WO2021181486A1 - Air conditioning system, air conditioning control device, air conditioning method, and program - Google Patents

Abstract

An air conditioning system (1000) comprises: a ceiling temperature measurement unit that measures the surface temperature of the ceiling in an indoor space (1001) to be air-conditioned; a floor temperature measurement unit that measures the surface temperature of the floor in the indoor space (1001); and an airflow generation unit (130) that generates a first airflow when the temperature difference between the surface temperature of the ceiling and the surface temperature of the floor is smaller than a first threshold, and generates a second airflow different from the first airflow when the temperature difference is larger than the first threshold.

Description

Air conditioning system, air conditioning controller, air conditioning method and program

This disclosure relates to air conditioning systems, air conditioning controllers, air conditioning methods and programs.

In recent years, with the improvement of the heat insulation performance of buildings such as houses, it has become possible to maintain a comfortable thermal environment to some extent even in spaces with high ceilings such as atriums and high ceilings. However, in such a space, air moves in the vertical direction. For example, in winter, cold air from a window located on the second floor of an atrium space descends to the first floor. In addition, the warm air supplied from the air conditioner rises to a higher position than the person in the atrium space. As a result, there is a temperature difference between the top and bottom of the space. Therefore, it is conceivable to use a technique for reducing the temperature difference between the upper and lower sides (see, for example, Patent Document 1). Patent Document 1 describes an air conditioner that detects the temperature of the sucked air, detects the temperature of the floor surface with an infrared sensor, and controls the blown air flow based on the detection information.

Japanese Unexamined Patent Publication No. 3-260546

When a general air conditioner including a wall-mounted type, a floor-standing type, and other types is installed in a space with a high ceiling height, it is difficult to accurately detect the temperature difference between the upper and lower sides by the same method as in Patent Document 1. become. Specifically, the height at which the wall-mounted air conditioner is installed is usually about 2 m from the floor surface. For example, the temperature near the ceiling in a space with a ceiling height of 5 to 6 m is replaced by the suction temperature of the air conditioner. Then, it is considered that a large error occurs. In addition, there are many cases where the window is located higher than the wall-mounted air conditioner, and if the cold air from the window enters the suction port of the air conditioner, the temperature difference between the upper and lower parts may be estimated to be smaller than the actual value. Therefore, in a general air conditioner, there is a possibility that the same method as in Patent Document 1 cannot reduce the temperature difference between the upper and lower parts generated in a space having a high ceiling height.

The purpose of this disclosure is to reduce the temperature difference between the top and bottom of a space with a high ceiling height.

In order to achieve the above object, the air conditioning system of the present disclosure includes a ceiling temperature measuring means for measuring the surface temperature of the ceiling in the indoor space to be air-conditioned, a floor temperature measuring means for measuring the surface temperature of the floor in the indoor space, and the like. When the temperature difference between the ceiling surface temperature measured by the ceiling temperature measuring means and the floor surface temperature measured by the floor temperature measuring means is smaller than the first threshold value, the first airflow is generated, and the temperature difference is the first threshold value. It is provided with an airflow generating means for generating a second airflow different from the first airflow when the temperature is larger.

According to the present disclosure, the airflow generating means generates a first airflow when the temperature difference between the ceiling surface temperature and the floor surface temperature is smaller than the first threshold value, and when the temperature difference is larger than the first threshold value. , Generates a second airflow that is different from the first airflow. It can be said that the surface temperature of the ceiling is approximately equal to the temperature of the air near the ceiling, and the surface temperature of the floor is approximately equal to the temperature of the air near the floor. Therefore, even if it is difficult to measure the air temperature near the ceiling and floor in a space with a high ceiling height, the air in the indoor space is agitated by the second air flow when there is a temperature difference between the top and bottom in the space. Will be done. As a result, it is possible to reduce the temperature difference between the upper and lower parts generated in a space having a high ceiling height.

The figure which shows the structure of the air-conditioning system which concerns on Embodiment 1. The figure which shows the overview of the indoor unit which concerns on Embodiment 1. The figure for demonstrating the adjustment of the wind direction which concerns on Embodiment 1. Flow chart showing the heating process according to the first embodiment The figure for demonstrating the operation mode which concerns on Embodiment 1. The first figure which shows the example of the transition of the surface temperature which concerns on Embodiment 1. The second figure which shows the example of the transition of the surface temperature which concerns on Embodiment 1. The figure which shows the relationship between the transition of the surface temperature and the operation mode which concerns on Embodiment 1. The figure which shows the structure of the air-conditioning system which concerns on Embodiment 2. The figure which shows the structure of the air-conditioning system which concerns on Embodiment 3. The figure which shows the overview of the indoor unit which concerns on Embodiment 3. The figure which shows the airflow generated in Embodiment 3. The first figure which shows the refrigerating cycle which concerns on Embodiment 3. The second figure which shows the refrigerating cycle which concerns on Embodiment 3. FIG. 3 shows a refrigeration cycle according to the third embodiment. FIG. 4 shows a refrigeration cycle according to the third embodiment.

Hereinafter, the air conditioning system 1000 according to the embodiment will be described in detail with reference to the drawings.

Embodiment 1.
FIG. 1 shows the configuration of the air conditioning system 1000 according to the present embodiment. The air conditioning system 1000 is a system that harmonizes the air in the indoor space 1001 to be air-conditioned by a vapor compression type heat pump. The indoor space 1001 is a specific room in a building represented by a house, an office, or a factory. However, the indoor space 1001 may be an underground space or a space inside a moving body represented by a vehicle or a ship. Further, a part of the indoor space 1001 may communicate with the outside air. In the following, an example will be mainly described in which the indoor space 1001 is an atrium living room provided in a house, and a heating operation is performed in which a difference between the air temperature near the ceiling and the air temperature near the floor is likely to occur. .. The air conditioning system 1000 generates an air flow that agitates the air in the indoor space 1001 when at least one of the warm air near the ceiling and the cold air near the floor surface of the indoor space 1001 stays, thereby causing a temperature difference between the upper and lower sides. To reduce. In FIG. 1, the airflow that agitates the air is indicated by a white arrow, and the airflow that is generated for the purpose of normal air conditioning rather than agitation of the air is indicated by a hatched arrow.

As shown in FIG. 1, the air conditioning system 1000 has an outdoor unit 110 and an indoor unit 120 connected by a refrigerant pipe 101, and a terminal 20 for a user to set a target temperature.

The refrigerant pipe 101 includes a copper pipe for circulating the refrigerant between the outdoor unit 110 and the indoor unit 120, and a protective member for preventing corrosion of the copper pipe and absorption and heat dissipation of the refrigerant. The refrigerant is, for example, R410A or R32, which is an HFC (Hydro Fluoro Carbons) refrigerant. However, the material of the refrigerant pipe and the type of the refrigerant are not limited to this, and are arbitrary.

The outdoor unit 110 is installed outside the house having the indoor space 1001 inside. For example, the outdoor unit 110 is installed on the outer wall surface or roof of the house. The outdoor unit 110 includes a compressor 111 that compresses the refrigerant, an outdoor heat exchanger 112 that exchanges heat between the outside air and the refrigerant, an outdoor blower 113 that blows air to the outdoor heat exchanger 112, and a variable opening degree. It has an expansion valve 114 and. The compressor 111, the outdoor heat exchanger 112, and the expansion valve 114 are connected by a refrigerant pipe 101.

The compressor 111 is, for example, a scroll compressor, a rotary compressor, or a device that compresses the refrigerant by another method. The compressor 111 compresses the refrigerant vapor that has flowed from the outdoor heat exchanger 112 into the suction port via the refrigerant pipe 101, and discharges the high-temperature and high-pressure refrigerant vapor from the discharge port. The refrigerant vapor discharged by the compressor 111 is sent to the indoor heat exchanger 131 of the indoor unit 120 via the refrigerant pipe 101. The compressor 111 operates according to a control signal transmitted from the control unit 140 of the indoor unit 120, and the operating frequency of the compressor 111 is specified by this control signal.

The outdoor heat exchanger 112 is connected to the compressor 111 and the expansion valve 114 via the refrigerant pipe 101, and sends out the refrigerant flowing in from the expansion valve 114 to the compressor 111. The outdoor heat exchanger 112 exchanges heat between the outside air and the refrigerant to evaporate the inflowing refrigerant and discharge the refrigerant vapor during the heating operation. Specifically, the outdoor heat exchanger 112 functions as an evaporator, so that the refrigerant absorbs heat.

The outdoor blower 113 includes a fan and an electric motor for rotating the fan, and is arranged in the vicinity of the outdoor heat exchanger 112. The outdoor blower 113 rotates the fan according to the control signal transmitted from the control unit 140 to generate an air flow that flows in from the outside of the outdoor unit 110 and passes through the outdoor heat exchanger 112. The air heat exchanged by the outdoor heat exchanger 112 is cooled and discharged to the outside of the outdoor unit 110. The air volume of the outdoor blower 113 corresponds to the rotation speed of the fan and is specified by a control signal from the control unit 140.

The expansion valve 114 is a decompressor whose opening degree can be continuously changed by a built-in pulse motor. The expansion valve 114 is connected to the outdoor heat exchanger 112 and the indoor heat exchanger 131 of the indoor unit 120 via the refrigerant pipe 101, and sends the refrigerant flowing from the indoor heat exchanger 131 to the outdoor heat exchanger 112. The expansion valve 114 reduces the pressure applied to the inflowing refrigerant to expand the refrigerant, and discharges the refrigerant having a lower temperature and lower pressure than the inflowing refrigerant. The temperature and pressure of the refrigerant discharged from the expansion valve 114 change according to the opening degree of the expansion valve 114. The opening degree of the expansion valve 114 is specified by the number of pulses of the control signal transmitted from the control unit 140.

The indoor unit 120 is a wall-mounted room air conditioner that is installed on the wall of the indoor space 1001 and harmonizes the air of the indoor space 1001 by blowing warm air. The indoor unit 120 acquires information indicating measurement results from the airflow generation unit 130 that generates the airflow supplied to the indoor space 1001, the control unit 140 that controls each component of the air conditioning system 1000, and the sensors 161 to 163. The acquisition unit 150, the infrared sensor 161 that measures the surface temperature of the ceiling in the indoor space 1001, the temperature sensor 162 that measures the temperature of the air sucked in to generate the air flow, and the surface temperature of the floor in the indoor space 1001. It has an infrared sensor 163 for measurement and a notification unit 170 for notifying the user of various information. In FIG. 1, the broken line connected to the control unit 140 and the broken line connected to the acquisition unit 150 indicate a signal line.

The airflow generation unit 130 includes an indoor heat exchanger 131 that exchanges heat between the air in the indoor space 1001 and the refrigerant, and an indoor blower 132 that blows the air heat exchanged by the indoor heat exchanger 131 into the indoor space 1001. It also has a wind direction adjusting unit 133 that adjusts the wind direction of the airflow supplied to the indoor space 1001 by the indoor blower 132. In the airflow generation unit 130, the temperature difference between the ceiling surface temperature measured by the infrared sensor 161 as the ceiling temperature measuring means and the floor surface temperature measured by the infrared sensor 163 as the floor temperature measuring means in the air conditioning system 1000. Corresponds to an example of an airflow generating means that generates a first airflow when is smaller than the first threshold value and generates a second airflow different from the first airflow when the temperature difference is larger than the first threshold value.

The indoor heat exchanger 131 is connected to the compressor 111 and the expansion valve 114 of the outdoor unit 110 via the refrigerant pipe 101, and sends the refrigerant flowing from the compressor 111 to the expansion valve 114. The indoor heat exchanger 131 exchanges heat between the air and the refrigerant in the indoor space 1001 to condense the inflowing refrigerant and discharge the liquefied refrigerant during the heating operation. Specifically, when the indoor heat exchanger 131 functions as a condenser, the refrigerant dissipates heat and the air in the indoor space 1001 is heated.

The indoor blower 132 has the same configuration as the outdoor blower 113, and is arranged in the vicinity of the indoor heat exchanger 131. However, the fan of the indoor blower 132 is, for example, a cross flow fan or a propeller fan. In the overview of the indoor unit 120 shown in FIG. 2, the indoor blower 132 which is a cross flow fan is exemplified. The indoor blower 132 rotates the fan according to the control signal transmitted from the control unit 140 to generate an air flow that flows from the indoor space 1001 into the indoor unit 120 and passes through the indoor heat exchanger 131. The air heat exchanged by the indoor heat exchanger 131 is heated and blown from the air outlet of the indoor unit 120 to the indoor space 1001. The air volume of the indoor blower 132 corresponds to the rotation speed of the fan and is specified by a control signal from the control unit 140. The indoor blower 132 corresponds to an example of blower means for generating the first airflow and the second airflow in the airflow generation unit 130 of the air conditioning system 1000.

The wind direction adjusting unit 133 includes one or a plurality of wind direction adjusting plates for adjusting the wind direction in the vertical direction, and a motor for changing the angle of the wind direction adjusting plates. In FIG. 2, flaps 1331, 1332, 1333, and 1334 attached to the air outlet 180 as a wind direction adjusting plate are illustrated. The angle of these wind direction adjusting plates is changed in conjunction with the control signal transmitted from the control unit 140, so that the wind direction adjusting unit 133 adjusts the wind direction of the airflow supplied to the indoor space 1001. FIG. 3 schematically shows five-step angles of the flaps constituting the wind direction adjusting unit 133. As shown in FIG. 3, the wind direction adjusting unit 133 follows any one of five stages from the horizontal "vertical wind direction 1" to the vertically downward "vertical wind direction 5" according to the instruction from the control unit 140. Adjust the wind direction in one direction. For example, when the wind direction is increased by one step from the "vertical wind direction 3", the wind direction is adjusted to the "vertical wind direction 4".

Returning to FIG. 1, the infrared sensors 161 and 163 include, for example, elements typified by a thermopile and a bolometer that detect infrared rays. The infrared sensor 161 measures the surface temperature of the ceiling by detecting infrared rays incident from above. The infrared sensor 163 measures the surface temperature of the floor by detecting infrared rays incident from below. The incident direction of infrared rays detected by the infrared sensors 161 and 163 may be adjustable after the indoor unit 120 is installed. The infrared sensors 161 and 163 transmit surface temperature information indicating the measured value of the surface temperature to the acquisition unit 150. Further, the infrared sensors 161 and 163 may be integrally formed. For example, by periodically changing the posture of a single sensor and alternately switching the incident direction of infrared rays detected by the sensor between upward and downward directions, the sensor functions as both infrared sensors 161 and 163. May be demonstrated. FIG. 2 illustrates one sensor 160 that exhibits the functions of the infrared sensors 161 and 163. In the air conditioning system 1000, the infrared sensor 161 corresponds to an example of a ceiling temperature measuring means for measuring the surface temperature of the ceiling in the indoor space to be air-conditioned, and the infrared sensor 163 measures the surface temperature of the floor in the indoor space. It corresponds to an example of a temperature measuring means. The air conditioning system 1000 may be configured by a ceiling temperature measuring unit and a floor temperature measuring unit that measure the surface temperature by a method different from that of the infrared sensors 161 and 163.

The temperature sensor 162 is arranged in the vicinity of the air suction port 181 of the indoor unit 120 as shown in FIG. The sensor 162 measures the temperature of the air sucked into the indoor unit 120 as the temperature of the air in the indoor space 1001, and transmits the room temperature information indicating the measured value to the acquisition unit 150. The temperature sensor 162 corresponds to an example of a room temperature measuring means for measuring the temperature of air in the indoor space 1001 in the air conditioning system 1000.

The acquisition unit 150 includes an interface circuit for acquiring information from each sensor. The acquisition unit 150 acquires surface temperature information from the infrared sensors 161 and 163, acquires room temperature information from the temperature sensor 162, and acquires target temperature information indicating a target room temperature set by the user from the terminal 20. FIG. 2 illustrates an infrared transmission / reception unit 151 for the acquisition unit 150 to communicate with the terminal 20. Then, the acquisition unit 150 transmits the acquired information to the control unit 140. The acquisition unit 150 corresponds to an example of acquisition means for acquiring target temperature information indicating the target temperature of air in the indoor space 1001 in the air conditioning system 1000, and measures the surface temperature of the ceiling in the indoor space and the floor in the indoor space. It corresponds to an example of the acquisition means for acquiring the measured value of the surface temperature of.

The control unit 140 is a computer including a microprocessor, a RAM (Random Access Memory), and an EEPROM (Electrically Erasable Programmable Read-Only Memory). When the microprocessor constituting the control unit 140 executes the program P1 stored in the EEPROM, the control unit 140 exerts various functions. That is, the control unit 140 uses the operating frequency of the compressor 111, the air volume of the outdoor blower 113, the opening degree of the expansion valve 114, the air volume of the indoor blower 132, and the wind direction adjusting unit 133 based on the information received from the acquisition unit 150. The specified wind direction is controlled as appropriate. The control unit 140 controls each component of the air conditioning system 1000 to execute the heating operation of the air conditioning system 1000. The control unit 140 causes the airflow generating means to generate the first airflow when the temperature difference between the measured value of the ceiling surface temperature and the measured value of the floor surface temperature is smaller than the threshold value, and when the temperature difference is larger than the threshold value. , Corresponds to an example of a control means for causing the airflow generating means to generate a second airflow different from the first airflow.

The notification unit 170 outputs information to the user according to the instruction of the control unit 140. The information output by the notification unit 170 may be the reproduction of an audio signal, the generation of a buzzer sound, the lighting of an LED (Light Emitting Diode), or the display of an image. There may be. FIG. 2 shows that the notification unit 170, which is a speaker, is built in the indoor unit 120.

The terminal 20 is a remote control terminal for the user to operate the air conditioning system 1000. The terminal 20 may be a smart phone or a wearable terminal. The terminal 20 receives the setting of the target temperature input from the user, and transmits the target temperature information indicating the target temperature to the indoor unit 120 by infrared communication.

In the air conditioning system 1000 having the above configuration, the refrigerant circuit includes a compressor 111 connected by a refrigerant pipe 101, an indoor heat exchanger 131, an expansion valve 114, and an outdoor heat exchanger 112. The refrigerant circuit when the heating operation is executed circulates the refrigerant through the compressor 111, the indoor heat exchanger 131, the expansion valve 114, and the outdoor heat exchanger 112 in this order.

Subsequently, the heating process executed in the air conditioning system 1000 will be described with reference to FIG. The heating process shown in FIG. 4 is started when a user inputs an instruction to start the heating process.

In the heating process, the temperature sensor 162 measures the suction temperature (step S1). Then, the room temperature information indicating the suction temperature is notified from the temperature sensor 162 to the control unit 140 via the acquisition unit 150.

Next, the infrared sensors 161 and 163 measure the surface temperatures of the ceiling and floor, respectively (step S2). Then, the surface temperature information indicating the measured value of the surface temperature is notified from the infrared sensors 161 and 163 to the control unit 140 via the acquisition unit 150.

Next, the control unit 140 calculates the surface temperature difference by subtracting the floor surface temperature from the ceiling surface temperature measured in step S2 (step S3). When the control unit 140 calculates the surface temperature difference, the control unit 140 temporarily writes the calculation result to the RAM or EEPROM which is a storage device.

Next, the control unit 140 determines whether or not the suction temperature measured in step S1 is equal to or higher than the target temperature set by the user (step S4). From this, it is determined whether or not heating is necessary.

When it is determined that the suction temperature is not equal to or higher than the target temperature (step S4; No), the control unit 140 sets the operating state of the air conditioning system 1000 to the normal mode (step S5). In the normal mode of step S5, the control unit 140 controls the components of the air conditioning system 1000 in order to make the room temperature equal to the target temperature, and temperature control control for supplying the heated air conditioning air to the indoor space 1001 is executed. NS. After that, the control unit 140 waits for a certain period of time (step S6). During standby, the immediately preceding operating state is maintained and control by the control unit 140 continues. The fixed time is, for example, 10 seconds, 1 minute or 10 minutes.

On the other hand, when it is determined that the suction temperature is equal to or higher than the target temperature (step S4; Yes), the control unit 140 sets the operating state to the normal mode (step S7). However, in the normal mode of step S7, the temperature control is not executed. After that, the process by the air conditioning system 1000 shifts to step S6.

Following step S6, the temperature sensor 162 measures the suction temperature (step S8), and the measured value of the suction temperature is notified to the control unit 140. Next, the control unit 140 determines whether or not the previously set operating state is the normal mode (step S9). Specifically, the control unit 140 determines whether or not the current operating state is different from the operating state for reducing the upper and lower temperature difference in the indoor space 1001.

When it is determined that the previously set operating state is the normal mode (step S9: Yes), the infrared sensors 161 and 163 measure the surface temperatures of the ceiling and the floor, respectively (step S10), and the measured values of these surface temperatures. Is notified to the control unit 140.

Next, the control unit 140 calculates the surface temperature difference from the surface temperature measured in step S10, and calculates the rate of change of the surface temperature difference, which is the amount of change from the previously calculated surface temperature difference (step S11). ). Specifically, the control unit 140 sets the surface temperature difference calculated this time as ΔT (n + 1), the previously calculated surface temperature difference as ΔT (n), the measurement time of the surface temperature this time as t (n + 1), and the previous time. The change in surface temperature difference per unit time according to the formula (ΔT (n + 1) -ΔT (n)) / (t (n + 1) -t (n)), where t (n) is the measurement time of the surface temperature of Calculate the rate.

Next, the control unit 140 determines whether or not the rate of change calculated in step S11 is equal to or greater than a predetermined threshold value Th1 (step S12). Thereby, it is determined whether or not the temperature difference between the upper and lower parts in the indoor space 1001 is rapidly increasing. When it is determined that the rate of change is equal to or greater than the threshold value Th1 (step S12; Yes), the control unit 140 sets the operating state to the temperature difference reduction mode 1 (step S13). The details of this temperature difference reduction mode 1 will be described later.

On the other hand, when it is determined that the rate of change is not equal to or higher than the threshold value Th1 (step S12; No), the control unit 140 determines whether or not the rate of change calculated in step S11 is equal to or higher than the predetermined threshold value Th2 (step S12; No). Step S14). Here, the threshold Th2 is smaller than the threshold Th1. As a result, it is determined whether or not the temperature difference continues to rise although the expansion of the temperature difference is suppressed to some extent by the execution of the temperature difference reduction mode 1 in step S13. When it is determined that the rate of change is equal to or higher than the threshold value Th2 (step S14; Yes), the control unit 140 sets the operating state to the temperature difference reduction mode 2 (step S15). The temperature difference reduction mode 2 is a mode in which an air flow having a smaller vertical component is generated as compared with the temperature difference reduction mode 1 and the air in the indoor space 1001 is gently agitated. However, the temperature difference reduction mode 2 may be a mode in which an air flow having a larger vertical component than the temperature difference reduction mode 1 is generated to efficiently agitate the air in the indoor space 1001. The details of the temperature difference reduction mode 2 will be described later.

On the other hand, when it is determined that the rate of change is not equal to or higher than the threshold Th2 (step S14; No), the control unit 140 determines whether or not the surface temperature difference calculated in step S11 is equal to or higher than the predetermined threshold Th3. (Step S16). As a result, it is determined whether or not there is a temperature difference to be reduced although the change over time of the temperature difference is small. When it is determined that the surface temperature difference is the threshold value Th3 or more (step S16; Yes), the control unit 140 sets the operating state to the temperature difference reduction mode 3 (step S17). The temperature difference reduction mode 3 is a mode in which an air flow having a smaller vertical component is generated as compared with the temperature difference reduction mode 2 and the air in the indoor space 1001 is agitated more gently. However, the temperature difference reduction mode 3 may be a mode in which an air flow having a larger vertical component than the temperature difference reduction mode 2 is generated to efficiently agitate the air in the indoor space 1001. The details of the temperature difference reduction mode 3 will be described later.

When changing the operating state from the normal mode to the temperature difference reduction mode in steps S13, S15, and S17, the control unit 140 controls the notification unit 170 to change the operating state in order to reduce the temperature difference. May be notified to the user. As a result, the user can recognize the operating state of the air conditioning system 1000. Here, when the user does not want to change the operating state and performs an operation to maintain the heating operation, the control unit 140 gives priority to the operation specified by the user without executing the temperature difference reduction mode. May be good.

When it is determined in step S16 that the surface temperature difference is not equal to or higher than the threshold value Th3 (step S16; No), the control unit 140 sets the operating state to the normal mode (step S18). In this step S18, the presence or absence of temperature control may be determined by the same procedure as in steps S4, S5, and S7, based on the suction temperature measured in step S8.

Following steps S13, S15, S17, and S18, the air conditioning system 1000 repeats the processes after step S8. As a result, one of the normal mode and the temperature difference reduction modes 1 to 3 is periodically selected and executed based on the surface temperature difference and the rate of change.

When it is determined in step S9 that the previous operating state is not the normal mode (step S9; No), the control unit 140 determines whether or not the suction temperature measured in step S8 is less than the previous measured value. (Step S19). Specifically, the control unit 140 determines whether or not the room temperature is lowered and the user's comfort is impaired during the execution of the temperature difference reduction mode. When it is determined that the suction temperature is not less than the previous measured value (step S19; No), the process by the air conditioning system 1000 shifts to step S10.

On the other hand, when it is determined that the suction temperature is lower than the previous measured value (step S19; Yes), the control unit 140 sets the operating state to the temperature control priority mode (step S20). The temperature control priority mode is a mode for ensuring the comfort of the user by giving priority to reaching the target temperature at room temperature. In the temperature control priority mode, instead of the air flow for reducing the temperature difference, an air flow similar to that in the normal mode may be temporarily generated, or an air flow for reducing the temperature difference to some extent may be generated. After that, the air conditioning system 1000 repeats the processes after step S8.

Subsequently, the temperature difference reduction modes 1 to 3 and the temperature control priority mode will be described with reference to FIGS. 5 to 8. FIG. 5 shows the execution conditions for each operation mode and the control target in association with each other. The implementation conditions correspond to the success or failure of the conditions determined in steps S13, S15, S17, and S19 shown in FIG.

When the operating state is set to the temperature difference reduction mode 1, the control unit 140 reduces the frequency of the compressor 111 by f1 from the value of the normal mode to suppress the heating capacity, and the air flow generated by the indoor unit 120. Lower the temperature of. The temperature difference caused by the execution of the heating operation is expanded or maintained when the heating capacity is maintained, and the control unit 140 suppresses the heating capacity to reduce the temperature difference. Further, the control unit 140 sets the lower limit of the tube temperature of the indoor heat exchanger 131 to a temperature lower than the lower limit in the normal mode. Specifically, a lower limit value is predetermined for the temperature of the pipe through which the refrigerant of the indoor heat exchanger 131 passes, and the control unit 140 usually has a range of the pipe temperature exceeding the lower limit value of the air conditioning system 1000. Controls the components. On the other hand, in the temperature difference reduction mode, the heating capacity can be suppressed by setting this lower limit value to a lower temperature. Further, the control unit 140 increases the rotation speed of the indoor fan constituting the indoor blower 132 by F1 from the value of the normal mode, and changes the wind direction by one step from the direction of the normal mode to the downward direction. As a result, a stronger air flow is generated in the downward direction than before the temperature difference reduction mode 1 is executed, and the air in the indoor space 1001 is agitated. If the wind direction is already vertically downward, it is not necessary to change the wind direction. f1 and F1 are predetermined values.

FIG. 6 shows an example in which the implementation conditions of the temperature difference reduction mode 1 are satisfied with respect to the surface temperature. In the example of FIG. 6, the surface temperature difference has increased from 1.5 ° C. to 2.0 ° C. and further increased to 2.5 ° C., and the rate of change per unit time is 2.0 ° C./h. .. Since this rate of change is larger than 1.5 ° C./h, which is an example of the threshold value Th1, the temperature difference reduction mode 1 is executed.

When the operating state is set to the temperature difference reduction mode 2, the control unit 140 reduces the frequency of the compressor 111 by f2 from the value in the normal mode, and increases the rotation speed of the indoor fan by F2 from the value in the normal mode. Then, the wind direction is changed by one step from the direction of the normal mode to the downward direction. As a result, as in the temperature difference reduction mode 1, it is expected that the air in the indoor space 1001 will be agitated by generating an air flow having a large vertical component, and the temperature difference will be reduced. However, since the temperature difference reduction mode 2 is executed when the temperature difference is slowly larger than that when the temperature difference reduction mode 1 is executed, the amount of change in the control target is smaller than the temperature difference reduction mode 1. .. Specifically, f2 is smaller than f1 and F2 is smaller than F1. f2 and F2 are predetermined values.

FIG. 7 shows an example in which the implementation conditions of the temperature difference reduction mode 2 are satisfied with respect to the surface temperature. In the example of FIG. 7, the surface temperature difference has increased from 1.5 ° C. to 1.7 ° C., further increased to 2.0 ° C., and the rate of change per unit time is 1.0 ° C./h. .. Since this rate of change is smaller than 1.5 ° C./h, which is an example of the threshold value Th1, and larger than 0.5 ° C./h, which is an example of the threshold value Th2, the temperature difference reduction mode 2 is executed.

Note that the wind direction may be changed more than one step when the temperature difference reduction modes 1 and 2 are set. This creates an airflow with a larger component in the vertical direction. However, if the wind direction is significantly changed from the one set by the user, the comfort of the user may be impaired. Therefore, the change in the wind direction may be limited to one step.

When the operating state is set to the temperature difference reduction mode 3, the control unit 140 reduces the frequency of the compressor 111 by f3 from the value in the normal mode, and increases the rotation speed of the indoor fan by F3 from the value in the normal mode. Then, the wind direction is changed by one step from the direction of the normal mode to the downward direction. As a result, as in the temperature difference reduction modes 1 and 2, it is expected that the temperature difference will be reduced by generating an air flow having a large vertical component. However, the temperature difference reduction mode 3 is implemented when the rate of change of the temperature difference is small but the temperature difference itself is large. In this case, since it is assumed that the environment in the indoor space 1001 is stable in a state where the temperature difference occurs, the amount of change of the control target is made smaller than that in the temperature difference reduction mode 2. Specifically, f3 is smaller than f2 and F3 is smaller than F2. f3 and F3 are predetermined values.

When the operating state is set to the temperature control priority mode, the control unit 140 increases the frequency of the compressor 111 by f4 from the value of the normal mode to increase the heating capacity. As a result, an air flow having a higher temperature than before the execution of the temperature control priority mode is generated, and it is possible to avoid a decrease in room temperature. f4 is a predetermined value.

FIG. 8 shows an example in which the execution conditions of each mode are satisfied in relation to the surface temperature difference and the elapsed time. The line L1 in FIG. 8 corresponds to the change in the surface temperature difference shown in FIG. 6, and the line L2 corresponds to the change in the surface temperature difference shown in FIG. 7. Further, the line L11 in FIG. 8 indicates when the rate of change is equal to the threshold value Th1, and the line L12 indicates when the rate of change is equal to the threshold value Th2. In FIG. 8, when the surface temperature difference changes in the hatched region A1 above the line L11, the temperature difference reduction mode 1 is executed and in the region A2 sandwiched between the line L11 and the line L12. When the surface temperature difference changes, the temperature difference reduction mode 2 is executed, and when the surface temperature difference changes in the hatched region A3 below the line L12, the temperature difference reduction mode 3 or The normal mode will be implemented.

As described above, when the surface temperature difference is smaller than the threshold value Th3 as the first threshold value, the operation in the normal mode is executed, the airflow generation unit 130 generates the first airflow for heating, and the surface temperature difference. When is larger than the threshold value Th3, the operation of the temperature difference reduction mode 3 is executed, and the airflow generation unit 130 generates a second airflow for agitating the air. It can be said that the surface temperature of the ceiling is approximately equal to the temperature of the air near the ceiling, and the surface temperature of the floor is approximately equal to the temperature of the air near the floor. Therefore, even if it is difficult to measure the air temperature near the ceiling and floor in a space with a high ceiling height, the air in the indoor space is agitated by the second air flow when there is a temperature difference between the top and bottom in the space. Will be done. As a result, it is possible to reduce the temperature difference between the upper and lower parts generated in a space having a high ceiling height.

Further, the second airflow generated in the temperature difference reduction mode 3 is an airflow having a larger vertical component than the first airflow generated in the normal mode. Therefore, it is expected that the temperature difference between the upper and lower parts will be reduced more reliably.

Specifically, the airflow generation unit 130 blows out the generated airflow from the outlet 180 to the indoor space 1001, and the direction in which the second airflow generated in the temperature difference reduction mode 3 is blown out from the outlet 180 is the normal mode. The first airflow generated in the above direction is below the direction in which the first airflow is blown out from the outlet 180. That is, as shown in FIG. 5, in the temperature difference reduction mode, the wind direction was changed by one step downward. Thereby, the temperature difference can be reduced. The direction of the second airflow may be higher than the direction of the first airflow as long as the vertical component is larger than the first airflow.

Further, the airflow generation unit 130 has an indoor blower 132, and the air volume of the indoor blower 132 in the temperature difference reduction mode 3 is larger than the air volume of the indoor blower 132 in the normal mode. Thereby, the temperature difference can be reduced.

Further, the air conditioning system 1000 includes a refrigerant circuit including a compressor 111 for compressing the refrigerant and an indoor heat exchanger 131 for exchanging heat between the refrigerant and the air in the indoor space, and in the temperature difference reduction mode 3 The rotation speed of the compressor 111 when the second air flow is generated is smaller than the rotation speed of the compressor 111 when the first air flow is generated in the normal mode. Specifically, as shown in FIG. 5, the rotation speed of the compressor 111 was reduced in the temperature difference reduction mode. As a result, it is possible to suppress the heating capacity that causes a temperature difference and eliminate the temperature difference.

Further, when the rate of change of the surface temperature difference is larger than the threshold value Th2 as the second threshold value, the temperature difference reduction modes 1 and 2 are executed, and the airflow generation unit 130 has a third airflow different from the first airflow in the normal mode. Was generated. Specifically, the airflow generation unit 130 generates a third airflow when the rate of change is larger than the threshold Th2, and generates a second airflow when the rate of change is smaller than the threshold Th2 and the surface temperature difference is larger than the threshold Th3. However, the third airflow is an airflow having a larger component in the vertical direction than the second airflow. As a result, when the rate of change of the temperature difference is large before the temperature difference becomes large, it is possible to prevent the occurrence of the temperature difference by generating the third air flow.

Further, during the execution of the temperature difference reduction mode, when the suction temperature is different from the target temperature, the operation of the temperature control priority mode is executed, and the airflow generation unit 130 generates a fourth airflow having a temperature different from that of the second airflow. .. Specifically, when the suction temperature is lower than the target temperature, the airflow generation unit 130 generates a fourth airflow having a temperature higher than that of the second airflow. As a result, it is possible to prevent the user's sensible temperature from being lowered while the air in the indoor space 1001 is being agitated, and the comfort being impaired.

Further, the lower limit of the tube temperature of the indoor heat exchanger 131 set when the temperature difference reduction mode is executed is lower than the lower limit in the normal mode. As a result, the heating capacity for raising the temperature of the airflow passing through the heat exchanger can be suppressed, and the temperature difference can be reduced more reliably.

Embodiment 2.
Subsequently, the second embodiment will be described focusing on the differences from the first embodiment described above. For the same or equivalent configuration as that of the first embodiment, the same reference numerals are used. The present embodiment is different from the first embodiment in that the infrared sensor 161 is arranged outside the indoor unit 120.

In the air conditioner system 1000 according to the present embodiment, as shown in FIG. 9, the indoor unit 120, the terminal 20, the management device 300 of the HEMS (Home Energy Management System), and the indoor unit 120 in the indoor space 1001 are It has infrared sensors 161 installed at different positions.

The infrared sensor 161 transmits surface temperature information indicating a measured value of the surface temperature of the ceiling to the management device 300, and the management device 300 notifies the control unit 140 of this surface temperature information via the acquisition unit 150. As a result, the control unit 140 can perform the same operation as in the first embodiment.

Further, the terminal 20 sets the target temperature in the indoor unit 120 via the management device 300 without directly communicating with the indoor unit 120. Further, the indoor unit 120 is configured by omitting the notification unit 170. The control unit 140 notifies the terminal 20 of the content of the notification to the user via the management device 300.

As described above, since the external device of the indoor unit 120 has a function of notifying the user, it becomes easy for the user to receive the notification and the configuration of the indoor unit 120 can be simplified. .. Further, since the infrared sensor 161 for measuring the surface temperature of the ceiling is installed outside the indoor unit 120, the position of the infrared sensor 161 can be determined regardless of the installation position of the indoor unit 120. As a result, the measurement accuracy of the surface temperature can be improved and the configuration of the indoor unit 120 can be simplified. Although the example in which the infrared sensor 161 is arranged outside the indoor unit 120 has been described, the present invention is not limited to this. One or more of the infrared sensors 161, 163 and the temperature sensor 162 may be arranged outside the indoor unit 120.

Embodiment 3.
Subsequently, the third embodiment will be described focusing on the differences from the first embodiment described above. For the same or equivalent configuration as that of the first embodiment, the same reference numerals are used. The present embodiment is different from the first embodiment in that the airflow generation unit 130 simultaneously generates two airflows.

FIG. 10 shows the configuration of the indoor unit 120 according to the present embodiment. As shown in FIG. 10, the airflow generator 130 includes two indoor heat exchangers 131 and 131a, indoor blowers 132 and 132a that blow air to each of the two indoor heat exchangers 131 and 131a, and an indoor blower. It has an air direction adjusting unit 133, 133a for adjusting the direction of the air flow generated by each of the 132 and 132a, and an expansion valve 134 connected to the two indoor heat exchangers 131 and 131a via the refrigerant pipe 101.

The indoor heat exchanger 131 condenses the refrigerant flowing in from the compressor 111 and sends it to the expansion valve 134. The expansion valve 134 is a decompressor similar to the expansion valve 114. The expansion valve 134 expands the refrigerant flowing in from the indoor heat exchanger 131 and discharges it to the indoor heat exchanger 131a. The opening degree of the expansion valve 134 changes according to the control instruction transmitted from the control unit 140. The indoor heat exchanger 131a condenses the refrigerant flowing in from the expansion valve 134 and sends it to the expansion valve 114 of the outdoor unit 110. The control unit 140 controls the refrigerant temperature of the indoor heat exchanger 131 and the refrigerant temperature of the indoor heat exchanger 131a by controlling the opening degrees of the expansion valves 114 and 134, and makes the temperatures of the two airflows independent. decide. The indoor blower 132a generates an air flow that passes through the indoor heat exchanger 131a. The wind direction adjusting unit 133a adjusts the direction of the airflow passing through the indoor heat exchanger 131a. The wind direction adjusting units 133 and 133a correspond to an example of two adjusting means for adjusting the direction of the airflow, and the indoor heat exchangers 131 and 131a are the first heat exchanger and the second heat exchanger constituting the airflow generating means. Corresponds to one example.

FIG. 11 shows an overview of the indoor unit 120 according to the present embodiment. As shown in FIG. 11, the wind direction adjusting unit 133 has flaps 1331, 1332 as wind direction adjusting plates, and the wind direction adjusting unit 133a has flaps 1331a and 1332a as wind direction adjusting plates. The angles of these wind direction adjusting plates are independently controlled by the control unit 140, and airflows that are blown out in different directions on the right side and the left side of the outlet 180 are generated.

Returning to FIG. 10, the indoor unit 120 further has a storage unit 190. The storage unit 190 is a non-volatile storage device, and stores the history of the end instruction of the air conditioning operation input by the user. Specifically, when the user inputs an end instruction, the control unit 140 adds a history indicating the input time to the storage unit 190, and then ends the operation. The indoor unit 120 may store the history in a server on the external network instead of the storage unit 190 and refer to it as appropriate. The storage unit 190 corresponds to an example of a storage means for storing stop time information indicating a time when the air conditioning operation is stopped.

Next, the operation of the stirring mode executed by the air conditioning system 1000 will be described. This stirring mode is executed when the temperature difference between the ceiling and the floor is detected at a certain time before the time corresponding to the time when the air conditioning operation is finished in the past. For example, if the air conditioning operation ends at 21:00 in the past, it is executed at the timing of 20:50, which is 10 minutes before this 21:00. Then, the indoor unit 120 generates an upward airflow and a downward airflow as shown in FIG. Here, the airflow generation unit 130 makes the temperature of the upward airflow lower than the temperature of the downward airflow. The upward airflow and the downward airflow correspond to an example of the upward airflow and the downward airflow generated as the second airflow by the airflow generating means. FIG. 12 shows a state in which warm air is accumulated in the upper part of the indoor space 1001 in which the first floor and the second floor are partially separated after a while has passed since the air conditioning system 1000 started the heating operation. .. When the stirring mode is executed, the airflow blown upward stirs the warm air, and the airflow blown downward stirs the air on the first floor. As a result, the temperature difference between the upper and lower parts of the indoor space 1001 is reduced.

Examples of the refrigeration cycle in the stirring mode are shown in FIGS. 13-16. FIG. 13 shows a case where the opening degree of the expansion valve 134 is large in the heating operation, and FIG. 14 shows a case where the opening degree of the expansion valve 134 is small in the heating operation. As can be seen from FIGS. 13 and 14, the temperatures of the two indoor heat exchangers 131 and 131a are different, and the temperatures of the two airflows are different. Similarly, FIG. 15 shows a case where the opening degree of the expansion valve is large in the cooling operation, and FIG. 16 shows a case where the opening degree of the expansion valve 134 is small in the cooling operation. It can be seen from FIGS. 15 and 16 that the temperatures of the two indoor heat exchangers 131 and 131a are different and the temperatures of the two airflows are different. In the cooling operation, the direction in which the refrigerant flows in the refrigerant circuit is opposite to that in the heating operation.

As described above, the stirring mode that reduces the temperature difference between the first floor and the second floor by blowing out the upward airflow and the downward airflow is before the time when the user ends the operation of the air conditioning system 1000. Will be implemented. Thereby, for example, when the user on the first floor goes up to the second floor to go to bed, the temperature difference between the first floor and the second floor can be eliminated in advance.

Here, by making the temperature of the upward airflow lower than the temperature of the downward airflow, the temperature difference can be reduced more efficiently. The airflow in the upward direction and the airflow in the downward direction may be different in air flow in addition to the wind direction and temperature. For example, the air volume of the upward airflow may be made larger than the airflow of the downward airflow to more reliably agitate the air on the second floor including the ceiling.

Although the embodiments have been described above, the present disclosure is not limited to the above embodiments.

For example, the infrared sensors 161 and 163 may be used to detect a user in the indoor space 1001, and the temperature difference reduction mode may be operated only when the user is absent. Further, in the first embodiment, the value of the control target shown in FIG. 5 is defined by the amount of change from the reference value in the normal mode, but the present invention is not limited to this. Specifically, the value of the control target shown in FIG. 5 may be defined by the amount of change with respect to the current value. For example, when the execution of the temperature difference reduction mode 1 is determined again after the operating state changes from the normal mode to the temperature difference reduction mode 1, the control unit 140 sets the frequency of the compressor from the normal mode (2 × f1). ) May be reduced. As a result, when the situation regarding the temperature difference does not change, the air flow that agitates the air in the indoor space 1001 is gradually strengthened, and the temperature difference can be more reliably eliminated. Further, in the example of FIG. 5, the value of the control target is reduced in the order of the temperature difference reduction modes 1, 2, and 3, but the value is not limited to this, and the value of the control target may be arbitrarily changed. For example, F1 may be smaller than F2 and F2 may be smaller than F3.

Further, the management device 300 according to the second embodiment may be configured as an air conditioning control device that realizes the functions of the acquisition unit 150 and the control unit 140 and controls the indoor unit 120 having the airflow generation unit 130. Further, the ceiling and the floor are not limited to horizontal surfaces, and may be inclined surfaces or may have irregularities. The ceiling may be a surface that receives heat from the accumulated warm air and radiates infrared rays, and the floor may be a surface that gives heat to the retained cold air and radiates infrared rays.

Further, the temperature difference reduction modes 1 and 2 may be integrated into one operating state, the execution of the temperature difference reduction modes 1 and 2 may be omitted, or the execution of the temperature control priority mode may be omitted. good. At least, if the operation of the temperature difference reduction mode 3 is executed when the surface temperature difference exceeds the threshold value, the upper and lower temperature difference in the indoor space 1001 can be eliminated. Further, in the first embodiment, an example in which the operation in the temperature difference reduction mode when the rate of change is large is carried out prophylactically before the temperature difference occurs is described, but the present invention is not limited to this. For example, when a temperature difference occurs, air may be agitated to some extent when the rate of change is large, and an air flow having a larger vertical component may be generated after the rate of change becomes small and the temperature difference shifts to a stable state. Specifically, when the temperature difference is larger than the threshold value Th3, the airflow generation unit 130 generates a second airflow having a relatively large vertical component in the temperature difference reduction mode 3 when the rate of change is smaller than the new threshold value Th4. When the rate of change is larger than the threshold value Th4, a fourth airflow having a relatively small vertical component may be generated. As yet another example, the air conditioning system 1000 may shift to a new operation mode to generate an air flow having a larger vertical component when the rate of change is still large in the case of a temperature difference. Specifically, when the temperature difference is larger than the threshold value Th3, the airflow generation unit 130 generates the second airflow in the temperature difference reduction mode 3 when the rate of change is smaller than the new threshold value Th4, and the rate of change is greater than the threshold value Th4. When it is large, a third airflow having a large vertical component may be generated.

Further, the function of the air conditioning system 1000 can be realized by dedicated hardware or by a normal computer system.

For example, a device that executes the above-described processing is configured by storing and distributing the program P1 executed by the control unit 140 in a non-temporary recording medium that can be read by a computer and installing the program P1 in the computer. can do. As such a recording medium, for example, a flexible disc, a CD-ROM (Compact Disc Read-Only Memory), a DVD (Digital Versatile Disc), and an MO (Magneto-Optical Disc) can be considered.

Alternatively, the program P1 may be stored in a disk device of a server device on a communication network represented by the Internet, superimposed on a carrier wave, and downloaded to a computer, for example.

The above process can also be achieved by starting and executing the program P1 while transferring it via the communication network.

Further, the above-mentioned processing can also be achieved by executing all or a part of the program P1 on the server device and executing the program while the computer sends and receives information on the processing via the communication network.

When the above-mentioned functions are shared by the OS (Operating System) or realized by collaboration between the OS and the application, only the parts other than the OS may be stored in the medium and distributed. , You may also download it to your computer.

Further, the means for realizing the functions of the air conditioning system 1000 is not limited to software, and a part or all of them may be realized by dedicated hardware including a circuit.

The present disclosure allows for various embodiments and modifications without departing from the broad spirit and scope of the present disclosure. Moreover, the above-described embodiment is for explaining this disclosure, and does not limit the scope of the present disclosure. That is, the scope of the present disclosure is indicated not by the embodiment but by the claims. And various modifications made within the scope of the claims and within the equivalent meaning of disclosure are considered to be within the scope of this disclosure.

This disclosure is suitable for air conditioning in a space with a high ceiling height.

1000 air conditioning system, 101 refrigerant piping, 110 outdoor unit, 111 compressor, 112 outdoor heat exchanger, 113 outdoor blower, 114 expansion valve, 120 indoor unit, 130 airflow generator, 131, 131a indoor heat exchanger, 132, 132a Indoor blower, 133, 133a Wind direction adjustment unit, 134 expansion valve, 140 control unit, 150 acquisition unit, 151 infrared transmitter / receiver, 161,163 infrared sensor, 162 temperature sensor, 170 notification unit, 180 outlet, 181 suction port, 190 Storage unit, 300 management device, 20 terminals, 1331-1334, 1331a, 1332a flap, A1 to A3 area, L1, L2, L11, L12 line, P1 program.

Claims (15)

1. Ceiling temperature measuring means for measuring the surface temperature of the ceiling in the indoor space to be air-conditioned,
   A floor temperature measuring means for measuring the surface temperature of the floor in the indoor space,
   When the temperature difference between the surface temperature of the ceiling measured by the ceiling temperature measuring means and the surface temperature of the floor measured by the floor temperature measuring means is smaller than the first threshold value, a first air flow is generated to generate the temperature. An airflow generating means that generates a second airflow different from the first airflow when the difference is larger than the first threshold value.
   Air conditioning system with.
2. The second airflow is an airflow having a larger vertical component than the first airflow.
   The air conditioning system according to claim 1.
3. The airflow generating means blows the generated first airflow and the second airflow from the air outlet into the indoor space.
   The direction in which the second airflow is blown out from the outlet is a direction above or below the direction in which the first airflow is blown out from the outlet.
   The air conditioning system according to claim 1 or 2.
4. The airflow generating means has a blowing means for generating the first airflow and the second airflow.
   The air volume of the blower means when the second airflow is generated is larger than the air volume of the blower means when the first airflow is generated.
   The air conditioning system according to any one of claims 1 to 3.
5. A refrigerant circuit having a compressor for compressing the refrigerant and a heat exchanger for exchanging heat between the refrigerant and the air in the indoor space is further provided.
   The first airflow and the second airflow are airflows that have passed through the heat exchanger and exchanged heat with the refrigerant.
   The rotation speed of the compressor when the second airflow is generated is smaller than the rotation speed of the compressor when the first airflow is generated.
   The air conditioning system according to any one of claims 1 to 4.
6. The first airflow and the second airflow are airflows whose temperature has risen by passing through a heat exchanger that exchanges heat between the refrigerant and the air in the indoor space.
   The lower limit of the tube temperature of the heat exchanger when the second air flow is generated is smaller than the lower limit of the tube temperature of the heat exchanger when the first air flow is generated.
   The air conditioning system according to any one of claims 1 to 4.
7. The airflow generating means generates a third airflow different from the first airflow when the rate of change of the temperature difference is larger than the second threshold value.
   The air conditioning system according to any one of claims 1 to 6.
8. The airflow generating means is
   When the rate of change is greater than the second threshold, the third airflow is generated.
   When the rate of change is smaller than the second threshold value and the temperature difference is larger than the first threshold value, the second air flow is generated.
   The third airflow is an airflow having a larger vertical component than the second airflow.
   The air conditioning system according to claim 7.
9. When the temperature difference is larger than the first threshold value, the airflow generating means generates the second airflow when the rate of change is smaller than the second threshold value, and when the rate of change is larger than the second threshold value. Generates the third airflow in
   The second airflow is an airflow having a larger vertical component than the third airflow.
   The air conditioning system according to claim 7.
10. An acquisition means for acquiring target temperature information indicating a target temperature of air in the indoor space, and
    A room temperature measuring means for measuring the temperature of air in the indoor space is further provided.
    The airflow generating means generates the second airflow when the temperature difference is larger than the first threshold value, and when the temperature of the air measured by the room temperature measuring means is different from the target temperature, the second airflow is generated. Generates a fourth airflow with a different temperature than
    The air conditioning system according to any one of claims 1 to 9.
11. Further equipped with a storage means for storing stop time information indicating the time when the air conditioning operation was stopped,
    The airflow generating means is
    It has two adjusting means to adjust the direction of the air flow,
    When the temperature difference is larger than the first threshold value before the time corresponding to the past time when the air conditioning operation is stopped indicated by the stop time information, the upward airflow blown upward by the two adjusting means. And the downward airflow that blows out downward are generated as the second airflow.
    The air conditioning system according to any one of claims 1 to 10.
12. The airflow generating means is
    It has a first heat exchanger and a second heat exchanger,
    The upward airflow whose temperature has changed by passing through the first heat exchanger and the downward airflow whose temperature has changed by passing through the second heat exchanger are generated.
    The temperature of the upward airflow is lower than the temperature of the downward airflow.
    The air conditioning system according to claim 11.
13. An air conditioning control device that controls an airflow generating means that generates an airflow in an indoor space that is an object of air conditioning.
    An acquisition means for acquiring the measured value of the surface temperature of the ceiling in the indoor space and the measured value of the surface temperature of the floor in the indoor space.
    When the temperature difference between the measured value of the surface temperature of the ceiling and the measured value of the surface temperature of the floor is smaller than the threshold value, the airflow generating means is made to generate the first airflow, and the temperature difference is larger than the threshold value. , A control means for causing the airflow generating means to generate a second airflow different from the first airflow,
    Air conditioning controller equipped with.
14. When the temperature difference between the surface temperature of the ceiling in the indoor space and the surface temperature of the floor in the indoor space is larger than the threshold value, a second air flow different from the first air flow when the temperature difference is smaller than the threshold value is generated. ,
    Air conditioning methods including.
15. To a computer that controls the airflow generation means that generates the airflow in the indoor space
    When the temperature difference between the surface temperature of the ceiling in the indoor space and the surface temperature of the floor in the indoor space is larger than the threshold value, the airflow is a second airflow different from the first airflow when the temperature difference is smaller than the threshold value. Let the generation means generate,
    A program to execute.

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