Buried pipe cold and heat dual-storage comprehensive energy supply system and method

Abstract

The invention provides a buried pipe cold and heat dual-storage comprehensive energy supply system and method, the system comprises a solar heat collection system, a water chilling unit system, a ground source heat pump system, a user terminal and a valve, the solar heat collection system and the water chilling unit system are respectively connected in series and coupled with a shallow buried pipe in the ground source heat pump system through pipelines, and the valves are arranged on the pipelines; according to the buried pipe cold and hot double-storage comprehensive energy supply system and method, through switching of the valves, switching of the four modes of heat storage, cold storage, heating and cold supply is achieved in different seasons, and the operation modes of the seasons include spring cold storage, winter cold supply, autumn heat storage and winter heat supply.

Description

Technical Field

[0001] The present invention relates to the technical field of geothermal cooling and heating, and in particular to a buried pipe combined heat and cold storage integrated energy supply system and method. Background Art

[0002] Shallow geothermal energy is the energy stored in the underground soil within a depth of 0 - 200m below the ground surface. Shallow geothermal energy is buried relatively shallowly. Generally, heat exchange through buried pipes is used to extract underground heat (cooling capacity), and after the heat (cooling) grade is improved by a ground source heat pump, it is supplied to the terminal. With a set of equipment, heating in winter and cooling in summer can be achieved, truly realizing zero emissions and zero pollution in the building use area for heating (cooling).

[0003] The earth is a vast energy reservoir with inexhaustible energy, but it also faces two problems. The distribution of various resources is extremely uneven, resulting in a contradiction between supply and demand in space. The consumption of energy is affected by climate, seasons, etc., resulting in a contradiction between supply and demand in time. Therefore, the proposed system provides a new way to solve the above problems by using underground rock and soil as a "container" for storing heat (cooling capacity), improving energy utilization efficiency from both time and space dimensions.

[0004] The present invention combines a shallow ground source heat pump system with a solar collector system and a chiller. During the intermittent period, heat and cooling capacity can be stored in the underground soil through the solar collector system and the chiller respectively, and extracted through the buried pipes during energy consumption, making full use of solar energy and valley electricity, and improving the energy supply efficiency and energy utilization rate. Summary of the Invention

[0005] The purpose of the present invention is to provide a buried pipe combined heat and cold storage integrated energy supply system and method, which can switch between four modes of heat storage, cold storage, heating, and cooling in different seasons through the switching of valves. The operating modes in each season are cold storage in spring, cooling in winter, heat storage in autumn, and heating in winter.

[0006] To achieve the above purpose, the present invention provides a buried pipe combined heat and cold storage integrated energy supply system and method, including a solar collector system, a chiller system, a ground source heat pump system, a user terminal, and valves. The solar collector system and the chiller system are respectively connected in series and coupled to the shallow buried pipes in the ground source heat pump system through pipelines, and valves are provided on the pipelines.

[0007] Preferably, the solar collector system includes a solar collector, a hot water storage tank, and pipelines. The solar collector is connected to the hot water storage tank through pipelines.

[0008] Preferably, the chiller system includes a cooling tower, a chiller, and pipelines. The cooling tower is connected to the chiller through pipelines.

[0009] Preferably, the ground source heat pump system includes a ground source heat pump, shallow buried pipes, and pipelines. The ground source heat pump is connected to the shallow buried pipes through pipelines.

[0010] Preferably, the valves include a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve, a ninth valve, a tenth valve, an eleventh valve, and a twelfth valve; the first valve and the second valve are provided on the pipeline in the cooling unit system, and the fifth valve, the sixth valve, the seventh valve, and the eighth valve are provided on the pipeline between the solar collector system and the ground source heat pump system. The seventh valve, the eighth valve, the eleventh valve, and the twelfth valve are provided on the pipeline between the chiller system and the ground source heat pump system; the third valve and the fourth valve are provided on the pipeline between the chiller system and the user terminal, and the ninth valve and the tenth valve are provided on the pipeline between the ground source heat pump system and the user terminal.

[0011] Preferably, it includes the following steps:

[0012] Step S1: Check and ensure that all valves are in the closed state; confirm that the solar collector, the hot water storage tank, the chiller, the ground source heat pump, and the cooling tower are all in the normal standby state;

[0013] Step S2: In spring, open the first valve, the second valve, the seventh valve, the eighth valve, the eleventh valve, and the twelfth valve to connect the chiller and the cooling tower circuits; start the chiller and the cooling tower, and the chiller and the cooling tower work together during the low-cost valley electricity period at night to generate cooling water; the chiller is connected to the shallow buried pipes; the cooling water generated by the chiller enters the shallow buried pipes and is stored in the surrounding underground soil; the cooling water generated by the chiller is stored in the surrounding underground soil through the shallow buried pipes;

[0014] Step S3: In summer, open the first valve, the second valve, the third valve, the fourth valve, the seventh valve, the eighth valve, the ninth valve, and the tenth valve. Through the water circulation between the ground source heat pump and the shallow buried pipes, the cooling water stored in the surrounding underground soil in Step S1 is upgraded in quality, and the upgraded cooling water is supplied to the user terminal for cooling through the ground source heat pump;

[0015] When the cooling demand of the user terminal exceeds the capacity provided by the ground source heat pump, the chiller and the cooling tower work together to generate cooling water, and the chiller is started to supplement cooling water for the user terminal for cooling;

[0016] Step S4: In autumn, open the fifth valve, the sixth valve, the seventh valve, and the eighth valve. First, supplement tap water to the solar collector. The solar collector heats the tap water to generate high-temperature hot water, and the high-temperature hot water is stored in the hot water storage tank;

[0017] The hot water storage tank is connected to the shallow buried pipe, and the high-temperature hot water in the hot water storage tank is stored in the surrounding underground soil through the shallow buried pipe.

[0018] Step S5: In winter, open the seventh valve, the eighth valve, the ninth valve, and the tenth valve. The high-temperature hot water stored in the underground soil around the shallow buried pipe through Step S3 is supplied to the user terminal after the heat grade of the high-temperature hot water is increased by the ground source heat pump.

[0019] Therefore, the present invention adopts the above-mentioned ground buried pipe cold and heat double storage integrated energy supply system and method. Through the switching of valves, the switching of four modes of heat storage, cold storage, heating, and cooling is realized in different seasons. The operation modes in each season are cold storage in spring, cooling in winter, heat storage in autumn, and heating in winter. Brief Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall system of a ground buried pipe cold and heat double storage integrated energy supply system and method of the present invention;

[0021] Figure 2 It is a general flow chart of a ground buried pipe cold and heat double storage integrated energy supply system and method of the present invention.

[0022] Reference Signs

[0023] 1. Solar collector; 2. Hot water storage tank; 3. Cooling tower; 4. Chiller; 5. Ground source heat pump; 6. Shallow buried pipe; 7. First valve; 8. Second valve; 9. Third valve; 10. Fourth valve; 11. Fifth valve; 12. Sixth valve; 13. Seventh valve; 14. Eighth valve; 15. Ninth valve; 16. Tenth valve; 17. Eleventh valve; 18. Twelfth valve; 19. Pipeline. Detailed Embodiments

[0024] The technical solutions of the present invention will be further described below with reference to the drawings and embodiments.

[0025] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the field to which the present invention belongs.

[0026] Embodiment 1

[0027] As Figure 1 - Figure 2 shown, the present invention provides a ground buried pipe cold and heat double storage integrated energy supply system and method, including a solar heat collection system, a chiller system, a ground source heat pump system, a user terminal, and valves. The solar heat collection system and the chiller system are respectively connected in series and coupled with the shallow buried pipe 6 in the ground source heat pump system through the pipeline 19, and valves are provided on the pipeline 19.

[0028] The solar heat collection system includes a solar heat collector 1, a hot water storage tank 2, and a pipeline 19. The solar heat collector 1 is connected to the hot water storage tank 2 through the pipeline 19.

[0029] The chiller system includes a cooling tower 3, a chiller 4, and a pipeline 19. The cooling tower 3 is connected to the chiller 4 through the pipeline 19.

[0030] The ground source heat pump system includes a ground source heat pump 5, a shallow buried ground pipe 6, and a pipeline 19. The ground source heat pump 5 is connected to the shallow buried ground pipe 6 through the pipeline 19.

[0031] The valves include a first valve 7, a second valve 8, a third valve 9, a fourth valve 10, a fifth valve 11, a sixth valve 12, a seventh valve 13, an eighth valve 14, a ninth valve 15, a tenth valve 16, an eleventh valve 17, and a twelfth valve 18. The first valve 7 and the second valve 8 are provided on the pipeline 19 in the chiller system. The fifth valve 11, the sixth valve 12, the seventh valve 13, and the eighth valve 14 are provided on the pipeline 19 between the solar heat collection system and the ground source heat pump system. The seventh valve 13, the eighth valve 14, the eleventh valve 17, and the twelfth valve 18 are provided on the pipeline 19 between the chiller system and the ground source heat pump system. The third valve 9 and the fourth valve 10 are provided on the pipeline 19 between the chiller system and the user terminal. The ninth valve 15 and the tenth valve 16 are provided on the pipeline 19 between the ground source heat pump system and the user terminal.

[0032] It includes the following steps:

[0033] Step S1: Check and ensure that all valves are in the closed state; confirm that the equipment such as the solar heat collector 1, the hot water storage tank 2, the chiller 4, the ground source heat pump 5, and the cooling tower 3 are all in the normal standby state; ensure the safety of the initial state of the system and that all equipment is ready.

[0034] Step S2: In spring, open the first valve 7, the second valve 8, the seventh valve 13, the eighth valve 14, the eleventh valve 17, and the twelfth valve 18 to connect the chiller 4 and the cooling tower 3 circuits; start the chiller 4 and the cooling tower 3, and the chiller 4 and the cooling tower 3 work together during the low-cost valley electricity period at night to generate cooling water; generate cooling water using the low-cost electricity at night.

[0035] Open the seventh valve 13, the eighth valve 14, the eleventh valve 17, and the twelfth valve 18 to connect the chiller 4 and the shallow buried ground pipe 6; the cooling water of the chiller 4 enters the shallow buried ground pipe 6 and is stored in the surrounding underground soil through heat exchange; store the cooling water generated by the chiller 4 in the surrounding underground soil through the shallow buried ground pipe 6 to store cold energy.

[0036] Close the first valve 7, the second valve 8, the eleventh valve 17, and the twelfth valve 18 in sequence, stop the operation of the chiller 4 and the cooling tower 3, keep the seventh valve 13 and the eighth valve 14 open for five minutes to drain the residual cold water in the shallow buried ground pipe 6; stop the chiller 4 and the cooling tower 3, and drain the residual cold water in the shallow buried ground pipe 6 to prepare for the next operation.

[0037] Step S3: In summer, open the first valve 7, the second valve 8, the third valve 9, the fourth valve 10, the seventh valve 13, the eighth valve 14, the ninth valve 15, and the tenth valve 16. Through the water circulation between the ground source heat pump 5 and the shallow buried ground pipe 6, improve the quality of the cooling water stored in the surrounding underground soil in step S1. Open the ninth valve 15 and the tenth valve 16, and supply the generated cold water to the user terminal through the ground source heat pump 5; extract the cold energy stored in the underground soil by using the ground source heat pump 5, and supply the cooling water with improved quality to the user terminal through the ground source heat pump 5.

[0038] When the cooling demand of the user terminal exceeds the capacity provided by the ground source heat pump 5, the chiller 4 and the cooling tower 3 work together to generate cooling water, start the chiller 4 to supplement the cooling water to the user terminal for cooling; open the first valve 7 and the second valve 8, the chiller 4 and the cooling tower 3 work together to generate cold water, open the third valve 9 and the fourth valve 10, and start the chiller 4 to supplement the cooling to the user terminal; when the ground source heat pump 5 cannot meet the user's demand, start the chiller 4 and the cooling tower 3 to supplement the cooling.

[0039] Step S3: In autumn, open the fifth valve 11, the sixth valve 12, the seventh valve 13, and the eighth valve 14. First, supplement tap water to the solar collector 1. The tap water is heated in the solar collector 1 to generate high-temperature hot water, and the high-temperature hot water is stored in the hot water storage tank 2.

[0040] The hot water storage tank 2 is connected to the shallow buried ground pipe 6, and the high-temperature hot water in the hot water storage tank 2 is stored in the surrounding underground soil through the shallow buried ground pipe 6 to store heat.

[0041] By connecting the hot water storage tank 2 with the shallow buried ground pipe 6, the high-temperature hot water generated by the solar heating system is transported to the underground soil for storage, realizing the underground seasonal storage of thermal energy and providing heat source for subsequent heating requirements.

[0042] First, after the hot water storage tank 2 cools down, close the fifth valve 11 and the sixth valve 12, and then close the seventh valve 13 and the eighth valve 14; close the fifth valve 11 and the sixth valve 12 to stop the water replenishment and circulation of the solar heating system to ensure that the system stops operating; then close the seventh valve 13 and the eighth valve 14 to cut off the connection between the hot water storage tank 2 and the shallow buried ground pipe 6 to avoid reverse heat loss or system misoperation.

[0043] Step S5: In winter, open the seventh valve 13, the eighth valve 14, the ninth valve 15 and the tenth valve 16. The high-temperature hot water stored in the underground soil around the shallow buried pipe 6 through step S3 is supplied to the user terminal after the heat grade of the high-temperature hot water is increased by the ground source heat pump 5 to meet the heat load demand of the user terminal.

[0044] Therefore, the present invention adopts the above-mentioned ground buried pipe cold and heat double storage integrated energy supply system and method. Through the switching of valves, the switching of four modes of heat storage, cold storage, heating and cooling is realized in different seasons. The operating modes in each season are cold storage in spring, cooling in winter, heat storage in autumn and heating in winter.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A buried pipe cold and hot dual storage integrated energy supply system, characterized in that: It includes a solar thermal collection system, a chiller system, a ground source heat pump system, a user terminal and a valve. The solar thermal collection system and the chiller system are respectively coupled in series with the shallow buried pipes in the ground source heat pump system through pipelines, and valves are arranged on the pipelines.

2. A buried pipe cold and hot dual storage integrated energy supply system according to claim 1, characterized in that: The solar thermal collection system includes a solar thermal collector, a heat collection tank and pipelines, and the solar thermal collector is connected to the heat collection tank through the pipeline.

3. According to claim 1, a buried pipe cold and hot dual storage integrated energy supply system is characterized in that: The chiller system includes a cooling tower, a chiller and pipelines, and the cooling tower is connected to the chiller through pipelines.

4. According to claim 1, a buried pipe cold and hot dual storage integrated energy supply system is characterized in that: The geothermal heat pump system includes a geothermal heat pump, shallow buried pipes and pipelines. The geothermal heat pump is connected to the shallow buried pipes through pipelines.

5. According to claim 1, a buried pipe cold and hot dual storage integrated energy supply system is characterized in that: The valves include a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve, a ninth valve, a tenth valve, an eleventh valve and a twelfth valve; the first valve and the second valve are arranged on the pipeline in the cooling unit system, the fifth valve, the sixth valve, the seventh valve and the eighth valve are arranged on the pipeline between the solar thermal collection system and the ground source heat pump system, the seventh valve, the eighth valve, the eleventh valve and the twelfth valve are arranged on the pipeline between the chiller system and the ground source heat pump system; the third valve and the fourth valve are arranged on the pipeline between the chiller system and the user terminal, and the ninth valve and the tenth valve are arranged on the pipeline between the ground source heat pump system and the user terminal.

6. A method of a buried pipe cold and hot dual storage integrated energy supply system according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step S1, check and ensure that all valves are in the closed state; confirm that the solar collector, water collection tank, chiller, ground source heat pump and cooling tower are in normal standby state; Step S2: in spring, open the first valve, the second valve, the seventh valve, the eighth valve, the eleventh valve and the twelfth valve to connect the chiller and the cooling tower circuit; start the chiller and the cooling tower, and the chiller and the cooling tower work together to generate cooling water during the night-time cheap valley electricity period; The chiller is connected to the shallow buried pipe; the cooling water of the chiller enters the shallow buried pipe and is stored in the surrounding underground soil; The cooling water generated by the chiller is stored in the surrounding underground soil through shallow buried pipes; Step S3, in summer, the first valve, the second valve, the third valve, the fourth valve, the seventh valve, the eighth valve, the ninth valve and the tenth valve are opened, and the cooling water stored in the surrounding underground soil in step S1 is improved in quality through water circulation between the ground source heat pump and the shallow buried pipe, and the improved cooling water is supplied to the user end through the ground source heat pump; When the cooling demand at the user end exceeds the capacity provided by the ground source heat pump, the chiller and cooling tower work together to generate cooling water, and the chiller is started to supplement cooling water to the user end; Step S4: in autumn, the fifth valve, the sixth valve, the seventh valve and the eighth valve are opened. First, tap water is added to the solar collector. The solar collector heats the tap water to generate high-temperature hot water, which is then stored in the heat collection tank. The heat collecting tank is connected to the shallow buried pipe, and the high-temperature hot water in the heat collecting tank is stored in the surrounding underground soil through the shallow buried pipe; Step S5: In winter, the seventh valve, the eighth valve, the ninth valve and the tenth valve are opened, and the high-temperature hot water stored in the underground soil around the shallow buried pipe in step S3 is supplied to the user end after the heat quality of the high-temperature hot water is improved by the ground source heat pump.

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