Ventilation system

Abstract

To provide a ventilation system which can preferably inhibit occurrence of dew condensation after renovation work is conducted for heat insulation.SOLUTION: A ventilation system has: an LDK 19 including at least a habitable room; and a non-habitable room 20 at least partially located adjacent to the LDK 19 and ventilates a housing H in which renovation work is conducted in the LDK 19 for heat insulation. The ventilation system includes: a temperature sensor 50 which acquires environment information of the non-habitable room 20; and an underfloor air supply part 40 having an air supply fan 43, which is rotated by a driving force, and configured to supply air in an underfloor space H3 of the housing H to the non-habitable room 20; and a control unit 60 which controls the air supply fan 43 according to an acquisition result of the temperature sensor 50.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the technology of a ventilation system for ventilating a building.

Background Art

[0002] Conventionally, the technology of a ventilation system for ventilating a building is well-known. For example, Patent Document 1 discloses a ventilation system having an outdoor air introduction fan installed on the wall of a building to introduce air in an outdoor space into an indoor space.

[0003] Also conventionally, the technology of heat insulation renovation for a part of a building space is well-known. For example, Patent Document 2 discloses a technology of retrofitting a heat insulating material according to the heat insulation performance of an existing outer wall to improve the heat insulation performance of the building outer wall.

[0004] Here, when heat insulation renovation is performed on a part of the rooms in a building, a temperature difference in air between the room where the heat insulation renovation is performed and another room adjacent to this room is likely to occur as compared with before the renovation, and thus dew condensation may easily occur in the other room.

[0005] Therefore, even when ventilation is performed in the other room using the ventilation system described in Patent Document 1, since the temperature of the air in the outdoor space introduced into the indoor space is relatively low, it is difficult to improve the ease of dew condensation occurrence in the other room.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] This invention has been made in view of the above circumstances, and the problem it aims to solve is to provide a ventilation system that can effectively suppress the occurrence of condensation after thermal insulation renovation. [Means for solving the problem]

[0008] The problems that this invention aims to solve are as described above, and the means for solving these problems will now be explained.

[0009] That is, claim 1 provides a ventilation system for a building having a first indoor space including at least a living room and a second indoor space that is at least partially adjacent to the first indoor space, wherein the first indoor space has undergone thermal insulation improvements, comprising: a sensor unit for acquiring environmental information of the second indoor space; an underfloor air supply unit having a fan that rotates by a driving force for supplying air from the underfloor space of the building to the second indoor space; and a control unit for controlling the fan according to the results acquired by the sensor unit. Furthermore, the first indoor space is provided with a ventilation unit configured to supply air from the outdoor space to the first indoor space and to discharge the air from the first indoor space to the outdoor space, thereby enabling 24-hour ventilation to be completed solely within the first indoor space. It is.

[0010] In claim 2, the results obtained by the sensor unit include the temperature of the air in the second indoor space.

[0011] In claim 3, the results obtained by the sensor unit include the amount of water vapor in the air of the second indoor space.

[0013] Claim 4 In this case, the ventilation unit is a Type 1 ventilation system having a total heat exchanger. [Effects of the Invention]

[0014] The present invention provides the following effects:

[0015] In the present invention, the occurrence of condensation can be effectively suppressed after thermal insulation renovation. [Brief explanation of the drawing]

[0016] [Figure 1] Floor plan showing the ventilation system according to the first embodiment of the present invention and the first floor portion of a house in which the ventilation system is provided. [Figure 2] (a) Similarly, a schematic side view showing the underfloor space and a part of the first floor portion. (b) Block diagram of the ventilation system [Figure 3] Similarly, a flowchart showing the dew condensation suppression process. [Figure 4] Floor plan showing the ventilation system according to the second embodiment of the present invention and the first floor portion of a house in which the ventilation system is provided. [Figure 5] Floor plan showing the first floor portion of a house according to another example in which a ventilation system is provided.​​​​​​​​​​​​​​​​​​​The entrance porch 11 is formed in the southern part of the first floor in the outdoor space. An entrance 12 is formed in the indoor space on the north side of the entrance porch 11. An entrance door 12a is provided at the entrance 12. A Japanese-style room 14 is formed on the west side of the entrance 12. Also, a corridor 13 is formed on the north side of the entrance 12. The corridor 13 is formed in a substantially L-shaped plan view that extends northward from the entrance 12 and extends westward from the north end.

[0021] Also, a staircase 15 leading to the second floor is formed at the north end of the corridor 13. A storage space under the staircase 15a is formed in the lower part of the staircase 15. Also, a toilet 16, a washroom 17, and a bathroom 18 are formed at the west end of the corridor 13. In addition, a living-dining-kitchen (LDK) 19 is formed across the east-west direction on the first floor. In the LDK 19, a living room, a dining room, and a kitchen are provided in order from the south to the north. Thus, in the first floor part of the house H, a Japanese-style room 14 and an LDK 19 are provided as living rooms, and an entrance 12, a corridor 13, a staircase 15, a toilet 16, a washroom 17, a bathroom 18, and a storage space under the staircase 15a are provided as non-living rooms.

[0022] Also, in this embodiment, heat insulation renovation has been carried out on the house H. Heat insulation renovation is a renovation (reform) carried out to improve the heat insulation performance of an existing house. In the house H, heat insulation renovation has been carried out on a part of the space rather than the whole of the house H (that is, partially). In the following, the heat insulation renovation carried out partially as described above may be referred to as "partial heat insulation renovation".

[0023] In this embodiment, partial insulation renovation is carried out in the LDK19 as part of the space of the house H (see the hatched area with dashed lines shown in Figures 1 and 2(a)). Specifically, in the LDK19, the wall section that separates the LDK19 from the adjacent space (specifically, the interior wall section that separates the LDK19 from the entrance 12, corridor 13, and staircase 15, and the exterior wall section that separates the LDK19 from the outdoor space), as well as the floor H2 and ceiling of the LDK19, etc., are demolished, and new insulation materials are installed on the existing structure. In the following, the interior space adjacent to the LDK19 via the interior wall section, namely the entrance 12, corridor 13, and staircase 15, may be referred to as "non-habitable room 20".

[0024] Thus, when partial insulation renovations are carried out, the insulation performance of LDK19 improves compared to other spaces. In other words, heat transfer between LDK19 and non-living room 20 is suppressed, so for example, in winter, when humidification and heating are used, LDK19 tends to become hot and humid, while non-living room 20 tends to become cold. In this way, when partial insulation renovations are carried out, a temperature difference in the air between LDK19 and non-living room 20 (inter-room temperature difference) may occur more easily compared to before the partial insulation renovations.

[0025] Here, in the state described above where a temperature difference occurs between rooms, if water vapor in the air moves from the high-temperature, high-humidity LDK19 to the low-temperature non-living room 20, the air in the non-living room 20 will cool down, making condensation more likely to occur, which is problematic. Therefore, in the house H according to this embodiment, a ventilation system 30 is provided to suppress the occurrence of condensation in the non-living room 20 even after partial insulation renovation.

[0026] In the following, the configuration of the ventilation system 30 according to the first embodiment will be described in detail with reference to Figures 1 and 2. The ventilation system 30 comprises an underfloor air supply unit 40, a temperature sensor 50, and a control unit 60.

[0027] The underfloor air supply unit 40 comprises a floor grille 41, a duct 42, and an air supply fan 43. The floor grille 41 is formed in the floor portion H2 of the first floor of the non-living room 20 (in this embodiment, the floor portion H2 of the under-stair storage 15a). The floor grille 41 is formed to connect the floor portion H2 vertically.

[0028] The duct 42 is formed in the underfloor space H3. The duct 42 is formed in the underfloor space H3 to connect the floor grille 41 and the supply air fan 43, which will be described later. One end (upper side) of the duct 42 in the longitudinal direction is connected to the floor grille 41. The duct 42 guides the air supplied from the supply air fan 43 to the floor grille 41.

[0029] The air supply fan 43 is formed in the underfloor space H3. The air supply fan 43 is configured to be rotatable by a driving force from a predetermined drive source. The air supply fan 43 is connected to the other (lower) end of the duct 42 in the longitudinal direction. The air supply fan 43 generates airflow inside the duct 42 toward the opposite side by rotational drive.

[0030] Thus, in the underfloor air supply unit 40, as shown in Figure 2(a), the air supplied by the air supply fan 43 into the duct 42 is guided by the duct 42 and blown out to the under-stair storage 15a via the floor grille 41. In other words, the underfloor air supply unit 40 can supply air from the underfloor space H3 to the non-living room 20. In the underfloor space H3, when the air supply fan 43 of the underfloor air supply unit 40 is driven to rotate, air from the outdoor space is forcibly drawn in along with the supply of air from the underfloor space H3 to the non-living room 20.

[0031] The temperature sensor 50 is installed in a non-living room 20 (for example, a corridor 13). The temperature sensor 50 is configured to acquire the temperature of the air in the non-living room 20.

[0032] The control unit 80 includes an arithmetic processing unit such as a CPU, a storage unit such as RAM or ROM, etc. The control unit 80 uses various information and programs stored in the storage unit in advance to perform various processes related to the ventilation system 30. Here, the various processes include a process to make it difficult for condensation to occur in the non-living room 20 when there is a temperature difference between the LDK 19 and the non-living room 20 (hereinafter referred to as "condensation suppression process").

[0033] The control unit 80 is electrically connected to the air supply fan 43. The control unit 80 controls the air supply fan 43 and can switch it ON (on) / OFF (off) at any time. The control unit 60 is electrically connected to the temperature sensor 50. The control unit 60 is configured to receive the acquisition (detection) results from the temperature sensor 50. The control unit 80 is also configured to acquire information regarding the current date and time.

[0034] The following describes the condensation suppression process performed by the control unit 60 using the flowchart in Figure 3. The control unit 60 repeatedly performs the condensation suppression process at arbitrary intervals (for example, every 30 minutes).

[0035] In step S11, the control unit 60 determines whether the current time is winter or not based on information regarding the current date and time. The control unit 60 determines that the current time is winter if, for example, the current time is between December and February. If the control unit 60 determines that the current time is winter, it proceeds to the process in step S12. On the other hand, if the control unit 60 determines that the current time is not winter, it terminates the condensation suppression process.

[0036] In step S12, the control unit 60 determines whether the temperature of the air in the non-living room 20 is below a predetermined first threshold. The control unit 60 makes this determination based on the results obtained from the temperature sensor 50. Various values ​​can be used as the first threshold from the viewpoint of suppressing condensation. For example, the first threshold can be a value based on the dew point temperature calculated according to the amount of water vapor in the air of the non-living room 20. If the control unit 60 determines that the temperature of the air in the non-living room 20 is below the first threshold, it proceeds to the process in step S13. On the other hand, if the control unit 60 determines that the temperature of the non-living room 20 is not below the first threshold, it terminates the condensation suppression process.

[0037] In step S13, the control unit 60 turns on the supply fan 43. In this way, the supply fan 43 rotates, and air from the underfloor space H3 is supplied to the non-living room 20 (see Figure 2). After executing the process in step S13, the control unit 60 executes the process in step S14.

[0038] In step S14, the control unit 60 determines whether the temperature of the non-habitable room 20 is below a predetermined second threshold. The control unit 60 makes this determination based on the results obtained from the temperature sensor 50. The second threshold is set to a value higher than the first threshold. Various values ​​based on temperatures at which condensation is unlikely to occur can be used as the second threshold. If the control unit 60 determines that the temperature of the non-habitable room 20 is not below the second threshold, it proceeds to the process in step S15. On the other hand, if the control unit 60 determines that the temperature of the non-habitable room 20 is below the second threshold, it repeats the process in step S14.

[0039] In step S15, the control unit 60 turns off the supply fan 43. As a result, the supply fan 43 stops rotating, and the supply of air from the underfloor space H3 to the non-living room 20 is also stopped. After executing the process in step S15, the control unit 60 temporarily terminates the condensation suppression process.

[0040] In this way, the control unit 60 can rotate the supply air fan 43 when the non-living room 20 becomes prone to condensation during winter, and supply air to the non-living room 20 using the air from the underfloor space H3.

[0041] In winter, the underfloor space H3 tends to stay warmer than the outdoor space due to the influence of the ground. For example, even when the temperature of the air in the outdoor space is below freezing, the temperature of the air in the underfloor space H3 can be maintained at around 10 degrees Celsius. Furthermore, because the underfloor space H3 takes in air from the outdoor space, the amount of water vapor in the air in the underfloor space H3 becomes equivalent to the amount of water vapor in the air in the outdoor space.

[0042] Therefore, when ventilating a non-living room 20 using air from the outdoor space during winter, supplying air from the outdoor space after it has been taken into the underfloor space H3 allows for the supply of higher temperature air than supplying air from the outdoor space directly to the non-living room 20. Furthermore, when ventilating a non-living room 20 using air from the outdoor space, it is possible to supply air with a lower water vapor content than, for example, humidified air in the LDK 19. In this way, by supplying air from the underfloor space H3 via the underfloor air supply unit 40, it is possible to suppress excessive temperature drops and ventilate the non-living room 20 using air with a low water vapor content that is less likely to cause condensation.

[0043] By performing this condensation suppression treatment, the air with a high water vapor content in the non-living room 20 is discharged to the outside, reducing the amount of water vapor in the air of the non-living room 20. Furthermore, since the supply air fan 43 is used to supply air to the non-living room 20, the pressure in the non-living room 20 is kept in a positive state, thereby suppressing the movement of water vapor from the LDK 19 to the non-living room 20.

[0044] Furthermore, when performing the condensation suppression treatment, the supply air fan 43 is rotated as needed from the perspective of suppressing the occurrence of condensation. In other words, since it is not necessary to keep the supply air fan 43 running at all times, energy savings can be achieved.

[0045] In the following, a ventilation system 30 according to the second embodiment of the present invention will be described with reference to Figure 4. The ventilation system 30 according to the second embodiment differs from the ventilation system 30 according to the first embodiment in that a private room ventilation fan 70 is provided on the exterior wall of the LDK 19. In the following, components in the ventilation system 30 according to the second embodiment that are common with the ventilation system 30 according to the first embodiment will be denoted by the same reference numerals, and their descriptions will be omitted as appropriate.

[0046] The individual room ventilation fan 70 is a Type 1 ventilation system mechanical ventilation device. The individual room ventilation fan 70 comprises a casing 71, a total heat exchanger 72, an exhaust fan 73, and a supply fan 74.

[0047] The casing 71 houses the other components of the individual room ventilation fan 70. The casing 71 is provided with a first air passage 71a, which is an air passage from the LDK 19 to the outdoor space, and a second air passage 71b, which is an air passage from the outdoor space to the LDK 19. An exhaust fan 73 is provided in the first air passage 71a. The rotational drive of the exhaust fan 73 causes air to flow from the LDK 19 to the outdoor space. An air supply fan 74 is provided in the second air passage 71b. The rotational drive of the air supply fan 74 causes air to flow from the outdoor space to the LDK 19. The total heat exchanger 72 performs sensible heat and latent heat exchange (total heat exchange) between the two air passages 71a and 71b.

[0048] In this way, the individual room ventilation fan 70 can ventilate the LDK19 while suppressing the decrease in the temperature and humidity of the air in the LDK19 due to the air in the outdoor space. Furthermore, the individual room ventilation fan 70 allows for 24-hour ventilation to be completed solely within the LDK19 where partial insulation renovations have been carried out (i.e., high airtightness), and the pressure inside the LDK19 can be brought close to an equal pressure (zero pressure) state. In this way, the movement of the air in the LDK19 (and consequently, the water vapor in that air) to the non-habitable room 20 can be suppressed. Therefore, condensation can be made less likely to occur in the non-habitable room 20. In addition, the total heat exchanger 72 of the individual room ventilation fan 70 can reduce heat loss in the LDK19.

[0049] As described above, in the ventilation system 30 according to the embodiment of the present invention, A ventilation system for a house H (building) having at least a living room, living room, kitchen, kitchen (LDK) 19 (first indoor space), and a non-living room 20 (second indoor space) that is at least partially adjacent to the LDK 19 (first indoor space), wherein the LDK 19 (first indoor space) has undergone insulation renovation, A temperature sensor 50 (sensor unit) that acquires environmental information of the non-habitable room 20 (second indoor space), An underfloor air supply unit 40 has an air supply fan 43 that rotates due to a driving force, and supplies air from the underfloor space H3 of the house H (building) to the non-living room 20 (second indoor space), A control unit 60 controls the air supply fan 43 according to the results obtained by the temperature sensor 50 (sensor unit), It is equipped with the following features.

[0050] With this configuration, by supplying air from the underfloor space H3 via the underfloor air supply unit 40, excessive temperature drops can be suppressed, and the non-living room 20 can be ventilated using air with a low water vapor content that is less likely to cause condensation. In this way, the occurrence of condensation can be effectively suppressed after partial insulation renovation of the house H.

[0051] Furthermore, in the ventilation system 30, The results obtained by the temperature sensor 50 (sensor unit) include the temperature of the air in the non-living room 20 (second indoor space).

[0052] With this configuration, condensation can be effectively suppressed after partial insulation renovation of the house H, based on the air temperature in the non-habitable room 20 (second indoor space).

[0053] Furthermore, in the ventilation system 30 according to the second embodiment, The LDK19 (first indoor space) is equipped with a private room ventilation fan 70 (ventilation unit) that supplies air from the outdoor space to the LDK19 (first indoor space) and discharges the air from the LDK19 (first indoor space) to the outdoor space.

[0054] With this configuration, 24-hour ventilation can be completed solely within the LDK19 where partial insulation renovation has been carried out, and the pressure within the LDK19 can be brought close to an equal pressure (zero pressure) state. As a result, condensation can be effectively suppressed after partial insulation renovation of house H.

[0055] Furthermore, in the ventilation system 30 according to the second embodiment, The aforementioned private room ventilation fan 70 (ventilation unit) is a Type 1 ventilation system having a total heat exchanger 72.

[0056] This configuration makes it possible to reduce heat loss in the living room, dining room, kitchen (LDK19).

[0057] Furthermore, the house H according to this embodiment is one form of an implementation of the building according to the present invention. Furthermore, the LDK19 according to this embodiment is one form of the first interior space according to the present invention. Furthermore, the non-habitable room 20 according to this embodiment is one form of the second indoor space according to the present invention. Furthermore, the private room ventilation fan 70 according to this embodiment is one form of the ventilation unit according to the present invention.

[0058] Although embodiments of the present invention have been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention as described in the claims.

[0059] For example, the building is not limited to a residence, but may be an apartment building, office building, commercial facility, school, etc. Also, if the building is a residence, it is not limited to a two-story building as in this embodiment, but may be a three-story building, etc.

[0060] Furthermore, in this embodiment, the LDK19 was used as an example to describe the first interior space, but it is not limited to this. That is, the first interior space may be any space that includes at least a living room and has undergone partial insulation renovation (a space separated from a space that has not undergone partial insulation renovation), such as the space shown in Figure 5. Here, in the example shown in Figure 5, partial insulation renovation has been carried out not only in the LDK19 but also in spaces that include circulation routes such as the corridor 13 and water-related areas such as the toilet 16, washroom 17 and bathroom 18 (see the hatched area with dashed lines in Figure 5), and this space can be considered the first interior space.

[0061] Furthermore, in this embodiment, the second interior space was described using a non-habitable room 20 (entrance 12, corridor 13, and staircase 15) as an example, but it is not limited to this. That is, the second interior space may include a habitable room, and for example, as shown in the example in Figure 5, the Japanese-style room 14 adjacent to the space indicated by the hatched area of ​​the dashed line can be designated as the second interior space.

[0062] In this embodiment, the control unit 60 switches the supply fan 43 ON and OFF based on the air temperature as environmental information of the non-living room 20, but it is not limited to this. For example, the control unit 60 can also switch the supply fan 43 ON and OFF based on the amount of water vapor contained in the air as environmental information of the non-living room 20. Alternatively, the control unit 60 can switch the supply fan 43 ON and OFF based on both the air temperature and the amount of water vapor, rather than just one of them, as environmental information of the non-living room 20.

[0063] Thus, in the ventilation system 30, The results obtained by the temperature sensor 50 (sensor unit) include the amount of water vapor in the air of the non-living room 20 (second indoor space).

[0064] With this configuration, the occurrence of condensation can be effectively suppressed after partial insulation renovation of the house H, based on the amount of water vapor in the air of the non-habitable room 20 (second indoor space). [Explanation of Symbols]

[0065] 19 LDK 20 Non-occupied room 30 Ventilation System 40 Underfloor air supply unit 43. Intake fan 50 Temperature Sensors 60 Control Unit

Claims

1. A ventilation system for a building having a first indoor space including at least a living room, and a second indoor space that is at least partially adjacent to the first indoor space, wherein the first indoor space has undergone thermal insulation improvements, A sensor unit that acquires environmental information of the second indoor space, An underfloor air supply unit having a fan that rotates due to a driving force, which supplies air from the underfloor space of the building to the second indoor space, A control unit that controls the fan according to the results obtained by the sensor unit, It is equipped with, The first indoor space is provided with a ventilation unit that supplies air from the outdoor space to the first indoor space and discharges the air from the first indoor space to the outdoor space, thereby enabling 24-hour ventilation to be completed solely within the first indoor space. Ventilation system.

2. The results obtained by the sensor unit include the temperature of the air in the second indoor space. The ventilation system according to claim 1.

3. The results obtained by the sensor unit include the amount of water vapor in the air of the second indoor space. The ventilation system according to claim 1.

4. The ventilation unit is a first-type ventilation device having a total heat exchanger. The ventilation system according to claim 1.

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