Time-sharing temperature control and frequency control method, device and medium for closed pressure-bearing hot water system

Abstract

The present application relates to the technical field of heat pump heating, and particularly relates to a time-sharing temperature control and frequency control method, equipment and medium for a closed pressure-bearing hot water system. The time-sharing temperature control and frequency control method for the closed pressure-bearing hot water system comprises the following steps: obtaining a current ambient temperature; in a valley electricity time period, controlling the operating frequency of the heat pump host according to the ambient temperature and a first heat pump frequency control model to store heat in the heat storage unit until the liquid in the heat storage unit is stored to a target temperature; and in a non-valley electricity time period, controlling the operating frequency of the heat pump host according to the ambient temperature and a second heat pump frequency control model to supplement heat to the heat storage unit. The time-sharing temperature control and frequency control method for the closed pressure-bearing hot water system stores heat by time-sharing temperature control and frequency control, reduces the operation of the closed pressure-bearing hot water system in the valley electricity and peak electricity time periods, realizes peak shifting and valley filling, relieves the electricity pressure in the peak electricity time period, effectively reduces the operation cost of the closed pressure-bearing hot water system, saves electricity bills, and is economical.

Description

Technical Field

[0001] This invention relates to the field of heat pump heating technology, and in particular to a time-sharing temperature and frequency control method, equipment and medium for a closed pressurized hot water system. Background Technology

[0002] Traditional domestic and commercial hot water usage is concentrated in a specific timeframe, with the highest water consumption during peak hours and lower consumption during off-peak hours. In some cities, peak electricity prices are significantly higher than off-peak prices. For example, cities requiring a peak-to-valley difference rate exceeding 40% have a peak-to-valley price ratio of no less than 4:1, while other cities require a ratio of no less than 3:1. Peak-hour prices are often higher than 20% above peak-hour prices. Existing traditional hot water systems use level switches for water replenishment, meaning water is added and heated only as needed. This lack of efficient allocation of heating time results in the system operating extensively during off-peak and normal electricity hours, leading to high operating costs and poor economic efficiency. Summary of the Invention

[0003] This invention provides a time-sharing temperature and frequency control method, equipment, and medium for a closed-loop pressurized hot water system, aiming to alleviate the pressure on electricity consumption during peak power periods.

[0004] In a first aspect, embodiments of the present invention provide a time-sharing temperature and frequency control method for a closed-loop pressurized hot water system. This method is used in a closed-loop pressurized hot water system, which includes a heating unit and a heat storage unit. The heating unit includes a heat pump unit for heating liquid. The time-sharing temperature and frequency control method for the closed-loop pressurized hot water system includes: acquiring the current ambient temperature; during off-peak hours, controlling the operating frequency of the heat pump unit according to the ambient temperature and a first heat pump frequency control model to store heat in the heat storage unit until the liquid in the heat storage unit reaches a target temperature. The first heat pump frequency control model includes: when T > t1, controlling the heat pump unit to operate in a first frequency range; when t1 > T > t2, controlling the heat pump unit to operate in a second frequency range; when T < t2, controlling the heat pump unit to operate in a third frequency range, where T is the ambient temperature, t0 is the target temperature, t1 is a first preset temperature, t2 is a second preset temperature, t0 > t1 > t2, the third frequency range is higher than the second frequency range, and the second frequency range is higher than the first frequency range.

[0005] According to the foregoing embodiments of the first aspect of the present invention, the heat storage unit includes a first liquid storage module, a second liquid storage module, and a third liquid storage module connected in series, with the first liquid storage module and the third liquid storage module respectively disposed at the beginning and end of the heat storage unit; the heating unit further includes a heating water tank, and the heat pump host is capable of delivering heated liquid to the heating water tank, the heating water tank being connected to the first liquid storage module so that at least a portion of the liquid in the heating water tank can enter the first liquid storage module.

[0006] According to any of the foregoing embodiments of the first aspect of the present invention, the closed-loop pressurized hot water system further includes: a water supply pipeline for supplying water to the heating unit and / or the heat storage unit; and a control component for controlling whether the water supply pipeline supplies liquid to the heating unit.

[0007] According to any of the foregoing embodiments of the first aspect of the present invention, the time-sharing temperature and frequency control method of the closed pressurized hot water system further includes: during off-peak electricity periods, controlling the operating frequency of the heat pump host according to the ambient temperature and a second heat pump frequency control model to supplement the heat storage unit, wherein the second heat pump frequency control model includes: when T > t1, controlling the heat pump host to operate within a first frequency range; when t1 > T > t2, controlling the heat pump host to operate within a first frequency range; and when T < t2, controlling the operating frequency of the heat pump host using a preset heat pump frequency control method.

[0008] According to any of the foregoing embodiments of the first aspect of the present invention, the step of controlling the operating frequency of the heat pump host in a preset heat pump frequency control mode when T < t2 includes: obtaining the temperature T of the liquid in the heating water tank. a The temperature T of the liquid in the first liquid storage module b The temperature T of the liquid in the second liquid storage module c The temperature T of the liquid in the third liquid storage module d When T c When t > t3, the heat pump unit remains in a non-starting state; when t4 < T c When T ≤ t3, the heat pump unit is controlled to operate within the first frequency range; when T c ≤t4 and T b When T > t0, the heat pump unit is controlled to operate in the second frequency range; when T b When t0 < t3, the heat pump unit is controlled to operate in the third frequency range, where t3 is the third preset temperature, t4 is the fourth preset temperature, and t0 > t3 > t4.

[0009] According to any of the foregoing embodiments of the first aspect of the present invention, the step of controlling the operating frequency of the heat pump host in a preset heat pump frequency control mode when T < t2 further includes: when the heat pump host operates in the first frequency range, until T d >t0, keep the heat pump unit in a non-start state; when the heat pump unit is operating in the second frequency range, until T c >t4, control the heat pump unit to operate in the first frequency range; when the heat pump unit operates in the third frequency range, until T b >t0 and T a When the frequency is greater than t0, the heat pump host is controlled to operate in the second frequency range.

[0010] According to any of the foregoing embodiments of the first aspect of the present invention, the heating water tank is provided with a heating assembly for heating the liquid in the heating water tank.

[0011] According to any of the foregoing embodiments of the first aspect of the present invention, the step of controlling the operating frequency of the heat pump host in a preset heat pump frequency control mode when T < t2 further includes: when T b <t0 and T a When T > t0, control the heat pump unit to operate at the third frequency; when T b <t0 and T a When T < t0, the heating component is turned on, and the heat pump unit is simultaneously controlled to operate at the third frequency; when T b >t0 and T a When T > t0, the heating component is shut off, and the heat pump unit is simultaneously controlled to operate at the second frequency; when T c >t4 after which the heat pump unit is controlled to operate at the first frequency; when T d When the temperature exceeds t0, the heat pump unit is turned off.

[0012] According to any of the foregoing embodiments of the first aspect of the present invention, the target temperature includes a user-set target temperature and a unit-set maximum temperature; during off-peak hours, the operating frequency of the heat pump host is controlled according to the ambient temperature and a first heat pump frequency control model to store heat in the heat storage unit until the liquid in the heat storage unit is heated to the unit-set maximum temperature; during non-off-peak hours, the operating frequency of the heat pump host is controlled according to the ambient temperature and a second heat pump frequency control model to supplement heat in the heat storage unit until the liquid in the heat storage unit is supplemented to the user-set target temperature.

[0013] Secondly, embodiments of the present invention provide a hot water system control device, the hot water system control device comprising: a memory and at least one processor, the memory storing instructions; the at least one processor calling the instructions in the memory to cause the hot water system control device to execute the time-sharing temperature and frequency control method for a closed pressurized hot water system as described in any of the foregoing embodiments of the first aspect of the present invention.

[0014] Thirdly, embodiments of the present invention provide a computer-readable storage medium storing instructions that, when executed by a processor, implement the time-sharing temperature and frequency control method for a closed-loop pressurized hot water system as described in any of the foregoing embodiments of the first aspect of the present invention.

[0015] The time-sharing temperature and frequency control method for a closed-loop pressurized hot water system according to an embodiment of the present invention acquires the current ambient temperature and controls the operating frequency of the heat pump unit in the heating unit based on the ambient temperature and a first heat pump frequency control model during off-peak electricity periods to store heat in the heat storage unit until the liquid in the heat storage unit reaches the target temperature. This time-sharing temperature and frequency control method for a closed-loop pressurized hot water system reduces the operation of the closed-loop pressurized hot water system during off-peak and peak electricity periods by controlling temperature and frequency during different time periods for heat storage. This effectively alleviates the electricity pressure during peak electricity periods, reduces the operating cost of the closed-loop pressurized hot water system, saves electricity bills, and is highly economical. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a closed-loop pressurized hot water system according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of a time-sharing temperature and frequency control method for a closed-loop pressurized hot water system according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of a hot water system control device according to an embodiment of the present invention.

[0020] Explanation of icon numbers:

[0021] 100-Heating unit; 110-Heat pump main unit; 120-Heating water tank; 121-First temperature sensor; 122-Heating component; 130-Control component; 200-Heat storage unit; 210-First liquid storage module; 211-Second temperature sensor; 220-Second liquid storage module; 221-Third temperature sensor; 230-Third liquid storage module; 231-Fourth temperature sensor; 300-Water supply pipeline; 400-Water return pipeline; 410-Connection section; 500-Water supply pipeline; 600-Hot water system control equipment; 610-Processor; 620-Memory; 630-Storage medium; 631-Operating system; 632-Data; 633-Application program; 640-Power supply; 650-Wired or wireless network interface; 660-Input / output interface.

[0022] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0025] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, the user should consider such a combination of technical solutions to be non-existent and not within the scope of protection claimed by this invention.

[0026] This invention provides a time-sharing temperature and frequency control method for a closed-loop pressurized hot water system. The closed-loop pressurized hot water system includes a heating unit and a heat storage unit. The heating unit includes a heat pump unit for heating liquid. The time-sharing temperature and frequency control method of this embodiment includes: acquiring the current ambient temperature; during off-peak electricity periods, controlling the operating frequency of the heat pump unit according to the ambient temperature and a first heat pump frequency control model to store heat in the heat storage unit until the liquid in the heat storage unit reaches the target temperature. The first heat pump frequency control model includes: when T > t1, controlling the heat pump unit to operate in a first frequency range; when t1 > T > t2, controlling the heat pump unit to operate in a second frequency range; when T < t2, controlling the heat pump unit to operate in a third frequency range, where T is the ambient temperature, t0 is the target temperature, t1 is the first preset temperature, t2 is the second preset temperature, t0 > t1 > t2, the third frequency range is higher than the second frequency range, and the second frequency range is higher than the first frequency range.

[0027] like Figure 1 As shown, Figure 1 This is a schematic diagram of a closed-loop pressurized hot water system according to an embodiment of the present invention. The closed-loop pressurized hot water system of this embodiment includes a heating unit 100 and a heat storage unit 200. The heating unit 100 includes a heat pump host 110 for heating liquid and a heating water tank 120. The heat storage unit 200 includes a first liquid storage module 210, a second liquid storage module 220, and a third liquid storage module 230 connected in series. The first liquid storage module 210 and the third liquid storage module 230 are respectively disposed at the beginning and end of the heat storage unit 200. The heat pump host 110 can transport the heated liquid to the heating water tank 120. The heating water tank 120 is connected to the first liquid storage module 210 through a connecting pipe, so that at least a portion of the liquid in the heating water tank 120 can enter the first liquid storage module 210. The hot water system of this application adopts a closed-loop pressurized hot water system, which can reduce water temperature fluctuations and improve user comfort compared to traditional open hot water systems.

[0028] Further, see Figure 2 , Figure 2This invention illustrates a time-sharing temperature and frequency control method for a closed-loop pressurized hot water system according to an embodiment of the present invention. The method includes: acquiring the current ambient temperature; during off-peak hours, controlling the operating frequency of the heat pump host 110 based on the ambient temperature and a first heat pump frequency control model to store heat in the heat storage unit 200 until the liquid in the heat storage unit 200 reaches the target temperature; and during non-off-peak hours, controlling the operating frequency of the heat pump host 110 based on the ambient temperature and a second heat pump frequency control model to supplement heat to the heat storage unit 200. It is understood that off-peak hours may vary in different regions, and those skilled in the art can flexibly adjust the time-sharing temperature and frequency control method of this embodiment for the closed-loop pressurized hot water system according to the peak and off-peak electricity pricing policies of their region.

[0029] Specifically, the first heat pump frequency control model includes: when T > t1, controlling the heat pump host 110 to operate in a first frequency range; when t1 > T > t2, controlling the heat pump host 110 to operate in a second frequency range; and when T < t2, controlling the heat pump host 110 to operate in a third frequency range, where T is the ambient temperature, t0 is the target temperature, t1 is the first preset temperature, t2 is the second preset temperature, t0 > t1 > t2, the third frequency range is higher than the second frequency range, and the second frequency range is higher than the first frequency range. Those skilled in the art can flexibly adjust the numerical ranges of the heat pump host 110 in the three frequency ranges. As an example, and not a limitation, the first frequency range is 30 to 60 Hz, the second frequency range is 60 to 90 Hz, and the third frequency range is 90 to 110 Hz.

[0030] As an example, and not a limitation, in some alternative implementations, during off-peak electricity periods, the target temperature t0 is the unit's set maximum temperature, i.e., the maximum temperature achievable by the closed-loop pressurized hot water system. The unit's set maximum temperature, the first preset temperature, and the second preset temperature are described below as specific values ​​for illustrative purposes. The target temperature t0 is the unit's set maximum temperature of 60°C, the first preset temperature t1 is 20°C, and the second preset temperature t2 is 0°C. In summer, when the ambient temperature T is greater than 20°C, during off-peak electricity periods, the heat pump unit 110 is controlled to operate within a first frequency range to store heat in the heat storage unit 200 until the liquid in the heat storage unit 200 reaches a temperature of 60°C. In spring and autumn, when the ambient temperature T is greater than 0°C and less than 20°C, the heat pump unit 110 is controlled to operate within a second frequency range to store heat in the heat storage unit 200 until the liquid in the heat storage unit 200 reaches a temperature of 60°C. In winter, when the ambient temperature T is less than 20℃, the heat pump unit 110 is controlled to operate within the second frequency range to store heat in the heat storage unit 200 until the liquid in the heat storage unit 200 reaches 60℃. It should be noted that t1 and t2 are interval control parameters set based on t0. With seasonal changes, the heat demand of customers in the closed-loop pressurized hot water system does not match the heat output of the unit, making it impossible to maximize energy efficiency under partial half-load operation. The time-sharing temperature and frequency control method for the closed-loop pressurized hot water system in this application embodiment can adjust the operating frequency of the variable frequency heat pump unit 110 according to the ambient temperature during off-peak hours, thereby controlling the hot water system through frequency control and maximizing energy efficiency.

[0031] Furthermore, the closed-loop pressurized hot water system also includes a water supply pipe 300 and a control component 130. The water supply pipe 300 is used to supply water to the heating unit 100 and / or the heat storage unit 200; the control component 130 is used to control whether the water supply pipe 300 supplies liquid to the heating unit 100. In this embodiment, the closed-loop pressurized hot water system can supply cold water to the end of the heat storage unit 200 through the water supply pipe 300, achieving separation of hot and cold water without affecting the hot water supply temperature. Compared to traditional hot water systems, it eliminates the need for immediate heating, enabling subsequent refined control.

[0032] Specifically, during off-peak electricity hours, the time-sharing temperature and frequency control method of the closed-loop pressurized hot water system can control the operating frequency of the heat pump host 110 to supplement the heat storage unit 200 based on the ambient temperature and the second heat pump frequency control model. The second heat pump frequency control model includes: when T > t1, controlling the heat pump host 110 to operate within a first frequency range; when t1 > T > t2, controlling the heat pump host 110 to operate within the first frequency range; and when T < t2, controlling the operating frequency of the heat pump host 110 using a preset heat pump frequency control method.

[0033] Furthermore, the target temperature includes the user-set target temperature and the unit's set maximum temperature. During off-peak hours, the operating frequency of the heat pump host 110 is controlled according to the ambient temperature and the first heat pump frequency control model to store heat in the heat storage unit 200 until the liquid in the heat storage unit 200 reaches the unit's set maximum temperature. The unit's set maximum temperature is the maximum target temperature that the closed-loop pressurized hot water system can achieve for heating. For example, 60℃, 80℃, etc., will not be listed here. During non-off-peak hours, the operating frequency of the heat pump host 110 is controlled according to the ambient temperature and the second heat pump frequency control model to supplement heat in the heat storage unit 200 until the liquid in the heat storage unit 200 is supplemented to the user-set target temperature. The user-set target temperature is the user-defined required temperature, and the specific value is flexibly set by the user, such as 50℃, 45℃, etc., will not be listed here.

[0034] To clearly describe this implementation, the user-set target temperature, first preset temperature, and second preset temperature are selected as specific values ​​for example description to facilitate understanding. The user-set target temperature t0 is 50°C, the first preset temperature t1 is 20°C, and the second preset temperature t2 is 0°C. In summer, when the ambient temperature T is greater than 20°C, during off-peak hours, the heat pump host 110 is controlled to operate within the first frequency range to supplement the heat storage unit 200 until the liquid in the heat storage unit 200 is heated to 50°C. In spring and autumn, when the ambient temperature T is greater than 0°C and less than 20°C, the heat pump host 110 is controlled to operate within the first frequency range to supplement the heat storage unit 200 until the liquid in the heat storage unit 200 is heated to 50°C. In winter, when the ambient temperature T is less than 20°C, the operating frequency of the heat pump host 110 is controlled using a preset heat pump frequency control mode to supplement the heat storage unit 200 until the liquid in the heat storage unit 200 is heated to 50°C.

[0035] Specifically, when T < t2, controlling the operating frequency of the heat pump host 110 using a preset heat pump frequency control method includes: obtaining the temperature T of the liquid in the heating water tank 120. a The temperature T of the liquid in the first liquid storage module 210 b The temperature T of the liquid in the second liquid storage module 220 c The temperature T of the liquid in the third liquid storage module 230 d In some alternative embodiments, the temperature T of the liquid inside the heating water tank 120 is obtained. a The temperature T of the liquid in the first liquid storage module 210 b The temperature T of the liquid in the second liquid storage module 220 c The temperature T of the liquid in the third liquid storage module 230 d The method is as follows: A first temperature sensor 121 is installed at the upper part of the heating water tank 120 to obtain the temperature T of the liquid in the heating water tank 120.a A second temperature sensor 211 is installed on the upper part of the first liquid storage module 210 to obtain the temperature T of the liquid inside the first liquid storage module 210. b A third temperature sensor 221 is installed in the middle of the second liquid storage module 220 to obtain the temperature T of the liquid inside the second liquid storage module 220. c A fourth temperature sensor 231 is installed at the lower part of the third liquid storage module 230 to obtain the temperature T of the liquid inside the third liquid storage module 230. d .

[0036] When T c When t > t3, this is a low-demand water zone, and the closed-loop pressurized hot water system is maintained at a constant temperature during the shutdown phase, keeping the heat pump unit 110 in a non-starting state; when t4 < T c When T ≤ t3, this is still a low-demand water zone, but user water consumption has increased slightly. The closed-loop pressurized hot water system is controlled in a low-frequency supplementary heating phase; specifically, the heat pump unit 110 is controlled to operate within the first frequency range. When T c ≤t4 and T b When T > t0, the user's water demand begins to gradually increase, entering the water demand period, and the heat pump unit 110 is controlled to operate in the second frequency range; when T b When the water consumption is less than t0, the user's water consumption increases rapidly, which is the high water demand period. The heat pump unit 110 is then controlled to operate within a third frequency range, where t0 is the target temperature, t3 is the third preset temperature, and t4 is the fourth preset temperature (t0 > t3 > t4). Further, as an example and not a limitation, t3 and t4 are interval control parameters set based on t0, where t4 = t0 - X, t3 = t0 - Y, X ∈ (8, 12), and Y ∈ (3, 7). The time-sharing temperature and frequency control method for the closed-loop pressurized hot water system according to this embodiment can divide the demand area according to the user's water demand and adjust the frequency of the variable frequency heat pump unit 110. By controlling the frequency, the closed-loop pressurized hot water system can be controlled, achieving a more energy-efficient closed-loop pressurized hot water system.

[0037] Furthermore, when T < t2, controlling the operating frequency of the heat pump host 110 using a preset heat pump frequency control method also includes: when the heat pump host 110 operates in the first frequency range, until T d >t0, keep the heat pump unit 110 in the off state; when the heat pump unit 110 is operating in the second frequency range, until T c >t4, control the heat pump unit 110 to operate in the first frequency range; when the heat pump unit 110 operates in the third frequency range, until T b >t0 and T a When the frequency is greater than t0, the heat pump host 110 is controlled to operate in the second frequency range.

[0038] In some optional embodiments, the heating water tank 120 is provided with a heating component 122, which is used to heat the liquid inside the heating water tank 120. Further, according to this embodiment, when T < t2, controlling the operating frequency of the heat pump host 110 using a preset heat pump frequency control method further includes: when T... b <t0 and T a When T > t0, the heat pump unit 110 is controlled to operate at the third frequency; when T b <t0 and T a When <t0, the heating component 122 is turned on, and the heat pump unit 110 is simultaneously controlled to operate at the third frequency; when T b >t0 and T a When T > t0, the heating component 122 is turned off, and the heat pump unit 110 is operated at the second frequency; when T c >t4 after which the heat pump host 110 is controlled to operate at the first frequency; when T d When the temperature exceeds t0, the heat pump unit 110 remains in a non-started state. This application achieves this by installing a heating component 122, which, at time T... b When the temperature is less than t0, the liquid is heated by the heat pump host 110 and the heating component 122 together to achieve rapid temperature rise.

[0039] Furthermore, the control component 130's control of whether the water supply line 300 supplies liquid to the heating unit 100 also includes: when T b <t0 and T a When the temperature is less than t0, the control component 130 controls the water supply pipe 300 to stop supplying liquid to the heating unit 100 until T... a When T > t0, the control component 130 controls the water supply pipe 300 to supply liquid to the heating unit 100. When T b <t0 and T a When the water demand period is less than t0, the water supply pipeline 300 stops supplying liquid to the heating unit 100 according to this embodiment. At the same time, the heat pump host 110 and the heating component 122 operate simultaneously, which can quickly heat the liquid, so that users can use hot water in a short time during peak water demand periods, providing users with a long-term and stable hot water supply.

[0040] Furthermore, the closed-loop pressurized hot water system also includes a water supply pipeline 500, a first liquid storage module 210 connected to a heating water tank 120 via a connecting pipeline, a water supply pipeline 500 connected to the connecting pipeline, and a water supply pipeline 500 connected to the outside for supplying water to customers; when T c When t > t3, the thermal storage unit 200 supplies liquid to the water supply pipeline 500; when t4 < T c When T ≤ t3, heating unit 100 supplies liquid to water supply pipe 500; when T c ≤t4 and T bWhen T > t0, heating unit 100 supplies liquid to water supply pipe 500; when T b <t0 and T a When T > t0, heating unit 100 supplies liquid to water supply pipe 500; when T b <t0 and T a When <t0, with the heating component 122 turned on and the heat pump unit 110 operating at the third frequency, the heat storage unit 200 supplies liquid to the water supply pipeline 500; when T b >t0 and T a When the temperature exceeds t0, the heating unit 100 supplies liquid to the water supply pipeline 500. In this embodiment, the water supply pipeline 500 is connected to the connecting pipeline, which can reduce the number of valves, simplify the system control method, and save costs.

[0041] In some optional embodiments, the closed-loop pressurized hot water system of this application further includes a return water pipe 400, which is connected to the replenishment water pipe 300 at a junction 410. The return water pipe 400 can be used to supply water to the heating unit 100 and / or the heat storage unit 200. Furthermore, the return water pipe 400 is equipped with a return water pump and a one-way valve. The one-way valve is located between the return water pump and the junction 410 and is used to control the unidirectional flow of liquid from the return water pump to the junction 410. The replenishment water pipe 300 is connected to the tap water supply. When a user draws hot water from the heating tank 120 and / or the heat storage unit 200 of the closed-loop pressurized hot water system, water needs to be replenished to the heating tank 120 or the heat storage unit 200. The return water pump is turned on when the user requests it, and after being turned on, it mixes with the tap water and is divided into two streams entering the heat storage unit 200 and the heating unit 100. The return water pipe 400 can recycle unused hot water from the user end to the closed pressurized hot water system of this application embodiment, which is energy-saving and environmentally friendly.

[0042] The closed-loop pressurized hot water system according to an embodiment of the present invention has two operating modes. The first operating mode is an energy-saving mode, which acquires the ambient temperature and, during off-peak hours, controls the operating frequency of the heat pump host 110 to store heat in the heat storage unit 200 based on the ambient temperature and a first heat pump frequency control model, until the liquid in the heat storage unit 200 has reached the target temperature. During non-off-peak hours, the operating frequency of the heat pump host 110 is controlled based on the ambient temperature and a second heat pump frequency control model to supplement heat to the heat storage unit 200. This mode enables time-segmented temperature and frequency control for heat storage, reducing the operation of the closed-loop pressurized hot water system during off-peak and peak electricity periods, saving electricity costs, and is highly economical.

[0043] The second operating mode is the high-efficiency mode, which can control the operating frequency of the heat pump host 110 according to a preset heat pump frequency control method, and obtain the temperature T of the liquid in the heating water tank 120. a The temperature T of the liquid in the first liquid storage module 210 bThe temperature T of the liquid in the second liquid storage module 220 c The temperature T of the liquid in the third liquid storage module 230 d The operating frequency of the heat pump host 110 is controlled according to the third and fourth preset temperatures. By dividing the heat storage unit 200 into three demand zones, the current user demand is determined by the temperature of each liquid storage module, and the frequency of the heat pump host 110 is adjusted according to the user demand. This achieves frequency control for the closed pressurized hot water system, reducing the frequent start-stop of the heat pump host 110 and avoiding the problems of slow water temperature rise and low system operating efficiency, thus achieving environmental protection and energy saving.

[0044] This invention also provides a hot water system control device, comprising: a memory and at least one processor, wherein the memory stores instructions; the at least one processor invokes the instructions in the memory to cause the hot water system control device to execute the time-sharing temperature and frequency control method for a closed-loop pressurized hot water system as described in the above embodiments. According to this embodiment, the hot water system control device controls a closed-loop pressurized hot water system, enabling it to achieve high-frequency, high-temperature hot water energy storage during off-peak hours and low-frequency supplementary heating during normal and peak hours, based on actual peak and off-peak electricity prices, thus achieving optimal energy storage and energy saving, saving electricity costs for users, and responding to national electricity policies.

[0045] Specifically, such as Figure 3 As shown, Figure 3 This is a schematic diagram of a hot water system control device 600 provided in an embodiment of the present invention. The hot water system control device 600 can vary significantly due to different configurations or performance characteristics. It may include one or more central processing units (CPUs) 610 (e.g., more than one processor) and a memory 620, and one or more storage media 630 (e.g., one or more mass storage devices) storing application programs 633 or data 632. The memory 620 and storage media 630 can be temporary or persistent storage. The program stored in the storage media 630 may include one or more modules (not shown in the diagram), each module including a series of instruction operations on the hot water system control device 600. Furthermore, the processor 610 may be configured to communicate with the storage media 630 and execute the series of instruction operations in the storage media 630 on the hot water system control device 600.

[0046] The hot water system control device 600 may also include one or more power supplies 640, one or more wired or wireless network interfaces 650, one or more input / output interfaces 660, and / or one or more operating systems 631, such as Windows Server, MacOS X, Unix, Linux, FreeBSD, etc. Those skilled in the art will understand that... Figure 3The illustrated hot water system control device structure does not constitute a limitation on the hot water system control device, and may include more or fewer components than illustrated, or combine certain components, or have different component arrangements.

[0047] The present invention also provides a computer-readable storage medium, which can be a non-volatile computer-readable storage medium or a volatile computer-readable storage medium, wherein the computer-readable storage medium stores instructions that, when the instructions are executed on a computer, cause the computer to perform the steps of the time-sharing temperature and frequency control method for the closed pressurized hot water system described in the above embodiments.

[0048] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the closed pressurized hot water system and the hot water system control equipment described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0049] If the time-sharing temperature and frequency control method for the integrated closed-loop pressurized hot water system is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the time-sharing temperature and frequency control method for the closed-loop pressurized hot water system described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0050] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A time-sharing temperature and frequency control method for a closed-loop pressurized hot water system, characterized in that, The closed-loop pressurized hot water system includes a heating unit and a heat storage unit comprising a first liquid storage module, a second liquid storage module, and a third liquid storage module connected in series. The heating unit includes a heat pump unit for heating the liquid and a heating water tank. The heating water tank is equipped with a heating component for heating the liquid inside the heating water tank. The time-sharing temperature and frequency control method of the closed-loop pressurized hot water system includes: Get the current ambient temperature; During off-peak electricity hours, the operating frequency of the heat pump host is controlled according to the ambient temperature and the first heat pump frequency control model to store heat in the heat storage unit until the liquid in the heat storage unit reaches the target temperature. The first heat pump frequency control model includes: When T > t1, the heat pump unit is controlled to operate within the first frequency range; When t1 > T > t2, the heat pump unit is controlled to operate in the second frequency range; When T < t2, the heat pump unit is controlled to operate in the third frequency range. Where T is the ambient temperature, t0 is the target temperature, t1 is the first preset temperature, t2 is the second preset temperature, t0 > t1 > t2, the third frequency range is higher than the second frequency range, and the second frequency range is higher than the first frequency range; During off-peak electricity hours, the operating frequency of the heat pump unit is controlled according to the ambient temperature and the second heat pump frequency control model to supplement the heat storage unit. The second heat pump frequency control model includes: when T < t2, controlling the operating frequency of the heat pump unit using a preset heat pump frequency control method; wherein, when T < t2, controlling the operating frequency of the heat pump unit using the preset heat pump frequency control method includes: obtaining the temperature T of the liquid in the heating water tank. a The temperature T of the liquid in the first liquid storage module b The temperature T of the liquid in the second liquid storage module c The temperature T of the liquid in the third liquid storage module d When T c When t > t3, the heat pump unit remains in a non-starting state; when t4 < T c When T ≤ t3, the heat pump unit is controlled to operate within the first frequency range; when T c ≤t4 and T b When T > t0, the heat pump unit is controlled to operate in the second frequency range; when T b When t0 < t3, the heat pump unit is controlled to operate in the third frequency range, where t3 is the third preset temperature, t4 is the fourth preset temperature, and t0 > t3 > t4.

2. The time-sharing temperature and frequency control method for a closed-loop pressurized hot water system as described in claim 1, characterized in that, The thermal storage unit includes a first liquid storage module, a second liquid storage module, and a third liquid storage module connected in series. The first liquid storage module and the third liquid storage module are respectively disposed at the beginning and end of the thermal storage unit. The heat pump unit can deliver heated liquid to the heating water tank, which is connected to the first liquid storage module so that at least a portion of the liquid in the heating water tank can enter the first liquid storage module.

3. The time-sharing temperature and frequency control method for a closed-loop pressurized hot water system as described in claim 2, characterized in that, The closed-loop pressurized hot water system also includes: Water supply pipes are used to supply water to the heating unit and / or the heat storage unit; and A control component is used to control whether the water supply pipeline provides liquid to the heating unit.

4. The time-sharing temperature and frequency control method for a closed-loop pressurized hot water system as described in claim 3, characterized in that, The second heat pump frequency control model also includes: When T > t1, the heat pump unit is controlled to operate within the first frequency range; When t1 > T > t2, the heat pump unit is controlled to operate within the first frequency range.

5. The time-sharing temperature and frequency control method for a closed-loop pressurized hot water system as described in claim 4, characterized in that, The step of controlling the operating frequency of the heat pump host in a preset heat pump frequency control mode when T < t2 further includes: When the heat pump unit operates in the first frequency range, until T d >t0, keep the heat pump unit in a non-starting state; When the heat pump unit operates in the second frequency range, until T c >t4, control the heat pump unit to operate within the first frequency range; When the heat pump unit operates in the third frequency range, until T b >t0 and T a When the frequency is greater than t0, the heat pump host is controlled to operate in the second frequency range.

6. The time-sharing temperature and frequency control method for a closed-loop pressurized hot water system as described in claim 5, characterized in that, The step of controlling the operating frequency of the heat pump host in a preset heat pump frequency control mode when T < t2 further includes: When T b <t0 and T a When the temperature exceeds t0, control the heat pump unit to operate at the third frequency; When T b <t0 and T a When <t0, control the heating component to turn on, and simultaneously control the heat pump host to operate at the third frequency; When T b >t0 and T a When T > t0, the heating component is shut off, and the heat pump unit is simultaneously controlled to operate at the second frequency; when T c >t4 after which the heat pump unit is controlled to operate at the first frequency; when T d When the temperature exceeds t0, the heat pump unit is turned off.

7. The time-sharing temperature and frequency control method for a closed-loop pressurized hot water system as described in claim 4, characterized in that, The target temperature includes the user-set target temperature and the unit's set maximum temperature; During off-peak hours, the operating frequency of the heat pump host is controlled according to the ambient temperature and the first heat pump frequency control model to store heat in the heat storage unit until the liquid in the heat storage unit stores heat to the maximum temperature set by the unit. During off-peak electricity hours, the operating frequency of the heat pump host is controlled according to the ambient temperature and the second heat pump frequency control model to supplement the heat storage unit until the liquid in the heat storage unit is heated to the user-set target temperature.

8. A hot water system control device, characterized in that, The hot water system control device includes: a memory and at least one processor, wherein the memory stores instructions; the at least one processor invokes the instructions in the memory to cause the hot water system control device to execute the time-sharing temperature and frequency control method for a closed pressurized hot water system as described in any one of claims 1-7.

9. A computer-readable storage medium storing instructions thereon, characterized in that, When the instruction is executed by the processor, it implements the time-sharing temperature and frequency control method for a closed pressurized hot water system as described in any one of claims 1-7.

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