JP7507334B2 - Heat exchange type ventilation system with humidification function - Google Patents

Description

The present invention relates to a heat exchange type ventilation device with a humidifying function for use in residential spaces, etc.

Conventionally, heat exchange ventilation devices that exchange heat between the intake air flow and the exhaust air flow during ventilation have been known as devices that can ventilate while suppressing the reduction in the cooling or heating effect.

Since these heat exchange ventilators have the ability to exchange latent heat in addition to sensible heat, they can also keep the air moist indoors, but this alone is not enough to prevent a drop in indoor relative humidity in winter when outdoor absolute humidity is low. Therefore, a heat exchange ventilator with a humidifying function has been developed as a heat exchange ventilator, in which a humidifier is provided downstream of the intake air duct (see, for example, Patent Document 1). With this configuration, humidified air can be supplied indoors, and a drop in indoor relative humidity in winter can be suppressed.

JP 2015-143595 A

However, in conventional heat exchange ventilators with humidification function, the intake air flow that has been heat exchanged in the heat exchange ventilator is introduced directly into the humidifier, so humidification cannot be continued if the intake air from the heat exchange ventilator stops and the intake air flow is no longer introduced.

The present invention aims to solve the above-mentioned problems of the conventional technology and provide a heat exchange ventilation device with a humidification function that can continue humidifying even when the supply airflow from the heat exchange ventilation device stops flowing.

To achieve this object, the heat exchange type ventilation device with humidification function according to the present invention comprises a heat exchange type ventilation device that exchanges heat between an exhaust air flow that flows through an exhaust air duct for discharging indoor air to the outdoors and an intake air flow that flows through an intake air duct for supplying outdoor air to the indoors, a humidifier that humidifies the intake air flow after heat exchange, an air blower configured to transport indoor air to the humidifier, and a control unit that controls the operation of the humidifier and the operation of the air blower. The control unit is characterized in that when the flow of the intake air flow from the heat exchange type ventilation device to the humidifier is stopped, the control unit controls the indoor air transported from the air blower to be circulated to the humidifier.

The heat exchange ventilator with humidification function of the present invention can provide a heat exchange ventilator with humidification function that can continue humidification even if the supply air flow from the heat exchange ventilator stops.

FIG. 1 is a schematic diagram showing an example of installation of a heat-exchange type ventilator with a humidifying function according to a first embodiment of the present invention in a house. FIG. 2 is a schematic diagram showing the configuration of the heat exchange type ventilator with humidification function. FIG. 3 is a block diagram showing the configuration of the control unit in the heat exchange type ventilator with humidification function. FIG. 4 is a flow chart showing the process performed by the processing section of the control section in the heat exchange type ventilator with humidification function.

The heat exchange type ventilation device with humidification function according to the present invention includes a heat exchange type ventilation device that exchanges heat between an exhaust air flow that flows through an exhaust air duct for discharging indoor air to the outdoors and an intake air flow that flows through an intake air duct for supplying outdoor air to the indoors, a humidifier that humidifies the intake air flow after heat exchange, an air blower configured to transport indoor air to the humidifier, and a control unit that controls the operation of the humidifier and the operation of the air blower. When the flow of the intake air flow from the heat exchange type ventilation device to the humidifier is stopped, the control unit controls the humidifier to circulate the indoor air transported to the air blower.

With this configuration, even if the supply airflow from the heat exchange ventilator to the humidifier stops, air can be supplied to the humidifier, and humidification can continue. In other words, it is possible to create a heat exchange ventilator with humidification function that can continue humidification even if the supply airflow from the heat exchange ventilator stops.

In addition, in the heat exchange type ventilation device with humidification function according to the present invention, the control unit may be configured to control the transportation of indoor air from the blower to the humidifier when the flow of the supply air from the heat exchange type ventilation device to the humidifier resumes.

With this configuration, when the flow of supply air from the heat exchange ventilation device to the humidifier resumes, the increase in the volume of air supplied to the humidifier can be suppressed, preventing the room from becoming overly humidified.

The heat exchange ventilator with humidification function according to the present invention may be further configured to control the operation of the heat exchange ventilator so as to stop or resume the flow of the supply air from the heat exchange ventilator to the humidifier based on temperature information about the outdoor air and humidity information about the indoor air.

With this configuration, the flow of the supply air from the heat exchange ventilation device to the humidifier is stopped or restarted depending on the temperature information related to the outdoor air and the humidity information related to the indoor air, so condensation or freezing of the heat exchange ventilation device can be prevented.

The heat exchange type ventilator with humidification function according to the present invention further includes a memory unit that stores the absolute humidity of the humidified air humidified by the humidifier. The control unit may be configured to control the amount of humidification of the indoor air transported from the blower to the humidifier when the flow of the supply air from the heat exchange type ventilator to the humidifier is stopped, so as to maintain the absolute humidity of the humidified air stored in the memory unit at the time when the flow of the supply air was stopped.

With this configuration, the absolute humidity of the humidified air supplied indoors is maintained at a preset condition before and after the supply air flow from the heat exchange ventilation device to the humidifier is stopped, so indoor air can be continuously humidified without compromising the comfort of indoor occupants.

In addition, in the heat exchange ventilation device with humidification function according to the present invention, the control unit may be configured to control the amount of humidification of the indoor air transported from the blower to the humidifier based on humidity information about the indoor air.

This configuration allows the humidified state to be maintained, making it comfortable for indoor occupants, even after the flow of supply air from the heat exchange ventilation device to the humidifier is stopped.

The following describes an embodiment of the present invention with reference to the drawings.

(Embodiment 1)
First, the equipment configuration of a heat exchanger type ventilator with humidification function 4 according to embodiment 1 of the present invention will be described with reference to Figures 1 and 2. Figure 1 is a schematic diagram showing an example of installation of a heat exchanger type ventilator with humidification function 4 according to embodiment 1 of the present invention in a house 1. Figure 2 is a schematic diagram showing the equipment configuration of the heat exchanger type ventilator with humidification function 4.

1, the heat exchange type ventilation device 4 with humidification function is installed between floors or in the attic of the house 1, and is composed of a heat exchange type ventilation device 5, a humidifier 6, and a blower 7. The heat exchange type ventilation device 4 with humidification function ventilates the indoor air 2 (exhaust air flow 15 described later) and the outdoor air 3 (supply air flow 16 described later) while exchanging heat in the heat exchange type ventilation device 5, while humidifying the air (circulation flow 17 described later) transported from the indoor air 2 by the supply air flow 16 and the blower 7 as necessary in the humidifier 6 and introducing it into the indoor air 2. In other words, the heat exchange type ventilation device 4 with humidification function ventilates the indoor air 2, and transfers the heat of the exhaust air flow 15 to the supply air flow 16 during ventilation, suppressing the release of unnecessary heat. Furthermore, the supply air flow 16 is humidified to suppress a decrease in the humidity of the air in the indoor air 2 (indoor relative humidity). In particular, in the heat exchange type ventilation device 4 with humidification function according to the first embodiment, when the supply air flow from the heat exchange type ventilation device 5 stops flowing, the circulation flow 17 conveyed from the blower device 7 is circulated in place of the supply air flow 16, and humidification is performed by the humidifier 6.

Here, the exhaust air flow 15 is an air flow that exhausts the air inside the room 2 to the outside 3. The exhaust air flow 15 is first transported from the room 2 to the heat exchange type ventilation device 5 through the return air duct 9. The exhaust air flow 15 that has been heat exchanged with the supply air flow 16 in the heat exchange type ventilation device 5 is exhausted from the heat exchange type ventilation device 5 to the outside 3 through the exhaust air duct 10. The return air duct 9 is arranged to connect each room of the house 1 to the heat exchange type ventilation device 5. The exhaust air duct 10 is arranged to connect the heat exchange type ventilation device 5 to an exhaust port provided on the exterior wall surface of the house 1.

The intake air flow 16 is an air flow that introduces the air from the outdoors 3 into the indoors 2. The intake air flow 16 is first transported from the outdoors 3 to the heat exchange type ventilation device 5 through the outside air duct 11. The intake air flow 16 that has been heat exchanged with the exhaust air flow 15 in the heat exchange type ventilation device 5 is transported from the heat exchange type ventilation device 5 to the humidifier 6 through the relay air duct 12. The intake air flow 16 that has been humidified as necessary in the humidifier 6 is introduced from the humidifier 6 into the indoors 2 through the intake air duct 13. The outside air duct 11 is arranged to connect the intake air port provided on the outer wall surface of the house 1 to the heat exchange type ventilation device 5. The relay air duct 12 is arranged to connect the heat exchange type ventilation device 5 and the humidifier 6. The intake air duct 13 is arranged to connect the humidifier 6 to each room of the house 1.

The circulating flow 17 is an air flow that humidifies the air in the room 2 and introduces it back into the room 2. The circulating flow 17 is first transported from the room 2 to the humidifying device 6 through the blower 7 and the circulating air duct 14. The circulating flow 17 that has been humidified in the humidifying device 6 replaces the supply air flow 16 and is introduced from the humidifying device 6 into the room 2 through the supply air duct 13. The circulating air duct 14 is arranged to connect the blower 7 and the humidifying device 6. In the following, the humidified supply air flow 16 and the humidified circulating flow 17 are sometimes referred to as "supply air SA" or "humidified air".

Next, we will explain the specific configuration of the heat exchange ventilator with humidification function 4.

As shown in FIG. 2, the heat exchanger ventilator 4 with humidification function is configured to have a heat exchanger ventilator 5, a humidifier 6, and a blower 7. The heat exchanger ventilator 4 with humidification function also has an OA temperature sensor 19 and an RA humidity sensor 20. The heat exchanger ventilator 5, the humidifier 6, and the blower 7 are each configured to have their operation controlled by a control unit 8 (see FIG. 3) described later.

The heat exchange type ventilation device 5 is a device that ventilates while exchanging heat between the indoor air RA (exhaust air flow 15) 2 and the outdoor air OA (supply air flow 16) 3. Specifically, as shown in FIG. 2, the heat exchange type ventilation device 5 is equipped with a return air vent 5a, an exhaust air vent 5b, an outside air vent 5c, an intake air vent 5d, a heat exchange element 5e, a humidity sensor 5f, an exhaust fan 5g, and an intake air fan 5h.

The return air vent 5a is an intake port that takes in indoor air RA (exhaust air flow 15) from the return air duct 9 (see FIG. 1) into the heat exchange type ventilation device 5. The exhaust air vent 5b is an outlet port that expels the exhaust air flow 15 from the heat exchange type ventilation device 5 to the exhaust air duct 10 (see FIG. 1) as exhaust air EA. The outside air vent 5c is an intake port that takes in the supply air flow 16 from the outside air duct 11 (see FIG. 1) into the heat exchange type ventilation device 5. The supply air vent 5d is an outlet port that expels the supply air flow 16 from the heat exchange type ventilation device 5 into the relay air duct 12.

The heat exchange element 5e is a member for exchanging heat (sensible heat and latent heat) between the exhaust air flow 15 and the intake air flow 16. The heat exchange element 5e is a total heat exchange element formed of heat transfer paper (heat transfer plate) based on cellulose fiber. However, the material is not limited to this. For example, a moisture-permeable resin film based on polyurethane or polyethylene terephthalate, or a paper material based on cellulose fiber, ceramic fiber, or glass fiber can be used as the heat transfer plate constituting the heat exchange element 5e. In addition, the heat transfer plate constituting the heat exchange element 5e can be a thin sheet with heat conductivity and a property that gas does not pass through. In this case, the heat exchange element 5e becomes a sensible heat exchange element.

The humidity sensor 5f is a sensor that detects the humidity of the exhaust air flow 15 taken in through the return air port 5a, and is used as an input signal for the control unit 8 described later. The exhaust fan 5g is a blower that takes in the exhaust air flow 15 through the return air port 5a and expels it from the exhaust port 5b. The supply air fan 5h is a blower that takes in the supply air flow 16 through the outside air port 5c and expels it from the supply air port 5d.

In addition, inside the heat exchange ventilation device 5, there is an internal exhaust air duct that connects the return air port 5a and the exhaust air port 5b, and an internal supply air duct that connects the outside air port 5c and the supply air port 5d.

When performing heat exchange ventilation, the heat exchange ventilation device 5 operates the exhaust fan 5g and the supply air fan 5h, and exchanges heat in the heat exchange element 5e between the exhaust air flow 15 flowing through the internal exhaust air duct and the supply air flow 16 flowing through the internal supply air duct. As a result, when performing ventilation, the heat exchange ventilation device 5 transfers the heat of the exhaust air flow 15 discharged to the outdoor 3 to the supply air flow 16 that is taken into the indoor 2, suppressing the release of unnecessary heat and recovering heat to the indoor 2. As a result, when performing ventilation in winter, the temperature drop of the indoor 2 can be suppressed by the air with a low temperature of the outdoor 3. On the other hand, when performing ventilation in summer, the temperature rise of the indoor 2 can be suppressed by the air with a high temperature of the outdoor 3. The heat exchange ventilation device 5 is controlled to be turned on and off according to an output signal (hereinafter, heat exchange output information) from the control unit 8 described later.

Next, the humidifier 6 is a device that humidifies the intake air flow 16 after heat exchange from the heat exchange type ventilation device 5 or the indoor air 2 (circulation flow 17) from the blower 7 as necessary. Specifically, as shown in FIG. 2, the humidifier 6 has an intake air inlet 6a, a circulation inlet 6b, an intake air outlet 6c, and a humidifier 6d.

The supply air inlet 6a is an intake port that takes in the supply air flow 16 from the relay air duct 12 into the humidifier 6. The circulation inlet 6b is an intake port that takes in the circulation flow 17 from the circulation air duct 14 into the humidifier 6. The supply air outlet 6c is an outlet that expels the air humidified by the humidifier 6 (the supply air flow 16 from the heat exchange type ventilation device 5 or the circulation flow 17 from the blower 7) into the supply air duct 13 (see Figure 1) as supply air SA.

The humidifier 6d is a unit for humidifying the intake airflow 16 from the heat exchange type ventilation device 5 or the circulating airflow 17 from the blower 7. The humidifier 6d has a humidification motor 6e and a humidification nozzle 6f. The humidifier 6d uses the humidification motor 6e to rotate the humidification nozzle 6f, sucking up stored water by centrifugal force and scattering, colliding, and crushing it in the surroundings (centrifugal direction), thereby moistening the air passing through. The humidifier 6d then changes the rotation speed (hereinafter, rotation output value) of the humidification motor 6e in response to an output signal from the control unit 8, which will be described later, to adjust the humidification capacity (amount of humidification).

The liquid added to the air by the humidifier 6d may be something other than water, such as hypochlorous acid water that has bactericidal or deodorizing properties. In this case, the hypochlorous acid water can be added to the intake air flow 16 and supplied to the indoor space 2 to sterilize or deodorize the indoor space 2.

Next, the blower 7 is a device configured to transport the air RA (circulation flow 17) from the room 2 to the humidifier 6. Specifically, as shown in Figures 1 and 2, the blower 7 is installed between floors or in the attic of the room 2, and is a device for taking in the air RA from the room 2 through the ceiling surface and transporting it to the humidifier 6. The on/off operation of the blower 7 is controlled according to an output signal (hereinafter, blower output information) from the control unit 8 described later.

As shown in FIG. 2, the OA temperature sensor 19 is a sensor that is installed outdoors 3 and detects the temperature of the air OA outdoors 3. The OA temperature sensor 19 outputs the detected temperature information regarding the air OA outdoors 3 to the control unit 8 described later.

As shown in FIG. 2, the RA humidity sensor 20 is installed in the room 2 and is a sensor that detects the humidity of the air RA in the room 2. The RA humidity sensor 20 outputs the detected humidity information regarding the air RA in the room 2 to the control unit 8 described later. Note that the humidity information from the humidity sensor 5f of the heat exchange type ventilation device 5 may be substituted by the humidity information from the RA humidity sensor 20.

Next, the control during humidification operation by the heat exchanger ventilator with humidification function 4 according to the first embodiment will be described with reference to Figs. 3 and 4. Fig. 3 is a block diagram showing the configuration of the control unit 8 in the heat exchanger ventilator with humidification function 4. Fig. 4 is a flow chart showing the processing performed by the processing unit 8b of the control unit 8 in the heat exchanger ventilator with humidification function 4.

The control unit 8 controls the operation of the heat exchange type ventilation device 5, the humidifier 6, and the blower 7. Specifically, as shown in FIG. 3, the control unit 8 has an input unit 8a, a processing unit 8b, an output unit 8c, a memory unit 8d, and a timing unit 8e. The input unit 8a receives information on the humidification operation and the set humidity (target humidity) of the air RA of the indoors 2 output from the operation panel 18 installed in the indoors 2, information on the humidity of the air RA of the indoors 2 (first indoor humidity) output from the humidity sensor 5f of the heat exchange type ventilation device 5, information on the temperature (outdoor temperature) of the air OA of the outdoor 3 output from the OA temperature sensor 19 installed in the outdoor 3, and information on the humidity of the air RA of the indoors 2 (second indoor humidity) output from the RA humidity sensor 20 installed in the indoors 2, and outputs the information to the processing unit 8b.

The processing unit 8b performs a predetermined process at regular intervals (for example, 5 minutes) based on the time information output from the timer unit 8e. Specifically, the processing unit 8b calculates the humidification output to bring the indoor humidity closer to the target humidity using the past indoor humidity, past humidification output value, and calculation parameters output from the memory unit 8d, and the current indoor humidity (first indoor humidity, second indoor humidity) output from the input unit 8a, and specifies the rotation output value (the number of rotations of the humidification motor 6e in the humidifier 6d) for the humidifier 6 based on the calculated humidification output, and outputs it to the output unit 8c. The processing unit 8b also specifies the heat exchange output information for the heat exchange type ventilation device 5 (information on the on/off operation of the heat exchange type ventilation device 5) and the air output information for the air blower 7 (information on the on/off operation of the air blower 7) using the current outdoor 3 temperature information and indoor 2 humidity information output from the input unit 8a, and outputs them to the output unit 8c.

The memory unit 8d stores past humidity information, past rotation output values, and calculation parameters, and also receives and stores current indoor humidity information, current rotation output values, current heat exchange output information, and air output information output from the processing unit 8b. Each piece of stored information is output from the memory unit 8d to the processing unit 8b in response to a request from the processing unit 8b.

The output unit 8c outputs the rotation output value received from the processing unit 8b to the humidifier 6 (humidification motor 6e of the humidifier 6d). The output unit 8c also outputs the airflow output information received from the processing unit 8b to the air blower 7. The output unit 8c also outputs the heat exchange output information received from the processing unit 8b to the heat exchanger type ventilation device 5. The heat exchanger type ventilation device 5 then performs on/off of the heat exchanger operation based on the heat exchanger output information output from the output unit 8c. The humidifier 6 performs the humidification operation according to the rotation output value output from the output unit 8c. The air blower 7 also performs on/off of the air blower operation based on the airflow output information output from the output unit 8c.

Next, we will explain the processing flow performed by the processing unit 8b of the control unit 8 in the heat exchange type ventilation device 4 with humidification function.

As shown in FIG. 4, the processing unit 8b of the control unit 8 is mainly composed of four steps (steps S01 to S04), and starts the humidification process while performing heat exchange ventilation in response to a control signal from the operation panel 18. Note that at the start of the humidification process, the blower 7 is not in operation and is in a stopped state.

Step S01 is a step for performing processing at the processing interval stored in the memory unit 8d. For example, if the processing interval is 5 minutes, the processing unit 8b receives time information output from the timer unit 8e and repeats time determination until 5 minutes have elapsed, at which point the processing proceeds to step S02. When determining the time, a control signal from the operation panel 18 is received at a later stage, and if an end signal is received as the control signal, the humidification process ends. Note that heat exchange ventilation continues even after the humidification process ends.

Step S02 is a step for updating the rotation output value in humidification. Here, the processing unit 8b updates the rotation output value based on the various information output from the input unit 8a and the memory unit 8d, and proceeds to step S03. Note that the calculation formula used for updating can be, for example, the speed-type PID (Proportional Integral Differential) control formula shown in the following formula (1).

R = R + Kp * [(ΔX0 - ΔX1)
+ (1/Ti) * ΔX0 + Td * {(ΔX0-ΔX1)-(ΔX1-ΔX2)}}
...Equation (1)
where R is the rotation output value, Kp, Ti, and Td are PID parameters, and ΔX0, ΔX1, and ΔX2 are values based on the current, previous, and second previous "target humidity-indoor humidity", respectively.

Step S03 is a step for identifying the operation of the heat exchange ventilation device (stop or restart of the heat exchange ventilation device). Based on the current temperature information of the outdoor air OA 3 and the humidity information of the indoor air RA 2 output from the input unit 8a, the processing unit 8b outputs heat exchange output information that identifies whether the heat exchange ventilation device 5 is operating or stopped, and proceeds to step S04. Note that the conditional formula used to identify the heat exchange output information can be, for example, the logical formula shown in the following formula (2).

P = [{(t_OA-T)/|t_OA-T|+1}/2]
*[{(X−x_RA)/|X−x_RA|+1)}/2] ... Formula (2)
However, this does not apply when t_OA=T and x_RA=X are included, and when t_OA=T and x_RA>X, or when t_OA<T and x_RA=X, P=0, otherwise P=1. Here, P is heat exchange output information, P=1 means operation, and P=0 means stop. Furthermore, T and X are the reference temperature and reference humidity, and t_OA and x_RA are the current outdoor temperature and indoor humidity, respectively. In this embodiment, the heat exchange operation is stopped when the indoor temperature is below -30°C to prevent freezing inside the device, so T=-30 and X=100 are set.

Step S04 is a step for determining the operation of the blower 7 according to the set operating status of the heat exchange ventilation device 5. As shown in FIG. 4, step S04 mainly consists of three processes (steps S04A to S04C). The process flow for each step is described in detail below.

Step S04A is a step of stopping the operation of the blower device 7 when the heat exchange output information identified in step S03 is P = 1 (operating). Specifically, if the blower device 7 has stopped operating, it remains stopped, and if the blower device 7 is operating, it stops operating. In other words, step S04A can also be said to be a step of stopping the transport of the circulating flow 17 from the blower device 7. Here, the processing unit 8b outputs blower operation off information as the blower output information. Then, the process returns to step S01.

Step S04B is a step of starting the operation of the blower device 7 or a step of continuing the operation of the blower device 7 when the heat exchange output information identified in step S03 is P = 0 (stopped). In other words, step S04B can also be said to be a step of starting or continuing the transport of the circulating flow 17 from the blower device 7. Here, the processing unit 8b outputs on information of the blower operation as the blower output information. Then, the process proceeds to step S04C.

Step S04C is a step of determining the amount of humidification for the circulating flow 17 from the blower 7. Here, the processing unit 8b determines the amount of humidification for the circulating flow 17 (the rotation output value of the humidifying device 6) based on the absolute humidity information of the humidified air (humidified supply air flow 16) at the time when the flow of the supply air flow 16 from the heat exchange type ventilation device 5 to the humidifying device 6 stops (or immediately before it stops) stored in the memory unit 8d. Specifically, the absolute humidity of the humidified air at the time when the flow of the supply air flow 16 stops, stored in the memory unit 8d, is compared with the absolute humidity of the air RA (circulating flow 17) in the room 2, and the amount of humidification for the circulating flow 17 (the rotation output value of the humidifying device 6) is determined so as to maintain the absolute humidity of the humidified air at the time when the flow of the supply air flow 16 stops, and is output to the output unit 8c. Then, as in step S01, after a certain time (for example, 5 minutes) has passed, the process returns to step S03.

By the processing of step S04C, even if the flow of the supply air flow 16 from the heat exchange type ventilation device 5 is stopped, it is possible to humidify the air RA in the room 2 at a constant speed by the circulating flow 17 transported by the operation of the blower 7. In this embodiment, while the flow of the supply air flow 16 from the heat exchange type ventilation device 5 to the humidifier 6 is stopped, the required amount of humidification is determined only by the humidity information related to the circulating flow 17 transported from the room 2, and is performed by controlling the rotation output value of the humidifier 6.

As described above, the control unit 8 controls the operation of the heat exchange ventilation device 5, the humidifier 6, and the blower 7 by continuously performing the above-mentioned processing in the processing unit 8b.

As described above, the heat exchange ventilation device 4 with humidification function according to embodiment 1 provides the following effects.

(1) In the heat exchange type ventilation device 4 with humidification function, when the flow of the supply air flow 16 from the heat exchange type ventilation device 5 to the humidification device 6 stops, the circulating flow 17 conveyed from the air blower 7 is circulated in place of the supply air flow to perform humidification. By doing so, even if the flow of the supply air flow 16 from the heat exchange type ventilation device 5 to the humidification device 6 stops to prevent condensation or freezing inside the device, air (circulating flow 17) is circulated to the humidification device 6 through the air blower 7, so that humidification can continue. In other words, it is possible to provide a heat exchange type ventilation device 4 with humidification function that can continue humidification even if the flow of the supply air flow 16 from the heat exchange type ventilation device 5 stops.

(2) In the heat exchange type ventilation device 4 with humidification function, when the supply air flow 16 from the heat exchange type ventilation device 5 to the humidifier 6 is resumed, the circulation flow 17 flowing from the blower 7 to the humidifier 6 is stopped. By doing so, when the supply air flow 16 is resumed due to the operation of the heat exchange type ventilation device 5, a sudden increase in the total volume of air flowing into the humidifier 6 can be suppressed, and excessive humidification of the indoor space 2 due to an excess of supply air can be prevented.

(3) In the heat exchange ventilator 4 with humidification function, the flow of the supply air flow 16 from the heat exchange ventilator 5 to the humidifier 6 is stopped or resumed using temperature information on the outdoor air OA 3 and humidity information on the indoor air RA 2. In this way, the flow of the supply air flow from the heat exchange ventilator 5 to the humidifier 6 is stopped or resumed depending on the temperature of the outdoor air OA 3 and the humidity of the indoor air RA 2, so condensation or freezing of the heat exchange ventilator 5 can be prevented in advance.

(4) In the heat exchange ventilator 4 with humidification function, the absolute humidity of the humidified air supplied to the room 2 is maintained at a preset condition before and after the supply air flow 16 from the heat exchange ventilator 5 to the humidifier 6 is stopped. In this way, the air RA in the room 2 can be continuously humidified without compromising the comfort of the users in the room 2.

(5) In the heat exchange type ventilation device 4 with humidification function, the amount of humidification of the air RA in the room 2 transported from the blower 7 to the humidifier 6 is controlled based on humidity information about the air RA in the room 2. In this way, a humidified state that is comfortable for users in the room 2 can be maintained even after the flow of the supply air flow 16 from the heat exchange type ventilation device 5 to the humidifier 6 is stopped.

The present invention has been described above based on embodiments. These embodiments are merely examples, and it will be understood by those skilled in the art that various modifications are possible in the combination of each component or each treatment process, and that such modifications are also within the scope of the present invention.

In the humidifier 6 constituting the heat exchange type ventilation device with humidification function 4 according to the first embodiment, the humidifier 6d is configured as a centrifugal crushing type, but is not limited to this. For example, the humidifier 6d may be configured as an ultrasonic type that scatters water droplets using ultrasonic waves, a heating type that generates water vapor by heating, an evaporation type that evaporates water by passing air through a filter or the like covered with water, or a combination of these. When using these, the amplitude of the ultrasonic waves, the amount of heat, and the amount of water dripping onto the filter can be used as parameter values corresponding to the output capacity value.

The blower 7 constituting the heat exchange ventilation device with humidification function 4 according to the first embodiment is configured to have a fixed blowing capacity (air volume) and to be controlled only by turning the operation on/off in response to the blowing output information from the control unit 8, but is not limited to this. For example, the blower 7 may be configured to control the blowing capacity of the blower 7 as variable when the operation is on, in addition to controlling the operation of the blower 7 on/off. This can improve the degree of freedom in setting when determining the amount of humidification for the circulating flow 17 in step S04C.

The heat exchange type ventilation device with humidification function of the present invention is useful as a heat exchange type ventilation device that enables heat exchange between indoor air and outdoor air and has a humidification function.

REFERENCE SIGNS LIST 1 House 2 Indoors 3 Outdoors 4 Heat exchange type ventilation device with humidification function 5 Heat exchange type ventilation device 5a Return air vent 5b Exhaust air vent 5c Outdoor air vent 5d Air supply vent 5e Heat exchange element 5f Humidity sensor 5g Exhaust fan 5h Air supply fan 6 Humidifier 6a Air supply inlet 6b Circulation inlet 6c Air supply outlet 6d Humidifier 6e Humidification motor 6f Humidification nozzle 7 Blower 8 Control unit 8a Input unit 8b Processing unit 8c Output unit 8d Memory unit 8e Timer 9 Return air duct 10 Exhaust air duct 11 Outdoor air duct 12 Relay air duct 13 Air supply duct 14 Circulation air duct 15 Exhaust air flow 16 Air supply flow 17 Circulation flow 18 Operation panel 19 OA temperature sensor 20 RA humidity sensor

Claims (4)

a heat exchange type ventilation device that exchanges heat between an exhaust air flow passing through an exhaust air duct for discharging indoor air to the outdoors and an intake air flow passing through an intake air duct for supplying outdoor air to the indoors;
a humidifier for humidifying the intake airflow after heat exchange;
A blower configured to transport the indoor air to the humidifier;
A control unit that controls an operation of the humidifier and an operation of the blower;
Equipped with
The control unit is
A memory unit is provided for storing the absolute humidity of the air humidified by the humidifier,
When the flow of the supply air from the heat exchange type ventilation device to the humidifier is stopped,
Controlling the indoor air delivered from the air blower to the humidifier;
A heat exchange type ventilation device with a humidifying function, characterized in that the amount of humidification of the indoor air transported from the blower to the humidifier is controlled so as to maintain the absolute humidity of the humidified air at the time the flow of the supply air flow is stopped, as stored in the memory unit. The heat exchange type ventilation device with humidification function according to claim 1, characterized in that the control unit controls the amount of humidification of the indoor air transported from the blower to the humidifier based on humidity information about the indoor air. The heat exchanger type ventilation device with humidification function according to claim 1 or 2, characterized in that the control unit controls the transport of the indoor air from the blower to the humidifier to be stopped when the flow of the supply air flow from the heat exchanger type ventilation device to the humidifier is resumed. The heat exchanger type ventilator with humidification function as described in claim 3, characterized in that the control unit further controls the operation of the heat exchanger type ventilator, and controls to stop or resume the flow of the supply air flow from the heat exchanger type ventilator to the humidifier based on temperature information regarding the outdoor air and humidity information regarding the indoor air.

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