Ventilation system, building, and ventilation method

Abstract

To provide a ventilation system that can prevent internal dew condensation in a building.SOLUTION: A ventilation system 1 includes: an air supply fan 21 for supplying outer air Ao to the inside of a building 2; an exhaust fan 22 for exhausting air Ar in the inside of the building 2 to the outside 16 of the building; and a control device 23 that operates the air supply fan 21 and the exhaust fan 22 simultaneously. The control device 23 includes at least a first operation mode and a second operation mode. In the first operation mode and the second operation mode, exhaust ratios, each of which is a ratio of an amount of exhaust of the exhaust fan 22 to an amount of air supply by the air supply fan 21, are less than 1.0 per unit time and different from each other.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a ventilation system, a building, and a ventilation method.

Background Art

[0002] Patent Document 1 below describes the structure of a building equipped with a first type of ventilation facility. This first type of ventilation facility has an air supply fan that supplies outdoor air into the building and an exhaust fan that discharges the air inside the building to the outside.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, in order to reduce the air conditioning load, buildings have been made more airtight and better insulated. In such buildings, although the airtightness is enhanced, there are unintentional gaps. For this reason, for example, during the cooling operation, if the inside of the building becomes negative pressure, outside air containing a large amount of water vapor flows in from the gaps, and when the outside air is cooled, problems such as condensation occurring on the surface of air conditioning ducts and water supply pipes installed inside the building body such as wall body condensation and between floors and inside walls occur.

[0005] The present invention has been devised in view of the above actual situation, and the main object is to provide a ventilation system capable of preventing internal condensation in a building.

Means for Solving the Problems

[0006] The present invention is a ventilation system, comprising an air supply fan for supplying outside air to the interior of a building, an exhaust fan for exhausting the air inside the building to the outside, and a control device for operating the air supply fan and the exhaust fan simultaneously. The control device includes at least a first operation mode and a second operation mode. In the first operation mode and the second operation mode, the exhaust ratio, which is the exhaust volume of the exhaust fan with respect to the air supply volume of the air supply fan per unit time, is less than 1.0, and they are different from each other. It is a ventilation system.

Advantages of the Invention

[0007] By adopting the above configuration, the building ventilation system of the present invention can prevent internal condensation of the building.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be understood that the drawings include exaggerated expressions and expressions different from the actual structural dimensional ratios in order to assist in understanding the content of the invention. Also, throughout each embodiment, the same or common elements are denoted by the same reference numerals, and overlapping descriptions are omitted. Furthermore, the specific configurations shown in the embodiments and the drawings are for understanding the content of the present invention, and the present invention is not limited to the specific configurations shown.

[0010] [Building] FIG. 1 is a conceptual diagram showing an example of a building 2 in which a ventilation system 1 is installed. The building 2 of the present embodiment is exemplified as a housing 2A, but may be a building or the like. Further, the building 2 of the present embodiment is exemplified as a single-story building, but may be a two-story building or more.

[0011] The building 2 (housing 2A) of the present embodiment is configured as an industrialized housing having excellent airtightness performance and heat insulation performance. Thereby, it is possible to reduce the air conditioning load of the air conditioner 18. In order to effectively reduce such an air conditioning load, the C value, which is the equivalent gap area, is preferably 5 cm 2 / m 2 or less, and more preferably 2 cm 2 / m 2 or less. The C value can be calculated by dividing the total gap (cm 2 ) of the entire housing 2A by the floor area (m 2 ) of the housing 2A in accordance with JIS-A2201 "Test method for airtightness performance of houses etc. by air blowers". Further, the building 2 is not limited to such an industrialized housing.

[0012] The building 2 of the present embodiment is configured to include a space under the floor 3 and a space above the floor 4.

[0013] [Space under the floor] The space under the floor 3 of the present embodiment is a space surrounded by a foundation, the ground, and the first-floor floor 5. An opening 6 for taking in outside air Ao is provided in the foundation. The outside air Ao taken in from the opening 6 is heat-exchanged with the geothermal heat with little temperature change throughout the year through the ground. As a result, the space under the floor 3 can store cooler air in summer and warmer air (hereinafter sometimes simply referred to as "under-floor air") Au than the outside air Ao.

[0014] [Space above the floor] The space above the floor 4 is a space provided above the space under the floor 3 (floor 5). The space above the floor 4 of the present embodiment is partitioned by a floor 5, an outer wall 7, a ceiling 8, and a partition wall 9.

[0015] The outer wall 7 of this embodiment is configured to include an outer wall panel 7P. FIG. 2 is a cross-sectional view showing an example of the outer wall panel 7P. The outer wall panel 7P of this embodiment is configured to include an exterior material 11, a heat insulating material 12, and an interior material 13, similar to the prior art. A ventilation layer 14 is formed between the exterior material 11 and the heat insulating material 12.

[0016] The outer wall panel 7P of this embodiment includes a moisture-proof layer 15 disposed on the inner side (room 17) of the building 2. Such a moisture-proof layer 15 can block the water vapor V1 (indicated by a two-dot chain line) flowing from the inside of the building 2 toward the outdoor 16 side, and can suppress the occurrence of condensation inside the outer wall 7 (outer wall panel 7P). In order to effectively suppress the occurrence of such condensation, the moisture-proof layer 15 is preferably disposed between the heat insulating material 12 and the interior material 13. Further, examples of the moisture-proof layer 15 include a polyethylene sheet and the like.

[0017] As shown in FIG. 1, a plurality of rooms 17 are provided in the floor space 4 of this embodiment. The plurality of rooms 17 of this embodiment include a first room 17a and a second room 17b, but are not limited to such a mode. For example, some of these rooms may be omitted, or other rooms may be included. Further, the first room 17a and the second room 17b are configured as living rooms (for example, living rooms, children's rooms, and bedrooms, etc.), but may also be non-living rooms (for example, washrooms, etc.).

[0018] In this embodiment, an air conditioner 18 is installed inside the building 2 (floor space 4). The air conditioner 18 is configured as, for example, a general household separate type air conditioner, and includes a set of an indoor unit 18a and an outdoor unit (not shown) installed outside the building 2.

[0019] The air conditioner 18 is capable of operating in a heating and cooling operation mode (a cooling operation mode or a heating operation mode). With such an air conditioner 18, the comfort of the floor space 4 is improved. The air conditioner 18 of the present embodiment is provided in the first room 17a, but is not necessarily limited to such a mode. For example, it may be provided in the second room 17b, or may be provided in both the first room 17a and the second room 17b.

[0020] Incidentally, the building 2 may have an unintentional gap (not shown). Such a gap may also be included in an industrialized house with enhanced airtightness as in the present embodiment. In this case, for example, when the inside of the building 2 becomes negative pressure during the cooling operation by the air conditioner 18, outside air containing a large amount of water vapor flows in from the gap, and when the outside air is cooled, condensation is likely to occur inside the building 2, for example, inside the outer wall 7 (outer wall panel 7P).

[0021] Also, the water vapor contained in the air has the property of flowing from a place with a high absolute humidity to a place with a low absolute humidity. For this reason, when the inside of the building 2 is dehumidified during the cooling operation by the air conditioner 18, the absolute humidity inside the building 2 becomes lower than the absolute humidity outside the house 16. In this case, the water vapor V2 (shown by a two-dot chain line in FIG. 2) contained in the outside air flows into the inside of the building 2 (outer wall panel 7P), and condensation is likely to occur inside the building 2 (outer wall panel 7P) and the like.

[0022] On the other hand, during the heating operation by the air conditioner 18, when the inside of the building 2 is humidified, the absolute humidity inside the building 2 becomes higher than that of the outdoors 16. In this case, the water vapor V1 (indicated by the two-dot chain line in Fig. 2) contained inside the building 2 flows out to the outdoors 16 (outer wall panel 7P) side. Such outflow of the water vapor V1 can be blocked to some extent by the moisture-proof layer 15 of the outer wall panel 7P. However, when the pressure inside the building 2 is higher than that of the outdoors 16, the inflow of the water vapor V1 to the inside (outer wall panel 7P) of the building 2 cannot be sufficiently blocked, and condensation is likely to occur inside the building 2 (outer wall panel 7P), etc. Further, due to the inflow and outflow of the water vapor, not only condensation inside the wall but also condensation on the surfaces of air-conditioning ducts and water pipes installed inside the building body such as between floors and inside the wall is likely to occur.

[0023] [Ventilation system] The ventilation system 1 (ventilation method) of the present embodiment is capable of preventing internal condensation in the building 2 while ventilating the inside of the building 2 (in this example, the first room 17a and the second room 17b) shown in Fig. 1.

[0024] The ventilation system 1 of the present embodiment includes an air supply fan 21, an exhaust fan 22, and a control device 23. Further, the ventilation system 1 of the present embodiment includes an indoor temperature sensor 24 and an outdoor temperature sensor 25.

[0025] [Air supply fan] The air supply fan 21 is for supplying outside air Ao to the inside of the building 2. In this specification, a "fan" is a machine for pumping air. Therefore, the fan is not particularly limited as long as it can pump air.

[0026] In the present embodiment, the air supply fan 21 is constituted by only one, but is not limited to such a mode. For example, according to the volume etc. of the inside of the building 2 to be ventilated (for example, the first room 17a and the second room 17b), a plurality of air supply fans (not shown) may be included.

[0027] The supply air fan 21 of this embodiment is capable of supplying air (underfloor air Au) obtained by heat-exchanging outside air Ao with geothermal heat. As described above, since the temperature of geothermal heat hardly changes throughout the year, the outside air Ao (underfloor air Au) heat-exchanged with geothermal heat is cool in summer and warm in winter. By supplying such outside air Ao (underfloor air Au) to the inside of the building 2, while reducing the air-conditioning load of the air conditioner 18, the comfort inside the building 2 is improved.

[0028] The supply air fan 21 of this embodiment is capable of supplying outside air Ao (underfloor air Au) to the inside of the building 2 via the air flow path 26. The air flow path 26 of this embodiment communicates between the underfloor space 3 and the above-floor space 4 (in this example, the first room 17a). Due to such an air flow path 26, the underfloor air Au (outside air Ao) can be supplied to the inside (above-floor space 4) of the building 2. The air flow path 26 of this embodiment is configured as a duct, but is not necessarily limited to such a mode, and may be formed, for example, by the internal space of a partition wall.

[0029] The supply air fan 21 of this embodiment is provided in the underfloor space 3, but is not necessarily limited to such a mode, and may be provided, for example, in the above-floor space 4.

[0030] The supply air fan 21 of this embodiment is operable based on any one of a plurality of predetermined notches. Thereby, the supply air volume (hereinafter sometimes referred to as "supply air volume") of the outside air Ao per unit time by the supply air fan 21 can be flexibly adjusted. The switching of the notches is performed by the control device 23. Note that the supply air fan 21 is not necessarily limited to such a mode, and may be operable, for example, based on one air volume (single notch).

[0031] The supply air fan 21 of this embodiment is configured as a constant air volume fan whose rotation speed is controlled so as to obtain a constant air volume. In this case, by controlling the rotation speed of the supply air fan 21 by the control device 23, the notch (air volume) can be switched.

[0032] The plurality of notches in this embodiment include a first notch and a second notch with an air volume per unit time (hereinafter sometimes referred to as "air volume") smaller than that of the first notch. Note that the plurality of notches are not limited to such a mode, and for example, other notches may be included.

[0033] The air volume of each notch can be appropriately set according to the volume of the interior of the building 2 to be ventilated (for example, the first room 17a and the second room 17b). The air volume of the first notch is set based on, for example, the required ventilation rate (0.5 times / h) for the building 2. On the other hand, the air volume of the second notch is set in consideration of natural ventilation in winter. An example of the air volume of the first notch and the second notch is as follows. Note that the air volume of each notch is not limited to such a mode. Air volume of the first notch: 195m 3 / h Air volume of the second notch: 156m 3 / h

[0034] When the underfloor air Au is supplied by the supply fan 21 as in this embodiment, the underfloor air Au may contain not only the outside air Ao but also the air inside the building 2 (return air). This is because the air inside the building 2 (return air) enters the underfloor space 3 through the gap between the underfloor space 3 and the above-floor space 4. In this case, in order to more accurately obtain the supply amount of the outside air Ao (effective ventilation amount), it is preferable that the value obtained by multiplying the air volume of each notch by the effective ventilation rate is obtained as the supply amount of the supply fan 21. This effective ventilation rate can be appropriately obtained based on, for example, Appendix 3 "Method for Measuring Effective Ventilation Amount" of JIS B8628 "Total Heat Exchanger". Note that when the supply fan 21 can supply only the outside air Ao, the air volume of each notch can be directly obtained as the supply amount (effective ventilation amount) of the supply fan 21 without multiplying by the effective ventilation rate.

[0035] In this embodiment, the effective ventilation rate is, for example, 91%. In this case, the supply amount (effective ventilation amount) of the supply fan 21 during operation at the first notch is the air volume of the first notch (195m 3 / h) is obtained by multiplying the effective ventilation rate (91%). Similarly, the air supply volume (effective ventilation volume) of the air supply fan 21 during operation at the second notch is the air volume at the first notch (156 m 3 / h) is obtained by multiplying the effective ventilation rate (91%). When there are a plurality of air supply fans (not shown), the total value of the air supply volumes of all the air supply fans 21 is specified as the air supply volume of the air supply fan 21. An example of the air supply volume for each notch is as follows. Note that the air supply volume for each notch is not limited to such a mode. Air supply volume at the first notch: 177 m 3 / h Air supply volume at the second notch: 142 m 3 / h

[0036] [Exhaust fan] The exhaust fan 22 is for exhausting the air inside the building 2 to the outdoors 16. In the present embodiment, a plurality of exhaust fans 22 are provided inside the building 2, but only one exhaust fan 22 may be provided.

[0037] The exhaust fan 22 of the present embodiment includes a first exhaust fan 22a and a second exhaust fan 22b, but is not limited to such a mode. For example, depending on the volume of the interior of the building 2 to be ventilated (e.g., the first room 17a and the second room 17b), other exhaust fans (not shown) may be further included.

[0038] The first exhaust fan 22a of the present embodiment is for exhausting the air Ar inside the first room 17a to the outdoors 16. The first exhaust fan 22a of the present embodiment is installed in a hole (not shown) provided in the outer wall panel 7P partitioning the first room 17a, but is not necessarily limited to such a mode. The first exhaust fan 22a may be configured such that the air Ar inside the first room 17a can be exhausted through an air flow path (not shown) communicating the ceiling 8 and the outdoors 16, for example.

[0039] The second exhaust fan 22b of this embodiment is for exhausting the air Ar inside the second chamber 17b to the outdoors 16. The second exhaust fan 22b of this embodiment is installed in a hole portion (not shown) provided in the outer wall panel 7P that partitions the second chamber 17b, but it is not necessarily limited to such a mode. The second exhaust fan 22b may be configured such that the air Ar inside the second chamber 17b can be exhausted through, for example, an air flow path (not shown) that communicates the ceiling 8 and the outdoors 16.

[0040] Each of the exhaust fans 22 (the first exhaust fan 22a and the second exhaust fan 22b) of this embodiment can be operated based on a single air volume (single notch). The air volume of each exhaust fan 22 (single notch) is set, for example, as follows based on, for example, the required ventilation rate (0.5 times / h) for the building 2 and the total number of exhaust fans 22. Note that the air volume of the exhaust fan 22 is not limited to such a mode. Air volume of the first exhaust fan: 60m 3 / h Air volume of the second exhaust fan: 60m 3 / h

[0041] When a plurality of exhaust fans 22 (the first exhaust fan 22a and the second exhaust fan 22b) are in operation, the total value of the air volumes of those exhaust fans 22 (in this example, 120m 3 / h) is specified as the exhaust volume of the exhaust fan 22. On the other hand, when only one of the plurality of exhaust fans 22 is in operation, the air volume of the operating exhaust fan 22 (for example, 60m 3 / h) is specified as the exhaust volume of the exhaust fan 22.

[0042] [Indoor temperature sensor] The indoor temperature sensor 24 is for measuring the temperature inside the building 2 (hereinafter sometimes referred to as the "internal temperature"). The indoor temperature sensor 24 is not particularly limited as long as it can detect the internal temperature, and for example, a known temperature sensor or the like can be adopted.

[0043] The indoor temperature sensor 24 of this embodiment is installed in the first chamber 17a, but it is not necessarily limited to such a mode. For example, it may be installed in the second chamber 17b, or may be installed in both the first chamber 17a and the second chamber 17b. The internal temperature (data) detected by the indoor temperature sensor 24 is transmitted to the control device 23.

[0044] [Outdoor temperature sensor] The outdoor temperature sensor 25 is for measuring the temperature of the outdoors 16 (hereinafter sometimes referred to as the "outdoor temperature"). The outdoor temperature sensor 25 is not particularly limited as long as it can detect the outdoor temperature. For example, a known temperature sensor or the like can be adopted.

[0045] The outdoor temperature sensor 25 of this embodiment is provided in the opening 6 of the foundation, but it is not particularly limited. For example, it may be provided in the outdoor unit (not shown) of the air conditioner 18 or the like. The outdoor temperature (data) detected by the outdoor temperature sensor 25 is transmitted to the control device 23.

[0046] [Control device] The control device 23 of this embodiment is for simultaneously operating the supply air fan 21 and the exhaust fan 22. When these supply air fan 21 and exhaust fan 22 are simultaneously operated, the ventilation system 1 is configured as the first type of ventilation in which supply air and exhaust air are mechanically performed. Thereby, the ventilation system 1 can stably perform supply and exhaust air and can efficiently ventilate.

[0047] The control device 23 of this embodiment is constituted by a computer 27. The control device 23 is installed, for example, on a partition wall or the like, but is not limited to such a mode. FIG. 3 is a conceptual diagram showing an example of the configuration of the control device 23.

[0048] The control device 23 of the present embodiment includes an arithmetic unit 31, a storage device 32 in which processing procedures are stored, and a working memory 33 for reading the processing procedures and the like stored in the storage device 32. An input device 34 and an output device 35 are connected to the control device 23 (arithmetic unit 31).

[0049] [Input device] The input device 34 is configured by operation buttons, a touch panel, etc. provided on the housing of the control device 23 shown in FIG. 1. Information (data) input by, for example, a user (resident) or the like can be transmitted to the control device 23 by such an input device 34. The information input to this input device 34 includes, for example, the start and stop of the ventilation method executed in the ventilation system 1.

[0050] [Output device] The output device 35 is configured as a display provided on the housing of the control device 23 shown in FIG. 1. Information (data) from the control device 23 shown in FIG. 3 can be received by such an output device 35, and for example, the operating status of the ventilation system 1 can be displayed.

[0051] [Arithmetic unit] As shown in FIG. 3, the arithmetic unit 31 of the present embodiment is configured by, for example, a CPU (Central Processing Unit).

[0052] An air supply fan 21 is communicably connected to the arithmetic unit 31 (control device 23) of the present embodiment. Thereby, the operation of the air supply fan 21 (for example, start and stop of operation, switching of notches, etc.) can be controlled by the arithmetic unit 31. Furthermore, data of the air supply fan 21 (for example, the current notch and rotation speed during operation, etc.) can be received by the arithmetic unit 31.

[0053] An exhaust fan 22 (for example, a first exhaust fan 22a and a second exhaust fan 22b) is communicably connected to the arithmetic unit 31 (control device 23) of the present embodiment. Thereby, the operation of each exhaust fan 22 (for example, operation start and operation stop) can be controlled by the arithmetic unit 31. Further, data of each exhaust fan 22 (for example, the number of revolutions during current operation) can be received by the arithmetic unit 31.

[0054] An air conditioner 18 is communicably connected to the arithmetic unit 31 (control device 23) of the present embodiment. Thereby, the operation of the air conditioner 18 (for example, change of set temperature) can be controlled by the arithmetic unit 31. Further, data regarding the operation status of the air conditioner 18 (such as heating / cooling operation mode) can be received by the arithmetic unit 31.

[0055] An indoor temperature sensor 24 is communicably connected to the arithmetic unit 31 (control device 23) of the present embodiment. Thereby, data of the indoor temperature sensor 24 (measurement data of the internal temperature) can be received by the arithmetic unit 31.

[0056] An outdoor temperature sensor 25 is communicably connected to the arithmetic unit 31 (control device 23) of the present embodiment. Thereby, data of the outdoor temperature sensor 25 (measurement data of the outdoor temperature) can be received by the arithmetic unit 31.

[0057] [Storage device] The storage device 32 of the present embodiment is, for example, a non-volatile information storage device. The storage device 32 includes a data section 36 and a program section 37.

[0058] [Data section] The data section 36 is for storing calculation results and the like by the arithmetic unit 31 (control device 23). The data section 36 of the present embodiment includes an input section 36a. Note that the data section 36 is not necessarily limited to such a mode. For example, the data section 36 may further include an input section for storing other information. Details of the data stored in these data sections 36 will be described later.

[0059] [Program section] The program section 37 is a program (computer program) for causing the arithmetic unit 31 (control device 23) to execute the ventilation method of the present embodiment. By being executed by the arithmetic unit 31, the program section (program) 37 can cause the control device 23 to function as a specific means.

[0060] The program section 37 of the present embodiment includes a determination unit 37a, a mode switching unit 37b, a first operation unit 37c, a second operation unit 37d, an end determination unit 37f, and an end unit 37g. The program section 37 is not necessarily limited to such a mode, and some of these programs may be omitted, or other programs may be further included. The functions of these program sections 37 will be described in each step of the ventilation method described later.

[0061] [Ventilation method (first embodiment)] In the ventilation system 1 of the present embodiment, the interior of the building 2 shown in FIG. 1 (in this example, the first room 17a and the second room 17b) is ventilated based on a predetermined processing procedure of the ventilation method. FIG. 4 is a flowchart showing an example of the processing procedure of the ventilation method.

[0062] [Operation of supply fan and exhaust fan simultaneously (control step)] In the ventilation method of the present embodiment, first, the control device 23 shown in FIG. 1 operates the supply fan 21 and the exhaust fan 22 simultaneously (control step S1). FIG. 5 is a flowchart showing an example of the processing procedure of the control step S1.

[0063] In the control step S1 of the present embodiment, at least a first operation mode S13 and a second operation mode S14 are executed by the control device 23 shown in FIG. 3. In the present embodiment, prior to the execution of the first operation mode S13 and the second operation mode S14, a determination step S11 for determining whether it is winter or a period other than winter is performed.

[0064] [Determine whether it is winter or a period other than winter (determination step)] In the control step S1 of the present embodiment, first, the control device 23 determines whether it is winter or a period other than winter (determination step S11).

[0065] In the determination step S11 of the present embodiment, the determination unit 37a included in the program unit 37 shown in FIG. 3 is read into the working memory 33. The determination unit 37a is a program for determining whether the current time is winter or a period other than winter. By executing this determination unit 37a by the arithmetic unit 31, the control device 23 can function as a means for determining whether the current time is winter or a period other than winter.

[0066] Whether the current time is winter or a period other than winter is appropriately determined. In the present embodiment, based on at least one of the current date, the temperature outside 16, the temperature difference between the inside of the building 2 and the outside 16 shown in FIG. 1, and the heating / cooling operation mode of the air conditioner 18, it is determined whether the current time is winter or a period other than winter.

[0067] The determination based on the current date is appropriately performed. For example, if the current date is included in a predetermined date range as winter (for example, December 1st to February 28th), it is determined that the current time is winter. On the other hand, if the current date is included outside the predetermined date range as winter, it is determined that the current time is a period other than winter.

[0068] Judgment based on the outdoor temperature is carried out as appropriate. For example, when the average value of the daily maximum temperature over a certain period (for example, one week) is 15°C or less, it is determined that the current time is winter. On the other hand, when the average value of the daily maximum temperature over a certain period is greater than 15°C, it is determined that the current time is a period other than winter. Further, judgment based on the temperature difference between the inside of the building 2 and the outside 16 is carried out as appropriate. For example, when the temperature difference obtained by subtracting the outdoor 16 temperature from the temperature inside the building 2 is 10°C or more, it is determined that the current time is winter. On the other hand, when the temperature difference is less than 10°C, it is determined that the current time is a period other than winter. Note that the temperature inside the building 2 is measured by the indoor temperature sensor 24 and transmitted to the control device 23. Also, the temperature of the outside 16 is measured by the outdoor temperature sensor 25 and transmitted to the control device 23.

[0069] Judgment based on the heating and cooling operation mode of the air conditioner 18 is carried out as appropriate. For example, when the air conditioner 18 is operating in the heating operation mode, it is determined that the current time is winter. On the other hand, when the air conditioner 18 is operating in a mode other than the heating operation mode or when the operation is stopped, it is determined that the current time is a period other than winter.

[0070] In the determination step S11 of the present embodiment, based on the current date, it is determined whether the current time is winter or a period other than winter. Note that the determination step S11 is not limited to such a mode. For example, it may be determined based on the temperature of the outside 16, or it may be determined based on the temperature difference between the inside of the building 2 and the outside 16, or it may be determined based on the heating and cooling operation mode of the air conditioner 18, or it may be determined by combining these.

[0071] The determination result in the determination step S11 is stored in the input unit 36a shown in FIG. 3.

[0072] [Switch between the first operation mode and the second operation mode (mode switching step)] Next, in the control step S1 of the present embodiment, the control device 23 switches between the first operation mode and the second operation mode based on predetermined conditions (mode switching step S12).

[0073] In this embodiment, the first operation mode S13 and the second operation mode S14 are switched based on the determination result as to whether the current time is during winter or a period other than winter.

[0074] In the mode switching step S12 of this embodiment, first, the determination result in the determination step S11 stored in the input unit 36a shown in FIG. 3 and the mode switching unit 37b included in the program unit 37 are read into the working memory 33. The mode switching unit 37b is a program for switching the first operation mode S13 and the second operation mode S14 based on predetermined conditions. By executing this mode switching unit 37b by the arithmetic unit 31, the control device 23 can function as means for switching the first operation mode S13 and the second operation mode S14.

[0075] In the mode switching step S12, when it is determined that the current time is a period other than winter ("other than winter"), the first operation mode S13 is switched (executed). On the other hand, in the mode switching step S12, when it is determined that the current time is winter ("winter"), the second operation mode S14 is switched (executed).

[0076] [First Operation Mode] Next, in the control step S1 of this embodiment, the control device 23 executes the first operation mode S13. The first operation mode S13 is executed when it is determined that the current time is a period other than winter.

[0077] In the first operation mode S13 of this embodiment, first, the first operation unit 37c included in the program unit 37 shown in FIG. 3 is read into the working memory 33. The first operation unit 37c is a program for executing the first operation mode S13. By executing this first operation unit 37c by the arithmetic unit 31, the control device 23 can function as means for executing the first operation mode S13.

[0078] In the first operation mode S13 of the present embodiment, the operations of the air supply fan 21 and the exhaust fan 22 are controlled based on a predetermined exhaust ratio. The exhaust ratio is the exhaust volume of the exhaust fan 22 with respect to the air supply volume (effective ventilation volume) of the air supply fan 21 per unit time. That is, the exhaust ratio is obtained by dividing the exhaust volume of the exhaust fan 22 by the air supply volume (effective ventilation volume) of the air supply fan 21. And the exhaust ratio in the first operation mode S13 is limited to less than 1.0.

[0079] In the first operation mode S13 of the present embodiment, first, the first operation unit 37c (control device 23) operates the air supply fan 21 based on the first notch (in this example, 195 m 3 / h). Further, in the first operation mode S13 of the present embodiment, the first operation unit 37c (control device 23) operates the exhaust fan 22 (the first exhaust fan 22a and the second exhaust fan 22b). Thereby, in the first operation mode S13, since the air supply fan 21 and the exhaust fan 22 are operated simultaneously, air supply and exhaust are mechanically performed. Therefore, in the first operation mode S13, the ventilation system 1 can be configured as the first type of ventilation, and thus it is possible to efficiently ventilate the interior of the building 2.

[0080] In the present embodiment, the value obtained by multiplying the air volume of the first notch by the effective ventilation volume ratio (in this example, 177 m 3 / h) is specified as the air supply volume (effective ventilation volume) of the air supply fan 21 in the first operation mode. Also, in the present embodiment, the total value of the air volumes of the first exhaust fan 22a and the second exhaust fan 22b (in this example, 120 m 3 / h) is specified as the exhaust volume of the exhaust fan 22 in the first operation mode S13. And the exhaust ratio in the first operation mode S13, that is, the first exhaust ratio (in this example, 0.68), is specified by dividing the exhaust volume of the exhaust fan 22 by the air supply volume (effective ventilation volume) of the air supply fan 21.

[0081] Thus, in the first operation mode S13, by setting the first exhaust ratio to less than 1.0, the intake air volume (effective ventilation volume) of the intake air fan 21 becomes larger than the exhaust air volume of the exhaust air fan 22 shown in FIG. 1, so that the inside of the building 2 is maintained at a positive pressure. As a result, in the first operation mode S13, the inflow of outside air containing a large amount of water vapor into the inside of the building 2 through an unintentional gap (not shown) of the building 2 is suppressed. Therefore, in the ventilation method (ventilation system 1) and the building 2 of the present embodiment, condensation can be prevented from occurring inside the building 2 (inside the outer wall 7, etc.). Further, in the first operation mode S13, the inflow of outside air containing high-temperature outside air, dust, etc. into the inside of the building 2 from an unintentional gap of the building 2 is suppressed. Therefore, in the ventilation method (ventilation system 1) and the building 2 of the present embodiment, an increase in the air conditioning load and a deterioration in comfort can be prevented.

[0082] Further, even if the absolute humidity inside the building 2 becomes lower than that outside the building 16 due to the cooling operation of the air conditioner 18, the inside of the building 2 is maintained at a positive pressure, so that the water vapor V2 contained in the outside air shown in FIG. 2 is suppressed from flowing into the inside of the building 2 (the outer wall panel 7P). As a result, in the first operation mode S13, condensation can be prevented from occurring inside the building 2 (inside the outer wall 7, etc.).

[0083] Furthermore, in the present embodiment, as shown in FIG. 1, cool air (underfloor air Au) obtained by heat-exchanging the outside air Ao with geothermal heat is supplied into the building 2. Therefore, in the ventilation method (ventilation system 1) and the building 2 of the present embodiment, an increase in the air conditioning load of the air conditioner 18 accompanying an increase in the intake air volume can be suppressed.

[0084] The first exhaust ratio is preferably 0.50 to 0.80. By setting the first exhaust ratio to 0.80 or less, the interior of building 2 is maintained at a positive pressure, so that condensation can be prevented from occurring inside building 2 (such as inside outer wall 7). On the other hand, by setting the first exhaust ratio to 0.50 or more, it is possible to prevent the supply air volume of outside air Ao from becoming excessively large, suppress an increase in the air conditioning load of air conditioner 18, and effectively ventilate. From such a perspective, the first exhaust ratio is more preferably 0.70 or less, and more preferably 0.60 or more.

[0085] [Second operation mode] Next, in control step S1 of the present embodiment, as shown in FIG. 5, control device 23 executes second operation mode S14. Second operation mode S14 is executed when it is determined that the current time is winter.

[0086] In second operation mode S14 of the present embodiment, first, second operation unit 37d included in program unit 37 shown in FIG. 3 is read into work memory 33. Second operation unit 37d is a program for executing second operation mode S14. By this second operation unit 37d being executed by arithmetic device 31, control device 23 can be made to function as means for executing second operation mode S14.

[0087] In second operation mode S14 of the present embodiment, the operations of supply air fan 21 and exhaust fan 22 are controlled based on a predetermined exhaust ratio. The exhaust ratio of second operation mode S14 is limited to less than 1.0 and is different from the exhaust ratio (first exhaust ratio) of first operation mode S13.

[0088] In second operation mode S14 of the present embodiment, first, second operation unit 37d (control device 23) is at the second notch (in this example, 156 m 3Based on (h), the intake fan 21 is operated. Further, in the second operation mode S14 of the present embodiment, the second operation unit 37d (control device 23) operates the exhaust fan 22 (the first exhaust fan 22a and the second exhaust fan 22b). Thereby, in the second operation mode S14, since the intake fan 21 and the exhaust fan 22 are operated simultaneously, intake and exhaust are mechanically performed. Therefore, in the second operation mode S14, the ventilation system 1 can be configured as the first type of ventilation, so that the inside of the building 2 can be efficiently ventilated.

[0089] In the present embodiment, the value obtained by multiplying the air volume of the second notch by the effective ventilation rate (in this example, 142 m 3 / h) is specified as the intake air volume (effective ventilation volume) of the intake fan 21 in the second operation mode. In the present embodiment, the total value of the air volumes of the first exhaust fan 22a and the second exhaust fan 22b respectively (in this example, 120 m 3 / h) is specified as the exhaust volume of the exhaust fan 22 in the second operation mode S14. Then, by dividing the exhaust volume of the exhaust fan 22 by the intake air volume (effective ventilation volume) of the intake fan 21, the second exhaust ratio (in this example, 0.85), which is the exhaust ratio in the second operation mode S14, is specified.

[0090] In this way, in the second operation mode S14, by setting the second exhaust ratio to less than 1.0, the intake air volume (effective ventilation volume) of the intake fan 21 becomes larger than the exhaust volume of the exhaust fan 22 shown in FIG. 1, so that the inside of the building 2 is maintained at a positive pressure. Thereby, in the second operation mode S14, the intrusion of outside air containing low-temperature outside air, dust, etc. into the inside of the building 2 through an unintended gap (not shown) of the building 2 is suppressed. Therefore, in the ventilation method (ventilation system 1) and the building 2 of the present embodiment, an increase in air conditioning load and a deterioration in comfort can be prevented.

[0091] In this embodiment, the air supply fan 21 and the exhaust fan 22 are operated at a second exhaust ratio (0.85 in this example) that is larger than the first exhaust ratio (0.68 in this example). As a result, in the second operation mode S14, the difference between the air supply amount and the exhaust amount is set to be relatively small compared to the first operation mode S13, so that it is possible to suppress the pressure inside the building 2 from becoming excessively high with respect to the outside 16. For this reason, even if the absolute humidity inside the building 2 becomes higher than the absolute humidity outside 16 due to the heating operation of the air conditioner 18, it is possible to suppress the excessive outflow of the water vapor V1 to the outside 16 (outer wall panel 7P) shown in FIG. 2. Thus, in the ventilation method (ventilation system 1) and the building 2 of this embodiment, it is possible to prevent condensation from occurring inside the building 2 (inside the outer wall 7, etc.). Further, the moisture-proof layer 15 included in the outer wall panel 7P sufficiently blocks the outflow of the water vapor V1. Therefore, in the ventilation method (ventilation system 1) and the building 2 of this embodiment, it is possible to more reliably prevent condensation from occurring inside the building 2 (inside the outer wall 7, etc.).

[0092] Further, in this embodiment, since the warm air (underfloor air Au) obtained by heat-exchanging the outside air Ao with the ground heat is supplied into the building 2, it is possible to suppress an increase in the air-conditioning load accompanying an increase in the air supply amount.

[0093] The second exhaust ratio is preferably set to 1.1 to 1.5 times the first exhaust ratio. By setting the second exhaust ratio to 1.1 times or more the first exhaust ratio, the exhaust amount becomes larger than that in the first operation mode S13, and the difference between the air supply amount and the exhaust amount is set to be relatively small, so that it is possible to prevent condensation from occurring inside the building 2 (inside the outer wall 7, etc.). On the other hand, by setting the second exhaust ratio to 1.5 times or less the first exhaust ratio, it is possible to suppress the exhaust amount from becoming excessively large and prevent an increase in the air-conditioning load and a deterioration in comfort. From such a viewpoint, the second exhaust ratio is preferably 1.2 times or more and preferably 1.4 times or less the first exhaust ratio.

[0094] [Determine whether there is an instruction to end ventilation] Next, in the ventilation method of the present embodiment, as shown in FIG. 4, the control device 23 determines whether there is an instruction to end the ventilation (step S2). The determination in step S2 is performed, for example, at time intervals of 1 to 60 minutes.

[0095] In step S2 of the present embodiment, an end determination unit 37f included in the program unit 37 shown in FIG. 3 is read into the working memory 33. The end determination unit 37f is a program for determining whether there is an instruction to end the ventilation. By executing this end determination unit 37f by the arithmetic unit 31, the control device 23 can function as a means for determining whether there is an instruction to end the ventilation.

[0096] The determination of whether there is an instruction to end the ventilation is made, for example, based on instruction data input by a user (resident) or the like to the input device 34 (shown in FIGS. 1 and 3), or the occurrence of an abnormal end such as an interrupt process.

[0097] In the present embodiment, when it is determined that there is an instruction to end the ventilation (Yes in step S2), step S3 for ending the ventilation is performed. On the other hand, when it is determined that there is no instruction to end the ventilation (No in step S2), control step S1 and step S2 are performed again.

[0098] The ventilation method (ventilation system 1) and the building 2 of the present embodiment switch between the first operation mode S13 and the second operation mode S14 shown in FIG. 5 according to the change in time including the winter season and other seasons until there is an instruction to end the ventilation. Since these first operation mode S13 and second operation mode S14 have different exhaust ratios (first exhaust ratio and second exhaust ratio), for example, the exhaust ratio can be changed according to the relationship between the absolute humidity inside the building 2 shown in FIG. 1 and the outdoors 16. Therefore, internal condensation of the building 2 (outer wall 7) can be effectively prevented.

[0099] Furthermore, in the ventilation method (ventilation system 1) and the building 2 of the present embodiment, by maintaining the exhaust ratio (the first exhaust ratio and the second exhaust ratio) below 1.0, the intrusion of high-temperature or low-temperature outside air into the building 2 from an unintended gap (not shown) of the building 2 is suppressed. Furthermore, the intrusion of outside air containing dust or the like into the building 2 is suppressed. Thereby, an increase in the air-conditioning load and a deterioration in comfort can be prevented.

[0100] [End ventilation] Next, in the ventilation method of the present embodiment, when the determination in step S2 is affirmative, the control device 23 ends the ventilation (step S3).

[0101] In step S3 of the present embodiment, first, the end part 37g included in the program part 37 shown in FIG. 3 is read into the work memory 33. This end part 37g is a program for ending the ventilation of the building 2 by the ventilation system 1. By executing this end part 37g by the arithmetic unit 31, the control device 23 can function as a means for ending the ventilation.

[0102] In step S3 of the present embodiment, the end part 37g (control device 23) ends the operation of the supply fan 21 and the exhaust fan 22. Thereby, the ventilation of the building 2 by the ventilation system 1 ends.

[0103] [Ventilation method (Second embodiment)] In the previous embodiments, the intake fan 21 was operated at the first notch in the first operation mode S13 and at the second notch in the second operation mode S14, whereby the second exhaust ratio was made larger than the first exhaust ratio. However, the present invention is not limited to such an aspect. For example, in the first operation mode S13, at least one of the plurality of exhaust fans 22 is stopped, or the rotation speed is reduced by closing the louver of the grill of the exhaust fan 22 to provide resistance, and in the second operation mode S14, all of the plurality of exhaust fans 22 are normally operated, so that the second exhaust ratio may be relatively increased. In this case, in both the first operation mode S13 and the second operation mode S14, it is preferable that the intake fan 21 is operated at the first notch or the second notch. Thereby, in this embodiment, while setting the first exhaust ratio and the second exhaust ratio to less than 1.0, the first exhaust ratio and the second exhaust ratio can be made different from each other. Furthermore, the second exhaust ratio can be set larger than the first exhaust ratio.

[0104] In this embodiment, as in the previous embodiments, since the first exhaust ratio and the second exhaust ratio are set to less than 1.0, the inside of the building 2 is maintained at a positive pressure, so that internal condensation of the building 2 (outer wall 7) can be prevented. Furthermore, since the intrusion of outside air at high or low temperature or outside air containing dust or the like into the inside of the building 2 from an unintended gap (not shown) of the building 2 is suppressed, an increase in the air-conditioning load and a deterioration in comfort can be prevented.

[0105] Furthermore, in this embodiment, as in the previous embodiments, by operating the intake fan 21 and the exhaust fan 22 at a second exhaust ratio larger than the first exhaust ratio, the outflow of the water vapor V1 to the outer wall panel 7P side shown in FIG. 2 is suppressed from becoming excessive in winter. Furthermore, since the moisture-proof layer 15 included in the outer wall panel 7P sufficiently blocks the outflow of the water vapor V1, condensation inside the building 2 (inside the outer wall 7, etc.) can be prevented from occurring.

[0106] As described above, the particularly preferred embodiments of the present invention have been described in detail. However, the present invention is not limited to the illustrated embodiments and can be implemented in various forms.

[0107] [Supplementary Note] The present invention includes the following aspects.

[0108] [Invention 1] A ventilation system, An air supply fan for supplying outside air to the inside of a building, An exhaust fan for exhausting the air inside the building to the outside, A control device for operating the air supply fan and the exhaust fan simultaneously, The control device includes at least a first operation mode and a second operation mode, In the first operation mode and the second operation mode, the exhaust ratio, which is the exhaust volume of the exhaust fan with respect to the air supply volume of the air supply fan per unit time, is less than 1.0 and different from each other. Ventilation system. [Invention 2] The control device includes a mode switching unit that switches the first operation mode and the second operation mode based on predetermined conditions, the ventilation system according to Invention 1. [Invention 3] In the first operation mode, the air supply fan and the exhaust fan are operated at a first exhaust ratio, In the second operation mode, the air supply fan and the exhaust fan are operated at a second exhaust ratio greater than the first exhaust ratio, The control device further includes a determination unit that determines whether it is winter or a period other than winter, The mode switching unit switches to the first operation mode when it is determined to be a period other than winter, and switches to the second operation mode when it is determined to be winter, the ventilation system according to Invention 2. [Invention 4] The determination unit determines whether the current time is winter or a period other than winter based on at least one of the current date, the outside temperature, the temperature difference between the inside and outside of the building, and the heating and cooling operation mode of the air conditioner installed inside the building, the ventilation system according to Invention 3. [Invention 5] The intake fan supplies air obtained by heat-exchanging the outside air with geothermal heat, and the ventilation system according to any one of Inventions 1 to 4 of the present invention. [Invention 6] The exhaust ratio in the first operation mode is 0.50 to 0.80, The exhaust ratio in the second operation mode is larger than the exhaust ratio in the first operation mode, and the ventilation system according to any one of Inventions 1 to 5 of the present invention. [Invention 7] A building equipped with the ventilation system according to any one of Inventions 1 to 6 of the present invention. [Invention 8] The building is a house in which the C value, which is the equivalent gap area, is 5 cm 2 / m 2 or less, and the building according to Invention 7. [Invention 9] The building further includes an outer wall panel that constitutes an outer wall of the building, and the outer wall panel includes a moisture-proof layer disposed on the inner side of the building, and the building according to Invention 7 or 8. [Invention 10] A ventilation method, including a control step of simultaneously operating an intake fan for supplying outside air to the inside of a building and an exhaust fan for exhausting the air inside the building to the outside, the control step executes at least a first operation mode and a second operation mode, in the first operation mode and the second operation mode, the exhaust ratio, which is the exhaust volume of the exhaust fan with respect to the intake volume of the intake fan per unit time, is less than 1.0 and different from each other, Ventilation method. [Invention 11] The control step includes a mode switching step of switching the first operation mode and the second operation mode based on predetermined conditions, and the ventilation method according to Invention 10. [Invention 12] In the first operation mode, the intake fan and the exhaust fan are operated at a first exhaust ratio, In the second operation mode, the intake fan and the exhaust fan are operated at a second exhaust ratio greater than the first exhaust ratio. The control step further includes a determination step of determining whether it is winter or a period other than winter. The mode switching step switches to the first operation mode when it is determined to be a period other than winter, and switches to the second operation mode when it is determined to be winter. The ventilation method according to Invention 11. [Invention 13] The determination step determines whether the current time is winter or a period other than winter based on at least one of the current date, the outdoor temperature, the temperature difference between the inside and outside of the building, and the heating and cooling operation mode of the air conditioner installed in the building. The ventilation method according to Invention 12. [Invention 14] The intake fan supplies air obtained by heat-exchanging the outside air with geothermal heat. The ventilation method according to any one of Inventons 10 to 13. [Invention 15] The exhaust ratio in the first operation mode is 0.50 to 0.80. The exhaust ratio in the second operation mode is greater than the exhaust ratio in the first operation mode. The ventilation method according to any one of Inventons 10 to 14.

Explanation of Signs

[0109] 1 Ventilation system 2 Building 16 Outside 21 Intake fan 22 Exhaust fan 23 Control device

Claims

1. A ventilation system, comprising: An air supply fan for supplying outside air to the inside of a building; An exhaust fan for exhausting the air inside the building to the outside; A control device for operating the air supply fan and the exhaust fan simultaneously; The control device includes at least a first operation mode and a second operation mode; In the first operation mode and the second operation mode, an exhaust ratio, which is the exhaust volume of the exhaust fan relative to the air supply volume of the air supply fan per unit time, is less than 1.0 and different from each other; Ventilation system.

2. The ventilation system according to claim 1, wherein the control device includes a mode switching unit for switching the first operation mode and the second operation mode based on predetermined conditions.

3. In the first operation mode, the air supply fan and the exhaust fan are operated at a first exhaust ratio; In the second operation mode, the air supply fan and the exhaust fan are operated at a second exhaust ratio greater than the first exhaust ratio; The control device further includes a determination unit for determining whether it is winter or a period other than winter; The ventilation system according to claim 2, wherein the mode switching unit switches to the first operation mode when it is determined to be a period other than winter, and switches to the second operation mode when it is determined to be winter.

4. The determination unit determines whether the current time is winter or a period other than winter based on at least one of the current date, the outside temperature, the temperature difference between the inside and outside of the building, and the heating and cooling operation modes of the air conditioner installed inside the building. The ventilation system according to claim 3.

5. The ventilation system according to claim 1, wherein the air supply fan supplies air obtained by heat-exchanging the outside air with geothermal heat.

6. The exhaust ratio in the first operation mode is 0.50 to 0.80; The ventilation system according to claim 1, wherein the exhaust ratio in the second operation mode is greater than the exhaust ratio in the first operation mode.

7. A building equipped with the ventilation system according to any one of claims 1 to 6.

8. The building is a house in which the C value, which is the equivalent gap area, is 5 cm 2 / m 2 or less, according to the building of claim 7.

9. The building further includes an outer wall panel constituting the outer wall of the building; The building according to claim 7, wherein the outer wall panel includes a moisture-proof layer arranged on the inner side of the building.

10. A ventilation method, comprising: A control step of simultaneously operating an air supply fan for supplying outside air to the inside of a building and an exhaust fan for exhausting the air inside the building to the outside. The control process at least executes a first operation mode and a second operation mode, wherein in the first operation mode and the second operation mode, an exhaust ratio, which is the exhaust volume of the exhaust fan with respect to the air supply volume of the air supply fan per unit time, is less than 1.0 and they are different from each other. Ventilation method.

11. The ventilation method according to claim 10, wherein the control process includes a mode switching process of switching the first operation mode and the second operation mode based on predetermined conditions.

12. In the first operation mode, the air supply fan and the exhaust fan are operated at a first exhaust ratio. In the second operation mode, the air supply fan and the exhaust fan are operated at a second exhaust ratio greater than the first exhaust ratio. The control process further includes a determination process of determining whether it is winter or a period other than winter. The ventilation method according to claim 11, wherein in the mode switching process, when it is determined to be a period other than winter, the process switches to the first operation mode, and when it is determined to be winter, the process switches to the second operation mode.

13. The determination process according to claim 12 determines whether the current time is winter or a period other than winter based on at least one of the current date, the outdoor temperature, the temperature difference between the inside and the outside of the building, and the heating and cooling operation mode of the air conditioner installed in the building.

14. The ventilation method according to claim 10, wherein the air supply fan supplies air obtained by heat-exchanging the outside air with geothermal heat.

15. The exhaust ratio in the first operation mode is 0.50 to 0.

80. The ventilation method according to any one of claims 10 to 14, wherein the exhaust ratio in the second operation mode is greater than the exhaust ratio in the first operation mode.

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