JP2005147584A - Start-up controller and start-up control method for heat pump hot water supply apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a start-up controller and a start-up control method for a heat pump hot water supply apparatus, allowing solution of a problem of liquid compression in a compressor even without an accumulator. <P>SOLUTION: This start-up controller for the heat pump hot water supply apparatus has: a heat pump circuit having the compressor and a heat radiator; and a hot water storage circuit storing hot water heated by the heat radiator in a hot water storage tank. The heat pump circuit has no receiver nor accumulator, uses a compressor having a variable rotational speed as the compressor, and performs frequency control in a start-up operation area from start-up time of the compressor to stable time. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention comprises a heat pump circuit having a compressor and a radiator, and a hot water storage circuit for storing hot water heated by the radiator in a hot water storage tank, using a compressor with a variable rotation speed as the compressor, and starting the compressor The present invention relates to a start-up control device and a start-up control method for a heat pump water heater that performs frequency control in a start-up operation region from time to time.

Conventionally, various hot water supply apparatuses using a heat pump cycle have been proposed. For example, a hot water supply apparatus including a receiver has been proposed (see, for example, Patent Document 1).
Many hot water supply devices using a heat pump cycle are provided with an accumulator on the suction side piping of the compressor for the purpose of preventing liquid compression in the compressor (see, for example, Patent Document 2).
JP 2003-65616 A Japanese Patent No. 3393601

However, in the conventional heat pump hot water supply apparatus, there are a compressor, a radiator, and an evaporator as the heat pump circuit, and a hot water storage tank as the hot water storage circuit, so that the entire apparatus becomes extremely large.
Therefore, in order to reduce the size of the apparatus, it is effective to eliminate the components necessary for the apparatus. For example, in order to target receivers and accumulators, it is necessary to solve the problem of liquid compression in the compressor. There is.

  Therefore, an object of the present invention is to provide a startup control device and a startup control method for a heat pump hot water supply device that can solve the problem of liquid compression in a compressor even without an accumulator.

An activation control device for a heat pump hot water supply apparatus according to claim 1 comprises a heat pump circuit having a compressor and a radiator, and a hot water storage circuit for storing hot water heated by the radiator in a hot water storage tank, and the heat pump The circuit does not include a receiver and an accumulator, uses a variable-speed compressor as the compressor, performs frequency control in the startup operation region from the start of the compressor to the stable time, and performs predetermined control in the start-up operation region. A start-up control device for a heat pump hot-water supply device having at least one constant frequency region for maintaining a frequency.
A start control device for a heat pump hot water supply apparatus according to claim 2 comprises a heat pump circuit having a compressor and a radiator, and a hot water storage circuit for storing hot water heated by the radiator in a hot water storage tank, and the heat pump The circuit does not include a receiver and an accumulator, uses a compressor with a variable rotation speed as the compressor, and performs a start-up control device for a heat pump water heater that performs frequency control in a start-up operation region from the start-up time to the stable time of the compressor In this case, at least the first operation region and the second operation region executed after the first operation region are stored in advance as the start-up operation region, and the first operation region has a predetermined value. A first constant frequency region for maintaining the frequency, and a first variable frequency region for gradually increasing the operating frequency to a predetermined frequency in the first constant frequency region. The second operation region includes a second constant frequency region that maintains a predetermined frequency, and an operation frequency gradually from a predetermined frequency in the first constant frequency region to a predetermined frequency in the second constant frequency region. And a second variable frequency region to be changed.
According to a third aspect of the present invention, in the start-up control device for the heat pump hot water supply device according to the second aspect, the operating frequency at the time of stability of the compressor may be a season, an incoming water temperature, an outside air temperature, a user set temperature, or the like. The frequency can be changed according to the operating conditions, a predetermined frequency range is stored as the operable frequency in the second constant frequency region, and the operating frequency in the second constant frequency region is stored when the compressor is stable. It is characterized by having a configuration that can be changed according to the operating frequency.
According to a fourth aspect of the present invention, in the activation control device for the heat pump hot water supply device according to the third aspect, an outside air temperature detecting means for detecting an outside air temperature, and an incoming water temperature detecting means for detecting a water temperature introduced into the radiator. A stable operation condition data storage means storing relational data between the outside air temperature and the incoming water temperature and the stable operation frequency of the compressor; and a startup operation area condition data storage means storing condition data of the startup operation area; A stable operation frequency determining means for determining a stable operation frequency from the detected value from the outside air temperature detecting means and the incoming water temperature detecting means and the condition data stored in the stable operation time condition data storage means; From the stable operation frequency determined by the stable operation frequency determining means and the condition data stored in the start-up operation area condition data storage means, the second Characterized in that a starting operation area operation frequency determination means for determining the operating frequency in the frequency domain.
According to a fifth aspect of the present invention, in the start-up control device for a heat pump hot water supply device according to any one of the first to fourth aspects, the suction refrigerant is introduced into the compression chamber as the compressor and discharged from the compression chamber. A high-pressure compressor that discharges the refrigerant into the shell is used.
According to a sixth aspect of the present invention, in the activation control device for a heat pump hot water supply device according to any one of the first to fourth aspects, the refrigerant in the compression chamber is shelled when the compression chamber of the compressor exceeds a predetermined pressure. It is characterized by providing a bypass mechanism for discharging inside.
According to a seventh aspect of the present invention, in the start-up control device for a heat pump hot water supply device according to any one of the first to fourth aspects, the defrosting operation in which the expansion valve is opened to defrost the evaporator, In the start control device of the heat pump hot water supply device that performs switching control to hot water storage operation in which hot water heated by a radiator is stored in the hot water storage tank, the start operation region is executed at the time of switching from the defrosting operation to the hot water storage operation. A defrost return operation region is stored in advance, and the defrost return operation region includes a constant frequency region at the time of return to maintain a predetermined frequency, and a predetermined frequency region at the time of return from the operation frequency at the time of the defrost operation. And a variable frequency region at the time of return for gradually decreasing the operating frequency to the frequency.
The invention according to claim 8 is the activation control device for the heat pump hot water supply device according to any one of claims 1 to 4, wherein carbon dioxide is used as a refrigerant, and the compressor is critical on the high pressure side of the heat pump circuit. It is characterized by operating in a state exceeding the pressure.
The start control method for the heat pump water heater of the present invention according to claim 9 includes a heat pump circuit having a compressor and a radiator, a hot water storage circuit for storing hot water heated by the radiator in a hot water storage tank, and detecting an outside air temperature. An outside air temperature detecting means and an incoming water temperature detecting means for detecting a water temperature to be introduced into the radiator, and a compressor having a variable rotational speed is used as the compressor, and the compressor is started up from a start time to a stable time. A start control method of a heat pump water heater that performs frequency control in an operation time, wherein at least a first operation region and a second operation region that is executed after the first operation region as the start operation region. The first operation area is stored in advance, and the first operation frequency is gradually increased to a first constant frequency area for maintaining a predetermined frequency and a predetermined frequency in the first constant frequency area. A first variable frequency region, and the second operating region includes a second constant frequency region for maintaining a predetermined frequency and the second constant frequency region based on the predetermined frequency in the first constant frequency region. A second variable frequency region that gradually changes the operating frequency to a predetermined frequency in the frequency region, and a compressor based on the outside air temperature detected by the outside air temperature detecting means and the incoming water temperature detected by the incoming water temperature detecting means The stable operation frequency is determined, and when the determined stable operation frequency is higher than the operation frequency of the second constant frequency region, the first variable frequency region, the first variable frequency region, By operating the constant frequency region, the second variable frequency region, and the second constant frequency region in order, and then gradually or stepwise increasing the operation frequency of the compressor to the stable operation frequency Start-up If the determined operation frequency at the time of stability is lower than the operation frequency in the second constant frequency region, the first variable frequency region, the first constant frequency region, the first 2 variable frequency region and the second constant frequency region are operated in order, and then the start-up control is performed by gradually or stepwise decreasing the operation frequency of the compressor to the stable operation frequency. Features.
The start control method of the heat pump hot water supply apparatus according to claim 10 includes a heat pump circuit having a compressor and a radiator, a hot water storage circuit for storing hot water heated by the radiator in a hot water storage tank, and detecting an outside air temperature. An outside air temperature detecting means and an incoming water temperature detecting means for detecting a water temperature to be introduced into the radiator, and a compressor having a variable rotational speed is used as the compressor, and the compressor is started up from a start time to a stable time. A start control method of a heat pump water heater that performs frequency control in an operation time, wherein at least a first operation region and a second operation region that is executed after the first operation region as the start operation region. The first operation region is stored in advance, and the first operation region gradually increases the operation frequency up to a first constant frequency region that maintains a predetermined frequency and a predetermined frequency in the first constant frequency region. A first variable frequency region, and the second operating region includes a second constant frequency region for maintaining a predetermined frequency, and the second constant frequency region from the predetermined frequency in the first constant frequency region. A second variable frequency region for gradually changing the operating frequency to a predetermined frequency in the frequency region, storing a predetermined range of frequencies as the operable frequency in the second constant frequency region, and detecting the outside air temperature A stable operating frequency of the compressor is determined from the outside air temperature detected by the means and the incoming water temperature detected by the incoming water temperature detecting means, and the determined operating frequency of the compressor is the second constant frequency region. When the frequency is higher than the maximum frequency, the operating frequency in the second constant frequency region is set as the maximum frequency, and the first variable frequency region, the first constant frequency region, and the second variable frequency region , And the second constant frequency region in order, and then starting control is performed by gradually or stepwise increasing the operating frequency of the compressor to the stable operating frequency, and the determined stable time is When the operation frequency is a frequency in a predetermined range of the second constant frequency region, the operation frequency in the second constant frequency region is set as the operation frequency at the stable time, the first variable frequency region, The start control is performed by sequentially operating the first constant frequency region, the second variable frequency region, and the second constant frequency region, and the determined operation frequency at the stable time is the second If the operating frequency in the second constant frequency region is lower than the minimum frequency, the first variable frequency region, the first constant frequency region, the second frequency Variable frequency range , And the second constant frequency region in order, and then the starting control is performed by gradually or stepwise decreasing the operating frequency of the compressor until the operating frequency at the time of stabilization.
The invention according to claim 11 is the start control method of the heat pump hot water supply device according to claim 9 or claim 10, further comprising a defrosting completion detecting means for detecting the end of the defrosting operation, and opening the expansion valve. In the switching control from the defrosting operation in which the evaporator is defrosted to the hot water storage operation in which the hot water heated by the radiator is stored in the hot water storage tank, the defrosting operation is changed to the hot water storage operation as the startup operation region. The defrost return operation region to be executed at the time of switching is stored in advance, and the defrost return operation region includes a constant frequency region at the time of maintaining a predetermined frequency and an operation frequency at the time of the defrost operation. A variable frequency region at the time of return that gradually decreases the operating frequency to a predetermined frequency in the constant frequency region, and when the defrost completion detection is detected from the defrost completion detection means, And the constant frequency region at the time of return, and switching to the hot water storage operation by restricting the expansion valve during operation in the constant frequency region at the time of return, and then the compressor to the stable operation frequency. The switching control is performed by increasing the operation frequency gradually or stepwise.
According to a twelfth aspect of the present invention, in the activation control method of the heat pump hot water supply apparatus according to the ninth or tenth aspect, carbon dioxide is used as a refrigerant, and the compressor exceeds a critical pressure on the high pressure side of the heat pump circuit. It is characterized by driving in a state.

  According to the present invention, at least one constant frequency region that maintains a predetermined frequency in the start-up operation region is provided, thereby avoiding problems due to liquid compression, while coping with liquid return to the compressor during the start-up operation time. Early start-up operation can be performed. Therefore, a quick start-up operation can be realized without providing an accumulator or receiver and without causing a problem of liquid compression.

The start-up control device for the heat pump hot water supply apparatus according to the first embodiment of the present invention is stable from the start of the compressor by using a variable-speed compressor as the compressor without including a receiver and an accumulator in the heat pump circuit. The frequency control in the start-up operation region until the time is performed, and at least one constant frequency region that maintains a predetermined frequency in the start-up operation region is provided. Liquid compression after the shell temperature of the compressor has risen sufficiently can be avoided by optimizing the amount of refrigerant sealed in the heat pump circuit, but during startup operation time when the shell temperature has not risen sufficiently A large amount of liquid refrigerant flows into the compressor. According to the present embodiment, by providing at least one constant frequency region that maintains a predetermined frequency in the start-up operation region, the problem of liquid compression is avoided to cope with liquid return to the compressor during the start-up operation time. However, an early start-up operation can be performed. Therefore, a quick start-up operation can be realized without providing an accumulator or receiver and without causing a problem of liquid compression.
The activation control device for the heat pump water heater according to the second embodiment of the present invention includes at least a first operation region and a second operation region that is executed after the first operation region as the activation operation region. The first operation region is stored in advance, and a first constant frequency region for maintaining a predetermined frequency and a first variable frequency region for gradually increasing the operation frequency to a predetermined frequency in the first constant frequency region are stored in the first operation region. The second operation region has a second constant frequency region for maintaining a predetermined frequency, and the operation frequency is gradually changed from a predetermined frequency in the first constant frequency region to a predetermined frequency in the second constant frequency region. And a second variable frequency region. Liquid compression after the shell temperature of the compressor has risen sufficiently can be avoided by optimizing the amount of refrigerant sealed in the heat pump circuit, but during startup operation time when the shell temperature has not risen sufficiently A large amount of liquid refrigerant flows into the compressor. The liquid return to the compressor during the startup operation time occurs immediately after startup and after a predetermined time has elapsed. According to the present embodiment, at least the first operation region and the second operation region that is executed after the first operation region are stored in advance as the start operation region, and the first constant frequency region and By providing the second constant frequency region, the liquid return to the compressor immediately after startup avoids problems due to liquid compression by the first constant frequency region, and the liquid to the compressor after a predetermined time has elapsed. For the return, avoiding the problem due to the liquid compression by the second constant frequency region, it is possible to perform an early start-up operation while coping with the liquid return to the compressor during the startup operation time. Therefore, a quick start-up operation can be realized without providing an accumulator or receiver and without causing a problem of liquid compression.
According to the third embodiment of the present invention, in the start-up control device for the heat pump hot water supply device according to the second embodiment, the operating frequency when the compressor is stable is set to the season, the incoming water temperature, the outside air temperature, or the user. A configuration that can be changed according to operating conditions such as temperature, a predetermined range of frequencies is stored as a frequency that can be operated in the second constant frequency region, and the operating frequency in the second constant frequency region is stored when the compressor is stable. The configuration can be changed according to the operating frequency. According to the present embodiment, the operation frequency in the second constant frequency region is changed according to the operation frequency when the compressor is stable, thereby realizing quick start-up operation while avoiding the problem of liquid compression more reliably. can do.
According to a fourth embodiment of the present invention, in the start-up control device for the heat pump hot water supply apparatus according to the third embodiment, the outside air temperature detecting means for detecting the outside air temperature, and the incoming water temperature detection for detecting the water temperature introduced into the radiator. Means, stable operation condition data storage means storing relational data between the outside air temperature and the incoming water temperature and the compressor operation frequency when stable, and a starting operation area condition data storage means storing condition data of the starting operation area A stable operating frequency determining means for determining a stable operating frequency from the detected values from the outside air temperature detecting means and the incoming water temperature detecting means and the condition data stored in the stable operating condition data storage means, and a stable operating frequency. The operation frequency in the second constant frequency range from the stable operation frequency determined by the determining means and the condition data stored in the starting operation area condition data storage means It is obtained by a starting operation area operation frequency determination means for determining. According to the present embodiment, in particular, the stable operation frequency is determined from the outside air temperature and the incoming water temperature, and the operation frequency in the second constant frequency region is determined based on the stable operation frequency. For example, even during winter operation where it takes time until the shell temperature rises, if the incoming water temperature is high, the frequency of the compressor will not rise unnecessarily, that is, without causing the problem of liquid compression. It can be carried out.
According to a fifth embodiment of the present invention, in the activation control device of the heat pump hot water supply apparatus according to the first to fourth embodiments, as a compressor, an intake refrigerant is introduced into a compression chamber, and a refrigerant discharged from the compression chamber is supplied. A high-pressure compressor that discharges into the shell is used. According to the present embodiment, the shell temperature can be increased early by using the high-pressure compressor, and the shell temperature can be increased compared to the low-pressure compressor even during normal operation. Compression problems can be avoided.
According to a sixth embodiment of the present invention, in the start-up control device for the heat pump water heater according to the first to fourth embodiments, the refrigerant in the compression chamber is discharged into the shell when the compression chamber of the compressor exceeds a predetermined pressure. A bypass mechanism is provided. According to the present embodiment, liquid compression can be avoided even when liquid refrigerant flows into the compression chamber for some reason.
The seventh embodiment of the present invention is the defrosting recovery executed at the time of switching from the defrosting operation to the hot water storage operation as the activation operation region in the activation control device of the heat pump water heater according to the first to fourth embodiments. The operation area is stored in advance, and in the defrost return operation area, the operation frequency is gradually increased from the constant frequency area at the time of return to maintain a predetermined frequency and from the operation frequency at the time of defrost operation to the predetermined frequency in the constant frequency area at the time of return. And a variable frequency region at the time of return to be reduced. According to the present embodiment, it is possible to cope with liquid return to the compressor at the time of switching from the defrosting operation to the hot water storage operation.
The eighth embodiment of the present invention uses carbon dioxide as the refrigerant in the activation control device for the heat pump hot water supply apparatus according to the first to fourth embodiments, and exceeds the critical pressure on the high pressure side of the heat pump circuit by the compressor. Driving in a state. Even a heat pump hot water supply apparatus such as the present embodiment using carbon dioxide as a refrigerant and having a very high pressure on the high pressure side can be operated without causing the problem of liquid compression.
The activation control method for the heat pump water heater according to the ninth embodiment of the present invention includes at least a first operation region and a second operation region that is executed after the first operation region as the activation operation region. The first operation region is stored in advance, and a first constant frequency region for maintaining a predetermined frequency and a first variable frequency region for gradually increasing the operation frequency to a predetermined frequency in the first constant frequency region are stored in the first operation region. The second operation region has a second constant frequency region for maintaining a predetermined frequency, and the operation frequency is gradually changed from a predetermined frequency in the first constant frequency region to a predetermined frequency in the second constant frequency region. A second variable frequency region for determining the operating frequency at the time of stability of the compressor from the outside air temperature detected by the outside air temperature detecting means and the incoming water temperature detected by the incoming water temperature detecting means. Is higher than the operating frequency of the second constant frequency region, the first variable frequency region, the first constant frequency region, the second variable frequency region, and the second constant frequency region; In order, and then starting control is performed by gradually or stepwise increasing the compressor operating frequency up to the stable operating frequency, and the determined stable operating frequency is in the second constant frequency region. When lower than the operation frequency, the first variable frequency region, the first constant frequency region, the second variable frequency region, and the second constant frequency region are operated in order, and then until the stable operation frequency Start-up control is performed by gradually or gradually decreasing the operating frequency of the compressor. Liquid compression after the shell temperature of the compressor has risen sufficiently can be avoided by optimizing the amount of refrigerant sealed in the heat pump circuit, but during startup operation time when the shell temperature has not risen sufficiently A large amount of liquid refrigerant flows into the compressor. The liquid return to the compressor during the startup operation time occurs immediately after startup and after a predetermined time has elapsed. According to the present embodiment, at least the first operation region and the second operation region that is executed after the first operation region are stored in advance as the start operation region, and the first constant frequency region and By providing the second constant frequency region, the liquid return to the compressor immediately after startup avoids problems due to liquid compression by the first constant frequency region, and the liquid to the compressor after a predetermined time has elapsed. For the return, avoiding the problem due to the liquid compression by the second constant frequency region, it is possible to perform an early start-up operation while coping with the liquid return to the compressor during the startup operation time. In addition, according to the present embodiment, in order to determine the operating frequency at the time of particularly stable from the outside air temperature and the incoming water temperature, and to determine the operating frequency in the second constant frequency region based on the operating frequency at the time of stable. For example, even during winter operation where it takes time until the shell temperature rises, if the incoming water temperature is high, the frequency of the compressor does not rise unnecessarily, that is, without causing the problem of liquid compression. It can be performed.
The activation control method for a heat pump water heater according to the tenth embodiment of the present invention includes at least a first operation region and a second operation region that is executed after the first operation region as a start operation region. The first operation region is stored in advance, and a first constant frequency region for maintaining a predetermined frequency and a first variable frequency region for gradually increasing the operation frequency to a predetermined frequency in the first constant frequency region are stored in the first operation region. The second operation region has a second constant frequency region for maintaining a predetermined frequency, and the operation frequency is gradually changed from a predetermined frequency in the first constant frequency region to a predetermined frequency in the second constant frequency region. A second variable frequency region, a frequency within a predetermined range is stored as an operable frequency in the second constant frequency region, and the outside air temperature detected by the outside air temperature detecting unit and the incoming water temperature detecting unit The stable operation frequency of the compressor is determined from the incoming water temperature, and when the determined stable operation frequency is higher than the maximum frequency of the second constant frequency region, the second constant frequency region The first variable frequency region, the first constant frequency region, the second variable frequency region, and the second constant frequency region are sequentially operated until the operation frequency at the stable time When the start-up control is performed by gradually or stepwise increasing the operating frequency of the compressor, and the determined operating frequency at the time of stability is a frequency in a predetermined range of the second constant frequency region, The operation frequency in the constant frequency region is set as the stable operation frequency, and the first variable frequency region, the first constant frequency region, the second variable frequency region, and the second constant frequency region are sequentially operated. Start control with When the stable operation frequency is lower than the minimum frequency in the second constant frequency region, the operation frequency in the second constant frequency region is set to the minimum frequency, and the first variable frequency region and the first constant frequency region are set. The start-up control is performed by sequentially operating the frequency region, the second variable frequency region, and the second constant frequency region, and then gradually or stepwise decreasing the compressor operation frequency to the stable operation frequency. Is. Liquid compression after the shell temperature of the compressor has risen sufficiently can be avoided by optimizing the amount of refrigerant sealed in the heat pump circuit, but during startup operation time when the shell temperature has not risen sufficiently A large amount of liquid refrigerant flows into the compressor. The liquid return to the compressor during the startup operation time occurs immediately after startup and after a predetermined time has elapsed. According to the present embodiment, at least the first operation region and the second operation region that is executed after the first operation region are stored in advance as the start operation region, and the first constant frequency region and By providing the second constant frequency region, the liquid return to the compressor immediately after startup avoids problems due to liquid compression by the first constant frequency region, and the liquid to the compressor after a predetermined time has elapsed. For the return, avoiding the problem due to the liquid compression by the second constant frequency region, it is possible to perform an early start-up operation while coping with the liquid return to the compressor during the startup operation time. In addition, according to the present embodiment, in order to determine the operating frequency at the time of particularly stable from the outside air temperature and the incoming water temperature, and to determine the operating frequency in the second constant frequency region based on the operating frequency at the time of stable. For example, even during winter operation where it takes time until the shell temperature rises, if the incoming water temperature is high, the frequency of the compressor does not rise unnecessarily, that is, without causing the problem of liquid compression. It can be performed. Furthermore, according to the present embodiment, the operation frequency in the second constant frequency region is changed according to the operation frequency when the compressor is stable, so that the quick start-up operation can be performed more reliably while avoiding the problem of liquid compression. Can be realized.
The eleventh embodiment of the present invention is the defrosting return executed at the time of switching from the defrosting operation to the hot water storage operation as the activation operation region in the activation control method of the heat pump water heater according to the ninth or tenth embodiment. The operation area is stored in advance, and in the defrost return operation area, the operation frequency is gradually increased from the constant frequency area at the time of return to maintain a predetermined frequency and from the operation frequency at the time of defrost operation to the predetermined frequency in the constant frequency area at the time of return. When the defrosting completion detecting means detects the defrosting completion, the variable frequency area at the time of restoration and the constant frequency area at the time of restoration are operated in order. During operation in the constant frequency range of time, the expansion valve is throttled to switch to hot water storage operation, and then switching control is performed by gradually or stepwise increasing the compressor operation frequency to the stable operation frequency. It is intended. According to the present embodiment, it is possible to cope with liquid return to the compressor at the time of switching from the defrosting operation to the hot water storage operation.
In a twelfth embodiment of the present invention, in the activation control method for a heat pump water heater according to the ninth or tenth embodiment, carbon dioxide is used as a refrigerant, and a critical pressure is set on the high pressure side of the heat pump circuit by a compressor. It is to drive in the state of exceeding. Even a heat pump hot water supply apparatus such as the present embodiment using carbon dioxide as a refrigerant and having a very high pressure on the high pressure side can be operated without causing the problem of liquid compression.

Hereinafter, a start control device and a start control method of a heat pump water heater in one embodiment of the present invention will be described.
FIG. 1 is a circuit configuration diagram of the heat pump water heater according to the present embodiment. The heat pump hot water supply apparatus according to this embodiment includes a heat pump circuit and a hot water storage circuit. The heat pump circuit is configured by connecting a compressor 1, a radiator 2, an expansion valve 3, and an evaporator 4 in order with refrigerant piping. The fan 5 is provided at a position facing the evaporator 4.
Here, it is preferable that the heat pump circuit is operated in a state where carbon dioxide is used as a refrigerant and the high pressure side exceeds the critical pressure. The compressor 1 is preferably a high-pressure compressor that introduces refrigerant into the compression chamber and discharges refrigerant discharged from the compression chamber into the shell. Further, it is preferable to provide a bypass mechanism that discharges the refrigerant in the compression chamber into the shell when the compression chamber of the compressor 1 exceeds a predetermined pressure. This bypass mechanism may be constituted by a through hole that opens a sealed space especially in the high pressure side space of the compression chamber, and a differential pressure valve that normally closes the through hole and opens when the compression chamber exceeds a predetermined pressure. it can.
The hot water storage circuit is configured by sequentially connecting a hot water storage tank 6, a circulation pump 7, and a radiator 2 with water pipes. Note that a three-way valve 8 is provided in the outlet-side water pipe of the radiator 2, and a water pipe 9A is connected to one outlet connection port of the three-way valve 8, and a water pipe 9B is connected to the other outlet connection port. The water pipe 9 </ b> A is connected to the upper part of the hot water storage tank 6, and the water pipe 9 </ b> B is connected to the lower part of the hot water storage tank 6. As the hot water storage tank 6, a stacked hot water storage tank in which high temperature water is separated in the upper part and low temperature water is separated and stored in the lower part is used. Further, the radiator 2 is configured such that the refrigerant and the water flow opposite to each other.

The outlet pipe of the evaporator 4 is provided with an evaporator outlet temperature detecting means (defrosting completion detecting means) 10 for detecting the end of the defrosting operation, and is introduced into the radiator 2 upstream of the circulation pump 7. An incoming water temperature detecting means 11 for detecting the water temperature to be detected is provided, and an outside air temperature detecting means 12 for detecting the outside air temperature is provided in the vicinity of the fan 5.
Although not shown, the hot water storage tank 6 has a hot water supply pipe connected to the upper part and a lower part connected to a water supply pipe. The hot water supply pipe is a faucet for a bathtub, washbasin, kitchen, etc. It is connected to the heat source side piping of the heat exchanger for reheating. When connected to the heat source side pipe of the heat exchanger for heating or reheating, a return pipe is connected to the lower part of the hot water storage tank 6.

Next, the basic operation of the heat pump hot water supply apparatus according to this embodiment will be described.
The heat pump circuit is operated by the hot water storage operation signal, the refrigerant is compressed by the compressor 1, the high-temperature and high-pressure refrigerant is cooled by the radiator 2, depressurized by the expansion valve 3, and then absorbs heat from the atmosphere by the evaporator 4. Then, it evaporates and returns to the compressor 1. On the other hand, water is supplied from the lower part of the hot water storage tank 6 to the radiator 2 by the circulation pump 7, and the supplied water is heated by the radiator 2. The heated hot water flows from the upper portion of the hot water storage tank 6 through the three-way valve 8 and the water pipe 9A. Accordingly, the hot water is sequentially stored from the upper part of the hot water storage tank 6.
In addition, when the hot water temperature in the exit piping of the radiator 2 is low like the starting operation time and the defrosting operation time of the compressor 1, the outlet side connection port of the three-way valve 8 is switched to the water piping 9B side. This prevents the low temperature water from being supplied from the upper part of the hot water storage tank 6. In addition, it is preferable to switch the three-way valve 8 by a temperature detection means for detecting the outlet side hot water temperature of the radiator 2.

Below, the structure of the starting control apparatus of the heat pump hot-water supply apparatus in a present Example is demonstrated.
FIG. 2 is a block diagram showing the configuration of the activation control device of the heat pump hot-water supply device according to the present embodiment using function realizing means.
The first storage means 13 stores the stable operation condition data storage means 14 that stores the relationship data between the outside air temperature and the incoming water temperature and the stable operation frequency of the compressor 1, and the condition data of the startup operation area. And a starting operation area condition data storage means 15.
The startup operation region condition data storage means 15 includes a first operation region, a second operation region that is executed after the first operation region, and a third operation region that is executed after the second operation region. And a defrost return operation region that is executed when switching from the defrost operation to the hot water storage operation is stored in advance.

The first operating region has a first constant frequency region that maintains a predetermined frequency, and a first variable frequency region that gradually increases the operating frequency to a predetermined frequency in the first constant frequency region. . Here, the first constant frequency region stores, for example, 48 Hz which is a predetermined frequency as an operation frequency that does not cause a problem due to liquid compression. The first variable frequency region stores a plurality of operating frequencies between 0 Hz and 48 Hz as operating frequencies and 45 seconds as a predetermined time as operating time. Moreover, 2 minutes which are predetermined time is memorize | stored as the whole time of a 1st driving | operation area | region.
In the second operation region, the operation frequency is gradually changed from a second constant frequency region that maintains a predetermined frequency and a predetermined frequency in the first constant frequency region to a predetermined frequency in the second constant frequency region. And a second variable frequency region. Here, the second constant frequency region stores, for example, a maximum frequency of 58 Hz to a minimum frequency of 44 Hz as a predetermined range of frequencies that do not cause a problem due to liquid compression. The second variable frequency region stores a frequency between 48 Hz and the second constant frequency divided into a plurality of instructions and sequentially stores 30 seconds as a predetermined time as an operation time. Also, 2 minutes, which is a predetermined time, is stored as the entire time of the second operation region.
Further, in the third operation region, the operation frequency is gradually changed from the third constant frequency region that maintains the predetermined frequency and the predetermined frequency in the second constant frequency region to the predetermined frequency in the third constant frequency region. And a third variable frequency region. Here, the third constant frequency region stores, for example, a maximum frequency of 72 Hz to a minimum frequency of 40 Hz as an operation frequency that does not cause a problem due to liquid compression. In addition, the third variable frequency region stores a frequency between the second constant frequency and the third constant frequency by dividing the frequency into a plurality of instructions and sequentially storing 30 seconds as a predetermined time as an operation time. . In addition, 2 minutes, which is a predetermined time, is stored as the total time of the third operation region.
In addition, the defrost return operation region includes a constant frequency region at the time of return that maintains a predetermined frequency, and a return time that gradually decreases the operation frequency from the operation frequency at the time of defrost operation to a predetermined frequency in the constant frequency region at the time of return. Variable frequency region. Here, the constant frequency region at the time of return stores, for example, 56 Hz which is a predetermined frequency as an operation frequency that does not cause a problem due to liquid compression. The variable frequency region at the time of return stores a plurality of operation frequencies that are time-divided between 80 Hz that is the operation frequency at the end of the defrosting operation and 56 Hz that is the predetermined frequency as the operation frequency. Further, 90 seconds, which is a predetermined time, and 30 seconds, which is a predetermined time from completion of defrosting to hot water storage operation switching, are stored as the total time of the operation region at the time of return.

The second storage unit 16 includes a stable operation frequency storage unit 17 that stores the determined stable operation frequency, and a startup operation region operation frequency storage unit 18.
The stable operation frequency determination means 19 determines the stable operation frequency from the detected values from the outside air temperature detection means 12 and the incoming water temperature detection means 11 and the condition data stored in the stable operation condition data storage means 14. The result is stored in the stable operation frequency storage means 17.
In the starting operation region operating frequency determining means 20, the second constant frequency region or the second constant frequency region or the condition data stored in the starting operation region condition data storing means 15 is stored in the stable operation frequency storing means 17. The operation frequency in the third constant frequency region is determined, and the result is stored in the start operation region operation frequency storage means 18.
The compressor operation instruction means 21 reads out necessary data from the stable operation frequency storage means 17, the start operation area operation frequency storage means 18, and the start operation area condition data storage means 15 in accordance with the operation timing, and sends it to the compressor 1. In response, an operation command is output.
The data read from the start operation area condition data storage means 15 to the compressor operation instruction means 21 is condition data relating to the defrost return operation area executed when switching from the defrost operation to the hot water storage operation, and the defrost completion detection is performed. A signal from the means 10 is read as a trigger.

Next, an activation control method for the heat pump water heater in the present embodiment will be described.
FIG. 3 is a flowchart showing a start-up control method for the heat pump water heater according to this embodiment.
First, the outside air temperature and the incoming water temperature are detected at the start of operation (steps 1 and 2).
Then, a stable operation frequency (FN) of the compressor 1 is determined from the outside air temperature detected by the outside air temperature detecting means 12 and the incoming water temperature detected by the incoming water temperature detecting means 11 (step 3). In determining the stable operation frequency (FN), the condition data stored in the stable operation condition data storage means 14 is used. The determined stable operation frequency (FN) is stored in the stable operation frequency storage means 17.

Next, the operation frequency of the second constant frequency region stored in the startup operation region condition data storage unit 15 is determined.
In step 4, it is determined whether or not the stable operation frequency (FN) is higher than the maximum frequency 58 Hz (F2H) in the second constant frequency region. When the stable operation frequency (FN) is larger than the maximum frequency (F2H) in the second constant frequency region, the maximum frequency (F2H) is determined as the operation frequency in the second constant frequency region (step) 5). When the stable operation frequency (FN) is equal to or lower than the maximum frequency (F2H) in the second constant frequency region, in step 6, the stable operation is performed at a frequency lower than the minimum frequency 44 Hz (F2L) in the second constant frequency region. It is determined whether the frequency (FN) is small. In step 6, when the stable operation frequency (FN) is smaller than the minimum frequency 44 Hz (F2L) in the second constant frequency region, the minimum frequency (F2L) is set as the operation frequency in the second constant frequency region. Determined (step 7). When the stable operation frequency (FN) is not less than the minimum frequency (F2L) of the second constant frequency region and not more than the maximum frequency (F2H) of the second constant frequency region, the second constant frequency is determined in step 8. The stable operation frequency (FN) is determined as the region operation frequency (F2).

Next, the operation frequency of the third constant frequency region stored in the startup operation region condition data storage unit 15 is determined.
If the stable operation frequency (FN) is larger than the maximum frequency (F2H) in the second constant frequency region, in step 9, the stable frequency is higher than the maximum frequency 72 Hz (F3H) in the third constant frequency region. It is determined whether the operating frequency (FN) is high. When the stable operation frequency (FN) is larger than the maximum frequency (F3H) of the third constant frequency region, the maximum frequency (F3H) is determined as the operation frequency of the third constant frequency region (step) 10). When the stable operation frequency (FN) is equal to or less than the maximum frequency (F3H) in the third constant frequency region, in step 11, the stable operation frequency (F3) is set as the third constant frequency region operation frequency (F3). FN) is determined. When a new operation frequency (FN, F2, F3) is determined, a new operation frequency (FN) is stored in place of the previous operation frequency (FN, F2, F3) each time.

FIG. 4 is a graphical representation of the activation control method for the heat pump water heater according to the present embodiment described with reference to FIG.
FIG. 4 is a characteristic diagram in which the time from the start of the heat pump water heater according to the present embodiment is plotted on the horizontal axis and the operating frequency of the compressor is plotted on the vertical axis.
The first operation region (variable frequency region and constant frequency region) operates at a preset frequency (48 Hz) regardless of the outside air temperature and the incoming water temperature.
In the constant frequency region of the second operation region, a range of 44 Hz to 58 Hz is preset as an operable frequency, and when the determined stable operation frequency is higher than 58 Hz, the operation is performed at 58 Hz, and the determined stability When the operation frequency at the time is lower than 58 Hz, the operation is performed at the stable operation frequency. However, the minimum frequency is set to 44 Hz.
In the constant frequency region of the third operation region, the range of 40 Hz to 72 Hz is set in advance as the operable frequency, and when the determined stable operation frequency is higher than 72 Hz, the operation is performed at 72 Hz and the determined stability is determined. When the operation frequency is lower than 72 Hz, the operation is performed at the stable operation frequency. However, the minimum frequency is set to 40 Hz.
It is preferable that the operation frequency when the compressor is stable can be changed according to operation conditions such as a season or a user's set temperature, in addition to the case where the operation frequency is changed according to the incoming water temperature and the outside air temperature.

Next, one experimental data of the activation control method for the heat pump water heater according to the present embodiment will be described. FIG. 5 is a characteristic diagram showing changes in compressor operating frequency at start-up at a low winter water temperature, FIG. 6 is a characteristic diagram showing changes in compressor operating frequency at start-up at a high winter water temperature, and FIG. 7 is winter. FIG. 8 is a characteristic diagram showing a compressor liquid back and suction superheat degree after starting winter operation, FIG. 9 is a characteristic diagram showing a change in compressor shell temperature at the start of winter operation, FIG. Is a characteristic diagram showing changes in compressor operating frequency at start-up at summer low water inlet temperature, FIG. 11 is a characteristic diagram showing change in compressor operating frequency at start-up at summer high water inlet temperature, and FIG. 12 is summer operation start-up. It is a characteristic view which shows the back compressor liquid back | bag and suction | inhalation superheat degree.
The experimental data shown in FIGS. 5 to 12 will be described below.

FIG. 5 shows a case where the incoming water temperature is raised to 9 ° C. and the hot water temperature is raised to 90 ° C. The initial operation starts at 48 Hz, and in order to obtain a predetermined temperature of 90 ° C., the operation frequency is stabilized at 72 Hz. Increase frequency. The frequency of 72 Hz is set in advance from the incoming water temperature and the outside air temperature in order to ensure a predetermined heating capacity when stable. FIG. 6 shows a case where the incoming water temperature is 45 ° C. and the hot water temperature is 90 ° C. In this case, the initial operation starts at 48 Hz, but the stable operating frequency is 40 Hz. The operating frequency has been lowered.
FIG. 7 shows the heating capacity and the hot water temperature change after the start in winter, and when the frequency reaches 72 Hz, the hot water temperature and the heating capacity are not yet stabilized and have not reached the predetermined values.
FIG. 8 shows the state of the refrigerant flowing into the compressor after winter start-up. Both cold start and hot start are backed up for approximately 1 minute immediately after start-up, and at that time, operation is performed at a low frequency of 48 Hz. And the gasified refrigerant | coolant suck | inhales to a compressor for 1 to 7 minutes at the time of cold start. Furthermore, although the liquid is back after 7 minutes, as shown in FIG. 9, the compressor shell temperature has risen to 50 to 60 ° C., so the operation is performed at a high frequency. On the other hand, the liquid is constantly backed up at the time of start-up when heated, but because the compressor shell temperature is high, abnormal liquid compression does not occur.
FIGS. 10 to 12 show summer data and correspond to FIGS. 5, 6, and 8.

13 and 14 are characteristic diagrams showing changes in the drive frequency of the compressor when the defrosting operation is switched to the hot water storage operation.
In the case of this embodiment, since the compressor shell temperature is relatively high at the end of defrosting, the operating frequency at the time of switching to hot water storage operation is operated at 56 Hz for 1 minute and then increased to 78 Hz.
When detecting that the refrigerant temperature at the evaporator outlet has reached 6 ° C. during the defrosting operation, the operation frequency of the compressor is lowered to 56 Hz. That is, when the frost adhering to the evaporator is defrosted, the heat of the refrigerant taken away by the defrosting is reduced, so that the refrigerant temperature at the evaporator outlet rises from 0 ° C. to 6 ° C. of superheated gas. The temperature change is detected, it is determined that the defrosting is completed, and the operation frequency is temporarily lowered to 56 Hz in order to shift to the hot water storage operation, and then the hot water storage operation is started.
As for the stable operation frequency of 78 Hz, the outside air temperature and the incoming water temperature are detected in the same manner as in the previous startup control, and the compressor is operated at the stable operation frequency determined based on the detected temperature.

  As described above, according to the present embodiment, rapid liquid return can be prevented by starting up the compressor by lowering the drive frequency at the start of operation. In particular, by starting at a low frequency when the compressor is cold, it is possible to prevent seizure of the compressor mechanism and abnormal liquid compression. If the compressor shell temperature rises to some extent, the operation frequency is increased. If there is a liquid return when the compressor shell temperature is high, heat is received from the mechanical part of the compressor and the dryness of the refrigerant increases, or the refrigerant is vaporized, so that abnormal liquid compression can be prevented. In particular, these effects can be remarkably obtained by using a high-pressure compressor.

  The heat pump water heater according to the present invention is useful as a hot water heater with a reheating function for supplying hot water to a bath tub in a general home. In addition to the reheating function of the bathtub or in place of the reheating function of the bathtub, floor heating, etc. It can be used as a water heater with a heating function.

Circuit configuration diagram of heat pump water heater according to this embodiment The block diagram which represented the structure of the starting control apparatus of the heat pump hot-water supply apparatus by a present Example with the function implementation means The flowchart showing the activation control method of the heat pump water heater according to the present embodiment Characteristic diagram showing time from start of heat pump water heater according to the present embodiment on the horizontal axis and operating frequency of the compressor on the vertical axis Characteristic chart showing changes in compressor operating frequency at start-up at low water temperature in winter Characteristic chart showing changes in compressor operating frequency at start-up at high water inlet temperature in winter Start-up characteristics at low water temperature in winter Characteristic chart showing compressor liquid back and suction superheat degree after start of winter operation Characteristic chart showing compressor shell temperature change at start of winter operation Characteristic chart showing changes in compressor operating frequency at start-up at low water temperature in summer Characteristic chart showing change in compressor operating frequency at start-up at high water temperature in summer Characteristic chart showing compressor liquid back and suction superheat after start of summer operation Characteristic chart showing changes in compressor drive frequency when switching from defrosting operation to hot water storage operation Characteristic chart showing changes in compressor shell temperature when switching from defrosting operation to hot water storage operation

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Radiator 3 Expansion valve 4 Evaporator 6 Hot water storage tank

Claims (12)

  A heat pump circuit having a compressor and a radiator; and a hot water storage circuit for storing hot water heated by the radiator in a hot water storage tank. The heat pump circuit does not include a receiver and an accumulator, and the number of revolutions as the compressor. A variable compressor is used, frequency control is performed in a start-up operation region from the start-up to the stable time of the compressor, and at least one constant frequency region that maintains a predetermined frequency in the start-up operation region is provided. Start-up control device for heat pump water heater. A heat pump circuit having a compressor and a radiator; and a hot water storage circuit for storing hot water heated by the radiator in a hot water storage tank. The heat pump circuit does not include a receiver and an accumulator, and the number of revolutions as the compressor. Using a variable compressor, a start-up control device for a heat pump water heater that performs frequency control in the start-up operation region from the start-up time to the stable time of the compressor,
As the start-up operation region, at least a first operation region and a second operation region that is executed after the first operation region are stored in advance,
The first operation region includes a first constant frequency region that maintains a predetermined frequency, and a first variable frequency region that gradually increases the operation frequency to the predetermined frequency of the first constant frequency region. ,
The second operation region includes a second constant frequency region that maintains a predetermined frequency, and gradually changes the operation frequency from a predetermined frequency in the first constant frequency region to a predetermined frequency in the second constant frequency region. A start-up control device for a heat pump hot-water supply device. The stable operation frequency of the compressor is configured to be changeable according to operation conditions such as season, incoming water temperature, outside air temperature, or user set temperature,
Storing a predetermined range of frequencies as operable frequencies in the second constant frequency region;
The start-up control device for a heat pump hot-water supply device according to claim 2, wherein the operation frequency in the second constant frequency region can be changed according to the operation frequency when the compressor is stable. Outside temperature detecting means for detecting outside temperature;
Incoming water temperature detecting means for detecting the water temperature introduced into the radiator,
Stable operation condition data storage means storing relational data between the outside air temperature and the incoming water temperature and the stable operation frequency of the compressor;
A starting operation region condition data storage means for storing condition data of the starting operation region;
A stable operating frequency determining means for determining a stable operating frequency from the detected value from the outside air temperature detecting means and the incoming water temperature detecting means and the condition data stored in the stable operating condition data storage means;
A start-up operation region in which the operation frequency in the second constant frequency region is determined from the stable operation frequency determined by the stable-time operation frequency determining unit and the condition data stored in the start-up operation region condition data storage unit. The start-up control device for a heat pump hot-water supply device according to claim 3, further comprising an operating frequency determining means.   5. The high-pressure compressor according to claim 1, wherein a high-pressure compressor that introduces suction refrigerant into the compression chamber and discharges refrigerant discharged from the compression chamber into the shell is used as the compressor. Start-up control device for heat pump water heater.   The heat pump hot water supply device according to any one of claims 1 to 4, further comprising a bypass mechanism that discharges refrigerant in the compression chamber into the shell when a pressure in the compression chamber of the compressor exceeds a predetermined pressure. Start control device. In the start control device of the heat pump hot water supply device that performs switching control from the defrosting operation in which the expansion valve is opened to defrost the evaporator to the hot water storage operation in which the hot water heated by the radiator is stored in the hot water storage tank,
As the start-up operation area, previously stored a defrost return operation area that is executed when switching from the defrost operation to the hot water storage operation,
The defrost return operation region includes a constant frequency region at the time of return that maintains a predetermined frequency, and a return that gradually decreases the operation frequency from the operation frequency at the time of the defrost operation to a predetermined frequency in the constant frequency region at the time of return. The start-up control device for a heat pump hot-water supply device according to any one of claims 1 to 4, wherein the start-up control device has a variable frequency region at the time.   The start control of the heat pump water heater according to any one of claims 1 to 4, wherein carbon dioxide is used as a refrigerant, and the compressor is operated in a state exceeding a critical pressure on a high pressure side of the heat pump circuit. apparatus. A heat pump circuit having a compressor and a radiator; a hot water storage circuit for storing hot water heated by the radiator in a hot water storage tank; an outside air temperature detecting means for detecting an outside air temperature; and a water temperature to be introduced into the radiator. A heat pump water heater start-up control method for controlling the frequency in the start-up operation time from the start-up time of the compressor to a stable time using a compressor having a variable rotation speed as the compressor. ,
As the start-up operation region, at least a first operation region and a second operation region that is executed after the first operation region are stored in advance,
The first operation region includes a first constant frequency region that maintains a predetermined frequency, and a first variable frequency region that gradually increases the operation frequency to the predetermined frequency of the first constant frequency region. ,
The second operation region includes a second constant frequency region that maintains a predetermined frequency, and gradually changes the operation frequency from a predetermined frequency in the first constant frequency region to a predetermined frequency in the second constant frequency region. A second variable frequency region to be
Determine the operating frequency at the time of stability of the compressor from the outside air temperature detected by the outside air temperature detecting means and the incoming water temperature detected by the incoming water temperature detecting means,
When the determined operation frequency at the time of stability is higher than the operation frequency in the second constant frequency region, the first variable frequency region, the first constant frequency region, and the second variable frequency Region, and the second constant frequency region in order, and then starting control by gradually or stepwise increasing the operating frequency of the compressor until the stable operating frequency,
When the determined operation frequency at the time of stability is lower than the operation frequency in the second constant frequency region, the first variable frequency region, the first constant frequency region, and the second variable frequency And a second constant frequency region in order, and then starting control is performed by gradually or stepwise decreasing the operating frequency of the compressor to a stable operating frequency. Start-up control method for hot water supply device. A heat pump circuit having a compressor and a radiator; a hot water storage circuit for storing hot water heated by the radiator in a hot water storage tank; an outside air temperature detecting means for detecting an outside air temperature; and a water temperature to be introduced into the radiator. A heat pump water heater start-up control method for controlling the frequency in the start-up operation time from the start-up time of the compressor to a stable time using a compressor having a variable rotation speed as the compressor. ,
As the start-up operation region, at least a first operation region and a second operation region that is executed after the first operation region are stored in advance,
The first operation region includes a first constant frequency region that maintains a predetermined frequency, and a first variable frequency region that gradually increases the operation frequency to the predetermined frequency of the first constant frequency region. ,
The second operation region includes a second constant frequency region that maintains a predetermined frequency, and gradually changes the operation frequency from a predetermined frequency in the first constant frequency region to a predetermined frequency in the second constant frequency region. A second variable frequency region to be
Storing a predetermined range of frequencies as operable frequencies in the second constant frequency region;
Determine the operating frequency at the time of stability of the compressor from the outside air temperature detected by the outside air temperature detecting means and the incoming water temperature detected by the incoming water temperature detecting means,
When the determined operation frequency at the time of stability is higher than the maximum frequency in the second constant frequency region, the operation frequency in the second constant frequency region is set as the maximum frequency, and the first variable The frequency region, the first constant frequency region, the second variable frequency region, and the second constant frequency region are operated in order, and thereafter the operation frequency of the compressor is gradually or until the stable operation frequency. Start control by increasing in stages,
When the determined operation frequency at the time of stability is a frequency in a predetermined range of the second constant frequency region, the operation frequency in the second constant frequency region is set as the operation frequency at the time of stabilization, and The start control is performed by sequentially operating the first variable frequency region, the first constant frequency region, the second variable frequency region, and the second constant frequency region,
When the determined operation frequency at the time of stability is lower than the minimum frequency in the second constant frequency region, the operation frequency in the second constant frequency region is set as the minimum frequency, and the first variable The frequency region, the first constant frequency region, the second variable frequency region, and the second constant frequency region are operated in order, and thereafter the operation frequency of the compressor is gradually or until the stable operation frequency. A start-up control method for a heat pump water heater, wherein start-up control is performed by decreasing stepwise. Hot water storage that has defrosting completion detection means for detecting the end of the defrosting operation, and stores hot water heated by the radiator in the hot water storage tank from the defrosting operation that opens the expansion valve to defrost the evaporator In switching control to operation,
As the start-up operation area, previously stored a defrost return operation area that is executed when switching from the defrost operation to the hot water storage operation,
The defrost return operation region includes a constant frequency region at the time of return that maintains a predetermined frequency, and a return that gradually decreases the operation frequency from the operation frequency at the time of the defrost operation to a predetermined frequency in the constant frequency region at the time of return. Variable frequency region of time,
When defrosting completion is detected from the defrosting completion detecting means, the variable frequency region at the time of return and the constant frequency region at the time of return are sequentially operated, and during operation in the constant frequency region at the time of return The switching control is performed by gradually or stepwise increasing the operation frequency of the compressor until the operation frequency is stabilized after the expansion valve is throttled to the stable operation frequency. The start-up control method of the heat pump hot-water supply apparatus of Claim 10. The start-up control method for a heat pump water heater according to claim 9 or 10, wherein carbon dioxide is used as a refrigerant, and the compressor is operated in a state exceeding a critical pressure on a high pressure side of the heat pump circuit.

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