JP5859797B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water supply apparatus including a hot water storage tank that can store hot water heated in advance by a heating means, and particularly relates to optimum control of the heating means.

  Conventionally, many hot water supply apparatuses using a heat pump as a heating means have been proposed. Hot water storage water heaters using heat pumps are generally small for home use, but in recent years, they have also been adopted for commercial use in public baths and so-called spas (relaxation facilities centered on hot springs). Has been.

  For commercial hot water supply, immediate hot water supply is required. Therefore, for example, a circulation type hot water supply apparatus including a heat pump, a hot water storage tank that stores hot water heated by the heat pump, and a circulation channel that circulates between the hot water storage tank and the hot water supply unit is employed (for example, , See Patent Document 1).

  In the hot water supply apparatus of Patent Document 1, since the heat pump is used as the heating means, the hot water stored in the hot water storage tank can be heated at a running cost of about 1/3 as compared with a normal electric water heater. Since the heat pump is operated using electric power, the running cost can be greatly reduced.

JP 2005-30642 A

  However, in the configuration of Patent Document 1, since the temperature of the hot water layer for hot water supply in the hot water storage tank is always kept constant, the heat pump must always be operated according to the hot water supply situation, and the efficiency is improved. It cannot be said that good heat pump control is performed. In other words, depending on the hot water supply situation, the operation time of the heat pump other than late-night power becomes longer, and hot water is generated and stored more than necessary, which may increase running costs such as electricity bills. On the other hand, when the hot water supply load is large during the daytime, the boiling operation cannot be followed and the hot water is not sufficiently generated and stored, which may cause the hot water to run out.

  The present invention has been made in order to solve the above problems, and by efficiently operating a heat pump that is a heating means, a hot water supply device that can reduce energy consumption and reduce the risk of running out of hot water while reducing running costs. It is intended to provide.

(1) Heating means for heating water to make hot water, hot water obtained by the heating means and a hot water storage tank for storing water supplied from a water supply channel, and provided in the hot water storage tank, and stored in the hot water storage tank A plurality of hot water storage temperature sensors for measuring the temperature of the hot water, a water supply temperature sensor provided in the water supply passage for measuring the temperature of water supplied from the water supply passage to the hot water storage tank, and the operation of the heating means. In the hot water supply apparatus comprising the control means for controlling, the control means is based on the measured values of the plurality of hot water storage temperature sensors and the hot water temperature sensor and the hot water storage capacity of the hot water storage tank in predetermined time units. Calculated by the stored heat amount calculating unit for calculating the stored heat amount of the hot water storage tank, and the stored heat amount calculating unit for the stored heat amount before the predetermined time from the current time calculated by the stored heat amount calculating unit. Subtracting the stored heat amount at the current time and adding the heating heat amount by the heating means for the predetermined time to calculate the hot water supply load heat amount for the predetermined time unit, and further, the calculated hot water supply for the predetermined time unit A hot water supply heat quantity calculation unit for calculating a daily hot water supply load heat quantity from the load heat quantity, a hot water supply heat quantity in units of the predetermined time calculated by the hot water supply load heat quantity calculation unit, and a hot water supply heat quantity for storing the daily hot water load heat quantity From the storage unit and the data of the hot water supply load heat amount in units of the predetermined time and the hot water supply load heat amount stored in the hot water supply load heat amount storage unit, the daily hot water supply load heat amount becomes a predetermined value or less in a predetermined period. Excluding day data, the average value of the daily hot water load calorific value in the predetermined period and the hot water supply negative for each time period divided by the predetermined time in the predetermined period An average value of the hot water supply load calorie value calculating unit for calculating an average value of the heat quantity, an average value of the hot water supply load calorie value for each day calculated by the hot water supply load calorie value average value calculating unit, and an average value of the hot water supply load calorie value for each time period Based on the required hot water storage calorific value calculation unit for calculating the required hot water storage calorific value for each time zone, and based on the required hot water storage calorific value calculated by the required hot water storage calorie calculation unit, the trigger for starting the operation of the heating means, An operation start determination unit that determines an operation start trigger value that determines an operation stop trigger value that triggers a stop of the heating unit based on the determined operation start trigger value, and the plurality of hot water storage temperature sensors Of the hot water storage unit in a specific time unit shorter than the predetermined time based on the difference between the measured value of the measured value of the hot water tank and the measured value of the feed water temperature sensor and the hot water storage capacity of the hot water storage tank. A current hot water storage heat amount calculation unit that calculates a current hot water storage heat amount of the tank, and the required hot water storage heat amount is a value obtained by multiplying a value of a reverse hot water supply load calculated for each time zone by a value greater than 1, or It is a value obtained by adding a predetermined value to the value of the reverse calculation hot water supply load, and the reverse calculation hot water supply load is the average value of the daily hot water supply load heat amount for the start time zone, after the start time zone. The time zone is a value obtained by subtracting an average value of the hot water supply load calorific value for each time zone in the immediately preceding time zone from the value of the reverse calculation hot water load in the immediately preceding time zone, and the time determined by the operation trigger determining unit The start and stop of the operation of the heating means is controlled based on the value of the operation start trigger and the value of the operation stop trigger and the current hot water storage heat amount calculated by the current hot water storage heat amount calculation unit.

  (2) In the hot water supply apparatus of the above (1), the operation trigger determination unit includes an average value of the measured values of the water temperature sensor for each day in the predetermined period, and a part of the time closest to the current time in the predetermined period. By calculating a correction coefficient based on the average value of the measured values of the feed water temperature sensor for a period, and multiplying the calculated correction coefficient by the required hot water storage heat amount calculated by the required hot water storage heat amount calculation unit. The operation start trigger value is calculated.

  (3) In the hot water supply apparatus according to (1) or (2), when the current hot water storage heat amount calculation unit detects a measurement value less than a specified value in the measurement values of the plurality of hot water storage temperature sensors, the current hot water storage heat amount calculation unit is less than the specified value. The amount of heat held by the measured value is excluded as invalid, and the current amount of stored hot water in the hot water storage tank is calculated.

  According to the present invention, the heating means can be efficiently controlled according to the required amount of hot water supply, so that a hot water supply apparatus with a low running cost can be obtained.

It is a schematic structure figure showing the hot-water supply device of one embodiment of the present invention. It is a schematic block diagram which shows the control means of the hot water supply apparatus of one Embodiment of this invention. It is explanatory drawing which shows the measurement data of the hot water supply load according to time of one Embodiment of this invention. It is explanatory drawing which shows the average data of the daily hot water supply load of one Embodiment of this invention. It is explanatory drawing which shows the numerical value of the average data of the daily hot water supply load of one Embodiment of this invention. It is explanatory drawing which shows the hot water supply load data of the predetermined time unit in the predetermined period of one Embodiment of this invention. It is a figure for demonstrating control of the heat storage amount and heating means of the hot water storage tank in one day of one Embodiment of this invention.

  Hereinafter, a hot water supply apparatus according to an embodiment of the present invention will be specifically described with reference to the drawings. In addition, although the hot water supply apparatus in this embodiment can be used suitably for a hot water supply in a building, a factory, or a public bath facility etc., for example, it can be applied to any place as long as a hot water supply is required.

  FIG. 1 is a schematic configuration diagram showing a hot water supply apparatus according to this embodiment of the present invention.

  As shown in FIG. 1, the hot water supply apparatus includes a vertical hot water storage tank 10 and a heat pump 40 as a heating means that heats water into hot water. The hot water storage tank 10 has a cylindrical main body 10a, a ceiling portion 10b that constitutes an upper portion of the main body 10a, and a bottom portion 10c that constitutes a lower portion of the main body 10a. Although omitted in FIG. 1 schematically shown, a plurality of legs are provided on the bottom 10c, and the hot water storage tank 10 is provided in an upright state.

  The hot water storage tank 10 is provided with a plurality of hot water storage temperature sensors that measure the temperature of the hot water stored in the hot water storage tank 10. The plurality of hot water storage temperature sensors are arranged at substantially equal intervals with respect to the hot water storage tank 10 in accordance with the hot water storage capacity V [L: liter] which is the internal volume of the hot water storage tank 10 over substantially the entire vertical direction.

  In the present embodiment, as shown in FIG. 1, nine hot water storage temperature sensors T1, T2, T3, T4, T5, T6, T7, T8, and T9 are provided for the hot water storage tank 10. That is, in the case of this embodiment, nine water temperatures are measured for hot water in the hot water storage tank 10.

  Although details will be described later, the amount of heat held in the hot water storage tank 10 is calculated based on the measured values of the hot water storage temperature sensors T1 to T9 provided in the hot water storage tank 10, the measured values of the hot water temperature sensor T12 described later, and the hot water storage capacity V. Is done.

  A water supply path 30 is connected to the bottom 10 c of the hot water storage tank 10. The water supply channel 30 is a water supply channel that supplies water such as tap water from a water supply port 31. Water is pressurized and supplied into the hot water storage tank 10 through the water supply passage 30. The inside of the hot water storage tank 10 is maintained in a pressurized state by the pressure of water supplied from the water supply passage 30. Further, the water supply passage 30 is provided with a water supply temperature sensor T12 for measuring the temperature of the water supplied into the hot water storage tank 10.

  The bottom portion 10c of the hot water storage tank 10 is connected to a start end portion serving as an upstream end portion of the intake pipe 51, and a terminal end portion serving as a downstream end portion of the intake pipe 51 is connected to a water inlet of the heat pump 40. . The stored water in the hot water storage tank 10 is taken in by the intake pipe 51, led to the heat pump 40, and heated by the heat pump 40.

  The outlet of the heat pump 40 is connected to a start end serving as an upstream end of the pouring pipe 52, and a terminal end serving as a downstream end of the pouring pipe 52 is a ceiling portion of the hot water storage tank 10. 10b. The hot water pipe 52 injects hot water heated to a predetermined temperature (for example, 90 ° C.) by the heat pump 40 into the hot water storage tank 10. That is, the water heated by the heat pump 40 is guided to the hot water storage tank 10 by the pouring pipe 52 and injected into the hot water storage tank 10. As described above, in the hot water supply apparatus of the present embodiment, the hot water storage circulation channel 50 in which the hot water storage tank 10 and the heat pump 40 are connected in communication is formed by the intake pipe 51 and the pouring pipe 52.

  Then, for example, hot water in the hot water storage tank 10 is circulated through the hot water storage tank 10 → the intake pipe 51 → the heat pump 40 → the pouring pipe 52 → the hot water storage tank 10 by using late-night power in a time zone with a small amount of hot water supply such as nighttime. However, it is heated as hot water up to about 90 ° C.

  A circulation flow rate measuring device M is provided in the intake pipe 51 of the hot water storage circulation channel 50. The circulation flow rate measuring device M measures the flow rate of hot water heated by the heat pump 40, that is, the flow rate circulating through the hot water storage circulation channel 50 in units of 1 minute or 1 hour, for example.

  The intake pipe 51 is provided with an incoming water temperature sensor T11. The incoming water temperature sensor T11 measures the temperature of the hot water before being heated by the heat pump 40. In the present embodiment, the incoming water temperature sensor T <b> 11 is provided in the vicinity of the terminal end side of the intake pipe 51. Further, the pouring pipe 52 is provided with a tapping temperature sensor T10. The hot water temperature sensor T10 measures the temperature of hot water after being heated by the heat pump 40. In the present embodiment, the hot water temperature sensor T <b> 10 is provided in the vicinity of the start end side of the pouring pipe 52.

  Based on the measured values of the incoming water temperature sensor T11 and the outgoing hot water temperature sensor T10 and the measured value of the circulating flow rate measuring device M, the heating heat amount of the heat pump 40 per predetermined time (for example, 1 hour) can be calculated.

  A hot water supply pipe 61 constituting a hot water supply circulation channel 60 is connected to the hot water storage tank 10. The hot water supply circulation channel 60 connects the hot water storage tank 10 and the hot water terminal 63 in communication with each other so that hot water stored in the hot water storage tank 10 can be supplied from the hot water terminal 63. The hot water supply pipe 61 supplies hot water stored in the hot water storage tank 10 to a place of use. The starting end portion that is the upstream end portion of the hot water supply pipe 61 is connected to the ceiling portion 10b of the hot water storage tank 10, and the terminal end portion that is the downstream end portion of the hot water supply pipe 61 is connected to the main body 10a of the hot water storage tank 10. It is connected. The hot water outlet terminal 63 is various faucet devices such as a faucet and a shower head, and is used when hot water in the hot water storage tank 10 is used. Hot water in the hot water storage tank 10 is discharged from the hot water outlet terminal 63 by the internal pressure of the hot water storage tank 10 through the hot water supply pipe 61.

  The hot water supply circulation channel 60 is provided with a mixing valve (not shown), and hot water is mixed with hot water and tap water from the water supply port 31 which is cold water through the mixing valve. The circulation channel 60 is always filled with hot water in a temperature range of 60 to 70 ° C., for example. That is, the mixing valve can control the temperature of the hot water circulating in the hot water supply circulation channel 60 by driving the valve.

  The hot water supply circulation channel 60 is provided with a hot water supply circulation channel pump (not shown), and hot water is circulated in the hot water supply circulation channel 60 by driving the hot water supply circulation channel pump. Can do. Therefore, it is possible to immediately supply hot water in response to a request from the hot water outlet terminal 63. Although not shown in the figure, the hot water outlet terminal 63 is provided with a hot water mixing mechanism capable of taking cold water such as tap water into the intake channel inside, and the user can take hot water at a desired temperature at any time. can do.

  As shown in FIG. 1, the hot water supply apparatus of the present embodiment includes a control unit 100 for controlling the operation of the heat pump 40. The control unit 100 functions as a control unit in the present embodiment, and will be described later in detail, and is for efficiently controlling the operation and stop of the heat pump 40.

  Hereinafter, with reference to FIGS. 2-7, the structure of the control part 100 in this embodiment and the various function parts which the control part 100 has are demonstrated. In the following description, the “predetermined time” in the control performed by the control unit 100 is 1 hour, and the “predetermined period” is 1 month. However, as will be described later, the lengths of “predetermined time” and “predetermined period” are not limited to these lengths.

  FIG. 2 is a block diagram showing the configuration of the control unit 100 according to this embodiment. FIG. 3 is an explanatory diagram illustrating an example of measurement data of the hot water supply load according to time according to the present embodiment. FIG. 4 is an explanatory diagram illustrating an example of average data of the daily hot water supply load according to the present embodiment. FIG. 5 is an explanatory diagram showing an example of the numerical value of the average data of the daily hot water supply load of the present embodiment. FIG. 6 is an explanatory diagram showing an example of hot water supply load data in a predetermined time unit in a predetermined period of the present embodiment. FIG. 7 is a diagram for explaining the amount of heat stored in the hot water storage tank in one day and the control of the heating means.

  As shown in FIG. 2, the control unit 100 includes a stored heat amount calculation unit 101, a hot water supply load heat amount calculation unit 102, a hot water supply load heat amount storage unit 103, a hot water supply load heat amount average value calculation unit 104, a necessary hot water storage heat amount calculation unit 105, and an operation trigger. A determination unit 106 and a current hot water storage heat amount calculation unit 107 are included.

  Information from the hot water storage temperature sensors T1 to T9, the hot water temperature sensor T10, the incoming water temperature sensor T11, the feed water temperature sensor T12, and the circulating flow rate measuring device M is input to the control unit 100. The control unit 100 controls the operation of the heat pump 40 based on information input from these sensors and the like.

The stored heat amount calculation unit 101 stores in the hot water storage tank 10 based on the temperature information measured by the hot water storage temperature sensors T1 to T9, the temperature information measured by the feed water temperature sensor T12, and the hot water storage capacity V [L] in the hot water storage tank 10. Calculate the amount of heat. Specifically, the retained heat amount X [MJ: megajoule] of the hot water storage tank 10 is calculated by the following equation (1).
X = {Σ (ti−tk) / 9} × V × 4.186 ÷ 1000 (i = 1, 2,... 9) (1)
Here, ti (i = 1, 2,..., 9) is a temperature [° C.] of hot water in the hot water storage tank 10 measured by each of the hot water storage temperature sensors T1 to T9, and tk is a water temperature sensor T12. The temperature [° C.], the multiplication value 4.186, and the division value 1000 of the water in the water supply channel 30 measured in the above are numerical values for converting the unit of [cal] into [MJ].

  Thus, the amount of heat held in the hot water storage tank 10 is the average value of the difference between the measured values of the nine hot water storage temperature sensors (T1 to T9) and the measured value of the feed water temperature sensor T12, and the hot water storage of the hot water storage tank 10. Calculated by the product of volume V. That is, the temperature difference between the measured value [° C.] as temperature information acquired by each of the nine hot water storage temperature sensors T1 to T9 and the measured value [° C.] as temperature information acquired by the feed water temperature sensor T12 is obtained. Then, the average value of these temperature differences is obtained and the average value of these temperature differences is multiplied by the hot water storage capacity V in the hot water storage tank 10 to calculate the amount of heat retained in the hot water storage tank 10.

  The stored heat amount in the hot water storage tank 10 calculated by the stored heat amount calculation unit 101 is calculated in units of a predetermined time (1 hour). In addition, the calculation timing of the amount of heat stored in the hot water storage tank 10 is every hour on the hour basis.

  Thus, the control unit 100 functions as means for calculating the stored heat amount by the stored heat amount calculating unit 101.

The hot water supply load heat amount calculation unit 102 calculates the amount of heat stored in the hot water storage tank 10 calculated by the stored heat amount calculation unit 101 based on the amount of change in a predetermined time (one hour) and the amount of heat heated by the heat pump 40 in units of one hour. The hot water supply load calorie of 1 hour unit is calculated. Here, the amount of heat Y [MJ] heated by the heat pump 40 in an hour unit is an accumulated value of the amount of heat heated per minute for one hour, and is calculated by the following equation (2).
Y = Σ {M1 × (t10−t11)} × 4.186 ÷ 1000 (2)
Here, M1 is the circulation flow rate [L / min] of the hot water storage circulation channel 50 every predetermined time (1 minute) measured by the circulation flow rate measuring device M, and t10 is a note measured by the tapping temperature sensor T10. The temperature [° C.] of hot water in the hot water pipe 52, t 11 is the temperature [° C.] of water in the water intake pipe 51 measured by the incoming water temperature sensor T 11, the multiplication value 4.186, and the division value 1000 are the above formulas (1 ) And in terms of units.

  When the hot water supply heat quantity calculation unit 102 calculates the hot water supply load heat quantity in units of one hour, first, a difference in the amount of heat held in the hot water storage tank 10 for each hour is obtained. And based on said Formula (2), the amount of heating heat of the heat pump 40 of the hour unit calculated by the measured value of the incoming water temperature sensor T11 and the tapping temperature sensor T10 and the measured value of the circulating flow rate measuring device M is used for the said hot water storage tank. By adding 10 to the difference in the amount of heat held every hour, the hot water supply load heat amount in units of a predetermined time (1 hour) is calculated.

  Moreover, the hot water supply load heat quantity calculation unit 102 calculates the daily hot water supply load heat quantity from the hot water supply load heat quantity in units of a predetermined time (one hour) calculated as described above. Specifically, the hot water supply load heat quantity calculation unit 102 calculates the daily hot water supply load heat quantity by adding the hot water supply load heat quantity in units of a predetermined time (1 hour) for one day, that is, for 24 hours.

  As described above, the hot water supply load heat amount calculation unit 102 of the control unit 100 functions as a unit that calculates the hot water supply load heat amount for each predetermined time unit and the daily hot water supply load heat amount.

  The hot water supply load heat quantity storage unit 103 stores the hot water supply load heat quantity for each hour, which is the calculation result of the hot water supply load heat quantity calculation unit 102. FIG. 3 is a bar graph showing an example of the value of the hot water supply load heat amount. In the example shown in FIG. 3, the hot water supply load calorie | heat amount of the hour unit in the period of 12/01 (Tue)-12/08 (Tue) is shown.

  As shown in FIG. 3, the hot water supply heat quantity storage unit 103 stores the hot water supply heat quantity at each time of each day as the hot water supply heat quantity in units of one hour. In the example shown in FIG. 3, the hot water supply load heat quantity storage unit 103 adds, for each day from 12/01 (Tuesday) to 12/08 (Tuesday), the hot water supply load heat quantity for each hour for 24 hours. It is memorized as the hot water load heat amount.

  As described above, the hot water supply load heat amount storage unit 103 of the control unit 100 functions as means for storing the hot water supply load heat amount for each hour and the daily hot water load heat amount.

  The hot water supply load heat amount average value calculation unit 104 calculates the daily hot water supply load during a predetermined period (one month) from the hot water supply load heat amount of one hour unit and the daily hot water load heat amount stored in the hot water supply load heat amount storage unit 103. Except for the data on the day when the calorific value is less than or equal to the predetermined value, the average value of the daily hot water load calorific value in one month (hereinafter referred to as “daily average value”) and the average for each time period divided by one hour in one month A value (hereinafter referred to as “time zone average value”) is calculated. Here, the predetermined value used in the calculation by hot water supply load heat amount average value calculation unit 104 is not particularly limited, but as the predetermined value, for example, the total amount of heat supply load heat per day for a predetermined period (one month) may be used. An average value of data, a value obtained by subtracting the standard deviation of all data from the average value of all data, or the like is used. In the following description, the predetermined value used in the calculation process by the hot water supply load heat amount average value calculation unit 104 is obtained by subtracting the standard deviation of all data from the average value of all data of the hot water supply load heat amount for each day for a predetermined period (one month). Value.

  FIG. 4 shows the daily hot water load heat amount for one month from December 1 to December 31, which is a predetermined period, as an example of the data of the hot water load heat amount for each day. In FIG. 4, the value of D2 indicated by the alternate long and short dash line is an average value of all data of the hot water supply load heat amount for each day of one month. Specifically, in the present embodiment, the value D2 is 1,978 [MJ], which is the “period average” value of “all data” in the table shown in FIG.

  In addition, the value of D3 indicated by a dotted line in FIG. 4 is a value of the standard deviation 1σ of all the data of the hot water supply heat amount per day for one month from the average value (value D2) of the hot water load heat amount per day of the month. It is the value which subtracted. Specifically, in the present embodiment, “standard deviation” of “all data” is obtained from 1,978 [MJ], which is the “period average” value (value D2) of “all data” in the table shown in FIG. The value obtained by subtracting 862.8 [MJ], that is, 1,978−862.8 = 11, 115.2.

  In the table shown in FIG. 5, each value in the column “exclude holiday data” is a facility in which the hot water supply apparatus according to the present embodiment is installed from all the hot water supply load calorie data for each day shown in FIG. 4. This is a value when holiday data (for example, a factory) is excluded. The hot water supply heat amount of heat as holiday data is obviously smaller than the hot water supply heat amount of other days. Therefore, in the table shown in FIG. 5, the “period average” value of “exclude holiday data” is larger than the “period average” value (1,978) of “all data”. , 136 [MJ]. Obviously small data, such as holiday data, reduces the learning calculation accuracy of the control unit 100 and causes hot water to run out.

  Therefore, in this embodiment, in the calculation of the average value of the hot water supply load heat amount for each day in the predetermined period (one month) by the hot water supply load heat amount average value calculation unit 104, the value of the hot water supply load heat amount for each day in one month is described above. The data that falls below the value of D3 is excluded. That is, in this embodiment, all the data of the hot water supply heat amount per day as described above are used as the “predetermined value” used in the calculation of the average value of the hot water supply heat amount per day by the hot water supply load heat amount average value calculation unit 104. A value (value D3) obtained by subtracting the value of the standard deviation 1σ of all the data on the hot water supply load calorific value for each day of the month from the average value (value D2) is used.

  In the present embodiment, a value D1 indicated by a solid line in FIG. 4 is calculated as the daily average value. Specifically, in the present embodiment, the value D1 is 2,101 [MJ], which is the “period average” value of “exclude data less than a predetermined value (D3)” in the table shown in FIG.

  FIG. 6 shows an example of data excluding the day in which the daily hot water supply load heat amount is equal to or less than the value D3 in one month. In the data of this embodiment shown in FIG. 6, 12/06 (Sunday) in which the daily hot water supply load heat amount is equal to or less than the value D3 in the period of one month from December 1 to December 31, which is a predetermined period. 12/13 (Sunday) and 12/20 (Sunday) are excluded. Moreover, the hot water supply load calorie | heat amount 33 [MJ] of 12/01 (Tue) "06 o'clock" shown in FIG. 6 is the hot water supply load calorie | heat amount in 1 hour from 05:00 to 06 o'clock. That is, the hot water supply load heat quantity at every hour shown in FIG. 6 stores the hot water supply load heat quantity for one hour until every hour on the hour.

  That is, as shown in FIG. 6, each time zone such as 6 o'clock, 7 o'clock, 8 o'clock, etc. is divided as a time zone in units of one hour, and the hot water supply load calorific value for each time zone is divided. A monthly average is calculated. In the example shown in FIG. 6, the 1-month average at 6 o'clock is 48 [MJ], the 1-month average at 7 o'clock is 120 [MJ], and the 1-month average at 8 o'clock is 152 [MJ]. MJ]. Such a value is calculated as a time zone average. In the case of this embodiment, the value of the hot water supply load calorific value for each hour calculated by the hot water supply load calorie calculation unit 102 is used as the hot water supply load calorie for each time zone when calculating the time zone average.

  In the present embodiment, as described above, by excluding data below a predetermined value, data on holidays and apparently less hot water heater operation are excluded from the average value calculation target. By pulling up, it is possible to prevent running out of hot water for hot water supply in the hot water storage tank 10.

  As described above, the hot water supply load heat amount average value calculation unit 104 of the control unit 100 calculates the daily average value and the time zone average value except for the data on the day when the daily hot water load heat amount is a predetermined value or less in one month. Functions as a means to

  The required hot water storage heat amount calculation unit 105 calculates the required hot water storage heat amount for each time period using the daily average value and the time period average value for the hot water supply load heat amount calculated by the hot water supply load heat amount average value calculation unit 104. The required amount of stored hot water is an amount having the same [MJ] as the hot water supply load heat amount, and is the amount of heat to be secured in each time zone.

  This will be specifically described with reference to FIG. As described above, the values (45, 46,... 42) at the respective times in the column of “hot water supply load [MJ] (time average)” in the table of FIG. It is a time zone average value, and the value (2, 101) of “daily counter” in the same column is a daily average value calculated by the hot water supply load heat amount average value calculation unit 104.

  In the table shown in FIG. 7, “time” 23:00 is the time zone on the start point side, and from 23:00 to 22:00 is a unit of one day. In addition, in the table | surface shown in FIG. 7, description of the value to 1-8 o'clock and 19-21 o'clock is abbreviate | omitted. Moreover, the hot water supply load (time zone average) “45” at “23:00” shown in FIG. 7 is an average value of the hot water supply load for 1 hour from 22:00 to 23:00. That is, similar to FIG. 6 described above, the hot water supply load at every hour shown in FIG. 7 stores the time zone average value of the hot water load required for one hour until every hour.

  In calculating the required amount of stored hot water for each time zone, as shown in FIG. 7, first, “back-calculated hot water supply load [MJ]” is calculated. The reverse calculation hot water supply load is a value calculated for each time (time zone). In the case of the present embodiment, 2,101, which is the daily average value for the hot water supply load heat amount, corresponds to the reverse hot water supply load in the time zone of 23:00 (23:00 level), which is the start time zone for “time”. That is, the value of the amount of heat required at 22:00 which is the start time in the unit of one day corresponds to the daily average value (2, 101) which is the total value for one day of the time zone average.

  Next, the reverse calculation hot water supply load at 24:00 is a value obtained by subtracting the time zone average value at 23:00 from the reverse calculation hot water supply load at 23:00, which is the time zone immediately before 24:00. In other words, in the example shown in FIG. 7, the reverse hot water supply load at 24:00 is a value obtained by subtracting 45 [MJ], which is the average time zone at 23:00, from 2101 [MJ], which is the reverse hot water supply load at 23:00. 2056 [MJ]. Similarly, the reverse calculation hot water supply load at 10 o'clock is 1366 [MJ] which is a value obtained by subtracting 266 [MJ] which is the average time zone at 9 o'clock from 1632 [MJ] which is the reverse calculation hot water supply load at 9 o'clock. Become. In this way, the “back-calculated hot water supply load [MJ]” for each time zone divided in units of one hour is the time zone immediately before (1 hour before) the time zone (for example, 24:00) (for example, 23:00). It is a value obtained by subtracting the time zone average value of the time zone immediately before (1 hour before) (for example, 23:00) from the value of the reverse hot water supply load.

  Then, the necessary amount of stored hot water for each time zone is calculated from the reverse calculation hot water supply load calculated for each time zone. In this embodiment, a value obtained by multiplying the value of the reverse hot water supply load at 23:00 by 1.2 is calculated as the necessary hot water storage heat amount. Therefore, in the case of the present embodiment, as shown in FIG. 7, the “necessary hot water storage amount [MJ]” at 23:00 is a value obtained by multiplying the value 2101 of the “back-calculated hot water supply load [MJ]” at 23:00 by 1.2. 2521. Hereinafter, the required hot water storage amount in each time zone is calculated from the value of the required hot water storage amount in the time zone immediately before (1 hour before) the hot water supply time just before that time zone in the same manner as the above-described value of the reverse hot water supply load. Calculated by subtracting the load (average time zone value).

  Thus, by calculating the reverse hot water supply load based on the daily average value and the time zone average value for the hot water load heat amount, and calculating the necessary hot water storage amount from the reverse calculation hot water load, The amount of heat retained in the tank 10 (“current amount of stored hot water” in FIG. 7) can be set to a value with some margin. Thereby, for example, it is possible to provide a hot water supply device that is less likely to cause hot water shortage even when the amount of hot water supply is suddenly changed.

  From this point of view, the value multiplied by the reverse hot water supply load when calculating the required hot water storage heat amount is not limited to a numerical value of 1.2 as in the present embodiment, and is, for example, a predetermined value within a range of 1.1 to 1.5. The numerical value of may be sufficient. In calculating the required hot water storage heat amount, a value obtained by adding a predetermined value to the value of the reverse calculation hot water supply load may be calculated as the required hot water storage heat amount. That is, as the value of the required hot water storage heat amount, a value that is somewhat larger than the value of the reverse calculation hot water supply load may be calculated by multiplying or adding a predetermined value to the value of the reverse calculation hot water supply load.

  As described above, the necessary hot water storage heat amount calculation unit 105 of the control unit 100 functions as a means for calculating the required hot water storage heat amount for each time zone based on the daily average value and the time zone average value for the hot water supply load heat amount.

  The operation trigger determination unit 106 determines the operation trigger value (operation start trigger value) that triggers the start and stop of the operation of the heat pump 40 based on the required hot water storage amount for each time period calculated by the required hot water storage amount calculation unit 105. And stop trigger value). The operation start trigger value and the operation stop trigger value are values to be compared with the current hot water storage heat amount [MJ], and are values for switching the heat pump 40 ON / OFF according to the current hot water storage heat amount [MJ]. It is. Specifically, when the current hot water storage heat amount [MJ] becomes smaller than the operation start trigger value, the control unit 100 starts the operation of the heat pump 40, and the current hot water storage heat amount [MJ] becomes larger than the operation stop trigger value. Then, the operation of the heat pump 40 is stopped.

  In the case of the present embodiment shown in FIG. 7, the value of the operation start trigger at 23:00 is the value of the operation start trigger obtained by multiplying the value 2521 [MJ] of the necessary hot water storage amount at 23:00 by a correction coefficient S described later. As determined.

  In the present embodiment, the operation trigger determination unit 106 uses a value called a correction coefficient S when calculating the operation start trigger value based on the required amount of stored hot water for each time period. The correction coefficient S is calculated based on the fluctuation of the water supply temperature during the past month. Specifically, the correction coefficient S is calculated as follows.

  That is, in the case of the present embodiment shown in FIG. 6, the correction coefficient S is the average value (11.4 ° C.) of the “water supply temperature [° C.]” for one month and the last 5 days (in FIG. 6, 12/27 to 12/31) and the average value (9.6 ° C.) of the “water supply temperature [° C.]”. In addition, the minimum value of the measured value of the daily water supply temperature sensor T12 is stored as the daily water supply temperature [° C.] shown in FIG.

The correction coefficient S is calculated by the following equation (3).
Correction coefficient S = (K−Tb) ÷ (K−Ta) (3)
Here, Ta is a measured value of the feed water temperature sensor T12, that is, an average value (° C.) of the latest one month of the feed water temperature, and is 11.4 ° C. in the present embodiment. Moreover, Tb is an average value of the latest 5 days of the water supply temperature, and is 9.6 ° C. in the present embodiment. Moreover, K is the temperature of hot water supplied at the hot water outlet terminal 63 shown in FIG. 1, and the temperature of hot water 45 ° C. used at the hot water supply terminal in the hot water supply apparatus of this embodiment is used as the predetermined value. Then, as shown in FIG. 7, a value of “1.04” is calculated as the correction coefficient S by the above equation (3).

  In the case of the present embodiment shown in FIG. 7, for example, at 23:00, a value 2622 [MJ] obtained by multiplying the value 2521 [MJ] of the necessary hot water storage heat amount by 1.04 as the correction coefficient S is the value of the operation start trigger. As determined.

  In the present embodiment, in the process of calculating the correction coefficient S by the operation trigger determination unit 106, when calculating the average value of the feed water temperature for one month and the average value for the latest five days, the hot water supply load heat amount average value calculation unit 104 Similarly to the calculation of the daily average value for the hot water supply load heat amount, data (see FIG. 6) excluding the data of the day when the daily hot water supply load heat amount is equal to or less than the predetermined value in a predetermined period (one month) is used. However, it is not limited to this. In other words, the calculation of the average value of the feed water temperature performed in the process of calculating the correction coefficient S may include data on the day when the daily hot water supply load heat amount is equal to or less than a predetermined value for the feed water temperature data.

  In this way, when the correction coefficient S is determined by the change in the temperature of water such as tap water supplied from the water supply port 31, for example, when the water supply temperature becomes low at the turn of the season from autumn to winter, the heat pump The value of the operation start trigger that triggers the start of the operation of 40 is set high, and the heat pump 40 can be operated early. On the other hand, when the water supply temperature increases at the turn of the season from spring to summer, the operation start trigger value is set low, and the operation of the heat pump 40 can be delayed. That is, the operation of the heat pump 40 can be efficiently controlled according to the change in season.

  Then, the driving trigger determination unit 106 calculates a value obtained by multiplying the driving start trigger value by 1.1 as the driving stop trigger value. Therefore, in the case of the present embodiment, as shown in FIG. 7, for example, the value of the operation stop trigger at 23:00 is a value 2884 [MJ] obtained by multiplying the value 2622 [MJ] of the operation start trigger by the value 1.1. . The value calculated in this way is determined as the value of the operation stop trigger. Thus, by increasing the value of the operation stop trigger at a predetermined rate with respect to the value of the operation start trigger, it is possible to prevent the heat pump 40 from being frequently started and stopped repeatedly.

  From this point of view, the value to be multiplied by the value of the operation start trigger when calculating the value of the operation stop trigger is not limited to the numerical value 1.1 as in the present embodiment, for example, 1.1 to 1.5 It may be a predetermined numerical value within the range. In calculating the value of the operation stop trigger, a value obtained by adding a predetermined value to the value of the operation start trigger may be calculated as the value of the operation stop trigger. That is, as the operation stop trigger value, a value that is somewhat larger than the operation start trigger value may be calculated by multiplying or adding a predetermined value to the operation start trigger value.

  As described above, the operation trigger determination unit 106 of the control unit 100 determines a value of the operation start trigger based on the required amount of stored hot water, and determines a value of the operation stop trigger based on the determined value of the operation start trigger. Function as.

  The current hot water storage heat amount calculation unit 107 calculates the current hot water storage heat amount [MJ] in specific time units. Here, the value of the hot water storage heat amount [MJ] is compared with the value of the operation start trigger and the value of the operation stop trigger as described above, and becomes a value for switching the heat pump 40 ON / OFF. Further, the “specific time” is a time shorter than a predetermined time (1 hour), and in this embodiment, the specific time is 1 minute.

  At this time, the hot water storage calorie calculation unit 107 calculates the measured values of the hot water storage temperature sensors T1 to T9 as a condition on the condition that the measured values of the hot water storage temperature sensors T1 to T9 are equal to or higher than a specified value (for example, 45 ° C.). A temperature difference from the measured value of the feed water temperature sensor T12 is obtained, and the current amount of stored hot water in the hot water storage tank 10 is calculated based on the temperature difference. This is because when the measured values of the hot water storage temperature sensors T1 to T9 are lower than a specified value (for example, 45 ° C.), the hot water of that layer cannot be used for hot water supply, and thus the measured values of the hot water storage temperature sensors T1 to T9 are less than the specified value. This is because the amount of heat held by the hot water layer is invalid and excluded from the current amount of stored hot water in the hot water storage tank 10.

Specifically, the current hot water storage heat amount is calculated according to the above equation (1) for calculating the retained heat amount X of the hot water storage tank 10. That is, the current hot water storage heat quantity Z is calculated by the following equation (4).
Z = {Σ (ti−tk) / 9} × V × 4.186 ÷ 1000 (i = 1, 2,... 9) (4)

  However, in the above formula (4), the current hot water storage heat amount is calculated as ti = tk when ti, which is a measured value of each of the hot water storage temperature sensors T1 to T9, is less than a specified value (for example, 45 ° C.). . Thus, by excluding the heat quantity of the temperature layer below the specified value (for example, 45 ° C.) not suitable for hot water supply from the current hot water storage heat quantity calculated by the current hot water storage heat quantity calculation unit 107, it is practically suitable for hot water supply. The amount of hot water stored in the hot water storage tank 10 can be calculated.

  In the case of the present embodiment, as shown in FIG. 7, for example, the current hot water storage heat value at 23:00 is 1200 [MJ]. The value of the current hot water storage heat amount at each time (time zone) shown in FIG. 7 is, for example, the final value at a predetermined time of the value of the current hot water storage heat amount calculated for each specific time at each time (time zone).

  As described above, the current hot water storage heat amount calculation unit 107 calculates the current hot water storage heat amount [MJ] at a specific time (one minute) interval shorter than a predetermined time (1 hour). Even when the hot water is rapidly supplied in a short time and the amount of stored hot water is insufficient, the heat pump 40 can be started and stopped quickly, so that the heat pump 40 is not operated more than necessary and energy saving is achieved. be able to.

  As described above, the current hot water storage heat amount calculation unit 107 of the control unit 100 functions as means for calculating the current hot water storage heat amount of the hot water storage tank 10.

  Then, the control unit 100 compares the value of “operation start trigger [MJ]” shown in FIG. 7 with the value of “current hot water storage heat amount [MJ]” and the value of “current hot water storage heat amount [MJ]” is “ When the value is lower than the value of the operation start trigger [MJ], the operation of the heat pump 40 is started. Then, when the value of “current hot water storage heat amount [MJ]” becomes higher than the value of “operation stop trigger [MJ]”, the operation of the heat pump 40 is stopped.

  Specifically, in FIG. 7, at the time of “23:00” and “24:00”, the value of “current hot water storage heat amount [MJ]” is lower than the value of “operation start trigger [MJ]”. The heat pump 40 is operated to heat the hot water stored in the hot water storage tank 10. The time points of “23:00” and “24:00” are time zones in which the amount of hot water supply is extremely small, such as late at night, during the daily operation of the hot water supply apparatus. In the present embodiment, by using this midnight time zone, the hot water in the hot water storage tank 10 is heated by the inexpensive late-night power until it reaches the “current hot water storage heat amount [MJ]” necessary for the next day. I have to.

In addition to the above-mentioned midnight time zone, as shown in FIG. 7, the value of “current hot water storage heat [MJ]” is lower than the value of “operation start trigger [MJ]” at “14:00”. There is a case. The value of “hot water supply load (time zone average) [MJ]” shown in FIG. 7 is “62 [MJ]” at 12 o'clock, but actually “2100 (current at 11 o'clock). Hot water storage heat amount) -1600 (current hot water storage heat amount at 12:00) = 500 [MJ]. Furthermore, it is 127 [MJ] at the time of 14:00, but actually, “1400 (current amount of stored hot water at 13:00) −1100 (current amount of stored hot water at 14:00) = 300 [MJ] Is. In other words, more hot water supply than the scheduled hot water supply operation in which the actual “hot water supply load [MJ]” becomes extremely larger than the value of the planned “hot water supply load (time zone average) [MJ]”. As a matter of course, the required amount of hot water stored after that is reduced. For this reason, the heat pump 40 in the OFF state is operated in order to heat the hot water in the hot water storage tank 10 and to secure the necessary amount of hot water storage.
The heat pump 40 whose operation is turned on at “14:00” is turned off when the value of “current hot water storage amount [MJ]” exceeds the value of “operation stop trigger [MJ]”. Therefore, in the example shown in FIG. 7, the heat pump 40 in the ON state is turned off at “17:00” when the value of “current hot water storage amount [MJ]” is higher than the value of “operation stop trigger [MJ]”, The operation of the heat pump 40 is stopped.

  In the present embodiment, the stored heat amount calculation unit 101 described above calculates the stored heat amount in the hot water storage tank 10 in units of one hour as a predetermined time unit, but the predetermined time is not limited to one hour. , Which is appropriately set in the range of several tens of minutes to several hours. That is, an optimal predetermined time may be set according to the installation status and usage status of the hot water supply device.

  Moreover, although the hot water supply load calorie | heat amount average value calculation part 104 mentioned above calculates the average value of the hot water supply load calorie | heat amount in 1 month every day as a predetermined period, a predetermined period is not limited to 1 month, For example, from several days It is set as appropriate within a range of several months. Further, the above-described current hot water storage heat amount calculation unit 107 calculates the current hot water storage heat amount in units of 1 minute as a specific time unit, but the specific time is not limited to 1 minute, and may be, for example, 5 minutes or 10 minutes. . These predetermined period and specific time should just set the optimal predetermined period and specific time according to the installation condition and use condition of a hot-water supply apparatus similarly to the predetermined time mentioned above.

  According to the embodiment described above, the following hot water supply apparatus can be realized.

  (1) A heat pump 40 (heating means) that heats water into hot water, a hot water storage tank 10 that stores hot water obtained by the heat pump 40 and water supplied from the water supply path 30, and a hot water storage tank 10 are provided. A plurality of hot water storage temperature sensors T1 to T9 that measure the temperature of hot water stored in the hot water storage tank 10, and a water supply temperature sensor that is provided in the water supply passage 30 and measures the temperature of water supplied from the water supply passage 30 to the hot water storage tank 10. In the hot water supply apparatus provided with T12 and the control unit 100 (control means) that controls the operation of the heat pump 40, the control unit 100 includes the measured values of the plurality of hot water storage temperature sensors T1 to T9 and the water supply temperature sensor T12, and hot water storage. Based on the hot water storage capacity V of the tank 10, the stored heat amount calculation unit 101 that calculates the stored heat amount of the hot water storage tank 10 in units of a predetermined time (for example, 1 hour), and the stored heat amount calculation Subtracting the stored heat amount at the current time calculated by the stored heat amount calculation unit 101 from the stored heat amount before the predetermined time from the current time calculated by 101, and the heating heat amount by the heat pump 40 at the predetermined time A hot water supply load calorie calculation unit 102 that calculates the hot water supply load calorie of the predetermined time unit by performing addition, and further calculates a hot water supply load calorie amount per day from the calculated hot water load heat calorie of the predetermined time unit, and a hot water supply load calorie calculation unit The hot water supply heat quantity storage unit 103 for storing the hot water supply load heat quantity in units of the predetermined time calculated by 102 and the daily hot water supply load heat quantity, and the hot water supply load heat quantity in the predetermined time units stored in the hot water supply load heat quantity storage unit 103 And from the data of the daily hot water supply load calorific value, the predetermined amount (for example, one month) of the daily hot water supply load calorie is not more than a predetermined value. The average value of the hot water supply load heat amount for each day in the predetermined period and the average value of the hot water load heat amount for each time zone divided by the predetermined time in the predetermined period Necessary for each time zone based on the average value of the hot water supply load heat amount for each day calculated by the value calculation unit 104 and the hot water supply load heat amount average value calculation unit 104 and the average value of the hot water supply load heat amount for each time zone Based on the necessary hot water storage calorie calculating unit 105 for calculating the hot water storage calorie and the required hot water storage calorie calculated by the required hot water storage calorie calculating unit 105, a value of an operation start trigger that triggers the start of the operation of the heat pump 40 is determined. Based on the determined operation start trigger value, an operation trigger determination unit 106 that determines an operation stop trigger value that triggers the stop of the heat pump 40, and a plurality of storage triggers. Based on the difference between the measured value of the hot water temperature sensors T1 to T9 that is equal to or higher than a specified value (for example, 45 ° C.) and the measured value of the feed water temperature sensor T12, and the hot water storage capacity V of the hot water storage tank 10, the predetermined time. A current hot water storage heat amount calculation unit 107 that calculates the current hot water storage heat amount of the hot water storage tank 10 in units of a shorter specific time (for example, 1 minute), and the value of the operation start trigger determined by the operation trigger determination unit 106 Based on the value of the operation stop trigger and the current hot water storage heat amount calculated by the current hot water storage heat amount calculation unit 107, the start and stop of the operation of the heat pump 40 are controlled.

  According to the hot water supply apparatus having such a configuration, the heat pump 40 that is the heating means can be efficiently controlled according to the required amount of hot water supply, so that the hot water supply apparatus can be provided with a low running cost. In addition, after the operation of the heat pump 40 is started, a hot water supply apparatus having a learning ability of a change in the hot water supply load heat amount can be obtained.

  (2) The operation trigger determination unit 106 supplies the average value of the measured values of the water supply temperature sensor T12 for each day in a predetermined period (for example, one month) and the water supply in a partial period (for example, five days) closest to the predetermined period. The correction coefficient S is calculated based on the average value of the measured values of the temperature sensor T12, and the calculated correction coefficient S is multiplied by the value of the necessary hot water storage calorie calculated by the required hot water storage calorie calculation unit 105, whereby the operation is performed. Calculate the start trigger value.

  With such a configuration, by using the correction coefficient S, the heat pump 40 can be efficiently controlled following the change in the hot water supply load calorific value due to the seasonal change in the feed water temperature. Further, the operation stop trigger is calculated by multiplying the operation start trigger [MJ] by the value 1.1. Thus, by increasing the value of the operation stop trigger at a predetermined rate with respect to the value of the operation start trigger, it is possible to prevent the heat pump 40 from being frequently started and stopped repeatedly, and the heat pump It can be set as the hot-water supply apparatus with little load to 40.

  (3) When the hot water storage heat amount calculation unit 107 detects a measurement value less than a specified value (for example, 45 ° C.) in the measurement values of the plurality of hot water storage temperature sensors T1 to T9, the measurement value less than the specified value is held. The amount of heat is excluded as invalid, and the current amount of stored hot water in the hot water storage tank 10 is calculated.

  With this configuration, the current hot water storage heat amount calculated by the current hot water storage heat amount calculation unit 107 does not include the heat amount of a temperature layer below a specified value (eg, 45 ° C.) that is not suitable for hot water supply. The hot water storage heat amount of the hot water storage tank 10 can be calculated, and a hot water supply device with a low possibility of causing hot water shortage can be obtained.

  Although the embodiments have been described above, the specific configuration of the present invention is not limited to the above-described embodiments, and design changes and the like within a scope not departing from the gist of the invention are included in the present invention.

DESCRIPTION OF SYMBOLS 10 Hot water storage tank 30 Water supply path 40 Heat pump 50 Circulation path for hot water storage 60 Circulation flow path for hot water supply 100 Control part 101 Calorie | heat amount calculation part 102 Hot water supply heat quantity calculation part 103 Hot water supply heat quantity memory | storage part 104 Hot water supply load heat quantity average value calculation part 105 Necessary Hot water storage calorie calculation unit 106 Operation trigger determination unit 107 Current hot water storage calorie calculation unit M Circulation channel measuring instrument T1 Hot water storage temperature sensor T10 Hot water temperature sensor T11 Incoming water temperature sensor T12 Supply water temperature sensor

Claims (3)

Heating means for heating the water to hot water;
A hot water storage tank for storing hot water obtained by the heating means and water supplied from a water supply channel;
A plurality of hot water temperature sensors that are provided in the hot water storage tank and measure the temperature of the hot water stored in the hot water storage tank;
A water supply temperature sensor that is provided in the water supply channel and measures the temperature of water supplied from the water supply channel to the hot water storage tank;
In a hot water supply apparatus comprising a control means for controlling the operation of the heating means,
The control means includes
Based on the measured values of the plurality of hot water storage temperature sensors and the feed water temperature sensor, and the hot water storage capacity of the hot water storage tank, the retained heat amount calculation unit that calculates the retained heat amount of the hot water storage tank in predetermined time units,
Subtracting the stored heat amount at the current time calculated by the stored heat amount calculation unit with respect to the stored heat amount before the predetermined time from the current time calculated by the stored heat amount calculation unit, and the time at the predetermined time Adding a heating heat amount by a heating means, calculating a hot water supply load heat amount in the predetermined time unit, and further calculating a hot water supply load heat amount for each day from the calculated hot water supply load heat amount in the predetermined time unit; and
A hot water supply load heat quantity storage unit for storing the hot water supply load heat quantity in units of the predetermined time calculated by the hot water supply load heat quantity calculation unit, and the daily hot water supply load heat quantity;
From the data of the hot water supply load heat quantity in the predetermined time unit and the daily hot water supply load heat quantity stored in the hot water supply load heat quantity storage unit, the data of the day when the daily hot water supply load heat quantity becomes a predetermined value or less in a predetermined period is obtained. Except, an average value of the hot water supply load heat amount for each day in the predetermined period, and a hot water supply load heat amount average value calculation unit for calculating an average value of the hot water load heat amount for each time period divided by the predetermined time in the predetermined period;
Based on the average value of the hot water supply load heat amount for each day calculated by the hot water supply load heat amount average value calculation unit and the average value of the hot water supply load heat amount for each time zone, it is necessary to calculate the required hot water storage heat amount for each time zone A stored hot water calorific value calculation unit,
Based on the required hot water storage calorific value calculated by the required hot water storage calorific value calculation unit, determine the value of the operation start trigger that triggers the start of the operation of the heating means, based on the determined value of the operation start trigger, An operation trigger determination unit that determines the value of the operation stop trigger that triggers the stop of the heating means;
Based on the difference between the measured value of the measured value of the plurality of hot water storage temperature sensors or more and a measured value of the feed water temperature sensor, and the hot water storage capacity of the hot water storage tank, in a specific time unit shorter than the predetermined time. A current hot water storage heat amount calculation unit for calculating a current hot water storage heat amount of the hot water storage tank,
The required hot water storage heat amount is a value obtained by multiplying the value of the reverse calculation hot water supply load calculated for each time zone by a value greater than 1, or a value obtained by adding a predetermined value to the value of the reverse calculation hot water supply load,
The reverse calculation hot water supply load is an average value of the daily hot water supply load heat amount for the start time zone of the time zone, and from the value of the reverse calculation hot water load of the immediately preceding time zone for the time zone after the start time zone. It is a value obtained by subtracting the average value of the hot water supply load calorific value for each time zone in the immediately preceding time zone,
Based on the value of the operation start trigger determined by the operation trigger determination unit and the value of the operation stop trigger, and the current hot water storage heat amount calculated by the current hot water storage heat amount calculation unit, start of operation of the heating means And a hot water supply device for controlling stoppage. The driving trigger determination unit
Calculating a correction coefficient based on an average value of the measured values of the feed water temperature sensor for each day in the predetermined period and an average value of the measured values of the feed water temperature sensor in a part of the period closest to the predetermined period;
2. The hot water supply according to claim 1, wherein the value of the operation start trigger is calculated by multiplying the calculated correction coefficient by the value of the required hot water storage calorie calculated by the required hot water storage calorie calculation unit. apparatus.   When the current hot water storage heat amount calculation unit detects a measurement value less than a specified value in the measurement values of the plurality of hot water storage temperature sensors, the heat value held by the measurement value less than the specified value is excluded as invalid, and the hot water storage tank The hot water supply apparatus according to claim 1, wherein the hot water storage heat amount is calculated.

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