JP6514922B2 - Desiccant ventilation fan - Google Patents

Description

The present invention relates to a desiccant ventilation fan that dehumidifies indoors with ventilation.

In general household housing, ventilation is obliged to cope with sick house syndrome. For ventilation of the house, a desiccant ventilation fan that dehumidifies together with ventilation can be used, and a specific example thereof is described in Patent Document 1.
The desiccant ventilation fan described in Patent Document 1 takes outside air from the outside into the supply path by the operation of a blower provided in the supply path (first air path) and supplies the outside air indoors, and the exhaust path (second air path). The indoor air is discharged to the outside via the exhaust passage by the operation of the blower provided in.

Outside air taken from the outside is dehumidified by the desiccant rotor (rotary desiccant type dehumidifier), passed through the cooling means (rotational type sensible heat exchanger), and then sent indoors after being lowered in temperature. The living space can be kept comfortable in a hot and humid environment.
Then, although not described in Patent Document 1, it is designed to supply moisture to the outside air from the desiccant rotor disposed downstream of the cooling means of the air supply passage, and the temperature of the outside air lowered by the cooling means is Furthermore, it can be lowered and supplied indoors.

JP, 2011-94904, A

However, since the blower generates heat during operation, as in the desiccant ventilation fan described in Patent Document 1, the blower is provided further downstream of the desiccant rotor disposed downstream of the cooling means in the supply path. There is a problem that the temperature of the outside air is raised by the heat of the blower before being supplied indoors.
This invention is made in view of this situation, and it aims at providing the desiccant ventilation fan which can send the open air taken in from the outdoors indoors in the state where temperature rise was controlled.

A desiccant ventilation fan according to the present invention, which meets the above object, has an air supply passage for sending outside air indoors and an exhaust passage for discharging the inside air of the room, in the desiccant air ventilating room for ventilating the room. A blower for taking in the outside air, a desiccant rotor A for moving moisture from the inside of the air supply passage to the inside of the exhaust passage, and a downstream side of the desiccant rotor A along the flow of the outside air in the air supply passage. And cooling means for reducing the temperature of the outside air, and a desiccant rotor which is provided downstream of the cooling means along the flow of the outside air in the air supply passage and which imparts moisture to the outside air to reduce the temperature. B, and the blower is disposed between the cooling means in the air supply passage and the desiccant rotor B.

In the desiccant ventilation fan according to the present invention, since the blower is disposed between the cooling means in the air supply passage and the desiccant rotor B, it is possible to avoid heating the outside air whose temperature is lowered by the desiccant rotor B with the heat of the blower. , It is possible to send the outside air taken in from the outside indoors with the temperature rise suppressed.

It is explanatory drawing of the desiccant ventilation fan which concerns on one embodiment of this invention.

Next, embodiments of the present invention will be described with reference to the attached drawings for understanding of the present invention.
As shown in FIG. 1, a desiccant ventilation fan 10 according to an embodiment of the present invention includes an air supply path 12 for sending outside air (outdoor air) 11 indoors and an exhaust path 14 for discharging indoor air (air) 13 indoors. Ventilate the room indoors. The details will be described below.

In the desiccant ventilation fan 10, as shown in FIG. 1, an air supply passage 12 and an air discharge passage 14 are formed in a box-like casing 15, and a blower 16 is provided in the air supply passage 12; The blower 17 is provided. The blowers 16 and 17 are electric blowers that are energized to operate.
At both ends of the air supply passage 12, an outside air intake port 18 for taking the outside air 11 into the casing 15 and an outside air outlet 19 for sending the outside air 11 from the casing 15 indoors are respectively formed. The outside air 11 outside flows into the air supply passage 12 from the outside air intake port 18 by the operation of the blower 16, travels the air supply passage 12 toward the outside air outlet 19, and is released indoors from the outside air outlet 19. Ru. That is, the blower 16 takes the outside air 11 into the air supply passage 12 and sends it outside.

At both ends of the exhaust passage 14, an inside air intake port 20 for taking in the inside air 13 from inside the room into the housing 15 and an inside air outlet 21 for sending out the inside air 13 from the housing 15 to the outside are respectively formed. With the operation of the blower 17, the indoor air 13 in the room flows from the inside air intake port 20 into the exhaust passage 14, travels through the exhaust passage 14 toward the inside air outlet 21, and is discharged from the inside air outlet 21 to the outside. A filter (not shown) is attached to the outside air intake port 18 and the inside air intake port 20.

In the present embodiment, the desiccant ventilation fan 10 is a stationary type that is placed indoors, but the desiccant ventilation fan 10 does not have to be a stationary type and may be, for example, a hanging type. In addition, while ducts are connected to the outside air intake port 18, the outside air outlet 19 and the inside air outlet 21, respectively, no duct is connected to the inside air intake port 20, and the inside air 13 in the room is Is directly taken into the exhaust passage 14 from the inside air intake port 20, but is not limited thereto. For example, a duct may be connected to the inside air intake port 20, and inside air 13 may be taken into the exhaust passage 14 from the inside air intake port 20 via the duct.

In the casing 15, a sensible heat exchanger (an example of a cooling means) 22 through which both the outside air 11 in the air supply passage 12 and the inside air 13 in the exhaust passage 14 pass, and heating means 23 disposed in the exhaust passage 14; A desiccant rotor 24 (dessicant rotor A) is provided to move moisture (moisture) from the side where the relative humidity of the air supply path 12 and the exhaust path 14 is high to the side where the relative humidity is low.
The sensible heat exchanger 22, the heating means 23, the desiccant rotor 24, and the blower 17 are sequentially arranged from the upstream along the flow of the internal air 13 in the exhaust passage 14.

The sensible heat exchanger 22 exchanges heat between the outside air 11 traveling through the air supply passage 12 and the inside air 13 traveling through the exhaust passage 14 to transfer heat from the higher temperature to the lower temperature. In the present embodiment, at the position where the sensible heat exchanger 22 is disposed, the outside air 11 traveling through the air supply passage 12 is at a higher temperature than the inside air 13 traveling through the exhaust passage 14. The heat in the air supply passage 12 is transferred into the exhaust passage 14 to lower the temperature of the outside air 11 in the air supply passage 12.

The heating means 23 raises the temperature of the internal air 13 flowing from the sensible heat exchanger 22 toward the desiccant rotor 24 in the exhaust passage 14 to lower the relative humidity. The inside air 13 whose relative humidity is reduced by passing through the heating means 23 evaporates the moisture absorbed by the desiccant rotor 24 when passing through the desiccant rotor 24 and is sent to the inside air outlet 21 together with the evaporated moisture. Be
In the present embodiment, the heating means 23 is designed to heat the inside air 13 using the heat obtained by supplying the heated water, but the invention is not limited to this. For example, a heat exchanger that heats the inside air 13 using a heat pump cycle may be adopted as the heating means 23.

The desiccant rotor 24 is designed to be rotatable, and by rotating, the part disposed in the exhaust passage 14 moves into the air supply passage 12, and the portion disposed in the air supply passage 12 corresponds to: It moves into the exhaust passage 14. After the desiccant rotor 24 absorbs water from the outside air 11 in the air supply passage 12, the portion disposed in the air supply passage 12 moves into the exhaust air passage 14 and evaporates the absorbed water , Move again into the air supply passage 12 to absorb moisture. By repeating this, the desiccant rotor 24 moves moisture from the inside of the air supply passage 12 to the inside of the air discharge passage 14.

Further, in the casing 15, a bypass passage 25 branched from the air supply passage 12 on the upstream side of the desiccant rotor 24 of the air supply passage 12 is formed. The bypass passage 25 has one end connected to the air supply passage 12 and the other end connected between the sensible heat exchanger 22 of the exhaust passage 14 and the heating means 23, and a part of the outside air 11 taken into the air supply passage 12. To the exhaust line 14. The bypass passage 25 is provided with a flow rate adjustment unit 26 that adjusts the amount of the outside air 11 flowing through the bypass passage 25.

Furthermore, a desiccant rotor 27 (dessicant rotor B) is provided in the housing 15 to move moisture (moisture) from the side where the relative humidity of the air supply path 12 and the bypass path 25 is high to the side where the relative humidity is low. Similar to the desiccant rotor 24, the desiccant rotor 27 is also designed to be rotatable, and by rotating, the portion disposed in the bypass passage 25 moves into the air supply passage 12 and into the air supply passage 12. The portion that was disposed moves into the bypass 25.
The desiccant rotor 27 absorbs the moisture from the outside air 11 flowing through the bypass passage 25 and then moves into the air supply passage 12 and absorbs the outside air 11 flowing through the air supply passage 12. The moisture is given to lower the temperature of the outside air 11, and the moisture is absorbed again in the bypass 25.

The desiccant rotor 24, the sensible heat exchanger 22, the blower 16, and the desiccant rotor 27 are arranged in order from the upstream along the flow of the outside air 11 in the air supply passage 12. That is, the sensible heat exchanger 22 is provided on the downstream side of the desiccant rotor 24 and the desiccant rotor 27 is provided on the downstream side of the sensible heat exchanger 22 along the flow of the outside air 11 in the air supply passage 12. There is. The blower 16 is disposed between the sensible heat exchanger 22 and the desiccant rotor 27 in the air supply passage 12.

Next, the temperature change of the inside air 13 flowing into the exhaust passage 14 and the temperature change of the outside air 11 flowing into the air supply passage 12 will be described.
When passing through the sensible heat exchanger 22, the inside air 13 flowing into the exhaust passage 14 from the inside air intake port 20 exchanges heat with the outside air 11 in the air supply passage 12, the temperature rises, and passes through the heating means 23 Further, after the temperature rises, the moisture contained in the desiccant rotor 24 is evaporated during the passage through the desiccant rotor 24 to lower the temperature, and the temperature is discharged from the inside air outlet 21.

On the other hand, the outside air 11 which has flowed into the air supply passage 12 from the outside air intake port 18 gives moisture to the desiccant rotor 24 to raise the temperature, and then passes through the sensible heat exchanger 22. The heat is exchanged with the temperature 13 to drop the temperature, and after passing through the desiccant rotor 27 and the temperature further drops, it is discharged from the outside air outlet 19.
Therefore, in the air supply passage 12, the outside air 11 on the downstream side of the desiccant rotor 27 is the outside air 11 between the desiccant rotor 24 and the sensible heat exchanger 22, and the outside air 11 between the sensible heat exchanger 22 and the desiccant rotor 27. The temperature is lower.

Here, since the blower 16 disposed in the air supply passage 12 generates heat by operation, the temperature of the outside air 11 is increased depending on the temperature relationship between the outside air 11 passing through the blower 16 and the blower 16 itself. And from the viewpoint of suppressing the temperature rise of the outside air 11 due to the passage of the fan 16, it can be said that the relative temperature of the outside air 11 passing through the fan 16 to the temperature of the fan 16 is better as it is higher.
Note that "suppressing temperature rise" as used herein is a concept that also includes avoiding temperature rise, and the same applies to the following.

In this point, in the air supply passage 12, the temperature of the outside air 11 between the sensible heat exchanger 22 and the desiccant rotor 27 is higher than that of the outside air 11 on the downstream side of the desiccant rotor 27. The temperature of the outside air 11 is not increased by the heat of the blower 16 at the same level as the temperature of 16. On the other hand, the temperature of the outside air 11 downstream of the desiccant rotor 27 is lower than the temperature of the blower 16. If the blower 16 is disposed downstream of the desiccant rotor 27 in the supply passage 12, it passes through the desiccant rotor 27. As a result, the temperature of the outside air 11 is reduced by absorbing the heat of the blower 16.
Therefore, in the present embodiment, since the blower 16 is disposed between the sensible heat exchanger 22 and the desiccant rotor 27, it passes through the blower 16 as compared to the case where the blower 16 is disposed downstream of the desiccant rotor 27. It is possible to suppress the temperature rise of the outside air 11 at that time.

Also, since the temperature of the outside air 11 is higher than the downstream side of the desiccant rotor 27 between the desiccant rotor 24 and the sensible heat exchanger 22, the blower 16 is disposed between the desiccant rotor 24 and the sensible heat exchanger 22. Thus, the temperature rise of the outside air 11 caused by the passage of the blower 16 can be suppressed as compared with the case where the blower 16 is disposed downstream of the desiccant rotor 27. In the present embodiment, in the air supply passage 12, the temperature of the outside air 11 between the desiccant rotor 24 and the sensible heat exchanger 22 is higher than that of the blower 16, and the temperature does not rise due to the heat of the blower 16.
Therefore, by disposing the blower 16 between the desiccant rotor 24 and the desiccant rotor 27 in the air supply passage 12, the outside air 11 can be sent into the room with the temperature rise suppressed.

However, the temperature of the outside air 11 may be higher, for example, 60 ° C. or higher, between the desiccant rotor 24 and the sensible heat exchanger 22 than between the sensible heat exchanger 22 and the desiccant rotor 27. Therefore, when the blower 16 is disposed between the sensible heat exchanger 22 and the desiccant rotor 27, the desiccant rotor 24 and the sensible heat exchanger are considered in consideration of the fact that the upper limit temperature of the allowable use environment differs depending on the model of the blower. As compared with the case where the blower 16 is disposed between 22, it is preferable in that the width of models of the blower that can be adopted for the blower 16 is expanded.

Further, in the present embodiment, a centrifugal blower that blows the outside air 11 in the centrifugal direction of the blower 16 (a rotating body with a blade included in the blower 16) is adopted as the blower 16. The centrifugal fan is a space in which air is blown out as compared with an axial flow fan which blows air in the axial direction of the rotor with blades, and a diagonal flow blower which blows air obliquely to the axial direction of the rotor with blades. It can increase static pressure.

When the static pressure of the space where the blower 16 blows the outside air 11 in the air supply passage 12 is high, the outside air 11 blown out of the blower 16 is uniformly supplied to each region of the cross section of the air supply passage 12 As a result, the temperature drop of the outside air 11 due to the passage of the desiccant rotor 27 can be increased.
In the present embodiment, a turbo fan having a high static pressure effect is used as the blower 16 among the centrifugal blowers. Therefore, the temperature of the outside air 11 passing through the desiccant rotor 27 and supplied indoors may be a sirocco fan or the like. It can be stably lowered compared to using.

Moreover, since the blower 16 blows the outside air 11 radially toward the inner wall of the air supply passage 12, the outside air 11 discharged from the blower 16 moves in the direction to collide with the inner wall, and then changes its traveling direction, It will head to the rotor 27. Therefore, compared with the case where the outside air 11 is blown out toward the desiccant rotor 27, the outside air 11 can be uniformly supplied to each region of the cross section of the air supply passage 12 on the blowout side of the outside air 11 of the blower 16. .
Here, in terms of uniformly supplying the outside air 11 to the respective regions of the cross section of the air supply passage 12, it is also effective to provide a rectifying member between the blower 16 and the desiccant rotor 27.

Further, in the present embodiment, the space between the sensible heat exchanger 22 and the desiccant rotor 27 in the air supply passage 12 is divided into two spaces by the shielding member 28 provided at the arrangement position of the blower 16 and the blower 16. (Hereinafter, the sensible heat exchanger 22 side is referred to as a space 29, and the desiccant rotor 27 side is referred to as a space 30).
In the blower 16, since the suction portion 31 of the outside air 11 is disposed in the space 29, and the blowout portion 32 of the outside air 11 is disposed in the space 30, the static pressure in the space 30 can be stably increased. It is possible. In the present embodiment, the blowout portion 32 is provided on the entire outer periphery of the blower 16.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the above-mentioned form, The change of the conditions which do not deviate from a summary, etc. are all the application scope of this invention.
For example, the cooling means need not be a sensible heat exchanger that exchanges heat between the outside air in the supply passage and the inside air in the exhaust passage, and may cool the outside air in the supply passage with cold water or cold air.
Moreover, a housing is not limited to box shape, Another shape may be sufficient.
The desiccant rotors A and B, the cooling means, the heating means, and the two blowers do not have to be housed in one housing, for example, they may be dispersed and housed in a plurality of housings. .
Furthermore, the bypass passage is not necessarily required, and in the case where the bypass passage is not provided, an independent separate flow passage may be provided to take in the outside air and supply it to the desiccant rotor.

10: desiccant fan, 11: outside air, 12: air supply path, 13: inside air, 14: exhaust path, 15: housing, 16 and 17: blower, 18: outside air intake, 19: outside air outlet, 20: inside air intake Mouth, 21: internal air outlet, 22: sensible heat exchanger, 23: heating means, 24: desiccant rotor, 25: bypass path, 26: flow rate adjustment unit, 27: desiccant rotor, 28: shielding member, 29, 30: Space, 31: Suction part, 32: Blowing out part

Claims (1)

A desiccant ventilation fan for ventilating the inside of the room, comprising a supply path for sending outside air indoors and an exhaust path for discharging the inside air of the room,
A blower for taking the outside air into the air supply passage;
A desiccant rotor A for moving moisture from the inside of the air supply path to the inside of the exhaust path;
Cooling means provided downstream of the desiccant rotor A along the flow of the outside air in the air supply passage, for reducing the temperature of the outside air;
A desiccant rotor B provided on the downstream side of the cooling means along the flow of the outside air in the air supply path, for supplying moisture to the outside air to lower the temperature;
A desiccant ventilation fan, wherein the blower is disposed between the cooling means in the air supply passage and the desiccant rotor B.

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