JP6052342B2 - Hot water storage hot water supply system - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply system.

  Hot water storage water heaters that store hot water in a tank and supply hot water from the tank to the demand end side are widely used. The hot water storage type hot water heater is a water heater of a system particularly suitable for one having a relatively small heating capacity of the heating means or one having a slow rise in capacity when the heating means is activated. In the hot water storage type water heater, it is necessary to boil hot water in advance by a heating means and store it in a tank so that the hot water does not run out due to the occurrence of a load. In a hot water storage type water heater, it is common to perform a boiling operation in the midnight hours when electricity charges are cheap and to store hot water in a tank, that is, to store heat in the tank.

  Assuming that hot water storage hot water heaters are used in each household in an apartment house, hot water heaters in all households are heating up at the time close to the end time of midnight hours, The overall power demand can be high. In such a case, in order to equalize power demand in such a case, a hot water heater control means connected to a plurality of hot water storage type hot water heaters so as to be able to communicate with each other is provided, and the timing of boiling operation at midnight is stored. The technique changed for every water heater is disclosed.

JP 2012-97949 A

  The situation where a plurality of hot water storage hot water heaters perform boiling operation at the same time is not limited to the midnight time zone, and is likely to occur even in a situation where, for example, the amount of stored heat that decreases during bathing in the evening is recovered. However, if the timing of the heating operation that recovers the heat storage amount that has decreased during bathing is simply shifted for each household, the recovery of the heat storage amount will not be in time for the hot water storage hot water heater in the household that has delayed the timing, leading to the occurrence of hot water shortages. there is a possibility. On the other hand, for safety reasons, if all hot water storage water heaters are operated so that all the load during the bathing time is heated and stored before the bathing time, the timing of the boiling operation is simply shifted for each household. It is possible to avoid boiling concentration while avoiding running out of hot water. However, in that case, since all the hot water storage type hot water heaters hold a large amount of heat storage in the tank for a long time, there is a problem that heat dissipation loss increases and energy saving of the entire system is reduced.

  The present invention has been made in order to solve the above-described problems, and suppresses the total power consumed by a plurality of hot water storage hot water heaters during a concentrated load time zone in which the load is concentrated, and raises the entire system. It aims at providing the hot water storage type hot-water supply system which can suppress quantity and can improve energy saving.

The hot water storage hot water system according to the present invention includes a plurality of hot water storage water heaters and an allowable total power that is a total power allowed to be consumed by the plurality of hot water storage water heaters during a preset concentrated load time zone. Based on the value and the number of hot water storage water heaters that are assumed to perform boiling operation at the same time during the concentrated load time, each hot water storage water heater performs the boiling operation during the concentrated load time. Limiting means for limiting power consumption or heating capacity when performing, and when the number of hot water storage hot water heaters that perform boiling operation during the concentrated load time period is less than the assumed simultaneous operation number, the limiting means is The restriction of the power consumption or the heating capacity of the hot water storage hot water heater that performs the boiling operation is relaxed within a range where the total power consumption of the hot water storage hot water heaters does not exceed the allowable total power .
Further, the hot water storage hot water system according to the present invention includes a plurality of hot water storage hot water heaters and an allowable total that is a total power allowed to be consumed by the plurality of hot water storage hot water heaters during a preset concentrated load time period. Based on the value of electric power and the number of hot water storage water heaters that are assumed to perform boiling operation at the same time during the concentrated load time, each hot water heater is heated during the concentrated load time. Limiting means for limiting power consumption or heating capacity when operating, and each hot water storage type hot water heater learns a load pattern which is a pattern of a generated load and a generated time zone Based on the learned load pattern and the normal heating capacity value, the normal starting heat storage amount is set as a threshold value for starting the boiling operation when the heat storage amount is reduced so that the hot water does not run out with respect to the load. Means to find Based on the learned load pattern and the value of the limited heating capacity, which is the heating capacity limited by the limiting means, the boiling operation is performed when the heat storage amount is reduced so that the hot water does not run out of the load. The means for obtaining the limited startup heat storage amount as a threshold value to start and when the time until the concentrated load time period starts is within a predetermined time, the heat storage amount is large between the normal startup heat storage amount and the limited startup heat storage amount And a control means for starting the boiling operation with the limited heating capacity when it becomes smaller than the above.
Further, the hot water storage hot water system according to the present invention includes a plurality of hot water storage hot water heaters and an allowable total that is a total power allowed to be consumed by the plurality of hot water storage hot water heaters during a preset concentrated load time period. Based on the value of electric power and the number of hot water storage water heaters that are assumed to perform boiling operation at the same time during the concentrated load time, each hot water heater is heated during the concentrated load time. Limiting means for limiting power consumption or heating capacity when operating, and a plurality of hot water storage water heaters are provided in each household, and each hot water storage water heater supplies water. A heating means for heating and a tank for storing hot water are provided.

  According to the present invention, it is possible to suppress the total power consumed by a plurality of hot water storage type hot water heaters during a concentrated load time zone in which the load is concentrated, and to suppress the amount of boiling in the entire system and improve energy saving. Become.

It is a block diagram which shows the hot water storage type hot-water supply system of Embodiment 1 of this invention. It is a block diagram of the hot water storage type hot water heater with which the hot water storage type hot water supply system of Embodiment 1 of this invention is provided. It is a block diagram showing the flow of the signal in the hot water storage type water heater in Embodiment 1 of this invention. It is a figure explaining the outline | summary of the heating operation of a midnight time zone. It is a figure explaining the outline | summary of an additional boiling operation and concentrated load time zone prior boiling operation. It is a figure explaining the outline | summary of the additional boiling operation in the hot water storage type hot water supply machine with which the hot water storage type hot water supply system of Embodiment 2 of this invention is provided.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
≪Device configuration≫
FIG. 1 is a configuration diagram showing a hot water storage type hot water supply system according to Embodiment 1 of the present invention. As shown in FIG. 1, the hot water storage hot water supply system 1 according to the first embodiment includes a centralized controller 7 and a plurality of hot water storage hot water heaters 8. A plurality of hot water storage type water heaters 8 are provided in each household of a facility such as an apartment house. FIG. 2 is a configuration diagram of a hot water storage type hot water heater 8 provided in the hot water storage type hot water supply system 1 of the first embodiment. Since the plurality of hot water storage type hot water heaters 8 included in the hot water storage type hot water supply system 1 have substantially the same configuration, only one of the hot water storage type hot water heaters 8 will be described as a representative.

  As shown in FIG. 2, the hot water storage type hot water heater 8 includes a tank 10, a heating means 20, a boiling pump 31, a reheating pump 32, a bathtub pump 33, a tap temperature control valve 41, a reheating heat exchanger 5, a boiling Upward piping 301a, boiling return piping 301b, feed water piping 302, high temperature outlet piping 303, temperature control piping 304, hot water tap piping 305, bathtub return piping 306a, bathtub return piping 306b, additional return piping 307a, additional return piping 307b, the individual control means 100, and the like.

  In the tank 10, hot water is stored by forming a temperature stratification in which the upper side is a high temperature and the lower side is a low temperature. The heating means 20 boils the water guided from the tank 10 to make high temperature water. The heating means 20 is configured using, for example, a heat pump. Moreover, it is preferable that the heating means 20 is a structure which can set a heating capability variably, for example using inverter control etc. The boiling forward piping 301 a guides the water in the tank 10 to the heating means 20. The boiling return pipe 301 b guides the high temperature water boiled by the heating means 20 to the tank 10. The water supply pipe 302 guides low temperature water supplied from a water source such as a water supply to the lower part of the tank 10.

  The high temperature outlet pipe 303 allows high temperature water led out from the upper part of the tank 10 to pass therethrough. The temperature control pipe 304 branches from a water supply pipe 302 connected to a water source such as a water supply, and guides low temperature water (city water) to the tap temperature control valve 41. The hot-water temperature adjustment valve 41 adjusts the temperature by mixing high-temperature water led out from the upper part of the tank 10 through the high-temperature lead-out pipe 303 and low-temperature water supplied through the temperature control pipe 304. The hot water whose temperature is adjusted by the hot water tap temperature control valve 41 passes through the hot water pipe piping 305 and is discharged from a hot water tap (not shown) such as a faucet or a shower, or is filled in the bathtub 6. The bathtub 6 stores hot water at around 40 ° C. for bathing.

  The reheating heat exchanger 5 heats the bathtub water by exchanging heat between the hot water led out from the upper part of the tank 10 and the bathtub water circulating from the bathtub 6. The bathtub return pipe 306 b tracks the bathtub water in the bathtub 6 and guides it to the heat exchanger 5. The bathtub going-out pipe 306 a guides the bathtub water heated by the reheating heat exchanger 5 to the bathtub 6. The follow-up piping 307 a guides the high-temperature water in the upper part of the tank 10 to the follow-up heat exchanger 5. The reheating return pipe 307 b guides the hot water whose temperature has decreased by exchanging heat with the bathtub water from the bathtub 6 in the reheating heat exchanger 5 to the tank 10.

  The boiling pump 31 is connected in the middle of the boiling forward piping 301a. The tracking pump 32 is connected in the middle of the tracking return pipe 307b. The bathtub pump 33 is connected in the middle of the bathtub return pipe 306b.

  The tank 10 is provided with hot water storage temperature sensors 501a to 501f at intervals in the height direction. In the illustrated configuration, the number of hot water storage temperature sensors 501a to 501f is six. However, the number is not limited to this, and is sufficient to measure the temperature distribution inside the tank 10 with higher accuracy. A number of temperature sensors may be provided. The boiling return pipe 301b is provided with a boiling temperature sensor 502 that detects the temperature of the boiled high-temperature water on the downstream side of the heating means 20. The feed water pipe 302 is provided with a feed water temperature sensor 504 for detecting the feed water temperature. A derived temperature sensor 503 that detects the temperature of the high-temperature water derived from the tank 10 is provided in the upper part of the tank 10. The tap pipe 305 is provided with a tap temperature sensor 505 that detects the temperature of the hot water supplied to the tap. The bathtub return pipe 306b is provided with a bathtub return temperature sensor 506 that detects a bathtub return temperature flowing from the bathtub 6 into the reheating heat exchanger 5. In addition, you may utilize this bathtub return temperature sensor 506 as a means to detect bathtub temperature by operating the bathtub pump 33 regularly. The tracking return pipe 307b is provided with a tracking return temperature sensor 507 for detecting the temperature of the hot water returning from the tracking heat exchanger 5 to the tank 10 (tracking return temperature). The reheating temperature may be estimated from the number of rotations of the reheating pump 32, the number of rotations of the bathtub pump 33, the high temperature water derivation temperature, the bathtub return temperature, and the like, instead of being detected by a sensor. The tap pipe 305 is provided with a tap flow sensor 601 for detecting the amount of hot water used on the demand end side.

  The individual control means 100 controls the operation of the heating means 20, the boiling pump 31, the reheating pump 32, the bathtub pump 33, the hot water tap temperature adjustment valve 41, etc., based on the information detected by each sensor described above. Thus, the operation of the hot water storage type water heater 8 is controlled. The individual control means 100 calculates a hot water tap load, a reheating load, a hot water storage state in the tank 10 and the like based on information detected by the above-described sensor. Further, the individual control means 100 stores household information such as the number of persons in the household, information on the size (capacity) of the bathtub 6, and the like.

  As shown in FIG. 1, the centralized controller 7 is connected to the individual control means 100 of the hot water storage hot water heater 8 of each household so as to communicate with each other. The centralized controller 7 acquires information such as the tap load, reheating load, hot water storage state, household information, and bathtub size of each household through communication with the individual control means 100 of the hot water storage hot water heater 8 of each household. The centralized controller 7 controls the operation of the hot water storage hot water heater 8 of each household by instructing specific control information to the individual control means 100 of the hot water storage hot water heater 8 of each household.

  FIG. 3 is a block diagram showing a signal flow in hot water storage type hot water heater 8 according to Embodiment 1 of the present invention. As shown in FIG. 3, the individual control means 100 includes a heat storage amount calculation means 101, a required heat amount prediction means 104, a boiling control means 105, a valve control means 106, a target temperature setting means 107, a pump control means 108, a boiling mode. A setting unit 109, a load setting unit 110, and the like are included.

  The individual control means 100 includes a time detection means (timer) 200, hot water storage temperature sensors 501a to 501f, a boiling temperature sensor 502, a derived temperature sensor 503, a feed water temperature sensor 504, a tap temperature sensor 505, a bathtub return temperature sensor 506, Information from the tracking return temperature sensor 507 and the tap flow sensor 601 is input. The individual control unit 100 controls the heating unit 20, the boiling pump 31, the reheating pump 32, the bathtub pump 33, the hot-water tap temperature adjustment valve 41, and the like based on the input information.

  The target temperature setting means 107 is based on an instruction received from a user via a user interface device (not shown) such as a remote controller, etc., and the temperature of hot water supplied to the shower or the bathtub 6 by releasing from the hot water tap, Or, set the target temperature for tracking.

  The load setting means 110 is based on an instruction received from the user via a user interface device (not shown), and the amount of hot water to the bathtub 6, the number of bathers, the hot water time, the bathing time zone, the bath warming time zone, and A method for controlling the temperature of the bathtub 6 is set. Here, the temperature control method of the bathtub 6 includes, for example, an automatic heat retention mode for maintaining the bathtub temperature within a predetermined range, a batch reheating mode for collectively raising the bathtub temperature cooled to a medium to low temperature to the target temperature, It is set in a form that is selected from a plurality of modes such as a quick chasing mode that gives priority to chasing ability, which is disadvantageous for hot water avoidance and energy saving.

  The heat storage amount calculating means 101 calculates the heat storage amount effective for the hot water tap load among the heat storage amounts of the hot water in the tank 10 based on the information of the hot water storage temperature sensors 501a to 501f. For example, in the hot water tap load, the heat energy of the hot water in the tank 10 is given to the low-temperature water by mixing, so that it is obtained by integrating the tank volume with the reference temperature of the heat energy as the feed water temperature. Here, the calculation may be performed by integrating only the hot water region having a predetermined temperature (for example, 45 ° C.) or higher.

  Further, the heat storage amount calculation means 101 retraces the heat storage amount of the hot water in the tank 10 based on the information of the hot water temperature sensors 501a to 501f and the target temperature set by the target temperature setting means 107. Calculate the effective heat storage amount. For example, in the reheating, the high temperature water led to the reheating heat exchanger 5 through the retreating piping 307a supplies heat to the bath water in the reheating heat exchanger 5 so that the temperature is lowered and the reheating return piping. It returns to the tank 10 from 307b. Therefore, of the thermal energy of the hot water in the tank 10, the thermal energy that is effectively used for reheating is a portion obtained by subtracting the reheating temperature from the hot water storage temperature. That is, a heat storage amount effective for tracking is obtained by integrating the tank return volume from the tracking heat exchanger 5 to the tank 10 with respect to the tank volume. Here, the return return temperature may be predicted based on information from the target temperature setting means 107 and information on the bathtub return temperature sensor 506. For example, assuming that the bath temperature is constant at the target bath temperature, a predetermined temperature difference depending on the performance of the additional heat exchanger 5 may be added thereto to predict the additional return temperature. In addition, assuming that the bath temperature is constant at the average value of the current bath temperature and the target bath temperature, the reheating temperature is predicted by adding a predetermined temperature difference depending on the performance of the reheating heat exchanger 5. Also good.

  The necessary heat amount predicting means 104 predicts the heat storage amount necessary for avoiding running out of hot water with respect to the hot water tap load based on the past results of the hot water tap load of the user or a predetermined design value. For example, when based on past user tap load results, the required heat amount prediction unit 104 generates the tap load generated based on information from the time detection unit 200, the tap temperature sensor 505, and the tap flow rate sensor 601. By recording the size of the water and the time zone in which it occurs every day, a faucet load pattern, which is a pattern in which a faucet load is generated, is learned. The required heat quantity predicting means 104 predicts the necessary heat quantity at which hot water does not run in consideration of simultaneously performing a boiling operation with a predetermined heating capacity for the learned tap load pattern. Here, the required amount of heat can be obtained by subtracting the amount of heat that can be heated at the time interval from the total load at the predetermined time interval. Further, when the required heat amount is calculated for all cases that can be set as the start time and end time of a predetermined time interval, and the required heat amount is determined using the maximum value, the most reliable required heat amount is obtained. In addition, when determining the required heat quantity based on a predetermined design value, for example, the required heat quantity is designed to be large in a time zone (for example, from 17:00 to 23:00) in which a large amount of tap load is generally predicted. There is a method of designing the required heat amount small during the time period. For example, when designing a large required heat amount, it is set to 300 L in terms of 42 ° C., and when designing a small necessary heat amount, it is set to 50 L in terms of 42 ° C.

  Furthermore, the necessary heat amount predicting means 104 predicts the heat storage amount necessary for reheating based on the past information of the reheating load of the user, the current temperature of the bathtub 6 and the state of the hot water amount, or both. . The additional load is the amount of heat necessary to raise the temperature of the bathtub 6 from the current temperature to the target bathtub temperature. The hot water volume (for example, 200 L) of the bathtub 6 is set to the target bathtub temperature (for example, 40 ° C.) and the current bathtub temperature. It is calculated by multiplying the difference from the temperature (for example, 30 ° C.), and further multiplying the density of the water (for example, 1 kg / L) and the specific heat (for example, 1 kcal / g ° C.). Here, for the amount of hot water in the bathtub 6, for example, a general value (for example, 200 L) may be used, or a value set by the user may be used. Further, in the case where the hot water is directly discharged from the tank 10 to the bathtub 6, a flow meter may be installed in the discharge path, and the integrated value of the flow rate may be regarded as the hot water amount of the bathtub 6. In this configuration, for example, a water level detecting means such as a pressure sensor is provided in the bathtub return pipe 306b, and when the hot water is directly discharged from the tank 10 to the bathtub 6, the correlation between the integrated flow rate and the water level is initially learned. On the contrary, after that, the amount of hot water in the bathtub 6 estimated from the water level may be used. Further, in the case of having a function of learning and storing a past chasing load, the chasing load of the day may be predicted in the form of a maximum value or an average value of the learning results in a past predetermined period. Here, the learning of the reheating load may be learned based on a value calculated from the amount of hot water in the bathtub 6 and the temperature difference between the start and end of the reheating operation, or the bathtub return pipe 306b or The flow rate circulating through the bathtub outlet pipe 306a is directly detected by a flow meter, or indirectly calculated from the control signal to the bathtub pump 33, and the temperature at the entrance and exit of the bathtub water of the reheating heat exchanger 5 You may learn based on the value calculated from a difference. Further, in the prediction of the heat storage amount necessary for reheating, the reheating load itself may be used as the necessary heat storage amount, or a value obtained by subtracting the amount of heat that can be heated by the heating means 20 during the reheating operation is required. It is also good.

  The necessary heat amount predicting means 104 predicts the heat storage amount necessary to avoid running out of hot water with respect to the tap load and the heat storage amount necessary for reheating as described above, and sums both. It is possible to predict the amount of heat storage that should be secured at the present time so as not to run out of hot water with respect to the daily load pattern.

  The boiling-up control unit 105 sets a predetermined ratio in the daily load for a predetermined time so that the heat storage amount in the tank 10 is not insufficient with respect to the necessary heat storage amount predicted by the necessary heat amount prediction unit 104. The boiling operation is controlled by controlling the start-up, operation state, stop, and the like of the heating means 20 so as to boil up the belt.

  Based on the target temperature set by the target temperature setting means 107, the valve control means 106 controls the operation of the tap temperature control valve 41 so that the hot water flowing out from the tap temperature control valve 41 approaches the target temperature.

  The pump control means 108 controls the number of rotations of the boiling pump 31, the reheating pump 32, and the bathtub pump 33, and adjusts the pump circulation amount.

  The boiling mode setting means 109 controls the hot water storage hot water heater 8 as a whole with priority on energy saving or priority on avoiding hot water based on an instruction received from the user via a user interface device (not shown), And so on.

  The device configuration in the first embodiment has been described above. Next, the operation of the hot water storage type water heater 8 in the first embodiment will be further described.

≪Basic driving operation≫
First, the basic operation of each hot water storage type hot water heater 8 will be described.

[Boiling operation]
Low temperature water is injected from the lower part of the tank 10 through the water supply pipe 302 and stored. The low-temperature water collected from the lower part of the tank 10 is drawn into the boiling forward piping 301 a by the boiling pump 31 and led to the heating means 20. The heating means 20 heats the led low-temperature water to boil it into high-temperature water. The boiled high-temperature water flows from the upper part of the tank 10 through the boil-up return pipe 301b and is stored.

[Hot water tap operation]
The high-temperature water collected from the upper part of the tank 10 flows out of the high-temperature outlet pipe 303 and is led to the hot-water tap temperature control valve 41 in accordance with a demand on the demand end side where hot water is used. The tap temperature control valve 41 guides low-temperature water through a temperature control pipe 304 branched from the water supply pipe 302, mixes it with high-temperature water introduced from the tank 10, and uses a faucet, a shower, or a bathtub 6 through the tap pipe 305. Supply to the demand end.

[Remembrance driving]
The hot water stored in the tank 10 is automatically forced by the user's operation or automatically when the bath temperature detected periodically by the bath return temperature sensor 506 becomes lower than the target temperature by a predetermined amount or more. In order to raise the bathtub temperature by the chasing operation, the chasing heat pipe 5 is led to the chasing heat exchanger 5 through the chasing pipe 307a. At substantially the same time as this, the bathtub water stored in the bathtub 6 is guided to the reheating heat exchanger 5 through the bathtub return pipe 306b. The hot water from the tank 10 whose temperature is lowered by applying heat to the bathtub water in the reheating heat exchanger 5 returns to the tank 10 through the reheating return pipe 307b. Moreover, the bathtub water that has received heat at the reheating heat exchanger 5 and has risen in temperature returns to the bathtub 6 through the bathtub outlet pipe 306a. Next, the chasing operation is automatically terminated by the user's operation or automatically when the bathtub temperature detected by the bathtub return temperature sensor 506 exceeds the target temperature by a predetermined amount or more.

≪General boiling operation≫
Next, the boiling operation generally performed in each hot water storage type hot water heater 8 will be described.
[Midnight boiling operation]
Each hot water storage type hot water heater 8 provided in the hot water storage type hot water supply system 1 is heated at midnight time to utilize an inexpensive electricity charge in the late night time period or to respond to a load generated after getting up in each household. I do. FIG. 4 is a diagram for explaining the outline of the heating operation in the midnight time zone. The boiling operation during midnight hours may be performed so that the entire amount of the assumed daily load is stored, or about 80% of the daily load is stored considering the balance with energy saving. For example, the entire amount of the tank 10 may be boiled to a lower temperature such as 65 ° C. to 70 ° C. Alternatively, in the case of a contract in which the electricity rate is uniform throughout the day, energy saving may be given the highest priority and the minimum heat storage amount that can avoid hot water shortage may be used.

[Additional boiling operation]
If the entire amount of the assumed daily load is not stored in the boiling operation at midnight, an additional boiling operation may be required to avoid running out of hot water for a concentrated load. As the additional boiling operation, there is a method of starting the boiling operation when the current heat storage amount is lower than the necessary heat storage amount predicted by the required heat amount prediction unit 104. Alternatively, there is also a method of predicting the amount and timing of the load, taking into consideration the heating capability of the heating means 20, and starting the boiling operation at a timing without running out of hot water.

[Minimum heat storage amount boiling operation]
After heat storage sufficient for the daily load by midnight boiling operation and additional boiling operation, ideally, no hot water runs out even if the boiling operation is not performed. However, in order to cope with the load fluctuation of the user beyond the assumption, the boiling operation is performed so as to maintain the minimum heat storage amount (for example, the heat storage amount corresponding to 50 L in terms of 42 ° C.). For example, there is an operation method in which the boiling operation is started when the heat storage amount is equal to or less than the minimum heat storage amount, and the boiling operation is terminated when the heat storage amount is recovered to the minimum heat storage amount or more.

<< Characteristic Operation of First Embodiment >>
The characteristic operation of the first embodiment will be described below. The hot water storage hot water supply system 1 according to the first embodiment includes the hot water storage hot water heaters 8 installed in each household of an apartment house with the number of households Nall, that is, the hot water storage hot water heaters 8 of all the numbers Nall. In the first embodiment, for example, a time zone in which loads are concentrated in the hot water storage hot water heater 8 is set in advance as a concentrated load time zone, such as a time zone in which bathing is performed. In the following description, it is assumed that 17:00 to 23:00 is set as the concentrated load time zone. For such a hot water storage hot water supply system 1 according to the first embodiment, the total power consumed by all the number of hot water storage hot water heaters 8 in the concentrated load time zone is less than or equal to a preset allowable total power Wub. It is required to be suppressed. The hot water storage type hot water supply system 1 according to the first embodiment avoids hot water shortage and suppresses total power in a time zone where many hot water storage type hot water heaters 8 that perform additional boiling operation for recovering the heat storage amount that decreases during bathing tend to concentrate. It aims at improving the energy saving of the whole hot water storage type hot-water supply system 1 under the constraint conditions which implement | achieve simultaneously.

[Pre-boiling operation during concentrated load time]
The centralized controller 7 obtains the number Nub of hot water storage type hot water heaters 8 capable of simultaneously performing the boiling operation during the concentrated load time period. This number Nub is referred to as “allowable simultaneous operation number Nub”. The allowable simultaneous operation number Nub is obtained, for example, by dividing the allowable total power Wub by the average power consumption Wi value per 8 hot water storage hot water heaters 8. As for the average power consumption Wi value, information on each hot water storage type hot water heater 8 may be manually input to the centralized controller 7 by a specialist in advance, or the centralized controller 7 may input information about each hot water storage type hot water heater 8. You may acquire by communicating with the separate control means 100. FIG. Alternatively, a control command may be issued from the centralized controller 7 to the individual control means 100 of each hot water storage type hot water heater 8 so that the power consumption becomes Wi. Moreover, in the estimation of the power consumption Wi of each hot water storage type hot water heater 8, values in typical rated conditions may be used, the outdoor temperature of the day, the hot water temperature, the hot water storage state of the tank 10, the boiling by the heating means 20. You may estimate based on raising temperature etc.

  The centralized controller 7 calculates the corrected allowable simultaneous operation number Kub · Nub by multiplying the allowable simultaneous operation number Nub by a predetermined correction coefficient Kub. Here, the correction coefficient Kub may be set to a value smaller than 1 in order to make the total power in the concentrated load time zone more surely equal to or less than the allowable total power Wub, or each hot water storage type water heater 8 in the concentrated load time zone. However, it may be set to a value larger than 1 in consideration of a possibility that the timing of performing the additional boiling operation is shifted. The corrected allowable simultaneous operation number Kub · Nub is further rounded off or rounded off to a natural number. In the following description, the value of the corrected allowable simultaneous operation number Kub / Nub, which is thus made a natural number, is simply referred to as the allowable simultaneous operation number Kub / Nub. The total number Nall> the allowable simultaneous operation number Kub · Nub> 1.

  In the first embodiment, out of the total number Nall of the hot water storage water heaters 8, the allowable hot water storage water heaters 8 of the allowable simultaneous operation number Kub / Nub are allowed to perform the additional boiling operation during the concentrated load time zone. . On the other hand, with respect to the remaining number (Nall-Kub / Nub) of hot water storage type hot water heaters 8, the additional boiling operation is not performed during the concentrated load time zone by performing the pre-boiling operation during the concentrated load time zone described later. To suppress.

  A method for selecting the hot water storage type hot water heater 8 of the allowable simultaneous operation number Kub / Nub that allows the additional boiling operation during the concentrated load time period from the total number Nall of the hot water storage type hot water heaters 8 will be described below. In the hot water storage hot water supply system 1, for each hot water storage hot water heater 8, the degree of difficulty in securing in the tank 10 a heat storage amount that covers the load generated during the concentrated load time zone is evaluated. This difficulty level is hereinafter referred to as “concentrated load heat storage difficulty level”. In the first embodiment, a numerical value indicating the ease of concentrated load heat storage is calculated as an index (evaluation function) for evaluating the concentrated load heat storage difficulty level. The larger the concentrated load heat storage ease value, the lower the concentrated load heat storage difficulty level, that is, the easier it is to store in the tank 10 the amount of heat stored to cover the load generated in the concentrated load time zone. Conversely, the smaller the value of the concentrated load heat storage ease, the higher the concentrated load heat storage difficulty level, that is, it is not easy to store the heat storage amount that covers the load generated in the concentrated load time zone in the tank 10. To do.

  The centralized controller 7 calculates the value of the centralized load heat storage ease for each hot water storage type hot water heater 8 based on the information acquired by communication with the individual control means 100 of each hot water storage type hot water heater 8. Compare the values of the concentrated load heat storage ease. Then, the centralized controller 7 selects the same number of hot water storage type hot water heaters 8 as the allowable simultaneous operation number Kub / Nub in order from the lowest centralized load heat storage value. The same number of hot water storage hot water heaters 8 as the selected allowable simultaneous operation number Kub · Nub are referred to as a concentrated load heat storage difficult machine. The same number of hot water storage type hot water heaters 8 as the allowable simultaneous operation number Kub / Nub selected as the concentrated load heat storage difficult machine corresponds to a group having a high concentrated load heat storage difficulty level. Of all the Nall hot water storage hot water heaters 8, the number of hot water storage water heaters 8 (Nall-Kub · Nub) not selected as the central load heat storage difficult machine is called a central load heat storage easy machine. The number (Nall-Kub · Nub) of hot water storage type water heaters 8 corresponds to a group having a low degree of concentrated load heat storage difficulty.

  The centralized controller 7 performs a pre-boiling operation in a centralized load time period, which is a boiling operation performed before the centralized load time period, with respect to the individual control means 100 of the hot water storage type water heater 8 that is a centralized load heat storage device. To issue a command. FIG. 5 is a diagram for explaining the outline of the additional boiling operation and the concentrated load time period preliminary boiling operation. The upper part of FIG. 5 shows changes in the hot water storage state of the hot water storage type water heater 8 that is considered to be a concentrated load heat storage difficult machine, and the lower part of FIG. 8 shows changes in hot water storage status for one day. As shown in FIG. 5, in the hot water storage type water heater 8 which is a concentrated load heat storage device, the boiling control means 105 is generated in the concentrated load time zone based on the load pattern learned by the necessary heat quantity prediction means 104. Control is performed so as to perform the pre-boiling operation in the concentrated load time period so as to ensure the amount of heat storage for the predicted load in the tank 10 by the start of the concentrated load time period.

  In the hot water storage type water heater 8 that is regarded as a central load heat storage device, a load expected to be generated in the central load time zone prior to the start of the central load time zone by performing a pre-boiling operation in the central load time zone. The amount of stored heat that covers the condition is secured in the tank 10 in advance. For this reason, in the hot water storage type water heater 8 that is regarded as a central load heat storage device, it is possible to reliably suppress the need for additional boiling operation during the concentrated load time zone, and therefore additional boiling during the concentrated load time zone. Carrying out driving is avoided. Therefore, only the hot water storage type water heater 8 that is considered to be a concentrated load heat storage difficult machine performs the additional boiling operation during the concentrated load time zone. Therefore, the number of the hot water storage type hot water heaters 8 that perform the additional boiling operation in the concentrated load time zone is suppressed to the allowable simultaneous operation number Kub / Nub that is the number of the concentrated load heat storage difficult machines. As a result, the total power consumed by the hot water storage hot water supply system 1 during the concentrated load time period can be reliably suppressed within the allowable total power Wub.

  In addition, in the plurality of hot water storage hot water heaters 8 that are regarded as the concentrated load heat storage devices, the order of performing the pre-boiling operation in the concentrated load time zone can be freely determined, but the concentrated load time in order from the smaller heat storage amount. It is preferable to carry out the band pre-boiling operation. Thereby, since there is a high possibility of lowering the temperature of water entering the heating means 20, the energy saving performance of the entire hot water storage hot water supply system 1 is improved.

  On the other hand, in the hot water storage type hot water heater 8 that is regarded as a concentrated load heat storage difficult machine, the pre-boiling operation in the concentrated load time zone is not performed. As shown in FIG. 5, in the hot water storage type water heater 8 that is considered to be a concentrated load heat storage difficult machine, the heat storage amount at the start of the concentrated load time zone is compared with the heat storage amount that covers the load expected to occur in the concentrated load time zone. And low. However, in the hot water storage type water heater 8 that is regarded as a concentrated load heat storage difficult machine, it is possible to reliably avoid running out of hot water by performing the additional boiling operation during the concentrated load time period. The hot water storage type hot water heater 8 that is regarded as a concentrated load heat storage difficult machine has a larger load in the concentrated load time zone than the hot water storage type hot water heater 8 that is regarded as a concentrated load heat storage easy machine. According to the first embodiment, in such a hot water storage type hot water heater 8 (a machine with difficulty in concentrated load heat storage) having a large load in the concentrated load time zone, the amount of heat stored at the start of the concentrated load time zone is reduced. Holding a large amount of heat storage in the tank 10 for a long time before the start of the time zone is suppressed. For this reason, the heat dissipation loss from the tank 10 can be suppressed, and the energy saving performance as the hot water storage type hot water supply system 1 as a whole can be improved.

  Next, a method for calculating the concentrated load heat storage ease value will be described. The centralized controller 7 calculates the value of the centralized load heat storage ease by using one of the following methods (1) to (5) or by combining two or more methods.

  (1) The individual control means 100 learns the actual value of the concentrated load, which is the sum of the tap load and the renewal load generated during the concentrated load time period in the past predetermined period (for example, two weeks). Here, the actual value of the concentrated load to be learned is, for example, an average value, a maximum value, an average + standard deviation in the past predetermined period, and any of these may be used. The centralized controller 7 acquires from the individual control means 100 of each hot water storage type hot water heater 8 the actual value of the concentrated load learned by the hot water storage type hot water heater 8 through communication. When the centralized controller 7 calculates the value of the concentrated load heat storage ease of each hot water storage type hot water heater 8, the larger the actual value of the learned concentrated load of the hot water storage type hot water heater 8 is, the easier the concentrated load heat storage is. To reduce the value of. For example, by preparing in advance a correction coefficient that decreases as the actual value of the concentrated load increases, multiplying the reference value of the concentrated load heat storage ease before correction by the correction coefficient, the concentrated load heat storage ease The value of is calculated. In the above case, the greater the concentrated load actual value, the higher the concentrated load heat storage difficulty level.

  (2) The centralized controller 7 acquires the value of the capacity of the tank 10 of the hot water storage type hot water heater 8 from the individual control means 100 of each hot water storage type hot water heater 8 by communication. When the centralized controller 7 calculates the value of the concentrated load heat storage ease of each hot water storage type hot water heater 8, the smaller the value of the capacity of the tank 10 of the hot water storage type hot water heater 8, the greater the value of the concentrated load heat storage capacity. To reduce For example, a correction coefficient that becomes smaller as the capacity value of the tank 10 becomes smaller is prepared in advance, and by multiplying the reference value of the concentrated load heat storage ease before correction by the correction coefficient, the concentrated load heat storage is easy. Calculate the sex value. In the above case, the smaller the capacity value of the tank 10, the higher the concentrated load heat storage difficulty level is evaluated.

  Further, when the methods (1) and (2) are combined, the value of the concentrated load heat storage ease may be calculated as follows. The centralized controller 7 divides the learned actual load value of the stored hot water heater 8 by the capacity value of the tank 10 when calculating the concentrated load heat storage ease value of each hot water heater 8. It calculates so that the value of concentrated load heat storage ease may fall, so that a value is large. For example, a correction coefficient that decreases as the value obtained by dividing the actual value of the concentrated load by the capacity value of the tank 10 is prepared in advance, and the correction coefficient is used as the reference value of the concentrated load heat storage ease before correction. Is multiplied to calculate the concentrated load heat storage ease value.

  (3) The centralized controller 7 acquires the number of households using the hot water storage type hot water heater 8 from the individual control means 100 of each hot water storage type hot water heater 8 by communication. When the centralized controller 7 calculates the value of the concentrated load heat storage ease of each hot water storage type hot water heater 8, the centralized controller 7 calculates the value of the concentrated load heat storage ease as the number of households using the hot water storage type hot water heater 8 increases. Calculate to decrease. For example, by preparing in advance a correction coefficient that becomes a smaller value as the number of households using the hot water storage type hot water heater 8 increases, multiply the reference value of the concentrated load heat storage ease before correction by the correction coefficient. Then, the value of the concentrated load heat storage ease is calculated. In the above case, the larger the number of households, the higher the concentrated load heat storage difficulty level.

  (4) The centralized controller 7 acquires the size (capacity) of the bathtub 6 of the household using the hot water storage type hot water heater 8 from the individual control means 100 of each hot water type hot water heater 8 by communication. When the centralized controller 7 calculates the value of the concentrated load heat storage ease of each hot water storage type hot water heater 8, the larger the size (capacity) of the bathtub 6 of the household using the hot water storage type hot water heater 8, the higher the concentrated load. It calculates so that the value of heat storage ease may be reduced. For example, a correction coefficient that decreases as the size (capacity) of the bathtub 6 increases in advance, and the concentrated load heat storage is obtained by multiplying the reference value of the concentrated load heat storage ease before correction by the correction coefficient. Calculate the ease value. In the above case, the larger the size (capacity) of the bathtub 6, the higher the concentrated load heat storage difficulty level.

  Further, when the methods (3) and (4) are combined, the concentrated load heat storage ease value may be calculated as follows. The centralized controller 7 calculates the value of (the capacity of the bathtub 6 + the number of bathers × the shower 80L / person) for each household. The number of bathers shall be equal to the number of households. Here, the shower usage per person is 80L. Or, further considering the automatic heat retention time Hr for maintaining the bath temperature, the value of (capacity of bath 6 + number of bathers × shower 80L / person + Hr × tub heat dissipation per unit time) is calculated for each household. When the centralized controller 7 calculates the value of the centralized load heat storage ease of each hot water storage type hot water heater 8, the above-mentioned (capacity of bathtub 6 + number of bathers × 80L / person of shower) or (capacity of bathtub 6 + number of bathers) It is calculated so that the value of the concentrated load heat storage ease decreases as the value of x shower 80L / person + Hr x bathtub heat dissipation per unit time increases.

  (5) The hot water storage type water heater 8 is configured such that the user can select one of a plurality of boiling control modes having different heat storage amounts. For example, as the boiling-up control mode, a “less” mode, a “more” mode, and a “full tank maintenance” mode are prepared in ascending order of the heat storage amount, and the user selects one of them. The centralized controller 7 acquires information about which boiling-up control mode is selected from the individual control means 100 of each hot water storage type hot water heater 8 by communication. When the central controller 7 calculates the value of the concentrated load heat storage ease of each hot water storage type hot water heater 8, if the heating control mode for increasing the heat storage amount is selected, the heat storage amount is decreased. It calculates so that the value of concentrated load heat storage ease may be reduced compared with the case where the heating control mode to be selected is selected. For example, when the centralized controller 7 calculates the centralized load heat storage ease value based on the learned actual value of the concentrated load, it is plus 0 L in the “less” mode, and in the “more” mode. In the case of the plus 100 L, in the “full tank maintenance” mode, plus 200 L is added to the actual value of the concentrated load to perform the calculation. In the above case, when the heating control mode for increasing the heat storage amount is selected, the concentrated load heat storage difficulty level is evaluated higher than when the heating control mode for decreasing the heat storage amount is selected. It corresponds to that. Further, the hot water storage type water heater 8 for which the “full tank maintenance” mode is selected may be selected as a concentrated load heat storage difficult machine.

  Each hot water storage is calculated by calculating the value of the concentrated load heat storage ease of each hot water storage type hot water heater 8 by one of the methods (1) to (5) described above or by combining two or more methods. The concentrated load heat storage difficulty level of the water heater 8 can be accurately evaluated.

≪Action ・ Effect≫
As described above, according to the first embodiment, in a facility such as an apartment house where a plurality of hot water storage hot water heaters 8 are installed, hot water is avoided in each hot water storage hot water heater 8 during a concentrated load period. However, the total power consumed by the entire hot water storage type hot water heater 8 can be reliably suppressed. Moreover, the hot water storage type hot water supply machine 8 of the household with a heavy load of the concentrated load time zone is selected as the concentrated load heat storage difficulty machine among the entire hot water storage type hot water supply machine 8 and the boiling operation in the concentrated load time zone is allowed. For this reason, in the hot water storage type water heater 8 selected as a concentrated load heat storage difficult machine having a large load in the concentrated load time zone, a large amount of heat storage corresponding to the load in the concentrated load time zone is stored in the tank before the concentrated load time zone. It is not necessary to secure 10. Therefore, it is possible to reduce the heat dissipation loss from the tank 10 and to lower the boiling temperature by the heating means 20, so that the energy saving of the hot water storage type hot water supply system 1 as a whole can be improved.

  In the first embodiment, the concentrated controller 7 calculates the value of the concentrated load heat storage ease of each hot water storage type hot water heater 8 (that is, evaluates the concentrated load heat storage difficulty level), but is not limited to such a configuration. The individual control means 100 of each hot water storage type water heater 8 calculates its own concentrated load heat storage ease value (that is, evaluates the concentrated load heat storage difficulty level), and the centralized controller 7 obtains the information by communication. And may be configured to be compared.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. 6. The description will focus on the differences from the first embodiment described above, and a description of the same matters will be omitted. The hardware configuration of the hot water storage type hot water supply system 1 according to the second embodiment of the present invention is the same as the configuration of the first embodiment shown in FIGS. FIG. 6 is a diagram for explaining the outline of the additional boiling operation in the hot water storage type hot water heater provided in the hot water storage type hot water supply system 1 of the second embodiment.

  In the second embodiment, as a method of suppressing the total power of the hot water storage hot water supply system 1 in the concentrated load time zone, the number of hot water storage hot water heaters 8 that simultaneously perform boiling operation during the concentrated load time zone is limited. Instead, the power consumption or heating capacity of each hot water storage type hot water heater 8 is limited. In the following description, the centralized controller 7 instructs the individual control means 100 of each hot water storage type hot water heater 8 about the value of the power consumption per unit when the hot water type hot water heater 8 performs the boiling operation during the concentrated load time period. It shall be. Here, the power consumption of the hot water storage type hot water heater 8 is approximately proportional to the heating capacity of the heating means 20. For this reason, the centralized controller 7 instructs the individual control means 100 of each hot water storage type hot water heater 8 to determine the value of the heating capacity per unit when the hot water type hot water heater 8 performs the boiling operation during the central load period. Thus, the power consumption of the hot water storage type water heater 8 may be controlled.

  In the hot water storage type hot water supply system 1 according to the second embodiment, the centralized controller 7 assumes the number Nhp of the hot water storage type hot water heaters 8 that simultaneously perform the boiling operation in the concentrated load time zone. This number Nhp is referred to as “assumed simultaneous operation number Nhp”. The assumed simultaneous operation number Nhp may be equal to the total number Nall of the hot water storage hot water heaters 8 or is smaller than 1 in consideration of the possibility of the timing of the heating operation of the plurality of hot water storage hot water heaters 8 being shifted. The predetermined ratio Khp may be determined based on the value obtained by multiplying the total number Nall.

  The centralized controller 7 obtains the permissible power Wlm per unit so that the total power does not exceed the permissible total power Wub even when the hot water storage hot water heaters 8 having the assumed simultaneous operation number Nhp simultaneously perform the boiling operation. Here, the permissible power Wlm per vehicle can be obtained by dividing the permissible total power Wub by the assumed simultaneous operation number Nhp. The centralized controller 7 restricts the power consumption when each hot water storage type hot water heater 8 performs a boiling operation during the centralized load time zone, so that the individual control means 100 of each hot water storage type hot water heater 8 has a concentrated load time zone. The permissible power Wlm per unit is indicated. Based on this instruction, the individual control unit 100 controls the operation of the heating unit 20 so that the heating power is within a range in which the power consumption is less than or equal to the allowable power Wlm when the boiling operation is performed in the concentrated load time period. .

  According to the hot water storage type hot water supply system 1 of the second embodiment, the power consumption or the heating capacity when each hot water storage type hot water heater 8 performs the boiling operation during the concentrated load time period is limited as described above. As a result, even when the hot water storage type hot water heaters 8 of the assumed simultaneous operation number Nhp perform the boiling operation simultaneously during the concentrated load time period, the electric power consumed by the entire hot water storage type hot water supply system 1 is reduced to the allowable total electric power Wub or less. It can be surely suppressed.

  Further, in the hot water storage type hot water supply system 1 according to the second embodiment, each hot water storage type hot water heater 8 operates as follows so as to avoid running out of hot water when the power consumption is limited to the allowable power Wlm or less. To do. The centralized controller 7 calculates the allowable limited heating capacity Qlm by dividing the allowable power Wlm per unit by the average COP (Coefficient of Performance) value or the assumed minimum COP value. Then, the value of the obtained limited heating capacity Qlm is transmitted to the individual control means 100 of each hot water storage type hot water heater 8. Alternatively, the individual control means 100 of each hot water storage type hot water heater 8 may calculate the value of the limited heating capacity Qlm based on the allowable power Wlm instructed from the centralized controller 7.

  Each hot water storage type water heater 8 is allowed to perform a boiling operation with the limited heating capacity Qlm even in the concentrated load time zone. The necessary heat quantity predicting means 104 is based on the load pattern learned as described in the first embodiment, and the limited heating capacity Qlm in the concentrated load time period from the heat storage amount that covers the load predicted to be generated in the concentrated load time period. The concentrated load time prior heat storage amount, which is the heat storage amount obtained by subtracting the heat amount that can be generated by performing the boiling operation at, is calculated. If the pre-heat storage amount of the concentrated load time zone is secured in the tank 10 before the start of the concentrated load time zone, it is possible to prevent the hot water from running out with respect to the predicted load generated in the concentrated time zone. it can. Therefore, in each hot water storage type hot water supply device 8, the boiling control means 105 performs concentrated load time zone pre-boiling operation so as to ensure the concentrated heat load time zone pre-heat storage amount in the tank 10 by the start of the concentrated load time zone. Control to do. According to such control, the total power of the entire hot water storage type hot water supply system 1 in the concentrated load time zone is surely suppressed to the allowable total power Wub or less, and the heat storage amount of each hot water storage type hot water heater 8 is suppressed as much as possible. Cutting can be avoided. For this reason, the energy saving performance of the hot water storage type hot water supply system 1 as a whole can be improved.

  In the plurality of hot water storage type hot water heaters 8, the order in which the concentrated load time zone pre-boiling operation is performed can be freely determined, but the concentrated load time zone pre-boiling operation is performed in order from the smaller heat storage amount. It is preferable. Thereby, since there is a high possibility of lowering the temperature of water entering the heating means 20, the energy saving performance of the entire hot water storage hot water supply system 1 is improved.

  Each hot water storage type water heater 8 may operate as follows so as to avoid running out of hot water when the power consumption is limited to the allowable power Wlm or less. The necessary heat amount predicting means 104 replaces the normal startup heat storage amount, which is a necessary heat storage amount predicted using the value of the normal heating capability Qst, and the value of the limited heating capability Qlm instead of the value of the normal heating capability Qst. The limited start heat storage amount Llm, which is the necessary heat storage amount predicted by using the respective, is calculated. The boiling-up control means 105 reduces the amount of stored heat at normal times when the power consumption is not limited to the allowable power Wlm or less, that is, when the time until the concentrated load time period starts is a predetermined time or more. As the threshold value for starting the boiling operation, the value of the normal startup heat storage amount is used, and the boiling operation is performed with the normal heating capacity Qst. On the other hand, when the time until the concentrated load time period starts is within the predetermined time, the boiling control unit 105 sets the normal startup heat storage amount as a threshold value for starting the boiling operation when the heat storage amount decreases. And the larger value of the limited startup heat storage amount Llm, and the boiling operation is performed with the limited heating capacity Qlm. That is, when the time until the concentrated load time period starts is within the predetermined time, the boiling control means 105 has a heat storage amount that is larger than the larger of the normal startup heat storage amount and the limited startup heat storage amount Llm. When it becomes smaller, the boiling operation is started at the limited heating capacity Qlm. According to such control, the total power of the entire hot water storage type hot water supply system 1 in the concentrated load time zone is surely suppressed to the allowable total power Wub or less, and the heat storage amount of each hot water storage type hot water heater 8 is suppressed as much as possible. Cutting can be avoided. For this reason, the energy saving performance of the hot water storage type hot water supply system 1 as a whole can be improved.

  Each hot water storage type water heater 8 may operate as follows so as to avoid running out of hot water when the power consumption is limited to the allowable power Wlm or less. The boiling control means 105 performs the boiling operation so that the heat storage amount becomes equal to or greater than the above-mentioned limited activation heat storage amount Llm by the start of the concentrated load time period. And after the start of the concentrated load time zone, the boiling control means 105 starts the boiling operation with the limited heating capacity Qlm when the heat storage amount becomes smaller than the limited activation heat storage amount Llm. According to such control, the total power of the entire hot water storage type hot water supply system 1 in the concentrated load time zone is surely suppressed to the allowable total power Wub or less, and the heat storage amount of each hot water storage type hot water heater 8 is suppressed as much as possible. Cutting can be avoided. For this reason, the energy saving performance of the hot water storage type hot water supply system 1 as a whole can be improved.

  In the hot water storage type hot water supply system 1 according to the second embodiment, the centralized controller 7 has a smaller number of hot water storage type hot water heaters 8 that are actually performing boiling operation simultaneously in the concentrated load time period than the assumed simultaneous operation number Nhp. In such a case, control may be performed so as to relax restrictions on power consumption or heating capacity for each hot water storage type hot water heater 8 as long as the total electric power of the entire hot water storage type hot water supply system 1 does not exceed the allowable total electric power Wub. Thereby, the heating capability of each hot water storage type hot water heater 8 can be raised and the boiling operation can be completed at an early stage, and the hot water resistance can be further improved.

  In addition, each hot water storage type water heater 8 has a minimum heat storage amount state in which only the minimum heat storage amount is maintained after performing heat storage sufficient for the daily load by the midnight boiling operation and the subsequent additional boiling operation. However, the centralized controller 7 collects information on whether or not each hot water storage type hot water heater 8 is in the minimum heat storage amount state, and when predicting the assumed simultaneous operation number Nhp, the number of the hot water storage type water heaters 8 in the minimum heat storage amount state. It may be predicted that the estimated simultaneous operation number Nhp decreases as the number increases, and the limited heating capacity Qlm and the like are sequentially recalculated. In this case, the limited heating capacity Qlm for the hot water storage type hot water heater 8 that is not in the minimum heat storage amount state is increased, and the limited activation heat storage amount Llm is decreased, leading to a reduction in heat dissipation. For this reason, the energy saving of the whole hot water storage type hot water supply system 1 is improved.

DESCRIPTION OF SYMBOLS 1 Hot water storage type hot water supply system, 5 Reheating heat exchanger, 6 Bathtub, 7 Centralized controller, 8 Hot water storage type hot water supply machine, 10 Tank, 20 Heating means, 31 Boiling pump, 32 Reheating pump, 33 Bathtub pump, 41 Hot water tap Temperature control valve, 100 individual control means, 101 heat storage amount calculation means, 104 required heat amount prediction means, 105 boiling control means, 106 valve control means, 107 target temperature setting means, 108 pump control means, 109 boiling mode setting means, 110 Load setting means, 200 Time detection means, 301a Boiling return piping, 301b Boiling return piping, 302 Water supply piping, 303 High temperature outlet piping, 304 Temperature control piping, 305 Hot water tap piping, 306a Bathtub piping, 306b Bathtub returning piping 307a Reciprocating piping, 307b Recirculating return piping, 501a 501f stored hot water temperature sensor, 502 boiling temperature sensor, 503 derives a temperature sensor, 504 water temperature sensor, 505 hot water faucet temperature sensor, 506 bath return temperature sensor, 507 reheating return temperature sensor, 601 hot water faucet flow sensor

Claims (4)

A plurality of hot water storage water heaters,
When performing a boiling operation at the same time during the concentrated load time period, the value of the allowable total power that is the total power allowed to be consumed by the plurality of hot water storage hot water heaters during the preset concentrated load time period Based on the assumed number of simultaneous hot water heaters, which is the number of hot water storage water heaters to be assumed, a restriction that limits power consumption or heating capacity when each of the hot water heaters performs a boiling operation during the concentrated load time period Means,
Equipped with a,
When the number of the hot water storage hot water heaters that perform the boiling operation during the concentrated load time period is smaller than the assumed simultaneous operation number, the limiting means has a total power consumption of the plurality of hot water storage water heaters. hot water storage type hot-water supply system wherein a range not exceeding the allowable total power, you alleviate the limitations of power or heating capacity of the hot water storage type water heater is performed heating operation. A plurality of hot water storage water heaters,
When performing a boiling operation at the same time during the concentrated load time period, the value of the allowable total power that is the total power allowed to be consumed by the plurality of hot water storage hot water heaters during the preset concentrated load time period Based on the assumed number of simultaneous hot water heaters, which is the number of hot water storage water heaters to be assumed, a restriction that limits power consumption or heating capacity when each of the hot water heaters performs a boiling operation during the concentrated load time period Means,
Equipped with a,
Each of the hot water storage water heaters
Means for learning a load pattern which is a pattern of a generated load size and a generated time zone;
Based on the learned load pattern and the normal heating capacity value, the normal startup heat storage amount is set as a threshold value for starting the boiling operation when the heat storage amount is reduced so that the hot water does not run out with respect to the load. A means of seeking
Based on the learned load pattern and the value of the limited heating capacity that is the heating capacity limited by the limiting means, the boiling operation is performed when the amount of stored heat is reduced so that the hot water does not run out with respect to the load. Means for obtaining a limited startup heat storage amount as a threshold for starting
When the time until the concentrated load time period starts is within a predetermined time, when the heat storage amount becomes smaller than the larger of the normal start heat storage amount and the limited start heat storage amount, the limit Control means for starting boiling operation with heating capacity;
The hot-water storage type hot-water supply system that have a. A plurality of hot water storage water heaters,
When performing a boiling operation at the same time during the concentrated load time period, the value of the allowable total power that is the total power allowed to be consumed by the plurality of hot water storage hot water heaters during the preset concentrated load time period Based on the assumed number of simultaneous hot water heaters, which is the number of hot water storage water heaters to be assumed, a restriction that limits power consumption or heating capacity when each of the hot water heaters performs a boiling operation during the concentrated load time period Means,
Equipped with a,
The plurality of hot water storage type water heaters are provided in each household,
Each said hot-water storage type water heater, hot water storage type hot-water supply system Ru comprising a heating means, and a tank for storing hot water for heating the water. Each of the hot water storage water heaters
Means for learning a load pattern which is a pattern of a generated load size and a generated time zone;
Based on the learned load pattern and the value of the limited heating capacity, which is the heating capacity limited by the limiting means, until the start of the concentrated load time period so as not to run out of hot water for the load. Means for calculating the prior heat storage amount of concentrated load time, which is the amount of heat that needs to be stored;
Control means for performing a boiling operation so as to secure the concentrated load time zone pre-heat storage amount by the start of the concentrated load time zone;
The hot water storage type hot water supply system according to any one of claims 1 to 3, wherein

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