Residential air conditioning systems

Abstract

This suppresses the occurrence of summer-type condensation in both the inter-floor space and the underfloor space. [Solution] This is an air conditioning system 1 for a house 2, which includes an underfloor space 3 surrounded by an insulated foundation 31, a first upper floor space 4, a second upper floor space 5 which is the upper part of the first upper floor space 4, an interfloor space 6 between the first upper floor space 4 and the second upper floor space 5, and an outside air inlet 34 for taking in outside air into the underfloor space 3. The system includes a ventilation fan 11 for supplying outside air taken in from the outside air inlet 34 to the first upper floor space 4 and / or the second upper floor space 5, an air conditioner 12 for supplying conditioned air to the first upper floor space 4 and / or the second upper floor space 5, an interfloor supply fan 13 for supplying conditioned air directly or indirectly to the interfloor space 6, and an interfloor / underfloor duct 14 connecting the interfloor space 6 and the underfloor space 3.

Description

Technical Field

[0001] The present invention relates to an air conditioning system for a house.

Background Art

[0002] Generally, in the case of a house with two or more stories, an inter-story space is provided between the ceiling of the first floor and the floor of the second floor. Generally, the inter-story space is a non-residential space having functions such as various wirings, piping spaces, and sound insulation between the upper and lower floors.

[0003] By the way, in summer, when the first floor or the second floor is cooled by an air conditioner, the inter-story space is also indirectly cooled, and the temperature of the inter-story space also drops. Also, although the inter-story space is supposed to be an airtight space where outside air does not enter, in the case of strong winds or the like, high-temperature and high-humidity outside air may flow in through inevitable gaps. In such a case, there was a problem of condensation occurring in the inter-story space.

[0004] In order to solve the above problems, attempts have been made to supply a part of the dehumidified conditioned air directly or indirectly to the inter-story space to reduce the humidity of the inter-story space. For example, it is proposed in Patent Document 1 below.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Disclosure of the Invention

Problems to be Solved by the Invention

[0006] In recent years, the average outside air temperature and the average outside air absolute humidity have been remarkably increasing. For example, in the past 25 years, the average outside air temperature in July has risen by about 3 to 4°C, and the average outside air absolute humidity has increased by 3 to 4 g / kg. In such a situation, similar to the above inter-story space, high-temperature and high-humidity air may be cooled in the dirt floor or the like in the under-floor space of the house and condensation may occur.

[0007] Thus, condensation that occurs in the spaces between floors and under the floor during the summer is also called summer condensation, and it can cause problems such as mold growth in these spaces, as well as unpleasant odors and stains.

[0008] This invention was devised in view of the above-mentioned problems, and its main objective is to provide a residential air conditioning system that can suppress the occurrence of summer condensation in both the inter-floor space and the underfloor space. [Means for solving the problem]

[0009] The present invention relates to an air conditioning system for a house comprising: an underfloor space enclosed by an insulated foundation; a first upper floor space; a second upper floor space which is the upper part of the first upper floor space; an interfloor space between the first upper floor space and the second upper floor space; and an outside air inlet for taking in outside air into the underfloor space, the system comprising: a ventilation fan for supplying outside air taken in from the outside air inlet to the first upper floor space and / or the second upper floor space; an air conditioner for supplying conditioned air to the first upper floor space and / or the second upper floor space; an interfloor supply fan for supplying the conditioned air directly or indirectly to the interfloor space; and an interfloor / underfloor duct connecting the interfloor space and the underfloor space. [Effects of the Invention]

[0010] By adopting the above configuration, the residential air conditioning system of the present invention can suppress the occurrence of summer condensation in both the inter-floor space and the underfloor space. [Brief explanation of the drawing]

[0011] [Figure 1] This is a conceptual cross-sectional view of a house equipped with the air conditioning system of this embodiment. [Figure 2] This is a magnified view of the second floor space. [Figure 3] This is a block diagram of the control device of this embodiment. [Figure 4] This is a flowchart showing the operating procedure of the air conditioning system of this embodiment. [Figure 5] This graph shows the change in absolute humidity when the air conditioning system of this embodiment is in operation. [Modes for carrying out the invention]

[0012] Embodiments of the present invention will be described below with reference to the drawings. The drawings contain exaggerations and representations that differ from the actual dimensional ratios of the structures in order to aid in understanding the content of the invention. Furthermore, the same or common elements are denoted by the same reference numerals throughout each embodiment, and redundant explanations 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 in the drawings.

[0013] [Housing] Figure 1 is a conceptual cross-sectional view of a house 2 equipped with the air conditioning system 1 of this embodiment. As shown in Figure 1, the house 2 of this embodiment includes an underfloor space 3, a first above-floor space 4, a second above-floor space 5, and an interfloor space 6 between the first above-floor space 4 and the second above-floor space 5.

[0014] [Underfloor space] In this embodiment, the underfloor space 3 is a space enclosed by the foundation 31, the concrete-finished floor 32, and the floor portion 41 of the first above-floor space 4. The foundation 31 is fitted with insulation material 33, and the underfloor space 3 is insulated from the outside air. The foundation 31 is also provided with an outside air inlet 34, which is an opening. Outside air is drawn into the underfloor space 3 through the outside air inlet 34. The outside air drawn into the underfloor space 3 through the outside air inlet 34 exchanges heat with geothermal energy, which has little temperature change throughout the year, via the floor 32. As a result, the underfloor space 3 can store air that is cooler in the summer and warmer in the winter compared to the outside air (hereinafter sometimes simply referred to as "underfloor air").

[0015] [First floor space, second floor space] The first floor space 4 is one of the floor spaces on the relatively lower floor of the house 2. The second floor space 5 is the upper floor portion adjacent to the first floor space 4 via the inter-floor space 6. When the house 2 is a two-story building as in the present embodiment, the first floor space 4 corresponds to the first floor portion of the house 2, and the second floor space 5 corresponds to the second floor portion of the house 2. Note that when the house 2 is a three-story building, the first floor space 4 may correspond to the second floor portion and the second floor space 5 may correspond to the third floor portion.

[0016] In the present embodiment, the first floor space 4 is a space partitioned by a floor portion 41, a ceiling portion 42, and an outer wall portion 43. The first floor space 4 is, for example, a general living space where a living room, a washroom, a toilet, a bathroom, a hall, etc. (all not shown) are provided. Further, a heat insulating material is arranged on the outer wall portion 43 of the first floor space 4.

[0017] In the present embodiment, the second floor space 5 is a space partitioned by a floor portion 51, a ceiling portion 52, and an outer wall portion 53. The second floor space 5 is also a general living space where, for example, a living room, a toilet, a hall, etc. (all not shown) are provided. The second floor space 5 is fluidly connected to the first floor space 4 via a staircase, a hall, etc. Further, a heat insulating material is arranged on the ceiling portion 52 and the outer wall portion 53 of the second floor space 5.

[0018] [Inter-floor space] The inter-floor space 6 is a space between the first floor space 4 and the second floor space 5. Specifically, it is partitioned by the ceiling portion 42 of the first floor space 4, the floor portion 51 of the second floor space 5, and an outer wall portion 61 such as a curtain board. The inter-floor space 6 is, for example, a low-height non-living space used as a space for arranging ducts, various wirings, pipes, etc. described later. A heat insulating material is arranged on the outer wall portion 61 of the inter-floor space 6. Therefore, the inter-floor space 6 is a space having airtightness substantially thermally insulated from the outside air except for inevitable gaps. Further, a temperature sensor 62 for measuring the temperature of the inter-floor space 6 is provided in the inter-floor space 6.

[0019] [Air conditioning system] The air conditioning system 1 of this embodiment includes a ventilation fan 11, an air conditioner 12, an inter - floor air supply fan 13, an inter - floor / under - floor duct 14, a damper 15, and a control unit 70.

[0020] [Ventilation fan] The ventilation fan 11 is provided, for example, in the under - floor space 3 and is arranged so as to be able to take in outside air from the outside air inlet 34 of the foundation 31 into the under - floor space 3. Also, in this embodiment, one end of a ventilation duct 7 is connected to the ventilation fan 11. The other end of the ventilation duct 7 penetrates the floor part 41 and can be located, for example, in the first above - floor space 4 and / or the second above - floor space 5 (details will be described later). Therefore, when the ventilation fan 11 is operated, outside air is supplied to the first above - floor space 4 and / or the second above - floor space 5 via the under - floor space 3 and the ventilation duct 7 for ventilation. The air volume of the ventilation fan 11 may be appropriately set based on the required ventilation rate of the house 2. Note that the other end of the ventilation duct 7 of this embodiment is located near the suction port of the indoor unit 12a of the air conditioner 12 described later (details will be described later). [Air conditioner]

[0021] The air conditioner 12 generates air for air conditioning, especially dehumidified air, and supplies it to the first above - floor space 4 and / or the second above - floor space 5. In this embodiment, the dehumidified air for air conditioning can be generated during the cooling operation or the dehumidifying operation of the air conditioner 12. In addition to the dehumidifying operation and the cooling operation, the air conditioner 12 may be enabled to perform a heating operation or the like.

[0022] The air conditioner 12 is composed of, for example, a general heat - pump type household separate - type air conditioner. For this reason, the air conditioner 12 includes an indoor unit 12a and an outdoor unit 12b as a set. The indoor unit 12a is arranged, for example, in the second above - floor space 5. In this embodiment, the indoor unit 12a is used as the heat source of the whole - house air - conditioning system of the house 2. More specifically, the indoor unit 12a is arranged in the air - conditioning chamber 20 of the air - conditioning unit 200 of the whole - house air - conditioning system installed in the second above - floor space 5 (details will be described later).

[0023] The outdoor unit 12b is located outside the house 2. The outdoor unit 12b has a built-in outdoor temperature sensor 8 for measuring the outside air temperature.

[0024] [Whole building air conditioning system]

[0025] Figure 2 is a partially enlarged view of the second above-floor space 5, which includes the air conditioning unit 200. As shown in Figures 1 and 2, the air conditioning unit 200 of the whole-house air conditioning system comprises an indoor unit 12a, an air conditioning chamber 20, and various fans.

[0026] The air conditioning chamber 20 is formed in a box shape that defines an internal space. The air conditioning chamber 20 also has an inlet 21 and two outlets 22 and 23. The inlet 21 is provided, for example, at the top of the air conditioning chamber 20, and air from the second above-floor space 5 is drawn into the air conditioning chamber 20 from there. The outlets 22 and 23 are provided, for example, at the bottom and top of the air conditioning chamber 20, and the first air conditioning duct 24 and the second air conditioning duct 25 are connected to them, respectively.

[0027] The first air conditioning duct 24 extends downward from the outlet 22, passes through the interfloor space 6, and connects to an opening in the ceiling 42 of the first above-floor space 4. The first air conditioning duct 24 is also equipped with a first supply fan 24a for pressurizing and sending conditioned air from the air conditioning chamber 20 to the first above-floor space 4.

[0028] The second air conditioning duct 25 extends upward from the outlet 23, passes through the attic, and connects to an opening in the ceiling 52 of the second floor space 5. The second air conditioning duct 25 is also equipped with a second supply fan 25a for pressurizing and sending conditioned air from the air conditioning chamber 20 to the second floor space 5.

[0029] Furthermore, the other end of the ventilation duct 7 is connected to the upper part of the air conditioning chamber 20 in this embodiment. Therefore, underfloor air (outside air) can also be supplied to the air conditioning chamber 20.

[0030] In the whole-house air conditioning system configured as described above, during cooling or dehumidification operation in the summer, the indoor unit 12a of the air conditioner 12 operates in cooling or dehumidification mode, and the ventilation fan 11, the first supply fan 24a, and the second supply fan 25a are driven. As a result, air from the second above-floor space 5 and under-floor air are supplied to the air conditioning chamber 20. The indoor unit 12a cools and dehumidifies the supplied air by heat exchange. The conditioned air cooled and dehumidified by the indoor unit 12a is supplied to the first above-floor space 4 and the second above-floor space 5 via the first air conditioning duct 24 and the second air conditioning duct 25.

[0031] The conditioned air supplied to the first and second floor spaces 4 and 5 lowers the temperature of living spaces, etc., and is returned as return air through gaps in doors and windows, halls within the house, etc., and is taken back into the air conditioning chamber 20 from the inlet 21. Through this air circulation, the house 2 is ventilated and air-conditioned (dehumidified). In a preferred embodiment, it is desirable that a filter 26 for removing airborne particles and viruses be provided downstream of the outlet of the indoor unit 12a inside the air conditioning chamber 20. Such a whole-house air conditioning system is desirable because it can perform ventilation, air conditioning, and air purification simultaneously.

[0032] Furthermore, if House 2 is a highly airtight industrialized house, it is desirable to operate the whole-house air conditioning system continuously for 24 hours to ensure the necessary ventilation rate. The following example is explained assuming a situation where the whole-house air conditioning system (air conditioner 12) is operating continuously during the summer.

[0033] [Inter-floor air supply fan] The inter-floor air supply fan 13 is a fan for supplying conditioned air to the inter-floor space 6, either directly or indirectly. Supplying conditioned air directly to the inter-floor space 6 means, for example, supplying conditioned air blown out from the outlet of the indoor unit 12a or conditioned air stored in the air conditioning chamber 20 to the inter-floor space 6 via ducts or the like. Supplying conditioned air indirectly to the inter-floor space 6 means, for example, supplying conditioned air blown out from the outlet of the indoor unit 12a or conditioned air in the air conditioning chamber 20 to the first above-floor space 4 or the second above-floor space 5, and then supplying a portion of it to the inter-floor space 6. In other words, the former method allows for the supply of lower-humidity conditioned air to the inter-floor space 6 compared to the latter method.

[0034] In this embodiment, the interfloor air supply fan 13 is installed, for example, inside the air conditioning chamber 20. In other embodiments, the interfloor air supply fan 13 may be installed in the interfloor space 6, etc. A duct 13a (Figure 2) is connected to the interfloor air supply fan 13. The duct 13a penetrates the floor portion 51 of the second above-floor space 5 and communicates with the interfloor space 6. Therefore, by operating the interfloor air supply fan 13, the conditioned air in the air conditioning chamber 20 is directly supplied to the interfloor space 6. In other embodiments, the interfloor air supply fan 13 may, for example, supply the air from the conditioned second above-floor space 5 to the interfloor space 6. In this case, the conditioned air is supplied to the interfloor space 6 indirectly.

[0035] [Inter-floor / underfloor ducting] Returning to Figure 1, the inter-floor / underfloor duct 14 connects the inter-floor space 6 and the underfloor space 3, allowing air to circulate between them. In this embodiment, the inter-floor / underfloor duct 14 is, for example, an insulated duct extending vertically through the first upper floor space 4, with its upper end located in the inter-floor space 6 and its lower end located in the underfloor space 3. In a preferred embodiment, the inter-floor / underfloor duct 14 is preferably built into a partition wall or the like.

[0036] [Damper] The damper 15 is for opening and closing the interfloor / underfloor duct 14, and at least switches the interfloor / underfloor duct 14 to an open or closed state. When the damper 15 is open, air can flow between the interfloor space 6 and the underfloor space 3 via the interfloor / underfloor duct 14. On the other hand, when the damper 15 is closed, air flow between the interfloor space 6 and the underfloor space 3 is blocked. In a preferred embodiment, the damper 15 may be an electrically operated damper that can be remotely switched between open and closed states using a motor or the like.

[0037] [Control Unit] The control unit 70 is located in a position accessible to users or service personnel, and in this embodiment, it is positioned in a partition wall of the house 2. Figure 3 shows a schematic block diagram of the control unit 70 in this embodiment. The control unit 70 in this embodiment can control, for example, a ventilation fan 11, an air conditioner 12, an inter-floor air supply fan 13, and a damper 15, etc., according to a predetermined processing procedure.

[0038] The control unit 70 of this embodiment is configured using a computer, for example, and includes a calculation unit 71 consisting of a CPU (Central Processing Unit), a storage unit 72 in which processing procedures are stored, and a working memory 73 for reading control procedures from the storage unit 72.

[0039] In this embodiment, the calculation unit 71 is connected to the air conditioner 12 in a communicative manner. This allows the calculation unit 71 to acquire the outside air temperature from the outside air temperature sensor 8 of the outdoor unit 12b and control the operation of the air conditioner 12 (for example, set temperature, airflow, etc.). Furthermore, the calculation unit 71 is connected to the ventilation fan 11, the inter-floor air supply fan 13, the damper 15, the first air supply fan 24a, the second air supply fan 25a, and the temperature sensor 62 in a communicative manner.

[0040] The memory unit 72 stores, for example, a processing procedure (program) for controlling the operation of the above-mentioned equipment. This procedure is loaded into the working memory 73 and executed by the arithmetic unit 71.

[0041] [Processing procedure of the control unit] Figure 4 shows an example of the processing procedure of the control unit 70. Hereinafter, an example of the processing procedure of the control unit 70 in this embodiment will be described with reference to Figure 4.

[0042] First, the control unit 70 acquires the outside air temperature (step S1). The outside air temperature is acquired from the outside air temperature sensor 8 of the outdoor unit 12b of the air conditioner 12. The acquired outside air temperature data is stored in the storage unit 72.

[0043] Next, the control unit 70 determines whether the acquired outside air temperature is above a predetermined temperature (step S2). Step S2 is performed to determine whether the current situation is such that summer-type condensation is likely to occur in the inter-floor space 6 and the underfloor space 3. For this purpose, the threshold temperature in step S2 may be set to, for example, 18°C ​​or higher, preferably 20°C or higher, so as to identify the high-temperature period from spring onwards. In this embodiment, the predetermined temperature in step S2 is set to 25°C.

[0044] If the answer in step S2 is Yes, it is assumed that the conditions are such that summer condensation is likely to occur. Therefore, the control unit 70 acquires the temperature of the inter-floor space 6 (step S3). The temperature of the inter-floor space 6 is acquired from the temperature sensor 62. The acquired temperature data of the inter-floor space 6 is stored in the storage unit 72.

[0045] Next, the control unit 70 determines whether the outside air temperature is higher than the temperature of the inter-floor space 6 (step S4). When warm outside air flows into the inter-floor space 6, the temperature of the inter-floor space 6 rises. Furthermore, when the warmed air from the inter-floor space 6 is introduced into the underfloor space 3, the temperature of the underfloor space 3 also rises, making it difficult to obtain the geothermal cooling effect. In this embodiment, to prevent such a situation, if the outside air temperature is higher than the temperature of the inter-floor space 6 (Yes in step S4), the control unit 70 operates the inter-floor air supply fan 13 (step S5). This allows dehumidified conditioned air with low absolute humidity to be supplied (directly in this embodiment) to the inter-floor space 6.

[0046] Next, the control unit 70 opens the damper 15 of the inter-floor / underfloor duct 14 that connects the inter-floor space 6 and the underfloor space 3 (step S6). In summer, the temperature inside the building of the house 2 to which air-conditioned (cooled) air is supplied (the average temperature when the underfloor space 3, the upper floor space 5, and the inter-floor space 6 are assumed to be a single space) is usually lower than the temperature of the outside air. Therefore, the pressure acting from the inside of the house to the outside of the house increases as you go lower in the house 2. As a result, the air in the inter-floor space 6 is drawn towards the underfloor space 3 by the pressure from the underfloor space 3 to the outside of the house. Therefore, when the damper 15 is in the open position, the air in the inter-floor space 6 is transported to the underfloor space 3 without the use of any special power due to the above action.

[0047] Through the process described above, dehumidified conditioned air is supplied to the inter-floor space 6, and a portion of this air is also supplied to the underfloor space 3 via the inter-floor / underfloor duct 14. As a result, the air conditioning system 1 of this embodiment can reduce the absolute humidity in both the inter-floor space 6 and the underfloor space 3, and consequently suppress summer condensation in both the inter-floor space 6 and the underfloor space 3.

[0048] In other embodiments, the control unit 70 may have a calendar function capable of identifying the current date and time. In such cases, the control unit 70 can refer to the calendar function without performing steps S1 to S4 above and determine whether the current time is during the period from early spring to early summer when summer condensation is likely to occur.

[0049] In a preferred embodiment, the control unit 70 of this embodiment may increase the airflow of the ventilation fan 11 while steps S5 and S6 are being performed (step S7). When conditioned air is transported from the interfloor space 6 to the underfloor space 3, the amount of outside air drawn in from the outside air inlet 34 of the foundation 31 decreases in the underfloor space 3, which may reduce the ventilation rate of the house 2. However, this problem can be solved by adding a process to increase the airflow of the ventilation fan 11, as in step S7. In other words, it is desirable to increase the airflow of the ventilation fan 11 during the period when the interfloor supply air fan 13 is operating and the damper 15 is open. By performing such a process, it is possible to suppress the occurrence of summer condensation in both the underfloor space 3 and the interfloor space 6 without impairing the ventilation rate.

[0050] If "No" is determined in step S2 or step S4, it can be considered that summer condensation is unlikely to occur in the interfloor space 6, etc., at that point. Therefore, in such a situation, the control unit 70 does not operate the interfloor air supply fan 13 and closes the damper 15 of the interfloor / underfloor duct 14 that connects the interfloor space 6 and the underfloor space 3 (step S6).

[0051] Figure 5 shows the results of measuring the absolute humidity of the outside air, underfloor space, and inter-floor space after installing the air conditioning system of this embodiment in a house. The conditions during verification were as follows: Verification period: June 7, 2024 - July 2, 2024 Outdoor temperature during testing: approximately 17.7°C to 34°C Location of verification: Somewhere in Fukuoka Prefecture Floor area of ​​the house: 120m² 2 Room temperature at the start of the test: 23℃ Indoor relative temperature at the start of the test: 70%RH Inter-floor air supply fan running continuously, airflow 50 m³ 3 / h Air conditioner settings: Cooling mode, set temperature 25℃

[0052] As is clear from Figure 5, at the start of the verification (when the air conditioning system was started), the absolute humidity in the underfloor space, the interfloor space, and the outside air were all almost the same. However, as time passed, it was confirmed that the absolute humidity in the underfloor space decreased by an average of approximately 1.4 g / kg' compared to the absolute humidity of the outside air. Furthermore, it was confirmed that the absolute humidity in the interfloor space remained stable at approximately 10.0 g / kg'. After the verification, visual inspection of the interfloor space and underfloor space revealed no condensation, confirming that the present invention is effective in suppressing summer-type condensation.

[0053] 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.

[0054] [Note] The present invention includes the following embodiments.

[0055] [Invention 1] An air conditioning system for a house comprising an underfloor space enclosed by an insulated foundation, a first upper floor space, a second upper floor space which is the upper part of the first upper floor space, an interfloor space between the first upper floor space and the second upper floor space, and an outside air inlet for bringing outside air into the underfloor space, A ventilation fan for supplying outside air taken in from the outside air inlet to the first and / or second floor space, An air conditioner for supplying conditioned air to the first and / or second floor space, An inter-floor air supply fan for supplying the aforementioned conditioned air directly or indirectly to the inter-floor space, An inter-floor / underfloor duct that connects the inter-floor space and the underfloor space, An air conditioning system including this. [2nd Invention] It further includes an ambient temperature sensor for measuring ambient temperature and a control unit, The air conditioning system according to the present invention 1, wherein the control unit operates the inter-floor air supply fan while the conditions are met that the outside air temperature is above a predetermined temperature and the outside air temperature is higher than the temperature of the inter-floor space. [Invention 3] Includes dampers for opening and closing the aforementioned inter-floor and underfloor ducts, The air conditioning system according to the present invention, wherein the control unit increases the airflow of the ventilation fan while the inter-floor air supply fan is operating and the damper is in the open state. [4th Invention] The air conditioning system according to the present invention, wherein the control unit operates the damper to a closed state when the inter-floor air supply fan is stopped. [5th ​​Invention] A house equipped with an air conditioning system according to any one of inventions 1 to 4. [Explanation of symbols]

[0056] 1. Air conditioning system 2 Housing 3 Underfloor space 4. First floor space 5. Second floor space 6th floor space 11 Ventilation fan 12. Air conditioner 13th floor air supply fan 14-story underfloor ducting 15 dampers 70 Control Unit 31 Basics 34. Outside air intake

Claims

1. An air conditioning system for a house comprising an underfloor space enclosed by an insulated foundation, a first upper floor space, a second upper floor space which is the upper part of the first upper floor space, an interfloor space between the first upper floor space and the second upper floor space, and an outside air inlet for bringing outside air into the underfloor space, A ventilation fan for supplying outside air taken in from the outside air inlet to the first and / or second floor space, An air conditioner for supplying conditioned air to the first and / or second floor space, An inter-floor air supply fan for supplying the aforementioned conditioned air directly or indirectly to the inter-floor space, An inter-floor / underfloor duct that connects the aforementioned inter-floor space and the aforementioned underfloor space, An air conditioning system including this.

2. It further includes an ambient temperature sensor for measuring ambient temperature and a control unit, The air conditioning system according to claim 1, wherein the control unit operates the inter-floor air supply fan while the conditions are met that the outside air temperature is above a predetermined temperature and the outside air temperature is higher than the temperature of the inter-floor space.

3. Includes dampers for opening and closing the inter-floor and underfloor ducts, The air conditioning system according to claim 2, wherein the control unit increases the airflow of the ventilation fan while the inter-floor air supply fan is operating and the damper is in the open state.

4. The air conditioning system according to claim 3, wherein the control unit operates the damper to a closed state when the inter-floor air supply fan is stopped.

5. A house equipped with an air conditioning system according to any one of claims 1 to 4.

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