JP6897657B2 - Heat pump device, air conditioner, and hot water unit - Google Patents

Description

The present disclosure relates to heat pump devices, air conditioners, and hot water units.

In a conventional air conditioner, when defrosting an outdoor heat exchanger, if the outdoor temperature detected by the outdoor temperature detector is equal to or higher than a predetermined value, the compressor is stopped and the outdoor fan is rotated to remove the defrost. Some perform frost (see Patent Document 1).

Japanese Patent No. 5363492

In the above air conditioner, when the outdoor fan is rotated with the compressor stopped to defrost the outdoor heat exchanger (hereinafter referred to as "outdoor fan defrosting operation"), the compressor is operated to defrost the outdoor heat. Compared with the case of defrosting the exchanger (hereinafter referred to as "normal defrosting operation"), the time required to complete the defrosting of the outdoor heat exchanger is longer. As a result, when the user needs air conditioning operation, the defrosting of the outdoor heat exchanger may not be completed and the compressor may not be started, which may reduce the comfort of the user.

The present disclosure proposes a heat pump device, an air conditioner, and a hot water unit that can suppress a decrease in user comfort.

The heat pump device of the present disclosure is
A refrigerant circuit including a compressor, a heat exchanger on the user side, an expansion mechanism, and a heat exchanger on the heat source side,
The heat source side fan that supplies air to the heat source side heat exchanger and
It is equipped with the refrigerant circuit and the control device that controls the heat source side fan.
The control device has a determination unit for determining whether or not there is time to perform the defrosting operation by the heat source side fan.
When the outdoor temperature is equal to or higher than the reference temperature and the determination unit determines that there is a time margin, the control device rotates the heat source side fan with the compressor stopped. It is characterized in that the refrigerant circuit and the heat source side fan are controlled so as to perform the defrosting operation.

According to the present disclosure, when the determination unit determines that there is time to rotate the heat source side fan to perform the defrosting operation while the compressor is stopped, the heat application side fan is stopped. Since the defrosting operation is performed by rotating the heat source side heat exchanger, the defrosting of the heat source side heat exchanger can be completed when the user needs to operate the heat pump device. Therefore, when the user needs to operate the heat pump device, the heat pump device can be used at times, so that the deterioration of the user's comfort can be suppressed.

The air conditioner of the present disclosure is
With the above heat pump device
A clock unit that acquires or generates the current time,
It is equipped with a reservation unit for making a reservation to start the operation of the heat pump device at the start time.
The determination unit is characterized in that the operation of the heat pump device is reserved by the reservation unit, and when the difference between the current time and the start time is equal to or longer than a predetermined time, it is determined that there is a time margin. And.

According to the present disclosure, when the start time is set by the reservation unit and the difference between the start time and the current time is more than a predetermined time, the heat source side fan is rotated with the compressor stopped to execute the defrosting operation. Even in this case, the operation of the heat pump device can be started at the start time, assuming that the defrosting of the heat source side heat exchanger has been completed by the start time when the user intends to use the air conditioner. Therefore, it is possible to suppress a decrease in user comfort.

The air conditioner of the present disclosure is
With the above heat pump device
Equipped with an indoor temperature detector that detects the indoor temperature
The determination unit is characterized in that it determines that there is a time margin when the compressor is stopped in the thermo-off state during the air conditioning operation.

According to the present disclosure, in the thermo-off state, the indoor environment is kept comfortable until the next thermo-on, and it is unlikely that the user will be required to operate the air conditioner. Even if the defrosting operation is executed by rotating the fan on the heat request side with the power stopped, if the defrosting of the heat exchanger on the heat source side is completed before the thermo-on, the deterioration of user comfort is suppressed. it can.

The hot water unit of the present disclosure is
With the above heat pump device
Equipped with a clock unit that acquires or generates the current time
The determination unit is characterized in that when the current time acquired or generated by the clock unit is in the night time zone, it is determined that there is a time margin.

According to the present disclosure, during nighttime hours, there is often time to boil hot water using a heat pump device, and the heat source side fan is rotated with the compressor stopped to exchange heat on the heat source side. Even if the container is defrosted, it has little effect on the hot water supply to the user, so that the deterioration of the user's comfort can be suppressed.

The hot water unit of the present disclosure is
With the above heat pump device
It is equipped with a hot water storage tank that stores hot water heated by the user-side heat exchanger and a hot water storage amount detector that detects the amount of hot water stored in the hot water storage tank.
The determination unit is characterized in that when the hot water storage amount detected by the hot water storage amount detection unit is larger than the preset hot water shortage determination hot water storage amount, it is determined that there is a time margin.

According to the present disclosure, since the amount of hot water stored in the hot water storage tank is larger than the amount of hot water stored in the hot water storage tank, even if the heat source side fan is rotated with the compressor stopped to defrost the heat source side heat exchanger, the user Since there is little effect on the hot water supply to the user, it is possible to suppress a decrease in user comfort.

The hot water unit of the present disclosure is
With the above heat pump device
It is equipped with a setting unit for setting the operation schedule of the above heat pump device.
The determination unit is characterized in that when the heat pump device is operated according to the operation schedule set by the setting unit, it is determined that there is a time margin.

According to the present disclosure, when the heat pump device is operated according to the operation schedule set by the setting unit, the operation of the heat pump device is not instructed by the user, so that the heat source side fan is operated with the compressor stopped. Even when the heat exchanger on the heat source side is defrosted by rotating it, the hot water supply to the user is not affected so much, so that the comfort of the user is unlikely to deteriorate.

It is a block diagram of the air conditioner which concerns on 1st Embodiment of this disclosure. It is a control block diagram of the control device which concerns on 1st Embodiment. It is a flowchart of the defrosting operation which concerns on 1st Embodiment. It is a flowchart of the determination process which concerns on 1st Embodiment. It is a flowchart of the determination process which concerns on 2nd Embodiment of this disclosure. It is a block diagram of the hot water unit which concerns on 3rd Embodiment of this disclosure. It is a control block diagram of the control device which concerns on 3rd Embodiment of this disclosure. It is a flowchart of the determination process which concerns on 3rd Embodiment of this disclosure. It is a flowchart of the determination process which concerns on 4th Embodiment of this disclosure. It is a flowchart of the determination process which concerns on 5th Embodiment of this disclosure.

Hereinafter, the heat pump device, the air conditioner, and the hot water unit according to the embodiment of the present disclosure will be described with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 is a configuration diagram of an air conditioner 1 according to the first embodiment of the present disclosure. The air conditioner 1 of the present embodiment is a heat pump type air conditioner to which the heat pump device according to the present disclosure is applied.

Referring to FIG. 1, the air conditioner 1 of the present embodiment includes an outdoor unit 10 and an indoor unit 20 connected to the outdoor unit 10 via a refrigerant pipe.

The outdoor unit 10 includes a compressor 11, an accumulator 12, an outdoor heat exchanger 13, an expansion valve 14, and a four-way switching valve 15.

The compressor 11 has a built-in motor (not shown). When the compressor 11 is driven by the motor, the compressor sucks the refrigerant from the refrigerant pipe on the suction side of the compressor 11, compresses it, and discharges it to the refrigerant pipe on the discharge side of the compressor 11. An accumulator 12 is provided in the refrigerant pipe on the suction side of the compressor 11. Further, the compressor 11 is configured so that the operating frequency can be changed according to the control of the control device 30 (shown in FIG. 2).

The outdoor heat exchanger 13 is a heat exchanger that exchanges heat between the refrigerant flowing through the refrigerant circuit and the outdoor air. The outdoor heat exchanger 13 functions as a condenser during the cooling operation and as an evaporator during the heating operation. The outdoor heat exchanger 13 is an example of the heat source side heat exchanger according to the present disclosure.

The expansion valve 14 decompresses the refrigerant passing through the expansion valve 14 and adjusts the flow rate of the refrigerant passing through the expansion valve 14. The expansion valve 14 is provided in a refrigerant pipe that connects the outdoor heat exchanger 13 and the indoor unit 20. The expansion valve 14 adjusts the flow rate of the refrigerant flowing through the indoor unit 20 by adjusting the opening degree of the expansion valve 14 in the heating operation and the cooling operation. Further, the expansion valve 14 is configured so that the opening degree can be adjusted by the control of the control device 30 (shown in FIG. 2). The expansion valve 14 is an example of the expansion mechanism according to the present disclosure.

The four-way switching valve 15 includes a first port 15a, a second port 15b, a third port 15c, and a fourth port 15d. The first port 15a is connected to the discharge port of the compressor 11, and the second port 15b is connected to the suction port of the compressor 11. Further, the third port 15c is connected to the outdoor heat exchanger 13, and the fourth port 15d is connected to the indoor unit 20. During the heating operation, the four-way switching valve 15 communicates the first port 15a and the fourth port 15d, and communicates the second port 15b and the third port 15c (the solid line switching position in the figure). Also. The four-way switching valve 15 communicates the first port 15a and the third port 15c and communicates the second port 15b and the fourth port 15d during the cooling operation (switching position shown by the broken line in the figure). The four-way switching valve 15 is configured so that the switching position of the solid line in the figure and the switching position of the broken line in the figure can be switched by the control of the control device 30 (shown in FIG. 2).

Further, the outdoor unit 10 includes an outdoor fan 16 that supplies outdoor air to the outdoor heat exchanger 13, an outdoor heat exchanger temperature sensor 17 that detects the temperature of the outdoor heat exchanger 13, and an outdoor unit that detects the temperature of the outdoor air. It further includes an air temperature sensor 18. The outdoor air temperature sensor 18 is an example of the outdoor temperature detection unit according to the present disclosure.

The outdoor fan 16 is configured so that the rotation speed can be changed according to the control of the control device 30 (shown in FIG. 2). The outdoor fan 16 is an example of a heat source side fan according to the present disclosure.

The indoor unit 20 includes an indoor heat exchanger 21, an indoor fan 22 that supplies indoor air to the indoor heat exchanger 21, and an indoor air temperature sensor 23 that detects the temperature of the indoor air. The indoor air temperature sensor 23 is an example of the indoor temperature detection unit.

The indoor heat exchanger 21 is a heat exchanger that exchanges heat between the refrigerant flowing through the refrigerant circuit and the indoor air. The indoor heat exchanger 21 functions as an evaporator during the cooling operation and as a condenser during the heating operation. The indoor heat exchanger 21 is an example of the user-side heat exchanger according to the present disclosure.

A refrigerant circuit is composed of a compressor 11, an accumulator 12, an outdoor heat exchanger 13, an expansion valve 14, a four-way switching valve 15, an indoor heat exchanger 21, and a refrigerant pipe connecting them. ..

The air conditioner 1 of the present embodiment can perform a heating operation, a cooling operation, and a defrosting operation. Hereinafter, the operation of the air conditioner 1 during the heating operation, the cooling operation, and the defrosting operation will be described.

(During heating operation)
When the indoor unit 20 performs the heating operation, the four-way switching valve 15 is switched to the position of the solid line in FIG. 1 and the operation of the compressor 11 is started. Then, the expansion valve 14 is opened to a predetermined opening degree. The high-temperature and high-pressure gas refrigerant discharged from the compressor 11 is condensed by heat exchange with the indoor air supplied by the indoor fan 22 in the indoor heat exchanger 21 to become a liquid refrigerant. At this time, the indoor air is warmed by heat exchange with the gas refrigerant in the indoor heat exchanger 21 and supplied to the room.

Next, the liquid refrigerant from the indoor heat exchanger 21 is decompressed by the expansion valve 14, and then evaporated by heat exchange with the outdoor air supplied by the outdoor fan 16 in the outdoor heat exchanger 13 to become a gas refrigerant. Return to the suction side of the compressor 11.

(During cooling operation)
When the indoor unit 20 performs the cooling operation, the four-way switching valve 15 is switched to the position of the dotted line in FIG. 1 and the operation of the compressor 11 is started. Then, the expansion valve 14 is opened to a predetermined opening degree. The high-temperature and high-pressure gas refrigerant discharged from the compressor 11 is condensed by heat exchange with the outdoor air supplied by the outdoor fan 16 in the outdoor heat exchanger 13 to become a liquid refrigerant.

Next, the liquid refrigerant from the outdoor heat exchanger 13 is decompressed by the expansion valve 14, and then evaporated by heat exchange with the indoor air supplied by the indoor fan 22 in the indoor heat exchanger 21 to become a gas refrigerant. Return to the suction side of the compressor 11. At this time, the indoor air is cooled by heat exchange with the liquid refrigerant in the indoor heat exchanger 21 and supplied to the room.

(During defrosting operation)
The air conditioner 1 of the present embodiment can perform the normal defrosting operation described in detail below and the outdoor fan defrosting operation as the defrosting operation for defrosting the outdoor heat exchanger 13.

The normal defrosting operation is a defrosting operation performed by operating the compressor 11. The air conditioner 1 of the present embodiment executes a so-called reverse cycle defrosting operation as a normal defrosting operation. In the reverse cycle defrosting operation, the four-way switching valve 15 is switched to the position of the dotted line in FIG. 1, the operation of the compressor 11 is started, and the expansion valve 14 is fully opened. As a result, the frost adhering to the outdoor heat exchanger 13 is melted by heat exchange with the high-temperature and high-pressure gas refrigerant discharged from the compressor 11.

In the outdoor fan defrosting operation, when the temperature of the outdoor air detected by the outdoor air temperature sensor 18 is 0 ° C. or higher, the outdoor fan 16 is driven with the compressor 11 stopped. As a result, the frost adhering to the outdoor heat exchanger 13 is melted by heat exchange with the outdoor air supplied to the outdoor heat exchanger 13 by the outdoor fan 16. In this outdoor fan defrosting operation, since the compressor 11 is stopped, the power consumption required for defrosting the outdoor heat exchanger 13 is lower than that in the reverse cycle defrosting operation in which the compressor 11 is operated.

FIG. 2 is a control block diagram of the air conditioner 1 according to the present embodiment.

Referring to FIG. 2, the air conditioner 1 (shown in FIG. 1) includes a control device 30 including a microcomputer, an input / output circuit, and the like. The control device 30 controls the compressor 11, the expansion valve 14, the four-way switching valve 15, the outdoor fan 16, and the indoor fan 22. Further, the control device 30 receives the detection signal from the outdoor heat exchanger temperature sensor 17, the outdoor air temperature sensor 18, and the indoor air temperature sensor 23, and the command signal from the remote controller 31.

The control device 30 includes a determination unit 30a for determining whether or not there is time to execute the outdoor fan defrosting operation, a clock unit 30b for generating the current time t, and an air conditioner 1 (FIG. 1) at the start time ts. A reservation unit 30c for making a reservation to start the operation of the heat pump device (shown in) is provided. The time margin means that the time required for defrosting the outdoor heat exchanger 13 by the outdoor fan defrosting operation is shorter than the time until the next compressor 11 of the air conditioner 1 is started. .. In other words, having time to spare means that even when the outdoor fan defrosting operation is executed, the defrosting of the outdoor heat exchanger 13 can be completed by the time the air conditioner 1 is started next time. ..

In the present embodiment, the reservation unit 30c sets the start time ts by the command signal received from the remote controller 31. Here, the start time ts is, for example, the above-mentioned set time when the air conditioning operation is performed for a predetermined time before the set time so that the temperature of the indoor air becomes the set temperature at the set time set by the user.

Hereinafter, the defrosting operation control performed by the control device 30 during the defrosting operation of the present embodiment will be described with reference to FIGS. 2 to 4.

FIG. 3 is a flowchart illustrating the defrosting operation control performed by the control device 30. This defrosting operation control starts when frost formation on the outdoor heat exchanger 13 is detected. Specifically, the control device 30 determines the magnitude relationship between the temperature T1 of the outdoor heat exchanger 13 detected by the outdoor heat exchanger temperature sensor 17 and the defrosting start temperature, and determines the magnitude relationship between the temperature of the outdoor heat exchanger 13 and the temperature of the outdoor heat exchanger 13. When it is determined that T1 is lower than the defrosting start temperature, the defrosting operation control is started. In the present embodiment, the defrosting start temperature is 7 ° C. lower than the outside air temperature (specifically, the outdoor air temperature T2 detected by the outdoor air temperature sensor 18). For example, when the outdoor air temperature T2 detected by the outdoor air temperature sensor 18 is 2 ° C., the defrosting start temperature is −5 ° C.

First, when the defrosting operation control is started, the control device 30 determines the magnitude relationship between the outdoor air temperature T2 and the reference temperature Ts detected by the outdoor air temperature sensor 18 (step S1). The reference temperature Ts is the temperature of the outdoor air in which the outdoor fan defrosting operation can be performed. In other words, the temperature of the outdoor air is such that the frost adhering to the outdoor heat exchanger 13 can be melted by the outdoor air supplied to the outdoor heat exchanger 13 by the outdoor fan 16. The reference temperature Ts is preferably 0 ° C. or higher, but may be about 0 ° C. or higher. For example, the melting point of frost may be lower than 0 ° C. due to impurities contained in frost, so the reference temperature Ts does not have to be strictly 0 ° C. or higher.

When it is determined in step S1 that the temperature T2 of the outdoor air is equal to or higher than the reference temperature Ts, the control device 30 determines whether or not the determination unit 30a has time to perform the outdoor fan defrosting operation. The process is executed (step S2).

After that, the control device 30 determines whether or not the determination result in the determination process indicates whether or not there is time to perform the outdoor fan defrosting operation (step S3).

In step S3, when it is determined that the determination result in the determination process indicates that there is time to perform the outdoor fan defrosting operation, the outdoor fan defrosting operation control is executed (step S4). The outdoor fan defrosting operation control means that the control device 30 controls the refrigerant circuit and the outdoor heat exchanger 13 so that the air conditioner 1 executes the outdoor fan defrosting operation.

Next, the control device 30 determines the magnitude relationship between the elapsed time te from the start of defrosting and the predetermined time tf (for example, 10 minutes) (step S5).

In step S5, when it is determined that the elapsed time te from the start of defrosting exceeds the predetermined time tf, the outdoor fan defrosting operation control is terminated.

If it is determined in step S5 that the elapsed time te from the start of defrosting is equal to or less than the predetermined time tf, the outdoor fan defrosting operation control is continuously executed, and the process returns to step S1 and repeats steps S1 to S5. .. In other words, the control device 30 controls the air conditioner 1 so as to continue the outdoor fan defrosting operation until it is determined in step S5 that the elapsed time te from the start of defrosting exceeds the predetermined time tf.

Further, when it is determined in step S1 that the temperature T2 of the outdoor air is less than the reference temperature Ts, or when the determination result in the determination process in step S3 has time to perform the outdoor fan defrosting operation. If it is determined that the indication is not shown, the normal defrosting operation control is executed (step S6). The normal defrosting operation control means that the control device 30 controls the refrigerant circuit and the outdoor heat exchanger 13 so that the air conditioner 1 executes the normal defrosting operation.

Next, the control device 30 determines the magnitude relationship between the temperature T1 of the outdoor heat exchanger 13 and the defrosting end temperature Tdf (for example, 5 ° C.) (step S7).

When it is determined in step S7 that the temperature T1 of the outdoor heat exchanger 13 exceeds the defrosting end temperature Tdf, the normal defrosting operation control is terminated.

If it is determined in step S7 that the temperature T1 of the outdoor heat exchanger 13 is equal to or lower than the defrosting end temperature Tdf, the normal defrosting operation control is continuously executed, and the process returns to step S1 to return to steps S1 and S6. Repeat S7. In other words, the control device 30 controls the air conditioner 1 so that the normal defrosting operation is continued until the temperature T1 of the outdoor heat exchanger 13 exceeds the defrosting end temperature Tdf in step S7.

In the defrosting operation control of the present embodiment, when the control device 30 receives an operation start instruction from the remote controller 31 during the outdoor fan defrosting operation control, the control device 30 executes the normal defrosting operation as a refrigerant. It controls the circuit and the outdoor heat exchanger 13. Further, when the temperature T2 of the outdoor air becomes less than the reference temperature Ts during the outdoor fan defrosting operation control, the normal defrosting operation control is executed.

(Determination process)
FIG. 4 is a flowchart illustrating the determination process according to the present embodiment. If the difference between the current time t generated by the clock unit 30b and the start time ts set by the reservation unit 30c is greater than or equal to the predetermined time tr, the determination unit 30a of the present embodiment executes the outdoor fan defrosting operation. Judge that there is time to spare. Here, the predetermined time tr is, for example, 10 minutes. This predetermined time tr may be changed according to, for example, the temperature T2 of the outdoor air detected by the outdoor heat exchanger 13 when the control of the defrosting operation is started.

Referring to FIG. 4, when the determination process of the present embodiment starts, the determination unit 30a of the control device 30 determines whether or not the start time ts is set by the reservation unit 30c (step S31).

When it is determined in step S31 that the start time ts is set, the clock unit 30b generates the current time t (step S32).

After that, the determination unit 30a of the control device 30 calculates the grace time tg from the start time ts set by the reservation unit 30c and the current time t generated by the clock unit 30b (step S33). The grace time tg is the time from the current time t to the start time ts.

Next, the determination unit 30a of the control device 30 determines the magnitude relationship between the grace time tg and the predetermined time tr (step S34).

When it is determined in step S34 that the grace time tg is equal to or longer than the predetermined time tr, the determination unit 30a of the control device 30 determines that there is time to execute the outdoor fan defrosting operation (step S35). In other words, when the difference between the start time ts set by the reservation unit 30c and the current time t generated by the clock unit 30b is greater than or equal to the predetermined time tr, the determination unit 30a of the control device 30 defrosts the outdoor fan. It is determined that there is time to execute the operation. After that, the determination unit 30a of the control device 30 ends the determination process.

Further, when it is determined in step S31 that the start time ts is not set, or when it is determined in step S34 that the grace time tg is less than the predetermined time tr, the determination unit 30a of the control device 30 determines. , It is determined that there is no time to execute the outdoor fan defrosting operation (step S36). After that, the determination unit 30a of the control device 30 ends the determination process.

According to the above embodiment, when the determination unit 30a determines that there is time to execute the outdoor fan defrosting operation, the outdoor fan defrosting operation is executed, so that the user needs to operate the air conditioner 1. Sometimes the defrosting of the outdoor heat exchanger 13 can be completed. Therefore, even when the outdoor fan defrosting operation is executed, the air conditioner 1 can be used when the user needs to operate the air conditioner 1, so that the deterioration of the user's comfort can be suppressed. ..

When the start time ts is set by the reservation unit 30c and the difference between the start time ts and the current time t is greater than or equal to the predetermined time tr, the user intends to use the air conditioner 1 even when the outdoor fan defrosting operation is executed. Assuming that the defrosting of the outdoor heat exchanger 13 has been completed by the start time ts, the air conditioner 1 can be started at the start time ts, so that the deterioration of the user's comfort can be suppressed. As a result, it is possible to reduce the power consumption required for defrosting the outdoor heat exchanger 13 while suppressing the deterioration of the user's comfort.

In the present embodiment, the clock unit 30b generates the current time t, but the present time t is not limited to this, and the current time t may be acquired from a management server or the like (not shown).

In the present embodiment, the reverse cycle defrosting operation is performed as the normal defrosting operation, but the normal cycle defrosting operation may be performed. During the normal cycle defrosting operation, the four-way switching valve 15 is switched to the position shown by the broken line in FIG. 1, the operation of the compressor 11 is started, and the expansion valve 14 is fully opened. As a result, the frost adhering to the outdoor heat exchanger 13 is melted by heat exchange with the high-temperature and high-pressure gas refrigerant discharged from the compressor 11.

[Second Embodiment]
The second embodiment is the same as that of the first embodiment except for the determination process executed by the determination unit 30a to determine whether or not there is time to execute the outdoor fan defrosting operation. Incorporate 3.

The determination unit 30a of the control device 30 of the present embodiment determines that there is time to execute the outdoor fan defrosting operation when the compressor 11 is in the thermo-off state when the compressor 11 is stopped during the air conditioning operation.

(Determination process)
FIG. 5 is a flowchart illustrating a determination process according to the present embodiment. Hereinafter, the determination process executed by the determination unit 30a of the control device 30 of the present embodiment will be described with reference to FIG.

When the determination process is started, the determination unit 30a determines whether or not the compressor 11 is in the thermo-off state in which the compressor 11 is stopped during the air conditioning operation (step S131). Here, during the heating operation, the compressor 11 is stopped when the temperature of the indoor air detected by the indoor air temperature sensor 23 becomes higher than the preset set temperature, and the air conditioner 1 is thermo-off. Become in a state. In the present embodiment, the set temperature is set by a command signal from the remote controller 31.

If it is determined in step S131 that the thermo-off state is present, the determination unit 30a of the control device 30 determines that there is time to execute the outdoor fan defrosting operation (step S132). After that, the determination unit 30a of the control device 30 ends the determination process.

If it is determined in step S131 that the thermo-off state is not present, the determination unit 30a of the control device 30 determines that there is no time to execute the outdoor fan defrosting operation (step S133). After that, the determination unit 30a of the control device 30 ends the determination process.

After that, as shown in FIG. 3, the control device 30 exchanges the refrigerant circuit and the outdoor heat so as to perform the outdoor fan defrosting operation control or the normal defrosting operation control based on the determination result in the determination process in step S2. Control the vessel 13.

In the defrosting operation control of the present embodiment, when the temperature of the indoor air detected by the indoor air temperature sensor 23 becomes lower than the preset set temperature during the outdoor fan defrosting operation control, the control device 30 normally executes defrosting operation control.

According to the above-described embodiment, the same effects as those of the above-mentioned first embodiment are obtained.

According to the above embodiment, in the thermo-off state, the indoor environment is kept comfortable until the next thermo-on, so that it is unlikely that the user will be required to operate the air conditioner 1. Even when the outdoor fan defrosting operation is executed, if the defrosting of the outdoor heat exchanger 13 is completed before the thermo-on, the deterioration of the user's comfort can be suppressed. As a result, it is possible to reduce the power consumption required for defrosting the outdoor heat exchanger 13 while suppressing the deterioration of the user's comfort.

In the first embodiment and the second embodiment, the end determination of the normal defrosting operation control is performed based on the temperature T1 of the outdoor heat exchanger, but the present invention is not limited to this, and the discharge temperature of the compressor 11 is used. It may be done based on.

[Third Embodiment]
FIG. 6 is a block diagram of the hot water unit according to the third embodiment. The hot water unit 100 of the present embodiment is a heat pump type water heater to which the heat pump device according to the present disclosure is applied.

The hot water unit 100 of the present embodiment includes an outdoor unit 110 and a hot water storage unit 120.

The outdoor unit 110 includes a compressor 111, an accumulator 112, an air heat exchanger 113, an expansion valve 114, and a four-way switching valve 115.

The compressor 111 has a built-in motor (not shown). When the compressor 111 is driven by the motor, the compressor sucks the refrigerant from the refrigerant pipe on the suction side of the compressor 111, compresses the refrigerant, and discharges the refrigerant to the refrigerant pipe on the discharge side of the compressor 111. An accumulator 112 is provided in the refrigerant pipe on the suction side of the compressor 111. Further, the compressor 111 is configured so that the operating frequency can be changed according to the control of the control device 130 (shown in FIG. 7).

The air heat exchanger 113 is a heat exchanger that exchanges heat between the refrigerant flowing through the refrigerant circuit and the outdoor air. The air heat exchanger 113 functions as an evaporator during the boiling operation. The air heat exchanger 113 is an example of the heat source side heat exchanger according to the present disclosure.

The expansion valve 114 depressurizes the refrigerant passing through the expansion valve 114 and adjusts the flow rate of the refrigerant passing through the expansion valve 114. The expansion valve 114 is provided in a refrigerant pipe that connects the air heat exchanger 113 and the hot water storage unit 120. The expansion valve 114 adjusts the flow rate of the refrigerant flowing through the hot water storage unit 120 by adjusting the opening degree of the expansion valve 114 in the boiling operation and the defrosting operation. Further, the expansion valve 114 is configured so that the opening degree can be adjusted by the control of the control device 130 (shown in FIG. 7). The expansion valve 114 is an example of the expansion mechanism according to the present disclosure.

The four-way switching valve 115 includes a first port 115a, a second port 115b, a third port 115c, and a fourth port 115d. The first port 115a is connected to the discharge port of the compressor 111, and the second port 115b is connected to the suction port of the compressor 111. Further, the third port 115c is connected to the air heat exchanger 113, and the fourth port 115d is connected to the hot water storage unit 120, respectively. The four-way switching valve 115 communicates the first port 115a and the fourth port 115d, and communicates the second port 115b and the third port 115c during the boiling operation (the switching position of the solid line in the figure). Also. The four-way switching valve 115 communicates the first port 115a and the third port 115c, and communicates the second port 115b and the fourth port 115d during the normal defrosting operation (reverse cycle defrosting operation) described below. (Switching position of the broken line in the figure). The four-way switching valve 115 is configured so that the switching position of the solid line in the figure and the switching position of the broken line in the figure can be switched by the control of the control device 130 (shown in FIG. 7).

Further, the outdoor unit 110 includes an outdoor fan 116 that supplies outdoor air to the air heat exchanger 113, an air heat exchanger temperature sensor 117 that detects the temperature of the air heat exchanger 113, and an outdoor unit that detects the temperature of the outdoor air. It is further equipped with an air temperature sensor 118. The outdoor air temperature sensor 18 is an example of the outdoor temperature detection unit according to the present disclosure.

The outdoor fan 116 is configured so that the rotation speed can be changed according to the control of the control device 130 (shown in FIG. 7). The outdoor fan 116 is an example of the heat source side fan according to the present disclosure.

The hot water storage unit 120 includes a hot water storage tank 121 and a water heat exchanger 122 that generates hot water stored in the hot water storage tank 121.

One of the water inlet pipes WP1a branched from the water supply pipe WP1 connected to the water supply source 140 is connected to the bottom of the hot water storage tank 121. As a result, the hot water unit 100 can introduce the city water (tap water) of the water supply source 140 into the hot water storage tank 121 via the water inlet pipe WP1a.

One end of the circulation pipe CP1 is connected to the bottom of the hot water storage tank 121. The other end of the circulation pipe CP1 is connected to one end of the water passage 122a of the water heat exchanger 122. The circulation pipe CP1 is provided with a circulation pump 123 that supplies the water stored in the lower part of the hot water storage tank 121 to the water passage 122a of the water heat exchanger 122.

One end of the circulation pipe CP2 is connected to the top of the hot water storage tank 121. The other end of the circulation pipe CP2 is connected to the other end of the water passage 122a of the water heat exchanger 122. As a result, the circulation pipe CP2 communicates with the circulation pipe CP1 via the water passage 122a of the water heat exchanger 122.

Further, one end of the hot water supply pipe WP2 is connected to the top of the hot water storage tank 121. A hot water supply terminal 141 is connected to the other end of the hot water supply pipe WP2. The hot water supply pipe WP2 is provided with a mixing valve 142. The other water inlet pipe WP1b branched from the water supply pipe WP1 is connected to the mixing valve 142. As a result, the hot water discharged from the top of the hot water storage tank 121 is mixed with the water supplied from the water supply source 140, and the hot water supply terminal 141 can supply hot water at a desired temperature.

Further, the hot water storage tank 121 is provided with a hot water storage amount detecting unit 124 for detecting the hot water storage amount A. The hot water storage amount detecting unit 124 is provided in order from the upper side to the lower side of the hot water storage tank 121, the first temperature sensor 124a, the second temperature sensor 124b, the third temperature sensor 124c, the fourth temperature sensor 124d, and the fifth temperature. It has a sensor 124e.

The first temperature sensor 124a, the second temperature sensor 124b, the third temperature sensor 124c, the fourth temperature sensor 124d, and the fifth temperature sensor 124e each detect the temperature at the height position provided. The temperature detected at the height position where each of the first temperature sensor 124a, the second temperature sensor 124b, the third temperature sensor 124c, the fourth temperature sensor 124d, and the fifth temperature sensor 124e is provided is from the target hot water supply temperature Th. When it is also high, it indicates that there is hot water at that height position.

Specifically, when the temperature detected by the first temperature sensor 124a is equal to or lower than the target hot water supply temperature Th (for example, 45 ° C.), the amount of hot water stored A is almost nonexistent, and the fifth temperature sensor 124e supplies the target hot water. When the temperature is higher than Th, the hot water storage amount A is almost full. Here, in the present embodiment, the amount of hot water stored A when the temperature T3 detected by the second temperature sensor 124b is the target hot water supply temperature Th is defined as the amount of hot water stored for determining hot water running out. That is, when the temperature T3 detected by the second temperature sensor 124b is higher than the target hot water supply temperature Th, the hot water storage amount A is larger than the hot water shortage determination hot water storage amount As, and the temperature T3 detected by the second temperature sensor 124b is the target hot water supply. When the temperature is Th or less, the hot water storage amount A is smaller than the hot water storage amount As determined to be out of hot water, and it is assumed that the hot water is out.

The water heat exchanger 122 is a heat exchanger that exchanges heat between the refrigerant flowing through the refrigerant circuit and the water supplied to the water heat exchanger 122 by the circulation pump 123. The water heat exchanger 122 functions as a condenser during the boiling operation. Specifically, the high-temperature refrigerant from the compressor 111 passes through the refrigerant passage 122b of the water heat exchanger 122 and exchanges heat with the water in the water passage 122a of the water heat exchanger 122. As a result, the water from the hot water storage tank 121 becomes hot water in the water heat exchanger 122. The water heat exchanger 122 is an example of the user-side heat exchanger according to the present disclosure.

In the present embodiment, the compressor 111, the accumulator 112, the four-way switching valve 115, the air heat exchanger 113, the expansion valve 114, the refrigerant passage 122b of the water heat exchanger 122, and the refrigerant piping connecting these are connected. The refrigerant circuit is composed of and.

The hot water unit 100 of the present embodiment can perform a boiling operation and a defrosting operation. Hereinafter, the operation of the air conditioner 1 during the boiling operation and the defrosting operation will be described.

(During boiling operation)
When the boiling operation is performed by the hot water unit 100, the four-way switching valve 115 is switched to the position of the solid line in FIG. 1 and the operation of the compressor 111 is started. Then, the expansion valve 114 is opened to a predetermined opening degree. The high-temperature and high-pressure gas refrigerant discharged from the compressor 111 is condensed by heat exchange with the water supplied by the circulation pump 123 in the water heat exchanger 122 to become a liquid refrigerant. At this time, the water supplied by the circulation pump 123 in the water heat exchanger 122 is warmed by heat exchange with the gas refrigerant in the water heat exchanger 122 and supplied to the top of the hot water storage tank 121.

Next, the liquid refrigerant from the water heat exchanger 122 is decompressed by the expansion valve 114 and then evaporated by heat exchange with the outdoor air supplied by the outdoor fan 116 in the air heat exchanger 113 to become a gas refrigerant. Return to the suction side of the compressor 111.

(During defrosting operation)
The hot water unit 100 of the present embodiment can perform the normal defrosting operation described in detail below and the outdoor fan defrosting operation as the defrosting operation of the air heat exchanger 113.

The normal defrosting operation is a defrosting operation performed by operating the compressor 11. The hot water unit 100 of the present embodiment executes a so-called reverse cycle defrosting operation as a normal defrosting operation. In the reverse cycle defrosting operation, the four-way switching valve 115 is switched to the position of the dotted line in FIG. 1, the operation of the compressor 111 is started, and the expansion valve 114 is fully opened. As a result, the frost adhering to the air heat exchanger 113 is melted by heat exchange with the high-temperature and high-pressure gas refrigerant discharged from the compressor 111.

In the outdoor fan defrosting operation, when the temperature of the outdoor air detected by the outdoor air temperature sensor 118 is 0 ° C. or higher, the outdoor fan 116 is driven with the compressor 111 stopped. As a result, the frost adhering to the air heat exchanger 113 is melted by heat exchange with the outdoor air supplied to the air heat exchanger 113 by the outdoor fan 116. In this outdoor fan defrosting operation, since the compressor 111 is stopped, the power consumption required for defrosting the air heat exchanger 113 is lower than that in the reverse cycle defrosting operation in which the compressor 111 is operated.

FIG. 7 is a control block diagram of the hot water unit 100 according to the present embodiment.

Referring to FIG. 7, the hot water unit 100 (shown in FIG. 1) includes a control device 130 including a microprocessor and an input / output circuit. The control device 130 controls the compressor 111, the expansion valve 114, the four-way switching valve 115, the outdoor fan 116, and the circulation pump 123. Further, the control device 130 receives the detection signal from the air heat exchanger temperature sensor 117, the outdoor air temperature sensor 118, the hot water storage amount detection unit 124, and the command signal from the remote controller 131.

The control device 130 includes a determination unit 130a for determining whether or not there is time to execute the outdoor fan defrosting operation, a clock unit 130b for generating the current time t, and a setting unit for setting an operation schedule for the boiling operation. It is equipped with 130c.

The setting unit 130c of the present embodiment sets the operation schedule of the boiling operation based on the actual results of the hot water storage amount and the hot water supply amount detected by the hot water storage amount detection unit 124. The setting unit 130c may receive an operation schedule from a management server or the like (not shown) and set an operation schedule for boiling operation.

Hereinafter, the defrosting operation control performed by the control device 130 of the present embodiment will be described. Further, the third embodiment is the same as the first embodiment except for the determination process executed by the determination unit 130a to determine whether or not there is time to execute the outdoor fan defrosting operation. Incorporate 3.

The determination unit 130a of the control device 130 of the present embodiment determines that there is time to execute the outdoor fan defrosting operation when the current time t generated by the clock unit 130b is the night time zone.

(Determination process)
FIG. 8 is a flowchart illustrating a determination process according to the present embodiment. Hereinafter, the determination process executed by the determination unit 130a of the control device 130 of the present embodiment will be described with reference to FIGS. 6 to 8.

When the determination process is started, the clock unit 130b generates the current time t (step S231).

Next, the determination unit 130a of the control device 130 determines whether or not the current time t is in the night time zone (step S232). The night time zone in the present embodiment is a time zone set by the electric power company, for example, a time zone from 11:00 pm to 7:00 am the next day.

When it is determined in step S232 that the current time t is the night time zone, the determination unit 130a of the control device 130 determines that there is time to execute the outdoor fan defrosting operation (step S233). After that, the determination unit 130a of the control device 130 ends the determination process.

If it is determined in step S232 that the current time t is not in the night time zone, the determination unit 130a of the control device 130 determines that there is no time to execute the outdoor fan defrosting operation (step S234). After that, the determination unit 130a of the control device 130 ends the determination process.

After that, as shown in FIG. 3, the control device 130 performs outdoor fan defrosting operation control or normal defrosting operation control based on the determination result in the determination process in step S2.

In the present embodiment, when the current time t becomes the daytime time zone during the outdoor fan defrosting operation control, the control device 130 normally executes the defrosting operation control.

In the present embodiment, the clock unit 130b generates the current time t, but the present time t is not limited to this, and the current time t may be acquired from a management server or the like (not shown).

According to the above-described embodiment, the same effects as those of the above-mentioned first embodiment are obtained.

According to the above embodiment, in the night time zone, there is often a time margin for the boiling operation, and even if the outdoor fan defrosting operation is performed, the hot water supply to the user is not affected so much. The decrease in comfort can be suppressed. Therefore, it is possible to reduce the power consumption required for defrosting the air heat exchanger 113 while suppressing the deterioration of the user's comfort.

[Fourth Embodiment]
The fourth embodiment is the same as that of the third embodiment except for the determination process executed by the determination unit 130a to determine whether or not there is time to execute the outdoor fan defrosting operation. 6 and 7 are used.

The determination unit 130a of the control device 130 of the present embodiment determines that there is time to execute the outdoor fan defrosting operation when the hot water is not exhausted. In other words, when the hot water storage amount A detected by the hot water storage amount detection unit 124 is larger than the preset hot water shortage determination hot water storage amount As, it is determined that there is time to execute the outdoor fan defrosting operation.

(Determination process)
FIG. 9 is a flowchart of the determination process according to the present embodiment. Hereinafter, the determination process executed by the determination unit 130a of the control device 130 of the present embodiment will be described with reference to FIGS. 3, 6, 7, and 9.

When the determination process is started, the determination unit 130a of the control device 130 determines whether or not the hot water has run out. In the present embodiment, as described above, it is said that the hot water is exhausted when the temperature T3 detected by the second temperature sensor 124b attached to the hot water storage tank 121 is equal to or lower than the target hot water supply temperature Th. That is, as shown in FIG. 9, the magnitude relationship between the temperature T3 detected by the second temperature sensor 124b attached to the hot water storage tank 121 and the target hot water supply temperature Th (45 ° C. in this embodiment) is determined (step S331). ).

If it is determined in step S331 that the hot water has not run out, the determination unit 130a of the control device 130 determines that there is time to execute the outdoor fan defrosting operation (step S332). That is, in step S332, when the temperature T3 detected by the second temperature sensor 124b in step S331 is determined to be higher than the target hot water supply temperature Th, the determination unit 130a of the control device 130 is the time to execute the outdoor fan defrosting operation. Judge that there is a margin. After that, the determination unit 130a of the control device 130 ends the determination process.

Further, when it is determined in step S331 that the hot water has run out, the determination unit 130a of the control device 130 determines that there is no time to execute the outdoor fan defrosting operation (step S333). That is, in step S333, when it is determined in step S331 that the temperature T3 detected by the second temperature sensor 124b is equal to or lower than the target hot water supply temperature Th, the determination unit 130a of the control device 130 executes the outdoor fan defrosting operation. Judge that there is no time to spare. After that, the determination unit 130a of the control device 130 ends the determination process.

After that, as shown in FIG. 3, the control device 130 performs outdoor fan defrosting operation control or normal defrosting operation control based on the determination result in the determination process in step S2.

Further, in the defrosting operation control of the present embodiment, when the hot water runs out during the outdoor fan defrosting operation control, the control device 130 normally executes the defrosting operation control. In other words, when the temperature T3 detected by the second temperature sensor 124b becomes equal to or lower than the target hot water supply temperature Th, the control device 130 normally executes the defrosting operation control.

According to the above-described embodiment, the same effects as those of the above-mentioned first embodiment are obtained.

According to the above embodiment, since the amount of hot water stored in the hot water storage tank 121 is larger than the amount of hot water stored as determined to run out of hot water, even if the outdoor fan defrosting operation is executed, the hot water supply to the user is not affected so much that the user is comfortable. It is possible to suppress the deterioration of sex. Therefore, it is possible to reduce the power consumption required for defrosting the air heat exchanger 113 while suppressing the deterioration of the user's comfort.

In the present embodiment, the hot water storage amount A when the temperature T3 detected by the second temperature sensor 124b is the target hot water supply temperature Th is set as the hot water shortage determination hot water storage amount As, but the hot water shortage judgment hot water storage amount As is the third temperature sensor. The amount of hot water stored A when the temperature of 124c is the target hot water supply temperature Th may be used. Similarly, the hot water storage amount As for determining hot water shortage may be the hot water storage amount A when the temperature of the fourth temperature sensor 124d is the target hot water supply temperature Th, and the hot water storage amount when the temperature of the fifth temperature sensor 124e is the target hot water supply temperature Th. It may be the amount A. That is, the hot water storage amount As for determining the hot water shortage may be larger than the actual hot water storage amount A when the hot water runs out.

[Fifth Embodiment]
The fifth embodiment is the same as the third embodiment except for the determination process executed by the determination unit 130a to determine whether or not there is time to execute the outdoor fan defrosting operation. 6 and 7 are used.

The determination unit 130a of the control device 130 of the present embodiment determines that there is time to execute the outdoor fan defrosting operation when the boiling operation is performed according to the operation schedule set by the setting unit 130c.

(Determination process)
FIG. 10 is a flowchart of the determination process according to the present embodiment. Hereinafter, the determination process executed by the determination unit 130a of the control device 130 of the present embodiment will be described with reference to FIGS. 3, 6, 7, and 10.

When the determination process is started, the determination unit 130a of the control device 130 determines whether or not the hot water unit 100 is in the scheduled operation (step S431).

When it is determined in step S431 that the scheduled operation is in progress, the determination unit 130a of the control device 130 determines that there is time to execute the outdoor fan defrosting operation (step S432). After that, the determination unit 130a of the control device 130 ends the determination process.

If it is determined in step S431 that the scheduled operation is not in progress, the determination unit 130a of the control device 130 determines that there is no time to execute the outdoor fan defrosting operation (step S433). After that, the determination unit 130a of the control device 130 ends the determination process.

After that, as shown in FIG. 3, the control device 130 performs outdoor fan defrosting operation control or normal defrosting operation control based on the determination result in the determination process in step S2.

Further, in the defrosting operation control of the present embodiment, when the user receives an instruction of the boiling operation during the outdoor fan defrosting operation control, the control device 130 normally executes the defrosting operation control.

According to the above-described embodiment, the same effects as those of the above-mentioned third embodiment are obtained.

According to the above embodiment, when the boiling operation is performed according to the operation schedule set by the setting unit 130c, this boiling operation is not instructed by the user, so that even when the outdoor fan defrosting operation is executed, the boiling operation is performed. Since there is little effect on the hot water supply to the user, it is possible to suppress the deterioration of the user's comfort. Therefore, it is possible to reduce the power consumption required for defrosting the air heat exchanger 113 while suppressing the deterioration of the user's comfort.

Although the embodiments have been described above, it will be understood that various modifications of the embodiments and details are possible without departing from the purpose and scope of the claims.

For example, in the first embodiment and the second embodiment, the outdoor unit 10 of the air conditioner 1 includes the outdoor air temperature sensor 18, and the control device 30 receives the detection signal from the outdoor air temperature sensor 18. However, it is not limited to this. The control device 30 may use the output of another device that detects the temperature of the outdoor air. The outdoor air temperature sensor may be retrofitted.

Further, in the third embodiment, the outdoor unit 110 of the hot water unit 100 is provided with the outdoor air temperature sensor 118, and the control device 130 receives the detection signal from the outdoor air temperature sensor 118, but the present invention is limited to this. Not done. The control device 130 may use the output of another device that detects the temperature of the outdoor air. The outdoor air temperature sensor may be retrofitted.

1 ... Air conditioner 10 ... Outdoor unit 11 ... Compressor 12 ... Accumulator 13 ... Outdoor heat exchanger 14 ... Expansion valve 15 ... Four-way switching valve 15a ... 1st port 15b ... 2nd port 15c ... 3rd port 15d ... No. 4 ports 16 ... Outdoor fan 17 ... Outdoor heat exchanger temperature sensor 18 ... Outdoor air temperature sensor 20 ... Indoor unit 21 ... Indoor heat exchanger 22 ... Indoor fan 23 ... Indoor air temperature sensor 30 ... Control device 30a ... Judgment unit 30b ... Clock unit 30c ... Reservation unit 31 ... Remote controller 100 ... Hot water unit 110 ... Outdoor unit 111 ... Compressor 112 ... Accumulator 113 ... Air heat exchanger 114 ... Expansion valve 115 ... Four-way switching valve 115a ... First port 115b ... Second Port 115c ... 3rd port 115d ... 4th port 116 ... Outdoor fan 117 ... Air heat exchanger temperature sensor 118 ... Outdoor air temperature sensor 120 ... Hot water storage unit 121 ... Hot water storage tank 122 ... Water heat exchanger 123 ... Circulation pump 124 ... Hot water storage Quantity detection unit 124a ... 1st temperature sensor 124b ... 2nd temperature sensor 124c ... 3rd temperature sensor 124d ... 4th temperature sensor 124e ... 5th temperature sensor 130 ... Control device 130a ... Judgment unit 130b ... Clock unit 130c ... Setting unit 131 … Remote controller

Claims (6)

A refrigerant circuit including a compressor (11,111), a heat exchanger on the user side (21,122), an expansion mechanism (14,114), and a heat exchanger on the heat source side (13,113).
The heat source side fan (16,116) that supplies air to the heat source side heat exchanger (13,113) and
The refrigerant circuit and the control device (30,130) for controlling the heat source side fan (16,116) are provided.
The control device (30, 130) has a determination unit (30a, 130a) for determining whether or not there is time to perform the defrosting operation by the heat source side fan (16, 116).
The control device (30, 130) is described when the outdoor temperature (T2) is equal to or higher than the reference temperature (Ts) and the determination unit (30a, 130a) determines that the time margin is sufficient. The refrigerant circuit and the heat source side fan (16, 116) are controlled so that the heat source side fan (16, 116) is rotated with the compressor (11, 111) stopped to perform the defrosting operation. A heat pump device characterized by the fact that. The heat pump device according to claim 1 and
A clock unit (30b) that acquires or generates the current time (t), and
A reservation unit (30c) for making a reservation to start the operation of the heat pump device at the start time (ts) is provided.
In the determination unit (30a), the operation of the heat pump device is reserved by the reservation unit (30c), and the difference between the current time (t) and the start time (ts) is a predetermined time (tr) or more. An air conditioner (1), characterized in that it is determined that there is time to spare in some cases. The heat pump device according to claim 1 and
Equipped with an indoor temperature detector (23) that detects the indoor temperature,
The air conditioner (1) is characterized in that the determination unit (30a) determines that the compressor (11) has a time margin when the compressor (11) is stopped during the air conditioning operation in the thermo-off state. The heat pump device according to claim 1 and
It is equipped with a clock unit (130b) that acquires or generates the current time (t).
The determination unit (130a) is characterized in that it determines that there is a time margin when the current time (t) acquired or generated by the clock unit (130b) is in the night time zone. Hot water unit (100). The heat pump device according to claim 1 and
A hot water storage tank (121) for storing hot water heated by the user-side heat exchanger (122), and a hot water storage tank (121).
A hot water storage amount detection unit (124) for detecting the amount of hot water stored in the hot water storage tank (121) is provided.
When the hot water storage amount (A) detected by the hot water storage amount detection unit (124) is larger than the preset hot water shortage determination hot water storage amount (As), the determination unit (130a) has the time allowance. A hot water unit (100), characterized in that it is determined to be present. The heat pump device according to claim 1 and
It is equipped with a setting unit (130c) for setting the operation schedule of the heat pump device.
The hot water unit is characterized in that the determination unit (130a) determines that there is a time margin when the heat pump device is operated according to the operation schedule set by the setting unit (130c). (100).

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