Air conditioning system, air conditioning control method, and program

Abstract

To secure comfort of users living in a plurality of spaces above an underfloor space while sending air-conditioned air in the underfloor space to the spaces.SOLUTION: The air conditioning system includes an air conditioner configured to condition air in an underfloor space and send the air in the underfloor space to a first space, a discharge port formed in the first space and configured to discharge the air sent from the underfloor space to the first space, a supply port formed in a second space and configured to supply the air to the second space, a guide passage configured to connect the discharge port and the supply port and to guide the air discharged from the discharge port to the supply port, and a heat exchanger configured to exchange heat between air flowing through the first communication passage and air flowing through the second communication passage.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to technology for air conditioning buildings. [Background technology]

[0002] Conventionally, there is known a technology for sending air conditioned by an air conditioner from an underfloor space of a building to multiple spaces above the floor of the building. For example, Patent Document 1 discloses an underfloor air conditioning system constructed in a building having an underfloor space and an above-floor space. This system includes an air conditioner that draws in air from the above-floor space, heats it, and then discharges it into the underfloor space; a blower installed in the underfloor space that blows only the air from the underfloor space; and an air duct that connects the above-floor space with the underfloor space. The above-floor space of the building includes a first floor and a second floor. In this air conditioning system, air is drawn in from the first and second floors, heated in the underfloor space, and then sent back to the first and second floors. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-076789 Summary of the Invention [Problem to be solved by the invention]

[0004] In the underfloor air conditioning system described in Patent Document 1, there is a risk that contaminated air will be dispersed into the space above the floor. Specifically, in the above system, air drawn in from the first and second floors temporarily joins in the underfloor space, is heated, and then sent back to the first and second floors. Therefore, for example, if the air on the first floor is contaminated, this contaminated air may join with uncontaminated air on the second floor in the underfloor space, resulting in contaminated air being sent to the second floor. In this case, the comfort of users living on the second floor will be reduced.

[0005] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a technology that can send conditioned air from the underfloor space to multiple spaces above the underfloor space while ensuring the comfort of users residing in these spaces. [Means for solving the problem]

[0006] an air conditioning system according to a first aspect of the present invention, which is constructed in a building having an underfloor space, a first space located above the underfloor space, and a second space located above the first space, and which comprises: an air conditioning unit that conditions the air in the underfloor space and sends the air from the underfloor space to the first space; an exhaust outlet formed in the first space and discharging air sent from the underfloor space to the first space; a supply outlet formed in the second space and supplying air to the second space; a guide path that connects the exhaust outlet and the supply outlet and guides the air discharged from the exhaust outlet to the supply outlet; a first communication passage that branches off from the guide path and connects the guide path to an outdoor space outside the building; a second communication passage that connects a downstream portion of the guide path downstream of the branch point of the first communication passage with the outdoor space; and a heat exchanger connected to the first communication passage and the second communication passage and performing heat exchange between the air flowing through the first communication passage and the air flowing through the second communication passage.

[0007] According to this configuration, heat-exchanged outside air can be merged with air sent from the first floor space to the second floor space. Specifically, in the above configuration, the exhaust port of the first space and the supply port of the second space are connected by a guide path, so that air from the first space flows to the second space through the guide path. Here, the above air conditioning system includes a first communication path branching off from the guide path and connecting the guide path to the outdoor space, a second communication path connecting a downstream portion of the guide path downstream of the branch point of the first communication path with the outdoor space, and a heat exchanger connected to both communication paths. This allows heat exchange to occur between the air flowing from the guide path to the first communication path and the outside air flowing from the outdoor space to the second communication path. Furthermore, air that flows from the guide path to the downstream portion of the guide path without flowing into the first communication path can be merged with the heat-exchanged air flowing through the second communication path. That is, heat-exchanged outside air can be merged with air sent from the first floor space to the second floor space. As a result, the level of pollution of the air sent from the first floor space to the second floor space is reduced. Also, large fluctuations in the temperature of this air can be suppressed. As a result, the conditioned air in the underfloor space can be sent to the first and second spaces located above the underfloor space, while ensuring the comfort of the users living in these spaces.

[0008] The air conditioning system according to a second aspect of the present invention may further include, in the first aspect, a blower arranged in the downstream portion and generating an airflow that guides air from the first space to the downstream portion, and a control device that controls the operation of the blower to match a first air volume of air flowing from the guide path to the first communication passage and passing through the heat exchanger with a second air volume of air flowing from the outdoor space to the second communication passage and passing through the heat exchanger.

[0009] With this configuration, the first air volume of air flowing from the guide path to the first communication passage and passing through the heat exchanger matches the second air volume of air flowing from the outdoor space to the second communication passage and passing through the heat exchanger, thereby improving the heat exchange efficiency in the heat exchanger compared to when the first air volume and the second air volume do not match.

[0010] In the air conditioning system according to the third aspect of the present invention, in the second aspect, the control device may acquire first information indicating the required ventilation volume of the first space and second information indicating the required ventilation volume of the second space, and calculate a third air volume of the airflow generated by the blower based on the first information and the second information.

[0011] According to this configuration, the third airflow rate is calculated based on the first information indicating the required ventilation rate for the first space and the second information indicating the required ventilation rate for the second space. By operating the fan based on this third airflow rate, the first airflow rate and the second airflow rate can be accurately matched.

[0012] An air conditioning system according to a fourth aspect of the present invention may be configured such that, in the third aspect, when the required ventilation volume of the first space is greater than the required ventilation volume of the second space, the control device calculates the third air volume based on the difference between the required ventilation volume of the first space and the required ventilation volume of the second space.

[0013] With this configuration, when the required ventilation volume for the first space is greater than the required ventilation volume for the second space, the third airflow rate is calculated, and the fan operates based on this third airflow rate, thereby making it possible to accurately match the first airflow rate and the second airflow rate.

[0014] An air conditioning system according to a fifth aspect of the present invention is any one of the second to fourth aspects, wherein the control device stops the blower when the required ventilation volume of the first space is equal to or less than the required ventilation volume of the second space.

[0015] According to this configuration, when the ventilation volume required for the first space is equal to or less than the ventilation volume required for the second space, the blower stops, so that the first air volume and the second air volume can be made to match accurately.

[0016] An air conditioning system according to a sixth aspect of the present invention may be configured such that, in the second aspect, when the air conditioning device is operating, the control device acquires second information indicating the required ventilation volume of the second space, acquires a fourth airflow volume of air sent from the air conditioning device to the first space, and calculates a third airflow volume of the airflow generated by the blower based on the difference between the required ventilation volume of the second space and the fourth airflow volume.

[0017] With this configuration, when the air conditioning device is operating, the third airflow rate is calculated based on the difference between the required ventilation rate for the second space and the fourth airflow rate, so the third airflow rate can be accurately calculated. By operating the fan based on this third airflow rate, the first airflow rate and the second airflow rate can be accurately matched.

[0018] An air conditioning control method according to a seventh aspect of the present invention is an air conditioning control method executed by a control device in an air conditioning system constructed in a building having an underfloor space, a first space located above the underfloor space, and a second space located above the first space, the air conditioning system comprising an air conditioner that conditions the air in the underfloor space and sends air from the underfloor space to the first space, an outlet formed in the first space and that discharges air sent from the underfloor space to the first space, a supply outlet formed in the second space and that supplies air to the second space, a guide path that connects the outlet and the supply port and guides the air discharged from the outlet to the supply port, and a guide path that branches off from the guide path and connects the guide path to an outdoor space outside the building. the air conditioning device is equipped with a first communication passage that connects the outdoor space to the first space, a second communication passage that connects the outdoor space to a downstream portion of the guide path downstream of the branch point of the first communication passage, a heat exchanger that is connected to the first communication passage and the second communication passage and that performs heat exchange between the air flowing through the first communication passage and the air flowing through the second communication passage, and a blower that is arranged in the downstream portion and generates an airflow that guides the air of the first space to the downstream portion, and the control device acquires first information that indicates the required ventilation volume of the first space, acquires second information that indicates the required ventilation volume of the second space, and acquires third information that indicates the operating status of the air conditioning device, and controls the operation of the blower based on the first information, the second information, and the third information.

[0019] According to this air conditioning control method, the operation of the blower is controlled based on the first information, the second information, and the third information. This allows the volume of air guided to the downstream portion of the guide path by the airflow generated by the blower to be controlled. As a result, the volume of air flowing from the guide path to the first communication path and passing through the first heat exchanger is adjusted. This makes it possible to match the volume of air flowing through the first communication path and passing through the first heat exchanger with the volume of air flowing from the outdoor space to the second communication path and passing through the first heat exchanger.

[0020] A program according to an eighth aspect of the present invention is a program for causing a control device to execute processing in an air conditioning system constructed in a building having an underfloor space, a first space located above the underfloor space, and a second space located above the first space, the air conditioning system including an air conditioner that conditions the air in the underfloor space and sends air from the underfloor space to the first space, an exhaust port formed in the first space and that discharges air sent from the underfloor space to the first space, a supply port formed in the second space and that supplies air to the second space, a guide path that connects the exhaust port and the supply port and guides the air discharged from the exhaust port to the supply port, and a guide path that branches off from the guide path and connects the guide path to an outdoor space outside the building. the control device is provided with: a first communication passage that passes air through the first space; a second communication passage that connects a downstream portion of the guide path downstream of the branch point of the first communication passage with the outdoor space; a heat exchanger that is connected to the first communication passage and the second communication passage and performs heat exchange between the air flowing through the first communication passage and the air flowing through the second communication passage; and a blower that is arranged in the downstream portion and generates an airflow that guides the air of the first space to the downstream portion, and by executing the program, the control device obtains first information that indicates the required ventilation volume of the first space, obtains second information that indicates the required ventilation volume of the second space, and obtains third information that indicates the operating status of the air conditioning device, and controls the operation of the blower based on the first information, the second information, and the third information.

[0021] This program can provide the same effects as the above-described air conditioning control method. [Effects of the Invention]

[0022] According to the present invention, conditioned air in the underfloor space can be sent to multiple spaces located above the underfloor space, while ensuring the comfort of users residing in these spaces. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a diagram showing the configuration of a building in which an air conditioning system according to a first embodiment is installed. [Figure 2] FIG. 1 is a diagram schematically illustrating air flow in a building in which an air conditioning system is installed. [Figure 3] FIG. 10 is a diagram schematically illustrating the configuration of an air conditioning system according to a second embodiment. [Figure 4] FIG. 2 is a diagram showing a simplified configuration of a control device. [Figure 5] FIG. 2 is a diagram showing a simplified configuration of a processing unit. [Figure 6] 10 is a flowchart showing the flow of processing executed by a processing unit. [Figure 7] 10 is a flowchart showing a process for controlling the operation of a blower. [Figure 8] FIG. 10 is a diagram showing the air flow in a building when the air conditioning device is stopped and the first required ventilation volume is greater than the second required ventilation volume. [Figure 9] FIG. 10 is a diagram showing the air flow in a building when the air conditioning device is stopped and the first required ventilation volume is equal to or less than the second required ventilation volume. [Figure 10] 10 is a flowchart showing the flow of processing executed by a processing unit when the air conditioning apparatus is operating. [Figure 11] FIG. 1 is a diagram showing the air flow in a building when an air conditioning device is operating. [Figure 12] 10 is a flowchart showing the flow of a process for determining a fourth air volume. [Figure 13]FIG. 10 is a diagram showing airflow in a building according to a modified example of the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0024] An air conditioning system according to the present invention will be described below. Each of the embodiments described below represents a specific example of the present invention. The numerical values, shapes, components, steps, and order of steps shown in the following embodiments are merely examples and are not intended to limit the present invention. Furthermore, among the components in the following embodiments, components that are not described in the independent claims that represent the highest concept will be described as optional components. Furthermore, in all of the embodiments, the respective contents can be combined. Note that elements with the same reference numerals in different drawings represent the same or corresponding elements.

[0025] (Embodiment 1) Fig. 1 is a diagram showing the configuration of a building 100 in which an air conditioning system 1 according to a first embodiment of the present invention is constructed. As shown in Fig. 1, the building 100 includes an underfloor space SP0, a first floor space SP1 (an example of a first space), a second floor space SP2 (an example of a second space), an inter-floor space SP3, and an attic space SP4.

[0026] The underfloor space SP0 is a space formed below the first floor 101 of the building 100.

[0027] The first floor space SP1 is a space located above the first floor 101. The first floor space SP1 includes a first room R1, which is a living room, and a first floor staircase space T1, which is a non-living room. The first floor staircase space T1 includes a storage space U. The storage space U is formed inside a storage area such as a washroom or a closet.

[0028] The second floor space SP2 is a space located above the first floor space SP1. The second floor space SP2 includes a second room R2 and a third room R3, which are adjacent living rooms separated by a wall 106, and a second floor staircase space T2, which is a non-living room that communicates with the first floor staircase space T1.

[0029] The inter-floor space SP3 is a space formed between the first floor space SP1 and the second floor space SP2 in the vertical direction.

[0030] The attic space SP4 is a space formed between the roof 112 of the building 100 and the second floor space SP2 in the vertical direction.

[0031] The air conditioning system 1 includes an air conditioning unit 10, a plurality of first air vents 11, a plurality of exhaust ports 12, a guide path 13, a first communication passage 14, a second communication passage 15, a first heat exchanger 16, a plurality of supply ports 17, a second air vent 18, a third communication passage 19, a fourth communication passage 20, a third air vent 21, a second heat exchanger 22, an air purifier 23, ventilation equipment 24, and an auxiliary air conditioning unit 25.

[0032] The air conditioning device 10 conditions the air in the underfloor space SP0 by, for example, performing cooling or heating operation, and sends the air in the underfloor space SP0 to the first floor space SP1. The air conditioning device 10 has an indoor unit placed in the storage space U, and an outdoor unit (not shown) connected to the indoor unit and placed in the outdoor space OS.

[0033] The plurality of first ventilation openings 11 are formed on the first floor 101 of the building 100, respectively, and allow air in the underfloor space SP0 to flow into the first floor space SP1.

[0034] The plurality of exhaust ports 12 are formed in the first floor ceiling 102 of the building 100, respectively, and exhaust air that has flowed from the underfloor space SP0 to the first floor space SP1.

[0035] The guide path 13 is a duct that connects the multiple exhaust ports 12 and the multiple supply ports 17 and guides air discharged from the multiple exhaust ports 12 to the multiple supply ports 17. The guide path 13 has a first portion 131, a second portion 132 (an example of a downstream portion), a third portion 133, a branching portion 134, and a merging portion 135. The first portion 131 is disposed in the inter-floor space SP3 and connects each of the multiple exhaust ports 12 to the branching portion 134. The branching portion 134 is a portion where the first communication passage 14 branches off from the guide path 13. The branching portion 134 is disposed in the inter-floor space SP3. The second portion 132 is located downstream of the branching portion 134 and upstream of the merging portion 135 in the air flow direction from the first floor space SP1 to the second floor space SP2. In other words, the second portion 132 is a portion that connects the branching portion 134 and the merging portion 135. The second portion 132 is arranged across the inter-floor space SP3, the inside of the wall 106 of the second-floor space SP2, and the attic space SP4. The junction 135 is the portion where the second communication passage 15 and the guide path 13 are connected. As will be described in detail later, the air flowing through the second communication passage 15 merges with the air flowing through the guide path 13 at the junction 135. The junction 135 is arranged in the inter-floor space SP3. The third portion 133 is located downstream of the junction 135 in the air flow direction from the first-floor space SP1 to the second-floor space SP2, and is a portion that connects the junction 135 with each of the multiple supply ports 17. The third portion 133 is arranged in the attic space SP4.

[0036] The first communication passage 14 is a duct that branches off from the branch point 134 of the guide passage 13 and connects the guide passage 13 to the outdoor space OS outside the building 100. The first communication passage 14 is arranged across the inter-floor space SP3, the inside of the wall 106 of the second-floor space SP2, and the attic space SP4.

[0037] The second communication passage 15 is a duct that connects the outdoor space OS to a second portion 132 of the guide path 13 that is downstream of the branch point 134 of the first communication passage 14. The second communication passage 15 is disposed in the attic space SP4.

[0038] The first heat exchanger 16 is connected to each of the first communication passage 14 and the second communication passage 15, and performs heat exchange between the air flowing through the first communication passage 14 and the air flowing through the second communication passage 15.

[0039] A plurality of supply ports 17 are formed in the ceilings 107, 108 of the second room R2 and the third room R3, respectively, and supply air that has passed through the guide path 13 to the second room R2 and the third room R3 of the second floor space SP2. Note that the supply ports 17 do not necessarily have to be formed in the ceilings 107, 108, but may also be formed in the floor 109 of the second room R2, the floor 110 of the third room R3, the wall 106, or the like.

[0040] The second ventilation port 18 is formed in the ceiling 111 of the second floor stair space T2 and allows air in the second floor stair space T2 to flow to the third communication passage 19.

[0041] The third communication passage 19 is a duct that extends from the second vent 18 to the outdoor space OS and connects the second floor space SP2 to the outdoor space OS. The third communication passage 19 is arranged across the attic space SP4, the inside of the wall 106 of the second floor space SP2, and the inter-floor space SP3.

[0042] The fourth communication passage 20 extends from the third vent port 21 to the outdoor space OS, and connects the first floor space SP1 and the outdoor space OS. The fourth communication passage 20 is disposed in the inter-floor space SP3.

[0043] The third ventilation port 21 is formed in the ceiling of the first floor staircase space T1 and allows air from the outdoor space OS to pass through the fourth communication passage 20 and flow into the first floor space SP1.

[0044] The second heat exchanger 22 is connected to the third communication passage 19 and the fourth communication passage 20, and performs heat exchange between the air flowing through the third communication passage 19 and the air flowing through the fourth communication passage 20.

[0045] The air purifier 23 has a casing placed in the second portion 132 of the guide path 13, and a filter and a blower 230 installed inside the casing. The filter captures floating particles such as dust contained in the air passing through the second portion 132 of the guide path 13. The blower 230 generates an airflow that guides the air from the first room R1 to the second portion 132 of the guide path 13. The operation of the blower 230 will be described in the second embodiment. The air purifier 23 is preferably installed in a location that allows maintenance to be performed from a hallway (not shown) or a storage area in the second floor space SP2.

[0046] The ventilation equipment 24 is equipment for realizing 24-hour ventilation in the building 100 and includes a first exhaust device 241, a first air supply device 242, a second exhaust device 243, and a second air supply device 244. The first exhaust device 241 is disposed in the first communication passage 14 and guides air flowing through the first portion 131 of the guide path 13 to the first communication passage 14, and generates an airflow that passes through the first heat exchanger 16 and is sent to the outdoor space OS. The first air supply device 242 is disposed in the second communication passage 15 and guides air from the outdoor space OS to the second communication passage 15 and generates an airflow that passes through the first heat exchanger 16 and is sent to the junction 135 of the guide path 13. The second exhaust device 243 is disposed in the third communication passage 19 and guides air from the second floor stair space T2 to the third communication passage 19, and generates an airflow that passes through the second heat exchanger 22 and is sent to the outdoor space OS. The second air supply device 244 is disposed in the fourth communication passage 20, and generates an airflow that guides the air in the outdoor space OS into the fourth communication passage 20 and passes through the second heat exchanger 22 to be sent to the first floor stair space T1.

[0047] The auxiliary air conditioning unit 25 is used to adjust the room temperatures of the second room R2 and the third room R3 according to the preferences of the users residing in those rooms. The auxiliary air conditioning unit 25 according to the first embodiment is, for example, a floor heating unit or a floor cooling unit placed in the inter-floor space SP3. With this configuration, the floor heating and cooling unit can be used without the risk of condensation, compared to when the floor heating and cooling unit is placed in the underfloor space SP0. The auxiliary air conditioning unit 25 may also be configured, for example, by an air conditioning unit 10 having a so-called wall-mounted indoor unit and an outdoor unit connected to the indoor unit and placed in the outdoor space OS.

[0048] FIG. 2 is a diagram schematically illustrating how air flows in the building 100. Starting from under the floor, the air in the underfloor space SP0 that has been conditioned by the air conditioning device 10 first flows into the first room R1 through the multiple first air vents 11. In the first room R1, the air flows into the first portion 131 of the guide path 13 through the multiple exhaust ports 12 and reaches the branching point 134. Here, some of the air flows from the branching point 134 into the first communication path 14, and the remaining air flows into the second portion 132 of the guide path 13. The air that flows from the branching point 134 into the first communication path 14 flows into the first heat exchanger 16, where it is used for heat exchange with the air (outside air) flowing through the second communication path 15, and is then released into the outdoor space OS. Meanwhile, the remaining air that flows from the branching section 134 to the second section 132 of the guide section reaches the confluence section 135 and merges with the air in the second communication passage 15 that has passed through the first heat exchanger 16. This merged air then branches again at the confluence section 135 and flows into the third section 133 of the guide passage 13, passing through each of the supply ports 17 and reaching the second room R2 and the third room R3. The air that flows into the second room R2 passes through the undercut of the second door 104 of the second room R2 and reaches the second-floor staircase space T2. Similarly, the air that flows into the third room R3 passes through the undercut of the third door 105 of the third room R3 and reaches the second-floor staircase space T2. The air in the second-floor staircase space T2 then flows into the third communication passage 19 through the second ventilation opening 18. Note that some of the air in the second-floor staircase space T2 may flow into the first-floor staircase space T1 due to a pressure difference. Details will be described in the second embodiment. The air that flows from the second floor stair space T2 into the third communication passage 19 passes through the second heat exchanger 22 and is released into the outdoor space OS. At this time, the air in the outdoor space OS (outside air) flows into the fourth communication passage 20, passes through the second heat exchanger 22, exchanges heat with the air flowing through the third communication passage 19, and is sent to the first floor stair space T1 through the third air vent 21. The air sent to the first floor stair space T1 is then taken in by the air conditioning unit 10 and conditioned, and then sent again to the first room R1 via the underfloor space SP0.

[0049] In the air conditioning system 1 having the above configuration, the air taken in from the outdoor space OS into the second communication passage 15 and the air flowing through the second portion 132 of the guide path 13 merge at the junction 135 of the guide path 13. That is, outside air merges with the air as it is sent from the first floor space SP1 to the second floor space SP2 through the guide path 13. In this way, air whose level of pollution has been reduced by taking in outside air can be supplied to the second floor space SP2 (the second room R2 and the third room R3). Therefore, even if a bad odor is generated in the first floor space SP1 (the first room R1), for example, air with a reduced bad odor can be sent to the second floor space SP2 by taking in outside air. Furthermore, air with a reduced carbon dioxide concentration can be sent to the second floor space SP2.

[0050] Furthermore, with the above configuration, it is possible to merge air that has undergone heat exchange with the air flowing through the guide path 13. In other words, it is possible to merge air that flows through the second communication path 15 and that has received or given heat from the air flowing through the first communication path 14 when passing through the first heat exchanger 16. This prevents large fluctuations in the temperature of the air after merging when the above air merges with the air flowing through the guide path 13 at the merging section 135.

[0051] As described above, the air conditioning system 1 according to the first embodiment can take in fresh outside air and send air with relatively suppressed temperature fluctuations to the second room R2 and the third room R3. As a result, the comfort of the users residing in the first room R1, the second room R2, and the third room R3 is ensured while the conditioned air in the underfloor space SP0 is sent to the first room R1, the second room R2, and the third room R3. In particular, the comfort of the users residing in the second room R2 and the third room R3 is ensured.

[0052] In this way, according to the air conditioning system 1 of embodiment 1, air that has undergone heat exchange merges with the air flowing through the guide path 13, and therefore, the temperature fluctuations of the air after the merger can be suppressed from becoming large compared to when air that has not undergone heat exchange merges.

[0053] From the perspective of sending outside air to the second-floor space SP2, it is also possible to configure the system so that the air flowing through the guide path 13 and the air flowing through the second communication path 15 after passing through the first heat exchanger 16 do not merge. Specifically, it is also possible to configure the system so that the second portion 132 is removed from the guide path 13 shown in FIG. 1. In this case, all of the air flowing through the first portion 131 of the guide path 13 flows into the first communication path 14 and is sent to the first heat exchanger 16. Then, the air in the second communication path 15 that has exchanged heat with the air flowing through the first communication path 14 reaches the third portion 133 of the guide path 13 and flows into the second room R2 and the third room R3.

[0054] However, this configuration may result in large temperature fluctuations. For example, if the heat exchange efficiency of the first heat exchanger 16 is 80%, the outside air temperature is 0°C, and the temperature of the air supplied from the underfloor space SP0 to the first room R1, i.e., the temperature of the air flowing through the first communication passage 14, is 20°C, the temperature of the air flowing through the second communication passage 15 and passing through the first heat exchanger 16 is expressed as "(20°C - 0°C) x 80%." That is, the temperature of the air after passing through the first heat exchanger 16 is 16°C. Then, this 16°C air passes through the third portion 133 of the guide path 13 and flows into the second room R2 and the third room R3.

[0055] In contrast, in the air conditioning system 1 according to the first embodiment, the air flowing through the guide path 13 and the air flowing through the second communication path 15 after passing through the first heat exchanger 16 merge, so that air with suppressed temperature fluctuations can be sent to the second room R2 and the third room R3. Specifically, as described above, if the heat exchange efficiency of the first heat exchanger 16 is 80%, the outside air temperature is 0°C, and the temperature of the air flowing through the first communication path 14 is 20°C, the temperature of the air flowing through the second communication path 15 and passing through the first heat exchanger 16 is expressed as "(20°C - 0°C) x 80%." That is, it is 16°C. Furthermore, if the ratio of the air flowing through the second portion 132 of the guide path 13 to the junction 135 and the air flowing through the second communication path 15 to the junction 135 is equal to the ratio of the air flowing through the second communication path 15 to the junction 135 after passing through the first heat exchanger 16, the temperature of the air after junction is expressed as "(16°C + 20°C) / 2." That is, the temperature of the air after merging is 18°C. Then, this 18°C ​​air flows into the second room R2 and the third room R3. As described above, according to the air conditioning system 1 of the first embodiment, air with reduced temperature fluctuations can be sent to the second room R2 and the third room R3 compared to when the air flowing through the guide path 13 and the air flowing through the second communication path 15 after passing through the first heat exchanger 16 are not merged. This makes it possible to more reliably ensure the comfort of the users residing in the second room R2 and the third room R3.

[0056] Furthermore, according to the air conditioning system 1 of embodiment 1, the air purifier 23 is disposed in the second portion 132 of the guide path 13, so that air with a lower level of pollution can be sent to the second floor space SP2. Moreover, because the air purifier 23 is disposed in the second portion 132, it does not take up as much space in each room as would be the case if a so-called floor-standing air purifier 23 were installed in each room. Moreover, compared to a case in which a so-called ceiling-embedded air purifier 23 were installed in each room, the interior appearance is not marred and maintenance is easier.

[0057] Furthermore, because the air conditioning system 1 according to the first embodiment is equipped with the auxiliary air conditioning unit 25, the room temperatures of the second room R2 and the third room R3 can be adjusted according to the preferences of the users residing in each room. This room temperature adjustment in the second room R2 and the third room R3 is performed using air that has been conditioned to some extent by air supplied from the first floor space SP1S1, thereby reducing energy consumption.

[0058] Furthermore, the air conditioning system 1 of embodiment 1 is equipped with a third communication passage 19, a second heat exchanger 22, and a fourth communication passage 20, which allows heat exchange to occur between the air released into the outdoor space OS through the third communication passage 19 and the air sent from the outdoor space OS to the first floor space SP1 through the fourth communication passage 20, thereby making effective use of the heat released into the outdoor space OS from the third communication passage 19.

[0059] Furthermore, in the air conditioning system 1 according to the first embodiment, the second communication passage 15 merges with the guide passage 13 at the junction 135, so that the post-heat-exchange outside air flowing through the second communication passage 15 and the air flowing through the second section 132 are mixed at the junction 135 and the third section 133. In other words, the air flowing through the guide passage 13 and the post-heat-exchange outside air are mixed before being supplied to the second-floor space SP2. In this way, in the air conditioning system 1, the post-heat-exchange outside air flowing through the second communication passage 15 is prevented from being directly supplied to the second room R2 and the third room R3, so that user comfort can be more reliably ensured.

[0060] The following describes various modifications to the above-described embodiment 1. These modifications can be applied in any combination.

[0061] (Variation 1) When the air conditioning apparatus 10 performs cooling operation, the cold air sent to the first room R1 from the first air vent 11 may stagnate near the first floor 101 due to the characteristics of the air. Therefore, the air conditioning system 1 may further include a negative pressure generating device that sets the first room R1 at a negative pressure relative to the underfloor space SP0 by generating an airflow that guides the air in the first room R1 into the guide path 13. In this way, the cold air sent to the first room R1 is encouraged to rise up to the first floor ceiling 102 and reach the guide path 13, thereby preventing the cold air from stagnating near the first floor 101.

[0062] The negative pressure generating device is preferably placed at a position away from the air conditioning device 10. For example, the negative pressure generating device is preferably placed near the outlet 12 that is farthest from the air conditioning device 10 (the outlet 12 on the right side in FIG. 1). In this way, the air in the underfloor space SP0 can be guided to the outlet 12 that is farthest from the air conditioning device 10. As a result, the air in the underfloor space SP0 is diffused evenly throughout the first room R1, thereby preventing uneven temperature distribution in the first room R1.

[0063] Note that multiple negative pressure generating devices may be installed. In this case, the same effect as described above can be obtained by making the air volume of the negative pressure generating device installed at a position farther away from the air conditioning device 10 larger than the air volume of the negative pressure generating device installed at a position closer to the air conditioning device 10.

[0064] Furthermore, according to the configuration of this modified example, the first room R1 is at a negative pressure relative to the underfloor space SP0, which prevents the air in the underfloor space SP0 from entering the interior of the walls (not shown) of the first floor space SP1, and also ensures that the air in the underfloor space SP0 is guided reliably to the first room R1.

[0065] (Embodiment 2) An explanation will be given of an air conditioning system 1A according to embodiment 2. In embodiment 2, the same components as those in embodiment 1 are given the same reference numerals, and explanations thereof will be omitted.

[0066] Fig. 3 is a block diagram showing the electrical configuration of an air conditioning system 1A according to embodiment 2. As shown in Fig. 3, the air conditioning system 1A further includes a control device 30 connected to the air conditioner 10 and the air purifier 23 via a communication network NW. The communication network NW is, for example, a local area network.

[0067] FIG. 4 is a diagram showing a simplified configuration of the control device 30. The control device 30 controls the operation of the blower 230 of the air purifier 23 to match a first air volume of air flowing from the guide path 13 to the first communication passage 14 and passing through the first heat exchanger 16 with a second air volume of air flowing from the outdoor space OS to the second communication passage 15 and passing through the first heat exchanger 16. The control device 30 is configured by an operation panel installed on, for example, a wall of the building 100. However, the control device 30 may also be configured by an information terminal such as a PC, tablet, or smartphone. The control device 30 has an input unit 31, a communication unit 32, a memory unit 34, and a processing unit 33, which are interconnected via a bus.

[0068] The input unit 31 includes switches that allow the user to manually perform various operations such as starting or stopping the air conditioning apparatus 10.

[0069] The communication unit 32 includes a communication module that transmits and receives information such as data or commands to and from other devices via the communication network NW.

[0070] The storage unit 34 is configured with any recording medium such as an HDD, SSD, or semiconductor memory. As shown in FIG. 4, the storage unit 34 stores first information D1, second information D2, and a program 35. The first information D1 is information indicating the required ventilation rate for the first-floor space SP1. The required ventilation rate refers to the ventilation rate required in a building as stipulated by laws and regulations (such as the Building Standards Act) and guidelines. The second information D2 is information indicating the required ventilation rate for the second-floor space SP2. The program 35 is loaded by the processing unit 33. The program 35 is stored on a computer-readable recording medium, such as a CD-ROM, and provided to the user. The user installs the program 35 in the storage unit 34 by loading the recording medium into the control device 30. The program 35 may also be stored on a server on the Internet. In this case, the user may operate the control device 30 to install the program 35 from the server into the storage unit 34.

[0071] The processing unit 33 is configured to include a processor such as a CPU. Fig. 5 is a simplified diagram showing the functions of the processing unit 33. The processor executes the program 35 read from the storage unit 34, causing the processing unit 33 to function as an air conditioning control unit 331, an acquisition unit 332, and a control unit 333. In other words, the program 35 is a program for causing a processor such as a CPU mounted in the control device 30 to function as the air conditioning control unit 331, the acquisition unit 332, and the control unit 333.

[0072] The air conditioning control unit 331 controls the air volume and blow-out temperature of the air conditioner 10 by sending and receiving various signals to and from the air conditioner 10 via the communication unit 32. Hereinafter, the air volume of the air conditioner 10 will be referred to as the air conditioner air volume (an example of a fourth air volume). A method for determining the air conditioner air volume will be described later.

[0073] The acquisition unit 332 acquires the first information D1 and the second information D2 from the recording unit. The acquisition unit 332 also communicates with the air conditioning control unit 331 to acquire third information D3 indicating the operating status of the air conditioning apparatus 10.

[0074] The control unit 333 controls the operation of the blower 230 based on the first information D1, second information D2, and third information D3 acquired by the acquisition unit 332. Specifically, the control unit 333 references the third information D3 to determine whether the air conditioning apparatus 10 is operating. If the air conditioning apparatus 10 is not operating, the control unit 333 calculates a blower airflow (an example of a third airflow), which is the airflow of the airflow generated by the blower 230, based on the first information D1 and the second information D2. On the other hand, if the air conditioning apparatus 10 is operating, the control unit 333 calculates the blower airflow based on the difference between the required ventilation volume of the second-floor space SP2 and the air conditioner airflow. By controlling the operation of the blower 230 based on the calculated blower airflow, the first airflow of air flowing from the guide path 13 to the first communication passage 14 and passing through the heat exchanger is matched with the second airflow of air flowing from the outdoor space OS to the second communication passage 15 and passing through the heat exchanger.

[0075] Fig. 6 is a flowchart showing the flow of processing executed by the processing unit 33 according to embodiment 2. The processing shown in Fig. 6 is performed at a predetermined cycle. For example, it is performed at a cycle that realizes a ventilation volume of 0.5 times / h.

[0076] First, in step ST1, the acquisition unit 332 acquires first information D1 indicating the required ventilation rate for the first floor space SP1 (hereinafter referred to as the first required ventilation rate) from the storage unit 34. The first required ventilation rate may be calculated based on the volume of the first floor space SP1, etc. After acquiring the first information D1, the acquisition unit 332 inputs the first information D1 to the control unit 333.

[0077] In step ST2, the acquisition unit 332 acquires second information D2 indicating the ventilation requirement for the second-floor space SP2 (hereinafter referred to as the second ventilation requirement) from the memory unit 34. As with the first ventilation requirement, the second ventilation requirement may be calculated based on the volume of the second-floor space SP2, etc. Having acquired the second information D2, the acquisition unit 332 inputs the second information D2 to the control unit 333.

[0078] In step ST3, the acquisition unit 332 acquires third information D3 indicating whether the air conditioning apparatus 10 is operating from the air conditioning control unit 331. Having acquired the third information D3, the acquisition unit 332 inputs the third information D3 to the control unit 333.

[0079] In step ST4, the control unit 333 controls the operation of the blower 230 based on the first information D1 to the third information D3. Specifically, the control unit 333 controls the operation of the blower 230 to match the first air volume of the air flowing from the guide path 13 to the first communication passage 14 and passing through the first heat exchanger 16 with the second air volume of the air flowing from the outdoor space OS to the second communication passage 15 and passing through the first heat exchanger 16.

[0080] 7 is a flowchart showing the flow of processing for controlling the operation of the fan 230. That is, the flowchart shows the flow of processing in step ST4 of FIG.

[0081] In step ST11, the control unit 333 determines whether or not the air conditioning apparatus 10 is operating, based on the third information D3.

[0082] If the air conditioning apparatus 10 is operating (YES in step ST11), the control unit 333 executes the processing shown in step ST21 in Fig. 10. This processing will be described later.

[0083] If the air conditioning device 10 is not operating (NO in step ST11), then in step ST12, the control unit 333 determines whether the first required ventilation volume is greater than the second required ventilation volume based on the first information D1 and the second information D2.

[0084] If the first required ventilation rate is greater than the second required ventilation rate (YES in step ST12), then in step ST13, the control unit 333 calculates the blower airflow rate. Specifically, the control unit 333 calculates the blower airflow rate of the airflow generated by the blower 230 based on the difference between the first required ventilation rate and the second required ventilation rate. For example, if the first required ventilation rate is 100 m3 / h and the second required ventilation rate is 80 m3 / h, the control unit 333 calculates "100 m3 / h - 80 m3 / h" to determine that the blower airflow rate is 20 m3 / h.

[0085] In step ST14, the control unit 333 operates the blower 230 based on the above-mentioned blower air volume. For example, the control unit 333 operates the blower 230 to generate an airflow that guides air at a volume of 20 m / h to the second portion 132.

[0086] In step ST15, the control unit 333 starts the ventilation equipment 24. Specifically, the control unit 333 starts the first exhaust device 241, the first air supply device 242, the second exhaust device 243, and the second air supply device 244 to perform ventilation that satisfies the first required ventilation rate (e.g., 100 m3 / h) and the second required ventilation rate (e.g., 80 m3 / h) of the building 100.

[0087] FIG. 8 is a diagram illustrating the air flow in the building 100 when the air conditioning apparatus 10 is stopped and the first required ventilation rate is greater than the second required ventilation rate. That is, this diagram is for explaining the air flow when the processing of steps ST13 to ST15 in FIG. 7 is performed. In the example shown in FIG. 8, the first air supply device 242 and the second air supply device 244 are operated, thereby taking in air at a volume of 80 m3 / h into the second communication passage 15 and taking in air at a volume of 100 m3 / h into the fourth communication passage 20. That is, air at volumes corresponding to the first and second required ventilation rates is taken in. Also, in the example shown in FIG. 8, the first exhaust device 241 and the second exhaust device 243 are operated, thereby discharging air at a volume of 80 m3 / h from the first communication passage 14 and discharging air at a volume of 100 m3 / h from the third communication passage 19. That is, air at volumes corresponding to the first and second required ventilation rates is discharged.

[0088] Referring to FIG. 8, the air flow will be described in order, starting from the fourth communication passage 20. First, air at a volume of 100 m3 / h is taken into the fourth communication passage 20. This air then passes through the second heat exchanger 22 and the third vent 21 and flows into the first floor staircase space T1, and then flows into the first room R1 through the undercut of the first door 103, etc. The air that has flowed into the first room R1 flows into the first section 131 of the guide path 13 through multiple outlets 12 and reaches the branching section 134. Here, the control unit 333 controls the operation of the blower 230 to generate an airflow in which the air that has flowed into the branching section 134 at the blower airflow rate (20 m3 / h in this example) flows into the second section 132. As a result, air at a volume of 80 m3 / h flows into the first communication passage 14, and air at a volume of 20 m3 / h flows into the second section 132. As a result, the volume of air reaching the first heat exchanger 16 through the first communication passage 14, i.e., the first air volume, is 80 m3 / h. Then, as described above, operation of the first air supply device 242 causes 80 m3 / h of air to be taken into the second communication passage 15, and therefore the volume of air flowing from the outdoor space OS to the second communication passage 15 and passing through the heat exchanger, i.e., the second air volume, is 80 m3 / h. In this way, the control unit 333 controls the operation of the blower 230 to guide air at the blower air volume (20 m3 / h in this example) to the second section 132, thereby matching the first air volume and the second air volume.

[0089] The air at a volume of 20 m³ / h that flows into the second section 132 and passes through the air purifier 23 and the air at a volume of 80 m³ / h that flows through the second communication passage 15 and passes through the first heat exchanger 16 join at the junction 135, then flow into the third section 133, and reach the second room R2 and the third room R3. The airflow rates in the second room R2 and the third room R3 are assumed to correspond to the volumes of the two rooms. In the building 100 according to the second embodiment, the volumes of the second room R2 and the third room R3 are assumed to be equal, and equal volumes of airflow flow through both rooms. Therefore, in this example, 50 m³ / h of air flows into the second room R2 and the third room R3. The air flowing into the second room R2 and the third room R3 passes through the undercuts of the second door 104 and the third door 105, and joins in the second-floor staircase space T2. Then, the air with a volume of 100 m3 / h that joins in the second floor staircase space T2 flows along the airflow generated by the second exhaust device 243 to the second air vent 18, reaches the third communication passage 19, passes through the second heat exchanger 22 and is released into the outdoor space OS.

[0090] As described above, when the air conditioning apparatus 10 is not operating, the first required ventilation rate is greater than the second required ventilation rate, and the ventilation equipment 24 performs ventilation at an air volume corresponding to the first and second required ventilation rates, the first air volume and the second air volume can be made to match by the control unit 333 controlling the blower 230 to direct air corresponding to the blower air volume to the second section 132. As a result, the heat exchange efficiency in the first heat exchanger 16 is improved compared to when the first air volume and the second air volume do not match.

[0091] 8, the volume of air flowing through the third communication passage 19 and passing through the second heat exchanger 22 (100 m3 / h in this example) matches the volume of air flowing through the fourth communication passage 20 and passing through the second heat exchanger 22 (100 m3 / h in this example). This improves the heat exchange efficiency of the second heat exchanger 22 compared to when these volumes do not match.

[0092] 7, if the first required ventilation rate is equal to or less than the second required ventilation rate (NO in step ST12), then in step ST16, control unit 333 stops the operation of blower 230. That is, control unit 333 does not operate blower 230. For example, if the first required ventilation rate is 80 m3 / h, the second required ventilation rate is 100 m3 / h, and the first required ventilation rate is smaller than the second required ventilation rate, control unit 333 does not operate blower 230.

[0093] In step ST17, the control unit 333 starts up the ventilation equipment 24.

[0094] 9 is a diagram showing the air flow in building 100 when air conditioning apparatus 10 is stopped and the first required ventilation rate is equal to or less than the second required ventilation rate. That is, this diagram is for explaining the air flow when the processing of steps ST16 and ST17 is performed. In the example shown in FIG. 9, by operating first air supply device 242 and second air supply device 244, air is taken in at a volume of 100 m3 / h into second communication passage 15, and air is taken in at a volume of 80 m3 / h into fourth communication passage 20. Furthermore, by operating first exhaust device 241 and second exhaust device 243, air is discharged at a volume of 100 m3 / h from first communication passage 14, and air is discharged at a volume of 80 m3 / h from third communication passage 19.

[0095] Referring to FIG. 9, the air flow will be described sequentially, starting from the fourth communication passage 20. First, air is introduced into the fourth communication passage 20 at a volume of 80 m³ / h. This air then passes through the second heat exchanger 22 and the third vent 21 and flows into the first-floor staircase space T1. At this time, due to the pressure difference between the first-floor staircase space T1 and the second-floor staircase space T2, air at a volume of 20 m³ / h moves from the second-floor staircase space T2 to the first-floor staircase space T1. This air merges in the first-floor staircase space T1 to become air at a volume of 100 m³ / h, which flows into the first room R1 through the undercut of the first door 103. This air then flows through the multiple exhaust ports 12 into the first section 131 of the guide path 13 and reaches the branch section 134. At this point, the control unit 333 stops the operation of the blower 230. Therefore, the air that has flowed into the branching portion 134 is guided by the airflow generated by the first exhaust device 241 and flows into the first communication passage 14. That is, an air volume of 100 m3 / h flows into the first communication passage 14. As a result, the air volume (first air volume) of the air that reaches the first heat exchanger 16 through the first communication passage 14 is 100 m3 / h. Then, as described above, the operation of the first air supply device 242 causes 100 m3 / h of air to be taken into the second communication passage 15, and therefore the air volume (second air volume) of the air that flows from the outdoor space OS into the second communication passage 15 and passes through the heat exchanger is 100 m3 / h. In this way, the control unit 333 stops the operation of the blower 230 and guides air into the first communication passage 14, so that the first air volume and the second air volume match.

[0096] Then, the air at a volume of 100 m3 / h that flows through the second communication passage 15 and passes through the first heat exchanger 16 passes through the third portion 133 of the guide passage 13 and flows into the second room R2 and the third room R3. This air flows from the second room R2 and the third room R3 to the second-floor staircase space T2 and joins there. Here, a portion of the air in the second-floor staircase space T2, specifically, the air at a volume corresponding to the first required ventilation volume (80 m3 / h in this example), flows along the airflow generated by the second exhaust device 243 to the second air vent 18. The air that flows into the second air vent 18 reaches the third communication passage 19, passes through the second heat exchanger 22, and is released into the outdoor space OS. Meanwhile, the remaining air in the second floor stair space T2 (air with a volume of 20 m3 / h) moves from the second floor stair space T2 to the first floor stair space T1 due to the difference in air pressure, and merges with the air that has flowed from the fourth connecting passage 20 to the first floor stair space T1.

[0097] As described above, when the air conditioning apparatus 10 is not operating, the first required ventilation volume is equal to or less than the second required ventilation volume, and the ventilation equipment 24 is ventilating at an air volume corresponding to the first and second required ventilation volumes, the control unit 333 stops the operation of the blower 230. As a result, the air in the guide path 13 is guided to flow into the first communication path 14, so that the first air volume and the second air volume match. As a result, the heat exchange efficiency in the first heat exchanger 16 can be improved compared to when the first air volume and the second air volume do not match.

[0098] 9, the volume of air flowing through the third communication passage 19 and passing through the second heat exchanger 22 (80 m3 / h in this example) is the same as the volume of air flowing through the fourth communication passage 20 and passing through the second heat exchanger 22 (80 m3 / h in this example). Therefore, the heat exchange efficiency in the second heat exchanger 22 is improved compared to when these volumes do not match.

[0099] Note that although an example where the first required ventilation rate is 80 m3 / h and the second required ventilation rate is 100 m3 / h has been described above, the control unit 333 also stops the blower 230 when, for example, the first required ventilation rate and the second required ventilation rate are 100 m3 / h and the two required ventilation rates are equal. The air flow in this case is generally similar to the example shown in Figure 9. However, when the two required ventilation rates are equal, air does not move from the second floor stair space T2 to the first floor stair space T1 due to the pressure difference.

[0100] 10 is a flowchart showing the flow of processing executed by the processing unit when the air conditioning apparatus 10 is operating. That is, Fig. 10 is a flowchart showing the flow of processing when the determination is YES in step ST11 of Fig. 7.

[0101] In step ST21, the air conditioning control unit 331 determines an air conditioner airflow rate (an example of a fourth airflow rate) which is the airflow rate of air sent from the air conditioner 10. Details of the processing in step ST21 will be described later.

[0102] In step ST22, the control unit 333 calculates the blower airflow (an example of a third airflow) based on the difference between the second required ventilation volume and the air conditioner airflow. For example, if the second required ventilation volume is 100 m3 / h and the air conditioner airflow volume is set to 300 m3 / h, the control unit 333 calculates "300 m3 / h - 100 m3 / h" and finds that the blower airflow volume is 200 m3 / h.

[0103] In step ST23, the control unit 333 starts up the ventilation equipment 24.

[0104] FIG. 11 is a diagram showing the air flow in the building 100 when the air conditioning apparatus 10 is operating. That is, this is a diagram for explaining the air flow when the processing of steps ST21 to ST23 is performed. In the example shown in FIG. 11, by operating the first air supply device 242 and the second air supply device 244, an air volume of 100 m3 / h is taken into the second communication passage 15, and an air volume of 100 m3 / h is taken into the fourth communication passage 20. Furthermore, by operating the first exhaust device 241 and the second exhaust device 243, an air volume of 100 m3 / h is discharged from the first communication passage 14, and an air volume of 100 m3 / h is discharged from the third communication passage 19.

[0105] Starting from underfloor, as described above, the air conditioner airflow rate is set to 300 m3 / h, so conditioned air at a rate of 300 m3 / h flows from the underfloor space SP0 to the first room R1. This air then flows through the multiple outlets 12 into the first section 131 of the guide path 13 and reaches the branching section 134. Here, the control unit 333 controls the operation of the blower 230 to generate an airflow in which air at the blower airflow rate (200 m3 / h in this example) flows into the second section 132. As a result, air at a rate of 100 m3 / h flows through the first communication passage 14, and air at a rate of 200 m3 / h flows through the second section 132. As a result, the airflow rate (first airflow rate) of the air reaching the first heat exchanger 16 through the first communication passage 14 is 100 m3 / h. As described above, when the first air supply device 242 is operated, 100 m3 / h of air is taken into the second communication passage 15, and therefore the air volume (second air volume) of the air flowing from the outdoor space OS to the second communication passage 15 and passing through the heat exchanger is 100 m3 / h. In this way, the control unit 333 controls the operation of the blower 230 to guide 200 m3 / h of air to the second section 132, thereby making the first air volume and the second air volume equal.

[0106] The air at a volume of 200 m³ / h that flows into the second section 132 and passes through the air purifier 23 and the air at a volume of 100 m³ / h that flows through the second communication passage 15 and passes through the first heat exchanger 16 join at the confluence 135, then flow into the third section 133, and reach the second room R2 and the third room R3. These airs join in the second-floor staircase space T2. Here, a portion of the air in the second-floor staircase space T2, specifically, the air at a volume corresponding to the first required ventilation rate (100 m³ / h in this example), flows along the airflow generated by the second exhaust device 243 to the second air vent 18. The air that flows into the second air vent 18 reaches the third communication passage 19, passes through the second heat exchanger 22, and is released into the outdoor space OS. Meanwhile, the remaining air in the second-floor staircase space T2 (air with an air volume of 200 m3 / h) moves from the second-floor staircase space T2 to the first-floor staircase space T1 due to the difference in air pressure, and merges with the air that has flowed from the outdoor space OS through the fourth communication passage 20 into the first-floor staircase space T1. As described above, the second air supply device 244 takes in 100 m3 / h of air into the fourth communication passage 20. Therefore, a total of 300 m3 / h of air flows into the first-floor staircase space T1. This air is sucked into the air conditioning unit 10 and sent back to the underfloor space SP0.

[0107] As described above, when the air conditioning apparatus 10 is operating and the ventilation equipment 24 performs ventilation at an air volume corresponding to the first required ventilation volume and the second required ventilation volume, the first air volume and the second air volume can be matched by directing air at a blower air volume based on the difference between the second required ventilation volume and the air conditioner air volume to the second section 132. As a result, the heat exchange efficiency in the first heat exchanger 16 is improved compared to when the first air volume and the second air volume do not match.

[0108] Furthermore, in the example shown in Figure 11, the volume of air flowing through the third communication passage 19 and passing through the second heat exchanger 22 is the same as the volume of air flowing through the fourth communication passage 20 and passing through the second heat exchanger 22, so the heat exchange efficiency in the second heat exchanger 22 is improved compared to when these volumes do not match.

[0109] Furthermore, in the example shown in Figure 11, the fan airflow is calculated based on the difference between the second required ventilation volume and the air conditioner airflow, so the fan airflow will never be smaller than the airflow obtained by subtracting the second required ventilation volume from the air conditioner airflow. That is, when the fan airflow volume is X1, the air conditioner airflow volume is X2, and the second required ventilation volume is X3, the fan airflow volume is set to an airflow volume that satisfies "X1 ≥ (X2 - X3)." This prevents air from flowing from the first room R1 into the first-floor staircase space T1. As a result, it becomes possible to accurately calculate the control reference value, which will be described later.

[0110] Returning to FIG. 10, in step ST24, the air conditioning control unit 331 determines whether the set temperature of the air conditioner 10 has been changed. Furthermore, it determines whether the air temperature in the outdoor space OS (hereinafter referred to as outside air temperature) has changed. Note that whether the set temperature has been changed may be determined based on whether the air conditioning control unit 331 has received a signal indicating a command to change the set temperature from a remote control operated by the user or the like. Also, whether the outside air temperature has changed may be determined based on a signal value transmitted from an outside air temperature sensor (not shown) arranged in the outdoor space OS.

[0111] If the set temperature of the air conditioner 10 has changed, or if the outside air temperature has fluctuated (YES in step ST24), the process returns to step ST21, and the air conditioning control unit 331 determines the air conditioner air volume again.

[0112] On the other hand, if the set temperature of the air conditioning device 10 has not been changed and the outside temperature has not fluctuated (NO in step ST24), in step ST25 the air conditioning control unit 331 determines whether or not a command (signal) to stop operation of the air conditioning device 10 has been received from the user.

[0113] If a command to stop operation of the air conditioner 10 has been received (YES in step ST25), the process returns to step ST2. On the other hand, if a signal to stop operation of the air conditioner 10 has not been received (NO in step ST25), the air conditioning control unit 331 returns the process to step ST24.

[0114] FIG. 12 is a flowchart showing the flow of a process for determining the air conditioner airflow rate (an example of the fourth airflow rate).

[0115] First, in step ST31, the air conditioning control unit 331 calculates a control reference value based on the set temperature of the first room R1, the outside temperature, the heat exchange efficiency of the first heat exchanger 16 and the second heat exchanger 22, and the reference air volume described below.

[0116] The control reference value is a numerical value used to control the air volume of the air conditioner 10. Air conditioners generally have temperature sensors built into multiple locations, such as the outdoor unit and indoor unit. A predetermined temperature difference is calculated using the measurements from these sensors, and the air volume and blown temperature of the air conditioner are controlled based on this temperature difference. For example, if the temperature difference between the room temperature and the set temperature is large, the air volume of the air conditioner is set to high; if the temperature difference is small, the air volume is set to medium; and if the temperature difference is about the same (i.e., if there is almost no temperature difference between the room temperature and the set temperature), the air volume is set to low. The air conditioning control unit 331 according to this embodiment also basically performs the same processing as above to control the air conditioner 10.

[0117] However, because the indoor unit of the air conditioner 10 according to this embodiment is installed in the storage space U (Fig. 1), the temperature measured by the temperature sensor built into the indoor unit is the temperature of the first floor non-occupied room (first floor staircase space T1). Furthermore, the temperature of the air conditioned by the air conditioner 10 is the temperature of the air that has passed through the second heat exchanger 22 and the air that has circulated through the second floor space S2 and moved from the second floor staircase space T2 to the first floor staircase space T1 due to the pressure difference.

[0118] Therefore, the air conditioning control unit 331 according to this embodiment calculates a control reference value.

[0119] To calculate the control reference value, the air conditioning control unit 331 first calculates the blowout temperatures of the second floor rooms (the second room R2 and the third room R3 in this embodiment).

[0120] If the discharge temperature of the second floor room is B1, the set temperature of the first floor room (first room R1 in this embodiment) is S, the air volume of the air blown out from the air conditioning unit, which is an assumed air volume (hereinafter referred to as the reference air volume) for calculating the control reference value, is V1, the outside air temperature is T2, the heat exchange efficiency of the first heat exchanger 16 is C1, and the second required ventilation volume is V2, the discharge temperature of the second floor room can be found by calculating the following formula (1).

[0121] B1={(S×V1)+(S-T2)×C1×V2}÷(V2+V1)...Equation (1) For example, assume that the set temperature S of the first-floor room is 20°C, the reference airflow rate V1 is 400 m3 / h, the outside temperature T2 is 0°C, the heat exchange efficiency C1 of the first heat exchanger 16 is 80%, and the second required ventilation rate V2 is 100 m3 / h. In this case, the air conditioning control unit 331 calculates "B1 = {(20°C × 400 m3 / h) + (20°C - 0°C) × 80% × 100 m3 / h} ÷ 500 m3 / h" and calculates "B1 = 19.2°C." In other words, it calculates that the discharge temperature of the second-floor room is approximately 19°C.

[0122] Next, the air conditioning control unit 331 calculates the temperature of the first floor non-occupied room (first floor staircase space T1 in this embodiment).

[0123] If the temperature in the non-occupied room on the first floor is B2, the air volume moving from the second floor stair space T2 to the first floor stair space T1 due to the air pressure difference is V3, the heat exchange efficiency of the second heat exchanger 22 is C2, and the first required ventilation volume is V4, the temperature in the non-occupied room on the first floor can be found by calculating the following equation (2).

[0124] B2={(B1×V3)+(B1-T2)×(C2×V4)}÷(V3+V4)...Equation (2) For example, assume that the discharge temperature B1 of the second-floor room is 19°C, the air volume V3 moving from the second-floor staircase space T2 to the first-floor staircase space T1 due to the pressure difference is 400 m3 / h, the heat exchange efficiency C2 of the second heat exchanger 22 is 80%, and the required ventilation volume V4 of the first-floor space SP1 is 100 m3 / h. In this case, the air conditioning control unit 331 calculates "B2 = {(19°C × 400 m3 / h) + (19°C - 0°C) × 80% × 100 m3 / h} ÷ 500 m3 / h" to arrive at "B2 = 18.4°C." Although there is a further drop from the 18.4°C due to heat loss, the more well-insulated the home is, the smaller the heat loss, resulting in a temperature closer to the above calculation (approximately 18°C).

[0125] Assuming that the building 100 is a highly insulated house, appropriate temperature control is possible by setting the control standard value as estimated from the temperature difference between indoors and outdoors and the heat exchange efficiency of the first heat exchanger 16 and the second heat exchanger 22 (18°C in this example), as described above.

[0126] In addition, when the airflow rate of the blower 230 of the air purifier 23 is X1, the air conditioner airflow rate is X2, and the second required ventilation rate is X3, if "(X2-X3) ≥ X1" holds, air will flow from the first-floor habitable room (first room R1) to the first-floor non-habitable room (first-floor staircase space T1), changing the temperature in the first-floor non-habitable room, which may make it difficult to accurately calculate the control reference value. In response to this, as described above, in this embodiment, the blower airflow rate is set to an airflow rate at which "X1 ≥ (X2-X3)" holds. For example, the blower airflow rate is set to the minimum airflow rate at which "X1 ≥ (X2-X3)" holds. Therefore, air is prevented from flowing from the first room R1 to the first-floor staircase space T1, allowing the control reference value to be accurately calculated.

[0127] The air conditioning control unit 331 may also calculate a value for heat loss according to the thermal insulation performance of the building 100. The control reference value may then be corrected using this value for heat loss. The correction value for correcting the control reference value may be calculated using a thermal load analysis simulation or the like.

[0128] Furthermore, a temperature sensor may be installed in a first floor room, a second floor room, or the like, and the air conditioner 10 may be controlled in accordance with the temperature measured by the temperature sensor.

[0129] In addition, if a staircase is provided in the first floor room that allows users and air to move between the first floor room (first room R1) and the second floor non-habitable room (second floor staircase space T2), and air from the second floor non-habitable room flows directly into the first floor room, it is assumed that air will flow from the first floor room to the first floor non-habitable room. In this case, a temperature sensor may be installed in the first floor room.

[0130] 12, in step ST32, the air conditioning control unit 331 calculates the temperature difference between the set temperature of the air conditioned space (for example, the first room R1) and the room temperature of the air conditioned space (for example, the first room R1). The room temperature of the first room R1 may be obtained, for example, from a temperature sensor installed in the first room R1.

[0131] In step ST33, the air conditioning control unit 331 determines whether the temperature difference is equal to or greater than a first threshold value. The first threshold value is, for example, 2°C.

[0132] If the temperature difference is equal to or greater than the first threshold value (YES in step ST33), in step ST34, the air conditioning control unit 331 sets the air conditioner airflow to a high airflow rate (for example, 400 m3 / h).

[0133] On the other hand, if the temperature difference is smaller than the first threshold value (NO in step ST33), then in step ST35, the air conditioning control unit 331 calculates the temperature difference between the set temperature of the air-conditioned space (e.g., the first room R1) and the control reference value, and determines whether this temperature difference is smaller than a second threshold value (e.g., 1°C).

[0134] If the temperature difference is greater than the second threshold value (NO in step ST35), then in step ST36, the air conditioning control unit 331 sets the air conditioner airflow rate to a medium airflow rate (for example, 300 m3 / h).

[0135] If the temperature difference is smaller than the second threshold value (YES in step ST35), the air conditioning control unit 331 sets the air conditioner air volume to a low volume (for example, 200 m3 / h) in step ST37.

[0136] After executing the processes of steps ST34 to ST37, the air conditioning control unit 331 executes the process of step ST22 (FIG. 10).

[0137] As described above, according to the air conditioning system 1A of the second embodiment, the first air volume of the air flowing from the guide path 13 to the first communication passage and passing through the heat exchanger matches the second air volume of the air flowing from the outdoor space OS to the second communication passage 15 and passing through the first heat exchanger 16. Therefore, the heat exchange efficiency in the first heat exchanger 16 is improved compared to when the first air volume and the second air volume do not match.

[0138] Furthermore, according to the air conditioning system 1A, the blower airflow rate is calculated based on first information D1 indicating the required ventilation rate for the first floor space SP1 and second information D2 indicating the required ventilation rate for the second floor space SP2. By operating the blower 230 based on this blower airflow rate, the first airflow rate and the second airflow rate can be made to accurately match.

[0139] Furthermore, according to the air conditioning system 1A, when the required ventilation volume for the first floor space SP1 is greater than the required ventilation volume for the second floor space SP2, the fan airflow rate is calculated, and the fan 230 is operated based on this fan airflow rate. This allows the first airflow rate and the second airflow rate to be accurately matched.

[0140] Furthermore, according to the air conditioning system 1A, when the required ventilation volume of the first floor space SP1 is equal to or less than the required ventilation volume of the second floor space SP2, the blower 230 stops, thereby allowing the first air volume and the second air volume to be accurately matched.

[0141] Furthermore, according to the air conditioning system 1A, when the air conditioner 10 is operating, the fan airflow rate is calculated based on the difference between the required ventilation rate for the second floor space SP2 and the air conditioner airflow rate, so the fan airflow rate can be accurately calculated. By operating the fan 230 based on this fan airflow rate, the first airflow rate and the second airflow rate can be accurately matched.

[0142] The following describes various modifications of the above-described embodiment 2. These modifications can be applied in any combination.

[0143] (Variant 2) In the previous embodiment, an example was described in which, when the air conditioning device 10 is stopped and the first required ventilation volume is greater than the second required ventilation volume, the blower air volume is calculated based on the difference between the first required ventilation volume and the second required ventilation volume, and the blower 230 is controlled based on this blower air volume.

[0144] However, depending on the performance of blower 230, it may be difficult to guide air at a volume corresponding to the blower airflow rate to second portion 132. For example, if air purifier 23 is equipped with blower 230 whose blower airflow rate is 20 m3 / h and whose minimum blowing rate is set to 50 m3 / h, it is not possible to guide air at the volume corresponding to the blower airflow rate to second portion 132. In such a case, control unit 333 may control the operation of blower 230 to generate an airflow that sends air at the minimum blowing rate to second portion 132 of guide path 13.

[0145] FIG. 13 is a diagram showing the air flow in building 100 according to a variation of embodiment 2. In the example shown in FIG. 13, the first required ventilation rate of building 100 is 100 m3 / h, and the second required ventilation rate is 80 m3 / h. In the example shown in FIG. 13, by operating the first intake device and the second intake device, air is taken in at a volume of 80 m3 / h into second communication passage 15, and air is taken in at a volume of 100 m3 / h into fourth communication passage 20. In addition, by operating first exhaust device 241 and second exhaust device 243, air is discharged from first communication passage 14 at a volume of 80 m3 / h, and air is discharged from third communication passage 19 at a volume of 100 m3 / h.

[0146] Starting with the fourth communication passage 20, 100 m³ / h of air is first introduced into the fourth communication passage 20 and flows into the first-floor staircase space T1. At this time, due to the pressure difference, 30 m³ / h of air moves from the second-floor staircase space T2 to the first-floor staircase space T1. These air flows merge in the first-floor staircase space T1, and 130 m³ / h of air flows into the first room R1 and reaches the junction 135. Here, the control unit 333 generates an airflow that guides the minimum airflow rate (50 m³ / h) into the second portion 132 of the guide path 13. As a result, 80 m³ / h of air flows into the first communication passage 14, and 50 m³ / h of air flows into the second portion 132 of the guide path 13. As a result, the airflow rate (first airflow rate) of the air reaching the first heat exchanger 16 through the first communication passage 14 is 80 m³ / h. As described above, operation of the first air supply device 242 causes 80 m3 / h of air to be taken into the second communication passage 15, and therefore the air volume (second air volume) of the air flowing from the outdoor space OS to the second communication passage 15 and passing through the heat exchanger is 80 m3 / h. In this way, the control unit 333 controls the operation of the blower 230 to guide the minimum air volume (50 m3 / h in this example) to the second section 132, thereby matching the first air volume and the second air volume.

[0147] The 50 m3 / h air that flows into the second section 132 of the guide path 13 and passes through the air purifier 23 and the 80 m3 / h air that flows through the second communication passage 15 join at the junction 135, and then flow equally into the second room R2 and the third room R3 at 65 m3 / h each. These air flows from the second room R2 and the third room R3 to the second-floor staircase space T2 and joins there. Here, the 100 m3 / h air flows into the third communication passage 19 along the airflow generated by the second exhaust device 243. Meanwhile, the remaining air in the second-floor staircase space T2 (air with a volume of 30 m3 / h) moves from the second-floor staircase space T2 to the first-floor staircase space T1 due to the pressure difference, and joins with the air that flowed from the fourth communication passage 20 to the first-floor staircase space T1.

[0148] As described above, when the minimum airflow rate of the blower 230 is greater than the blower airflow rate, the control unit 333 controls the operation of the blower 230 to generate an airflow that sends the minimum airflow rate to the second portion 132 of the guide path 13. In this case, the difference between the minimum airflow rate and the blower airflow rate is adjusted by the movement of air due to the air pressure difference between the first floor stair space T1 and the second floor stair space T2, thereby achieving the same effect as that described in the second embodiment.

[0149] (3) In the second embodiment, the blower 230 is provided in the air purifier 23. However, the blower 230 may be provided in the second section 132 independently of the air purifier 23.

[0150] (4) In the previous second embodiment, an example was described in which the control device 30 has the air conditioning control unit 331, but the air conditioning control unit 331 may be realized by a device separate from the control device 30. For example, the functions of the air conditioning control unit 331 may be realized by a microcomputer (not shown) included in the air conditioning device 10 executing a predetermined program stored in a memory (not shown).

[0151] (5) In the above embodiment, an example was described in which the control device 30 was configured by an operation panel. However, the control device 30 may be configured by a device installed in a building different from the building 100. For example, the control device 30 may be configured by a cloud server or an on-premise server configured by one or more computers.

[0152] The above-described embodiments mainly include inventions having the following configurations.

[0153] an air conditioning system constructed in a building having an underfloor space, a first space above the underfloor space, and a second space above the first space, and comprising: an air conditioning unit that conditions the air in the underfloor space and sends the air from the underfloor space to the first space; an exhaust port formed in the first space and discharging air sent from the underfloor space to the first space; a supply port formed in the second space and supplying air to the second space; a guide path that connects the exhaust port and the supply port and guides the air discharged from the exhaust port to the supply port; a first communication passage that branches off from the guide path and connects the guide path to an outdoor space outside the building; a second communication passage that connects a downstream portion of the guide path downstream of the branch point of the first communication passage with the outdoor space; and a heat exchanger connected to the first communication passage and the second communication passage and performing heat exchange between the air flowing through the first communication passage and the air flowing through the second communication passage.

[0154] A second invention may be an air conditioning system according to the first invention, further comprising: a blower arranged in the downstream portion and generating an airflow that guides air from the first space to the downstream portion; and a control device that controls the operation of the blower to match a first air volume of air flowing from the guide path to the first communication passage and passing through the heat exchanger with a second air volume of air flowing from the outdoor space to the second communication passage and passing through the heat exchanger.

[0155] A third invention is an air conditioning system according to the first or second invention, wherein the control device acquires first information indicating the required ventilation volume of the first space and second information indicating the required ventilation volume of the second space, and calculates a third air volume of the airflow generated by the blower based on the first information and the second information.

[0156] A fourth invention is an air conditioning system according to the third invention, wherein when the required ventilation volume of the first space is greater than the required ventilation volume of the second space, the control device may calculate the third air volume based on the difference between the required ventilation volume of the first space and the required ventilation volume of the second space.

[0157] A fifth invention is an air conditioning system according to any one of the second to fourth inventions, wherein the control device may stop the blower when the required ventilation volume of the first space is equal to or less than the required ventilation volume of the second space.

[0158] A sixth invention is an air conditioning system according to the second invention, wherein when the air conditioning device is operating, the control device acquires second information indicating the required ventilation volume of the second space, acquires a fourth airflow volume of air sent from the air conditioning device to the first space, and calculates a third airflow volume of the airflow generated by the blower based on the difference between the required ventilation volume of the second space and the fourth airflow volume.

[0159] An air conditioning control method according to a seventh aspect of the present invention is an air conditioning control method executed by a control device in an air conditioning system constructed in a building having an underfloor space, a first space located above the underfloor space, and a second space located above the first space, the air conditioning system comprising: an air conditioner that conditions the air in the underfloor space and sends air from the underfloor space to the first space; an exhaust port formed in the first space and that discharges air sent from the underfloor space to the first space; a supply port formed in the second space and that supplies air to the second space; a guide path that connects the exhaust port and the supply port and guides the air discharged from the exhaust port to the supply port; a first communication passage that connects the outdoor space to the first space; a second communication passage that connects the outdoor space to a downstream portion of the guide path downstream of the branch point of the first communication passage; a heat exchanger that is connected to the first communication passage and the second communication passage and that performs heat exchange between the air flowing through the first communication passage and the air flowing through the second communication passage; and a blower that is arranged in the downstream portion and generates an airflow that guides the air of the first space to the downstream portion, wherein the control device acquires first information that indicates the required ventilation volume of the first space, acquires second information that indicates the required ventilation volume of the second space, and acquires third information that indicates the operating status of the air conditioning device, and controls the operation of the blower based on the first information, the second information, and the third information.

[0160] A program according to an eighth aspect of the present invention is a program for causing a control device to execute processing in an air conditioning system constructed in a building having an underfloor space, a first space above the underfloor space, and a second space above the first space, the air conditioning system including an air conditioner that conditions the air in the underfloor space and sends air from the underfloor space to the first space, an exhaust port formed in the first space and that discharges air sent from the underfloor space to the first space, a supply port formed in the second space and that supplies air to the second space, a guide path that connects the exhaust port and the supply port and guides the air discharged from the exhaust port to the supply port, and a cooling air supply path that branches off from the guide path and connects the guide path to an outdoor space outside the building. the control device is provided with: a first communication passage that connects a downstream portion of the guide path downstream of a branch point of the first communication passage with the outdoor space; a second communication passage that connects the outdoor space with a downstream portion of the guide path downstream of a branch point of the first communication passage; a heat exchanger that is connected to the first communication passage and the second communication passage and performs heat exchange between air flowing through the first communication passage and air flowing through the second communication passage; and a blower that is disposed in the downstream portion and generates an airflow that guides air from the first space to the downstream portion, and by executing the program, the control device obtains first information that indicates a required ventilation volume of the first space, obtains second information that indicates a required ventilation volume of the second space, and obtains third information that indicates an operating state of the air conditioning device, and controls the operation of the blower based on the first information, the second information, and the third information. [Explanation of symbols]

[0161] 1, 1A: Air conditioning system 10: Air conditioning equipment 11: First ventilation opening 12: Outlet 13: Guideway 14: 1st communication passage 15:Second communication passage 16: 1st heat exchanger 17: Supply port 18: Second ventilation hole 19:Third communication passage 20: 4th communication passage 21: Third ventilation opening 22:Second heat exchanger 23: Air purifier 24: Ventilation equipment 25: Auxiliary air conditioning unit 30: Control device 100: Building 131 :1st part 132:Second part 133: 3rd part 134: Branch 135: Junction 230: Blower 241: First exhaust system 242: First air supply system 243: Second exhaust system 244: Second air supply system OS:Outdoor space R1: Room 1 R2: Room 2 R3: Room 3 SP0: Underfloor space SP1: First floor space (example of first space) SP2: Second floor space (example of second space) SP3: Inter-floor space SP4: Attic space

Claims

1. An air conditioning system constructed in a building including an underfloor space, a first space located above the underfloor space, and a second space located above the first space, an air conditioning device that conditions the air in the underfloor space and sends the air in the underfloor space to the first space; an exhaust port formed in the first space and configured to exhaust air sent from the underfloor space to the first space; a supply port formed in the second space and configured to supply air to the second space; a guide path that connects the exhaust port and the supply port and guides the air discharged from the exhaust port to the supply port; a first communication passage branching from the guide passage and communicating the guide passage with an outdoor space outside the building; a second communication passage that connects a downstream portion of the guide path downstream of a branch point of the first communication passage with the outdoor space; a heat exchanger connected to the first communication passage and the second communication passage, for exchanging heat between air flowing through the first communication passage and air flowing through the second communication passage, Air conditioning system.

2. a blower disposed in the downstream portion and generating an airflow that guides the air in the first space to the downstream portion; a control device that controls the operation of the blower to make a first air volume of air that flows from the guide path to the first communication passage and passes through the heat exchanger equal to a second air volume of air that flows from the outdoor space to the second communication passage and passes through the heat exchanger. The air conditioning system of claim 1 .

3. the control device acquires first information indicating a required ventilation volume for the first space and second information indicating a required ventilation volume for the second space, and calculates a third air volume of the airflow generated by the blower based on the first information and the second information.

3. The air conditioning system of claim 2.

4. when the required ventilation volume of the first space is greater than the required ventilation volume of the second space, the control device calculates the third airflow volume based on a difference between the required ventilation volume of the first space and the required ventilation volume of the second space.

4. The air conditioning system of claim 3.

5. the control device stops the blower when the required ventilation volume of the first space is equal to or less than the required ventilation volume of the second space.

5. An air conditioning system according to claim 2.

6. When the air conditioning device is operating, the control device acquiring second information indicating a required ventilation volume for the second space; acquire a fourth airflow rate of air sent from the air conditioning device to the first space; calculating a third air volume of the airflow generated by the blower based on a difference between the required ventilation volume of the second space and the fourth air volume; 3. The air conditioning system of claim 2.

7. An air conditioning control method executed by a control device in an air conditioning system constructed in a building including an underfloor space, a first space located above the underfloor space, and a second space located above the first space, The air conditioning system includes: an air conditioning device that conditions the air in the underfloor space and sends the air in the underfloor space to the first space; an exhaust port formed in the first space and configured to exhaust air sent from the underfloor space to the first space; a supply port formed in the second space and configured to supply air to the second space; a guide path that connects the exhaust port and the supply port and guides the air discharged from the exhaust port to the supply port; a first communication passage branching from the guide passage and communicating the guide passage with an outdoor space outside the building; a second communication passage that connects a downstream portion of the guide path downstream of a branch point of the first communication passage with the outdoor space; a heat exchanger connected to the first communication passage and the second communication passage, for exchanging heat between air flowing through the first communication passage and air flowing through the second communication passage; a blower disposed in the downstream portion and generating an airflow that guides the air in the first space to the downstream portion; Equipped with The control device acquiring first information indicating a required ventilation volume for the first space; acquiring second information indicating a required ventilation volume for the second space; Acquire third information indicating the operating status of the air conditioning device; an air conditioning control method for controlling operation of the blower based on the first information, the second information, and the third information;

8. A program for causing a control device to execute processing in an air conditioning system constructed in a building including an underfloor space, a first space located above the underfloor space, and a second space located above the first space, The air conditioning system includes: an air conditioning device that conditions the air in the underfloor space and sends the air in the underfloor space to the first space; an exhaust port formed in the first space and configured to exhaust air sent from the underfloor space to the first space; a supply port formed in the second space and configured to supply air to the second space; a guide path that connects the exhaust port and the supply port and guides the air discharged from the exhaust port to the supply port; a first communication passage branching from the guide passage and communicating the guide passage with an outdoor space outside the building; a second communication passage that connects a downstream portion of the guide path downstream of a branch point of the first communication passage with the outdoor space; a heat exchanger connected to the first communication passage and the second communication passage, for exchanging heat between air flowing through the first communication passage and air flowing through the second communication passage; a blower disposed in the downstream portion and generating an airflow that guides the air in the first space to the downstream portion; Equipped with By executing the program, the control device acquiring first information indicating a required ventilation volume for the first space; acquiring second information indicating a required ventilation volume for the second space; Acquire third information indicating the operating status of the air conditioning device; A program that controls operation of the blower based on the first information, the second information, and the third information.

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