Distributed end cycle hot water system using waste heat resources and control method

Abstract

The application relates to a distributed end cycle hot water system using waste heat resources and a control method, which comprises a centralized waste heat resource recovery side module and a distributed demand side module; the centralized waste heat resource module comprises a waste heat resource water cycle, a heat exchange water cycle and a water supply flow path which are sequentially connected in heat exchange mode; and the distributed demand side module comprises a plurality of independent demand side modules. Compared with the prior art, on the basis of using a water source heat pump to utilize waste heat, the application cancels a large water tank arranged on the side of the traditional water source heat pump, disassembles the water tank into distributed water tanks which are dispersed to the demand side of users, disassembles the water tank capacity matched with the user side load into double water tanks, combines an air source heat pump to realize cycle hot water, avoids waste of water resources, realizes the functions of water temperature regulation, peak-shaving storage and full-period hot water supply, connects a plurality of demand side modules with the waste heat resources, and realizes full utilization of the waste heat resources.

Description

Technical Field

[0001] This invention relates to the field of centralized waste heat recovery technology, and also to a hot water system and its control method, particularly to a distributed terminal circulating hot water system utilizing waste heat resources and its control method. Background Technology

[0002] Many industrial parks have centralized waste heat resources, such as air compressor stations that use compressed air as a power source for industrial production. During operation, these stations generate a significant amount of waste heat, which is typically transported to cooling towers via cooling water and released into the environment, resulting in a substantial waste of reusable energy. Waste heat recovery is a crucial measure for energy conservation and emission reduction. By recovering waste heat from air compressor stations to produce hot water, this waste heat can be converted into usable energy, improving energy efficiency. This helps reduce energy waste and thus carbon emissions. Utilizing waste heat from air compressor stations to produce hot water reduces the demand for other energy sources, thereby reducing the consumption of traditional energy. Traditionally, businesses need to purchase additional energy to meet their hot water needs, but recovering waste heat reduces this energy consumption. By reducing the demand for traditional energy, greenhouse gas emissions can be reduced, promoting carbon reduction and environmental protection. Utilizing waste heat from air compressor stations to produce hot water reduces energy costs for businesses. Recovering waste heat not only reduces the demand for other energy sources but also reduces energy procurement and transportation costs. This helps improve the economic efficiency of businesses, reduce production costs, and enhance their competitiveness. It is evident that the promotion and research and development of waste heat recovery technology is of great importance. However, the commonly used recovery method is to directly exchange high-temperature waste heat resources such as steam or condensate through heat exchangers to produce domestic hot water. Due to the limitations of heat energy extraction technology, this direct heat exchange method is often inefficient.

[0003] Heat pump technology absorbs waste heat in the evaporator using refrigerant, and uses a compressor to compress the refrigerant into high-temperature, high-pressure vapor, which then releases heat as it flows through the condenser. Currently, heat pump technology is relatively mature, allowing for the extraction of more heat with higher energy efficiency. Its environmental friendliness and high efficiency have made it a popular choice for hot water systems. Therefore, depending on the form of waste heat resources, matching heat pump technology can be used to recover waste heat and produce domestic hot water.

[0004] Waste heat recovery resources often come from industrial parks, and the corresponding hot water systems typically employ centralized heating followed by zoned hot water distribution. These systems are equipped with medium to large-sized hot water storage tanks. After being heated by the heating system, the hot water is sent to the storage tanks, forming a central hot water supply station. From there, the hot water is distributed to various users through various hot water pipes. However, the storage tanks suffer from problems such as mixing losses and the direct discharge of excess water, which leads to waste.

[0005] Existing waste heat recovery and hot water production systems in industrial parks have the following problems: First, most industrial parks directly heat waste heat resources to produce hot water through heat exchangers, which has low utilization efficiency. For example, patent CN 112145429A discloses a waste heat recovery system for air compressors, which increases the contact time between water and heat by modifying the heat exchanger structure to increase waste heat turbulence and water flow, thereby improving conversion efficiency. However, this method does not consider heat loss during long-distance hot water transmission and has a lower heat exchange capacity compared to heat pump systems. Second, some industrial parks use heat pump technology to increase energy efficiency but do not consider the problem of intermittent supply of waste heat resources, as illustrated by patent CN 110762898. A disclosed waste heat recovery system for an air compressor station based on a water source heat pump unit absorbs waste heat to produce hot water. However, it does not consider the problem of intermittent heating when the air compressor unit is shut down, i.e., when the heat pump lacks cooling water as a heat source. Third, due to the instability of waste heat resources, some systems are equipped with water tanks to store hot water, but the water tanks are only used for peak storage and their other potential, such as water recycling and reuse, is not explored. In addition, the water source heat pump side is equipped with a large hot water storage tank, which has the problem of space requirements. At the same time, when there is excess water in the tank, it is often directly discharged, resulting in waste. For example, the dual-source dual-water-tank heat pump water supply system proposed in patent CN 211204209 U, although it adds a hot water storage tank to ensure stable heating when the main heat source is insufficient, has the problem of mixing water loss and does not consider the reuse of excess water. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology by providing a distributed terminal circulating hot water system and control method that utilizes waste heat resources. Based on the use of a water source heat pump to utilize waste heat, the large water tank traditionally equipped on the water source heat pump side is eliminated and the system is disassembled into distributed water tanks dispersed to the user demand side. The water tank capacity matched with the user side load is further disassembled into dual water tanks, which are combined with an air source heat pump to realize circulating hot water. This avoids water waste and realizes the functions of water temperature regulation, peak storage, and all-time hot water supply. The waste heat resources are connected to multiple demand-side modules to realize the full utilization of waste heat resources.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] The first aspect of this invention provides a distributed terminal circulating hot water system utilizing waste heat resources, comprising a centralized waste heat resource recovery module and a distributed demand-side module;

[0009] The centralized waste heat resource module includes a waste heat resource water circulation system, a hot water circulation system, and a water supply path that are connected in sequence for heat exchange.

[0010] The distributed demand-side module includes multiple independent demand-side modules. Each demand-side module includes a primary water tank, an air source heat pump unit, a secondary water tank, and a user terminal connected in sequence. The primary water tank is connected to the water supply path.

[0011] Furthermore, the waste heat resource water circulation includes a heat dissipation water flow path of the air compressor unit and a first heat exchange channel of the plate heat exchanger;

[0012] The hot water circulation includes a second heat exchange channel of a plate heat exchanger, a first heat exchange channel of a water source heat pump unit, and a circulating water pump connected in sequence. The circulating water pump is connected to the second heat exchange channel of the plate heat exchanger to form a circulation.

[0013] The water supply path includes a chilled water pump and a second heat exchange channel of a source heat pump unit connected in sequence.

[0014] Furthermore, the demand-side module includes a water supply valve, a primary water tank, a hot water valve 14, a heating water pump, an air source heat pump unit, a secondary water tank, a secondary water supply valve, a drainage pump, and a user terminal.

[0015] Furthermore, the demand-side module also includes a primary water supply valve, a return water valve, and a terminal water supply valve;

[0016] The primary water supply valve is located between the primary water tank and the drainage pump 21;

[0017] The return water valve is located between the primary water tank and the user end;

[0018] The end water supply valve 22 is connected to the user terminal.

[0019] Furthermore, the primary water tank is equipped with a primary temperature sensor and a primary liquid level sensor. When the liquid level and temperature meet the preset water delivery requirements, the primary water delivery valve opens, and the drain pump drives the water in the primary water tank to the user end. Excess water returns to the primary water tank through the return valve.

[0020] When the temperature does not meet the preset requirements, the hot water valve opens, and the water is sent to the air source heat pump unit for reheating and then sent to the secondary water tank.

[0021] The secondary water tank is equipped with a secondary temperature sensor and a secondary liquid level sensor. When the liquid level and temperature meet the water delivery requirements, the secondary water delivery valve opens, and the drainage pump drives the water in the secondary water tank to the user end. Excess water returns to the primary water tank through the return valve.

[0022] The user terminal is equipped with a terminal water supply valve and a terminal temperature sensor. By sensing the values ​​of the terminal temperature sensor, the primary temperature sensor, and the secondary temperature sensor, the terminal water supply valve, the primary water supply valve, and the secondary water supply valve can be adjusted to automatically regulate the water temperature.

[0023] The second invention provides a control method for a distributed terminal circulating hot water system utilizing waste heat resources as described above. Based on environmental and user needs, the distributed terminal circulating hot water system utilizing waste heat resources is adjusted to one of the following modes: water source heat pump heating and storage mode, water source heat pump heating and delivery mode, combined heat pump heating and storage mode, combined heat pump heating and delivery mode, air source heat pump heating and storage mode, air source heat pump heating and delivery mode, and storage and delivery mode.

[0024] Furthermore, in the water source heat pump heating and water storage mode: the circulating water pump drives the circulating water to the plate heat exchanger to absorb the waste heat from the centralized waste heat resources, and then enters the evaporator of the water source heat pump to dissipate heat. The cold water is heated by the condenser driven by the cold water pump. The water supply valve is opened, and the hot water enters the primary water tank to complete the primary water storage. At the same time, the hot water valve is opened, the heating water pump is started, and the air source heat pump unit is turned off. The hot water in the primary water tank is driven by the heating water pump and enters the secondary water tank through the hot water valve. Both water tanks store water at the same time. When the secondary liquid level detector detects that the liquid level has reached the set storage liquid level of the secondary water tank, the hot water valve and the heating water pump are closed. When the primary liquid level detector detects that the liquid level has reached the set storage liquid level of the primary water tank, the water supply valve is closed. The water source heat pump unit continues to supply hot water to other demand-side modules or stops. The primary water supply valve, the secondary water supply valve, the return water valve, the terminal water supply valve, and the drain pump are normally closed.

[0025] In the water source heat pump heating and water delivery mode: the circulating water pump drives the circulating water to the plate heat exchanger to absorb the waste heat from the centralized waste heat resources, and then enters the evaporator of the water source heat pump to dissipate heat. The cold water is heated by the cold water pump through the condenser. The water supply valve opens, and hot water enters the primary water tank. The primary temperature sensor detects a temperature value higher than the user's set water temperature value, so the primary water supply valve opens and the return valve opens. The drain pump drives the water in the primary water tank to be delivered to the user. Excess water returns to the primary water tank through the return valve. According to the temperature value detected by the terminal temperature sensor, the terminal water supply valve and the primary water supply valve work together to adjust the opening degree to complete the water temperature and flow rate control.

[0026] In the combined heat pump heating and water storage mode: the circulating water pump drives the circulating water to the plate heat exchanger to absorb the waste heat from the centralized waste heat resources, and then enters the evaporator of the water source heat pump to dissipate heat. The cold water is heated by the cold water pump through the condenser. The water supply valve opens, and hot water enters the primary water tank. The primary water supply valve closes, the heating water pump and hot water valve open, and the air source heat pump unit starts. The heating water pump drives the hot water in the primary water tank to enter the condenser of the air source heat pump unit for reheating through the hot water valve. After being further heated, the hot water enters the secondary water tank. When the secondary liquid level sensor senses that the secondary water tank has reached the required level... Once the primary water tank level reaches the required level, the water supply valve closes, and the water source heat pump unit supplies hot water to other demand-side modules. The drain pump starts, the secondary water supply valve opens, and the return water valve opens. The hot water in the secondary water tank goes to the primary water tank through the secondary water supply valve and the return water valve, further heating the water in the primary water tank. Meanwhile, the water at the bottom of the primary water tank continues to be heated by the air source heat pump unit and sent to the secondary water tank. When the primary temperature sensor detects that the temperature of the primary water tank has risen to a stable level, the air source heat pump unit, drain pump, secondary water supply valve, and return water valve close.

[0027] In the combined heat pump heating and water supply mode: the circulating water pump drives the circulating water to the plate heat exchanger to absorb the waste heat from the centralized waste heat resources, and then enters the evaporator of the water source heat pump to dissipate heat. The cold water is heated to a certain temperature by the condenser driven by the cold water pump. The water supply valve opens, and the hot water enters the primary water tank. If the temperature value sensed by the primary temperature sensor is lower than the user's set water temperature value, the primary water supply valve closes, the heating water pump and hot water valve open, and the air source heat pump unit starts. The heating water pump drives the hot water in the primary water tank to enter the condenser of the air source heat pump unit for reheating through the hot water valve. The hot water is further heated before entering the condenser. In the secondary water tank, when the water temperature sensed by the secondary temperature sensor is higher than the user's set temperature, the secondary water supply valve and the return valve open. The drain pump drives the hot water in the secondary water tank to the user through the secondary water supply valve. Excess water returns to the primary water tank through the return valve. At this time, the temperature of the mixed water in the primary water tank will gradually rise. When the water temperature in the primary water tank meets the requirements, the primary water supply valve opens, and both water tanks supply water simultaneously. The water temperature is regulated by adjusting the opening of the two water supply valves. Based on the temperature value sensed by the terminal temperature sensor, the terminal water supply valve works in conjunction with the other water supply valves to control the water temperature and flow rate by adjusting the opening.

[0028] In the air source heat pump heating and water storage mode: With centralized waste heat resources providing no waste heat, the water source heat pump stops, the water supply valve opens, and cold water, driven by the cold water pump, enters the primary water tank through the water supply valve. The primary water supply valve closes, and the heating water pump and hot water valve open. The air source heat pump unit starts, and the heating water pump drives the water in the primary water tank through the hot water valve into the condenser of the air source heat pump unit to absorb heat. After being heated, the cold water enters the secondary water tank. When the secondary water level sensor detects that the secondary water tank has reached the required level, and the primary water level sensor detects that the primary water tank level has reached the required level, the water supply valve closes, the drain pump starts, the secondary water supply valve opens, and the return water valve opens. The hot water in the secondary water tank goes to the primary water tank through the secondary water supply valve and the return water valve, further heating the water in the primary water tank. Meanwhile, the water at the bottom of the primary water tank continues to be heated by the air source heat pump unit and sent to the secondary water tank. When the primary temperature sensor detects that the temperature of the primary water tank has risen to a stable level, the air source heat pump unit, drain pump, secondary water supply valve, and return water valve close.

[0029] In the air source heat pump heating and water supply mode: With no waste heat provided by centralized waste heat resources, the water source heat pump stops, the water supply valve opens, and cold water, driven by the cold water pump, enters the primary water tank through the water supply valve. The primary water supply valve closes, and the heating water pump and hot water valve open, starting the air source heat pump unit. The heating water pump drives the water from the primary water tank through the hot water valve into the condenser of the air source heat pump unit to absorb heat. After being heated, the cold water enters the secondary water tank. When the water temperature sensed by the secondary temperature sensor is higher than the user's set temperature, the secondary water supply valve and return valve open. The drain pump drives the hot water in the secondary water tank through the secondary water supply valve to the user. Excess water returns to the primary water tank through the return valve. At this time, the mixed water temperature in the primary water tank gradually increases. When the water temperature in the primary water tank meets the requirements, the primary water supply valve opens, and both water tanks supply water simultaneously. The water supply temperature is regulated by adjusting the opening of the two water supply valves. Based on the temperature value sensed by the terminal temperature sensor, the terminal water supply valve works in conjunction with the other water supply valves, adjusting the opening to control the water temperature and flow rate.

[0030] In the water storage and delivery mode: When the primary level sensor detects the presence of water in the primary water tank and the primary temperature sensor senses that the temperature in the primary water tank meets the requirements, the primary water delivery valve opens, and the drain pump drives the water to the user end. When the secondary level sensor detects the presence of water in the secondary water tank and the secondary temperature sensor senses that the temperature in the secondary water tank meets the requirements, the secondary water delivery valve opens, and the drain pump drives the water to the user end. Based on the temperature value sensed by the terminal temperature sensor, the terminal water supply valve works in coordination with the other water delivery valves to adjust the water temperature and flow rate through opening adjustment. When the primary level sensor detects the presence of water in the primary water tank, but the primary temperature sensor senses that the temperature in the primary water tank does not meet the requirements, or when the secondary level sensor detects the presence of water in the secondary water tank, but the secondary temperature sensor senses that the temperature in the secondary water tank does not meet the requirements, the air source heat pump water delivery mode is activated to heat the water before delivery.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. This invention utilizes a water source heat pump to distribute waste heat resources to multiple end-user demand sides, changing the traditional large hot water storage tank to a distributed dual-tank structure that matches the end load, thereby reducing the unit's footprint while maximizing the utilization of waste heat resources.

[0033] 2. This invention adopts a combined heat pump approach, adding an air source heat pump unit near the user end on the basis of a water source heat pump, which solves the problems of transmission loss and water temperature drop caused by intermittent supply of waste heat resources, and realizes the function of heating at all times.

[0034] 3. This invention achieves water temperature regulation, peak-shaving storage, and wastewater reheating through a series connection of a water tank, an air-source heat pump, and another water tank, combined with the control of various valves. By transmitting data from four sensors and coordinating the control of the supply valve, hot water valve, return valve, water supply valve, and end-point water supply valve, different system operation modes can be implemented. Each mode is selected according to actual conditions and local circumstances, maximizing the system's energy efficiency and intelligence.

[0035] 4. This invention provides energy-saving automatic regulation while enhancing user control over the system and expanding the applicability of the hot water system. In particular, regarding water temperature control, users can choose automatic adjustment via the terminal water supply valve for more precise temperature control and hot water delivery, or they can choose manual adjustment to reduce water supply. The same system can adjust the water temperature according to different needs such as handwashing, laundry, underfloor heating, and bathing. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of a distributed terminal circulating hot water system utilizing waste heat resources and its control method according to the present invention.

[0037] Figure 1 In the middle: 1. Cooling water pump, 2. Cooling tower, 3. Air compressor, 4. Plate heat exchanger, 5. Circulating water pump, 6. Cold water pump, 7. Water source heat pump unit, 8. Water supply valve, 9. Primary water tank, 10. Primary temperature sensor, 11. Primary liquid level sensor, 12. Return water valve, 13. Primary water supply valve, 14. Hot water valve, 15. Heating water pump, 16. Air source heat pump unit, 17. Secondary water tank, 18. Secondary temperature sensor, 19. Secondary liquid level sensor, 20. Secondary water supply valve, 21. Drain pump, 22. Cold water valve, 23. Terminal temperature sensor, 24. User end. Detailed Implementation

[0038] This invention relates to a distributed terminal circulating hot water system utilizing waste heat resources, comprising a centralized waste heat resource recovery module and a distributed demand-side module.

[0039] The waste heat resource generation methods of the waste heat resource recovery module include, but are not limited to, air compressor units: air compressors, cooling towers, and cooling water pumps.

[0040] In specific implementation, the waste heat recovery module includes a plate heat exchanger, a circulating water pump, a cold water pump, and a water source heat pump unit.

[0041] In practice, the cooling water pump drives the cooling water that absorbs heat from the air compressor into the plate heat exchanger, where it exchanges heat with the circulating water driven by the circulating water pump. The cooled water then returns to the air compressor, completing the cooling water circulation. The circulating water then enters the water source heat pump unit, where it releases heat in the evaporator and returns to the plate heat exchanger, completing the circulating water circulation. The cold water pump drives the cold water into the water source heat pump unit, where it is heated to a certain temperature in the condenser and then directly sent to the primary water tank in the distributed end-demand side module.

[0042] In specific implementation, the preferred method is to retain the original cooling water heat dissipation method. After the cooling water dissipates heat through the cooling tower, it returns to the air compressor unit. This ensures that the air compressor unit's cooling water can still be sent to the cooling tower for heat dissipation in the original way when the heat exchanger fails or the system is changed, so as to ensure the normal operation of the unit.

[0043] In specific implementation, preferably, the water source heat pump module can be selected from different specifications of units and multiple units can be connected in series or parallel, depending on actual needs.

[0044] In specific implementation, the end-demand side module includes a primary water tank, a secondary water tank, a heating water pump, a drainage pump, a heating valve, a primary water tank supply valve, a secondary water tank supply valve, a return water valve, a replenishment water valve, an end-cold water valve, and an air source heat pump unit.

[0045] In specific implementation, the primary water tank is equipped with a primary temperature sensor and a primary liquid level sensor. When the hot water delivered by the water source heat pump reaches the set liquid level, the water supply valve is closed. When the water temperature is higher than the set hot water temperature, the primary water tank supply valve is opened, and the water in the primary water tank is delivered to the user end through the action of the drain pump. The return valve is opened, and excess water is sent back to the primary water tank. When the water temperature is lower than the set hot water temperature, the primary water tank supply valve is closed, the heating valve is opened, and the water in the primary water tank is delivered to the air source heat pump unit for reheating through the action of the heating water pump.

[0046] In practice, the air source heat pump unit reheats the water supplied by the primary water tank and then sends it to the secondary water tank.

[0047] In specific implementation, preferably, the air source heat pump module can be selected from different specifications of units and multiple units can be connected in series or parallel, depending on actual needs.

[0048] In practice, the secondary water tank is equipped with a secondary temperature sensor and a secondary liquid level sensor. When the liquid level is detected to be higher than the set liquid level, the heating water pump and hot water valve are turned off. When the secondary water supply valve is opened, the water in the secondary water tank is sent to the user end through the drain pump, and the excess water is sent back to the primary water tank through the return water valve.

[0049] In specific implementation, a terminal temperature sensor is installed before the user end and after the terminal water supply valve. By comparing the set temperature value with the real-time data of the terminal temperature sensor, the first-level temperature sensor, and the second-level temperature sensor, the opening degree of the terminal water supply valve, the first-level water supply valve, and the second-level water supply valve can be adjusted according to different operating modes and actual needs to achieve water temperature regulation.

[0050] In specific implementation, preferably, the opening degree of the primary water supply valve and the secondary water supply valve in water temperature regulation is automatically adjusted, and the adjustment of the terminal water supply valve includes automatic adjustment or manual adjustment, thereby realizing the switching of multiple working modes.

[0051] In specific implementation, preferably, a terminal interface can be provided at the user end to realize functions such as control and monitoring of the hot water system.

[0052] In practical implementation, the waste heat recovery combined heat pump and dual-tank energy-saving hot water system is suitable for the centralized recycling of waste heat resources. The water source heat pump realizes the function of producing domestic hot water from waste heat resources, and the addition of an air source heat pump as an auxiliary unit ensures that hot water demand is met at all times. The elimination of the large water tank on the water source heat pump side and the replacement with a dual-tank system that matches the terminal load further enhances the energy-saving effects of water storage, water temperature regulation, and no water waste. Based on the data transmission of only three temperature sensors and two liquid level sensors, the adjustment of different water valves is realized, making the hot water system more intelligent, visible, multi-mode, energy-efficient, and the parallel distributed terminal ensures that waste heat resources can be fully utilized.

[0053] In specific implementation, the distributed terminal circulating hot water system utilizing waste heat resources includes a water source heat pump heating and storage mode, a water source heat pump heating and delivery mode, a combined heat pump heating and storage mode, a combined heat pump heating and delivery mode, an air source heat pump heating and storage mode, an air source heat pump heating and delivery mode, and a water storage and delivery mode.

[0054] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0055] Example 1

[0056] This embodiment describes a distributed terminal circulating hot water system utilizing waste heat resources. In this embodiment, a centralized waste heat resource is exemplified by an air compressor unit. Figure 1 As shown.

[0057] The centralized waste heat resource module includes a cooling water pump 1, a cooling tower 2, and an air compressor 3. When the waste heat resource dissipates heat in the original manner, the waste heat resource of the air compressor 3 is absorbed by the cooling water. Driven by the cooling water pump 1, the cooling water enters the cooling tower 2 to dissipate heat and then returns to the air compressor 3 to complete the cycle.

[0058] When waste heat is recovered, the waste heat is absorbed by the cooling water and driven by the cooling water pump 1. It then enters the plate heat exchanger 4 to exchange heat with the circulating water driven by the circulating water pump 5, and then returns to the air compressor 3.

[0059] The circulating water driven by the circulating water pump 5 absorbs waste heat resources through the plate heat exchanger 4 and then enters the evaporator of the water source heat pump unit 7 to dissipate heat. The cold water driven by the cold water pump 6 enters the condenser of the water source heat pump unit 7 to absorb heat, and the cold water is heated.

[0060] The cold water pump 6 drives the cold water to be heated in the water source heat pump unit 7, and then enters the primary water tank 9 through the water supply valve 8.

[0061] The primary water tank 9 is equipped with a primary temperature sensor 10 and a primary liquid level sensor 11. When the liquid level and temperature meet the water delivery requirements, the primary water supply valve 13 opens, and the drain pump 21 drives the water in the primary water tank 9 to the user end 24. Excess water returns to the primary water tank 9 through the return valve 12. When the temperature does not meet the requirements, the hot water valve 14 opens, and the water is sent to the air source heat pump unit 16 for reheating before being sent to the secondary water tank 17.

[0062] The secondary water tank 17 is equipped with a secondary temperature sensor 18 and a secondary liquid level sensor 19. When the liquid level and temperature meet the water delivery requirements, the secondary water supply valve 20 is opened, and the drainage pump 21 drives the water in the secondary water tank 17 to the user end 24. Excess water returns to the primary water tank 9 through the return valve 12.

[0063] The user terminal 24 is equipped with a terminal water supply valve 22 and a terminal temperature sensor 23. The terminal water supply valve 22, the primary water supply valve 13, and the secondary water supply valve 20 can be adjusted by the sensing values ​​of the terminal temperature sensor 23, the primary temperature sensor 10, and the secondary temperature sensor 18, thereby automatically controlling the water temperature. The terminal water supply valve 22 can be selected in automatic adjustment or manual adjustment mode according to actual needs.

[0064] In the system, the cooling water pump 1, circulating water pump 5, cold water pump 6, heating water pump 15, and drainage pump 21 can all be turned on and off independently and can be frequency-controlled. The primary water supply valve 13, the secondary water supply valve 20, and the terminal water supply valve 22 can be proportionally adjusted.

[0065] The distributed terminal circulating hot water system utilizing waste heat resources has seven operating modes: water source heat pump heating and storage mode, water source heat pump heating and delivery mode, combined heat pump heating and storage mode, combined heat pump heating and delivery mode, air source heat pump heating and storage mode, and air source heat pump heating and delivery mode.

[0066] Water source heat pump heating and water storage mode: The circulating water pump 5 drives the circulating water to the plate heat exchanger 4 to absorb the waste heat from the centralized waste heat resources, and then enters the evaporator of the water source heat pump 7 to dissipate heat. The cold water is driven by the cold water pump 6 and is heated to a certain temperature by the condenser. The water supply valve 8 is opened, and the hot water enters the primary water tank 9 to complete the primary water storage. At the same time, the hot water valve 14 is opened, the heating water pump 15 is started, and the air source heat pump unit 16 is turned off. The hot water in the primary water tank is driven by the heating water pump 15 and enters the secondary water tank 17 through the hot water valve 14. Both water tanks store water at the same time. When the secondary liquid level detector 19 detects that the liquid level has reached the set storage liquid level of the secondary water tank 17, the hot water valve 14 and the heating water pump 16 are closed. When the primary liquid level detector 10 detects that the liquid level has reached the set storage liquid level of the primary water tank 9, the water supply valve 8 is closed, and the water source heat pump unit 7 continues to supply hot water to other demand-side modules or stops. In this mode, no water supply is required, so the primary water supply valve 13, the secondary water supply valve 20, the return water valve 12, the terminal water supply valve 22, and the drainage pump 21 are normally closed.

[0067] Water source heat pump heating and water delivery mode: The circulating water pump 5 drives the circulating water to the plate heat exchanger 4 to absorb the waste heat from the centralized waste heat resources, and then enters the evaporator of the water source heat pump 7 to dissipate heat. The cold water is heated to a certain temperature by the condenser driven by the cold water pump 6. The water supply valve 8 is opened, and the hot water enters the primary water tank 9. The primary temperature sensor 10 senses a temperature value higher than the user's set water temperature value, so the primary water supply valve 13 and the return water valve 12 are opened. The drain pump 21 drives the water in the primary water tank 9 to be delivered to the user end 24. Excess water is discharged through... The return water valve 12 returns the water to the primary water tank 9. The user can set the terminal water supply valve 22 to either automatic or manual adjustment mode according to actual needs. In automatic mode, based on the temperature value sensed by the terminal temperature sensor 23, the terminal water supply valve 22 works in conjunction with the primary water supply valve 13, adjusting the opening degree to control water temperature and flow. In manual mode, the terminal water supply valve 22 is usually closed, assuming hot water is supplied only when it reaches the set temperature, thus saving water. Users can also manually adjust the terminal water supply valve 22 according to their needs. In this mode, centralized waste heat resources provide waste heat, and the water source heat pump 7 alone can meet the demand for hot water; therefore, the air source heat pump unit 16 is shut down to save energy.

[0068] Combined heat pump heating and water storage mode: The circulating water pump 5 drives the circulating water to the plate heat exchanger 4 to absorb the waste heat from the centralized waste heat resources, and then enters the evaporator of the water source heat pump 7 to dissipate heat. The cold water is heated to a certain temperature by the condenser driven by the cold water pump 6. The water supply valve 8 is opened, the hot water enters the primary water tank 9, the primary water supply valve 13 is closed, the heating water pump 15 and the hot water valve 14 are opened, and the air source heat pump unit 16 is started. Heating water pump 15 drives the hot water from primary water tank 9 through hot water valve 14 into the condenser of air source heat pump unit 16 for reheating. After being further heated, the hot water enters secondary water tank 17. When secondary level sensor 18 senses that secondary water tank 17 has reached the required level and primary level sensor 19 senses that primary water tank 17 has reached the required level, water supply valve 8 closes. Water source heat pump unit 7 supplies hot water to other demand-side modules, drain pump 21 opens, secondary water supply valve 20 opens, and return water valve 12 opens. Hot water in secondary water tank 17 goes to primary water tank 9 through secondary water supply valve 20 and return water valve 12, further heating the water in primary water tank 9. Meanwhile, the water at the bottom of primary water tank 9 continues to be heated by air source heat pump unit 16 and sent to secondary water tank 17. When primary temperature sensor 10 senses that the temperature of primary water tank 9 has risen to a stable level, air source heat pump unit 16, drain pump 21, secondary water supply valve 20, and return water valve 12 close. This model makes full use of waste heat resources while further increasing the water storage temperature, thereby expanding the applicable range and usage time of water storage and adding the ability to store water during off-peak periods.

[0069] Combined heat pump heating and water delivery mode: The circulating water pump 5 drives the circulating water to the plate heat exchanger 4 to absorb the waste heat from the centralized waste heat resources, and then enters the evaporator of the water source heat pump 7 to dissipate heat. The cold water is heated to a certain temperature by the condenser driven by the cold water pump 6. The water supply valve 8 is opened and the hot water enters the primary water tank 9. The primary temperature sensor 10 senses that the temperature value is lower than the water temperature value set by the user terminal 24. The primary water supply valve 13 is closed, the heating water pump 15 and the hot water valve 14 are opened, and the air source heat pump unit 16 is started. Heating pump 15 drives hot water from primary water tank 9 through hot water valve 14 into the condenser of air source heat pump unit 16 for reheating. After further heating, the hot water enters secondary water tank 17. When the water temperature sensed by secondary temperature sensor 18 is higher than the user's set temperature, secondary water supply valve 20 and return valve 12 open. Drain pump 21 drives the hot water in secondary water tank 17 through secondary water supply valve 20 to the user end 24. Excess water returns to primary water tank 9 through return valve 12. At this time, the temperature of the mixed water in primary water tank 9 will gradually increase. When the water temperature in primary water tank 9 meets the set temperature... When required, the primary water supply valve 13 can be opened, supplying water to both water tanks simultaneously. The water temperature can also be adjusted by changing the opening degree of the two water supply valves. The user can set an automatic or manual adjustment mode for the terminal water supply valve 22 according to actual needs. In automatic mode, based on the temperature value sensed by the terminal temperature sensor 23, the terminal water supply valve 22 works in conjunction with the other water supply valves, adjusting its opening degree to control water temperature and flow. In manual mode, the terminal water supply valve 22 is usually closed, assuming hot water is supplied only when it reaches the set temperature, thus saving water. In this mode, centralized waste heat resources provide waste heat. Since the water source heat pump 7 alone cannot meet the demand for hot water, the air source heat pump unit 16 is turned on to provide hot water, solving the problem of insufficient water temperature due to heat dissipation and time loss during water source heat pump transmission. The return water valve 12 achieves mixing and heating of the primary water tank 9, and the coordinated operation of the primary water supply valve 13, secondary water supply valve 20, and terminal water supply valve 22 achieves energy saving and temperature regulation.

[0070] Air source heat pump heating and water storage mode: Centralized waste heat resources have no waste heat supply. For example, when the air compressor unit 3 stops running, the water source heat pump 7 stops, the water supply valve 8 opens, and cold water enters the primary water tank 9 through the water supply valve 8 driven by the cold water pump 6. The primary water supply valve 13 closes, the heating water pump 15 and the hot water valve 14 open, and the air source heat pump unit 16 starts. The heating water pump 15 drives the water in the primary water tank 9 to enter the condenser of the air source heat pump unit 16 through the hot water valve 14 to absorb heat. After the cold water is heated, it enters the secondary water tank 17. When the secondary liquid level sensor 19 senses that the secondary water tank 17 has reached the required liquid level and the primary liquid level sensor 11 senses that the liquid level in the primary water tank 9 has reached the required liquid level, the water supply valve 8 closes, the drain pump 21 turns on, the secondary water supply valve 20 turns on, and the return water valve 12 turns on. The hot water in the secondary water tank 17 goes to the primary water tank 9 through the secondary water supply valve 20 and the return water valve 12, which further heats up the water in the primary water tank 9. Meanwhile, the water at the bottom of the primary water tank 9 continues to be heated by the air source heat pump unit 16 and sent to the secondary water tank 17. When the primary temperature sensor 10 senses that the temperature of the primary water tank 9 has risen to a stable level, the air source heat pump unit 16, the drain pump 21, the secondary water supply valve 20, and the return water valve 12 close. This mode is suitable for situations where the centralized waste heat resource supply is interrupted, but there is still a need for water storage and heat storage. Through the heating effect of the air source heat pump unit 16, hot water can still be produced even if the centralized waste heat resource is interrupted. In addition, the water temperature of the primary water tank 9 can also be increased through the return water valve 12.

[0071] Air source heat pump heating and water supply mode: Centralized waste heat resources provide no waste heat. For example, when air compressor unit 3 stops operating, water source heat pump 7 stops, water supply valve 8 opens, and cold water, driven by cold water pump 6, enters the primary water tank 9 through water supply valve 8. Primary water supply valve 13 closes, heating water pump 15 and hot water valve 14 open, and air source heat pump unit 16 starts. Heating water pump 15 drives water from primary water tank 9 through hot water valve 14 into the condenser of air source heat pump unit 16 to absorb heat. After being heated, the cold water enters the secondary water tank 17. When the water temperature sensed by secondary temperature sensor 18 is higher than the user's set temperature, secondary water supply valve 20 opens, return valve 12 opens, and drain pump 21 drives hot water from secondary water tank 17 to the user through secondary water supply valve 20. Excess water returns to primary water tank 9 through return valve 12. At this time, the mixed water temperature in primary water tank 9 will gradually increase. When the water temperature in primary water tank 9 meets the requirements... The primary water supply valve 13 can be opened, allowing simultaneous water supply from both water tanks. The water temperature can be adjusted by changing the opening degree of the two water supply valves. The user can set either an automatic or manual adjustment mode for the terminal water supply valve 22 based on actual needs. In automatic mode, the terminal water supply valve 22 works in conjunction with the other water supply valves, adjusting its opening degree to control water temperature and flow. In manual mode, the terminal water supply valve 22 is typically closed, assuming hot water is supplied only when the set temperature is reached, thus saving water. In this mode, even if the centralized waste heat resource supply is interrupted but hot water demand persists, the air source heat pump unit 16 provides heating to ensure hot water production even with the interruption of centralized waste heat resources. Furthermore, the return water valve 12 also raises the water temperature in the primary water tank 9. The coordinated operation of the primary water supply valve 13, the secondary water supply valve 20, and the terminal water supply valve 22 achieves energy saving and temperature regulation.

[0072] Water storage and delivery mode: Based on the aforementioned water storage and delivery modes, when the primary level sensor 11 detects the presence of water in the primary water tank 9 and the primary temperature sensor 10 senses that the temperature in the primary water tank 9 meets the requirements, the primary water delivery valve 13 opens, and the drain pump 21 drives the water to the user end 24. Similarly, when the secondary level sensor 19 detects the presence of water in the secondary water tank 17 and the secondary temperature sensor 18 senses that the temperature in the secondary water tank 17 meets the requirements, the secondary water delivery valve 20 opens, and the drain pump 21 drives the water to the user end 24. The user end 24 can set the terminal water supply valve 22 to automatic adjustment mode and manual adjustment mode according to actual needs. In automatic adjustment mode, based on the temperature value sensed by the terminal temperature sensor 23, the terminal water supply valve 22 works in conjunction with the other water delivery valves to complete the water temperature and flow regulation by adjusting the opening degree. In manual adjustment mode, the terminal water supply valve 22 can usually be closed, assuming that hot water can be delivered as long as it is above the set temperature, in order to save water. When the primary level sensor 11 detects the presence of water in the primary water tank 9, but the primary temperature sensor 10 senses that the temperature in the primary water tank is not up to standard, or when the secondary level sensor 19 detects the presence of water in the secondary water tank 17, but the secondary temperature sensor 18 senses that the temperature in the secondary water tank 17 is not up to standard, the air-source heat pump water delivery mode is activated to heat the water before delivery. This mode makes full use of the remaining water resources in the tank, avoiding waste caused by directly discharging cold water from the tank, and fully utilizes the peak-shaving storage capacity of the tank, thus increasing the system's applicable time and scope, and improving energy efficiency.

[0073] The above embodiments use air compressor waste heat resources as an example. Using other centralized waste heat resources cannot be considered as a substantial improvement to the present invention. Furthermore, regarding waste heat resource recovery methods, taking water source heat pumps as an example, depending on the nature of different waste heat resources, appropriate heat pump units can be selected to perform the function of absorbing waste heat to produce hot water. Selecting different heat pump units to adapt to the corresponding waste heat resources, or connecting different heat pump units in series or parallel, as well as the selection and series / parallel connection of air source heat pump units, and further splitting of the terminal demand-side water tank, cannot be considered as a substantial improvement to the present invention and should fall within the protection scope of the present invention.

Claims

1. A distributed terminal circulating hot water system utilizing waste heat resources, comprising a centralized waste heat resource recovery module and a distributed demand-side module; the centralized waste heat resource module includes a waste heat resource water circulation system, a hot water circulation system, and a water supply path connected in sequence by heat exchange; the distributed demand-side module includes multiple independent demand-side modules, each demand-side module including a primary water tank (9), an air source heat pump unit (16), a secondary water tank (17), and a user terminal (24) connected in sequence, wherein the primary water tank (9) is connected to the water supply path; characterized in that, The waste heat resource water circulation includes the heat dissipation water flow path of the air compressor unit and the first heat exchange channel of the plate heat exchanger (4); the hot water circulation includes the second heat exchange channel of the plate heat exchanger (4), the first heat exchange channel of the water source heat pump unit (7) and the circulating water pump (5) connected in sequence, and the circulating water pump (5) is connected to the second heat exchange channel of the plate heat exchanger (4) to form a circulation; the water supply flow path includes the cold water pump (6) and the second heat exchange channel of the water source heat pump unit (7) connected in sequence. The demand-side module includes a water supply valve (8), a primary water tank (9), a hot water valve (14), a heating water pump (15), an air source heat pump unit (16), a secondary water tank (17), a secondary water supply valve (20), a drainage pump (21), and a user terminal (24). The demand-side module also includes a primary water supply valve (13), a return water valve (12), and a terminal water supply valve (22); the primary water supply valve (13) is located between the primary water tank (9) and the drainage pump (21); the return water valve (12) is located between the primary water tank (9) and the user terminal (24); the terminal water supply valve (22) is connected to the user terminal (24); The primary water tank (9) is equipped with a primary temperature sensor (10) and a primary liquid level sensor (11). When the liquid level and temperature meet the preset water delivery requirements, the primary water supply valve (13) opens, and the drain pump (21) drives the water in the primary water tank (9) to the user end (24). Excess water returns to the primary water tank (9) through the return valve (12). When the temperature does not meet the preset requirements, the hot water valve (14) opens, and the water is sent to the air source heat pump unit (16) for reheating and then sent to the secondary water tank (17) under the drive of the hot water pump (15). The secondary water tank (17) is equipped with a secondary temperature sensor (18) and a secondary liquid level sensor. (19) When the liquid level and temperature meet the water delivery requirements, the secondary water supply valve (20) is opened, and the drainage pump (21) drives the water in the secondary water tank (17) to the user end (24). Excess water returns to the primary water tank (9) through the return valve (12). The user end (24) is equipped with an end water supply valve (22) and an end temperature sensor (23). Through the sensing values ​​of the end temperature sensor (23), the primary temperature sensor (10), and the secondary temperature sensor (18), the end water supply valve (22), the primary water supply valve (13), and the secondary water supply valve (20) can be adjusted to automatically regulate the water temperature.

2. A control method for a distributed terminal circulating hot water system utilizing waste heat resources according to claim 1, characterized in that, Based on environmental and user needs, the distributed terminal circulating hot water system utilizing waste heat resources is adjusted to one of the following modes: water source heat pump heating and storage mode, water source heat pump heating and delivery mode, combined heat pump heating and storage mode, combined heat pump heating and delivery mode, air source heat pump heating and storage mode, air source heat pump heating and delivery mode, and storage and delivery mode.

3. The control method according to claim 2, characterized in that, In the water source heat pump heating and water storage mode: the circulating water pump (5) drives the circulating water to the plate heat exchanger (4) to absorb the waste heat from the centralized waste heat resources, and then enters the evaporator of the water source heat pump to dissipate heat. The cold water is heated by the condenser driven by the cold water pump (6). The water supply valve (8) is opened, and the hot water enters the primary water tank (9) to complete the primary water storage. At the same time, the hot water valve (14) is opened, the heating water pump (15) is started, and the air source heat pump unit (16) is turned off. The hot water in the primary water tank is circulated through the evaporator. Driven by the superheated water pump (15), the hot water enters the secondary water tank (17) through the hot water valve (14). Both water tanks store water simultaneously. When the secondary liquid level sensor (19) detects that the liquid level has reached the set storage level of the secondary water tank (17), the hot water valve (14) and the heating water pump (15) are closed. When the primary liquid level sensor detects that the liquid level has reached the set storage level of the primary water tank (9), the water supply valve (8) is closed. The water source heat pump unit (7) continues to supply hot water to other demand-side modules or shuts down. The primary water supply valve (13), secondary water supply valve (20), return water valve (12), terminal water supply valve (22), and drain pump (21) are normally closed. In the water source heat pump heating and water supply mode: the circulating water pump (5) drives the circulating water to the plate heat exchanger (4) to absorb the waste heat of the centralized waste heat resources, and then enters the evaporator of the water source heat pump to dissipate heat. The cold water is heated by the condenser driven by the cold water pump (6). The water supply valve (8) is opened, and the hot water enters the primary water tank (9). When the temperature sensor (10) senses a temperature value higher than the user's set water temperature value, the primary water supply valve (13) opens, the return water valve (12) opens, and the drain pump (21) drives the water in the primary water tank (9) to be transported to the user (24). Excess water returns to the primary water tank (9) through the return water valve (12). According to the temperature value sensed by the terminal temperature sensor (23), the terminal water supply valve (22) works in conjunction with the primary water supply valve (13) to adjust the opening degree to complete the water temperature and flow rate regulation.

4. The control method according to claim 2, characterized in that, In the combined heat pump heating and water storage mode: the circulating water pump (5) drives the circulating water to the plate heat exchanger (4) to absorb the waste heat of the centralized waste heat resources, and then enters the evaporator of the water source heat pump to dissipate heat. The cold water is heated by the condenser driven by the cold water pump (6). The water supply valve (8) is opened, and the hot water enters the primary water tank (9). The primary water supply valve (13) is closed, the heating water pump (15) and the hot water valve (14) are opened, and the air source heat pump unit (16) is started. The heating water pump (15) drives the hot water in the primary water tank (9) to enter the condenser of the air source heat pump unit (16) for reheating through the hot water valve (14). After the hot water is further heated, it enters the secondary water tank (17). When the secondary liquid level sensor senses that the secondary water tank (17) has reached the liquid level requirement and the primary liquid level sensor ( 11) After sensing that the liquid level of the primary water tank (9) has reached the required level, the water supply valve (8) is closed, the water source heat pump unit (7) supplies hot water to other demand-side modules, the drain pump (21) is turned on, the secondary water supply valve (20) is turned on, the return water valve (12) is turned on, and the hot water in the secondary water tank (17) goes to the primary water tank (9) through the secondary water supply valve (20) and the return water valve (12), so that the water in the primary water tank (9) is further heated, while the water at the bottom of the primary water tank (9) continues to be heated by the air source heat pump unit (16) and sent to the secondary water tank (17). When the primary temperature sensor (10) senses that the temperature of the primary water tank (9) has risen to a stable level, the air source heat pump unit (16), the drain pump (21), the secondary water supply valve (20), and the return water valve (12) are turned off.In the combined heat pump heating and water supply mode: the circulating water pump (5) drives the circulating water to the plate heat exchanger (4) to absorb the waste heat from the centralized waste heat resources, and then enters the evaporator of the water source heat pump to dissipate heat. The cold water is heated to a certain temperature by the condenser through the cold water pump (6). The water supply valve (8) is opened, and the hot water enters the primary water tank (9). The primary temperature sensor (10) senses that the temperature value is lower than the user end (24) set water temperature value, the primary water supply valve (13) is closed, the heating water pump (15) and the hot water valve (14) are opened, the air source heat pump unit (16) is started, the heating water pump (15) drives the hot water in the primary water tank (9) to enter the condenser of the air source heat pump unit (16) for reheating through the hot water valve (14). After being further heated, the hot water enters the secondary water supply tank (9). When the water temperature sensed by the secondary temperature sensor (18) in the primary water tank (17) is higher than the user's set temperature, the secondary water supply valve (20) opens, the return valve (12) opens, and the drain pump (21) drives the hot water in the secondary water tank (17) to the user's end (24) through the secondary water supply valve (20). Excess water returns to the primary water tank (9) through the return valve (12). At this time, the temperature of the mixed water in the primary water tank (9) will gradually increase. When the water temperature in the primary water tank (9) meets the requirements, the primary water supply valve (13) opens, and the two water tanks supply water simultaneously. The water temperature is adjusted by adjusting the opening of the two water supply valves. According to the temperature value sensed by the terminal temperature sensor (23), the terminal water supply valve (22) works in conjunction with the other water supply valves to complete the water temperature and flow rate control by adjusting the opening.

5. The control method according to claim 2, characterized in that, In the air source heat pump heating and water storage mode: the centralized waste heat resource has no waste heat supply, the water source heat pump stops, the water supply valve (8) opens, the cold water is driven by the cold water pump (6) and enters the primary water tank (9) through the water supply valve (8), the primary water supply valve (13) closes, the heating water pump (15) and the hot water valve (14) open, the air source heat pump unit (16) starts, the heating water pump (15) drives the water in the primary water tank (9) to enter the condenser of the air source heat pump unit (16) through the hot water valve (14) to absorb heat, the cold water is heated and enters the secondary water tank (17), when the secondary liquid level sensor (19) senses that the secondary water tank (17) has reached the liquid level requirement and the primary liquid level sensor After the device (11) senses that the liquid level in the primary water tank (9) has reached the required level, the water supply valve (8) closes, the drain pump (21) starts, the secondary water supply valve (20) opens, and the return valve (12) opens. The hot water in the secondary water tank (17) goes to the primary water tank (9) through the secondary water supply valve (20) and the return valve (12), further heating the water in the primary water tank (9). Meanwhile, the water at the bottom of the primary water tank (9) continues to be heated by the air source heat pump unit (16) and sent to the secondary water tank (17). When the primary temperature sensor (10) senses that the temperature of the primary water tank (9) has risen to a stable level, the air source heat pump unit (16), the drain pump (21), and the secondary water supply valve (8) close. 20), return valve (12) is closed; in the air source heat pump heating and water supply mode: centralized waste heat resources have no waste heat supply, water source heat pump is stopped, water supply valve (8) is opened, cold water is driven by cold water pump (6) and enters the first-stage water tank (9) through water supply valve (8), the first-stage water supply valve (13) is closed, heating water pump (15) and hot water valve (14) are opened, air source heat pump unit (16) is started, heating water pump (15) drives the water in the first-stage water tank (9) to enter the condenser of air source heat pump unit (16) through hot water valve (14) to absorb heat, cold water is heated and enters the second-stage water tank (17), the water temperature sensed by the second-stage temperature sensor (18) is higher than that at the user end. When the temperature is set, the secondary water supply valve (20) is opened and the return water valve (12) is opened. The drain pump (21) drives the hot water in the secondary water tank (17) to be sent to the user end through the secondary water supply valve (20). The excess water returns to the primary water tank (9) through the return water valve (12). At this time, the temperature of the mixed water in the primary water tank (9) will gradually increase. When the water temperature in the primary water tank (9) meets the requirements, the primary water supply valve (13) is opened, and the two water tanks supply water at the same time. The water supply temperature is adjusted by adjusting the opening of the two water supply valves. According to the temperature value sensed by the terminal temperature sensor (23), the terminal water supply valve (22) works in coordination with the other water supply valves to complete the water temperature and flow rate control by adjusting the opening.

6. The control method according to claim 2, characterized in that, In the water storage and delivery mode: when the primary level sensor (11) detects that there is water in the primary water tank (9) and the primary temperature sensor (10) senses that the temperature in the primary water tank (9) meets the requirements, the primary water delivery valve (13) opens, and the drainage pump (21) drives the water to the user end (24). When the secondary level sensor (19) detects that there is water in the secondary water tank (17) and the secondary temperature sensor (18) senses that the temperature in the secondary water tank (17) meets the requirements, the secondary water delivery valve (20) opens, and the drainage pump (21) drives the water to the user end (24). According to the temperature value sensed by the terminal temperature sensor (23), the terminal water supply valve (22) works in conjunction with the other water supply valves to adjust the opening degree to control the water temperature and flow rate. When the primary level sensor (11) detects that there is water in the primary water tank (9), but the primary temperature sensor (10) senses that the temperature in the primary water tank does not meet the requirements, or when the secondary level sensor (19) detects that there is water in the secondary water tank (17), but the secondary temperature sensor (18) senses that the temperature in the secondary water tank (17) does not meet the requirements, the air source heat pump water supply mode is turned on to heat the water and then supply it.

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