 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 10c.

[0030] 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.

[0031] The control device 50 is provided in the housing 10. The control device 50 controls the supply-side blower 30, the discharge-side blower 40, the supply air path switching damper 73, and the exhaust air path switching damper 74 in a plurality of operation modes. The plurality of operation modes includes a heat exchange ventilation mode and a normal ventilation mode.

[0032] 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.

[0033] An air conditioner (not shown) is installed in the room. The control device 50 switches the operation mode based on signals from the outdoor temperature sensor 61, the indoor temperature sensor 62, and the operating state of the air conditioner.

[0034] The control device 50 sets the operation mode to the heat exchange ventilation mode when the temperature of the discharge air is lower than the temperature of the supply air during cooling operation of the air conditioner. The control device 50 also sets the operation mode to the heat exchange ventilation mode when the temperature of the discharge air is higher than the temperature of the supply air during heating operation of the air conditioner. This reduces the load on the air conditioner.

[0035] 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.

[0036] 3 is an explanatory diagram showing the supply air duct 11 when the heat exchange ventilation system of FIG. 1 is operating in the heat exchange ventilation mode. The supply air duct switching damper 73 is provided in the supply air duct 11 downstream of the heat exchange device 20. The supply air duct 11 downstream of the heat exchange device 20 is divided by the supply air duct switching damper 73 into a common supply air duct 11a and a non-common supply air duct 11b.

[0037] The common supply air duct 11a is an air duct through which supply-side air flows both in the heat exchange ventilation mode and in the normal ventilation mode. The supply air duct switching damper 73 opens and closes the non-common supply air duct 11b.

[0038] During operation in the heat exchange ventilation mode, the control device 50 opens the non-common supply air duct 11b using the supply air duct switching damper 73. Therefore, during operation in the heat exchange ventilation mode, supply-side air also flows through the non-common supply air duct 11b.

[0039] 4 is an explanatory diagram showing the exhaust air duct 12 when the heat exchange type ventilation device of FIG. 1 is operating in the heat exchange ventilation mode. An exhaust air duct switching damper 74 is provided in the exhaust air duct 12 downstream of the heat exchange device 20. The exhaust air duct 12 downstream of the heat exchange device 20 is divided by the exhaust air duct switching damper 74 into a common exhaust air duct 12a and a non-common exhaust air duct 12b.

[0040] The common exhaust air duct 12a is an air duct through which exhaust air flows both during operation in the heat exchange ventilation mode and during operation in the normal ventilation mode. The exhaust air duct switching damper 74 opens and closes the non-common exhaust air duct 12b.

[0041] During operation in the heat exchange ventilation mode, the control device 50 opens the non-common exhaust air duct 12b using the exhaust air duct switching damper 74. Therefore, during operation in the heat exchange ventilation mode, supply-side air also flows through the non-common exhaust air duct 12b.

[0042] As shown in FIGS. 3 and 4, during operation in the heat exchange ventilation mode, heat exchange between the supply-side air and the discharge-side air is actively carried out throughout the heat exchange device 20.

[0043] 5 is an explanatory diagram showing the supply air duct 11 when the heat exchange type ventilation system of FIG. 1 is operating in normal ventilation mode. When operating in normal ventilation mode, the control device 50 closes the non-common supply air duct 11b using the supply air duct switching damper 73. Therefore, when operating in normal ventilation mode, the supply-side air does not flow into the non-common supply air duct 11b, but flows only into the common supply air duct 11a.

[0044] 6 is an explanatory diagram showing the exhaust air duct 12 when the heat exchange type ventilation system of FIG. 1 is operating in normal ventilation mode. When operating in normal ventilation mode, the control device 50 closes the non-common exhaust air duct 12b using the exhaust air duct switching damper 74. Therefore, when operating in normal ventilation mode, the exhaust side air does not flow into the non-common exhaust air duct 12b, but flows only into the common exhaust air duct 12a.

[0045] 5 and 6, the positions of the common supply air duct 11a and the common exhaust air duct 12a are offset from each other with respect to the heat exchanger 20. Therefore, during operation in the normal ventilation mode, the supply-side air and the exhaust-side air pass through different positions with respect to the heat exchanger 20.

[0046] Therefore, when operating in the normal ventilation mode, no active heat exchange takes place between the supply air and the discharge air, and fresh outdoor air is simply supplied into the room.

[0047] Furthermore, during operation in the normal ventilation mode, the supply air duct 11 is limited to the common supply air duct 11a, and the exhaust air duct 12 is limited to the common exhaust air duct 12a. This increases the pressure loss within the housing 10, which may reduce the supply air volume and the exhaust air volume.

[0048] Therefore, when the operation mode is changed from the heat exchange ventilation mode to the normal ventilation mode, the control device 50 increases the airflow rate of the supply-side blower 30 and the airflow rate of the discharge-side blower 40, respectively, from levels before the change. This makes it possible to suppress a decrease in the supply airflow rate and the exhaust airflow rate.

[0049] In this case, the outputs of the supply-side blower 30 and the discharge-side blower 40 do not necessarily need to be increased to the extent that the supply air volume and the exhaust air volume are maintained in the heat exchange ventilation mode.

[0050] 7 is a block diagram showing a control system of the heat exchange type ventilation device according to embodiment 1. The control device 50 has, as functional blocks, a temperature detection unit 51, a state detection unit 52, a mode selection unit 53, an air blow control unit 54, and an air path switching control unit 55.

[0051] The temperature detection unit 51 detects the temperature of the supply-side air based on a signal from the outdoor temperature sensor 61. The temperature detection unit 51 also detects the temperature of the discharge-side air based on a signal from the indoor temperature sensor 62. The state detection unit 52 detects the operating state of the air conditioner.

[0052] The mode selection unit 53 selects the heat exchange ventilation mode or the normal ventilation mode as the operation mode based on the operation state of the air conditioner, the supply-side air temperature, and the discharge-side air temperature. Furthermore, if the selected operation mode is the current operation mode, the mode selection unit 53 maintains the current operation mode. Furthermore, if the selected operation mode is not the current operation mode, the mode selection unit 53 switches the current operation mode to the selected operation mode.

[0053] The air blowing control unit 54 controls the supply-side air blower 30 and the discharge-side air blower 40 in accordance with the operation mode selected by the mode selection unit 53 .

[0054] The airflow path switching control unit 55 controls the supply airflow path switching damper 73 and the exhaust airflow path switching damper 74 in accordance with the operation mode selected by the mode selection unit 53 .

[0055] Specifically, the air path switching control unit 55 controls the first switching motor to rotate the supply air path switching damper 73 between the open position shown in Fig. 3 and the closed position shown in Fig. 5. The air path switching control unit 55 also controls the second switching motor to rotate the exhaust air path switching damper 74 between the open position shown in Fig. 4 and the closed position shown in Fig. 6.

[0056] Fig. 8 is a flowchart showing the operation mode selection process by the control device 50 of Fig. 7. The control device 50 repeatedly executes the operation mode selection process of Fig. 8 while the air conditioner is in operation.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] In this heat exchange type ventilation system, the supply air duct 11 is divided into a common supply air duct 11a and a non-common supply air duct 11b by the supply air duct switching damper 73. The exhaust air duct 12 is divided into a common exhaust air duct 12a and a non-common exhaust air duct 12b by the exhaust air duct switching damper 74. The positions of the common supply air duct 11a and the common exhaust air duct 12a relative to the heat exchange system 20 are offset from each other.

[0063] Furthermore, during operation in the heat exchange ventilation mode, the control device 50 opens the non-common supply air duct 11b with the supply air duct switching damper 73, and opens the non-common exhaust air duct 12b with the exhaust air duct switching damper 74. Furthermore, during operation in the normal ventilation mode, the control device 50 closes the non-common supply air duct 11b with the supply air duct switching damper 73, and closes the non-common exhaust air duct 12b with the exhaust air duct switching damper 74.

[0064] Therefore, there is no need to secure a dedicated air passage that bypasses the heat exchange device 20, and 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.

[0065] Furthermore, when the operation mode is changed from the heat exchange ventilation mode to the normal ventilation mode, the control device 50 increases the airflow rate of the supply-side blower 30 and the airflow rate of the discharge-side blower 40, compared to before the change. This makes it possible to suppress a decrease in the supply airflow rate and the exhaust airflow rate, and maintain a sufficient ventilation rate.

[0066] Embodiment 2. Next, Fig. 9 is a plan view showing a heat exchanger type ventilation apparatus according to embodiment 2. Fig. 10 is an explanatory diagram showing the supply air duct 11 when the heat exchanger type ventilation apparatus of Fig. 9 is operating in the heat exchange ventilation mode. Fig. 11 is an explanatory diagram showing the exhaust air duct 12 when the heat exchanger type ventilation apparatus of Fig. 9 is operating in the heat exchange ventilation mode. Fig. 12 is an explanatory diagram showing the supply air duct 11 when the heat exchanger type ventilation apparatus of Fig. 9 is operating in the normal ventilation mode. Fig. 13 is an explanatory diagram showing the exhaust air duct 12 when the heat exchanger type ventilation apparatus of Fig. 9 is operating in the normal ventilation mode.

[0067] The supply-side blower 30 of the second embodiment is configured by combining a plurality of supply air blowers. In this example, the supply-side blower 30 is configured by combining two supply air blowers, namely, a first supply air blower 31 and a second supply air blower 32. The first supply air blower 31 and the second supply air blower 32 are provided in parallel with each other in the supply air duct 11.

[0068] The discharge-side blower 40 of the second embodiment is configured by combining a plurality of exhaust fans. In this example, the discharge-side blower 40 is configured by combining two exhaust fans, namely, a first exhaust fan 41 and a second exhaust fan 42. The first exhaust fan 41 and the second exhaust fan 42 are provided in parallel with each other in the exhaust air passage 12.

[0069] 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.

[0070] The first air supply fan 31 and the second air supply fan 32 are combined to form the supply-side fan 30, and the first exhaust fan 41 and the second exhaust fan 42 are combined to form the exhaust-side fan 40. This allows the size of each fan to be reduced, making it possible to downsize the entire product while still ensuring air blowing performance.

[0071] In the second embodiment, the supply-side blower 30 may be configured by combining three or more supply fans. Similarly, the discharge-side blower 40 may be configured by combining three or more exhaust fans.

[0072] In the first and second 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.

[0073] In addition, in the first and second 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.

[0074] In the first and second embodiments, the indoor temperature information and the outdoor temperature information may be received from an external device.

[0075] Furthermore, in the first and second 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.

[0076] In the first and second embodiments, the operation mode may be switched manually. That is, the user may externally instruct the operation mode to be switched between the heat exchange ventilation mode and the normal ventilation mode.

[0077] Furthermore, in the first and second embodiments, the position of the common air supply duct 11a and the position of the common exhaust duct 12a relative to the heat exchanger 20 do not have to be completely different. That is, the position of the common air supply duct 11a and the position of the common exhaust duct 12a relative to the heat exchanger 20 may partially overlap.

[0078] In the first and second embodiments, the air supply duct 11 and the air exhaust duct 12 may each be branched into three or more paths.

[0079] In the first and second embodiments, the heat exchange device 20 may be configured by combining a plurality of heat exchangers.

[0080] Each function of the control device 50 according to the first and second embodiments is realized by a processing circuit. Fig. 14 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 and second embodiments. The processing circuit 100 of 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 50 may be realized by a separate processing circuit 100, or all functions may be realized by the processing circuit 100.

[0082] 15 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 and second embodiments. The processing circuit 200 of the second example includes a processor 201 and a memory 202.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 10 Housing, 11 Air intake duct, 11a Common air intake duct, 11b Non-common air intake duct, 12 Exhaust duct, 12a Common exhaust duct, 12b Non-common exhaust duct, 20 Heat exchanger, 30 Supply side blower, 31 First air intake fan, 32 Second air intake fan, 40 Exhaust side blower, 41 First exhaust fan, 42 Second exhaust fan, 50 Control device, 73 Air intake duct switching damper, 74 Exhaust duct switching damper.

Claims

1. A system comprising: a housing having an intake air duct from the outside to the inside of the room and an exhaust air duct from the inside of the room to the outside provided therein; a heat exchanger provided in the housing and performing heat exchange between supply-side air which is air flowing through the intake air duct and exhaust-side air which is air flowing through the exhaust air duct; a supply-side blower provided in the intake air duct; an exhaust-side blower provided in the exhaust air duct; 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; wherein the intake air duct is divided into a common intake air duct and a non-common intake air duct; the exhaust air duct is divided into a common exhaust air duct and a non-common exhaust air duct; the positions of the common intake air duct and the common exhaust air duct relative to the heat exchanger are offset from each other; and the intake air duct is provided with an intake air duct switching damper that opens and closes the non-common intake air duct; an exhaust air duct switching damper that opens and closes the non-common exhaust air duct, and the control device, when operating in the heat exchange ventilation mode, opens the non-common intake air duct with the intake air duct switching damper and opens the non-common exhaust air duct with the exhaust air duct switching damper, and when operating in the normal ventilation mode, closes the non-common intake air duct with the intake air duct switching damper and closes the non-common exhaust air duct with the exhaust air duct switching damper.

2. A heat exchange type ventilation device as described in claim 1, wherein when the control device changes the operating mode from the heat exchange ventilation mode to the normal ventilation mode, the control device increases the air volume blown by the supply side blower and the air volume blown by the discharge side blower, each compared to before the change.

3. A heat exchange type ventilation device as described in claim 1 or claim 2, wherein the supply side blower is configured by combining a plurality of intake blowers, and the exhaust side blower is configured by combining a plurality of exhaust blowers.

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