JP6247133B2 - Heat pump water heater - Google Patents

Description

  The present invention relates to a heat pump type water heater having a hot water storage tank unit and a heat pump unit, and having a water refrigerant heat exchanger in the hot water storage tank unit.

  Conventionally, in this type of heat pump type hot water heater, as shown in Patent Document 1, a hot water storage tank for storing hot water for hot water supply, and a water refrigerant heat exchanger for heating the hot water in the hot water storage tank, A hot water storage tank unit, a compressor for compressing the refrigerant, an expansion means for expanding the refrigerant, an air heat exchanger as a heat source, a water refrigerant heat exchanger for the hot water storage tank unit, There was a configuration in which a heat pump unit was connected to a communication refrigerant pipe.

JP 2001-280697 A

  However, in this conventional apparatus, when the hot water storage tank unit and the heat pump unit are installed at a distance of about 10 m, the amount of heat radiation in the communication refrigerant pipe increases as the communication refrigerant pipe becomes longer, and the midnight time Even when trying to boil the entire amount in the hot water storage tank in accordance with the end time of the belt, the boiling may not be completed and water that could not be boiled may remain in the lower part of the hot water storage tank.

  If boiling is not completed in this way, it is necessary to compensate for this by increasing the amount of electricity during the daytime when the unit price of electricity is high, so the electricity bill will be high and the hot water storage tank will not be full. In addition, the remote controller's hot water storage amount display is not displayed every day, and there is a problem that it may lead to a complaint.

In order to solve the above-mentioned problems, the present invention provides a hot water storage tank for storing hot water, a heating circuit for circulating hot water taken out from the lower part of the hot water tank to the upper part of the hot water tank, and a middle part of the heating circuit. A circulating pump provided, a water refrigerant heat exchanger provided in communication with a secondary side in the middle of the heating circulation circuit for heating hot water in the hot water storage tank, and a primary side of the water refrigerant heat exchanger A tank-side refrigerant inlet pipe that communicates the inlet of the tank and the tank-side refrigerant inlet joint, and a tank-side refrigerant outlet pipe that communicates the primary-side outlet and the tank-side refrigerant outlet joint of the water refrigerant heat exchanger. Refrigerant in order from the hot water storage tank unit, the heat pump side refrigerant pipe that communicates the heat pump side refrigerant inlet joint and the heat pump side refrigerant outlet joint, and the inlet side of the heat pump side refrigerant pipe An expansion valve for expanding, an air heat exchanger as an evaporator for evaporating the expanded refrigerant, and a compressor for pumping the evaporated refrigerant, and a blower for blowing air to the air heat exchanger A connecting refrigerant pipe connecting the heat pump unit, the tank-side refrigerant inlet joint and the heat pump-side refrigerant outlet joint, and connecting the tank-side refrigerant outlet joint and the heat pump-side refrigerant inlet joint, and the connecting refrigerant pipe; Long piping mode setting means for setting the long piping mode when the length is longer than the predetermined length, and boiling the hot water in the hot water storage tank by controlling the heat pump unit and the circulation pump in a specific time zone The heating control means for performing the operation and the feed at the time of the boiling operation according to the setting contents of the long piping mode setting means. And a rotational speed setting means for setting a revolution speed of the machine.

Further, in claim 2, a hot water storage tank for storing hot water, a heating circulation circuit for circulating hot water taken out from the lower part of the hot water storage tank to the upper part of the hot water storage tank, a circulation pump provided in the middle of the heating circulation circuit, A water-refrigerant heat exchanger provided on the secondary side in the middle of the heating circulation circuit for heating hot water in the hot water storage tank, a primary-side inlet and a tank-side refrigerant inlet joint for heating the water-refrigerant heat exchanger A hot water storage tank unit having a tank side refrigerant inlet pipe communicating with the tank, a tank side refrigerant outlet pipe communicating with the primary side outlet and the tank side refrigerant outlet joint of the water refrigerant heat exchanger, and a heat pump side refrigerant A heat pump side refrigerant pipe communicating with the inlet joint and the heat pump side refrigerant outlet joint; an expansion valve for expanding the refrigerant in order from the inlet side of the heat pump side refrigerant pipe; A heat pump unit having an air heat exchanger as an evaporator for evaporating the refrigerant and a compressor for pumping the evaporated refrigerant, and a blower for blowing air to the air heat exchanger, the tank side When the refrigerant inlet joint and the heat pump side refrigerant outlet joint are connected, and the connecting refrigerant pipe connecting the tank side refrigerant outlet joint and the heat pump side refrigerant inlet joint respectively, and the connecting refrigerant pipe is longer than a predetermined length Long piping mode setting means for setting that it is a long piping mode, and boiling control for controlling the heat pump unit and the circulation pump to boil hot water in the hot water storage tank during a specific time period And rotation for setting the rotation speed of the blower during the boiling operation according to the setting contents of the long piping mode setting means And a setting means.

  As described above, in the first and second aspects of the present invention, the heating capacity reduced by installing the long pipe is increased to or near the original heating capacity by increasing the frequency of the compressor or increasing the rotational speed of the blower in the long pipe mode. By raising to the boiling point, boiling can be completed in accordance with the end time of the specific time zone.

Moreover, in Claim 3, the hot water storage tank which stores hot water, the heating circulation circuit which circulates the hot water taken out from the said hot water storage tank lower part to the said hot water storage tank, the circulation pump provided in the said heating circulation circuit, A water-refrigerant heat exchanger provided on the secondary side in the middle of the heating circulation circuit for heating hot water in the hot water storage tank, a primary-side inlet and a tank-side refrigerant inlet joint for heating the water-refrigerant heat exchanger A hot water storage tank unit having a tank side refrigerant inlet pipe communicating with the tank, a tank side refrigerant outlet pipe communicating with the primary side outlet and the tank side refrigerant outlet joint of the water refrigerant heat exchanger, and a heat pump side refrigerant A heat pump side refrigerant pipe communicating with the inlet joint and the heat pump side refrigerant outlet joint; an expansion valve for expanding the refrigerant in order from the inlet side of the heat pump side refrigerant pipe; An evaporator for evaporating the refrigerant, a compressor for pumping the evaporated refrigerant, and the heat pump unit having a, with connecting the heat pump refrigerant outlet fitting and the tank-side refrigerant inlet fitting, the tank-side refrigerant outlet fitting And the refrigerant pipe connecting the heat pump side refrigerant inlet joint, the long pipe mode setting means for setting the long pipe mode when the communication refrigerant pipe is longer than a predetermined length, and the specific time zone Boiling control means for controlling the heat pump unit and the circulation pump to perform boiling operation for boiling hot water in the hot water storage tank, and the boiling to complete the boiling operation at the end time of the specific time zone start time calculating means boiling calculates the start time boiling to start-up operation, of the long pipe mode setting means And a start time correction means boiling for correcting the boiling start time in accordance with the constant content.

  Thus, in the invention of claim 3, in the long piping mode, the boiling start time is calculated so as to complete the boiling at the end time of the midnight time zone with the heating capacity reduced by the long piping installation. The boiling can be completed in accordance with the end time of the time zone.

Further, in claim 4, a hot water storage tank for storing hot water, a heating circulation circuit for circulating hot water taken out from the lower part of the hot water storage tank to the upper part of the hot water storage tank, a circulation pump provided in the middle of the heating circulation circuit, A water-refrigerant heat exchanger provided on the secondary side in the middle of the heating circulation circuit for heating hot water in the hot water storage tank, a primary-side inlet and a tank-side refrigerant inlet joint for heating the water-refrigerant heat exchanger A hot water storage tank unit having a tank side refrigerant inlet pipe communicating with the tank, a tank side refrigerant outlet pipe communicating with the primary side outlet and the tank side refrigerant outlet joint of the water refrigerant heat exchanger, and a heat pump side refrigerant A heat pump side refrigerant pipe communicating with the inlet joint and the heat pump side refrigerant outlet joint; an expansion valve for expanding the refrigerant in order from the inlet side of the heat pump side refrigerant pipe; An air heat exchanger as an evaporator that evaporates the refrigerant, a compressor that pumps the evaporated refrigerant, a blower that blows air to the air heat exchanger, and a temperature of the air heat exchanger A heat pump unit having an air heat exchanger temperature sensor, and the tank side refrigerant inlet joint and the heat pump side refrigerant outlet joint are connected, and the tank side refrigerant outlet joint and the heat pump side refrigerant inlet joint are respectively connected. The communication refrigerant pipe, the long pipe mode setting means for setting that the communication refrigerant pipe is in the long pipe mode when the communication refrigerant pipe is longer than a predetermined length, and defrosting when the air heat exchange temperature sensor detects the frost formation determination temperature or less. defrosting to set the defrosting control means for causing the operation, the operating frequency of the compressor during the defrosting operation depending on the setting of the long pipe mode setting means And a wave number setting means.

  In this way, in the invention of claim 4, in the long piping mode, the defrosting operation that takes a long time due to the increase in the heat radiation amount in the communication refrigerant piping is increased, and the compressor frequency during the defrosting operation is increased. Thus, the defrosting time can be shortened, whereby the boiling can be completed in accordance with the end time of the specific time zone.

Moreover, in Claim 5, the hot water storage tank which stores hot water, the heating circulation circuit which circulates the hot water taken out from the said hot water storage tank lower part to the said hot water storage tank, the circulation pump provided in the said heating circulation circuit, A water-refrigerant heat exchanger provided on the secondary side in the middle of the heating circulation circuit for heating hot water in the hot water storage tank, a primary-side inlet and a tank-side refrigerant inlet joint for heating the water-refrigerant heat exchanger A hot water storage tank unit having a tank side refrigerant inlet pipe communicating with the tank, a tank side refrigerant outlet pipe communicating with the primary side outlet and the tank side refrigerant outlet joint of the water refrigerant heat exchanger, and a heat pump side refrigerant A heat pump side refrigerant pipe communicating with the inlet joint and the heat pump side refrigerant outlet joint; an expansion valve for expanding the refrigerant in order from the inlet side of the heat pump side refrigerant pipe; An air heat exchanger as an evaporator that evaporates the refrigerant, a compressor that pumps the evaporated refrigerant, a blower that blows air to the air heat exchanger, and a temperature of the air heat exchanger A heat pump unit having an air heat exchanger temperature sensor, and the tank side refrigerant inlet joint and the heat pump side refrigerant outlet joint are connected, and the tank side refrigerant outlet joint and the heat pump side refrigerant inlet joint are respectively connected. The communication refrigerant pipe, the long pipe mode setting means for setting that the communication refrigerant pipe is in the long pipe mode when the communication refrigerant pipe is longer than a predetermined length, and defrosting when the air heat exchange temperature sensor detects the frost formation determination temperature or less. Bei a defrosting control unit for causing the operation, the frost formation determination temperature setting means for setting the frost determination temperature depending on the setting of the long pipe mode setting means It was.

  Thus, in the invention of claim 5, in the long piping mode, the defrosting operation is started while the frosting amount of the air heat exchanger is small so as to shorten the defrosting time. The boiling can be completed in accordance with the end time of the specific time zone.

Moreover, in Claim 6, the hot water storage tank which stores hot water, the heating circulation circuit which circulates the hot water taken out from the said hot water storage tank to the said hot water storage tank upper part, the circulation pump provided in the said heating circulation circuit, A water-refrigerant heat exchanger provided on the secondary side in the middle of the heating circulation circuit for heating hot water in the hot water storage tank, a primary-side inlet and a tank-side refrigerant inlet joint for heating the water-refrigerant heat exchanger A hot water storage tank unit having a tank side refrigerant inlet pipe communicating with the tank, a tank side refrigerant outlet pipe communicating with the primary side outlet and the tank side refrigerant outlet joint of the water refrigerant heat exchanger, and a heat pump side refrigerant A heat pump side refrigerant pipe communicating with the inlet joint and the heat pump side refrigerant outlet joint; an expansion valve for expanding the refrigerant in order from the inlet side of the heat pump side refrigerant pipe; An evaporator for evaporating the refrigerant, a compressor for pumping the evaporated refrigerant, and the heat pump unit having a, with connecting the heat pump refrigerant outlet fitting and the tank-side refrigerant inlet fitting, the tank-side refrigerant outlet fitting And the refrigerant pipe connecting the heat pump side refrigerant inlet joint, the long pipe mode setting means for setting the long pipe mode when the communication refrigerant pipe is longer than a predetermined length, and the specific time zone A boiling control means for controlling a heat pump unit and the circulation pump to perform boiling operation for boiling hot water in the hot water storage tank to a target boiling temperature, and performing the boiling operation at the end time of the specific time zone. Boiling that calculates the boiling start time for starting the boiling operation to be completed using the target boiling temperature Start time calculating means, and when the long pipe mode is set by the long pipe mode setting means, the boiling control means causes the boiling operation to be raised to a temperature lower than the target boiling temperature. I did it.

  Thus, in the sixth aspect of the invention, in the long piping mode, the boiling per unit time is obtained by boiling at a boiling temperature lower than the target boiling temperature used when calculating the boiling start time. By increasing the flow rate, boiling can be completed in accordance with the end time of the specific time zone.

  As described above, according to the present invention, it is possible to complete the boiling of the hot water storage tank to the full tank in accordance with the end time of the specific time zone even if a long pipe is installed, and unnecessary boiling outside the specific time zone. By suppressing the increase, it is possible to prevent running out of hot water, and to eliminate the risk of complaints due to not filling up.

Schematic configuration diagram of one embodiment of the present invention Control block diagram of the same embodiment Flowchart explaining boiling operation of the same embodiment The flowchart explaining the calculation step of the boiling start time of the same position embodiment The flowchart explaining the defrost operation of the same embodiment Control block diagram of another embodiment Flowchart explaining boiling operation of another embodiment The flowchart explaining the calculation step of the boiling start time of another one Embodiment

Next, a heat pump type water heater 1 according to an embodiment of the present invention will be described with reference to FIG.
2 is a hot water storage tank unit having a stainless steel hot water storage tank 3 for storing hot water, 4 is a heat pump unit constituting heating means for boiling hot water in the hot water storage tank 3 mainly at midnight, etc., 5 is a hot water supply set temperature. It is a remote controller for performing operations such as changing the.

  The hot water storage tank unit 2 includes a water supply pipe 6 for supplying city water to the bottom of the hot water storage tank 3, a hot water discharge pipe 7 for discharging hot water from the upper part of the hot water storage tank 3, a water supply bypass pipe 8 branched from the water supply pipe 6, and a hot water supply pipe 7. A hot water mixing valve 9 for mixing hot water from the hot water supply water and water from the water supply bypass pipe 8 so as to reach a hot water supply set temperature, a hot water supply pipe 11 for supplying hot water mixed by the hot water supply mixing valve 9 to the faucet 10, A hot water supply temperature sensor 12 provided in the middle of the hot water supply pipe 11 to detect the hot water supply temperature, a hot water supply flow rate sensor 13 provided in the middle of the hot water supply pipe 11 to detect the flow rate of hot water supply, and a water supply provided in the middle of the water supply bypass pipe 8 to detect the supply water temperature. A plurality of temperature sensors 14, a hot water storage temperature sensor 15 provided on the upper and lower sides of the hot water storage tank 2 to detect the hot water storage temperature, and a pressure reducing valve 16 provided in the water supply pipe 6 to reduce the supply water pressure of city water to a constant pressure; , Hot water storage And overpressure relief is valve 17 is provided for releasing the excessive pressure in the tank 2.

  Further, the hot water storage tank unit 2 is provided near the lower part of the hot water storage tank 3 in the heating circulation circuit 18, and is provided with hot water taken out from the lower part of the hot water storage tank 3. A circulation pump 19 that circulates in the upper part of the hot water storage tank 3, a water refrigerant heat exchanger 20 that is provided on the downstream side of the circulation pump 19 of the heating circulation circuit 18 and constitutes heating means for boiling hot water in the hot water storage tank 3, A heating temperature sensor 21 provided on the downstream side of the water refrigerant heat exchanger 20 in the heating circulation circuit 18 for detecting the temperature of hot water flowing out of the water refrigerant heat exchanger 20, and a primary side of the water refrigerant heat exchanger 20. A tank side refrigerant inlet pipe 23 connecting the inlet and the tank side refrigerant inlet joint 22, and a tank side refrigerant outlet connecting the primary side outlet and the tank side refrigerant outlet joint 24 of the water refrigerant heat exchanger 20. And the pipe 25 is provided.

  The heat pump unit 4 expanded with a heat pump side refrigerant pipe 28 that communicates the heat pump side refrigerant inlet joint 26 and the heat pump side refrigerant outlet joint 27, and an expansion valve 29 that expands the refrigerant in order from the inlet side of the heat pump side refrigerant pipe 28. An air heat exchanger 30 as an evaporator that evaporates the refrigerant and a compressor 31 that compresses and discharges the evaporated refrigerant are provided, and a blower 32 that blows outside air serving as a heat source is provided in the air heat exchanger 30. ing.

  Reference numeral 33 denotes a discharge temperature sensor that detects the temperature of the refrigerant discharged from the compressor 31, 34 denotes an air heat exchanger temperature sensor that detects the temperature of the air heat exchanger 30, and 35 denotes outside air blown to the air heat exchanger 30. It is an outside air temperature sensor that detects temperature.

  36 connects the heat pump side refrigerant outlet joint 27 and the tank side refrigerant inlet joint 23 and also connects the tank side refrigerant outlet joint 24 and the heat pump side refrigerant inlet joint 26 to convert the refrigerant from the compressor 31 into water refrigerant heat. This is a communication refrigerant pipe that is circulated back to the primary side of the exchanger 20. The communication refrigerant pipe 36 is a copper pipe cut out at the installation site with a length corresponding to the distance between the hot water storage tank unit 2 and the heat pump unit 4 and is flared to each joint.

  37 is provided in the hot water storage tank unit 2, and the detected values of the hot water temperature sensor 12, the hot water flow rate sensor 13, the hot water temperature sensor 14, the hot water temperature sensor 15, and the boiling temperature sensor 21 are input, and the hot water mixing valve 9 and the circulation pump. The hot water storage control means is connected to the heat pump unit 4 and the remote controller 5 so as to be able to transmit and receive necessary information. Here, the hot water storage control means 36 has a logic circuit such as an MPU and controls the operation according to a program stored in advance while referring to the memory.

  38 is provided in the heat pump unit 4, and the detection values of the discharge temperature sensor 33, the air heat exchange temperature sensor 34, and the outside air temperature sensor 35 are input to control the operation of the expansion valve 29, the compressor 31, and the blower 32, It is a heating control means connected to the hot water storage control means 37 so that necessary information can be transmitted and received. Here, the heating control means 38 has a logic circuit such as an MPU and controls the operation according to a program stored in advance while referring to the memory.

  The remote controller 5 includes a display unit 39 for displaying various information related to the water heater (hot water set temperature, amount of remaining hot water, operating state of the water heater, etc.) and operation switches such as a setting switch for setting and operating the hot water set temperature. 40, a remote controller which receives an operation signal of the operation switch 40 and a signal from the hot water storage control means 37, causes the display unit 39 to perform a predetermined necessary display, and transmits a signal based on the operation signal to the hot water storage control means 37 Control means 41 is provided. Here, the remote control means 41 has a logic circuit such as an MPU and controls the operation according to a program stored in advance while referring to the memory.

  Here, the hot water storage control means 37, the heating control means 38, and the remote control control means 41 exchange necessary information and act as control means for controlling the operation of the heat pump type hot water heater 1 in cooperation with each other.

  Next, a description will be given based on the control block diagram shown in FIG. 2. When 42 is provided in the remote controller 40 and the communication refrigerant pipe 36 is longer than a predetermined length according to the operation of the operation switch 39 of the remote controller 5. Long piping mode setting means for setting that the long piping mode is set. When the long piping mode is set, the remote control means 41 transmits the fact to the hot water storage control means 37, and the hot water storage control means 37 switches to the long piping mode. The setting is memorized.

  The hot water storage control means 37 controls the heat pump unit 4 and the circulation pump 19 in a specific time zone such as a midnight time period when the electric power unit price is low, and performs a boiling operation for boiling hot water in the hot water storage tank 3. A heating control means 43, a boiling start time calculating means 44 for calculating a boiling start time ts for starting a boiling operation to complete the boiling operation at the end time of the specific time zone, and a long piping mode setting means 42 A boiling start time correcting means 45 for correcting the boiling start time ts according to the set content is provided.

  The heating control means 38 includes a frequency setting means 46 for setting the operating frequency of the compressor 31 during the boiling operation according to the setting contents of the long piping mode setting means 42 and the outside air temperature or the feed water temperature, and the long piping mode setting. The rotational speed setting means 47 for setting the rotational speed of the blower 32 during the boiling operation according to the setting contents of the means 42 and the outside air temperature or the feed water temperature, and the air heat exchanger temperature sensor 34 is below a predetermined frosting determination temperature. A defrosting control unit 48 that performs a defrosting operation upon detection, a defrosting frequency setting unit 49 that sets the operating frequency of the compressor 31 during the defrosting operation according to the setting contents of the long piping mode setting unit 42, and a long There is provided frost determination temperature setting means 50 for setting a predetermined frost determination temperature value in accordance with the setting contents of the piping mode setting means 42.

<Hot-water supply operation>
Next, when the faucet 10 is opened and the hot water supply flow rate sensor 13 detects a flow rate higher than the amount that can be regarded as the start of hot water supply, the hot water storage control unit 37 sets the hot water supply temperature detected by the hot water supply temperature sensor 12 to the hot water supply set temperature set by the remote controller 5. Then, the opening degree of the hot water supply mixing valve 9 is adjusted so that hot water from the hot water outlet pipe 7 and water from the hot water supply bypass pipe 8 are mixed to supply hot water at a hot water supply set temperature.

  At this time, the hot water storage control means 37 converts the amount of heat used into a hot water supply amount of a predetermined temperature from the hot water supply temperature detected by the hot water supply temperature sensor 14, the hot water supply flow rate detected by the hot water supply flow rate sensor 13 and the hot water supply set temperature, and accumulates and stores them. .

  When the flow rate detected by the hot water supply flow rate sensor 13 decreases to a flow rate less than an amount that can be regarded as hot water supply stop, for example, when the faucet 10 is closed, the hot water storage control means 37 ends the adjustment of the opening degree of the hot water supply mixing valve 9 and supplies hot water. finish.

<Boiling operation>
Next, a low-cost boiling operation at low power unit price will be described based on the flowchart of FIG. Here, a description will be given based on a rate system in which the power unit price is lower than the other daytime hours in the midnight time zone from 23:00 to 7:00 the next morning, which is a specific time zone, but is not limited to this. It is also possible to use a fee system that allows a cheap late-night time from 8:00 to 8:00 the next morning.

  When the current time is 23:00 and the start time of the midnight time zone is reached (Yes in step S1), the blower 32 is temporarily driven at a slight rotation speed, and the outside air temperature sensor 35 detects the outside air temperature Ta (step S2). The frequency setting means 46 determines a temporary frequency during operation of the compressor 31 according to the outside air temperature, and the rotation speed setting means 47 sets a temporary rotation speed during operation of the blower 32 (step S3). Here, the lower the outside air temperature Ta, the higher the frequency of the compressor 31 and the higher the rotation speed of the blower 32, so that the heating capacity is kept constant.

  Next, the frequency setting means 46 confirms whether or not the long piping mode is set by the long piping mode setting means 42. If the long piping mode is set (Yes in step S4), the frequency setting means 46 in step S3. The temporarily determined frequency of the compressor 31 is increased by a predetermined frequency (here, 5 Hz) (step S5), and the frequency during the boiling operation of the compressor 31 is set (step S6). Then, it is confirmed whether or not the long piping mode is set by the long piping mode setting means 42. If the long piping mode is set (Yes in step S4), the rotational speed of the blower 32 temporarily determined in step S3. Is increased by a predetermined number of rotations (here, 100 rpm) (step S5), and the number of rotations during the heating operation of the blower 32 is set (step S6). .

  Here, the increase amount of the frequency of the compressor 31 and the rotational speed of the blower 32 in the long piping mode is determined so as to approach the heating capacity when long piping is not installed when long piping is installed. However, in this embodiment, even if the frequency of the compressor 31 and the rotation speed of the blower 32 are increased, it is preferable that the heating capacity is equal to the heating capacity when the long pipe is not installed. It is assumed that heating capacity is not enough when long piping is not installed.

  In the next step S7, the boiling start time calculating means 44 calculates the boiling start time. This calculation step will be described based on the flowchart of FIG.

  The boiling start time calculating means 44 calculates the necessary heat quantity Q required for the next day based on the daily use heat quantity for the past several days accumulated and stored as the hot water supply load (step S71). Here, the required heat amount Q is calculated and determined from the sum of the average value of the hot water supply amount converted into the predetermined temperature in the past week, a value based on the standard deviation, and a margin (for example, heat amount for 100 L converted at 43 ° C.). I am doing so.

    Next, the boiling start time calculating means 44 determines the target boiling temperature Tset from the table data corresponding to the stored outside air temperature Ta according to the outside air temperature Ta detected by the outside air temperature sensor 35 (step S72). ). Here, the target boiling temperature Tset is 65 ° C. when the outside air temperature Ta is less than 10 ° C., and 62 ° C. when the outside air temperature Ta is 10 ° C. or more.

  Note that table data of the feed water temperature Tw and the target boiling temperature Tset is stored in advance in the control means 41 instead of the relationship data between the outside air temperature Ta and the target boiling temperature Tset. The target boiling temperature Tset may be determined based on the feed water temperature Tw detected by the hot water storage temperature sensor 15, and the target may be set according to the magnitude of the required heat quantity Q in addition to the outside air temperature Ta and the feed water temperature Tw. The boiling temperature Tset may be determined.

  Then, the boiling start time calculating unit 44 calculates the target boiling amount V by dividing the necessary heat amount Q by the value obtained by subtracting the feed water temperature Tw from the target boiling temperature Tset (step S73). When the necessary heat quantity Q is large, the shortage that cannot be heated up in the midnight time zone is boiled up in the daytime time zone heating operation.

  Next, the boiling start time calculating means 44 calculates a remaining hot water amount Vz that is equal to or higher than the remaining hot water determination temperature (for example, 50 ° C.) based on the temperature detected by the hot water storage temperature sensor 15 (step S74). The remaining hot water amount Vz is reduced to calculate the boiling required amount Vp (step S75).

  The boiling start time correcting unit 45 determines a coefficient α for correcting the boiling start time according to the setting contents of the long piping mode setting unit 42, and the long piping mode is set. If YES in step S76, the coefficient α is set to 0.85 (step S77). If the long piping mode is not set, NO is determined in step S76, and the coefficient α is set to 0.90. Here, the coefficient α is a coefficient that gives a margin to the heating capacity W of the heat pump unit 4 used for calculating the boiling start time ts, and the boiling start time ts is started earlier as the value is smaller. The time ts is corrected.

  Next, the boiling start time calculating means 44 starts boiling a predetermined heating capacity W of the heat pump unit 4 by multiplying the boiling required amount Vp by the boiling temperature difference (Tset−Tw). By dividing by the value obtained by multiplying the correction value α determined by the time correction means 45, the required boiling time tn required to heat the required boiling amount Vp to the target boiling temperature Tset is calculated (step S79). Here, 860 in the equation of step S79 is a conversion value for converting the heating capacity W into the amount of heat.

  In step S80, the boiling start time calculation means 44 boils up the time that has passed from the end time of the midnight time zone (here, AM 7:00) by the required boiling time tn and a margin time M (for example, 30 minutes). The start time ts is calculated.

  When the boiling start time ts is calculated in step S7 of the flowchart of FIG. 3 and the current time reaches the boiling start time ts (Yes in step S8), the boiling control means 43 determines the target boiling determined in step S72. In order to start the boiling operation at the raising temperature Tset, the heat pump unit 4 and the circulation pump 19 are started to drive, and the water taken out from the lower part of the hot water storage tank 3 is heated to the hot water of the target boiling temperature Tset to be placed at the upper part of the hot water storage tank 3. The hot water is returned and stored in a stacked form (step S9).

  When the bottom boiling hot water temperature sensor 15 serving as the boiling end temperature sensor detects a predetermined boiling end temperature (Yes in step S10) and the completion of boiling is detected, the boiling control means 44 Then, the heat pump unit 4 and the circulation pump 19 are stopped and the boiling operation is finished (step S12), and the flow of the boiling operation is finished. On the other hand, when the current time reaches AM 7:00, which is the end time of the midnight time zone (Yes in step S11), the heat pump unit 4 and the circulation pump 19 are stopped and the boiling operation is ended (step S12). The flow of the boiling operation is finished.

  In this way, by increasing the frequency of the compressor 31 or increasing the rotational speed of the blower 32 in the long piping mode, the heating capacity reduced by the long piping installation is increased to or close to the original heating capacity. Boiling can be completed according to the end time of the belt, and in the long piping mode, heating is started to complete the boiling at the end time of the midnight time zone with the heating capacity reduced by the long piping installation. Since the time is calculated, the boiling can be completed in accordance with the end time of the midnight time zone.

  As a result, even if a long pipe is installed, the hot water storage tank 3 can be completely heated up to the full time in accordance with the end time of the midnight time zone, and unnecessary boiling increases outside the midnight time zone can be suppressed. In addition to preventing cuts, there is no fear of claims due to not filling up.

<Defrosting operation>
Next, based on FIG. 5, the defrosting operation | movement for removing the air heat exchanger 34 frosting during a boiling operation and removing this is demonstrated. If the long pipe is installed, the amount of heat radiation in the communication refrigerant pipe 36 increases due to the length of the communication refrigerant pipe 36, the defrosting operation time of the air heat exchanger 30 is prolonged, and the end time of the midnight time zone is reached. In addition, there is a problem in that the hot water storage tank 3 cannot be completely heated up to a full tank.

  Therefore, when the long piping mode is set according to the setting content of the long piping mode setting unit 42 (Yes in step S21), the defrosting frequency setting unit 49 sets the frequency of the compressor 31 during the defrosting operation. Is set to the first frequency value (95 Hz in this case) (step S22), and when the long piping mode is not set (No in step S21), the frequency of the compressor 31 during the defrosting operation is set to the second frequency. The frequency value (here, 90 Hz) is set (step S24). Note that the first frequency value is higher than the second frequency value.

  Here, since the frequency value of the compressor 31 during the defrosting operation when the long piping mode is set is set to a value higher than the frequency value when the long piping mode is not set, the refrigerant circulation amount increases. In addition, the heat radiation in the communication refrigerant pipe 36 when the long pipe is installed is compensated for to shorten the defrosting time.

  Moreover, the frost determination temperature setting means 50 is determined as a determination value for starting the defrosting operation when the long piping mode is set according to the setting contents of the long piping mode setting means 42 (Yes in step S21). Is set to the first determination temperature (here, −6 ° C.) (step S23), and when the long piping mode is not set (No in step S21), the frost determination temperature is set to the second frost determination temperature. Is set to a determination value (−8 ° C. here) (step S25). Note that the first determination value is higher than the second determination value.

  Here, since the frosting determination temperature when the long piping mode is set is higher than the frosting determination temperature when the long piping mode is not set, air heat exchange is performed in the long piping mode. The defrosting operation is started in a state where the amount of frost on the device 30 is small, and as a result, the defrosting time is shortened.

  When the air heat exchanger temperature sensor 34 detects that the temperature is equal to or lower than the frosting determination temperature set in step S23 or step S25 during the boiling operation (Yes in step S26), the defrost control means 48 removes the frost. A frost start signal is transmitted to the hot water storage control means 37, the expansion valve 29 is fully opened (step S27), the compressor 31 is driven at the defrost frequency set in step S22 or step S24 (step S28), and the compressor 31 The compressed refrigerant is passed through the water-refrigerant heat exchanger 20 and the expansion valve 29, and the high-temperature refrigerant is allowed to flow into the air heat exchanger 30 to melt the frost adhering to the surface of the air heat exchanger 30. . The hot water storage control unit 37 that has received the defrosting start signal stops the circulation pump 19 so as not to take heat of the refrigerant circulating for defrosting.

  When the air heat exchanger temperature sensor 34 detects a predetermined defrosting completion temperature (here, 10 ° C.) or more (step S29), the defrosting control means 48 transmits a defrosting completion signal to the hot water storage control means 37, and the expansion valve 29 is returned to the opening before starting the defrosting operation (step S30), the compressor 31 is returned to the frequency before the defrosting operation (step S31), the defrosting operation is terminated, and the defrosting operation completion signal is received. The hot water storage control means 37 resumes the driving of the circulation pump 19 and returns to the original boiling operation.

  In this way, the defrosting time can be shortened by increasing the frequency of the compressor 31 during the defrosting operation in the long piping mode, thereby completing the boiling in accordance with the end time of the midnight time zone. In the long piping mode, the defrosting operation is started while the amount of frost formation of the air heat exchanger 30 is small so as to shorten the defrosting time. The boiling can be completed according to the above.

  As a result, even if a long pipe is installed, the hot water storage tank 3 can be completely heated up to the full time in accordance with the end time of the midnight time zone, and unnecessary boiling increases outside the midnight time zone can be suppressed. In addition to preventing cuts, there is no fear of claims due to not filling up.

  In addition, this invention is not limited to the said embodiment, For example, the long piping mode setting means 42 may be provided on the electronic substrate of the hot water storage control means 37 as a DIP switch. Further, as the long piping mode, a plurality of stages such as a medium distance and a long distance are provided, and the boiling start time correcting means 45, the frequency setting means 46, the rotation speed setting means 47, the defrost frequency setting means 59, and the frost determination temperature setting. The means 50 may set an appropriate value according to each stage. In the above embodiment, the heating start time correcting unit 45, the frequency setting unit 46, the rotation speed setting unit 47, the defrost frequency setting unit 59, and the frost determination temperature setting unit 50 are all described. Any one or a combination of two or more may be used.

<Another embodiment>
Next, a heat pump type water heater according to another embodiment of the present invention will be described with reference to FIGS. In addition, the same thing as previous one Embodiment attaches | subjects the same code | symbol, and shall abbreviate | omit the description.

  In FIG. 6, reference numeral 51 denotes a boiling that heats up the hot water in the hot water storage tank 3 to the target boiling temperature Tset by controlling the heat pump unit 4 and the circulation pump 19 in a specific time zone such as a midnight time zone where the power unit price is low. When the long pipe mode is set by the long pipe mode setting means 42, the boiling control means 51 is a constant temperature (here, 2 ° C.) higher than the target boiling temperature Tset. It is intended to boil to a low temperature.

  52 is a boiling start time calculating means for calculating a boiling start time ts for starting a boiling operation to complete the boiling operation at the end time of the specific time zone, using the target boiling temperature Tset.

<Boiling operation>
Next, a low-cost boiling operation at a low power charge unit price will be described based on the flowchart of FIG. Here, a description will be given based on a rate system in which the power unit price is lower than the other daytime hours in the midnight time zone from 23:00 to 7:00 the next morning, which is a specific time zone, but is not limited to this. It is also possible to use a fee system that allows a cheap late-night time from 8:00 to 8:00 the next morning.

  When the current time is 23:00 and the start time of the midnight time zone is reached (Yes in step S51), the blower 32 is temporarily driven at a slight rotational speed, and the outside air temperature sensor 35 detects the outside air temperature Ta (step S52). The heating control means 38 sets the frequency during operation of the compressor 31 and the rotation speed during operation of the blower 32 according to the outside air temperature (step S53). Here, the lower the outside air temperature Ta, the higher the frequency of the compressor 31 and the higher the rotation speed of the blower 32, so that the heating capacity is kept constant.

  In the next step S54, the boiling start time calculating means 52 calculates the boiling start time. This calculation step will be described based on the flowchart of FIG.

  The boiling start time calculation means 52 calculates the necessary heat quantity Q required for the next day based on the daily use heat quantity for the past several days accumulated and stored as the hot water supply load (step S541). Here, the required heat amount Q is calculated and determined from the sum of the average value of the hot water supply amount converted into the predetermined temperature in the past week, a value based on the standard deviation, and a margin (for example, heat amount for 100 L converted at 43 ° C.). I am doing so.

  Next, the boiling start time calculating means 52 determines the target boiling temperature Tset from the table data corresponding to the stored outside air temperature Ta according to the outside air temperature Ta detected by the outside air temperature sensor 35 (step S542). ). Here, the target boiling temperature Tset is 67 ° C. when the outside air temperature Ta is less than 10 ° C., and 65 ° C. when the outside air temperature Ta is 10 ° C. or more. The target boiling temperature Tset may be constant regardless of the outside air temperature.

  Then, the boiling start time calculation unit 52 calculates the target boiling amount V by dividing the necessary heat quantity Q by the value obtained by subtracting the feed water temperature Tw from the target boiling temperature Tset (step S543). When the necessary heat quantity Q is large, the shortage that cannot be heated up in the midnight time zone is boiled up in the daytime time zone heating operation.

  Next, the boiling start time calculating means 52 calculates a remaining hot water amount Vz equal to or higher than the remaining hot water determination temperature (for example, 50 ° C.) based on the temperature detected by the hot water storage temperature sensor 15 (step S544). The remaining hot water amount Vz is reduced to calculate the boiling required amount Vp (step S545).

  The boiling start time calculation means 52 divides the value obtained by multiplying the required boiling amount Vp by the boiling temperature difference (Tset−Tw) by the predetermined heating capacity W of the heat pump unit 4 to be heated. The required boiling time tn required to heat the required amount Vp to the target boiling temperature Tset is calculated (step S545). Here, 860 in the formula of step S545 is a conversion value for converting the heating capacity W into the amount of heat.

  In step S546, the boiling start time calculation means 52 boils up the time that has passed by the boiling time tn and the margin time M (for example, 30 minutes) from the end time of the midnight time zone (here, AM 7:00). The start time ts is calculated.

  When the boiling start time ts is calculated in step S54 in the flowchart of FIG. 7, the boiling control unit 51 determines whether or not the long piping mode is set by the long piping mode setting unit 42 (step S55). When the long piping mode is set, a temperature lower than the target boiling temperature Tset set by the boiling start time calculating means 52 by a certain temperature (here, 2 ° C.) is set as a new target boiling temperature Tset (step S56). ).

  When the current time reaches the boiling start time ts (Yes in step S57), the boiling control means 51 starts driving the heat pump unit 4 and the circulation pump 19 in order to start the boiling operation at the target boiling temperature Tset. Then, the water taken out from the lower part of the hot water storage tank 3 is heated to the hot water at the target boiling temperature Tset, returned to the upper part of the hot water storage tank 3 and stored in a stacked form (step S58).

  Then, when the boiling hot water storage temperature sensor 15 as the boiling end temperature sensor detects a predetermined boiling end temperature (Yes in step S59) and the completion of boiling is detected, the boiling control means 51 Then, the heat pump unit 4 and the circulation pump 19 are stopped to finish the boiling operation (step S61), and the flow of the boiling operation is finished. On the other hand, when the current time reaches AM 7:00, which is the end time of the midnight time zone (Yes in step S60), the heat pump unit 4 and the circulation pump 19 are stopped and the boiling operation is ended (step S61). The flow of the boiling operation is finished.

  In this way, in the long piping mode, since the boiling is performed at a temperature lower than the target boiling temperature Tset used in the boiling start time calculation step, the boiling flow rate per unit time of the water refrigerant heat exchanger 20 is increased. Thus, even with the heating capacity reduced by the long pipe installation, the boiling can be completed in accordance with the end time of the midnight time zone.

  As a result, even if a long pipe is installed, the hot water storage tank 3 can be completely heated up to the full time in accordance with the end time of the midnight time zone, and unnecessary boiling increases outside the midnight time zone can be suppressed. In addition to preventing cuts, there is no fear of claims due to not filling up.

  In addition, this invention is not limited to the said embodiment, It does not prevent changing in the range which does not change the summary of invention.

DESCRIPTION OF SYMBOLS 1 Heat pump type hot water heater 2 Hot water storage tank unit 3 Hot water storage tank 4 Heat pump unit 18 Heating circulation circuit 19 Circulating pump 20 Water refrigerant heat exchanger 22 Tank side refrigerant inlet joint 23 Tank side refrigerant inlet pipe 24 Tank side refrigerant outlet joint 25 Tank side refrigerant Outlet pipe 26 Heat pump side refrigerant inlet joint 27 Heat pump side refrigerant outlet joint 28 Heat pump side refrigerant pipe 29 Expansion valve 30 Air heat exchanger 31 Compressor 32 Blower 34 Air heat exchanger temperature sensor 36 Communication refrigerant pipe 42 Long pipe mode setting means 43 Boiling Heating control means 44 Heating start time calculating means 45 Heating start time correcting means 46 Frequency setting means 47 Rotation speed setting means 48 Defrost control means 49 Defrost frequency setting means 50 Frosting determination temperature setting means 51 Heating control means 52 Boil start time calculation means

Claims (6)

A hot water storage tank for storing hot water, a heating circulation circuit for circulating hot water taken out from the lower part of the hot water storage tank to the upper part of the hot water storage tank, a circulation pump provided in the middle of the heating circulation circuit, and two in the middle of the heating circulation circuit A tank-side refrigerant that communicates between a water-refrigerant heat exchanger that is provided in communication with the secondary side to heat hot water in the hot water storage tank, and a primary-side inlet and a tank-side refrigerant inlet joint of the water-refrigerant heat exchanger. A hot water storage tank unit having an inlet pipe, a tank-side refrigerant outlet pipe communicating with a primary-side outlet and a tank-side refrigerant outlet joint of the water refrigerant heat exchanger, a heat pump-side refrigerant inlet joint, and a heat pump-side refrigerant outlet A heat pump side refrigerant pipe communicating with the joint, an expansion valve for expanding the refrigerant in order from the inlet side of the heat pump side refrigerant pipe, and evaporating the expanded refrigerant And Hatsuki, a compressor for pumping the evaporated refrigerant, and the heat pump unit having a, with connecting the heat pump refrigerant outlet fitting and the tank-side refrigerant inlet fitting, the heat pump refrigerant and the tank-side refrigerant outlet fitting A communication refrigerant pipe for connecting to each of the inlet joints, a long pipe mode setting means for setting the long pipe mode when the communication refrigerant pipe is longer than a predetermined length, and the heat pump unit and the circulation in a specific time zone Boiling control means for performing a boiling operation for boiling hot water in the hot water storage tank by controlling a pump, and operation of the compressor during the boiling operation according to the setting contents of the long piping mode setting means A heat pump type hot water heater comprising frequency setting means for setting a frequency. A hot water storage tank for storing hot water, a heating circulation circuit for circulating hot water taken out from the lower part of the hot water storage tank to the upper part of the hot water storage tank, a circulation pump provided in the middle of the heating circulation circuit, and two in the middle of the heating circulation circuit A tank-side refrigerant that communicates between a water-refrigerant heat exchanger that is provided in communication with the secondary side to heat hot water in the hot water storage tank, and a primary-side inlet and a tank-side refrigerant inlet joint of the water-refrigerant heat exchanger. A hot water storage tank unit having an inlet pipe, a tank-side refrigerant outlet pipe communicating with a primary-side outlet and a tank-side refrigerant outlet joint of the water refrigerant heat exchanger, a heat pump-side refrigerant inlet joint, and a heat pump-side refrigerant outlet A heat pump side refrigerant pipe communicating with the joint, an expansion valve for expanding the refrigerant in order from the inlet side of the heat pump side refrigerant pipe, and evaporating the expanded refrigerant An air heat exchanger as a generator, a compressor that pumps the evaporated refrigerant, and a blower that blows air to the air heat exchanger, a heat pump unit, the tank-side refrigerant inlet joint, and the A connection refrigerant pipe connecting the heat pump side refrigerant outlet joint and connecting the tank side refrigerant outlet joint and the heat pump side refrigerant inlet joint respectively, and a long pipe mode when the communication refrigerant pipe is longer than a predetermined length. A long piping mode setting means for setting the effect, a boiling control means for controlling the heat pump unit and the circulation pump in a specific time period to perform a boiling operation for boiling hot water in the hot water storage tank, Rotational speed setting means for setting the rotational speed of the blower during the boiling operation according to the setting content of the piping mode setting means Heat pump water heater characterized by and. A hot water storage tank for storing hot water, a heating circulation circuit for circulating hot water taken out from the lower part of the hot water storage tank to the upper part of the hot water storage tank, a circulation pump provided in the middle of the heating circulation circuit, and two in the middle of the heating circulation circuit A tank-side refrigerant that communicates between a water-refrigerant heat exchanger that is provided in communication with the secondary side to heat hot water in the hot water storage tank, and a primary-side inlet and a tank-side refrigerant inlet joint of the water-refrigerant heat exchanger. A hot water storage tank unit having an inlet pipe, a tank-side refrigerant outlet pipe communicating with a primary-side outlet and a tank-side refrigerant outlet joint of the water refrigerant heat exchanger, a heat pump-side refrigerant inlet joint, and a heat pump-side refrigerant outlet A heat pump side refrigerant pipe communicating with the joint, an expansion valve for expanding the refrigerant in order from the inlet side of the heat pump side refrigerant pipe, and evaporating the expanded refrigerant And Hatsuki, a compressor for pumping the evaporated refrigerant, and the heat pump unit having a, with connecting the heat pump refrigerant outlet fitting and the tank-side refrigerant inlet fitting, the heat pump refrigerant and the tank-side refrigerant outlet fitting A communication refrigerant pipe for connecting to each of the inlet joints, a long pipe mode setting means for setting the long pipe mode when the communication refrigerant pipe is longer than a predetermined length, and the heat pump unit and the circulation in a specific time zone A boiling control means for performing a boiling operation for boiling hot water in the hot water storage tank by controlling a pump, and starting the boiling operation to complete the boiling operation at the end time of the specific time zone start time calculating means boiling for calculating a boiling start time, the depending on the setting of the long pipe mode setting means Heat pump water heater, characterized in that a boiling start time correction means for correcting the up start time comes. A hot water storage tank for storing hot water, a heating circulation circuit for circulating hot water taken out from the lower part of the hot water storage tank to the upper part of the hot water storage tank, a circulation pump provided in the middle of the heating circulation circuit, and two in the middle of the heating circulation circuit A tank-side refrigerant that communicates between a water-refrigerant heat exchanger that is provided in communication with the secondary side to heat hot water in the hot water storage tank, and a primary-side inlet and a tank-side refrigerant inlet joint of the water-refrigerant heat exchanger. A hot water storage tank unit having an inlet pipe, a tank-side refrigerant outlet pipe communicating with a primary-side outlet and a tank-side refrigerant outlet joint of the water refrigerant heat exchanger, a heat pump-side refrigerant inlet joint, and a heat pump-side refrigerant outlet A heat pump side refrigerant pipe communicating with the joint, an expansion valve for expanding the refrigerant in order from the inlet side of the heat pump side refrigerant pipe, and evaporating the expanded refrigerant An air heat exchanger as a generator, a compressor that pumps the evaporated refrigerant, a blower that blows air to the air heat exchanger, and an air heat exchanger temperature sensor that detects the temperature of the air heat exchanger And a refrigerant pump connecting the tank side refrigerant outlet joint and the heat pump side refrigerant outlet joint, and connecting the tank side refrigerant outlet joint and the heat pump side refrigerant inlet joint, respectively, A long pipe mode setting means for setting that the communication refrigerant pipe is in a long pipe mode when the communication refrigerant pipe is longer than a predetermined length, and a defrosting operation when the air heat exchanger temperature sensor detects a frosting determination temperature or lower. Bei frost control unit, and a defrosting frequency setting means for setting the operation frequency of the compressor during the defrosting operation depending on the setting of the long pipe mode setting means Heat pump water heater, characterized in that the. A hot water storage tank for storing hot water, a heating circulation circuit for circulating hot water taken out from the lower part of the hot water storage tank to the upper part of the hot water storage tank, a circulation pump provided in the middle of the heating circulation circuit, and two in the middle of the heating circulation circuit A tank-side refrigerant that communicates between a water-refrigerant heat exchanger that is provided in communication with the secondary side to heat hot water in the hot water storage tank, and a primary-side inlet and a tank-side refrigerant inlet joint of the water-refrigerant heat exchanger. A hot water storage tank unit having an inlet pipe, a tank-side refrigerant outlet pipe communicating with a primary-side outlet and a tank-side refrigerant outlet joint of the water refrigerant heat exchanger, a heat pump-side refrigerant inlet joint, and a heat pump-side refrigerant outlet A heat pump side refrigerant pipe communicating with the joint, an expansion valve for expanding the refrigerant in order from the inlet side of the heat pump side refrigerant pipe, and evaporating the expanded refrigerant An air heat exchanger as a generator, a compressor that pumps the evaporated refrigerant, a blower that blows air to the air heat exchanger, and an air heat exchanger temperature sensor that detects the temperature of the air heat exchanger And a refrigerant pump connecting the tank side refrigerant outlet joint and the heat pump side refrigerant outlet joint, and connecting the tank side refrigerant outlet joint and the heat pump side refrigerant inlet joint, respectively, A long pipe mode setting means for setting that the communication refrigerant pipe is in a long pipe mode when the communication refrigerant pipe is longer than a predetermined length, and a defrosting operation when the air heat exchanger temperature sensor detects a frosting determination temperature or lower. a frost control means, characterized in that a frost formation determination temperature setting means for setting the frost determination temperature depending on the setting of the long pipe mode setting means Toponpu water heater. A hot water storage tank for storing hot water, a heating circulation circuit for circulating hot water taken out from the lower part of the hot water storage tank to the upper part of the hot water storage tank, a circulation pump provided in the middle of the heating circulation circuit, and two in the middle of the heating circulation circuit A tank-side refrigerant that communicates between a water-refrigerant heat exchanger that is provided in communication with the secondary side to heat hot water in the hot water storage tank, and a primary-side inlet and a tank-side refrigerant inlet joint of the water-refrigerant heat exchanger. A hot water storage tank unit having an inlet pipe, a tank-side refrigerant outlet pipe communicating with a primary-side outlet and a tank-side refrigerant outlet joint of the water refrigerant heat exchanger, a heat pump-side refrigerant inlet joint, and a heat pump-side refrigerant outlet A heat pump side refrigerant pipe communicating with the joint, an expansion valve for expanding the refrigerant in order from the inlet side of the heat pump side refrigerant pipe, and evaporating the expanded refrigerant And Hatsuki, a compressor for pumping the evaporated refrigerant, and the heat pump unit having a, with connecting the heat pump refrigerant outlet fitting and the tank-side refrigerant inlet fitting, the heat pump refrigerant and the tank-side refrigerant outlet fitting A communication refrigerant pipe for connecting to each of the inlet joints, a long pipe mode setting means for setting the long pipe mode when the communication refrigerant pipe is longer than a predetermined length, and the heat pump unit and the circulation in a specific time zone A boiling control means for controlling the pump to perform boiling operation for boiling hot water in the hot water storage tank to a target boiling temperature, and the boiling to complete the boiling operation at the end time of the specific time zone A boiling start time calculating means for calculating a boiling start time for starting a lifting operation using the target boiling temperature; And when the long piping mode is set by the long piping mode setting means, the boiling control means is configured to perform a boiling operation for boiling to a temperature lower than the target boiling temperature. Heat pump type water heater.

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