JP5535278B2 - Hot water storage hot water supply system - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply system, and more particularly to control of heating means.

The hot water storage type hot water supply system is a system that is applied when the heating capability of the heating means is relatively small as compared with an instantaneous hot water supply system or the like, or when the rise of the capability at the time of activation of the heating means is slow.
In addition, the hot water storage type hot water supply system stores hot water for hot water boiled by the heating means in advance in the hot water storage tank so that the hot water does not run out due to the hot water supply load. It is a system that supplies hot water.

  As such a conventional hot water storage type hot water supply system, for example, “... Hot water prediction means (202) that predicts large hot water by performing learning control from the data stored in the hot water storage means (246), and the hot water Prior to pouring the large hot water predicted by the prediction means (202), the heating means (2) is operated to supply hot water for hot water supply of the required hot water storage amount calculated by the required hot water storage amount calculation means (205). And a first heating means (233) for performing a heating operation for storing on the hot water storage side of the tank (1) "(for example, see Patent Document 1).

  Further, as such a conventional hot water storage type hot water supply system, for example, “... used heat amount calculation means for calculating the amount of heat used within a predetermined period from the amount of hot water supplied from the hot water storage tank within a predetermined period and storing data,” A boiling target heat amount calculating means for calculating a boiling target heat amount based on the accumulated data, and a boiling target temperature for calculating a boiling target temperature based on the boiling target heat amount calculated by the boiling target heat amount calculating means. There has been proposed "comprising a calculating means and a boiling means for boiling a required amount based on the boiling target temperature calculated by the boiling target temperature calculating means" (see, for example, Patent Document 2).

JP 2007-285607 A (Claim 1) JP 2002-168524 A (Claim 1)

The hot water storage hot water supply system described in Patent Literature 1 is a continuous hot water supply, and the occurrence time of hot water (hereinafter also referred to as “large hot water”) at which the hot water supply load integrated value is equal to or greater than a predetermined amount, and the past of the hot water supply load integrated value. Based on the actual results, the time of occurrence of large hot water and the required amount of heat are predicted. Then, the time required to boil the amount of heat required for the large hot water supply from the time when the occurrence of the large hot water supply is predicted is subtracted, and the heating means for boiling the hot water required for each large hot water supply is started. Set the time.
Thereby, the boiling of hot water required for the large hot water supply can be brought close to the generation time of the large hot water supply, so that the heat loss from the hot water storage tank is reduced and the efficiency of the hot water storage type hot water supply system is improved.

  However, in the hot water storage type hot water supply system described in Patent Document 1, the boiling start timing of hot water is determined based on the most recent hot water supply from the current time, and a method for preparing for the next large hot water supply after the hot water supply ends. It has become. For this reason, for example, when two large hot water supplies are generated at close time intervals, even if the first large hot water supply is sufficient, there is a problem that hot water breaks out at the next large hot water supply.

  Moreover, the hot water storage type hot water supply system described in Patent Document 2 predicts the required amount of heat on the day based on the past hot water supply results, and supplies the hot water corresponding to the required heat amount to a hot water storage tank, for example, at night when electricity charges are inexpensive. Used for boiling and hot water supply.

  However, in the hot water storage type hot water supply system described in Patent Document 2, the boiling temperature of hot water stored in the hot water storage tank is determined on the basis that the required amount of heat for one day is stored in the hot water storage tank capacity. For this reason, there has been a problem that the boiling temperature becomes excessively high, heat dissipation loss increases, and the efficiency of the equipment decreases depending on the heating means for boiling hot water.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a hot water storage type hot water supply system that can suppress a heat dissipation loss from a hot water storage tank and can improve energy saving as compared with the conventional one. .

The hot water storage type hot water supply system according to the present invention comprises heating means for heating water to make hot water, a hot water storage tank for storing the hot water, and control means for controlling the operation of the heating means, the control means comprising: Heat storage amount calculating means for determining the amount of heat stored in the hot water storage tank, hot water supply load calculating means for determining the actual amount of hot water load that is the amount of heat lost from the hot water storage tank per unit time, and the hot water supply determined by the hot water supply load calculating means A hot-water supply load storage means for storing information relating to the load, wherein the hot-water supply load storage means stores information necessary for specifying the amount of change in the integrated value of the hot-water supply load during a unit period, and the control means, on the basis of the heating capacity of the stored information and the heating means of the hot water supply load storage means, said hot water storage to calculate the necessary quantity of thermal storage that needs to store in the tank, based on the required heat storage quantity calculated Said activation of the heating means to calculate a determined activation heat storage amount, when the amount of stored heat of the hot water storage tank becomes the start heat storage amount or less, which activates the heating means.

In the present invention, based on the information necessary for specifying the amount of change in the integrated value of the hot water supply load during a unit period and the heating capacity of the heating means, the amount of heat that must be stored in the hot water storage tank at a minimum at each time The amount of heat stored in the hot water storage tank is controlled based on this amount of heat.
For this reason, starting of a heating means can be operated so that the amount of heat storage of a hot water storage tank may become as small as possible, and energy saving property can be improved.

It is a block diagram of the hot water storage type hot water supply system which concerns on Embodiment 1 of this invention. It is a block diagram showing the flow of the signal which concerns on Embodiment 1 of this invention. It is a time chart showing the flow of detection, analysis, arrangement, and storage of hot water supply load according to the first embodiment of the present invention. It is the schematic showing the flow of the hot_water | molten_metal group coupling | bonding process which determines whether it couple | bonds and handles several hot water supply from the stored hot water supply information which concerns on Embodiment 1 of this invention. It is an example of the memory | storage information which the hot water supply load memory | storage means possesses after implementing the hot water supply group coupling | bonding process. It is the schematic showing the flow which estimates the hot water supply load of the day which concerns on Embodiment 1 of this invention. It is a time chart showing the starting method of the heating means 2 which concerns on Embodiment 1 of this invention. It is the schematic showing the method of calculating the heat storage amount required for the hot water storage tank which concerns on Embodiment 2 of this invention. It is the schematic showing the method of calculating the heat storage amount required for the hot water storage tank which concerns on Embodiment 3 of this invention. It is the schematic showing the method of extracting the feature-value used when setting the starting heat storage amount which concerns on Embodiment 3 of this invention from required heat storage amount. It is the schematic showing the method of setting the starting heat storage amount which concerns on Embodiment 3 of this invention. It is a block diagram of the hot water storage type hot water supply system which concerns on Embodiment 4 of this invention. It is a block diagram showing the flow of the signal which concerns on Embodiment 4 of this invention. It is the schematic showing an example of the setting method of the heat exchange load coefficient which concerns on Embodiment 4 of this invention.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a hot water storage type hot water supply system according to Embodiment 1 of the present invention.
The hot water storage type hot water supply system in the first embodiment includes a hot water storage tank 1, a heating means 2, a circulation pump 3, a mixing means 4, a heating pipe 301, a water supply pipe 302, a lead-out pipe 303, a mixing pipe 304, and a hot water supply The piping 305, the control means 100, etc. are provided.

Hot water storage tank 1 stores hot water.
The heating means 2 is connected in the middle of the heating pipe 301. This heating means 2 is comprised, for example using a heat pump cycle.
The circulation pump 3 is connected in the middle of the heating pipe 301.
The mixing means 4 is connected to the outlet pipe 303.
The heating pipe 301 connects the lower part and the upper part of the hot water storage tank 1.
The water supply pipe 302 is connected to the lower part of the hot water storage tank 1.
The lead-out pipe 303 is connected to the upper part of the hot water storage tank 1.
The mixing pipe 304 is branched from the water supply pipe 302 and connected to the mixing means 4.
The hot water supply pipe 305 supplies the hot water mixed by the mixing means 4 to the load side to be used.
The control unit 100 controls operations of the heating unit 2, the circulation pump 3, and the mixing unit 4.

  The outlet pipe 303, the mixing pipe 304, the hot water supply pipe 305, and the mixing means 4 correspond to the hot water supply pipe in the present invention.

The hot water storage tank 1 is provided with hot water storage temperature sensors 501a to 501f at intervals in the height direction.
Although the case where the number of hot water storage temperature sensors is six will be described here, the present invention is not limited to this, and a sufficient number of temperature sensors are provided for measuring the temperature distribution inside the hot water storage tank 1. You may do it.

The heating pipe 301 is provided with a boiling temperature sensor 502 for detecting the hot water temperature after heating on the downstream side of the heating means 2.
The feed water pipe 302 is provided with a feed water temperature sensor 504 for detecting the feed water temperature. The feed water temperature sensor 504 may be provided in the mixing pipe 304.
The derivation pipe 303 is provided with a derivation temperature sensor 503 for detecting the hot water temperature derived from the hot water storage tank.
The hot water supply pipe 305 is provided with a hot water supply temperature sensor 505 for detecting the hot water temperature used on the load side.
The hot water supply pipe 305 is provided with a hot water supply flow rate sensor 601 for detecting the amount of hot water used on the load side.

FIG. 2 is a block diagram showing a signal flow according to Embodiment 1 of the present invention.
As shown in FIG. 2, the control means 100 includes a heat storage amount calculation means 101, a hot water supply load calculation means 102, a hot water supply load storage means 103, a hot water supply load prediction means 104, a heating control means 105, and the like.

The control means 100 includes information from a timer, a hot water storage temperature sensor 501a to 501f, a boiling temperature sensor 502, a derived temperature sensor 503, a feed water temperature sensor 504, a hot water temperature sensor 505, and a hot water flow rate sensor 601. Entered.
The control unit 100 controls the heating unit 2, the circulation pump 3, and the mixing unit 4 based on the input information. Details will be described later.

The heat storage amount calculation means 101 calculates the heat storage amount in the hot water storage tank based on information from the hot water storage temperature sensors 501a to 501f.
Note that the amount of heat stored in the hot water storage tank 1 that can be used for hot water supply may be calculated based on the hot water supply temperature specified by the hot water supply temperature specifying means (not shown).

The hot water supply load calculating means 102 detects the presence or absence of hot water supply to the load side based on the outputs of the timer, the hot water supply temperature sensor 505, and the hot water supply flow rate sensor 601.
The hot water supply load calculating means 102 also records the amount of heat (hot water supply load) supplied to the load per unit time (for example, 1 second), the integrated value of the hot water supply load during continuous hot water supply, and the unit period (for example, 1 day). The total hot water supply load integrated value for minutes is calculated.

  The hot water supply load storage means 103 analyzes, organizes and selects the calculation result of the hot water supply load calculation means 102 and stores information. Here, the hot water supply load storage means 103 corresponds to the hot water supply load storage calculation means of the present invention.

  The hot water supply load predicting means 104 predicts the hot water supply load after the current time based on the past results of the hot water supply load stored in the hot water supply load storage means 103.

  The heating control unit 105 obtains the activation time of the heating unit 2 based on the hot water supply load predicted by the hot water supply load prediction unit 104 (hereinafter referred to as “predicted hot water supply load”).

The configuration of the hot water storage type hot water supply system in the first embodiment has been described above.
Next, the operation of the hot water storage type hot water supply system in the first embodiment will be described.

  In the following description, the operation will be described with specific numerical values, but the present invention is not limited to this.

[Basic operation]
First, the basic operation of the hot water storage type hot water supply system according to the first embodiment will be described.
Low temperature water flows into the lower part of the hot water storage tank 1 through the water supply pipe 302 and is stored.
The low-temperature water collected from the lower part of the hot water storage tank 1 is drawn into the heating pipe 301 by the circulation pump 3 and guided to the heating means 2.
The heating means 2 heats the led low-temperature water to boil it to high-temperature hot water.
The boiled hot water flows from the upper part of the hot water storage tank 1 through the heating pipe 301 and is stored.

The hot water stored in the upper part of the hot water storage tank 1 flows out from the outlet pipe 303 and is guided to the mixing means 4 according to the demand on the load side where the hot water is used.
The mixing means 4 guides water through the mixing pipe 304 branched from the water supply pipe 302, mixes it with the hot water introduced from the hot water storage tank 1, and supplies it to the load side through the hot water supply pipe 305.

  Thereby, low-temperature water is boiled by the heating means 2 and hot water is stored in the hot water storage tank 1, and the hot water stored in the hot water storage tank 1 can be sent to the load side to be used.

[Memory of hot water load]
Next, the operation | movement which acquires and memorize | stores the performance of the past hot water supply load is demonstrated using FIG.

FIG. 3 is a time chart showing the flow of detection, analysis, arrangement, and storage of hot water supply load according to Embodiment 1 of the present invention.
The hot water supply load in the first embodiment uses a value obtained by converting the amount of hot water actually supplied to the load side into, for example, the amount of hot water when supplied to the load side at a hot water supply temperature of 42 ° C. At this time, the hot water supply load is obtained by setting the temperature of the water led from the mixing pipe 304 to the mixing means 4 (water supply temperature) to 9 ° C., for example. (That is, the hot water supply load is expressed in units of [L / min] and the hot water supply load integrated value is expressed in units of [L], for example.)
In addition, FIG. 3 shows 12:00 to 24:00 as an example of the time zone.

FIG. 3A shows the actual benefit load calculated by the hot water supply load calculating means 102.
The hot water supply load calculating means 102 monitors the output of the hot water supply flow rate sensor 601 and the output of the hot water supply temperature sensor 505 constantly or periodically.
The hot water supply load calculating means 102 calculates the hot water supply load supplied to the load side per unit time (for example, 1 second) based on the output of the hot water supply temperature sensor 505 and the output of the hot water supply flow rate sensor 601.
Note that in FIG. 1-No. The hot water supply load up to 7 is shown.

FIG. 3B shows the hot water supply load integrated value during the continuous hot water supply calculated by the hot water supply load calculating means 102.
The hot water supply load calculating means 102 calculates a “continuous hot water supply load integrated value” that is an integrated value of the hot water supply load in one continuous hot water supply (hereinafter also referred to as “continuous hot water supply”).
The hot water supply load calculating means 102 sequentially calculates the “continuous hot water supply load integrated value” and updates the “continuous hot water supply load integrated value” of the continuous hot water including the hot water at the current time.

FIG. 3C shows a hot water supply load integrated value for a unit period (for example, one day) calculated by the hot water supply load calculating means 102.
The hot water supply load calculating means 102 calculates the “total hot water supply load integrated value” as a total result of the hot water supply load integrated values of all hot water supplies during a unit period (for example, one day).
The hot water supply load calculating means 102 sequentially calculates the “total hot water supply load integrated value” and updates the “total hot water load integrated value” within a unit period including the current time.
In addition, in this Embodiment 1, the case where a unit period is 1 day is shown (among these, FIG. 3 shows "all hot water supply load integrated value" for half a day).
The unit period is not limited to one day, and can be an arbitrary period. For example, it may be half a day or two days.

FIG. 3D shows an example of information stored in the hot water supply load storage means 103.
Hot water supply load storage means 103 stores information of “total hot water supply load integrated value”.
In the example of FIG. 3, 538L is stored as the total hot water supply load integrated value [L].

Moreover, the hot water supply load storage means 103 stores information on the start time and end time of one hot water supply in which the hot water supply load continues and the hot water supply load integrated value (continuous hot water supply load integrated value) of the hot water supply.
In addition, for the sake of simplicity, the case of only a relatively large continuous hot water supply is described here, but a small amount of continuous hot water supply load such as a washing surface and hand washing may also be described. For example, if it is a continuous hot water supply load of a predetermined value or less (for example, 42 ° C. and 30 L or less), it may be considered that the influence is small and ignored.

[Hot-water group combination processing]
Next, based on the information stored in the hot water supply load storage means 103, whether or not to combine a plurality of hot water supplies as a group of hot water supplies is determined based on the heating capability of the heating means 2, and the hot water supply load memory is stored. The operation of updating the stored information of the means 103 will be described with reference to FIG.

  FIG. 4 shows a method for determining whether or not to combine a plurality of hot water supplies as a group of hot water supplies according to the first embodiment of the present invention on a time chart of total hot water supply load integrated values. It is.

  The hot water supply load storage means 103 determines whether or not to combine a plurality of hot water supplies as a hot water supply group (perform hot water supply group combination processing) by the following method. In the time interval from the end time of any hot water supply before a certain hot water supply to the end time of the hot water supply, the amount of heat that the heating means 2 can boil during this time interval and the hot water supply in the hot water supply during this time interval Compare the total load integrated value. If the amount of heat that can be raised by the heating means 2 during this time interval is smaller than the total hot water load integrated value in the hot water supply during this time interval, the hot water supply during this time interval is combined as a hot water supply group. To do.

  In the first embodiment, assuming that the heating means 2 has a heating capacity of, for example, about 2 L / min, and considering the safety, assuming the heating capacity of 1.5 L / min, the hot water supply group coupling process is performed. Shows the case. The alternate long and short dash line shown in FIG. 4 indicates the accumulated heat amount when the heating means 2 is boiled at a heating capacity of 1.5 L / min.

When the hot water supply group combining process in the first embodiment is specifically shown, as can be seen from FIG. 1 and hot water supply No. 1 No. 2 can boil the amount of heat required for the hot water supply even if the heating means 2 is started after the previous hot water supply is finished.
However, hot water supply No. 4 and hot water supply No. 4 5 is a hot water supply No.5. Even if the heating means 2 is started after 3 is finished, the amount of heat necessary for each hot water supply cannot be boiled until the hot water supply is finished. Hot water supply No. 4 and hot water supply No. 4 5 is a hot water supply No.5. When the heating means 2 is started after the hot water supply 2 is finished, the amount of heat required for the hot water supply can be raised.
Therefore, hot water supply No. No. 3 hot water supply No. 5 is re-interpreted as a group of hot water supplies, and the storage information of the hot water supply load storage means 103 is updated.

  Hot water supply No. The same applies to the hot water supply No. 7. Even if the heating means 2 is started after the end of the hot water supply 6, The amount of heat required for 7 cannot be boiled. Therefore, hot water supply No. 6 and hot water supply No. 6 7 is regarded as a group of hot water supplies, and the storage information of the hot water supply load storage means 103 is updated.

  It is assumed that the heating capability of the heating unit 2 according to Embodiment 1 is stable and shows a constant value immediately after the heating unit 2 is started. Not limited to this, the heating capability of the heating means 2 is more realistic, for example, assuming that the heating capability is zero for a predetermined period after activation, or a linear increase function that becomes a stable value after a predetermined period after activation. It may be assumed as a capability.

FIG. 5 is an example of updated storage information possessed by the hot water supply load storage means 103 after re-recognizing a plurality of hot water supplies as a group as described above.
In this example, the hot water supply load storage means 103 stores the combined hot water supply load integrated value and the hot water supply end time for each hot water supply (hot water supply group) after the hot water supply group combination processing is performed. Further, among each hot water supply (hot water supply group) after the hot water supply group combination processing is performed, “maximum hot water supply” and “other hot water supply” are distinguished, and the result of labeling is stored.

[Prediction of hot water supply load]
Next, the operation | movement which estimates the hot water supply load after the present time is demonstrated using FIG.

FIG. 6 is a schematic diagram showing a flow of predicting the hot water supply load on the current day from the stored past hot water supply results according to the first embodiment of the present invention.
The hot water supply load predicting means 104 predicts the total hot water supply load integrated value in the unit period including the current time based on the past actual hot water load integrated value stored in the hot water supply load storage means 103.
The hot water supply load predicting unit 104 predicts the hot water supply load integrated value and the end time of the hot water after the current time based on the information in the hot water load storage unit 103.

The hot water supply load prediction unit 104 predicts the hot water supply load during the unit period, for example, at the start of the unit period or at an arbitrary time.
The period for predicting the hot water supply load is not limited to this, and the hot water supply load in an arbitrary period may be predicted. For example, the hot water supply load for half a day or two days may be predicted.

  In the example of FIG. 6, based on the information after the hot water supply group combination process stored in the hot water supply load storage means 103, the total hot water supply load integrated value on the day including the current time and the hot water supply load of each hot water supply (hot water supply group). The integrated value and its end time are predicted. In the example of FIG. 6, based on the information for one week stored in the hot water supply load storage means 103, the total hot water supply load integrated value on the day including the current time and the hot water supply load of each hot water supply (hot water supply group). The integrated value and its end time are predicted.

  In the first embodiment, hot water supply load predicting means 104 adopts the maximum of all past hot water supply load integrated values as the total hot water load integrated value on the day including the current time, and predicts 425L. Yes.

  Further, the hot water supply load prediction unit 104 predicts each hot water supply based on the storage information of the hot water supply load storage unit 103.

  In the first embodiment, the hot water supply load integrated value that becomes the maximum on the day is the maximum value (here, 320 L) among the hot water supply load integrated values of the maximum hot water supply in each past unit period. . Further, the hot water supply end time that is the maximum on the day is the earliest time (here, 19:00) among the maximum hot water supply end times in each past unit period.

In addition, “other hot water supply” on the day is selected in order from the one with the largest hot water supply load integrated value. The “other hot water supply” of the day is employed until the sum of the hot water supply load integrated values predicted for the hot water on the day is approximately equal to the total hot water load integrated value predicted for the day.
Note that “other hot water supply” on the day may be selected in order from the earliest end time, for example.
In order to maximize the safety of running out of hot water, the “other hot water supply” on the day may adopt all the past “other hot water supply” results as the predicted hot water supply.
Further, in the first embodiment, the “end time” of each hot water supply is stored and predicted in order to make the activation of the heating means 2 closest to the predicted hot water supply. However, the present invention is not limited to this, and “end time” may be substituted by “start time”, or an average of these may be substituted.

[Calculation of startup time]
Next, an operation for calculating the activation time of the heating means 2 based on the predicted hot water supply load (hereinafter also referred to as “predicted hot water supply load”) will be described.

FIG. 7 is a time chart showing a starting method of the heating means 2 according to the first embodiment of the present invention.
FIG. 7 shows the end time and the hot water supply load integrated value for each hot water predicted by the hot water supply load predicting means 104 by “◇” marks.
FIG. 7 shows an example of the amount of heat stored in the hot water storage tank 1 with a thick line. (Here, the case of a heat storage amount of about 75 L at 12:00 is shown.)
In addition, FIG. 7 shows a boil-up heat amount integrated value (heat storage amount) when the heating means 2 is boiled at a heating capacity of 1.5 L / min by a thick broken line. FIG. 7 shows the accumulated heat value of the heating means 2 from a plurality of times. For example, when the heating means 2 is activated from 16:15 (the rightmost thick broken line shown in FIG. 7), the heat storage amount of the hot water storage tank 1 at 17:00 is 140L.

In addition, FIG. 7 shows that the maximum predicted hot water supply for the day is 19:00, 320L described above,
“Other hot water supply” shows an example in which all of the past “other hot water supply” results are adopted as the predicted hot water supply.

In general, the time interval between the hot water filling of the bath, which is the largest hot spring in a day, and the first shower after the hot water filling is often short.
However, in the prior art (for example, Patent Document 1), the prediction of the next large hot water is performed after the correspondence to the most predicted large hot water is completed (for example, refer to paragraph [0141] of Patent Document 1).
For this reason, for example, when the time interval between the large hot springs is short, even if the hot water does not run out in the latest hot springs, there is a possibility that the hot water runs out during the next hot spring.
The startup time calculation operation in the first embodiment for preventing such hot water shortage will be described.

In the first embodiment, the activation time of the heating means 2 is calculated so that hot water does not run out for any predicted hot water supply load.
That is, in this Embodiment 1, the hot water supply which runs out of hot water when it treats as a single hot water supply on the basis of the heating capability of the heating means 2 is combined as a single hot water supply group (a hot water supply group combining process is performed). ). And the hot water supply load memory | storage means 103 has memorize | stored the hot water supply information after a hot water supply group coupling | bonding process, and makes it possible to handle each hot water supply independently.

Therefore, as shown in FIG. 7, the heating control means 105 handles each predicted hot water independently obtained from the hot water supply information after the hot water supply group coupling process, and stores the heat stored in the hot water storage tank 1 more than the hot water load integrated value of each predicted hot water. The starting time of the heating means 2 can be obtained so as to be larger than the amount. And the control means 100 starts the heating means 2 at the starting time calculated | required by the heating control means 105. FIG.
In addition, you may make it perform this operation | movement calculation operation | movement sequentially according to the start of a unit period, arbitrary time, or prediction hot water supply.

  It is assumed that the heating capability of the heating unit 2 according to Embodiment 1 is stable and shows a constant value immediately after the heating unit 2 is started. Not limited to this, the heating capability of the heating means 2 is more realistic, for example, assuming that the heating capability is zero for a predetermined period after activation, or a linear increase function that becomes a stable value after a predetermined period after activation. It may be assumed as a capability.

As described above, in the first embodiment, for each predicted hot water supply load from the current time to the end of the unit period, the amount of heat stored in the hot water storage tank 1 at the end time of the hot water supply (from the start time). The sum of the amount of heat that can be boiled by the heating means 2 and the amount of heat stored in the hot water storage tank 1 at the start-up time) until the predicted hot water supply load ends is larger than the hot water supply load integrated value of the hot water supply. The starting time of the heating means 2 is obtained.
According to the first embodiment, hot water supply load patterns in which large hot water supply occurs at short time intervals are handled together and stored and predicted, so that the possibility of hot water shortage can be reduced.
In addition, the heat storage loss in the hot water storage tank 1 can be minimized and the heat radiation loss can be minimized.
Thereby, the hot water storage type hot-water supply system with high energy saving property is realizable.

In addition, the case where the heating capability of the heating means 2 is smaller than the hot water supply load in which the application of the present invention is assumed is particularly frequent when the heating means 2 is constituted by a heat pump cycle.
Therefore, the effect in the first embodiment is particularly remarkable when the heating means 2 is a heat pump cycle.

  Moreover, in this Embodiment 1, when it determines with the boiling by the heating means 2 being unnecessary based on the predicted value of the total hot water supply load integrated value in a unit period, the predicted hot water after the present time is deleted or reduced. .

Specifically, the heating control unit 105 subtracts the actual value of the total hot water supply load integrated value from the start of the unit period to the current time from the total hot water supply load integrated value predicted by the hot water supply load predicting unit 104.
When the subtracted value is equal to or less than the heat storage amount in the hot water storage tank 1 at the current time, the heating control unit 105 determines that the hot water supply after that is approximately sufficient for the heat storage amount at the current time. Then, the heating control means 105 deletes or reduces the predicted hot water supply so that the preliminary boiling operation for the predicted hot water supply is not performed.

According to the first embodiment, boiling of hot water that is not used during the unit period can be suppressed, and energy loss due to heat radiation from the hot water storage tank 1 to the outside can be suppressed.
Therefore, it is possible to realize a hot water storage hot water supply system with high energy saving performance.

  In particular, as the “other hot water supply” of the day, in order to minimize the risk of running out of hot water as in the case where all of the past “other hot water supply” results have been adopted as the predicted hot water supply, This operation is suitable for cases where the amount of heat generated is likely to be excessive.

Embodiment 2. FIG.
In this Embodiment 2, the operation | movement which sets the boiling temperature of the heating means 2 based on the memory | storage information of the past hot water supply load is demonstrated.
In addition, the structure of the hot water storage type hot-water supply system in this Embodiment 2 is the same as that of the said Embodiment 1, and attaches | subjects the same code | symbol to the same part.

First, an operation for calculating the optimum boiling temperature for the hot water supply load based on the stored information of the past hot water supply load will be described.
FIG. 8 is a schematic diagram showing a method for calculating the amount of heat stored in the hot water storage tank according to Embodiment 2 of the present invention. In the second embodiment, the amount of heat that needs to be stored in the capacity of the hot water storage tank 1 in order to cover the hot water supply load based on the stored past hot water supply results is obtained from the quantitative relationship between the actual hot water supply load and the heating capacity. Arithmetic. That is, the amount of heat that needs to be stored within the capacity of the hot water storage tank 1 to cover the hot water supply load (the amount of heat that needs to be stored in the hot water storage tank 1) based on the amount of change in the accumulated value of the hot water supply load in the past and the heating capacity of the heating means 2. ). Here, the heating capacity of the heating means 2 is assumed to be 2 L / min.

  In FIG. 8, the unit period is divided into predetermined time intervals, and the amount of heat that needs to be stored in the hot water storage tank 1 is calculated at each predetermined time interval. Further, the predetermined time interval is from the start of change of the hot water supply load integrated value to the end of change (from the start to the end of hot water supply). When the change amount of the hot water supply load integrated value is equal to or greater than the predetermined change amount, a plurality of hot water supplies are set at predetermined time intervals. As in the first embodiment, the combination process may be performed with a plurality of hot water supplies as one hot water supply group.

For example, a case where a predetermined time interval is set from the time (20:40) indicated by “◯” to the time (21:20) indicated by “◇” in the figure.
The hot water supply load integrated value during the time interval is as shown by a solid line. Further, the amount of heat that can be boiled by the heating means 2 during the time interval is as shown by a one-dot chain line. Therefore, the maximum difference between the two values is the amount of heat that needs to be stored in the hot water storage tank 1.

  Here, the difference between the hot water supply load integrated value during the time interval and the amount of heat that can be raised by the heating means 2 during the time interval is maximized at the end of the change of the hot water load integrated value (at the end of hot water supply). Often becomes. For this reason, in the second embodiment, the amount of heat that can be raised by the heating means 2 at the end of the change of the hot water supply load integrated value is subtracted from the hot water supply load integrated value at the end of the change of the hot water supply load integrated value. The amount of heat that needs to be stored in 1 is calculated.

For example, the hot water supply load integrated value during the time interval is 200L. The amount of heat that can be boiled by the heating means 2 during the time interval is 80L. From these values, the amount of heat that needs to be stored in the hot water storage tank 1 is the amount of heat (80 L) that can be boiled by the heating means 2 during the time interval from the hot water supply load integrated value (200 L) during the time interval. , And obtained as a subtracted value (120L: thick double arrow in the figure).
This value is the amount of heat Q that needs to be stored in the hot water storage tank 1 separately from the amount of boiling heat by the heating means 2 in order to cover the hot water supply between “◯” and “◇” in the figure.

  By calculating the amount of heat that needs to be stored in the hot water storage tank 1, the number of detections can be reduced.

  FIG. 8 shows two more examples as other specific examples. At a predetermined time interval in which “●” and “◆” are connected by a one-dot chain line, the amount of heat Q that needs to be stored in the hot water storage tank 1 is a value indicated by a thick double arrow.

Next, the optimum boiling temperature in a certain predetermined time zone is calculated. For example, the amount of heat Q that needs to be stored in the hot water storage tank is obtained for each predetermined time interval in the time zone. Then, an optimum boiling temperature in a certain predetermined time zone is obtained so that the maximum value Qmax of all of them is stored in the hot water storage tank.
Here, for example, the boiling temperature Tp of hot water necessary for storing the maximum heat quantity Qmax in the capacity of the hot water storage tank 1 is, for example, the capacity V of the hot water storage tank 1 and the temperature of the city water to be heated. From Tw, density and specific heat,
Tp = Tw + Qmax / V / density / specific heat.

  From the viewpoint of preventing reproduction of Legionella, the lower limit of the boiling temperature Tp may be set to 65 ° C., for example, if the calculation result is 65 ° C. or lower. Conversely, the upper limit of the boiling temperature Tp may be set to 90 ° C., for example, from the possible boiling temperature range of the heating means 2, the heat-resistant temperature range of the heat insulating material that suppresses heat dissipation from the hot water storage tank 1, and the like.

  Further, it is assumed that the heating capability of the heating unit 2 according to the second embodiment is stable and shows a constant value immediately after the heating unit 2 is started. Not limited to this, the heating capability of the heating means 2 is more realistic, for example, assuming that the heating capability is zero for a predetermined period after activation, or a linear increase function that becomes a stable value after a predetermined period after activation. It may be assumed as a capability.

  Further, in order to improve the stability of control and the safety of running out of hot water, the capacity V of the hot water storage tank 1 used for this calculation may be smaller than the actual capacity.

  Further, the predetermined time interval is not limited to the time interval shown in FIG. 8 and may be an arbitrary time interval. For example, you may divide | segment by a fixed time interval, such as making predetermined time interval into 2 hours. Further, for example, the predetermined time interval may be the above-mentioned “predetermined time zone” or “unit period”.

  In addition, the above-mentioned “predetermined time period” may be obtained by assuming that the boiling temperature is constant during a unit period, for example, from 0 o'clock to 24 o'clock or from 7 o'clock to 7 o'clock the next time. And may be obtained separately for low times. Moreover, it is good also as a time slot | zone divided | segmented finely like every hour.

  In addition, the setting of the boiling temperature on the current day based on the past actual hot water supply load is, for example, the maximum of the optimum boiling temperature calculated from the actual hot water load actual performance for each week in the past week. Adopt value. In addition, for example, the setting of the boiling temperature on the day may adopt a minimum value or an average value, giving priority to energy saving of the hot water storage hot water supply system.

  Various timings can be considered for the boiling timing (starting timing of the heating means 2). For example, the activation time of the heating unit 2 may be calculated according to the first embodiment. Further, for example, when the capacity V of the hot water storage tank 1 used in the above formula (1) is made smaller than the actual capacity, the heating means 2 is activated when the amount of hot water in the hot water storage tank becomes smaller than this capacity. Also good. Further, for example, the heating means 2 may be activated at the start time of a predetermined time interval used for calculating the boiling temperature.

  As described above, in the second embodiment, the amount of heat that needs to be stored within the capacity of the hot water storage tank to cover the hot water supply load based on the past change amount of the hot water supply load integrated value and the heating capability of the heating means 2 ( By calculating the amount of heat that needs to be stored in the hot water storage tank 1, the boiling temperature of the hot water by the heating means 2 can be determined to be as small as possible.

According to the second embodiment, it is possible to reduce the boiling temperature rather than determining the boiling temperature on the basis that the total hot water supply load integrated value for the unit period is stored in the capacity of the hot water storage tank as in the prior art. The energy loss due to heat radiation from the hot water storage tank 1 to the outside can be minimized.
Therefore, it is possible to realize a hot water storage hot water supply system with high energy saving performance.

  When the heating means 2 is constituted by a heat pump cycle, the reduction of the boiling temperature not only reduces the heat dissipation loss from the hot water storage tank, but also greatly improves the operating efficiency of the heating means 2 (per 1 ° C reduction in boiling temperature). The device efficiency of the heating means 2 is improved by about 1%). For this reason, when the heating means 2 is comprised by a heat pump cycle, the effect in this Embodiment 2 is especially remarkable.

Embodiment 3 FIG.
In this Embodiment 3, the operation | movement which starts the heating means 2 based on the memory | storage information of the past hot water supply load is demonstrated. In the third embodiment, a starting heat storage amount serving as a reference value for starting determination of the heating means 2 is set based on the stored information of the past hot water supply load. And the heating means 2 is started when the heat storage amount of the hot water storage tank 1 at the current time becomes equal to or less than the startup heat storage amount.
In addition, the structure of the hot water storage type hot water supply system in this Embodiment 3 is the same as that of the said Embodiment 1 and the said Embodiment 2, and attaches | subjects the same code | symbol to the same part.

  First, an operation for calculating the amount of heat (hereinafter, required amount of heat storage) that needs to be stored in the hot water storage tank 1 at each time based on the stored information of the past hot water supply load will be described.

FIG. 9 is a schematic diagram showing a method for calculating the amount of heat stored in the hot water storage tank according to Embodiment 3 of the present invention.
Fig.9 (a) has shown the total hot water supply integrated value and the boiling heat amount integrated value (integrated value of the amount of heat which can be heated by the heating means 2) in a unit period (for example, 1 day). The boiling heat amount integrated value is set so that hot water does not run out after the end of each hot water supply.
FIG. 9B is an enlarged view of a range indicated by a broken line in FIG.
FIG. 9C shows the necessary heat storage amount Lreq in a unit period (for example, one day).

  A general hot water storage type hot water supply system has a heating capacity of the heating means 2 (for example, 4 kW to 8 kW = 1.74 L / day) with respect to a normal hot water supply amount (for example, 10 L / min = 23 kW) in winter (for example, a water supply temperature of 9 ° C.). min to 3.48 L / min) is small. For this reason, it is necessary to start boiling before the load is generated and store hot water to be used in the hot water storage tank 1 in advance.

Therefore, in the third embodiment, the amount of heat that needs to be stored in the hot water storage tank 1 in advance to cover the hot water supply load is calculated at each time based on the stored past hot water supply results and the heating capability of the heating means 2. ing.
Specifically, a hot water supply load integrated value (a change amount of the integrated value of the hot water load) at a predetermined time interval is obtained. Then, at each time within a predetermined time interval, the necessary heat storage amount at each time can be obtained as the difference between the total hot water supply load integrated value at that time and the boiling heat amount integrated value at that time.

Next, the operation | movement which sets the starting heat storage amount used as the reference value of the starting determination of the heating means 2 is demonstrated.
The necessary heat storage amount is a minimum heat storage amount in consideration of the heating capability of the heating means 2. In other words, it means that if the heat storage amount in the hot water storage tank 1 becomes equal to or less than the necessary heat storage amount at each time and the heating means 2 is activated, hot water shortage can be avoided.
Therefore, in order to ensure avoidance of hot water shortage, the startup heat storage amount at each time (the reference value for the startup determination of the heating means 2) is set to be equal to or greater than the calculated necessary heat storage amount at each time.
Further, in order to avoid excessive boiling of hot water, the startup heat storage amount at each time is set to a value as close as possible to the calculated necessary heat storage amount.

  That is, the startup heat storage amount serving as the reference value for the startup determination of the heating means 2 is calculated based on the time change of the required heat storage amount. In the third embodiment, for example, the startup heat storage amount is calculated as follows.

10 and 11 are schematic diagrams showing a method for setting the startup heat storage amount Lon from the necessary heat storage amount Lreq according to Embodiment 3 of the present invention.
In particular, FIG. 10 shows a method of extracting a feature amount used when setting the startup heat storage amount Lon from the necessary heat storage amount Lreq, and FIG. 11 shows the feature amount extracted from the actual hot water supply load for several days in the past. The method of using and setting the starting heat storage amount Lon specifically is shown. FIG. 11 shows three examples (FIGS. 11A to 11C) as a method for setting the startup heat storage amount Lon.

As shown in FIG. 10, the control unit 100 extracts the following feature amount from the necessary heat storage amount Lreq in a unit period (for example, one day), for use when setting the startup heat storage amount Lon.
The maximum value of the required heat storage amount Lreq in the unit period (for example, one day) is extracted as the maximum required heat storage amount Lreq_max.
Further, the time when the required heat storage amount Lreq indicates the maximum required heat storage amount Lreq_max is extracted as the maximum load occurrence time t_Lmax.
Further, from the time before the maximum load occurrence time t_Lmax, the time at which the required heat storage amount Lreq is finally zero is extracted as the maximum load group start time ts_Lmax.
In addition, from the time after the maximum load occurrence time t_Lmax, the time when the required heat storage amount Lreq is first zero is extracted as the maximum load group end time te_Lmax.
Further, the second largest maximum value of the required heat storage amount Lreq in the unit period (for example, one day) is extracted as the second required heat storage amount Lreq_2max.

  The second necessary heat storage amount Lreq_2max is extracted from a range that is not between the maximum load group start time ts_Lmax and the maximum load group end time te_Lmax. This is because the required heat storage amount Lreq between the maximum load group start time ts_Lmax and the maximum load group end time te_Lmax is likely to be large due to the influence of the maximum required heat storage amount Lreq_max. For this reason, when lowering the startup heat storage amount Lon and saving energy as described later, it is inappropriate for extraction of the second required heat storage amount Lreq_2max as a reference.

  Next, a method of setting the startup heat storage amount Lon of the day using the feature values of the past several days extracted as shown in FIG. 10 will be exemplified.

For example, as shown in FIG. 11A, the startup heat storage amount Lon may be set based on the maximum required heat storage amount Lreq_max.
In FIG. 11A, the maximum required heat storage amount Lreq_max is obtained from the maximum required heat storage amount Lreq_max of the past several days. Then, in all the periods in the unit period (for example, one day), the startup heat storage amount Lon is set to be “the maximum value of the maximum required heat storage amount Lreq_max in the past several days + margin”.
In order to save energy, the startup heat storage amount Lon may be set as “average value of the maximum required heat storage amount Lreq_max in the past several days + margin”. Further, the startup heat storage amount Lon may be set as “the average value of the maximum required heat storage amount Lreq_max in the past several days + standard deviation”.

Further, for example, as shown in FIG. 11B, the startup heat storage amount Lon may be set based on the maximum required heat storage amount Lreq_max, the maximum load group end time te_Lmax, and the second required heat storage amount Lreq_2max.
In FIG. 11B, at the time before “latest value of maximum load group end time te_Lmax of several days in the past + margin”, the startup heat storage amount Lon is “maximum of the maximum required heat storage amount Lreq_max of the past days”. Value + margin ”. At the time after that, the startup heat storage amount Lon is set to be “the maximum value of the second required heat storage amount Lreq — 2max of the past several days + margin”.

  In order to save energy, the start-up heat storage amount Lon at a time before “latest value of maximum load group end time te_Lmax of several days in the past + margin” is an average value of the maximum required heat storage amount Lreq_max as described above. You may set based on a standard deviation. Similarly, the startup heat storage amount Lon at a time after “the latest value of the maximum load group end time te_Lmax of the past several days + margin” is set based on the average value or standard deviation of the second required heat storage amount Lreq_2max. Also good. The time for switching the startup heat storage amount Lon may be “average value of maximum load group end time te_Lmax for several days in the past + margin” or “average value of maximum load group end time te_Lmax for some days in the past + It may be a “standard deviation”.

Further, for example, as shown in FIG. 11C, the startup heat storage amount Lon is set based on the maximum required heat storage amount Lreq_max, the maximum load group end time te_Lmax, the second required heat storage amount Lreq_2max, and the maximum load group start time ts_Lmax. May be.
In FIG. 11C, at the time after “the fastest value of the maximum load group start time ts_Lmax for some days in the past—margin” and before the “latest value of the maximum load group end time te_Lmax for some days in the past + margin”. Is set so that the startup heat storage amount Lon becomes “the maximum value of the second required heat storage amount Lreq — 2max of the past several days + margin”. At other times, the startup heat storage amount Lon is set to be “the maximum value of the second required heat storage amount Lreq — 2max of some past days + margin”.

  In order to save energy, the time after “the fastest value of the maximum load group start time ts_Lmax for some days in the past—margin” and before the “latest value of the maximum load group end time te_Lmax for some days in the past + margin”. The startup heat storage amount Lon at may be set based on the average value or standard deviation of the maximum required heat storage amount Lreq_max as described above. Similarly, the startup heat storage amount Lon at other times may be set based on the average value or standard deviation of the second required heat storage amount Lreq_2max. The time for increasing the startup heat storage amount Lon may be “average value of maximum load group start time ts_Lmax for several days in the past—margin” or “average value of maximum load group end time te_Lmax for some days in the past”. -"Standard deviation". The time for reducing the startup heat storage amount Lon may be “average value of maximum load group end time te_Lmax for several days in the past + margin” or “average value of maximum load group end time te_Lmax for several days in the past”. It may be “+ standard deviation”.

  In addition, the feature-value for setting the starting heat storage amount Lon is not limited to the above example. What is necessary is just the feature quantity which can set starting heat storage amount Lon so that starting heat storage amount Lon becomes more than required heat storage amount Lreq at all times. For example, the time zone may be divided in advance every hour, and the maximum value of the required heat storage amount Lreq in that time zone may be used as the feature amount. And what is necessary is just to set the starting heat storage amount Lon based on this feature-value.

Further, the switching time of the startup heat storage amount Lon is not limited to the above example. If it can be determined that the amount of heat for the day has been prepared based on the results of the hot water supply load on the day, the startup heat storage amount Lon may be lowered.
For example, “LA which is the total hot water load integrated value from the hot water load integration start time of the day to the current time + Lt which is the heat storage amount in the hot water storage tank 1 at the current time” is “heat storage at the hot water load integration start time of the day It is equivalent to the quantity Lt + the integrated heat quantity boiled by the heating means after that—the heat radiation loss ”. In other words, this value means the integrated heat quantity that has been prepared for the use of hot water on that day.
Therefore, if this value is larger than the maximum value of the total hot water supply load integrated values LA for several days stored in the hot water supply load storage means 103, it is determined that the heat amount for the day has been prepared, and the startup heat storage amount Lon May be lowered.
An average value or a minimum value may be adopted instead of the maximum value of the total hot water supply load integrated value LA for several days in the past.

Moreover, if it can be determined that the amount of heat (predetermined value) for the maximum load group has been prepared based on the results of the hot water supply load on that day, the startup heat storage amount Lon may be lowered.
For example, the necessary heat storage amount Lreq every moment until the current time on the day is calculated based on the actual hot water supply load on the day. Then, if there is a value exceeding the maximum value of the second required heat storage amount Lreq — 2max for some days in the required heat storage amount Lreq from the hot water supply load integration start time of the day to the current time, the required heat storage amount Lreq is indicated. It is determined that the hot water supply is part of the maximum load group of the day.
“Integrated value of hot water supply load from start time of load determined to be included in maximum load group to current time + heat storage amount Lt in hot water storage tank 1 at current time” is “heat storage at start time of maximum load group” This is equivalent to “quantity Lt + accumulated heat amount heated by the heating means after that−heat radiation loss”. In other words, this value means the integrated heat quantity that has been prepared for the maximum load group of the day.
Therefore, if this value exceeds the amount of heat that covers the maximum load group, the startup heat storage amount Lon may be lowered.

In addition, the integrated heat amount (heat amount covering the maximum load group) that has been prepared for the maximum load group may be a predetermined value such as “hot water (180 L) + shower (50 L) × 2 times”, for example. Good.
Further, the integrated value of the hot water supply load determined to be part of the maximum load group is added to one of the stored information of the hot water supply load storage means 103, and based on the maximum value, average value, minimum value, etc. therein The startup heat storage amount Lon may be lowered.

  Moreover, the threshold value used for the extraction of the maximum load group of the day is “the average value of the second required heat storage amount Lreq — 2max of the past several days” instead of “the maximum value of the second required heat storage amount Lreq — 2max of the past several days”. Or “average value of second required heat storage amount Lreq — 2max of several days in the past + standard deviation”. The thresholds used for the extraction of the maximum load group on the current day are “the minimum value of the maximum required heat storage amount Lreq_max for the past several days”, “the average value of the maximum required heat storage amount Lreq_max for the past days”, “ The average value of the maximum required heat storage amount Lreq_max—the standard deviation ”may be used. As the threshold used for extracting the maximum load group on the day, a predetermined value such as 100 L may be used assuming hot water filling.

  Further, the values after the start-up heat storage amount Lon is lowered are “the maximum value of the second required heat storage amount Lreq — 2max for the past several days”, “average value of the second required heat storage amount Lreq — 2max for the past several days”, “the past It is good also as "the average value + standard deviation of the 2nd required heat storage amount Lreq_2max of several days" etc.

  Further, it is assumed that the heating capability of the heating unit 2 according to the third embodiment is stable and shows a constant value immediately after the heating unit 2 is started. Not limited to this, the heating capability of the heating means 2 is more realistic, for example, assuming that the heating capability is zero for a predetermined period after activation, or a linear increase function that becomes a stable value after a predetermined period after activation. It may be assumed as a capability.

  Further, in order to increase the stability of control and the safety of running out of hot water, a value smaller than the actual capacity may be adopted as the capacity V of the hot water storage tank 1 used for this calculation.

As described above, in the third embodiment, the amount of heat Lreq that needs to be stored in the hot water storage tank 1 at the minimum in order to cover the hot water supply load based on the amount of change in the past hot water supply load integrated value and the heating capability of the heating means 2. And the startup heat storage amount Lon is set as small as possible based on the necessary heat storage amount Lreq. For this reason, the heat storage amount in the hot water storage tank 1 can be made as small as possible, and the energy loss due to heat radiation from the hot water storage tank 1 to the outside can be minimized.
Therefore, it is possible to realize a hot water storage hot water supply system with high energy saving performance.

In addition, the case where the heating capability of the heating means 2 is smaller than the hot water supply load, in which the invention according to the third embodiment is assumed, is particularly frequent when the heating means 2 is configured by a heat pump cycle.
When the temperature of the water led from the lower part of the hot water storage tank 1 to the heat pump cycle is high, the efficiency of the heat pump cycle is lowered. However, by suppressing the amount of heat stored in the hot water storage tank 1 by implementing the invention according to the third embodiment, the temperature rise of the water stored in the lower part of the hot water storage tank 1 can be suppressed, and the heat pump is highly efficient. The cycle can be run.
Therefore, the effect in the third embodiment is particularly remarkable when the heating means 2 is a heat pump cycle.

Embodiment 4 FIG.
In the fourth embodiment, the hot water in the hot water storage tank 1 is supplied to the load side by discharging the hot water, and the hot water in the hot water storage tank 1 is exchanged by heat exchange between the hot water and the object. It is also possible to implement the invention shown in the first to third embodiments with respect to a hot water storage hot water supply system having both a heat exchanger supplied to the load side.
In the fourth embodiment, items that are not particularly described are the same as those in the first to third embodiments.

  FIG. 12 is a configuration diagram of a hot water storage type hot water supply system according to Embodiment 4 of the present invention. In addition to the configuration of the hot water storage hot water supply system according to the first embodiment, the hot water storage hot water supply system according to the fourth embodiment performs heat exchange between the hot water in the hot water storage tank 1 and the water (object) flowing through the heating terminal 15. A heat exchanger 11 is provided.

One end of the flow path on the hot water supply system side of the heat exchanger 18 is connected to the outlet pipe 303 via the outlet pipe 311, and the other end is connected to the hot water storage tank 1 via the return pipe 312. For example, it is connected to the lower part. The heat exchanger 18 is also connected to the heating terminal 15 via the heating circuit 313.
The return pipe 312 is provided with a circulation pump 12 for flowing hot water in the hot water storage tank 1 to the heat exchanger 11. The return pipe 312 is also provided with an on-off valve 13.
The heating circuit 313 is provided with a circulation pump 14 that circulates the water in the heating terminal 15.

  When the on-off valve 13 is opened, the high-temperature hot water stored in the hot water storage tank 1 flows into the heat exchanger 11 through the lead-out pipe 303 and the lead-out pipe 311. The hot water flowing into the heat exchanger 11 dissipates heat to the water flowing through the heating circuit 313 (heats the water flowing through the heating circuit 313) and flows out of the heat exchanger 11. Hot water that has flowed out of the heat exchanger 11 returns to the hot water storage tank 1 via the return pipe 312.

  FIG. 13 is a block diagram showing a signal flow according to Embodiment 4 of the present invention. As described above, the hot water storage type hot water supply system according to the fourth embodiment is provided with the heat exchanger 11 that performs heat exchange between the hot water in the hot water storage tank 1 and the water (object) flowing through the heating terminal 15. . For this reason, the hot water supply load calculating means 102 of the control means 100 includes a hot water tap load calculating means 102a for obtaining the actual result of the hot water tap load, which is the amount of heat supplied from the hot water tap to the load side per unit time, and the heat exchanger 11. In order to supply heat to the heating terminal 15 side (load side), a heat exchange load calculating means 102b is provided for obtaining a record of the amount of heat (heat exchange load) lost from the hot water storage tank 1 per unit time.

  The operations other than the portion where the hot water supply load calculating means 102 calculates the hot water supply load are the same as those in the first to third embodiments. Therefore, hereinafter, the operation of the portion where the hot water supply load calculating means 102 calculates the hot water supply load will be described.

The hot water supply load calculating means 102 calculates the hot water supply load by adding the hot water tap load calculated by the hot water tap load calculating means 102a and the heat exchange load calculated by the heat exchange load calculating means 102b.
The heat exchange load calculating means 102b calculates the heat exchange load according to "the amount of decrease in the amount of heat stored in the hot water storage tank 1 per unit time-the tap load per unit time + the amount of heat raised by the heating means 2 per unit time". Is calculated.

  In addition, when calculating the amount of heat that the heating means 2 has boiled, depending on the configuration of the hot water storage hot water supply system, it may be necessary to add a sensor or the like. For this reason, the heat exchange load may be calculated based on the product of the temperature change amount of the object heat exchanged with the hot water in the hot water storage tank 1 and the heat capacity of the object (object supply heat amount).

  In general, the heat storage amount calculation means 101 often calculates the heat storage amount by integrating the amount of heat that only hot water having a predetermined effective temperature or higher among the hot water in the hot water storage tank 1 has. In this case, when hot water whose temperature has decreased due to heat exchange returns to the hot water storage tank 1, hot water having a temperature higher than the water supply temperature and lower than the effective temperature increases in the hot water storage tank 1. For this reason, the amount of decrease in the heat storage amount in the hot water storage tank 1 calculated by the heat storage amount calculation means 101 is a value greater than the amount of heat supplied to the object.

  Therefore, when the heat storage amount calculation unit 101 calculates the heat storage amount by integrating the heat amount of only hot water having a predetermined effective temperature or higher in the hot water storage tank 1, the heat exchange load calculation unit 102b adds 1 to the target supply heat amount. The heat exchange load may be calculated by multiplying the above heat exchange load coefficient.

  Here, the heat exchange load coefficient may be given a predetermined fixed value, or may be changed according to the temperature distribution of the hot water in the hot water storage tank 1.

FIG. 14 is a schematic diagram illustrating an example of a heat exchange load coefficient setting method according to Embodiment 4 of the present invention. FIG. 14 shows the heat exchange load coefficient when the temperature of hot water led out from the hot water storage tank 1 to the heat exchanger 11 and the temperature in the tank of the portion to which the return pipe 312 is connected are changed under certain conditions. The value of is shown.
For example, as shown in FIG. 14, the correlation between the boiling temperature of the heating means 2 and the temperature in the tank of the portion to which the return pipe 312 is connected and the heat exchange load coefficient are set in advance at the design stage. And when the heat exchange load calculation means 102b calculates heat exchange load by actual control, you may determine the said heat exchange load coefficient based on the said correlation.

As described above, in the fourth embodiment, the hot water supply load is calculated by adding the heat exchange load and the tap load. In the hot water storage hot water supply system that covers the heat exchange load by collectively treating the heat exchange load and the tap load as the amount of heat lost from the hot water storage tank 1, the effects shown in the first to third embodiments are also achieved. Can be played.
Therefore, it is possible to realize a hot water storage hot water supply system with high energy saving performance.

Moreover, the boiling of the heating means 2 is calculated by calculating the heat exchange load on the basis of the product of the temperature change amount of the object exchanged with the hot water in the hot water storage tank 1 and the heat capacity of the object (object supply heat amount). There is no need to add a new sensor or the like to calculate the increased amount of heat. For this reason, the heat exchange load can be calculated at low cost.
Therefore, it becomes easier to introduce a hot water storage hot water supply system with high energy saving performance.

In addition, the heat exchange load coefficient, which is the ratio between the amount of heat supplied to the object and the heat exchange load, is calculated based on the temperature distribution of the hot water stored in the hot water storage tank 1, so that the heat exchange load coefficient is accurately obtained. Can be calculated. For this reason, it is possible to avoid excessive boiling by estimating the heat exchange load excessively.
Therefore, it is possible to realize a hot water storage hot water supply system with high energy saving performance.

In addition, the case where the heating capability of the heating means 2 is smaller than the hot water supply load in which the application of the present invention is assumed is particularly frequent when the heating means 2 is constituted by a heat pump cycle.
Therefore, the effect in the fourth embodiment is particularly remarkable when the heating means 2 is a heat pump cycle.

  DESCRIPTION OF SYMBOLS 1 Hot water storage tank, 2 Heating means, 3 Circulation pump, 4 Mixing means, 11 Heat exchanger, 12 Circulation pump, 13 On-off valve, 14 Circulation pump, 15 Heating terminal, 100 Control means, 101 Heat storage amount calculation means, 102 Hot water supply load Calculation means, 102a Hot water tap load calculation means, 102b Heat exchange load calculation means, 103 Hot water supply load storage means, 104 Hot water supply load prediction means, 105 Heating control means, 301 Heating pipe, 302 Water supply pipe, 303 Derivation pipe, 304 Pipe for mixing, 305 Hot water supply pipe, 311 Derived pipe, 312 Return pipe, 313 Heating circuit, 501a to 501f Hot water storage temperature sensor, 502 Boiling temperature sensor, 503 Derived temperature sensor, 504 Hot water temperature sensor, 505 Hot water temperature sensor, 601 Hot water flow rate sensor.

Claims (11)

Heating means for heating the water to hot water;
A hot water storage tank for storing the hot water;
Control means for controlling the operation of the heating means;
With
The control means includes
A heat storage amount calculating means for obtaining a heat storage amount in the hot water storage tank;
A hot water supply load calculating means for obtaining a result of the hot water supply load which is the amount of heat lost from the hot water storage tank per unit time;
Hot water supply load storage means for storing information related to the hot water supply load obtained by the hot water supply load calculation means;
Have
The hot water load storage means is
Storing information necessary to identify the amount of change in the integrated value of the hot water supply load during the unit period;
The control means includes
Based on the storage information of the hot water supply load storage means and the heating capacity of the heating means, a necessary heat storage amount that needs to be stored in the hot water storage tank is calculated,
Based on the calculated required heat storage amount, calculate a startup heat storage amount for determining the start of the heating means,
The hot water storage type hot water supply system , wherein the heating means is activated when the amount of heat stored in the hot water storage tank becomes equal to or less than the amount of stored heat .   The control means extracts a feature amount from the calculated necessary heat storage amount, and calculates the startup heat storage amount based on the feature amount,
  The feature amount is
  Maximum required heat storage amount that is the maximum value of the required heat storage amount in a unit period; and
  A maximum load occurrence time which is a time when the required heat storage amount indicates the maximum required heat storage amount; and
  Maximum load group start time that is a time before the maximum load occurrence time and is the time when the required heat storage amount finally shows zero,
  Maximum load group end time, which is a time after the maximum load occurrence time and is a time at which the necessary heat storage amount first shows zero,
  A second required heat storage amount that is the second largest maximum value of the required heat storage amount in a unit period;
  Including at least one of
  The hot water storage type hot water supply system according to claim 1.   The feature amount includes the maximum required heat storage amount, the maximum load group start time, the maximum load group end time, and the second required heat storage amount.
  The hot water storage type hot water supply system according to claim 2. The control means includes
Obtain an integrated value of the hot water supply load at a predetermined time interval,
Find the integrated value of the amount of heat that can be raised by the heating means, which is equal to or greater than the integrated value of the hot water supply load,
Calculate the difference between the integrated value of the hot water supply load and the integrated value of the amount of heat that the heating means can boil,
The hot water storage hot water supply system according to any one of claims 1 to 3, wherein the calculated value is set as a necessary heat storage amount. The control means is based on the required heat storage amount,
The hot water storage system according to any one of claims 1 to 4 , wherein a startup heat storage amount is set for each predetermined time period. The hot water load storage means is
Memorize the maximum load group of hot water performed during the past unit period,
The control means includes
The integrated value of the hot water supply load generated from the start time of the unit period including the current time to the current time, the maximum load group in the past unit period stored in the hot water load storage means, and the hot water storage tank at the current time When it is determined that the heat storage for covering the maximum load group in the unit period including the current time has ended based on the amount of heat storage of
The hot water storage hot water supply system according to any one of claims 1 to 5 , wherein the startup heat storage amount is reduced. The hot water load storage means is
Store the total hot water load integrated value of hot water supply load integrated values of hot water performed during the past unit period,
The control means includes
The past unit period in which the sum of the accumulated value of the hot water load generated from the start time of the unit period including the current time to the current time and the amount of heat stored in the hot water storage tank at the current time is stored in the hot water load storage means If it is larger than the total hot water load integrated value in
The hot water storage system according to any one of claims 1 to 6 , wherein the startup heat storage amount is reduced. A hot water tap for supplying the amount of heat of hot water led out from the hot water storage tank to the load side by discharging hot water,
A heat exchanger for supplying the amount of heat of hot water derived from the hot water storage tank to the load side by heat exchange;
With
The hot water supply load calculating means includes:
A faucet load calculating means for obtaining a performance of a faucet load that is the amount of heat lost from the hot water storage tank by supplying heat from the faucet to the load side;
Heat exchange load calculating means for obtaining a record of heat exchange load that is the amount of heat lost from the hot water storage tank by supplying heat to the load side from the heat exchanger;
Have
The hot water supply load calculating means includes:
The hot water storage hot water supply system according to any one of claims 1 to 7, wherein the hot water supply load is calculated by adding the hot water tap load and the heat exchange load. The heat exchange load calculating means includes
Subtract the tap load per unit time from the decrease in the amount of heat stored in the hot water storage tank per unit time,
The hot water storage hot water supply system according to claim 8, wherein the heat exchange load is calculated by adding the calculated value and the amount of heat boiled by the heating unit per unit time. The heat exchange load calculating means includes
Calculate the product of the amount of change in temperature of the object to which the amount of heat is supplied from the heat exchanger and the heat capacity of the object,
The hot water storage hot water supply system according to claim 8, wherein the heat exchange load is calculated by multiplying the calculated value by a heat exchange load coefficient. Heating means for heating the water to hot water;
A hot water storage tank for storing the hot water;
Control means for controlling the operation of the heating means;
With
The control means includes
A heat storage amount calculating means for obtaining a heat storage amount in the hot water storage tank;
A hot water supply load calculating means for obtaining a result of the hot water supply load which is the amount of heat lost from the hot water storage tank per unit time;
Hot water supply load storage means for storing information related to the hot water supply load obtained by the hot water supply load calculation means;
Have
The hot water load storage means is
Storing information necessary to identify the amount of change in the integrated value of the hot water supply load during the unit period;
The control means includes
Based on the storage information of the hot water supply load storage means and the heating capacity of the heating means, a necessary heat storage amount that needs to be stored in the hot water storage tank is calculated,
Based on the calculated necessary heat storage amount, the heat storage amount in the hot water storage tank is controlled,
A hot water tap for supplying the amount of heat of hot water led out from the hot water storage tank to the load side by discharging hot water,
A heat exchanger for supplying the amount of heat of hot water derived from the hot water storage tank to the load side by heat exchange;
With
The hot water supply load calculating means includes:
A faucet load calculating means for obtaining a performance of a faucet load that is the amount of heat lost from the hot water storage tank by supplying heat from the faucet to the load side;
Heat exchange load calculating means for obtaining a record of heat exchange load that is the amount of heat lost from the hot water storage tank by supplying heat to the load side from the heat exchanger;
Have
The hot water supply load calculating means includes:
The hot water supply load is calculated by adding the tap load and the heat exchange load,
The heat exchange load calculating means includes
Calculate the product of the amount of change in temperature of the object to which the amount of heat is supplied from the heat exchanger and the heat capacity of the object,
The heat exchange load is calculated by multiplying the calculated value and the heat exchange load coefficient,
The heat exchange load calculating means includes
The hot water storage based on the temperature distribution of the hot water stored in the tank, savings hot type hot-water supply system and calculates the heat exchange load factor.

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