Building heat supply system coupled by phase change heat storage and heat pump

Abstract

The utility model relates to a building heat supply system coupled by phase change heat storage and a heat pump, which comprises a heat pump system and phase change heat storage tanks, and has the technical key points that one main phase change heat storage tank and one standby phase change heat storage tank are adopted, and when phase change materials in the main tank need to be detached and replaced, the standby tank is used for storing and releasing heat, so that continuous energy-saving heat supply is ensured, and the heat supply cost is saved; when the phase change heat storage pipe capsule needs to be detached and replaced, the phase change heat storage pipe capsule can be rapidly detached from the upper U-shaped inserting opening and the lower U-shaped inserting opening, detachment and replacement are convenient, and the maintenance speed is greatly increased. An upper sealing film is arranged at the top of a buckle cover of the phase change heat storage capsule, a lower sealing film is arranged at the bottom of the buckle cover, contact sealing and volume compensation are achieved when phase change materials are packaged, sealing performance is guaranteed, meanwhile, the upper sealing film and the lower sealing film are thin, and heat exchange efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heating and heat supply, in particular to a building heating system coupled by phase change heat storage and a heat pump. Background Art

[0002] For users who use electric heaters or heat pumps for heating, using heat storage equipment to store heat energy during off-peak hours and releasing it during peak hours can reduce heating costs, which is currently a heating method with economic potential. Phase change thermal storage is a high-tech energy storage method that uses phase change materials as the main body of heat storage, which can be effectively combined with the building heating system. The coupled air source heat pump is operated at full power under more economical (such as off-peak hours) or more efficient (such as high outdoor temperature) conditions, and the heat beyond the heat load is stored in the phase change thermal storage device. The stored heat can be supplied to the hot end of the building during peak hours or periods of low outdoor temperature; at this time, the heat pump can stop running to achieve energy saving or reduce power consumption.

[0003] CN 209726312 U discloses a building heating system coupled by phase change heat storage and a heat pump, wherein the heat pump system comprises a variable frequency compressor, a desuperheater, a condenser, an expansion valve, and an evaporator; the evaporator is connected to the variable frequency compressor and the expansion valve through pipelines respectively; the variable frequency compressor is connected to the desuperheater through pipelines; the condenser is connected to the desuperheater and the expansion valve respectively; the phase change heat storage pipeline system comprises a phase change heat storage tank, a desuperheater heat storage pipeline three-way valve, a desuperheater heat storage pipeline circulating water pump, and a desuperheater; the desuperheater heat storage pipeline three-way valve is connected to the phase change heat storage tank and the desuperheater heat storage pipeline circulating water pump through pipelines respectively; the phase change heat pump coupled heating pipeline system comprises a desuperheater heat storage pipeline circulating water pump, a first pipeline circulating water pump, a second pipeline circulating water pump, a condenser, and an auxiliary electric heater. The building heating system is intended to avoid the low heat pump efficiency coefficient when the phase change heat storage device is combined with the heat pump condenser to store heat, avoid a significant reduction in the overall efficiency of the heating system, and reduce power consumption. However, there are the following problems when using it: 1. The heat storage performance of the phase change heat storage tube capsule in the phase change heat storage tank will decrease after long-term use, and the maintenance process will affect energy-saving heating production; 2. The heat exchange efficiency of the phase change heat storage tube capsule in the phase change heat storage tank is low and it is not convenient to disassemble and replace. Utility Model Content

[0004] The purpose of the utility model is to provide a building heating system coupled with phase change heat storage and a heat pump, which has a reasonable structure and reliable use to solve the above problems, ensure continuous energy-saving heating, and further save heating costs.

[0005] The technical solution of the utility model is:

[0006] A building heating system coupled with phase change heat storage and heat pump, including a heat pump system and a phase change heat storage tank coupled with the heat pump system, the technical key points of which are: the number of the phase change heat storage tanks is two, one main and one standby, connected in parallel between the inlet and outlet of the heat pump system's desuperheater, the phase change heat storage tank includes a heat insulation shell, a lower positioning plate arranged in the heat insulation shell, an upper movable plate, and a phase change heat storage capsule tube bundle, the lower positioning plate is provided with a plurality of mutually parallel lower U-shaped sockets at intervals, the upper movable plate is provided with an upper U-shaped socket corresponding to the lower U-shaped sockets one by one, the phase change heat storage glue The capsule-tube bundle includes multiple groups of phase-change heat storage capsules, the number of groups of phase-change heat storage capsules is equal to and corresponds to the number of lower U-shaped sockets, each group of phase-change heat storage capsules includes multiple phase-change heat storage capsules, and the lower parts of the phase-change heat storage capsules are clamped in the lower U-shaped sockets at intervals, a buckle cover is provided on the upper part of the phase-change heat storage capsule, an upper sealing film is provided on the top of the buckle cover, a clamping groove matching the upper U-shaped socket is provided on the outer periphery of the buckle cover, a lower sealing film is provided on the bottom surface of the phase-change heat storage capsule, protrusions are provided on both sides of the upper movable plate, and longitudinal sliding grooves corresponding to the protrusions are provided on the inner wall of the heat-insulating outer shell.

[0007] The above-mentioned building heating system coupled with phase change heat storage and heat pump, the heat pump system includes a variable frequency compressor, a desuperheater, a condenser, an expansion valve and an evaporator connected in sequence, and the evaporator outlet is connected to the variable frequency compressor inlet.

[0008] In the above-mentioned building heating system coupled with phase change heat storage and heat pump, the inner wall of the buckle cover is provided with a sealing ring which is tightly fitted with the outer wall of the phase change heat storage capsule.

[0009] In the above-mentioned building heating system coupled by phase change heat storage and heat pump, the tops of the two phase change heat storage tanks are respectively provided with a first pipeline and a first control valve are provided on the first pipeline, the ends of the two first pipelines are communicated with the shell side outlet pipeline of the desuperheater, the shell side outlet pipeline is provided with a first pump body, the bottoms of the two phase change heat storage tanks are respectively provided with a second pipeline and a second control valve are provided on the second pipeline, the ends of the two second pipelines are communicated with the shell side inlet pipeline of the desuperheater, the first pipeline is provided with a first temperature sensor, the second pipeline is provided with a second temperature sensor, the outlet of the first pump body is provided with a third control valve, the shell side inlet pipeline of the desuperheater is provided with a fourth control valve at a position between the two second control valves, and a fifth control valve is provided on the side close to the desuperheater.

[0010] In the above-mentioned building heating system coupled with phase change heat storage and heat pump, the end of the shell side inlet pipeline of the desuperheater is connected to the first water supply pipeline, and the starting end of the first water supply pipeline is provided with a sixth control valve.

[0011] The above-mentioned building heating system coupled with phase change heat storage and heat pump, the shell side inlet of the condenser of the heat pump system is connected to the second water supply pipeline, the shell side outlet pipeline of the condenser is provided with a second pump body and the end of the shell side outlet pipeline is connected to the confluence main pipe, the starting end of the confluence main pipe is provided with two branch pipelines, the two branch pipelines correspond to and are connected with the two first pipelines one by one, the two branch pipelines are respectively provided with a seventh control valve, the confluence main pipe is provided with a third pump body and an eighth control valve, the shell side outlet pipeline of the condenser is provided with a ninth control valve near the confluence main pipe, and the shell side outlet of the condenser is provided with a third temperature sensor.

[0012] In the above-mentioned building heating system coupled with phase change heat storage and heat pump, an electric heat exchanger is provided at the end of the confluence main pipe.

[0013] In the above-mentioned building heating system coupled with phase change heat storage and heat pump, the shell inlet of the desuperheater is provided with a water supply branch, the outlet of the first pump body is provided with a heating branch, the water supply branch is provided with a tenth control valve, and the heating branch is provided with an eleventh control valve.

[0014] The beneficial effects of the utility model are:

[0015] 1. Use one main and one backup phase change thermal storage tank. When the phase change material in the main tank needs to be replaced, the backup tank is used to store and release heat, thereby ensuring continuous energy-saving heating and saving heating costs.

[0016] 2. When the phase-change heat storage tube capsule needs to be replaced, the phase-change heat storage tube capsule can be quickly removed from the upper and lower U-shaped sockets, which is convenient for replacement and greatly improves the maintenance speed.

[0017] 3. An upper sealing film is provided on the top of the buckle cover of the phase change heat storage capsule, and a lower sealing film is provided on the bottom. When the phase change material is encapsulated, contact sealing and volume compensation are achieved to ensure sealing. At the same time, the upper and lower sealing films are relatively thin, which improves the heat exchange efficiency.

[0018] 4. The height of the upper movable plate can be adjusted according to the cover position of the phase change thermal storage capsule to ensure installation applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model;

[0020] Figure 2 yes Figure 1 Schematic diagram of the structure of the phase change thermal storage tank;

[0021] Figure 3 This is the arrangement diagram of the upper movable plate and the phase change thermal storage capsule.

[0022] In the figure: 1. confluence main pipe, 2. electric heat exchanger, 3. eighth control valve, 4. third pump body, 5. ninth control valve, 6. shell side outlet pipeline, 7. second pump body, 8. third temperature sensor, 9. condenser, 10. second water supply pipeline, 11. expansion valve, 12. evaporator, 13. variable frequency compressor, 14. desuperheater, 15. tenth control valve, 16. water supply branch, 17. first pump body, 18. eleventh control valve, 19. heating branch, 20. fifth control valve, 21. second control valve, 22. 2. Temperature sensor, 23. 4th control valve, 24. 6th control valve, 25. 1st water supply pipeline, 26. 3rd control valve, 27. Branch pipeline, 28. 7th control valve, 29. 1st pipeline, 30. 1st control valve, 31. 1st temperature sensor, 32. Phase change thermal storage tank, 33. 2nd pipeline, 34. Upper sealing film, 35. Longitudinal slide groove, 36. Upper movable plate, 37. Buckle cover, 38. Phase change thermal storage capsule, 39. Lower positioning plate, 40. Lower sealing film, 41. Upper U-shaped socket, 42. Bump. DETAILED DESCRIPTION

[0023] The utility model is described in detail according to the accompanying drawings of the specification.

[0024] like Figure 1 to Figure 3 As shown, the building heating system coupled by phase change heat storage and heat pump includes a heat pump system and a phase change heat storage tank 32 coupled to the heat pump system.

[0025] There are two phase change heat storage tanks 32, one for main use and one for backup use, which are connected in parallel between the inlet and the outlet of the desuperheater 14 of the heat pump system.

[0026] The phase-change heat storage tank 32 includes a heat-insulating shell, a lower positioning plate 39 arranged in the heat-insulating shell, an upper movable plate 36, and a phase-change heat storage capsule tube bundle. The lower positioning plate 39 is provided with a plurality of mutually parallel lower U-shaped sockets at intervals, and the upper movable plate 36 is provided with an upper U-shaped socket 41 corresponding to the lower U-shaped sockets one by one. The upper movable plate 36 is provided with protrusions 42 on both sides, and the inner wall of the heat-insulating shell is provided with a longitudinal slide groove 35 corresponding to the protrusions 42. The phase-change heat storage capsule tube bundle includes a plurality of groups of phase-change heat storage capsules 38, and the number of groups of phase-change heat storage capsules 38 is equal to and corresponds to the number of lower U-shaped sockets. Each group of phase-change heat storage capsules 38 includes a plurality of phase-change heat storage capsules 38, and the lower portions of the phase-change heat storage capsules 38 are spaced and snap-fitted into the lower U-shaped sockets. A buckle cover 37 is provided on the upper part of the phase change thermal storage capsule 38, an upper sealing film 34 is provided on the top of the buckle cover 37, a snap-on groove matching with the upper U-shaped socket 41 is provided on the outer periphery of the buckle cover 37, a lower sealing film 40 is provided on the bottom surface of the phase change thermal storage capsule 38, and a sealing ring is provided on the inner wall of the buckle cover 37 which fits tightly with the outer wall of the phase change thermal storage capsule 38.

[0027] In this embodiment, the heat pump system includes a variable frequency compressor 13 , a desuperheater 14 , a condenser 9 , an expansion valve 11 and an evaporator 12 which are connected in sequence, and the outlet of the evaporator 12 is connected to the inlet of the variable frequency compressor 13 .

[0028] The tops of the two phase-change heat storage tanks 32 are provided with first pipelines 29, respectively, and the first pipelines 29 are provided with first control valves 30. The ends of the two first pipelines 29 are connected to the shell-side outlet pipeline of the desuperheater 14, and the shell-side outlet pipeline is provided with a first pump body 17. The bottoms of the two phase-change heat storage tanks 32 are provided with second pipelines 33, respectively, and the second pipelines 33 are provided with second control valves 21. The ends of the two second pipelines 33 are connected to the shell-side inlet pipeline of the desuperheater 14. The first pipeline 29 is provided with a first temperature sensor 31, and the second pipeline 33 is provided with a second temperature sensor 22. The outlet of the first pump body 17 is provided with a third control valve 26. The shell-side inlet pipeline of the desuperheater 14 is provided with a fourth control valve 23 at a position between the two second control valves 21, and a fifth control valve 20 is provided near the desuperheater. The end of the shell-side inlet pipeline of the desuperheater 14 is connected to the first water supply pipeline 25, and the starting end of the first water supply pipeline 25 is provided with a sixth control valve 24. The shell side inlet of the condenser 9 of the heat pump system is connected with the second water supply pipeline 10, the shell side outlet pipeline 6 of the condenser 9 is provided with a second pump body 7 and the end of the shell side outlet pipeline is connected with the confluence main pipe 1, the starting end of the confluence main pipe 1 is provided with two branch pipelines 27, the two branch pipelines 27 correspond to and are connected with the two first pipelines 29, and the two branch pipelines 27 are respectively provided with a seventh control valve 28, the confluence main pipe 1 is provided with a third pump body 4 and an eighth control valve 3, the shell side outlet pipeline of the condenser 9 is provided with a ninth control valve 5 near the confluence main pipe 1, and the shell side outlet of the condenser 9 is provided with a third temperature sensor 8. The shell side inlet of the desuperheater 14 is provided with a water supply branch 16, the outlet of the first pump body 17 is provided with a heat supply branch 19, the water supply branch 16 is provided with a tenth control valve 15, and the heat supply branch 19 is provided with an eleventh control valve 18. The end of the confluence main pipe 1 is provided with an electric heat exchanger 2.

[0029] Working principle:

[0030] 1. The first water supply pipeline 25 can be used to supply hot water to the shell side of the desuperheater 14. After the hot water is heated by the desuperheater 14, it is stored in one of the phase change heat storage tanks 32. When the feedback signal of the second temperature sensor 22 is within the set range, the second phase change heat storage tank 32 can be used to store heat.

[0031] 2. When releasing heat, on the one hand, the confluence main pipe 1 receives the exchange water from the condenser 9, and on the other hand, water enters the first water supply pipe 25 and enters the phase change heat storage tank 32 through the second pipe 33. After absorbing heat, the water enters the confluence main pipe 1 through the first pipe 29 and the branch pipe 27, thereby realizing the coupled heating of phase change heat storage and heat pump.

[0032] The above is a detailed description of the embodiments of the utility model, but the above contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of the invention of the utility model should still fall within the scope of this patent.

Claims

1. A building heating system coupled with phase change heat storage and heat pump, comprising a heat pump system and a phase change heat storage tank coupled with the heat pump system, characterized in that: The number of the phase-change heat storage tanks is two, one main and one backup, connected in parallel between the inlet and outlet of the desuperheater of the heat pump system. The phase-change heat storage tank includes a heat-insulating shell, a lower positioning plate arranged in the heat-insulating shell, an upper movable plate, and a phase-change heat storage capsule bundle. The lower positioning plate is provided with a plurality of mutually parallel lower U-shaped sockets at intervals, and the upper movable plate is provided with upper U-shaped sockets corresponding to the lower U-shaped sockets one by one. The phase-change heat storage capsule bundle includes a plurality of groups of phase-change heat storage capsules, and the number of groups of phase-change heat storage capsules is equal to The number of lower U-shaped sockets is equal and one-to-one corresponding, each group of phase change heat storage capsules includes multiple phase change heat storage capsules and the lower parts of the phase change heat storage capsules are snap-fitted into the lower U-shaped sockets at intervals, a buckle cover is provided on the upper part of the phase change heat storage capsule, an upper sealing film is provided on the top of the buckle cover, a snap-fitting groove matching the upper U-shaped socket is provided on the outer periphery of the buckle cover, a lower sealing film is provided on the bottom surface of the phase change heat storage capsule, bumps are provided on both sides of the upper movable plate, and longitudinal slide grooves corresponding to the bumps are provided on the inner wall of the heat insulation shell.

2. The building heating system coupled with phase change thermal storage and heat pump according to claim 1, characterized in that: The heat pump system comprises a variable frequency compressor, a desuperheater, a condenser, an expansion valve and an evaporator which are connected in sequence, and the outlet of the evaporator is connected to the inlet of the variable frequency compressor.

3. The building heating system coupled with phase change thermal storage and heat pump according to claim 1, characterized in that: The inner wall of the buckle cover is provided with a sealing ring which is tightly fitted with the outer wall of the phase-change heat storage capsule.

4. The building heating system coupled with phase change thermal storage and heat pump according to claim 1, characterized in that: A first pipeline is respectively provided on the top of the two phase-change heat storage tanks and a first control valve is provided on the first pipeline. The ends of the two first pipelines are communicated with the shell-side outlet pipeline of the desuperheater, and a first pump body is provided on the shell-side outlet pipeline. Second pipelines are respectively provided on the bottom of the two phase-change heat storage tanks and a second control valve is provided on the second pipeline. The ends of the two second pipelines are communicated with the shell-side inlet pipeline of the desuperheater, a first temperature sensor is provided on the first pipeline, a second temperature sensor is provided on the second pipeline, a third control valve is provided at the outlet of the first pump body, a fourth control valve is provided on the shell-side inlet pipeline of the desuperheater between the two second control valves, and a fifth control valve is provided on the side close to the desuperheater.

5. The building heating system coupled with phase change thermal storage and heat pump according to claim 4, characterized in that: The end of the shell side inlet pipeline of the desuperheater is communicated with the first water supply pipeline, and a sixth control valve is provided at the starting end of the first water supply pipeline.

6. The building heating system coupled with phase change thermal storage and heat pump according to claim 2, characterized in that: The shell side inlet of the condenser of the heat pump system is connected with the second water supply pipeline, the shell side outlet pipeline of the condenser is provided with a second pump body and the end of the shell side outlet pipeline is connected with the confluence main pipe, the starting end of the confluence main pipe is provided with two branch pipelines, the two branch pipelines correspond to and are connected with the two first pipelines one by one, and the two branch pipelines are respectively provided with a seventh control valve, the confluence main pipe is provided with a third pump body and an eighth control valve, the shell side outlet pipeline of the condenser is provided with a ninth control valve near the confluence main pipe, and the shell side outlet of the condenser is provided with a third temperature sensor.

7. The building heating system coupled with phase change thermal storage and heat pump according to claim 6, characterized in that: An electric heat exchanger is arranged at the end of the confluence main pipe.

8. The building heating system coupled with phase change thermal storage and heat pump according to claim 4, characterized in that: A water supply branch is provided at the shell side inlet of the desuperheater, a heating branch is provided at the outlet of the first pump body, a tenth control valve is provided on the water supply branch, and an eleventh control valve is provided on the heating branch.

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