JP2024165966A - Control device and air conditioning device - Google Patents

Abstract

[Problem] An air conditioner is controlled so as to suppress discomfort felt by users inside a room during heating operation. [Solution] A control device controls an air conditioner (10) that has a refrigerant circuit and conditions an indoor space (S) by executing a refrigeration cycle, and when the air temperature of the indoor space (S) is set to room temperature, it determines whether a first condition is satisfied that the room temperature is equal to or lower than a predetermined temperature, and if the first condition is satisfied, executes a first heating operation in which air is blown toward the floor surface at a blown air temperature, or at a blown air temperature and wind speed, that suppresses the upward movement of the air blown downward from the air conditioner (10). [Selected Figure] Figure 6

Description

This disclosure relates to a control device and an air conditioning device.

The air conditioning device disclosed in Patent Document 1 is equipped with a floor temperature sensor and has a heating mode that eliminates warm air pools near the ceiling and cold feet based on the floor temperature.

JP 2012-225586 A

However, when the indoor air temperature is relatively low and warm air is blown down from the air conditioning unit toward the floor, the buoyancy of the warm air can cause the warm air to rise toward the ceiling before reaching the floor. In this case, it takes time for the air relatively close to the floor to warm up sufficiently, causing discomfort to the occupants in the room.

The objective of this disclosure is to control an air conditioner so as to reduce discomfort felt by users indoors during heating operation.

The first aspect is
A control device for controlling an air conditioner (10) that has a refrigerant circuit and conditions an indoor space (S) by executing a refrigeration cycle,
determining whether or not a first condition is satisfied, that is, the room temperature is equal to or lower than a predetermined value, when the air temperature of the indoor space (S) is set to room temperature;
When the first condition is satisfied, a first heating operation is performed in which air is blown toward the floor surface at a blown air temperature, or at a blown air temperature and wind speed, that prevents the air blown downward from the air conditioner (10) from rising.

In the first aspect, by executing the first heating operation when the room temperature falls below a predetermined temperature, the air blown downward into the indoor space (S) from the air conditioner (10) is more likely to reach the floor surface. This makes it possible to deliver warm air to the floor surface of the indoor space (S) relatively quickly. For example, when the air temperature in the indoor space (S) is relatively low, the time from the start of the heating operation until the occupants feel the warm air can be shortened, thereby reducing the discomfort felt by the occupants.

The second aspect is the first aspect,
In the first heating operation, air having a temperature lower than a control range of the blown air temperature, which is determined based on the room temperature and a set temperature, is blown out from the air conditioner (10).

In the second aspect, when the heating operation in which the air conditioner (10) operates at a blowing temperature determined based on the room temperature and the set temperature is regarded as the normal heating operation, the temperature of the blown air in the first heating operation is lower than the control range of the blown air temperature in the normal heating operation, so that the buoyancy acting on the blown air can be reduced. This makes it possible to suppress the rise of the blown air, and to deliver warm air to the floor surface more quickly than in the case of performing the normal heating operation.

The third aspect is the first or second aspect,
When the room temperature when the first condition is satisfied is a first room temperature,
The first heating operation is executed based on predetermined data indicating a change in the first room temperature acquired based on the first room temperature and the temperature of the air blown out at the first room temperature.

In the third aspect, for example, the indoor space (S) can be heated more quickly by selecting the blown air temperature that results in the greatest temperature rise from the first room temperature based on predetermined data. Also, by selecting a relatively low blown air temperature from among the blown air temperatures that result in a temperature rise from the first room temperature based on predetermined data, warm air can be delivered to the floor surface more quickly and power consumption can be reduced.

In a fourth aspect, the third aspect is
The predetermined data is further acquired based on the wind speed of the blown air or the position in the indoor space (S) from which the blown air is blown out.

In the fourth aspect, since the number of parameters is increased compared to the first data in the third aspect, the degree of temperature rise from the first room temperature can be grasped with high accuracy.

A fifth aspect is the third or fourth aspect of the present invention,
The predetermined data is generated such that the lower the first room temperature, the lower the temperature of the blown air becomes.

In the fifth aspect, the difference between the first room temperature and the temperature of the air blown out from the air conditioner (10) can be reduced. This reduces the buoyancy acting on the blown out air.

A sixth aspect is any one of the first to fifth aspects,
The air conditioner (10) includes an indoor unit (40) having an air outlet (47) for blowing air into the indoor space (S),
The indoor unit (40) has an airflow direction adjustment part (57) that is provided at the air outlet (47) and adjusts the airflow direction,
In the first heating operation, the airflow direction adjustment part (57) is controlled in accordance with the temperature distribution in the room space (S).

In the sixth aspect, for example, the air direction adjustment unit (57) can be controlled so that air from the air outlet (47) reaches a location in the indoor space (S) where the air temperature is lower than the surrounding area, thereby suppressing unevenness in the air temperature in the indoor space (S) and quickly bringing the room temperature to the set temperature.

A seventh aspect is any one of the first to sixth aspects,
The first heating operation is performed with the air temperature at a position 1.6 m or less above the floor surface of the indoor space (S) set as the room temperature.

In the seventh aspect, the air temperature 1.6 m or less above the floor is the temperature at the height where occupants are present in the indoor space (S). By setting this temperature as the room temperature and executing the first heating operation, warm air can be delivered quickly to the occupants.

The eighth aspect is any one of the first to seventh aspects,
The air conditioning system further includes a first control mode in which, when a second condition is determined that the total heat quantity of the air in the indoor space (S) during a first period is lower than the total heat quantity of the air processed by the air conditioning device (10) during the first period, the temperature of the blown air is reduced.

In the eighth aspect, when the second condition is satisfied, it is presumed that air warmer than the surroundings is accumulating in the upper part of the indoor space (S). In this case, by lowering the temperature of the air blown out from the air conditioning device (10), the warm air accumulating in the upper part of the indoor space (S) can be sent to the lower part.

A ninth aspect is any one of the first to seventh aspects,
The air conditioning system further includes a first control mode in which, when a second condition is determined that the total heat quantity of the air in the indoor space (S) during a first period is lower than the total heat quantity of the air processed by the air conditioning device (10) during the first period, the wind speed of the blown air is increased.

In the ninth aspect, the wind speed of the air blown out from the air conditioning device (10) into the indoor space (S) is increased, so that the warm air that has accumulated at the upper part of the indoor space (S) can be delivered to the lower part.

A tenth aspect is any one of the first to ninth aspects,
When the room temperature is lower than a set temperature after the first heating operation is performed, the first heating operation is continued or further performed.

In the tenth aspect, if the room temperature does not reach the set temperature even after the first heating operation is performed, the room temperature can be quickly brought closer to the set temperature by continuing the first heating operation or by performing the first heating operation again.

An eleventh aspect is any one of the first to tenth aspects,
Controlling a ventilation device (70) that ventilates the indoor space (S);
The control system has a second control mode in which, when it is determined that a third condition is satisfied, that is, the carbon dioxide concentration in the indoor space (S) is equal to or lower than a predetermined value, the operation of the ventilation device (70) is stopped or the amount of air to be ventilated is reduced, during the first heating operation.

In the eleventh aspect, when the carbon dioxide concentration in the indoor space (S) is equal to or lower than a predetermined value, it is assumed that ventilation of the indoor space (S) is unnecessary or may be reduced, and therefore priority can be given to quickly heating the indoor space (S) to the set temperature.

A twelfth aspect is any one of the first to eleventh aspects,
The air conditioning device (10) includes a conveyor (52) that conveys air to the indoor space (S), and blows air from above toward below the indoor space (S).
The air conditioner (10) has a third control mode in which, during a second period in which the thermo-off operation is performed during heating operation, the air conditioner (10) performs a blowing operation in which the conveyer (52) is operated.

In the twelfth aspect, it is assumed that the air temperature in the indoor space (S) has reached close to the set temperature when the thermo-off is executed. In this case, since warm air tends to accumulate in the upper part of the indoor space (S), by executing the fourth control mode, the warm air can be delivered to the lower part of the indoor space (S).

A thirteenth aspect is any one of the first to twelfth aspects,
The air conditioning system (10) includes a conveyor (52) that conveys air to the indoor space (S),
The fourth control mode controls a plurality of the air conditioners (10) that condition the same indoor space (S), and while at least one of the air conditioners (10) is performing a heating operation, causes at least one of the other air conditioners (10) to perform a blowing operation by operating the conveyor (52).

In the thirteenth aspect, temperature unevenness in the indoor space (S) can be suppressed by having another air conditioning unit perform fan operation during heating operation.

The fourteenth aspect is an air conditioning device equipped with a control device according to any one of the first to thirteenth aspects.

FIG. 1 is a piping diagram of an air conditioning apparatus according to an embodiment. FIG. 2 is a vertical cross-sectional view showing the internal structure of the indoor unit according to the embodiment. FIG. 3 is a block diagram showing the relationship between the air conditioning control unit and various devices. FIG. 4 is a diagram showing control data according to the embodiment. FIG. 5 is a graph comparing the change over time in the air temperature in the indoor space (S) when the first heating operation is performed and when the normal mode is performed. FIG. 6 is a flowchart showing the operation of the first control unit when the first heating operation is performed. FIG. 7 is a flowchart showing the operation of the first control unit when the first control mode is executed. FIG. 8 is a diagram illustrating the first control mode performed by the first control unit according to the first modification. FIG. 9 is a diagram illustrating the operation of the first control unit according to the third modification. FIG. 10 is a flowchart showing the operation of the first control unit according to the third modification. FIG. 11 is a block diagram according to the fourth modification, which corresponds to FIG. FIG. 12 is a flowchart showing the operation of the first control unit according to the fourth modification. FIG. 13 is a diagram showing the relationship between a control device and an air conditioning device according to Modification 6. In FIG.

The following describes embodiments of the present invention with reference to the drawings. Note that the following embodiments are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or its uses. Furthermore, the configurations of the embodiments, variations, other examples, etc. described below can be combined or partially substituted within the scope of the present invention.

(1) Overall Configuration of the Air Conditioner As shown in Fig. 1 and Fig. 2, the air conditioner (10) includes a refrigerant circuit (11) and conditions an indoor space (S) by executing a refrigeration cycle. The air conditioner (10) includes an indoor fan (52) that transports air, and blows the air transported by the indoor fan (52) into the indoor space (S). Specifically, the air conditioner (10) includes an outdoor unit (20), an indoor unit (40), a liquid connection pipe (12), and a gas connection pipe (13). The outdoor unit (20) and the indoor unit (40) are connected to each other via the liquid connection pipe (12) and the gas connection pipe (13). The connection of these components forms a refrigerant circuit (11).

The refrigerant circuit (11) is filled with refrigerant. The refrigerant circuit (11) performs a vapor compression refrigeration cycle. The refrigerant circuit (11) mainly includes a compressor (21), an outdoor heat exchanger (22), an outdoor expansion valve (23), an indoor heat exchanger (53), and a four-way switching valve (25).

(2) Outdoor Unit The outdoor unit (20) is installed outdoors and includes a compressor (21), an outdoor heat exchanger (22), an outdoor fan (26), an outdoor expansion valve (23), and a four-way switching valve (25).

The compressor (21) compresses the sucked low-pressure gas refrigerant and discharges the compressed refrigerant. The compressor (21) is a variable capacity type in which power is supplied to the electric motor from an inverter circuit.

The outdoor heat exchanger (22) exchanges heat between the outdoor air transported by the outdoor fan (26) and the refrigerant. The outdoor fan (26) transports the outdoor air passing through the outdoor heat exchanger (22).

The outdoor expansion valve (23) reduces the pressure of the refrigerant. The outdoor expansion valve (23) is an electrically operated expansion valve whose opening is adjustable.

The four-way switching valve (25) has four ports (P1 to P4). The first port (P1) is connected to the discharge part of the compressor (21). The second port (P2) is connected to the suction part of the compressor (21). The third port (P3) is connected to the gas end of the outdoor heat exchanger (22). The fourth port (P4) is connected to the gas connection pipe (13).

The four-way switching valve (25) switches between a first state (indicated by a solid line in FIG. 1) and a second state (indicated by a dashed line in FIG. 1). In the first state, a refrigeration cycle is executed in which the indoor heat exchanger (53) serves as an evaporator. In the second state, a refrigeration cycle is executed in which the indoor heat exchanger (53) serves as a radiator.

(2) Indoor Unit The indoor unit (40) is a ceiling-embedded type that is installed on the ceiling of the indoor space (S). The indoor unit (40) has a casing (41), an airflow direction adjustment section (57), a bell mouth (51), an indoor fan (52), an indoor heat exchanger (53), a drain pan (54), and an indoor expansion valve (55). The indoor unit (40) has an intake port (46) that draws in indoor air, and an outlet port (47) that blows air into the room. The intake port (46) and the outlet port (47) open downward.

(2-1) Casing The casing (41) is disposed in an opening (63a) formed in the ceiling of the room space (S). An air passage (48) that connects the suction opening (46) and the air outlet (47) is formed in the casing (41). The casing (41) has a casing body (42), a panel (43), and a suction grille (43b).

The casing body (42) is generally box-shaped. The casing body (42) has an opening that opens downward. The opening is formed over substantially the entire area of the lower surface of the casing body. The casing body (42) is placed in the space above the ceiling.

The panel (43) is provided to cover the opening of the casing body (42). The panel (43) has an inlet (46) and an outlet (47). The outlet (47) is arranged around the inlet (46). Specifically, the panel (43) has a frame-shaped frame portion (43a) and an inlet grill (43b) that fits inside the frame portion (43a). The inner frame of the frame portion (43a) is formed in a rectangular shape, and the outlet (47) is provided along the inner frame of the frame portion (43a). The inlet (46) is provided with an inlet grill (43b). The inlet grill (43b) communicates with the indoor space (S) and the inlet (46). The inlet grill (43b) is provided with a filter (50). The filter (50) collects dust particles in the intake air that is drawn in through the intake port (46).

(2-2) Airflow direction adjustment unit The airflow direction adjustment unit (57) adjusts the direction of air blown out from the air outlet (47). The airflow direction adjustment unit (57) has a flap (57a), a drive shaft (57b), and a motor (not shown). The flap (57a) is formed in a long and narrow plate shape. The flap (57a) is placed at the air outlet (47). The flap (57a) is provided so as to close the air outlet (47). The drive shaft (57b) rotates the flap (57a). As the drive shaft (57b) rotates, the position of the flap (57a) changes between a closed position that closes the air outlet (47) and an open position that opens the air outlet (47). The motor controls the rotation of the drive shaft (57b). Specifically, the motor controls the drive shaft (57b) so that the flap (57a) maintains a plurality of specific positions. In other words, the motor changes the orientation of the flap (57a) to a plurality of open positions, such as a first position in which the wind blows substantially straight down, a second position in which the wind blows obliquely downward, and a third position in which the wind blows substantially horizontally.

(2-3) Bellmouth The bellmouth (51) is disposed in the air passage (48). The bellmouth (51) is disposed above the filter (50). The bellmouth (51) straightens the flow of the intake air.

(2-4) Indoor Fan The indoor fan (52) is disposed above the bellmouth (51). The indoor fan (52) is a centrifugal type. The indoor fan (52) is disposed in the air passage (48) upstream of the indoor heat exchanger (53). The indoor fan (52) transports air passing through the indoor heat exchanger (53). The indoor fan (52) is an example of a transporter (52) that transports air. The rotation speed of the indoor fan (52) is variable. The indoor fan (52) is controlled to a plurality of rotation speed stages. By controlling the rotation speed of the indoor fan (52), the wind speed of the air blown out from the air outlet (47) (hereinafter, sometimes referred to as blown air) is adjusted. The wind speed of the blown air is synonymous with the volume of the blown air.

(2-5) Indoor Heat Exchanger The indoor heat exchanger (53) is disposed around the indoor fan (52). In the indoor heat exchanger (53), heat is exchanged between the air transported by the indoor fan (52) and the refrigerant.

(2-6) Drain Pan The drain pan (54) is disposed below the indoor heat exchanger (53). The drain pan (54) receives condensation water generated inside the casing (41) of the indoor unit (40). Water accumulated in the drain pan (54) is discharged to the outside via a drain pipe (not shown).

(2-7) Indoor Expansion Valve The indoor expansion valve (55) reduces the pressure of the refrigerant. The indoor expansion valve (55) is an electrically operated expansion valve whose opening is adjustable.

(2-7) Temperature Sensor As shown in FIG. 3, the air conditioner (10) has a room temperature sensor (81). The room temperature sensor (81) detects the air temperature in the indoor space (S). The room temperature sensor (81) is disposed at a height of 0.3 m from the floor of the indoor space (S). The room temperature sensor (81) may be disposed at a height of 0.3 m from the floor, and may be disposed on a wall surface of the indoor space (S), directly below the indoor unit (40), or on furniture such as a desk disposed in the indoor space (S). In the following description, the air temperature in the indoor space (S) may be simply referred to as room temperature.

(3) Remote Controller The air conditioner (10) has a remote controller (60). The remote controller (60) is a device for operating the air conditioner (10). The remote controller (60) has a first operation unit (61) and a first display unit (62).

The first operation unit (61) is a functional unit that enables a person to input various instructions to the air conditioning apparatus (10). The first operation unit (61) includes a switch, a button, or a touch panel. The first display unit (62) displays the settings for the air conditioning apparatus (10) and the status of the air conditioning apparatus (10).

(4) Air Conditioning Control Unit The air conditioner (10) has an air conditioning control unit (AC). The air conditioning control unit (AC) controls the operation of the air conditioner (10). The air conditioning control unit (AC) includes a first control unit (C1), a second control unit (C2), a third control unit (C3), a first communication line (W1), and a second communication line (W2). Each of the first control unit (C1), the second control unit (C2), and the third control unit (C3) includes an MCU (Micro Control Unit), an electric circuit, and an electronic circuit. The MCU includes a CPU (Central Processing Unit), a memory, and a communication interface. The memory stores various programs to be executed by the CPU.

The first control unit (C1) controls the compressor (21), the four-way switching valve (25), the outdoor expansion valve (23), and the outdoor fan (26). In this embodiment, the first control unit (C1) is an example of the control device (C).

The second control unit (C2) controls the indoor expansion valve (55) and the indoor fan (52). The third control unit (C3) outputs instructions based on the input of the first operating unit (61) to the second control unit (C2).

The third control unit (C3) causes the first display unit (62) to display predetermined information in response to an input from the first operation unit (61).

(5) Operation The operation of the air conditioner (10) will be described with reference to Fig. 1. The air conditioner (10) switches between cooling operation and heating operation. In Fig. 1, the flow of refrigerant during cooling operation is indicated by solid arrows, and the flow of refrigerant during heating operation is indicated by dashed arrows.

(5-1) Cooling Operation In cooling operation, the first control section (C1) operates the compressor (21) and the outdoor fan (26), sets the four-way switching valve (25) to the first position, and fully opens the outdoor expansion valve (23). The second control section (C2) operates the indoor fan (52) and adjusts the indoor expansion valve (55) to a predetermined opening degree.

During cooling operation, the refrigerant circuit (11) performs a first refrigeration cycle. In the first refrigeration cycle, the outdoor heat exchanger (22) functions as a radiator (strictly speaking, a condenser), and the indoor heat exchanger (53) functions as an evaporator.

Specifically, the refrigerant compressed by the compressor (21) flows through the outdoor heat exchanger (22). In the outdoor heat exchanger (22), the refrigerant releases heat to the outdoor air and condenses. The refrigerant condensed in the outdoor heat exchanger (22) flows into the indoor unit (40) through the liquid connection pipe (12). In the indoor unit (40), the refrigerant is decompressed by the indoor expansion valve (55) and then flows through the indoor heat exchanger (53). In the indoor heat exchanger (53), the refrigerant absorbs heat from the indoor air and evaporates. The refrigerant evaporated in each indoor heat exchanger (53) is sucked back into the compressor (21) through the gas connection pipe (13).

(5-2) Heating Operation In the heating operation, the first control section (C1) operates the compressor (21) and the outdoor fan (26), sets the four-way switching valve (25) to the second state, and adjusts the outdoor expansion valve (23) to a predetermined opening. The second control section (C2) operates the indoor fan (52) and adjusts the indoor expansion valve (55) to a predetermined opening.

During heating operation, the refrigerant circuit (11) performs a second refrigeration cycle. In the second refrigeration cycle, the indoor heat exchanger (53) functions as a radiator (strictly speaking, a condenser), and the outdoor heat exchanger (22) functions as an evaporator.

Specifically, the refrigerant compressed by the compressor (21) flows into the indoor unit (40) through the gas connection pipe (13). In the indoor unit (40), the refrigerant flows through the indoor heat exchanger (53). In the indoor heat exchanger (53), the refrigerant releases heat to the indoor air and condenses. The refrigerant condensed in each indoor heat exchanger (53) is depressurized by each indoor expansion valve (55) and then flows into the liquid connection pipe (12). The refrigerant in the liquid connection pipe (12) is depressurized by the outdoor expansion valve (23) and then flows into the outdoor heat exchanger (22). In the outdoor heat exchanger (22), the refrigerant absorbs heat from the outdoor air and evaporates. The refrigerant evaporated in the outdoor heat exchanger (22) is sucked into the compressor (21).

(6) Issues in heating operation In general, air conditioners in heating operation operate by increasing the heating capacity so that the room temperature quickly reaches the set temperature. For example, the air conditioner is controlled so that air is blown out from the indoor unit at the blowing temperature and air speed that maximize the heating capacity.

Here, the warm air blown out from the indoor unit is subject to buoyancy against the cold air in the indoor space. As a result, the blown air rises toward the ceiling before reaching the floor of the indoor space, and it has become clear that the warm air blown out from the indoor unit has difficulty reaching the area near the floor. As the temperature in the indoor space moves from the higher temperature areas upwards to the lower areas, the air temperature near the floor gradually rises, but it takes time for the room temperature to reach the set temperature. In this way, even if the heating operation is started when the resident (user) wakes up or returns from outside during periods when the outside temperature is relatively low, such as winter, it takes time for the air temperature near the floor of the indoor space to rise, causing discomfort to the user.

To address these issues, the air conditioning apparatus of the present disclosure performs a first heating operation. The first heating operation prevents the air blown out from the indoor unit (40) from rising, making it easier for the blown air to reach the floor surface of the indoor space (S). An example of the first heating operation is described below.

(7) First heating operation The first heating operation is executed by the first control section (C1). The first heating operation is an operation in which, when a first condition is established that the room temperature is equal to or lower than a predetermined temperature, air is blown out toward the floor surface at a temperature and velocity that suppresses the air blown out from the indoor unit (40) from rising.

The specified temperature is, for example, 20°C. The specified temperature may be a temperature between 10°C or more and less than 20°C, or between 5°C or more and less than 10°C.

The room temperature is the temperature detected by the room temperature sensor (81). In other words, the room temperature is the air temperature at a height of 0.3 m above the floor. The first control unit (C1) detects the room temperature when the heating operation starts.

Whether or not the first condition is satisfied is determined by the first control unit (C1). Specifically, the first control unit (C1) determines whether or not the first condition is satisfied based on the temperature information output from the room temperature sensor (81).

When the first condition is not met, i.e., when the room temperature is higher than the predetermined temperature, the first control unit (C1) executes normal heating operation. In normal heating operation, the air conditioner (10) blows out air from the indoor unit (40) at a temperature corresponding to the maximum value of the control range of the blown air temperature, which is determined based on the room temperature and the set temperature, so that the room temperature reaches the set temperature. On the other hand, when the first condition is met, the first control unit (C1) makes the temperature of the blown air blown out from the indoor unit (40) lower than the temperature corresponding to the maximum value of the control range of the blown air temperature during normal heating operation.

For example, the specified temperature is 15°C, and the room temperature is set to 27°C. In this case, the first condition is met when the room temperature is below 15°C. If the first heating operation is not performed and normal heating operation is performed, the air conditioner (10) blows out air from the indoor unit (40) at a temperature (e.g., 43°C) that corresponds to the maximum value of the control range of the blown air temperature determined based on the room temperature of 15°C and the set temperature of 27°C. However, if the first heating operation is performed, the air conditioner (10) blows out air at a temperature lower than 43°C (e.g., 40°C) from the indoor unit (40).

(8) Control Data The first control unit (C1) executes the first heating operation based on the control data. The control data is data indicating a change in the first room temperature, when the room temperature when the first condition is satisfied is defined as the first room temperature, and is acquired based on the first room temperature and the temperature of the air blown out at the first room temperature. The control data is an example of predetermined data. The control data is stored in a memory device of the first control unit (C1).

Figure 4 shows an example of visualized control data. The control data includes first data, second data, and third data. Each data shows the relationship between a plurality of room temperatures (10°C to 20°C) and a plurality of blown air temperatures (43°C to 28°C). Specifically, each data indicates the temperature condition of the blown air when the air temperature at a height of 0.3 m from the floor reaches a predetermined temperature (Δt) or more when the blown air is blown out when the first condition is satisfied, with "o", and indicates the temperature condition of the blown air that is less than Δt with "x". The first data is the control data when the wind speed is "strong", the second data is the control data when the wind speed is "medium", and the third data is the control data when the wind speed is "weak". For example, in the first data, when the room temperature when the first condition is satisfied is 14°C, the blown air temperature condition that is "o" and rises by Δt degrees from 14°C is 34°C, 31°C, 28°C, or 25°C. That is, when the room temperature is 14°C when the first condition is met, the first heating operation is performed with the blown air temperature condition of 34°C, 31°C, 28°C, or 25°C and the wind speed condition of "strong." This shows that the blown air reaches a height of 0.3 m above the floor surface.

In this way, in the first heating operation, the first control unit (C1) selects the blown air temperature and wind speed that indicate "O" at the room temperature when the first condition is met based on the control data, and operates the air conditioner (10) to blow air at the selected blown air temperature and wind speed. The blown air temperature that satisfies "O" is lower than the maximum value of the control range of the blown air temperature when normal operation is performed at the same room temperature. Note that, if there are multiple blown air temperatures and wind speeds that indicate "O", the blown air temperature and wind speed that consumes the least amount of power may be selected from them, or the blown air temperature and wind speed that increases the room temperature the fastest or that causes the room temperature to reach the set temperature may be selected.

The control data is generated so that the lower the first room temperature, the lower the temperature of the blown air. In this embodiment, the control data is generated so that the lower the first room temperature, the lower the maximum temperature of the blown air. Specifically, "low first room temperature" refers to, for example, the first room temperature being lower than the set temperature. In other words, "low first room temperature" refers to a larger difference between the set temperature and the first room temperature. This is because, as explained above, the larger the difference between the room temperature and the temperature of the blown air when the first condition is met, the more difficult it becomes for the blown air to reach the floor surface due to buoyancy. Therefore, by reducing the difference between the room temperature (first room temperature) when the first condition is met and the temperature of the blown air, the rise of the air blown downward into the indoor space (S) is suppressed, making it easier for the blown air to reach the floor surface.

As shown in Figure 5, when the first heating operation is performed (solid line), the room temperature reaches the set temperature more quickly than when the normal mode is performed (dashed line). The normal mode is a mode in which the air conditioner operates at the maximum value of the heating capacity control range.

Such control data may be created based on the results of a predetermined experiment or simulation. An example of an experiment is shown below. An indoor unit is installed on the ceiling of an indoor space of a predetermined size, and a temperature sensor is installed at a height of 0.3 m from the floor. This indoor space has a predetermined heat transfer coefficient. Three room temperatures are set when the first condition is met (for example, 10°C, 12°C, and 14°C). For each room temperature, four temperature conditions of the blown air are set (for example, 40°C, 36°C, 32°C, and 28°C), and three wind speed conditions of the blown air are set for each temperature condition of the blown air (strong, medium, and weak). In this case, heating operation was performed for each of the 36 conditions (3 room temperatures x 4 temperature conditions of the blown air x 3 wind speed conditions of the blown air). The wind direction at this time is generally directly downward. The control data is created by evaluating how much the room temperature obtained for each of these 36 conditions has risen from the room temperature when the first condition was met. The temperature of the air blown out may be measured by installing a temperature sensor at the air outlet of the indoor unit.

(9) Operation of the First Control Unit The operation of the first control unit (C1) when the first heating operation is performed will be described with reference to Fig. 6. When a command to stop operation is transmitted from the remote controller (60) in the middle of the flowchart shown in Fig. 6, the operation of the first control unit (C1) ends.

In step S11, the first control unit (C1) determines whether or not a command to start the heating operation has been received from the remote controller (60). If it is determined that a command to start the heating operation has been received (YES in step S11), step S12 is executed. If it is determined that a command to start the heating operation has not been received (NO in step S11), step S11 is executed again.

In step S12, the first control unit (C1) determines whether the first condition is satisfied. Specifically, the first control unit (C1) determines whether the temperature acquired from the room temperature sensor (81) at the start of the heating operation is equal to or lower than 20°C. If it is determined that the first condition is satisfied (YES in step S12), step S13 is executed. If it is determined that the first condition is not satisfied (NO in step S12), the first heating operation is not executed and normal heating operation is started.

In step S13, the first control unit (C1) determines whether there is one operating condition that satisfies the condition from the control data, based on the temperature obtained from the room temperature sensor (81). "Operating conditions that satisfy the condition" refers to the blown air temperature and wind speed that indicate "O" in the control data. If it is determined that there is one operating condition that satisfies the condition (YES in step S13), step S14 is executed. If it is determined that there is not one operating condition that satisfies the condition, that is, there are multiple operating conditions that satisfy the condition (NO in step S13), step S15 is executed.

In step S14, the first control unit (C1) selects the operating conditions.

In step S15, the first control unit (C1) selects the operating condition that causes the room temperature to rise most quickly from among the multiple operating conditions that satisfy the conditions. This allows the warm air blown out from the air outlet (47) to be quickly delivered to the user's feet.

In step S16, the first control unit (C1) executes the first heating operation based on the operating conditions selected in step S14 or step S15.

In step S17, the first control unit (C1) determines whether the room temperature has reached the set temperature. If it is determined that the room temperature has reached the set temperature (YES in step S17), step S18 is executed. If it is determined that the room temperature has not reached the set temperature (NO in step S17), the first heating operation is further executed (continued), and step S17 is executed again.

In step S18, the first control unit (C1) ends the execution of the first heating operation. After that, normal heating operation is performed.

(10) Features (10-1) Feature 1
The first control unit (C1) of this embodiment determines whether a first condition, that is, the room temperature is below a predetermined temperature, is satisfied, and, if the first condition is satisfied, executes a first heating operation in which air is blown toward the floor surface at a temperature and velocity of the blown air that is blown downward from the air conditioning unit (10) to prevent the air from rising.

According to this embodiment, by executing the first heating operation, warm air is delivered relatively quickly to the floor surface of the indoor space (S). As a result, when the room temperature is relatively low, for example, the time from the start of the heating operation until the warm air reaches the floor surface can be shortened, thereby suppressing the discomfort felt by the user due to the cold. In addition, since the air temperature near the floor surface can be heated with priority, the user can feel warmth at their feet.

(10-2) Feature 2
In the first heating operation of this embodiment, air is blown out from the air conditioner (10) at a temperature lower than the maximum value of the control range of the blown air temperature, which is determined based on the room temperature and the set temperature.

According to this embodiment, when the normal heating operation is, for example, an operation in which air is blown out at a blowing temperature corresponding to the maximum value of the control range of the blowing air temperature determined based on the room temperature and the set temperature, by executing the first heating operation, it is possible to deliver warm air to the user on the floor surface more quickly than in the normal heating operation. In addition, in the first heating operation, the blowing air is blown out at a lower temperature than when the normal heating operation is executed, so that the power consumption of the air conditioner (10) can be reduced, and energy savings can be realized.

(10-3) Feature 3
The control unit (C1) of this embodiment executes a first heating operation based on predetermined data (control data) indicating a change in the first room temperature obtained based on the first room temperature and the temperature of the air blown out at the first room temperature.

According to the embodiment, for example, the indoor space (S) can be heated more quickly by selecting the blown air temperature that results in the greatest temperature rise from the first room temperature based on the control data. Also, by selecting a relatively low blown air temperature from among the blown air temperatures that result in the greatest temperature rise from the first room temperature based on the control data, the heating capacity can be reduced and power consumption can be suppressed. In this way, by using the control data, the first heating operation can be easily performed to suit a variety of purposes.

(10-4) Feature 4
The control data in this embodiment is further acquired based on the wind speed of the blown air. By adding a parameter to the control data in this manner, the degree of temperature rise from the first room temperature can be grasped with high accuracy.

(10-5) Feature 5
The control data in this embodiment is generated so that the lower the first room temperature, the lower the temperature of the blown air, which makes it possible to reduce the difference between the first room temperature and the temperature of the air blown out of the air conditioner (10), and thus to reduce the buoyancy acting on the blown out air.

(10-6) Feature 6
The first heating operation in this embodiment is performed with the air temperature at a distance of 0.3 m from the floor surface of the indoor space (S) set as room temperature.

According to this embodiment, the air temperature 0.3 m above the floor surface is the temperature at which a user in the indoor space (S) feels cold or warm. By determining the first condition using this temperature as the room temperature and executing the first heating operation, the comfort for the user in the indoor space (S) can be improved.

(11) Modifications Modifications of the above embodiment will be described below. Only configurations different from the above embodiment will be described below, and descriptions of configurations that are the same as the above embodiment will be omitted.

(11-1) Modification 1
The first control section (C1) according to the first modification has a first control mode in which the temperature of the air blown out of the indoor unit (40) is reduced when it is determined that a second condition is satisfied, that is, the total heat amount of the air in the indoor space (S) during a first period is lower than the total heat amount of the air processed by the air conditioning apparatus (10) during the first period.

The first period is any period during operation of the air conditioning apparatus (10). The first period may be a period from the start of execution of the first heating operation until a predetermined time has elapsed, or may be a period during normal heating operation after execution of the first heating operation has ended.

The total heat quantity of the indoor air is calculated based on the volume of the indoor space (S) and the change in room temperature over time during the first period. The first control unit (C1) of this modified example has a calculation unit (not shown). The calculation unit calculates and processes the total heat quantity of the air in the indoor space (S). In this manner, the first control unit (C1) calculates the total heat quantity of the indoor air.

The total heat amount of the air processed by the air conditioner (10) is calculated by a calculation unit based on the change over time in the condensation temperature of the indoor heat exchanger (53) and the temperature of the blown air during the first period. That is, the first control unit (C1) calculates the total heat amount of the air processed by the air conditioner. The total heat amount of the air processed by the air conditioner may be calculated based on the condensation temperature of the indoor heat exchanger (53) during the first period, the temperature of the blown air, and the amount of air sucked in through the intake port (46), etc.

The operation of the first control unit (C1) when the first control mode is executed will be described with reference to FIG. 7. Note that when a command to stop operation is sent from the remote controller (60) in the middle of the flow chart shown in FIG. 7, the operation of the first control unit (C1) ends.

In step S21, the first control unit (C1) determines whether or not the first period has elapsed. If it is determined that the first period has elapsed (YES in step S21), step S22 is executed. If it is determined that the first period has not elapsed (NO in step S21), step S21 is executed again.

In step S22, the first control unit (C1) determines whether the second condition is satisfied. The second condition is a condition indicating that the total heat quantity of the air in the indoor space (S) during the first period is lower than the total heat quantity of the air processed by the air conditioner (10) during the first period. For example, assume that the air conditioner (10) processes a heat quantity equivalent to 7 kW during the first period, and a heat quantity equivalent to 2 kW is actually given to the air in the indoor space (S). In this case, as shown in FIG. 8, if the predicted room temperature at the end of the first period is set as the set temperature (dashed line in FIG. 8), the actual temperature of the indoor space (S) (solid line in FIG. 8) is lower than the set temperature. If it is determined that such a second condition is satisfied (YES in step S22), step S23 is executed. If it is determined that the second condition is not satisfied (NO in step S22), the first control mode is not executed, and the air conditioner (10) executes normal heating operation.

In step S23, the first control unit (C1) executes the first control mode to reduce the temperature of the air blown out of the air outlet (47).

In step S24, the first control unit (C1) determines whether the room temperature has reached the set temperature. If it is determined that the room temperature has reached the set temperature (YES in step S24), step S25 is executed. If it is determined that the room temperature has not reached the set temperature (NO in step S24), the first control mode continues and step S24 is executed again.

In step S25, the first control unit (C1) ends the execution of the first control mode. Thereafter, the air conditioning apparatus (10) executes normal heating operation.

In this way, in the first variant, the air conditioner (10) blows air downward from the top of the indoor space (S), and the control device (C) further includes a first control mode in which, when a second condition is determined that the total heat quantity of the air in the indoor space (S) during a first period is lower than the total heat quantity of the air processed by the air conditioner (10) during the first period, the control device (C) lowers the temperature of the air blown from the air conditioner (10) into the indoor space (S).

The first control mode is executed when the room temperature does not rise as expected by the air conditioner (10). Cases when the room temperature does not rise as expected by the air conditioner (10) include, for example, when warm air accumulates at the top of the room space (S), causing temperature unevenness in the room space (S), or when heat is released to the outside from a window or a vent fan in the room space (S), and the room temperature in the room space (S) is heated only by conductive heat transfer from the ceiling downward. By executing the first control mode in this way, the temperature of the air blown out by the indoor unit (40) is lowered, and the warm air that has accumulated at the top of the room space (S) can be sent to the bottom.

(11-2) Modification 2
The first control section (C1) of Modification 2 has a first control mode different from that of Modification 1. The first control mode of Modification 2 is a mode in which, when it is determined that the second condition is satisfied, the speed of the air blown out of the indoor unit (40) is increased.

The operation of the first control unit (C1) in Modification 2 is the same as that of the first control unit (C1) in Modification 1 except for step S23. In step S23 of Modification 2, the first control unit (C1) increases the wind speed of the air blown out of the indoor unit (40).

In this way, in the second variant, the air conditioner (10) blows air downward from the top of the indoor space (S), and the control device (C) further includes a first control mode in which, when a second condition is determined that the total heat quantity of the air in the indoor space (S) during a first period is lower than the total heat quantity of the air processed by the air conditioner (10) during the first period, the control device (C) increases the wind speed of the air blown from the air conditioner (10) into the indoor space (S).

In the first control mode of variant 2, the airflow in the indoor space (S) is used to mix the air, thereby suppressing temperature variations in the indoor space (S) and making the room temperature uniform.

(11-3) Modification 3
The first control unit (C1) according to the third modification detects changes in the room temperature at regular intervals after the first heating operation starts until the room temperature reaches the set temperature, and adjusts the temperature or wind speed of the blown air if the detected temperature has not reached the predetermined temperature.

As shown in FIG. 9 specifically, a period A is set from the start of the first heating operation until a predetermined temperature T (T=t3 in FIG. 9) is reached, and the period A has n consecutive (n=3 in FIG. 9) fixed periods a (a1, a2, ... an). The length of each fixed period a is the same. In addition, estimated temperatures t1, t2, ... tn that the room temperature is estimated to reach when the fixed period a has elapsed are set. Each estimated temperature tn is set to correspond to each fixed period a. In this way, the first control unit (C1) adjusts the heating capacity if the room temperature has not reached the estimated temperature tn when each fixed period a has elapsed from the start of the first heating operation until the period A has elapsed (solid line in FIG. 9).

The operation of the first control unit (C1) in Modification 3 will be described below with reference to FIG. 10. In the following example, period A has three periods a (a1, a2, a3). In addition, steps S31 to S36 in the above embodiment are the same as steps S11 to S16 in the above embodiment, and therefore their description will be omitted.

In step S37, the first control unit (C1) determines whether a certain period a1 has elapsed since the start of the first heating operation. If it is determined that the certain period a1 has elapsed (YES in step S37), step S38 is executed. If it is determined that the certain period a1 has not elapsed (NO in step S37), step S37 is executed again.

In step S38, the first control unit (C1) determines whether the room temperature is less than the estimated temperature t1. If it is determined that the room temperature is less than the estimated temperature t1 (YES in step S38), step S39 is executed. If it is determined that the room temperature is equal to or greater than the estimated temperature t1 (NO in step S38), step S40 is executed.

In step S39, the first control unit (C1) further reduces the blowing temperature of the air conditioner (10). Here, the degree of reduction in the blowing temperature may be determined based on the difference between the room temperature after the fixed period a has elapsed and the estimated temperature t, or may be constant regardless of the room temperature after the fixed period a has elapsed.

In step S40, the first control unit (C1) determines whether the fixed period a2 has elapsed. If it is determined that the fixed period a2 has elapsed (YES in step S40), step S41 is executed. If it is determined that the fixed period a2 has not elapsed (NO in step S40), step S40 is executed again.

In step S41, the first control unit (C1) determines whether the room temperature is less than the estimated temperature t2. If it is determined that the room temperature is less than the estimated temperature t2 (YES in step S41), step S43 is executed. If it is determined that the room temperature is equal to or greater than the estimated temperature t2 (NO in step S41), step S42 is executed.

In step S42, the first control unit (C1) reduces the temperature of the air blown out from the air conditioner (10).

In step S43, the first control unit (C1) determines whether the fixed period a3 has elapsed. If it is determined that the fixed period a3 has elapsed (YES in step S43), step S44 is executed. If it is determined that the fixed period a3 has not elapsed (NO in step S43), step S43 is executed again.

In step S44, the first control unit (C1) determines whether the room temperature has reached the set temperature. If it is determined that the room temperature has reached the set temperature (YES in step S44), this control ends, and the air conditioning device (10) performs normal heating operation. If it is determined that the room temperature has not reached the set temperature (NO in step S44), step S45 is executed.

In step S45, the first control unit (C1) reduces the temperature of the air blown out from the air conditioner (10).

In this manner, in this modified example, if the air temperature in the indoor space (S) is not at the set temperature even after the first heating operation is performed, the air temperature in the indoor space (S) can be brought closer to the set temperature by further performing the first heating operation.

(11-4) Modification 4
As shown in FIG. 11 , the first control unit (C1) of the fourth modification controls a ventilation device (70) provided in the indoor space (S). The first control unit (C1) and the ventilation device (70) are communicatively connected by a third communication line (W3). The ventilation device (70) may be any device capable of ventilating the interior and exterior of the indoor space (S). For example, the ventilation device (70) has a supply fan (not shown) that supplies air from the exterior to the indoor space (S) and an exhaust fan (not shown) that exhausts air from the indoor space (S) to the exterior. The supply fan and the exhaust fan are respectively disposed in different air passages provided in the ventilation device (70).

The supply air fan and exhaust fan are driven by fan motors controlled by the first control unit (C1). The airflow of the supply air fan and exhaust fan is controlled by the first control unit (C1). The airflow of the supply air fan and exhaust fan is adjusted to be the same.

In the fourth modification, the first control unit (C1) measures the carbon dioxide concentration in the indoor space (S). Specifically, a CO2 sensor that detects the carbon dioxide concentration is placed in the indoor space (S), and the CO2 sensor is connected to the first control unit (C1) so as to be able to communicate wirelessly or by wire. The CO2 sensor may be provided at any position in the indoor space (S), but is preferably provided near the room temperature sensor or at the same height from the floor as the room temperature sensor (81).

When the first control unit (C1) of the fourth modified example determines that the second condition is satisfied, that is, that the carbon dioxide concentration in the indoor space (S) is equal to or lower than a predetermined value, the first control unit (C1) stops the operation of the ventilation device (70). Here, the predetermined value may be, for example, a value equal to or higher than the average carbon dioxide concentration contained in the air.

The operation of the first control unit (C1) in Modification 4 will be described below with reference to FIG. 12. Note that steps S51 to S56 are the same as steps S11 to S16 in the above embodiment, and therefore their description will be omitted.

In step S57, the first control unit (C1) determines whether the third condition, that is, the carbon dioxide concentration in the indoor space (S) is equal to or lower than a predetermined value, is satisfied. If it is determined that the third condition is satisfied (YES in step S57), step S58 is executed. If it is determined that the third condition is not satisfied (NO in step S57), step S57 is executed again.

In step S58, the first control unit (C1) stops the operation of the ventilation device (70). That is, the first control unit (C1) stops the operation of the supply air fan and the exhaust air fan of the ventilation device (70).

In step S58, the first control unit (C1) may reduce the airflow rate of the supply air fan and the exhaust air fan to reduce the ventilation rate of the air in the indoor space (S).

In this manner, in the fourth modification, the control device (C) controls the ventilation device (70) that ventilates the indoor space (S), and has a second control mode in which, when the control device (C) determines that the third condition is met, that is, that the carbon dioxide concentration in the indoor space (S) is equal to or lower than a predetermined value during the first heating operation, the control device (C) stops the operation of the ventilation device (70) or reduces the amount of air to be ventilated.

As a result, when the carbon dioxide concentration in the indoor space (S) is below a specified value, it is assumed that ventilation of the indoor space (S) is unnecessary or can be reduced, and by setting the ventilation volume of the air in the indoor space to roughly zero, priority can be given to quickly heating the indoor space (S) to the set temperature.

(11-5) Modification 5
The first control section (C1) of the fifth modification has a fourth control mode in which, during a second period in which the air conditioner (10) performs thermo-off during heating operation, the indoor fan (52) is operated to perform a blowing operation.

The first control unit (C1) of the fifth modified example causes the air conditioner (10) to execute a thermo-off mode. Thermo-off is a mode in which the operation of the air conditioner (10) is automatically suspended when the room temperature rises to, for example, a set temperature while the air conditioner (10) is operating. When thermo-off is executed, the air conditioner (10) stops conditioning the indoor space (S). Specifically, while thermo-off is being executed, the compressor (21) is stopped and the indoor heat exchanger (53) does not function as a radiator or is in a state where it barely functions, so that the air conditioning of the indoor space (S) by the air conditioner (10) is stopped.

Thermo-on, on the other hand, is a mode in which the operation of the air conditioner (10) is automatically resumed when the room temperature reaches a specified temperature while thermo-off is being executed. Specifically, when thermo-on is executed, the operation of the compressor (21) or the indoor fan (52), which was stopped when thermo-off was executed, is resumed. When the indoor fan (52) is resumed, the compressor (21) operates at normal capacity.

In the fan operation in the fourth control mode, the first control section (C1) operates the indoor fan (52) at an air volume greater than the minimum air volume with the compressor (21) stopped. In other words, in the fan operation in the fourth control mode, the first control section (C1) operates the indoor fan (52) at an air volume that allows air near the air outlet (47) to reach the floor surface with the thermostat off.

The second period may be a period in which Thermo Off and Thermo On are repeated continuously, and in which the room temperature rises and falls around the set temperature. In this second period, Thermo Off and Thermo On are executed continuously, and the room temperature may change within a range of ±2°C from the set temperature, or within a range of ±1.5°C from the set temperature, or within a range of ±1°C from the set temperature, or within a range of ±0.5°C from the set temperature.

In this manner, in the fifth modification, the air conditioner (10) blows air from the top to the bottom of the indoor space (S), and the control device (C) has a third control mode in which the air conditioner (10) performs a blowing operation in which the conveyor (52) is operated during a second period in which the thermo-off is performed during heating operation.

As a result, the air temperature in the indoor space (S) reaches the set temperature when the thermo-off is executed. In this case, since warm air tends to accumulate at the top of the indoor space (S), the third control mode can be executed to deliver the warm air to the bottom.

(11-6) Modification 6
In the sixth modification, the control device (C) controls a plurality of air conditioners (10). The plurality of air conditioners (10) conditions the same indoor space (S). Specifically, a plurality of indoor units (40) are provided in the indoor space (S). The plurality of indoor units (40) are connected to different outdoor units (20). In this example, the control device (C) is provided separately from the plurality of air conditioners (10).

The control device (C) has a fourth control mode in which, while at least one air conditioner (10) is performing a heating operation, at least one other air conditioner (10) is caused to perform a blowing operation by operating an indoor fan (52).

For example, as shown in FIG. 13, the control device (C) controls two air conditioners (10), and the two air conditioners (10) condition an indoor space (S). The control device (C) is communicatively connected to the first control units (C1) of the two air conditioners (10) via a fourth communication line (W4).

Two indoor units (40) are provided in the indoor space (S). Assume that the room temperature reaches the set temperature after the two air conditioners (10) have performed the first heating operation. At this time, the control device (C) causes one air conditioner (10) to continue the heating operation and switches the other air conditioner (10) to fan operation. In the fan operation, the control device (C) stops the operation of the compressor (21) and operates the indoor fan (52) at a predetermined wind speed. The fan operation increases the airflow circulating within the indoor space (S), making it possible to prevent unevenness in the room temperature.

In another example, when the control device (C) determines that the amount of heat given to the air in the indoor space (S) during a certain period is less than the amount of heat processed by the two air conditioners during the certain period, it causes one air conditioner (10) to continue heating operation and the other air conditioner (10) to switch to fan operation. This makes it possible to continue heating operation while lowering the relatively warm air that has accumulated at the top of the indoor space (S) downward.

Thus, in the sixth modification, the control device (C) has a fourth control mode in which, while at least one air conditioner (10) is performing a heating operation, at least one other air conditioner (10) performs a blowing operation in which the conveyor (52) is operated.

(12) Other Embodiments The above embodiment and each of the above modified examples may be configured as follows.

The first heating operation may be performed by fixing the wind speed of the blown air and controlling only the temperature of the blown air. In other words, the first heating operation may be performed by blowing air toward the floor surface at a blown air temperature that prevents the air blown downward from the air conditioner (10) from rising.

In the first heating operation, the first control unit (C1) may control the flap (57a) according to the temperature distribution in the indoor space (S). The temperature distribution is generated, for example, based on temperature information acquired from a plurality of room temperature sensors (81) arranged in the indoor space (S). The first control unit (C1) changes the position of the flap (57a) so that the blown air reaches a position with a relatively low temperature from the generated temperature distribution. This allows the temperature to rise preferentially from the relatively low temperature positions, thereby allowing the room temperature to quickly reach the set temperature.

The control data may be acquired based on the position from which the blown air is blown out, in addition to the first room temperature and the temperature and wind speed of the blown air. For example, the higher the position of the air outlet (47) is from the floor surface, the more difficult it is for the blown air to reach the floor surface. Therefore, by adding the position of the air outlet (47) to the control data, the flexibility in installing the indoor unit (40) can be improved, and the first heating operation can be adapted to indoor spaces (S) of various sizes.

In the above embodiment, the first control unit (C1) may execute the first heating operation when it determines that the first condition is satisfied during the heating operation of the air conditioning device (10).

In the above embodiment and each of the above modified examples, the first control unit (C1) has been described as an example of the control device (C), but the second control unit (C2) or the third control unit (C3) may be the control device (C). In other words, the second control unit (C2) or the third control unit (C3) may execute the first heating operation, the first control mode, the second control mode, the third control mode, or the fourth control mode.

In the above embodiment, the first control unit (C1) is described as an example of the control device (C), but the control device (C) does not have to be provided in the air conditioner (10). For example, the control device (C) may be provided separately from the air conditioner (10) and may communicate with the air conditioner (10). In this case, the control device (C) may communicate with the outdoor unit (20), the indoor unit (40), or the remote controller (60). More specifically, when the air conditioner (10) is provided in a building and the indoor units (40) are arranged in each of a plurality of rooms, the control device (C) may be provided in a centralized management device that centrally manages the air conditioner (10), or may be provided in a BEMS (Building Energy Management System) that manages lighting equipment and the like in the building.

In the above embodiment, it has been described that when the first heating operation is performed, the first control unit (C1) selects the operating conditions that satisfy the conditions from the control data, but this is not limited to the above. For example, the user may specify the room temperature when the air reaches the floor surface, and the first control unit (C1) may select the operating conditions (temperature and speed of the blown air) that will result in the specified room temperature. As a specific example, assume that the room temperature when the air reaches the floor surface is set to 20°C based on the user's operation. In this case, the first control unit (C1) executes the first heating operation by selecting the operating conditions from the control data when the first condition is met, such that the temperature of the air when it reaches the floor surface is 20°C.

In the above embodiment, the control data does not have to be provided in the first control unit (C1) (control device (C)). For example, if the air conditioning device (10) is communicatively connected to a cloud or a specified server, the control data may be provided in such a cloud or specified server.

In the above embodiment, the control data may be created based on the difference between the first room temperature and the set temperature.

In the above embodiment, the first control unit (C1) does not need to have control data. The first control unit (C1) may execute the first heating operation based on, for example, a relational expression that indicates the relationship between the first room temperature, the temperature and air speed of the blown air, and the position of the air outlet (47).

In the above embodiment, the first heating operation may be an operation in which the blown air reaches the floor surface. In this case, if there is a location in the indoor space (S) where the wind speed is 0.3 m/s or more at a height of 0.1 m from the floor surface, it may be determined that the air reaches the floor surface.

In the above embodiment, the control data may be obtained by machine learning. For example, a predetermined estimation model may be generated by performing so-called "supervised learning" in which the room temperature when the first condition is met and the temperature and wind speed of the blown air are used as input data, and the room temperature when the first heating operation is performed is used as teacher data. This generated estimation model becomes the control data. The input data may also include the position of the air outlet (47) in the indoor space (S).

In the above embodiment, the air conditioning device (10) does not need to have control data at the time of product shipment. The air conditioning device (10) only needs to have a predetermined program capable of generating control data.

The air conditioning device (10) does not need to have a control device (C), but may have a program capable of executing the operation of the control device (C).

The air conditioner (10) may be a so-called building multi-type air conditioner. That is, the air conditioner (10) may be configured such that one outdoor unit (20) and multiple indoor units (40) are connected to a liquid connection pipe (12) and a gas connection pipe (13).

A plurality of indoor units (40) may be arranged in the same indoor space (S). In other words, the air conditioning device (10) may include a plurality of indoor units (40) that condition the same indoor space (S).

The indoor unit (40) may be a so-called wall-mounted type that is installed on the wall of the indoor space. In this case, the air outlet (47) may be located at a position higher than the height of a person, for example, at a position of 2.0 m or more, 2.5 m or more, or 3.0 m or more.

The indoor unit (40) need only have an air outlet (47) and may not have an indoor heat exchanger (53). For example, the air conditioner (10) may have an indoor unit (40) connected to a duct. In this case, air treated by a specific heat exchanger flows through the duct by the conveyor (52) and is blown out from the air outlet (47). A plurality of such indoor units (40) may be arranged in the indoor space (S), and a duct is connected to each indoor unit (40). In addition, the indoor unit (40) may not have a movable flap (57a).

The air conditioner (10) need only have an outlet (47) through which the air processed by the indoor heat exchanger is blown out into the indoor space (S), and need not have an indoor unit (40). The air conditioner (10) need not have an outdoor expansion valve (23). The outlet (47) may be provided in the ceiling or wall of the indoor space (S).

The room temperature may be at a height of 1.6 m or less from the floor of the indoor space (S). The room temperature sensor (81) may be at a height of 0 m, 0.6 m, 0.9 m, 1.2 m, 1.4 m, or 1.6 m from the floor. The room temperature sensor (81) may also be provided on a piece of furniture that is at a height of 1.6 m or less from the floor.

The air conditioner (10) may be of an indirect expansion type. For example, the air conditioner (10) includes a chilling unit. A compressor (21), an outdoor heat exchanger (22), an outdoor expansion valve (23), and a cooler (not shown) are connected to the refrigerant circuit of the air conditioner (10). The heat medium flowing through the indoor heat exchanger (53) is a circulating liquid such as water or brine. The circulating liquid is circulated between the indoor heat exchanger (53) and the cooler by a specified pump. The circulating liquid is cooled by exchanging heat with the refrigerant in the cooler.

The first heating operation may be performed while the operation is stopped. In other words, even if the air conditioning apparatus (10) is energized but is not operating, the first control unit (C1) may determine that the first condition is satisfied and perform the first heating operation.

In the above embodiment, the heating operation may include a thermo-off state. In other words, even if the first condition is determined to be satisfied in the thermo-off state, the first heating operation may be performed.

In the above embodiment, the air conditioner (10) only needs to be able to detect the temperature at a height of 0.6 m above the floor, and the room temperature sensor (81) need not be provided at this height. For example, a temperature sensor may be provided to detect the air temperature at the intake port (46) of the indoor unit (40), and the air temperature at a height of 0.6 m above the floor may be estimated based on the temperature of the intake air. Alternatively, a device for transmitting and receiving ultrasonic waves may be provided to calculate the temperature at a height of 0.6 m above the floor based on the time from when the ultrasonic waves are transmitted to when they are received and the path length of the ultrasonic waves. In addition, even if the room temperature cannot be detected in the above embodiment, the first heating operation may be performed based on the date, time, weather, outdoor temperature, past room temperature information, and the like.

The room temperature sensor (81) may be provided near the air inlet (46) of the indoor unit (40). In this case, the temperature of the air inlet to the indoor unit (40) is regarded as the room temperature.

In the above embodiment, the first control unit (C1) may execute the first heating operation for a predetermined period of time. For example, in step S24, the first control unit (C1) may stop or end the execution of the first heating operation when a predetermined period of time has elapsed since the start of execution of the first heating operation. In this case, if the room temperature is lower than the set temperature when the predetermined period of time has elapsed, the first heating operation may be resumed. In other words, the first control unit (C1) may further execute the first heating operation when the air temperature in the indoor space (S) is lower than the set temperature after execution of the first heating operation.

In the operation of the first control unit (C1) in the above variant example 1, if it is determined in step S24 that the room temperature has not reached the set temperature (NO in step S24), the first control unit (C1) may further reduce the temperature of the blown air.

The air conditioning device (10) may be configured to select whether or not to execute the first heating operation, the first control mode, the second control mode, the third control mode, or the fourth control mode based on a user's operation. In this case, for example, when "ON" for the first heating operation is input to the remote controller, the remote controller (60) sends a command to execute the first heating operation to the first control unit (C1) when the first condition is met. On the other hand, when "ON" for the first heating operation is not input to the remote controller, the first control unit (C1) does not execute the first heating operation even if the first condition is met.

In the above embodiment, the temperature of the air blown out during the first heating operation may be lower than the control range of the air blown out during normal heating operation. For example, in normal heating operation, if the maximum value of the control range of the temperature of the blown out air is 43°C and the air is set to be blown out at 41°C, the temperature of the air blown out during the first heating operation may be lower than 41°C.

In the above embodiment and each of the above modified examples, the operation of the air conditioner (10) may be controlled by, for example, a centralized management device that centrally manages multiple air conditioners (10) in a building, or may be controlled by an electronic terminal such as a smartphone or tablet.

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

As described above, the present disclosure is useful for control devices and air conditioning devices.

10. Air conditioning equipment
11 Refrigerant circuit
40 Indoor unit
47 Air outlet
52 Indoor fan (conveyor)
57 Airflow control unit
70 Ventilation system
C. Control device
S Interior space

Claims (14)

A control device for controlling an air conditioner (10) that has a refrigerant circuit and conditions an indoor space (S) by executing a refrigeration cycle,
determining whether or not a first condition is satisfied, that is, when the air temperature in the indoor space (S) is set to room temperature, the room temperature is equal to or lower than a predetermined temperature;
When the first condition is satisfied, a control device executes a first heating operation in which air is blown toward the floor surface at a blown air temperature, or at a blown air temperature and wind speed, that prevents the air blown downward from the air conditioning device (10) from rising. The control device according to claim 1, wherein, in the first heating operation, air having a temperature lower than a control range of the blown air temperature determined based on the room temperature and a set temperature is blown out from the air conditioner (10). When the room temperature when the first condition is satisfied is a first room temperature,
The control device according to claim 1 or 2, which executes the first heating operation based on predetermined data indicating a change in the first room temperature obtained based on the first room temperature and the temperature of the air blown out at the first room temperature. The control device according to claim 3 , wherein the predetermined data is further acquired based on a wind speed of the blown air or a position in the indoor space (S) from which the blown air is blown out. The control device according to claim 3 , wherein the predetermined data is generated such that the temperature of the blown air is lower as the first room temperature is lower. The air conditioner (10) includes an indoor unit (40) having an air outlet (47) for blowing air into the indoor space (S),
The indoor unit (40) has an airflow direction adjustment part (57) that is provided at the air outlet (47) and adjusts the airflow direction,
The control device according to claim 1 or 2, wherein, in the first heating operation, the airflow direction adjustment part (57) is controlled in accordance with a temperature distribution in the indoor space (S). The control device according to claim 1 or 2, wherein the first heating operation is performed with an air temperature at a position 1.6 m or less above a floor surface of the indoor space (S) set as the room temperature. 3. The control device according to claim 1, further comprising a first control mode in which, when a second condition is determined in which a total heat amount of the air in the indoor space (S) during a first period is lower than a total heat amount of the air processed by the air conditioning device (10) during the first period, a temperature of the blown air is reduced. 3. The control device according to claim 1, further comprising a first control mode that increases a wind speed of the blown air when a second condition is determined in which a total heat amount of the air in the indoor space (S) during a first period is lower than a total heat amount of the air processed by the air conditioning device (10) during the first period. The control device according to claim 1 or 2, wherein, when the room temperature is lower than a set temperature after the first heating operation is performed, the control device continues or further performs the first heating operation. Controlling a ventilation device (70) that ventilates the indoor space (S);
3. The control device according to claim 1, further comprising a second control mode which stops operation of the ventilation device (70) or reduces an amount of air to be ventilated when it is determined that a third condition is satisfied, that is, that a carbon dioxide concentration in the indoor space (S) is equal to or lower than a predetermined value, during execution of the first heating operation. The air conditioning device (10) includes a conveyor (52) that conveys air to the indoor space (S), and blows air from above toward below the indoor space (S).
3. The control device according to claim 1, further comprising a third control mode for executing a blowing operation in which the conveyor (52) is operated during a second period in which the air conditioner (10) performs a thermo-off operation during a heating operation. The air conditioning system (10) includes a conveyor (52) that conveys air to the indoor space (S),
3. The control device according to claim 1 or 2, further comprising a fourth control mode for controlling a plurality of the air conditioners (10) that condition the same indoor space (S), and causing at least one of the air conditioners (10) to perform a blowing operation in which the conveyor (52) is operated while at least another of the air conditioners (10) is performing a heating operation. An air conditioner equipped with the control device according to claim 1 or 2.