Air conditioning system

Abstract

This technology provides energy-saving solutions while also preventing moisture-laden outside air from entering from the outdoors. [Solution] The air conditioning system (1000) includes an air conditioner (300) for air conditioning an indoor area to be air-conditioned, and an air supply fan (122) for supplying conditioned air (210) for the area to be air-conditioned to the space above the ceiling (16). The air supply fan (122) supplies conditioned air (210) for the area to be air-conditioned to the space above the ceiling (16) such that the air pressure in the space above the ceiling (16) is higher than the air pressure outside. By creating a positive pressure in the space above the ceiling (16) relative to the outside, it is possible to suppress the intrusion of outside air into the space above the ceiling (16).

Description

Technical Field

[0006] , ,

[0001] The present disclosure relates to an air conditioning system.

Background Art

[0002] In a building, a configuration for preventing condensation in the ceiling space is disclosed (see, for example, Patent Document 1). In Patent Document 1, it is stated that by forcibly exhausting the air in the ceiling space to the outside, conditioned air is drawn from the conditioned space into the ceiling space to prevent condensation in the ceiling.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the air in the ceiling space is forcibly exhausted to the outside, the ceiling space becomes negative pressure with respect to the outside. If there are gaps in the outer wall of the building, outside air containing moisture may enter from the outside, and condensation may occur. In addition, since the conditioned air drawn from the conditioned space into the ceiling space is always forcibly exhausted, there is room for improvement from the perspective of energy saving.

[0005] This present disclosure has been made in view of such a situation, and an object thereof is to provide a technology capable of suppressing the intrusion of outside air containing moisture from the outside while saving energy.

Means for Solving the Problems

[0006] To solve the above problems, an air conditioning system in one aspect of the present disclosure comprises an air conditioner for air conditioning an indoor area to be air-conditioned, and a supply fan for supplying conditioned air from the area to be air-conditioned to the space above the ceiling. The supply fan supplies conditioned air from the area to be air-conditioned to the space above the ceiling such that the air pressure in the space above the ceiling is higher than the air pressure outside. [Effects of the Invention]

[0007] According to this disclosure, it is possible to suppress the intrusion of humid outside air from the outdoors while saving energy. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a schematic diagram showing the configuration of a house in which the air conditioning system according to this embodiment is installed. [Figure 2] Figure 2 is a functional block diagram showing the configuration of the air conditioning system controller. [Figure 3] Figure 3 is a flowchart showing the control of air supply to the ceiling space based on differential pressure. [Figure 4] Figure 4 is a flowchart showing the control of air supply to the ceiling space based on humidity differences. [Figure 5] Figure 5 shows a modified version of Figure 1. [Modes for carrying out the invention]

[0009] Before specifically describing the embodiments of this disclosure, an overview of the embodiments will be provided. In this embodiment, an air conditioning system that provides whole-house air conditioning in a building having multiple rooms will be described as an example.

[0010] In the air conditioning system of this embodiment, a general-purpose air conditioner is installed in an air conditioning room, which is a separate space from the living rooms of the building's residents. The conditioned air blown out from the air conditioner is piped into the ceiling space. Air is transported to each room through the constructed ducts. In such a situation, if the duct insulation is insufficient and there are gaps in the building's exterior walls, moisture-laden outside air may enter the attic through the gaps, potentially causing condensation on the duct surface. Since the gaps in the building's exterior walls and the insulation performance of the ducts depend on the precision of the construction by the builder, it is difficult to reliably prevent condensation in the attic. To improve this, in the air conditioning system disclosed herein, the supply fan supplies conditioned air from the area to be air-conditioned to the attic so that the air pressure in the attic is higher than the air pressure outside. By supplying conditioned air from the area to be air-conditioned to the attic, the temperature difference between the duct surface and the attic is reduced, suppressing the occurrence of condensation on the duct surface. In addition, by supplying air so that the air pressure in the attic is higher than the air pressure outside, it is possible to suppress the intrusion of moisture-laden outside air from the outside into the attic.

[0011] The embodiments described below all represent preferred specific examples of the present disclosure. Therefore, the numerical values, shapes, materials, components, arrangement and connection configurations of components, as well as the steps (processes) and their order shown in the following embodiments are examples and are not intended to limit the present disclosure. Accordingly, among the components in the following embodiments, those components that are not described in the independent claims representing the highest-level concepts of the present disclosure will be described as optional components. In addition, substantially identical components are denoted by the same reference numerals in each figure, and redundant explanations are omitted or simplified. (Examples) Referring to Figure 1, the configuration of the air conditioning system 1000 according to an embodiment of this disclosure will be described. Figure 1 is a schematic diagram showing the configuration of a house 500 in which the air conditioning system 1000 according to this embodiment is installed. Here, the house 500 may be a single-family dwelling in an apartment building or other multi-unit dwelling, or it may be a detached house. The house 500 includes a first living room 10a, a second living room 10b, a corridor 14, an air conditioning room 18, and an attic 16, all collectively referred to as living rooms 10.

[0012] The living room 10 is a space such as a room, a living room, a dining room, or a kitchen, and is a space for people to live in a building. The living room 10 is a space (air-conditioning target area) to be air-conditioned by the air-conditioning system 1000.

[0013] The passageway 14 is a space adjacent to the living room 10 such as a corridor or an entrance hall, and is a space through which residents pass when moving between different living rooms 10.

[0014] The air-conditioning room 18 is a space independent of the living room 10, the passageway 14, and the ceiling space 16. An air-conditioning unit 300 described later is installed in the air-conditioning room 18, and the whole house 500 is air-conditioned by the air conditioned in the air-conditioning room 18 being conveyed to the living room 10. [[ID=I0]]

[0015] The ceiling space 16 is a space existing above the living room 10, the passageway 14, and the air-conditioning room 18 with the ceiling in between, and a branch chamber 140 described later is installed. Details of the branch chamber 140 will be described later.

[0016] The air-conditioning system 1000 is composed of a combination of an air-conditioning unit 300, a branch chamber 140, a ventilation device 104, a ceiling humidity sensor 452, an outdoor humidity sensor 454, a differential pressure gauge 456, a living room temperature sensor 458, a supply air fan 122, and a system controller 40.

[0017] The air-conditioning unit

[0018] 300 is a device for adjusting the temperature of the air in the air-conditioning room 18. The air-conditioning unit 300 includes a housing 330, an air conditioner 310, a conveying fan 120, and a filter 320. The housing 330 is formed in a hollow box shape and constitutes the outer shell of the air-conditioning unit 300.

[0019] The air conditioner 310 is built into the housing 330 and air-conditions the air taken into the interior of the housing from the air-conditioning room 18.

[0020] The conveying fan 120 is a fan that conveys the air conditioned by the air conditioner 310 to the living room 10 as conditioned air 210. The conveying fan 120 is arranged on the downstream side of the air conditioner 310.

[0021] The filter 320 is arranged inside the housing 330 between the air conditioner 310 and the conveying fan 120. In other words, the filter 320 is arranged on the downstream side of the air conditioner 310 and the upstream side of the conveying fan 120. The filter 320 removes dust, dirt, etc. from the air before the air is conveyed from the air conditioning chamber 18 to the living room 10 by the conveying fan 120. By passing through the filter 320, the conveying fan 120 can convey the cleaned air to the living room 10.

[0022] The branch chamber 140 is arranged in the ceiling space 16 and branches the air conveyed from the conveying fan 120 to the first living room 10a and the second living room 10b. Here, the housing 330 and the branch chamber 140 are connected in a ventilable manner by a conveying duct 130. Also, the branch chamber 140 and the first living room 10a are connected in a ventilable manner by a branch conveying duct 142a. Also, the branch chamber 140 and the second living room 10b are connected in a ventilable manner by a branch conveying duct 142b. Thus, since the air conditioned by the air conditioner 310 is conveyed to the living room 10, which is the air conditioning target area, by the conveying fan 120, it can be said that indirectly the air conditioner 310 is air conditioning the air conditioning target area.

[0023] The ventilation device 104 is a device that takes in outdoor air into the indoor area. The ventilation device 104 is connected to the outer wall of the house 500 via, for example, an outdoor air introduction duct 102, and takes in outdoor air by the rotation of a fan. The taken-in outdoor air is supplied as outdoor air 200 to the air conditioning chamber 18 from an outdoor air inlet 100 provided in the air conditioning chamber 18. Note that the ventilation device 104 may be configured to take in outdoor air into the indoor area and discharge indoor air to the outdoor area. Also, when the ventilation device 104 is configured to exchange indoor air and outdoor air, heat exchange may be performed between the indoor air and the outdoor air.

[0024] The attic humidity sensor 452 is placed in the attic 16 and detects the humidity of the air in the attic 16. The attic humidity sensor 452 is communicatively connected to the controller 460 (described later) and outputs the detected humidity of the air in the attic 16 to the controller 460.

[0025] The outdoor humidity sensor 454 is placed outdoors and detects the humidity of the outdoor air. The outdoor humidity sensor 454 is communicatively connected to the controller 460 (described later) and outputs the detected outdoor air humidity to the controller 460. The outdoor humidity sensor 454 can be placed anywhere as long as it can detect the humidity of the outdoor air. For example, it may be placed in the ventilation device 104 and configured to detect the humidity of the air taken in from outdoors via the outdoor air intake duct 102.

[0026] The differential pressure gauge 456 detects the pressure difference between the air pressure in the attic 16 and the air pressure outside. Here, air pressure refers to atmospheric pressure, and the air pressure outside can be rephrased as atmospheric pressure. The differential pressure gauge 456 is communicatively connected to the controller 460 described later and outputs the detected pressure difference between the attic 16 and the outside to the controller 460.

[0027] The room temperature sensor 458 detects the air temperature in room 10. Here, the air temperature in the first room 10a is detected by room temperature sensor 458a, and the air temperature in the second room 10b is detected by room temperature sensor 458b. The room temperature sensor 458 is communicatively connected to the controller 460 described later, and outputs the detected air temperature of room 10 to the controller 460.

[0028] The supply air fan 122 is a device that supplies conditioned air 210 supplied to the living room 10, which is the area to be air-conditioned, as supply air 208 to the space above the ceiling 16. The supply air fan 122 supplies air from the living room 10 to the space above the ceiling 16 so that the air pressure in the space above the ceiling 16 is higher than the air pressure outside. Here, the supply air fan 122 located in the first living room is referred to as supply air fan 122a, and the supply air fan 122 located in the second living room is referred to as supply air fan 122b. Details of the control of the supply air fan 122 will be described later.

[0029] The controller 460 is a control device that controls the entire air conditioning system 1000. The controller 460 has a computer system that includes a processor and memory. The computer system functions as a control unit when the processor executes a program stored in memory. The controller 460 may be provided by recording it on a non-volatile recording medium such as a memory card, or by providing it via a telecommunications line such as the Internet.

[0030] The controller 460 is installed, for example, in the first living room 10a, and controls the equipment that makes up the air conditioning system 1000 based on information such as setting information entered and set by the user, humidity acquired by the ceiling humidity sensor 452 and the outdoor humidity sensor 454, differential pressure acquired by the differential pressure gauge 456, and temperature acquired by the living room temperature sensor 458. In this embodiment, the controller 460 is installed in the first living room 10a as an example, but the controller 460 may be installed anywhere as long as it can control the air conditioning system 1000.

[0031] For example, regarding the control of the air conditioning system 1000, when a user activates the air conditioning system 1000, the controller 460 acquires the indoor target temperature set by the user as setting information. Here, the indoor target temperature is the temperature at which the user feels comfortable. Furthermore, the controller 460 acquires the temperature of each room 10 from the room temperature sensor 458. Based on the indoor target temperature and the temperature of each room 10, the controller 460 determines the control conditions for the air conditioning unit 300.

[0032] In this way, the air conditioning system 1000 provides air conditioning to the living room 10 based on setting information such as the target indoor temperature entered and set by the user, and information obtained from various sensors.

[0033] Next, with reference to Figure 2, the configuration of the controller 460 involved in the control of the supply air fan 122 will be explained in detail. Figure 2 is a functional block diagram showing the configuration of the controller 460 of the air conditioning system 1000.

[0034] The controller 460 includes a ceiling humidity acquisition unit 462, an outdoor humidity acquisition unit 464, a differential pressure acquisition unit 466, and an air supply fan control unit 468.

[0035] The attic humidity acquisition unit 462 is connected to the attic humidity sensor 452 in a communication manner. The attic humidity acquisition unit 462 acquires the humidity of the air in the attic 16 detected by the attic humidity sensor 452.

[0036] The outdoor humidity acquisition unit 464 is connected to the outdoor humidity sensor 454 in a communication manner. The outdoor humidity acquisition unit 464 acquires the humidity of the outdoor air detected by the outdoor humidity sensor 454.

[0037] The differential pressure acquisition unit 466 is connected to the differential pressure gauge 456 in a communication manner. The differential pressure acquisition unit 466 acquires the differential pressure between the air pressure in the attic detected by the outdoor humidity sensor 454 and the air pressure outside.

[0038] The air supply fan control unit 468 is connected to the ceiling humidity acquisition unit 462, the outdoor humidity acquisition unit 464, and the differential pressure acquisition unit 466. The air supply fan control unit 468 controls the air supply fan 122 based on the humidity acquired by the ceiling humidity acquisition unit 462 and the outdoor humidity acquisition unit 464, and the differential pressure between the outdoors and the ceiling acquired by the differential pressure acquisition unit 466.

[0039] Next, the control of the air supply fan 122 will be explained in detail with reference to Figure 3. Figure 3 is a flowchart showing the control of air supply to the ceiling space 16 based on differential pressure. Here, S in Figure 3 is an abbreviation for step (process). Also, the numbers assigned to S are examples and are not intended to limit the order of processing.

[0040] First, the humidity of the air in the attic 16 detected by the attic humidity sensor 452 is acquired by the attic humidity acquisition unit 462 (S101).

[0041] Next, it is determined whether the humidity of the acquired air in the space above the ceiling 16 is above a predetermined threshold (S102).

[0042] If the humidity of the air in the attic 16 is above a predetermined threshold (S102: YES), the airflow of the supply fan 122 is increased (S103). Note that increasing the airflow from a state of 0 is also included in increasing the airflow. In other words, switching the supply fan 122 from a stopped state to an operating state is also included in increasing the airflow. If the humidity of the air in the attic 16 is below a predetermined threshold (S102: NO), the differential pressure acquisition unit 466 acquires the differential pressure between the air pressure in the attic 16 detected by the differential pressure gauge 456 and the air pressure outside (S104).

[0043] Next, it is determined whether the air pressure in the attic 16 is higher than the air pressure outside (S105).

[0044] If the air pressure in the attic 16 is higher than the outdoor air pressure (S105: YES), the supply fan 122 is stopped (S106). If the air pressure in the attic 16 is lower than the outdoor air pressure (S105: NO), the supply fan 122 is started (S107). When the supply fan 122 is started, the airflow rate of the supply fan 122 is set based on the differential pressure detected by the differential pressure gauge 456 so that the air pressure in the attic 16 is higher than the outdoor air pressure.

[0045] Unlike conventional methods of forcibly exhausting conditioned air from the ceiling space, this control of the supply fan 122 maintains a higher air pressure in the ceiling space 16 than the outdoor air pressure. In other words, the ceiling space 16 is under positive pressure relative to the outside, suppressing the intrusion of humid outside air. Furthermore, unlike conventional methods, the conditioned air 210 is not discharged to the outside from the ceiling space 16, resulting in less waste and energy savings.

[0046] In addition to the configuration shown in Figure 1, a through-hole 20 may be provided in the ceiling of the air conditioning room 18 to allow ventilation between the air conditioning room 18 and the space above the ceiling 16. In the air conditioning room 18, the air is transported by the transport fan 120, resulting in negative pressure relative to the space above the ceiling 16. Therefore, with this configuration, the conditioned air 210 supplied to the space above the ceiling 16 circulates from the space above the ceiling 16 through the through-hole 20 back to the air conditioning room 18. In other words, because the air conditioning room 18 is under negative pressure relative to the space above the ceiling 16, even if there are gaps in the exterior walls of the house 500, the air preferentially flows into the through-hole 20 provided in the ceiling of the air conditioning room 18. With this configuration, even if there are gaps in the exterior walls of the house 500, the conditioned air 210 is less likely to flow out from the space above the ceiling 16, thus reducing waste and saving energy. In other words, condensation in the space above the ceiling 16 can be suppressed while saving energy. Furthermore, in order to make it easier to maintain positive pressure in the space above the ceiling 16, it is preferable that the size of the through-hole 20 be smaller than the outlet of the air supply fan 122.

[0047] Furthermore, this disclosure allows the supply fan 122 to be switched between operating and stopped states as appropriate based on the differential pressure between the air pressure in the attic 16 detected by the differential pressure gauge 456 and the air pressure outside. When the air pressure in the attic 16 is lower than the air pressure outside, the supply fan 122 is set to operating state, and conditioned air 210 is supplied to the attic 16, thereby creating a positive pressure in the attic 16 relative to the outside. Also, when the air pressure in the attic 16 is higher than the air pressure outside, the supply fan 122 is stopped, thus enabling energy-saving control and suppressing the intrusion of humid outside air from the outdoors.

[0048] Next, we will explain in detail the control of the supply air fan 122, which differs from that shown in Figure 3, with reference to Figure 4. Figure 4 is a flowchart showing the control of supply air to the ceiling space 16 based on humidity differences. Note that explanations for steps that are the same as those in Figure 3 will be omitted.

[0049] If the humidity of the air in the attic 16 is below a predetermined threshold (S102:NO), the outdoor humidity acquisition unit 464 in Figure 4 acquires the humidity of the outdoor air detected by the outdoor humidity sensor 454 (S201).

[0050] Next, it is determined whether the humidity of the air in the attic 16 is higher than the humidity of the air outside (S202).

[0051] If the humidity of the air in the attic 16 is higher than the humidity of the outdoor air (S202:YES), the supply fan 122 is stopped (S203). Conversely, if the humidity of the air in the attic 16 is lower than the humidity of the outdoor air (S202:NO), the supply fan 122 is started (S204).

[0052] With this configuration, the operating and stopping states of the supply fan 122 can be appropriately switched based on the relationship between the humidity of the air in the attic 16 and the humidity of the outside air. When the humidity of the air in the attic 16 is lower than the humidity of the outside air, the supply fan 122 is activated, and conditioned air 210 is supplied to the attic 16, creating positive pressure in the attic 16 relative to the outside. Also, when the humidity of the air in the attic 16 is higher than the humidity of the outside air, the supply fan 122 is stopped, thus suppressing the intrusion of humid outside air from the outside with energy-saving control. Furthermore, unlike the control in Figure 3, the control parameters can be unified by humidity, making the control process simpler. (modified version) Next, a modified example of the configuration shown in Figure 1 will be described with reference to Figure 5. Figure 5 is a diagram showing a modified example of Figure 1. Figure 5 differs from Figure 1 in that a louver 510 is provided at the bottom of the living room 10 of the house 500. The louver 510 is a through-hole that allows ventilation between the living room 10 and the passageway 14. Here, the louver 510 corresponding to the first living room 10a will be called louver 510a, and the louver 510 corresponding to the second living room 10b will be called louver 510b.

[0053] In Figure 5, unlike in Figure 1, the supply fan 122 is positioned on the ceiling of the passageway 14. The supply fan 122 corresponding to the passageway 14 is referred to as the supply fan 122c. The supply fan 122c supplies air from the passageway 14 to the space above the ceiling 16. In Figure 5, the living room 10 and the passageway 14 are in ventilated communication via the louvers 510. Also, the passageway 14 and the space above the ceiling 16 are in ventilated communication via the supply fan 122c. Therefore, the living room 10, which is the area to be air-conditioned, and the space above the ceiling 16 are in ventilated communication. By operating the supply fan 122c in this state, the conditioned air 210 of the area to be air-conditioned can be supplied to the space above the ceiling 16 of the area to be air-conditioned.

[0054] In Figure 5, unlike in Figure 1, an air outlet for the conditioned air 210 is provided in the ceiling of the living room 10. The configuration includes an air supply fan 122c installed in the ceiling of passage 14. With this configuration, the conditioned air 210 transported to the living room 10 passes through the louvers 510 (louvers 510a and louvers 510b) and becomes an air passage supplied to the space above the ceiling 16. Since the louvers 510 are located at the bottom of the living room 10, the conditioned air 210 flows from the top to the bottom of the living room 10, ensuring that the living room 10 is properly air-conditioned. Furthermore, unlike in Figure 1, by installing only one air supply fan 122c in passage 14, the conditioned air 210 from all the living rooms 10 can be supplied to the space above the ceiling 16, thus reducing costs compared to installing an air supply fan 122 in each living room 10.

[0055] In the embodiments and modifications described herein, an air conditioning system 1000 that air-conditions the entire house 500 is described as an example, but the invention is not limited to this form. It is sufficient if the intrusion of humid outside air into the attic 16 is suppressed by creating a positive pressure in the attic 16 relative to the outside.

[0056] An overview of one aspect of this disclosure is as follows: (Item 1) An air conditioner (300) that provides air conditioning for an indoor area, The system includes an air supply fan (122) that supplies conditioned air (210) from the air-conditioned area to the ceiling space (16) of the air-conditioned area, The aforementioned intake fan (122) An air conditioning system (1000) that supplies conditioned air (210) to the space above the ceiling (16) such that the air pressure in the space above the ceiling (16) is higher than the air pressure outside. (Item 2) A differential pressure gauge (456) is provided to measure the differential pressure between the outdoor area and the ceiling space (16), The aforementioned intake fan (122) An air conditioning system (1000) that supplies conditioned air (210) to the ceiling space (16) of the area to be air-conditioned, based on the differential pressure measured by the differential pressure gauge (456), such that the air pressure in the ceiling space (16) becomes higher than the air pressure outside. (Item 3) The aforementioned intake fan (122) It operates when the air pressure in the space above the ceiling (16) is lower than the outdoor pressure. The air conditioning system (1000) according to claim 1, which stops when the air pressure in the space above the ceiling (16) is higher than the outdoor pressure. (Item 4) An outdoor humidity sensor (452) for detecting the humidity outdoors, The system includes a ceiling humidity sensor (454) for detecting the humidity in the ceiling space, The aforementioned intake fan (122) The system operates when the outdoor humidity detected by the outdoor humidity sensor (454) is higher than the humidity in the attic (16) detected by the attic humidity sensor (452). The air conditioning system (1000) according to claim 1, wherein the system stops when the outdoor humidity detected by the outdoor humidity sensor (454) is lower than the humidity in the attic (16) detected by the attic humidity sensor (452). (Item 5) The system includes a ceiling humidity sensor (452) for detecting the humidity in the ceiling space (16), The aforementioned intake fan (122) The air conditioning system (1000) according to claim 1, wherein if the humidity of the space above the ceiling (16) detected by the space above the ceiling humidity sensor (452) is above a predetermined threshold, the amount of conditioned air (210) supplied from the area to be air-conditioned to the space above the ceiling (16) is increased. (Item 6) The aforementioned air conditioner (300) It is located in an air conditioning room (18) that is separate from the area to be air-conditioned, The aforementioned air conditioning room (18) is The air conditioning system (1000) according to claim 1, further comprising a through hole (20) that allows ventilation to the space above the ceiling. [Explanation of Symbols]

[0057] 10 Room 10a 1st room 10b 2nd living room 14 aisles 16 Attic 18 Air conditioned room 20 Through holes 100 Outdoor air intake 102 Outdoor air intake duct 104 Ventilation system 120 Conveyor Fan 122, 122a, 122b, 122c Intake fan 130 Conveyor duct 140 branching chamber 142, 142a, 142b Branching transport duct 200 outside air 208 Air Intake 210 Air conditioning 300 Air Conditioning Units 310 Air conditioner 320 filters 330 cabinets 452 Ceiling humidity sensor 454 Outdoor Humidity Sensor 456 Differential pressure gauge 458, 458a, 458b Room temperature sensor 460 Controller 462 Attic humidity acquisition unit 464 Outdoor humidity acquisition section 466 Differential pressure acquisition unit 468 Air Intake Fan Control Unit 500 houses 510, 510a, 510b Louvers 1000 Air Conditioning Systems

Claims

1. An air conditioner that provides air conditioning for an indoor area, The system includes an air supply fan that supplies conditioned air from the air-conditioned area to the ceiling space of the air-conditioned area, The aforementioned intake fan is An air conditioning system that supplies conditioned air from the area to be air-conditioned into the ceiling space such that the air pressure in the ceiling space becomes higher than the air pressure outside.

2. A differential pressure gauge is provided to measure the differential pressure between the outdoor area and the ceiling space. The aforementioned intake fan is An air conditioning system that, based on the differential pressure measured by the differential pressure gauge, supplies conditioned air to the space above the ceiling so that the air pressure in the space above the ceiling becomes higher than the air pressure outside.

3. The aforementioned intake fan is It operates when the air pressure in the space above the ceiling is lower than the outdoor pressure. The air conditioning system according to claim 1, which stops when the air pressure in the space above the ceiling is higher than the outdoor pressure.

4. An outdoor humidity sensor for detecting the humidity outdoors, The system includes a ceiling humidity sensor for detecting the humidity in the ceiling space, The aforementioned intake fan is The system operates when the outdoor humidity detected by the outdoor humidity sensor is higher than the humidity in the attic detected by the attic humidity sensor. The air conditioning system according to claim 1, wherein the system stops when the outdoor humidity detected by the outdoor humidity sensor is lower than the humidity in the attic detected by the attic humidity sensor.

5. The system includes a ceiling humidity sensor that detects the humidity in the ceiling space, The aforementioned intake fan is The air conditioning system according to claim 1, wherein if the humidity in the ceiling space detected by the ceiling space humidity sensor is above a predetermined threshold, the amount of conditioned air supplied from the area to be air-conditioned to the ceiling space is increased.

6. The aforementioned air conditioner is, It is located in an air conditioning room separate from the aforementioned air conditioning target area, The aforementioned air conditioning room is The air conditioning system according to claim 1, further comprising a through hole that allows ventilation to communicate with the space above the ceiling.

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