Air Conditioning Equipment

Abstract

It achieves both air conditioning performance and energy saving effects. [Solution] The air conditioner (1) includes a compressor (12) and a controller (C) that controls the compressor (12). The controller (C) is capable of executing a first mode in which the rotation speed of the compressor (12) is controlled so that the air conditioning capacity value is equal to or less than an upper limit value, and the first mode is a mode in which the air conditioning capacity value in a state in which a condition is established in which the difference between the indoor temperature and a target temperature is equal to or less than a first predetermined value is set as a reference capacity value, and a first value lower than the reference capacity value is set as an upper limit value.

Description

[Technical field]

[0001] The present disclosure relates to an air conditioning apparatus. [Background technology]

[0002] Patent Document 1 discloses an air conditioner equipped with a control unit that controls the compressor current to be equal to or less than a current threshold. In the air conditioner described in Patent Document 1, the current threshold is set based on the design maximum value of the current. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP2021-124228 Public Relations Summary of the Invention [Problem to be solved by the invention]

[0004] As described in Patent Document 1, if an upper limit is set for the current supplied to the compressor, the deterioration of the power consumption rate can be suppressed, and energy saving effects are expected. However, if the current threshold is too small, the air conditioning performance cannot be fully demonstrated. Conversely, if the current threshold is too large, the current rarely reaches the current threshold, and the energy saving effect is reduced.

[0005] The present disclosure aims to achieve both air conditioning performance and energy saving effects. [Means for solving the problem]

[0006] The first aspect is directed to an air conditioner capable of at least one of cooling operation and heating operation. The air conditioner includes a compressor (12) and a controller (C) that controls the compressor (12). The controller (C) is capable of executing a first mode in which the rotation speed of the compressor (12) is controlled so that the air conditioning capacity value is equal to or less than an upper limit value, and the first mode is a mode in which the air conditioning capacity value in a state in which a condition is established in which the difference between the indoor temperature and a target temperature is equal to or less than a first predetermined value is set as a reference capacity value, and a first value lower than the reference capacity value is set as the upper limit value.

[0007] In the first aspect, the compressor (12) can be operated at a high rotation speed until the room temperature approaches the target temperature, and sufficient air conditioning performance can be achieved. On the other hand, when the room temperature is close to the target temperature, the air conditioning load is relatively low, and therefore the rotation speed of the compressor (12) may be low. By lowering the rotation speed of the compressor (12) so as to keep the air conditioning capacity value even lower than the reference capacity value, it is possible to increase the energy saving effect. Therefore, it is possible to achieve both air conditioning performance and energy saving effect.

[0008] In a second aspect, in the first aspect, the first value is a variable value that varies based on the reference ability value.

[0009] For example, when the difference between the outside air temperature and the target temperature is large, the air conditioning capacity value is likely to be higher even if the target temperature is the same, compared to when the difference is small. By setting the first value as a variable value as in the second aspect, it is possible to enhance energy saving effects while fully demonstrating the air conditioning performance.

[0010] In a third aspect, in the second aspect, the first value is higher when an air conditioning load is high than when the air conditioning load is low.

[0011] For example, when the indoor temperature is higher than the target temperature during cooling operation, or when the indoor temperature is lower than the target temperature during heating operation, the air conditioning load becomes high. As in the third aspect, by increasing the first value when the air conditioning load is high, the air conditioning performance can be fully exhibited. On the other hand, by making the first value as small as possible when the air conditioning load is low, a high energy saving effect can be obtained.

[0012] In a fourth aspect, in the third aspect, when the air conditioning load becomes high, the controller (C) changes the upper limit value to a second value higher than the first value, thereby controlling the rotation speed of the compressor (12).

[0013] In the fourth aspect, by changing the upper limit to the second value when the air conditioning load is high, the rotation speed of the compressor (12) can be increased, and the air conditioning performance can be fully exhibited.

[0014] In a fifth aspect, in the fourth aspect, when the air conditioning load is low, the controller (C) changes the upper limit value to a third value lower than the second value, and controls the rotation speed of the compressor (12).

[0015] In the fifth aspect, the upper limit value is changed to the third value when the air conditioning load is low, thereby making it possible to improve the energy saving effect.

[0016] In a sixth aspect, in any one of the first to fifth aspects, when the state in which the indoor temperature is equal to or lower than the target temperature continues for a predetermined time or longer during the cooling operation, or when the state in which the indoor temperature is equal to or higher than the target temperature continues for a predetermined time or longer during the cooling operation, the controller (C) changes the upper limit value to a fourth value lower than the first value, and controls the rotation speed of the compressor (12).

[0017] For example, during cooling operation, if the indoor temperature remains below the target temperature for a predetermined period of time, the indoor temperature can be maintained close to the target temperature even if the air conditioning capacity value is further reduced, unless the external environment changes significantly. In such a situation, if the upper limit is further tightened, as in the sixth aspect, the energy saving effect can be further increased.

[0018] The seventh aspect is the first aspect, wherein said first value is a value that varies depending on a setting by a user.

[0019] In the seventh aspect, the user controls the upper limit value by himself / herself, so that it is possible to achieve an energy saving effect and to prevent the user's comfort from decreasing.

[0020] In an eighth aspect, in any one of the first to seventh aspects, when a predetermined thermo-off condition is satisfied, the controller (C) stops the compressor (12) and resets the reference capacity value and the upper limit value, and when the state changes from one in which the thermo-off condition was satisfied to one in which the thermo-off condition is no longer satisfied, the controller (C) operates the compressor (12) and resets the reference capacity value and the first value based on the air conditioning capacity value after the state in which the thermo-off condition is no longer satisfied, and controls the rotation speed of the compressor (12) with the reset first value as the upper limit value.

[0021] When the compressor (12) is temporarily stopped and then restarted, there is a high possibility that the required air conditioning capacity value will change from that before the compressor (12) was stopped. As in the eighth aspect, after the compressor (12) is temporarily stopped, the reference capacity value and the first value are reset based on the air conditioning capacity value after the compressor (12) is restarted, whereby the compressor (12) can be controlled so as to easily exert air conditioning performance and to increase energy saving effects.

[0022] In a ninth aspect, in any one of the first to eighth aspects, when the target temperature is changed to a lower temperature during the cooling operation, or when the target temperature is changed to a higher temperature during the heating operation, the controller (C) resets the standard capacity value and the upper limit value, and re-sets the standard capacity value and the first value based on the air conditioning capacity value in a state where a condition is met in which the difference between the indoor temperature and the changed target temperature is equal to or less than a predetermined value, and controls the rotation speed of the compressor (12) using the reset first value as the upper limit value.

[0023] In the ninth aspect, for example, when the target temperature is changed to a lower temperature during cooling operation, the reference capacity value and the upper limit value are reset, so that the rotation speed of the compressor (12) can be increased. If the rotation speed of the compressor (12) can be increased, the changed target temperature can be reached more quickly. When the room temperature approaches the target temperature, the reference capacity value and the first value are reset to reduce the rotation speed of the compressor, so that the energy saving effect can be increased.

[0024] In a tenth aspect, in any one of the first to ninth aspects, the controller (C) interrupts the first mode when, during the cooling operation, the indoor temperature becomes higher than the target temperature by a second predetermined value that is greater than the first predetermined value, or when, during the heating operation, the indoor temperature becomes lower than the target temperature by the second predetermined value or more.

[0025] When there is a large deviation from the target temperature, it is necessary to operate the air conditioner at the highest possible air conditioning capacity value in order to quickly reach the target temperature. By interrupting the first mode as in the tenth aspect, the target temperature can be reached quickly, improving the comfort of the user.

[0026] In an eleventh aspect, in any one of the first to tenth aspects, the controller (C) interrupts the first mode when the indoor temperature becomes equal to or higher than a first predetermined temperature during the cooling operation, or when the indoor temperature becomes equal to or lower than a second target temperature that is lower than the first predetermined temperature during the heating operation, while the first mode is being executed.

[0027] In the eleventh aspect, when the indoor temperature is too high or too low, the first mode is interrupted and the air conditioner is operated at the highest possible air conditioning capacity value, thereby making it possible to maintain the indoor temperature at an appropriate temperature, thereby improving user comfort.

[0028] A twelfth aspect is any one of the first to eleventh aspects, wherein the air conditioning capacity value is the amount of power consumed by the air conditioner.

[0029] In the twelfth aspect, by using the power consumption amount, which is directly related to energy saving, as the air conditioning capacity value and setting the upper limit value when the indoor temperature is close to the target temperature, a high energy saving effect can be expected in the first mode. [Brief description of the drawings]

[0030] [Figure 1] FIG. 1 is a schematic overall configuration diagram of an air conditioner according to an embodiment. [Diagram 2] FIG. 2 is a configuration diagram showing refrigerant piping and air flow in the air conditioner. [Diagram 3] FIG. 3 is a vertical cross-sectional view of the air conditioning indoor unit. [Figure 4] FIG. 4 is a block diagram including the main elements of an air conditioning device. [Diagram 5] FIG. 5 is a diagram showing the connection relationship of electrical wiring in the air conditioning apparatus. [Figure 6] FIG. 6 is a part of a flowchart showing the processing operation of the controller in the energy saving mode during cooling operation. [Figure 7] FIG. 7 is a part of a flowchart showing the processing operation of the controller in the energy saving mode during cooling operation. [Figure 8] FIG. 8 is the remaining part of the flowchart showing the processing operation of the controller in the energy saving mode during cooling operation. [Figure 9] FIG. 9 is a part of a flowchart showing the processing operation of the controller in the energy saving mode during heating operation. [Figure 10] FIG. 10 is a part of a flowchart showing the processing operation of the controller in the energy saving mode during heating operation. [Figure 11] FIG. 11 is the remaining part of the flowchart showing the processing operation of the controller in the energy saving mode during heating operation. [Figure 12] FIG. 12 is an example of a time chart showing the relationship between the room temperature, the power consumption, and the air conditioning load in the energy saving mode during cooling operation. [Figure 13] FIG. 13 is another example of a time chart showing the relationship between the room temperature, the power consumption, and the air conditioning load in the energy saving mode during cooling operation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below, and various modifications are possible within the scope of the technical idea of ​​the present disclosure. Since each drawing is intended to conceptually explain the present disclosure, dimensions, ratios, or numbers may be exaggerated or simplified as necessary for easy understanding.

[0032] Exemplary embodiments will now be described in detail with reference to the accompanying drawings.

[0033] (1) Overview of air conditioning system configuration The air conditioner (1) adjusts the temperature and humidity of air in a room (I). As shown in FIG. 1, the air conditioner (1) has an air conditioner outdoor unit (10) and an air conditioner indoor unit (30). The air conditioner outdoor unit (10) is installed outdoors, and the air conditioner indoor unit (30) is installed indoors. The air conditioner (1) is a pair type having one air conditioner indoor unit (30) and one air conditioner outdoor unit (10). The air conditioner (1) has a function of humidifying and dehumidifying air. The air conditioner (1) further has a function of ventilating the room (I).

[0034] The air conditioner (1) has a humidity control unit (20) and an air conditioning unit (5). The humidity control unit (20) adjusts the humidity of the room (I), which is a target space. Strictly speaking, the humidity control unit (20) constitutes a humidification unit for humidifying the room air. In addition, the humidity control unit (20) also serves as a dehumidification unit for dehumidifying the room air. The air conditioning unit (5) adjusts the temperature of the air in the room (I), which is a target space. Strictly speaking, the air conditioning unit (5) heats and cools the room air.

[0035] As shown in Fig. 1 and Fig. 2, the air conditioner (1) has a hose (2), a liquid connection pipe (3), and a gas connection pipe (4). The air conditioning indoor unit (30) and the humidity control unit (20) are connected to each other via the hose (2). The air conditioning indoor unit (30) and the air conditioning outdoor unit (10) are connected to each other via the liquid connection pipe (3) and the gas connection pipe (4) in a refrigerant circuit (R) that is filled with a refrigerant. The refrigerant is difluoromethane. However, the refrigerant is not limited to difluoromethane. The refrigerant circuit (R) performs a vapor compression refrigeration cycle.

[0036] The refrigerant circuit (R) mainly includes a compressor (12), an outdoor heat exchanger (14), an expansion valve (15), a four-way switching valve (16), and an indoor heat exchanger (34).

[0037] The refrigerant circuit (R) performs a first refrigeration cycle or a second refrigeration cycle in response to switching of the four-way switching valve (16). The first refrigeration cycle is a refrigeration cycle in which the indoor heat exchanger (34) functions as an evaporator and the outdoor heat exchanger (14) functions as a heat radiator. The second refrigeration cycle is a refrigeration cycle in which the indoor heat exchanger (34) functions as a radiator and the outdoor heat exchanger (14) functions as an evaporator.

[0038] (2) Detailed configuration (2-1) Air conditioner outdoor unit As shown in Figures 2 and 4, the air conditioner outdoor unit (10) has an outdoor casing (11), a compressor (12), an outdoor fan (13), an outdoor heat exchanger (14), an expansion valve (15), and a four-way switching valve (16).

[0039] A partition plate (18) is provided inside the outdoor casing (11). The partition plate (18) divides the interior of the outdoor casing (11) into a first space (S1) and a second space (S2). The first space (S1) is provided with the compressor (12) and the outdoor heat exchanger (14). Strictly speaking, the first space (S1) is provided with the compressor (12), the outdoor fan (13), the outdoor heat exchanger (14), the expansion valve (15), and the four-way switching valve (16). The outdoor casing (11) is formed with an outdoor suction port (11a), an outdoor outlet port (11b), a moisture absorption side suction port (61a), and a moisture absorption side exhaust port (61b). The outdoor suction port (11a) is formed on the rear side of the outdoor casing (11). The outdoor suction inlet (11a) is an opening for drawing in outdoor air (air from outside the room). The outdoor outlet (11b) is formed on the front side of the outdoor casing (11). The outdoor outlet (11b) is an opening for blowing out air that has passed through the outdoor heat exchanger (14). An outdoor air passage (11c) is formed inside the outdoor casing (11) from the outdoor suction inlet (11a) to the outdoor outlet (11b).

[0040] The compressor (12) draws in and compresses a low-pressure gas refrigerant. The compressor (12) is driven by a first motor (M1). The compressor (12) is a variable displacement compressor in which power is supplied to the first motor (M1) from an inverter circuit. The compressor (12) is configured so that the operating capacity can be changed by adjusting the operating frequency (rotation speed) of the first motor (M1). The compressor (12) is a so-called high-pressure dome type compressor in which the inside is filled with high-pressure refrigerant. When the compressor (12) is in operation, heat generated by the compressor (12) is released to the surroundings. The power consumed by the compressor (12) depends on the rotation speed of the first motor (M1). Specifically, the power consumption is higher when the rotation speed of the first motor (M1) is high than when the rotation speed is low. In the following description, the term "rotation speed of the compressor (12)" refers to the rotation speed of the first motor (M1).

[0041] The outdoor fan (13) is disposed in the outdoor air passage (11c). The outdoor fan (13) is rotated by being driven by the second motor (M2). Air delivered by the outdoor fan (13) is sucked into the outdoor casing (11) through the outdoor suction port (11a). This air flows through the outdoor air passage (11c) and is blown out of the outdoor casing (11) through the outdoor outlet port (11b). The outdoor fan (13) delivers the outdoor air so as to pass through the outdoor heat exchanger (14).

[0042] The outdoor heat exchanger (14) is disposed in the outdoor air passage (11c) upstream of the outdoor fan (13). In this example, the outdoor heat exchanger (14) is a fin-and-tube heat exchanger. The outdoor heat exchanger (14) exchanges heat between the refrigerant flowing therethrough and the outdoor air transported by the outdoor fan (13).

[0043] The expansion valve (15) reduces the pressure of the refrigerant. The expansion valve (15) is an electrically operated expansion valve whose opening is adjustable. The pressure reducing mechanism may be a temperature sensitive expansion valve, an expander, a capillary tube, or the like. The expansion valve (15) may be connected to a liquid line of the refrigerant circuit (R) and may be provided in the air conditioner indoor unit (30).

[0044] The four-way switching valve (16) has a first port (P1), a second port (P2), a third port (P3), and a fourth port (P4). The first port (P1) is connected to the discharge port of the compressor (12). The second port (P2) is connected to the suction port of the compressor (12). The third port (P3) is connected to a gas end of the outdoor heat exchanger (14). The fourth port (P4) is connected to the gas connection pipe (4).

[0045] The four-way switching valve (16) can be switched between a first state (a state indicated by a solid line in FIG. 2) and a second state (a state indicated by a dashed line in FIG. 2). In the first state, the four-way switching valve (16) communicates between the first port (P1) and the third port (P3) and also communicates between the second port (P2) and the fourth port (P4). In the second state, the four-way switching valve (16) communicates between the first port (P1) and the fourth port (P4) and also communicates between the second port (P2) and the third port (P3).

[0046] (2-2) Air conditioning indoor unit As shown in Figures 1 to 3, the air conditioning indoor unit (30) is installed indoors. The air conditioning indoor unit (30) is a wall-mounted type that is installed on a wall (WL) of a room that forms the room (I). The air conditioning indoor unit (30) includes an indoor casing (31), an indoor fan (32), an air filter (33), an indoor heat exchanger (34) that is a utilization heat exchanger, a drain pan (35), and an air direction adjustment unit (36).

[0047] The indoor casing (31) accommodates the indoor fan (32), the air filter (33), the indoor heat exchanger (34), and the drain pan (35). The indoor casing (31) is formed with an indoor suction port (31a) and an indoor air outlet (31b). The indoor suction port (31a) is disposed on the upper side of the indoor casing (31). The indoor suction port (31a) is an opening for drawing in indoor air. The indoor air outlet (31b) is disposed on the lower side of the indoor casing (31). The indoor air outlet (31b) is an opening for blowing out air after heat exchange or air for humidity control. An indoor air passage (31c) continuing from the indoor suction port (31a) to the indoor air outlet (31b) is provided inside the indoor casing (31).

[0048] The indoor fan (32) is disposed approximately in the center of the indoor air passage (31c). The indoor fan (32) is, for example, a cross-flow fan. The indoor fan (32) is rotated by being driven by the fifth motor (M5). The indoor fan (32) takes in indoor air into the indoor air passage (31c) and transports the air. The air transported by the indoor fan (32) is sucked into the indoor casing (31) through the indoor inlet (31a). The air flows through the indoor air passage (31c) and is blown out of the indoor casing (31) through the indoor outlet (31b).

[0049] The indoor fan (32) transports indoor air so as to pass through the indoor heat exchanger (34). The air blown out through the indoor air outlet (31b) is supplied to the room (I). The indoor fan (32) is configured so that the air volume can be switched between a plurality of levels by adjusting the rotation speed of the fifth motor (M5).

[0050] The air filter (33) is disposed in the indoor air passage (31c) upstream of the indoor heat exchanger (34). The air filter (33) is attached to the indoor casing (31) so that substantially all of the air supplied to the indoor heat exchanger (34) passes through the air filter (33). The air filter (33) collects dust in the air sucked through the indoor suction port (31a).

[0051] The indoor heat exchanger (34) is disposed in the indoor air passage (31c) upstream of the indoor fan (32). In this example, the indoor heat exchanger (34) is a fin-and-tube heat exchanger. The indoor heat exchanger (34) exchanges heat between the refrigerant therein and the indoor air transported by the indoor fan (32).

[0052] The drain pans (35) are disposed on the front and rear lower sides of the indoor heat exchanger (34). The drain pans (35) receive condensation water generated inside the indoor casing (31) of the air conditioning indoor unit (30). The condensation water generated on the surfaces of the fins of the indoor heat exchanger (34) flows down along the surfaces due to its own weight and is received in the drain pan (35).

[0053] The airflow direction adjustment section (36) adjusts the direction of air blown out from the indoor air outlet (31b). The airflow direction adjustment section (36) has a flap (37). The flap (37) is in the shape of a long plate extending along the longitudinal direction of the indoor air outlet (31b). The flap (37) rotates when driven by a motor. The flap (37) opens and closes the indoor air outlet (31b) as it rotates.

[0054] The flap (37) is configured so that the inclination angle can be changed stepwise. In this example, the positions to which the flap (37) can be adjusted include six positions. These six positions include a closed position and five open positions. The five open positions include the substantially horizontal blowing position shown in FIG. 3. In the closed position, the flap (37) substantially closes the indoor air outlet (31b). A gap may be formed between the flap (37) in the closed position and the indoor air outlet (31b).

[0055] (2-3) Remote Controller As shown in FIGS. 2 and 4, the air conditioner (1) includes a remote controller (40). The remote controller (40) is placed in a position indoors where the user can operate it. The remote controller (40) has a display unit (41) and an input unit (42). The display unit (41) displays predetermined information. The display unit (41) is configured, for example, by a liquid crystal monitor. The predetermined information is information indicating the operating state and set temperature of the air conditioner (1). The input unit (42) accepts input operations for making various settings from the user. The input unit (42) is configured, for example, by a plurality of physical switches. The user can set the operating mode, target temperature, target humidity, and the like of the air conditioner (1) by operating the input unit (42) of the remote controller (40).

[0056] (2-4) Sensor 2 and 4, the air conditioner (1) has a plurality of sensors. The plurality of sensors includes a sensor for the refrigerant and a sensor for the air. The refrigerant sensors include a sensor for detecting the temperature and pressure of a high-pressure refrigerant and a sensor for detecting the temperature and pressure of a low-pressure refrigerant (not shown).

[0057] The air sensors include an outdoor air temperature sensor (51), an indoor air temperature sensor (53), and an indoor air humidity sensor (54). The outdoor air temperature sensor (51) is provided in the air conditioner outdoor unit (10). The outdoor air temperature sensor (51) detects the temperature of outdoor air. The indoor air temperature sensor (53) and the indoor air humidity sensor (54) are provided in the air conditioner indoor unit (30). The indoor air temperature sensor (53) detects the temperature of indoor air. The indoor air humidity sensor (54) detects the humidity of indoor air. The indoor air humidity sensor (54) detects the relative humidity of indoor air, but may also detect absolute humidity.

[0058] (2-5) Controller As shown in Figs. 2 and 4, the air conditioner (1) has a controller (C). The controller (C) controls the operation of the refrigerant circuit (R). The controller (C) controls the operation of the air conditioning outdoor unit (10), the humidity control unit (20), and the air conditioning indoor unit (30). The controller (C) includes an outdoor control unit (OC), an indoor control unit (IC), and a remote controller (40). The outdoor control unit (OC) is provided in the air conditioning outdoor unit (10). The indoor control unit (IC) is provided in the air conditioning indoor unit (30). Each of the indoor control unit (IC) and the outdoor control unit (OC) 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.

[0059] The outdoor control unit (OC) receives a detection value of the outdoor air temperature sensor (51).

[0060] The outdoor control unit (OC) is connected to the compressor (12), the outdoor fan (13), the expansion valve (15), and the four-way switching valve (16). The outdoor control unit (OC) outputs control signals for starting and stopping the operation of the air conditioning outdoor unit (10) to the compressor (12), the outdoor fan (13), the expansion valve (15), and the four-way switching valve (16). The outdoor control unit (OC) controls the rotation speed of the first motor (M1) of the compressor (12), the rotation speed of the second motor (M2) of the outdoor fan (13), the state of the four-way switching valve (16), and the opening degree of the expansion valve (15).

[0061] The indoor control unit (IC) receives a detection value of the indoor air temperature sensor (53) and a detection value of the indoor air humidity sensor (54).

[0062] The indoor control unit (IC) is connected to the remote controller (40) so as to be able to communicate with the indoor control unit (IC). The indoor control unit (IC) is connected to the indoor fan (32). The indoor control unit (IC) outputs a control signal for starting and stopping the operation of the air conditioning indoor unit (30) to the indoor fan (32). The indoor control unit (IC) controls the rotation speed of a fifth motor (M5) of the indoor fan (32). The indoor control unit (IC) is connected to the outdoor control unit (OC) so as to be able to communicate with the indoor control unit (OC).

[0063] The remote controller (40) is connected to the indoor control unit (IC) so as to be able to communicate with it. The remote controller (40) transmits an instruction signal to the indoor control unit (IC) instructing the operation of the air conditioner (1) in response to a user's operation on the input unit (42). Upon receiving the instruction signal from the remote controller (40), the indoor control unit (IC) transmits the instruction signal to the outdoor control unit (OC). The indoor control unit (IC) controls the operation of the above-mentioned devices of the air conditioning indoor unit (30) in accordance with the instruction signal. Upon receiving the instruction signal from the indoor control unit (IC), the outdoor control unit (OC) controls the operation of the above-mentioned devices of the air conditioning outdoor unit (10) and the humidity control unit (20).

[0064] (3) Driving behavior The operation modes executed by the air conditioner (1) include cooling operation, heating operation, supply air operation, exhaust operation, dehumidification operation, humidification operation, dehumidification / cooling operation, and heating / humidification operation. The controller (C) executes these operations based on instruction signals from the remote controller (40).

[0065] (3-1) Cooling operation The cooling operation is an operation in which the indoor air is cooled by the indoor heat exchanger (34) functioning as an evaporator. The humidity control unit (20) is stopped. In the cooling operation, the controller (C) operates the compressor (12), the outdoor fan (13), and the indoor fan (32). The controller (C) sets the four-way switching valve (16) to the first state. The controller (C) appropriately adjusts the opening of the expansion valve (15). In the cooling operation, a first refrigeration cycle is performed in which the compressed refrigerant releases heat in the outdoor heat exchanger (14) and evaporates in the indoor heat exchanger (34).

[0066] In the cooling operation, the rotation speed of the compressor (12) is controlled so that the indoor temperature detected by the indoor air temperature sensor (53) converges to a target temperature. The target temperature is a set temperature set by, for example, the remote controller (40). In the cooling operation, air delivered by the indoor fan (32) is cooled as it passes through the indoor heat exchanger (34). The air cooled by the indoor heat exchanger (34) is supplied to the room (I) through the indoor air outlet (31b) of the air conditioner indoor unit (30).

[0067] (3-2) Heating operation The heating operation is an operation in which the indoor air is heated by the indoor heat exchanger (34) functioning as a radiator. The humidity control unit (20) is stopped. In the heating operation, the controller (C) operates the compressor (12), the outdoor fan (13), and the indoor fan (32). The controller (C) sets the four-way switching valve (16) to the second state. The controller (C) appropriately adjusts the opening of the expansion valve (15). In the heating operation, a second refrigeration cycle is performed in which the refrigerant compressed by the compressor (12) releases heat in the indoor heat exchanger (34) and evaporates in the outdoor heat exchanger (14).

[0068] In the heating operation, the rotation speed of the compressor (12) is controlled so that the indoor temperature detected by the indoor air temperature sensor (53) converges to a target temperature. The target temperature is a set temperature set by, for example, the remote controller (40). In the heating operation, air delivered by the indoor fan (32) is heated as it passes through the indoor heat exchanger (34). The air heated in the indoor heat exchanger (34) is supplied to the room (I) through the indoor air outlet (31b) of the air conditioner indoor unit (30).

[0069] (4) Electrical wiring for air conditioning equipment The air conditioner (1) is connected to a commercial power source (E). As shown in Fig. 5, the humidity control unit (20) has a humidity control rotor (22), a first fan (26), a second fan (23), a heater (25), a first switching damper (24), and a second switching damper (29). The air conditioning unit (5) has the above-mentioned compressor (12), outdoor fan (13), expansion valve (15), four-way switching valve (16), outdoor air temperature sensor (51), indoor fan (32), air direction adjustment section (36), indoor air temperature sensor (53), and indoor air humidity sensor (54).

[0070] The air conditioning outdoor unit (10) is provided with a first relay terminal (71) electrically connected to each device on the air conditioning outdoor unit (10) side. The air conditioning indoor unit (30) is provided with a second relay terminal (72) electrically connected to each device on the air conditioning indoor unit (30) side. The first relay terminal (71) and the second relay terminal (72) are connected to each other via a relay electrical wiring (73). The electrical wiring of the air conditioning indoor unit (30) is connected to a commercial power source (E) by, for example, inserting a power plug (74) into an outlet (75) in the room (I). As a result, the humidity control unit (20) and the air conditioning unit (5) are connected to the commercial power source (E) via a breaker (B).

[0071] The breaker (B) is a wiring circuit breaker. The breaker (B) is, for example, an MCCB (Molded Case Circuit Breaker). The breaker (B) electrically cuts off the commercial power source (E) and the electrical equipment, including the air conditioner (1), when the current value from the commercial power source (E) to the electrical equipment exceeds a predetermined value.

[0072] (5) Details of the control of the controller During cooling operation, the controller (C) increases the rotation speed (operating frequency) of the compressor (12) when the indoor temperature is significantly higher than the target temperature, and decreases the rotation speed of the compressor (12) when the indoor temperature approaches the target temperature. During heating operation, the controller (C) increases the rotation speed of the compressor (12) when the indoor temperature is significantly lower than the target temperature, and decreases the rotation speed of the compressor (12) when the indoor temperature approaches the target temperature. When the rotation speed of the compressor (12) is high, the power consumption of the compressor (12) is high. Since the proportion of the power consumption of the compressor (12) in the total power consumption of the air conditioner (1) is significantly large, the power consumption of the compressor (12) has a large impact on the total power consumption of the air conditioner (1). In order to reduce power consumption, the controller (C) sets a maximum upper limit of power consumption based on the rated current of the compressor (12) and controls the compressor (12) so that the power consumption does not exceed the maximum upper limit when the rotation speed of the compressor (12) is high. If this maximum upper limit is too low, the air conditioner (1) cannot fully demonstrate its air conditioning performance, and it takes a long time for the indoor temperature to approach the target temperature. On the other hand, even if the maximum upper limit is appropriately set, if the indoor temperature remains close to the target temperature for a long period of time, the power consumption will hardly reach the maximum upper limit, and sufficient energy saving effects will not be obtained.

[0073] In order to solve such a problem, the controller (C) causes the air conditioner (1) to operate in an energy saving mode in which the rotation speed of the compressor (12) is reduced when the difference between the room temperature and the target temperature is small. The energy saving mode will be described in detail below. In this embodiment, the energy saving mode corresponds to the first mode.

[0074] (5-1) Overview of energy saving mode The energy saving mode is a control mode for obtaining a sufficient energy saving effect when the room temperature is close to the target temperature and the rotation speed of the compressor (12) is relatively low. C1) continues for a first predetermined time. Specifically, when the difference (ΔT) between the room temperature and the target temperature becomes equal to or lower than the first predetermined value (ΔT C1 When a state where the power consumption is equal to or less than the first predetermined value (ΔT ) continues for a first predetermined time, the controller (C) sets the power consumption at the time when the first predetermined time has elapsed as a reference capacity value. The controller (C) sets a first value lower than the reference capacity value as a set upper limit value. The controller (C) controls the rotation speed of the compressor (12) so that the power consumption is equal to or less than the first value. C1 ) is, for example, 0.5°C. The first predetermined time is, for example, 5 minutes. When the difference (ΔT) between the room temperature and the target temperature is equal to or smaller than the first predetermined value (ΔT C1 ) The following states include a state in which the indoor temperature is higher than the target temperature by a first predetermined value during cooling operation, and a state in which the indoor temperature is lower than the target temperature by a first predetermined value during heating operation. Power consumption is an example of an air conditioning capacity value.

[0075] The controller (C) sets the first value according to the reference ability value. In other words, the first value is a variable value that changes according to the reference ability value. The controller (C) calculates the first value, for example, by multiplying the reference ability value by a coefficient less than 1 (such as 0.8 or 0.9).

[0076] The user can select whether or not to operate the air conditioner (1) in energy saving mode. The remote controller (40) has a selection button for selecting whether or not to execute the energy saving mode. When the selection button is pressed while the energy saving mode is canceled, the controller (C) executes the energy saving mode, and when the selection button is pressed while the energy saving mode is executed, the controller (C) cancels the energy saving mode.

[0077] (5-2) Updating the upper limit When the energy saving mode is being executed, the controller (C) updates the set upper limit value in accordance with the total load (hereinafter referred to as the air conditioning load) of the air conditioner (1) and the indoor temperature. Below, a case where the controller (C) updates the set upper limit value will be described. Note that the air conditioning load is the combined load of the air conditioning outdoor unit (10), the load of the humidity control unit (20), and the load of the air conditioning indoor unit (30). "Updating the set upper limit value" means changing the energy saving condition value to a different value without resetting it.

[0078] When the air conditioning load becomes high, the controller (C) updates the set upper limit value to a second value higher than the first value, and controls the rotation speed of the compressor (12) so that the power consumption is equal to or lower than the second value. (a) During cooling operation, the indoor temperature is higher than the target temperature and the temperature difference is equal to or smaller than a second predetermined value (ΔT C2 ) or more (b) When another heat source occurs in the room (I), such as when a gas stove is turned on during cooling operation. (c) During heating operation, the room temperature is lower than the target temperature and the temperature difference is equal to or smaller than a second predetermined value (ΔT C2 ) or more (d) When air is introduced into the room (I) from outside, for example when a window is opened. (e) When the operation mode is changed from cooling to dehumidifying and cooling (f) When the operation mode is changed from heating to heating and humidification and the like. The second predetermined value is, for example, 2.5° C. When the air conditioning load is high, the power consumption of the air conditioner (1) increases. Therefore, if the set upper limit value is left at the first value, the rotation speed of the compressor (12) needs to be lowered in order to maintain the power consumption at or below the first value. If the rotation speed of the compressor (12) is lowered, the air conditioning performance decreases, and it becomes difficult for the indoor temperature to approach the target temperature. By updating the set upper limit value to the second value when the air conditioning load is high, the rotation speed of the compressor (12) can be maintained or increased, and the air conditioning performance can be fully exhibited.

[0079] When the air conditioning load is low, the controller (C) updates the set upper limit value to a third value lower than the second value, and controls the rotation speed of the compressor (12) so that the power consumption is equal to or lower than the third value. (g) When another heat source occurs in the room (I), such as when a gas stove is turned on during heating operation. (h) When the operation mode is changed from dehumidifying and cooling to cooling (i) When the operation mode is changed from heating / humidification to heating etc. When the air conditioning load is low, even if the compressor (12) is controlled to reduce power consumption, the compressor (12) can be operated at a sufficient rotation speed. When the air conditioning load is low, the controller (C) updates the set upper limit value to the third value, thereby making it possible to enhance energy saving effects while fully exhibiting air conditioning performance. The third value may be higher or lower than the first value as long as it is smaller than the second value. For example, when the set upper limit value is set to the first value and the air conditioning load is low, the controller (C) can set a value lower than the first value as the third value. When the set upper limit value is set to the second value and the air conditioning load is low, the controller (C) can set a value higher than the first value and lower than the second value as the third value.

[0080] The controller (C) detects (a) to (d) and (i) based on the detection result of the inside air temperature sensor (53) and changes the set upper limit value to the second value or the third value. The controller (C) sets the second value and the third value based on the reference capacity value when the first value was set. For example, the controller (C) calculates the second value by multiplying the reference capacity value by a coefficient larger than that used when calculating the first value, and calculates the third value by multiplying the reference capacity value by a coefficient smaller than that used when calculating the second value.

[0081] When the indoor temperature is equal to or lower than the target temperature during cooling operation for a second predetermined time or more, or when the indoor temperature is equal to or higher than the target temperature during heating operation for a second predetermined time or more, the controller (C) updates the set upper limit value to a fourth value lower than the first value. The controller (C) controls the rotation speed of the compressor (12) so that the power consumption is equal to or lower than the fourth value. The second predetermined time is, for example, 20 minutes. The controller (C) sets the fourth value based on the first value. The controller (C) calculates the fourth value by multiplying the first value by a coefficient (for example, 0.8) that is less than 1. When the indoor temperature is equal to or lower than the target temperature for a long time despite the setting of the set upper limit value and the reduction in the rotation speed of the compressor (12), it is highly likely that the compressor (12) is performing at a capacity higher than necessary. In such a situation, the controller (C) sets the set upper limit value to a further lower value, thereby preventing the compressor (12) from operating excessively, and thus improving the energy saving effect.

[0082] The controller (C) may change the first value according to a user's setting. For example, the controller (C) may allow the user to select between "high energy saving" and "low energy saving", and when "high energy saving" is selected, the controller (C) may set the first value to a value smaller than when "low energy saving" is selected. For example, the controller (C) may set the coefficient by which the reference capacity value is multiplied to 0.8 when the user selects "high energy saving", and may set the coefficient by which the reference capacity value is multiplied to 0.9 when the user selects "low energy saving".

[0083] (5-3) Resetting the upper limit The controller (C) may reset the reference capacity value and the set upper limit value and set new first values ​​as the reference capacity value and the set upper limit value during cooling operation and heating operation in the energy saving mode. -Meets thermo-off conditions - The target temperature is reset to a lower temperature during cooling operation. -The target temperature is reset to a higher temperature during heating operation. When any of the three conditions above is met, the base ability score and first value are reset.

[0084] (5-3-1) Thermo off Thermo-off is a control in which the controller (C) stops the air conditioning operation of the air conditioner (1) when the condition (hereinafter referred to as the thermo-off condition) is met that the temperature in the space to be air-conditioned is outside a predetermined allowable temperature range including the set temperature of the air conditioner (1). Specifically, in the case of cooling operation, when the indoor temperature is at the thermo-off temperature (ΔT OFF ) or more below the target temperature, in the case of heating operation, the thermo-off temperature (ΔT OFF ), the controller (C) stops the air conditioning operation of the air conditioner (1). That is, the controller (C) stops the compressor (12) when a predetermined thermo-off condition is satisfied. When the state where the thermo-off condition is satisfied changes to a state where the thermo-off condition is not satisfied, the controller (C) operates the compressor (12) again. The state where the thermo-off condition is not satisfied means a state where the indoor temperature rises or falls and the difference between the indoor temperature and the target temperature falls below the thermo-off temperature.

[0085] The controller (C) resets the reference capacity value and the first value when a predetermined thermo-off condition is satisfied. When the state where the thermo-off condition is satisfied changes to a state where the thermo-off condition is not satisfied, the controller (C) resets the reference capacity value and the first value based on the power consumption after a third predetermined time has elapsed since the state where the thermo-off condition is not satisfied. The controller (C) sets the reset first value as the set upper limit value. The controller (C) controls the rotation speed of the compressor (12) so that the power consumption is equal to or less than the reset first value. The third predetermined time is, for example, five minutes. When the compressor (12) is operated again, the power consumption temporarily increases. Therefore, if the power consumption at the moment the compressor (12) is operated is set as the reference capacity value, there is a risk that the set upper limit value will be set higher than necessary. After the compressor (12) is operated again, the controller (C) waits for the operation of the compressor (12) to stabilize, and then resets the reference capacity value and the first value.

[0086] (5-3-2) Changing the target temperature The controller (C) resets the reference capacity value and the first value when the target temperature is reset to a lower temperature during cooling operation. When the target temperature is reset to a lower temperature during cooling operation, it is necessary to increase the rotation speed of the compressor (12) in order to quickly bring the room temperature closer to the target temperature. Since it is difficult to increase the rotation speed of the compressor (12) when the first value is set, the controller (C) resets the reference capacity value and the first value.

[0087] The controller (C) determines whether the difference (ΔT) between the room temperature and the reset target temperature is equal to or smaller than a first predetermined value (ΔT C1 ) or below continues for a first predetermined time, the power consumption at the time the first predetermined time has elapsed is reset as a new reference capacity value. The controller (C) resets a first value lower than the reset reference capacity value as the set upper limit value. The controller (C) controls the rotation speed of the compressor (12) so that the power consumption becomes equal to or less than the new first value.

[0088] The controller (C) resets the reference capacity value and the first value when the target temperature is reset to a higher temperature during heating operation, similarly to the cooling operation. The controller (C) resets the reference capacity value and the first value when the difference (ΔT) between the room temperature and the reset target temperature is equal to or greater than the first predetermined value (ΔT C1 When the state below continues for a first predetermined time, the reference capacity value and the first value are reset, and the rotation speed of the compressor (12) is controlled so that the power consumption becomes equal to or less than the new first value, as in the cooling operation.

[0089] (5-4) Stopping energy saving mode The controller (C) may interrupt the energy saving mode during cooling or heating operation in the energy saving mode. The controller (C) may During cooling operation, if the room temperature is higher than the target temperature and the temperature difference is less than the third specified value (ΔT C3 ) or more During heating operation, when the room temperature is lower than the target temperature and the temperature difference is equal to or smaller than the third predetermined value (ΔT C3 ) or more During cooling operation, the room temperature is the first specified temperature (T MAX ) or more During heating operation, the room temperature reaches the second specified temperature (T MIN ) or less The power saving mode is interrupted when any of the following four conditions is met:

[0090] When the energy saving mode is interrupted, the controller (C) controls the number of revolutions of the compressor (12) so as to bring the indoor temperature closer to the target temperature. The controller (C) controls the number of revolutions of the compressor (12) so as to bring the indoor temperature closer to the target temperature when the difference (ΔT) between the indoor temperature and the target temperature becomes equal to or smaller than a first predetermined value (ΔT C1 The controller (C) resumes the energy saving mode when the difference (ΔT) between the room temperature and the target temperature becomes equal to or lower than a first predetermined value (ΔT C1 The power consumption at the time when the state below has continued for a first predetermined time is reset as the reference capacity value. The controller (C) resets a first value lower than the reference capacity value as the set upper limit value. The controller (C) controls the rotation speed of the compressor (12) so that the power consumption becomes equal to or lower than the reset first value.

[0091] (5-5) Flowchart for cooling operation 8 to 10 are examples of flowcharts showing the processing operations of the controller (C) when performing cooling operation in the energy saving mode.

[0092] As shown in FIG. 8, during cooling operation in step S101, when the energy saving mode is started in step S102, the process proceeds to step S103. In step S103, the controller calculates the indoor temperature (T) and the target temperature (T a ) is less than or equal to a first predetermined value (ΔT C1 ) has continued for a first predetermined time.

[0093] In step S103, the indoor temperature (T) and the target temperature (T a ) is less than or equal to a first predetermined value (ΔT C1) has continued for a first predetermined time, the process proceeds to step S104 and step S105, where a reference capacity value and a first value based on the reference capacity value are set. Once the first value has been set, the process proceeds to step S106. In step S106, the first value is set as a set upper limit value, and the rotation speed (operating frequency) of the compressor (12) is controlled so that the power consumption of the air conditioner (1) is smaller than the first value.

[0094] In the next step S107, it is determined whether or not there is a command to turn off the energy saving mode. The command to turn off the energy saving mode is transmitted to the controller (C) when the user presses a button on the remote controller (40) to turn off the energy saving mode, or when the user presses a button on the remote controller (40) to turn off the operation of the air conditioner (1) itself. When the command to turn off the energy saving mode is input to the controller (C), the energy saving mode ends in step S108.

[0095] In step S107, if there is no command to turn off the energy saving mode, the process proceeds to steps S109 and S110. In steps S109 and S110, it is determined whether or not the conditions for interrupting the energy saving mode are met. In step S109, the indoor temperature (T) is set to a target temperature (T a ) to the third predetermined value (ΔT C3 In step S110, it is determined whether the indoor temperature (T) is equal to or greater than the first predetermined temperature (T MAX ) or more.

[0096] The indoor temperature (T) is equal to the target temperature (T a ) to the third predetermined value (ΔT C3 ) or higher than the first predetermined temperature (T MAX ), the energy saving mode is interrupted in step S111. After the energy saving mode is interrupted, in step S112, the indoor temperature (T) and the target temperature (T a ) is less than or equal to a first predetermined value (ΔT C1When the condition (a) is satisfied, the process proceeds to step S113, where the energy saving mode is resumed. After the energy saving mode is resumed, the process returns to step S103.

[0097] When the condition for interrupting the energy saving mode is not met, it is determined in steps S114, S117, and S120 whether or not the condition for updating the set upper limit value is met. In step S114, it is determined whether or not the air conditioning load increases. When the air conditioning load increases, the process proceeds to steps S115 and S116 in this order. In this case, a second value higher than the first value is set based on the reference capacity value. The controller (C) updates the set upper limit value to the second value, and controls the rotation speed of the compressor (12) so that the power consumption of the air conditioner (1) is equal to or lower than the second value. In step S117, it is determined whether or not the air conditioning load decreases. When the air conditioning load decreases, the process proceeds to steps S118 and S119 in this order. In this case, a third value lower than the second value is set based on the reference capacity value. The controller (C) updates the set upper limit value to a third value, and controls the rotation speed of the compressor (12) so that the power consumption of the air conditioner (1) becomes equal to or less than the third value.

[0098] When the air conditioning load does not change and the process proceeds to step S120, the indoor temperature (T) is set to the target temperature (T a ) to the thermo-off temperature (ΔT OFF ) lower than the target temperature (T a ) has continued for a second predetermined time. When these conditions are met, the process proceeds to step S121 and then step S122. In this case, a fourth value lower than the first value is set based on the first value. The controller (C) updates the set upper limit value to the fourth value, and controls the rotation speed of the compressor (12) so that the power consumption of the air conditioner (1) is equal to or lower than the fourth value. After step S122, the process returns to step S107.

[0099] When the condition for updating the set upper limit is not met, it is determined in steps S123 and S129 whether the condition for resetting the reference capacity value and the set upper limit is met. In step S123, it is determined whether the thermo-off condition is met, that is, whether the indoor temperature (T) is equal to or smaller than the target temperature (T a ) to the thermo-off temperature (ΔT OFF If the thermo-off condition is satisfied, the controller (C) stops the operation of the compressor (12) in step S124, and resets the reference capacity value and the set upper limit value in step S125. After resetting the reference capacity value and the set upper limit value, the process proceeds to step S126, where it is determined whether the thermo-off condition is no longer satisfied, i.e., whether the indoor temperature (T) is equal to or lower than the target temperature (T a ) to the thermo-off temperature (ΔT OFF ) is subtracted from the thermo-off condition. If the thermo-off condition is no longer satisfied, in step S127, the controller (C) operates the compressor (12) again. When the compressor (12) is operated and the third predetermined time has elapsed, the process returns to step S104.

[0100] If the thermo-off condition is not met and the process proceeds to step S129, the target temperature (T a It is determined whether the target temperature (T a When the target temperature (T a ) is not changed, the process returns to step S107.

[0101] The flowchart shown here is an example, and the order of the steps of turning off the energy saving mode (steps S107, 108), suspending the energy saving mode (steps S109 to S113), updating the set upper limit value (steps S114 to S122), and resetting the set upper limit value (steps S123 to S130) after controlling the rotation speed of the compressor (12) in step S106 is not particularly limited. Furthermore, the controller (C) may process these steps simultaneously.

[0102] (5-6) Flowchart for heating operation 11 to 13 are examples of flowcharts showing the processing operations of the controller (C) when performing heating operation in the energy saving mode.

[0103] As shown in FIG. 8, during cooling operation in step S201, when the energy saving mode is started as in step S202, the process proceeds to step S203. In step S203, the controller calculates the indoor temperature (T) and the target temperature (T a ) is less than or equal to a first predetermined value (ΔT C1 ) has continued for a first predetermined time.

[0104] In step S203, the indoor temperature (T) and the target temperature (T a ) is less than or equal to a first predetermined value (ΔT C1 ) has continued for a first predetermined time, the process proceeds to step S204 and step S205, where a reference capacity value and a first value based on the reference capacity value are set. Once the first value has been set, the process proceeds to step S206. In step S206, the first value is set as a set upper limit value, and the rotation speed of the compressor (12) is controlled so that the power consumption of the air conditioner (1) is smaller than the first value.

[0105] In the next step S207, it is determined whether or not there is a command to turn off the energy saving mode. When a command to turn off the energy saving mode is input to the controller (C), the energy saving mode ends in step S208.

[0106] In step S207, if there is no command to turn off the energy saving mode, the process proceeds to steps S209 and S210. In steps S209 and S210, it is determined whether or not the conditions for interrupting the energy saving mode are met. In step S209, the indoor temperature (T) is set to a target temperature (T a ) to the third predetermined value (ΔT C3 In step S210, it is determined whether the room temperature (T) is equal to or lower than the value obtained by subtracting the second predetermined temperature (T MIN ) or less.

[0107] The indoor temperature (T) is equal to the target temperature (T a ) to the third predetermined value (ΔT C3 ) minus the second predetermined temperature (T MIN ), the energy saving mode is interrupted in step S211. After the energy saving mode is interrupted, the indoor temperature (T) and the target temperature (T a ) is less than or equal to a first predetermined value (ΔT C1 When the condition (a) is satisfied, the process proceeds to step S213, where the energy saving mode is resumed. After the energy saving mode is resumed, the process returns to step S203.

[0108] When the condition for interrupting the energy saving mode is not met, in steps S214, S217, and S220, it is determined whether or not the upper limit for updating the set upper limit value is met. In step S214, it is determined whether or not the air conditioning load is increasing. When the air conditioning load is increasing, the process proceeds to steps S215 and S216 in this order. In this case, a second value higher than the first value is set based on the reference capacity value. The controller (C) updates the set upper limit value to the second value, and controls the rotation speed of the compressor (12) so that the power consumption of the air conditioner (1) is equal to or less than the second value. In step S217, it is determined whether or not the air conditioning load is decreasing. When the air conditioning load is decreasing, the process proceeds to steps S218 and S219 in this order. In this case, a third value lower than the second value is set based on the reference capacity value. The controller (C) updates the set upper limit value to a third value, and controls the rotation speed of the compressor (12) so that the power consumption of the air conditioner (1) becomes equal to or less than the third value.

[0109] When the air conditioning load does not change and the process proceeds to step S220, the indoor temperature (T) is set to the target temperature (T a ) to the thermo-off temperature (ΔT OFF ) higher than the target temperature (T a ) has continued for a second predetermined time. When these conditions are met, the process proceeds to step S221 and then step S222. In this case, a fourth value lower than the first value is set based on the first value. The controller (C) updates the set upper limit value to the fourth value, and controls the rotation speed of the compressor (12) so that the power consumption of the air conditioner (1) is equal to or lower than the fourth value. After step S222, the process returns to step S207.

[0110] When the condition for updating the set upper limit is not met, in steps S223 and S229, it is determined whether the condition for resetting the reference capacity value and the set upper limit is met. In step S123, it is determined whether the thermo-off condition is met, that is, whether the indoor temperature (T) is equal to or smaller than the target temperature (T a ) to the thermo-off temperature (ΔT OFF) or more. If the thermo-off condition is satisfied, the controller (C) stops the operation of the compressor (12) in step S224, and resets the reference capacity value and the set upper limit value in step S225. After resetting the reference capacity value and the set upper limit value, the process proceeds to step S226, where it is determined whether the thermo-off condition is no longer satisfied, i.e., whether the indoor temperature (T) is equal to or greater than the target temperature (T a ) to the thermo-off temperature (ΔT OFF ) is added to the thermo-off condition. If the thermo-off condition is not satisfied, the controller (C) operates the compressor (12) again in step S227. When the compressor (12) is operated and the third predetermined time has elapsed, the process returns to step S204.

[0111] If the thermo-off condition is not met and the process proceeds to step S229, the target temperature (T a It is determined whether the target temperature (T a When the target temperature (T) is changed, in step S230, the controller (C) resets the reference capacity value and the set upper limit value. After resetting the reference capacity value and the set upper limit value, the process returns to step S203. a ) is not changed, the process returns to step S207.

[0112] The flowchart shown here is an example, and the order of the steps of turning off the energy saving mode (steps S207, S208), suspending the energy saving mode (steps S209 to S213), updating the set upper limit value (steps S214 to S222), and resetting the set upper limit value (steps S223 to S230) after controlling the rotation speed of the compressor (12) in step S206 is not particularly limited. Furthermore, the controller (C) may process these steps simultaneously.

[0113] (5-7) Time chart 12 and 13 are examples of time charts when a cooling operation is performed in the energy saving mode.

[0114] In the example shown in Fig. 12, after the air conditioner (1) starts operating, at time t1, the difference between the room temperature and the target temperature becomes equal to or less than a first predetermined value, and continues to be the same until time t2, which is the first predetermined time later. The controller (C) sets the power consumption at time t2 as a reference capacity value, and sets a first value that is lower than the reference capacity value. The controller (C) controls the rotation speed of the compressor (12) so that the power consumption becomes equal to or less than the first value.

[0115] After time t2, the indoor temperature rises, and at time t3, when the indoor temperature is higher than the target temperature by at least a second predetermined value, the air conditioning load becomes high, and so the controller (C) calculates the second value based on the reference capacity value. The controller (C) controls the rotation speed of the compressor (12) so that the power consumption becomes equal to or less than the second value. If the indoor temperature continues to rise and the air conditioning load becomes high even after the set upper limit value is updated to the second value, at time t4, the controller (C) updates the second value to a larger value. The controller (C) controls the rotation speed of the compressor (12) so that the power consumption becomes equal to or less than the updated second value.

[0116] If the room temperature continues to rise after time t4, and at time t5 becomes higher than the target temperature by the third predetermined value or more, the controller (C) suspends the energy saving mode and increases the rotation speed of the compressor (12).

[0117] When the difference between the room temperature and the target temperature becomes equal to or less than the first predetermined value at time t6 after the energy saving mode is interrupted, the energy saving mode is resumed. At time t7, when the state in which the difference between the room temperature and the target temperature remains equal to or less than the first predetermined value for a first predetermined time, the controller (C) sets the power consumption at time t7 as a new reference capacity value. The controller (C) sets a new first value based on the new reference capacity value, and controls the rotation speed of the compressor (12) so that the power consumption becomes equal to or less than the first value.

[0118] If the indoor temperature rises and becomes higher than the target temperature by a second predetermined value or more, and the set upper limit value is updated to the second value, and then the indoor temperature falls without becoming higher than the target temperature by a third predetermined value or more, the controller (C) calculates a third value based on the reference capacity value. The controller (C) updates the set upper limit value to the third value, and controls the rotation speed of the compressor (12) so that the power consumption becomes equal to or less than the updated third value.

[0119] In the example shown in Fig. 13, after the air conditioner (1) starts operating, at time tA, the difference between the room temperature and the target temperature becomes equal to or less than a first predetermined value, and continues to be the same until time tB, which is the first predetermined time later. The controller (C) sets the power consumption at time t2 as a reference capacity value, and sets a first value that is lower than the reference capacity value. The controller (C) controls the rotation speed of the compressor (12) so that the power consumption becomes equal to or less than the first value.

[0120] If the indoor temperature continues to decrease after time tB, and at time tC, the indoor temperature remains between the target temperature and a temperature lower than the target temperature by the thermo-off temperature for a second predetermined time, the controller (C) sets a fourth value lower than the first value based on the first value. The controller (C) controls the rotation speed of the compressor (12) so that the power consumption is equal to or less than the fourth value.

[0121] After time tC, at time tD, the indoor temperature becomes the thermo-off temperature (ΔT OFF ), the controller (C) stops the compressor (12) and resets the reference capacity value and the set upper limit value (here, the fourth value).

[0122] At time tE, the difference between the room temperature and the target temperature becomes the thermo-off temperature (ΔT OFF ), the controller (C) operates the compressor (12) again. The controller (C) sets the power consumption at time tF, which is a third predetermined time after the compressor (12) is operated, as the reference capacity value again. The controller (C) sets a new first value based on the new reference capacity value, and controls the rotation speed of the compressor (12) so that the power consumption becomes equal to or less than the first value.

[0123] After time tF, at time tG, when the target temperature is set to a lower temperature, the controller (C) resets the reference capacity value and the set upper limit value (here, the first value). After the reset, at time tH, when the difference between the room temperature and the target temperature becomes equal to or less than the first predetermined value and continues until time tI, which is the first predetermined time later, the controller (C) resets the power consumption at time tI as the reference capacity value. The controller (C) sets a new first value based on the reference capacity value, and controls the rotation speed of the compressor (12) so that the power consumption becomes equal to or less than the first value.

[0124] (6) Variations The above embodiment may be modified as follows.

[0125] The controller (C) detects whether the difference between the room temperature and the target temperature is equal to or smaller than a first predetermined value (ΔT C1 As the condition for "the temperature difference between the reference capacity value and the first value being equal to or less than the first predetermined time," a condition that a certain time has elapsed since the start of cooling or heating operation may be adopted. In this case, the controller (C) may set the reference capacity value and the first value when the certain time has elapsed, without waiting for the passage of the first predetermined time.

[0126] The air conditioning capacity value may be the load of the air conditioning outdoor unit (10) instead of the total power consumption of the air conditioner (1). In this case, the controller (C) determines whether the difference between the indoor temperature and the target temperature is equal to or smaller than a first predetermined value (ΔT C1 ) is satisfied, the load of the air conditioning outdoor unit (10) is set as a reference capacity value. The controller (C) controls the rotation speed of the compressor (12) so that the load of the air conditioning outdoor unit (10) is equal to or less than a first value set based on the reference capacity value. If the load of the air conditioning outdoor unit (10) is reduced, the overall power consumption of the air conditioner (1) is reduced, and therefore, energy saving effects can be sufficiently obtained.

[0127] When calculating the first value, the controller (C) may calculate the first value by subtracting a fixed number from the reference ability value.

[0128] The controller (C) may store in advance a table for setting the first value according to the reference ability value, and may set the first value by reading the table. In this case, the controller (C) may also set the second value, the third value, and the fourth value based on the prestored table.

[0129] (7) Other embodiments 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, modifications, and other embodiments may be appropriately combined or substituted as long as the functions of the subject of the present disclosure are not impaired.

[0130] The air conditioner (1) may be an air conditioner capable of only one of cooling operation or heating operation.

[0131] The air conditioning unit (5) has a heat pump type refrigerant circuit, but may be any type capable of heating air. For example, the air conditioning unit (5) may heat air using a heater or a radiant panel.

[0132] The descriptions "first," "second," "third," etc. mentioned above are used to distinguish the words to which these descriptions are attached, and do not limit the number or order of the words. [Industrial Applicability]

[0133] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for air conditioning apparatuses. [Explanation of symbols]

[0134] 1. Air conditioning equipment 12 Compressor C Controller

Claims

1. An air conditioning apparatus capable of at least one of cooling operation and heating operation, A compressor (12); a controller (C) for controlling the compressor (12); Equipped with the controller (C) is capable of executing a first mode in which the rotation speed of the compressor (12) is controlled so that the air conditioning capacity value is equal to or lower than an upper limit value; The first mode is An air conditioning capacity value in a state where a condition is established in which the difference between the indoor temperature and the target temperature is equal to or less than a first predetermined value is set as a reference capacity value; a first value lower than the reference capability value is set as the upper limit value; the controller (C), in the first mode, when an air conditioning load becomes high, changes the upper limit value to a second value higher than the first value, and controls the rotation speed of the compressor (12); The second value is smaller than the reference ability value. Air conditioning units.

2. The air conditioning apparatus according to claim 1, The air conditioner, wherein, when the air conditioning load is low, the controller (C) changes the upper limit value to a third value lower than the second value to control the rotation speed of the compressor (12).

3. The air conditioning apparatus according to claim 1, The controller (C) changes the upper limit value to a fourth value lower than the first value, and controls the rotation speed of the compressor (12), when the indoor temperature remains below the target temperature for a predetermined period of time or more during the cooling operation, or when the indoor temperature remains above the target temperature for a predetermined period of time or more during the heating operation.

4. The air conditioning apparatus according to claim 1, An air conditioning apparatus, wherein the first value is a value that varies depending on a user setting.

5. In the air conditioning apparatus according to any one of claims 1 to 4, The controller (C) when a predetermined thermo-off condition is satisfied, the compressor (12) is stopped, and the reference capacity value and the upper limit value are reset; When the state changes from one in which the thermo-off condition is satisfied to one in which the thermo-off condition is no longer satisfied, the air conditioning apparatus operates the compressor (12), resets the reference capacity value and the first value based on the air conditioning capacity value after the state in which the thermo-off condition is no longer satisfied, and controls the rotation speed of the compressor (12) with the reset first value as the upper limit value.

6. In the air conditioning apparatus according to any one of claims 1 to 4, The controller (C) resetting the reference capacity value and the upper limit value when the target temperature is changed to a lower temperature during the cooling operation or when the target temperature is changed to a higher temperature during the heating operation; The air conditioning apparatus resets the reference capacity value and the first value based on the air conditioning capacity value in a state where a condition is established in which the difference between the indoor temperature and the changed target temperature is equal to or less than the first value, and controls the rotation speed of the compressor (12) with the reset first value as the upper limit value.

7. In the air conditioning apparatus according to any one of claims 1 to 4, The controller (C) interrupts the first mode when, during the cooling operation, the indoor temperature becomes higher than the target temperature by a second predetermined value greater than the first predetermined value, or when, during the heating operation, the indoor temperature becomes lower than the target temperature by the second predetermined value or more.

8. In the air conditioning apparatus according to any one of claims 1 to 4, The controller (C) interrupts the first mode when the indoor temperature becomes equal to or higher than a first predetermined temperature during the cooling operation, or when the indoor temperature becomes equal to or lower than a second predetermined temperature during the heating operation while the first mode is being executed.

9. In the air conditioning apparatus according to any one of claims 1 to 4, The air conditioning capacity value is the amount of power consumed by the air conditioning device.

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