JP2012229843A - Storage type hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of an excessive residual hot water amount or running-out of hot water, which occurs because a certain extra amount of hot water is included in a necessary amount of hot water so as to prevent running-out of hot water.SOLUTION: A storage type hot water supply device includes a hot water storage tank 1 for storing hot water, a water supply pipe 2 for supplying water to the hot water storage tank, a hot water outlet pipe 4 for outputting hot water from the hot water storage tank 1, heating means 29 for heating the hot water of the hot water storage tank 1, hot water storage amount detecting means 22 for detecting the amount of hot water in the hot water storage tank 1, and control means 40 for controlling the heating means 29 so as to boil a necessary hot water storage amount Qs at a specific time zone. The control means 40 detects a residual hot water amount in the hot water storage tank 1 by the hot water storage amount detecting means 22 at the start of the specific time zone or at specific time after the start of the specific time zone, stores a residual hot water amount of each day in a past prescribed period, increases/decreases the necessary hot water storage amount Qs according to the residual hot water amount, and adds a value corresponding to the variance degree σ2 of the residual hot water amount in the past prescribed period to correct the necessary hot water storage amount Qs.

Description

  The present invention relates to a hot water storage type hot water supply device that boils hot water in a hot water storage tank in a specific time zone.

  Conventionally, in this type of hot water storage type hot water supply apparatus, a hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a hot water discharge pipe for discharging hot water from the hot water storage tank, and heating means for heating the hot water in the hot water storage tank And a control means for controlling the heating means so as to boil a required hot water storage amount corresponding to the hot water supply amount in the midnight time zone, and storing the hot water supply amount for the past predetermined period, There is one in which the required amount of stored hot water is determined according to the average value and the standard deviation (Patent Document 1).

JP 2008-89208 A (paragraph 0039)

  However, in this conventional one, the required hot water storage amount obtained by adding a value corresponding to the standard deviation to the average value of the hot water supply amount includes a certain amount of hot water in order to suppress hot water shortage. Therefore, if you set a certain amount of margin, there will be too much remaining hot water in the hot water tank at the end of the day, and if you set a certain amount of margin less, it may run out during the day. There was a problem.

  Accordingly, in order to solve the above problems, the present invention provides a hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a hot water discharge pipe for discharging hot water from the hot water storage tank, and hot water for the hot water storage tank. A heating means for heating the hot water, a hot water storage amount detecting means for detecting the amount of hot water stored in the hot water storage tank, and a control means for controlling the heating means so as to boil the required hot water storage amount Qs in a specific time zone, The control means detects the remaining hot water amount in the hot water storage tank by the hot water storage amount detection means at a specific time after the start of the specific time zone or after the start of the specific time zone, and the remaining hot water amount per day in the past predetermined period. The required hot water storage amount Qs is increased or decreased according to the remaining hot water amount, and the required hot water storage amount Qs is corrected by adding a value according to the degree of variation σ2 of the remaining hot water amount in the past predetermined period. .

  Further, in claim 2, a hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a hot water discharge pipe for discharging hot water from the hot water storage tank, heating means for heating hot water in the hot water storage tank, and the hot water storage tank The hot water storage amount detecting means for detecting the hot water storage amount in the inside, the hot water supply amount for each day in the past predetermined period are stored, and the heating means is controlled to boil the required hot water storage amount Qs according to the hot water supply amount in a specific time zone. The control means detects the remaining hot water amount in the hot water storage tank by the hot water storage amount detection means at a specific time at the start of the specific time zone or after the start of the specific time zone, The amount of remaining hot water per day in the period is stored, and the learning hot water amount Q1 according to the average value X of the hot water supply amount in the past predetermined period and the variation degree σ1 based on the stored daily hot water supply amount in the past predetermined period Remember And to calculate the required amount of hot water storage Qs by adding the margin hot water Q2 corresponding to the average value Y of the remaining hot water in the past predetermined period and the variation degree σ2 based on the amount of hot water per day given period removed by.

  According to a third aspect of the present invention, there is provided a bath circuit for heating the bath water using the hot water in the hot water storage tank as a heat source.

  Moreover, in Claim 4, in any one of Claims 1-3, the said heating means returns the hot water taken out from the said hot water storage tank to the said hot water tank upper part, and the heating circulation circuit in the middle of this heating circuit The heat pump heater is provided and a heating circulation pump provided in the middle of the heating circulation circuit.

  According to the present invention, since the necessary hot water storage amount Qs is corrected or calculated according to the daily remaining hot water amount and the degree of variation, it depends on the outside air temperature, the hot water temperature, the amount of boiling water, the time until the hot water is actually supplied, etc. An appropriate necessary hot water storage amount Qs can be boiled in consideration of the amount of heat released from the hot water storage tank and daily variations thereof, and it is possible to improve the energy saving by preventing excessive hot water and running out of hot water.

  In addition, in the case with a bath circuit that heats the bath water using hot water in the hot water storage tank as the heat source, the amount of heat consumed by heating the bath water is reflected in the remaining hot water volume, so the outside air temperature, hot water temperature, and boiling water volume In addition to the amount of heat released from the hot water storage tank according to the time until hot water is actually supplied and the daily variation, it is appropriate to take into account the amount of heat consumed for heating the bathtub water and the daily variation. The necessary amount of stored hot water Qs can be boiled up, and the bath water can be heated as much as necessary, and it is possible to prevent excessive hot water and running out of hot water and improve energy saving.

The schematic block diagram of the hot water storage type hot water supply apparatus of one Embodiment of this invention Flowchart explaining boiling operation of the same embodiment The figure explaining the relationship between the amount of remaining hot water of the past predetermined period and variation degree of the same embodiment The flowchart explaining the boiling operation of another embodiment of this invention

Next, a hot water storage type hot water supply apparatus according to an embodiment of the present invention will be described with reference to the drawings.
1 is a hot water storage tank for storing hot water (in this case, a tank volume of 370 L), 2 is a water supply pipe for supplying water to the hot water storage tank 1, 3 is a pressure reducing valve provided in the water supply pipe 2 for reducing the water supply pressure, 4 is from the upper part of the hot water storage tank 1 A hot water discharge pipe 5 for discharging hot water is provided in the hot water discharge pipe 4 to release overpressure, 6 is a water supply bypass pipe branched from the water supply pipe 2 on the downstream side of the pressure reducing valve 3, and 7 is hot water from the hot water discharge pipe 4. A hot water supply mixing valve that mixes water from the water supply bypass pipe 6, 8 is a hot water supply pipe that supplies hot water from the hot water supply mixing valve 7, 9 is a hot water temperature sensor provided in the hot water supply pipe 8, and 10 flows through the hot water supply pipe 8. A hot water supply flow sensor for detecting the flow rate, 11 is a water supply temperature sensor for detecting the temperature of the water supply, and 12 is a hot water tap.

  13 is a bathtub, 14 is a bath heat exchanger provided in the upper part of the hot water storage tank 1, 15 is a bath circulation circuit in which bath water is circulated between the bathtub 13 and the bath heat exchanger 14, and 16 is a bath circulation. The bottom heat exchanger 14, the bottom circulation circuit 15, and the bottom circulation pump 16 form a bottom circuit in a bottom circulation pump provided in the middle of the circuit 15.

  17 is a bath return temperature sensor that detects the temperature of the bath water returning from the bath 13 to the bath heat exchanger 14, 18 is a bath temperature sensor that detects the temperature of the bath water going from the bath heat exchanger 14 to the bath 13, and 19 is A water level sensor for detecting the water level in the bathtub 13 by pressure, 20 is a hot water pipe branched from the hot water supply pipe 8 and connected to the bath circulation circuit 15, and 21 is a hot water solenoid valve for opening and closing the hot water pipe 20. .

  Reference numeral 22 denotes a hot water storage temperature sensor serving as a hot water storage amount detecting means provided on the upper and lower sides of the hot water storage tank 1 to detect the hot water storage temperature of each part to detect the hot water storage amount. Here, the hot water storage temperature sensor 22a is 30L. 22b is 80L, hot water storage temperature sensor 22c is 130L, hot water storage temperature sensor 22d is 180L, hot water storage temperature sensor 22e is 230L, hot water storage temperature sensor 22f is 280L, and hot water storage temperature sensor 22g detects the hot water storage temperature of 330L. .

  23 is a compressor that compresses the refrigerant, 24 is a hot water supply heat exchanger that exchanges heat between the refrigerant and hot water, 25 is an expansion valve that decompresses and expands the refrigerant, 26 is an air heat exchanger as an evaporator that evaporates the low-temperature refrigerant, 27 Is a blower fan that blows outside air to the air heat exchanger 26. The compressor 23, the hot water supply heat exchanger 24, the pressure reducing means 25, and the air heat exchanger 26 are connected in a ring shape by a refrigerant pipe 28, and a heat pump heater 29 is constituted.

  A heating circulation circuit 30 connects the lower part of the hot water storage tank 1 and the inlet of the hot water supply heat exchanger 24, connects the outlet of the hot water supply heat exchanger 24 and the upper part of the hot water storage tank 1, and 31 is the inlet side of the hot water supply heat exchanger 24 A heating circulation pump provided in the heating circulation circuit 30 for circulating hot water extracted from the lower part of the hot water storage tank 1 to the upper part of the hot water storage tank 1 through the hot water supply heat exchanger 24, and 32 indicates the temperature of the hot water flowing into the hot water supply heat exchanger 24. An incoming water temperature sensor 33 to detect, a boiling temperature sensor 33 to detect the temperature of hot water flowing out from the hot water supply heat exchanger 24, and an outside air temperature sensor 34 to detect the outside air temperature.

  The heat pump heater 29, the heating circulation circuit 30, and the heating circulation pump 31 constitute heating means for boiling the hot water in the hot water storage tank 1, and a predetermined heating capacity W (here, 4). The compressor 23, the pressure reducing means 25, the blower fan 27, and the heating circulation pump 31 are controlled so as to operate at 5 kW). The hot water taken out from the lower part of the hot water storage tank 1 is heated to the target boiling temperature Ts to store the hot water. The amount of hot water to be boiled can be freely controlled because the upper part of the tank 1 is returned to the laminated state.

  Reference numeral 35 denotes a remote controller for performing hot water supply temperature and various necessary settings, a display unit 36 for displaying hot water set temperature and bath set temperature, a temperature setting switch 37 for setting hot water set temperature and bath set temperature, and bathtub 13. A bath switch 38 for performing a heat retaining operation for a predetermined heat retaining time following the filling of a predetermined amount of hot water to the water and a reheating switch 39 for performing a reheating operation for heating the bath water are provided.

  Reference numeral 40 denotes a control means for controlling the operation of the hot water storage type hot water supply apparatus, which stores a program for controlling the operation in advance and has a calculation, comparison, storage function, and count function. Detected by a flow rate sensor 10, a feed water temperature sensor 11, a bath return temperature sensor 17, a bath temperature sensor 18, a water level sensor 19, a hot water storage temperature sensor 22 a to 22 g, an incoming water temperature sensor 32, a boiling temperature sensor 33, and an outside air temperature sensor 34. The value to be input is input, and the driving of the hot water mixing valve 7, the bath circulation pump 16, the hot water solenoid valve 21, the compressor 23, the expansion valve 25, the blower fan 27, and the heating circulation pump 31 is controlled, and the boiling operation and hot water supply are controlled. It controls the operation, the bath heating operation, etc., and is connected to the remote controller 35 so as to be communicable.

  The control means 40 includes a hot water supply amount storage means 41 for accumulating and storing the amount of hot water supply from the hot water storage tank 1 every day over the past predetermined period (here 7 days), and at the start of a midnight time zone as a specific time zone or The amount of remaining hot water in the hot water storage tank 1 detected by the hot water storage temperature sensors 22a to 22g at a specific time (here, 2:00 in the middle of the night) when no hot water is supplied after the start of the midnight time zone is over the past predetermined period (here 7 days). A remaining hot water amount storage means 42 for accumulating and storing each day is provided.

<Hot-water supply operation>
Next, when the hot-water tap 12 is opened and the hot-water supply flow sensor 10 detects a flow rate that is greater than or equal to the amount that hot water supply can be started, the control means 40 sets the hot-water supply temperature detected by the hot-water supply temperature sensor 9 to the hot-water supply set temperature set by the remote controller 35. Then, the opening of the hot water supply mixing valve 7 is adjusted so that hot water from the hot water supply pipe 4 and water from the hot water supply bypass pipe 6 are mixed to supply hot water at a hot water supply set temperature.

  At this time, the control means 40 is a hot water storage tank converted into a constant temperature (43 ° C. in this case) from the hot water temperature detected by the hot water temperature sensor 11, the hot water flow rate detected by the hot water flow sensor 11, and the hot water set temperature. The hot water supply amount from 1 is accumulated and stored in the hot water supply amount storage means 41. Here, the hot water supply amount is accumulated in units of one day, and is stored for a past predetermined period (here, 7 days).

  When the flow rate detected by the hot water supply flow rate sensor 10 decreases to a flow rate less than an amount that can be regarded as a hot water supply stop, for example, when the hot water tap 12 is closed, the control means 40 ends the adjustment of the opening degree of the hot water supply mixing valve 7 and supplies hot water. finish.

<Water filling operation>
The case where the bath switch 38 of the remote controller 35 is turned on will be described. The control means 40 opens the hot water solenoid valve 21, and the hot water temperature detected by the hot water temperature sensor 9 is the same as the bath set temperature set by the remote controller 35. The flow rate integrated value after opening the hot water solenoid valve 21 detected by the hot water supply flow rate sensor 10 is adjusted in advance by adjusting the opening of the hot water supply mixing valve 7 so that the hot water of the bath set temperature is filled. When the amount of hot water set in step S3 is reached, the hot water solenoid valve 21 is closed.

  At this time, the control means 40 is a hot water storage tank converted to a constant temperature (here 43 ° C.) from the hot water temperature detected by the hot water temperature sensor 11, the hot water flow rate detected by the hot water flow sensor 11, and the bath set temperature. The hot water supply amount from 1 to the bathtub 13 is added to the previous hot water supply amount and accumulated and stored in the hot water supply amount storage means 42.

<Insulation operation>
When the hot water filling operation is completed, the control means 40 performs a heat insulation operation for a predetermined heat insulation time (for example, 2 hours). In this heat insulation operation, the bath circulation pump 16 is periodically driven to check the bath water temperature. If the bath temperature is lower than the bath setting temperature, the bath circulation pump 16 is continuously driven as if bath bath heating is requested, and bath water is set. Heat to temperature. When the bath heating operation is performed with the bath heating request being requested, the control means 40 stores that the bath heating has been performed, and when a predetermined warming time has elapsed since the completion of the hot water filling operation, The heat insulation operation is not performed.

<Casting action>
Further, when the reheating switch 39 of the remote controller 35 is turned on, the control means 40 performs a reheating operation in which the reheating operation is requested and the reheating operation is performed up to the set temperature. When generated, the control means 40 starts driving the bath circulation pump 16, circulates the bath water to the bath heat exchanger 14, and starts a bath heating operation for heating the bath water with the hot water stored in the hot water storage tank 1. The fact that there is a bath heating record is stored, and when the bath return temperature sensor 17 detects the bath set temperature or more, the bath circulating pump 16 is stopped and the bath heating operation is terminated.

<Boiling operation>
Next, the heating operation in the midnight time zone, which is a specific time zone where the power unit price is inexpensive, will be described based on the flowchart of FIG. Here, a description will be given based on a charge system in which the unit price of electricity is cheaper in the midnight time zone from 23:00 to 7:00 the next morning than in other daytime hours, but is not limited to this, for example, from 22:00 to 8:00 the next morning It is also possible to use a fee system with a low-cost late-night time.

  When the current time is 23:00 and the start time of the midnight time zone is reached (Yes in step S1), the control means 40 determines the remaining hot water determination temperature (for example, reliably hot water and bath water based on the detected temperatures of the hot water storage temperature sensors 22a to 22g). The remaining hot water amount Qz converted to a constant temperature (43 ° C.) is calculated by detecting the amount of heat of the remaining hot water at a temperature that can be used for heating (50 ° C.) or higher (step S 2), and stored in the remaining hot water amount storage means integration 42. Here, the amount of remaining hot water is memorized over the past predetermined period (here 7 days) in units of one day.

  And the control means 40 calculates the average hot water supply amount X from the hot water supply amount of the past predetermined period memorize | stored in the hot water supply memory | storage means 41 (step S3), and also shows the variation degree (sigma) 1 of the hot water supply amount for every day. The standard deviation is calculated as a value (step S4), and based on the average hot water supply amount X and the variation degree σ1, here, the variation degree σ1 multiplied by the coefficient A is added to the average hot water supply amount X and converted to a constant temperature (43 ° C.). The amount of learning hot water Q1 is calculated and determined (step S5).

  Next, the control means 40 calculates the average remaining hot water amount Y from the hot water supply amount stored in the remaining hot water amount storage means 42 in the past predetermined period (step S6), and further indicates the variation degree σ2 of the remaining hot water amount every day. A standard deviation is calculated as a value (step S7), and based on the average remaining hot water amount Y and the variation degree σ2, here, a value obtained by subtracting the average remaining hot water amount Y from the fixed hot water amount (20 L in this case) as the minimum amount of hot water to be secured here, The variation degree σ2 multiplied by the coefficient B is added to calculate and determine a surplus hot water amount Q2 (step S8).

  Then, the control means 40 adds the marginal hot water amount Q2 determined in step S8 to the learned hot water amount Q1 determined in step S5, and calculates the necessary hot water storage amount Qs required for one day from the end of this midnight time zone. Determine (step S9).

  Next, the control means 40 determines the target boiling temperature Ts 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 34 (step S10). Here, the target boiling temperature Ts is 75 ° C. when the outside air temperature Ta is less than 10 ° C., and 70 ° C. when the outside air temperature Ta is 10 ° C. or more.

  Instead of the relationship table data of the outside air temperature Ta and the target boiling temperature Ts, table data of the feed water temperature Tw and the target boiling temperature Ts is stored in advance in the control means 40. In step S3, the feed water temperature sensor 11, The target boiling temperature Ts may be determined based on the feed water temperature Tw detected by the lower hot water storage temperature sensor 22g or the incoming water temperature sensor 32.

  Then, the control means 40 calculates the target boiling amount V by dividing the value obtained by reconverting the necessary hot water storage amount Qs into the heat amount by the value obtained by subtracting the feed water temperature Tw from the target boiling temperature Ts (step S11). At this time, the target boiling amount V is corrected according to the relationship with the position of the hot water storage temperature sensors 22a to 22g, and when the calculated value is 130L or less, 130L, 130L or more, 180L or less, 180L, 180L or more, less than 230L. 230L, more than 230L, less than 280L, 280L, more than 280L, 330L is corrected and determined to be the target boiling amount V, and hot water storage temperature sensors 22c to 22g corresponding to the determined target boiling amount V are determined. Any one of them is used as a hot water storage temperature sensor for determining completion of boiling.

  Next, the control means 40 detects the remaining hot water volume Vz where there is hot water at a temperature not necessary for boiling (step S12), subtracts the remaining hot water volume Vz from the target boiling amount V, and heats up in this midnight time zone. A necessary boiling amount Vp is calculated (step S13).

  Then, the control means 40 multiplies the required boiling amount Vp by the value obtained by subtracting the feed water temperature Tw from the target boiling temperature Ts, and further divides by the constant heating capacity of the heat pump heater 29 (here 4.5 kW). Then, the boiling time is calculated, and the boiling start time (peak shift time) is calculated by calculating backward from the end time of the midnight time zone (step S14).

  When the current time becomes the peak shift time (Yes in step S15), the heat pump heater 29 and the heating circulation pump 31 are started to start the boiling operation at the target boiling temperature Ts determined in step S10. Then, the water taken out from the lower part of the hot water storage tank 1 is heated to the hot water at the target boiling temperature Ts, returned from the upper part of the hot water storage tank 1 and stored in a stacked form (step S16).

  The hot water storage temperature sensors 22c to 22g corresponding to the target boiling amount V determined in step S11 detect a prescribed boiling completion temperature (for example, 65 ° C.), or the incoming water temperature sensor 32 has a heating upper limit temperature (for example, 55 ° C.). ) Whether boiling is completed by detecting the above (step S17), or when the current time reaches 7:00, which is the end time of the midnight time zone (step S18), the heat pump heater 29 and the heating circulation pump 31 Is stopped and the boiling operation is terminated (step S19), and the flow of the boiling operation is terminated (step S20).

  In this way, according to the average value X of the hot water supply amount daily and the daily variation degree σ1 of the hot water supply amount, according to the learning hot water amount Q1, the average value Y of the daily remaining hot water amount, and the daily variation degree σ2 of the remaining hot water amount. Since the required hot water storage amount Qs is calculated from the surplus hot water amount Q2, the amount of heat released from the hot water storage tank according to the level of the outside air temperature and hot water temperature, the amount of boiling water, the length of time until the hot water is actually supplied, etc. In addition, it is possible to boil an appropriate required hot water storage amount Qs in consideration of daily variations, and it is possible to prevent excessive hot water and running out of hot water and improve energy saving performance.

  As shown in FIG. 3 (a), when the degree of variation σ2 of the remaining amount is small, it is possible to approach the fixed amount of hot water as a minimum amount of hot water to ensure the spare amount of hot water Q2 of the necessary hot water storage amount Qs. Thus, wasteful boiling can be extremely reduced and excess hot water can be prevented. On the other hand, as shown in FIG. 3B, when the degree of variation σ2 of the remaining hot water amount is large, the extra hot water amount Q2 is set in consideration of the variation in the necessary hot water storage amount Qs, and the required hot water storage that matches the usage situation. Since the amount Qs is boiled, it is possible to prevent occurrence of hot water shortage.

  Moreover, in the thing provided with the bath circuit which heats the bathtub water using the hot water in the hot water storage tank 1 as a heat source, the amount of heat consumed by the heating of the bathtub water is reflected in the amount of remaining hot water. In addition to the amount of heat dissipated from the hot water storage tank according to the amount of boiling water, the length of time until the hot water is actually supplied, and daily variations, the amount of heat consumed for bath water heating and the daily Taking into account variations in water, it is possible to boil the appropriate required hot water storage amount Qs, ensure that the bath water is heated as much as necessary, and prevent excessive hot water and running out of hot water, improving energy savings can do.

Next, a hot water storage type hot water supply apparatus according to another embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same thing as previous embodiment, and the description is abbreviate | omitted.
In the previous embodiment, most of the required hot water storage amount Qs was determined based on the hot water supply amount. However, in this embodiment, the required hot water storage amount Qs is increased or decreased according to the remaining hot water amount, and the remaining hot water amount in the past predetermined period is also increased. The required amount of stored hot water Qs is corrected by adding a surplus amount of hot water corresponding to the variation degree σ2.

<Boiling operation>
Next, the heating operation in the midnight time zone, which is a specific time zone where the power unit price is cheap, will be described based on the flowchart of FIG. When the current time is 23:00 and the start time of the midnight time zone is reached (Yes in step S21), the control means 40 determines the remaining hot water determination temperature (for example, surely hot water and bath water based on the detected temperatures of the hot water storage temperature sensors 22a to 22g). The remaining hot water amount Vz converted to a constant temperature (43 ° C.) is calculated by detecting the amount of heat of the remaining hot water that is equal to or higher than the temperature that can be used for heating (50 ° C.) (step S 22), and stored in the remaining hot water storage means 42. Here, the amount of remaining hot water is memorized over the past predetermined period (here 7 days) in units of one day.

  Next, the control means 40 calculates a standard deviation as a value indicating the variation degree σ2 of the remaining hot water amount stored in the remaining hot water amount storage means 42 for each day (step S23).

  And the control means 40 discriminate | determines whether the amount of remaining hot water of the day detected by step S22 is 30L or more, or is less than 10L (step S24), and if the amount of remaining hot water is 30L or more, it will progress to step S25. The required hot water storage amount Qs up to the previous day is reduced by 10L, and if the remaining hot water amount is less than 10L, the process proceeds to step S26 and the required hot water storage amount Qs up to the previous day is increased by 10L. Here, although the required hot water storage amount Qs is increased or decreased according to the remaining hot water amount on the day, the required hot water storage amount Qs may be increased or decreased according to the average value of the remaining hot water amount during the past predetermined period.

  Next, the control means 40 adds the required hot water storage amount Qs by multiplying the necessary hot water storage amount Qs determined in step S25 or S26 by the coefficient C to the variation degree σ2 of the remaining hot water amount calculated in step S23. Is corrected (step S27). Subsequent boiling operations are the same as those in FIG. 2, and thus the same reference numerals are given and description thereof is omitted.

  In this way, the required hot water storage amount Qs is increased or decreased according to the daily remaining hot water amount, and further, the necessary hot water storage amount Qs is corrected to increase according to the variation degree σ2 of the daily remaining hot water amount. It is possible to boil up the necessary required hot water storage amount Qs in consideration of the amount of heat released from the hot water storage tank according to the height, the size of the boiling water, the length of time until the hot water is actually supplied, and the daily variation. It is possible to improve the energy saving by preventing excessive hot water and running out of hot water.

  Moreover, in the thing provided with the bath circuit which heats the bathtub water using the hot water in the hot water storage tank 1 as a heat source, the amount of heat consumed by the heating of the bathtub water is reflected in the amount of remaining hot water. In addition to the amount of heat dissipated from the hot water storage tank according to the amount of boiling water, the length of time until the hot water is actually supplied, and daily variations, the amount of heat consumed for bath water heating and the daily Taking into account variations in water, it is possible to boil the appropriate required hot water storage amount Qs, ensure that the bath water is heated as much as necessary, and prevent excessive hot water and running out of hot water, improving energy savings can do.

  In these embodiments, the standard deviation of the hot water supply amount or the remaining hot water amount is used as the degree of variation, but the present invention is not limited to this, and dispersion may be used, but the standard deviation is more preferable. Moreover, although the necessary hot water storage amount Qs is described as a hot water amount converted to 43 ° C., the hot water amount and the heat amount are substantially the same, and even if calculated as the necessary heat amount, they are the same.

  In detecting the amount of hot water, the remaining hot water determination temperature is set to a fixed temperature. However, it may be changed depending on the situation. The fixed temperature at which hot water can be supplied is 43 ° C, etc. In the situation where bath water heating is frequently performed, the fixed temperature 55 ° C at which bath water can be heated reliably may be set, and the remaining hot water judgment temperature is changed. In such a case, since there is no consistency with the stored value of the remaining hot water amount so far, it is preferable to temporarily reset the storage of the remaining hot water amount.

  In addition, the bath heat exchanger 14 is arranged in the hot water storage tank 1 as the bath circuit, but the present invention is not limited to this, and the bath heat exchanger 14 includes a primary flow path and a secondary flow path such as a plate heat exchanger. A configuration in which the hot water extracted from the hot water storage tank 1 is circulated in the primary flow path of the bath heat exchanger and the bathtub water is circulated in the secondary flow path of the bath heat exchanger. It is good.

  In addition, when there is stored a bath heating record based on the stored contents of the bath heating record, one of the learning hot water amount Q1 and the necessary hot water storage amount Qs and / or the target boiling temperature Ts may be increased. It ’s good.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Water supply pipe 4 Hot water discharge pipe 14 Bath heat exchanger (flow circuit)
15 bath circuit (bath circuit)
16 bath circulation pump (bath circuit)
22 Hot water storage temperature sensor (hot water storage amount detection means)
29 Heat pump heater (heating means)
30 Heating circulation circuit (heating means)
31 Heating circulation pump (heating means)
40 Control means

Claims (4)

  A hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a hot water discharge pipe for discharging hot water from the hot water storage tank, heating means for heating the hot water in the hot water storage tank, and the amount of hot water stored in the hot water storage tank are detected. What is provided with hot water storage amount detection means and control means for controlling the heating means so as to boil the required hot water storage amount Qs in a specific time zone, the control means at the start of a specific time zone or the start of a specific time zone The remaining hot water amount in the hot water storage tank is detected by the hot water storage amount detection means at a specific time later, the remaining hot water amount for each day in the past predetermined period is stored, and the required hot water storage amount Qs is increased or decreased according to the remaining hot water amount. In addition, the hot water storage type hot water supply apparatus is characterized in that the necessary hot water storage amount Qs is corrected by adding a value corresponding to the degree of variation σ2 of the remaining hot water amount in the past predetermined period.   A hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a hot water discharge pipe for discharging hot water from the hot water storage tank, heating means for heating the hot water in the hot water storage tank, and the amount of hot water stored in the hot water storage tank are detected. A hot water storage amount detection means, and a control means for storing the hot water supply amount per day for a predetermined period in the past and controlling the heating means so as to boil the required hot water storage amount Qs according to the hot water supply amount in a specific time zone. The control means detects the amount of hot water in the hot water storage tank by the hot water storage amount detection means at a specific time after the start of the specific time zone or after the start of the specific time zone, and The amount of remaining hot water is stored, and the past stored in the learning hot water amount Q1 corresponding to the average value X of the hot water supply amount in the past predetermined period and the variation degree σ1 based on the stored daily hot water supply amount in the past predetermined period. One day for a specified period The hot water storage type hot water supply apparatus is characterized in that the required hot water storage amount Qs is calculated by adding the surplus hot water amount Q2 corresponding to the average value Y of the remaining hot water amount in the past predetermined period based on the remaining hot water amount and the variation degree σ2. .   The hot water storage type hot water supply apparatus according to claim 1 or 2, further comprising a bath circuit that heats bathtub water using hot water in the hot water storage tank as a heat source.   The heating means includes a heating circulation circuit for returning 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 heat pump heater provided in the middle of the heating circulation circuit, and heating provided in the middle of the heating circulation circuit. It is comprised with the circulation pump, The hot water storage type hot-water supply apparatus as described in any one of Claims 1-3 characterized by the above-mentioned.

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