Hot water storage system
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- NORITZ CORP
- Filing Date
- 2024-12-04
- Publication Date
- 2026-06-16
Smart Images
Figure 2026097027000001_ABST
Abstract
Description
[Technical Field]
[0001] This invention relates to a household hot water supply system that predicts future hot water usage based on past hot water usage data and stores hot water in a storage tank according to this prediction. [Background technology]
[0002] Traditionally, hot water supply systems using heat pumps as the heat source have been widely employed. These systems store heated water in a storage tank, and the stored water is then used for hot water supply. For example, some systems use inexpensive off-peak electricity to store water for the next day overnight, while others store the amount of heat needed for future hot water use, based on past hot water usage data, before the water is used.
[0003] For example, Patent Document 1 calculates the required amount of heat to heat water for the next day based on the remaining amount of hot water in the hot water storage tank, the hot water temperature, and the average temperature of the tap water, and sets the start time for hot water storage according to the time it takes to store this required amount of heat. In this case, if the required amount of heat to heat water cannot be stored during a time when electricity rates are low, either the hot water temperature or the output of the heat source unit is changed to fill the hot water storage tank with heated water.
[0004] Furthermore, Patent Document 2 calculates the required heat for heating based on the stored hot water output history and the residual heat amount in the hot water storage tank, sets the hot water storage temperature according to this required heat, and sets the heating capacity of the heat source unit according to the hot water storage temperature. If the residual heat amount is greater than the standard value, the hot water is stored at the minimum heating capacity regardless of the required heat for heating. [Prior art documents] [Patent Documents]
[0005] [Patent Document 1] Patent No. 3982416 [Patent Document 2] Patent No. 7226062 [Overview of the project] [Problems that the invention aims to solve]
[0006] The hot water storage systems described in Patent Documents 1 and 2 store hot water in a large-capacity storage tank to prevent running out of hot water. However, the heat loss from storing high-temperature hot water in this storage tank until it is dispensed is significant. Therefore, a hot water storage system is known in which a heat pump type heat source unit heats the predicted amount of heat based on past hot water dispensing times and stores it in the storage tank. Normally, this stored hot water is used for hot water supply, and if the stored hot water is insufficient, hot water heated by a combustion type auxiliary heat source unit is supplied. Because the required amount of heat is stored each time, heat loss is reduced, the storage tank can be made smaller, and because an auxiliary heat source unit is provided, situations where hot water cannot be dispensed are prevented.
[0007] Heat pump-type heat sources are more energy-efficient than auxiliary heat sources, so increasing the proportion of hot water stored in a heat pump-type heat source improves energy efficiency and reduces running costs. However, since the capacity of the hot water storage tank is limited, increasing the proportion of hot water stored must be done by raising the storage temperature or increasing the output of the heat source while storing and dispensing hot water. Generally, the lower the output of a heat source and the lower the storage temperature, the better the coefficient of performance (COP), which is an indicator of energy efficiency. Therefore, raising the storage temperature and increasing the output of the heat source will lower the coefficient of performance of the heat source, and doing so more than necessary may actually decrease energy efficiency.
[0008] Therefore, in view of the above-mentioned problems, the present invention aims to provide a hot water storage and supply system that can promote highly energy-efficient hot water storage. [Means for solving the problem]
[0009] The hot water storage system of the invention of claim 1 comprises a hot water storage tank for storing hot water, a heat source unit that performs a hot water storage operation to heat the hot water in the hot water storage tank and store it in the hot water storage tank, a hot water outlet passage for dispensing hot water from the hot water storage tank, a hot water outlet heat amount detection means for detecting the amount of heat discharged from the hot water outlet passage, a hot water storage heat amount detection means for detecting the amount of heat stored in the hot water storage tank, and a control means that predicts the required amount of heat for each time period divided into predetermined unit time intervals based on the amount of heat discharged and the hot water discharge record including the time of discharge detected by the hot water outlet heat amount detection means, and controls the hot water storage operation to store the sum of the required heat amounts for a predetermined period. In this system, the control means is configured such that, during hot water storage operation, it sets the amount of heat that can be stored for each time period to be the smaller of the amount of heat that is scheduled to be stored at the end of each time period or the maximum amount of heat that can be stored in the hot water storage tank, and if either of these amounts of heat that can be stored is equal to or greater than the required amount of heat for the corresponding time period, it sets the output of the heat source unit and the hot water storage temperature so as to maximize the coefficient of performance of the heat source unit, and if either of the amounts of heat that can be stored is less than the required amount of heat for the corresponding time period, it sets the output of the heat source unit and the hot water storage temperature according to the determination of whether the output of the heat source unit is insufficient or the maximum amount of heat that can be stored has been reached.
[0010] According to the above configuration, the hot water storage and supply system predicts the required heat amount for each time period divided into predetermined unit time intervals based on past hot water output records, and stores the total required heat amount for the predetermined period. At this time, if the amount of heat that can be stored at the end of each time period is equal to or greater than the required heat amount for each time period, the system sets the output of the heat source unit and the hot water storage temperature to maximize the coefficient of performance of the heat source unit and performs hot water storage operation. On the other hand, if the amount of heat that can be stored at the end of each time period is less than the required heat amount for each time period, the system determines whether the cause of the decrease is insufficient output of the heat source unit or reaching the maximum hot water storage heat capacity limited by the hot water storage tank, and sets the output of the heat source unit and the hot water storage temperature according to the cause. Therefore, when it is possible to store the required amount of hot water, it can be stored with high energy efficiency, and when it is not possible to store the required amount of hot water, the output of the heat source unit and the hot water storage temperature can be set according to the cause to mitigate the decrease in energy efficiency.
[0011] The hot water storage and supply system of the invention of claim 2 is characterized in that, in the invention of claim 1, the control means is configured such that, when both insufficient output of the heat source unit and the arrival of the maximum hot water storage heat capacity are met, the heat source unit is determined to be insufficient output if the current amount of hot water storage heat is less than a preset standard value, and the maximum hot water storage heat capacity is determined to be reached if the current amount of hot water storage heat is equal to or greater than the standard value. With the above configuration, when both insufficient output and reaching the maximum hot water storage capacity are met, it is possible to easily determine whether there is an insufficient output or the maximum hot water storage capacity has been reached based on the current amount of hot water stored.
[0012] The hot water storage and supply system of the invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the control means is configured to set the hot water storage temperature to a preset upper limit temperature when it is determined that the maximum hot water storage heat capacity has been reached, and to set the output of the heat source to the minimum output that can reach the maximum hot water storage heat capacity of the hot water storage tank. According to the above configuration, if the required amount of hot water cannot be stored to reach the maximum hot water storage capacity, the output of the heat source unit is set to the minimum output that can reach the maximum hot water storage capacity, delaying the arrival of the maximum hot water storage capacity. Since the coefficient of performance of the heat source unit improves as the output decreases, the decrease in energy efficiency can be mitigated even if the hot water storage temperature is at the upper limit temperature.
[0013] The hot water storage and supply system of the invention of claim 4 is characterized in that, in the invention of claim 1 or 2, when the control means determines that the output of the heat source is insufficient, it sets the hot water storage temperature to a lower limit temperature corresponding to the hot water supply set temperature and sets the output of the heat source to a predetermined maximum output. According to the above configuration, if the required amount of hot water cannot be stored due to insufficient output from the heat source unit, the output of the heat source unit is maximized, and the hot water storage temperature is set to the lower limit temperature at which hot water can be dispensed at the set hot water supply temperature, thereby quickly supplying hot water that can be dispensed at the set hot water supply temperature to the hot water storage tank. As the coefficient of performance of the heat source unit improves as the hot water storage temperature decreases, the decrease in energy efficiency can be mitigated even when the heat source unit is at maximum output. [Effects of the Invention]
[0014] According to the hot water storage and supply system of the present invention, it is possible to promote highly energy-efficient hot water storage.
Brief Description of the Drawings
[0015] [Figure 1] It is a configuration diagram of the hot water storage and supply system according to an embodiment of the present invention. [Figure 2] It is a diagram showing the prediction of the required heat quantity according to an embodiment. [Figure 3] It is a flowchart of the hot water storage condition setting according to an embodiment.
Modes for Carrying Out the Invention
[0016] Hereinafter, modes for carrying out the present invention will be described based on examples.
Examples
[0017] First, the hot water storage and supply system 1 will be described based on FIG. 1. The hot water storage and supply system 1 includes a heat pump type main heat source machine 10 (heat source machine), a hot water storage unit 20 including a hot water storage tank 21, and an auxiliary heat source machine 40. The auxiliary heat source machine 40 is, for example, a combustion type heat source machine, and reheats the hot water supplied from the hot water storage unit 20 through the hot water passage 41 according to its temperature, or supplies it to, for example, a hot water tap 8 in the hot water supply passage 42 without reheating.
[0018] At the lower part of the hot water storage tank 21, a main heat source machine forward passage 23 provided with a pump 22 is connected to supply the hot water in the hot water storage tank 21 to the main heat source machine 10. At the upper part of the hot water storage tank 21, a main heat source machine return passage 24 for returning the hot water heated by the main heat source machine 10 to the hot water storage tank 21 is connected. In the middle of the main heat source machine return passage 24, a switching valve 25 for switching the flow path of the hot water is arranged, and a return branch passage 24a branched from the main heat source machine return passage 24 by the switching valve 25 is connected to the upstream side part of the pump 22 in the main heat source machine forward passage 23.
[0019] Upstream of the switching valve 25 in the main heat source return passage 24, a return temperature sensor 24b is installed to detect the temperature of the hot water heated by the main heat source 10. For example, if the temperature detected by the return temperature sensor 24b is low immediately after starting up the main heat source 10, the switching valve 25 is switched from the hot water storage tank 21 side to the return branch passage 24a side, and the hot water is circulated without being returned to the hot water storage tank 21 until it can be heated sufficiently.
[0020] A water supply passage 26 for supplying tap water is connected to the bottom of the hot water storage tank 21, as indicated by the arrow CW. A hot water outlet passage 27 for discharging the hot water from the hot water storage tank 21 to the hot water storage unit 20 is connected to the top of the hot water storage tank 21. A water supply branch passage 26a, which branches off from the water supply passage 26, is connected to a mixing valve 28 located in the middle of the hot water outlet passage 27. Multiple hot water storage temperature sensors 21a to 21d are installed in the hot water storage tank 21, which can detect the temperature and amount of hot water stored in the hot water storage tank 21. These hot water storage temperature sensors 21a to 21d correspond to the hot water heat quantity detection means.
[0021] A water supply temperature sensor 26b is installed in the water supply passage 26 to detect the temperature of the tap water supplied from the water supply passage 26 (water supply temperature). A hot water outlet passage 27 is installed in the hot water outlet passage 27, a hot water outlet temperature sensor 27b and a hot water outlet temperature sensor 27c. The hot water outlet flow rate sensor 27a detects the flow rate of hot water from the hot water storage unit 20. The hot water outlet temperature sensor 27b detects the temperature of the hot water dispensed from the hot water storage tank 21 (hot water storage tank outlet temperature). The hot water outlet temperature sensor 27c detects the temperature of the hot water dispensed from the hot water storage unit 20. Based on the flow rate of hot water dispensed by the hot water outlet flow rate sensor 27a and the temperature of hot water dispensed by the hot water outlet temperature sensor 27c, the amount of heat from the dispensed hot water is detected (calculated). The hot water outlet flow rate sensor 27a and the hot water outlet temperature sensor 27c correspond to the means for detecting the amount of heat from the dispensed hot water.
[0022] The hot water outlet passage 27 of the hot water storage unit 20 and the water inlet 40a of the auxiliary heat source unit 40 are connected by a hot water passage 41. The hot water outlet 40b of the auxiliary heat source unit 40 is connected to a hot water supply passage 42 which is connected to a hot water tap 8. The hot water dispensed from the hot water storage unit 20 is supplied to the hot water tap 8 via the auxiliary heat source unit 40, and hot water is supplied from the hot water tap 8 as indicated by the arrow HW.
[0023] The hot water storage unit 20 has a control unit 29 (control means) for controlling the hot water storage operation, which involves driving a pump 22 to circulate hot water between the hot water storage tank 21 and the main heat source unit 10, and storing the hot water heated by the main heat source unit 10 from the top of the hot water storage tank 21. Based on the hot water outlet temperature of the hot water storage tank, the water supply temperature, and the hot water flow rate, the control unit 29 adjusts the mixing ratio in the mixing valve 28 to dispense hot water so that the temperature detected by the hot water outlet temperature sensor 27c becomes, for example, a preset hot water supply set temperature or a predetermined temperature. The predetermined temperature is set so that the auxiliary heat source unit 40 heats the hot water supplied from the hot water storage unit 20 to the hot water supply set temperature and dispenses it.
[0024] For example, an operating terminal 30 is installed on the wall of an indoor area such as a kitchen, which is equipped with a display unit that shows information related to hot water supply and hot water storage operation, and is used to set the hot water temperature. This operating terminal 30 is connected to the auxiliary heat source unit 40 in a communicative manner and is configured to supply hot water at the hot water temperature set on the operating terminal 30 to the hot water tap 8. In addition, the operating terminal 30 is connected to the control unit 29 of the hot water storage unit 20 in a communicative manner via the auxiliary heat source unit 40, and can perform setting operations related to hot water storage operation.
[0025] The control unit 29 has a function to learn and store as hot water output history the time of hot water output from the hot water storage unit 20 due to hot water supply, and the amount of heat output calculated from the hot water flow rate detected by the hot water flow rate sensor 27a and the hot water temperature detected by the hot water temperature sensor 27c. Then, as shown in Figure 2 for example, based on the learned and stored past hot water output history, it predicts the required amount of heat for future hot water supply use in time periods divided into predetermined unit time (e.g., 1 hour), and controls the hot water storage operation based on this required amount of heat.
[0026] The control unit 29 obtains the current amount of stored heat in the hot water storage tank 21 and calculates a first heat quantity by summing the required heat quantities for the time periods corresponding to a predetermined length, starting from the time period following the time period to which the current time belongs. As shown in Figure 2, if the required heat quantity is predicted and the current time is 16:00, the control unit 29 obtains the current amount of stored heat in the hot water storage tank 21 and calculates a first heat quantity by summing the required heat quantities (prediction 1, prediction 2) for the time periods A2 to A4 from 17:00 to 20:00, corresponding to the first period T1 (for example, 3 hours), starting from time period A2 following time period A1 in the 16:00 hour. If the first heat quantity is greater than the current amount of stored heat, the conditions for starting the main heat source unit 10 are met, and the main heat source unit 10 is started to begin hot water storage operation.
[0027] Furthermore, the required heat quantities (prediction 1, prediction 2, prediction 3, prediction 4) for the second period T2 (from 16:00 to 23:00), which is a predetermined length (for example, 7 hours) longer than the first period T1, are added together from the next period A2 following the current time period A1 of 16:00, to calculate the second heat quantity. When the second heat quantity falls below the current hot water storage heat quantity, the conditions for stopping the main heat source unit 10 are met, and the main heat source unit 10 is stopped, ending the hot water storage operation. The hot water storage operation also ends when the current hot water storage heat quantity reaches the maximum amount of heat that can be stored in the hot water storage tank 21 (maximum hot water storage heat quantity).
[0028] The control unit 29 sets the hot water storage conditions for storing the required amount of hot water at the start of the hot water storage operation. This setting of hot water storage conditions will be explained based on the flowchart in Figure 3. In the figure, Si (i=1,2,···) represents a step.
[0029] First, in S1, the value of the variable n used to count the time period is initialized to zero, and the process proceeds to S2. Then, in S2, the current amount of heat stored in the hot water storage tank 21 is obtained, and the process proceeds to S3. Next, in S3, the value of the variable n is increased by 1, and the process proceeds to S4.
[0030] In S4, time zone A n The amount of heat that can be held Q n However, during this time period A n Required heat quantity R nIt is determined whether it is as described above. Here, since the hot water storage tank 21 cannot store a heat quantity exceeding its maximum hot water storage heat quantity, the possible heat quantity Q n is set to the smaller of the hot water storage heat quantity scheduled at the end of time zone A n or the maximum hot water storage heat quantity of the hot water storage tank 21. The hot water storage heat quantity scheduled at the end of time zone A n is calculated in consideration of the heat quantity inflow and outflow in time zone A n . Specifically, it is the heat quantity obtained by subtracting the required heat quantity (the heat quantity predicted to be discharged in time zone A n ) from the hot water storage heat quantity or the possible heat quantity Q n-1 at the start of time zone A n , and adding the heat quantity that can be stored at the maximum output of the main heat source machine 10 in time zone A n .
[0031] It is determined whether the reason for the inability to store the required amount of hot water is that the maximum amount of hot water that can be stored in the hot water storage tank 21 during this time period is reached. If the determination in S7 is Yes, the process proceeds to S8, where it is determined whether the reason for the inability to store the required amount of hot water is insufficient output from the main heat source unit 10.
[0034] If the determination in S8 is Yes, proceed to S9, where it is determined whether the amount of heat that can be stored in any of the previous time periods is equal to the maximum amount of hot water stored. This step determines whether the maximum amount of hot water stored has already been reached at the start of the current time period. The previous time period refers to a time period prior to the time period in which it was determined that the required amount of hot water could not be stored. For example, this would be time periods A1 and A2 when it was determined that the required amount of hot water could not be stored in time period A3, and not a time period prior to the time period to which the current time belongs. Therefore, in the case of time period A1, the determination in S9 is No. If the determination in S9 is No, proceed to S10, where it is determined whether the current amount of hot water stored is equal to or greater than a preset reference value. The reference value is set, for example, to 70% of the maximum amount of hot water stored in the hot water storage tank 21, but is not limited to this and can be set based on the heating capacity of the main heat source unit 10 and the capacity of the hot water storage tank 21, etc.
[0035] If the judgment in S10 is Yes, if the judgment in S9 is Yes, or if the judgment in S8 is No (indicating no output deficiency), the process proceeds to S11. In S11, the reason why the required amount of hot water cannot be stored is determined to be reaching the maximum hot water storage capacity, and the process proceeds to S12. In S12, the hot water storage temperature is set to the upper limit temperature predetermined in the specifications, and the minimum output of the main heat source unit 10 that can reach the maximum hot water storage capacity during this time period is set to complete the hot water storage condition setting. The lower the output of the main heat source unit 10 and the lower the hot water storage temperature, the higher the coefficient of performance (COP). Therefore, until the maximum hot water storage capacity is reached, the decrease in COP due to the hot water storage temperature being set to the upper limit temperature is mitigated, promoting highly energy-efficient hot water storage.
[0036] If the result of S7 is No (indicating insufficient output), the process proceeds to S13, where it is determined whether the amount of heat that can be held in any of the previous time periods is equal to the maximum amount of hot water storage heat. The previous time period refers to a time period prior to the time period in which it was determined that the required amount of hot water could not be stored, as in S9 above, and is not a time period prior to the time period to which the current time belongs. Therefore, in the case of time period A1, the result of S13 is No. If the result of S13 is Yes, the process proceeds to S11, where it is determined that the reason for the inability to store the required amount of hot water is reaching the maximum amount of hot water storage heat, and the process proceeds to S11. The process from S11 onwards is the same as above, so the explanation is omitted.
[0037] If the judgment in S13 is No, or if the judgment in S10 is No, the process proceeds to S14, where it is determined that the reason why the required amount of hot water cannot be stored is insufficient output from the main heat source unit 10, and the process proceeds to S15. In S15, the hot water storage temperature is adjusted to the hot water supply set temperature, setting it to the lower limit temperature at which hot water can be dispensed, i.e., the lower limit temperature corresponding to the hot water supply set temperature, and the maximum output of the main heat source unit 10 is set to complete the hot water storage condition setting. The lower the output of the main heat source unit 10 and the lower the hot water storage temperature, the higher the coefficient of performance (COP). Therefore, the decrease in COP due to setting the output to maximum can be mitigated, while increasing the supply flow rate of hot water that can be dispensed to the hot water storage tank 21, thereby promoting highly energy-efficient hot water storage.
[0038] The operation and effects of the above-described hot water storage and supply system 1 will be explained. The hot water storage and supply system 1 predicts the required amount of heat for each time period divided into predetermined unit time intervals based on past hot water output records, and stores the total amount of heat required for the predetermined period. At this time, each time period A n Required heat quantity R n In contrast, the amount of heat that can be held at the end of each time period is Q. n If all of these conditions are equal or better, the output of the main heat source unit 10 and the hot water storage temperature are set to maximize the coefficient of performance (COP) of the main heat source unit 10, and the hot water storage operation is performed. Meanwhile, the required heat quantity R for each time period n In contrast, the amount of heat that can be held at the end of each time period is Q. nIf either of these decreases, it is determined whether the cause is insufficient output from the main heat source unit 10 or the limit reached by the hot water storage tank 21, and the output of the main heat source unit 10 and the hot water storage temperature are set according to the cause. Therefore, the required heat quantity R n When hot water storage is possible, hot water can be stored with high energy efficiency, and the required heat amount R n If hot water storage is not possible, the output of the main heat source unit 10 and the hot water storage temperature can be set according to the cause to mitigate the decrease in energy efficiency.
[0039] The control unit 29 determines the required heat quantity R n If the reason for the inability to store hot water is insufficient output of the main heat source unit 10 and the reaching of the maximum hot water storage capacity, the system determines whether the main heat source unit 10 is insufficient output or has reached its maximum storage capacity based on the current hot water storage capacity and a preset standard value. If both insufficient output and the reaching of the maximum storage capacity are present, it is possible to easily determine whether the system is insufficient output or has reached its maximum storage capacity based on the current hot water storage capacity.
[0040] The control unit 29 determines the amount of heat R required to reach the maximum hot water storage heat capacity. n If hot water storage is not possible, the output of the main heat source unit 10 is set to the minimum output that can reach the maximum hot water storage heat capacity, delaying the arrival of the maximum hot water storage heat capacity. Since the coefficient of performance (COP) of the main heat source unit 10 improves as the output decreases, the decrease in energy efficiency can be mitigated even if the hot water storage temperature is at the upper limit temperature.
[0041] The control unit 29, when the main heat source unit 10 cannot store the required amount of hot water due to insufficient output, maximizes the output of the main heat source unit 10 and sets the hot water storage temperature to the lower limit temperature at which hot water can be dispensed at the set hot water supply temperature, thereby quickly supplying hot water that can be dispensed at the set hot water supply temperature to the hot water storage tank 21. Since the coefficient of performance (COP) of the main heat source unit 10 improves as the hot water storage temperature decreases, the decrease in energy efficiency can be mitigated even when the main heat source unit 10 is at maximum output.
[0042] Furthermore, those skilled in the art can implement the present invention in various forms with modifications to the above embodiments without departing from the spirit of the invention, and the present invention encompasses such modifications. [Explanation of Symbols]
[0043] 1: Hot water storage and supply system 8: Hot water tap 10: Main heat source machine (heat source machine) 20: Hot water storage unit 21: Hot water storage tank 21a~21d: Hot water storage temperature sensor (means for detecting the heat quantity of hot water storage) 22: Pump 23: Passage to the heat source unit 24: Heat source return passage 24a: Return branch passage 24b: Return temperature sensor 25: Switching valve 26:Water supply passage 26a: Water supply branching passage 26b: Water supply temperature sensor 27: Hot spring access passage 27a: Hot water flow sensor 27b: Hot water storage tank outlet temperature sensor 27c: Hot water temperature sensor 28: Mixing valve 29: Control unit (control means) 30: Operating terminal 40:Auxiliary heat source machine 41: Hot water passage 42: Hot water supply passage
Claims
1. A hot water storage and supply system comprising: a hot water storage tank for storing hot water; a heat source unit that performs a hot water storage operation to heat the hot water in the hot water storage tank and store it in the hot water storage tank; a hot water outlet passage for dispensing hot water from the hot water storage tank; a hot water outlet heat amount detection means for detecting the amount of heat discharged from the hot water outlet passage; a hot water storage heat amount detection means for detecting the amount of heat stored in the hot water storage tank; and a control means that predicts the required amount of heat for each time period divided into predetermined unit time intervals based on the amount of heat discharged and the hot water discharge record including the time of discharge detected by the hot water outlet heat amount detection means, and controls the hot water storage operation to store the sum of the required heat amounts for a predetermined period, The control means is configured to set the amount of heat that can be stored for each time period as the smaller of the amount of heat that is scheduled to be stored at the end of each time period or the maximum amount of heat that can be stored in the storage tank, as the amount of heat that can be stored for each time period during the storage operation, and if either of these amounts of heat can be stored is equal to or greater than the required amount of heat for the corresponding time period, the output of the heat source unit and the storage temperature are set so as to maximize the coefficient of performance of the heat source unit, and if either of the amounts of heat that can be stored is less than the required amount of heat for the corresponding time period, the output of the heat source unit and the storage temperature are set according to the determination of whether the output of the heat source unit is insufficient or the maximum amount of heat that can be stored has been reached.
2. The hot water storage and supply system according to claim 1, characterized in that the control means is configured to determine that the heat source has insufficient output when the current amount of stored hot water is less than a preset standard value, and to determine that the maximum amount of stored hot water has been reached when the current amount of stored hot water is equal to or greater than the standard value.
3. The hot water storage and supply system according to claim 1 or 2, characterized in that the control means is configured to set the hot water storage temperature to a preset upper limit temperature when it is determined that the maximum hot water storage heat capacity has been reached, and to set the output of the heat source to the minimum output that can reach the maximum hot water storage heat capacity of the hot water storage tank.
4. The hot water storage and supply system according to claim 1 or 2, characterized in that, when the control means determines that the output of the heat source is insufficient, it sets the hot water storage temperature to a lower limit temperature corresponding to the hot water supply set temperature and sets the output of the heat source to a predetermined maximum output.