Coupling system utilizing low-temperature water waste heat and solar energy to supply heat synergistically

Abstract

The invention discloses a coupling system utilizing low-temperature water waste heat and solar energy to supply heat synergistically, which comprises a solar heater, one end of the solar heater is fixedly connected with a low-temperature water inlet pipe, and one end, far away from the low-temperature water inlet pipe, of the solar heater is fixedly connected with a low-temperature water outlet pipe. And one end of the low-temperature water outlet pipe is fixedly connected with an electric heat pump. According to the coupling system for cooperative heat supply through the low-temperature water waste heat and the solar energy, low-temperature water is preheated through the solar heater so that the temperature of the low-temperature water can be increased, the preheated low-temperature water enters the electric heating pump to conduct heat exchange with intermediate water, the low-temperature water is preheated through the solar energy, and the electric heat exchange efficiency is improved; the low-temperature water and the intermediate water after heat exchange still have higher temperature, and the low-temperature water and the intermediate water with higher temperature can be used as industrial water of plants and domestic water of dormitories, so that the recycling efficiency of the low-temperature water is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of low-temperature water waste heat recovery, and in particular to a coupling system for collaborative heating using low-temperature water waste heat and solar energy. Background Art

[0002] Low-temperature water waste heat mainly includes urban water, industrial wastewater and production cooling water. In order to achieve the goal of green environmental protection, industrial plants are equipped with sewage treatment equipment. The low-temperature water produced after sewage treatment has a high recycling value. Its recycling value is mainly reflected in three aspects: energy conservation and emission reduction, economic benefits and environmental benefits:

[0003] Energy conservation and emission reduction are key benefits of low-temperature waste heat recovery. Low-temperature wastewater recovery equipment utilizes low-temperature evaporation technology to reduce energy consumption by lowering the evaporation temperature. Compared to traditional high-temperature evaporation equipment, energy consumption can be reduced by 30%-50%. This technology not only reduces a company's use of fresh water but also reduces energy costs by recycling heat from wastewater, achieving a win-win situation for both energy conservation and environmental protection. Furthermore, low-temperature waste heat recovery technology can replace high-quality heat sources, reducing energy consumption, improving power generation efficiency, and minimizing energy waste.

[0004] 2. Significant economic benefits. Low-temperature waste heat recovery technology is widely used in a variety of industries, including chemical, metallurgy, and building materials. It can recycle waste heat generated during production to preheat raw materials, drive steam turbines for power generation, and more, thereby reducing production costs and improving energy efficiency. For example, in the printing and dyeing industry, low-temperature wastewater recovery equipment can utilize industrial waste heat or low-grade heat sources for wastewater treatment, reducing energy costs.

[0005] 3. Environmental benefits cannot be ignored. Low-temperature wastewater recovery equipment can effectively separate and concentrate pollutants in wastewater during the treatment process, reducing the emission of harmful gases, minimizing potential damage to soil and water bodies, and promoting the sustainable recycling of water resources. In addition, low-temperature water waste heat recovery technology can improve power generation efficiency and reduce greenhouse gas emissions, which has positive significance for environmental protection.

[0006] Waste heat recovery from low-temperature water is achieved through an electric heat pump, which uses intermediate water for heat exchange. The basic principle of this system is to utilize the reverse Carnot cycle, transferring heat through components such as the compressor, condenser, expansion valve, and evaporator. Specifically, the system uses intermediate water to create a closed loop between the sewage heat exchanger and the heat pump unit, transferring heat.

[0007] The existing sewage waste heat recovery device solely uses an electric heat pump to recover the waste heat in low-temperature water. The heat energy contained in low-temperature water is limited, generally maintained at 10-40°C. The efficiency of the electric heat pump in heating low-temperature water during operation is limited. When heated to a certain temperature, the electric heat pump loses a large amount of electricity resources. Therefore, the efficiency of recovering and reusing the waste heat in low-temperature water during the heat exchange process is low.

[0008] To this end, the present invention provides a coupling system that utilizes the waste heat of low-temperature water and solar energy for synergistic heating. The low-temperature water is preheated by the renewable resource of the solar heater to increase the temperature of the low-temperature water. The preheated low-temperature water then enters the electric heat pump for heat exchange, thereby improving the efficiency of the electric heat pump in recovering and reusing the waste heat of the low-temperature water while saving electricity resources. In addition, the solar energy heat generation method is used to improve the overall heating efficiency of the low-temperature water to solve the above-mentioned problems. Summary of the Invention

[0009] In view of the shortcomings of the existing technology, the present invention provides a coupling system that utilizes low-temperature water waste heat and solar energy for synergistic heating, which solves the above problems.

[0010] To achieve the above objectives, the present invention is implemented through the following technical solutions: a coupled system for synergistically providing heat using waste heat from low-temperature water and solar energy, comprising a solar heater, one end of the solar heater being fixedly connected to a low-temperature water inlet pipe, an end of the solar heater away from the low-temperature water inlet pipe being fixedly connected to a low-temperature water outlet pipe, and one end of the low-temperature water outlet pipe being fixedly connected to an electric heat pump;

[0011] One side of the electric heat pump is fixedly connected to an intermediate water inlet pipe, and the side of the electric heat pump away from the intermediate water inlet pipe is fixedly connected to an intermediate water outlet pipe, the intermediate water inlet pipe is arranged on the upper side of the intermediate water outlet pipe, and the outer end of the intermediate water outlet pipe is fixedly connected to a storage tank;

[0012] The outer side of the electric heat pump is fixedly connected to a low-temperature water guide pipe, the outer end of the low-temperature water guide pipe is fixedly connected to a low-temperature water drainage shunt pipe, one output end of the low-temperature water drainage shunt pipe is fixedly connected to a low-temperature water outlet pipe A, and the outer end of the low-temperature water outlet pipe A is fixedly connected to a factory building;

[0013] The output end on the other side of the low-temperature water drainage shunt pipe is fixedly connected to a low-temperature water outlet pipe B, and the outer end of the low-temperature water outlet pipe B is fixedly connected to a dormitory.

[0014] Preferably, one end of the storage tank away from the intermediate water outlet pipe is fixedly connected to an intermediate water drainage shunt pipe, one output end of the intermediate water drainage shunt pipe is fixedly connected to an intermediate water outlet pipe A, and one end of the intermediate water outlet pipe A is connected to the factory building;

[0015] The output end on the other side of the intermediate water drainage diversion pipe is fixedly connected to the intermediate water outgoing pipe B, and one end of the intermediate water outgoing pipe B is connected to the dormitory.

[0016] Preferably, one end of the low-temperature water inlet pipe is fixedly connected to a filter tank, the outer end of the low-temperature water inlet pipe is fixedly connected to a water pump A and a solenoid valve A, and the outer end of the low-temperature water outlet pipe is fixedly connected to a water pump B and a solenoid valve B.

[0017] Preferably, the outer end of the intermediate water inlet pipe is fixedly connected to a solenoid valve C, and the outer end of the low-temperature water guide pipe is fixedly connected to a water pump D.

[0018] Preferably, the outer end of the low-temperature water outlet pipe A is fixedly connected to a solenoid valve D, and the outer end of the low-temperature water outlet pipe B is fixedly connected to a solenoid valve E.

[0019] Preferably, the outer end of the intermediate water diversion diversion pipe is fixedly connected to a water pump E, the outer end of the intermediate water outlet pipe A is fixedly connected to a solenoid valve F, and the outer end of the intermediate water outlet pipe B is fixedly connected to a solenoid valve G.

[0020] Preferably, the outer end of the plant is fixedly connected to a sewage drainage diversion pipe, one output end of the sewage drainage diversion pipe is fixedly connected to a sewage drainage pipe A, and the outer end of the sewage drainage pipe A is fixedly connected to a solenoid valve H and a water pump F;

[0021] The output end of the other side of the sewage drainage diversion pipe is fixedly connected to the sewage drainage pipe B, and the outer end of the sewage drainage pipe B is fixedly connected to the solenoid valve I and the water pump G;

[0022] One end of the filter tank away from the low-temperature water inlet pipe is fixedly connected to a low-temperature water connecting pipe, and the sewage discharge pipe B is fixedly connected to the low-temperature water connecting pipe.

[0023] Preferably, the outer end of the dormitory is fixedly connected to a wastewater pipe, and the outer end of the wastewater pipe is fixedly connected to a water pump H.

[0024] Beneficial effects

[0025] The present invention provides a coupled system that utilizes waste heat from low-temperature water and solar energy for synergistic heating. Compared with existing technologies, it has the following advantages:

[0026] This coupling system that utilizes the waste heat of low-temperature water and solar energy for collaborative heating preheats the low-temperature water through a solar heater to increase the temperature of the low-temperature water. The preheated low-temperature water enters the electric heat pump for heat exchange with intermediate water. The low-temperature water is preheated using solar energy to improve the efficiency of the electric heat exchange. The low-temperature water and intermediate water after the heat exchange still have a relatively high temperature. The low-temperature water and intermediate water with a relatively high temperature can be used for industrial water in the factory and domestic water in the dormitory, thereby improving the efficiency of low-temperature water recovery and reuse.

[0027] This coupling system uses the waste heat of low-temperature water and solar energy for synergistic heating. The low-temperature water is exposed to the sun through a solar heater. The ultraviolet rays inside the sun have a sterilizing effect on the low-temperature water. The low-temperature water after treatment has a wide range of uses. The low-temperature water after exposure is mainly used for landscape watering, road sprinkling, green space irrigation and construction sites. It can also be used as industrial water, further improving the utilization efficiency of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention.

[0029] Among them: 1. Solar heater; 2. Low-temperature water inlet pipe; 3. Low-temperature water outlet pipe; 4. Electric heat pump;

[0030] 5. Intermediate water inlet pipe; 6. Intermediate water outlet pipe; 7. Storage tank;

[0031] 8. Low-temperature water diversion pipe; 9. Low-temperature water diversion shunt pipe; 10. Low-temperature water outlet pipe A;

[0032] 11. Factory building; 12. Low-temperature water outlet pipe B; 13. Dormitory;

[0033] 14. Intermediate water diversion pipe; 15. Intermediate water outlet pipe A; 16. Intermediate water outlet pipe B;

[0034] 17. Filter tank; 18. Water pump A; 19. Solenoid valve A;

[0035] 20. Water pump B; 21. Solenoid valve B; 22. Solenoid valve C;

[0036] 23. Water pump D; 24. Solenoid valve D; 25. Solenoid valve E;

[0037] 26. Water pump E; 27. Solenoid valve F; 28. Solenoid valve G;

[0038] 29. Sewage drainage diversion pipe; 30. Sewage drainage pipe A; 31. Solenoid valve H; 32. Water pump F;

[0039] 33. Sewage discharge pipe B; 34. Solenoid valve I; 35. Water pump G;

[0040] 36. Wastewater pipe; 37. Water pump H; 38. Low-temperature water connecting pipe. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] Example 1:

[0043] See also Figure 1 A coupled system for synergistically providing heat using waste heat from low-temperature water and solar energy comprises a solar heater 1, one end of the solar heater 1 being fixedly connected to a low-temperature water inlet pipe 2, an end of the solar heater 1 away from the low-temperature water inlet pipe 2 being fixedly connected to a low-temperature water outlet pipe 3, and one end of the low-temperature water outlet pipe 3 being fixedly connected to an electric heat pump 4;

[0044] One side of the electric heat pump 4 is fixedly connected to an intermediate water inlet pipe 5, and the side of the electric heat pump 4 away from the intermediate water inlet pipe 5 is fixedly connected to an intermediate water outlet pipe 6. The intermediate water inlet pipe 5 is arranged on the upper side of the intermediate water outlet pipe 6, and the outer end of the intermediate water outlet pipe 6 is fixedly connected to a storage tank 7;

[0045] The outside of the electric heat pump 4 is fixedly connected to a low-temperature water guide pipe 8, the outer end of the low-temperature water guide pipe 8 is fixedly connected to a low-temperature water drainage shunt pipe 9, one output end of the low-temperature water drainage shunt pipe 9 is fixedly connected to a low-temperature water outlet pipe A10, and the outer end of the low-temperature water outlet pipe A10 is fixedly connected to a plant 11;

[0046] The other output end of the low-temperature water diversion pipe 9 is fixedly connected to the low-temperature water outlet pipe B12, and the outer end of the low-temperature water outlet pipe B12 is fixedly connected to the dormitory 13;

[0047] One end of the low-temperature water inlet pipe 2 is fixedly connected to the filter tank 17, the outer end of the low-temperature water inlet pipe 2 is fixedly connected to the water pump A18 and the solenoid valve A19, and the outer end of the low-temperature water outlet pipe 3 is fixedly connected to the water pump B20 and the solenoid valve B21.

[0048] In some examples, during the preheating process of low-temperature water, the water pump A18 and the solenoid valve A19 are turned on, and the solenoid valve B21 is closed. The low-temperature water enters the solar heater 1 through the low-temperature water inlet pipe 2 for preheating to increase the temperature of the low-temperature water. While the low-temperature water enters the solar heater 1, the ultraviolet rays of the solar energy are used to disinfect and sterilize the low-temperature water. After the low-temperature water is heated by the solar heater 1, the water pump A18 and the solenoid valve A19 are turned off, and the water pump B20 and the solenoid valve B21 are turned on. The low-temperature water inside the solar heater 1 enters the electric heat pump 4 from the low-temperature water outlet pipe 3. At the same time, the intermediate Water enters the electric heat pump 4 from the intermediate water inlet pipe 5 and completes heat exchange with the low-temperature water. During the heat exchange process, the temperature of the low-temperature water is transferred to the intermediate water, so that the temperature of the low-temperature water and the intermediate water are balanced. The intermediate water after heat exchange enters the storage tank 7 from the intermediate water outlet pipe 6 for storage. The low-temperature water after heat exchange enters the low-temperature water diversion pipe 9 from the low-temperature water guide pipe 8. The low-temperature water can enter the factory 11 and the dormitory 13 from the low-temperature water outlet pipe A10 and the low-temperature water outlet pipe B12 respectively. The low-temperature water after heat exchange can be used as industrial water for the factory 11 and domestic water for the dormitory 13. At the same time, it passes through the solar heater The low-temperature water after heating still has a high temperature after heat exchange, which can meet the heating needs of the factory building 11 and the dormitory 13. The low-temperature water after heat exchange is recycled, which improves the reuse efficiency of the heat of the low-temperature water. At the same time, the low-temperature water after solar ultraviolet disinfection and sterilization has a wider range of uses, which improves the reuse efficiency of the low-temperature water. The low-temperature water is preheated by using solar energy renewable resources, which improves the heat exchange efficiency of the electric heat pump 4. At the same time, the low-temperature water is heated and heat-exchanged by using the coordinated heating method of solar energy and the electric heat pump 4, which reduces the loss of electric power resources of the electric heat pump 4, so as to achieve energy saving. Effect, the interior of the electric heat pump 4 is provided with two independent elbows and they are fitted together, one of which uses water to transport low-temperature water, and the water inlet end and the water outlet end of the elbow are connected to the low-temperature water outlet pipe 3 and the low-temperature water guide pipe 8 respectively, and the other elbow uses water to transport intermediate water, and the water inlet end and the water outlet end of the elbow are connected to the intermediate water inlet pipe 5 and the intermediate water outlet pipe 6 respectively. The electric heat pump 4 uses the intermediate water as a conductive medium to convert electrical energy into thermal energy, and the heat in the low-temperature water elbow is transferred to the medium inside the intermediate water elbow by radiation, and the uniform distribution of heat is achieved through the continuous flow of water.

[0049] For example, Figure 1 As shown, one end of the storage tank 7 away from the intermediate water outlet pipe 6 is fixedly connected to the intermediate water diversion pipe 14, and one output end of the intermediate water diversion pipe 14 is fixedly connected to the intermediate water outlet pipe A15, and one end of the intermediate water outlet pipe A15 is connected to the factory building 11;

[0050] The other output end of the intermediate water diversion diversion pipe 14 is fixedly connected to an intermediate water outgoing pipe B16 , and one end of the intermediate water outgoing pipe B16 is connected to the dormitory 13 .

[0051] In some examples, when the intermediate water stored in the storage tank 7 is used, the intermediate water outgoing pipe A15 provides intermediate water to the factory 11, and the intermediate water outgoing pipe B16 provides intermediate water to the dormitory 13. The intermediate water is clean water and can be used as industrial water for the factory 11 and domestic water for the dormitory 13. The storage tank 7 has an insulation effect, and the insulated intermediate water has heat. Less electricity resources are required for reheating during use, which also saves energy.

[0052] For example, Figure 1 As shown, the outer end of the intermediate water inlet pipe 5 is fixedly connected to the solenoid valve C22, and the outer end of the low-temperature water guide pipe 8 is fixedly connected to the water pump D23;

[0053] The outer end of the low-temperature water outlet pipe A10 is fixedly connected to a solenoid valve D24, and the outer end of the low-temperature water outlet pipe B12 is fixedly connected to a solenoid valve E25.

[0054] In some examples, the solenoid valve C22 is used to control the water flow of the intermediate water inlet pipe 5, the water pump D23 is used to extract the low-temperature water after heat exchange and send it into the low-temperature water drainage shunt pipe 9, and the solenoid valve D24 and the solenoid valve E25 are used to control the flow of the low-temperature water outgoing pipe A10 and the low-temperature water outgoing pipe B12.

[0055] For example, Figure 1 As shown, the outer end of the intermediate water diversion diversion pipe 14 is fixedly connected to the water pump E26, the outer end of the intermediate water outgoing pipe A15 is fixedly connected to the solenoid valve F27, and the outer end of the intermediate water outgoing pipe B16 is fixedly connected to the solenoid valve G28.

[0056] In some examples, the water pump E26 pumps the intermediate water out of the storage tank 7 and sends it to the intermediate water outlet pipe A15 and the intermediate water outlet pipe B16 respectively. The solenoid valve F27 and the solenoid valve G28 are used to control the flow of the intermediate water outlet pipe A15 and the intermediate water outlet pipe B16 respectively.

[0057] For example, Figure 1 As shown, the outer end of the plant 11 is fixedly connected to a sewage drainage diversion pipe 29, one output end of the sewage drainage diversion pipe 29 is fixedly connected to a sewage drainage pipe A30, and the outer end of the sewage drainage pipe A30 is fixedly connected to a solenoid valve H31 and a water pump F32;

[0058] The other output end of the sewage drainage diversion pipe 29 is fixedly connected to a sewage drainage pipe B33, and the outer end of the sewage drainage pipe B33 is fixedly connected to a solenoid valve I34 and a water pump G35;

[0059] One end of the filter tank 17 away from the low-temperature water inlet pipe 2 is fixedly connected to a low-temperature water connecting pipe 38 , and the sewage discharge pipe B33 is fixedly connected to the low-temperature water connecting pipe 38 .

[0060] In some examples, the low-temperature water and intermediate water after use in the factory 11 merge into sewage. The sewage discharge diversion pipe 29 can divide the sewage into two directions for discharge. The first direction is the sewage discharge pipe A30 and the sewage drainage pipe B. During this process, the solenoid valve H31 and the water pump F32 are opened. At this time, the sewage enters the filter tank 17 from the low-temperature water connecting pipe 38. The filtered sewage can also be reused as low-temperature water and enters the solar heater 1 and the electric heat pump 4 in turn for heat exchange. The second direction is the sewage drainage pipe B33. During this process, the solenoid valve I34 and the water pump G35 are opened, and the sewage is discharged directly.

[0061] For example, Figure 1 As shown, the outer end of the dormitory 13 is fixedly connected to a waste water pipe 36 , and the outer end of the waste water pipe 36 is fixedly connected to a water pump H37 .

[0062] In some examples, the low-temperature water and intermediate water after use in the dormitory 13 contain more impurities. At this time, the water pump H37 directly discharges the sewage generated by the dormitory 13.

[0063] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0064] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0065] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A coupled system for synergistically heating low-temperature water waste heat and solar energy, comprising a solar heater (1), characterized in that: One end of the solar heater (1) is fixedly connected to a low-temperature water inlet pipe (2), one end of the solar heater (1) away from the low-temperature water inlet pipe (2) is fixedly connected to a low-temperature water outlet pipe (3), and one end of the low-temperature water outlet pipe (3) is fixedly connected to an electric heat pump (4); One side of the electric heat pump (4) is fixedly connected to an intermediate water inlet pipe (5), and the side of the electric heat pump (4) away from the intermediate water inlet pipe (5) is fixedly connected to an intermediate water outlet pipe (6), the intermediate water inlet pipe (5) is arranged on the upper side of the intermediate water outlet pipe (6), and the outer end of the intermediate water outlet pipe (6) is fixedly connected to a storage tank (7); The outer side of the electric heat pump (4) is fixedly connected to a low-temperature water guide pipe (8), the outer end of the low-temperature water guide pipe (8) is fixedly connected to a low-temperature water drainage shunt pipe (9), one output end of the low-temperature water drainage shunt pipe (9) is fixedly connected to a low-temperature water outlet pipe A (10), and the outer end of the low-temperature water outlet pipe A (10) is fixedly connected to a factory building (11); The other output end of the low-temperature water drainage shunt pipe (9) is fixedly connected to a low-temperature water outlet pipe B (12), and the outer end of the low-temperature water outlet pipe B (12) is fixedly connected to a dormitory (13).

2. The coupled system for synergistic heating using low-temperature water waste heat and solar energy according to claim 1, characterized in that: One end of the storage tank (7) away from the intermediate water outlet pipe (6) is fixedly connected to an intermediate water diversion shunt pipe (14), one output end of the intermediate water diversion shunt pipe (14) is fixedly connected to an intermediate water outlet pipe A (15), and one end of the intermediate water outlet pipe A (15) is connected to the factory building (11); The other output end of the intermediate water diversion shunt pipe (14) is fixedly connected to an intermediate water outlet pipe B (16), and one end of the intermediate water outlet pipe B (16) is connected to the dormitory (13).

3. The coupled system for synergistic heating using low-temperature water waste heat and solar energy according to claim 1, characterized in that: One end of the low-temperature water inlet pipe (2) is fixedly connected to a filter tank (17), the outer end of the low-temperature water inlet pipe (2) is fixedly connected to a water pump A (18) and a solenoid valve A (19), and the outer end of the low-temperature water outlet pipe (3) is fixedly connected to a water pump B (20) and a solenoid valve B (21).

4. The coupled system for synergistic heating using low-temperature water waste heat and solar energy according to claim 1, characterized in that: The outer end of the intermediate water inlet pipe (5) is fixedly connected to a solenoid valve C (22), and the outer end of the low-temperature water guide pipe (8) is fixedly connected to a water pump D (23).

5. The coupled system for synergistic heating using low-temperature water waste heat and solar energy according to claim 1, characterized in that: The outer end of the low-temperature water outlet pipe A (10) is fixedly connected to a solenoid valve D (24), and the outer end of the low-temperature water outlet pipe B (12) is fixedly connected to a solenoid valve E (25).

6. The coupled system for synergistic heating using low-temperature water waste heat and solar energy according to claim 2, characterized in that: The outer end of the intermediate water diversion shunt pipe (14) is fixedly connected to a water pump E (26), the outer end of the intermediate water outlet pipe A (15) is fixedly connected to a solenoid valve F (27), and the outer end of the intermediate water outlet pipe B (16) is fixedly connected to a solenoid valve G (28).

7. The coupled system for synergistic heating using low-temperature water waste heat and solar energy according to claim 3, characterized in that: The outer end of the plant (11) is fixedly connected to a sewage drainage diversion pipe (29), one output end of the sewage drainage diversion pipe (29) is fixedly connected to a sewage drainage pipe A (30), and the outer end of the sewage drainage pipe A (30) is fixedly connected to a solenoid valve H (31) and a water pump F (32); The other output end of the sewage drainage diversion pipe (29) is fixedly connected to a sewage drainage pipe B (33), and the outer end of the sewage drainage pipe B (33) is fixedly connected to a solenoid valve I (34) and a water pump G (35); One end of the filter tank (17) away from the low-temperature water inlet pipe (2) is fixedly connected to a low-temperature water connecting pipe (38), and the sewage discharge pipe B (33) is fixedly connected to the low-temperature water connecting pipe (38).

8. The coupled system for synergistic heating using low-temperature water waste heat and solar energy according to claim 1, characterized in that: The outer end of the dormitory (13) is fixedly connected to a wastewater pipe (36), and the outer end of the wastewater pipe (36) is fixedly connected to a water pump H (37).

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