Ventilation system

Abstract

To obtain a ventilation system which enables improvement of a temperature of air which is supplied indoors by energy saving.SOLUTION: An ventilation system comprises: a building; and a heat exchange ventilation device having a housing in which an exhaust air duct for exhausting the indoor air of the building outdoors and an air supply air duct for supplying outdoor air indoors are independently formed, an exhaust blower arranged in the exhaust air duct, and generating an exhaust airflow flowing in the exhaust air duct, an air supply blower arranged in the air supply air duct, and generating an air supply airflow flowing in the air supply air duct, and a heat exchanger for exchanging heat between the air supply airflow and the exhaust airflow. The ventilation system comprises an auxiliary air duct for mixing air in a space other than an indoor space with the outdoor air which is introduced into the heat exchange ventilation device, or the indoor air which is introduced into the heat exchange ventilation device, an auxiliary air duct air quantity adjustment part 30 for adjusting an air quantity of air in a space other than indoor space which flows in the auxiliary air duct, and an auxiliary air duct air quantity control part 50 for controlling the auxiliary air duct air quantity adjustment part 30.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a ventilation system that ventilates a building having an insulated airtight compartment while exchanging heat between an intake air flow and an exhaust air flow. [Background technology]

[0002] In recent years, the insulation and airtightness of buildings have improved, and laws and regulations such as the Act on Improvement of Energy Consumption Performance of Buildings are promoting the introduction of highly airtight and insulated buildings. At the same time, the introduction of energy-saving equipment such as highly efficient heating and cooling equipment and heat exchange ventilation equipment is being recommended.

[0003] It is possible to reduce the energy consumption of a building by improving its insulation and airtightness or by introducing energy-saving equipment, but various methods are being explored to achieve further energy savings by combining the building's structure, layout, and equipment functions.

[0004] Patent Document 1 discloses a ventilation method in which air heated by solar radiation or cooled by radiative cooling from an air layer along the inner surface of a roof or an air layer along the inner surface of an exterior wall is introduced into a total heat exchanger as outside air, where it exchanges heat with indoor air and is supplied to the room. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6914495 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the ventilation method described in Patent Document 1, the air supply path for introducing outside air is complicated and long, and it is necessary to ensure a large air-blowing capacity of the total heat exchanger. Therefore, in the ventilation method described in Patent Document 1, the power required for the actual operation of the total heat exchanger is increased by the amount of the increased air-blowing capacity, which reduces the effectiveness of the ventilation method from the viewpoint of improving energy-saving performance.

[0007] The present disclosure has been made in consideration of the above, and has an object to provide a ventilation system that can improve the temperature of air supplied to a room while saving energy. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems and achieve the object, the ventilation system according to the present disclosure includes a building, a housing having an exhaust air duct for exhausting indoor air of the building to the outdoors and an intake air duct for supplying outdoor air to the indoors, and a heat exchange ventilator including an exhaust fan provided in the exhaust air duct for generating an exhaust flow flowing through the exhaust air duct, an intake air duct provided in the intake air duct for generating an intake air flow flowing through the intake air duct, and a heat exchanger for exchanging heat between the intake air flow and the exhaust air flow. The ventilation system includes an auxiliary air duct for mixing outdoor air introduced into the heat exchange ventilator or indoor air introduced into the heat exchange ventilator with air from a space other than the indoors of the building, an auxiliary air duct airflow rate adjustment unit for adjusting the airflow rate of the air from the space other than the indoors flowing through the auxiliary air duct, and an auxiliary air duct airflow rate control unit for controlling the auxiliary air duct airflow rate adjustment unit. Effect of the Invention

[0009] The ventilation system according to the present disclosure has an advantage that the temperature of the air supplied to the room can be improved while saving energy. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram showing a configuration of a ventilation system according to a first embodiment. [Diagram 2]FIG. 1 is a diagram showing a functional configuration of an auxiliary airflow duct airflow adjustment unit according to a first embodiment; [Diagram 3] FIG. 1 is a block diagram showing a functional configuration related to control of an auxiliary supply airflow duct air volume adjustment unit and an auxiliary exhaust airflow duct air volume adjustment unit in a ventilation system according to a first embodiment. [Figure 4] FIG. 1 is a diagram showing a functional configuration of a terminal device according to a first embodiment; [Diagram 5] 1 is a flowchart showing a procedure for controlling the operation of an auxiliary-air-channel airflow volume adjuster in the ventilation system according to the first embodiment. [Figure 6] FIG. 1 is a diagram showing an improvement effect of the temperature of the supply air in the ventilation system according to the first embodiment. [Figure 7] FIG. 13 is a schematic diagram illustrating an example of a configuration of a ventilation system according to a second embodiment. [Figure 8] FIG. 13 is a schematic diagram illustrating an example of a configuration of a ventilation system according to a third embodiment. [Figure 9] FIG. 1 is a diagram showing a configuration in which the functions of the control unit according to the first to third embodiments are realized by hardware. [Figure 10] FIG. 1 is a diagram showing a configuration in which the functions of the control unit according to the first to third embodiments are realized by software. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, a ventilation system according to an embodiment will be described in detail with reference to the drawings. In the drawings shown below, the scale of each component may differ from the actual scale in order to facilitate understanding. The same applies to each of the drawings.

[0012] Embodiment 1 FIG. 1 is a schematic diagram showing the configuration of a ventilation system 100 according to a first embodiment. The ventilation system 100 is applied to a building 2 such as a detached house or an apartment building. FIG. 1 shows a case where the ventilation system 100 is applied to a general house and the room of the house is the ventilation target space. Arrows in FIG. 1 indicate the direction of supply air or exhaust air. The ventilation system 100 is a system for ventilating the inside of the building 2. Note that the symbol OA indicates outdoor air, the symbol SA indicates supply air, the symbol RA indicates return air, the symbol RA indicates return air, the symbol EA indicates exhaust air, the symbol EA indicates air discharged to the outside.

[0013] The interior of the building 2 is divided into a plurality of spaces by partitions 201, and a plurality of rooms are provided as a plurality of spaces to be ventilated. An example of the partitions 201 is an inner wall. The upper parts of the plurality of rooms are separated from the attic space 21 by an interior ceiling board 231. The lower parts of the plurality of rooms are separated from the underfloor space 22 by a floor board 232. The sides of the plurality of rooms are separated from the outdoors by an exterior wall 233a. That is, in the building 2 shown in FIG. 1, the area above the ceiling board 231 is the attic space 21. Also, the area below the floor board 232 is the underfloor space 22. Also, the area surrounded by the ceiling board 231, the floor board 232, and the exterior wall 233a is the indoor area in which the plurality of rooms are provided.

[0014] The ceiling board 231, the floor board 232, and the exterior wall 233a are constructed using building materials, and a predetermined amount of heat insulating material is laid down for each. The ceiling board 231, the floor board 232, and the exterior wall 233a each have a structure having a predetermined airtight performance, and are assembled to each other so as to impart a predetermined airtight performance to the indoor area, thereby forming the insulated airtight section 23 in the building 2.

[0015] Thus, the indoor space is the inside of the building 2, and is the insulated and airtight compartment 23 that is covered with building materials and insulating materials and has a predetermined heat retention performance and a predetermined airtight performance against the outdoor temperature environment. In other words, the indoor space is a region within the insulated and airtight compartment that belongs to the inside of the insulated and airtight compartment 23.

[0016] The attic space 21 is an area surrounded by a ceiling board 231, an exterior wall 233b, and a roof 234. The ceiling board 231 is made of building materials and has a predetermined amount of heat insulating material laid therein. The exterior wall 233b and the roof 234 are made of building materials and have no heat insulating material laid therein.

[0017] The exterior wall 233b surrounding the attic space 21 includes an attic outdoor air communication section 25 that is an outdoor air communication section that connects the outdoors with the attic space 21 and ensures a certain amount of ventilation between the outdoors and the attic space 21. In addition, the exterior wall 233b surrounding the attic space 21 has an outdoor air intake port 172 and an exhaust port 162 formed therein.

[0018] Thus, the attic space 21 is a space other than the indoor space inside the building 2, and is an area outside the insulated airtight compartment that is a compartment outside the insulated airtight compartment 23 and communicates with the outdoors. In other words, the attic space 21 belongs to the outside of the insulated airtight compartment 23. The attic space 21, which is an area outside the insulated airtight compartment, has a temperature difference depending on the season or time of day with respect to both the outdoors and the insulated airtight compartment 23.

[0019] The underfloor space 22 is an area surrounded by the indoor floorboards 232, the exterior wall 233b, and the foundation 235. The floorboards 232 are made of building materials, and a predetermined amount of heat insulating material is laid on them. The exterior wall 233b and the foundation 235 are made of building materials, and no heat insulating material is laid on them. The exterior wall 233b is provided with an underfloor outdoor air communication part 24, which is an outdoor air communication part that communicates with the outdoors and ensures a certain amount of ventilation between the underfloor space 22 and the outdoors.

[0020] Thus, the underfloor space 22 is a space other than the indoor space inside the building 2, and is an area outside the insulated airtight compartment that is a compartment outside the insulated airtight compartment 23 and communicates with the outdoors. In other words, the underfloor space 22 belongs to the outside of the insulated airtight compartment 23. The underfloor space 22, which is an area outside the insulated airtight compartment, has a temperature difference with respect to both the outdoors and the insulated airtight compartment 23 depending on the season or time of day.

[0021] 1 shows a case where a plurality of rooms provided in the indoor heat-insulated airtight compartment 23 of the building 2 are a living-dining-kitchen (LDK) 202A, a living room 202B, and a toilet 202C. In addition, a partition 201 separating each room is provided with an air vent 201a that connects adjacent rooms.

[0022] The ventilation system 100 includes a heat exchange ventilator 1. The heat exchange ventilator 1 is a ventilation device provided in an attic space 21. The heat exchange ventilator 1 includes a housing 101. The heat exchange ventilator 1 includes a heat exchanger 11, an intake air blower 13, an exhaust air blower 12, an intake air filter 15, and an exhaust air filter 14 inside the housing 101. In the following description, when there is no need to distinguish between the intake air filter 15 and the exhaust air filter 14, they may be simply referred to as filters.

[0023] The housing 101 is made of sheet metal and has a rectangular parallelepiped shape. As shown in FIG. 1, the housing 101 includes an outside air inlet 102 and an exhaust outlet 103 arranged side by side on one end surface 101a of the housing 101 in the longitudinal direction. The housing 101 includes an air supply outlet 104 and an indoor air inlet 105 arranged side by side on the other end surface 101b opposite to the one end surface 101a in the longitudinal direction of the housing 101. The housing 101 includes air supply ducts 17a and 17b therein, which are air supply ducts of the heat exchange ventilator 1 that connect the outside air inlet 102 and the air supply outlet 104 via the heat exchanger 11. The housing 101 also includes exhaust ducts 16a and 16b therein, which are exhaust ducts of the heat exchange ventilator 1 that connect the indoor air inlet 105 and the exhaust outlet 103 via the heat exchanger 11.

[0024] The supply air duct of the heat exchanger ventilator 1 also includes an supply air duct in a heat exchanger 11, which will be described later. The exhaust air duct of the heat exchanger ventilator 1 also includes an exhaust air duct in a heat exchanger 11, which will be described later.

[0025] The intake air duct 17a is an intake air duct upstream of the heat exchanger 11 among the intake air ducts of the heat exchanger ventilator 1, i.e., an intake air duct upwind of the heat exchanger 11 among the intake air ducts of the heat exchanger ventilator 1. The intake air duct 17b is an intake air duct downstream of the heat exchanger 11 among the intake air ducts of the heat exchanger ventilator 1, i.e., an intake air duct downwind of the heat exchanger 11 among the intake air ducts of the heat exchanger ventilator 1. The exhaust air duct 16a is an exhaust air duct upstream of the heat exchanger 11 among the exhaust air ducts of the heat exchanger ventilator 1, i.e., an exhaust air duct upwind of the heat exchanger 11 among the exhaust air ducts of the heat exchanger ventilator 1. The exhaust air duct 16b is an exhaust air duct downstream of the heat exchanger 11 among the exhaust air ducts of the heat exchanger ventilator 1, i.e., an exhaust air duct downwind of the heat exchanger 11 among the exhaust air ducts of the heat exchanger ventilator 1.

[0026] Housing 101 has partition plate 106a which is a partition plate that separates exhaust airflow path 16a and supply airflow path 17b within housing 101. Housing 101 has partition plate 106b which is a partition plate that separates exhaust airflow path 16b and supply airflow path 17a within housing 101.

[0027] The heat exchanger 11 exchanges heat between exhaust air, which is air exhausted from indoors to outdoors, and supply air, which is air taken in from outdoors to indoors. That is, the heat exchanger 11 is a heat exchanger that exchanges heat between outside air, which is outdoor air introduced into the interior of the building 2 from the outside of the building 2 via the heat exchange ventilator 1, and indoor air exhausted from the interior of the building 2 to the outside of the building 2 via the heat exchange ventilator 1. The heat exchanger 11 simultaneously exhausts and supplies air between the exterior and interior of the building 2, and exchanges heat between the outdoor air drawn in from the exterior of the building 2 and the indoor air drawn in from within the interior of the building 2.

[0028] Specifically, heat exchanger 11 exchanges heat between supply air flowing from supply air passage 17a to supply air passage 17b and exhaust air flowing from exhaust air passage 16a to exhaust air passage 16b. In one example, heat exchanger 11 has a structure in which the exhaust air passage and the supply air passage are stacked and cross each other. Heat exchanger 11 is disposed in housing 101 such that supply air passages 17a and 17b provided in housing 101 are connected to the supply air passage of heat exchanger 11, and exhaust air passages 16a and 16b provided in housing 101 are connected to the exhaust air passage of heat exchanger 11.

[0029] The air supply fan 13 is provided in the air supply duct 17b, which is an air duct downstream of the heat exchanger 11, of the air supply duct of the heat exchange ventilator 1, and generates an air flow from the outdoors to the indoors. Specifically, the air supply fan 13 generates an air supply flow from the inlet end to the outlet end of the air supply duct of the heat exchange ventilator 1, that is, an air supply flow from the outside air inlet 102 to the air supply outlet 104. The air supply fan 13 operates to generate an air supply flow, and the outside air, which is the outdoor air, can be taken into the room via the heat exchange ventilator 1. That is, the air supply fan 13 is a fan that blows air for heat exchange air supply, which draws in the outside air from the outside of the building 2 and sends the outside air after heat exchange into the room. In the example of FIG. 1, the air supply fan 13 is provided in the air supply duct 17b, but the air supply fan 13 can also be provided in the air supply duct 17a. The supply air blower 13 has a fan (not shown) and a motor (not shown) that drives the fan.

[0030] The exhaust fan 12 is provided in the exhaust air duct 16b downstream of the heat exchanger 11 in the exhaust air duct of the heat exchange ventilator 1, and generates an air flow from indoors to outdoors. Specifically, the exhaust fan 12 generates an exhaust flow from the inlet end to the outlet end of the exhaust air duct of the heat exchange ventilator 1, that is, an exhaust flow from the indoor air inlet 105 to the exhaust outlet 103. By operating the exhaust fan 12, an exhaust flow is generated, and indoor air can be discharged to the outdoors via the heat exchange ventilator 1. That is, the exhaust fan 12 is a fan that performs air blowing for heat exchange exhaust, which draws in air inside the building 2 and sends and discharges the air inside the building 2 after heat exchange to the outside of the building 2. In the example of FIG. 1, the exhaust fan 12 is provided in the exhaust air duct 16b, but the exhaust fan 12 can also be provided in the exhaust air duct 16a. The exhaust blower 12 has a fan (not shown) and a motor (not shown) that drives the fan.

[0031] The intake air filter 15 is an air filter that removes contaminants from the outside air drawn into the heat exchanger 11 to purify the outside air in order to prevent a decrease in the performance of the heat exchanger 11 due to clogging caused by contaminants such as dust, pollen, and fine particulate matter contained in the outside air when the outside air is introduced into the room. That is, the intake air filter 15 is a filter that purifies the air drawn into the heat exchanger 11. The intake air filter 15 is installed for the purpose of preventing a decrease in the air flow rate of the outside air drawn into the room and a decrease in the heat exchange efficiency of the heat exchanger 11, which are caused mainly by contaminants such as dust, pollen, and fine particulate matter contained in the outside air adhering to the heat exchanger 11. Fine particulate matter is also called PM (Particulate Matter) 2.5. The outside air taken into the heat exchange ventilation device 1 passes through the intake air filter 15, and some of the contaminants contained therein are removed. The intake air filter 15 is detachably disposed in the intake air passage 17a at a position near the heat exchanger 11.

[0032] Another effect of intake air filter 15 is to suppress deterioration due to dirt caused by contaminants contained in the outside air in the intake air duct located downstream of the installation position of intake air filter 15 in intake air duct 17a, and in components located downstream of the installation position of intake air filter 15 in the intake air duct. For this reason, intake air filter 15 is preferably installed as upstream as possible in the intake air duct of heat exchange ventilator 1.

[0033] In the heat exchange ventilator 1, the intake air filter 15 is disposed in the intake air duct 17a, which is on the windward side of the heat exchanger 11, in the intake air duct of the heat exchange ventilator 1. That is, in the ventilation system 100, the intake air filter 15 is disposed in the intake air duct of the heat exchange ventilator 1 at the most upstream position in the flow direction of the intake air flow among the intake air filter 15, the heat exchanger 11, and the intake air blower 13, which are components disposed in the intake air duct. This provides an effect of suppressing deterioration due to dirt caused by pollutants contained in the outside air of the intake air duct downstream of the installation position of the intake air filter 15 in the intake air duct of the heat exchange ventilator 1, and the heat exchanger 11 and the intake air blower 13, which are components disposed downstream of the installation position of the intake air filter 15 in the intake air duct.

[0034] In addition, in the ventilation system 100, the intake air duct 17d and the intake air vents 173a, 173b, which are described later and are components located downstream of the installation position of the intake air filter 15 in the intake air duct, which will be described later, also have the effect of suppressing deterioration due to dirt caused by pollutants contained in the outside air.

[0035] In addition, in the heat exchange ventilation device 1, one intake air filter 15 is installed in a position near the heat exchanger 11, but multiple types of intake air filters 15 may be used corresponding to the pollutants to be removed by the intake air filter 15.

[0036] The exhaust filter 14 is an air filter that purifies the indoor air by removing contaminants from the indoor air drawn into the heat exchanger 11 in order to prevent a decrease in the performance of the heat exchanger 11 caused by clogging of the heat exchanger 11 by contaminants such as dust contained in the indoor air when the indoor air is exhausted to the outdoors. That is, the exhaust filter 14 is a filter that purifies the air drawn into the heat exchanger 11. The exhaust filter 14 is installed mainly for the purpose of preventing a decrease in the air flow rate of the indoor air exhausted to the outdoors and a decrease in the heat exchange efficiency of the heat exchanger 11 caused by contaminants such as dust contained in the indoor air adhering to the heat exchanger 11. The indoor air taken in by the heat exchange ventilator 1 passes through the exhaust filter 14, and some of the contaminants contained therein are removed. The exhaust filter 14 is installed in a position near the heat exchanger 11 in the exhaust air duct 16a so as to be freely removable.

[0037] Another effect of exhaust filter 14 is that it suppresses deterioration due to dirt caused by contaminants contained in the indoor air in the exhaust air duct located downstream of the installation position of exhaust filter 14 in exhaust air duct 16a, and in components located downstream of the installation position of exhaust filter 14 in the exhaust air duct. For this reason, exhaust filter 14 is preferably installed as upstream as possible in the exhaust air duct of heat exchange ventilator 1.

[0038] In the heat exchange ventilation device 1, the exhaust filter 14 is disposed in the exhaust air duct 16a, which is on the windward side of the heat exchanger 11, in the exhaust air duct of the heat exchange ventilation device 1. That is, in the heat exchange ventilation device 1, the exhaust filter 14 is disposed in the exhaust air duct of the heat exchange ventilation device 1 at the most upstream position in the flow direction of the airflow among the exhaust filter 14, the heat exchanger 11, and the exhaust fan 12, which are components disposed in the exhaust air duct. As a result, in the heat exchange ventilation device 1, the effect of suppressing deterioration due to dirt caused by pollutants contained in the indoor air of the exhaust air duct located downstream of the installation position of the exhaust filter 14 in the exhaust air duct of the heat exchange ventilation device 1, and the heat exchanger 11 and the exhaust fan 12, which are components disposed downstream of the installation position of the exhaust filter 14 in the exhaust air duct, is obtained.

[0039] In addition, in the ventilation system 100, the exhaust duct 16d and the exhaust port 162, which are components located downstream of the installation position of the exhaust filter 14 in the exhaust air duct described below, also have the effect of suppressing deterioration due to dirt caused by pollutants contained in the indoor air.

[0040] In addition, in the heat exchange ventilation device 1, one exhaust filter 14 is installed in a position near the heat exchanger 11, but multiple types of exhaust filters 14 may be used corresponding to the pollutants to be removed by the exhaust filter 14.

[0041] The ventilation system 100 includes an air supply duct 17c, an auxiliary air supply duct air regulator 174, an auxiliary air supply duct 171, and an auxiliary air supply duct air volume adjuster 19.

[0042] The supply air duct 17c connects between the outside air intake 172 of the outer wall 233b and the outside air inlet 102 of the heat exchange ventilator 1. The outdoor air taken in through the outside air intake 172 of the outer wall 233b flows through the supply air duct 17c and is introduced into the outside air inlet 102 of the heat exchange ventilator 1.

[0043] The auxiliary air supply duct air control port 174 is an air control port arranged inside the attic space 21, and is an air supply duct suction port for drawing in air from the attic space 21. If the outside air intake port 172 of the exterior wall 233b is the first air supply duct suction port, the auxiliary air supply duct air control port 174 can be said to be the second air supply duct suction port.

[0044] The auxiliary supply air duct 171 is an air duct for supply air that connects the auxiliary supply air duct air control port 174 and the supply air duct 17c, and is constituted by a duct. That is, the auxiliary supply air duct 171 is an air duct that branches from the supply air duct 17c and leads to the auxiliary supply air duct air control port 174. The air of the attic space 21 sucked from the auxiliary supply air duct air control port 174 flows through the auxiliary supply air duct 171 and flows into the supply air duct 17c. That is, the air of the attic space 21 sucked from the auxiliary supply air duct air control port 174 is mixed with the outdoor air flowing through the supply air duct 17c. That is, the auxiliary supply air duct 171 is an auxiliary air duct that mixes the outdoor air introduced into the heat exchange ventilator 1 with the air of a space other than the room in the building 2.

[0045] If the air supply duct 17c that introduces outdoor air to the outside air inlet 102 of the heat exchanger ventilator 1 is defined as the first air supply duct to the heat exchanger ventilator 1, the auxiliary air supply duct 171 can be said to be the second air supply duct to the heat exchanger ventilator 1.

[0046] The auxiliary air supply duct air volume adjustment unit 19 is provided in the auxiliary air supply duct 171 and adjusts the volume of air in the attic space 21 that flows through the auxiliary air supply duct 171.

[0047] The structure of auxiliary air supply duct air volume adjustment section 19 is not limited as long as it can adjust the volume of air in attic space 21 flowing through auxiliary air supply duct 171. The structure of auxiliary air supply duct air volume adjustment section 19 may be, for example, a structure that uses a damper structure to block or open the ventilation in auxiliary air supply duct 171, a structure that uses a blower to generate an air current that flows through auxiliary air supply duct 171, or a structure that combines these structures.

[0048] The ventilation system 100 also includes an air supply / restriction port 173a, an air supply / restriction port 173b, and an air supply duct 17d.

[0049] The air supply / air exhaust port 173a is an air exhaust port provided in the ceiling board 231 of the LDK 202A, and is an air supply / air exhaust port for blowing out the supply airflow blown out from the air supply / air exhaust port 104 of the heat exchange ventilator 1 to the LDK 202A.

[0050] The air supply / air restrictor port 173b is an air restrictor port provided in the ceiling board 231 of the living room 202B, and is an air supply / air discharge port for discharging the supply airflow blown out from the air supply / air discharge port 104 of the heat exchange ventilator 1 into the living room 202B.

[0051] The air supply duct 17d connects the air supply restrictor 173a and the air supply restrictor 173b to the air supply discharge port 104 of the heat exchange ventilator 1. A part of the air supply flow blown out from the air supply discharge port 104 of the heat exchange ventilator 1 flows through the air supply duct 17d and is then blown out from the air supply restrictor 173a to the living room 202A. A part of the air supply flow blown out from the air supply discharge port 104 of the heat exchange ventilator 1 flows through the air supply duct 17d and is then blown out from the air supply restrictor 173b to the living room 202B.

[0052] The outdoor air intake 172 is connected to the outdoor air inlet 102 of the heat exchange ventilator 1 via the supply air path 17c, and communicates the outdoors with the heat exchange ventilator 1. The flow path from the outdoor air intake 172 to the supply air duct 17c, the supply air duct 17a, the supply air duct of the heat exchange ventilator 1, the supply air duct 17b, and the supply air duct 17d to the supply air restrictor 173a, 173b, which communicates the outdoors of the building 2 with the indoor space inside the building 2, corresponds to the supply air duct. The auxiliary supply air duct 171 also corresponds to the supply air duct.

[0053] The intake air filter 15 may be provided at a position between the branching portion of the intake air duct 17c and the auxiliary intake air duct 171 and the outside air inlet 102 of the heat exchange ventilator 1. The branching portion of the intake air duct 17c and the auxiliary intake air duct 171 may be referred to as a joint portion of the intake air duct 17c and the auxiliary intake air duct 171 or a junction portion of the intake air duct 17c and the auxiliary intake air duct 171. The intake air filter 15 may also be provided at a position between the branching portion of the intake air duct 17c and the auxiliary intake air duct 171 and the outside air inlet 172. The intake air filter 15 may also be provided at a position between the auxiliary intake air duct air control port 174 and the auxiliary intake air duct air volume adjustment unit 19.

[0054] In addition, by arranging the intake air filter 15 on the downwind side of the auxiliary intake air duct 171, the air in the attic space 21 sucked in through the auxiliary intake air duct air regulating opening 174 can be purified.

[0055] The ventilation system 100 includes an underfloor outside air communication section 24, an exhaust air intake 163, and an exhaust duct 16c.

[0056] The underfloor outdoor air communication section 24 is provided in the outer wall 233b of the building 2, and connects the outdoors with the underfloor space 22 to ensure a certain amount of ventilation between the outdoors and the underfloor space 22.

[0057] The exhaust air vent 163 is an air vent provided in the ceiling board 231 of the toilet 202C, and is an exhaust suction port for drawing in the air of the toilet 202C, which is the air in the indoor space.

[0058] The exhaust duct 16c connects the indoor air inlet 105 of the heat exchange ventilator 1 and the exhaust vent 163. The air of the toilet 202C sucked in from the exhaust vent 163 flows through the exhaust duct 16c and is introduced into the indoor air inlet 105 of the heat exchange ventilator 1.

[0059] The ventilation system 100 includes an auxiliary exhaust air passage air control port 164, an auxiliary exhaust air passage 161, and an auxiliary exhaust air passage air volume regulator 18.

[0060] The auxiliary exhaust air duct air control port 164 is an air control port arranged inside the underfloor space 22, and is an exhaust air duct suction port for drawing in air from the underfloor space 22. If the exhaust air control port 163 is considered to be a first exhaust air duct suction port, the auxiliary exhaust air duct air control port 164 can be said to be a second exhaust air duct suction port.

[0061] The auxiliary exhaust air duct 161 is an exhaust air duct that connects the auxiliary exhaust air duct air control port 164 and the exhaust duct 16c, and is formed by a duct. That is, the auxiliary exhaust air duct 161 is an air duct that branches off from the exhaust duct 16c and leads to the auxiliary exhaust air duct air control port 164. The auxiliary exhaust air duct 161 extends from the underfloor space 22 through the pipe space PS of the indoor space to the attic space 21. The air of the underfloor space 22 sucked in from the auxiliary exhaust air duct air control port 164 flows through the auxiliary exhaust air duct 161 and flows into the exhaust duct 16c. That is, the air of the underfloor space 22 sucked in from the auxiliary exhaust air duct air control port 164 is mixed with the air of the toilet 202C, which is the indoor air flowing through the exhaust duct 16c. That is, the auxiliary exhaust air duct 161 is an auxiliary air duct that mixes the indoor air introduced into the heat exchange ventilator 1 with the air of the space other than the indoor space in the building 2.

[0062] If exhaust duct 16c, which introduces indoor air into indoor air inlet 105 of heat exchanger ventilator 1, is considered to be the first exhaust air duct to heat exchanger ventilator 1, then auxiliary exhaust air duct 161 can be considered to be the second exhaust air duct to heat exchanger ventilator 1.

[0063] The auxiliary exhaust airflow volume adjustment unit 18 is provided in the auxiliary exhaust airflow duct 161 and adjusts the volume of air in the underfloor space 22 that flows through the auxiliary exhaust airflow duct 161 .

[0064] The structure of auxiliary exhaust airflow volume adjustment section 18 is not limited as long as it can adjust the volume of air in underfloor space 22 flowing through auxiliary exhaust airflow duct 161. The structure of auxiliary exhaust airflow volume adjustment section 18 may be, for example, a structure that uses a damper structure to block or open the ventilation in auxiliary exhaust airflow duct 161, a structure that uses a blower to generate an airflow that flows through auxiliary exhaust airflow duct 161, or a combination of these structures.

[0065] In the following description, when there is no need to distinguish between auxiliary supply airflow duct airflow adjustment section 19 and auxiliary exhaust airflow duct airflow adjustment section 18, they may simply be referred to as auxiliary airflow duct airflow adjustment section 30.

[0066] Fig. 2 is a diagram showing a functional configuration of auxiliary airflow adjustment unit 30 according to embodiment 1. Auxiliary airflow adjustment unit 30 includes airflow adjustment operation unit 31, adjustment communication unit 32, and adjustment control unit 33. The components of auxiliary airflow adjustment unit 30 shown in Fig. 2 can exchange information with each other.

[0067] Air volume adjustment unit 31 includes a device such as a damper or a blower, and adjusts the volume of air flowing through auxiliary air supply duct 171 or auxiliary air exhaust duct 161 .

[0068] The adjustment communication unit 32 communicates with an external device of the auxiliary-air-passage airflow adjustment unit 30. The communication method with the external device may be wired communication, or wireless communication using Wi-Fi (registered trademark) (Wireless Fidelity) or Bluetooth (registered trademark), etc.

[0069] The adjustment control unit 33 is a control unit that controls the overall operation of the auxiliary-air-passage airflow adjustment unit 30. The adjustment control unit 33 controls the operation of the airflow adjustment unit 31 based on information received from the adjustment communication unit 32.

[0070] The ventilation system 100 also includes an exhaust duct 16d that connects the exhaust outlet 103 of the heat exchange ventilator 1 and an exhaust port 162 provided in an exterior wall 233b that surrounds the attic space 21 of the building 2. The exhaust air blown out from the exhaust outlet 103 of the heat exchange ventilator 1 flows through the exhaust duct 16d and is blown out from the exhaust port 162 to the outdoors.

[0071] The exhaust port 162 is connected to the exhaust outlet 103 of the heat exchange ventilator 1 via the exhaust duct 16d, and communicates the outdoors with the heat exchange ventilator 1. The flow path from the exhaust air intake 163 to the exhaust port 162 via the exhaust duct 16c, the exhaust air duct 16a, the exhaust air duct of the heat exchange ventilator 1, the exhaust air duct 16b, and the exhaust duct 16d, which communicates the inside of the building 2 with the outdoors of the building 2, corresponds to the exhaust air duct. The auxiliary exhaust air duct 161 also corresponds to the exhaust air duct.

[0072] The exhaust filter 14 can also be provided at a position between the branching portion of the exhaust duct 16c and the auxiliary exhaust air passage 161 and the indoor air inlet 105 of the heat exchange ventilator 1. The branching portion of the exhaust duct 16c and the auxiliary exhaust air passage 161 can be said to be a joint portion of the exhaust duct 16c and the auxiliary exhaust air passage 161 or a junction portion of the exhaust duct 16c and the auxiliary exhaust air passage 161. The exhaust filter 14 can also be provided at a position between the branching portion of the exhaust duct 16c and the auxiliary exhaust air passage 161 and the exhaust air control port 163. The exhaust filter 14 can also be provided at a position between the auxiliary exhaust air passage air control port 164 and the auxiliary exhaust air passage air volume adjustment unit 18.

[0073] Furthermore, by arranging the exhaust filter 14 on the downwind side of the auxiliary exhaust air duct 161, the air in the underfloor space 22 sucked in through the auxiliary exhaust air duct air control opening 164 can be purified.

[0074] The heat exchange ventilator 1 has other components such as a communication unit, an indoor temperature sensor, and an outdoor temperature sensor, but detailed description thereof will be omitted.

[0075] 3 is a block diagram showing a functional configuration related to control of auxiliary supply airflow duct airflow adjustment unit 19 and auxiliary exhaust airflow duct airflow adjustment unit 18 in ventilation system 100 according to embodiment 1. Ventilation system 100 includes auxiliary airflow duct airflow control unit 50 that controls auxiliary airflow duct airflow adjustment unit 30.

[0076] The auxiliary air duct airflow control unit 50 includes a temperature measurement unit 51, a temperature threshold input unit 52, an alarm unit 53, a region determination unit 54, a season determination unit 55, a determination control unit 56, an indoor air temperature measurement unit 57, and an external database 58.

[0077] The components of the auxiliary airflow control unit 50 shown in Fig. 3 can exchange information with each other through communication. The components of the auxiliary airflow control unit 50 exchange information with each other by a wired system or a wireless system using Wi-Fi (registered trademark) or Bluetooth (registered trademark), etc. The determination control unit 56 and the auxiliary airflow adjustment unit 30 exchange information with each other by a wired system or a wireless system using Wi-Fi (registered trademark) or Bluetooth (registered trademark), etc.

[0078] The auxiliary airflow duct airflow control unit 50 may be provided independently for each of the auxiliary air supply duct airflow adjustment unit 19 and the auxiliary exhaust duct airflow adjustment unit 18, or may be shared by both the auxiliary air supply duct airflow adjustment unit 19 and the auxiliary exhaust duct airflow adjustment unit 18.

[0079] The temperature measurement unit 51 measures the current temperature inside the building 2, which is the current temperature Ta used to control the operation of the auxiliary supply airflow duct airflow adjustment unit 19 and the auxiliary exhaust airflow duct airflow adjustment unit 18, which are the auxiliary airflow duct airflow adjustment unit 30. The temperature measurement unit 51 includes a temperature sensor such as a thermistor, and converts the temperature inside the building 2 measured by the temperature sensor into an electric signal. The temperature measurement unit 51 transmits information about the measured temperature inside the building 2 to the determination control unit 56. The method of transmitting the temperature information from the temperature measurement unit 51 to the determination control unit 56 is not limited.

[0080] Temperature measurement unit 51 is disposed at a position where it can measure the temperature inside building 2. Examples of the positions where temperature measurement unit 51 can be disposed include a position where it can measure a typical air temperature in attic space 21, a position where it can measure a typical air temperature in underfloor space 22, near auxiliary supply air duct air control port 174, near auxiliary exhaust air duct air control port 164, a position inside supply air duct 17c on the windward side of the branching part between supply air duct 17c and auxiliary supply air duct 171, inside auxiliary supply air duct air volume adjustment unit 19, a position inside exhaust duct 16c on the windward side of the branching part between exhaust duct 16c and auxiliary exhaust air duct 161, and inside auxiliary exhaust air duct air volume adjustment unit 18.

[0081] The temperature threshold input unit 52 receives a temperature threshold value, which will be described later, input by the user and transmits the temperature threshold value to the judgment control unit 56. The temperature threshold information is input to the temperature threshold input unit 52 using an input device (not shown). The temperature threshold information can be input to the temperature threshold input unit 52 by directly specifying a numerical value such as "20°C" or "24.5°C" or by specifying a temperature range such as "standard", "high", or "low". The temperature threshold can be input to the temperature threshold input unit 52 using a dial, a switch button, or via communication from an external terminal such as a smartphone.

[0082] Furthermore, the temperature threshold input unit 52 can add a predetermined difference temperature to the indoor air temperature measured by the indoor air temperature measuring unit 57 to obtain a first temperature threshold value, which is a temperature threshold value, as described below.

[0083] The notification unit 53 notifies information related to the ventilation system 100, such as information on the operation of the operation unit 41 of the terminal device 40 described later, setting information related to the operation of the ventilation system 100, and the operating state of the ventilation system 100. The notification unit 53 acquires information on the operating state of the auxiliary supply airflow duct airflow adjustment unit 19 and the auxiliary exhaust airflow duct airflow adjustment unit 18, which are the auxiliary airflow duct airflow adjustment unit 30, from the judgment control unit 56, and notifies the user of the operating state of the auxiliary airflow duct airflow adjustment unit 30. The notification method by the notification unit 53 includes notification methods such as a lighting color of a lamp, a blinking pattern of a lamp, an alarm sound, and an audio alarm, and a method of notifying information by characters or audio at an external terminal such as a smartphone in cooperation with the external terminal. The notification unit 53 can be realized, for example, by the display unit 42 of the terminal device 40 described later.

[0084] The area determination unit 54 determines the area in which the ventilation system 100 is installed. The area determination unit 54 transmits to the season determination unit 55 area information that is information on the determined area.

[0085] The season determining unit 55 determines a seasonal condition that indicates the current season in accordance with the region determined by the region determining unit 54, that is, in accordance with the region information determined by the region determining unit 54.

[0086] The determination control unit 56 switches and controls the operation of the auxiliary-air-passage airflow adjustment unit 30 based on the seasonal conditions determined by the season determination unit 55. The determination control unit 56 can also be configured as a remote controller in combination with the temperature threshold input unit 52 and the notification unit 53.

[0087] The indoor air temperature measuring unit 57 measures the temperature of the indoor air at a predetermined period. The indoor air temperature measuring unit 57 transmits information on the indoor air temperature, which is the measurement result, to the temperature threshold input unit 52.

[0088] The external database 58 is a component that acquires and holds various kinds of information from the outside, such as information on the periphery of the ventilation system 100. The external database 58 provides the information on the periphery of the ventilation system 100 to the components of the auxiliary airflow control unit 50. The information on the periphery of the ventilation system 100 includes various kinds of information such as the outside temperature and humidity of the building 2, local weather information, seasonal information, and calendar information. The components of the auxiliary airflow control unit 50 and the external database 58 exchange information by communication. The components of the auxiliary airflow control unit 50 and the external database 58 can communicate with each other by connecting to a network or the Internet.

[0089] The ventilation system 100 also includes a terminal device 40, which is a controller having a function as an operation device for the ventilation system 100. FIG. 4 is a diagram showing a functional configuration of the terminal device 40 according to the first embodiment. As shown in FIG. 4, the terminal device 40 includes an operation unit 41, a display unit 42, a terminal communication unit 43, a terminal storage unit 44, and a terminal control unit 45. Information can be exchanged between the components of the terminal device 40 shown in FIG. 4. In the terminal device 40, a user can operate the operation unit 41 of the terminal device 40 to change settings of information related to operation, stop, and switching of the ventilation volume of the heat exchange ventilator 1, and control of the auxiliary airflow volume adjustment unit 30 with respect to the auxiliary airflow volume control unit 50, and the like.

[0090] The operation unit 41 is a functional unit operated by the user when using the ventilation system 100, has operation buttons operated by the user, and is an input unit that accepts setting operations such as a control mode from the user. The operation unit 41 accepts information such as a control mode set and input by the user using the operation buttons, and transmits operation information corresponding to the information to the terminal control unit 45. The operation unit 41 can perform operations such as changing the settings of information related to the control of the ventilation system 100.

[0091] The display unit 42 notifies information related to the ventilation system 100, such as operation information on the operation unit 41, setting information related to the operation of the ventilation system 100, and the operating state of the ventilation system 100.

[0092] The terminal communication unit 43 communicates with the heat exchange ventilator 1 and the auxiliary airflow adjustment unit 30. The communication method between the heat exchange ventilator 1 and the auxiliary airflow adjustment unit 30 and the terminal communication unit 43 may be wireless communication using Wi-Fi (registered trademark) or Bluetooth (registered trademark) or the like, or may be wired communication.

[0093] The terminal storage unit 44 is a storage unit that stores information necessary for controlling the ventilation system 100, and various information and programs used for controlling the terminal device 40 and the ventilation system 100 are stored.

[0094] The terminal control unit 45 is a control unit that controls the overall processing of the terminal device 40. The terminal control unit 45 may also have a function as a system control unit that controls the ventilation system 100. The terminal control unit 45 can exchange information with the heat exchange ventilator 1 and the auxiliary air duct air volume adjustment unit 30 via the terminal communication unit 43. That is, the terminal control unit 45 can exchange information with the heat exchange ventilator 1 and the auxiliary air duct air volume adjustment unit 30 via the terminal communication unit 43. The terminal control unit 45 can control the operation of the heat exchange ventilator 1 and the auxiliary air duct air volume adjustment unit 30 by transmitting a control command to the heat exchange ventilator 1 and the auxiliary air duct air volume adjustment unit 30.

[0095] Next, a description will be given of control of the operation of the auxiliary supply air duct airflow volume adjustment unit 19 and the auxiliary exhaust air duct airflow volume adjustment unit 18 which are the auxiliary air duct airflow volume adjustment unit 30 in the ventilation system 100. Fig. 5 is a flowchart showing a procedure for controlling the operation of the auxiliary air duct airflow volume adjustment unit 30 in the ventilation system 100 according to the first embodiment. At the start of the following processing, the auxiliary supply air duct airflow volume adjustment unit 19 and the auxiliary exhaust air duct airflow volume adjustment unit 18 are stopped in the stop mode.

[0096] First, in step S110, the seasonal conditions of the area where the ventilation system 100 is used are determined. Specifically, the season determination unit 55 determines the seasonal conditions of the area where the ventilation system 100 is used. First, the area determination unit 54 acquires information on the area where the ventilation system 100 is installed from the external database 58, and determines the area where the ventilation system 100 is installed. The area determination unit 54 transmits area information, which is information on the determined area, to the season determination unit 55. The area information is, for example, information that the area where the ventilation system 100 is used is the "Sendai area," summer conditions in the Sendai area: August and September, and winter conditions in the Sendai area: November to April.

[0097] The season determination unit 55 acquires information on the current date and time using a calendar function included in the season determination unit 55, and determines a seasonal condition that represents the current season by taking into consideration the current date and time information and the area information determined by the area determination unit 54. The season determination unit 55 determines which of the acquired seasonal conditions is a "summer condition," a "winter condition," or an "other seasonal condition." The season determination unit 55 transmits the determined seasonal condition to the determination control unit 56.

[0098] The seasonal conditions are information indicating the current season and the operating conditions of the "heat recovery mode" corresponding to the season. The seasonal conditions of the area where the ventilation system 100 is used are roughly classified into "summer conditions", "winter conditions", and "other seasonal conditions".

[0099] The summer conditions are information indicating that the current season is summer and also information indicating the operating conditions of the "heat recovery mode" corresponding to that season. The winter conditions are information indicating that the current season is winter and also information indicating the operating conditions of the "heat recovery mode" corresponding to that season. An example of a summer condition is summer condition (cooling): "Temperature above 24.5°C". An example of a winter condition is winter condition (heating): "Temperature below 18.5°C". The other seasonal conditions are information indicating that the current season is neither summer condition nor winter condition, but other season. Note that the "other seasonal conditions" do not include information indicating the operating conditions of the "heat recovery mode" corresponding to that season.

[0100] The summer and winter conditions can be set in accordance with regional conditions that indicate regions such as Hokkaido or Okinawa. For example, the temperatures in Hokkaido and Okinawa are significantly different even on the same date, so that a hot day in Okinawa may be cool in Hokkaido. In other words, even if the current season is considered to be summer in Okinawa, it may not yet be summer in Hokkaido. For this reason, the summer and winter conditions can be set in accordance with regional conditions that indicate regions such as Hokkaido or Okinawa in addition to seasonal information such as summer or winter.

[0101] In addition, the summer conditions and winter conditions can be personalized and set for each user by adding conditions such as the insulation and airtightness performance of building 2, the layout conditions of the indoor space of building 2, the orientation conditions corresponding to the direction in which building 2 faces, and the air conditioning temperature conditions corresponding to the set temperature of the air conditioner installed in the indoor space of building 2, in addition to the regional conditions.

[0102] In addition, if it is difficult for the area determination unit 54 to obtain information about the area in which the ventilation system 100 is installed from the external database 58, the user can determine the seasonal conditions himself and input them to the season determination unit 55.

[0103] If it is determined in step S110 that the seasonal conditions of the area where the ventilation system 100 is used are "summer conditions", the process proceeds to step S120. If it is determined in step S110 that the seasonal conditions of the area where the ventilation system 100 is used are "winter conditions", the process proceeds to step S190. If it is determined in step S110 that the seasonal conditions of the area where the ventilation system 100 is used are "other seasonal conditions", the auxiliary airflow control unit 50 ends a series of processes for controlling the operation of the auxiliary supply airflow duct airflow adjustment unit 19 and the auxiliary exhaust airflow duct airflow adjustment unit 18.

[0104] In step S120, a first temperature threshold T0 to be applied when the season is summer is acquired. Specifically, information on the first temperature threshold T0 is input from the temperature threshold input unit 52 to the judgment control unit 56, whereby the judgment control unit 56 acquires the first temperature threshold T0. Note that the judgment control unit 56 can store a first temperature threshold T0 corresponding to a "summer condition" and use the stored first temperature threshold T0. Then, the process proceeds to step S130.

[0105] The first temperature threshold value T0 is a temperature threshold value that is used as a reference value for the determination control unit 56 to determine whether or not the operation mode of the auxiliary-air-passage airflow adjuster 30 needs to be changed.

[0106] In step S130, the judgment control unit 56 acquires the current temperature Ta inside the building 2. Specifically, the temperature measurement unit 51 measures the current temperature Ta at a predetermined measurement position inside the building 2. The temperature measurement unit 51 transmits information on the current temperature Ta, which is the measurement result, to the judgment control unit 56. This allows the judgment control unit 56 to acquire the current temperature Ta inside the building 2. Then, the process proceeds to step S140.

[0107] The current temperature Ta is the air temperature at the location where the temperature measurement unit 51 is installed, and is a temperature to be compared with the first temperature threshold value T0 as described below. The first temperature threshold value T0 is set corresponding to the location where the temperature measurement unit 51 is installed, and is set corresponding to the location where the current temperature Ta is measured so that the determination control unit 56 can determine whether or not it is necessary to change the operation mode of the auxiliary air duct airflow adjustment unit 30. Therefore, the current temperature Ta is the current temperature inside the building 2, which, in combination with the corresponding first temperature threshold value T0, allows the determination control unit 56 to determine whether or not it is necessary to change the operation mode of the auxiliary air duct airflow adjustment unit 30.

[0108] In addition, the judgment control unit 56 can also use the temperature of a specific location to represent the temperature of another location, such as by combining the temperature measured in the underfloor space 22 with a coefficient according to the season and time of day to replace it with the temperature of the attic space 21.

[0109] In step S140, threshold value judgment is performed to judge whether the current temperature Ta is equal to or greater than the first temperature threshold value T0. Specifically, judgment control unit 56 judges whether the current temperature Ta is equal to or greater than the first temperature threshold value T0. Judgment control unit 56 judges whether the operation mode of auxiliary airflow duct airflow adjustment unit 30 needs to be changed by judging whether the current temperature Ta is equal to or greater than the first temperature threshold value T0. That is, judgment control unit 56 uses first temperature threshold value T0 and the current temperature Ta to judge whether the operation modes of auxiliary supply airflow duct airflow adjustment unit 19 and auxiliary exhaust airflow duct airflow adjustment unit 18 need to be changed.

[0110] The operation modes of auxiliary supply air duct air volume adjustment section 19 and auxiliary exhaust air duct air volume adjustment section 18 include a stop mode in which operation is stopped, and a heat recovery mode.

[0111] The heat recovery mode is an operating mode in which the air in the attic space 21 or the air in the underfloor space 22 is guided to the heat exchange ventilation device 1 through the auxiliary air duct air volume adjustment unit 30, and mixed with the outdoor air or the air in the insulated airtight compartment before heat exchange, thereby improving the temperature of the supply air SA supplied to the room from the intake and exhaust vents 173a, 173b.

[0112] In other words, the heat recovery mode of the auxiliary supply air duct airflow adjustment unit 19 in embodiment 1 is an operating mode in which the temperature of the supply air SA supplied to the room from the supply air vents 173a, 173b is improved by mixing the air in the attic space 21 with the outdoor air before it exchanges heat with the air in the insulated airtight compartment through the auxiliary supply air duct airflow adjustment unit 19.

[0113] In addition, the heat recovery mode of the auxiliary exhaust duct airflow adjustment unit 18 in embodiment 1 is an operating mode in which the temperature of the supply air SA supplied to the room from the intake and exhaust duct airflow adjustment unit 173a, 173b is improved by mixing the air in the insulated airtight compartment with the air in the underfloor space 22 before heat exchange with the outdoor air through the auxiliary exhaust duct airflow adjustment unit 18.

[0114] When the determination control unit 56 determines that the current temperature Ta is equal to or higher than the first temperature threshold T0, it determines that it is necessary to change the operation mode of the auxiliary airflow duct airflow adjustment unit 30, that is, it is necessary to change the operation modes of the auxiliary supply airflow duct airflow adjustment unit 19 and the auxiliary exhaust airflow duct airflow adjustment unit 18. When the determination control unit 56 determines that the current temperature Ta is lower than the first temperature threshold T0, it determines that it is not necessary to change the operation mode of the auxiliary airflow duct airflow adjustment unit 30, that is, it is not necessary to change the operation modes of the auxiliary supply airflow duct airflow adjustment unit 19 and the auxiliary exhaust airflow duct airflow adjustment unit 18.

[0115] If it is determined that the current temperature Ta is equal to or greater than the first temperature threshold T0, the result in step S140 is Yes, and the process proceeds to step S150. If it is determined that the current temperature Ta is less than the first temperature threshold T0, the result in step S140 is No, and the process returns to step S130 to reacquire the current temperature Ta.

[0116] In step S150, the judgment control unit 56 operates the auxiliary air duct airflow adjustment unit 30 in a heat recovery mode under summer conditions that are applied when the season is summer. The judgment control unit 56 operates at least one of the auxiliary air supply duct airflow adjustment unit 19 and the auxiliary exhaust duct airflow adjustment unit 18 in a heat recovery mode under summer conditions that are applied when the season is summer. That is, the judgment control unit 56 performs control to change the operation mode of at least one of the auxiliary air supply duct airflow adjustment unit 19 and the auxiliary exhaust duct airflow adjustment unit 18 from the stop mode to the heat recovery mode.

[0117] The conditions for determining whether judgment control unit 56 operates either auxiliary supply air duct airflow volume adjustment unit 19 or auxiliary exhaust air duct airflow volume adjustment unit 18 in the heat recovery mode, or whether judgment control unit 56 operates both auxiliary supply air duct airflow volume adjustment unit 19 and auxiliary exhaust air duct airflow volume adjustment unit 18 in the heat recovery mode, are determined in advance and stored in judgment control unit 56. Information regarding the operating conditions of the heat recovery mode in which judgment control unit 56 operates auxiliary air duct airflow volume adjustment unit 30 is determined in advance and stored in judgment control unit 56. Then, the process proceeds to step S160.

[0118] On the other hand, if it is determined that the current temperature Ta is less than the first temperature threshold value T0, the process returns to step S130 as described above, and the operating modes of the auxiliary supply airflow duct airflow adjustment unit 19 and the auxiliary exhaust airflow duct airflow adjustment unit 18 are not changed.

[0119] By operating the auxiliary supply air duct air volume adjustment unit 19 in the heat recovery mode, the outdoor air flowing through the supply air duct 17c can be mixed with the air in the attic space 21 through the auxiliary supply air duct 171 and the auxiliary supply air duct air volume adjustment unit 19. For example, when the inside of the insulated airtight compartment is cooled by the air conditioner, the temperature of the air in the attic space 21 may be lower than the temperature of the outdoor air. In this case, by operating the auxiliary supply air duct air volume adjustment unit 19 in the heat recovery mode in step S150, the temperature of the supply air SA supplied to the room from the supply air vents 173a and 173b can be improved to be lower than when the auxiliary supply air duct air volume adjustment unit 19 is not operated in the heat recovery mode.

[0120] When the auxiliary supply air duct air volume adjustment section 19 has a damper structure, the air in the attic space 21 is sucked in through the auxiliary supply air duct air vent 174 located inside the attic space 21 by the flow of the supply air flow generated by the supply air blower 13, passes through the auxiliary supply air duct 171 and the auxiliary supply air duct air volume adjustment section 19, reaches the branching point between the supply air duct 17c and the auxiliary supply air duct 171, and is mixed with the outdoor air flowing through the supply air duct 17c.

[0121] When the auxiliary supply air duct air volume adjustment unit 19 is structured to have a blower, the auxiliary supply air duct air volume adjustment unit 19 generates an air flow from the auxiliary supply air duct air control port 174 arranged inside the attic space 21 toward the branching portion of the supply air duct 17c and the auxiliary supply air duct 171. When the auxiliary supply air duct air volume adjustment unit 19 is structured to have a blower, the air in the attic space 21 is sucked from the auxiliary supply air duct air control port 174 arranged inside the attic space 21 by the air flow generated by the auxiliary supply air duct air volume adjustment unit 19, passes through the auxiliary supply air duct 171 and the auxiliary supply air duct air volume adjustment unit 19, reaches the branching portion of the supply air duct 17c and the auxiliary supply air duct 171, and is mixed with the outdoor air flowing through the supply air duct 17c.

[0122] By operating the auxiliary exhaust airflow duct volume adjustment unit 18 in the heat recovery mode, the air in the toilet 202C, which is the indoor air flowing through the exhaust duct 16c, can be mixed with the air in the underfloor space 22 through the auxiliary exhaust airflow duct 161 and the auxiliary exhaust airflow duct volume adjustment unit 18. The air in the underfloor space 22 has a lower temperature than the outdoor air temperature under summer conditions and a higher temperature under winter conditions due to heat transfer from the foundation 235 in contact with the ground. Therefore, by operating the auxiliary exhaust airflow duct volume adjustment unit 18 in the heat recovery mode in step S150, the temperature of the supply air SA supplied into the room from the intake and exhaust vents 173a and 173b can be improved to be lower than when the auxiliary exhaust airflow duct volume adjustment unit 18 is not operated in the heat recovery mode.

[0123] In step S160, with the auxiliary airflow duct airflow adjustment unit 30 operating in the heat recovery mode, the judgment control unit 56 acquires the current temperature Ta. That is, with at least one of the auxiliary supply airflow duct airflow adjustment unit 19 and the auxiliary exhaust airflow duct airflow adjustment unit 18 operating in the heat recovery mode, the judgment control unit 56 acquires the current temperature Ta again. The acquisition of the current temperature Ta by the judgment control unit 56 is performed in the same manner as in step S130 described above. Then, the process proceeds to step S170.

[0124] In step S170, threshold judgment is performed to judge whether the current temperature Ta is less than (first temperature threshold T0-differential temperature Tb), which is the second temperature threshold in the heat recovery mode under summer conditions that is applied when the season is summer. Specifically, judgment control unit 56 judges whether the current temperature Ta is less than (first temperature threshold T0-differential temperature Tb). Judgment control unit 56 judges whether the operation mode of auxiliary air passage airflow adjustment unit 30 needs to be changed by judging whether the current temperature Ta is less than (first temperature threshold T0-differential temperature Tb). That is, judgment control unit 56 judges whether the operation modes of auxiliary supply air passage airflow adjustment unit 19 and auxiliary exhaust air passage airflow adjustment unit 18 need to be changed by judging whether the current temperature Ta is less than (first temperature threshold T0-differential temperature Tb). The change in operation mode here is a change from the heat recovery mode to the stop mode.

[0125] The second temperature threshold in the heat recovery mode under summer conditions is a temperature that fluctuates from the first temperature threshold by a predetermined difference temperature, and is a temperature threshold that is used as a reference value for the judgment control unit 56 to judge whether or not it is necessary to change the operating mode of the auxiliary air duct airflow adjustment unit 30 under summer conditions.

[0126] The second temperature threshold value in the heat recovery mode under summer conditions, which is applied when the season is summer, (first temperature threshold value T0-differential temperature Tb) is a reference value used by the determination control unit 56 to determine whether or not it is necessary to change the operation mode of the auxiliary air-flow duct airflow adjustment unit 30, and is a temperature lower than the first temperature threshold value T0 by a predetermined differential temperature Tb. The differential temperature Tb is set according to the detection accuracy of the temperature measurement unit 51, and is a value provided so that the heat recovery mode of the auxiliary air-flow duct airflow adjustment unit 30 does not immediately end due to a detection error of the temperature measurement unit 51 in step S180 described later.

[0127] If it is determined that the current temperature Ta is less than the second temperature threshold (first temperature threshold T0-differential temperature Tb), the result is Yes in step S170 and the process proceeds to step S180. If it is determined that the current temperature Ta is equal to or greater than the second temperature threshold (first temperature threshold T0-differential temperature Tb), the result is No in step S170 and the process returns to step S160 to reacquire the current temperature Ta.

[0128] In step S180, the determination control unit 56 ends the heat recovery mode of the auxiliary duct airflow adjustment unit 30. That is, the determination control unit 56 changes the operation mode of the auxiliary duct airflow adjustment unit 30 from the heat recovery mode to the stop mode. Through the above processing, the series of processes for controlling the operation of the auxiliary duct airflow adjustment unit 30 is completed.

[0129] In step S190, a first temperature threshold value T0 for winter conditions that are applied when the season is winter is acquired. Specifically, information on the first temperature threshold value T0 is input from the temperature threshold value input unit 52 to the judgment control unit 56, whereby the judgment control unit 56 acquires the first temperature threshold value T0. Note that the judgment control unit 56 can store the first temperature threshold value T0 corresponding to the "winter conditions" and use the stored first temperature threshold value T0. Then, the process proceeds to step S200.

[0130] In step S200, the determination control unit 56 acquires the current temperature Ta inside the building 2. The determination control unit 56 acquires the current temperature Ta in the same manner as in step S130 described above. Then, the process proceeds to step S210.

[0131] In step S210, a threshold determination is performed to determine whether the current temperature Ta is equal to or lower than the first temperature threshold T0. Specifically, the determination control unit 56 determines whether the current temperature Ta is equal to or lower than the first temperature threshold T0. The determination control unit 56 determines whether or not it is necessary to change the operation mode of the auxiliary airflow duct airflow adjustment unit 30 by determining whether the current temperature Ta is equal to or lower than the first temperature threshold T0. That is, the determination control unit 56 uses the first temperature threshold T0 and the current temperature Ta to determine whether or not it is necessary to change the operation modes of the auxiliary supply airflow duct airflow adjustment unit 19 and the auxiliary exhaust airflow duct airflow adjustment unit 18.

[0132] When the determination control unit 56 determines that the current temperature Ta is equal to or lower than the first temperature threshold value T0, it determines that it is necessary to change the operation mode of the auxiliary airflow duct airflow adjustment unit 30, that is, it is necessary to change the operation modes of the auxiliary supply airflow duct airflow adjustment unit 19 and the auxiliary exhaust airflow duct airflow adjustment unit 18. When the determination control unit 56 determines that the current temperature Ta is greater than the first temperature threshold value T0, it determines that it is not necessary to change the operation mode of the auxiliary airflow duct airflow adjustment unit 30, that is, it is not necessary to change the operation modes of the auxiliary supply airflow duct airflow adjustment unit 19 and the auxiliary exhaust airflow duct airflow adjustment unit 18.

[0133] If it is determined that the current temperature Ta is equal to or lower than the first temperature threshold T0, the result in step S210 is Yes, and the process proceeds to step S220. If it is determined that the current temperature Ta is greater than the first temperature threshold T0, the result in step S210 is No, and the process returns to step S200 to reacquire the current temperature Ta.

[0134] In step S220, the judgment control unit 56 operates the auxiliary air duct airflow volume adjustment unit 30 in a heat recovery mode under winter conditions that are applied when the season is winter. The judgment control unit 56 operates at least one of the auxiliary air supply duct airflow volume adjustment unit 19 and the auxiliary exhaust duct airflow volume adjustment unit 18 in a heat recovery mode under winter conditions that are applied when the season is winter. That is, the judgment control unit 56 performs control to change the operation mode of at least one of the auxiliary air supply duct airflow volume adjustment unit 19 and the auxiliary exhaust duct airflow volume adjustment unit 18 from the stop mode to the heat recovery mode.

[0135] The conditions for determining whether judgment control unit 56 operates either auxiliary supply air duct airflow volume adjustment unit 19 or auxiliary exhaust air duct airflow volume adjustment unit 18 in the heat recovery mode, or whether judgment control unit 56 operates both auxiliary supply air duct airflow volume adjustment unit 19 and auxiliary exhaust air duct airflow volume adjustment unit 18 in the heat recovery mode, are determined in advance and stored in judgment control unit 56. Information regarding the operating conditions of the heat recovery mode in which judgment control unit 56 operates auxiliary air duct airflow volume adjustment unit 30 is determined in advance and stored in judgment control unit 56. Then, the process proceeds to step S230.

[0136] On the other hand, if it is determined that the current temperature Ta is greater than the first temperature threshold T0, the process returns to step S200 as described above, and the operating modes of the auxiliary supply airflow duct airflow adjustment unit 19 and the auxiliary exhaust airflow duct airflow adjustment unit 18 are not changed.

[0137] In step S230, the judgment control unit 56 acquires the current temperature Ta while the auxiliary airflow duct volume adjuster 30 is operating in the heat recovery mode. That is, while at least one of the auxiliary supply airflow duct volume adjuster 19 and the auxiliary exhaust airflow duct volume adjuster 18 is operating in the heat recovery mode, the judgment control unit 56 acquires the current temperature Ta again. The judgment control unit 56 acquires the current temperature Ta in the same manner as in step S200 described above, that is, in the same manner as in step S130. Then, the process proceeds to step S240.

[0138] In step S240, threshold judgment is performed to judge whether the current temperature Ta is greater than (first temperature threshold T0+differential temperature Tb), which is the second temperature threshold in the heat recovery mode under winter conditions that is applied when the season is winter. Specifically, judgment control unit 56 judges whether the current temperature Ta is greater than (first temperature threshold T0+differential temperature Tb). Judgment control unit 56 judges whether the operation mode of auxiliary air passage airflow adjustment unit 30 needs to be changed by judging whether the current temperature Ta is greater than (first temperature threshold T0+differential temperature Tb). That is, judgment control unit 56 judges whether the operation modes of auxiliary supply air passage airflow adjustment unit 19 and auxiliary exhaust air passage airflow adjustment unit 18 need to be changed by judging whether the current temperature Ta is greater than (first temperature threshold T0+differential temperature Tb). The change in operation mode here is a change from the heat recovery mode to the stop mode.

[0139] The second temperature threshold in the heat recovery mode under winter conditions is a temperature that varies from the first temperature threshold by a predetermined difference temperature, and is a temperature threshold that is used as a reference value for the judgment control unit 56 to judge whether or not it is necessary to change the operating mode of the auxiliary air duct airflow adjustment unit 30 under winter conditions.

[0140] The second temperature threshold value (first temperature threshold value T0+differential temperature Tb) in the heat recovery mode under winter conditions, which is applied when the season is winter, is a reference value for the determination control unit 56 to determine whether or not it is necessary to change the operation mode of the auxiliary air duct airflow adjustment unit 30, and is a temperature higher than the first temperature threshold value T0 by a predetermined differential temperature Tb. The differential temperature Tb here is set according to the detection accuracy of the temperature measurement unit 51, and is a value provided so that the heat recovery mode of the auxiliary air duct airflow adjustment unit 30 does not immediately end due to a detection error of the temperature measurement unit 51 in step S250 described later.

[0141] If it is determined that the current temperature Ta is greater than the second temperature threshold (first temperature threshold T0+differential temperature Tb), then the answer is Yes in step S240 and the process proceeds to step S250. If it is determined that the current temperature Ta is equal to or less than the second temperature threshold (first temperature threshold T0+differential temperature Tb), then the answer is No in step S240 and the process returns to step S230 to reacquire the current temperature Ta.

[0142] In step S250, the determination control unit 56 ends the heat recovery mode of the auxiliary duct airflow adjustment unit 30. That is, the determination control unit 56 changes the operation mode of the auxiliary duct airflow adjustment unit 30 from the heat recovery mode to the stop mode. Through the above processing, the series of processes for controlling the operation of the auxiliary duct airflow adjustment unit 30 is completed.

[0143] The first temperature threshold value T0 in step S190 may be the same as that in the "summer conditions", or may be set under conditions other than the "summer conditions".

[0144] In steps S140, S170, S210 and S240, when it is determined that "the operating mode should not be changed," the period until returning to the previous step and having the temperature measurement unit 51 remeasure the current temperature Ta can be set within the processing capacity of the determination control unit 56 so as not to adversely affect user use.

[0145] Fig. 6 is a diagram showing the effect of improving the temperature of the supply air SA in the ventilation system 100 according to the first embodiment. Fig. 6 shows the temperature of the supply air SA under four conditions: "no mixing", "RA 50%, "OA 90%, "RA (summer) + OA (winter)". The performance of the heat exchange ventilator 1 used is a temperature exchange efficiency of 85% during heating, an enthalpy exchange efficiency of 79% during heating, a temperature exchange efficiency of 85% during cooling, and an enthalpy exchange efficiency of 77% during cooling.

[0146] "RA50%" is a condition in which the auxiliary exhaust duct airflow adjustment unit 18 is operated in "heat recovery mode" and indoor air is taken into the heat exchanger 11 with a ratio of the volume of indoor air introduced from the exhaust air duct vent 163 to the volume of air from the underfloor space 22 introduced from the auxiliary exhaust air duct vent 164 being 5:5.

[0147] "OA90%" is a condition in which the auxiliary supply air duct air volume adjustment unit 19 is operated in "heat recovery mode" so that outdoor air is taken into the heat exchanger 11 with a ratio of 1:9 between the volume of outdoor air introduced from the outside air intake 172 and the volume of air from the attic space 21 introduced from the auxiliary supply air duct air control vent 174.

[0148] "No mixing" is the case where the auxiliary air duct adjustment unit 30, which is the auxiliary supply air duct airflow adjustment unit 19 and the auxiliary exhaust air duct airflow adjustment unit 18, are not operated in "heat recovery mode", and this is the condition where outdoor air is taken into the heat exchanger 11 with the ratio of the volume of outdoor air introduced from the outside air intake 172 to the volume of air from the attic space 21 introduced from the auxiliary supply air duct air regulating vent 174 being 10:0.

[0149] "RA (summer) + OA (winter)" is the condition when operating at "RA 50%" in summer and "OA 90%" in winter.

[0150] In winter, when auxiliary supply air duct airflow adjustment unit 19 is operated in "heat recovery mode" under the condition of "OA 90%", the temperature of the supply air SA can be increased by 0.4°C compared to the case of "no mixing" when not operating in "heat recovery mode". Also, in summer, when auxiliary exhaust air duct airflow adjustment unit 18 is operated in "heat recovery mode" under the condition of "RA 50%", the temperature of the supply air SA can be decreased by 3.6°C compared to the case of "no mixing" when not operating in "heat recovery mode".

[0151] Therefore, from FIG. 6, it can be seen that in ventilation system 100, by operating auxiliary-air-channel airflow adjuster 30 in "heat recovery mode", the temperature of supply air SA supplied into the room from intake and exhaust air openings 173a, 173b can be improved.

[0152] In the ventilation system 100 of the above-mentioned embodiment 1, an example has been described in which the auxiliary exhaust air duct air control vent 164 is provided in the underfloor space 22 and the auxiliary supply air duct air control vent 174 is provided in the attic space 21, but the auxiliary exhaust air duct air control vent 164 may also be provided in the attic space 21 and the auxiliary supply air duct air control vent 174 may be provided in the underfloor space 22.

[0153] In addition, in the ventilation system 100, only the auxiliary air supply duct air control vent 174, the auxiliary air supply duct 171, and the auxiliary air supply duct air volume adjustment unit 19 may be provided in the building 2, or only the auxiliary exhaust duct air control vent 164, the auxiliary exhaust duct 161, and the auxiliary exhaust duct air volume adjustment unit 18 may be provided in the building 2.

[0154] In the ventilation system 100 according to the first embodiment, by operating the auxiliary air duct airflow adjustment unit 30 in the "heat recovery mode", the temperature of the supply air SA supplied to the room from the intake and exhaust vents 173a, 173b can be improved in a more comfortable direction for the user compared to a case in which the auxiliary air duct airflow adjustment unit 30 is not operated in the heat recovery mode.

[0155] The air in the attic space 21 is heated by solar radiation through the roof 234 of the building 2, so that it can be used in heat recovery mode mainly in winter conditions, and the temperature of the supply air SA supplied to the room from the intake and exhaust vents 173a, 173b can be improved to make it more comfortable for the user.

[0156] On the other hand, the air in the underfloor space 22 is lower in summer and higher in winter than the outside air temperature due to heat transfer from the foundation 235 in contact with the ground, so it can be used in heat recovery mode in both summer and winter seasonal conditions, and the temperature of the supply air SA supplied to the room from the intake and exhaust vents 173a, 173b can be improved to make it more comfortable for the user. In addition, using the air in the underfloor space 22 in heat recovery mode has the effect of preventing mold growth in the underfloor space 22 by promoting drying of the underfloor space 22.

[0157] In addition, by combining the "summer conditions" and "winter conditions" to achieve energy conservation, the structure, layout, and functions of the equipment of building 2 can be combined to have the effect of reducing the power load on the air conditioning equipment and heat exchange ventilation device 1 of building 2.

[0158] As described above, the ventilation system 100 according to the first embodiment has an effect of improving the temperature of the air supplied to the room while saving energy.

[0159] Embodiment 2 7 is a diagram showing a schematic diagram of an example of the configuration of the ventilation system 100a according to the second embodiment. The ventilation system 100a according to the second embodiment differs from the ventilation system 100 according to the first embodiment in that a set of the auxiliary air supply duct air control port 174, the auxiliary air supply duct 171, and the auxiliary air supply duct air volume adjustment unit 19, and a set of the auxiliary exhaust duct air control port 164, the auxiliary exhaust duct 161, and the auxiliary exhaust duct air volume adjustment unit 18 are both provided in the underfloor space 22. The auxiliary air supply duct 171 extends from the underfloor space 22 through the pipe space PS of the indoor space to the attic space 21. The auxiliary exhaust duct 161 extends from the underfloor space 22 through the pipe space PS of the indoor space to the attic space 21.

[0160] In the above-described first embodiment, the auxiliary air supply duct air control opening 174 is an air control opening arranged inside the attic space 21, and is an air supply duct suction opening for drawing in air from the attic space 21. In the second embodiment, the auxiliary air supply duct air control opening 174 is an air control opening arranged inside the underfloor space 22, and functions as an air supply duct suction opening for drawing in air from the underfloor space 22. In the second embodiment, the auxiliary air supply duct 171 is an air flow path through which the air from the underfloor space 22 drawn in from the auxiliary air supply duct air control opening 174 flows. In the second embodiment, the auxiliary air supply duct air volume adjustment unit 19 adjusts the volume of air from the underfloor space 22 flowing through the auxiliary air supply duct 171.

[0161] In the second embodiment, air in the underfloor space 22 sucked in through the auxiliary supply air duct air control opening 174 flows through the auxiliary supply air duct 171 and into the supply air duct 17c. That is, the air in the underfloor space 22 sucked in through the auxiliary supply air duct air control opening 174 is mixed with the outdoor air flowing through the supply air duct 17c. That is, the auxiliary supply air duct 171 is an auxiliary air duct that mixes the outdoor air introduced into the heat exchange ventilator 1 with air from a space other than the indoors of the building 2.

[0162] That is, in the ventilation system 100a, by operating the auxiliary air duct airflow adjustment unit 30 in "heat recovery mode", it is possible to mix the air in the underfloor space 22 with the outdoor air flowing through the supply air duct 17c, and it is also possible to mix the air in the underfloor space 22 with the air in the toilet 202C, which is the indoor air flowing through the exhaust duct 16c.

[0163] Because the air in the underfloor space 22 is lower in summer and higher in winter than the outside air temperature due to heat transfer from the foundation 235 in contact with the ground, it can be used in heat recovery mode in both summer and winter seasonal conditions, and the temperature of the supply air SA supplied to the room from the intake and exhaust vents 173a, 173b can be improved to make it more comfortable for the user. In addition, using the air in the underfloor space 22 in heat recovery mode has the effect of preventing mold growth in the underfloor space 22 by promoting drying of the underfloor space 22.

[0164] Furthermore, even if only one of the set of the auxiliary intake air duct air control vent 174, auxiliary intake air duct 171 and auxiliary intake air duct airflow adjustment unit 19 and the set of the auxiliary exhaust air duct air control vent 164, auxiliary exhaust air duct 161 and auxiliary exhaust air duct airflow adjustment unit 18 is provided in the underfloor space 22, the effect of improving the temperature of the supply air SA supplied into the room from the intake air control vents 173a, 173b can be obtained.

[0165] Embodiment 3 8 is a diagram showing a schematic diagram of an example of the configuration of a ventilation system 100b according to embodiment 3. The ventilation system 100b according to embodiment 3 differs from the ventilation system 100 according to embodiment 1 in that a set of the auxiliary air supply duct air control port 174, the auxiliary air supply duct 171, and the auxiliary air supply duct air volume adjustment unit 19, and a set of the auxiliary exhaust duct air control port 164, the auxiliary exhaust duct 161, and the auxiliary exhaust duct air volume adjustment unit 18 are both provided in the attic space 21.

[0166] In the above-described first embodiment, the auxiliary exhaust duct air control opening 164 is an air control opening arranged inside the underfloor space 22, and is an exhaust duct suction opening for drawing in air from the underfloor space 22. In the third embodiment, the auxiliary exhaust duct air control opening 164 is an air control opening arranged inside the attic space 21, and functions as an exhaust duct suction opening for drawing in air from the attic space 21. In the third embodiment, the auxiliary exhaust duct 161 is an air flow path through which the air of the attic space 21 drawn in from the auxiliary exhaust duct air control opening 164 flows. In the third embodiment, the auxiliary exhaust duct airflow rate adjustment unit 18 adjusts the rate of air from the attic space 21 flowing through the auxiliary exhaust duct 161.

[0167] In the third embodiment, the air of the attic space 21 sucked in through the auxiliary exhaust air duct air control opening 164 flows through the auxiliary exhaust air duct 161 and into the exhaust duct 16c. That is, the air of the attic space 21 sucked in through the auxiliary exhaust air duct air control opening 164 is mixed with the air of the toilet 202C, which is the indoor air flowing through the exhaust duct 16c. That is, the auxiliary exhaust air duct 161 is an auxiliary air duct that mixes the indoor air introduced into the heat exchange ventilator 1 with the air of the space other than the indoor space in the building 2.

[0168] In other words, in the ventilation system 100b, by operating the auxiliary air duct airflow adjustment unit 30 in "heat recovery mode", it is possible to mix the air from the attic space 21 with the outdoor air flowing through the supply air duct 17c, and it is also possible to mix the air from the attic space 21 with the air from the toilet 202C, which is the indoor air flowing through the exhaust duct 16c.

[0169] The air in the attic space 21 is heated by solar radiation through the roof 234 of the building 2, so that it can be used in heat recovery mode mainly in winter conditions, and the temperature of the supply air SA supplied to the room from the intake and exhaust vents 173a, 173b can be improved to make it more comfortable for the user.

[0170] Also, for example, when the inside of the insulated airtight compartment is cooled by the cooling function of an air conditioner, the temperature of the air in the attic space 21 may become lower than the temperature of the outdoor air. In this case, by operating the auxiliary supply air duct air volume adjustment unit 19 in the heat recovery mode, the temperature of the supply air SA supplied into the room from the supply air vents 173a, 173b can be improved to be lower than when the auxiliary supply air duct air volume adjustment unit 19 is not operated in the heat recovery mode.

[0171] Furthermore, even if only one of the set of the auxiliary intake air duct air control vent 174, auxiliary intake air duct 171 and auxiliary intake air duct air volume adjustment unit 19 and the set of the auxiliary exhaust air duct air control vent 164, auxiliary exhaust air duct 161 and auxiliary exhaust air duct air volume adjustment unit 18 is installed in the attic space 21, the effect of improving the temperature of the supply air SA supplied into the room from the intake air control vents 173a, 173b can be obtained.

[0172] The configurations shown in the above embodiments are merely examples, and may be combined with other known technologies, or the embodiments may be combined with each other. Also, parts of the configurations may be omitted or modified without departing from the spirit of the invention.

[0173] Next, the hardware configuration of each of the control units 80 according to the first to third embodiments will be described. The control units 80 according to the first to third embodiments correspond to the adjustment control unit 33 of the auxiliary air passage air volume adjustment unit 30, the region determination unit 54, the season determination unit 55, and the determination control unit 56 of the auxiliary air passage air volume control unit 50. Each function of the control unit 80 according to the first to third embodiments is realized by a processing circuit. The processing circuit may be dedicated hardware, or may be a processing device that executes a program stored in a storage device.

[0174] When the processing circuit is a dedicated hardware, the processing circuit corresponds to a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an application specific integrated circuit, a field programmable gate array, or a combination of these. Figure 9 is a diagram showing a configuration in which each function of the control unit 80 according to the first to third embodiments is realized by hardware. A logic circuit 81a that realizes the function of the control unit 80 is incorporated in the processing circuit 81.

[0175] When the processing circuit 81 is a processing device, the functions of the control unit 80 are realized by software, firmware, or a combination of software and firmware.

[0176] FIG. 10 is a diagram showing a configuration in which the functions of the control unit 80 according to the first to third embodiments are realized by software. The processing circuit 81 has a processor 811 that executes a program 81b, a random access memory 812 that the processor 811 uses as a work area, and a storage device 813 that stores the program 81b. The processor 811 deploys the program 81b stored in the storage device 813 on the random access memory 812 and executes it, thereby realizing the functions of the control unit 80. The software or firmware is written in a program language and stored in the storage device 813. The processor 811 can be exemplified by a central processing unit, but is not limited to this. The storage device 813 can be a semiconductor memory such as a random access memory (RAM), a read only memory (ROM), a flash memory, an erasable programmable read only memory (EPROM), or an electrically erasable programmable read only memory (EEPROM (registered trademark)). The semiconductor memory may be a non-volatile memory or a volatile memory. Further, in addition to a semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, or a DVD (Digital Versatile Disc) can be applied to the storage device 813. The processor 811 may output data such as a calculation result to the storage device 813 for storage, or may store the data in an auxiliary storage device (not shown) via the random access memory 812. By integrating the processor 811, the random access memory 812, and the storage device 813 on one chip, the functions of the control unit 80 can be realized by a microcomputer.

[0177] The processing circuit 81 realizes the functions of the control unit 80 by reading and executing the program 81b stored in the storage device 813. It can also be said that the program 81b causes a computer to execute procedures and methods for realizing the functions of the control unit 80.

[0178] In addition, the processing circuit 81 may be configured so that some of the functions of the control unit 80 are realized by dedicated hardware, and some of the functions of the control unit 80 are realized by software or firmware.

[0179] Thus, the processing circuitry 81 can realize each of the above-described functions by hardware, software, firmware, or a combination of these.

[0180] Various aspects of the present disclosure are summarized below as appendices.

[0181] (Appendix 1) Buildings and a housing in which an exhaust air duct for exhausting indoor air of the building to the outside and an intake air duct for supplying outdoor air to the room are formed independently; an exhaust fan that is provided in the exhaust air passage and generates an exhaust flow that flows through the exhaust air passage; an intake air blower that is provided in the intake air passage and generates an intake air flow that flows through the intake air passage; a heat exchanger for exchanging heat between the intake air flow and the exhaust air flow; A heat exchange ventilation device comprising: An auxiliary air duct that mixes air from a space other than the indoor space in the building with the outdoor air introduced into the heat exchange ventilation device or the indoor air introduced into the heat exchange ventilation device; an auxiliary air passage air volume adjustment unit that adjusts the volume of air in a space other than the room flowing through the auxiliary air passage; an auxiliary airflow control unit that controls the auxiliary airflow adjustment unit; A ventilation system comprising: (Appendix 2) The building is: a heat-insulating and airtight compartment in the room, the heat-insulating and airtight compartment having a predetermined heat retention performance and a predetermined airtight performance with respect to an outdoor temperature environment; A space other than the room, which is connected to the outside and is a compartment outside the thermally insulated airtight compartment; an intake air duct air control port provided in the heat-insulated airtight compartment, through which the intake air flow that flows through the heat exchange ventilator and is supplied to the room is blown out; an exhaust air duct air control vent provided in the heat-insulated airtight compartment, into which the indoor air that flows through the heat exchange ventilator and is exhausted to the outdoors is drawn; an auxiliary air passage air control port provided in an area outside the thermally insulated airtight compartment and through which air from the area outside the thermally insulated airtight compartment flowing through the auxiliary air passage is drawn; 2. The ventilation system of claim 1, comprising: (Appendix 3) An attic space that is an area outside the thermally insulated airtight compartment and is covered by a roof, an exterior wall, and a ceiling board; A space under the floor, which is an area outside the heat-insulated airtight compartment and is covered by a floor board, an exterior wall, and a foundation; Equipped with The auxiliary air duct air control vents are provided in the attic space and the underfloor space, Mixing the outdoor air introduced into the heat exchange ventilation device or the indoor air introduced into the heat exchange ventilation device with the air in the attic space or the underfloor space; 3. The ventilation system of claim 2, (Appendix 4) A space under the floor is provided outside the heat-insulated airtight compartment and is covered by a floor board, an exterior wall, and a foundation; The auxiliary air duct air control vent is provided in the underfloor space, Mixing the air in the underfloor space with the outdoor air introduced into the heat exchange ventilation device or the indoor air introduced into the heat exchange ventilation device; 3. The ventilation system of claim 2, (Appendix 5) The insulating airtight compartment has an attic space covered by a roof, an exterior wall, and a ceiling board, The auxiliary air duct air control vent is provided in the attic space, Mixing the air in the attic space with the outdoor air introduced into the heat exchange ventilation device or the indoor air introduced into the heat exchange ventilation device; 3. The ventilation system of claim 2, (Appendix 6) The area outside the heat-insulated airtight compartment is provided with an outside air communication section that communicates with the outdoors; 6. The ventilation system according to any one of claims 2 to 5, (Appendix 7) The auxiliary air passage air volume control unit is A temperature measuring unit that measures a temperature inside the building; a determination control unit that switches an operation of the auxiliary-air-passage airflow adjustment unit when the temperature measured by the temperature measurement unit becomes equal to or higher than a predetermined first temperature threshold value; To have 7. The ventilation system according to any one of claims 1 to 6, (Appendix 8) the auxiliary airflow control unit includes a notification unit that notifies a user that the temperature measured by the temperature measurement unit has reached or exceeded the first temperature threshold; 8. The ventilation system of claim 7, (Appendix 9) the auxiliary airflow control unit includes a temperature threshold input unit to which the first temperature threshold is input; 8. The ventilation system of claim 7, (Appendix 10) An indoor air temperature measuring unit that measures the temperature of the indoor air, the temperature threshold input unit adds a predetermined difference temperature to the indoor air temperature measured by the indoor air temperature measuring unit to set the first temperature threshold; 10. The ventilation system of claim 9, (Appendix 11) The auxiliary air passage air volume control unit is When the temperature measured by the temperature measuring unit becomes equal to or higher than the first temperature threshold value, the auxiliary air passage air volume adjustment unit is operated in a heat recovery mode in which air from an area outside the thermally insulated airtight compartment is caused to flow through the auxiliary air passage; stopping the auxiliary airflow adjustment unit when the temperature measured by the temperature measurement unit exceeds a second temperature threshold value that is a temperature that has fluctuated from the first temperature threshold value by a predetermined difference temperature after operating the auxiliary airflow adjustment unit in the heat recovery mode; 8. The ventilation system of claim 7, (Appendix 12) the auxiliary air passage air volume control unit includes a season determination unit that determines a seasonal condition that represents a current season, the determination control unit changes an operating condition of the auxiliary-air-passage airflow adjustment unit in response to the seasonal condition determined by the season determination unit; 12. The ventilation system of claim 11, (Appendix 13) The auxiliary airflow control unit includes an area determination unit that determines an area in which the ventilation system is installed, the season determination unit determines a seasonal condition that represents a current season in accordance with the region determined by the region determination unit; 13. The ventilation system of claim 12, (Appendix 14) the determination control unit changes the first temperature threshold value and a second temperature threshold value, which is a temperature that has fluctuated from the first temperature threshold value by a predetermined difference temperature, in response to the seasonal condition determined by the season determination unit; 13. The ventilation system of claim 12, (Appendix 15) the temperature measuring unit is provided in an area outside the thermally insulated airtight compartment and measures a temperature in the vicinity of an auxiliary air duct air control port through which air from the area outside the thermally insulated airtight compartment flowing through the auxiliary air duct is sucked in; 8. The ventilation system of claim 7, (Appendix 16) A filter is provided for cleaning the air introduced into the heat exchanger, The filter is disposed on the downwind side of the auxiliary air duct; 16. The ventilation system according to any one of claims 1 to 15, [Explanation of symbols]

[0182] 1 heat exchange ventilation device, 2 building, 11 heat exchanger, 12 exhaust fan, 13 intake fan, 14 exhaust filter, 15 intake filter, 16a, 16b exhaust duct, 16c, 16d exhaust duct, 17a, 17b intake duct, 17c, 17d intake duct, 18 auxiliary exhaust duct air volume adjustment section, 19 auxiliary intake duct air volume adjustment section, 21 attic space, 22 underfloor space, 23 insulated airtight section, 24 underfloor outdoor air communication section, 25 attic outdoor air communication section, 30 auxiliary duct air volume adjustment section, 31 air volume adjustment operation section, 32 adjustment communication section, 33 adjustment control section, 40 terminal device, 41 operation section, 42 display section, 43 terminal communication section, 44 terminal memory section, 45 terminal control section, 50 Auxiliary air duct air volume control section, 51 temperature measurement section, 52 temperature threshold input section, 53 notification section, 54 region determination section, 55 season determination section, 56 determination control section, 57 indoor air temperature measurement section, 58 external database, 80 control section, 81 processing circuit, 81a logic circuit, 81b program, 100, 100a, 100b ventilation system, 101 housing, 101a one end face, 101b other end face, 102 outdoor air intake port, 103 exhaust outlet port, 104 supply air outlet port, 105 indoor air intake port, 106a, 106b partition plate, 161 auxiliary exhaust air duct, 162 exhaust outlet, 163 exhaust air vent, 164 auxiliary exhaust air duct air vent, 171 auxiliary supply air duct, 172 outdoor air intake port, 173a, 173b Air intake vent, 174 auxiliary air intake duct vent, 201 partition, 201a vent, 202A living-dining-kitchen, 202B living room, 202C toilet, 231 ceiling board, 232 floor board, 233a, 233b exterior wall, 234 roof, 235 foundation.

Claims

1. Buildings and a housing in which an exhaust air duct for exhausting indoor air of the building to the outside and an intake air duct for supplying outdoor air to the room are formed independently; an exhaust fan that is provided in the exhaust air passage and generates an exhaust flow that flows through the exhaust air passage; an intake air blower that is provided in the intake air passage and generates an intake air flow that flows through the intake air passage; a heat exchanger for exchanging heat between the intake air flow and the exhaust air flow; A heat exchange ventilation device comprising: An auxiliary air duct that mixes air from a space other than the indoor space in the building with the outdoor air introduced into the heat exchange ventilation device or the indoor air introduced into the heat exchange ventilation device; an auxiliary air passage air volume adjustment unit that adjusts the volume of air in a space other than the room flowing through the auxiliary air passage; an auxiliary airflow control unit that controls the auxiliary airflow adjustment unit; A ventilation system comprising:

2. The building is: a heat-insulating and airtight compartment in the room, the heat-insulating and airtight compartment having a predetermined heat retention performance and a predetermined airtight performance with respect to an outdoor temperature environment; A space other than the room, which is connected to the outside and is a compartment outside the thermally insulated airtight compartment; an intake air duct air control port provided in the heat-insulated airtight compartment, through which the intake air flow that flows through the heat exchange ventilator and is supplied to the room is blown out; an exhaust air duct air control vent provided in the heat-insulated airtight compartment, into which the indoor air that flows through the heat exchange ventilator and is exhausted to the outdoors is drawn; an auxiliary air passage air control port provided in an area outside the thermally insulated airtight compartment and through which air from the area outside the thermally insulated airtight compartment flowing through the auxiliary air passage is drawn; 2. The ventilation system according to claim 1, further comprising:

3. An attic space that is an area outside the thermally insulated airtight compartment and is covered by a roof, an exterior wall, and a ceiling board; A space under the floor, which is an area outside the heat-insulated airtight compartment and is covered by a floor board, an exterior wall, and a foundation; Equipped with The auxiliary air duct air control vents are provided in the attic space and the underfloor space, Mixing the air in the attic space or the underfloor space with the outdoor air introduced into the heat exchange ventilation device or the indoor air introduced into the heat exchange ventilation device; 3. The ventilation system according to claim 2 .

4. A space under the floor is provided outside the heat-insulated airtight compartment and is covered by a floor board, an exterior wall, and a foundation; The auxiliary air duct air control vent is provided in the underfloor space, Mixing the air in the underfloor space with the outdoor air introduced into the heat exchange ventilation device or the indoor air introduced into the heat exchange ventilation device; 3. The ventilation system according to claim 2 .

5. The insulating airtight compartment has an attic space covered by a roof, an exterior wall, and a ceiling board, The auxiliary air duct air control vent is provided in the attic space, Mixing the air in the attic space with the outdoor air introduced into the heat exchange ventilation device or the indoor air introduced into the heat exchange ventilation device; 3. The ventilation system according to claim 2 .

6. The area outside the heat-insulated airtight compartment is provided with an outside air communication section that communicates with the outdoors; 3. The ventilation system according to claim 2 .

7. The auxiliary air passage air volume control unit is A temperature measuring unit that measures a temperature inside the building; a determination control unit that switches an operation of the auxiliary-air-passage airflow adjustment unit when the temperature measured by the temperature measurement unit becomes equal to or higher than a predetermined first temperature threshold value; To have The ventilation system according to claim 1 .

8. the auxiliary airflow control unit includes a notification unit that notifies a user of information that the temperature measured by the temperature measurement unit has reached or exceeded the first temperature threshold; 8. The ventilation system according to claim 7,

9. the auxiliary airflow control unit includes a temperature threshold input unit to which the first temperature threshold is input; 8. The ventilation system according to claim 7,

10. An indoor air temperature measuring unit that measures the temperature of the indoor air, the temperature threshold input unit sets the first temperature threshold value by adding a predetermined difference temperature to the indoor air temperature measured by the indoor air temperature measuring unit; 10. The ventilation system according to claim 9,

11. The auxiliary air passage air volume control unit is operating the auxiliary air passage air volume adjustment unit in a heat recovery mode in which air from an area outside the thermally insulated airtight compartment is flowed into the auxiliary air passage based on a magnitude relationship between the temperature measured by the temperature measurement unit and the first temperature threshold value; stopping the auxiliary airflow rate adjustment unit when the temperature measured by the temperature measurement unit exceeds a second temperature threshold value, which is a temperature that has fluctuated from the first temperature threshold value by a predetermined difference temperature, in a fluctuating direction of the difference temperature, after operating the auxiliary airflow rate adjustment unit in the heat recovery mode; 8. The ventilation system according to claim 7,

12. the auxiliary air passage air volume control unit includes a season determination unit that determines a seasonal condition that represents a current season, the determination control unit changes an operating condition of the auxiliary-air-passage airflow adjustment unit in response to the seasonal condition determined by the season determination unit; The ventilation system according to claim 11,

13. The auxiliary airflow control unit includes an area determination unit that determines an area in which the ventilation system is installed, the season determination unit determines a seasonal condition that represents a current season in accordance with the region determined by the region determination unit; 13. The ventilation system according to claim 12,

14. the determination control unit changes the first temperature threshold value and a second temperature threshold value, which is a temperature that has fluctuated from the first temperature threshold value by a predetermined difference temperature, in response to the seasonal condition determined by the season determination unit; 13. The ventilation system according to claim 12,

15. the temperature measuring unit is provided in an area outside the thermally insulated airtight compartment and measures a temperature in the vicinity of an auxiliary air duct air control port through which air from the area outside the thermally insulated airtight compartment flowing through the auxiliary air duct is sucked in; 8. The ventilation system according to claim 7,

16. A filter is provided for cleaning the air introduced into the heat exchanger, The filter is disposed on the downwind side of the auxiliary air duct; The ventilation system according to claim 1 .

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