WO2018207304A1

WO2018207304A1 - Air conditioner

Info

Publication number: WO2018207304A1
Application number: PCT/JP2017/017829
Authority: WO
Inventors: 保幸 ▲高▼井; 千賀田邊
Original assignee: 三菱電機株式会社
Priority date: 2017-05-11
Filing date: 2017-05-11
Publication date: 2018-11-15

Abstract

In a conventional air conditioner, ON/OFF of a heater is controlled on the basis of a difference between a set temperature and a detected indoor temperature if the capacity of a compressor is at least a prescribed capacity, and thus there was a problem where energy was wasted by unnecessarily operating the heater in accordance with a temporary temperature change caused by a disturbance or the like. The present invention starts the operation of the heater if a temperature change rate associated with the passage of time in an air-conditioning space during operation of a compressor is less than a set temperature change rate. This air conditioner uses the temperature change rate in heater control, thereby making it possible to operate the heater in accordance with the heating load state of the air-conditioning space, and to prevent waste of energy due to unnecessary heater operations in response to temporary temperature changes.

Description

Air conditioner

This invention relates to an air conditioner.

Some air conditioners used in buildings such as buildings include a refrigeration cycle apparatus that exchanges heat in an air-conditioned space by operating a compressor, and a heater that assists the heating capacity of the refrigeration cycle apparatus. It was. In this case, the heater is controlled to be turned on / off based on the temperature difference between the set temperature and the detected indoor temperature. In such heater control, the heater is turned on / off regardless of the operating state of the compressor. Therefore, the heater is operated even when the room to be air-conditioned can be sufficiently heated only by the heating capacity of the refrigeration cycle apparatus by the compressor operation, and the heater is operated when heating by the heater is unnecessary. was there.

Therefore, for example, as in the air conditioner described in Patent Document 1, the heater can be operated only when the capacity of the compressor is equal to or greater than a predetermined capacity, and when the capacity of the compressor is equal to or less than the predetermined capacity. By preventing the heater from operating, an air conditioner that suppresses unnecessary heater operation without operating the heater when the room can be sufficiently heated only by the heating capacity of the refrigeration cycle apparatus by operating the compressor. is there.

JP-A-5-256696

However, in the conventional air conditioner, if the capacity of the compressor is equal to or greater than a predetermined capacity, the heater is turned on and off based on the difference between the set temperature and the detected room temperature. If there is a temperature change in the air-conditioned space, for example indoors, due to a temporary disturbance such as a change in the situation, the temperature difference between the set temperature and the detected room temperature reaches the temperature difference at which the heater operates temporarily. Will work. If the change in the indoor environment is temporary due to a disturbance and returns to a stable room temperature promptly, even if the capacity of the compressor exceeds a predetermined capacity, the compressor and the refrigeration cycle apparatus are heated as they are. It is a state in which the room can be stably heated only by its capacity, and it is unnecessary operation to react sensitively to temporary temperature changes as described above, and wasteful energy There was a problem of consumption.

The present invention has been made to solve the above-described problems, and is an air that can suppress unnecessary energy consumption by operating a heater unnecessarily in response to a temporary temperature change due to a disturbance or the like. The object is to obtain a harmony device.

The present invention starts operation of the heater when the temperature change rate with the passage of time of the air-conditioned space while the compressor is operating is smaller than the set temperature change rate.

According to the air conditioner of the present invention, the heater is started based on the temperature change rate with the passage of time of the air-conditioned space, so the heater is turned on according to the heating load situation of the air-conditioned space reflected in the temperature change rate. It can be operated, and if the room is heated only by the heating capacity of the refrigeration cycle device by the operation of the compressor, it is unnecessary to cope with a temporary temperature change even though it can be heated sufficiently It is possible to suppress the wasteful consumption of energy by operating the heater.

The block diagram which shows schematic structure of the air conditioning apparatus in Embodiment 1. FIG. FIG. 2 is a block diagram showing a schematic configuration of a control device in the first embodiment. The flowchart which shows operation | movement of the process part in Embodiment 1. The figure which shows the graph of the indoor temperature in Embodiment 1, and the time change of an air conditioning apparatus The block diagram which shows schematic structure of the air conditioning apparatus in Embodiment 2. FIG. The flowchart which shows operation | movement of the process part in Embodiment 2. The figure which shows the graph of the indoor temperature in Embodiment 2, and the time change of an air conditioning apparatus

Embodiment 1 FIG.
Hereinafter, the air conditioning apparatus of the present invention will be described. FIG. 1 is a configuration diagram showing a schematic configuration of an air-conditioning apparatus according to Embodiment 1 of the present invention. In the present embodiment, an air conditioner 100 that air-conditions a room as an air-conditioned space will be described.

The air conditioner 100 includes an outdoor unit 10 and an indoor unit 20. The air-conditioning apparatus 100 according to Embodiment 1 of the present invention is provided with the refrigeration cycle apparatus 1 that performs heat exchange of the air-conditioned space by operating the compressor 11 inside the outdoor unit 10 and the indoor unit 20. Furthermore, the indoor unit 20 of the air conditioning apparatus 100 is provided with a terminal 4 to which a heater 2 for assisting the heating capacity of the refrigeration cycle apparatus 1 is connected. This heater 2 is based on the temperature change of the conditioned space. Is to drive.

The outdoor unit 10 and the indoor unit 20 are connected via a refrigerant pipe that forms the refrigeration cycle apparatus 1. The heater 2 heats the air-conditioned space, is connected to the terminal 4 connected to the control device 30 of the indoor unit 20, and is operated, that is, drive-controlled by the control device 30. The heater 2 is disposed inside a duct that is connected to the indoor unit 20 and that sends air heated by the indoor unit 20 to the air-conditioned space. In this case, the air further warmed by the heater 2 is sent indoors by the air blower 22. This duct is formed inside the wall or ceiling. As described above, in addition to the case of being provided outside the indoor unit 20, the air conditioner 100 may be provided apart from the indoor unit 20 or may be attached inside the indoor unit 20. For example, the heater 2 may be a panel heater installed on a wall or floor in an air-conditioned space and connected by a signal line that transmits a control signal from the air conditioner 100. Moreover, when attaching to the inside of the indoor unit 20, the indoor unit 20 is provided with a space for attaching the heater 2 therein, and the heater 2 is attached to the air blow destination of the blower 22. In addition, as the heater 2, you may connect a hot water type floor heating apparatus and a gas heater other than an electric heater.

The outdoor unit 10 includes a compressor 11, an outdoor heat exchanger 12, an expansion valve 13, and a four-way valve 14. The compressor 11 compresses the sucked low-pressure refrigerant and discharges it as a high-pressure refrigerant. The outdoor heat exchanger 12 is a heat exchanger that functions as a condenser during cooling operation and functions as an evaporator during heating operation. The expansion valve 13 depressurizes the high-pressure refrigerant into a low-pressure refrigerant. As the expansion valve 13, for example, an electromagnetic expansion valve whose opening degree can be adjusted is used. The four-way valve 14 switches the flow direction of the refrigerant flowing in the refrigerant flow path between the cooling operation and the heating operation. Here, the cooling operation is an operation for supplying a low-temperature and low-pressure refrigerant to the indoor heat exchanger 21, and the heating operation is an operation for supplying a high-temperature and high-pressure refrigerant to the indoor heat exchanger 21. .

The indoor unit 20 is installed indoors, and includes an indoor heat exchanger 21, a blower 22, and a temperature detection unit 23.
The indoor heat exchanger 21 is a heat exchanger that functions as an evaporator during cooling operation and functions as a condenser during heating operation. The blower 22 is disposed to face the indoor heat exchanger 21 and blows air to the indoor heat exchanger 21. In the indoor heat exchanger 21, heat exchange is performed between the refrigerant circulating in the refrigerant circuit and the indoor air blown by the blower 22. The temperature detection part 23 detects the temperature of the room as an air-conditioned space, and detects the temperature of the room using a thermistor or the like.

As shown in FIG. 1, the indoor heat exchanger 21 of the indoor unit 20 and the expansion valve 13 and the four-way valve 14 of the outdoor unit 10 are connected by a refrigerant pipe through which the refrigerant flows. As described above, the compressor 11, the outdoor heat exchanger 12, the expansion valve 13, and the indoor heat exchanger 21 are connected by the refrigerant pipe, so that the heat absorption due to the evaporation of the refrigerant and the heat dissipation due to the condensation are used. A refrigeration cycle apparatus 1 is configured.

A control device 30 for controlling the operation of the air conditioner 100 is provided inside the indoor unit 20, and a remote controller 3 is connected to the indoor unit 20.
The remote controller 3 receives an operation by the user and transmits an operation signal based on the operation to the control device 30. The remote controller 3 includes a display unit that displays an operating state of the air conditioning apparatus 100 and an operation unit that receives an operation by a user. The remote controller 3 and the indoor unit 20 need only be able to transmit a signal indicating the operating state of the air conditioner 100 or an operation signal based on the operation, and may be electrically connected by a communication line or connected by wireless communication. is there.

Next, the configuration of the control device 30 will be described based on FIG. FIG. 2 is a block diagram illustrating a schematic configuration of the control device 30.
The control device 30 is configured by, for example, a hardware circuit such as a substrate and an integrated circuit, and is provided inside the indoor unit 20. The control device 30 operates the air conditioner 100 based on an operation signal transmitted from the remote controller 3.
The control device 30 includes a processing unit 31, a compressor driving unit 32, a blower driving unit 33, a heater driving unit 34, a timer 35, and a storage unit 36.

The processing unit 31 includes a compressor control unit 37 that determines the operations of the compressor 11, the blower 22, and the heater 2, a blower control unit 38, and a heater control unit 39, and is a CPU (Central Processing Unit) or DSP (Digital). (Signal Processor) and software executed by the CPU or DSP. The processing unit 31 is connected to the remote controller 3 and the temperature detection unit 23, and determines the operation of the air conditioner 100 based on the operation signal from the remote control 3 and the information on the indoor temperature detected by the temperature detection unit 23. An instruction is given to each drive unit based on the performed operation.

In addition, a timer 35, a storage unit 36, a compressor drive unit 32, a blower drive unit 33, and a heater drive unit 34 are connected to the processing unit 31.
The timer 35 counts elapsed time.
The storage unit 36 accumulates and stores the temperatures detected by the temperature detection unit 23 at regular time intervals. The fixed time for the temperature detection unit 23 to detect the temperature is, for example, 1 minute, which is a preset time. The storage unit 36 also includes a time interval for the processing unit 31 to calculate the indoor temperature change rate ΔTa, which is a rate of change of the temperature detected by the temperature detection unit 23, and a reference value that is a reference value for the indoor temperature change rate ΔTa. The temperature change rate ΔTastd is stored. As a time interval for calculating the indoor temperature change rate ΔTa, a reference compressor operation time Tistdc that is a time for continuously operating the compressor 11 is stored.
The indoor temperature change rate calculated based on the temperature difference of the temperature detected by the temperature detection unit 23 in the reference compressor operation time Tistdc is the compressor indoor temperature change rate ΔTac, and is the time during which the compressor 11 is operating. The indoor temperature change rate ΔTa. That is, the temperature difference between the room temperature detected while the compressor 11 starts operation and the room temperature detected at a time before the reference compressor operation time Tistdc from the time when the room temperature was detected. Is the rate of change in temperature, calculated by dividing by the reference compressor operating time Tistdc.
As a reference temperature change rate ΔTastdc, which is a reference value of the indoor temperature change rate ΔTa, a reference compressor indoor temperature change rate ΔTastdc as a reference value for the compressor indoor temperature change rate ΔTac is stored. The compressor reference indoor temperature change rate ΔTastdc is a positive value.

The storage unit 36 includes a compressor operation start temperature Tcon, which is a temperature at which the compressor 11 starts operating, and a temperature at which the compressor 11 stops operating, as reference temperatures for controlling the operation of the compressor 11. A certain compressor operation stop temperature Tcoff is stored, and as a reference temperature for controlling the operation of the heater 2, a heater operation start temperature Thon that is a temperature at which the heater 2 starts operation, and the heater 2 stops operation. A heater operation stop temperature Toff which is a temperature is stored. Each reference temperature is set from a low temperature to a high temperature in the order of the heater operation start temperature Thon, the compressor operation start temperature Tcon, the heater operation stop temperature Toff, and the compressor operation stop temperature Toff. In addition, each temperature can be appropriately stored in the storage unit 36 by appropriately setting the temperature according to the installation location and usage situation of the air conditioner.

The processing unit 31 determines the operations of the compressor 11, the blower 22, and the heater 2 based on the time counted by the timer 35 and the temperature detected by the temperature detection unit 23. More specifically, when the compressor control unit 37 determines the operation of the compressor 11 and sends a control signal for performing the determined operation of the compressor 11 to the compressor drive unit 32, the compression is performed based on the control signal. The machine drive unit 32 operates the compressor 11.
When the blower control unit 38 determines the operation of the blower 22 and sends a control signal for performing the determined operation of the blower 22 to the blower drive unit 33, the blower drive unit 33 operates the blower 22 based on the control signal. To do.
Furthermore, when the heater control unit 39 determines the operation of the heater 2 and sends a control signal for performing the determined operation of the heater 2 to the heater drive unit 34, the heater drive unit 34 operates the heater 2 based on the control signal. To do.

When the change rate of the temperature detected by the temperature detection unit 23 with the passage of time during the operation of the compressor 11 is smaller than the set change rate of the temperature, the heater control unit 39 Start driving. That is, the heater control unit 39 starts the operation of the heater 2 when the indoor temperature change rate ΔTa during the operation of the compressor 11 is smaller than the reference temperature change rate ΔTastd.

Next, operation | movement of the air conditioning apparatus 100 is demonstrated.
First, an operation signal that causes the user to start the operation of the air conditioner 100 by operating the remote controller 3 is transmitted to the processing unit 31. The processing unit 31 operates the air conditioner 100 based on the time counted by the timer 35 and the temperature detected by the temperature detection unit 23. In the present embodiment, control of the heater 2 in the heating operation will be described.
When the air conditioner 100 starts the heating operation, the timer 35 starts counting. As described above, the temperature detection unit 23 detects the indoor temperature at regular intervals stored in the storage unit 36 based on the count of the timer 35.
In the case of heating operation, the four-way valve 14 is set in the direction shown in FIG. 1, and when the heating operation is started and the compressor 11 is driven, the refrigerant circulates inside the refrigeration cycle apparatus 1, thereby the outdoor heat exchanger. 12, heat exchange between the outdoor air and the refrigerant is performed, and heat exchange between the indoor air and the refrigerant is performed in the indoor heat exchanger 21. Since the high-temperature air heat-exchanged by the indoor heat exchanger 21 is blown toward the room by the blower 22, the room is heated.

While the compressor 11 is in operation, the heater control unit 39 calculates the compressor indoor temperature change rate ΔTac calculated based on the temperature difference detected by the temperature detection unit 23 during the reference compressor operation time Tistdc. When the indoor temperature change rate ΔTastdc for the reference compressor is smaller than the value, the operation of the heater 2 is started.

Since the heater 2 is mounted at a position where the blower 22 is blown, when the heater 2 is started, air blown into the room by the blower 22 is warmed by the heater 2 and blown into the room. .

Next, control of the processing unit 31 during the heating operation of the air-conditioning apparatus 100 will be described with reference to FIGS. FIG. 3 is a flowchart showing the operation of the processing unit 31. FIG. 4 is a view showing a graph of the indoor temperature and the time change of the air conditioner 100. 4A is a time change of the indoor temperature, FIG. 4B is a time change of the operation of the compressor 11, FIG. 4C is a time change of the operation of the heater 2, and FIG. FIG. 4 (e) shows the time change of the compressor indoor temperature change rate ΔTac. The compressor 11 and the heater 2 indicate a state where the compressor 11 and the heater 2 are operating when they are ON and a state where they are stopped when they are OFF.

When an operation to start the heating operation is performed, first, in step S101, the compressor control unit 37 turns off the compressor 11 and the operation is stopped. Since the compressor 11 and the heater 2 are stopped before the heating operation is started, the heating operation is started with both the compressor 11 and the heater 2 stopped.
When the operation of the compressor 11 is turned off in step S101, the process proceeds to step S102 and the compressor control unit 37 resets the compressor operation time Tic. The compressor control unit 37 determines the operation of the compressor 11 by counting the compressor operation time Tic with reference to the time counted by the timer 35.

When the compressor operation time Tic is reset in step S102, the process proceeds to step S103, and the compressor control unit 37 determines whether the room temperature Ta is lower than the compressor operation start temperature Tcon of the compressor 11, that is, whether Ta <Tcon. Judging.

When the room temperature Ta is not lower than the compressor operation start temperature Tcon of the compressor 11 in step 103, the process returns to step S101 and the compressor 11 and the heater 2 are kept stopped.
If the room temperature Ta is lower than the compressor operation start temperature Tcon of the compressor 11 in step 103, it is necessary to heat the room, so that the process proceeds to step S104, where the compressor control unit 37 turns on the compressor 11 and operates. Start. In Step S104, since the room is heated only by the heating capacity of the refrigeration cycle apparatus 1 by the operation of the compressor 11 after the heating operation is started, the operation of the heater 2 is not started.

When the operation of the compressor 11 is started in step S104, the process proceeds to step S105, and the compressor control unit 37 starts counting the compressor operation time Tic from zero. The count of the compressor operation time Tic may be the count immediately before the time when the operation of the compressor 11 is started among the elapsed time counted by the timer 35, or the time when the operation of the compressor 11 is started. It is good also as a count immediately after. Further, at the same time when the operation of the compressor 11 is started, the count of the timer 35 and the count of the compressor operation time Tic may be aligned and started.

When the count of the compressor operation time Tic is started from 0 in step S105, the process proceeds to step S106, and the compressor control unit 37 determines that the indoor temperature Ta is lower than the compressor operation stop temperature Tcoff at which the compressor 11 stops operating. It is determined whether there is, that is, Ta <Tcoff.

When the room temperature Ta is not lower than the compressor operation stop temperature Tcoff at which the compressor 11 stops operating in step S106, it is the case indicated by t1 in FIG. 3, and since the room is sufficiently heated, the process returns to step S101 to perform compression. The machine 11 is turned off and the operation is stopped.

When the room temperature Ta is lower than the compressor operation stop temperature Tcoff at which the compressor 11 stops operating in step S106, the process proceeds to step S107 and the compressor control unit 37 is the time when the compressor operation time Tic is stored in the storage unit 36. It is determined whether the interval is equal to or longer than the reference compressor operation time Tistdc, that is, whether Tic ≧ Tistd.

If the compressor operation time Tic is not equal to or longer than the reference compressor operation time Tistdc in step S107, the process returns to step S106. When the room temperature Ta is lower than the compressor operation stop temperature Tcoff at which the compressor 11 stops operating (Step S106: Yes) by the operation of repeating Step S107 and Step S106, the operation time of the compressor 11 is the reference compressor. The compressor control unit 37 continues the operation of the compressor 11 until the operation time Tistdc is reached.

If the compressor operation time Tic is equal to or longer than the reference compressor operation time Tistdc in step S107, the process proceeds to step S108, and the heater control unit 39 determines whether the room temperature Ta is less than the heater operation start temperature Thon at which the heater 2 starts operation. That is, it is determined whether Ta <Thon.

If the room temperature Ta is not lower than the heater operation start temperature Thon in step S108, the process returns to step S106 and the operations after step S106 are repeated. When returning from step S108 to step S106, the compressor 11 continues operation even after the compressor operation time Tic has elapsed.

If the room temperature Ta is lower than the heater operation start temperature Thon in step S108, the process proceeds to step S109. In step S109, the heater control unit 39 determines the temperature based on the temperature difference detected by the temperature detection unit 23 corresponding to the time interval stored in the storage unit 36 while the compressor 11 is operating. The change rate is calculated, and it is determined whether the calculated change rate is smaller than the reference value of the change rate stored in the storage unit 36. That is, the compressor indoor temperature change rate ΔTac calculated based on the temperature difference detected by the temperature detection unit 23 during the reference compressor operation time Tistdc is the reference compressor indoor temperature change stored in the storage unit 36. It is determined whether ΔTac <ΔTastdc indicating that the rate is less than ΔTastdc.

When the compressor indoor temperature change rate ΔTac is not less than the reference compressor indoor temperature change rate ΔTastdc in step S109, the room can be stably heated only by the heating capacity of the compressor 11 and the refrigeration cycle apparatus 1. Therefore, the operation returns to step S106 without operating the heater 2 and the heating operation of only the compressor 11 is continued.

When the compressor indoor temperature change rate ΔTac is less than the reference compressor indoor temperature change rate ΔTastdc in step S109, this is the case shown in FIG. Since it is insufficient and the room cannot be stably heated, the process proceeds to step S110, and the heater control unit 39 turns on the heater 2 and starts operation.

For example, while the compressor is operating, the heater operation start temperature Thon is 23 ° C., the reference compressor operation time Tistdc is 10 minutes, the reference compressor indoor temperature change rate ΔTastdc is 0.1 ° C./min, the compressor The indoor temperature Ta at the start of operation No. 11 is 20 ° C., and the indoor temperature Ta 10 minutes after the start of operation of the compressor 11 is 22 ° C. The room temperature Ta satisfies 20 ° C. Ta <Thon, but the compressor indoor temperature change rate ΔTac is 0.2 ° C./min, and ΔTac <ΔTastdc is not satisfied. Therefore, the heater control unit 29 operates only the compressor 11 without operating the heater 2. On the other hand, when the indoor temperature Ta at the start of the operation of the compressor 11 is 20 ° C. and the indoor temperature Ta after 10 minutes from the start of the heating operation of the compressor 11 is 19 ° C., the indoor temperature change rate ΔTac for the compressor is Since −0.1 ° C./min and ΔTac <ΔTastdc, the operation of the heater 2 is started.

When the heater 2 starts operation in step S110, the process proceeds to step S111. In step S111, it is determined whether the room temperature Ta is equal to or higher than the heater operation stop temperature Toff, that is, Ta ≧ Toff.

When the room temperature Ta is not equal to or higher than the heater operation stop temperature Toff in step S111, the heater control unit 39 operates the heater 2 until the room temperature Ta becomes equal to or higher than the heater operation stop temperature Toff.

If the room temperature Ta is equal to or higher than the heater operation stop temperature Toff in step S111, it is the case indicated by t4 in FIG. 4, and the process proceeds to step S112 where the heater control unit 39 turns off the heater 2 and stops the operation.

When the operation of the heater 2 is stopped in step S112, the process returns to step S105 and the operations after step S105 are repeated.

As described above, in the air conditioning apparatus 100 of the first embodiment, the heater control unit 39 is more than the temperature change rate at which the temperature change rate with the passage of time of the air-conditioned space during operation of the compressor 11 is set. When it is smaller, the operation of the heater 2 is started. Since the relationship between the heating capacity by the operation of the compressor and the heating load status of the air-conditioned space is reflected in the temperature change rate, the heater control unit 39 operates the heater 2 based on the temperature change rate with the passage of time in the air-conditioned space. By starting the operation, the heater 2 can be operated according to the heating load condition of the air-conditioned space reflected in the rate of temperature change. Therefore, if the room is heated only by the heating capacity of the refrigeration cycle apparatus 1 by the operation of the compressor 11, the heater is operated unnecessarily in response to a temporary temperature change even though the room can be sufficiently heated. And wasteful consumption of energy can be suppressed.
In particular, there are more cases where the room is heated with the heating capacity of the refrigeration cycle apparatus 1 and the heating capacity of the heater 2 than when the room is heated only with the heating capacity of the refrigeration cycle apparatus 1 by the operation of the compressor 11. Since energy is required, it is possible to suppress wasteful consumption of energy without the heater 2 operating unnecessarily.
Further, when the heater control unit 39 calculates the change rate based on the temperature difference between the temperatures detected by the temperature detection unit 23 and the calculated change rate is smaller than the reference value of the change rate stored in the storage unit 36. In order to start the operation of the heater 2, the user does not need to change the operation of the air conditioner 100 or the heater 2 by operating the remote controller 3 according to the heating load condition of the air-conditioned space, and the heater 2 is unnecessary. It is possible to heat the room while suppressing the operation.
In addition, the indoor unit 20 includes a terminal 4 for connecting the heater 2, and the heater control unit 39 controls the heater 2 connected to the terminal 4, so that the heater 2 suitable for the use and installation location of the air conditioner 100 is installed. The user can select and connect.

Embodiment 2. FIG.
In the first embodiment, the heater control unit 39 has been described for the air conditioner 100 that controls one heater 2 connected to the terminal 4, but in the second embodiment, the heater control unit 39 controls a plurality of heaters. The air conditioner 200 will be described.
FIG. 5 is a configuration diagram illustrating a schematic configuration of the air-conditioning apparatus 200 according to Embodiment 2. In FIG. In the second embodiment, the difference from the first embodiment will be mainly described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

The indoor unit 20 of the air-conditioning apparatus 200 according to Embodiment 2 includes a plurality of terminals that respectively connect a plurality of heaters for assisting the heating capacity of the refrigeration cycle apparatus 1. In the second embodiment, a configuration in which the terminals to which a plurality of heaters are connected is composed of two terminals: a terminal 4a that is a first heater terminal and a terminal 4b that is a second heater terminal. A first stage heater 2a is connected to the terminal 4a, and a second stage heater 2b is connected to the terminal 4b.
The heater control unit 39 controls the first stage heater 2a connected to the terminal 4a and the second stage heater 2b connected to the terminal 4b. The heater control unit 39 starts the operation of the first stage heater 2a and operates the first stage heater 2a when the indoor temperature change rate is smaller than the reference value while the compressor 11 is operating. If the indoor temperature change is smaller than the reference value during the operation, the operation of the first stage heater 2a is continued and the operation of the second stage heater 2b is started.

The storage unit 36 includes a time interval at which the processing unit 31 calculates the indoor temperature change rate ΔTa, which is a rate of change of the temperature detected by the temperature detection unit 23, and a reference temperature that is a reference value for the indoor temperature change rate ΔTa. A plurality of change rates ΔTastd are stored.
Specifically, as the first time interval for calculating the rate of change, the reference compressor operating time Tistdc, which is the time for continuously operating the compressor 11, is stored, and as the second time interval for calculating the rate of change. A reference heater operation time Tistdh, which is a time for continuously operating the first stage heater 2a, is stored.
The indoor temperature change rate calculated based on the temperature difference detected by the temperature detector 23 during the reference heater operation time Tistdh is the heater indoor temperature change rate ΔTah, and is the time during which the first stage heater 2a is operating. It is the indoor temperature change rate. That is, the temperature difference between the room temperature detected while the first stage heater 2a is operating and the room temperature detected at the time before the reference heater operation time Tistdh from the time when the room temperature was detected. Is the rate of change of temperature calculated by dividing by the reference heater operating time Tistdh.
Further, the compressor reference indoor temperature change rate ΔTastdc is stored as the first reference value of the indoor temperature change rate ΔTa, and the reference for the heater indoor temperature change rate ΔTah as the second reference value of the indoor temperature change rate ΔTa. A heater reference indoor temperature change rate ΔTastdh is stored as a value. The compressor reference indoor temperature change rate ΔTastdc and the heater reference indoor temperature change rate ΔTastdh are positive values.

Next, operation | movement of the air conditioning apparatus 200 is demonstrated.
While the heating operation is started and the compressor is operating, the operation is the same as that of the first embodiment until the first stage heater 2a starts the operation as described in the first embodiment. When the heater indoor temperature change rate ΔTah is less than the reference heater indoor temperature change rate ΔTastdh while the compressor 11 and the first stage heater 2a are in operation, the heater control unit 39 is connected to the refrigeration cycle apparatus 1 and the first stage. Since the room cannot be stably heated only by the heating capacity of the eye heater 2a, the heater control unit 39 starts the operation of the second stage heater 2b.

Next, the control of the processing unit 31 during the heating operation of the air-conditioning apparatus 200 will be described based on FIGS. FIG. 6 is a flowchart showing the operation of the processing unit 31 according to the second embodiment. FIG. 7 is a diagram showing a graph of the indoor temperature and the time change of the air conditioner 200. FIG. 7A shows the time change of the room temperature, FIG. 7B shows the time change of the operation of the compressor 11, FIG. 7C shows the time change of the operation of the first stage heater 2a, and FIG. FIG. 7E shows the time change of the operation of the stage heater 2b, FIG. 7E shows the time change of the compressor operation time Tic, which is the time during which the compressor 11 is operating, and FIG. 7F shows the operation of the first stage heater 2a. 7 (g) shows the time change of the compressor room temperature change rate ΔTac, and FIG. 7 (h) shows the time change of the heater room temperature change rate ΔTah. .

After the operation to start the heating operation is performed, the operation based on FIG. 3 is performed except the operation of resetting the heater operation time Tih in step S206 until the operation is started by turning on the first stage heater 2a in step S211. The operation is the same as in the first mode.

When the operation of the first stage heater 2a is started in step S211, the process proceeds to step S212, and the heater control unit 39 starts counting the heater operation time Tih. The value for starting the counting of the heater operation time Tih may be the count value immediately before the time when the operation of the first stage heater 2a is started among the elapsed time counted by the timer 35, or the operation of the first stage heater 2a. It is also possible to use a count value immediately after the time when is started. Alternatively, the timer 35 and the heater operation time Tih may be started at the same time when the operation of the first stage heater 2a is started.

When the count of the heater operation time Tih is started in step S212, the process proceeds to step S213, and the heater control unit 39 determines whether the room temperature Ta is lower than the heater operation stop temperature Toff at which the

heaters

2a and 2b stop operating, that is, It is determined whether Ta <Thoff.

If the room temperature Ta is not lower than the heater operation stop temperature Toff at which the

heaters

2a and 2b stop operating in step S213, that is, if the room temperature Ta is equal to or higher than the heater operation stop temperature Toff, for example, the timing shown at t5 in FIG. In this situation, since the room is excessively heated, the heater control unit 39 stops the operation of the first stage heater 2a and returns to step S205 in which it is determined whether or not the operation of the compressor 11 is necessary.

If the room temperature Ta is lower than the heater operation stop temperature Toff at which the

heaters

2a and 2b stop operating in step S213, it is necessary to heat the heater, and the first stage heater 2a is kept until the reference heater operation time Tistdh. In order to perform a process of determining whether or not to drive, the process proceeds to step S214. In step S214, the heater control unit 39 determines whether the heater operation time Tih is equal to or greater than the reference heater operation time Tistdh, which is the time interval stored in the storage unit 36, that is, whether Tih ≧ Tistdh.

If the heater operation time Tih is not equal to or longer than the reference heater operation time Tistdh in step S214, the process returns to step S213. When the room temperature Ta is lower than the heater operation stop temperature Tcofh at which the

heaters

2a and 2b stop operating (Step S214: Yes) by the operation of repeating Step S214 and Step S213, the operation time of the first stage heater 2a is a reference. The heater control unit 39 continues to operate the first stage heater 2a until the heater operation time Tistdh is reached.

When the heater operation time Tih is equal to or longer than the reference heater operation time Tistdh in step S214, the process proceeds to step S215, and the heater control unit 39 determines whether the room temperature Ta is less than the heater operation start temperature Thon at which the

heaters

2a and 2b start operation. That is, it is determined whether Ta <Thon.

If the room temperature Ta is not lower than the heater operation start temperature Thon at which the

heaters

2a and 2b start operation in step S215, the heating capacity is not insufficient in the operation of the first heater 2a, so the process returns to step S213. It returns to the operation | movement flow after step S213 which judges the driving | operation necessity of the eye heater 2a.

In step S215, if the room temperature Ta is lower than the heater operation start temperature Thon at which the

heaters

2a and 2b start to operate, it means that the heater needs to be operated. At this time, in the state where the first stage heater 2a is operating, whether the first stage heater 2a is operated as it is or whether the second stage heater 2b needs to be operated further is determined. In order to perform a process of judging by looking at the rate of increase, the process proceeds to step S216. In step S216, the heater control unit 39 is based on the temperature difference detected by the temperature detection unit 23 corresponding to the time interval stored in the storage unit 36 while the first stage heater 2a is operating. Then, the change rate of the temperature is calculated, and it is determined whether or not the calculated change rate is smaller than the reference value of the change rate stored in the storage unit 36. That is, the heater indoor temperature change rate ΔTah calculated based on the temperature difference detected by the temperature detection unit 23 during the reference heater operation time Tistdh is less than the reference heater indoor temperature change rate ΔTastdh stored in the storage unit 36. It is determined whether ΔTah <ΔTastdh, which indicates that

If the heater indoor temperature change rate ΔTah is not less than the reference heater indoor temperature change rate ΔTastdh in step 216, the room is stabilized by the heating capacity of the compressor 11 and the refrigeration cycle apparatus 1 and the heating capacity of the first stage heater 2a. Therefore, the process returns to the operation flow after step S213 for determining whether or not the first stage heater 2a is required to operate without operating the second stage heater 2b. Therefore, if the operation of the first stage heater 2a is necessary, the heating operation by the compressor 11 and the first stage heater 2a is continued.

Further, when the heater indoor temperature change rate ΔTah is less than the reference heater indoor temperature change rate ΔTastdh in step 216, for example, the timing is shown at t <b> 4 in FIG. 7, and the compressor 11 and the refrigeration cycle apparatus 1 The heating capacity and the heating capacity of the first stage heater 2a are not sufficient for the room temperature to rise, and the room cannot be stably heated. The operation of a different heater, that is, the second stage heater 2b is started. That is, proceeding to step S217, the heater control unit 39 turns on the second stage heater 2b different from the operated first stage heater and starts operation. In step S217, the operation of the first stage heater 2a is continued and the operation of the second stage heater 2b is started. That is, the first stage heater 2a and the second stage heater 2b are operated simultaneously.

When the heater 2 starts operation in step S217, the process proceeds to step S218. In step S218, it is determined whether the room temperature Ta is equal to or higher than the heater operation stop temperature Toff, that is, Ta ≧ Toff.

If the room temperature Ta is not equal to or higher than the heater operation stop temperature Toff in step S218, the heater control unit 39 repeats step S218 until the room temperature Ta becomes equal to or higher than the heater operation stop temperature Toff. Drive 2b.

If the room temperature Ta is equal to or higher than the heater operation stop temperature Toff in step S218, this is the case indicated by t5 in FIG. 7. In step S219, the heater control unit 39 turns off the first stage heater 2a and second stage heater 2b, The operation of these heaters is stopped.

When the operation of the first stage heater 2a and the second stage heater 2b is stopped in step S219, the process returns to step S205 and repeats the operations in and after step S205.

As described above, the air conditioner 200 according to Embodiment 2 includes the two terminals of the terminal 4a that is the first heater terminal and the terminal 4b that is the second heater terminal, and the heater control unit 39 is the first stage. The heater indoor temperature change rate ΔTah is calculated based on the temperature difference of the temperature detected by the temperature detection unit 23 corresponding to the reference heater operation time Tistdh stored in the storage unit 36 while the heater 2a is operating. When the calculated change rate is smaller than the heater reference indoor temperature change rate ΔTastdh stored in the storage unit 36, the second-stage heater 2b different from the operated first-stage heater 2a is turned on to start the operation. .
Therefore, after the first stage heater 2a starts operating, even if the room is heated with the heating capacity of the refrigeration cycle apparatus 1 by the operation of the compressor 11 and the heating capacity of the first stage heater 2a, sufficient heating cannot be performed. In some cases, the heating capability can be changed by starting the operation of the second stage heater 2b.
Further, in order to continue the operation of the first stage heater 2a and start the operation of the second stage heater 2b, in addition to the heating capacity of the refrigeration cycle apparatus 1 by the operation of the compressor 11 and the heating capacity of the first stage heater 2a. In addition, since the room is heated by the heating capacity of the second stage heater 2b, the insufficient heating capacity can be compensated.
In addition, when the heating capacity of the refrigeration cycle apparatus 1 by the operation of the compressor 11 and the heating capacity of the first stage heater 2a are not sufficiently heated, the compressor 11 and the first stage heater 2a Although the operation is continued, the heating capacity of the second stage heater 2b is added so that the room can be sufficiently heated and switched to the operation of the compressor 11 again. Can be wasted.

The first-stage heater 2a and the second-stage heater 2b may use the same output heater or different output heaters. By changing the output of the heater to be used according to the conditioned space in which the air conditioner 200 is used, the heating capacity adapted to the conditioned space in which the air conditioner 200 is installed can be controlled.
Moreover, although the heater control part 39 showed the operation | movement which controls two

heaters

2a and 2b as the air conditioning apparatus 200 which controls a some heater, it may be the structure which controls not only this but three or more heaters. . When controlling three or more heaters, the operation of the first stage heater 2a may be continued, and the operation of a plurality of other heaters may be started, the operation of the first stage heater 2a may be continued, The operation of the heaters may be started in order. Starting the operation of the other heaters sequentially means that the operation of the first stage heater 2a is continued, the operation of the second stage heater 2b is started, and if the heating capacity is required, the first stage heater 2a and In this operation, the operation of the second heater 2b is continued and the operation of other heaters is started.

Embodiment 3 FIG.
In the second embodiment, the heater control unit 39 has described the air conditioner 200 that continues the operation of the first stage heater 2a and starts the operation of the second stage heater 2b. However, in the third embodiment, the heater control unit 39 The unit 39 will explain the air conditioner 300 that stops the operation of the first stage heater 2a and starts the operation of the second stage heater 2c. In the third embodiment, the difference from the second embodiment will be mainly described, and the same parts as those of the second embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

In the air conditioner 300 according to Embodiment 3, the terminals to which the plurality of heaters are connected are the first heater terminal 4a and the heater having a higher output than the heater connected to the first heater terminal. It consists of two terminals of the third heater terminal 4c. The first stage heater 2a is connected to the terminal 4a, and the second stage heater 2c is connected to the terminal 4c. The second stage heater 2c is a heater having a higher output than the first stage heater 2a.

Next, the operation of the air conditioning apparatus 300 will be described. The air conditioner 300 operates in the same manner as the operation of the air conditioner 200 of the second embodiment shown in FIG. 6, but when the second stage heater 2b is turned on in step S217, the first stage heater 2a is turned on. The difference is that it is turned off.
The heater control unit 39 detects the temperature detected by the temperature detection unit 23 corresponding to the reference heater operation time Tistdh stored in the storage unit 36 while the first stage heater 2a is operating in step S217 of FIG. Based on the temperature difference, the heater indoor temperature change rate ΔTah is calculated. When the calculated change rate is smaller than the heater reference indoor temperature change rate ΔTastdh stored in the storage unit 36, the first stage heater 2a is operated. Stop and start operation of the second stage heater 2c. That is, the room is heated by the heating capacity of the refrigeration cycle apparatus 1 by the operation of the compressor 11 and the heating capacity of the second stage heater 2c.

If it is determined in step S218 that the room temperature Ta is not equal to or higher than the heater operation stop temperature Toff, step S218 is repeated, and the heater control unit 39 operates the second stage heater 2c until the room temperature Ta becomes equal to or higher than the heater operation stop temperature Toff.

If the room temperature Ta is equal to or higher than the heater operation stop temperature Toff in step S218, the process proceeds to step S219, and the heater control unit 39 turns off the second stage heater 2c and stops the operation.

When the operation of the second stage heater 2c is stopped in step S219, the process returns to step S203 and repeats the operations after step S203.

As described above, in the air conditioner 300 of the third embodiment, the terminal 4a that is the first heater terminal and the third heater that is connected to the heater that has a higher output than the heater connected to the first heater terminal. The heater control unit 39 corresponds to the reference heater operation time Tistdh stored in the storage unit 36 while operating the first stage heater 2a. When the heater indoor temperature change rate ΔTah is calculated based on the temperature difference detected by the temperature detector 23 and the calculated change rate is smaller than the heater reference indoor temperature change rate ΔTastdh stored in the storage unit 36. Then, the operation of the first stage heater 2a is stopped, and the operation of the second stage heater 2c is started. Therefore, after the first stage heater 2a starts operating, even if the room is heated with the heating capacity of the refrigeration cycle apparatus 1 by the operation of the compressor 11 and the heating capacity of the first stage heater 2a, sufficient heating cannot be performed. In some cases, the second stage heater 2c having a higher output than the first stage heater 2a is switched to heat the room with a heating capacity larger than that of the first stage heater 2a, so that the insufficient heating capacity can be compensated. it can.
Further, when the heater is a panel heater installed on a wall or floor in an air-conditioned space, the first-stage heater 2a and the second-stage heater 2c assist heating in different air-conditioned spaces, so that depending on the condition of the air-conditioning load. By changing the positions where the first stage heater 2a and the second stage heater 2c are arranged, heating suitable for the air-conditioned space can be performed.

Embodiment 4 FIG.
In the third embodiment, the heater control unit 39 has described the air conditioning apparatus 300 that stops the operation of the first stage heater 2a and starts the operation of the second stage heater 2c. However, in the fourth embodiment, the heater control unit 39 After starting the operation of the second stage heater 2b, the unit 39 continues the operation of the second stage heater 2c and starts the operation of the first stage heater 2a when the heating capacity is insufficient. The apparatus will be described. The structure of the air conditioning apparatus of Embodiment 4 is the same as that of the air conditioning apparatus of Embodiment 3. Hereinafter, the difference from the third embodiment will be mainly described, and the same parts as those of the third embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

The storage unit 36 of the air-conditioning apparatus according to Embodiment 4 has a reference heater that is a time for continuously operating the second stage heater 2c using the indoor temperature change rate ΔTa as the third time interval calculated by the processing unit 31. The operation time Tistdh2 is stored. In addition, the storage unit 36 uses the heater reference indoor temperature as a third reference value for the heater indoor temperature change rate ΔTah2 calculated based on the temperature difference detected by the temperature detection unit 23 during the reference heater operation time Tistdh2. The change rate ΔTastdh2 is stored. The heater reference indoor temperature change rate ΔTastdh2 is a positive value.

Next, the operation of the air conditioner of Embodiment 4 will be described. The air conditioner of Embodiment 4 operates in the same manner as the operation of the air conditioner 200 shown in FIG.
When the heater control unit 39 stops the operation of the first stage heater 2a and starts the operation of the second stage heater 2c in step S217 in FIG. 6, the heater operation time Tih starts to be counted. The operation after starting the counting of the heater operation time Tih is the same as the operation after step S213 in FIG. 6 except that the reference heater operation time and the heater reference indoor temperature change rate are different.

While operating the second stage heater 2c, the heater control unit 39 is based on the temperature difference of the temperature detected by the temperature detection unit corresponding to the reference heater operation time Tistdh2 stored in the storage unit 36. The indoor temperature change rate ΔTah2 is calculated, and when the calculated heater indoor temperature change rate ΔTah2 is smaller than the heater reference indoor temperature change rate ΔTastdh2 stored in the storage unit 36, the operation of the second stage heater 2c is continued. At the same time, the operation of the first stage heater 2a is started. That is, the room is heated by the heating capacity of the refrigeration cycle apparatus 1 by the operation of the compressor 11, the heating capacity of the first stage heater 2 a, and the heating capacity of the second stage heater 2 c.

As described above, in the air conditioner according to the fourth embodiment, after the second stage heater 2c starts operating, the heating capacity of the refrigeration cycle apparatus 1 by the operation of the compressor 11 and the heating capacity of the second stage heater 2c are increased. When heating is not possible, heating of the first stage heater 2a is added to operate the compressor 11, the first stage heater 2a, and the second stage heater 2c. Therefore, since the room is heated by the heating capacity of the refrigeration cycle apparatus 1 by the operation of the compressor 11, the heating capacity of the first stage heater 2 c and the heating capacity of the second stage heater 2 c, the refrigeration cycle apparatus 1 by the operation of the compressor 11. The heating capability that is insufficient with the heating capability of the second stage heater 2c can be compensated.

In addition, although the operation | movement which controls two heaters 2a and 2c was shown as an air conditioning apparatus which controls a some heater, not only this but provided the some terminal which each connects three or more heaters, and three or more The structure which controls this heater may be sufficient.

Embodiment 5 FIG.
In the above embodiment, only the operation of the heater control unit 39 has been described. In the fifth embodiment, an air conditioner including a blower control unit 38 that controls the blower 22 while the heater 2 is operating will be described. . In the configuration diagram of the air conditioner of the fifth embodiment, the fifth embodiment will be described with a focus on differences from the above embodiment, and the same parts as those of the above embodiment will be denoted by the same reference numerals. Shall be omitted.

The blower control unit 38 of the air-conditioning apparatus according to Embodiment 5 increases the rotational speed of the blower 22 while the heater control unit 39 is operating the heater 2. That is, the blower control unit 38 increases the rotation speed of the blower 22 when the temperature change rate with the passage of time in the air-conditioned space during the operation of the compressor 11 is smaller than the set temperature change rate.

In the air conditioner of the fifth embodiment, while the heater control unit 39 is operating the heater 2, the air warmed by the heater 2 is blown into the room per unit time by increasing the rotation speed of the blower 22. Since the air volume to be increased can be increased, the room can be heated in a shorter time than the case where the room is heated by the heating capacity of the refrigeration cycle apparatus 1 and the heating capacity of the heater 2 by the operation of the compressor 11. Therefore, it is possible to suppress the wasteful consumption of energy without the heater 2 operating unnecessarily.

In the above embodiment, the heater control unit 39 continues the operation of the first stage heater 2a as the operation of starting the operation of the heater 2 based on the temperature change rate with the passage of time in the air-conditioned space, and the second stage. The operation of starting the operation of the first heater 2b, the operation of stopping the operation of the first stage heater 2a and the operation of starting the operation of the second stage heater 2b, and the operation of the first stage heater 2a while stopping the operation of the second stage heater 2b Although the operation of continuing the operation of the second stage heater 2c after starting the operation and starting the operation of the first stage heater 2a has been described, they may be operated in combination.
The reference temperature stored in the storage unit 36, the time interval at which the processing unit 31 calculates the indoor temperature change rate ΔTa, and the reference temperature change rate ΔTastd, which is the reference value of the indoor temperature change rate ΔTa, are installed in the air conditioner. It can be changed according to the place and use situation, and may be changed by the user from the remote control.
The heater control unit 39 is provided in the indoor unit 20, but may be provided in the remote controller 3.
In addition, the heater 2 is connected to the terminal 4 connected to the control device 30 of the indoor unit 20. However, the heater 2 and the terminal 4 may be configured to be operated, that is, driven and controlled by the control device 30. It is good also as a structure connected by the transmission line which transmits a control signal from the control apparatus 30 to the heater 2, or the structure which attaches the communication apparatus which carries out wireless communication to the terminal 4, and transmits a control signal from the control apparatus 30 to the heater 2 wirelessly. You may connect.

The compressed air conditioner according to the present invention can be widely used as an air conditioner for home use or business use.

1 Refrigeration cycle equipment, 2 heaters, 3 remote controls, 4, 4a, 4b terminals, 10 outdoor units, 11 compressors, 12 outdoor heat exchangers, 13 expansion valves, 14 four-way valves, 20 indoor units, 21 indoor heat exchangers, 22 blower, 23 temperature detection unit, 30 control device, 31 processing unit, 32 compressor drive unit, 33 blower drive unit, 34 heater drive unit, 35 timer, 36 storage unit, 37 compressor control unit, 38 blower control unit, 39 Heater control unit, 100, 200, 300 Air conditioner

Claims

A refrigeration cycle apparatus that performs heat exchange of the air-conditioned space by operating the compressor;
A temperature detector for detecting the temperature in the air-conditioned space;
Operation of the heater that heats the air-conditioned space when the change rate of the temperature detected by the temperature detection unit with the passage of time is smaller than the set change rate of the temperature during the operation of the compressor An air conditioner comprising: a heater control unit that starts the operation.
A storage unit that stores a first time interval for calculating the rate of change and a first reference value for the rate of change;
The heater control unit is configured to change the temperature based on a temperature difference detected by the temperature detection unit corresponding to the first time interval stored in the storage unit while the compressor is operating. 2. The operation of the heater is started when the change rate is calculated and the calculated change rate is smaller than a first reference value of the change rate stored in the storage unit. Air conditioner.
A plurality of terminals for connecting a plurality of heaters, respectively,
The air conditioning apparatus according to claim 2, wherein the heater control unit controls the plurality of heaters connected to the plurality of terminals.
The heater control unit has a rate of change with time of temperature detected by the temperature detection unit while operating some of the plurality of heaters connected to the plurality of terminals. The air conditioner according to claim 3, wherein when the rate of change in temperature stored in the storage unit is smaller than the heater, the operation of the heater different from the heater is started.
The storage unit stores a second time interval for calculating the rate of change, and a second reference value for the rate of change,
While the heater control unit is operating some of the plurality of heaters connected to the plurality of terminals, the heater control unit corresponds to the second time interval stored in the storage unit. The change rate of the temperature is calculated based on the temperature difference between the temperatures detected by the detection unit, and the driving is performed when the calculated change rate is smaller than the second reference value of the change rate stored in the storage unit. The air conditioner according to claim 4, wherein operation of a heater different from the heater is started.
The terminals for connecting the plurality of heaters include a first heater terminal and a second heater terminal,
The heater control unit detects the temperature detected by the temperature detection unit corresponding to the second time interval stored in the storage unit while operating the heater connected to the first heater terminal. The change rate of the temperature is calculated based on the temperature difference between the first heater terminal and the change rate calculated when the calculated change rate is smaller than the second reference value of the change rate stored in the storage unit. The air conditioner according to claim 5, wherein the operation of the heater is continued and the operation of the heater connected to the second heater terminal is started.
The terminals for connecting the plurality of heaters include a first heater terminal and a third heater terminal to which a heater having a higher output than the heater connected to the first heater terminal is connected.
While the heater control unit is operating the heater connected to the first heater terminal, the heater control unit detects the temperature detected by the temperature detection unit corresponding to the second time interval stored in the storage unit. The change rate of the temperature is calculated based on the temperature difference, and the calculated change rate is connected to the first terminal when the calculated change rate is smaller than the second reference value of the change rate stored in the storage unit. 6. The air conditioner according to claim 5, wherein the operation of the heater is stopped and the operation of the heater connected to the third terminal is started.
The storage unit stores a third time interval for calculating the rate of change, and a third reference value for the rate of change,
While the heater control unit is operating the heater connected to the third heater terminal, the heater control unit detects the temperature detected by the temperature detection unit corresponding to the third time interval stored in the storage unit. The temperature change rate is calculated based on the temperature difference. When the calculated change rate is smaller than a third reference value of the change rate stored in the storage unit, the temperature change rate is connected to the third heater terminal. The air conditioner according to claim 7, wherein the operation of the heater is continued and the operation of the heater connected to the one heater terminal is started.
A blower that blows air that has undergone heat exchange in the refrigeration cycle apparatus to the conditioned space;
The air conditioner according to any one of claims 1 to 8, further comprising: a blower control unit that increases a rotational speed of the blower while the heater control unit is operating the heater.