JPH04283334A - Heat exchanging ventilating device - Google Patents

Abstract

PURPOSE:To realize comfortable air conditioning by reducing cooling load by preventing high temperature high humidity fresh air from being forcedly supplied to a living room by interrupting forced fresh air supply upon the use of a bath room in summer. CONSTITUTION:A changeover switch 25 changes over whether heat exchange is to be performed between fresh air forcedly supplied to a living room by an air supply fan and indoor air forcedly exhausted from a bath room by an exhaust fan or the heat exchange is not to be performed. A relay 23 is interposed between a fan motor FM1 for driving an air supply fan and a commercial AC power supply 20. Once a bath room/living room selection switch 26 is connected to a terminal TB on the side of a bath room with the state where the changeover switch 25 is connected with a terminal T2 on the side of ordinary ventilation, the relay 23 is interrupted. Hereby, power supply to the fan motor FM1 is interrupted and forced fresh air supply is interrupted.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation system having a heat exchange function.

0002

[Prior Art] Conventionally, in order to reduce the energy required for air conditioning and achieve comfortable air conditioning, there has been a gap between the outside air that is supplied from the outdoors into the room and the air that is exhausted from the room to the outdoors. A heat exchange ventilation system is used that exchanges heat at Recently, attention has been paid to the fact that more comfortable air conditioning can be achieved by directly supplying outside air into the room without heat exchange during the intermediate period between summer and winter when heating and cooling is not required. BACKGROUND ART A system has been put into practical use that allows switching between heat exchange ventilation, which involves heat exchange between outside air and indoor air, and normal ventilation, which does not involve heat exchange, depending on the season.

A typical configuration of such a heat exchange ventilation device is shown in FIG. 4, where FIG. 4(a) is a simplified plan view showing the internal configuration, and FIG. 4(b) is a (a)
FIG. 2 is a simplified cross-sectional view taken along section line IV-IV of FIG. This heat exchange ventilation system includes an air supply passage 81 for guiding outdoor air K supplied from the outdoors into the room, and an indoor air H exhausted from the room to the outdoors in a casing 80 arranged in the ceiling or the like. An exhaust passage 82 is formed to guide the air, and a heat exchanger 83 exchanges heat between the outside air K passing through the passages 81 and 82 and the indoor air H. An air supply fan 84 is arranged in the air supply passage 81, and an exhaust fan 85 is arranged in the exhaust passage 82. 86-89 is outside air K
Alternatively, it is a duct for guiding indoor air H.

A bypass passage 90 is formed within the casing 80 to exhaust indoor air H to the outdoors without passing through the heat exchanger 83. This bypass passage 90
A damper 91 is provided at the inlet 90a. The damper 91 can be switched between a closed state and an open state of the inlet 90a. This damper 91 is energized by a damper motor 92 and rotates in both directions indicated by an arrow 93, so that indoor air H led from the room via an exhaust duct 86 passes through the heat exchanger 83 from the exhaust passage 82. and a state in which the air is exhausted through the bypass passage 90 without heat exchange. In this way, a heat exchange ventilation state in which heat is exchanged between the outside air K and the indoor air H,
It is possible to switch between the normal ventilation state in which no heat exchange is performed.

[0005] The heat exchange ventilation device as described above is used, for example, in hotels and condominiums, to exhaust the air in the bathroom.
It is sometimes used to supply outside air into a living room. Figure 5 shows the arrangement of the heat exchange ventilation system in such a case.
Shown below. An exhaust duct 86 for guiding indoor air H to be exhausted to the heat exchange ventilation device 60 is connected to an inlet 62 provided on the ceiling of the bathroom 61, and outside air K passing through the heat exchange ventilation device 60 is passed through a supply air duct 89. The air is guided into the living room 63 through an air outlet 64 provided on the ceiling of the living room 63. An indoor unit 65 of an air conditioner is installed in the living room 63.
The conditioned air in the bathroom 61 is guided into the bathroom 61 through a gallery 66 provided at the bottom of the door of the bathroom 61. Air in the bathroom 61 is led to the heat exchange ventilation device 60 through the suction port 62.

With this configuration, when heat exchange ventilation is performed, the air supply fan 84 and the exhaust fan 85
(see FIG. 4) are driven, and outside air K from the outdoors 70 is guided from the air supply duct 88 to the air supply duct 89 after heat exchange in the heat exchanger 83, and from the bathroom 61 to the room to be exhausted. The air H is exhausted from the exhaust duct 86 to the outdoors 70 via the exhaust duct 87 after heat exchange in the heat exchanger 83 . In addition, even when normal ventilation is performed, the air supply fan 84
and the exhaust fan 85 are both driven, while exhausting and supplying air are performed without the above-mentioned heat exchange, thereby achieving ventilation of the living room 63 and the bathroom 61.

[0007]

[Problems to be Solved by the Invention] In the above configuration, when the bathroom 61 is not in use, heat exchange ventilation is performed so that the outside air K, which has a reduced temperature difference with the indoor air, is brought into the living room 63 from the air outlet 64. Because it is guided by the air, it is possible to reduce the energy used for air conditioning and achieve comfortable ventilation. On the other hand, when bathroom 61 is used, normal ventilation may be preferable. That is, in summer, when heat exchange ventilation is performed when the bathroom is used, the hot and humid outside air K is heated to an even higher temperature by heat exchange with the high temperature air from inside the bathroom 61 in the heat exchanger 83. Room 63
You will be guided by In this case, the energy required for air conditioning increases, and the supply of hot and humid outside air K causes discomfort. Therefore, when using a bathroom in the summer, heat exchange ventilation is not preferable, and the user must switch to normal ventilation using, for example, a switch on a remote control device (not shown).

However, when normal ventilation is performed in the summer, the hot and humid outside air K is forcibly supplied to the living room 63 by the air supply fan 84, which increases the load on air conditioning. Furthermore, there is a possibility that the people in the living room 63 may feel uncomfortable. In addition, in winter, by performing heat exchange ventilation regardless of whether or not the bathroom 61 is used, heated outside air K can be supplied into the living room 63, reducing the load on air conditioning. This also allows for comfortable air conditioning. However, when normal ventilation is selected due to an incorrect operation of the remote control device, the low temperature and low humidity outside air K is forcibly supplied into the living room 63 as it is, which increases the load on air conditioning and reduces energy savings. In addition to being contrary to the above, it becomes impossible to achieve comfortable air conditioning.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned technical problems and to achieve comfortable air conditioning by achieving appropriate ventilation conditions depending on the usage status of the bathroom and the outside temperature. An object of the present invention is to provide a heat exchange ventilation device with a heat exchange function.

0010

[Means and operations for solving the problem] A heat exchange ventilation device according to claim 1 for achieving the above object is provided with an air supply fan that forcibly supplies air from the outdoors to a room to be ventilated. and an exhaust fan that forcibly exhausts air from a bathroom communicating with the room to the outdoors, and heat exchange is performed between the air supplied from the outdoors and the air exhausted from the bathroom. A heat exchange ventilation system capable of switching between a heat exchange ventilation state and a normal ventilation state in which ventilation is performed without performing heat exchange, which is equipped with a switching means for switching the air supply fan between an active state and a non-active state. It is.

[0011] According to such a configuration, the air supply fan can be put into a non-operating state by switching the switching means, so that there is a state in which outside air is forcibly supplied into the room from outside, and a state in which outside air is forced into the room. It is possible to switch between a state where forced air supply is not performed and a state where forced air supply is not performed. As a result, when the bathroom is used in the summer, for example, the air supply fan is disabled, thereby preventing hot and humid outside air from being actively supplied into the room. In other words, in the heat exchange ventilation state, outside air heated by high-temperature indoor air from the bathroom is prevented from being forcedly supplied, and in the normal ventilation state, hot and humid outside air is prevented from being supplied as is. It will be done.

The heat exchange ventilation system according to claim 2 supplies air from the outdoors to a room to be ventilated, exhausts air from a bathroom communicating with the room to the outdoors, and also supplies air from the outdoors to the room. In a heat exchange ventilation system that can switch between a heat exchange ventilation state in which heat is exchanged between the air exhausted from the bathroom and the air exhausted from the bathroom, and a normal ventilation state in which ventilation is performed without performing this heat exchange, a temperature detection means for detecting the temperature of the air from the bathroom; a dew condensation detection means for detecting the presence or absence of dew condensation from the air from the bathroom; and a temperature of the outdoor air detected by the temperature detection means is lower than a first predetermined value. and a control means for forcibly setting the heat exchange ventilation state when the dew condensation state is detected by the dew condensation detection means.

According to this configuration, when the temperature of the outdoor air is lower than the first predetermined value and dew condensation due to the air from the bathroom is detected by the control of the control means,
The device status is forced to heat exchange ventilation status. This ensures that heat exchange ventilation is performed when using the bathroom in winter. In this way, the heat of the indoor air, which has become hot due to use of the bathroom, can be effectively transferred to the outside air.

[0014] Furthermore, the heat exchange ventilation device according to claim 3 comprises:
The control means further comprises: an air supply fan for forcibly supplying air from the outdoors into the room; and an exhaust fan for forcibly exhausting air from the bathroom to the outdoors;
The temperature of the outdoor air detected by the temperature detection means is equal to or higher than a second predetermined value that is equal to or higher than the first predetermined value;
The air supply fan is also characterized in that the air supply fan is stopped when the dew condensation state is detected by the dew condensation detection means.

According to such a configuration, the temperature of the outdoor air is equal to or higher than the second predetermined value by the control of the control means;
Moreover, when condensation from the air from the bathroom is detected, the air supply fan is stopped. That is, when using the bathroom in the summer, the air supply fan is stopped to prevent forced supply of outside air. This prevents outside air heated by the high-temperature indoor air from the bathroom from being forcedly supplied during heat exchange ventilation, and prevents the hot and humid summer outside air from being supplied as is during normal ventilation. is prevented.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples will be explained in detail below with reference to the accompanying drawings showing examples. FIG. 2 is a diagram showing the basic configuration of a heat exchange ventilation system according to an embodiment of the present invention. Figure 2(a) is a simplified plan view showing the internal configuration, and Figure 2(b) is a simplified plan view showing the internal configuration.
) is a simplified cross-sectional view taken along the section line II-II. This heat exchange ventilation device, like the heat exchange ventilation device shown in FIG. 5 above, is installed in the ceiling etc.
It is used to exhaust air from the bathroom that communicates with the living room to the outdoors, and also to supply outside air from outside to the living room.

An air supply passage 2 is formed in the casing 1, through which air flows from an air supply duct D1 through which outside air K is introduced from the outdoors, and an air supply passage 2 is formed in which air flows from the bathroom through an exhaust duct D3. An exhaust passage 3 and a bypass passage 4 are formed through which air H selectively flows. A heat exchanger 5 is disposed in the middle of the air supply passage 2 and the exhaust passage 3 near the center of the casing 1, and heat exchange is performed between the outside air K and the indoor air H. Further, the bypass passage 4 is a passage for exhausting the indoor air H by bypassing the heat exchanger 5.

The outside air K after heat exchange in the heat exchanger 5 is transferred from an air supply fan 6 driven by a fan motor FM1 to an air supply duct D2 connected to an air outlet (not shown) provided in the ceiling of the living room. guided by. Further, the indoor air H after heat exchange or the indoor air H that has passed through the bypass passage 4 is given to an exhaust duct D4 connected to the outdoors from an exhaust fan 7 driven by a fan motor FM2.

A damper 10 is arranged at the entrance 4a of the bypass passage 4 to close or open the entrance 4a. This damper 10 is energized by a damper motor 11 and rotates in both directions shown by arrows 13 and 14 to close or open the inlet 4a. By closing or opening the inlet 4a of the bypass passage 4 by the damper 10, the indoor air H from the bathroom can be switched between the exhaust passage 3 and the bypass passage 4 to be circulated. Thereby, it is possible to switch between a heat exchange ventilation state in which heat exchange is performed between indoor air H and outside air K, and a normal ventilation state in which ventilation is achieved without this heat exchange.

FIG. 1 is an electrical circuit diagram showing the electrical configuration of the heat exchange ventilation system of this embodiment. Electric power from the commercial AC power supply 20 is supplied to the fan motor FM via the main power switch 21.
1, FM2 is supplied. A relay 23 including a relay coil 23R and a normally closed contact 23P is inserted into the power supply line 22 to the fan motor FM1 for the air supply fan 6. 24 is a terminal block.

On the other hand, the damper motor 11 for driving the damper 10 is powered by a changeover switch 25 for switching between heat exchange ventilation and normal ventilation via a microswitch S1 or S2. . The microswitch S1 is a normally closed switch that opens at the end of rotation when the damper motor 11 is energized and the damper 10 rotates in the direction of arrow 13 in FIG. Arrow 1 at 2
This is a normally closed switch that opens at the end of rotation when rotating in four directions. Therefore, for example, changeover switch 2
5 to the terminal T1 on the heat exchange ventilation side, the damper motor 11 is energized via the microswitch S1,
When the damper 10 closes the entrance 4a of the bypass passage 4,
Microswitch S1 is opened and power supply to damper motor 11 is stopped. A similar operation occurs when the changeover switch 25 is connected to the terminal T2 on the normal ventilation side, and the damper 10 rotates in the direction shown by the arrow 14 in FIG. 2, so that the damper 10 is in the position shown by the broken line in FIG. Sometimes switch S2
is opened and power supply to the damper motor 11 is stopped.

When the bathroom/room selection switch 26, which is a switching means, is connected to the contact TB on the bathroom side, the relay coil 23R of the relay 23 is excited by the electric power passed through the switch 26, and opens the normally closed contact 23P. As a result, the power supply to the fan motor FM1 for driving the air supply fan 6 is stopped, the forced supply of outside air K from the outdoors by the air supply fan 6 is stopped, and the heat exchange ventilation device concerned is stopped. will only function as an exhaust fan.

According to the configuration of this embodiment, when using the bathroom in the summer, the selector switch 25 is switched to the contact T2 on the normal ventilation side, and the bathroom/room selection switch 26 is switched to the contact TB on the bathroom side. Ventilation is achieved without heat exchange between the high-temperature indoor air H from the bathroom and the outdoor air K from the outdoors, and the forced supply of hot and humid outdoor air K from the outdoors is not performed. As a result, the hot and humid outdoor air K is not forcibly supplied into the living room, which reduces the load on air conditioning and improves air quality without causing discomfort to the people in the room. air conditioning can be achieved.

When the bathroom is not used in summer or in winter, the selector switch 25 is connected to the terminal T1 on the heat exchange side, and the bathroom/room selection switch 26 is connected to the terminal T1 on the side of the living room.
By connecting to L, both the air supply fan 6 and the exhaust fan 7 can be activated, allowing good ventilation accompanied by heat exchange. This makes it possible to achieve comfortable air conditioning with low energy consumption.

[0025]Furthermore, during the intermediate seasons such as spring and autumn when heating and cooling are not required, the selector switch 25 is connected to the terminal T2 on the normal ventilation side, and the bathroom/room selection switch 26 is connected to the terminal TL on the living room side. . As a result, the outside air without heat exchange is forcibly supplied into the living room, thereby achieving comfortable ventilation. In addition, during the heat exchange ventilation operation, the changeover switch 25 is connected to the terminal T1, so the bathroom/room selection switch 26 is connected to the terminal T on the bathroom side.
B, the relay coil 23R is not energized, so the normally closed contact 23P is kept closed, and the air supply fan 6
becomes active. In other words, during heat exchange ventilation operation,
In order to perform heat exchange efficiently, the operation of the air supply fan 6 is not stopped.

FIG. 3 is an electrical circuit diagram showing the electrical configuration of a heat exchange ventilation system according to another embodiment of the present invention. In the description of this embodiment, reference will be made again to FIG. 2 described above. In FIG. 3, parts corresponding to those shown in FIG. 1 described above are designated by the same reference numerals. In this embodiment, as shown in FIG. 2, in the casing 1 of the heat exchange ventilation system, there is a space near the outside air inlet 30 to which the air supply duct D1 that leads outside air K from outside is connected. A temperature sensor 31 is arranged to detect temperature. Also, an exhaust inlet 3 to which an exhaust duct D3 that guides indoor air H from the bathroom is connected.
A dew condensation sensor 3 is located near 2 to detect the presence or absence of dew condensation.
3 is placed.

The outputs of these sensors 31 and 33 are given to a control section 35 that includes a microcomputer and the like. This control unit 35 controls relay contacts R1 to R provided in each part of the circuit based on the outputs of the sensors 31 and 33.
4 is made conductive or cut off. A parallel circuit of relay contacts R1 and R2, both of which are normally closed contacts, is inserted into the power line 36 for supplying operating power to the fan motor FM1 for driving the air supply fan 6. That is, as long as either one of the relay contacts R1, R2 is closed, the air supply fan 6 is in the active state. When the outside air temperature detected by the temperature sensor 31 becomes equal to or higher than a predetermined value t1 (for example, 25° C.), which serves as both the first predetermined value and the second predetermined value, the control unit 35 activates the relay coil (not shown) corresponding to the relay contact R1. ) is energized to open this relay contact R1. Further, the relay contact R2 is opened under the control of the control section 35 when the dew condensation state is detected by the dew condensation sensor 33. Therefore, when the outside air temperature exceeds the predetermined value t1 and a dew condensation state is detected, the air supply fan 6 is stopped. This condition is a condition that is met when using the bathroom in the summer.

On the other hand, the relay contact R3 connected between the terminal T2 on the normal ventilation side of the changeover switch 25 and the microswitch S2 is a normally closed contact, and when the dew condensation state is detected by the dew condensation sensor 33, , is opened under the control of the control section 35. When this relay contact R3 is open, the damper motor 11 will not be energized even if the changeover switch 25 is connected to the terminal T2 on the normal ventilation side. Therefore, the damper 10 is kept in a state where the bypass passage 4 is closed from beginning to end (the position shown by the solid line in FIG. 2). In other words, heat exchange ventilation is always performed when using the bathroom.

Furthermore, the relay contact R4 is connected to the dew condensation sensor 33.
This is a normally open contact that is controlled by the control unit 35 to close when a dew condensation state is detected. This relay contact R4 closes when condensation is detected when the changeover switch 25 is connected to the terminal T2 on the normal ventilation side and the bathroom is started to be used. The damper motor 11 is energized. As a result, the damper 10 reaches a state in which the bypass passage 4 is closed. In this way, regardless of the setting of the changeover switch 25, the heat exchange ventilation state is forcibly set when the bathroom is used.

Next, the operation of the heat exchange ventilation system of this embodiment will be explained separately in summer and winter. First, the operation in summer will be explained. The above predetermined value t1 is set so that the outside temperature is equal to or higher than the predetermined value t1 in summer. Therefore, during the summer, relay contact R1 is open all the time. In this state, the operation is divided into the following four types depending on whether the ventilation is heat exchange ventilation or normal ventilation, and whether the bathroom is in use or not (that is, whether or not the condensation state is detected by the condensation sensor 33). It will be done.

[1] First operation (when using the bathroom in the heat exchange ventilation state) In the heat exchange ventilation state, the changeover switch 25 is connected to the terminal T1 on the heat exchange ventilation side. Also, when using the bathroom, the condensation sensor 33 detects the condensation state, so the relay contact R2,
R3 is opened and relay contact R4 is closed. As a result, the damper 10 closes the bypass passage 4 and the air supply fan 6
is not driven. Therefore, although heat exchange is performed in the heat exchanger 5, forced air supply is not performed, and only forced exhaust air is performed. Therefore, since the hot and humid outside air K after heat exchange is not actively supplied to the living room, the cooling load can be reduced and the people in the living room will not feel uncomfortable.

■Second operation (when the bathroom is not in use in a heat exchange ventilation state) When the bathroom is not in use, the condensation sensor 33 does not detect condensation, so relay contacts R2 and R3 are closed, and relay contact R4 is closed. It will be developed. Therefore, since the air supply fan 6 is driven, both air supply and exhaust are forcibly performed, and heat exchange ventilation is performed. In this case, the indoor air H cooled by the air conditioner reaches the bathroom from the living room, and is discharged outdoors from the bathroom after heat exchange in the heat exchanger 5 of the heat exchange ventilation device. Therefore, since the outside air K is cooled by the heat exchanger 5 and then supplied to the living room, the cooling load can be reduced and comfortable cooling can be achieved.

[0033] Third operation (when using the bathroom in normal ventilation state) When normal ventilation is performed, the changeover switch 25 is connected to the contact T2 on the normal ventilation side. As a result, damper 1
0 opens the bypass passage 4 and shuts off the microswitch S2. When using the bathroom, the condensation sensor 33
detects a condensation condition, so relay contacts R2 and R3 are opened and relay contact R4 is closed. In this state,
Since fan motor FM1 is not powered, air supply fan 6 is not driven. Therefore, only exhaust is forcibly performed, and air supply is not forcibly performed. In this way, hot and humid outside air K is prevented from being forced into the living room, reducing the cooling load and achieving comfortable air conditioning.

■Fourth operation (normal ventilation and when the bathroom is not in use) In this case, since the condensation sensor 33 does not detect the condensation state, relay contacts R2 and R3 are closed, and relay contact R
4 is opened. As a result, the fan motor FM1 is supplied with power from the commercial AC power supply 20, and the fan motor FM1 is supplied with power from the commercial AC power supply 20.
A forced supply of outside air K is performed. Although this kind of operation is undesirable from the perspective of reducing the energy required for air conditioning, normal ventilation is a ventilation state that is normally selected during intermediate seasons such as spring and autumn when heating and cooling are unnecessary. It's not a big problem.

Next, the operation in winter will be explained. In winter, since the outside temperature is low, the relay contact R1 remains closed throughout. Operations in winter are also classified into four types, similar to operations in summer. ■ The first operation (when using the bathroom in the heat exchange ventilation state) selector switch 25 is connected to the contact T1 on the heat exchange ventilation side,
As a result, the damper 10 closes the bypass passage 4 and shuts off the microswitch S1. When using the bathroom, the condensation sensor 33 detects condensation, so relay contacts R2 and R
3 is opened, and relay contact R4 is closed. Since relay contact R1 is closed, operating power is supplied to fan motor FM1, and therefore both air supply and exhaust are forced. On the other hand, by opening the relay contact R3, even if the operator accidentally switches the changeover switch 25 to the contact T2 on the normal ventilation side, power will not be applied to the damper motor 11, so that the changeover switch 25 will not be powered. The heat exchange ventilation state is maintained without any operation.

In this way, when using the bathroom, heat exchange ventilation is always carried out to ensure heat exchange between the indoor air H from the bathroom heated to a high temperature and the outside air K.
This reduces the heating load and provides comfortable air conditioning. ■ Second operation (when the bathroom is not in use in a heat exchange ventilation state) When the bathroom is not in use, the condensation sensor 33 does not detect condensation, so relay contacts R2 and R3 are closed, and relay contact R4 is opened. . Therefore, the changeover switch 25
It is also possible to switch to the normal ventilation state by switching the .

■Third operation (when using the bathroom in normal ventilation state) In the period before the condensation sensor 33 detects the condensation state,
When the changeover switch 25 is connected to the terminal T2 on the normal ventilation side, the damper 10 opens the bypass passage 4,
The microswitch S2 is in a cut-off state. From this state, when the dew condensation sensor 33 detects dew condensation due to use of the bathroom, relay contacts R2 and R3 are opened, and relay contact R4 is closed instead. As a result, the damper motor 11 is energized via the changeover switch 25, the relay contact R4, and the microswitch S1, and the damper 10 enters a state in which the bypass passage 4 is closed and the microswitch S1 is cut off.

[0038] In this way, even in the normal ventilation state, when the bathroom starts to be used, the state is forcibly shifted to the heat exchange ventilation state. As a result, when the bathroom is used, the heated outside air K can be supplied to the living room after ensuring heat exchange between the high-temperature indoor air H from the bathroom and the low-temperature outside air K. Thereby, the heating load can be reduced, and comfortable air conditioning can be achieved by supplying outside air K, which has a small temperature difference with the air inside the living room, to the living room.

■ Fourth operation (when the bathroom is not in use under normal ventilation conditions) When the bathroom is not in use, relay contacts R2 and R3 are closed;
Relay contact R4 is in an open state. By switching the changeover switch 25, it is possible to arbitrarily shift to the heat exchange ventilation state. Such normal ventilation in winter is undesirable from the viewpoint of reducing heating load and achieving comfortable air conditioning, but since normal ventilation is generally selected only during the intermediate season, it is not a major problem. Does not occur.

As described above, according to the heat exchange ventilation system of this embodiment, when using the bathroom in summer, outside air K is not forcibly supplied in either the heat exchange ventilation state or the normal ventilation state. It is said that As a result, the outside air K heated by the hot and humid indoor air H from the bathroom,
This prevents the hot and humid outside air K from being actively introduced into the living room, reducing the cooling load and achieving comfortable air conditioning.

[0041] In addition, in winter, by forcing the bathroom into a heat exchange ventilation state when using the bathroom, the high temperature indoor air H from the bathroom is used to efficiently heat the outside air K before supplying it to the living room. ing. As a result, the heating load is reduced, and comfortable air conditioning is realized by supplying outside air K, which has a small temperature difference with the air inside the living room, into the living room.

Note that this embodiment is not limited to the above embodiment. For example, in the above embodiment, the first predetermined value is used to detect winter and the second predetermined value is used to detect summer.
Although the predetermined value t (° C.) common to the predetermined value of is used, the first and second predetermined values may be different values. In addition, various design changes can be made without changing the gist of the present invention.

[0043]

According to the heat exchange ventilation system according to claim 1, when using a bathroom in summer, for example,
By disabling the air supply fan, hot and humid outside air is prevented from being actively supplied into the room. This prevents forced supply of outside air with a large temperature difference with the indoor air, reduces the load on air conditioning, and makes it possible to achieve comfortable air conditioning.

Furthermore, according to the heat exchange ventilation system of the second aspect, heat exchange ventilation can be reliably carried out when the bathroom is used in winter. In this way, the heat of the indoor air, which has become hot due to use of the bathroom, can be effectively transferred to the supplied outside air. As a result, the load on air conditioning can be reduced, and comfortable air conditioning can be achieved by supplying outside air, which has a small temperature difference with the room, into the room.

Furthermore, according to the heat exchange ventilation system according to the third aspect, when the bathroom is used in summer, the air supply fan is stopped, thereby preventing forced supply of outside air. As a result, it is possible to suppress the supply of hot and humid outside air into the room, reduce the load on air conditioning, and realize comfortable air conditioning.

[Brief explanation of the drawing]

FIG. 1 is an electrical circuit diagram showing the electrical configuration of a heat exchange ventilation system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a simplified configuration of the heat exchange ventilation device.

FIG. 3 is an electrical circuit diagram showing the electrical configuration of a heat exchange ventilation device according to another embodiment of the present invention.

FIG. 4 is a diagram showing a simplified configuration of a conventional heat exchange ventilation device.

FIG. 5 is a simplified sectional view showing an installation mode of the heat exchange ventilation device.

[Explanation of symbols]

5 Heat exchanger 6 Air supply fan 7 Exhaust fan 10 Damper 11 Damper motor 25 Changeover switch 26 Bathroom/room selection switch (switching means) 31
Temperature sensor 33 Condensation sensor 35 Control unit FM1 Fan motor FM2 Fan motor

Claims (3)

[Claims] Claim 1: An air supply fan (6) that forcibly supplies air from the outdoors to a room to be ventilated, and an exhaust fan (6) that forcibly exhausts air from a bathroom communicating with the room to the outdoors.
7) A heat exchange ventilation state in which heat exchange is performed between the air supplied from outside and the air exhausted from the bathroom, and a normal ventilation state in which ventilation is performed without performing this heat exchange. 1. A heat exchange ventilation system capable of switching between the air supply fan (6) and the air supply fan (6). Claim 2: Air from the outdoors is supplied to the room to be ventilated, air from a bathroom communicating with the room is exhausted outdoors, and the air supplied from the outdoors and the bathroom are exhausted from the bathroom. Temperature detection that detects the temperature of outdoor air in a heat exchange ventilation system that can switch between a heat exchange ventilation state in which heat exchange is performed with the air and a normal ventilation state in which ventilation is performed without performing this heat exchange. means (31), and dew condensation detection means (33) for detecting the presence or absence of dew condensation due to the air from the bathroom.
), when the temperature of the outdoor air detected by the temperature detection means (31) is lower than the first predetermined value and the dew condensation state is detected by the dew condensation detection means (33), the temperature is forcibly reduced. A heat exchange ventilation device characterized by comprising: control means (35) for setting an exchange ventilation state. 3. An air supply fan (6) for forcibly supplying air from the outdoors into the room; and an exhaust fan (7) for forcibly exhausting air from the bathroom to the outdoors. The control means (35) further comprises: the temperature of the outdoor air detected by the temperature detection means (31) is at least a second predetermined value that is at least the first predetermined value, and The heat exchange ventilation system according to claim 2, wherein the air supply fan (6) is stopped when the dew condensation state is detected by the dew condensation detection means (33).