JP2020143875A - Heat exchange ventilation system - Google Patents

Abstract

To obtain a heat exchange ventilation system that can restrain overdrying of a living room while introducing outdoor clean air.SOLUTION: A heat exchange ventilation system comprises: a heat exchange ventilation device 10 comprising an air supply passage for supplying outdoor air to a living room of a building, an air exhaust passage for exhausting air of the living room to the outdoors, and a heat exchanger 13 for performing heat exchange between an air exhaust flow flowing through the air exhaust passage and an air supply flow flowing through the air supply passage, and for performing ventilation while performing the heat exchange; a humidity sensor for detecting humidity of the air of the living room when heat exchange ventilation of the living room is performed; and a control unit 14 for controlling operation of the heat exchange ventilation device 10. The control unit 14 performs control for introducing air of a bathroom into the heat exchange ventilation device 10 as the air exhaust flow and performing the heat exchange ventilation of the living room with the outdoor air and the air of the bathroom as the air exhaust flow when the humidity of the air of the living room detected by the humidity sensor is less than a predetermined first humidity threshold value.SELECTED DRAWING: Figure 2

Description

The present invention relates to a heat exchange ventilation system having a heat exchange ventilation device that exchanges heat between an exhaust flow that discharges indoor air to the outside and a supply airflow that supplies outdoor air to the room.

Conventionally, an exhaust air passage for exhausting indoor air to the outside and an air supply air passage for supplying outdoor air to the room are provided, and the exhaust flow flowing through the exhaust air passage and the air supply air flowing through the air supply air passage are provided. There is known a heat exchange ventilation device that ventilates while exchanging heat between airflows by passing the above through a heat exchange element.

In such a heat exchange ventilation device, for example, in winter when the outside air is dry, there is a problem that the indoor environment becomes overdried by continuing ventilation.

As a ventilation device capable of humidifying the room, Patent Document 1 describes an exhaust means for exhausting the air in the bathroom to the outside and an air in the living room for which the air in the living room is taken in and the air in the living room is returned to the living room. A heat exchange means in which heat is exchanged between the circulating air blowing means for circulating air and the air in the bathroom exhausted by the exhaust means and the air in the living room blown by the circulating air means via a heat exchange element. A ventilation device equipped with the above is disclosed. In the ventilation device disclosed in Patent Document 1, the indoor air can be humidified by using the high temperature and high humidity air in the bathroom.

Japanese Unexamined Patent Publication No. 2018-119731

However, in the ventilation device disclosed in Patent Document 1, since the indoor air is humidified by using the high temperature and high humidity air in the bathroom, the temperature and humidity of the indoor air can be increased, but the inhaled living room. Since the ventilation is performed to circulate and blow the air in the living room again, sufficient ventilation cannot be ensured, and adverse effects such as an increase in the carbon dioxide concentration in the indoor air and a muffled odor occur.

The present invention has been made in view of the above, and an object of the present invention is to obtain a heat exchange ventilation system capable of suppressing overdrying of a living room while introducing clean outdoor air.

In order to solve the above-mentioned problems and achieve the object, the heat exchange ventilation system according to the present invention has an air supply air passage for supplying outside air to the living room of the building and for exhausting the air in the living room to the outside. A heat exchange ventilator equipped with an exhaust air passage, a heat exchanger that exchanges heat between the exhaust flow flowing through the exhaust air passage and the air supply air flowing through the air supply air passage, and a heat exchange ventilation device that ventilates while exchanging heat. It includes a humidity sensor that detects the humidity of the air in the living room when performing heat exchange ventilation in the living room, and a control unit that controls the operation of the heat exchange ventilation device. When the humidity of the air in the living room detected by the humidity sensor is less than the predetermined first humidity threshold, the control unit takes the air in the bathroom into the heat exchange ventilator as an exhaust stream, and takes in the outside air and the air in the bathroom. Is used as the exhaust flow to control the heat exchange ventilation of the living room.

According to the heat exchange ventilation system according to the present invention, it is possible to suppress overdrying of the living room while introducing clean air outdoors.

The figure which shows the structure of the heat exchange ventilation system which concerns on Embodiment 1 of this invention. A block diagram showing a functional configuration of the heat exchange ventilation system according to the first embodiment of the present invention. Schematic diagram showing the configuration of the heat exchange ventilation system applied to the heat exchange ventilation system according to the first embodiment of the present invention. The figure which shows an example of the hardware composition of the processing circuit in Embodiment 1 of this invention. A flowchart showing an example of the operation procedure of the heat exchange ventilation system according to the first embodiment of the present invention. Schematic diagram showing the configuration of another heat exchange ventilation device 210 applicable to the heat exchange ventilation system according to the first embodiment of the present invention. A flowchart showing an example of a procedure for operating a heat exchange ventilation system using another heat exchange ventilation device according to the first embodiment of the present invention.

The heat exchange ventilation system according to the embodiment of the present invention will be described in detail below with reference to the drawings. The present invention is not limited to the following description, and can be appropriately modified without departing from the gist of the present invention. Further, in the drawings shown below, the scale of each member may differ from the actual scale for easy understanding. The same applies between the drawings.

Embodiment 1.
FIG. 1 is a diagram showing a configuration of a heat exchange ventilation system 100 according to a first embodiment of the present invention. The arrows in FIG. 1 indicate the directions of intake and exhaust. FIG. 2 is a block diagram showing a functional configuration of the heat exchange ventilation system 100 according to the first embodiment of the present invention. The heat exchange ventilation system 100 includes a heat exchange ventilation device 10, a local exhaust device 20, a temperature / humidity sensor 30, an outside air temperature sensor 40, a remote controller 50, and an air passage switching damper 60.

The heat exchange ventilation device 10, the local exhaust device 20, and the remote controller 50 are connected by a home communication line 62, and can communicate information of various kinds of information. The various types of information include information related to monitoring and operation of the heat exchange ventilation device 10, the local exhaust device 20, information on the detection results of the temperature / humidity sensor 30 and the outside air temperature sensor 40, and the like. The operating state of the heat exchange ventilation device 10 and the local exhaust device 20 can be monitored and operated through the remote controller 50.

FIG. 3 is a schematic view showing the configuration of the heat exchange ventilation device 10 applied to the heat exchange ventilation system 100 according to the first embodiment of the present invention. The heat exchange ventilator 10 is a heat exchange ventilator for air conditioning that has a heat exchanger 13 inside a housing 105 constituting the main body and supplies and exhausts air to and from each room while exchanging heat with the heat exchanger 13. is there. The heat exchange ventilation device 10 is installed in a state of being hidden in the space behind the ceiling.

The heat exchange ventilation device 10 includes an outdoor suction port 101 that takes in outside air, which is outdoor air, an indoor air outlet 102 that supplies outside air into the room, an indoor suction port 103 that takes in indoor air that is return air, and indoor air. A heat exchanger 13 which is a total heat exchanger is arranged inside a housing 105 provided with an outdoor air outlet 104 for exhausting air to the outside. The indoor air outlet 102 and the indoor suction port 103 are provided on one of the opposite side surfaces of the housing 105. The outdoor suction port 101 and the outdoor outlet 104 are provided on the other side of the housing 105 facing each other.

Ducts constituting the air passage are connected to the outdoor suction port 101, the indoor air outlet 102, the indoor suction port 103, and the outdoor air outlet 104. The outdoor air supply duct 111 is connected to the outdoor air suction port 101 and communicates with the outside via the outdoor air supply duct 111. The indoor air supply duct 112 is connected to the indoor air outlet 102 and communicates with the indoor air supply duct 112 via the indoor air supply duct 112. The indoor side exhaust duct 113 is connected to the indoor side suction port 103 and communicates with the indoor side via the indoor side exhaust duct 113. The outdoor air outlet 104 is connected to the outdoor exhaust duct 114 and communicates with the outside via the outdoor exhaust duct 114.

Further, inside the housing 105, an air supply air passage 106 and an exhaust air passage 107 provided so as to intersect each other and exchange heat in the heat exchanger 13 are formed.

The exhaust intake port of the heat exchange ventilation device 10 is provided with an exhaust intake port 71 for 24-hour ventilation opened to the toilet, corridor, washroom, etc., and an opening to the inside of the bathroom. It is installed separately from the exhaust intake port 72 for bathroom ventilation. The exhaust intake port 71 and the exhaust intake port 72 are each provided at the end of the branched indoor exhaust duct 113, and are connected to the indoor exhaust duct 113. The indoor air sucked from the exhaust intake port 71 and the exhaust intake port 72 is introduced into the heat exchange ventilation device 10 from the indoor side suction port 103 through the indoor side exhaust duct 113.

The 24-hour ventilation by the heat exchange ventilation device 10 ventilates the room for 24 hours. In the living room such as the living-dining kitchen (LDK), the Japanese-style room and the Western-style room, an air supply outlet 73 provided so as to open to the living room is arranged indoors. In the 24-hour ventilation, the indoor air sucked from the exhaust intake port 71 is introduced into the heat exchange ventilation device 10 from the indoor side suction port 103 through the indoor side exhaust duct 113, and is exhausted to the outside. Then, the outside air blown out from the indoor side air outlet 102 of the heat exchange ventilation device 10 is supplied to the living room from the air supply air outlet 73 through the indoor air supply duct 112.

In the bathroom ventilation by the heat exchange ventilation device 10, the bathroom air in the bathroom is exchanged with the outside air and exhausted to the outside. In the bathroom ventilation by the heat exchange ventilation device 10, the bathroom air sucked from the exhaust intake port 72 is introduced into the heat exchange ventilation device 10 from the indoor side suction port 103 through the indoor side exhaust duct 113, and is exhausted to the outside. .. In the heat exchange ventilation system 100, by controlling the air passage switching damper 60, it is possible to switch between a state with bathroom ventilation by the heat exchange ventilation device 10 and a state without bathroom ventilation by the heat exchange ventilation device 10. There is. Further, in the bathroom ventilation by the heat exchange ventilation device 10, the displacement of the air passage switching damper 60 can be adjusted to adjust the displacement of the bathroom air.

The heat exchange ventilation device 10 includes an air supply blower 11, an exhaust blower 12, a heat exchanger 13, and a control unit 14.

The air supply air passage 106 is an air passage for supplying outside air into the room, and is an air passage in the heat exchange ventilation device 1 connecting the outdoor suction port 101 and the indoor air outlet 102 via the heat exchanger 13. Is. The exhaust air passage 107 is an air passage for exhausting the indoor air that is the return air to the outside of the room, and is a heat exchange ventilation device 1 that connects the indoor side suction port 103 and the outdoor air outlet 104 via the heat exchanger 13. It is the inner air passage. The air supply air passage 106 and the exhaust air passage 107 are independent air passages.

An air supply blower 11 that forms an air flow is installed in the air supply air passage 106. An exhaust blower 12 that forms an exhaust flow is installed in the exhaust air passage 107. A heat exchanger 13 that exchanges heat between the supply air flow and the exhaust flow is installed in the housing 105. The operation of the air supply blower 11 and the exhaust blower 12 is controlled by the control unit 14.

In the ventilation using the heat exchanger 13 in the heat exchange ventilation device 10, by operating the air supply blower 11, the outside air is sent from the outdoor suction port 101 through the outdoor air supply duct 111 to the arrow A. It is sucked in so as to pass through the air supply air passage 106 and the heat exchanger 13, and is blown out from the indoor side air outlet 102 by the air supply air blower 11 as shown by arrow B, and is supplied to the room through the indoor side air supply duct 112. Will be done.

Further, in the ventilation using the heat exchanger 13 in the heat exchange ventilation device 10, by operating the exhaust blower 12, the indoor air is sent from the indoor side suction port 103 to the indoor side suction port 103 via the indoor side exhaust duct 113. It is sucked in as shown by the exhaust air passage 107 and the heat exchanger 13, blown out from the outdoor air outlet 104 as shown by the arrow D by the exhaust blower 12, and is supplied to the outside through the outdoor exhaust duct 114. To.

At this time, in the heat exchanger 13, heat is exchanged between the exhaust flow and the air supply, and the exhaust heat is recovered to reduce the heating / cooling load and humidify the indoor air. The operation of the exhaust blower 12 and the air supply blower 11 is controlled by the control unit 14.

The control unit 14 controls the operation of the heat exchange ventilation device 10. The control unit 14 controls the operation and stop of the air supply blower 11 and the exhaust blower 12, and changes the ventilation air volume of the heat exchange ventilation device 10 by changing the operation intensity. Further, the control unit 14 controls the operation of the entire heat exchange ventilation system 100. The control unit 14 controls the operation of the air passage switching damper 60 to control the bathroom ventilation by the heat exchange ventilation device 10. The function of controlling the bathroom ventilation by the heat exchange ventilation device 10 may be provided as a control unit independent of the control unit 14.

The control unit 14 is realized, for example, as a processing circuit having a hardware configuration shown in FIG. FIG. 4 is a diagram showing an example of the hardware configuration of the processing circuit according to the first embodiment of the present invention. When the control unit 14 is realized by the processing circuit shown in FIG. 4, the control unit 14 is realized by the processor 201 executing the program stored in the memory 202. Further, a plurality of processors and a plurality of memories may cooperate to realize the above function. Further, a part of the functions of the control unit 14 may be implemented as an electronic circuit, and the other part may be realized by using the processor 201 and the memory 202.

The local exhaust device 20 is an exhaust device that exhausts the air in the bathroom to the outside, and is an exhaust fan installed in the bathroom. The local exhaust device 20 includes an exhaust blower 21 and a control unit 22.

The exhaust blower 21 takes in the air in the bathroom and forms an exhaust flow.

The control unit 22 controls the operation of the exhaust blower 21. The control unit 22 controls the operation and stop of the exhaust blower 21 and changes the ventilation air volume of the exhaust blower 21 by changing the operating intensity.

The temperature / humidity sensor 30 detects the temperature and humidity of the indoor air, which is the exhaust flow exhausted from the room. The temperature / humidity sensor 30 detects the temperature and humidity of the indoor air at a predetermined cycle, and transmits the detection result of the indoor air temperature information and the humidity information to the control unit 14.

The installation location of the temperature / humidity sensor 30 is not particularly limited as long as it can detect the temperature and humidity of the exhausted indoor air. For example, when the temperature / humidity sensor 30 is arranged inside the housing 105 of the heat exchange ventilation device 10. In this case, the temperature / humidity sensor 30 measures the temperature and humidity of the indoor air taken into the heat exchange ventilation device 10 from the indoor suction port 103 at a position upstream of the heat exchanger 13 in the air supply air passage 106. Detect with. When the temperature / humidity sensor 30 is arranged indoors, the temperature / humidity sensor 30 detects the temperature and humidity of the indoor air taken into the heat exchange ventilation device 10 from the indoor suction port 103. In the first embodiment, the temperature / humidity sensor 30 is arranged inside the housing 105 of the heat exchange ventilation device 10.

In addition, instead of the temperature / humidity sensor 30, a temperature sensor and a humidity sensor may be provided separately.

The outside air temperature sensor 40 detects the temperature of the outside air, which is the air supply air supplied to the room. The outside air temperature sensor 40 detects the temperature of the outside air at a predetermined cycle, and transmits the information on the temperature of the outside air, which is the detection result, to the control unit 14.

The installation location of the outside air temperature sensor 40 is not particularly limited as long as it can detect the temperature of the supplied outside air. For example, the outside air temperature sensor 40 is arranged inside the housing 105 of the heat exchange ventilation device 10. In this case, the outside air temperature sensor 40 detects the temperature of the outside air taken into the inside of the heat exchange ventilation device 10 from the outdoor suction port 101 at a position upstream of the heat exchanger 13 in the exhaust air passage 107. .. When the outside air temperature sensor 40 is arranged outdoors, the outside air temperature sensor 40 detects the temperature of the outdoor outside air taken into the inside of the heat exchange ventilation device 10 from the outdoor suction port 101. In the first embodiment, the outside air temperature sensor 40 is arranged inside the housing 105 of the heat exchange ventilation device 10.

The remote controller 50 receives information such as information on the operation and stop of the heat exchange ventilation device 10 and the local exhaust device 20 and information on the ventilation air volume from the user, and receives information from the user, such as the control unit 14 of the heat exchange ventilation device 10 and the local exhaust device 20. It is transmitted to the control unit 22 through the home communication line 62. In addition, instead of the remote controller 50, it is also possible to provide a plurality of switches capable of performing the same functions as the remote controller 50. It is also possible to separately provide a controller for the heat exchange ventilation device 10 and a controller for the local exhaust device 20.

The air passage switching damper 60 switches the air passage of the exhaust air in the bathroom ventilation by the heat exchange ventilation device 10, that is, the bathroom air taken in from the exhaust intake port 72 arranged in the bathroom, and the bathroom by the heat exchange ventilation device 10. This is the first air passage switching unit that switches the presence or absence of ventilation. The air passage switching damper 60 has a state in which bathroom ventilation is performed by the heat exchange ventilation device 10 and a state in which bathroom ventilation is not performed by the heat exchange ventilation device 10 under the control of the control unit 14. , Can be switched.

That is, the air passage switching damper 60 is provided in the bathroom heat exchange ventilation air passage that introduces the bathroom air taken in from the exhaust intake port 72 into the heat exchange ventilation device 10 via the indoor side exhaust duct 113 and the indoor side suction port 103. It is possible to shift to a position for switching and a position for switching to a bathroom local ventilation air passage for introducing the air passage of the bathroom air taken in from the exhaust intake port 72 into the local exhaust duct 115. The local exhaust duct 115 constitutes a local exhaust air passage that directly exhausts the bathroom air taken in from the exhaust intake port 72 without passing through the heat exchange ventilation device 10. Further, the air passage switching damper 60 is capable of adjusting the exhaust amount of bathroom air in a state with bathroom ventilation by adjusting the displacement degree by the control of the control unit 14.

The position of the air passage switching damper 60 is not particularly limited as long as it can be switched between the state with bathroom ventilation by the heat exchange ventilation device 10 and the state without bathroom ventilation by the heat exchange ventilation device 10. The air passage switching damper 60 may be provided, for example, in the exhaust intake port 72, or may be provided in the indoor exhaust duct 113 directly connected to the exhaust intake port 72.

It should be noted that each component of the heat exchange ventilation system 100 can communicate information necessary for control with each other. The communication between the components in the heat exchange ventilation system 100 may be wired communication or wireless communication.

Next, the operation of the heat exchange ventilation system 100 will be described. FIG. 5 is a flowchart showing an example of the operation procedure of the heat exchange ventilation system 100 according to the first embodiment of the present invention.

First, in step S10, the power of the heat exchange ventilation device 10 is turned on, and the 24-hour ventilation of the living room by the heat exchange ventilation device 10 is started. At this time, the power supply of the local exhaust device 20 is in the off state, and the bathroom local ventilation by the local exhaust device 20 is in the stopped state. That is, in the heat exchange ventilation device 10, the heat exchange ventilation of the living room is performed by the heat exchange ventilation device 10 by supplying the outside air to the living room and exhausting the indoor air of the living room, and the ventilation is performed. Therefore, the exhaust performed in the heat exchange ventilation of the heat exchange ventilation device 10 is only the exhaust of the indoor air in the living room, and the exhaust of the bathroom air is not performed in the heat exchange ventilation of the heat exchange ventilation device 10.

Further, when the power of the heat exchange ventilation device 10 is turned on, the temperature / humidity sensor 30 starts detecting the temperature and humidity of the exhaust flow on the upstream side of the heat exchanger 13 in the exhaust air passage 107. That is, the temperature / humidity sensor 30 starts detecting the temperature and humidity of the exhausted indoor air before the heat is exchanged by the heat exchanger 13. The temperature / humidity sensor 30 transmits the detection result to the control unit 14 of the heat exchange ventilation device 10.

Further, when the power of the heat exchange ventilation device 10 is turned on, the outside air temperature sensor 40 starts detecting the temperature of the supplied outside air and transmits the detection result to the control unit 14 of the heat exchange ventilation device 10. .. The control unit 14 receives the detection results transmitted from the temperature / humidity sensor 30 and the outside air temperature sensor 40.

Next, in step S20, the control unit 14 determines whether or not the power of the local exhaust device 20 has been turned on. When the power of the local exhaust device 20 is turned on by the remote controller 50, the local exhaust device 20 does not start the operation just by turning on the power, but goes into the standby state of the operation. When the power of the local exhaust device 20 is turned on, the control unit 22 of the local exhaust device 20 sends an on signal indicating that the power of the local exhaust device 20 is turned on via the home communication line 62 to the heat exchange ventilation device 10. Is transmitted to the control unit 14.

Then, when the control unit 14 receives the ON signal, it determines that the power of the local exhaust device 20 has been turned on. Further, the control unit 14 determines that the power supply of the local exhaust device 20 is not turned on when the ON signal is not received. If it is determined that the power of the local exhaust device 20 is not turned on, the result is No in step S20, and the process returns to step S20. If it is determined that the power of the local exhaust device 20 is turned on, the result is Yes in step S20, and the process proceeds to step S30.

In step S30, the control unit 14 determines whether the humidity H _RA of the intake air of the heat exchange ventilation, that is, the humidity H _{RA of the} indoor air detected by the temperature / humidity sensor 30 is a predetermined first humidity H ₁ or more. Judge whether or not. The first humidity H ₁ is a humidity threshold value for determining whether or not the control unit 14 performs bathroom ventilation by the heat exchange ventilation device 10. When the humidity H _{RA of the} indoor air is 1st humidity H ₁ or more, the result is Yes in step S30, and the process proceeds to step S40. On the other hand, if the humidity H _{RA of the} indoor air is less than the first humidity H ₁ , the result becomes No in step S30, and the process proceeds to step S50.

In step S40, the control unit 14 controls to continue the ventilation operation of the heat exchange ventilation device 10 as it is. That is, in the heat exchange ventilation system 100, the heat exchange ventilation of the living room is performed by the heat exchange ventilation device 10 by supplying the outside air to the living room and exhausting the indoor air of the living room.

Further, the control unit 14 sends a switching signal to switch the air passage switching damper 60 to a position where the air passage of the bathroom air taken in from the exhaust intake port 72 is switched to the local ventilation air passage to be introduced into the local exhaust duct 115. Send. Further, the control unit 14 transmits an operation signal indicating the start of operation of the local exhaust device 20 to the control unit 22 of the local exhaust device 20 to control the start of operation of the local exhaust device 20 in the bathroom.

The air passage switching damper 60 is displaced to a position where the air passage of the bathroom air taken in from the exhaust intake port 72 is switched to the bathroom local ventilation air passage introduced into the local exhaust duct 115 according to the switching signal. Upon receiving the operation signal, the control unit 22 of the local exhaust device 20 starts ventilation of the bathroom according to the operation signal. That is, the local exhaust device 20 starts local ventilation. Therefore, the exhaust performed in the heat exchange ventilation of the heat exchange ventilation device 10 is only the exhaust of the indoor air in the living room, and the exhaust of the air in the bathroom is not performed. After that, the control unit 14 returns to step S30 after the elapse of the predetermined determination time interval t.

In step S50, the control unit 14 has a humidity H _RA of the intake air for heat exchange ventilation, that is, a humidity H _{RA of the} indoor air detected by the temperature / humidity sensor 30 is a predetermined second humidity H ₂ or more. Judge whether or not. The second humidity H ₂ is a humidity threshold value for determining whether or not the control unit 14 performs bathroom ventilation by the heat exchange ventilation device 10, and is a threshold value smaller than the first humidity H ₁ . If the humidity H _{RA of the} indoor air is the second humidity H ₂ or higher, the result is Yes in step S50, and the process proceeds to step S60. In the case of Yes in step S50, the humidity H _{RA of the} indoor air is the second humidity H ₂ or more and the first humidity H _{1 or} less (H ₂ ≤ H _RA <H ₁ ). On the other hand, if the humidity H _{RA of the} indoor air is less than the second humidity H ₂ , the result becomes No in step S50, and the process proceeds to step S70.

In step S60, the control unit 14 controls the ventilation of the bathroom by starting the exhaust of the bathroom in addition to the exhaust of the living room as the exhaust performed in the heat exchange ventilation of the heat exchange ventilation device 10 only in winter. .. Current is whether winter determination is performed using, for example, the outside air temperature T _OA detected by the outside air temperature sensor 40.

Control unit 14, for example, currently if the detected outside air temperature T _OA is first temperature T ₁ of less than or equal to a predetermined is determined to be winter by the outside air temperature sensor 40, outside air temperature T _OA first temperature If it is larger than T _1, it is judged that the present season is other than winter. The first temperature T ₁ is a temperature threshold value for the control unit 14 to determine whether or not the present season is winter.

That is, in step S60, the control unit 14, the outside air temperature _{T OA} is equal to or first temperature _{T 1} of less. If the outside air temperature T _OA is equal to or lower than the first temperature T ₁ , the result is Yes in step S60, and the process proceeds to step S70. On the other hand, when the outside air temperature _{T OA} is greater than the first temperature _{T 1,} the process proceeds No and in step S60, to step S40.

In step S70, the control unit 14 introduces the bathroom air taken in from the exhaust intake port 72 into the heat exchange ventilation device 10 via the indoor side exhaust duct 113 and the indoor side suction port 103 into the bathroom heat exchange ventilation air passage. A switching signal indicating that the air passage switching damper 60 is switched is transmitted to the switching position. As a result, in the heat exchange ventilation device 10, heat exchange ventilation is performed in which the exhaust is the exhaust of the indoor air in the living room and the exhaust of the bathroom air in the bathroom. That is, in the heat exchanger 13, in order to exchange heat between the bathroom air of the hot and humid air and the outside air, the exhaust heat of the bathroom air is recovered and the outside air in a state where the temperature and humidity are further increased is supplied to the room. Can be done.

Further, the control unit 14 does not transmit an operation signal indicating the start of operation of the local exhaust device 20, and controls the local exhaust device 20 to remain stopped. Therefore, at this time, the operation of the local exhaust device 20 in the bathroom remains stopped.

After that, the control unit 14 returns to step S30 after the elapse of the predetermined determination time interval t.

Next, numerical examples of the above-mentioned constants will be described. First humidity H ₁ : Absolute humidity 8.7 g / kg (Dry Air: DA), Second humidity H ₂ : Absolute humidity 5.8 g / kg (DA), first temperature T1: 15 ° C, determination time interval t : 10 minutes and so on. The first humidity H ₁ should set the upper limit humidity at which the heat exchanger 13 of the heat exchange ventilator 10 does not condense, and the second humidity H ₂ should set the lower limit of the comfortable humidity range in the room. Further, in order to control the above, it is necessary to set H ₁ > H ₂ . The first temperature T ₁ is set to a temperature at which it feels chilly or wants to be heated. The determination time interval t needs to be determined every few minutes so as not to cause a dew condensation problem in the heat exchange ventilation device 10 due to the high humidity exhaust being taken into the heat exchange ventilation device 10 for a long time.

It should be noted that each of the above-mentioned numerical values is an example and is not limited to the above-mentioned numerical values.

As described above, in the heat exchange ventilation system 100 according to the first embodiment, when the bathroom is ventilated, the hot and humid air generated in the bathroom is taken into the heat exchange ventilation device 10 to exchange heat. , The recovery effect of temperature and humidity can be enhanced. That is, by using the exhaust flow of indoor air and the exhaust flow of hot and humid air generated in the bathroom as the exhaust flow used for heat exchange in the heat exchange ventilation device 10, the temperature of the air supply air supplied to the room and the temperature of the air supply air are supplied. Humidity can be higher. Since the outside air can be supplied indoors, it is possible to suppress overdrying of the living room while introducing clean outdoor air, and an increase in carbon dioxide concentration in the indoor air and a muffled odor occur. There is no. Further, when performing bathroom heat exchange ventilation, it is not necessary to change the ventilation volume of the heat exchange ventilation device 10, and the ventilation can be performed with the existing ventilation air volume of 24-hour ventilation, and the ventilation volume can be maintained.

Further, in the heat exchange ventilation system 100 according to the first embodiment, it is possible to suppress the direct intrusion of outside air generated by the third type local ventilation of the bathroom.

Therefore, in the heat exchange ventilation system 100, the total heat exchange efficiency of the house as a whole can be improved, and it is possible to prevent the room from becoming overdried. The heat exchange ventilation using the hot and humid air generated in the bathroom as the heat exchange exhaust flow in the heat exchange ventilation device 10 is particularly effective in the winter when the room is dry.

Further, by using the temperature / humidity threshold value, it is possible to avoid the dew condensation failure of the heat exchanger 13 and the adverse effect due to the heat exchange of the hot and humid air in the summer even when the bathroom air is heat exchange-ventilated.

Further, in the heat exchange ventilation system 100, the above functions can be realized only by providing the exhaust intake port 72, the indoor exhaust duct 113 connected to the exhaust intake port 72, and the air passage switching damper 60, and a plurality of blowers. It is necessary to install parts such as duct piping and multiple grills. Therefore, the above functions can be realized at low cost. In addition, since the configuration is not complicated, the space behind the ceiling is not compressed and the interior quality is not deteriorated.

Further, in the above, when it is desired to exhaust the bathroom air to the outside without exchanging heat with the outside air, the exhaust is performed by the separately installed local exhaust device 20. As a configuration for exhausting the air in the bathroom to the outside without exchanging heat with the outside air, the air in the bathroom is diverted without passing through the heat exchanger 13 without installing the local exhaust device 20, and the heat exchange ventilator 10 is used outdoors. The heat exchange ventilator 10 may be provided with a bypass air passage that blows toward.

FIG. 6 is a schematic view showing the configuration of another heat exchange ventilation device 210 applicable to the heat exchange ventilation system 100 according to the first embodiment of the present invention. The other heat exchange ventilator 210 differs from the heat exchange ventilator 10 described above in that it has a bathroom side suction port 121 as a suction port for taking in bathroom air and that the bathroom air taken in from the bathroom side suction port 121 is taken in. The bathroom heat exchange air passage 123 that blows out from the outdoor air outlet 104 through the heat exchanger 13 and the bathroom air taken in from the bathroom side suction port 121 are diverted without passing through the heat exchanger 13 to the room. It is a point that the housing 105 has a bypass air passage 124 for discharging air from the outer air outlet 104 toward the outside. Further, the bathroom exhaust air passage for connecting the exhaust intake port 72 and the bathroom side suction port 121 to the bathroom side suction port 121 and taking the bathroom air into another heat exchange ventilation device 210 as an air suction port. The bathroom exhaust duct 122 constituting the above is connected.

Then, in the area adjacent to the bathroom side suction port 121 inside the housing 105, the air passage switching damper 61 which is the second air passage switching portion for switching the air passage of the bathroom air taken in from the bathroom side suction port 121 To be equipped with. The air passage switching damper 61 can switch the air passage of the bathroom air taken in from the suction port 121 on the bathroom side into three patterns of a bathroom heat exchange air passage 123, a bypass air passage 124, and an air passage closure. Is. That is, the air passage switching damper 61 stops the ventilation of the bathroom, passes the air of the bathroom through the heat exchanger 13, and blows out the air from the outdoor outlet 104 toward the outside, and the air of the bathroom. Can be switched to three patterns: bypass ventilation in the bathroom, in which the air is bypassed without passing through the heat exchanger 13 and discharged from the outdoor air outlet 104 toward the outside.

The air passage switching damper 61 is controlled by the control unit 14 at a position where the air passage of the bathroom air taken in from the bathroom side suction port 121 is switched to the bathroom heat exchange air passage 123 and is taken in from the bathroom side suction port 121. It is displaced to either a position where the air passage of the bathroom air is switched to the bypass air passage 124 or a position where the air passage of the bathroom air taken in from the suction port 121 on the bathroom side is closed.

Next, the ventilation operation using another heat exchange ventilation device 210 will be described. FIG. 7 is a flowchart showing an example of a procedure for operating the heat exchange ventilation system 100 using the other heat exchange ventilation device 210 according to the first embodiment of the present invention.

First, in step S110, the power of the other heat exchange ventilation device 210 is turned on, and the 24-hour ventilation of the living room by the other heat exchange ventilation device 210 is started. That is, in the other heat exchange ventilation device 210, the heat exchange ventilation of the living room is performed by the other heat exchange ventilation device 210 by supplying the outside air to the living room and exhausting the indoor air of the living room. Therefore, the exhaust performed in the heat exchange ventilation of the other heat exchange ventilation device 210 is only the exhaust of the indoor air in the living room, and the exhaust air of the bathroom is not performed in the heat exchange ventilation of the heat exchange ventilation device 10. At this point, the air passage switching damper 61 is arranged at a position where ventilation of the bathroom is stopped, that is, a position where the air passage of the air in the bathroom taken in from the suction port 121 on the bathroom side is closed.

Further, when the power of the other heat exchange ventilation device 210 is turned on, the temperature / humidity sensor 30 starts detecting the temperature and humidity of the exhaust flow on the upstream side of the heat exchanger 13 in the exhaust air passage 107. That is, the temperature / humidity sensor 30 starts detecting the temperature and humidity of the exhausted indoor air before the heat is exchanged by the heat exchanger 13. The temperature / humidity sensor 30 transmits the detection result to the control unit 14 of another heat exchange ventilation device 210.

Further, when the power of the other heat exchange ventilation device 210 is turned on, the outside air temperature sensor 40 starts detecting the temperature of the supplied outside air, and the detection result is the control unit of the other heat exchange ventilation device 210. Send to 14. The control unit 14 receives the detection results transmitted from the temperature / humidity sensor 30 and the outside air temperature sensor 40.

Next, in step S120, the control unit 14 determines whether or not a bathroom ventilation signal indicating the start of bathroom ventilation has been received. The remote controller 50 receives a bathroom ventilation instruction input from the user to instruct the start of bathroom ventilation. Upon receiving the bathroom ventilation instruction, the remote controller 50 transmits a bathroom ventilation signal indicating the start of bathroom ventilation to the control unit 14 of another heat exchange ventilation device 210 via the home communication line 62.

Then, the control unit 14 determines whether or not the bathroom ventilation signal is received. If it is determined that the bathroom ventilation signal has not been received, the result is No in step S120, and the process returns to step S120. If it is determined that the bathroom ventilation signal has been received, the result is Yes in step S120, and the process proceeds to step S130.

In step S130, the control unit 14 has a humidity H _RA of the intake air for heat exchange ventilation, that is, a humidity H _{RA of the} indoor air detected by the temperature / humidity sensor 30 is a predetermined first humidity H ₁ or more. Judge whether or not. When the humidity H _{RA of the} indoor air is 1st humidity H ₁ or more, the result is Yes in step S130, and the process proceeds to step S140. On the other hand, if the humidity H _{RA of the} indoor air is less than the first humidity H ₁ , the result becomes No in step S130, and the process proceeds to step S150.

In step S140, the control unit 14 controls the bathroom bypass ventilation in which the bathroom air taken in from the bathroom side suction port 121 is passed through the bypass air passage 124 and bypass-exhausted. That is, the control unit 14 controls to arrange the air passage switching damper 61 at a position where the air passage of the air in the bathroom taken in from the suction port 121 on the bathroom side is switched to the bypass air passage 124. In step S140, 24-hour ventilation of the living room by another heat exchange ventilation device 210 is also performed in parallel. Therefore, the exhaust performed in the other heat exchange ventilation device 210 is the exhaust of the indoor air in the living room and the bypass exhaust of the bathroom air passed through the bypass air passage 124. After that, the control unit 14 returns to step S130 after the elapse of the predetermined determination time interval t.

In step S150, the control unit 14 has a humidity H _RA of the intake air for heat exchange ventilation, that is, a humidity H _{RA of the} indoor air detected by the temperature / humidity sensor 30 is a predetermined second humidity H ₂ or more. Judge whether or not. When the humidity H _{RA of the} indoor air is the second humidity H ₂ or more, the result is Yes in step S150, and the process proceeds to step S160. In the case of Yes in step S150, the humidity H _{RA of the} indoor air is the second humidity H ₂ or more and the first humidity H _{1 or} less (H ₂ ≤ H _RA <H ₁ ). On the other hand, when the humidity H _{RA of the} indoor air is less than the second humidity H ₂ , the result becomes No in step S150, and the process proceeds to step S170.

In step S160, the control unit 14 controls to ventilate the bathroom by starting the exhaust of the bathroom in addition to the exhaust of the living room as the exhaust performed in the heat exchange ventilation of the other heat exchange ventilation device 210 only in winter. carry out. That is, the control unit 14 controls the bathroom heat exchange ventilation by passing the bathroom air through the heat exchanger 13 and blowing it out from the outdoor outlet 104 toward the outside only in winter.

That is, at step S160, the control unit 14, the outside air temperature _{T OA} is equal to or first temperature _{T 1} of less. If the outside air temperature T _OA is equal to or lower than the first temperature T ₁ , the result is Yes in step S160, and the process proceeds to step S170. On the other hand, the outside air temperature _{T OA} cases is greater than the first temperature _{T 1} of the No and the process progresses to step S140 in step S160.

In step S170, the control unit 14 controls the bathroom heat exchange ventilation for exhausting the bathroom air taken in from the bathroom side suction port 121 through the heat exchanger 13. That is, the control unit 14 controls to arrange the air passage switching damper 61 at a position where the air passage of the bathroom air taken in from the bathroom side suction port 121 is switched to the bathroom heat exchange air passage 123. As a result, in the other heat exchange ventilation device 210, heat exchange ventilation is performed in which the exhaust is the exhaust of the indoor air in the living room and the exhaust of the bathroom air in the bathroom. That is, in step S170, 24-hour ventilation of the living room by another heat exchange ventilation device 210 is also performed in parallel. Therefore, the exhaust performed in the other heat exchange ventilation device 210 is the exhaust of the indoor air in the living room and the exhaust of the bathroom air passed through the heat exchanger 13. As a result, in the heat exchanger 13, in order to exchange heat between the bathroom air of the hot and humid air and the outside air, the exhaust heat of the bathroom air is recovered and the outside air in a state where the temperature and humidity are further increased is supplied to the room. be able to.

After that, the control unit 14 returns to step S130 after the elapse of the predetermined determination time interval t.

As described above, when the other heat exchange ventilation device 210 is applied to the heat exchange ventilation system 100, the same effect as that of the heat exchange ventilation system 100 provided with the heat exchange ventilation device 10 described above can be obtained.

As described above, according to the heat exchange ventilation system 100 according to the first embodiment, the hot and humid air generated in the bathroom is exchanged with the outside air while avoiding the risk of dew condensation on the heat exchanger 13 in the hot and humid state. It is possible to supply air to the room and suppress overdrying of the living room while introducing clean outdoor air.

The configuration shown in the above-described embodiment shows an example of the contents of the present invention, and the technologies of the embodiments can be combined with each other, or can be combined with another known technology. However, it is also possible to omit or change a part of the configuration without departing from the gist of the present invention.

10 Heat Exchange Ventilator, 11 Air Supply Blower, 12 Exhaust Blower, 13 Heat Exchanger, 14 Control Unit, 20 Local Exhaust Device, 21 Exhaust Blower, 22 Control Unit, 30 Temperature / Humidity Sensor, 40 Outside Air Temperature Sensor, 50 remote controller, 60, 61 air passage switching damper, 62 home communication line, 71, 72 exhaust intake, 73 air supply outlet, 100 heat exchange ventilation system, 101 outdoor suction port, 102 indoor side outlet, 103 Indoor suction port, 104 outdoor air outlet, 105 housing, 106 air supply air passage, 107 exhaust air passage, 111 outdoor air supply duct, 112 indoor air supply duct, 113 indoor exhaust duct, 114 outdoor exhaust duct , 115 Local exhaust ducts, 121 Bathroom side inlets, 122 Bathroom exhaust ducts, 123 Bathroom heat exchange air passages, 124 Bypass air passages, 201 processors, 202 memories, 210 Other heat exchange ventilators.

Claims (8)

An air supply air passage for supplying outside air to a living room of a building, an exhaust air passage for exhausting the air in the living room to the outside, an exhaust flow flowing through the exhaust air passage, and an air supply air flowing through the air supply air passage. A heat exchanger that exchanges heat between the two, and a heat exchange ventilation device that ventilates while performing the heat exchange.
A humidity sensor that detects the humidity of the air in the living room when performing heat exchange ventilation in the living room, and
A control unit that controls the operation of the heat exchange ventilation device,
With
The control unit
When the humidity of the air in the living room detected by the humidity sensor is less than a predetermined first humidity threshold, the air in the bathroom is taken into the heat exchange ventilation device as an exhaust stream, and the outside air and the bathroom Controlling heat exchange ventilation of the living room using air as an exhaust flow,
A heat exchange ventilation system featuring. When the humidity of the air in the living room is less than the second humidity threshold value smaller than the first humidity threshold value, the control unit causes the living room to perform heat exchange ventilation using the outside air and the bathroom air as exhaust streams. To control,
The heat exchange ventilation system according to claim 1. The outside air temperature sensor for detecting the temperature of the outside air when performing heat exchange ventilation of the living room is provided.
The control unit determines the current season based on the temperature of the outside air detected by the outside air temperature sensor and a predetermined temperature threshold, and the humidity of the air in the living room is equal to or higher than the second humidity threshold. Yes, when it is determined that the current season is winter, the outside air and the air in the bathroom are used as exhaust streams to control the heat exchange ventilation of the living room.
The heat exchange ventilation system according to claim 2. It is equipped with a local exhaust system that ventilates the bathroom.
The control unit determines the current season based on the temperature of the outside air detected by the outside air temperature sensor and a predetermined temperature threshold, and the humidity of the air in the living room is equal to or higher than the second humidity threshold. Yes, when it is determined that the current season is a season other than winter, the outside air is used as an exhaust flow to perform heat exchange ventilation of the living room, and the local exhaust device controls the ventilation of the bathroom. To do,
The heat exchange ventilation system according to claim 3. It is equipped with a local exhaust system that ventilates the bathroom.
When the humidity of the air in the living room detected by the humidity sensor is equal to or higher than a predetermined first humidity threshold value, the control unit uses the outside air as an exhaust flow to perform heat exchange ventilation of the living room. Controlling the ventilation of the bathroom by the local exhaust device,
The heat exchange ventilation system according to any one of claims 1 to 4. An air passage for taking the air in the bathroom into the heat exchange ventilation device as an exhaust flow, and
An air passage switching unit that opens and closes the air passage under the control of the control unit,
To prepare
The heat exchange ventilation system according to any one of claims 1 to 4. The control unit determines the current season based on the temperature of the outside air detected by the outside air temperature sensor and a predetermined temperature threshold, and when the humidity of the air in the living room is equal to or higher than the second humidity threshold. Yes, when it is determined that the current season is a season other than winter, the outside air is used as an exhaust flow to perform heat exchange ventilation of the living room, and the air in the bathroom is not passed through the heat exchanger. Controlling the ventilation of the bathroom by discharging it from the heat exchange ventilation device,
The heat exchange ventilation system according to claim 3. A bathroom exhaust air passage for taking in the bathroom air into the heat exchange ventilation device, and
A position for switching to a bathroom heat exchange air passage through which the air in the bathroom taken into the heat exchange ventilator is passed through the heat exchanger and discharged from the heat exchange ventilator under the control of the control unit, and the heat exchange ventilation. A position for switching to a bypass air passage in which the air in the bathroom taken into the device is discharged from the heat exchange ventilator without passing through the heat exchanger, and an air passage for the air in the bathroom taken in the heat exchange ventilator. The position to close, the second air passage switching part that is displaced to, and
To prepare
7. The heat exchange ventilation system according to claim 7.

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