A low-energy consumption hot water centralized control and management system based on a hot water storage tank

Abstract

The present invention belongs to the technical field of hot water energy-saving management, and relates to a low-energy-consumption hot water centralized control system based on a hot water storage tank. An air temperature detection module is used to detect the real-time outdoor temperature; a worksheet unit is used to preset the corresponding liquid level and water temperature information in the hot water storage tank under the corresponding outdoor temperature and hot water usage time period; a control unit is used to control the operation of a water replenishment module and a hot water production circulation pipeline module according to the time information in the clock unit, the real-time outdoor temperature, and the preset information in the worksheet unit, so that the water in the hot water storage tank reaches the corresponding liquid level and water temperature; the control unit is also used to control the operation of the hot water usage circulation pipeline module during the hot water usage time period, so that the water in the hot water storage tank circulates in the hot water usage circulation pipeline module. The present invention can improve the daily management efficiency of the hot water supply system and the energy utilization rate on the basis of ensuring normal hot water supply.

Description

Technical Field

[0001] The present invention belongs to the technical field of hot water energy-saving management, and particularly relates to a low-energy-consumption hot water centralized control system based on a hot water storage tank. Background Art

[0002] The supply of domestic hot water in hospital wards and school collective dormitory buildings is a facility that must be configured in buildings. For example, in the student dormitory buildings of colleges and universities, in order to ensure the daily washing and grooming needs of students, hot water is supplied continuously every day throughout the semester. Even during the school holidays, some students stay on campus for study or experiments, and the centralized supply of domestic hot water is also turned on during the summer vacation. As the energy consumption ratio of collective dormitories, in addition to the energy consumption of air conditioners, the energy consumption of domestic hot water is also a major energy-consuming item in student collective dormitories.

[0003] At present, in order to reduce the energy consumption cost per unit building and facilitate operation and management, the hot water supply method for such collective dormitory buildings generally uses air source heat pump units with higher efficiency to produce hot water; at the same time, in order to avoid complaints from residents (students) due to hot water supply, the circulating water pump supplies hot water day and night for 24 hours. As a simple and fixed operation method, with constant temperature and time, it actually belongs to over-supply of hot water, and there are a large number of unnecessary losses in the whole operation process: pipeline heat loss, pump operation loss, water tank body heat loss, repeated heating of hot water in the water tank by the air source heat pump unit, etc. In addition, for the domestic hot water supply method based on air source heat pumps, the air source heat pump unit and the hot water storage tank form a closed-loop system through a supporting circulating water pump, and this system is generally completed by the manufacturer; the hot water storage tank and the domestic hot water use area form another closed-loop system, and this system is generally completed by the building construction unit. The two systems are separated and cannot be integrated for management. In the market, there are also no such technologies and measures for in-depth management, and a large amount of ineffective energy is consumed during this period.

[0004] Therefore, how to improve the daily operation efficiency of the hot water supply system and thus enhance the energy utilization rate is a topic worthy of our in-depth research and discussion. Summary of the Invention

[0005] In view of the above problems existing in the existing management technology, the present invention provides a low-energy-consumption hot water centralized control system based on a hot water storage tank, which can improve the daily operation efficiency of the hot water production and use process on the basis of ensuring the normal demand for hot water supply, and thus enhance the effective utilization rate of energy.

[0006] The present invention adopts the following technical solutions:

[0007] A low - energy - consumption hot - water centralized control system based on a heat - storage water tank, including a water - replenishing module, a heat - storage water tank, a hot - water production circulation pipeline module, a hot - water usage circulation pipeline module, a control module, and an air - temperature detection module. The heat - storage water tank is respectively connected to the water - replenishing module, the hot - water production circulation pipeline module, and the hot - water usage circulation pipeline module;

[0008] The control module includes a clock unit, a control unit, and a worksheet unit. The control unit is respectively communicatively connected to the clock unit, the worksheet unit, the air - temperature detection module, the water - replenishing module, the hot - water production circulation pipeline module, and the hot - water usage circulation pipeline module;

[0009] The air - temperature detection module is used to detect the outdoor real - time temperature; the worksheet unit is used to preset the corresponding liquid level and water - temperature information in the heat - storage water tank under the corresponding outdoor temperature and hot - water usage time period;

[0010] The control unit is used to control the operation of the water - replenishing module and the hot - water production circulation pipeline module according to the time information in the clock unit, the outdoor real - time temperature, and the preset information in the worksheet unit, so that the water in the heat - storage water tank reaches the corresponding liquid level and water temperature;

[0011] The control unit is also used to control the operation of the hot - water usage circulation pipeline module during the hot - water usage time period, so that the water in the heat - storage water tank circulates in the hot - water usage circulation pipeline module.

[0012] As a preferred solution, the control unit starts to control the water - replenishing module and the hot - water production circulation pipeline module to work at a preset time before the preset hot - water usage time period, so that the water in the heat - storage water tank reaches the corresponding liquid level and water temperature at the start time of the preset hot - water usage time period.

[0013] As a preferred solution, a first temperature sensor and a liquid - level sensor respectively communicatively connected to the control unit are provided in the heat - storage water tank.

[0014] As a preferred solution, the control unit controls the operation of the hot - water production circulation pipeline module according to the temperature detected by the first temperature sensor, so that the water in the heat - storage water tank reaches the corresponding preset water temperature.

[0015] As a preferred solution, the control unit controls the operation of the water - replenishing module according to the liquid level detected by the liquid - level sensor, so that the water in the heat - storage water tank reaches the corresponding preset liquid level.

[0016] As a preferred solution, during the hot - water usage time period:

[0017] If there is a hot - water usage situation, the control unit controls the hot - water usage circulation pipeline module to work, so that the water in the heat - storage water tank circulates in the hot - water usage circulation pipeline module.

[0018] As a preferred solution, the hot water use circulation pipeline module includes a main water supply pipe, a main water return pipe, and a plurality of water use branch pipes connected in parallel between the main water supply pipe and the main water return pipe. A second temperature sensor is provided at the end of the main water return pipe, and the control unit is also communicatively connected to the second temperature sensor;

[0019] The worksheet unit is also used to preset the threshold value of the temperature difference between the supply water and the return water at the corresponding outdoor temperature;

[0020] During the hot water use period:

[0021] If there is no hot water use situation, and the temperature difference between the temperatures detected by the first temperature sensor and the second temperature sensor is greater than the corresponding supply-return water temperature difference threshold, the control unit controls the hot water use circulation pipeline module to operate, so that the water in the hot water storage tank circulates in the hot water use circulation pipeline module.

[0022] As a preferred solution, the hot water use circulation pipeline module includes a main water supply pipe, a main water return pipe, and a plurality of water use branch pipes connected in parallel between the main water supply pipe and the main water return pipe. A first pressure sensor is provided at the beginning of the main water supply pipe, and the control unit is also communicatively connected to the first pressure sensor;

[0023] The worksheet unit is also used to preset the water supply pressure range at the corresponding outdoor temperature and hot water use period;

[0024] During the hot water use period, if there is a hot water use situation:

[0025] When the pressure value detected by the first pressure sensor is lower than the lower limit of the corresponding water supply pressure range, the control unit increases the working frequency of the circulation pump in the hot water use circulation pipeline module. When the pressure value detected by the first pressure sensor is equal to or higher than the upper limit of the corresponding water supply pressure range, the control unit decreases the working frequency of the circulation pump in the hot water use circulation pipeline module.

[0026] As a preferred solution, a plurality of circulation pumps are provided in the hot water use circulation pipeline module, and the control unit controls the number of working circulation pumps in the hot water use circulation pipeline module according to the corresponding water supply pressure range.

[0027] As a preferred solution, the system further includes a remote mobile terminal module communicatively connected to the control module, and the corresponding information can be remotely preset in the worksheet unit through the remote mobile terminal module.

[0028] The beneficial effects of the present invention are:

[0029] In the present invention, the water replenishing module, the hot water production circulation pipeline module, and the hot water usage circulation pipeline module do not always operate, but are controlled according to the water usage demand at the current time and temperature. This can improve the daily management efficiency of the hot water supply system and the energy utilization rate on the basis of ensuring normal hot water supply.

[0030] In the present invention, the control unit starts to control the water replenishing module and the hot water production circulation pipeline module to operate at a preset time before the preset hot water usage time period, so that the water in the hot water storage tank reaches the corresponding liquid level and water temperature at the start time of the preset hot water usage time period. This can avoid the situation where the hot water usage time period has arrived, but the liquid level and water temperature of the water in the hot water storage tank have not reached the requirements.

[0031] During the hot water usage time period: If there is a hot water usage situation, the control unit controls the hot water usage circulation pipeline module to operate, so that the water in the hot water storage tank circulates in the hot water usage circulation pipeline module. It can be seen that in the present invention, even during the hot water usage time period, if there is no hot water usage situation temporarily within this time period, the hot water usage circulation pipeline module does not operate, thereby further reducing the working energy consumption of the hot water usage circulation pipeline module.

[0032] Since in the present invention, during the hot water usage time period, if there is no hot water usage situation temporarily within this time period, the hot water usage circulation pipeline module does not operate. Therefore, if the non - working time is too long, it will cause the water temperature in the hot water usage circulation pipeline module to decrease. When hot water is needed, the temperature of this part of the water is too low, which will lead to a poor user experience. Therefore, in the present invention, by presetting the supply - return water temperature difference threshold at the corresponding outdoor temperature, and when the temperature difference detected by the first temperature sensor and the second temperature sensor is greater than the corresponding supply - return water temperature difference threshold, the control unit controls the hot water usage circulation pipeline module to operate, so that the water in the hot water storage tank circulates in the hot water usage circulation pipeline module, thereby increasing the water temperature in the hot water usage circulation pipeline module.

[0033] In the present invention, the circulation pump in the hot water usage circulation pipeline module not only does not always operate, but even when it operates, it does not always operate at the same power and quantity. Instead, it adjusts the working quantity and working frequency according to the preset water supply pressure range at the corresponding time and temperature, which can reduce the energy consumption to the greatest extent on the basis of ensuring normal hot water supply.

[0034] The present invention also provides a remote mobile terminal module communicatively connected to the control module. Through the remote mobile terminal module, corresponding information can be preset remotely in the work sheet unit to achieve remote control. Description of the Drawings

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0036] Figure 1 is a schematic structural diagram of a low - energy - consumption hot - water centralized control system based on a heat - storage water tank according to the present invention;

[0037] Figure 2 is a schematic structural diagram of a domestic hot - water supply system based on an air - source heat pump;

[0038] In the figure: M, tap water make - up electric valve; T1, first temperature sensor; T2, second temperature sensor; Y, liquid - level sensor; P1, first pressure sensor; P2, second pressure sensor; B1, first circulation pump; B2, second circulation pump; B3, third circulation pump; B4, fourth circulation pump. Detailed implementation manners

[0039] The following illustrates the implementation manners of the present invention through specific specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0040] Embodiment 1:

[0041] Refer to Figure 1 、 Figure 2 As shown, this embodiment provides a low - energy - consumption hot - water centralized control system based on a heat - storage water tank, including a make - up water module, a heat - storage water tank, a hot - water production circulation pipeline module, a hot - water usage circulation pipeline module, a control module, and an air - temperature detection module. The heat - storage water tank is respectively connected to the make - up water module, the hot - water production circulation pipeline module, and the hot - water usage circulation pipeline module;

[0042] The control module includes a clock unit, a control unit, and a worksheet unit. The control unit is respectively communicatively connected to the clock unit, the worksheet unit, the air - temperature detection module, the make - up water module, the hot - water production circulation pipeline module, and the hot - water usage circulation pipeline module; the clock unit is used to record the real - time time. In this embodiment, the control unit uses a PLC programming controller, and the heat - storage water tank uses a non - pressure - bearing hot - water tank;

[0043] The temperature detection module is used to detect the outdoor real-time temperature. In this embodiment, a resistive sensor is adopted, and the accuracy needs to reach 0.1 °C; the worksheet unit is used to preset the corresponding liquid level and water temperature information in the hot water storage tank under the corresponding outdoor temperature and hot water usage time period; the control unit is used to control the operation of the water replenishment module and the hot water production circulation pipeline module according to the time information in the clock unit, the outdoor real-time temperature, and the preset information in the worksheet unit, so that the water in the hot water storage tank reaches the corresponding liquid level and water temperature;

[0044] The control unit is also used to control the operation of the hot water usage circulation pipeline module during the hot water usage time period, so that the water in the hot water storage tank circulates in the hot water usage circulation pipeline module.

[0045] Since the demand for domestic hot water by the collective dormitory personnel is different at different time periods and outdoor real-time temperatures. For example, when the outdoor real-time temperature is high, the temperature of domestic hot water can be lower, and at the same time, the demand for domestic hot water decreases. When the outdoor real-time temperature is low, the temperature of domestic hot water needs to be higher, and at the same time, the demand for domestic hot water increases. From 6:00 to 8:00 in the morning, from 11:30 to 13:30 at noon, and from 17:00 to 22:00 in the afternoon, the demand for domestic hot water is relatively large during these time periods, and the demand for domestic hot water is almost zero during the remaining time periods; during holidays, the hot water usage during the day tends to be uniform.

[0046] Therefore, in the present invention, the worksheet unit presets the corresponding liquid level and water temperature information in the hot water storage tank under the corresponding outdoor temperature and hot water usage time period; the control unit is used to control the operation of the water replenishment module and the hot water production circulation pipeline module according to the time information in the clock unit, the outdoor real-time temperature, and the preset information in the worksheet unit, so that the water in the hot water storage tank reaches the corresponding liquid level and water temperature; the control unit is also used to control the operation of the hot water usage circulation pipeline module during the hot water usage time period, so that the water in the hot water storage tank circulates in the hot water usage circulation pipeline module.

[0047] That is, in the present invention, the water replenishment module, the hot water production circulation pipeline module, and the hot water usage circulation pipeline module are not always in a working state, but are controlled according to the water usage demand at the current time and temperature, which can improve the daily management efficiency of the hot water supply system and the energy utilization rate on the basis of ensuring normal hot water supply.

[0048] In this embodiment, the corresponding liquid level and water temperature information in the hot water storage tank under the corresponding outdoor temperature and time period are illustrated by way of example, which can be referred to as shown in Table 1 and Table 2 below. The time periods of 6:00 - 8:00, 11:30 - 13:30, and 17:00 - 22:00 in the table are the hot water usage time periods, and can be specifically set according to actual needs:

[0049]

[0050] Table 1 Preset liquid level in the hot water storage tank at corresponding air temperatures and time periods

[0051] It should be noted that the percentages in Table 1 refer to the percentages when the liquid level in the hot water storage tank is at the full water level. For example, 50% means 50% of the full water level in the hot water storage tank, and 100% means 100% of the full water level in the hot water storage tank.

[0052]

[0053] Table 2 Preset water temperature in the hot water storage tank at corresponding air temperatures and time periods

[0054] That is, in this embodiment, the control unit controls the operation of the water replenishment module and the hot water production circulation pipeline module according to the time information in the clock unit, the real-time outdoor temperature, the preset liquid level information and water temperature information in the worksheet unit, so that the water in the hot water storage tank reaches the corresponding liquid level and water temperature; the control unit can also control the operation of the hot water use circulation pipeline module according to the time information in the clock unit and the preset hot water use time period information in the worksheet unit, so that the water in the hot water storage tank circulates in the hot water use circulation pipeline module.

[0055] It should be added here that since there may also be a certain demand for hot water preparation during non-hot water use time periods, so during these non-hot water use time periods such as 0:00 - 6:00, 8:00 - 11:30, 13:30 - 17:00, 22:00 - 24:00, the water replenishment module and the hot water production circulation pipeline module can also be controlled to work to preset hot water with a certain liquid level and water temperature in the hot water storage tank for standby.

[0056] Furthermore, since it takes a certain amount of time for the water replenishment module to replenish water and the hot water production circulation pipeline module to heat up, in this embodiment, the control unit starts to control the water replenishment module and the hot water production circulation pipeline module to work at a preset time before the preset hot water use time period, so that the water in the hot water storage tank reaches the corresponding liquid level and water temperature at the start time of the preset hot water use time period. The preset time here can be 2 - 3 hours to provide sufficient time for the water replenishment module to replenish water and the hot water production circulation pipeline module to heat up. Thus, it can avoid the situation where the hot water use time period has arrived, but the liquid level and water temperature of the water in the hot water storage tank have not reached the requirements.

[0057] This control system aims at the fragmented management state of the existing hot water production of air source heat pump units, hot water storage tanks, and the centralized hot water supply system of buildings, and the lack of integrated management technology. It provides a comprehensive energy-saving operation control system. It can effectively solve the problem of refined control of building hot water production, storage, and supply, realize the automatic start-stop and frequency adjustment of hot water units and circulating pumps, solve the difficulty of manual operation, and optimize the existing control technology.

[0058] Specifically:

[0059] Refer to Figure 2 As shown, a first temperature sensor T1 and a liquid level sensor Y are provided in the hot water storage tank and are respectively communicatively connected to the control unit.

[0060] The control unit controls the operation of the hot water production circulation pipeline module according to the temperature detected by the first temperature sensor T1, so that the water in the hot water storage tank reaches the corresponding preset water temperature.

[0061] The control unit controls the operation of the water replenishment module according to the liquid level detected by the liquid level sensor Y, so that the water in the hot water storage tank reaches the corresponding preset liquid level.

[0062] Furthermore, even if the hot water usage time period is preset in the system, there will still be a situation where hot water is not used for a certain period of time within this hot water usage time period. Therefore, in this embodiment, during the hot water usage time period:

[0063] If there is a hot water usage situation, the control unit controls the operation of the hot water usage circulation pipeline module so that the water in the hot water storage tank circulates in the hot water usage circulation pipeline module. If there is temporarily no hot water usage situation, the hot water usage circulation pipeline module does not operate. Thus, the energy consumption of the hot water usage circulation pipeline module is reduced.

[0064] The hot water usage circulation pipeline module includes a water supply main pipe, a return water main pipe, and multiple water usage branch pipes connected in parallel between the water supply main pipe and the return water main pipe. A second temperature sensor T2 is provided at the end of the return water main pipe, and the control unit is also communicatively connected to the second temperature sensor T2.

[0065] During the hot water usage time period, if there is temporarily no hot water usage situation, at this time the hot water usage circulation pipeline module does not operate. Although the conveying pipeline has heat insulation materials and protective measures, the hot water in the hot water usage circulation pipeline will still have pipeline heat loss, resulting in a temperature drop. If the temperature drops too much, when hot water starts to be used, due to the too low hot water temperature, the user experience is poor.

[0066] Therefore, in this embodiment, the worksheet unit is also used to preset the supply-return water temperature difference threshold at the corresponding outdoor temperature;

[0067] During the hot water usage time period:

[0068] If there is no hot water usage and the temperature difference between the temperatures detected by the first temperature sensor T1 and the second temperature sensor T2 is greater than the corresponding supply-return water temperature difference threshold, the control unit controls the hot water usage circulation pipeline module to operate, so that the water in the hot water storage tank circulates in the hot water usage circulation pipeline module, thereby increasing the water temperature in the hot water usage circulation pipeline.

[0069] And in this embodiment, the supply-return water temperature difference threshold is set according to the corresponding outdoor temperature. When the outdoor temperature is relatively high, since the water temperature requirement for domestic hot water is relatively low, the supply-return water temperature difference threshold can be set relatively large; when the outdoor temperature is relatively low, since the water temperature requirement for domestic hot water is relatively high, the supply-return water temperature difference threshold can be set relatively small.

[0070] It should also be noted here that when the temperature difference between the temperatures detected by the first temperature sensor T1 and the second temperature sensor T2 is less than another preset supply-return water temperature difference threshold (this supply-return water temperature difference threshold is less than the aforementioned supply-return water temperature difference threshold, for example, the aforementioned supply-return water temperature difference threshold is 6 °C, and this supply-return water temperature difference threshold can be set to 3 °C), the hot water usage circulation pipeline module stops working.

[0071] Furthermore, on the basis of ensuring normal hot water supply, the energy consumption of the hot water usage circulation pipeline module can be further reduced.

[0072] Further, a first pressure sensor P1 is provided at the starting end of the water supply main pipe, and the control unit is also communicatively connected to the first pressure sensor P1;

[0073] The worksheet unit is also used to preset the water supply pressure range under the corresponding outdoor temperature and hot water usage time period;

[0074] During the hot water usage time period, if there is hot water usage:

[0075] When the pressure value detected by the first pressure sensor P1 is lower than the lower limit of the corresponding water supply pressure range, the control unit increases the working frequency of the circulation pump in the hot water usage circulation pipeline module. When the pressure value detected by the first pressure sensor P1 is equal to or higher than the upper limit of the corresponding water supply pressure range, the control unit decreases the working frequency of the circulation pump in the hot water usage circulation pipeline module.

[0076] There are multiple circulation pumps in the hot water usage circulation pipeline module, and the control unit controls the number of working circulation pumps in the hot water usage circulation pipeline module according to the corresponding water supply pressure range.

[0077] That is, in this embodiment, according to the water consumption requirements of domestic hot water under different air temperatures and hot water usage time periods, a preset water supply pressure range is set. By adjusting and controlling the working quantity and frequency of the circulating pumps in the hot water usage circulation pipeline module, the normal supply of hot water is ensured, and the energy consumption of the hot water usage circulation pipeline module can be further reduced.

[0078] It should be noted here that: Similarly, the control unit can control the quantity of the circulating pumps and heat pump water heaters in the hot water production circulation pipeline module according to the preset water temperature and liquid level information (since too small a water flow rate is related to the safety of the unit, the hot water production circulation system is generally fixed-frequency). The circulating pumps in the hot water production circulation pipeline module include the third circulating pump B3 and the fourth circulating pump B4, and the heat pump water heaters in the hot water production circulation pipeline module include heat pump water heater A and heat pump water heater B.

[0079] Furthermore, a second pressure sensor P2 is provided at the end of the return water main pipe. The control unit is also communicatively connected to the second pressure sensor P2. The detected value of the second pressure sensor P2 is used to determine whether the hot water usage circulation pipeline module is normal. If it is not normal, the operation is stopped.

[0080] The system further includes a remote mobile terminal module communicatively connected to the control module. Through the remote mobile terminal module, corresponding information can be preset in the worksheet unit remotely. It should be noted that remote control can also be achieved through the remote mobile terminal module to manually control the operation of the water replenishment module, hot water production circulation pipeline module, and hot water usage circulation pipeline module in real time.

[0081] The system further includes an operation panel display module, which is used to display the numerical information of each sensor and the working state information of each circulating pump and heat pump water heater.

[0082] It should also be noted that the above control system is applicable not only to school buildings but also to hospitals, hotels, restaurants and other buildings.

[0083] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope of the present invention.

Claims

1. A low-energy consumption hot water centralized control and management system based on a heat storage water tank, characterized in that, It includes a water replenishing module, a hot water storage tank, a hot water production circulation pipeline module, a hot water usage circulation pipeline module, a control module, and an air temperature detection module. The hot water storage tank is respectively connected to the water replenishing module, the hot water production circulation pipeline module, and the hot water usage circulation pipeline module; The control module includes a clock unit, a control unit, and a work sheet unit. The control unit is respectively communicatively connected to the clock unit, the work sheet unit, the air temperature detection module, the water replenishing module, the hot water production circulation pipeline module, and the hot water usage circulation pipeline module; The air temperature detection module is used to detect the real-time outdoor temperature; the work sheet unit is used to preset the corresponding liquid level and water temperature information in the hot water storage tank under the corresponding outdoor temperature and hot water usage time period; The control unit is used to control the work of the water replenishing module and the hot water production circulation pipeline module according to the time information in the clock unit, the real-time outdoor temperature, and the preset information in the work sheet unit, so that the water in the hot water storage tank reaches the corresponding liquid level and water temperature; The control unit is also used to control the work of the hot water usage circulation pipeline module during the hot water usage time period, so that the water in the hot water storage tank circulates in the hot water usage circulation pipeline module; The control unit starts to control the water replenishing module and the hot water production circulation pipeline module to work at a preset time before the preset hot water usage time period, so that the water in the hot water storage tank reaches the corresponding liquid level and water temperature at the start time of the preset hot water usage time period; A first temperature sensor and a liquid level sensor respectively communicatively connected to the control unit are provided in the hot water storage tank; During the hot water usage time period: If there is a hot water usage situation, the control unit controls the hot water usage circulation pipeline module to work, so that the water in the hot water storage tank circulates in the hot water usage circulation pipeline module; The hot water usage circulation pipeline module includes a water supply main pipe, a water return main pipe, and a plurality of water usage branch pipes connected in parallel between the water supply main pipe and the water return main pipe. A second temperature sensor is provided at the end of the water return main pipe. The control unit is also communicatively connected to the second temperature sensor; The work sheet unit is also used to preset the supply-return water temperature difference threshold under the corresponding outdoor temperature; During the hot water usage time period: If there is no hot water usage situation, and the temperature difference between the temperatures detected by the first temperature sensor and the second temperature sensor is greater than the corresponding supply-return water temperature difference threshold, the control unit controls the hot water usage circulation pipeline module to work, so that the water in the hot water storage tank circulates in the hot water usage circulation pipeline module.

2. The low - energy - consumption hot - water centralized control and management system based on a heat storage water tank according to claim 1, characterized in that, The control unit controls the work of the hot water production circulation pipeline module according to the temperature detected by the first temperature sensor, so that the water in the hot water storage tank reaches the corresponding preset water temperature.

3. A low-energy consumption hot water centralized control and management system based on a heat storage water tank according to claim 1, characterized in that, The control unit controls the work of the water replenishing module according to the liquid level detected by the liquid level sensor, so that the water in the hot water storage tank reaches the corresponding preset liquid level.

4. A low-energy hot water centralized control and management system based on a heat storage water tank according to claim 1, characterized in that A first pressure sensor is provided at the starting end of the water supply main pipe. The control unit is also communicatively connected to the first pressure sensor; The work sheet unit is also used to preset the water supply pressure range under the corresponding outdoor temperature and hot water usage time period; During the hot water usage time period, if there is a hot water usage situation: When the pressure value detected by the first pressure sensor is lower than the lower limit of the corresponding water supply pressure range, the control unit increases the operating frequency of the circulation pump in the hot water usage circulation pipeline module. When the pressure value detected by the first pressure sensor is equal to or higher than the upper limit of the corresponding water supply pressure range, the control unit decreases the operating frequency of the circulation pump in the hot water usage circulation pipeline module.

5. The low-energy-consumption hot water centralized control and management system based on a heat storage water tank according to claim 4, characterized in that, There are multiple circulation pumps in the hot water usage circulation pipeline module, and the control unit controls the number of operating circulation pumps in the hot water usage circulation pipeline module according to the corresponding water supply pressure range.

6. The low-energy hot water centralized control and management system based on a hot water storage tank according to claim 1, characterized in that The system further includes a remote mobile terminal module communicatively connected to the control module, and corresponding information can be preset remotely through the remote mobile terminal module in the worksheet unit.

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