WO2017110055A1

WO2017110055A1 - Heat exchange type ventilation device

Info

Publication number: WO2017110055A1
Application number: PCT/JP2016/005095
Authority: WO
Inventors: 将秀福本; 洋祐浜田; 元気畑
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2015-12-22
Filing date: 2016-12-09
Publication date: 2017-06-29
Also published as: CN108369018A; US20180372361A1

Abstract

The purpose of the present invention is to provide a heat exchange type ventilation device for minimizing clogging due to frost formation in an air exhaust path. The heat exchange type ventilation device (2) is provided with an air supply blower part (8), an air exhaust blower part (5), a heat exchange element (4), and a pressure regulating part (16). The air supply blower part (8) supplies outdoor air to indoors. The air exhaust blower part (5) exhausts indoor air to outdoors. The heat exchange element (4) has a heat transfer plate. The heat transfer plate provides a partition between an air supply path (21) via which a supply air flow (15) generated by the air supply blower part (8) is circulated, and an exhaust air path (20) via which an exhaust air flow (14) generated by the air exhaust blower part (5) is circulated, sensible heat or total heat being exchanged between the air supply path (21) and the air exhaust path (20). The pressure regulating part (16) is positioned upstream of the heat exchange element (4) of the air supply path (21), and regulates the pressure of the supply air flow (15).

Description

Heat exchange ventilator

The present invention relates to a heat exchange type ventilator provided with a heat exchange element.

In recent years, with the global warming, energy saving in the residential area has been emphasized. Among the energy consumption of houses, the energy consumption of hot water supply, lighting, and air conditioning is relatively large. Therefore, a technique for reducing these energy consumptions is strongly desired.

When paying attention to energy consumption of air conditioning, there is heat escaping from the housing of the house (cooling in the case of cooling) and heat escaping by ventilation. The heat escaping from the housing of the house has been significantly reduced due to the significant improvement in the insulation and airtightness of the house over the last few decades. On the other hand, in order to reduce the heat escaped by ventilation, a heat exchange type ventilator that exchanges heat between supplied air and exhausted air is effective. The heat exchange ventilator includes a heat exchange element that exchanges heat between supplied air and exhausted air.

熱 Heat exchange type ventilators are particularly desired in cold regions where the temperature difference between indoors and outdoors is large. However, when the outside air is cold in a cold region, frost is generated inside the heat exchange element, which causes a problem that the exhaust air passage is easily clogged. This is because the warm and humid air in the room is cooled by the cold outside air to a low temperature, and moisture in the air is frozen. In particular, frost formation is prominent on the exhaust air passage side in a region where the inlet of the supply air passage and the outlet of the exhaust air passage are in contact with each other via a heat transfer plate inside the heat exchange element.

As a general countermeasure against frost formation, a heat exchange type ventilator for cold districts, for example, warms the outside air with a heater and introduces it into the heat exchange element. Further, the heat exchange type ventilator for cold districts melts frost by circulating warm room air inside the heat exchange type ventilator when the heat exchange element is frosted (hereinafter referred to as “defrost”). Called). However, when a heater is used, energy consumption increases, and when defrosted, there is a problem that ventilation cannot be performed during that time.

In response to these problems, by devising the ratio of the supply air volume and the exhaust air volume of the heat exchange type ventilator, the exhaust air path inside the heat exchange element will not be clogged due to frost formation even when the outside air is at a low temperature. Consideration has been made.

As this type of conventional heat exchange type ventilator, when the inside of the heat exchange element is frosted, a device that controls to increase the amount of warm exhaust air and reduce the amount of cool air supply is known (for example, patents). Reference 1).

Hereinafter, the heat exchange type ventilator will be described with reference to FIG.

As shown in FIG. 10, the heat exchange ventilator 101 includes an air supply blower 102, an exhaust blower 103, and a heat exchange element 107. The air supply / air blowing means 102 supplies outdoor air into the room. The exhaust air blowing means 103 exhausts indoor air to the outside. The heat exchange element 107 includes a heat transfer plate 106 that exchanges total heat. The heat transfer plate 106 partitions the supply air passage 104 through which the supply air flow generated by the supply air blowing means 102 flows and the exhaust air passage 105 through which the exhaust flow generated by the exhaust ventilation means 103 flows.

The heat exchange ventilator 101 is provided with a temperature sensor 108 for measuring the temperature of outdoor air. The heat exchange ventilator 101 performs heat exchange according to the measured outdoor air temperature by reducing the cool air supply air volume while maintaining the warm exhaust air volume. Thereby, since the temperature of the whole heat exchange element 107 rises, clogging due to frost formation in the heat exchange element 107 is suppressed.

Japanese Patent Laying-Open No. 2015-135199

In such a conventional heat exchange type ventilator, the exhaust air volume is made larger than the supply air volume, so that the outlet side of the exhaust air path is more negative than the inlet side of the supply air path due to the pressure loss of the air flow flowing inside the heat exchange element. It becomes. Therefore, the heat transfer plate that divides the exhaust air passage and the supply air passage is bent toward the exhaust air passage, and the opening area of the exhaust air passage becomes narrow. Accordingly, there is a problem that clogging due to frost is likely to occur in the exhaust air passage.

Therefore, an object of the present invention is to provide a heat exchange type ventilator that suppresses clogging due to frost formation in the exhaust air passage.

The heat exchange ventilator according to one aspect of the present invention includes an air supply blower, an exhaust blower, a heat exchange element, and a pressure adjuster. The supply air blower supplies outdoor air into the room. The exhaust blower exhausts indoor air to the outside. The heat exchange element has a heat transfer plate. The heat transfer plate divides the supply air passage through which the supply air flow generated by the supply air blowing section flows and the exhaust air passage through which the exhaust flow generated by the exhaust ventilation section flows, and sensible heat is generated between the supply air passage and the exhaust air passage. Or replace the total heat. The pressure adjusting unit is located on the upstream side of the heat exchange element of the supply air passage, and adjusts the pressure of the supply air flow.

The heat exchange ventilator according to one aspect of the present invention can suppress clogging due to frost formation in the exhaust air passage.

Drawing 1 is a schematic diagram showing the example of installation of the heat exchange type ventilator concerning an embodiment. FIG. 2 is a schematic plan view showing the structure of the heat exchange type ventilator according to the embodiment. FIG. 3 is a perspective view showing a total heat exchange element of the heat exchange type ventilator according to the embodiment. FIG. 4 is an exploded perspective view illustrating a part of the total heat exchange element of the heat exchange type ventilator according to the embodiment. FIG. 5 is a conceptual diagram showing an exhaust air passage of a general total heat exchange element. FIG. 6A is a schematic cross-sectional view showing the vicinity of the outlet of the exhaust air passage in the total heat exchange element of the conventional heat exchange ventilator. FIG. 6B is a schematic cross-sectional view showing a state in which frost is generated in the vicinity of the outlet of the exhaust air passage in the total heat exchange element of the conventional heat exchange type ventilator. FIG. 7A is a schematic cross-sectional view showing the vicinity of the outlet of the exhaust air passage in the total heat exchange element of the heat exchange ventilator according to the embodiment. FIG. 7B is a schematic cross-sectional view illustrating a state in which frost is generated in the vicinity of the outlet of the exhaust air passage in the total heat exchange element of the heat exchange type ventilator according to the embodiment. FIG. 8 is a schematic plan view showing another structure of the heat exchange type ventilator according to the embodiment. FIG. 9 is a schematic plan view showing another structure of the heat exchange type ventilator according to the embodiment. FIG. 10 is a schematic plan view showing the structure of a conventional heat exchange type ventilator. FIG. 11 is a schematic diagram illustrating an installation example of a heat exchange type ventilation system according to another embodiment. FIG. 12 is a schematic plan view showing the structure of a total heat exchange type ventilation device of a heat exchange type ventilation system according to another embodiment. FIG. 13 is a perspective view showing a total heat exchange element of a heat exchange type ventilation system according to another embodiment. FIG. 14 is an exploded perspective view showing a part of the total heat exchange element of the heat exchange type ventilation system according to another embodiment. FIG. 15: is a block diagram which shows the structural example of the heat exchange type ventilation system concerning other embodiment. FIG. 16: is a block diagram which shows another structural example of the heat exchange type ventilation system concerning other embodiment. FIG. 17 is a configuration diagram illustrating another configuration example of a heat exchange type ventilation system according to another embodiment.

Thereby, the pressure adjusting unit can adjust the pressure of the air supply air flow so that the pressure on the air supply air passage side becomes low. Therefore, the heat transfer plate is suppressed from being bent toward the exhaust air passage, and the opening area of the exhaust air passage is enlarged. Therefore, clogging due to frost formation in the exhaust air passage is suppressed.

The heat exchange ventilator according to one aspect of the present invention includes a temperature detection unit and a control unit. The temperature detection unit detects the temperature of outdoor air. The control unit causes the pressure adjustment unit to adjust the pressure of the air supply air flow based on the temperature of the outdoor air detected by the temperature detection unit.

As a result, when the temperature detection unit detects the temperature of the outdoor air that is assumed to freeze inside the heat exchange element, the pressure of the supply air flow is reduced so that the pressure on the supply air passage side is lowered by the pressure adjustment unit. Adjusted. Therefore, the heat transfer plate is suppressed from being bent toward the exhaust air passage, and the opening area of the exhaust air passage is enlarged. Therefore, clogging due to frost formation in the exhaust air passage is suppressed according to the temperature of the outdoor air.

Moreover, the heat exchange type ventilator according to one aspect of the present invention includes a differential pressure detection unit and a control unit. The differential pressure detection unit detects a pressure difference between the vicinity of the inlet of the supply air path in the heat exchange element and the vicinity of the outlet of the exhaust air path in the heat exchange element. The control unit causes the pressure adjusting unit to adjust the pressure of the supplied airflow according to the pressure difference detected by the differential pressure detecting unit.

Thereby, according to the pressure difference detected by the differential pressure detection unit, the pressure of the supply air flow is adjusted by the pressure adjustment unit so that the pressure on the supply air path side is lowered. For this reason, in the heat exchange element, the pressure on the inlet side of the supply air passage is kept lower than the pressure on the outlet side of the exhaust air passage. That is, regardless of the magnitude of the pressure loss of each whole air passage caused by clogging of each air passage due to dirt accumulated in each air passage, bending of each air passage, the length of each air passage, etc. The pressure on the inlet side is kept low. Therefore, the heat transfer plate is suppressed from being bent toward the exhaust air passage, and clogging due to frost formation in the exhaust air passage is suppressed.

Further, in the heat exchange type ventilator according to one aspect of the present invention, the pressure adjusting unit is a damper whose opening degree can be adjusted.

Thereby, the pressure of the air supply air in the heat exchange element is adjusted by the opening degree of the damper, which is a simple mechanism. Therefore, the heat exchange type ventilator which suppresses clogging due to frost formation can be provided at a low cost.

Further, in the heat exchange ventilator according to one aspect of the present invention, the supply air blowing unit has a control function of making the air volume constant regardless of the pressure change of the supply air flow.

Thus, the heat exchange type ventilator can realize a ventilation operation with a constant air volume even if the pressure of the supply airflow is adjusted.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment)
In FIG. 1, a heat exchange type ventilation device 2 is installed in a house 1.

The heat exchange ventilator 2 exhausts indoor air (hereinafter referred to as indoor air) to the outside as indicated by black arrows.

Also, the heat exchange ventilator 2 supplies outdoor air (hereinafter referred to as outdoor air) into the room as indicated by white arrows.

In this way, the heat exchange ventilator 2 performs ventilation. The heat exchange ventilator 2 transmits the heat of the indoor air exhausted to the outside to the outdoor air supplied to the room during the ventilation. Thereby, the heat exchange type ventilation apparatus 2 suppresses discharge | emission of unnecessary heat.

As shown in FIG. 2, the heat exchange ventilator 2 includes a main body case 3 provided with an inside air port 6, an exhaust port 7, an outside air port 9, and an air supply port 10. Moreover, the heat exchange type ventilation apparatus 2 includes in the main body case 3 a total heat exchange element 4 that is a heat exchange element, an exhaust fan 5 that is an exhaust air blower, and an air supply fan 8 that is a supply air blower. Prepare. The heat exchange ventilator 2 drives the exhaust fan 5 and sucks room air from the inside air port 6. Then, the heat exchange ventilator 2 exhausts the sucked room air from the exhaust port 7 to the outside through the total heat exchange element 4 and the exhaust fan 5. That is, the exhaust fan 5 exhausts indoor air to the outside. Further, the exhaust flow 14 generated by the exhaust fan 5 flows through the exhaust air passage 20 that connects the inside air port 6 and the exhaust port 7.

Also, the heat exchange ventilator 2 drives the air supply fan 8 to suck outdoor air from the outdoor air port 9. The heat exchange ventilator 2 supplies the sucked outdoor air to the room through the total heat exchange element 4 and the air supply fan 8 from the air supply port 10. That is, the air supply fan 8 supplies outdoor air into the room. In addition, the air supply air 15 generated by the air supply fan 8 circulates through the air supply air passage 21 that connects the outside air inlet 9 and the air inlet 10.

The total heat exchange element 4 includes a plurality of molded products 13 stacked as shown in FIGS. 3 and 4. Each molded product 13 is a member in which the heat transfer plate 12 is attached to the interval holding rib 11. In other words, the plurality of molded products 13 are stacked with an interval held by the interval holding rib 11. The exhaust flow 14 and the supply air flow 15 are alternately circulated for each layer of the interval held by the interval holding rib 11. That is, the heat transfer plate 12 partitions the supply air passage 21 and the exhaust air passage 20. The exhaust flow 14 and the supply air flow 15 flow through the molded product 13 with the heat transfer plate 12 interposed therebetween, whereby heat exchange and moisture exchange are performed via the heat transfer plate 12. As described above, the total heat exchange element 4 includes the heat transfer plate 12. The heat transfer plate 12 exchanges total heat between the supply air passage 21 and the exhaust air passage 20.

Here, a mechanism that causes frost formation in a general heat exchange element will be described in detail with reference to FIG. FIG. 5 is a conceptual diagram showing an exhaust air passage 20 of a general total heat exchange element. In winter, indoor air contains moisture due to heating and human exhalation, and outdoor air is dry. In this case, the exhaust flow 14 and the supply air flow 15 are circulated through the molded product 13 on which the heat transfer plate 12 (see FIG. 4) is mounted, so that the heat and moisture of the exhaust flow 14 are transmitted through the heat transfer plate 12. It is transmitted to the air supply 15. At this time, the temperature of the exhaust stream 14 is lowered by the low temperature air supply 15. Condensation occurs when the relative humidity of the exhaust stream 14 with reduced temperature exceeds 100%. Furthermore, when the temperature of the exhaust stream 14 falls below the freezing point, the condensation freezes and becomes frost.

The region where frost formation is likely to occur is a region as shown by the oblique lines in FIG. More specifically, on the exhaust air flow path 20 side in the region where the outlet side of the exhaust air flow path 20 through which the exhaust air flow 14 circulates and the inlet side of the air supply air flow path 21 through which the air supply air flow 15 circulates via the heat transfer plate 12. Frosting is likely to occur. This is because the exhaust flow 14 in this region is most cooled by first exchanging heat with the low temperature air supply 15.

Further details will be described with reference to FIGS. 6A and 6B. FIG. 6A is a schematic cross-sectional view showing the vicinity of the outlet of the exhaust air passage 20 in the total heat exchange element of the conventional heat exchange ventilator. FIG. 6B is a schematic cross-sectional view showing a state in which frost F is generated in the vicinity of the outlet of the exhaust air passage 20 in the total heat exchange element of the conventional heat exchange ventilator. 6A and 6B are schematic cross-sectional views cut along a plane orthogonal to the direction in which the exhaust flow 14 (see FIG. 4) flows.

As shown in FIG. 6A, when the supply air flow 15 flows through the supply air passage 21 of the total heat exchange element 4, a pressure loss occurs in the supply air passage 21. Thereby, the pressure on the outlet side of the supply air passage 21 becomes lower than the pressure on the inlet side of the supply air passage 21. Similarly, when the exhaust flow 14 flows through the exhaust air passage 20 of the total heat exchange element 4, the pressure on the outlet side of the exhaust air passage 20 becomes lower than the pressure on the inlet side of the exhaust air passage 20. Generally, the pressure on the outlet side of each of the

air passages

20 and 21 is determined by the pressure loss due to the bending of each air passage and the length of each air passage. However, the pressure loss due to the bending of each air passage and the length of each air passage is smaller than the pressure loss due to the air flows 14 and 15 flowing through the

air passages

20 and 21 of the total heat exchange element 4. Therefore, the pressure on the outlet side of each

air passage

20, 21 is affected by the pressure loss due to the

air flow

14, 15 flowing through each

air passage

20, 21 of the total heat exchange element 4. Lower than the pressure on the inlet side. Therefore, the pressure on the outlet side of the exhaust air passage 20 through which the exhaust air flow 14 flows is lower than the pressure on the inlet side of the air supply air passage 21 through which the air supply air flow 15 flows. Therefore, the heat transfer plate 12 bends toward the exhaust air passage 20 and the opening area of the exhaust air passage 20 becomes narrow. As a result, as shown in FIG. 6B, when frost F is generated in the exhaust air passage 20, the exhaust air passage 20 of the total heat exchange element 4 is likely to be clogged.

Therefore, as shown in FIG. 2, the heat exchange ventilator 2 according to the present invention is located upstream of the total heat exchange element 4 of the supply air passage 21 in the main body case 3 (that is, the outside air port 9 side), The damper 16 which is a pressure adjustment part which adjusts the pressure concerning the heat exchanger plate 12 is provided. In other words, the damper 16 adjusts the pressure of the air supply air 15.

By adjusting the opening of the damper 16 to be small, the opening area of the supply air passage 21 through which the supply air flow 15 circulates becomes narrow in the damper 16. Therefore, the pressure loss of the supply air passage 21 in the damper 16 increases. Thus, since the damper 16 reduces the pressure of the supply air flow 15, the pressure near the inlet of the supply air passage 21 in the total heat exchange element 4 decreases.

FIG. 7A is a schematic cross-sectional view showing the vicinity of the outlet of the exhaust air passage 20 in the total heat exchange element 4 of the heat exchange ventilator 2. FIG. 7B is a schematic cross-sectional view showing a state in which frost F is generated in the vicinity of the outlet of the exhaust air passage 20 in the total heat exchange element 4 of the heat exchange ventilator 2. 7A and 7B are schematic cross-sectional views cut along a plane orthogonal to the direction in which the exhaust flow 14 flows.

As shown in FIG. 7A, by reducing the pressure in the vicinity of the inlet of the supply air passage 21 in the total heat exchange element 4, the deflection of the heat transfer plate 12 toward the exhaust air passage 20 is suppressed. As a result, the opening area of the exhaust air passage 20 is expanded. Accordingly, as shown in FIG. 7B, even if frost F is generated in the exhaust air passage 20, the exhaust air passage 20 of the total heat exchange element 4 is not easily clogged.

¡During normal operation, adjust the damper 16 so that it opens fully. On the other hand, when the frost formation of the total heat exchange element 4 is desired to be suppressed, the opening degree of the damper 16 is adjusted to be small.

Further, as shown in FIG. 8, the heat exchange type ventilation device 2 may include a temperature sensor 17 and a control unit 18 as a temperature detection unit. The temperature sensor 17 detects the temperature of outdoor air. Based on the outdoor temperature detected by the temperature sensor 17, the control unit 18 causes the damper 16 to adjust the pressure near the inlet of the supply air passage 21 in the total heat exchange element 4. That is, the control unit 18 causes the damper 16 to adjust the pressure of the air supply air 15 based on the outdoor temperature detected by the temperature sensor 17.

More specifically, the control unit 18 opens the damper 16 only when the temperature of the outdoor air detected by the temperature sensor 17 is equal to or lower than the temperature at which freezing occurs inside the total heat exchange element 4. Adjust to reduce the degree. As a result, as described above, the pressure in the vicinity of the inlet of the supply air passage 21 in the total heat exchange element 4 is reduced, the deflection of the heat transfer plate 12 toward the exhaust air passage 20 is suppressed, and the frost formation of the exhaust air passage 20 occurs. Clogging due to is suppressed. Moreover, the control part 18 adjusts the opening degree of the damper 16 small, only when it is below the temperature assumed that freezing will generate | occur | produce inside the total heat exchange element 4. FIG. For this reason, the number of times the damper 16 is controlled is reduced, and consumption of the damper 16 is suppressed.

Moreover, as shown in FIG. 9, the heat exchange ventilator 2 may include a differential pressure gauge 19 and a control unit 18 as a differential pressure detection unit. The differential pressure gauge 19 detects a pressure difference between the vicinity of the inlet of the supply air passage 21 in the total heat exchange element 4 and the vicinity of the outlet of the exhaust air passage 20 in the total heat exchange element 4. The control unit 18 may adjust the opening degree of the damper 16 according to the pressure difference detected by the differential pressure gauge 19. That is, the control unit 18 may cause the damper 16 to adjust the pressure of the air supply air 15 according to the pressure difference detected by the differential pressure gauge 19.

More specifically, when the differential pressure gauge 19 detects that the pressure near the inlet of the supply air passage 21 in the total heat exchange element 4 is higher than the pressure near the outlet of the exhaust air path 20 in the total heat exchange element 4, The part 18 adjusts the opening degree of the damper 16 to be small. As a result, as described above, the pressure in the vicinity of the inlet of the supply air passage 21 in the total heat exchange element 4 is reduced, the deflection of the heat transfer plate 12 toward the exhaust air passage 20 is suppressed, and frost formation occurs in the exhaust air passage 20. Clogging due to is suppressed. Therefore, the air supply air passages in the total heat exchange element 4 are independent of the clogging of the air passages due to dirt accumulated in the

air passages

20 and 21, the bending of each air passage, the magnitude of pressure loss due to the length of each air passage, and the like. The pressure near the inlet 21 is kept lower than the pressure near the outlet of the exhaust air passage 20 in the total heat exchange element 4. That is, the opening area of the exhaust air passage 20 of the total heat exchange element 4 is expanded, and clogging due to frost formation in the exhaust air passage 20 is suppressed.

Here, the inlet of the supply air path 21 in the total heat exchange element 4 is the inlet of the supply air path 21 in the total heat exchange element 4 on the outside air port 9 side. The outlet of the exhaust air passage 20 in the total heat exchange element 4 is an outlet on the exhaust port 7 side of the exhaust air passage 20 in the total heat exchange element 4.

Furthermore, by using the damper 16 capable of adjusting the opening degree as the pressure adjusting unit, it is possible to provide an inexpensive heat exchange ventilator 2 that suppresses clogging due to frost formation.

Further, the air supply fan 8 may be provided with a control function for keeping the air volume constant irrespective of the pressure change of the air supply air 15. Thereby, the heat exchange type ventilator 2 can realize a ventilation operation with a constant air volume regardless of the pressure of the air supply air 15 adjusted by the damper 16.

In addition, as the air supply fan 8, a fan provided with a DC motor can be cited. A fan equipped with a DC motor can realize a control function for keeping the air volume constant and can easily suppress power consumption.

In the present embodiment, the total heat exchange element 4 is an orthogonal heat exchange element, but it may be a hexagonal heat exchange element (not shown) that combines an opposing type and an orthogonal type. . Even in the case of a hexagonal heat exchange element, frost formation is most likely to occur in a region where the outlet side of the exhaust air passage 20 and the inlet side of the air supply air passage 21 are in contact via the heat transfer plate 12. Therefore, by reducing the pressure in the vicinity of the inlet of the supply air passage 21 in the heat exchange element, the opening area of the exhaust air passage 20 is expanded, and clogging due to frost formation in the exhaust air passage 20 is suppressed.

In this embodiment, the total heat exchange element 4 that performs heat exchange and moisture exchange is illustrated as the heat exchange element, but a sensible heat exchange element that performs only heat exchange may be used. That is, the heat transfer plate 12 may exchange only sensible heat between the supply air passage 21 and the exhaust air passage 20.

(Other embodiments)
Since the opening area of the exhaust air passage is enlarged by the configuration of the above-described embodiment, clogging due to frost formation in the exhaust air passage is suppressed. On the other hand, in cold regions and in winter, outdoor air is dryer than indoor air. Therefore, by increasing the supply amount of dry outdoor air, clogging due to condensation and freezing in the exhaust air passage can be suppressed.

A heat exchange type ventilation system according to another embodiment includes a heat exchange type ventilation device, a supply air flow rate adjustment device, a temperature detection unit, and a supply air flow rate control unit. The heat exchange ventilator has an outdoor air inlet for sucking in outdoor air, an air inlet for supplying air into the room, an air inlet for sucking in indoor air, an air outlet for exhausting outside the air, and an air outlet. An air supply passage that communicates with the air supply port, an exhaust air passage that communicates between the internal air port and the exhaust port, and a heat exchange element that performs heat exchange between the air supply passage and the exhaust air passage. The supply air volume adjusting device is provided in the supply air path and adjusts the supply air volume. The temperature detection unit detects an outdoor temperature. The supply air volume control unit controls the supply air volume adjustment device based on the outdoor temperature detected by the temperature detection unit.

The heat exchange ventilation system according to another embodiment can suppress clogging due to condensation and freezing in the exhaust air passage.

Thus, when the temperature detection unit detects a temperature at which freezing is expected to occur inside the total heat exchange element, the supply air amount control unit operates the supply air amount adjustment device. Then, the air volume of the dry supply airflow which distribute | circulates a supply air path increases. For this reason, the movement of moisture from the exhaust air passage to the air supply air passage is promoted, and the occurrence of condensation in the exhaust air passage is suppressed. That is, clogging due to condensation and freezing in the exhaust air passage is suppressed.

Further, in the heat exchange type ventilation system according to another embodiment, the temperature detection unit and the supply air volume control unit are provided inside the supply air volume control device. The supply air amount adjusting device is provided between the outside air port and the heat exchange element.

This makes it possible to install the temperature detection unit with simple construction without having to extend the signal line for a long time.

Further, in the heat exchange type ventilation system according to another embodiment, the temperature detection unit is provided between the outside air port and the heat exchange element. The air supply amount adjusting device and the air supply amount control unit are provided between the heat exchange element and the air supply port. The temperature detection unit communicates with the supply air volume control unit.

Thus, dirt contained in the outdoor air is purified by the heat transfer plate of the heat exchange element, so that the supply air flow rate adjusting device provided downstream from the heat exchange element is not easily dirty. For this reason, the number of maintenance of the supply air volume adjusting device can be reduced.

In the heat exchange type ventilation system according to another embodiment, the temperature detection unit is provided at a position adjacent to the heat exchange element.

Thereby, the temperature detection unit can detect the outdoor temperature at a position adjacent to the total heat exchange element. Therefore, the temperature detection unit can accurately detect the temperature at which freezing occurs inside the total heat exchange element.

Hereinafter, other embodiments of the present invention will be described with reference to the drawings.

FIG. 11 is a schematic diagram showing a two-story house 201 in which the heat exchange ventilation system 200 is installed. As shown in FIG. 11, the house 201 is composed of a non-residential space where only exhaust is performed and a residential space where both air supply and exhaust are performed. Non-residential spaces include, for example, toilets, washrooms, bathrooms, and the like. The living space includes, for example, a bedroom and a living room. The heat exchange type ventilation system 200 includes a total heat exchange type ventilator 202 that is a heat exchange type ventilator, and an air supply auxiliary fan 203 that is a supply air volume adjusting device. The heat exchange ventilation system 200 is installed behind the ceiling of the house 201. In order to supply and exhaust air in each room, total heat exchange type ventilation device 202 and auxiliary air supply fan 203 are connected to each room by a duct.

FIG. 12 is a schematic plan view showing the configuration of the total heat exchange type ventilation device 202 of the heat exchange type ventilation system 200. As shown in FIG. 12, the total heat exchange type ventilation device 202 includes an air supply fan 204, an exhaust fan 205, and a total heat exchange element 206. The air supply fan 204 sucks outdoor air and supplies it to the room. The exhaust fan 205 sucks indoor air and discharges it outside the room. Total heat exchange element 206 performs heat exchange and moisture exchange between supply air flow 207 blown by supply air fan 204 and exhaust flow 208 blown by exhaust fan 205. Further, the total heat exchanging ventilator 202 exhausts the outdoor air inlet 216 for sucking in outdoor air, the air inlet 217 for supplying air into the room, the air inlet 218 for sucking in indoor air, and the outdoor air. An exhaust port 219, a supply air passage 220, and an exhaust air passage 221 are provided. The air supply passage 220 communicates the outside air inlet 216 and the air inlet 217. The air supply air 207 flows through the air supply air passage 220. The exhaust air passage 221 communicates the inside air port 218 and the exhaust port 219. The exhaust flow 208 flows through the exhaust air passage 221.

The total heat exchange element 206 will be described below with reference to FIGS. 13 and 14.

FIG. 13 is a perspective view showing the total heat exchange element 206 of the total heat exchange type ventilator 202. FIG. 14 is an exploded perspective view of a part of the total heat exchange element 206. As shown in FIGS. 13 and 14, the total heat exchange element 206 includes a plurality of molded products 224 that are stacked. Each molded product 224 is a member in which the heat transfer plate 223 is attached to the interval holding rib 222. In other words, the plurality of molded products 224 are stacked with an interval held by the interval holding rib 222. The air supply air 207 and the exhaust air flow 208 alternately flow for each layer of the interval held by the interval holding rib 222. The heat supply air flow 207 and the exhaust air flow 208 flow with the molded product 224 fitted with the heat transfer plate 223 interposed therebetween, whereby heat exchange and moisture exchange are performed via the heat transfer plate 223. That is, the total heat exchange element 206 performs heat exchange between the supply air passage 220 and the exhaust air passage 221.

Here, the mechanism of freezing in the total heat exchange element 206 will be described. In winter, the total heat exchange element 206 uses the heat of the exhaust stream 208 to warm the supply air stream 207. Therefore, conversely, the exhaust flow 208 is cooled by the supply air flow 207. When the exhaust stream 208 is cooled to below freezing, the moisture in the exhaust stream 208 is saturated. Then, the moisture that could not be held condenses and adheres to the total heat exchange element 206. Furthermore, the condensed moisture is frozen because it is cooled to below freezing point. The frozen moisture will block the exhaust air passage 221 through which the exhaust flow 208 of the total heat exchange element 206 flows.

On the other hand, the blockage of the exhaust air passage 221 can be suppressed by increasing the air volume of the air supply air flow 207 flowing through the air supply air passage 220. Details will be described below.

Moisture movement from the exhaust stream 208 to the supply airflow 207 occurs when the absolute humidity of the exhaust stream 208 is higher than the absolute humidity of the supply airflow 207. Absolute humidity is indicated by the weight of water contained in 1 kg of dry air. Here, by increasing the air volume of the air supply air 207, moisture movement from the exhaust air flow 208 having a high absolute humidity to the air supply air 207 having a low absolute humidity is promoted. As a result, the amount of moisture in the exhaust stream 208 is reduced, so that saturation of moisture in the exhaust stream 208 is suppressed, and dew condensation inside the total heat exchange element 206 is suppressed.

FIG. 15 is a configuration diagram showing a configuration example of the heat exchange type ventilation system 200. As shown in FIG. 15, the heat exchange type ventilation system 200 includes a total heat exchange type ventilation device 202, an air supply auxiliary fan 203 as an air supply air amount adjusting device, a connection duct 209, and a temperature sensor as a temperature detection unit. 210 and an outside air connection duct 213.

The air supply auxiliary fan 203 is provided in the air supply air passage 220, and includes a sirocco fan 211 and a control board 212 which is an air supply air volume control unit. More specifically, the air supply auxiliary fan 203 and the control board 212 are provided between the air supply port 217 and the total heat exchange element 206. The connection duct 209 is provided between the total heat exchange element 206 and the air supply auxiliary fan 203. The outside air connection duct 213 is provided between the total heat exchange element 206 and the outside air port 216. The temperature sensor 210 is provided inside the outside air connection duct 213 and detects the outdoor temperature. That is, the temperature sensor 210 is provided between the outside air port 216 and the total heat exchange element 206. The temperature sensor 210 is electrically connected to the control board 212 through a signal line 214 that is an outside air temperature communication member, and communicates with the control board 212. The control board 212 controls the operation of the sirocco fan 211 based on the outdoor temperature detected by the temperature sensor 210. That is, the control board 212 controls the air supply auxiliary fan 203 based on the outdoor temperature detected by the temperature sensor 210.

As the temperature sensor 210, known temperature detecting means can be used. As the temperature sensor 210, for example, a thermocouple using an electromotive voltage generated at a junction of different metals, a resistance temperature detector, a heat measurement method using a semiconductor, or the like can be used.

In this configuration, a temperature at which freezing occurs inside the total heat exchange element 206 is set in advance as a temperature Td. When the outdoor temperature Tx detected by the temperature sensor 210 is equal to or lower than the temperature Td, the control board 212 sends a signal for operating the sirocco fan 211. On the other hand, when the temperature Tx is higher than the temperature Td, the control board 212 sends a signal for stopping the sirocco fan 211. Thereby, when the temperature sensor 210 detects the temperature Td at which freezing is expected to occur inside the total heat exchange element 206, the control board 212 controls the operation of the sirocco fan 211. Therefore, the air volume of the supply airflow 207 flowing through the supply air passage 220 is increased, and condensation and freezing inside the total heat exchange element 206 are suppressed.

FIG. 16 is a configuration diagram showing another configuration example of the heat exchange type ventilation system 200. As shown in FIG. 16, in this configuration example, the temperature sensor 210 and the control board 212 are provided inside the air supply auxiliary fan 203. The air supply auxiliary fan 203 is provided between the outside air connection duct 213 and the total heat exchange element 206. That is, the air supply auxiliary fan 203 is provided between the outside air port 9 and the total heat exchange element 206. With this configuration, the temperature sensor 210 can be installed with simple construction without causing the signal line 214 to be long.

FIG. 17 is a configuration diagram showing another configuration example of the heat exchange type ventilation system 200. This configuration example is different from the configuration example shown in FIG. 15 in the position where the temperature sensor 210 is provided. In this configuration example, the temperature sensor 210 is provided at a position adjacent to the total heat exchange element 206. With this configuration, the temperature sensor 210 can detect the outdoor temperature in the vicinity of the total heat exchange element 206, and thus can accurately detect the temperature at which freezing occurs in the total heat exchange element 206.

In addition, in this Embodiment, although the heat exchange type ventilation system 200 is installed in the back of the ceiling of the house 201, you may install in the eaves of a house 201, a machine room, etc.

It should be noted that other known types of fans may be used as the sirocco fan 211. A fan that replaces the sirocco fan 211 may be selected according to the assumed air volume and the required static pressure.

The temperature sensor 210 communicates with the control board 212 by wired connection using the signal line 214, but may communicate by wireless connection. When the temperature sensor 210 communicates by wireless connection, the degree of freedom in construction of the temperature sensor 210 and the control board 212 is more preferable.

In FIG. 17, the temperature sensor 210 is installed on the upstream side of the sirocco fan 211, but may be installed on the downstream side of the sirocco fan 211. Even if the temperature sensor 210 is installed downstream of the sirocco fan 211, the temperature sensor 210 can detect the outdoor temperature. However, it is more preferable that the temperature sensor 210 is installed on the upstream side of the sirocco fan 211 because the influence of heat generated by the sirocco fan 211 on the temperature sensor 210 is small.

The heat exchange type ventilation system according to the present invention is useful as a ventilation system because the freezing of the total heat exchange element can be suppressed.

The heat exchange type ventilator according to the present invention is useful as a heat exchange type ventilator equipped with a heat exchange element because clogging due to frost formation can be effectively suppressed.

1 House 2 Heat Exchange Ventilator 3 Body Case 4 Total Heat Exchange Element (Heat Exchange Element)
5 Exhaust fan (exhaust air blower)
6 Inside air port 7 Exhaust port 8 Air supply fan (supply air blower)
9 Outside Air Port 10 Air Supply Port 11 Interval Holding Rib 12 Heat Transfer Plate 13 Molded Product 14 Exhaust Flow 15 Air Supply Air 16 Damper (Pressure Adjustment Unit)
17 Temperature sensor (temperature detector)
18 Control unit 19 Differential pressure gauge (Differential pressure detection unit)
DESCRIPTION OF SYMBOLS 20 Exhaust air path 21 Supply air path 101 Heat exchange type ventilation apparatus 102 Supply air ventilation means 103 Exhaust air blow means 103 Exhaust air path 105 Exhaust air path 106 Heat transfer plate 107 Heat exchange element 108 Temperature sensor 200 Heat exchange type ventilation system 201 House 202 Total Heat Exchange Ventilator 203 Air Supply Auxiliary Fan (Air Supply Air Volume Control Device)
204 Air supply fan 205 Exhaust fan 206 Total heat exchange element (heat exchange element)
207 Supply air 208 Exhaust flow 209 Connection duct 210 Temperature sensor (temperature detection unit)
211 Sirocco fan 212 Control board (supply air volume control unit)
213 Outside air connection duct 214 Signal line 216 Outside air port 217 Air supply port 218 Inside air port 219 Exhaust port 220 Supply air channel 221 Exhaust air channel 222 Spacing rib 223 Heat transfer plate 224 Molded product

Claims

A supply air blowing section for supplying outdoor air into the room;
An exhaust blower for exhausting indoor air to the outside;
A supply air passage through which a supply air flow generated by the supply air blowing section flows and an exhaust air passage through which an exhaust flow generated by the exhaust ventilation section flows, and sensible heat or between the supply air passage and the exhaust air passage A heat exchange element having a heat transfer plate for exchanging total heat;
A heat exchange type ventilation apparatus comprising: a pressure adjusting unit that is located upstream of the heat exchange element in the supply air passage and adjusts the pressure of the supply airflow.
A temperature detector for detecting the temperature of the outdoor air;
The heat exchange type ventilator according to claim 1, further comprising: a control unit that adjusts the pressure of the air supply air flow based on the temperature of outdoor air detected by the temperature detection unit.
A differential pressure detection unit that detects a pressure difference between the vicinity of the inlet of the supply air path in the heat exchange element and the vicinity of the outlet of the exhaust air path in the heat exchange element;
The heat exchange type ventilation apparatus according to claim 1, further comprising: a control unit that causes the pressure adjusting unit to adjust the pressure of the supply airflow according to a pressure difference detected by the differential pressure detecting unit.
The heat exchange ventilator according to claim 1, wherein the pressure adjusting unit is a damper whose opening degree can be adjusted.
The heat exchange ventilator according to claim 1, wherein the air supply and ventilation section has a control function of making the air volume constant regardless of a pressure change of the air supply airflow.