Assembly type domestic hot water system for reconstructing fire-fighting high-level water tank coupled with air source heat pump

Abstract

The invention relates to an assembly type domestic hot water system for reconstructing a fire-fighting high-level water tank coupled with an air source heat pump, belongs to the technical field of building energy conservation, and solves the technical problem that a building area is relatively large due to the fact that an existing roof fire-fighting water tank and an air source heat pump heat storage water tank are independently arranged in the same area. The system comprises a machine room water tank unit, a fire fighting system unit, a heat supply unit and a water supply unit, the machine room water tank unit comprises an assembly type high-position fire fighting water tank room prefabricated machine room, a coupling shared water tank and a heat exchanger, the assembly type high-position fire fighting water tank room prefabricated machine room is arranged on a building roof, and the coupling shared water tank is arranged in the prefabricated machine room; the heat exchanger is arranged in the coupling common water tank. The coupling shared water tank serves as a core component and has the dual functions of fire-fighting storage water and domestic hot water system heat storage and heat exchange media, the building machine room area can be reduced, the building area utilization rate can be increased, meanwhile, the system form can be simplified, and the equipment purchase cost, maintenance cost and management cost can be reduced.

Description

Technical Field

[0001] This invention belongs to the field of building energy conservation technology, specifically a prefabricated domestic hot water system that reconstructs a fire-fighting high-level water tank coupled with an air source heat pump. Background Technology

[0002] With the increasing demands for fire safety and energy efficiency in the construction industry, the application of rooftop fire water tanks and air source heat pumps has gradually become an important part of building design. Fire protection systems are critical facilities for ensuring the safety of life and property, and regulations require that fire water tank rooms are typically located on the building roof to ensure compliance with water supply pressure and service height. Meanwhile, air source heat pumps, as a low-density renewable energy device, are also often installed on building roofs due to site limitations and noise pollution. However, in current conventional designs, rooftop fire water tanks and air source heat pump storage tanks are usually independently located in the same area, resulting in a large building footprint. Furthermore, the independent operation of the tanks, equipment, and related piping systems increases procurement costs and the complexity of subsequent operation and maintenance.

[0003] The separate placement of fire-fighting water tanks and hot water storage tanks has led to insufficient space utilization. In existing designs, fire-fighting water tanks are mainly used for emergency water supply in the early stages of a fire, while air-source heat pump hot water storage tanks focus on domestic hot water supply. Their functions are independent, lacking an effective integration solution. This separate design not only occupies valuable roof space but also results in a dispersed layout of related equipment, increasing construction difficulty and pipeline length, thereby raising construction and operating costs. Furthermore, existing technologies have limited research on the functional coupling of the two types of tanks, failing to develop an efficient integrated design approach that struggles to meet the energy-saving and space-optimization requirements of modern buildings.

[0004] Existing technologies have attempted to combine fire water tanks with air source heat pumps, but according to regulations, fire water tanks are not installed on the roof, resulting in a long distance between the connection point and the heat source pump, leading to low working efficiency. Furthermore, fire water tanks are difficult to integrate in a modular fashion, resulting in low installation efficiency for the overall device. Moreover, such fire water tanks cannot directly supply domestic water, often requiring the installation of other water tanks, which makes the structure and piping very complex. Summary of the Invention

[0005] This invention addresses the technical problem that existing rooftop fire water tanks and air source heat pump hot water storage tanks are typically installed independently in the same area, resulting in a large building footprint. To address this, the following technical solution is adopted:

[0006] A prefabricated domestic hot water system that reconfigures a fire-fighting elevated water tank coupled with an air-source heat pump includes:

[0007] The machine room water tank unit includes a prefabricated high-level fire water tank room, a coupling shared water tank, and a heat exchanger. The prefabricated high-level fire water tank room is located on the roof of the building, the coupling shared water tank is located inside the prefabricated machine room, and the heat exchanger is located inside the coupling shared water tank.

[0008] The fire protection system unit includes a main fire protection system pipeline and a fire protection system pressurization and stabilization device, wherein the main fire protection system pipeline is connected to the coupled shared water tank;

[0009] The heating unit includes an air source heat pump unit and a heat pump heat collection circulation pump. The air source heat pump unit is connected to the coupled shared water tank through a heat pump circulation pipeline to form a closed loop. The heat pump heat collection circulation pump is installed in the heat pump circulation pipeline.

[0010] The water supply unit includes a tap water supply pipeline, a domestic cold water supply pipeline, and a domestic hot water supply pipeline. The tap water supply pipeline is connected to the coupled shared water tank, and the domestic cold water supply pipeline and the domestic hot water supply pipeline are respectively connected to the heat exchanger.

[0011] Furthermore, the heat exchanger is a coil structure embedded within the coupled shared water tank.

[0012] Furthermore, the inlet end of the coil structure is located at the bottom or lower part of the coupled shared water tank, and the outlet end is located at the upper part of the coupled shared water tank.

[0013] Furthermore, the coupled shared water tank has a double-layer structure, including an inner water tank and an outer shell.

[0014] Furthermore, the coil structure is arranged in multiple layers side by side, with each layer of coil having an independent inlet end and outlet end.

[0015] Furthermore, it also includes a flow guide network disposed between the inner water tank and the outer shell, the flow guide network being connected to the domestic cold water supply pipe and the domestic hot water supply pipe.

[0016] Furthermore, an insulation structure is provided between the inner water tank and the outer shell.

[0017] Furthermore, the prefabricated high-level fire water tank room is a modular design, prefabricated from concrete and steel plates.

[0018] Furthermore, the coupled shared water tank is a prefabricated water tank, assembled from multiple stainless steel modules.

[0019] This invention also proposes a working method for a prefabricated domestic hot water system based on a reconstructed fire-fighting elevated water tank coupled with an air source heat pump, as described above, comprising the following steps:

[0020] S1: Firefighting water is supplied to the coupled shared water tank through the tap water supply pipeline;

[0021] S2: Start the air source heat pump unit and the heat pump collector circulation pump to transfer heat to the water in the coupled shared water tank;

[0022] S3: Domestic cold water enters the heat exchanger through the domestic cold water supply pipe, and after heat exchange, it is delivered to the user end through the domestic hot water supply pipe.

[0023] Furthermore, step S1 also includes a float switch that monitors the water level in real time and stops replenishing water when the water level reaches the effective water level.

[0024] Furthermore, this also includes hydration during S4 use, specifically including the following steps:

[0025] When the water level in the shared water tank exceeds the overflow level, the controller will forcibly close the valve on the tap water supply pipeline, and the alarm will sound accordingly.

[0026] When the water level in the shared water tank drops below the effective water level, the tap water supply pipeline will replenish water to the shared water tank under the action of the float switch. The replenishment will stop when the effective water level is reached. When the water level in the shared water tank is lower than the minimum alarm water level, the alarm will sound accordingly.

[0027] Furthermore, it also includes emergency or backup water replenishment for S5 fire fighting water, specifically including the following steps:

[0028] When the level sensor detects that the water level is lower than the fire water supply level, the controller closes the second solenoid valve and opens the first solenoid valve. The cold water in the domestic cold water supply pipe is quickly replenished to the coupled shared water tank through the fire water supply pipeline to ensure the safety of fire water.

[0029] Furthermore, when a diversion pipe network is installed, the heat exchange of domestic water in S3 is adjusted accordingly and includes the following steps: cold water in the domestic cold water supply pipe is diverted through the diversion pipe network into the multi-layer coil of the heat exchanger, each layer of coil performs heat exchange independently, and the hot water after heat exchange is collected through the hot water diversion pipe to the domestic hot water supply pipe, and finally delivered to the building's domestic hot water supply network.

[0030] Furthermore, the heating unit also includes a solar thermal collector circulation system, which comprises solar collectors and a solar thermal collector circulation pump. The solar collectors are installed on the building roof to collect solar energy and transfer the heat to the water in the coupled shared water tank through pipes. Specifically, the solar collectors and the coupled shared water tank are connected via solar circulation pipes to form a closed loop. The solar thermal collector circulation pump is connected in series in this closed loop to drive the flow of the heat transfer medium, transferring the heat generated by the solar collectors to the water in the coupled shared water tank.

[0031] Furthermore, the solar circulation pipeline connected to the solar collector and the heat pump circulation pipeline connected to the air source heat pump unit share a common pipeline at both the inlet and outlet ends of the water tank, which reduces the amount of piping required. At the same time, electromagnetic switching valves are installed on the non-shared pipelines connecting the inlet and outlet ends of both the solar circulation pipeline and the heat pump circulation pipeline. A temperature sensor is also installed in the coupled shared water tank. At this time, the air source heat pump unit and the solar collector can be controlled to transfer heat to the coupled shared water tank together or separately based on the temperature monitored by the temperature sensor. This ensures that the heat in the coupled shared water tank can be used to guarantee the supply of domestic hot water while saving energy.

[0032] Furthermore, the solar collector is connected to the tap water supply pipe through the collector inlet pipe for replenishing water to the solar collector.

[0033] Furthermore, step S2, which couples the heat storage of the shared water tank, includes the following steps:

[0034] S21 system initialization;

[0035] S22 Temperature Monitoring and Mode Selection.

[0036] The S21 system initialization specifically includes the following steps:

[0037] S211 initializes the electromagnetic switching valve to the default open state to maintain simultaneous heating by the solar collector circulation pump 14 and the air source heat pump unit.

[0038] S212 starts the solar collector and solar collector circulation pump. The solar collector circulation pump drives the flow of heat medium, transferring the heat generated by the solar collector to the water in the coupled shared water tank.

[0039] S213 starts the air source heat pump unit and the heat pump collector circulation pump. The heat pump collector circulation pump drives the flow of heat medium, transferring the heat generated by the heat pump unit to the water in the coupled shared water tank.

[0040] S22 temperature monitoring and mode selection includes the following steps:

[0041] S221 collects water temperature data T in real time by coupling a temperature sensor inside the shared water tank;

[0042] S222 When T < set threshold T1, enter the combined heating mode; when T ≥ set threshold T1, enter the selective heating mode; the specific value of T1 is selected according to indicators such as the building's domestic hot water consumption, water tank size, and water tank insulation coefficient.

[0043] Furthermore, the combined heating mode includes the following steps: the controller keeps the solar collector and air source heat pump unit running, as well as the electromagnetic switching valve open, to form a dual heat source parallel heating system.

[0044] Furthermore, selecting the heating mode includes the following steps: The controller selects the main heat source based on environmental parameters: When the solar radiation intensity is less than X0, the air source heat pump unit is selected as the main heat source, and the solar collector and solar collector circulation pump are put into standby mode, and the electromagnetic switching valve on the solar circulation pipeline is closed.

[0045] When the solar radiation intensity is ≥X0, switch the solar collector to the main heat source, open the electromagnetic switching valve on the solar circulation pipeline, and put the air source heat pump unit and the heat pump collector circulation pump into standby mode, and close the electromagnetic switching valve on the heat pump circulation pipeline.

[0046] Furthermore, it also includes system fault protection steps, specifically: when any heat source of the solar collector or air source heat pump unit fails, it automatically switches to another heat source and triggers an alarm.

[0047] This invention can achieve at least one of the following beneficial effects:

[0048] (1) Due to the diverse shapes of building roofs, high aesthetic requirements, and limited roof equipment layout area, using a coupled shared water tank as the core component to simultaneously serve as the heat storage and heat exchange medium for both fire-fighting water storage and domestic hot water systems can reduce the building's equipment room area, improve building area utilization, simplify the system configuration, and reduce equipment procurement, maintenance, and management costs. Furthermore, since the coupled shared water tank also functions as a hot water storage tank, it effectively solves the problem of freezing fire-fighting water tanks, meeting the mandatory requirement of a minimum temperature of 5°C. Especially in northern regions, this eliminates the need for HVAC heating equipment, reducing heating energy load and saving on heating equipment and piping.

[0049] (2) The heat pump collection system of the air source heat pump unit of the heating unit is an open system. It uses a coupled common water tank for circulating heat storage to complete the first side heat storage cycle. The heat medium water is the water stored in the water tank. The water stored in the coupled common water tank is only used for heat storage and is not used directly as hot water. Domestic hot water adopts indirect heat exchange to meet the requirement that the fire water volume is not used and to ensure the safety of the fire protection system.

[0050] (3) Since the water replenishment of the coupling shared water tank is made up by tap water, the coupling shared water tank only maintains the water replenishment for the leakage of the fire protection system pipeline network, resulting in a very small amount of water replenishment. The water stored in the tank is almost unused all year round, making the water quality uniform and stable, while avoiding the scaling problem of air source heat pump units during year-round operation.

[0051] (4) The water tank is equipped with a high-efficiency heat exchange coil for heat exchange. The domestic hot water system is a closed system. After the cold water is heat exchanged through the heat exchange coil in the hot water storage tank, it is connected to the domestic hot water system supply pipe to complete the secondary side heat exchange water supply, which improves the energy efficiency and has a good energy-saving effect.

[0052] (5) The prefabricated high-level fire water tank room and the coupled shared water tank both adopt a prefabricated structure, which can be prefabricated in the factory and only need to be cold connected on site, making the machine room easy to transport and install quickly.

[0053] (6) By setting up a double-layered, coupled shared water tank, on the one hand, the space between the inner water tank and the outer shell can achieve a heat preservation effect, further improving energy efficiency; on the other hand, the space between the inner water tank and the outer shell can be used for the arrangement of the diversion pipe network. Furthermore, the arrangement of the diversion pipe network can improve the heat exchange efficiency of the heat exchanger, thus ensuring a rapid supply of domestic hot water.

[0054] (7) By setting up fire water supply pipelines, the replenishment of water to the shared water tank can be accelerated, and as a backup pipeline for water supply, the safety of fire water supply can be further guaranteed.

[0055] (8) By setting up a solar thermal circulation system, the solar energy resources can be fully utilized. Combined with the heat generated by the air source heat pump unit, the heat supply to the coupled shared water tank can be maintained on the one hand, and the heat supply source can be switched according to environmental factors to reduce costs and improve energy efficiency.

[0056] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the specification or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained from the content specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0057] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0058] Figure 1 This is a schematic diagram of the overall structure of the prefabricated domestic hot water system with a reconstructed fire-fighting elevated water tank coupled to an air source heat pump, as proposed in Embodiment 1 of the present invention.

[0059] Figure 2 This is a schematic diagram of the overall structure of the coupled shared water tank in Embodiment 2 of the present invention;

[0060] Figure 3 This is a schematic diagram of the overall structure of the coupled shared water tank in Embodiment 3 of the present invention;

[0061] Figure 4 This is a flowchart of the working method of the prefabricated domestic hot water system that reconstructs the fire-fighting high-level water tank and couples it with an air source heat pump in Embodiment 4 of the present invention;

[0062] Figure 5 This is a schematic diagram of the overall structure of the prefabricated domestic hot water system with a reconstructed fire-fighting elevated water tank coupled to an air source heat pump, as proposed in Embodiment 5 of the present invention.

[0063] In the picture:

[0064] 1. Prefabricated high-level fire water tank room; 2. Coupled shared water tank; 3. Heat exchanger; 4. Air source heat pump unit; 5. Heat pump collector circulation pump; 6. Tap water supply pipeline; 7. Domestic cold water supply pipeline; 8. Domestic hot water supply pipeline; 9. Fire protection system main pipeline; 10. Roof; 11. Fire protection system pressurization and stabilization device; 12. Ladder; 13. Solar collector; 14. Solar collector circulation pump; 15. Electromagnetic switching valve; 16. Float switch; 17. Minimum alarm water level; 18. Effective water level; 19. Overflow water level; 20. Fire water supply level. Detailed Implementation

[0065] This invention relates to a prefabricated domestic hot water system that reconstructs a high-level fire-fighting water tank coupled with an air-source heat pump, by combining... Figures 1 to 5 The specific embodiments of the present invention will be described in detail below. The core component of this system is the coupled shared water tank 2, which, together with the prefabricated high-level fire water tank room 1, the air source heat pump unit 4, the heat pump collector circulation pump 5, the fire water supply system, and / or the solar collector circulation system, constitutes a complete energy-saving system. The following, in conjunction with the specific structures and reference numerals in the accompanying drawings, elaborates on the system's composition, operating principle, and practical application scenarios.

[0066] Example 1:

[0067] See Figure 1 A prefabricated domestic hot water system that reconstructs a fire-fighting elevated water tank coupled with an air source heat pump includes a machine room water tank unit, a fire-fighting system unit, a heating unit, and a water supply unit.

[0068] The water tank unit includes a prefabricated high-level fire water tank room 1, a coupling shared water tank 2, and a heat exchanger 3. The prefabricated high-level fire water tank room 1 is an integral prefabricated modular unit, designed for easy transportation and hoisting onto the building roof 10. The coupling shared water tank 2 is fixedly installed inside this prefabricated room. As a core component, the coupling shared water tank 2 serves the dual function of storing fire-fighting water and providing heat for both the domestic hot water system and the heat exchange medium. The coupling shared water tank 2 contains a heat exchanger 3, which employs an embedded copper coil structure arranged in multiple layers along the height of the tank. The inlet end of the coil is located at the bottom or lower part of the tank, and the outlet end is located at the upper part. Its heat exchange performance is designed according to actual needs; preferably, its heat exchange area is not less than 100 m². 2 .

[0069] Due to the diverse roof designs and high aesthetic requirements of buildings, coupled with limited rooftop equipment space, the use of a coupled shared water tank 2 as the core component, which simultaneously serves as both a fire-fighting water storage tank and a heat storage and heat exchange medium for domestic hot water systems, reduces the building's equipment room area, increases building area utilization, simplifies the system design, and lowers equipment procurement, maintenance, and management costs. Furthermore, since the coupled shared water tank 2 also functions as a hot water storage tank, it effectively solves the problem of freezing fire-fighting water tanks, meeting the mandatory requirement of a minimum temperature of 5°C. This is particularly beneficial in northern regions, eliminating the need for HVAC systems, reducing heating energy consumption, and saving on heating equipment and piping.

[0070] The fire protection system unit includes a main fire protection system pipe 9 and a fire protection system pressure boosting and stabilizing device 11. The main fire protection system pipe 9 provides fire-fighting water to the building. Specifically, a fire-fighting water output pipe is installed at the bottom of the coupled common water tank 2, which is connected to the main fire protection system pipe 9. The water stored in the coupled common water tank 2 can be used for fire-fighting purposes. The fire protection system pressure boosting and stabilizing device 11 is installed on the fire-fighting water output pipe and includes a water pump and a pressure regulating valve. The water pump is connected to the output pipe of the coupled common water tank 2 via a flange, and the pressure regulating valve is installed on the outlet side of the water pump to maintain stable water supply pressure. The control logic of the pressure boosting and stabilizing device monitors the water level and pressure changes in the tank in real time through sensors and automatically adjusts the operating status of the water pump. Through the installation of the fire protection system pressure boosting and stabilizing device 11, it can be ensured that the water stored in the coupled common water tank 2 can maintain sufficient pressure and stability when the fire protection system needs water supply, further ensuring the normal operation of the fire protection system.

[0071] The heating unit includes an air-source heat pump unit 4 and a heat pump collector circulation pump 5. Both the air-source heat pump unit 4 and the heat pump collector circulation pump 5 are installed on the building roof 10 and adjacent to the machine room, specifically outside the prefabricated machine room 1 of the prefabricated high-level fire water tank room. The air-source heat pump unit 4 is connected to the coupled shared water tank 2 through a heat pump circulation pipeline to form a closed loop. The heat pump collector circulation pump 5 is connected in series in this closed loop to drive the flow of the heat medium, transferring the heat generated by the heat pump unit 4 to the water in the coupled shared water tank 2.

[0072] The heat pump collection system of the air source heat pump unit of the heating unit is an open system. It uses a coupled common water tank for circulating heat storage to complete one side heat storage cycle. The heat transfer medium is the water stored in the water tank. The water stored in the coupled common water tank 2 is only used for heat storage and is not used directly as hot water. Domestic hot water adopts indirect heat exchange to meet the requirement that the fire water volume is not used and to ensure the safety of the fire protection system.

[0073] The water supply unit includes a tap water supply pipeline 6, a domestic cold water supply pipeline 7, and a domestic hot water supply pipeline 8. The supply end of the tap water supply pipeline 6 is connected to the municipal water supply network, and its outlet end is connected to the coupling shared water tank 2, which is used to replenish the water source of the water tank and maintain the water level of fire-fighting storage water.

[0074] Since the water supply for the coupling shared water tank 2 is provided by tap water, the coupling shared water tank 2 only maintains water supply for leaks in the fire protection system pipeline network, resulting in a very small water supply. The water stored inside the tank is almost never used, which makes the water quality uniform and stable, and at the same time avoids the scaling problem that occurs in the air source heat pump unit 4 during years of operation.

[0075] The supply end of the domestic cold water supply pipe 7 is directly connected to the building's domestic cold water supply network, and the outlet end is connected to the coupling shared water tank 2, and is led out from the bottom or lower part of the water tank. The supply end of the domestic hot water supply pipe 8 is connected to the coupling shared water tank 2, and is led out from the upper part of the water tank. The outlet end of the domestic hot water supply pipe 8 is directly connected to the building's domestic hot water supply network for supplying domestic hot water to the building. Specifically, the inlet end of the coil structure set in the coupling shared water tank 2 is connected to the domestic cold water supply pipe 7, and the outlet end is connected to the domestic hot water supply pipe 8 through the outlet pipe. The cold water in the domestic cold water supply pipe 7 enters the bottom of the coil from the bottom or lower part of the coupling shared water tank 2, is heated by the coupling shared water tank 2, and rises in temperature after heat exchange. Finally, it flows out from the top of the coil, and then flows out from the domestic hot water supply pipe 8 led out from the upper part of the water tank to the domestic hot water system, realizing the delivery of hot water to various hot water use points in the building.

[0076] The water tank 2 is equipped with a high-efficiency heat exchange coil. The domestic hot water system is a closed system. After the cold water is heated by the heat exchange coil in the hot water storage tank, it is connected to the domestic hot water supply pipe to complete the secondary heat exchange water supply, which improves the energy efficiency and has a good energy-saving effect.

[0077] Furthermore, the prefabricated high-level fire water tank room 1 is a modular design, prefabricated from concrete and steel plates. It is assembled from multiple standardized concrete modules and steel plates, and the modules are fixedly connected by embedded parts and bolts.

[0078] Furthermore, a support base is installed at the bottom of the module, and the support base is fixed to the building roof 10 by expansion bolts. The outer wall of the prefabricated machine room is coated with an anti-corrosion coating, and a gap is left between the inner wall and the shared water storage unit, which is filled with elastic shock-absorbing material.

[0079] Furthermore, the coupled shared water tank 2 is a prefabricated tank, assembled from multiple stainless steel modules. These modules are connected by bolts, and the joints are filled with waterproof sealant to ensure impermeability. The outer wall of the tank is insulated, and the design can be customized as needed. Preferably, the insulation layer uses polyurethane foam material with a thickness of not less than 50mm and a thermal conductivity controlled below 0.03W / m·K. The surface of the insulation layer is covered with metal sheets, and the joints of the sheets are welded to prevent gaps or seal failure during long-term use. After completion, the thermal conductivity and sealing performance of the insulation layer must be tested to ensure that the mandatory requirement of a minimum temperature of 5℃ for the fire water tank room is met.

[0080] The prefabricated high-level fire water tank room 1 and the coupled shared water tank 2 both adopt a prefabricated structure, which can be prefabricated in the factory and only need to be cold connected on site, making the equipment room easy to transport and install quickly.

[0081] Furthermore, a ladder 12 is also provided on the side wall of the coupling shared water tank 2, which can facilitate maintenance personnel to carry out maintenance on the coupling shared water tank 2.

[0082] Furthermore, a float switch is installed in the coupling shared water tank 2 to control the water level in the coupling shared water tank 2 that is supplied from the tap water supply pipe 6.

[0083] Furthermore, a removable stainless steel filter screen is installed at the inlet of the water supply pipe 6 in the coupled shared water tank 2 to intercept impurities, further reduce the impurity content of the water in the tank, ensure the cleanliness of the fire-fighting water, and avoid clogging of the fire-fighting pipes.

[0084] Example 2:

[0085] Based on Example 1, such as Figure 2As shown, the present invention further improves the coupling shared water tank 2 and the heat exchanger 3. Specifically, the coupling shared water tank 2 adopts a double-layer structure, including an inner water tank and an outer shell. The internal water tank space of the inner water tank is used to store fire-fighting water and use the stored water as a heat storage and heat exchange medium for the domestic hot water system, realizing the functions and effects described in Embodiment 1 above, which will not be repeated here. In addition, the space between the inner water tank and the outer shell can play a heat preservation role, further improving energy efficiency.

[0086] Based on this, the heat exchanger 3 adopts a multi-layer parallel coil structure, with each layer of coil structure having an independent inlet and outlet end. A flow guide network is also provided between the inner water tank and the outer shell of the coupling common water tank 2. The flow guide network includes multiple cold water flow guide pipes and multiple hot water flow guide pipes. Through the setting of the flow guide network, before the domestic cold water supply pipe 7 enters the heat exchanger 3, the cold water is pre-diverted through the cold water flow guide pipes, so that the cold water enters the multi-layer parallel coils of the heat exchanger 3 separately. Therefore, each layer of coils performs heat exchange independently. Since the temperature of the coupling common water tank 2 is uniformly distributed, the efficient heat exchange and heating of the cold water can be guaranteed, and the hot water supply efficiency is improved. After heat exchange in each layer of coils, the hot water passes through the outlet end of the coil and then collects into the domestic hot water supply pipe 8 through the hot water flow guide pipe.

[0087] By using a double-layered, coupled shared water tank 2, the space between the inner tank and the outer shell provides insulation, further improving energy efficiency. Furthermore, this space can be used for the arrangement of a flow distribution network. This network also enhances the heat exchange efficiency of the heat exchanger 3, ensuring a rapid supply of domestic hot water.

[0088] Furthermore, both the inner tank and the outer shell of the coupled shared water tank 2 are prefabricated structures. The inner and outer spaces of the coupled shared water tank 2 are filled with insulation structures, preferably insulation boards.

[0089] Example 3:

[0090] Based on Embodiment 1 and Embodiment 2, as Figure 2 and Figure 3As shown, this invention further improves the water supply to the coupled shared water tank 2. Specifically, the coupled shared water tank 2 is equipped with a float switch 16. In addition, a controller and an alarm are installed in the prefabricated machine room 1 of the prefabricated high-level fire water tank room. Such a control structure and alarm unit are conventional designs in the field and will not be described in detail here. The float switch 16 is used to control the water level in the coupled shared water tank 2 that is supplied from the tap water supply pipe 6. The water level in the coupled shared water tank 2 is set with an overflow water level 19, a minimum alarm water level 17, and an effective water level 18 located at the overflow water level 19 and the minimum alarm water level 17. When the fire water in the coupled shared water tank 2 is only used as a heat exchange medium and not for fire water supply, the controller and alarm will act accordingly based on the water level, as follows: When the water level in the shared water tank 2 exceeds the overflow level 19, it indicates that the float switch 16 may be damaged, causing water to continuously flow into the tap water supply pipe 6, resulting in an excessively high water level in the tank. In this case, the controller will forcibly close the valve on the tap water supply pipe 6, and the alarm will sound accordingly. When the water level in the shared water tank 2 drops below the effective water level 18, the tap water supply pipe 6 will replenish water to the shared water tank 2 under the action of the float switch 16, and will stop replenishing water when the effective water level is reached, ensuring that the water level in the shared water tank 2 is always at the effective water level 18. When the water level in the shared water tank 2 is lower than the minimum alarm level 17, it indicates that there may be a leak in the water tank or pipe network, and the alarm will sound accordingly.

[0091] When the fire-fighting water in the coupling shared water tank 2 is used for fire-fighting purposes, the water stored in the tank will be connected to the main fire-fighting system pipe 9 through the fire-fighting water output pipe at the bottom. At the same time, under the action of the float switch 16, the water in the tap water supply pipe 6 will be continuously replenished into the water tank to ensure fire-fighting water supply.

[0092] In addition, in this embodiment, a liquid level sensor (not shown in the figure) and a fire-fighting water supply level 20 are also installed in the coupling shared water tank 2. A section of fire-fighting water supply pipeline is also branched off from the domestic cold water supply pipe 7. One end of the fire-fighting water supply pipeline is connected to the domestic cold water supply pipe 7, and the other end is connected to the coupling shared water tank 2. At this time, the fire-fighting water supply pipeline and the domestic cold water supply pipe 7 are connected in parallel to a part of the coupling shared water tank 2. Furthermore, a first solenoid valve is installed on the fire-fighting water supply pipeline. Normally closed, a second solenoid valve is also installed on the part of the pipeline that is connected in parallel with the domestic cold water supply pipe 7 and the fire water replenishment pipe. When the level sensor detects that the water level of the coupled common water tank 2 drops to the fire water replenishment level 20, the controller will close the second solenoid valve and open the first solenoid valve, so that the cold water in the domestic cold water supply pipe 7 is supplied to the coupled common water tank 2, which speeds up the replenishment of the water tank. In addition, it can be used as a backup replenishment pipeline when the tap water replenishment pipeline 6 fails, further ensuring the safety of fire water.

[0093] By setting up fire water supply pipelines, the replenishment of water to the shared water tank can be accelerated, and the pipelines can also serve as backup water supply lines, further ensuring the safety of fire water supply.

[0094] Example 4:

[0095] Based on Examples 1 to 4, such as Figure 4 As shown, in order to facilitate the realization of the functions and effects of the prefabricated domestic hot water system with a reconstructed fire-fighting elevated water tank coupled with an air source heat pump, the present invention also proposes a working method for the prefabricated domestic hot water system with a reconstructed fire-fighting elevated water tank coupled with an air source heat pump, which specifically includes the following steps:

[0096] S1 Initial water supply for fire fighting: Water supply pipeline 6 is coupled to a common water tank 2 to supply fire fighting water.

[0097] S2 Coupling and Shared Water Tank 2 Heat Storage: Air Source Heat Pump Unit 4 and Heat Pump Collector Circulation Pump 5 are started. Heat Pump Collector Circulation Pump 5 drives the flow of heat medium, transferring the heat generated by Heat Pump Unit 4 to the water in Coupling and Shared Water Tank 2, completing one side heat storage cycle.

[0098] S3 Domestic water heat exchange: Cold water in the domestic cold water supply pipe 7 enters the coil of the heat exchanger 3, the coil performs heat exchange, and the hot water after heat exchange flows into the domestic hot water supply pipe 8, and is finally directly delivered to the building's domestic hot water supply network.

[0099] It also includes the activation of the fire protection system unit in the event of a fire: the fire protection system unit is in standby mode, and when a fire occurs, the fire protection system pressurization and stabilization device 11 is activated, and the water in the common water tank 2 is coupled to the fire protection system main pipeline 9 through the fire water output pipeline to provide stable fire water.

[0100] Furthermore, step S1 also includes a float switch 16 that monitors the water level in real time and stops replenishing water when the water level reaches the effective water level 18.

[0101] Furthermore, this also includes hydration during S4 use, specifically including the following steps:

[0102] When the water level in the shared water tank 2 exceeds the overflow level 19, the controller will forcibly close the valve on the tap water supply pipeline 6, and the alarm will sound accordingly.

[0103] When the water level in the coupled shared water tank 2 drops below the effective water level 18, the tap water supply pipe 6 will replenish water to the coupled shared water tank 2 under the action of the float switch 16, and will stop replenishing water when the effective water level is reached.

[0104] When the water level in the shared water tank 2 is lower than the minimum alarm water level 17, the alarm will sound accordingly.

[0105] Furthermore, it also includes emergency or backup water replenishment for S5 fire fighting water, specifically including the following steps:

[0106] When the level sensor detects that the water level is lower than the fire water replenishment level 20, the controller closes the second solenoid valve and opens the first solenoid valve. The cold water in the domestic cold water supply pipe 7 is quickly replenished to the coupled common water tank 2 through the fire water replenishment pipe to ensure the safety of fire water.

[0107] Furthermore, when a diversion pipe network is installed, the heat exchange of domestic water in S3 is adjusted accordingly and includes the following steps: the cold water in the domestic cold water supply pipe 7 is diverted into the multi-layer coil of the heat exchanger 3 through the diversion pipe network, each layer of coil performs heat exchange independently, and the hot water after heat exchange is collected into the domestic hot water supply pipe 8 through the hot water diversion pipe, and finally delivered to the building's domestic hot water supply network.

[0108] Example 5:

[0109] Based on Embodiments 1 to 3, the present invention further improves the heating unit, as follows:

[0110] like Figure 5As shown, the heating unit also includes a solar thermal circulation system, which includes a solar collector 13 and a solar thermal circulation pump 14. The solar collector 13 is installed on the building roof 10 to collect solar energy and transfer the heat to the water in the coupled common water tank 2 through pipes. Specifically, the solar collector 13 and the coupled common water tank 2 are connected through solar circulation pipes to form a closed loop. The solar thermal circulation pump 14 is connected in series in this closed loop to drive the flow of the heat transfer medium, transferring the heat generated by the solar collector 13 to the water in the coupled common water tank 2.

[0111] Furthermore, the solar circulation pipeline connected to the solar collector 13 and the heat pump circulation pipeline connected to the air source heat pump unit 4 share a section of pipeline at both the inlet and outlet ends of the water tank, which can reduce the pipeline setup. At the same time, electromagnetic switching valves 15 are installed on the non-shared pipelines connecting the inlet and outlet ends of both the solar circulation pipeline and the heat pump circulation pipeline. A temperature sensor is also installed in the coupled shared water tank 2. At this time, the air source heat pump unit 4 and the solar collector 13 can be controlled to transfer heat to the coupled shared water tank 2 together or separately according to the temperature monitored by the temperature sensor. While saving energy, it can also ensure that the heat in the water tank of the coupled shared water tank 2 can be used to ensure the supply of domestic hot water.

[0112] Furthermore, the solar collector 13 is connected to the tap water supply pipe 6 through the collector inlet pipe for replenishing water to the solar collector 13.

[0113] When the demand for domestic hot water in the building is high, the temperature sensor detects a decrease in the temperature of the coupled shared water tank 2. This allows the electromagnetic switching valve 15 to be controlled, enabling the solar collector 13 and the air source heat pump unit 4 to simultaneously transfer heat to the coupled shared water tank 2 for energy supply. When the demand for domestic hot water is low, the temperature sensor detects a stable temperature in the coupled shared water tank 2. The controller can then control the electromagnetic switching valve 15 based on factors such as outdoor sunlight intensity and ambient temperature, switching the solar collector 13 and the air source heat pump unit 4 to supply heat to the coupled shared water tank 2 respectively.

[0114] By setting up a solar thermal circulation system, solar energy resources can be fully utilized. Combined with the heat generated by the air source heat pump unit 4, the system can maintain the heat supply to the coupled shared water tank 2 on the one hand, and switch the heat supply source according to environmental factors on the other hand, thereby reducing costs and improving energy efficiency.

[0115] Example 6:

[0116] Based on Embodiments 1 to 5, this invention proposes a corresponding working method for a prefabricated domestic hot water system that reconstructs a fire-fighting high-level water tank coupled with an air source heat pump when the heating unit also includes a solar thermal collection and circulation system. Except for step S2, which couples the heat storage of the shared water tank 2, the other steps are the same as in Embodiment 4 and will not be repeated here.

[0117] Specifically, step S2, which couples the heat storage of the shared water tank 2, includes the following steps:

[0118] S21 system initialization;

[0119] S22 Temperature Monitoring and Mode Selection.

[0120] The S21 system initialization specifically includes the following steps:

[0121] S211 initializes the electromagnetic switching valve 15 to the default open state, thereby maintaining simultaneous heating by the solar thermal circulation pump 14 and the air source heat pump unit 4.

[0122] S212 starts the solar collector 13 and the solar collector circulation pump 14. The solar collector circulation pump 14 drives the flow of heat medium to transfer the heat generated by the solar collector 13 to the water in the coupled common water tank 2.

[0123] S213 starts the air source heat pump unit 4 and the heat pump heat collection circulation pump 5. The heat pump heat collection circulation pump 5 drives the heat medium to flow, transferring the heat generated by the heat pump unit 4 to the water in the coupled common water tank 2.

[0124] S22 temperature monitoring and mode selection includes the following steps:

[0125] S221 collects water temperature data T in real time by coupling a temperature sensor inside the shared water tank 2;

[0126] S222 When T < set threshold T1, enter the combined heating mode; when T ≥ set threshold T1, enter the selective heating mode; the specific value of T1 is selected according to indicators such as the building's domestic hot water consumption, water tank size, and water tank insulation coefficient.

[0127] Furthermore, the combined heating mode includes the following steps: the controller keeps the solar collector 13 and the air source heat pump unit 4 running, and the electromagnetic switching valve 15 open, forming a dual heat source parallel heating system.

[0128] Furthermore, the selection of the heating mode includes the following steps: The controller selects the main heat source according to the environmental parameters: When the solar radiation intensity is less than X0, the air source heat pump unit 4 is selected as the main heat source, and the solar collector 13 and the solar collector circulation pump 14 are put into standby mode, and the electromagnetic switching valve 15 on the solar circulation pipeline is closed.

[0129] When the solar radiation intensity is ≥X0, the solar collector 13 is switched to be the main heat source, and the electromagnetic switching valve 15 on the solar circulation pipeline is opened; and the air source heat pump unit 4 and the heat pump collector circulation pump 5 are put into standby mode, and the electromagnetic switching valve 15 on the heat pump circulation pipeline is closed.

[0130] Furthermore, it also includes a system fault protection step, specifically: when either the solar collector 13 or the air source heat pump unit 4 fails, it automatically switches to the other heat source and triggers an alarm.

[0131] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A prefabricated domestic hot water system that reconfigures a high-level fire-fighting water tank coupled with an air-source heat pump, characterized in that, include: The computer room includes a water tank unit, a fire protection system unit, a heating unit, and a water supply unit. The machine room water tank unit includes a prefabricated high-level fire water tank room (1), a coupling shared water tank (2), and a heat exchanger (3). The prefabricated high-level fire water tank room (1) is located on the building roof (10), the coupling shared water tank (2) is located inside the prefabricated machine room (1), and the heat exchanger (3) is located inside the coupling shared water tank (2).

2. The system according to claim 1, characterized in that, The fire protection system unit includes a fire protection system main pipeline (9) and a fire protection system booster and pressure stabilizing device (11), and the fire protection system main pipeline (9) is connected to the coupling shared water tank (2).

3. The system according to claim 1, characterized in that, The heating unit includes an air source heat pump unit (4) and a heat pump heat collection circulation pump (5). The air source heat pump unit (4) is connected to the coupled common water tank (2) through a heat pump circulation pipeline to form a closed loop. The heat pump heat collection circulation pump (5) is installed in the heat pump circulation pipeline.

4. The system according to claim 1, characterized in that, The water supply unit includes a tap water supply pipe (6), a domestic cold water supply pipe (7), and a domestic hot water supply pipe (8). The tap water supply pipe (6) is connected to the coupled shared water tank (2), and the domestic cold water supply pipe (7) and the domestic hot water supply pipe (8) are respectively connected to the heat exchanger (3).

5. The system according to claim 1, characterized in that, The heat exchanger (3) is a coil structure embedded in the coupled common water tank (2).

6. The system according to claim 5, characterized in that, The inlet end of the coil structure is located at the bottom or lower part of the coupled common water tank (2).

7. The system according to claim 5, characterized in that, The outlet end of the coil structure is located at the top of the coupled common water tank (2).

8. The system according to claim 1, characterized in that, The prefabricated high-level fire water tank room (1) is a modular design and is prefabricated from concrete and steel plates.

9. The system according to claim 1, characterized in that, The shared water tank is a prefabricated tank, assembled from multiple stainless steel modules.

10. A method for operating a prefabricated domestic hot water system based on a reconstructed fire-fighting elevated water tank coupled with an air-source heat pump as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Firefighting water is supplied to the coupled shared water tank (2) through the tap water supply pipeline (6); S2: Start the air source heat pump unit (4) and the heat pump collector circulation pump (5) to transfer heat to the water in the coupled common water tank (2); S3: Domestic cold water enters the heat exchanger (3) through the domestic cold water supply pipe (7), and after heat exchange, it is delivered to the user end through the domestic hot water supply pipe (8).

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