Underfloor space condensation prevention system

Abstract

This can suppress the occurrence of condensation in the underfloor space caused by moisture released from the concrete floor and humid outside air entering the underfloor space in early summer. [Solution] This is a condensation prevention system 1 for the underfloor space 3 of a house 2. The underfloor space 3 is equipped with a concrete floor 4. The condensation prevention system 1 includes a first temperature sensor 5 for measuring the outside air temperature, a second temperature sensor 6 for measuring the surface temperature of the floor 4, an underfloor air supply fan 7 for taking in outside air A1 into the underfloor space 3 and ventilating the underfloor space 3, and a control unit 8 for controlling the operation of the underfloor air supply fan 7. The control unit 8 includes a first input unit 10 for acquiring the outside air temperature measured by the first temperature sensor 5, a second input unit 11 for acquiring the surface temperature of the floor 4 measured by the second temperature sensor 6, and a fan operation determination unit 12 for activating the underfloor air supply fan 7 when it is determined that the condition that the outside air temperature is equal to or greater than the surface temperature of the floor 4 is met.

Description

Technical Field

[0001] The present invention relates to a dew condensation prevention system for an underfloor space.

Background Art

[0002] Patent Document 1 below discloses an underfloor ventilation structure of a building. This underfloor ventilation structure includes a guide member that forms a dehumidification passage portion for dehumidifying the passing air. Further, a fan device for drawing outside air into the underfloor space through the dehumidification passage portion is provided in the underfloor space of the building. Such an underfloor ventilation structure is expected to have the effect of dehumidifying and supplying outside air under the floor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when the underfloor space has a dirt floor finished with concrete, especially in the first few years after casting and curing, the moisture inside the concrete is released into the underfloor space (several liters per day). There was a problem that dew condensation occurred in the underfloor space when the high - humidity underfloor air containing the released moisture was cooled by the dirt floor or the floor joist space. In particular, in early summer, there was a problem that dew condensation was likely to occur because the humid outside air entered the underfloor space.

[0005] The present invention has been devised in view of the above actual situation, and the main object is to provide a dew condensation prevention system for an underfloor space that can suppress the occurrence of dew condensation in the underfloor space caused by the moisture released from the concrete of the dirt floor and the entry of the humid outside air in early summer.

Means for Solving the Problems

[0006] The present invention relates to a condensation prevention system for the underfloor space of a house, wherein the underfloor space is equipped with a concrete floor, and the system includes a first temperature sensor for measuring the outside air temperature, a second temperature sensor for measuring the surface temperature of the concrete floor, an underfloor air supply fan for taking in outside air into the underfloor space and ventilating the underfloor space, and a control unit for controlling the operation of the underfloor air supply fan, wherein the control unit includes a first input unit for acquiring the outside air temperature measured by the first temperature sensor, a second input unit for acquiring the surface temperature of the concrete floor measured by the second temperature sensor, and a fan operation determination unit for activating the underfloor air supply fan when it is determined that the condition that the outside air temperature is equal to or greater than the surface temperature of the concrete floor is met, and is a condensation prevention system for the underfloor space. [Effects of the Invention]

[0007] The condensation prevention system for the underfloor space of the present invention, by adopting the above configuration, can suppress the occurrence of condensation in the underfloor space caused by moisture released from the concrete floor and humid outside air in early summer entering the underfloor space. [Brief explanation of the drawing]

[0008] [Figure 1] This is a cross-sectional view of a house equipped with a condensation prevention system for the underfloor space according to one embodiment of the present invention. [Figure 2] This is a conceptual block diagram showing an example of the configuration of the control unit. [Figure 3] This is a flowchart showing an example of the processing procedure of the control unit. [Figure 4] This flowchart shows another example of the processing procedure of the control unit. [Figure 5] This flowchart shows another example of the processing procedure of the control unit. [Figure 6] This is a cross-sectional view of a house equipped with a condensation prevention system for the underfloor space according to another embodiment. [Figure 7] This is a conceptual block diagram showing another example of the control unit configuration. [Figure 8]This flowchart shows another example of the processing procedure of the control unit. [Figure 9] Figures 1 and 6 show cross-sectional views of the underfloor space of the house, cut horizontally. [Modes for carrying out the invention]

[0009] One embodiment of the present invention will be described below with reference to the drawings. The drawings contain exaggerations and representations that differ from the actual structural dimensional ratios in order to aid in understanding the present invention. Furthermore, where there are multiple embodiments, the same or common elements and steps are denoted by the same reference numerals throughout the specification, and redundant descriptions are omitted. Moreover, the specific configurations shown in the embodiments and drawings are for the purpose of understanding the content of the present invention, and the present invention is not limited to the specific configurations shown.

[0010] [Condensation prevention system (First embodiment (First invention))] Figure 1 is a cross-sectional view of a house 2 equipped with a condensation prevention system for the underfloor space (hereinafter sometimes simply referred to as the "condensation prevention system") 1 according to one embodiment of the present invention. As shown in Figure 1, the house 2 of this embodiment includes an underfloor space 3 separated by the first floor 20 and an upper floor space 21. In this embodiment, a single-story house 2 is exemplified, but it may also be a two-story house.

[0011] [Housing] The underfloor space 3 is comprised of a space enclosed by the foundation 22, the floor slab 4, and the floor 20. The floor slab 4 is finished with concrete. In this embodiment, the concrete surface of the floor slab 4 is exposed to the underfloor space 3. The foundation 22 is surrounded by insulation material 23. This makes the underfloor space 3 an insulated compartment. The foundation 22 is provided with an opening 24 for taking in outside air A1. The outside air A1 taken in through the opening 24 exchanges heat with the heat in the ground, which has little temperature change throughout the year, via the floor slab 4. As a result, the underfloor space 3 can store underfloor air that is relatively cool in the summer and relatively warm in the winter compared to the outside air A1.

[0012] The floor space 21 is a space provided above the under-floor space 3. The floor space 21 of the present embodiment includes, for example, a plurality of living rooms 25.

[0013] Next, the dew condensation prevention system 1 of the first invention includes a first temperature sensor 5, a second temperature sensor 6, an under-floor air supply fan 7, and a control unit 8.

[0014] [First Temperature Sensor] The first temperature sensor 5 measures the outside air temperature. The outside air temperature is the temperature of the air outside the house 2. The first temperature sensor 5 is provided, for example, on the outer wall 26 of the house 2. In other embodiments, a temperature sensor provided on an outdoor unit of an air conditioner (not shown) may be used. Thus, the outside air temperature measured by the first temperature sensor 5 is transmitted to the control unit 8 as a corresponding electric signal.

[0015] [Second Temperature Sensor] The second temperature sensor 6 measures the surface temperature of the dirt floor 4. The second temperature sensor 6 is provided, for example, on the concrete surface of the dirt floor 4. Thus, the surface temperature of the dirt floor 4 measured by the second temperature sensor 6 is transmitted to the control unit 8 as a corresponding electric signal. For the first temperature sensor 5 and the second temperature sensor 6 of the present embodiment, known temperature sensors such as thermocouples, resistance thermometers, thermistors, infrared thermometers, etc. can be employed.

[0016] [Under-Floor Air Supply Fan] The underfloor air supply fan 7 takes in the outside air A1 into the underfloor space 3 and ventilates the underfloor space 3. The underfloor air supply fan 7 of the present embodiment is provided in the underfloor space 3. In a more preferable example, the underfloor air supply fan 7 may be provided facing the foundation 22 provided with the opening 24. The underfloor air supply fan 7 can take in the outside air A1 from the opening 24 and take it into the underfloor space 3, for example. The air taken into the underfloor space 3 is mixed with the existing underfloor air, and a part of it can be discharged to the outside of the underfloor space 3 through, for example, the gap between the outer wall 26 and the foundation 22 or the gap of the floor 20. In another example, the air in the underfloor space 3 may be supplied as ventilation air to the above-floor space 21 using another fan (this will be described later). In any case, the underfloor air supply fan 7 can ventilate the underfloor space 3.

[0017] [Control unit] The control unit 8 controls the operation of the underfloor air supply fan 7 according to a predetermined processing procedure. The control unit 8 of the present embodiment is constituted by a computer. The control unit 8 may be installed, for example, on the partition wall of the living room 25 or the like. FIG. 2 is a conceptual block diagram showing an example of the configuration of the control unit 8. As shown in FIG. 2, the control unit 8 includes, for example, an arithmetic unit (CPU) 30, a storage unit 31 for storing processing procedures and the like, and a working memory 32 for reading the processing procedures and the like from the storage unit 31.

[0018] The arithmetic unit 30 of the present embodiment is communicably connected to the first temperature sensor 5. Thereby, the arithmetic unit 30 can receive the electrical signal of the first temperature sensor 5 (in this example, the measurement data of the outside air temperature).

[0019] The arithmetic unit 30 of the present embodiment is communicably connected to the second temperature sensor 6. Thereby, the arithmetic unit 30 can receive the electrical signal of the second temperature sensor 6 (in this example, the measurement data of the surface temperature of the dirt floor 4).

[0020] The arithmetic unit 30 of the present embodiment is communicably connected to the underfloor air supply fan 7. Thereby, the arithmetic unit 30 can control the operation of the underfloor air supply fan 7.

[0021] The storage unit 31 in this embodiment is, for example, a non-volatile information storage device. The storage unit 31 includes a data unit 33 and a program unit 34.

[0022] The data unit 33 in this embodiment is for storing calculation results and the like from the calculation unit 30.

[0023] In this embodiment, the program unit 34 is a computer program that causes the control unit 8 to perform a predetermined process. The program unit 34 is executed by the arithmetic unit 30, thereby enabling the control unit 8 to function as a specific means as described below.

[0024] The control unit 8 (program unit 34) includes a first input unit 10, a second input unit 11, and a fan operation determination unit 12.

[0025] The first input unit 10 acquires the ambient temperature measured by the first temperature sensor 5.

[0026] The second input unit 11 acquires the surface temperature of the floor slab 4 measured by the second temperature sensor 6.

[0027] The fan operation determination unit 12 operates the underfloor air supply fan 7 when it determines that the condition that the outside air temperature is equal to or higher than the surface temperature of the floor slab 4 is met. In this embodiment, the fan operation determination unit 12 stops the underfloor air supply fan 7 when it determines that the above condition is not met.

[0028] Figure 3 is a flowchart showing the processing procedure of the control unit 8 in this embodiment. Figure 3 also shows the procedure for preventing condensation in the underfloor space. As shown in Figure 3, the control unit 8 in this embodiment first measures the outside air temperature (step S1).

[0029] In step S1 of this embodiment, the first input unit 10 of the program unit 34 shown in Figure 2 is loaded into the working memory 32, and the first input unit 10 is executed by the calculation unit 30, thereby enabling the control unit 8 to function as a means for acquiring the ambient temperature. Specifically, the first input unit 10 inputs (stores) the ambient temperature measured by the first temperature sensor 5 into the data unit 33.

[0030] Next, the control unit 8 of this embodiment measures the surface temperature of the earthen floor 4 (step S2). Note that step S1 and step S2 may be executed in any order.

[0031] In step S2 of this embodiment, the second input unit 11 included in the program unit 34 shown in Figure 2 is loaded into the working memory 32, and the second input unit 11 is executed by the calculation unit 30, thereby enabling the control unit 8 to function as a means for acquiring the surface temperature of the floor 4. Specifically, the second input unit 11 inputs (stores) the surface temperature of the floor 4 measured by the second temperature sensor 6 into the data unit 33.

[0032] Next, the control unit 8 of this embodiment determines whether the outside air temperature is equal to or greater than the surface temperature of the earthen floor 4 (step S3).

[0033] In step S3 of this embodiment, the fan operation determination unit 12 included in the program unit 34 shown in Figure 2 is loaded into the working memory 32, and the fan operation determination unit 12 is executed by the calculation unit 30, thereby enabling the control unit 8 to function as a means for determining whether the outside air temperature is equal to or higher than the surface temperature of the floor 4.

[0034] In this embodiment, if the control unit 8 determines that the outside air temperature is above the surface temperature of the floor 4 (Yes in step S3), it activates the underfloor air supply fan 7 (step S4). On the other hand, if the control unit 8 determines that the outside air temperature is not above the surface temperature of the floor 4 (No in step S3), it stops the underfloor air supply fan 7 (step S5). Then, steps S1 to S3 are repeated in sequence.

[0035] As described above, the underfloor space 3 condensation prevention system 1 of this embodiment can forcibly ventilate the underfloor space 3 by operating the underfloor air supply fan 7 when the conditions of step S3 are met. At this time, the underfloor space 3 can be ventilated while taking in outside air A1 at a temperature higher than the surface temperature of the floor slab 4, which promotes the release of moisture from the concrete of the floor slab 4 and helps to dry the concrete quickly. In addition, the highly humid air containing moisture released from the concrete is discharged to the outside of the underfloor space 3 by the underfloor air supply fan 7, for example. Furthermore, if the conditions of step S3 are not met, the control unit 8 can save unnecessary energy by stopping the underfloor air supply fan 7 because the drying effect on the concrete of the floor slab 4 cannot be sufficiently expected. As described above, the underfloor space 3 condensation prevention system 1 of this embodiment can suppress the occurrence of condensation in the underfloor space 3.

[0036] The second to fourth inventions will be described below with reference to Figures 4 to 9.

[0037] [Condensation prevention system (Second embodiment (Second invention))] Figure 4 is a flowchart showing the processing procedure of the control unit 8 of the second invention. As shown in Figure 4, the second invention differs from the first invention in that, when the fan operation determination unit 12 determines that the outside air temperature is equal to or higher than the surface temperature of the floor 4 (Yes in step S3), it determines whether the outside air temperature is equal to or higher than a predetermined first temperature (step S6). In this embodiment, when the fan operation determination unit 12 determines that the outside air temperature is equal to or higher than a predetermined first temperature (Yes in step S6), it operates the underfloor air supply fan 7 (step S4). On the other hand, when the fan operation determination unit 12 determines that the outside air temperature is not equal to or higher than a predetermined first temperature (No in step S6), it stops the underfloor air supply fan 7 (step S5).

[0038] Condensation in the underfloor space 3, caused by moisture released from the concrete floor 4, was a problem that occurred particularly frequently around July. After diligent research, the inventors discovered that operating the underfloor air supply fan 7 during the period from spring to early summer, for example, from around March 15th to June 15th, could more effectively suppress the occurrence of condensation in the underfloor space 3. From this perspective, the predetermined first temperature is set to the outside air temperature at the start of the aforementioned period. Specifically, the predetermined first temperature is preferably 10°C or higher, and more preferably 12°C or higher. Also, the predetermined first temperature is preferably 20°C or lower, and more preferably 18°C ​​or lower. In this embodiment, the predetermined first temperature is set to 15°C. As a result, the condensation prevention system 1 of the second invention can dry the concrete by operating the underfloor air supply fan 7 in the underfloor space 3 before the period when condensation is likely to occur, and save unnecessary energy by stopping the underfloor air supply fan 7 during other periods. Therefore, the condensation prevention system 1 of the second invention can more effectively suppress the occurrence of condensation in the underfloor space 3.

[0039] In this embodiment, the fan operation determination unit 12 makes the determination in step S3 and then makes the determination in step S6, but it is not limited to this configuration. The fan operation determination unit 12 may make the determination in step S3 and then make the determination in step S6.

[0040] [Condensation prevention system for underfloor space (Third embodiment (Third invention))] Figure 5 is a flowchart showing the processing procedure of the control unit 8 of the third invention. As shown in Figure 5, the third invention differs from the second invention in that, when the fan operation determination unit 12 determines that the outside air temperature is above a predetermined first temperature (Yes in step S6), it determines whether the surface temperature of the floor 4 is below a predetermined second temperature (step S7). In this embodiment, when the fan operation determination unit 12 determines that the surface temperature of the floor 4 is below a predetermined second temperature (Yes in step S7), it operates the underfloor air supply fan 7 (step S4). On the other hand, when the fan operation determination unit 12 determines that the surface temperature of the floor 4 is not below a predetermined second temperature (No in step S7), it stops the underfloor air supply fan 7 (step S5).

[0041] In the summer, operating the underfloor air supply fan 7 allows warm outside air A1 to enter the underfloor space 3, which can cause the temperature of the air in the underfloor space 3 to rise unintentionally. Furthermore, if the warm air from the underfloor space 3 is discharged into the upper floor space 21 through gaps in the floor 20, there is a problem that the room temperature in the living room 25 in the upper floor space 21 will rise. As mentioned above, drying the concrete of the floor slab 4 before the period when condensation is likely to occur frequently in the underfloor space 3 reduces the occurrence of condensation in the underfloor space 3 during the summer. Therefore, by stopping the underfloor air supply fan 7 in the summer, it is possible to avoid an unintentional rise in the temperature of the air in the underfloor space 3. From this perspective, the predetermined second temperature is set to the surface temperature of the floor slab 4 at the beginning of summer. Specifically, the predetermined second temperature is preferably 25°C or higher, and more preferably 27°C or higher. In this embodiment, the predetermined second temperature is set to 25°C. As a result, the condensation prevention system 1 of the third invention can prevent the temperature of the air in the underfloor space 3 from rising unnecessarily, thereby improving the comfort of the living room 25.

[0042] In this embodiment, the fan operation determination unit 12 makes decisions in the order of step S3, step S6, and step S7, but it is not limited to this configuration. The fan operation determination unit 12 may make decisions in any order of the above three steps.

[0043] [Condensation prevention system for underfloor space (Fourth embodiment (Fourth invention))] Figure 6 is a cross-sectional view of a house 2 equipped with the condensation prevention system 1a of the fourth invention. Based on Figure 6, the configuration of the condensation prevention system 1a of the fourth invention will be explained.

[0044] The condensation prevention system 1a of the fourth invention includes a humidity sensor 9.

[0045] [Humidity sensor] The humidity sensor 9 measures the relative humidity of the outside air. The relative humidity of the outside air is the relative humidity of the air outside the house 2. The humidity sensor 9 is installed, for example, on the exterior wall 26 of the house 2. As a result, the relative humidity of the outside air measured by the humidity sensor 9 is transmitted to the control unit 8a as a corresponding electrical signal.

[0046] [Control unit of the fourth invention] Figure 7 is a conceptual block diagram showing an example of the configuration of the control unit 8a of the fourth invention. As shown in Figure 7, the program unit 34a (control unit 8a) of the control unit 8a includes the third input unit 13.

[0047] The third input unit 13 acquires the ambient relative humidity measured by the humidity sensor 9.

[0048] Figure 8 is a flowchart showing the processing procedure of the control unit 8a of the fourth invention. As shown in Figure 8, the condensation prevention system 1a of the fourth invention differs from the third invention in that it measures the outside air relative humidity (step S8) after measuring the surface temperature of the floor 4 (step S2). In step S8 of this embodiment, the third input unit 13 of the program unit 34a shown in Figure 7 is loaded into the working memory 32, and the third input unit 13 is executed by the calculation unit 30, thereby enabling the control unit 8a to function as a means for acquiring the outside air relative humidity. Specifically, the third input unit 13 inputs (stores) the outside air relative humidity measured by the humidity sensor 9 into the data unit 33.

[0049] Furthermore, the fourth invention differs from the third invention in that, when the fan operation determination unit 12 determines that the surface temperature of the floor 4 is below a predetermined second temperature (Yes in step S7), it determines whether the outside air relative humidity is below a predetermined relative humidity (step S9). In this embodiment, when the fan operation determination unit 12 determines that the outside air relative humidity is below a predetermined relative humidity (Yes in step S9), it operates the underfloor air supply fan 7 (step S4). On the other hand, when the fan operation determination unit 12 determines that the outside air relative humidity is not below a predetermined relative humidity (No in step S9), it stops the underfloor air supply fan 7 (step S5).

[0050] A problem arose when the relative humidity of the air in the underfloor space 3 was high, making it difficult for moisture to be released quickly from the concrete of the floor slab 4. Therefore, from the viewpoint of effectively promoting the release of moisture from the concrete of the floor slab 4, the predetermined relative humidity is generally set to a relative humidity that lowers the moisture content of the concrete. Specifically, the predetermined relative humidity is preferably 60%RH or less, and more preferably 50%RH or less. In this embodiment, the predetermined second temperature is set to 50%RH. As a result, the condensation prevention system 1a of the fourth invention can effectively promote the release of moisture from the concrete of the floor slab 4.

[0051] In this embodiment, the fan operation determination unit 12 makes decisions in the order of steps S3, S6, S7, and S9, but is not limited to this configuration. The fan operation determination unit 12 may make decisions in any order of the above four steps.

[0052] [Differentiation] As described above, the configurations of the condensation prevention systems 1 and 1a of the first to fourth inventions have been explained, but the condensation prevention systems 1 and 1a of the first to fourth inventions may each include an indoor air supply fan 14. As shown in Figure 6, this modified example describes an invention in which an indoor air supply fan 14 is provided in the condensation prevention system 1a of the fourth invention.

[0053] The indoor air supply fan 14 draws air from the underfloor space 3 into the upper floor space 21. In this embodiment, the indoor air supply fan 14 is installed in the underfloor space 3. In this embodiment, for example, a filter 16 and a duct 17 are connected to the indoor air supply fan 14. The filter 16 is for purifying the air in the underfloor space 3. The duct 17 is for transporting the air from the underfloor space 3 to the living room 25 in the upper floor space 21. As a result, the indoor air supply fan 14 can ventilate the upper floor space 21.

[0054] Figure 7 is a conceptual block diagram showing an example of the configuration of a modified control unit 8a. As shown in Figure 7, the calculation unit 30 of this embodiment is communicatively connected to the indoor air supply fan 14. As a result, the operation of the indoor air supply fan 14 is controlled by the calculation unit 30.

[0055] The program unit 34a (control unit 8a) includes an airflow control unit 15. When the underfloor air supply fan 7 is operating, the airflow control unit 15 sets its airflow to be equal to or greater than that of the indoor air supply fan 14. As a result, the underfloor air supply fan 7 can draw in sufficient outside air A1 into the underfloor space 3. Therefore, the condensation prevention systems 1 and 1a of the first to fourth inventions can effectively suppress the occurrence of condensation in the underfloor space 3 caused by moisture released from the concrete of the floor slab 4.

[0056] Figure 9 is a cross-sectional view of the underfloor space 3 of the house 2 in Figures 1 and 6, cut horizontally. As shown in Figure 9, the underfloor space 3 in this embodiment is divided into multiple compartments 27 by the foundation 22. The foundation 22 includes a first foundation 22a extending in the longitudinal direction of the foundation 22 and a second foundation 22b extending intersecting the first foundation 22a. The first foundation 22a divides the foundation 22 in the vertical direction. The second foundation 22b divides the foundation 22 in the horizontal direction. The first foundation 22a and the second foundation 22b in this embodiment each include a passageway 28. The passageway 28 is for inspectors to inspect the underfloor space 3. Through such passageway 28, each compartment 27 can communicate with the air in the underfloor space 3.

[0057] In this embodiment, the underfloor air supply fan 7 and the indoor air supply fan 14 are each provided in one of the compartments 27. The compartment 27a where the underfloor air supply fan 7 is provided and the compartment 27b where the indoor air supply fan 14 is provided are separated by at least one compartment. In this specification, "separated by one compartment" refers to the positional relationship between compartments 27 that are adjacent to each other vertically or horizontally. Therefore, in this embodiment, the compartment 27a where the underfloor air supply fan 7 is provided and the compartment 27b where the indoor air supply fan 14 is provided are separated by three compartments. As a result, the air taken into the underfloor space 3 by the underfloor air supply fan 7 is thoroughly mixed with the existing underfloor air before being taken into the above-floor space 21 by the indoor air supply fan 14. Therefore, the condensation prevention systems 1 and 1a of the first to fourth inventions can suppress fluctuations in the room temperature 25, thereby improving the comfort of the room 25.

[0058] Although particularly preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the illustrated embodiments and can be implemented in various modified forms.

[0059] [Note] The present invention includes the following embodiments.

[0060] [Invention 1] A system for preventing condensation in the underfloor space of a house, The aforementioned underfloor space is equipped with a concrete floor. The aforementioned system, A first temperature sensor for measuring the outside air temperature, A second temperature sensor for measuring the surface temperature of the aforementioned earthen floor, An underfloor air supply fan for taking in outside air into the underfloor space and ventilating the underfloor space, Includes a control unit that controls the operation of the underfloor air supply fan, The control unit, A first input unit that acquires the ambient temperature measured by the first temperature sensor, A second input unit for acquiring the surface temperature of the earthen floor measured by the second temperature sensor, A fan operation determination unit that determines that the condition is met that the outside air temperature is equal to or higher than the surface temperature of the ground floor, and that activates the underfloor air supply fan, is included. A system to prevent condensation in the underfloor space. [Invention 2] A system for preventing condensation in the underfloor space of a house, The aforementioned underfloor space is equipped with a concrete floor. The aforementioned system, A first temperature sensor for measuring the outside air temperature, A second temperature sensor for measuring the surface temperature of the aforementioned earthen floor, An underfloor air supply fan for taking in outside air into the underfloor space and ventilating the underfloor space, Includes a control unit that controls the operation of the underfloor air supply fan, The control unit, A first input unit that acquires the ambient temperature measured by the first temperature sensor, A second input unit for acquiring the surface temperature of the earthen floor measured by the second temperature sensor, The system includes a fan operation determination unit that activates the underfloor air supply fan when it determines that the outside air temperature is equal to or greater than the surface temperature of the earthen floor, and that the outside air temperature is equal to or greater than a predetermined first temperature. A system to prevent condensation in the underfloor space. [Invention 3] A system for preventing condensation in the underfloor space of a house, The aforementioned underfloor space is equipped with a concrete floor. The aforementioned system, A first temperature sensor for measuring the outside air temperature, A second temperature sensor for measuring the surface temperature of the aforementioned earthen floor, An underfloor air supply fan for taking in outside air into the underfloor space and ventilating the underfloor space, Includes a control unit that controls the operation of the underfloor air supply fan, The control unit, A first input unit that acquires the ambient temperature measured by the first temperature sensor, A second input unit for acquiring the surface temperature of the earthen floor measured by the second temperature sensor, The system includes a fan operation determination unit that operates the underfloor air supply fan when it determines that the conditions are met, namely that the outside air temperature is equal to or greater than the surface temperature of the floor, and the outside air temperature is equal to or greater than a predetermined first temperature, and the surface temperature of the floor is equal to or less than a predetermined second temperature. A system to prevent condensation in the underfloor space. [4th Invention] A system for preventing condensation in the underfloor space of a house, The aforementioned underfloor space is equipped with a concrete floor. The aforementioned system, A first temperature sensor for measuring the outside air temperature, A humidity sensor for measuring the relative humidity of the outside air, A second temperature sensor for measuring the surface temperature of the aforementioned earthen floor, An underfloor air supply fan for taking in outside air into the underfloor space and ventilating the underfloor space, Includes a control unit that controls the operation of the underfloor air supply fan, The control unit, A first input unit that acquires the ambient temperature measured by the first temperature sensor, A second input unit for acquiring the surface temperature of the earthen floor measured by the second temperature sensor, A third input unit that acquires the ambient relative humidity measured by the humidity sensor, A fan operation determination unit that determines that the following conditions are met: the outside air temperature is equal to or greater than the surface temperature of the floor, the outside air temperature is equal to or greater than a predetermined first temperature, the surface temperature of the floor is equal to or less than a predetermined second temperature, and the relative humidity of the outside air is equal to or less than a predetermined relative humidity; and the underfloor air supply fan is activated. A system to prevent condensation in the underfloor space. [5th ​​Invention] The underfloor space condensation prevention system according to any one of invention 1 to 4, wherein the fan operation determination unit stops the underfloor air supply fan when it determines that the above conditions are not met. [Invention 6] Furthermore, it includes an indoor air supply fan for drawing air from the underfloor space into the upper floor space, The underfloor space condensation prevention system according to any one of invention 1 to 5, wherein the control unit includes an airflow control unit that sets the airflow of the underfloor air supply fan to be equal to or greater than the airflow of the indoor air supply fan when the underfloor air supply fan is in operation. [7th Invention] The aforementioned underfloor space is divided into multiple sections by the foundation. The underfloor air supply fan and the indoor air supply fan are each provided in one of the compartments. The underfloor space condensation prevention system according to the present invention, wherein the compartment where the underfloor air supply fan is installed and the compartment where the indoor air supply fan is installed are separated by at least one compartment. [8th Invention] A method for preventing condensation in the underfloor space of a house, The aforementioned underfloor space is equipped with a concrete floor. The aforementioned method, The steps include measuring the outside air temperature and The steps include measuring the surface temperature of the earthen floor, A step of determining whether the condition that the outside air temperature is equal to or greater than the surface temperature of the earth floor is met, When it is determined that the above conditions are met, the step of operating an underfloor air supply fan that takes in outside air into the underfloor space and ventilates the underfloor space, The step of stopping the underfloor air supply fan when it is determined that the above conditions are not met, Methods for preventing condensation in the underfloor space. [Explanation of Symbols]

[0061] 1. Condensation prevention system 2 Housing 3 Underfloor space 4. Earthen floor 5. First temperature sensor 6. Second temperature sensor 7 Underfloor air intake fan 8 Control Unit 10 First Input Section 11 Second Input Section 12 Fan operation determination unit A1 Outside air

Claims

1. A system for preventing condensation in the underfloor space of a house, The aforementioned underfloor space is equipped with a concrete floor. The aforementioned system, A first temperature sensor for measuring the outside air temperature, A second temperature sensor for measuring the surface temperature of the earthen floor, An underfloor air supply fan for taking in outside air into the underfloor space and ventilating the underfloor space, Includes a control unit that controls the operation of the underfloor air supply fan, The control unit, A first input unit that acquires the ambient temperature measured by the first temperature sensor, A second input unit for acquiring the surface temperature of the earthen floor measured by the second temperature sensor, A fan operation determination unit that determines that the condition is met that the outside air temperature is equal to or higher than the surface temperature of the ground floor, and that activates the underfloor air supply fan, is included. A system to prevent condensation in the underfloor space.

2. A system for preventing condensation in the underfloor space of a house, The aforementioned underfloor space is equipped with a concrete floor. The aforementioned system, A first temperature sensor for measuring the outside air temperature, A second temperature sensor for measuring the surface temperature of the earthen floor, An underfloor air supply fan for taking in outside air into the underfloor space and ventilating the underfloor space, Includes a control unit that controls the operation of the underfloor air supply fan, The control unit, A first input unit that acquires the ambient temperature measured by the first temperature sensor, A second input unit for acquiring the surface temperature of the earthen floor measured by the second temperature sensor, The system includes a fan operation determination unit that activates the underfloor air supply fan when it determines that the outside air temperature is equal to or greater than the surface temperature of the earthen floor, and that the outside air temperature is equal to or greater than a predetermined first temperature. A system to prevent condensation in the underfloor space.

3. A system for preventing condensation in the underfloor space of a house, The aforementioned underfloor space is equipped with a concrete floor. The aforementioned system, A first temperature sensor for measuring the outside air temperature, A second temperature sensor for measuring the surface temperature of the earthen floor, An underfloor air supply fan for taking in outside air into the underfloor space and ventilating the underfloor space, Includes a control unit that controls the operation of the underfloor air supply fan, The control unit, A first input unit that acquires the ambient temperature measured by the first temperature sensor, A second input unit for acquiring the surface temperature of the earthen floor measured by the second temperature sensor, A fan operation determination unit that determines that the conditions are met, such as the outside air temperature being equal to or greater than the surface temperature of the floor, the outside air temperature being equal to or greater than a predetermined first temperature, and the surface temperature of the floor being equal to or less than a predetermined second temperature, is activated to activate the underfloor air supply fan. A system to prevent condensation in the underfloor space.

4. A system for preventing condensation in the underfloor space of a house, The aforementioned underfloor space is equipped with a concrete floor. The aforementioned system, A first temperature sensor for measuring the outside air temperature, A humidity sensor for measuring the relative humidity of the outside air, A second temperature sensor for measuring the surface temperature of the earthen floor, An underfloor air supply fan for taking in outside air into the underfloor space and ventilating the underfloor space, Includes a control unit that controls the operation of the underfloor air supply fan, The control unit, A first input unit that acquires the ambient temperature measured by the first temperature sensor, A second input unit for acquiring the surface temperature of the earthen floor measured by the second temperature sensor, A third input unit for acquiring the ambient relative humidity measured by the humidity sensor, The system includes a fan operation determination unit that operates the underfloor air supply fan when it determines that the following conditions are met: the outside air temperature is equal to or greater than the surface temperature of the floor, the outside air temperature is equal to or greater than a predetermined first temperature, the surface temperature of the floor is equal to or less than a predetermined second temperature, and the relative humidity of the outside air is equal to or less than a predetermined relative humidity. A system to prevent condensation in the underfloor space.

5. The underfloor space condensation prevention system according to any one of claims 1 to 4, wherein the fan operation determination unit stops the underfloor air supply fan when it determines that the above conditions are not met.

6. Furthermore, it includes an indoor air supply fan for drawing air from the underfloor space into the upper floor space, The underfloor space condensation prevention system according to any one of claims 1 to 4, wherein the control unit includes an airflow control unit that, when the underfloor air supply fan is operating, sets the airflow of the underfloor air supply fan to be equal to or greater than the airflow of the indoor air supply fan.

7. The aforementioned underfloor space is divided into multiple sections by the foundation. The underfloor air supply fan and the indoor air supply fan are each provided in one of the compartments. The underfloor space condensation prevention system according to claim 6, wherein the compartment where the underfloor air supply fan is provided and the compartment where the indoor air supply fan is provided are separated by at least one compartment.

8. A method for preventing condensation in the underfloor space of a house, The aforementioned underfloor space is equipped with a concrete floor. The aforementioned method, The steps include measuring the outside air temperature and The steps include measuring the surface temperature of the earthen floor, A step of determining whether the condition that the outside air temperature is equal to or greater than the surface temperature of the earth floor is met, When it is determined that the above conditions are met, the step of operating an underfloor air supply fan that takes in outside air into the underfloor space and ventilates the underfloor space, The step of stopping the underfloor air supply fan when it is determined that the above conditions are not met, Methods for preventing condensation in the underfloor space.

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