JP2013242077A - Heat pump hot-water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump hot-water heater capable of heating operation without trouble, even if frost adheres to an evaporator.SOLUTION: A heat pump hot-water heater includes: a refrigerant circuit comprising a compressor 1, a water-refrigerant heat exchanger 2, a pressure reducer 3, and an air heat exchanger 4; a water circuit for connecting the water-refrigerant heat exchanger 2 with a heating terminal 16 through a hot water outgoing pipe 14 and a hot water return pipe 11; and a control unit 40. The control unit 40 is configured to store that a defrosting operation for melting the frost adhering to the air heat exchanger 4 has been performed for a predetermined time that is pre-set, and to reduce an operation hour of the defrosting operation performed thereafter when storing that the defrosting operation has been performed. By this arrangement, the heat pump hot-water heater is capable of heating operation without trouble, even if the frost adheres to an evaporator.

Description

  The present invention relates to defrosting of a heat pump type hot water heater.

  Conventionally, the defrosting means in this type of air conditioner has a flow as shown in FIG.

  In general, during the heating operation of the air heat exchanger of the air conditioner, the evaporator becomes an evaporator, and the refrigerant absorbs heat from the atmosphere, so that the evaporator temperature becomes low. Therefore, when the outside air temperature is low (for example, 2 ° C. to 5 ° C. or less), the temperature of the evaporator becomes zero or less, and when moisture is present, it becomes frost and adheres to the evaporator.

  If the operation is continued after frost adherence, the frost grows further and the heat exchange capacity in the evaporator is inhibited, and the heating capacity is gradually reduced. To prevent frost growth.

  In the defrosting operation when the amount of frost adhering to the evaporator and the outside air temperature is very low, it takes a long time to completely melt the frost adhering to the evaporator. It is a general defrosting means to end the defrosting operation and switch to the heating operation even if some frost remains when the defrosting operation has passed a predetermined time. Yes (see, for example, Patent Document 1).

JP-A-11-83117

  However, in the defrosting means in the air conditioner described in Patent Document 1, the defrosting operation is determined in advance in a state where the amount of frost adhering to the evaporator immediately before entering the defrosting operation or the outside air temperature is very low. After a long period of time, when the operation is switched to heating operation, the frost that has adhered to the evaporator is not fully melted, so that the frost grows and the heat exchange capacity of the evaporator is reduced. This hinders the remarkable decrease in heating capacity, and as a worst condition, the entire air heat exchanger is frozen, resulting in a problem that heating operation cannot be performed normally.

  The present invention has been made in view of such problems of the prior art, and provides a heat pump hot water heater that can perform heating operation without hindrance even if frost adheres to the evaporator. Objective.

  In order to solve the above problems, a heat pump hot water heater of the present invention includes a refrigerant circuit including a compressor, a water-refrigerant heat exchanger, a decompressor, and an air heat exchanger, the water-refrigerant heat exchanger, and a heating terminal. Are connected to each other through a hot water return pipe and a hot water return pipe, and a control device, and the control device has a predetermined defrosting operation for melting frost adhering to the air heat exchanger. In addition to storing that the defrosting operation has been performed, the operation time of the defrosting operation performed after that is shortened.

  This prevents frost growth at the end of defrosting and prevents frost growth in the air heat exchanger, which is an evaporator, obstruction of heat exchange capacity, and significant decrease in heating capacity when the operation moves to heating operation. Can do.

  The heat pump hot water heater according to the present invention includes a refrigerant circuit including a compressor, a water-refrigerant heat exchanger, a decompressor, and an air heat exchanger, and the water-refrigerant heat exchanger and the heating terminal. A water circuit connected via a pipe and a hot water return pipe, a control device, and a temperature sensor for detecting the temperature of the air heat exchanger, the control device melts frost adhering to the air heat exchanger The defrosting operation to be performed is stored for a predetermined time, and the start of the defrosting operation is determined based on the temperature detected by the temperature sensor, and the defrosting operation is stored. In such a case, the operation start temperature of the defrosting operation performed thereafter is increased.

  This prevents frost growth at the end of defrosting and prevents frost growth in the air heat exchanger, which is an evaporator, obstruction of heat exchange capacity, and significant decrease in heating capacity when the operation moves to heating operation. Can do.

  ADVANTAGE OF THE INVENTION According to this invention, even if frost adheres to an evaporator, the heat pump type hot water heater which can perform heating operation without trouble can be provided.

The block diagram of the heat pump type hot water heater in Embodiment 1 of this invention Control block diagram of the heat pump hot water heater Operation flow chart for heating operation of the heat pump type hot water heater Other operation flowchart at the time of heating operation of the heat pump type hot water heater Operation flow chart during heating operation of a conventional heat pump hot water heater

  The first invention is a refrigerant circuit comprising a compressor, a water-refrigerant heat exchanger, a decompressor, an air heat exchanger, the water-refrigerant heat exchanger and a heating terminal, and a hot water return pipe and a hot water return pipe. A water circuit connected to the air heat exchanger, and the control device stores that the defrosting operation for melting the frost adhering to the air heat exchanger has been performed for a predetermined time period. When it is memorized that the frost operation has been performed, the heat pump type hot water heater is characterized in that the operation time of the defrost operation performed thereafter is shortened.

  This prevents frost growth at the end of defrosting and prevents frost growth in the air heat exchanger, which is an evaporator, obstruction of heat exchange capacity, and significant decrease in heating capacity when the operation moves to heating operation. Can do.

  According to a second aspect of the present invention, a refrigerant circuit including a compressor, a water-refrigerant heat exchanger, a decompressor, and an air heat exchanger, the water-refrigerant heat exchanger and a heating terminal are connected to a hot water return pipe and a hot water return pipe. A control circuit and a temperature sensor that detects the temperature of the air heat exchanger, and the control device performs a defrosting operation for melting frost attached to the air heat exchanger in advance. When it is memorized that the defrosting operation has been carried out while memorizing that the defrosting operation has been performed at the temperature detected by the temperature sensor, It is a heat pump type hot water heater characterized by raising the operation start temperature of the defrosting operation performed in the above.

This prevents frost growth at the end of defrosting and prevents frost growth in the air heat exchanger, which is an evaporator, obstruction of heat exchange capacity, and significant decrease in heating capacity when the operation moves to heating operation. Can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a configuration diagram of a heat pump hot water heater in the first embodiment of the present invention. In the figure, an outdoor unit 20 includes a compressor 1, a water-refrigerant heat exchanger 2, a decompressor 3, an air heat exchanger 4, a blower 5, a hot water return pipe 11, a tank 12, a pump 13, and a hot water outlet pipe 14. The air heat exchanger 15 is provided with an air heat exchanger temperature sensor 30 that detects the temperature of the air heat exchanger. There are terminal panels 16 and 17 connected to the hot water piping, and a remote controller 18 operated by the user is installed.

  The decompressor 3 here may be an electromagnetic expansion valve. Further, the tank 12 and the pump 13 are located between the hot water outlet pipe 14 and the water-refrigerant heat exchanger 2, but are not limited, and may be located between the hot water return pipe 11 and the water-refrigerant heat exchanger 2. .

  Next, FIG. 2 is a control block diagram of the heat pump type hot water heater in the first embodiment of the present invention.

  In FIG. 2, in the control device 40 provided on the outdoor unit 20 side, the temperature of the air heat exchanger temperature sensor 30 is detected by the air heat exchanger temperature detecting means 51, and the defrosting time expires in the previous defrosting operation. The defrosting start determination unit 50 makes a defrosting start determination unit 50 based on the information stored in the storage unit 52 that stores whether or not the defrosting is completed. The defrosting operation is performed by controlling the machine operating means 61, the decompressor opening varying means 62, the blower operating means 63, the pump operating means 64, and the thermal valve 15 opening / closing means 65. The defrosting operation is terminated by the defrosting operation time timer 66 that counts the time during the defrosting operation and the defrosting end determination means 70 based on the information of the air heat exchanger temperature detection means 51.

  Next, FIG. 3 demonstrates the operation | movement at the time of heating operation with a flowchart.

  First, when the user performs an operation for starting the heating operation, the heating operation is started. Next, it is determined whether or not the defrosting start temperature (air heat exchanger temperature) A1 determined in advance is lower (step S1).

  Here, when it is not the defrost start temperature A1 or less, it is repeatedly determined, and when it is the defrost start temperature A1 or less, the information stored in the storage means 52 is 0 (in accordance with the defrost end temperature in the previous defrost operation). Defrosting is completed) or 1 (defrosting is completed by the defrosting end time in the previous defrosting operation) is determined (step S2).

  When the information memorize | stored by the memory | storage means 52 is 0, the defrost start time counted simultaneously with becoming defrost start temperature A1 or less is set with the predetermined defrost start time T1 (step S3).

  And it is judged whether it is more than defrost start time T1 (step S4). Here, when it is not the defrost start time T1 or more, it is repeatedly determined, and when it is the defrost start time T1 or more, the defrost operation is performed (step S5).

And it is judged whether it is more than the predetermined defrost end temperature (air heat exchanger temperature) B (step S6). Here, in the case of the defrost end temperature B or higher, the defrost operation is terminated and the heating operation is performed (step S8). If it is not equal to or higher than the defrosting end temperature B, it is determined whether it is equal to or longer than a predetermined defrosting end time C (step S7).

  Here, when it is not more than defrost end time C, it transfers to step S6 and it is judged repeatedly, and when it is more than defrost end time C, a defrost operation is complete | finished and heating operation is performed (step S8).

  When the information memorize | stored by the memory | storage means 52 in step S2 is 1, the defrost start time counted simultaneously with becoming defrost start temperature A1 or less is decided beforehand from the defrost start time T1 decided beforehand. It is set as T2 (T2 = T1-t1) shortened for t1 (step S9).

  And it is judged whether it is more than defrost start time T2 (step S10). Here, when it is not the defrost start time T2 or more, it is repeatedly determined, and when it is the defrost start time T2 or more, the defrost operation is performed (step S11).

  And it is judged whether it is more than predetermined defrost end temperature (air heat exchanger temperature) B (Step S12). Here, when the temperature is equal to or higher than the defrosting end temperature B, the information stored in the storage unit 52 is set to 0 (step S13), the defrosting operation is terminated, and the heating operation is performed (step S15).

  Moreover, when it is not more than the defrost end temperature B, it is judged whether it is more than the defrost end time C previously determined (step S14). Here, when it is not more than defrost end time C, it transfers to step S12 and it is judged repeatedly, and when it is more than defrost end time C, a defrost operation is complete | finished and heating operation is performed (step S15).

  Next, referring to FIG. 4, another operation during heating operation will be described with reference to a flowchart.

  First, when the user performs an operation for starting the heating operation, the heating operation is started. Next, the information stored in the storage means 52 is 0 (defrosting is terminated by the defrosting end temperature in the previous defrosting operation) or 1 (defrosting is terminated by the defrosting end time in the previous defrosting operation). ) Is determined (step S1).

  When the information memorize | stored by the memory | storage means 52 is 0, it sets with the defrost start temperature (air heat exchanger temperature) A1 determined beforehand (step S2). Next, it is determined whether the defrosting start temperature A1 or lower (step S3).

  Here, when the temperature is not equal to or lower than the defrost start temperature A1, the determination is repeated. Next, when the temperature is equal to or lower than the defrost start temperature A1, the defrost start time counted at the same time as the temperature is equal to or lower than the defrost start temperature A1 is determined in advance. It is determined whether the defrosting start time T1 has elapsed or not (step S4).

  Here, when it is not the defrost start time T1 or more, it is repeatedly determined, and when it is the defrost start time T1 or more, the defrost operation is performed (step S5). And it is judged whether it is more than the predetermined defrost end temperature (air heat exchanger temperature) B (step S6).

  Here, in the case of the defrost end temperature B or higher, the defrost operation is terminated and the heating operation is performed (step S8).

If it is not equal to or higher than the defrosting end temperature B, it is determined whether it is equal to or longer than a predetermined defrosting end time C (step S7). Here, when it is not more than defrost end time C, it transfers to step S6 and it is judged repeatedly, and when it is more than defrost end time C, a defrost operation is complete | finished and heating operation is performed (step S8).

  When the information stored in the storage means 52 in step S1 is 1, the predetermined defrosting start temperature (air heat exchanger temperature) A1 is increased to the predetermined a1 temperature A2 (A2 = A1 + a1). Is set (step S9).

  Next, it is determined whether the defrosting start temperature A2 or lower (step S10). Here, if it is not the defrost start temperature A2 or less, it is repeatedly judged. Next, if it is the defrost start temperature A2 or less, the defrost start time to be counted at the same time as the defrost start temperature A2 or less is determined in advance. It is determined whether or not the defrosting start time T1 has elapsed (step S11).

  Here, when it is not the defrost start time T1 or more, it is repeatedly determined, and when it is the defrost start time T1 or more, the defrost operation is performed (step S12). And it is judged whether it is more than the predetermined defrost end temperature (air heat exchanger temperature) B (step S13).

  Here, in the case where the temperature is equal to or higher than the defrosting end temperature B, the information stored in the storage unit 52 is set to 0 (step S14), the defrosting operation is terminated, and the heating operation is performed (step S16). If it is not equal to or higher than the defrosting end temperature B, it is determined whether it is equal to or longer than a predetermined defrosting end time C (step S15).

  Here, when it is not more than defrost end time C, it transfers to step S13 and it is judged repeatedly, and when it is more than defrost end time C, a defrost operation is complete | finished and heating operation is performed (step S16).

  As described above, by providing the storage means 52 in the present embodiment, the state of frost attached to the air heat exchanger before the start of the previous defrost operation and the air heat exchanger after the end of the defrost operation remain. The state of frost can be roughly recognized, and the next defrosting time can be changed when the defrosting is completed due to the expiration of time during the defrosting operation.

  As described above, in the embodiment of the present invention, the outdoor unit in which the indoor unit and the outdoor unit are integrated, and the heat pump hot water heater that does not use the four-way valve for switching between cooling and heating are described. The same effect can be expected in a heat pump hot water heater using a type in which an indoor unit and an outdoor unit are separated, and a four-way valve, and it is included in the present invention.

  As described above, the heat pump hot water heater of the present invention can be applied to any heat pump hot water heater since it can perform heating operation without any trouble even if frost adheres to the evaporator.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Water-refrigerant heat exchanger 3 Pressure reducer 4 Air heat exchanger 5 Blower 11 Hot water return piping 12 Tank 13 Pump 14 Hot water going piping 15 Thermal valve 16 Terminal panel 1 (heating terminal 1)
17 Terminal panel 2 (heating terminal 2)
18 Remote controller 20 Outdoor unit 30 Air heat exchanger temperature sensor 40 Control device

Claims (2)

A refrigerant circuit comprising a compressor, a water-refrigerant heat exchanger, a decompressor, and an air heat exchanger, and a water circuit in which the water-refrigerant heat exchanger and the heating terminal are connected via a hot water return pipe and a hot water return pipe. And a control device, wherein the control device stores that the defrosting operation for melting the frost adhering to the air heat exchanger has been performed for a predetermined time and the defrosting operation is performed. When this is memorized, the heat pump type hot water heater characterized by shortening the operation time of the defrosting operation performed thereafter. A refrigerant circuit comprising a compressor, a water-refrigerant heat exchanger, a decompressor, and an air heat exchanger, and a water circuit in which the water-refrigerant heat exchanger and the heating terminal are connected via a hot water return pipe and a hot water return pipe. And a control device and a temperature sensor that detects the temperature of the air heat exchanger, and the control device performs a defrosting operation for melting frost adhering to the air heat exchanger for a predetermined time set in advance. When the start of the defrosting operation is determined based on the temperature detected by the temperature sensor and the fact that the defrosting operation is performed is stored, the defrosting operation performed thereafter is stored. A heat pump type hot water heater characterized by increasing the operation start temperature of the heat pump.