JP2018194252A - Air conditioning system - Google Patents

Abstract

To propose an air conditioning system that allows dehumidification of air with excellent power saving property.SOLUTION: A control device (60) obtains an air temperature corresponding to a contact point between a saturation curve on an air diagram and a linear line passing through a state point of the present room air to perform a processing operation with a target evaporation temperature that is a prescribed temperature equal to or higher than the air temperature, in the dehumidification operation.SELECTED DRAWING: Figure 11

Description

    The present invention relates to an air conditioning system.

    2. Description of the Related Art Conventionally, air conditioning systems that perform indoor air conditioning are known. As this type of air-conditioning system, there is one that performs indoor dehumidification in addition to indoor cooling.

    For example, the air conditioning system described in Patent Document 1 includes a refrigerant circuit to which a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger are connected, and is configured to perform a refrigeration cycle in the refrigerant circuit. . In the air conditioning system, the evaporation temperature of the indoor heat exchanger is lowered during the operation of dehumidifying the room. Thereby, in the indoor heat exchanger, air is cooled to a temperature lower than the dew point temperature, and moisture in the air is condensed. As a result, the room is dehumidified.

Japanese Patent Laid-Open No. 9-14724

    In the air conditioning system as described above, it is conceivable to control the evaporation temperature of the indoor heat exchanger in order to efficiently dehumidify the air. However, in the conventional air conditioning system, no consideration has been given to finely controlling the evaporation temperature.

    Further, if the evaporation temperature of the indoor heat exchanger is too low, air may be dehumidified under low temperature conditions. However, when air is dehumidified under low temperature conditions, the air is dehumidified under conditions where the sensible heat ratio SHF (the ratio of the sensible heat amount to the total heat amount) is large. Therefore, under such conditions, the ratio of the ability (latent heat ability) contributing to dehumidification with respect to the cooling ability is reduced, resulting in a problem that the energy saving property is impaired.

    The present invention has been made in consideration of such problems, and is to propose an air conditioning system capable of dehumidifying air with excellent energy saving performance.

    The first invention includes an indoor unit (30, 50) including an indoor heat exchanger (32, 52), at least one air conditioner (20, 40) having an outdoor unit (21, 41), and the indoor unit In the dehumidifying operation of dehumidifying the room air with the unit (30, 50), the target evaporation temperature of the indoor heat exchanger (32, 52) is obtained, and the evaporation temperature of the indoor heat exchanger (32, 52) is determined by the target evaporation. A control device (60) for controlling the air conditioner (20, 40) so as to approach the temperature, the control device (60) in the dehumidifying operation, a saturation curve on the air diagram and a current An air conditioning system characterized in that an air temperature corresponding to a contact point with a straight line passing through a state point of room air is obtained, and a processing operation is performed in which a predetermined temperature equal to or higher than the air temperature is set as the target evaporation temperature.

    In the first invention, the control device (60) obtains the air temperature corresponding to the contact point between the saturation curve on the air diagram and the straight line passing through the current state point of indoor air. Here, the “state point” corresponds to a point determined by air temperature and humidity on the air diagram. Further, the “air temperature corresponding to the contact point” here does not necessarily have to be obtained by using a map or the like on an air diagram, for example, a function formula for obtaining this air temperature, a table, etc. It may be required even if is used. Then, the control device (60) sets a predetermined temperature equal to or higher than the air temperature as the target evaporation temperature of the indoor heat exchanger (32, 52), and adjusts the air conditioner (20, 20) so that the actual evaporation temperature approaches the target evaporation temperature. 40) control.

    If the temperature lower than the air temperature corresponding to the contact point is set as the target evaporation temperature, the target evaporation temperature becomes excessively low, and air may be dehumidified in a region where the sensible heat ratio is large. On the other hand, in the present invention, since a predetermined temperature equal to or higher than the air temperature corresponding to the contact point is set as the target evaporation temperature, it is possible to reliably avoid dehumidification of air in a region where the sensible heat ratio is large. Thereby, while being able to determine a target evaporation temperature suitably according to the temperature / humidity of the present indoor air, the dehumidification operation excellent in energy-saving property can be performed.

    A second invention is the air conditioning system according to the first invention, wherein the control device (60) sets the air temperature corresponding to the contact as the target evaporation temperature in the processing operation.

    In the second invention, the control device (60) obtains the air temperature corresponding to the contact point between the saturation curve on the air diagram and the straight line passing through the state point corresponding to the current temperature and humidity of the room air. The control device (60) uses the air temperature as the target evaporation temperature of the indoor heat exchanger (32, 52), and controls the air conditioner (20, 40) so that the actual evaporation temperature approaches the target evaporation temperature. To do.

    If the temperature higher than the air temperature corresponding to the contact point is set as the target evaporation temperature, the target evaporation temperature becomes excessively high, so that the dehumidifying ability is lowered. Therefore, especially under conditions where the latent heat load in the room is high, the indoor latent heat cannot be quickly processed, and the comfort in the room is impaired. On the other hand, in this invention, since the air temperature corresponding to the said contact is made into target evaporation temperature, sufficient dehumidification capability is securable. Thereby, while being able to determine a target evaporation temperature suitably according to the temperature / humidity of the present indoor air, the dehumidification operation which made energy saving and comfort compatible can be performed.

    According to a third aspect, in the first or second aspect, the control device (60) includes a first condition indicating that a difference between a current evaporation temperature and a target evaporation temperature is smaller than a predetermined value, and a change in the difference. When one or both of the second conditions for reducing the amount are satisfied, the target evaporation temperature is updated by the processing operation, while when neither the first condition nor the second condition is satisfied, the processing operation is performed. The air conditioning system is characterized in that the update of the target evaporation temperature is prohibited.

    In the third invention, when both the first condition and the second condition are not satisfied, the target evaporation temperature is not updated. That is, when the difference between the current evaporation temperature and the target evaporation temperature is large, it can be determined that the actual evaporation temperature is still changing and has not converged to the target evaporation temperature. Further, even when the amount of change in the difference between the current evaporation temperature and the target evaporation temperature is large, it can be determined that the actual evaporation temperature is still changing. If the target evaporation temperature is updated under such conditions, the evaporation temperature hunts and may not easily converge to the target evaporation temperature. Therefore, when the first condition indicating that the difference between the evaporation temperature and the target evaporation temperature is smaller than the predetermined value is not satisfied, or when the second condition indicating that the change amount of the conference difference is not satisfied, the target evaporation temperature is set. The value is not updated and remains as it is. Thereby, hunting of the evaporation temperature can be prevented.

    In a fourth aspect based on the third aspect, the control device (60) causes the dehumidifying operation to be executed when a condition indicating that indoor humidity is higher than a predetermined value is satisfied. It is.

    In 4th invention, in the temperature / humidity control mode, if the condition which shows that indoor humidity is higher than predetermined value is satisfied, dehumidification operation will be performed. Thereby, the latent heat in the room can be quickly processed.

    5th invention is equipped with the said several air conditioner (20,40) which targets the same room | chamber interior while performing each refrigerating cycle individually in any one of 1st thru | or 4th invention, In the dehumidifying operation, the control device (60) is configured so that the indoor units (30, 50) of all the air conditioners (20, 40) cool the air to the dew point temperature or less. ) On the other hand, after the dehumidifying operation, if a condition indicating that the indoor temperature and humidity are within the target range is satisfied, the indoor unit (30) of at least one air conditioner (20) converts the air to the dew point temperature. The air conditioning system is characterized in that the indoor unit (50) of the other air conditioner (40) is simultaneously operated to cool the air at a temperature higher than the dew point temperature while cooling to the following.

    In the fifth aspect of the invention, when the dehumidifying operation is executed under conditions where the indoor humidity is high, the air is dehumidified in the indoor units (30, 50) of all the air conditioners (20, 40). Thereby, the latent heat in the room can be quickly processed. On the other hand, when the indoor temperature and humidity reach the target range by such dehumidifying operation, the air is dehumidified by at least one air conditioner (20), and only the sensible heat is processed by the other air conditioner (40). Simultaneous operation is executed. In the simultaneous operation, if only some sensible heat is processed by some of the air conditioners (20), the indoor air will not be excessively cooled. Therefore, in the simultaneous operation, the indoor temperature and humidity can be maintained within the target range while saving energy.

    According to the present invention, the target of the indoor heat exchanger (32, 52) is set to a predetermined temperature equal to or higher than the air temperature corresponding to the contact point between the saturation curve on the air diagram and the straight line passing through the current indoor air state point. Since the evaporation temperature is set, it is possible to avoid cooling the air in a region where the sensible heat ratio is large. Therefore, the target evaporation temperature can be determined as appropriate based on the current temperature and humidity of the air, and a dehumidifying operation excellent in energy saving can be realized. In particular, in the second aspect of the invention, the dehumidifying operation that can achieve both energy saving and comfort can be realized by setting the air temperature corresponding to the contact point as the target evaporation temperature.

FIG. 1 is a schematic overall configuration diagram of an air conditioning system according to an embodiment. FIG. 2 is a schematic piping system diagram of the first air conditioner and the second air conditioner of the air conditioning system according to the embodiment. FIG. 3 is a block diagram of the air conditioning system according to the embodiment. FIG. 4 is a flowchart for explaining a flow at the time of shifting to the temperature and humidity control mode of the air conditioning system according to the embodiment. FIG. 5 is a flowchart for explaining a flow of determination operations for each operation in the temperature and humidity control mode of the air conditioning system according to the embodiment. FIG. 6 is an air line diagram for explaining the relationship between the threshold value or region used in the first determination operation at the start of the temperature / humidity control mode and each operation. FIG. 7 is an air line diagram for explaining the relationship between the threshold value or region used in the determination operation during the dehumidifying operation and the non-separation operation, and each operation. FIG. 8 is an air line diagram for explaining a relationship between a threshold value or a region used in a determination operation at the time of a latent-visible separation operation and each operation. FIG. 9 is an air line diagram for explaining the relationship between the threshold value or region used in the determination operation during the sensible heat operation and each operation. FIG. 10 is an air line diagram for explaining the relationship between the threshold value or region used in the determination operation during the latent heat operation and each operation. FIG. 11 is an air diagram for explaining the evaporating temperature determination operation during the dehumidifying operation and the latent heat operation.

    Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its application, or its use.

<Overall configuration of air conditioning system>
The air conditioning system (10) of the present embodiment includes a plurality of air conditioners (20, 40). The plurality of air conditioners (20, 40) target the same indoor space (11) for air conditioning. The air conditioning system (10) of the present embodiment is provided with two air conditioners (a first air conditioner (20) and a second air conditioner (40)). The air conditioning system (10) may include three or more air conditioners. The first air conditioner (20) and the second air conditioner (40) have the same basic configuration. The air conditioning system (10) includes a control device (60) for controlling the air conditioners (20, 40).

<First air conditioner>
As shown in FIGS. 1 and 2, the first air conditioner (20) includes a first outdoor unit (21) installed outdoors and a plurality of first indoor units (30) installed indoors. I have. The plurality of first indoor units (30) are connected in parallel to the first outdoor unit (21) via two communication pipes. The first indoor unit (30) may be one, two, or three or more.

    The first air conditioner (20) includes a first refrigerant circuit (22) filled with a refrigerant. In the first refrigerant circuit (22), the refrigerant circulates to perform a refrigeration cycle. The first refrigerant circuit (22) includes a first compressor (23), a first outdoor heat exchanger (24), a first outdoor expansion valve (25), a first four-way switching valve (26), and a plurality of first One indoor heat exchanger (32) is connected.

    The first compressor (23), the first outdoor heat exchanger (24), the first outdoor expansion valve (25), and the first four-way switching valve (26) are provided in the first outdoor unit (21). The first compressor (23) is an inverter compressor having a variable capacity. The first compressor (23) is configured such that the operation frequency (the number of rotations of the electric motor) can be adjusted by controlling the output of the inverter device. The first outdoor heat exchanger (24) is, for example, a fin-and-tube heat exchanger. A first outdoor fan (27) is provided in the vicinity of the first outdoor heat exchanger (24). In the first outdoor heat exchanger (24), the outdoor air blown by the first outdoor fan (27) and the refrigerant exchange heat. The first outdoor expansion valve (25) is an electronic expansion valve having a variable opening. The first four-way switching valve (26) has first to fourth ports. The first port communicates with the discharge side of the first compressor (23), and the second port communicates with the suction side of the first compressor (23). The third port communicates with the gas side end of the first outdoor heat exchanger (24), and the fourth port communicates with the liquid side end of the first indoor heat exchanger (32). The first four-way switching valve (26) includes a first state (state indicated by a solid line in FIG. 2) in which the first port and the third port communicate and the second port and the fourth port communicate with each other, It is switched to a second state (state indicated by a broken line in FIG. 2) in which the four ports communicate and the second port and the third port communicate.

    One first indoor heat exchanger (32) is provided for each first indoor unit (30). The first indoor heat exchanger (32) is disposed in the air passage in the first indoor unit (30). A first indoor fan (33) is provided in the vicinity (downstream side) of the first indoor heat exchanger (32). In the first indoor heat exchanger (32), the indoor air (intake air) sucked from the indoor space (11) and the refrigerant exchange heat. The air exchanged by the first indoor heat exchanger (32) is supplied to the indoor space (11) as blown air.

    A 1st indoor fan (33) is comprised with a centrifugal fan, for example, and it is comprised so that the air volume of a fan can be adjusted. The air volume of the first indoor fan (33) according to the present embodiment can be switched between three stages of L tap (small air volume), M tap (medium air volume), and H tap (large air volume).

    Each first indoor unit (30) is provided with one first suction temperature sensor (34) and one first suction humidity sensor (35). The first suction temperature sensor (34) detects the temperature of the suction air. The first suction humidity sensor (35) detects the humidity (absolute humidity) of the suction air.

    In the first refrigerant circuit (22), the first refrigeration cycle (cooling cycle) and the second refrigeration cycle (heating cycle) are switched. In the first refrigeration cycle, the first four-way selector valve (26) is in the first state, and the first compressor (23), the first outdoor fan (27), and the first indoor fan (33) are operated. Thus, in the first refrigeration cycle, the refrigerant dissipates heat (condenses) in the first outdoor heat exchanger (24), is decompressed by the first outdoor expansion valve (25), and evaporates in the first indoor heat exchanger (32). To do. In the second refrigeration cycle, the first four-way switching valve (26) is in the second state, and the first compressor (23), the first outdoor fan (27), and the first indoor fan (33) are operated. Thus, in the second refrigeration cycle, the refrigerant dissipates heat (condenses) in the first indoor heat exchanger (32), is depressurized by the first outdoor expansion valve (25), and evaporates in the first outdoor heat exchanger (24). To do.

<Second air conditioner>
As shown in FIG. 2, the second air conditioner (40) includes the same components as the first air conditioner (20). That is, the second air conditioner (40) includes a second refrigerant circuit (42) in which the second outdoor unit (41) and the plurality of second indoor units (50) are connected to circulate the refrigerant.

    The second outdoor unit (41) includes a second compressor (43), a second outdoor heat exchanger (44), a second outdoor expansion valve (45), a second four-way switching valve (46), and a second outdoor unit. A fan (47) is provided. The second indoor unit (50) is provided with a second indoor heat exchanger (52), a second indoor fan (53), a second suction temperature sensor (54), and a second suction humidity sensor (55). In the second refrigerant circuit (42), similarly to the first refrigerant circuit (22), the first refrigeration cycle (cooling cycle) and the second refrigeration cycle (heating cycle) are switched. Since the structure of each apparatus of a 2nd air conditioner (40) is the same as that of a 1st air conditioner (20), detailed description is abbreviate | omitted.

<Remote controller>
As shown in FIG. 1, the first air conditioner (20) is provided with a first remote controller (36). The second air conditioner (40) is provided with a second remote controller (56). Each of the remote controllers (36, 56) is provided on, for example, an indoor wall and is configured to be operable by the user. Each remote controller (36, 56) is provided with an operation unit for performing power ON / OFF of the corresponding air conditioner (20, 40), switching of the operation mode, switching of the direction of the blown air, and the like. Each remote controller (36, 56) is provided with a display unit for displaying the current operation mode, set temperature, set humidity and the like of the corresponding air conditioner (20, 40).

<Control device>
As shown in FIGS. 1 and 3, the air conditioning system (10) includes a control device (60) (control system) for controlling the air conditioners (20, 40). The control device (60) of the present embodiment includes a first local controller (61), a second local controller (71), a communication terminal (80), a router (85), and a cloud server (90).

    The first local controller (61) is provided corresponding to the first air conditioner (20). The first local controller (61) is configured to be able to control each component device of the first refrigerant circuit (22), the first indoor fan (33), and the like. The first local controller (61) is configured using a microcomputer and a memory device (specifically, a semiconductor memory) that stores software for operating the microcomputer.

    The first local controller (61) includes a first capability determining unit (62), a first capability control unit (63), and a first communication unit (64). A 1st capability determination part (62) is a calculating part for determining the capability of a 1st air conditioner (20). A 1st capability control part (63) is a control part for controlling the capability of a 1st air conditioner (20).

    The first communication unit (64) is connected to the Internet (86) via the router (85), and is configured to be able to communicate with the cloud server (90) via the Internet (86). Communication between the first communication unit (64) and the router (85) may be realized by a wired method or may be realized by a wireless method. With such a configuration, signals such as operation commands and control parameters can be exchanged bidirectionally between the first local controller (61) and the cloud server (90).

    The second local controller (71) is provided corresponding to the second air conditioner (40). The second local controller (71) is configured to be able to control each component device of the second refrigerant circuit (42), the second indoor fan (53), and the like. The second local controller (71) is configured using a microcomputer and a memory device (specifically, a semiconductor memory) that stores software for operating the microcomputer.

    The second local controller (71) includes a second capability determining unit (72), a second capability control unit (73), and a second communication unit (74). A 2nd capability determination part (72) is a calculating part for determining the capability of a 2nd air conditioner (40). A 2nd capability control part (73) is a control part for controlling the capability of a 2nd air conditioner (40).

    The second communication unit (74) is connected to the Internet (86) via the router (85) and configured to be able to communicate with the cloud server (90) via the Internet (86). Communication between the second communication unit (74) and the router (85) may be realized by a wired method or a wireless method.

    The communication terminal (80) is a communication device for the user to instruct operation in a temperature and humidity control mode, which will be described in detail later. The communication terminal (80) is configured by, for example, a smartphone or a tablet PC. The communication terminal (80) includes a microcomputer and a memory device (specifically, a semiconductor memory) that stores software for operating the microcomputer. The communication terminal (80) includes a touch panel (81) that also serves as a display unit and an operation unit, and a communication unit (82) that is connected to the cloud server (90) via the Internet (86).

    The communication terminal (80) stores a program (control application) for executing the temperature / humidity control mode. The user operates the touch panel (81) of the communication terminal (80) to switch the temperature / humidity control mode ON / OFF, set the indoor target temperature (Ts) in the temperature / humidity control mode, and set the temperature / humidity control mode. The indoor target humidity (Rs) can be set.

    The cloud server (90) is configured to be capable of bidirectional communication with the first local controller (61), the second local controller (71), and the communication terminal (80) via the Internet (86). The cloud server (90) includes a microcomputer and a memory device (specifically, a semiconductor memory) that stores software for operating the microcomputer.

    The cloud server (90) includes a driving determination unit (91) and a capability determination unit (92). The operation determination unit (91) performs a determination operation for switching various operations (details will be described later) in the temperature and humidity control mode. The capacity determining unit (92) determines the target evaporation temperature of each air conditioner (20, 40) and the speed of the indoor fan (fan tap) in each operation in the temperature / humidity control mode. The cloud server (90) transmits the operation parameters obtained in this way to the local controllers (61, 71) every predetermined time (for example, 20 seconds) via the Internet (86).

-Driving action-
The operation of the air conditioning system (10) will be described in detail.

    In the air conditioning system (10), a temperature control mode and a temperature / humidity control mode can be selected. The temperature control mode is an operation mode for adjusting only the temperature of the indoor air in the indoor space (11), and includes a cooling operation and a heating operation. In the temperature control mode, control is performed so that the temperature of the room air approaches the target value. The temperature / humidity control mode is an operation mode for adjusting the temperature and humidity of the indoor air in the indoor space (11). The temperature / humidity control mode includes 1) dehumidifying operation, 2) non-separation operation, 3) latent sensible separation operation, 4) sensible heat operation, and 5) latent heat operation. In the temperature / humidity control mode, the operations 1) to 5) are automatically switched and executed according to the indoor air condition (temperature and humidity). Details of these operations will be described later.

-Cooling operation in temperature control mode-
The cooling operation in the temperature control mode will be described. In the cooling operation, the first refrigeration cycle described above is performed in each air conditioner (20, 40). That is, the refrigerant compressed by the compressor (23, 43) is condensed by each outdoor heat exchanger (24, 44) and radiated to the outdoor air. The condensed refrigerant is depressurized by the outdoor expansion valves (25, 45) and then flows through the indoor heat exchangers (32, 52). In each indoor heat exchanger (32, 52), the refrigerant absorbs heat from the indoor air and evaporates. Thereby, in each indoor unit (30, 50), intake air is cooled. The evaporated refrigerant is sucked into each compressor (23, 43) and compressed again. The air cooled by each indoor heat exchanger (32, 52) is supplied as blown air to the indoor space (11).

    In the cooling operation, the capacity of each air conditioner (20, 40) is controlled according to the difference ΔT between the temperature of the intake air of each indoor unit (30, 50) and the set temperature. When this ΔT increases, the target evaporation temperature of each air conditioner (20, 40) decreases, and consequently the operating frequency of each compressor (23, 43) increases. Conversely, when ΔT decreases, the target evaporation temperature of each air conditioner (20, 40) increases, and consequently the operating frequency of each compressor (23, 43) decreases.

-Temperature / humidity control mode-
The operation in the temperature / humidity control mode is an operation in which the indoor temperature is brought close to the target temperature (Ts) and the indoor humidity is brought close to the target humidity (Rs). In the temperature / humidity control mode, various operations are switched in accordance with the current air state point (C) so that the current indoor temperature / humidity approaches the target point (S) (see FIG. 6). The temperature / humidity control mode is realized by transmission / reception of signals between the local controllers (61, 71), the cloud server (90), and the communication terminal (80). Transmission / reception of signals between these terminals is performed every predetermined time (for example, 20 seconds).

<Control up to temperature / humidity control mode>
Control up to the transition to the temperature / humidity control mode will be described with reference to FIG. When the user activates the application of the communication terminal (80) and selects “ON” of the “temperature / humidity control mode” on the touch panel (81), this signal is output to the cloud server (90). At the same time, the target temperature (Ts) and target humidity (Rs) set in the communication terminal (80) are input to the cloud server (90). As described above, when there is an instruction to start the temperature / humidity control mode, the process proceeds from step St1 to step St2.

    Next, the cloud server (90) sends the received target temperature (Ts) and target humidity (Rs) to each local controller (61, 71) of each air conditioner (20, 40) or each remote controller (36, 56). ). Each local controller (61, 71) starts each air conditioner (20, 40) using the intake air temperature detected by each air conditioner (20, 40) and the target temperature (Ts) (thermo ON) Judgment is made. Each local controller (61, 71) determines the start-up of each air conditioner (20, 40) using the intake air humidity detected by each air conditioner (20, 40) and the target humidity (Rs). May be performed.

    As described above, when the thermo-ON condition is satisfied, the process proceeds from step St2 to step St3, and the process proceeds to the temperature / humidity control mode.

<First judgment operation>
As shown in FIG. 5, when the mode is shifted to the temperature / humidity control mode, the first determination operation is performed (step St51). In the first determination operation, the operation determination unit (91) determines which of 1) dehumidifying operation, 3) sensible heat operation, 4) sensible heat operation, and 5) latent heat operation is performed. That is, in the first determination operation, 2) non-separation operation is not selected. In the determination operation, the target temperature (Ts) set in the communication terminal (80), the target humidity (Rs) set in the communication terminal (80), and the current air condition in the indoor space (11) are used. . Here, as an index indicating the current air condition, the current air temperature (T) of the indoor space (11), the current air humidity (R) of the indoor space (11), and the current of the indoor space (11) Of discomfort index (DI).

    As the air temperature (T), the highest air temperature (Tmax) among the detected temperatures of the plurality of first suction temperature sensors (34) and the detected temperatures of the plurality of second suction temperature sensors (54) is used. . The air humidity (R) corresponds to the highest air temperature (Tmax) among the detected humidity of the plurality of first suction humidity sensors (35) and the detected humidity of the plurality of second suction humidity sensors (55). The detected humidity. That is, the air temperature (T) and the air humidity (R) correspond to the suction temperature sensor (34, 54) and the suction humidity sensor (35, 55) which are a pair of the same indoor unit (30, 50).

    The discomfort index (DI) is obtained from air temperature (T) and air humidity (R). Here, the discomfort index is one of the thermal indices for representing the thermal sensation of the human body, and can be obtained by a relational expression including temperature and humidity.

    In the determination operation, a plurality of threshold values for determining the shift of each operation are used. These threshold values are determined based on target values of indoor air conditions (that is, target temperature (Ts) and target humidity (Rs)).

    Specifically, when conceptually described with reference to the air diagram of FIG. 6, the operation determination unit (91) is based on the target temperature (Ts), the first temperature threshold (Ts1), the second temperature threshold ( Ts2), a third temperature threshold value (Ts3), a fourth temperature threshold value (Ts4), and a thermo-off determination temperature (Toff) are calculated. The first temperature threshold value (Ts1) is a value obtained by adding a predetermined temperature Δt1 (for example, 0.5 ° C.) to the target temperature (Ts). The second temperature threshold (Ts2) is a value obtained by adding a predetermined temperature Δt2 (for example, 1.5 ° C.) to the target temperature (Ts). The third temperature threshold value (Ts3) is a value obtained by adding a predetermined temperature Δt3 (for example, 2.0 ° C.) to the target temperature (Ts). The fourth temperature threshold value (Ts4) is a value obtained by subtracting a predetermined temperature Δt4 (for example, 0.5 ° C.) from the target temperature (Ts). The thermo-off determination temperature (Toff) is a value obtained by subtracting a predetermined temperature (for example, 2 ° C.) from the target temperature. In the present embodiment, Δt1 and Δt4 are equal.

    The operation determination unit (91) determines the first humidity threshold (Rs1), the second humidity threshold (Rs2), the third humidity threshold (Rs3), and the fourth humidity threshold (Rs4) based on the target humidity (Rs). calculate. Here, the first humidity threshold (Rs1) is a value obtained by adding a predetermined humidity Δr1 (for example, 1.0 g / kg (dry-air)) to the target humidity (Rs). The second humidity threshold (Rs2) is a value obtained by adding a predetermined humidity Δr2 (for example, 2.0 g / kg (dry-air)) to the target humidity (Rs). The third humidity threshold (Rs3) is a value obtained by subtracting a predetermined humidity Δr3 (for example, 1.0 g / kg (dry-air)) from the target humidity (Rs). The fourth humidity threshold (Rs4) is a value obtained by subtracting a predetermined humidity Δr4 (for example, 2.0 g / kg (dry-air)) from the target humidity (Rs). In the present embodiment, Δr1 and Δr3 are equal and Δr2 and Δr4 are equal.

    The driving determination unit (91) calculates a target discomfort index (target discomfort index (DIs1)) for the indoor space (11) from the target temperature (Ts) and the target humidity (Rs). In the air diagram of FIG. 6, the discomfort index increases toward the upper right (the higher the temperature and humidity), and the discomfort index decreases at the lower left (the lower the temperature and humidity). Therefore, in the air diagram, the target discomfort index (Ds1) is a line extending to the upper left, and this target discomfort index (DIs1) is the first discomfort index threshold. Furthermore, the driving determination unit (91) sets a value obtained by adding a predetermined value (for example, 0.5) to the target discomfort index (DIs1) as the second discomfort index threshold (DIs2).

    The operation determination unit (91) compares each threshold as described above with the current air state point (C) (ie, air temperature (T) and air humidity (R)), and shifts to any operation. Judge whether to do.

    Specifically, when the current air state point (C) is within the area E1 surrounded by a thick line, the operation determination unit (91) determines the shift to the latent / visible separation operation. That is, the air temperature (T) is lower than the second temperature threshold value (Ts2), the air humidity (R) is not less than the third humidity threshold value (Rs3), and the air humidity (R) is the first humidity threshold value (Rs1). If it is lower, the shift to the latent-splitting separation operation is determined. The driving determination unit (91) may also be configured when the current air discomfort index (DI) is lower than the target discomfort index (DIs1) and the air humidity (R) is greater than or equal to the third humidity threshold (Rs3). Determine the transition to latent-splitting separation operation.

    The operation determination unit (91) determines the transition to the sensible heat operation when the current air state point (C) is within the region E2 surrounded by a thick line. That is, when the air temperature (T) is equal to or higher than the second temperature threshold (Ts2) and the air humidity (R) is smaller than the first humidity threshold (Rs1), the shift to the sensible heat operation is determined. The operation determination unit (91) also switches to sensible heat operation when the air temperature (T) is lower than the second temperature threshold (Ts2) and the air humidity (R) is lower than the third humidity threshold (Rs3). Determine the migration.

    The operation determination unit (91) determines the transition to the latent heat operation when the current air state point (C) is within the region E3 surrounded by a thick line. That is, the air temperature (T) is lower than the first temperature threshold (Ts1), the air humidity (R) is equal to or higher than the first humidity threshold (Rs1), and the discomfort index (DI) is equal to or higher than the target discomfort index (DIs1). If so, the transition to the latent heat operation is determined.

    An operation | movement determination part (91) determines the transfer to dehumidification operation, when the present air state point (C) exists in the area | region of E4. That is, when the air temperature (T) is equal to or higher than the first temperature threshold (Ts1) and the air humidity (R) is equal to or higher than the first humidity threshold (Rs1), the shift to the dehumidifying operation is determined.

    As shown in FIG. 5, in the present embodiment, after a dehumidifying operation is started in step St56, when a predetermined time (for example, 120 seconds) elapses, the process proceeds to step St57, where the dehumidifying operation is switched to the non-separating operation. It is done.

<Outline of judgment operation after the second>
In the determination operation after the second time (step St58) after shifting to the temperature / humidity control mode, the operation determination unit (91) performs other operations except the dehumidification operation (2) non-separation operation, 3) sensible heat operation, 4 It is determined whether to perform (1) sensible heat operation or (5) latent heat operation). That is, in the temperature / humidity control mode, the dehumidifying operation is executed only in the first determination operation immediately after the start of the temperature / humidity control mode, when the current air is within the E4 region.

    The second and subsequent determination operations are performed at a predetermined time (for example, every 20 seconds) during each operation. The basic criteria for the second and subsequent determination operations are the same as the first determination operation described above. However, in the second and subsequent determination operations, the threshold value for determining the next operation is different from the first determination operation in accordance with the type of the current operation.

<Determining operation during dehumidifying operation / non-separating operation>
The threshold value of the determination operation during the dehumidifying operation and the non-separating operation is as shown in FIG. Although a detailed description is omitted, in these operations, the humidity range of the region E1 corresponding to the latent-visible separation operation is expanded to the lower side (low humidity side) than other determination operations. In these operations, the discomfort index threshold in the range equal to or higher than the first humidity threshold (Rs1) does not exist in the region E1 corresponding to the latent-visible separation operation.

<Determination operation during latent-splitting separation operation>
The threshold value of the determination operation during the latent-visible separation operation is as shown in FIG. Although detailed description is omitted, in the latent sensible separation operation, the region E2 corresponding to the sensible heat operation and the region E3 corresponding to the latent heat operation are smaller than the first determination operation. Further, in the latent-splitting separation operation, when the current air state point (C) is within the region E5, the transition to the non-separation operation is determined. The range of the region E5 in the latent-visible separation operation is smaller than the region E4 (the transition range to the dehumidifying operation) of the first determination operation. As described above, in the determination operation during the latent-splitting separation operation, the region E1 for continuously performing the latent-scientific separation operation is larger than the region E1 of the initial determination operation. Therefore, after a transition from a certain operation to a latent-visible separation operation, it is possible to avoid returning to another operation (so-called hunting) by slightly increasing the air temperature (T) or the air humidity (R).

<Judgment operation of sensible heat operation>
The threshold value of the determination operation during the sensible heat operation is as shown in FIG. Although a detailed description is omitted, in the sensible heat operation, there is a region E6 (a hatched region) that is not included in other determination operations. The region E6 is a region for determining the shift to the non-separation operation, similarly to the region E5. However, in the determination operation during the sensible heat operation, when the air state point (C) is in the region E5, the state immediately shifts to the non-separation operation, whereas the air state point (C) is in the region E6. When this state continues for a predetermined time (for example, 180 seconds), the operation shifts to the non-separation operation. As described above, hunting between the sensible heat operation and the non-separation operation can be avoided by adding the time restriction in the region near the boundary from the sensible heat operation to the non-separation operation.

<Evaluation operation of latent heat operation>
The threshold value of the determination operation during the latent heat operation is as shown in FIG. Although detailed description is omitted, in the latent heat operation, the humidity range of the region E1 corresponding to the latent-scientific separation operation is expanded to the lower side (low humidity side) than the first determination operation.

<Overview of each operation>
Next, each operation executed in the temperature and humidity control mode will be described. The operation in the temperature and humidity control mode includes a first operation in which all of the plurality of air conditioners (20, 40) are latent heat machines, and a part of the plurality of air conditioners (in this example, the first air conditioner ( 20)) becomes a latent heat machine, and another air conditioner (second air conditioner (40) in this example) becomes a sensible heat machine, and a plurality of air conditioners (20,40) (in this example) The first air conditioner (20) and the second air conditioner (40) are roughly divided into a third operation in which all of them are sensible heat machines. The dehumidifying operation, non-separation operation, and latent heat operation are included in the first operation. The latent sensible separation operation corresponds to the second operation, and the sensible heat operation corresponds to the third operation.

    The “latent heat machine” is an air conditioner that is controlled so that the indoor heat exchanger (32, 52) of the indoor unit (30, 50) cools air to a dew point temperature or lower. Therefore, when the air is cooled by the indoor units (30, 50) of the latent heat machine, moisture in the air is condensed and the condensed water is collected in a drain pan or the like. Thereby, in the indoor unit (30, 50) of the latent heat machine, both the temperature and humidity of the air are reduced.

    The “sensible heat machine” is an air conditioner that is controlled so that the indoor heat exchanger (32, 52) of the indoor unit (30, 50) cools the air at a temperature higher than the dew point temperature. Therefore, when air is cooled in the indoor units (30, 50) of the sensible heat machine, moisture in the air is not condensed, and only the temperature of the air is lowered.

<Dehumidifying operation>
The dehumidifying operation is an operation that rapidly reduces the absolute humidity in the room under conditions where the humidity and temperature in the room are high. In the dehumidifying operation, both the first air conditioner (20) and the second air conditioner (40) are latent heat machines.

    When the dehumidifying operation is started, the cloud server (90) transmits a signal for controlling the air volume of the indoor fan (33, 53) of each air conditioner (20, 40) to each local controller (61, 71). . In the dehumidifying operation, a signal for controlling the air volume of the indoor fans (33, 53) to L taps is transmitted. Thereby, in the dehumidifying operation, the air volume of all the indoor fans (33, 53) becomes a small air volume, and the dehumidifying performance of each indoor unit (30, 50) is improved.

    The cloud server (90) appropriately obtains the target evaporation temperature (TeS) of each air conditioner (20, 40), and transmits the obtained target evaporation temperature (TeS) to each local controller (61, 71). Here, in the dehumidifying operation, the target evaporation temperature (TeS) is calculated based on the current air state by the following processing operation (target evaporation temperature determination process). Specifically, the capacity determining unit (92) calculates a target evaporation temperature (TeS) using a function formula stored in the memory. Here, this functional equation is a function including a saturation curve, a current air temperature (T), and a current air humidity (R) shown on the air diagram of FIG. Specifically, as shown in FIG. 11, this functional equation expresses the temperature (Tp) corresponding to the contact point (P) between the saturation curve on the air diagram and the straight line M passing through the current air state point. It is what you want. Here, the current air state point (C) corresponds to the current air temperature (T) and the current air humidity (R). The temperature (Tp) corresponding to the contact (P) is calculated from this function equation, and this temperature (Tp) is set as the target evaporation temperature (TeS). In the dehumidifying operation, the target evaporating temperature determination process is executed every predetermined time (20 seconds) in principle.

    The target evaporation temperature (TeS) obtained in this way is appropriately transmitted to each local controller (61, 71) via the Internet (86). As a result, each air conditioner (20, 40) has an operating frequency of the compressor (23, 43) so that the current evaporation temperature (Te) approaches the target evaporation temperature (TeS) received every predetermined time. To control.

    In the dehumidifying operation, by obtaining the target evaporation temperature (T) in this way, it is possible to prevent the target evaporation temperature (TeS) from being excessively increased or decreased excessively. If the target evaporation temperature (TeS) is too high, the temperature at which air can be cooled becomes high, and the amount of water that can be condensed from air also decreases. For this reason, the room air cannot be quickly dehumidified, and the room temperature and humidity cannot be quickly brought close to the target point (S). As a result, the comfort of the indoor space (11) is impaired.

    On the other hand, if the target evaporation temperature (TeS) is too low, the air is attempted to be dehumidified in a region where the sensible heat ratio of air is large (a region where the slope of the arrow in FIG. In this region, the ratio of latent heat to be processed becomes small with respect to the total amount of heat to be processed, which is a disadvantageous condition for dehumidification. For this reason, if the air is cooled in this region, the latent heat treatment capacity with respect to the cooling capacity is reduced, and consequently, energy saving performance is impaired.

    On the other hand, as shown in FIG. 11, by setting the temperature (Tp) corresponding to the contact (P) as the target evaporation temperature (TeS), the target evaporation temperature (TeS) becomes excessively high or excessively low. Never become. As a result, it is possible to achieve both indoor comfort and energy saving of the air conditioning system (10).

    Note that an upper limit value is set for the target evaporation temperature (TeS) obtained in the dehumidifying operation so that air can be reliably cooled below the dew point temperature in each latent heat machine. Accordingly, in the dehumidifying operation, the air cooled by each latent heat machine does not become higher than the dew point temperature.

    In the dehumidifying operation, as described above, the target evaporation temperature determining process is executed every predetermined time (20 seconds) in principle. However, for the purpose of protecting the compressors (23, 43) and preventing evaporation temperature (Te) hunting, the next update determination is performed before the execution of each target evaporation temperature determination process.

    In the update determination, it is determined whether or not to execute the target evaporation temperature process again. In the update determination, when any one or both of the condition 1-A (first condition) and the condition 1-B (second condition) are satisfied, a target evaporation temperature determination process is performed, and the target evaporation temperature (TeS) is Updated.

1-A: Present | Te-TeS | ≦ E1
1-B: | (present | Te-TeS | -previous | Te-TeS |) | ≤E2
Here, | Te−TeS | is the absolute value of the difference between the current evaporation temperature (Te) and the current target evaporation temperature (TeS). The previous | Te-TeS | corresponds to | Te-TeS | calculated in the update determination immediately before the current update determination. E1 and E2 are preset determination threshold values.

    When the condition 1-A is satisfied, it can be determined that the actual evaporation temperature (Te) has converged to the target evaporation temperature (TeS). Therefore, when the condition 1-A is satisfied, the target evaporation temperature determination process is performed again, and the target evaporation temperature (TeS) is recalculated.

    When the condition 1-B is satisfied, the decreasing change amount of the difference between the evaporation temperature (Te) and the target evaporation temperature (TeS) is small, and the evaporation temperature (Te) tends to converge to the target evaporation temperature (TeS). It can be judged that there is. Therefore, even when the condition 1-B is satisfied, the target evaporation temperature determination process is performed again, and the target evaporation temperature (TeS) is recalculated.

    If neither Condition 1-A nor Condition 1-B is satisfied, it can be determined that the evaporation temperature (Te) has not converged to the target evaporation temperature (TeS) and the evaporation temperature (Te) has changed significantly. Therefore, when these conditions are not satisfied, the target evaporation temperature determination process is prohibited and the target evaporation temperature (TeS) is not recalculated. Thereby, it is possible to restrict the target evaporation temperature (TeS) from being changed again when the evaporation temperature (Te) changes relatively greatly. Therefore, it is possible to avoid the operating frequency of the compressor (23, 43) from changing greatly and the evaporation temperature (Te) from hunting.

<Non-separate operation>
The non-separation operation is an operation for reducing the indoor absolute humidity under conditions of high indoor humidity and temperature, as in the dehumidifying operation. In the non-separation operation, both the first air conditioner (20) and the second air conditioner (40) are latent heat machines. However, as described above, the non-separation operation is not executed in the first determination operation (see FIG. 5). In the non-separation operation, both the first air conditioner (20) and the second air conditioner (40) are latent heat machines.

    When shifting to non-separated operation, the cloud server (90) sends a signal for controlling the air volume of the indoor fan (33,53) of each air conditioner (20,40) to each local controller (61,71) To do. In the non-separated operation, a signal for controlling the air volume of the indoor fans (33, 53) to M taps is transmitted. Thereby, in the non-separation operation, the air volume of all the indoor fans (33, 53) becomes the medium air volume.

    The cloud server (90) appropriately obtains the target evaporation temperature (TeS) of each air conditioner (20, 40), and transmits the obtained target evaporation temperature (TeS) to each local controller (61, 71). Here, the target evaporation temperature (TeS) in the non-separation operation is obtained by a method similar to the cooling operation in the temperature control mode.

    That is, in the evaporating temperature determination process in non-separation operation, the target evaporating temperature (TeS) is calculated according to the difference ΔTrs between the current air temperature (T) and the target temperature (Ts) set in the communication terminal (80). To do. As ΔTrs increases, the target evaporation temperature (TeS) decreases in order to increase the capacity of each air conditioner (20, 40). Conversely, when ΔTrs decreases, the target evaporation temperature (TeS) increases in order to reduce the capacity of each air conditioner (20, 40).

    Note that an upper limit value is set for the target evaporation temperature (TeS) obtained in the non-separation operation so that each latent heat machine can reliably cool the air below the dew point temperature. Therefore, in the dehumidifying operation, the air cooled by each latent heat machine does not become higher than the dew point temperature.

    In the non-separation operation, the update determination as to whether or not to update the target evaporation temperature (TeS) is performed in the same manner as the dehumidification operation. Thereby, while protecting a compressor (23, 43), the hunting of evaporation temperature (Te) can be avoided.

<Latent heat operation>
The latent heat operation is an operation that lowers the absolute humidity in the room, particularly under conditions where the indoor humidity is high. In the latent heat operation, both the first air conditioner (20) and the second air conditioner (40) are latent heat machines. In the latent heat operation, basically the same control as the dehumidifying operation is performed.

    In the latent heat operation, a signal for controlling the air volume of the indoor fans (33, 53) to M taps is transmitted. Thereby, in the latent heat operation, the air volume of all the indoor fans (33, 53) becomes the medium air volume.

    In the evaporating temperature determination process in the latent heat operation, the target evaporating temperature (TeS) is determined from the temperature (Tp) corresponding to the contact (P), as in the dehumidifying operation. However, in the latent heat operation, unlike the dehumidification operation, the update determination of the target evaporation temperature (TeS) is not performed. Therefore, in the latent heat operation, the target evaporation temperature (TeS) is always recalculated every predetermined time (for example, 20 seconds).

    The latent heat operation is executed when the air state point (C) is in the region E3 as described above, and this region E3 is located near the thermo-off region. If the recalculation of the target evaporation temperature (TeS) is prohibited in the latent heat operation as in the dehumidification operation, the air is excessively cooled during this time, and the air temperature (T) becomes the target evaporation temperature (TeS). May be significantly lower than In this case, the air temperature (T) may reach the thermo-off region.

    On the other hand, in the present embodiment, the target evaporation temperature (TeS) is always updated in the latent heat operation, so that the target evaporation temperature (TeS) can be adjusted before the air temperature (T) is excessively cooled. Thereby, it can also be avoided that the air temperature (T) reaches the thermo-off region. Also, in the latent heat operation, the evaporation temperature (Te) tends to converge to the target evaporation temperature (TeS) compared to the dehumidification operation, so the compressor (23, 43) The operating frequency and evaporation temperature (Te) do not vary greatly.

<Overview of latent-splitting separation operation>
In the latent sensible separation operation (simultaneous operation), when the indoor temperature and humidity are in the range close to the target point (S), the latent heat and sensible heat in the room are individually processed by each air conditioner (20, 40). Driving. In the latent and sensible separation operation of this embodiment, the first air conditioner (20) serves as a latent heat machine, and the second air conditioner (40) serves as a sensible heat machine. Therefore, in the latent microscope separation operation, air is cooled and dehumidified by the indoor unit (30, 50) of the first air conditioner (20), and at the same time, the indoor unit (30, 50) of the second air conditioner (40). ) Only cools the air. Thus, by operating the latent heat machine and the sensible heat machine at the same time, the indoor temperature and humidity can be brought close to the target range while avoiding an excessive decrease in the indoor temperature.

    In the latent sensible separation operation, a local controller (first local controller (61) in this example) corresponding to the latent heat machine and a local controller (second local in this example) corresponding to the sensible heat machine are sent from the cloud server (90). It is necessary to send different control signals to the controller (71)). This is because different controls are performed on the sensible heat machine and the latent heat machine. For this reason, the cloud server (90) indicates which air conditioner (20, 40) becomes a latent heat machine and which air conditioner (20, 40) becomes a sensible heat machine when performing the latent sensible separation operation. Device information is registered. In this example, in the latent sensible separation operation, device information indicating that the first air conditioner (20) is a latent heat machine and device information indicating that the second air conditioner (40) is a sensible heat machine include: Registered in the cloud server (90). For example, such information is transmitted from the communication terminal (80) and each local controller (61, 71) to the cloud server (90) via the Internet (86).

<Control of latent heat machine for latent-splitting separation operation>
In the latent microscope separation operation, the cloud server (90) controls the air volume of the first indoor fan (33) to the first local controller (61) corresponding to the first air conditioner (20) that is a latent heat machine. Send the signal. In the latent microscope separation operation, the air volume of the first indoor fan (33) of the first air conditioner (20) is switched between two stages (for example, two stages of L tap and M tap). The first indoor fan (33) may be switched between two stages of M taps and H taps.

    In addition, the cloud server (90) transmits a target evaporation temperature (first target evaporation temperature (TeS1)) for controlling the evaporation temperature (Te) of the first air conditioner (20) to the first local controller (61). To do.

    The evaporating temperature determination process of the latent heat machine in the latent sensible separation operation is obtained by a method similar to the dehumidifying operation. Specifically, the capacity determining unit (92) sets the temperature corresponding to the saturation curve on the air diagram and the straight contact point passing through the target point (S) as the first target evaporation temperature (TeS1). In other words, in the dehumidifying operation, the current air state point (C) (that is, the air temperature (T) and the air humidity (R)) is used to obtain the contact point with the saturation curve, while in the latent microscope separation operation. They differ in that they use a target point (S) (ie, target temperature (Ts) and target humidity (Rs)). Since the target point (S) is determined by the set value of the communication terminal (80), it basically does not change like the state point (C). Therefore, by obtaining the contact point based on the target point (S), the first target evaporation temperature (TeS1) does not vary greatly. Accordingly, it is possible to avoid the current air state point (C) from deviating from the region E1 in FIG. 8 due to such fluctuations in the first target evaporation temperature (TeS1). It can suppress switching to the driving | operation of.

    In the evaporating temperature determination process of the latent heat machine in the latent sensible separation operation, the update determination is performed in the same manner as the dehumidifying operation. Thereby, while protecting a compressor (23,43), the hunting of evaporation temperature (Te) can be prevented.

    Although detailed explanation is omitted, in the latent microscope separation operation, the current air state point (C), target point (S), and air state point (C) (air temperature (T) and air humidity (R) ), The first target evaporation temperature (TeS1) of the latent heat machine is adjusted stepwise.

<Control of the sensible heat machine for latent-splitting separation operation>
In the latent sensible separation operation, the cloud server (90) controls the air volume of the second indoor fan (53) to the second local controller (71) corresponding to the second air conditioner (40) which is a sensible heat machine. Send the signal. In the latent microscope separation operation, the air volume of the second indoor fan (53) of the second air conditioner (40) is controlled to, for example, an M tap or an H tap.

    The cloud server (90) uses the second local controller (71) to control the evaporation temperature (Te) of the second air conditioner (40) (target evaporation temperature (TeS) (second target evaporation temperature (TeS2)) Send.

    In the evaporation temperature determination process of the sensible heat machine in the latent sensible separation operation, the second target evaporation temperature (TeS2) is determined so that the air processed by the sensible heat machine becomes higher than the dew point temperature. Specifically, the dew point temperature (Tdew-s) corresponding to this air is calculated from the air state point (target temperature (Ts) and target humidity (Rs)) corresponding to the current target point (S). That is, the dew point temperature (Tdew-s) is a temperature at which dew condensation occurs from the air when the air at the target point (S) is cooled. In the evaporation temperature determination process, the dew point temperature (Tdew-s) is set as the second target evaporation temperature (TeS2).

    The latent-splitting separation operation is executed when the current air state point (C) is in the region E1 including the target point (S). Therefore, there is no significant difference in air temperature and humidity between the current air state point (C) and the target point (S). In addition, the air cooled by the second indoor heat exchanger (52) of the sensible heat machine cannot substantially be cooled to a temperature equal to or lower than the evaporation temperature. For this reason, by setting the dew point temperature (Tdew-s) corresponding to the target point (S) as the second target evaporation temperature (TeS2), the sensible heat machine has substantially higher air temperature than the actual dew point temperature. To be cooled.

    Here, since the target point (S) is determined by the set value of the communication terminal (80), it basically does not change like the state point (C). Accordingly, by obtaining the dew point temperature based on the target point (S), the second target evaporation temperature (TeS2) does not vary greatly. As a result, it is possible to avoid that the current air state point (C) deviates from the region E1 in FIG. 8 due to such a variation in the second target evaporation temperature (TeS2). Switching to another operation can be suppressed.

<Sensible heat operation>
The sensible heat operation is an operation that lowers the indoor temperature, particularly under conditions where the indoor temperature is high. In the sensible heat operation, both the first air conditioner (20) and the second air conditioner (40) are sensible heat machines.

    When shifting to sensible heat operation, the cloud server (90) sends a signal for controlling the air volume of the indoor fans (33, 53) of each air conditioner (20, 40) to each local controller (61, 71). To do. In the sensible heat operation, a signal for controlling the air volume of the indoor fans (33, 53) to M taps is transmitted. Thereby, in the sensible heat operation, the air volume of all the indoor fans (33, 53) becomes the medium air volume.

    The cloud server (90) transmits a target evaporation temperature (TeS) for controlling the evaporation temperature (Te) of each air conditioner (20, 40) to each local controller (61, 71).

    In the evaporating temperature determination process in the latent sensible operation, the target evaporating temperature (TeS) is determined so that the air processed by the sensible heat machine becomes higher than the dew point temperature. Specifically, the dew point temperature (Tdew-c) corresponding to this air is calculated from the current air state point (C) (air temperature (T) and air humidity (R)). That is, the dew point temperature (Tdew-c) is a temperature at which dew condensation occurs from the air when the air at the current state point is cooled. In the evaporation temperature determination process, the dew point temperature (Tdew-c) is set as the second target evaporation temperature (TeS2).

    The sensible heat operation is executed when the current air state point (C) is in a region E2 away from the target point (S). Therefore, the current air state point (C) is at a relatively higher temperature than the target point (S). For this reason, in the sensible heat operation, unlike the latent heat control in the latent sensible separation operation, the target dew point temperature (Tdew-c) corresponding to the current air state point (C) is used instead of the target point (S). Evaporation temperature (TeS). In other words, in sensible heat operation, if the dew point temperature (Tdew-s) corresponding to the target point (S) is the target evaporation temperature, the target evaporation temperature (TeS) becomes excessively low, and the air is below the actual dew point temperature. May be cooled down to In contrast, in sensible heat operation, the dew point temperature (Tdew-c) corresponding to the current air state point (C) is set as the target evaporation temperature (TeS), so that air is dehumidified in sensible heat operation. Can be reliably prevented.

<Thermo-off operation>
In each operation described above, in principle, when the detected temperature of each suction temperature sensor (34, 54) of each air conditioner (20, 40) falls below the thermo-off determination temperature (Toff), the corresponding indoor unit (30, 50) is thermo-off.

    However, in the latent microscope separation operation, at least until the detected temperatures of all the suction temperature sensors (34, 54) of the plurality of indoor units (30, 50) in operation are below the thermo-off determination temperature (Toff) Thermo-off of indoor units (30, 50) is prohibited. Therefore, in the latent microscope separation operation, even if only the detection temperature of the suction temperature sensor (34, 54) of some indoor units (30, 50) is equal to or lower than the thermo-off determination temperature (Toff), the indoor units (30, 50) 50) do not thermo-off.

    In the latent sensible separation operation, the temperature of the blown air differs between the sensible heat machine and the latent heat machine. For this reason, in the indoor space (11), temperature unevenness is likely to occur, and due to this, the detection temperature of the suction temperature sensor (34, 54) of some indoor units (30, 50) becomes extremely low. There is a possibility that the latent-splitting operation cannot be continued. On the other hand, by performing the above-described thermo-off determination, the latent microscope separation operation can be continued until the entire temperature of the indoor space (11) becomes equal to or lower than the thermo-off determination temperature.

-Effect of the embodiment-
In the dehumidifying operation and the latent heat operation described above, the air corresponding to the contact point (P) between the saturation curve on the air diagram and the straight line passing through the current indoor air state point (C) is determined by the capacity determining unit (92). The temperature (Tp) is obtained, and the indoor heat exchanger (32, 52) becomes the target evaporation temperature (TeS) using this air temperature (T) (see FIG. 11). Thereby, it is possible to reliably avoid dehumidification of air in a region where the sensible heat ratio is large (a region indicated by an arrow a in FIG. 11). Thereby, while being able to determine a target evaporation temperature suitably according to the temperature / humidity of the present indoor air, the dehumidification operation excellent in energy-saving property can be performed.

    Further, by setting the air temperature (Tp) corresponding to the contact (P) as the target evaporation temperature (TeS), it is possible to reliably avoid the target evaporation temperature (TeS) from becoming excessively high. Thereby, sufficient dehumidifying ability of air can be secured and indoor comfort can be secured.

    In particular, since the dehumidifying operation is performed under a condition where the latent heat load is high, such latent heat can be quickly processed, and indoor comfort can be quickly satisfied.

    Further, in the dehumidifying operation, when neither the above-described condition 1-A or condition 1-B is satisfied, the update of the target evaporation temperature (TeS) is prohibited. As a result, it is possible to avoid the target evaporation temperature (TeS) from changing even though the evaporation temperature (Te) varies greatly. Thereby, while suppressing the hunting of evaporation temperature (Te), it can also avoid that the operating frequency of a compressor (23,43) changes a lot.

    On the other hand, in the latent heat operation performed in the region E3 (see, for example, FIG. 10) close to the thermo-off region, the target evaporation temperature (TeS) is always updated, and the above-described condition determination is not performed. In this way, it is possible to prevent the air temperature (T) from reaching the thermo-off region due to the prohibition of the update of the target evaporation temperature (TeS), and the frequency of start / stop of the indoor unit (30, 50) Can be reduced.

<< Other Embodiments >>
In the above embodiment, in the dehumidifying operation of the air conditioning system (10) having a plurality of air conditioners (20, 40), the target evaporation temperature (Tp) corresponding to the contact (P) shown in FIG. TeS) has been determined. However, the same target evaporation temperature (TeS) determination method may be adopted in the air conditioning system (10) that performs the dehumidifying operation with only one air conditioner (20, 40).

    In the dehumidifying operation, the target evaporation temperature (TeS) obtained by adding a predetermined temperature to the air temperature (Tp) corresponding to the contact (P) shown in FIG. 11 may be used. That is, the target evaporation temperature (TeS) determined here may be equal to or higher than the air temperature (Tp) corresponding to the contact (P). Even if it does in this way, it can avoid dehumidifying air in the area | region where a sensible heat ratio is large, and can implement | achieve the dehumidification driving | operation excellent in energy-saving property.

    The control device (60) of the above embodiment includes a cloud server (90), a communication terminal (80), and the like, and realizes a temperature / humidity control mode via the Internet (86). However, the control device (60) may control the air conditioner (20, 40) only by a local controller without using the Internet.

    Moreover, although the air conditioning system (10) of the said embodiment is comprised by the two air conditioners (20,40) which target the same indoor space (11), an air conditioner (20,40) May be three or more. Also in this case, in the latent and sensible separation operation, which air conditioner becomes the latent heat machine and which air conditioner becomes the sensible heat machine is registered in advance. In the latent and sensible separation operation, the ratio between the latent heat machine and the sensible heat machine is determined based on the registered information.

    In the air conditioning system (10) of the above-described embodiment, the air conditioner may be a so-called multi-type for buildings in which three or more indoor units are provided and an indoor expansion valve is provided in a refrigerant circuit in the indoor unit. .

    As described above, the present invention is useful for an air conditioning system.

DESCRIPTION OF SYMBOLS 10 Air conditioning system 20 1st air conditioner 21 1st outdoor unit 30 1st indoor unit 40 2nd air conditioner 41 2nd outdoor unit 50 2nd indoor unit 60 Control apparatus

Claims (5)

At least one air conditioner (20, 40) having an indoor unit (30, 50) including an indoor heat exchanger (32, 52) and an outdoor unit (21, 41);
In the dehumidifying operation in which the indoor air is dehumidified by the indoor unit (30, 50), the target evaporation temperature of the indoor heat exchanger (32, 52) is obtained, and the evaporation temperature of the indoor heat exchanger (32, 52) is A control device (60) for controlling the air conditioner (20, 40) so as to approach the target evaporation temperature,
In the dehumidifying operation, the control device (60) obtains an air temperature corresponding to a contact point between a saturation curve on an air diagram and a straight line passing through a current indoor air state point, and is equal to or higher than the air temperature. An air conditioning system that performs a processing operation with a temperature as the target evaporation temperature. In claim 1,
The air conditioning system characterized in that the control device (60) sets the air temperature corresponding to the contact point as the target evaporation temperature in the processing operation. In claim 1 or 2,
The control device (60) is either one of a first condition indicating that a difference between a current evaporation temperature and a target evaporation temperature is smaller than a predetermined value and a second condition where a change amount of the difference is reduced, or When both are satisfied, the target evaporation temperature is updated by the processing operation, while when neither the first condition nor the second condition is satisfied, the update of the target evaporation temperature by the processing operation is prohibited. Air conditioning system. In claim 3,
The control device (60) performs the dehumidifying operation when a condition indicating that indoor humidity is higher than a predetermined value is satisfied. In any one of Claims 1 thru | or 4,
A plurality of the air conditioners (20, 40) each performing a refrigeration cycle and targeting the same room as each other,
The control device (60)
In the dehumidifying operation, while the indoor units (30, 50) of all the air conditioners (20, 40) control the air conditioners (20, 40) so as to cool the air to the dew point temperature or lower,
After the dehumidifying operation, when the condition indicating that the indoor temperature and humidity are within the target range is satisfied, the indoor unit (30) of at least one air conditioner (20) cools the air to the dew point temperature or less and The air conditioner is characterized in that the indoor unit (50) of the air conditioner (40) of the air conditioner performs simultaneous operation for cooling the air at a temperature higher than the dew point temperature.

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