Control device, control unit, and control system

Abstract

To improve comfort of a thermal environment of an object space having a double layer window.SOLUTION: Each of the first double-layer window (21) and the second double-layer window (22) has an air path (P) between an inner glass pane (21a) and an outer glass pane (21b), the air path (P) allowing the target space (S) to communicate with the outside, when an index indicating a temperature of air in the air passage (P) is a first index, if the first index of the first double-layer window (21) is higher than the first index of the second double-layer window (22), or if the first index of the first double-layer window (21) is equal to or higher than a first value and the first index of the second double-layer window (22) is lower than the first value, the control device has a first mode in which a first air flow rate of the first double-layer window (21) is increased more preferentially than that of the second double-layer window (22).SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a control device, a control unit, and a control system. [Background technology]

[0002] The ventilation system disclosed in Patent Document 1 includes multiple double-skinned windows with an outer glass and an inner glass. The double-skinned windows are configured to take in outside air that passes between the outer and inner glass into the room. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-148038 Summary of the Invention [Problem to be solved by the invention]

[0004] In such multiple windows, the amount of heat generated by solar radiation in the air between the outer and inner panes varies depending on the direction the windows are facing. In other words, the air between the outer and inner panes of windows facing in the direction of more solar radiation is hotter than that of other windows, which may result in a worsening of the thermal comfort around the windows in the target space.

[0005] An object of the present disclosure is to improve the comfort of the thermal environment of a target space. [Means for solving the problem]

[0006] The first aspect is a window unit (20) having a plurality of double-glazed windows each having an inner glass (21a) facing a target space (S) and an outer glass (21b) facing the outside of the room, wherein an air passage (P) communicating the target space (S) with the outside of the room is formed between the inner glass (21a) and the outer glass (21b); an exhaust mechanism (12) that exhausts air from the target space (S) to the outside through the double-layered windows (21, 22, 23); a control device for controlling an exhaust unit (U2) including an air volume adjustment mechanism (29) for adjusting a first air volume of air passing through the double-layered windows (21, 22, 23), The window unit (20) includes a first double-layer window (21) and a second double-layer window (22), The air conditioner has a first mode in which, when an index indicating the temperature of the air in the air passage (P) is set to a first index, if the first index of the first double-layer window (21) is higher than the first index of the second double-layer window (22), or if the first index of the first double-layer window (21) is equal to or greater than a first value and the first index of the second double-layer window (22) is lower than the first value, the first air flow rate of the first double-layer window (21) is increased preferentially over that of the second double-layer window (22).

[0007] In the first mode, by executing the first mode, air can be preferentially exhausted to the outside from the double-glazed windows (21, 22, 23) containing air with a higher heat content. This allows the indoor temperature of the target space (S) to be lower than when air is uniformly exhausted from multiple window units (20), thereby improving comfort in the target space (S) in summer.

[0008] The second aspect is the first aspect, When the first index of the first double-layer window (21) is higher than the first index of the second double-layer window (22), or when the first index of the first double-layer window (21) is equal to or greater than a first value and the first index of the second double-layer window (22) is lower than the first value, a second mode is provided in which the first airflow rate of the second double-layer window (22) is reduced preferentially over that of the first double-layer window (21).

[0009] In the second aspect, by combining the first mode and the second mode, it is possible to improve the comfort of the thermal environment in the target space (S) while maintaining a constant ventilation volume in the target space (S). When a design ventilation volume is set in the target space (S), it is possible to realize a comfortable thermal environment in the target space (S) while maintaining the design ventilation volume.

[0010] The third aspect is the first or second aspect, Execute the first mode when a first condition is met; The first condition is met when the total ventilation rate of the target space (S) through the window unit (20) is equal to or less than a target ventilation rate set for the target space (S).

[0011] In the third aspect, when the first condition is met, the ventilation rate of the target space (S) does not satisfy the target ventilation rate. In such a case, by executing the first mode, the ventilation rate of the target space (S) can be maintained at the design value while making the target space (S) thermally comfortable. By executing the first mode and the second mode, the above effect can be further improved.

[0012] A fourth aspect is the first or second aspect, Execute the first mode when a second condition is met; The second condition is met when the enthalpy of the outside air is equal to or greater than the enthalpy of the inside air in the target space (S) that is discharged from the target space (S) to the outside.

[0013] In the fourth mode, when the first condition is met, the enthalpy of the target space (S) is higher than the enthalpy of the outside. In such a case, by executing the first mode, the exhaust of air from the double-layered windows (21, 22, 23) containing relatively high-temperature air is promoted, and the enthalpy of the target space (S) can be reduced. As a result, the comfort of the thermal environment of the target space (S) can be improved. The above effect can be further improved by executing the first mode and the second mode.

[0014] A fifth aspect is the first or second aspect, When a third condition is satisfied, the first mode is executed; The three conditions are met when the current CO2 concentration in the target space (S) is equal to or greater than the target CO2 concentration set in the target space (S).

[0015] In the fifth aspect, when the third condition is met, the CO2 concentration in the target space (S) is higher than the target CO2 concentration. In such a case, by executing the first mode, the CO2 concentration in the target space (S) can be reduced and the target space (S) can be made into a comfortable thermal environment.

[0016] A sixth aspect is a control unit including any one of the first to fifth control devices and a detection section (28) that detects the first index.

[0017] In a sixth aspect, a control unit can be provided that includes a control device and a detection section (28).

[0018] A seventh aspect is a control system including the control unit of the sixth aspect and the air volume adjustment mechanism (29), wherein the control device controls the air volume adjustment mechanism (29).

[0019] In the seventh aspect, a control system including a control unit and an air volume adjustment mechanism (29) can be provided. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a diagram schematically showing the configuration of a ventilation system according to this embodiment. [Figure 2] FIG. 2 is a piping diagram of a refrigerant circuit of the air conditioner. [Figure 3] FIG. 3 is a vertical cross-sectional view of a double-layer window, schematically illustrating the configuration of the double-layer window. [Figure 4] FIG. 4 is a block diagram showing the relationship between various devices in the ventilation system. [Figure 5] FIG. 5 is a flowchart showing the operation of the exhaust unit. [Figure 6] FIG. 6 is a flowchart showing the operation of the exhaust unit of the first modification. [Figure 7] FIG. 7 is a flowchart showing the operation of the exhaust unit of the second modification. [Figure 8]FIG. 8 is a block diagram corresponding to FIG. 4, showing the configuration of a control unit according to the third modification. [Figure 9] FIG. 9 is a block diagram corresponding to FIG. 4, showing the configuration of a control system according to the fourth modification. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the following embodiments and modifications are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or its uses. Furthermore, each configuration of each embodiment, modification, other example, etc. described below can be combined or partially substituted within the scope of the present invention.

[0022] (1) Ventilation system The ventilation system (1) shown in FIG. 1 ventilates an indoor space (S). The indoor space (S) is an example of a target space (S). The indoor space (S) may be, for example, an office or conference room in a building, a hotel guest room, or a banquet hall. The ventilation system (1) supplies outside air to the indoor space (S) based on a preset design ventilation volume, and also exhausts the indoor air to the outside. The ventilation system (1) has an air supply unit (U1) and an exhaust unit (U2).

[0023] (2) Air supply unit The air supply unit (U1) supplies outside air to the indoor space (S) and includes an air conditioner (30) and an air supply duct (11).

[0024] (2-1) Air supply duct The air supply duct (11) is a duct that conveys outside air to an indoor unit (30B) described later, and connects the outside with an inlet of the indoor unit (30B).

[0025] (2-2) Air conditioning equipment 1 and 2, the air conditioner (30) has a refrigerant circuit (39) that performs a refrigeration cycle operation. The air conditioner (30) has an indoor unit (30B) disposed in a room space (S) and an outdoor unit (30A) disposed outside the room. The indoor unit (30B) and the outdoor unit (30A) are connected by a communication pipe that forms the refrigerant circuit (39).

[0026] (2-2-1) Outdoor unit The outdoor unit (30A) includes a compressor (31), an outdoor heat exchanger (32), an outdoor fan (33), an expansion valve (34), and a four-way selector valve (35). The compressor (31), the outdoor heat exchanger (32), the expansion valve (34), and the four-way selector valve (35) are connected to a refrigerant circuit (39).

[0027] The compressor (31) compresses the drawn refrigerant and discharges the compressed refrigerant. The compressor (31) is a rotary compressor whose operating frequency (number of rotations) is variable by an inverter device.

[0028] The outdoor heat exchanger (32) exchanges heat between the refrigerant and outdoor air. The outdoor fan (33) transports outdoor air to the outdoor heat exchanger (32).

[0029] The expansion valve (34) reduces the pressure of the refrigerant and is an electronic expansion valve whose opening is adjustable.

[0030] The four-way switching valve (35) switches the flow path of the refrigerant circuit (39). The four-way switching valve (35) switches between a first state indicated by a solid line in Fig. 3 and a second state indicated by a dashed line in Fig. 3. In the first state, the refrigeration cycle performs a cooling operation. In the second state, the refrigeration cycle performs a heating operation.

[0031] (2-2-2) Indoor unit The indoor unit (30B) includes an indoor heat exchanger (36) and an indoor fan (37). The indoor unit (30B) blows out the air flowing in through the air supply duct (11) into the indoor space (S).

[0032] The indoor unit (30B) is provided with an air inlet (not shown) and an air outlet (not shown). Outside air flowing through the air supply duct (11) is drawn into the air inlet. The air outlet blows the air into the indoor space (S). The indoor heat exchanger (36) and the indoor fan (37) are disposed in an air duct connecting the air inlet and the air outlet.

[0033] The indoor heat exchanger (36) is connected to the refrigerant circuit (39). The indoor heat exchanger (36) exchanges heat between the refrigerant and the indoor air. The indoor fan (37) transports the indoor air to the indoor heat exchanger (36).

[0034] (2-2-3) Air conditioning control unit As shown in Fig. 4, the air conditioner (30) has an air conditioning control unit (C1). The air conditioning control unit (C1) includes an MCU (Micro Controller Unit), an electric circuit, and an electronic circuit. The MCU includes a CPU (Central Processing Unit), a memory, and a communication interface. The memory stores various programs to be executed by the CPU.

[0035] The air conditioning control unit (C1) controls the outdoor unit (30A) and the indoor unit (30B). Specifically, the air conditioning control unit (C1) controls the operation of the compressor (31), the outdoor fan (33), and the indoor fan (37), and the opening of the expansion valve (34).

[0036] (3) Exhaust unit The exhaust unit (U2) shown in Fig. 1 exhausts air from the indoor space (S) to the outside. The exhaust unit (U2) includes a window unit (20), an exhaust fan (12), an exhaust duct (27), a damper (29), and a temperature sensor (28).

[0037] (3-1) Window unit The window unit (20) has a plurality of double-layer windows (21, 22, 23). The window unit (20) of this embodiment has three double-layer windows (21, 22, 23): a first double-layer window (21), a second double-layer window (22), and a third double-layer window (23).

[0038] Each double-layer window (21, 22, 23) constitutes a window provided on a wall surface of the interior space (S). Each double-layer window (21, 22, 23) is provided to face a different direction. In this embodiment, the first double-layer window (21) faces west, the second double-layer window (22) faces south, and the third double-layer window (23) faces east. Since each double-layer window (21, 22, 23) has the same structure, the configuration of the first double-layer window (21) will be described below. In the following description, the three double-layer windows (21, 22, 23) may be referred to simply as double-layer windows (21, 22, 23) without being distinguished from one another.

[0039] The double-glazed windows (21, 22, 23) shown in Fig. 3 have an inner glass (21a) facing the interior space (S) and an outer glass (21b) facing the outside. The inner glass (21a) and the outer glass (21b) are arranged facing each other.

[0040] An air passage (P) is formed between the inner glass (21a) and the outer glass (21b). The air passage (P) is formed to extend in the vertical direction. The air passage (P) connects the interior space (S) to the outside. An air passage (P) is formed in each of the first double-layer window (21), the second double-layer window (22), and the third double-layer window (23). The air passage (P) of the first double-layer window (21) is referred to as the first air passage (P1), the air passage (P) of the second double-layer window (22) is referred to as the second air passage (P2), and the air passage (P) of the third double-layer window (23) is referred to as the third air passage (P3).

[0041] Specifically, the double-layered windows (21, 22, 23) have an outlet (25) at one end of the air passage (P) and an inlet (26) at the other end of the air passage (P). The outlet (25) opens to the outside and allows air in the air passage (P) to flow out. The outlet (25) is provided at the bottom of the double-layered windows (21, 22, 23). Air flowing through the exhaust duct (27) flows into the inlet (26). The inlet (26) is provided at the top of the double-layered windows (21, 22, 23).

[0042] The air in the air passage (P) flows from the outlet (25) to the inlet (26). The outlet (25) may be provided at the lower end of the double-layered window (21, 22, 23). The inlet (26) may be provided at the upper end of the double-layered window (21, 22, 23).

[0043] (3-2) Exhaust fan The exhaust fan (12) exhausts air from the indoor space (S) to the outside through the double-layered windows (21, 22, 23). The exhaust fan (12) is an example of an exhaust mechanism (12). The exhaust fan (12) draws air from the indoor space (S) into the exhaust duct (27) and transports the air to the outside. The exhaust fan (12) is connected to a fourth exhaust duct (27d) described below. The air volume of the exhaust duct (27) can be switched between multiple levels.

[0044] (3-3) Exhaust duct 1 and 2, the exhaust duct (27) is connected to the double-layered windows (21, 22, 23). One end of the exhaust duct (27) is connected to the inlet (26) of the air passage (P). Specifically, the exhaust duct (27) includes a first exhaust duct (27a), a second exhaust duct (27b), a third exhaust duct (27c), and a fourth exhaust duct (27d).

[0045] The outlet end of the first exhaust duct (27a) is connected to the first double-layer window (21). The outlet end of the second exhaust duct (27b) is connected to the second double-layer window (22). The outlet end of the third exhaust duct (27c) is connected to the third double-layer window (23). The outlet end of the fourth exhaust duct (27d) is connected to the inlet ends of the first to third exhaust ducts (27a to 27c). The inlet end of the fourth exhaust duct (27d) opens to the room space (S). In this way, when the exhaust fan (12) is operated, air from the room space (S) is sucked into the fourth exhaust duct (27d), and the air in the fourth exhaust duct (27d) is diverted to the first exhaust duct (27a), the second exhaust duct (27b), and the third exhaust duct (27c).

[0046] (3-4) Damper The damper (29) is an air volume adjustment mechanism (29) that adjusts a first volume of air passing through the air passage (P) of the double-layered window (21, 22, 23). The damper (29) includes a first damper (29a), a second damper (29b), and a third damper (29c). The damper (29) constitutes a variable air volume (VAV).

[0047] The first damper (29a) is connected to the first exhaust duct (27a). The air volume passing through the first exhaust duct (27a) is adjusted by adjusting the opening degree of the first damper (29a). In other words, the first damper (29a) adjusts the air volume passing through the first air passage (P1) of the first double-layer window (21).

[0048] The second damper (29b) is connected to the second exhaust duct (27b). The amount of air passing through the second exhaust duct (27b) is adjusted by adjusting the opening of the second damper (29b). In other words, the second damper (29b) adjusts the amount of air passing through the second air passage (P2) of the second double-layer window (22).

[0049] The third damper (29c) is connected to the third exhaust duct (27c). The volume of air passing through the third exhaust duct (27c) is adjusted by adjusting the opening of the third damper (29c). In other words, the third damper (29c) adjusts the volume of air passing through the third air passage (P3) of the third double-layer window (23).

[0050] In this way, by adjusting the opening degree of each damper (29), it is possible to adjust the amount of exhaust air passing through the air passage (P) of each double-layered window (21, 22, 23). In other words, when the rotation speed of the exhaust fan (12) is constant, it is possible to adjust the amount of air from the indoor space (S) that is delivered to each of the three double-layered windows (21, 22, 23) by adjusting the opening degree of each damper (29).

[0051] (3-5) Temperature sensor The temperature sensor (28) detects the air temperature in the air passage (P) of the double-layered window (21, 22, 23). The temperature sensor (28) is an example of a detector (28) that detects a first index. The first index is an index that indicates the air temperature in the double-layered window (21, 22, 23). In this embodiment, the first index is the air temperature in the air passage (P).

[0052] The temperature sensor (28) includes a first temperature sensor (28a), a second temperature sensor (28b), and a third temperature sensor (28c). The first temperature sensor (28a) is disposed in the first air passage (P1). The second temperature sensor (28b) is disposed in the second air passage (P2). The third temperature sensor (28c) is disposed in the third air passage (P3).

[0053] (4) Driving (4-1) Cooling operation In the cooling operation, the air conditioning control unit (C1) sets the four-way selector valve (35) to the first state. In the cooling operation, the operation of the compressor (31), the outdoor fan (33), and the indoor fan (37) is controlled, and the opening of the expansion valve (34) is adjusted.

[0054] During the cooling operation, the refrigerant circuit (39) performs a refrigeration cycle (cooling cycle) in which the outdoor heat exchanger (32) functions as a radiator and the indoor heat exchanger (36) functions as an evaporator.

[0055] (4-2) Heating operation In the heating operation, the air conditioning control unit (C1) sets the four-way selector valve (35) to the second state. In the heating operation, the air conditioning control unit (C1) operates the compressor (31), the outdoor fan (33), and the indoor fan (37), and adjusts the opening of the expansion valve (34).

[0056] During the heating operation, the refrigerant circuit (39) performs a refrigeration cycle (heating cycle) in which the indoor heat exchanger (36) functions as a radiator and the outdoor heat exchanger (32) functions as an evaporator.

[0057] (5) Control device The ventilation system (1) includes a control device (C) that controls the operation of the air supply unit (U1) and the exhaust unit (U2).

[0058] The control device (C) controls the operation of various devices of the air conditioner (30), the dampers (29), and the exhaust fan (12). The control device (C) receives information on temperatures detected by the temperature sensors (28).

[0059] (6) Exhaust unit operation The operation of the exhaust unit (U2) described below is performed when the outdoor temperature is relatively high. The period when the outdoor temperature is relatively high is, for example, when the air conditioner (30) performs cooling operation. In other words, the period when the outdoor temperature is relatively high is summer. The period when the outdoor temperature is relatively low may be from May to September throughout the year.

[0060] In this embodiment, a target exhaust volume Qt is set in advance for the indoor space (S). Since the intake air volume and exhaust volume of the indoor space (S) are the same, the ventilation volume of the indoor space (S) may be referred to as the exhaust volume. That is, the target exhaust volume Qt is the target ventilation volume, and the total exhaust volume is the total ventilation volume. The target exhaust volume Qt is also referred to as the design ventilation volume or the required ventilation volume. The design ventilation volume or the required ventilation volume is determined based on a known calculation method.

[0061] As will be described in detail later, the exhaust unit (U2) executes the first mode when a first condition is met. The first condition is met when the total exhaust volume of the indoor space (S) by the window unit (20) becomes lower than the target exhaust volume set for the indoor space (S). The operation of the exhaust unit (U2) will be described with reference to FIG. 5.

[0062] In step S01, the control device (C) causes the air conditioner (30) to start cooling operation. The four-way selector valve (35) is set to the first state, and the refrigerant circuit (39) performs the first refrigeration cycle operation. At this time, the control device (C) controls the indoor fan (37) and the exhaust fan (12) to rotate at constant speeds. Hereinafter, the control device (C) controls the indoor fan (37) so that the amount of intake air and the amount of exhaust air are equal to each other.

[0063] In step S02, the control device (C) adjusts the volume of air flowing through each exhaust duct (27) to a preset volume. Specifically, the control device (C) controls each damper (29) to a preset opening degree. As a result, the volume of room air delivered to each double-glazed window (21, 22, 23) is determined according to the opening degree of each damper (29).

[0064] Here, the volume of indoor air discharged from the indoor space (S) to the outside through the window unit (20) is the sum of the volumes of indoor air conveyed to the first double-layer window (21), the second double-layer window (22), and the third double-layer window (23). That is, if the volume of air flowing through the first air passage (P1) of the first double-layer window (21) (first air volume) is Q1, the volume of air flowing through the second air passage (P2) of the second double-layer window (22) is Q2, and the volume of air flowing through the third air passage (P3) of the third double-layer window (23) is Q3, the total volume of air discharged to the outside through the fourth exhaust duct (27d) is Q1 + Q2 + Q3. In the following description, the volume of air may also be referred to as the supply air volume.

[0065] In step S03, the control device (C) determines whether the total displacement (Q1+Q2+Q3) is greater than the target displacement Qt. If it is determined that the total displacement (Q1+Q2+Q3) is greater than the target displacement Qt (YES in step S03), the displacement (ventilation rate) is determined to be excessive, and step S04 is executed. If it is determined that the total displacement (Q1+Q2+Q3) is equal to or less than the target displacement Qt (NO in step S03), the displacement (ventilation rate) is determined to be appropriate, and step S05 is executed.

[0066] In step S04, the control device (C) reduces the opening of the damper (29) of the exhaust duct (27) connected to the air passage (P) with the lowest air temperature among the air passages (P) of the double-glazed windows (21, 22, 23). Thereafter, step S03 is executed again.

[0067] For example, assuming that the fully open state of the dampers (29) is 100%, the opening degree of the first damper (29a) is 45%, the opening degree of the second damper (29b) is 30%, and the opening degree of the third damper (29c) is 25%. If it is determined that the air temperature in the first air passage (P1) of the first double-layer window (21) is the lowest, the control device (C) adjusts the opening degree of the first damper (29a) to 40%. Thereafter, if it is determined again in step S04 that the target exhaust rate Qt is greater than the supply air rate and if it is determined in step S05 that the air temperature in the first air passage (P1) of the first double-layer window (21) is the lowest, the control device (C) adjusts the opening degree of the first damper (29a) to 35%. In this way, the control device (C) gradually closes the damper (29) of the exhaust duct (27) connected to the double-layered window (21, 22, 23) that is determined to have the lowest air temperature in the air passage (P) until it is determined that the target exhaust volume Qt is equal to or less than the exhaust volume.

[0068] In step S05, the control device (C) executes the first mode. In the first mode, the airflow rate (first airflow rate) of the air passage (P) through which relatively high-temperature air flows among the air passages (P) of the three double-layered windows (21, 22, 23) is preferentially increased. In this embodiment, the airflow rate of the air passage (P) of the double-layered window (21, 22, 23) through which air with the highest air temperature flows among the air flowing through the air passages (P) of the three double-layered windows (21, 22, 23) is preferentially increased.

[0069] Specifically, in the first mode, the control device (C) increases the opening degree of the damper (29) of the exhaust duct (27) connected to the air passage (P) having the highest air temperature among the air flowing through the air passages (P) of the three double-layer windows (21, 22, 23) preferentially over the other dampers (29). For example, assuming that the air temperature in the air passage (P) of the first double-layer window (21) is T1, the air temperature in the air passage (P) of the second double-layer window (22) is T2, and the air temperature in the third double-layer window (23) is T3, when T2 is higher than T1 and T3, the control device (C) increases the opening degree of the second damper (29b) preferentially over the first damper (29a) and the third damper (29c). In the above example, preferentially increasing the opening of the damper (29) means increasing the opening of only the second damper (29b) without changing the openings of the first damper (29a) and the third damper (29c). The opening of the damper (29) may also be controlled to increase in stages. For example, the opening of the damper (29) may be increased by 5% increments. In the above example, when the opening of the second damper (29b) is 35%, the opening of the second damper (29b) becomes 40% by executing the first mode.

[0070] In this way, the first condition is met when it is determined in step S03 that the target displacement Qt is equal to or less than the total displacement (Q1+Q2+Q3) (NO in step S03), and the first mode is executed.

[0071] In step S06, the control device (C) determines whether the total displacement (Q1+Q2+Q3) is equal to the target displacement Qt. If the total displacement (Q1+Q2+Q3) is equal to the target displacement Qt (YES in step S06), step S09 is executed. If the total displacement (Q1+Q2+Q3) is not equal to the target displacement Qt (NO in step S06), step S07 is executed. Note that it is not necessary to determine in step S06 whether the total displacement (Q1+Q2+Q3) is strictly equal to the target displacement Qt. For example, if the total displacement (Q1+Q2+Q3) is within a predetermined range from the target displacement Qt, step S06 may be determined as YES. The predetermined range is, for example, a range from the target displacement Qt to ±1 to 5% of the target displacement Qt.

[0072] In step S07, the control device (C) determines whether the total displacement (Q1+Q2+Q3) is higher than the target displacement Qt. If it is determined that the total displacement (Q1+Q2+Q3) is higher than the target displacement Qt (YES in step S07), step S08 is executed. If it is determined that the total displacement (Q1+Q2+Q3) is equal to or less than the target displacement Qt (NO in step S07), step S05 is executed again.

[0073] In step S08, the control device (C) executes the second mode. In the second mode, the airflow rate of the air passage (P) through which relatively low-temperature air flows, among the air passages (P) of the three double-layered windows (21, 22, 23), is preferentially reduced. In this embodiment, the airflow rate of the air passage (P) through which the lowest-temperature air flows, among the air passages (P) of the three double-layered windows (21, 22, 23), is preferentially reduced.

[0074] Specifically, in the second mode, the control device (C) preferentially reduces the opening degree of the damper (29) of the exhaust duct (27) connected to the air passage (P) having the lowest air temperature among the air passages (P) of the three double-glazed windows (21, 22, 23) compared to the other dampers (29). For example, when T3 is lower than T1 and T2, the control device (C) preferentially reduces the opening degree of the third damper (29c) compared to the first damper (29a) and the second damper (29b). In the above example, preferentially reducing the opening degree of the damper (29) means reducing the opening degree of only the third damper (29c) without changing the opening degrees of the first damper (29a) and the second damper (29b). Alternatively, the opening degree of the damper (29) may be controlled to be reduced in stages. For example, the opening degree of the damper (29) may be reduced by 5% at a time. In the above example, when the opening degree of the third damper (29c) is 35%, the opening degree of the third damper (29c) becomes 30% by executing the second mode. After executing step S08, step S06 is executed again.

[0075] In step S09, the control device (C) determines whether the air temperatures in the air passages (P) connected to the dampers (29) whose opening degrees are equal to or greater than the first opening degree are the same. The first opening degree is, for example, 20%. If it is determined that the air temperatures in the air passages (P) connected to the dampers (29) whose opening degrees are equal to or greater than the first opening degree are the same (YES in step S09), step S10 is executed. If it is determined that the air temperatures in the air passages (P) connected to the dampers (29) whose opening degrees are equal to or greater than the first opening degree are not the same (NO in step S09), step S11 is executed.

[0076] In step S10, the control device (C) determines whether a predetermined time has elapsed since step S09 was executed. If it is determined that the predetermined time has elapsed (YES in step S10), step S12 is executed. If it is determined that the predetermined time has not elapsed (NO in step S10), step S11 is executed again.

[0077] In step S11, the control device (C) determines whether or not there is room to further increase the opening degree of the damper (29) connected to the air passage (P) excluding the air passage (P) with the lowest air temperature among the air passages (P) connected to the dampers (29) whose opening degree is greater than 0%. If it is determined that there is room to further increase the opening degree of the damper (29) (YES in step S11), the first mode of step S05 is executed again, and the air volume distribution of each air passage (P) is readjusted. If it is determined that there is no room to further increase the opening degree of the damper (29) (NO in step S11), step S12 is executed. In this way, in step S11, it is determined whether or not the opening degree of the damper (29) can be readjusted.

[0078] In step S12, if there is a damper (29) whose opening degree is 0% (fully closed), the control device (C) sets the opening degree of the damper (29) to the first opening degree. If there is no damper (29) that is fully closed, step S12 is not executed. After execution of step S12, the control flow of the exhaust unit (U2) ends. Note that after execution of step S12, step S03 may be executed again.

[0079] (7) Features (7-1) Feature 1 In the exhaust unit (U2) of this embodiment, the control device (C) executes a first mode in which the volume of air flowing through the air passage (P) of the three double-glazed windows (21, 22, 23) with the highest air temperature is preferentially increased over the volumes of air flowing through the other air passages (P). By executing the first mode during periods when cooling operation is required (e.g., summer), the air with the highest amount of heat due to solar radiation can be preferentially exhausted to the outside in the three air passages (P). This allows the volume of air with relatively high temperatures to be increased compared to when the first mode is not executed, thereby suppressing a temperature rise in the indoor space (S) and achieving a comfortable thermal environment.

[0080] (7-2) Feature 2 In the exhaust unit (U2) of this embodiment, the control device (C) executes a second mode in which the volume of air flowing through the air passage (P) having the lowest air temperature among the air passages (P) of the three double-layered windows (21, 22, 23) is reduced preferentially compared to the volume of air flowing through the other air passages.

[0081] By executing the second mode in addition to the first mode in this way, a comfortable thermal environment can be achieved while maintaining the ventilation volume of the indoor space (S) at a target value.

[0082] (7-3) Feature 3 In the exhaust unit (U2) of this embodiment, the first mode is executed when a first condition is met. The first condition is met when the total exhaust volume (Q1+Q2+Q3) of the indoor space (S) by the window unit (20) is equal to or less than a target exhaust volume Qt set for the indoor space (S).

[0083] When the first condition is satisfied, the total exhaust volume is less than the target value, and therefore the exhaust volume from the window unit (20) can be increased. In this case, by executing the first mode, the ventilation volume can be increased and a comfortable thermal environment can be realized. Furthermore, by executing both the first mode and the second mode, this effect can be further improved.

[0084] (8) Variations A modification of the ventilation system (1) of the above embodiment will be described below. Only the configurations different from the above embodiment will be described below.

[0085] (8-1) Variation 1 In the first modification, the control device (C) of the ventilation system (1) executes the first mode when a second condition is met. The second condition is met when the enthalpy of the outside air is equal to or greater than the enthalpy of the inside air in the indoor space (S) that is discharged from the indoor space (S) to the outside.

[0086] The ventilation system (1) of the second modification calculates the enthalpy of the outside air and the enthalpy of the inside air in the indoor space (S). The enthalpy is calculated based on a known calculation method. The ventilation system (1) may have a sensor (not shown) for detecting the enthalpy of the outside air and the inside air. The enthalpy of the inside air is the enthalpy of the air discharged to the exhaust duct (27) (exhaust enthalpy). The second modification will be specifically described below with reference to FIG. 5.

[0087] Steps S21 to S24 are the same as steps S01 to S04 in the above embodiment, and therefore a description thereof will be omitted.

[0088] In step S25, the control device (C) determines whether the outside air enthalpy (Hoa) is equal to or greater than the exhaust enthalpy (Hea). If the outside air enthalpy (Hoa) is equal to or greater than the exhaust enthalpy (Hea) (YES in step S25), step S27 is executed. If the outside air enthalpy (Hoa) is lower than the exhaust enthalpy (Hea) (NO in step S25), step S26 is executed.

[0089] In step S26, the control device (C) executes the first mode, which promotes the heat release from the double-layered windows (21, 22, 23) where the air temperature is highest. Thereafter, step S25 is executed again.

[0090] In step S27, the control device (C) executes the second mode, after which step S28 is executed.

[0091] In step S28, the control device (C) determines whether the total displacement (Q1+Q2+Q3) is lower than the target displacement Qt. If it is determined that the total displacement (Q1+Q2+Q3) is lower than the target displacement Qt (YES in step S28), step S29 is executed. If it is determined that the total displacement (Q1+Q2+Q3) is greater than the target displacement Qt (NO in step S28), step S27 is executed again.

[0092] In step S29, the control device (C) executes the first mode.

[0093] In step S30, the control device (C) determines whether the total displacement (Q1+Q2+Q3) is equal to the target displacement Qt. If the total displacement (Q1+Q2+Q3) is equal to the target displacement Qt (YES in step S30), step S31 is executed. If the total displacement (Q1+Q2+Q3) is not equal to the target displacement Qt (NO in step S30), step S28 is executed. Note that it is not necessary to determine in step S30 whether the total displacement (Q1+Q2+Q3) is strictly equal to the target displacement Qt. For example, if the total displacement (Q1+Q2+Q3) is within a predetermined range from the target displacement Qt, step S30 may be determined as YES. The predetermined range is, for example, a range from the target displacement Qt to ±1 to 5% of the target displacement Qt.

[0094] Steps S31 to S34 are the same as steps S09 to S12 in the above embodiment, and therefore will not be described further. Note that, if it is determined in step S33 that there is room for further increasing the opening degree of the damper (29) (YES in step S33), step S25 is executed again.

[0095] In this way, in the ventilation system (1) of the second modification, by executing the first mode based on the inside air enthalpy and the exhaust enthalpy, it is possible to obtain the same effects as the ventilation system (1) of the above embodiment.

[0096] (8-2) Variation 2 The ventilation system (1) of the second modification ventilates the indoor space (S) so that the carbon dioxide (CO2) concentration in the indoor space (S) becomes the design CO2 concentration. The ventilation system (1) of the second modification executes the first mode when a third condition is satisfied. The third condition is satisfied when the current CO2 concentration in the indoor space (S) becomes equal to or higher than the target CO2 concentration set for the indoor space (S).

[0097] The ventilation system (1) of the second modification has a CO2 sensor (not shown). The CO2 sensor detects the carbon dioxide concentration in the indoor space (S). In the second modification, a target CO2 concentration is set. The target CO2 concentration is also called a design CO2 concentration. The operation of the exhaust unit (U2) will be described with reference to the drawings.

[0098] Steps S41 to S42 are the same as steps S01 to S02 in the above embodiment, and therefore a description thereof will be omitted.

[0099] In step S43, the control device (C) determines whether the current CO2 concentration Cc in the indoor space (S) is lower than the target CO2 concentration Ct set for the indoor space (S). If Cc is lower than Ct (YES in step S43), step S44 is executed. If Cc is equal to or higher than Ct (NO in step S43), step S45 is executed.

[0100] Step S44 is the same as step S04 in the above embodiment, and therefore a description thereof will be omitted.

[0101] In step S45, the control device (C) executes mode 1. In this way, when the current CO2 concentration Cc is equal to or higher than the target CO2 concentration Ct (NO in step S43), the third condition is met.

[0102] In step S46, the control device (C) determines whether the current CO2 concentration Cc in the indoor space (S) is the same as the target CO2 concentration Ct set for the indoor space (S). If it is determined that Cc is the same as Ct (YES in step S46), step S49 is executed. If it is determined that Cc is not the same as Ct (NO in step S46), step S47 is executed. Note that the current CO2 concentration Cc in the indoor space (S) does not need to be exactly equal to the target CO2 concentration Ct, and step S46 may be determined as YES as long as the current CO2 concentration Cc in the indoor space (S) is within a predetermined range from the target CO2 concentration Ct. The predetermined range is, for example, a range of ±0.1 to 1% from the target CO2 concentration Ct.

[0103] In step S47, the control device (C) determines whether the current CO2 concentration Cc in the indoor space (S) is lower than the target CO2 concentration Ct. If it is determined that the current CO2 concentration Cc in the indoor space (S) is lower than the target CO2 concentration Ct (YES in step S47), step S48 is executed. If it is determined that the current CO2 concentration Cc in the indoor space (S) is equal to or higher than the target CO2 concentration Ct (NO in step S47), step S46 is executed again.

[0104] Steps S48 to S52 are the same as steps S08 to S12 in the above embodiment, and therefore a description thereof will be omitted.

[0105] (8-3) Variation 3 As shown in FIG. 8, the third modification is a control unit (CU) including the control device (C) and temperature sensors (28a, 28b, 28c) in the above-described embodiment and the first and second modifications.

[0106] (8-4) Variation 4 9, the fourth modification is a control system (CS) including the control unit (CU) of the third modification and a damper (29) which is the air volume adjustment mechanism (29) of the above embodiment and modifications 1 to 3. The control device (C) controls the damper (29).

[0107] (9) Other embodiments In the above embodiment and each modification, the control device (C) may control only the exhaust unit (U2). That is, the control device (C) may not control the air supply unit (U1). In this case, the air supply unit (U1) is controlled by a separate control unit, and the control device (C) communicates with that control unit. Furthermore, the control device (C) does not have to be integrated with the air conditioning control unit (C1), and does not have to control the air conditioner (30). In this case, the control device (C) communicates with the air conditioning control unit (C1).

[0108] The first mode may be executed when the difference in air temperature between the air passages (P) of the two double-layered windows (21, 22, 23) is equal to or greater than a predetermined value. Similarly, the second mode may be executed when the difference in air temperature between the air passages (P) of the two double-layered windows (21, 22, 23) is equal to or greater than a predetermined value.

[0109] The first mode may be a mode in which the double-layer windows (21, 22, 23) among the three double-layer windows (21, 22, 23) whose first index is equal to or greater than a first value are preferentially increased in first airflow rate over the double-layer windows (21, 22, 23) whose first index is lower than the first value. That is, when the first index is air temperature, the first airflow rate of the double-layer windows (21, 22, 23) whose air temperature is equal to or greater than a predetermined air temperature (first value) is preferentially increased over the first airflow rate of the double-layer windows (21, 22, 23) whose air temperature is lower than the predetermined air temperature (first value). The first value is a value that is set arbitrarily. When the first index is air temperature, the first value also indicates the air temperature.

[0110] The second mode may be a mode in which the first airflow rate is reduced preferentially for double-layer windows (21, 22, 23) among the three double-layer windows (21, 22, 23) whose first index is equal to or greater than a first value, and for double-layer windows (21, 22, 23) whose first index is lower than the first value. That is, when the first index is air temperature, the first airflow rate is reduced preferentially for double-layer windows (21, 22, 23) whose air temperature is lower than a predetermined air temperature (first value) compared to the first airflow rate for double-layer windows (21, 22, 23) whose air temperature is equal to or greater than a predetermined air temperature (first value). The first value is a value that is set arbitrarily. When the first index is air temperature, the first value also indicates the air temperature.

[0111] The window unit (20) may have two double-layer windows (21, 22, 23), or may have four or more double-layer windows (21, 22, 23). When the window unit (20) has two double-layer windows (a first double-layer window (21) and a second double-layer window (22)), the first mode increases the first airflow rate of the first double-layer window (21) preferentially over that of the second double-layer window (22) when the first index of the first double-layer window (21) is higher than the first index of the second double-layer window (22), or when the first index of the first double-layer window (21) is equal to or greater than a first value and the first index of the second double-layer window (22) is lower than the first value. In addition, in the second mode, when the first index of the first double-layer window (21) is higher than the first index of the second double-layer window (22), or when the first index of the first double-layer window (21) is equal to or greater than the first value and the first index of the second double-layer window (22) is lower than the first value, the first airflow rate of the second double-layer window (22) is reduced preferentially over that of the first double-layer window (21).

[0112] The first index may be any index that indicates the air temperature in the air passage (P) or may be a temperature that correlates with the temperature in the air passage (P). For example, the first index may be the temperature near the inner glass () of each double-glazed window () in the indoor space (). The detector (28) is not limited to the temperature sensor (28) as long as it detects the first index.

[0113] The outside air may be the air outside the indoor space (S).

[0114] In the above embodiment and each modification, control may be performed so that only the first mode is executed and the second mode is not executed.

[0115] Although the embodiments and modifications have been described above, it will be understood that various modifications in form and detail are possible without departing from the spirit and scope of the claims. Furthermore, the above embodiments and modifications may be combined or substituted as appropriate as long as the functionality of the subject matter of this disclosure is not impaired. The terms "first," "second," etc., described above, are used to distinguish the terms to which these terms are attached, and do not limit the number or order of the terms. [Industrial Applicability]

[0116] As described above, the present disclosure is useful for control devices, control units, and control systems. [Explanation of symbols]

[0117] 12 Exhaust fan (exhaust mechanism) 20 Window Unit 21 First double-decker window 21, 22, 23 Double-glazed windows 21a Inner glass 21b Outer glass 22 Second double-decker window 28 Temperature sensor (detection part) 29 Damper (air volume adjustment mechanism) C control device P Air passage S. Indoor space (target space) U2 Exhaust Unit

Claims

1. a window unit (20) having a plurality of double-glazed windows each having an inner glass (21a) facing a target space (S) and an outer glass (21b) facing the outside of the room, wherein an air passage (P) communicating the target space (S) with the outside of the room is formed between the inner glass (21a) and the outer glass (21b); an exhaust mechanism (12) that exhausts air from the target space (S) to the outside through the double-layered windows (21, 22, 23); a control device for controlling an exhaust unit (U2) including an air volume adjustment mechanism (29) for adjusting a first air volume of air passing through the double-layered windows (21, 22, 23), The window unit (20) includes a first double-layer window (21) and a second double-layer window (22), a first mode in which, when an index indicating the temperature of air in the air passage (P) is set to a first index, if the first index of the first double-layer window (21) is higher than the first index of the second double-layer window (22), or if the first index of the first double-layer window (21) is equal to or greater than a first value and the first index of the second double-layer window (22) is lower than the first value, the first airflow rate of the first double-layer window (21) is increased preferentially over that of the second double-layer window (22). Control device.

2. a second mode in which the first airflow rate of the second double-layer window (22) is reduced preferentially over that of the first double-layer window (21) when the first index of the first double-layer window (21) is higher than the first index of the second double-layer window (22), or when the first index of the first double-layer window (21) is equal to or higher than a first value and the first index of the second double-layer window (22) is lower than the first value; The control device according to claim 1 .

3. Execute the first mode when a first condition is met; The first condition is met when the total ventilation volume of the target space (S) through the window unit (20) is equal to or less than a target ventilation volume set for the target space (S). The control device according to claim 1 or 2.

4. When a second condition is satisfied, the first mode is executed; The second condition is met when the enthalpy of the outside air is equal to or greater than the enthalpy of the inside air in the target space (S) that is discharged from the target space (S) to the outside. The control device according to claim 1 or 2.

5. When a third condition is satisfied, the first mode is executed; The third condition is the current CO ２ A target CO concentration is set in the target space (S). ２ This holds true when the concentration is greater than or equal to The control device according to claim 1 or 2.

6. A control unit comprising: the control device according to claim 1 or 2; and a detection section (28) that detects the first indicator.

7. A control system comprising: the control unit according to claim 6; and the air volume adjustment mechanism (29), wherein the control device controls the air volume adjustment mechanism (29).

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