JP2009047334A - Heat pump type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump type water heater free from wasteful increase of heating capacity of a heat pump unit even when the heat is used in hot-water supply and the like during a boiling-up operation in a midnight power time zone. <P>SOLUTION: In this heat pump type water heater comprising a hot water storage tank 2 for storing hot water, and the heat pump unit 3 heating the hot water in the hot water storage tank 2, and controlling boiling-up so that the boiling-up operation is terminated before a termination time of the midnight power time zone by a prescribed time, a heat consumption calculating means 28 is disposed to calculate the heat consumption in hot-water supply from the hot water storage tank 2 after the start of the boiling-up operation, so that the boiling-up operation is performed with a rated heating capacity of the heat pump unit 3, when the heat consumption calculated by the heat consumption calculating means 28 is less than the prescribed heat quantity, and the boiling-up operation is performed in a state that the heating capacity of the heat pump unit 3 is increased to be more than the rated heating capacity, when the heat consumption calculated by the heat consumption calculating means 28 is over the prescribed heat consumption. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat pump type water heater for boiling hot water in a hot water storage tank in a specific time zone.

  Conventionally, in this type of heat pump water heater, hot water in a hot water storage tank is heated by a heat pump unit and stored in a hot water storage tank during a time when electricity charges are low, such as late-night power hours, and this hot water is used for hot water supply. ing. So-called peak shift control that delays the start of boiling operation from the start of the late-night power hours so that the boiling operation ends before the end of the late-night power hours in the case of using these late-night power hours Has been done.

If it is detected that the hot water in the hot water storage tank is used for hot water supply etc. during the boiling operation during such late-night power hours, the heating capacity of the heat pump unit is increased from the rated value. In some cases, the heat pump unit was operated in a state where the heat pump unit was operated, and the boiling was completed within the expected time. (For example, refer to Patent Document 1.)
JP 2007-93113 A

  However, this conventional type has a heating capacity of the heat pump unit when it is detected that the hot water heated in the hot water storage tank is used for hot water supply or the like during the boiling operation in the midnight power hours. Since the heat pump unit is operated in a state where it is higher than the rated value, the amount of hot water used for hot water supply is small, that is, the heat pump is in a state where the heating capacity of the heat pump unit is increased above the rated value even if there is little heat used. The unit may be operated, and the one that was controlled so that the boiling operation ends a little before the end of the midnight power time period is operated with the heating capacity of the heat pump unit raised above the rating As a result, the boiling operation may end earlier than planned, and as a result, the heated water is In addition to this, there is a problem that the heat pump unit operation is continued with the heating capacity of the heat pump unit higher than the rated value. This has a problem that it causes discomfort and further shortens the life of the heat pump unit.

  In order to solve the above-mentioned problems, the present invention has the configuration particularly as claimed in claim 1, comprising a hot water storage tank for storing hot water and a heat pump unit for heating the hot water in the hot water storage tank. Calculate the required boiling time based on the rated heating capacity of the unit, and start the boiling operation in a heat pump water heater that performs boiling control so that the boiling operation ends before a predetermined time before the end of the midnight power hours Thereafter, provided is a use heat amount calculating means for calculating the amount of heat used for hot water supply from the hot water storage tank. When the use heat amount calculated by the use heat amount calculation means is less than a predetermined heat amount, the heating capacity of the heat pump unit is rated. When the heating operation is performed as it is and the amount of used heat calculated by the used heat amount calculating means exceeds a predetermined amount of heat, the heat The heating capacity of the pump unit was assumed to perform the boiling operation in the state of being higher than the rated.

  Further, in claim 2, when the usage heat amount calculated by the usage heat amount calculation means is the usage heat amount exceeding the predetermined heat amount, the predetermined amount of heat is the midnight from a predetermined time before the end time of the midnight power period. Subtracting the amount of heat that can be given to the hot water when the heat pump unit is heated at the rated heating capacity in the time until the end time of the electric power time zone from the amount of heat used, and calculating the difference heat amount of the difference, Difference in the amount of heat that can be given to hot water per unit time between when the heating capacity of the heat pump unit is raised above the rating and when the heating capacity of the heat pump unit is heated at the rating The heat capacity of the heat pump is calculated until the time of boiling the heat corresponding to the differential heat quantity with the differential capacity heat quantity. It performs boiling operation knit heating capacity while being higher than the rated, then was to perform heating operation by returning the heating capacity of the heat pump unit rating.

  Further, in claim 3, when the use heat amount calculated by the use heat amount calculation means is the use heat amount exceeding the predetermined heat amount, the heating operation of the heat pump unit is performed in a state where the heating capacity is increased from the rated value. And calculating the differential capacity calorie, which is the difference in calorie that can be given to the hot water per unit time between the case and the heating capacity of the heat pump unit when rated and heated. The heating operation of the heat pump unit is performed in a state where the heating capacity of the heat pump unit is increased from the rated value until the time for boiling the corresponding amount of heat, and then the heating capacity of the heat pump unit is returned to the rated value and the heating operation is performed. .

  According to a fourth aspect of the present invention, when the usage heat quantity calculated by the usage heat quantity calculation means is a usage heat quantity exceeding the predetermined heat quantity, the midnight from a predetermined time before the end time of the midnight power time period, which is the predetermined heat quantity. Subtracting the amount of heat that can be given to the hot water when the heat pump unit is heated at the rated heating capacity in the time until the end time of the electric power time zone from the amount of heat used, and calculating the difference heat amount of the difference, Difference in the amount of heat that can be given to hot water per unit time between when the heating capacity of the heat pump unit is raised above the rating and when the heating capacity of the heat pump unit is heated at the rating The difference capacity calorie is calculated, and the difference capacity calorie is equal to or longer than the time to boil the heat corresponding to the difference calorie, and the difference capacity calorie. A heating operation is performed in a state where the heating capacity of the heat pump unit is raised above the rated value within a time period equal to or less than the heating time corresponding to the heat quantity used, and then the heating capacity of the heat pump unit is rated. The boiling operation was performed after returning.

  According to the first aspect of the present invention, the heating capacity of the heat pump unit is increased from the rated value when the amount of heat used during the boiling operation in the late-night power hours exceeds a predetermined amount of heat. The speed is increased, the amount of heat heated up per hour can be increased, and the amount of heat generated up to the end of the midnight power time period can be heated up. On the other hand, if the amount of heat used during the boiling operation is less than or equal to the specified amount of heat, the boiling operation will be completed by the end of the midnight power period even if the heating operation of the heat pump unit is rated and the boiling operation is continued. Therefore, it is not necessary to wastefully increase the heating capacity of the heat pump unit above the rating, and the operating noise and vibration of the compressor in the heat pump unit during operation with the heating capacity of the heat pump unit higher than the rating are not generated. There is no problem of increasing the size, and further, the life of the heat pump unit is not shortened.

  According to claim 2, when the amount of heat used during the boiling operation exceeds the predetermined amount of heat, the midnight power time from the predetermined time before the end time of the midnight power time zone that is the predetermined amount of heat. The amount of heat that can be given to hot water when the heat pump unit is heated at the rated heating capacity in the time until the end time of the belt is subtracted from the amount of heat used, that is, the difference heat amount of the difference, that is, the end of the midnight power hours When calculating the amount of heat that is insufficient to heat up, which is estimated to be insufficient at times, and when the heating capacity of the heat pump unit is raised above the rating, and when the heating capacity of the heat pump unit is heated at the rating And calculating a differential capacity calorie that is a difference in calorie that can be given to hot water per unit time in The heating operation of the heat pump unit is performed in a state where the heating capacity of the heat pump unit is increased from the rated value until the time to boil the amount of heat corresponding to the amount of insufficient boiling heat, which is the amount, and then the heating capacity of the heat pump unit is returned to the rated value. Since the boiling operation is to be performed, it is possible to compensate for the insufficient heating amount that is the difference heat amount, and the boiling of the hot water in the hot water storage tank can be completed by the end of the midnight power time period, and The heating operation of the heat pump unit can be reduced as much as possible to reduce the amount of time it takes to perform the boiling operation, thus reducing discomfort to the user such as the operating noise and vibration of the compressor in the heat pump unit. It is possible to reduce the burden on the heat pump unit.

  According to claim 3, when the amount of heat used during the boiling operation exceeds the predetermined amount of heat, when the heating operation of the heat pump unit is raised above the rating, The heat capacity of the heat pump unit is calculated by calculating the differential capacity heat amount, which is the difference in the amount of heat that can be given to the hot water per unit time in the case where the heating capacity is heated to the rated value, and the differential heat capacity corresponds to the heat capacity used. Boiling operation is performed with the heating capacity of the heat pump unit raised above the rated value until the amount of heat is raised, and then the heating capacity of the heat pump unit is returned to the rated value and the heating operation is performed. Even if the heat quantity exceeding the specified heat quantity is used during hot water supply, etc., the heating capacity of the heat pump unit has been raised above the rating. By performing the heating operation and increasing the heating speed, it becomes possible to end the heating operation at approximately the same time as the originally scheduled time for the completion of the heating operation. Since the heating capacity of the heat pump unit is returned to the rated value and the boiling operation is performed, the boiling operation is finished earlier than the time when the boiling operation is scheduled to end, and the temperature of the heated hot water decreases due to heat dissipation. It does not occur, and the boiling of hot water in the hot water storage tank can be completed by the end time of the midnight power period.

  According to a fourth aspect of the present invention, when the usage heat amount calculated by the usage heat amount calculation means is the usage heat amount exceeding the predetermined heat amount, the predetermined heat amount is from a predetermined time before the end time of the midnight power period. The amount of heat that can be given to hot water when the heat pump unit performs the boiling operation at the rated heating capacity in the time until the end time of the midnight power time zone is subtracted from the used heat amount to calculate the difference heat amount of the difference. Furthermore, the amount of heat that can be given to hot water per unit time when the heating capacity of the heat pump unit is raised above the rated value and when the heating capacity of the heat pump unit is heated at the rated temperature. The difference capacity calorie is calculated, and the difference capacity calorie is equal to or greater than the time to boil the heat corresponding to the difference calorie, and the difference Heating operation is performed with the heating capacity of the heat pump unit raised above the rated value within a time equal to or less than the heating time corresponding to the heat quantity used, and then the heating capacity of the heat pump unit is rated. The boiling operation can be completed at about the same time as originally scheduled to end the boiling operation at the earliest, and the hot water storage tank by the end time of the midnight power hours at the latest The boiling of the hot water inside can be completed.

Next, an embodiment of the present invention will be described with reference to FIG.
1 is a hot water storage tank unit having a hot water storage tank 2 for storing hot water, 3 is a heat pump unit as a heating means for heating hot water in the hot water storage tank 2, 4 is a water refrigerant heat exchanger as a condenser of the heat pump unit 3, A heat pump circulation circuit 5 connects the lower part of the hot water storage tank 2 and the water refrigerant heat exchanger 4, supplies a hot water in the hot water tank 2 to the water refrigerant heat exchanger 4, and a water refrigerant heat exchanger 4. Is connected to the upper part of the hot water storage tank 2 and the hot water returned by the water refrigerant heat exchanger 4 is returned to the upper part of the hot water storage tank 2, and 8 is provided in the hot water circulation circuit 5 and is provided in the hot water storage tank 2. This is a circulation pump that circulates hot and cold water in the heat pump unit 3.

  9 is a water supply pipe connected to the lower end of the hot water storage tank 2 to supply water into the hot water storage tank 2, 10 is connected to the upper end of the hot water storage tank 2, and a hot water discharge pipe for discharging hot hot water is stored, 11 is branched from the water supply pipe 9 12 is a mixing valve that mixes water from the water supply bypass pipe 11 and hot water from the hot water discharge pipe 10 to a set temperature, 13 is a hot water supply pipe that supplies hot water having a mixed set temperature, and 14 is a kitchen. And a hot water tap provided in a bathroom, etc., and the hot water pipe 10, the mixing valve 12, and the hot water pipe 13 constitute a hot water supply path.

  15 is a hot water supply temperature sensor serving as a hot water supply temperature detecting means for detecting a hot water supply temperature provided downstream of the mixing valve 12, 16 is a hot water supply flow rate sensor serving as a hot water supply amount detecting means for counting the amount of hot water supply, and 17 is a predetermined pressure for water supply. A pressure reducing valve 18 is provided in the middle of the water supply pipe 9, a water supply temperature sensor serving as a water supply temperature detecting means for detecting the temperature of the water supply, and 19 is an overpressure relief valve for releasing the overpressure of the hot water storage tank 2.

  The heat pump unit 3 is composed of the water refrigerant heat exchanger 4 as a condenser, a compressor 20 with a variable speed, an electronic expansion valve 21, and an air heat exchanger 22 as a forced air-cooled evaporator. A circuit 23, a blower fan 24 that blows air to the air heat exchanger 22, and a heat pump control unit 25 that controls driving of the air heat exchanger 22 are provided. In the heat pump circuit 23, carbon dioxide is used as a refrigerant, and a supercritical heat pump. It constitutes a cycle.

  A plurality of hot water storage temperature sensors 26 as hot water storage temperature detecting means are arranged in the vertical direction of the hot water storage tank 2. In this embodiment, five hot water storage temperature sensors 26 are arranged, and temperature information detected by the hot water storage temperature sensor 26 is used. The amount of heat remaining in the hot water storage tank 2 is detected, and the temperature distribution in the vertical direction in the hot water storage tank 2 is detected.

  A hot water supply control unit 27 includes a microcomputer that controls the driving of each actuator in response to input of various sensors such as a hot water storage temperature sensor 26 in the hot water storage tank unit 1, and the hot water supply control unit 27 is configured as described above. Based on the temperature detected by the plurality of hot water storage temperature sensors 26, it is determined whether or not the amount of residual heat in the hot water storage tank 2 is sufficient. The hot water supply control unit 27 is connected to a hot water remote controller (not shown) wirelessly or by wire so that the user can set an arbitrary hot water supply set temperature, and the heat pump control unit 25 is also wired. It is communicably connected, and sends instructions to the heat pump control unit 25 such as starting and stopping a boiling operation to heat up the amount of hot water required for the next day by the end of the late-night electricity time zone where the electricity rate is low.

When the hot water supply flow sensor 16 detects that the hot water heated in the hot water storage tank 2 has been used for hot water supply or the like during the boiling operation, the hot water supply control unit 27 uses the amount of hot water detected by the hot water supply flow sensor 16. The apparatus has a used heat amount calculating means 28 for calculating the amount of heat used, that is, how much heat is used in the hot water storage tank 2. For example, assuming that 10 L of hot water having a hot water supply temperature of 40 ° C. is supplied at a water supply temperature of 10 ° C., the heat of use calculated by the heat of use calculation means 28 is
Amount of heat used = (hot water set temperature-water temperature) x hot water supply
= (40-10) × 10 = 300 kcal
Thus, it is calculated that 300 kcal of the amount of heat in the hot water storage tank 2 has been used with reference to the feed water temperature.

Next, the operation of the boiling control when hot water is used during the boiling operation of the embodiment shown in FIG. 1 will be described with reference to the flowcharts shown in FIGS. 2 and 3 and the hot water supply during the boiling operation shown in FIG. This will be described with reference to an explanatory diagram of boiling-up control when used.
As shown in the flowchart of FIG. 2, first, when the power charge reaches an inexpensive late-night power time zone start time, for example, 23:00, the hot water supply control unit 27 starts the boiling control, and step 1 (hereinafter referred to as S1). The target hot water storage heat amount Qw, which is an appropriate amount of heat, is calculated from the hot water supply load for the past several days, and a predetermined temperature range from the target hot water storage heat amount Qw and the water supply temperature Tw detected by the water supply temperature sensor 18 in S2. For example, an arbitrary boiling target temperature To within a range of 65 ° C. to 90 ° C. is calculated, and the remaining hot water amount Lt in the hot water storage tank 2 and the hot water storage in the current hot water storage tank 2 are calculated from the temperature detected by the hot water storage temperature sensor 26 in S3. The amount of heat Qt is calculated. Subsequently, the required boiling amount Lw obtained by subtracting the remaining hot water amount Lt from the hot water storage tank 2 capacity L in S4 is heated based on the required boiling heat amount Qh for boiling at the target temperature To and the rated heating capacity Wa of the heat pump unit 3. The heating time H is calculated, and in S5, the boiling start time Hs is calculated so that the boiling ends at the end time of the late-night power period, for example, a predetermined time before 7:00, for example, 6:30, 30 minutes before here. . The reason why the boiling end time is set to a predetermined time before the end time of the midnight power period, that is, 6:30 is to complete the heating with a margin, and the predetermined time is limited to 30 minutes. Not a thing.

Here, the target hot water storage heat quantity Qw calculated from the hot water supply load for the past several days in S1 is, for example, 25900 kcal, and the water supply temperature Tw detected by the water supply temperature sensor 18 in S2 is, for example, 10 ° C., the boiling target temperature To is, for example, 80 ° C., the remaining hot water amount Lt in the hot water storage tank 2 detected from the temperature detected by the hot water storage temperature sensor 26 in S3 is 100 L, for example, the hot water storage heat amount Qt in the current hot water storage tank 2 is 7000 kcal, In S4, the hot water storage tank 2 capacity L is set to, for example, 370 L, the required boiling amount Lw = the hot water storage tank 2 capacity L−the remaining hot water amount Lt = 270 L, and the rated heating capacity Wa of the heat pump unit 3 is set to, for example, 4.5 kW. When time H is calculated,
Necessary boiling time H = Necessary boiling heat quantity Qh / (860 × heating capacity Wa × heating efficiency α)
Necessary boiling heat quantity Qh = (tank capacity L−remaining hot water quantity Lt)
X (boiling target temperature To-feed water temperature Tw)
That means
Necessary boiling time H =
(Tank capacity L−remaining hot water amount Lt) × (boiling target temperature To−feed water temperature Tw)
/ (860 × heating capacity Wa × heating efficiency α)
= (370-100) x (80-10) / (860 x 4.5 x 0.9)
≒ 5.4 hours = 5 hours 24 minutes. And when calculating the boiling start time Hs so as to end at midnight power time end time in S5, for example, a predetermined time before 7:00, here 6:30, 30 minutes before,
Boiling start time Hs = End time of late-night power time zone-Required boiling time H-Predetermined time
= (7:00)-(5 hours 24 minutes)-(30 minutes)
= 1:06.

  Next, in S6, it is determined whether or not the current time has reached the boiling start time Hs. When the current time reaches the boiling start time Hs, the process proceeds to S7 with YES, and as shown in the flowchart of FIG. The control unit 27 issues a boiling operation start command to the heat pump control unit 25. Upon receiving this command, the heat pump controller 25 drives the circulation pump 8 after starting the heat pump unit 3, and causes the hot water taken out from the lower part of the hot water storage tank 2 to flow into the water / refrigerant heat exchanger 4 via the forward pipe 6. Heating is performed while exchanging heat, and the hot water heated by the heat pump unit 3 is stored in the hot water storage tank 2 by returning to the upper part of the hot water storage tank 2 through the return pipe 7. Here, the heating capability Wa of the heat pump unit 3 at the start of the boiling operation is a rated 4.5 kW, and thereafter, the heating operation with the heating capability Wa of the heat pump unit 3 being rated is abbreviated as a rated operation.

When the hot water supply flow sensor 16 detects that the hot water heated in the hot water storage tank 2 is used for hot water supply during such rated operation, the use heat amount calculation means 28 uses the amount of hot water detected by the hot water supply flow sensor 16. The amount of heat Qs is calculated, and it is determined whether or not the amount of heat Qs used exceeds the predetermined amount of heat Qb in S8. The predetermined heat amount Qb is the amount of heat that can be given to hot water when the rated operation is performed for a time period from a predetermined time before the end time of the midnight power period to the end time of the midnight power period, in this embodiment, 30 minutes. Specifically,
Predetermined heat quantity Qb = 860 × rated heating capacity Wa × predetermined time
= 860 × 4.5 × 0.5 = 1935 kcal
It becomes. Here, the rated operation boiling prediction straight line and the rated operation limit straight line shown in FIG. 4 will be described. The rated operation boiling prediction straight line is obtained when there is no use of hot water in the hot water storage tank 2 by hot water supply during the rated operation. This is a straight line that predicts the transition of the amount of heat generated by boiling, and the rated operation limit straight line indicated by a two-dot chain line is the power at the midnight of the rated operation when hot water is used in the hot water storage tank 2 during the rated operation. This represents a straight line that can complete boiling at 7:00, which is the time zone end time, and this rated operation limit straight line is drawn based on 1935 kacal which is the predetermined heat quantity Qb. If the amount of heat used Qs exceeds 1935 kcal, which is the calculated amount of heat Qb calculated above, that is, exceeds the rated operation limit straight line, boiling is completed by the end of the midnight time zone even if the rated operation is continued. It means not to.

  In S8, it is determined whether the used heat quantity Qs exceeds a predetermined heat quantity Qb. If the used heat quantity Qs is equal to or less than the predetermined heat quantity Qb, the process proceeds to S9 with NO, and the rated operation is continued in S9. It is determined whether or not the boiling has been completed. If the boiling has been completed, the boiling control is terminated with YES. If the boiling has not been completed, the process returns to S8 with NO. The determination as to whether or not the boiling has been completed is, for example, that the detected temperature detected by the hot water storage temperature sensor 26 provided at the bottom of the plurality of hot water storage temperature sensors 26 is equal to or higher than a preset boiling stop temperature. If the hot water storage temperature sensor 26 provided at the bottom of the plurality of hot water storage temperature sensors 26 detects the boiling stop temperature or higher, the hot water supply control unit 27 boils the heat pump control unit 25. A heating operation stop command is issued. Upon receiving this command, the heat pump control unit 25 stops the heating operation by stopping the heat pump unit 3 and the circulation pump 8, and ends the heating control.

  On the other hand, if it is determined in S8 that the used heat quantity Qs has exceeded the predetermined heat quantity Qb, the process proceeds to S11 with YES, and the heating capacity Wa of the heat pump unit 3 is rated 4.5 kW by increasing the rotational speed of the compressor 20 in S11. In a state in which the heating capacity Wa of the heat pump unit 3 is set to 6.0 kW, for example, is started at the rising operation time Hj for performing the rising operation. Enter the value 0. At this time, it is assumed that the ascending operation is performed in advance for at least a predetermined time, here, 5 minutes. Subsequently, in S12, it is determined whether or not the use heat quantity Qs has increased. If the use heat quantity Qs has increased, the process proceeds to S13 with YES, and the rising operation time Hj is calculated in S13, and the process proceeds to S14. If the used heat quantity Qs has not increased in S12, the process proceeds to S14 with NO. Then, in S14, the ascending operation time Hj is compared with the predetermined ascending operation time of 5 minutes, and it is determined whether the larger time has elapsed. If the larger time has elapsed, the process proceeds to S15 with YES, In S15, the heating capacity Wa of the heat pump unit 3 is returned to the rated operation of the rated 4.5 kW by decreasing the rotational speed of the compressor 20 from the ascending operation, and the used heat quantity Qs is reset and the process returns to S10, and in S14 If the larger time has not elapsed, the process returns to S12 with NO.

Here, the method of calculating the ascending operation time Hj in S13 will be described. First, the differential capacity calorie Qd, which is the difference in the amount of heat that can be given to hot water per unit time between the ascending operation and the rated operation. Is calculated. Then, a time for boiling the amount of heat corresponding to the used heat amount Qs is calculated by the differential capacity heat amount Qd, and this is set as the rising operation time Hj.
As a specific example, consider a case where the rising operation time Hj is calculated when the heat quantity Qs used exceeds 1935 kcal which is the predetermined heat quantity Qb and reaches 2000 kcal. First, when the differential capacity heat quantity Qd is calculated,
Differential capacity calorie | heat amount Qd = (The heating capability at the time of a raise operation-the heating capability at the time of rated operation) x860
= (6.0-4.5) × 860 = 1290 kcal / h
Thus, 1290 kcal per unit time can be given to hot water. And when calculating the time to boil the amount of heat corresponding to the used heat amount Qs with this differential capacity heat amount Qd, that is, the rising operation time Hj,
Climbing operation time Hj = use heat quantity Qs / differential capacity heat quantity Qd
= 2000 / 1290≈1.6 hours = 1 hour and 36 minutes. If the ascending operation is performed for 1 hour and 36 minutes from the start of the ascending operation, the amount of heat corresponding to the amount of heat used Qs can be given to the hot water. After that, when NO from S14, the process returns to S12, and when it is determined in S12 that the amount of heat used Qs has further increased to 3000 kcal due to hot water supply, the process proceeds to S13 again, and the rising operation time Hj is newly calculated in S13. 2 hours and 18 minutes are calculated, and the ascending operation time Hj is corrected to 2 hours and 18 minutes, which is the newly calculated ascending operation time Hj, in place of the previously ascending operation time Hj of 1 hour and 36 minutes.

  Further, when looking at the line representing the used heat quantity Qs used by the hot water supply indicated by the thick dotted line in FIG. 4 and the line representing the ascending operation indicated by the thick line, the downward slope of the line representing the used heat quantity Qs indicated by the thick dotted line is as follows. When it stops, that is, when the use of hot water is finished, it is shown that the ascending operation indicated by the bold line starts, but this is shown in this way for the sake of simplifying the explanation by the figure, Actually, as shown in the flowchart of FIG. 3, the ascending operation is also performed simultaneously with the hot water supply being used.

  In the heating control when hot water is used during the heating operation described above, it is determined in S8 whether the used heat quantity Qs exceeds the predetermined heat quantity Qb, and when the used heat quantity Qs exceeds the predetermined heat quantity Qb, If the heating capacity Wa of the heat pump unit 3 is in the rated operation, the target hot water storage amount Qw will not be reached by the end of the midnight power period, but at this time, the heating capacity Wa of the heat pump unit 3 is rated in S11. As a result of the rising operation, which is a boiling operation in a state where the temperature is increased, the boiling speed for boiling hot water is increased compared to the rated operation, and the amount of boiling heat heated up per hour can be increased. The amount of heat required for boiling up to the end of the time zone can be raised. On the other hand, if the used heat quantity Qs does not exceed the predetermined heat quantity Qb, the process proceeds to S9, and even if the rated operation is continued, the boiling operation is completed by the end time of the midnight power time period. It is not necessary to raise the heating capacity Wa from the rated value, and there is no problem that the operating noise and vibration of the compressor 20 in the heat pump unit 3 due to the ascending operation increase, and the life of the heat pump unit 3 is further increased. It is something that will not shrink.

  Further, the rising operation time Hj in S13 is set as the time for boiling the amount of heat corresponding to the used heat amount Qs with the differential capacity heat amount Qd, so that the heating speed is increased by boiling the used heat amount Qs by the rising operation. 4 can be pulled up to the rated operation boiling prediction straight line shown in FIG. 4, and when it is pulled up to the rated operation boiling prediction straight line, the operation is returned from the rising operation to the rated operation in S15. The boiling operation is terminated earlier than the scheduled time, and there is no problem that the temperature of the heated hot water decreases due to heat dissipation. The boiling time is almost the same as the originally scheduled time. It is also possible to end the boiling operation, and the boiling of the hot water in the hot water storage tank 2 can be completed by the end time of the midnight power hours. Than is.

  Further, in S13, the rising operation time Hj is the time to boil the heat corresponding to the used heat quantity Qs by the differential capacity calorie Qd, but the present invention is not limited to this, and the rising operation time Hj is used by the differential capacity heat quantity Qd. The amount of heat corresponding to the difference heat quantity Qe obtained by subtracting the predetermined heat quantity Qb from the above may be used as the time to boil up. Thus, the boiling of the hot water in the hot water storage tank 2 can be completed by the end time of the midnight power hours. Furthermore, since the time for performing the ascending operation can be reduced as much as possible, it is possible to reduce discomfort given to the user such as a large operating noise and vibration of the compressor 20 in the heat pump unit 3, and also reduce the burden on the heat pump unit 3. It can be done. Further, the ascending operation time Hj is within a time period equal to or longer than the time for boiling the amount of heat corresponding to the difference heat amount Qe with the differential capacity calorie Qd and less than the time for boiling the amount of heat corresponding to the used heat amount Qs with the differential capacity heat amount Qd. The heating operation can be terminated at about the same time as originally scheduled to end the heating operation at the earliest, until the end time of the late-night power hours at the latest The boiling of hot water in the hot water storage tank 2 can be completed.

  Note that the present invention is not limited to the above-described embodiment. In the present embodiment, the present invention is applied when the amount of heat in the hot water storage tank 2 is used by hot water supply during boiling operation. The present invention can be applied not only when the amount of heat in the tank 2 is used, but also when the amount of heat in the hot water storage tank 2 is used by filling a bathtub (not shown). Various modifications are possible within the range not changed, and this is not disturbed.

  Further, in the present embodiment, the used heat amount calculating unit 28 is included in the hot water supply control unit 27, but the used heat amount calculating unit 28 may be included in the heat pump control unit 25.

The schematic block diagram of one Embodiment of this invention. The principal part flowchart of the same embodiment. The principal part flowchart of the same embodiment. Explanatory drawing of the boiling control when there exists use of hot water supply during the boiling operation of the same embodiment.

Explanation of symbols

2 Hot water storage tank 3 Heat pump unit 28 Heat consumption calculation means

Claims (4)

  Equipped with a hot water storage tank that stores hot water and a heat pump unit that heats the hot water in the hot water storage tank, calculates the required boiling time based on the required amount of boiling heat and the rated heating capacity of the heat pump unit, and ends the midnight power hours In a heat pump water heater that performs boiling control so that the boiling operation ends before a predetermined time before the time, use heat amount calculation means for calculating the amount of heat used for hot water supply from the hot water storage tank after the start of the boiling operation When the amount of heat used calculated by the heat consumption calculation means is equal to or less than a predetermined heat amount, the heating operation of the heat pump unit is performed with the heating capacity being rated, and the heat consumption calculated by the heat consumption calculation means is When a predetermined amount of heat is exceeded, the heating capacity of the heat pump unit is raised above the rating and the boiling Heat pump water heater and performing the operation.   When the usage heat amount calculated by the usage heat amount calculation means is the usage heat amount exceeding the predetermined heat amount, from the predetermined time before the end time of the midnight power time zone, which is the predetermined heat amount, to the end time of the midnight power time zone Subtracting the amount of heat that can be given to hot water when the heat pump unit is heated at the rated heating capacity in the time of the time, subtracting from the amount of heat used, and calculating the difference heat amount of the difference, further heating capacity of the heat pump unit The difference capacity calorific value, which is the difference in the amount of heat that can be given to hot water per unit time when the heating operation is performed at a temperature higher than the rated value and when the heating capacity of the heat pump unit is heated at the rated value. The heating capacity of the heat pump unit is calculated until the time when the amount of heat corresponding to the difference heat quantity is boiled up with the difference capacity heat quantity. Was subjected to heating operation in a state of being higher than the rated, then heat pump water heater according to claim 1, characterized in that the heating operation by returning the heating capacity of the heat pump unit rating.   When the usage heat amount calculated by the usage heat amount calculation means is the usage heat amount exceeding the predetermined heat amount, the heating pump is heated up in a state where the heating capacity of the heat pump unit is increased from the rated value, and the heat pump unit Calculate the differential capacity calorie, which is the difference in the amount of heat that can be given to hot water per unit time when the heating capacity is heated at the rated value, and boil the calorie corresponding to the heat used by the differential capacity calorie The boiling operation is performed in a state where the heating capacity of the heat pump unit is increased from the rated value until a time, and then the heating capacity of the heat pump unit is returned to the rated value and the boiling operation is performed. Heat pump water heater.   When the usage heat amount calculated by the usage heat amount calculation means is the usage heat amount exceeding the predetermined heat amount, from the predetermined time before the end time of the midnight power time zone, which is the predetermined heat amount, to the end time of the midnight power time zone The amount of heat that can be given to the hot water when the heat pump unit performs the boiling operation at the rated heating capacity in a time period of time is subtracted from the amount of heat used to calculate the difference heat amount, and further the heating capacity of the heat pump unit The difference capacity calorific value, which is the difference in the amount of heat that can be given to hot water per unit time when the heating operation is performed at a temperature higher than the rated value and when the heating capacity of the heat pump unit is heated at the rated value. Calculate and use the differential capacity calorie over the time to boil the heat corresponding to the differential calorific value with the differential capacity calorie, and the differential capacity calorie Boiling operation is performed in a state where the heating capacity of the heat pump unit is raised above the rated value within the time equal to or less than the time for boiling the amount of heat corresponding to the quantity, and then the heating capacity of the heat pump unit is returned to the rated value and heated up. The heat pump type hot water heater according to claim 1, wherein the operation is performed.

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