Composite hot water supply system and control method

Abstract

The invention relates to a combined type hot water supply system and a control method, the combined type hot water supply system comprises a heat pump unit, a photovoltaic heating device, an electric heating device, a heating water tank, a heat preservation water tank, a water supply tail end and a control assembly which are communicated through a pipeline assembly, and the heat pump unit and the photovoltaic heating device are connected in parallel and then connected with the electric heating device in series; a first series branch in the pipeline assembly communicates with the water outlet end of the heat pump unit and the water inlet end of the photovoltaic heating device, a second series branch communicates with the water outlet end of the photovoltaic heating device and the water inlet end of the heat pump unit, and the control assembly is used for achieving flow direction control of water flow in the pipeline assembly. According to the combined type hot water supply system, the communication states of the heat pump unit, the photovoltaic heating device and the electric heating device are controlled to be switched, the optimal working mode can be switched according to the operation working condition, the hot water requirement is guaranteed, meanwhile, energy is utilized to the maximum degree, and the energy consumption of the combined type hot water supply system is reduced.

Description

Technical Field

[0001] This application relates to the field of heating technology, and in particular to a composite hot water supply system and control method. Background Technology

[0002] In traditional hot water supply systems, hot water is often supplied by connecting heat pump units in parallel with other hot water systems (such as solar water heating systems). When solar energy is sufficient, the water is heated independently by a solar heating device. When solar energy is insufficient to meet the heating demand, the water is heated independently by a heat pump unit.

[0003] However, existing technologies simply connect solar water heating systems to hot water tanks. Solar water heating systems and heat pump water heating systems are essentially two independently operating hot water production systems, which have drawbacks in energy distribution and full utilization, and cannot achieve maximum energy utilization while ensuring hot water demand. Summary of the Invention

[0004] This application provides a composite hot water supply system and control method to solve the technical problem that existing hot water supply systems cannot maximize energy utilization while ensuring hot water demand.

[0005] In a first aspect, this application provides a composite hot water supply system, comprising: Heat pump units; Photovoltaic heating device; Electric heating device; Heating water tank; Insulated water tank; Water supply terminal; The piping assembly is connected to the heat pump unit, the photovoltaic heating device, the electric heating device, the heating water tank, the insulated water tank, and the water supply terminal, respectively. The heat pump unit and the photovoltaic heating device are connected in parallel and then connected in series with the electric heating device, and both are connected to the inlet and outlet of the heating water tank. The piping assembly includes a first series branch and a second series branch. The first series branch is connected to the outlet of the heat pump unit and the inlet of the photovoltaic heating device, respectively, and the second series branch is connected to the outlet of the photovoltaic heating device and the inlet of the heat pump unit, respectively. The control component includes a valve assembly unit and a pump assembly unit. The control component is installed on the pipeline assembly and is used to control the flow direction of water in the pipeline assembly.

[0006] Optionally, the piping assembly also includes a first circulating water path and a second circulating water path. The heat pump unit is connected to the heating water tank through the first circulating water path, and the photovoltaic heating device is connected to the heating water tank through the second circulating water path. The first series branch and the second series branch are respectively connected to the first circulating water path and the second circulating water path. The valve assembly unit includes a first control valve and a second control valve. The first control valve is located on the first series branch and is used to control the on / off state of the first series branch. The second control valve is located on the second series branch and is used to control the on / off state of the second series branch.

[0007] Optionally, the piping assembly also includes a water tank inlet pipe, the inlet end of which is connected to the first circulating water circuit and the second circulating water circuit respectively; the outlet end of the water tank inlet pipe is connected to the heating water tank and the heat preservation water tank respectively.

[0008] Optionally, the electric heating device is installed on the water inlet pipe of the water tank.

[0009] Optionally, the water tank inlet pipe includes a first inlet branch and a second inlet branch, the first inlet branch being connected to the heating water tank and the second inlet branch being connected to the insulation water tank; The valve assembly unit also includes a third control valve and a fourth control valve. The third control valve is located on the first inlet branch and is used to control the on / off state of the first inlet branch. The fourth control valve is located on the second inlet branch and is used to control the on / off state of the second inlet branch.

[0010] Optionally, the piping assembly also includes a water tank outlet pipe, the outlet end of which is connected to the first circulating water circuit and the second circulating water circuit respectively; the water tank outlet pipe includes a first outlet branch and a second outlet branch, the first outlet branch being connected to the heating water tank and the second outlet branch being connected to the insulation water tank. The pump unit includes a first circulating pump and a second circulating pump. The first circulating pump is located on the first outlet branch, and the second circulating pump is located on the second outlet branch.

[0011] Optionally, the first circulation pump and the second circulation pump are connected in parallel, and the valve group unit further includes a fifth control valve, which is connected to the inlet of the first circulation pump and the second circulation pump respectively.

[0012] Optionally, the piping assembly also includes a third series branch, which is connected to the heating water tank and the insulation water tank respectively; The valve assembly unit includes a sixth control valve, which is located on the third series branch and is used to control the on / off state of the third series branch.

[0013] Optionally, the piping assembly also includes a water supply circulation pipeline, which is connected to the insulated water tank and the water supply terminal respectively; The pump unit includes multiple water supply pumps connected in parallel in the water supply circulation pipeline.

[0014] Optionally, the heating water tank is equipped with a first liquid level detection device, and the insulated water tank is equipped with a second liquid level detection device. The control component is connected to the first liquid level detection device and the second liquid level detection device respectively.

[0015] Secondly, this application provides a control method applied to the composite hot water supply system provided in the first aspect of this application, comprising the following steps: Monitor the outlet water temperature and outdoor temperature of the photovoltaic heating device; The operating mode of the composite hot water supply system is determined based on the outlet water temperature of the photovoltaic heating device and the outdoor temperature. The operating status of the heat pump unit, photovoltaic heating device, and electric heating device is controlled according to the working mode of the composite hot water supply system, and the water flow direction in the pipeline components is also controlled.

[0016] Optionally, the operating mode of the combined hot water supply system can be determined based on the outlet water temperature of the photovoltaic heating device and the outdoor temperature, including: If the outlet water temperature GT of the photovoltaic heating device is greater than the first temperature threshold GT1, the working mode of the composite hot water supply system is the photovoltaic independent heating mode; If the first temperature threshold GT1 ≥ the outlet water temperature GT of the photovoltaic heating device > the second temperature threshold GT2, and the outdoor temperature WT > the ambient temperature threshold WT1, the working mode of the composite hot water supply system is the heat pump photovoltaic composite heating mode. If the second temperature threshold GT2 ≥ the outlet water temperature GT of the photovoltaic heating device > the third temperature threshold GT3, and the outdoor temperature WT > the ambient temperature threshold WT1, the working mode of the composite hot water supply system is the photovoltaic heat pump composite heating mode. If the first temperature threshold GT1 ≥ the outlet water temperature GT of the photovoltaic heating device > the third temperature threshold GT3, and the outdoor temperature WT ≤ the ambient temperature threshold WT1, the working mode of the composite hot water supply system is the photovoltaic electric heating composite heating mode. If the outlet water temperature GT of the photovoltaic heating device is less than or equal to the third temperature threshold GT3, and the outdoor temperature WT is greater than the ambient temperature threshold WT1, the working mode of the composite hot water supply system is the independent heating mode of the heat pump. If the outlet water temperature GT of the photovoltaic heating device is less than or equal to the third temperature threshold GT3, and the outdoor temperature WT is less than or equal to the ambient temperature threshold WT1, the working mode of the composite hot water supply system is the electric heating independent heating mode.

[0017] Optionally, the operating status of the heat pump unit, photovoltaic heating device, and electric heating device is controlled according to the working mode of the composite hot water supply system; and the water flow direction in the pipeline components is controlled, including: When the combined hot water supply system is in heat pump and photovoltaic combined heating mode, the heat pump unit and photovoltaic heating device are turned on, the first series branch is opened, the second series branch is closed, and the water flows through the heat pump unit for preheating before entering the photovoltaic heating device for heating. When the combined hot water supply system is in photovoltaic heat pump combined heating mode, the heat pump unit and photovoltaic heating device are turned on, the first series branch is closed, the second series branch is opened, and the water flows through the photovoltaic heating device for preheating before entering the heat pump unit for heating. When the combined hot water supply system is in a photovoltaic and electric heating combined heating mode, the photovoltaic heating device and the electric heating device are turned on, and the first series branch and the second series branch are both turned off. The water flows through the photovoltaic heating device and the electric heating device in sequence.

[0018] Optionally, the control method further includes the following steps: setting the optimal operating frequency of the heat pump unit, and operating at the optimal operating frequency when the heat pump unit is turned on; Monitor the water temperature jt in the heating water tank. If jt < the first set water temperature threshold jt0, increase the number of main units operating and the operating frequency of the heat pump unit. When the number of main units operating and the operating frequency of the heat pump unit both reach the upper limit, if jt < the first set water temperature threshold jt0, the electric heating device will be turned on.

[0019] Optionally, the control method further includes the following steps: Obtain the number of times N is replenished to the insulated water tank within the preset water supply period; Obtain the preset liquid level threshold JY0 of the heating water tank and the preset liquid level threshold BY0 of the insulation water tank; The preset liquid level threshold BY0 of the insulated water tank is adjusted according to the number of water replenishments N, and the preset liquid level threshold JY0 of the heating water tank is adjusted according to the outlet water temperature of the photovoltaic heating device. Monitor the current liquid level JY in the heating water tank and the current liquid level BY in the insulation water tank; Based on the preset liquid level threshold JY0 and the current liquid level JY of the heating water tank, confirm the replenishment of water to the heating water tank; Based on the preset liquid level threshold BY0 and the current liquid level BY of the insulated water tank, confirm the replenishment of water to the insulated water tank.

[0020] The technical solutions provided in this application have the following advantages compared with the prior art: The composite hot water supply system provided in this application embodiment connects a heat pump unit and a photovoltaic heating device in parallel via a piping assembly, and then connects them in series with an electric heating device. All components are connected to the inlet and outlet of the heating water tank. This allows the heat pump unit and the electric heating device to be used together for heating, or the photovoltaic heating device and the electric heating device to be used together for heating. The piping assembly includes a first series branch and a second series branch. The first series branch is connected to the outlet of the heat pump unit and the inlet of the photovoltaic heating device, respectively. The second series branch is connected to the outlet of the photovoltaic heating device and the inlet of the heat pump unit, respectively. This allows for series connection between the heat pump unit and the photovoltaic heating device. A control component controls the flow direction of water within the piping assembly, enabling independent heating of the heat pump unit, photovoltaic heating device, and electric heating device; heating of any two components in combination; and heating of all three components in series. This allows for switching to the optimal operating mode based on operating conditions, ensuring hot water demand while maximizing energy utilization and reducing the energy consumption of the composite hot water supply system.

[0021] The control method provided in this application embodiment is applied to the above-mentioned composite hot water supply system. It can switch to the optimal working mode according to the operating conditions, and therefore naturally possesses the technical effects of the above-mentioned composite hot water supply system. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0025] Figure 1 This is a connection diagram of a composite hot water supply system provided in an embodiment of this application; Figure 2 A schematic diagram of the first interconnected state of the composite hot water supply system provided in an embodiment of this application; Figure 3 A schematic diagram of the second interconnected state of the composite hot water supply system provided in an embodiment of this application; Figure 4A schematic diagram of the third interconnected state of the composite hot water supply system provided in the embodiments of this application; Figure 5 A schematic diagram of the fourth connection state of the composite hot water supply system provided in the embodiments of this application; Figure 6 A schematic diagram of the fifth connection state of the composite hot water supply system provided in the embodiments of this application; Figure 7 A schematic diagram of the sixth connection state of the composite hot water supply system provided in the embodiments of this application; Figure 8 This is a partial connection diagram of a composite hot water supply system provided in an embodiment of this application; Figure 9 Flowchart of the control method provided in the embodiments of this application Figure 1 ; Figure 10 Flowchart of the control method provided in the embodiments of this application Figure 2 ; Figure 11 Flowchart of the control method provided in the embodiments of this application Figure 3 ; Figure 12 Flowchart of the control method provided in the embodiments of this application Figure 4 .

[0026] Explanation of reference numerals in the attached figures: 1. Heat pump unit; 2. Photovoltaic heating device; 3. Electric heating device; 4. Heating water tank; 41. First liquid level detection element; 42. First temperature detection element; 5. Insulated water tank; 51. Second liquid level detection device; 52. Second temperature detection device; 6. Water supply terminal; 7. Piping assemblies; 71. First series branch; 72. Second series branch; 73. First circulating water circuit; 731. Seventh control valve; 732. Eighth control valve; 74. Second circulating water circuit; 741. Ninth control valve; 742. Tenth control valve; 75. Water tank inlet pipe; 751. First inlet branch; 752. Second inlet branch; 76. Water tank outlet pipe; 761. First outlet branch; 762. Second outlet branch; 77. Third series branch; 78. Water supply circulation pipe; 781. Eleventh control valve; 782. Third temperature sensor; 783. Pressure sensor; 79. Water replenishment pipe; 8. Control components; 81. Valve assembly unit; 811. First control valve; 812. Second control valve; 813. Third control valve; 814. Fourth control valve; 815. Fifth control valve; 816. Sixth control valve; 82. Pump assembly unit; 821. First circulating pump; 822. Second circulating pump; 823. First water supply pump; 824. Second water supply pump. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0029] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0030] To address the technical problem that existing hot water supply systems cannot maximize energy utilization while ensuring hot water demand, this application provides a composite hot water supply system and control method. This composite hot water supply system connects a heat pump unit 1 and a photovoltaic heating device 2 in parallel via a piping assembly 7, and then connects them in series with an electric heating device 3. The piping assembly 7 includes a first series branch 71 and a second series branch 72. The first series branch 71 is connected to the outlet of the heat pump unit 1 and the inlet of the photovoltaic heating device 2, respectively. The second series branch 72 is connected to the outlet of the photovoltaic heating device 2 and the inlet of the heat pump unit 1, respectively. This allows for the series connection between the heat pump unit 1 and the photovoltaic heating device 2. A control assembly 8 controls the flow direction of water within the piping assembly 7, enabling independent heating of the heat pump unit 1, the photovoltaic heating device 2, and the electric heating device 3; heating of any two in combination; and heating of all three in series. This allows for switching to the optimal operating mode based on operating conditions, maximizing energy utilization while ensuring hot water demand, and reducing the energy consumption of the composite hot water supply system.

[0031] Please see Figures 1 to 12 The first aspect of this application provides a composite hot water supply system, including a heat pump unit 1, a photovoltaic heating device 2, an electric heating device 3, a heating water tank 4, an insulated water tank 5, a water supply terminal 6, a piping assembly 7, and a control assembly 8. The piping assembly 7 is connected to the heat pump unit 1, the photovoltaic heating device 2, the electric heating device 3, the heating water tank 4, the insulated water tank 5, and the water supply terminal 6, respectively. Figure 1 As shown.

[0032] In this system, heat pump unit 1 heats the water flow through heat exchange with the air, photovoltaic heating device 2 heats the water flow in the pipe assembly 7 using solar energy, and electric heating device 3 heats the water flow in the pipe assembly 7 by converting electrical energy into heat energy. Existing mature products can be used. To maximize the utilization of renewable energy (i.e., solar energy), photovoltaic heating device 2 is prioritized for heating the water flow. When photovoltaic heating device 2 alone cannot meet the heating demand, heat pump unit 1 and / or electric heating device 3 are then activated for combined heating or independent heating.

[0033] The heating water tank 4 can hold hot water heated by one or more of the heat pump unit 1, photovoltaic heating device 2 and electric heating device 3. When the water temperature in the heating water tank 4 reaches the preset temperature, the water in the heating water tank 4 can be transported to the heat preservation water tank 5. The heat preservation water tank 5 is connected to the water supply terminal 6. When the water supply terminal 6 has a water demand, the hot water in the heat preservation water tank 5 can be transported to the water supply terminal 6.

[0034] The heat pump unit 1 and the photovoltaic heating device 2 are connected in parallel and then connected in series with the electric heating device 3. Both are connected to the inlet and outlet of the heating water tank 4. The heat pump unit 1 and the electric heating device 3 can be combined to heat hot water, or the photovoltaic heating device 2 and the electric heating device 3 can be used for heating. When the electric heating device 3 is not turned on, its internal pipes are normally open to avoid affecting the flow of water in the pipe assembly 7.

[0035] The piping assembly 7 includes a first series branch 71 and a second series branch 72. The first series branch 71 is connected to the outlet of the heat pump unit 1 and the inlet of the photovoltaic heating device 2, allowing water flowing through the heat pump unit 1 to flow into the photovoltaic heating device 2, thus achieving a first series connection between the heat pump unit 1 and the photovoltaic heating device 2. The second series branch 72 is connected to the outlet of the photovoltaic heating device 2 and the inlet of the heat pump unit 1, allowing water flowing through the photovoltaic heating device 2 to flow into the heat pump unit 1, thus achieving a second series connection between the heat pump unit 1 and the photovoltaic heating device 2. When the solar energy absorbed by the photovoltaic heating device 2 is insufficient to independently meet the heating demand, heating can be achieved by combining the photovoltaic heating device 2 with the heat pump unit 1. That is, preheating is done through one and then heating is done through the other, which can maximize the utilization of renewable energy (i.e., solar energy) and reduce the energy consumption of the composite hot water supply system.

[0036] The control component 8 includes a valve assembly unit 81 and a pump assembly unit 82. The control component 8 is mounted on the pipeline assembly 7 and is used to control the flow direction of water within the pipeline assembly 7. Specifically, the valve assembly unit 81 controls the on / off state of each section of the pipeline in the pipeline assembly 7, thereby controlling the flow path of the water. The pump assembly unit 82 provides power to the water flow, enabling the water to circulate within the connected pipelines, thus achieving the corresponding operating modes, such as... Figures 2 to 7 As shown in the figure (the arrows in the figure indicate the direction of water flow, solid lines represent connected pipes, and dashed lines represent disconnected pipes).

[0037] It should be noted that the heat pump unit 1 and the photovoltaic heating device 2 are connected in parallel and then connected in series with the electric heating device 3. When the photovoltaic heating device 2 or the heat pump unit 1 is heating independently, if the heating capacity does not meet the demand, the electric heating device 3 can be turned on for auxiliary heating to ensure the user's hot water supply needs.

[0038] When the photovoltaic heating device 2 cannot meet the heating demand by operating independently, the heat pump unit 1 and the photovoltaic heating device 2 can be connected in series through the first series branch 71 or the second series branch 72. For example, when the solar energy is strong, the heat pump unit 1 and the photovoltaic heating device 2 can be connected in series through the first series branch 71. The water first enters the heat pump unit 1 for preheating, and then enters the photovoltaic heating device 2 for heating. Figure 3 As shown. When solar energy is weak, the photovoltaic heating device 2 and the heat pump unit 1 can be connected in series through the second series branch 72. The water first enters the photovoltaic heating device 2 for preheating, and then enters the heat pump unit 1 for heating. Both methods can maximize the use of solar energy to increase the temperature of the water.

[0039] In some embodiments of this application, please refer to Figures 1 to 7 The piping assembly 7 also includes a first circulating water path 73 and a second circulating water path 74. The heat pump unit 1 is connected to the inlet and outlet of the heating water tank 4 through the first circulating water path 73. When the heat pump unit 1 operates independently, the first circulating water path 73 enables water to circulate between the heat pump unit 1 and the heating water tank 4. This allows the water in the heating water tank 4 to exchange heat with the heat pump unit 1 after flowing out, and then flow back into the heating water tank 4, thereby increasing the water temperature in the heating water tank 4. Figure 5 As shown.

[0040] The photovoltaic heating device 2 is connected to the inlet and outlet of the heating water tank 4 via the second circulating water channel 74. When the photovoltaic heating device 2 operates independently, the second circulating water channel 74 enables water to circulate between the photovoltaic heating device 2 and the heating water tank 4. This allows water flowing out of the heating water tank 4 to exchange heat with the photovoltaic heating device 2 before flowing back into the heating water tank 4, thereby increasing the water temperature in the heating water tank 4. Figure 2 As shown.

[0041] The first series branch 71 and the second series branch 72 are both connected to the first circulating water path 73 and the second circulating water path 74, respectively, enabling communication between the first circulating water path 73 and the second circulating water path 74. When the heat pump unit 1 and the photovoltaic heating device 2 are combined for composite heating, the water flowing out of the heating water tank 4 can first flow into the heat pump unit 1 through the first circulating water path 73, then flow into the photovoltaic heating device 2 through the first series branch 71, and finally flow back to the heating water tank 4 through the second circulating water path 74. Figure 3 As shown.

[0042] Alternatively, the water in the heating water tank 4 first flows into the photovoltaic heating device 2 through the second circulating water path 74, then flows through the photovoltaic heating device 2 into the heat pump unit 1 through the second series branch 72, and finally returns to the heating water tank 4 through the first circulating water path 73, as shown. Figure 4As shown.

[0043] The valve group unit 81 includes a first control valve 811 and a second control valve 812. The first control valve 811 is disposed on the first series branch 71 and is used to realize the on / off control of the first series branch 71. The second control valve 812 is disposed on the second series branch 72 and is used to realize the on / off control of the second series branch 72. It can realize the intelligent switching between parallel and series states between the heat pump unit 1 and the photovoltaic heating device 2.

[0044] In some embodiments of this application, please refer to Figure 3 and Figure 4 The first circulating water circuit 73 is equipped with a seventh control valve 731 and an eighth control valve 732. The seventh control valve 731 controls the on / off state of the outlet pipe in the first circulating circuit, and the eighth control valve 732 controls the on / off state of the inlet pipe in the first circulating circuit. The second circulating water circuit 74 is equipped with a ninth control valve 741 and a tenth control valve 742. The ninth control valve 741 controls the on / off state of the outlet pipe in the second circulating circuit, and the tenth control valve 742 controls the on / off state of the inlet pipe in the second circulating circuit. Figures 2 to 7 As shown.

[0045] It should be noted that the seventh control valve 731, the eighth control valve 732, the ninth control valve 741 and the tenth control valve 742 can be configured as part of the valve group unit 81 to jointly realize the flow direction control of water in the pipeline assembly 7.

[0046] In some embodiments of this application, please refer to Figures 1 to 7 The piping assembly 7 also includes a water tank inlet pipe 75. The inlet end of the water tank inlet pipe 75 is connected to the first circulating water path 73 and the second circulating water path 74, respectively, and can be used to receive hot water transported through the first circulating water path 73 or the second circulating water path 74. The outlet end of the water tank inlet pipe 75 is connected to the heating water tank 4 and the insulation water tank 5, respectively, and can transport hot water to the heating water tank 4 or the insulation water tank 5, thereby raising the water temperature of the heating water tank 4 or the insulation water tank 5.

[0047] It should be noted that, in the daily operation of this application, cold water is generally supplied to the heating water tank 4 through the water supply pipe 79. The water in the heating water tank 4 is then output to the photovoltaic heating device 2, heat pump unit 1, or electric heating device 3 for heating. The heated hot water is then transported to the heating water tank 4 through the water tank inlet pipe 75, and then water is supplied to the insulation water tank 5 through the heating water tank 4. Figure 7As shown, this avoids the mixing of hot and cold water in the insulated water tank 5 and prevents uneven temperature distribution inside the insulated water tank 5, thus ensuring a better user experience. Hot water is only directly supplied to the insulated water tank 5 through the water inlet pipe 75 in specific situations, such as when the water temperature in the insulated water tank 5 cannot be increased by heating the water tank 4.

[0048] In some embodiments of this application, please refer to Figures 1 to 7 The electric heating device 3 is installed on the water inlet pipe 75 of the water tank. If the water temperature does not reach the preset temperature requirement before the water flows into the heating water tank 4 or the heat preservation water tank 5, the electric heating device 3 can perform a final heating so that the hot water flowing into the heating water tank 4 or the heat preservation water tank 5 can meet the usage requirements and improve the reliability of the composite hot water supply system.

[0049] In some embodiments of this application, please refer to Figures 1 to 7 The water tank inlet pipe 75 includes a first inlet branch 751 and a second inlet branch 752. The first inlet branch 751 is connected to the heating water tank 4 and can deliver heated hot water to the heating water tank 4. Figures 2 to 5 As shown; the second water inlet branch 752 is connected to the insulated water tank 5, which can deliver heated hot water to the insulated water tank 5, as shown. Figure 6 and Figure 7 As shown.

[0050] The valve assembly unit 81 also includes a third control valve 813 and a fourth control valve 814. The third control valve 813 is installed on the first inlet branch 751 and is used to control the on / off state of the first inlet branch 751. The fourth control valve 814 is installed on the second inlet branch 752 and is used to control the on / off state of the second inlet branch 752, so that the heated hot water can enter different water tanks according to different operating conditions of the composite hot water supply system.

[0051] In some embodiments of this application, please refer to Figures 1 to 7 The piping assembly 7 also includes a water tank outlet pipe 76, the outlet end of which is connected to the first circulating water path 73 and the second circulating water path 74 respectively; the water tank outlet pipe 76 includes a first outlet branch 761 and a second outlet branch 762, the first outlet branch 761 is connected to the heating water tank 4 so as to output the water in the heating water tank 4 to the heat pump unit 1, the photovoltaic heating device 2 or the electric heating device 3 for heating, and the second outlet branch 762 is connected to the insulated water tank 5 so as to output the water in the insulated water tank 5 to the heat pump unit 1, the photovoltaic heating device 2 or the electric heating device 3 for heating.

[0052] The pump unit 82 includes a first circulation pump 821 and a second circulation pump 822. The first circulation pump 821 is installed on the first water outlet branch 761, and the second circulation pump 822 is installed on the second water outlet branch 762. It can drive the water flow so that the water flows in circulation during the heating process, thereby realizing heat exchange and temperature increase.

[0053] In some embodiments of this application, please refer to Figures 2 to 7 The first circulation pump 821 and the second circulation pump 822 are connected in parallel, so that the first circulation pump 821 and the second circulation pump 822 can serve as backups for each other. The valve group unit 81 also includes a fifth control valve 815, which is connected to the water inlet of the first circulation pump 821 and the second circulation pump 822 respectively, so as to realize the flow direction control of water flow and make water flow into the first circulation pump 821 or the second circulation pump 822. Specifically, when both the first circulation pump 821 and the second circulation pump 822 are functioning normally, the fifth control valve 815 remains closed, isolating the circulation pump of the heating water tank 4 from the circulation pump of the insulation water tank 5. When the first circulation pump 821 fails, and the water in the heating water tank 4 needs to be circulated for heating, the fifth control valve 815 can be opened, and the water flow in the heating water tank 4 can be circulated through the second circulation pump 822. Correspondingly, when the second circulation pump 822 fails, the fifth control valve 815 can be opened, and the water flow in the insulation water tank 5 can be circulated through the first circulation pump 821.

[0054] In some embodiments of this application, please refer to Figures 1 to 7 The piping assembly 7 also includes a third series branch 77, which is connected to the heating water tank 4 and the insulation water tank 5 respectively. The valve group unit 81 includes a sixth control valve 816, which is installed on the third series branch 77 and is used to control the on / off state of the third series branch 77. When the sixth control valve 816 is opened, the heating water tank 4 and the insulation water tank 5 are connected, which can connect the heating water tank 4, the third series branch 77 and the insulation water tank 5 to form a U-shaped pipe structure, maintain the water level balance of the heating water tank 4 and the insulation water tank 5, and avoid malfunctions such as water overflow.

[0055] It should be noted that, under normal circumstances, the sixth control valve 816 is kept closed to avoid unnecessary connection between the heating water tank 4 and the insulation water tank 5. The sixth control valve 816 is only opened in case of a malfunction. Therefore, the sixth control valve 816 is preferably set as a manual valve.

[0056] In some embodiments of this application, please refer to Figure 1 and Figure 8The piping assembly 7 also includes a water supply circulation pipe 78, which is connected to both the insulated water tank 5 and the water supply terminal 6. The water supply circulation pipe 78 can transport hot water from the insulated water tank 5 to the water supply terminal 6 for user use, and can also return unused hot water from the water supply terminal 6 back to the insulated water tank 5 for storage and insulation. Figure 8 As shown.

[0057] The pump unit 82 includes multiple water supply pumps connected in parallel in the water supply circulation pipeline 78, which can realize the redundancy design of the water supply pumps. When one of the water supply pumps fails, the supply of hot water can be maintained by other water supply pumps, which helps to improve the reliability of the composite hot water supply system.

[0058] As a specific example of this community, please refer to Figure 8 The water supply pipeline has a first water supply pump 823 and a second water supply pump 824 connected in parallel, with the two pumps serving as backups for each other. The water supply pipeline also includes an eleventh control valve 781, which can be used to control the on / off state of the hot water return pipeline. Furthermore, the water supply pipeline is equipped with a third temperature sensor 782 and a pressure sensor 783, used to detect the water temperature and pressure in the water supply pipeline.

[0059] In some embodiments of this application, please refer to Figures 1 to 8 The heating water tank 4 is equipped with a first liquid level detection element 41, and the heat preservation water tank 5 is equipped with a second liquid level detection element 51. The control component 8 is connected to the first liquid level detection element 41 and the second liquid level detection element 51 respectively, so as to realize the on-off control of the pipeline component 7 in a timely manner through the control component 8, thereby realizing the intelligent water replenishment operation of the heating water tank 4 and the heat preservation water tank 5.

[0060] In some embodiments of this application, please refer to Figures 1 to 8 The heating water tank 4 is also equipped with a first temperature detection element 42, and the insulated water tank 5 is also equipped with a second temperature detection element 52, which are used to detect the water temperature in the heating water tank 4 and the insulated water tank 5 respectively, so as to provide timely feedback on heating demand through temperature comparison, thereby heating the water in the heating water tank 4 or the insulated water tank 5 through the composite hot water supply system.

[0061] In the above embodiments, the control component 8 further includes a controller. The controller is signal-connected to each component in the composite hot water supply system, and can acquire and control the operating status of each component to achieve intelligent operation of the composite hot water supply system. The control valves in the valve group unit 81 can be set as electric valves (such as butterfly valves) to facilitate automatic control of each control valve through the controller. This allows the composite hot water supply system to select the appropriate working mode with optimal efficiency during operation, achieving the optimal energy-saving operating mode, ensuring efficient system operation, and improving the system's energy-saving rate.

[0062] Please see Figures 1 to 12 The second aspect of this application provides a control method applied to the composite hot water supply system described in the above embodiments, comprising the following steps: Step 1: After starting the combined hot water supply system, monitor the water temperature jt in heating tank 4 and the water temperature bt in insulated tank 5 to confirm whether there is a heating demand. Figure 9 and Figure 11 As shown.

[0063] In some embodiments of this application, the heating water tank 4 is preset with a first preset water temperature threshold jt0. When the water temperature jt in the heating water tank 4 is above the first preset water temperature threshold jt0, it is not necessary to heat the water in the heating water tank 4. The heat preservation water tank 5 is preset with a second preset water temperature threshold bt0. When the water temperature bt in the heat preservation water tank 5 is above the second preset water temperature threshold bt0, it is not necessary to heat the water in the heat preservation water tank 5.

[0064] When the water temperature bt in the insulated water tank 5 is less than the second set water temperature threshold bt0, hot water from the heating water tank 4 is preferentially introduced into the insulated water tank 5 through the pipeline assembly 7 to raise the water temperature in the insulated water tank 5. Figure 7 As shown.

[0065] If the water temperature jt in heating water tank 4 is less than the first set water temperature threshold jt0, and there is a water demand at the water supply terminal 6, then the water in the insulated water tank 5 will be directly heated through the composite hot water supply system to meet the immediate water supply requirements. Otherwise, the water in heating water tank 4 will be heated first through the composite hot water supply system.

[0066] Step 2: When there is a heating demand, the water flow is heated first through the photovoltaic heating device 2 to maximize the utilization of solar energy, and the outlet water temperature GT and outdoor temperature WT of the photovoltaic heating device 2 are monitored.

[0067] Step 3: Confirm the working mode of the composite hot water supply system based on the outlet water temperature GT of photovoltaic heating device 2 and the outdoor temperature WT; If the outlet water temperature GT of photovoltaic heating device 2 is greater than the first temperature threshold GT1, it indicates that the current solar radiation is sufficient to meet the heating demand. Therefore, the water can be heated solely by photovoltaic heating device 2, and the combined hot water supply system operates in photovoltaic independent heating mode. Figure 2 As shown.

[0068] If the first temperature threshold GT1 ≥ the outlet water temperature GT of the photovoltaic heating device 2 > the second temperature threshold GT2, and the outdoor temperature WT > the ambient temperature threshold WT1, it indicates that although the current solar radiation is high, it is difficult to meet the independent heating requirements by the photovoltaic heating device 2. It needs to be combined with other heating devices for heating. If the outdoor temperature WT > the ambient temperature threshold WT1, it indicates that the air temperature is high, and the water flow can be preheated by absorbing air energy through the heat pump unit 1. The working mode of the composite hot water supply system is the heat pump photovoltaic composite heating mode. Specifically, the water flow is first preheated by the heat pump unit 1, and then heated by the photovoltaic heating device 2. Figure 3 As shown.

[0069] If the second temperature threshold GT2 ≥ the outlet water temperature GT of photovoltaic heating device 2 > the third temperature threshold GT3, and the outdoor temperature WT > the ambient temperature threshold WT1, it indicates that although the current solar radiation is low, it can only preheat the water flow. However, if the outdoor temperature WT > the ambient temperature threshold WT1, it indicates that the air temperature is high, and the water flow can be heated by the heat pump unit 1 absorbing heat from the air. The working mode of the composite hot water supply system is a photovoltaic heat pump composite heating mode, specifically, the water flow is first preheated by the photovoltaic heating device 2, and then heated by the heat pump unit 1. Figure 4 As shown.

[0070] If the first temperature threshold GT1 ≥ the outlet water temperature GT of photovoltaic heating device 2 > the third temperature threshold GT3, and the outdoor temperature WT ≤ the ambient temperature threshold WT1, it indicates that it is difficult to meet the independent heating requirements by photovoltaic heating device 2. Furthermore, the outdoor temperature is low, and the energy efficiency of heating by heat pump unit 1 is low. Therefore, it is preferable to use a combination of electric heating device 3 and photovoltaic heating device 2 to achieve composite heating. The working mode of the composite hot water supply system is a photovoltaic-electric heating composite heating mode, and its pipeline connection status is as follows: Figure 1 As shown, the water flow first undergoes primary heating through photovoltaic heating device 2, and then secondary heating is achieved through electric heating device 3.

[0071] If the outlet water temperature GT of photovoltaic heating device 2 is less than or equal to the third temperature threshold GT3, then the effect of photovoltaic heating device 2 on raising the water temperature is limited. Furthermore, the outdoor temperature WT is greater than the ambient temperature threshold WT1, indicating a high outdoor temperature. In this case, the energy efficiency of independent operation of heat pump unit 1 for heating is higher. The working mode of the composite hot water supply system is independent heat pump heating mode. Figure 5 As shown.

[0072] If the outlet water temperature GT of the photovoltaic heating device 2 is less than or equal to the third temperature threshold GT3, and the outdoor temperature WT is less than or equal to the ambient temperature threshold WT1, the outdoor temperature is low. Therefore, the energy efficiency of heating through independent operation of the heat pump unit 1 is low. Independent heating can be achieved through the electric heating device 3. In this case, the working mode of the composite hot water supply system is the independent electric heating mode, and its connection status can be... Figure 2 or Figure 5 As shown in the diagram, the photovoltaic heating device 2 and the heat pump unit 1 are used only to achieve water flow.

[0073] It should be noted that the first temperature threshold GT1, the second temperature threshold GT2 and the third temperature threshold GT3 can be set according to parameters such as the first set water temperature threshold jt0 of the heating water tank 4, the temperature drop value of the water flow during the transmission process and the water replenishment temperature, so that the heated hot water flows into the heating water tank 4 and meets the set temperature requirements.

[0074] In some embodiments of this application, GT1 = jt0 + first set temperature difference Δt1, and the first set temperature difference Δt1 is greater than the temperature drop value of the water flow during the transmission process; GT2 = jt0 - second set temperature difference Δt2, and Δt2 ≥ 0℃; GT3 = water replenishment temperature BT + third set temperature difference Δt3, and Δt3 ≥ 0℃.

[0075] As a specific embodiment of this application, the outlet water temperature GT of the photovoltaic heating device 2 is 0℃≤GT≤90℃, and the values ​​of jt0, Δt1, Δt2, water replenishment temperature BT and Δt3 are between 0℃ and 60℃, which can be adjusted according to the actual situation.

[0076] Step 4: Control the operating status of heat pump unit 1, photovoltaic heating device 2, and electric heating device 3 according to the working mode of the composite hot water supply system, and control the water flow direction in pipeline assembly 7.

[0077] When the composite hot water supply system is in photovoltaic independent heating mode, the photovoltaic heating device 2 operates, the heat pump unit 1 does not operate, and the electric heating device 3 does not activate its heating function. If heating is required for the water in the heating tank 4, the ninth control valve 741, the third control valve 813, and the tenth control valve 742 are opened, and the first circulation pump 821 is then opened. The photovoltaic heating device 2 then heats the hot water independently until the water temperature jt in the heating tank 4 reaches jt0. Figure 2 As shown.

[0078] When the combined hot water supply system is in heat pump-photovoltaic combined heating mode, the heat pump unit 1 and photovoltaic heating device 2 are turned on, the electric heating device 3 is not activated, the first series branch 71 is opened, and the second series branch 72 is closed. Water flows through the heat pump unit 1 for preheating before entering the photovoltaic heating device 2 for heating. If heating water in the heating tank 4 is required, the first control valve 811, the ninth control valve 741, the third control valve 813, and the eighth control valve 732 are opened, followed by the first circulation pump 821. The replenishment water in the heating tank 4 first enters the heat pump unit 1 for preheating, then enters the photovoltaic heating device 2 for heating until the water temperature jt in the heating tank 4 reaches jt0. Figure 3 As shown.

[0079] When the combined hot water supply system is in photovoltaic heat pump combined heating mode, the heat pump unit 1 and photovoltaic heating device 2 are turned on, the electric heating device 3 is not activated, the first series branch 71 is closed, and the second series branch 72 is opened. The water flows through the photovoltaic heating device 2 for preheating before entering the heat pump unit 1 for heating. If the water in the heating tank 4 is to be heated, the tenth control valve 742, the second control valve 812, the seventh control valve 731, and the third control valve 813 are opened, and then the first circulation pump 821 is turned on. The replenishment water in the heating tank 4 first enters the photovoltaic heating device 2 for preheating, and then enters the heat pump unit 1 for heating until the water temperature jt in the heating tank 4 reaches jt0. Figure 4 As shown.

[0080] When the combined hot water supply system operates in a photovoltaic and electric heating combined heating mode, the photovoltaic heating device 2 and the electric heating device 3 are activated, while the first series branch 71 and the second series branch 72 are both closed. Water flows sequentially through the photovoltaic heating device 2 and the electric heating device 3, achieving two-stage heating of the water. If heating is required in the heating tank 4, the ninth control valve 741, the third control valve 813, and the tenth control valve 742 are opened, and then the first circulation pump 821 is activated. Hot water is then heated sequentially through the photovoltaic heating device 2 and the electric heating device 3 until the water temperature jt in the heating tank 4 reaches jt0. Figure 2 As shown.

[0081] When the combined hot water supply system operates in heat pump independent heating mode, heat pump unit 1 is turned on, photovoltaic heating device 2 is not running, and electric heating device 3 is not activating its heating function. The water flow is independently heated by heat pump unit 1. If heating is required for the water in heating tank 4, the seventh control valve 731, the third control valve 813, and the eighth control valve 732 are opened, followed by the first circulation pump 821. The hot water is then independently heated by heat pump unit 1 until the water temperature jt in heating tank 4 reaches jt0. Figure 5 As shown.

[0082] When the combined hot water supply system operates in independent electric heating mode, if the water in the heating tank 4 is to be heated, the electric heating device 3 is turned on, and either the first circulating water path 73 or the second circulating water path 74 is opened, thus establishing a connection between the electric heating device 3 and the heating tank 4. This connection can be... Figure 2 or Figure 5 Any one of them can achieve independent heating function through electric heating device 3 until the water temperature jt in heating water tank 4 reaches jt0, which is suitable for hot water supply at night in extremely cold regions during winter.

[0083] It should be noted that the above working mode can also be used to heat the water in the insulated water tank 5 to achieve the purpose of keeping the water in the insulated water tank 5 warm. The difference is that instead of opening the third control valve 813 and running the first circulation pump 821, the fourth control valve 814 is opened and the second circulation pump 822 is run. Figure 6 As shown ( Figure 6 (This illustration shows the use of an independent photovoltaic heating mode to raise the water temperature in the insulated water tank 5, which will not be elaborated further here.)

[0084] In the above working mode, before the heat pump unit 1 is run, the optimal operating frequency of the heat pump unit 1 is set in advance. When the heat pump unit 1 is turned on (such as when the heat pump photovoltaic composite heating mode, photovoltaic heat pump composite heating mode, heat pump independent heating mode, etc. are running), it runs at the optimal operating frequency. After the preset running time, the water temperature jt of the heating water tank 4 is monitored. If jt < the first set water temperature threshold jt0, the number of main units of the heat pump unit 1 and the operating frequency are increased to increase the outlet water temperature of the heat pump unit 1 until the water temperature jt of the heating water tank 4 reaches the set temperature requirement.

[0085] When the number of main units operating and the operating frequency of heat pump unit 1 reach their upper limits, if jt < the first set water temperature threshold jt0, and the heating demand is still not met, then electric heating device 3 is activated for auxiliary heating. This achieves combined heating of heat pump unit 1, photovoltaic heating device 2, and electric heating device 3 based on either heat pump photovoltaic combined heating mode or photovoltaic heat pump combined heating mode; or it achieves combined heating of heat pump unit 1 and electric heating device 3 based on heat pump unit 1's independent heating mode. After activating electric heating device 3, the heating level of electric heating device 3 can be gradually increased until the water temperature in heating water tank 4 meets the requirements.

[0086] It should be noted that during the process of increasing the number and frequency of operation of the main unit of heat pump unit 1, if the water temperature jt of the heating water tank 4 is greater than jt0 + the fourth set temperature difference Δt4, and 0℃≤Δt4≤60℃, it indicates that there is excess heat generated by heat pump unit 1. The number and frequency of operation of the main unit of heat pump unit 1 can be reduced to avoid excessive heating due to excessive temperature of heating water tank 4 and to avoid excess energy consumption.

[0087] During the aforementioned circulating heating process, it is also necessary to adaptively adjust the preset liquid level thresholds of the heating water tank 4 and the insulation water tank 5 according to the user's hot water usage patterns and the intensity of solar energy. This ensures the hot water demand while maximizing the utilization of renewable energy, ultimately improving the economic efficiency of the composite hot water supply system, as detailed below: First, the number of times N is replenished to the insulated water tank 5 within the preset water supply time period is obtained. Specifically, the preset water supply time period can be a fixed time period such as 24 hours or 48 hours. In this embodiment, 24 hours is preferred as the preset water supply time period.

[0088] Next, the preset liquid level threshold JY0 of the heating water tank 4 and the preset liquid level threshold BY0 of the insulation water tank 5 are obtained. These are the initial preset liquid levels when the composite hot water supply system is started each time. Specifically, they are the preset liquid level thresholds of the heating water tank 4 and the insulation water tank 5 when the system was last shut down. If the composite hot water supply system is running for the first time, the initial liquid level thresholds are the ones set at the factory.

[0089] It should be noted that, in order to ensure the reliability of water replenishment from the heating water tank 4 to the insulation water tank 5, when the actual liquid level of the heating water tank 4 is at the preset liquid level threshold JY0 and the actual liquid level of the insulation water tank 5 is at the preset liquid level threshold BY0, the water volume in the heating water tank 4 is greater than the water volume in the insulation water tank 5. Preferably, the water volume in the heating water tank 4 is more than three times the water volume in the insulation water tank 5.

[0090] Next, the preset liquid level threshold BY0 of the insulated water tank 5 is adjusted according to the number of water replenishments N. The number of water replenishments within the preset water supply period can be compared with the water replenishment threshold N0. N0 can be obtained based on the recent water replenishment situation of the insulated water tank 5.

[0091] Specifically, the number of water replenishments in the previous 24 hours (i.e., yesterday) is denoted as N, and the number of water replenishments from the previous 24 hours to the previous 48 hours (i.e., the day before yesterday) is denoted as N0. When N > N0, it indicates that the user's water consumption increased yesterday. In order to reduce the number of water replenishments to the insulated water tank 5, the preset liquid level threshold BY0 of the insulated water tank 5 is increased, for example, by one level. When N0-x ≤ N ≤ N0, it indicates that the number of water replenishments yesterday is close to the number of water replenishments the day before yesterday, and the preset liquid level threshold BY0 can be kept unchanged. When N < N0-x (x can be set to a constant greater than 1 according to the actual situation), it indicates that the number of water replenishments yesterday has decreased significantly compared to the number of water replenishments the day before yesterday. The preset liquid level threshold BY0 can be decreased, for example, by one level, to avoid increasing the energy consumption of the composite hot water supply system when the water in the insulated water tank 5 needs to be circulated, heated and kept warm.

[0092] After the preset liquid level threshold BY0 of the insulated water tank 5 is adjusted, the water level of the insulated water tank 5 will be controlled based on the adjusted preset liquid level threshold BY0 for the subsequent water supply period (e.g., the next 24 hours). This allows the preset liquid level threshold of the insulated water tank 5 to be set according to the user's heating demand, resulting in a higher degree of load matching. It should be noted that during the adaptive adjustment of the preset liquid level threshold BY0, it will not fall below the minimum water level limit of the insulated water tank 5, nor will it exceed the maximum water level limit of the insulated water tank 5.

[0093] At the same time, the preset liquid level threshold JY0 of the heating water tank 4 is adjusted according to the outlet water temperature of the photovoltaic heating device 2. When GT > GT0, it indicates that the solar energy is sufficient. The preset liquid level threshold JY0 of the heating water tank 4 can be increased, for example, by one level. The water storage capacity inside the heating water tank 4 is increased through the water supply pipe 79, and the water in the heating water tank 4 flows through the photovoltaic heating device 2. The heat storage of the heating water tank 4 can be achieved by utilizing solar energy.

[0094] It should be noted that GT0 can be set according to the actual situation, preferably GT0 > GT1. When there is a surplus of solar energy, the preset liquid level threshold JY0 of the heating water tank 4 can be increased, thereby increasing the amount of water flowing through the photovoltaic heating device 2 and maximizing the storage of surplus solar energy by utilizing the water in the heating water tank 4.

[0095] During subsequent water supply periods, when the outlet water temperature GT of the photovoltaic heating device 2 is less than GT3, the preset liquid level threshold JY0 of the heating water tank 4 can be lowered, for example, by one level, to reduce the energy consumption when heating the hot water in the heating water tank 4 through the heat pump unit 1 and the electric heating device 3.

[0096] After the preset liquid level threshold JY0 of the heating water tank 4 is adjusted, the water level of the heating water tank 4 will be controlled based on the adjusted preset liquid level threshold JY0 for the subsequent water supply period (e.g., the next 24 hours). It should be noted that during the adaptive adjustment of the preset liquid level threshold JY0 of the heating water tank 4, it will not be lower than the minimum water level limit of the heating water tank 4, nor higher than the maximum water level limit of the heating water tank 4.

[0097] Finally, monitor the current liquid level JY of the heating water tank 4 and the current liquid level BY of the insulation water tank 5; and confirm the replenishment of water to the heating water tank 4 according to the preset liquid level threshold JY0 and the current liquid level JY; confirm the replenishment of water to the insulation water tank 5 according to the preset liquid level threshold BY0 and the current liquid level BY, so that the liquid level JY of the heating water tank 4 reaches JY0 before heating, and the liquid level BY of the insulation water tank 5 reaches BY0 before heating, thereby ensuring that the water tank temperature and liquid level after heating meet the hot water supply requirements.

[0098] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0099] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0100] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A composite hot water supply system, characterized in that, include: Heat pump unit (1); Photovoltaic heating device (2); Electric heating device (3); Heating water tank (4); Insulated water tank (5); Water supply terminal (6); Piping assembly (7) is connected to the heat pump unit (1), the photovoltaic heating device (2), the electric heating device (3), the heating water tank (4), the insulated water tank (5), and the water supply terminal (6). The heat pump unit (1) and the photovoltaic heating device (2) are connected in parallel and then connected in series with the electric heating device (3), and both are connected to the inlet and outlet of the heating water tank (4). The piping assembly (7) includes a first series branch (71) and a second series branch (72). The first series branch (71) is connected to the outlet of the heat pump unit (1) and the inlet of the photovoltaic heating device (2), and the second series branch (72) is connected to the outlet of the photovoltaic heating device (2) and the inlet of the heat pump unit (1). The control component (8) includes a valve group unit (81) and a pump group unit (82). The control component (8) is disposed on the pipeline assembly (7) and is used to control the flow direction of water in the pipeline assembly (7).

2. The composite hot water supply system according to claim 1, characterized in that, The pipeline assembly (7) further includes a first circulating water path (73) and a second circulating water path (74). The heat pump unit (1) is connected to the heating water tank (4) through the first circulating water path (73). The photovoltaic heating device (2) is connected to the heating water tank (4) through the second circulating water path (74). The first series branch (71) and the second series branch (72) are respectively connected to the first circulating water path (73) and the second circulating water path (74). The valve group unit (81) includes a first control valve (811) and a second control valve (812). The first control valve (811) is disposed on the first series branch (71) and is used to realize the on / off control of the first series branch (71). The second control valve (812) is disposed on the second series branch (72) and is used to realize the on / off control of the second series branch (72).

3. The composite hot water supply system according to claim 2, characterized in that, The pipeline assembly (7) also includes a water tank inlet pipeline (75), the inlet end of which is connected to the first circulating water path (73) and the second circulating water path (74) respectively; the outlet end of the water tank inlet pipeline (75) is connected to the heating water tank (4) and the heat preservation water tank (5) respectively.

4. The composite hot water supply system according to claim 3, characterized in that, The electric heating device (3) is installed on the water inlet pipe (75) of the water tank.

5. The composite hot water supply system according to claim 3, characterized in that, The water tank inlet pipe (75) includes a first inlet branch (751) and a second inlet branch (752). The first inlet branch (751) is connected to the heating water tank (4), and the second inlet branch (752) is connected to the heat preservation water tank (5). The valve group unit (81) further includes a third control valve (813) and a fourth control valve (814). The third control valve (813) is disposed on the first water inlet branch (751) and is used to realize the on / off control of the first water inlet branch (751). The fourth control valve (814) is disposed on the second water inlet branch (752) and is used to realize the on / off control of the second water inlet branch (752).

6. The composite hot water supply system according to claim 3, characterized in that, The pipeline assembly (7) further includes a water tank outlet pipeline (76), the outlet end of which is connected to the first circulating water path (73) and the second circulating water path (74) respectively; the water tank outlet pipeline (76) includes a first outlet branch (761) and a second outlet branch (762), the first outlet branch (761) is connected to the heating water tank (4), and the second outlet branch (762) is connected to the heat preservation water tank (5); The pump unit (82) includes a first circulation pump (821) and a second circulation pump (822). The first circulation pump (821) is installed on the first outlet branch (761), and the second circulation pump (822) is installed on the second outlet branch (762).

7. The composite hot water supply system according to claim 6, characterized in that, The first circulating pump (821) and the second circulating pump (822) are connected in parallel. The valve group unit (81) further includes a fifth control valve (815), which is connected to the water inlet of the first circulating pump (821) and the second circulating pump (822) respectively.

8. The composite hot water supply system according to claim 3, characterized in that, The pipeline assembly (7) also includes a third series branch (77), which is connected to the heating water tank (4) and the heat preservation water tank (5) respectively; The valve group unit (81) includes a sixth control valve (816), which is disposed on the third series branch (77) and is used to realize the on / off control of the third series branch (77).

9. The composite hot water supply system according to any one of claims 1 to 8, characterized in that, The pipeline assembly (7) also includes a water supply circulation pipeline (78), which is connected to the insulated water tank (5) and the water supply terminal (6) respectively; The pump unit (82) includes multiple water supply pumps connected in parallel in the water supply circulation pipeline (78).

10. The composite hot water supply system according to any one of claims 1 to 8, characterized in that, The heating water tank (4) is provided with a first liquid level detection device (41), and the heat preservation water tank (5) is provided with a second liquid level detection device (51). The control component (8) is connected to the first liquid level detection device (41) and the second liquid level detection device (51) respectively.

11. A control method, characterized in that, The system is applied to the combined hot water supply system as described in any one of claims 1 to 10, comprising the following steps: Monitor the outlet water temperature and outdoor temperature of the photovoltaic heating device (2); The working mode of the composite hot water supply system is determined based on the outlet water temperature of the photovoltaic heating device (2) and the outdoor temperature. The operating status of the heat pump unit (1), the photovoltaic heating device (2), and the electric heating device (3) are controlled according to the working mode of the composite hot water supply system, and the water flow direction in the pipeline assembly (7) is controlled.

12. The control method according to claim 11, characterized in that, The operating modes of the composite hot water supply system are determined based on the outlet water temperature of the photovoltaic heating device (2) and the outdoor temperature, including: If the outlet water temperature GT of the photovoltaic heating device (2) is greater than the first temperature threshold GT1, the working mode of the composite hot water supply system is the photovoltaic independent heating mode; If the first temperature threshold GT1 ≥ the outlet water temperature GT of the photovoltaic heating device (2) > the second temperature threshold GT2, and the outdoor temperature WT > the ambient temperature threshold WT1, the working mode of the composite hot water supply system is the heat pump photovoltaic composite heating mode. If the second temperature threshold GT2 ≥ the outlet water temperature GT of the photovoltaic heating device (2) > the third temperature threshold GT3, and the outdoor temperature WT > the ambient temperature threshold WT1, the working mode of the composite hot water supply system is the photovoltaic heat pump composite heating mode. If the first temperature threshold GT1 ≥ the outlet water temperature GT of the photovoltaic heating device (2) > the third temperature threshold GT3, and the outdoor temperature WT ≤ the ambient temperature threshold WT1, the working mode of the composite hot water supply system is the photovoltaic electric heating composite heating mode. If the outlet water temperature GT of the photovoltaic heating device (2) is less than or equal to the third temperature threshold GT3, and the outdoor temperature WT is greater than the ambient temperature threshold WT1, the working mode of the composite hot water supply system is the independent heating mode of the heat pump. If the outlet water temperature GT of the photovoltaic heating device (2) is less than or equal to the third temperature threshold GT3, and the outdoor temperature WT is less than or equal to the ambient temperature threshold WT1, the working mode of the composite hot water supply system is the electric heating independent heating mode.

13. The control method according to claim 12, characterized in that, The operating status of the heat pump unit (1), the photovoltaic heating device (2), and the electric heating device (3) are controlled according to the working mode of the composite hot water supply system; and the water flow direction in the pipeline assembly (7) is controlled, including: When the composite hot water supply system is in heat pump photovoltaic composite heating mode, the heat pump unit (1) and the photovoltaic heating device (2) are turned on, the first series branch (71) is opened, the second series branch (72) is closed, and the water flows through the heat pump unit (1) for preheating and then enters the photovoltaic heating device (2) for heating. When the composite hot water supply system is in photovoltaic heat pump composite heating mode, the heat pump unit (1) and the photovoltaic heating device (2) are turned on, the first series branch (71) is closed, the second series branch (72) is opened, and the water flows through the photovoltaic heating device (2) for preheating before entering the heat pump unit (1) for heating. When the composite hot water supply system is in a photovoltaic and electric heating composite heating mode, the photovoltaic heating device (2) and the electric heating device (3) are turned on, the first series branch (71) and the second series branch (72) are both turned off, and the water flows through the photovoltaic heating device (2) and the electric heating device (3) in sequence.

14. The control method according to claim 12, characterized in that, It also includes the following steps: The optimal operating frequency of the heat pump unit (1) is set, and the heat pump unit (1) operates at the optimal operating frequency when it is turned on. Monitor the water temperature jt of the heating water tank (4). If jt < the first set water temperature threshold jt0, increase the number of main units and the operating frequency of the heat pump unit (1). When the number of main units and the operating frequency of the heat pump unit (1) both reach the upper limit, if jt < the first set water temperature threshold jt0, then the electric heating device (3) is turned on.

15. The control method according to any one of claims 11 to 14, characterized in that, It also includes the following steps: Obtain the number of times N is replenished to the insulated water tank (5) within a preset water supply time period; Obtain the preset liquid level threshold JY0 of the heating water tank (4) and the preset liquid level threshold BY0 of the heat preservation water tank (5); The preset liquid level threshold BY0 of the heat preservation water tank (5) is adjusted according to the number of water replenishment N, and the preset liquid level threshold JY0 of the heating water tank (4) is adjusted according to the outlet water temperature of the photovoltaic heating device (2). Monitor the current liquid level JY of the heating water tank (4) and the current liquid level BY of the heat preservation water tank (5); Based on the preset liquid level threshold JY0 and the current liquid level JY of the heating water tank (4), water is replenished to the heating water tank (4); Based on the preset liquid level threshold BY0 and the current liquid level BY of the insulated water tank (5), water is replenished to the insulated water tank (5).

Images