Ground source heat pump heating system utilizing solar energy recharge heat compensation in non-heating seasons

Abstract

The utility model relates to the field of renewable energy source application, and discloses a ground source heat pump heating system utilizing solar energy recharge heat compensation in a non-heating season, which comprises a solar heat collector, a middle-deep layer buried pipe heat exchange unit, a heat storage unit, a water delivery pipe and a temperature sensor, the solar heat collector is connected with the heat storage unit through a water conveying pipe. The heat storage unit is connected with the middle-deep layer buried pipe heat exchange unit and the tail end heat supply loop through water conveying pipes. The middle-deep layer buried pipe heat exchange unit is connected with the tail end heat supply loop through a water conveying pipe. And the temperature sensor is used for monitoring the operation condition of the system and guiding the time of recharge. According to the utility model, a middle-deep layer buried pipe is combined with a solar system, and solar energy is utilized to carry out heat recharge and heat compensation on surrounding soil in a non-heating season, so that the recovery of the ground temperature of a deep part of 2000-3000 meters is promoted, the operation stability of the system is ensured, and the efficient and continuous utilization of middle-deep layer geothermal energy is ensured; and meanwhile, the utilization rate of surplus solar energy in non-heating seasons is increased.

Description

Technical Field

[0001] This utility model relates to the field of renewable energy applications, and in particular to a ground source heat pump heating system that utilizes solar energy for heat replenishment during the non-heating season. Background Technology

[0002] Ground source heat pumps utilize circulating water to exchange heat with groundwater, soil, or surface water. They leverage the moderate underground temperatures to improve efficiency and reduce the operating costs of heating and cooling systems. In winter, ground source heat pumps "extract" energy from the soil and rock to supply indoor heating; in summer, they extract heat from the indoor environment and "release" it into groundwater, soil, or surface water.

[0003] Under long-term operation, the soil temperature around the buried pipe heat exchanger will decrease to some extent because the geothermal heat flow cannot replenish the taken-out heat in a timely manner. In particular, for medium-deep buried pipe heat exchangers buried at a depth of 2000-3000 meters, long-term operation will lead to a continuous decrease in the temperature of the deep soil, which will not only affect the thermal properties of the soil, but also affect the energy supply stability of the system.

[0004] Solar energy is one of the most widely used renewable energy sources. In solar energy utilization technologies, solar collectors are key equipment, converting solar energy into heat energy. This conversion process is particularly common in solar water heating systems and forms the basis of solar interseasonal thermal storage technology. During the non-heating season, such as summer, solar collectors can generate large quantities of high-temperature hot water. This hot water can be used directly by users or stored in thermal storage devices for use in winter. Utility Model Content

[0005] To address existing problems, this utility model provides a ground source heat pump heating system that utilizes solar energy for heat reinjection during the non-heating season. The system combines a ground source heat pump system using medium-deep buried pipes with a solar energy system. During the non-heating season, solar energy is used to reinject heat into the surrounding soil through the buried pipe heat exchanger, thereby promoting the recovery of ground temperature at a depth of 2000-3000 meters and ensuring the stability of the system's operation.

[0006] To achieve the above objectives, the present invention provides the following technical solution.

[0007] A ground-source heat pump heating system utilizing solar energy for reinjection during the non-heating season includes a solar collector, a medium-deep buried pipe heat exchange unit, a heat storage unit, a water supply pipe, and a temperature sensor. The solar collector is connected to the heat storage unit via the water supply pipe. The heat storage unit is connected to the medium-deep buried pipe heat exchange unit and the terminal heating loop via the water supply pipe. The medium-deep buried pipe heat exchange unit is connected to the terminal heating loop via the water supply pipe. The temperature sensor is used to monitor the system's operating status and guide the timing of reinjection.

[0008] As a further improvement of this utility model, it also includes a first temperature sensor; the first temperature sensor is installed in the water supply pipe of the deep underground pipe heat exchange unit and is used to monitor the temperature of the medium in the water supply pipe.

[0009] As a further improvement of this utility model, it also includes a descaling device; the inlet and outlet of the descaling device are both connected to the water supply pipe connecting the medium-deep buried pipe heat exchange unit and the terminal heating loop.

[0010] As a further improvement of this utility model, the descaling device also includes, in sequence, a filter screen, filter cotton, a flow meter, and a dosing device.

[0011] As a further improvement of this utility model, the descaling device also includes a flow amplification device.

[0012] As a further improvement of this utility model, the dosing device includes, in sequence, an injection pump, a pipeline, and a valve.

[0013] As a further improvement of this utility model, the medium-deep buried pipe heat exchange unit includes a heat exchange pipe and a ground source heat pump; the heat exchange pipe is connected to the ground source heat pump through a water supply pipe; the ground source heat pump is also connected to the terminal heating loop through a water supply pipe.

[0014] As a further improvement of this utility model, the heat storage unit includes a hot water storage tank and a second temperature sensor installed inside the hot water storage tank; the outlet and inlet of the hot water storage tank are both connected to a water supply pipe.

[0015] As a further improvement of this utility model, it also includes several valves; the first valve and the second valve are respectively installed on the first water supply pipe and the second water supply pipe connecting the solar collector and the heat storage unit; the third valve and the fourth valve are respectively installed on the third water supply pipe and the fourth water supply pipe connecting the heat storage unit and the medium-deep buried heat exchange unit; the fifth valve and the sixth valve are respectively installed on the fifth water supply pipe and the sixth water supply pipe connecting the ground source heat pump and the heat exchange pipe; the eighth valve and the ninth valve are respectively installed on the eighth water supply pipe and the ninth water supply pipe connecting the heat storage unit and the terminal heating loop; the seventh valve is installed on the seventh water supply pipe connecting the eighth water supply pipe and the ninth water supply pipe, and is used to realize the mixing control of the supply and return water; the tenth valve and the eleventh valve are respectively installed on the tenth water supply pipe and the eleventh water supply pipe connecting the ground source heat pump and the terminal heating loop.

[0016] As a further improvement of this utility model, it also includes several circulating water pumps; the first circulating water pump is installed on the first water supply pipe; the second circulating water pump is installed on the fifth water supply pipe; and the third circulating water pump is installed on the ninth or eleventh water supply pipe.

[0017] This utility model has the following beneficial effects:

[0018] This invention fully utilizes solar energy for reinjection heating during the non-heating season, improving the energy efficiency of the ground source heat pump heating system. During the heating season, the solar collector collects and stores heat, which is then transferred to the terminal heating loop via a heat storage unit, achieving efficient and environmentally friendly heating. Simultaneously, the medium-deep underground pipe heat exchange unit can also transfer heat to the terminal heating loop, reducing reliance on fossil fuels, improving energy efficiency, and lowering heating costs. During the non-heating season, the heat storage unit transfers heat to the medium-deep underground pipe heat exchange unit, achieving reinjection heating.

[0019] Preferably, the operating status of the heating system can be monitored in real time by measuring the temperature of the medium in the water pipe, and the system operating status can be automatically adjusted according to temperature changes to optimize energy use.

[0020] Preferably, the descaling device can remove scale from the water pipes, ensuring the normal operation of the heating system, thereby improving the heating effect and extending the system life.

[0021] Preferably, by using a combination of filter screen, filter cotton, flow meter and dosing device, the water flow can be effectively purified, preventing scale accumulation from affecting system performance. At the same time, chemical agents can be added through the dosing device to prevent corrosion and further remove scale.

[0022] Preferably, the flow expansion device can increase the flow area of ​​the fluid, slow down the flow rate, promote the sedimentation of solid particles, and further improve the descaling effect.

[0023] Preferably, the injection pump, pipelines, and valves can precisely control the amount of agent added, effectively preventing pipeline corrosion and maintaining water quality. Simultaneously, the valves can also control the opening and closing of the pipelines, ensuring the safe storage of the scale inhibitor.

[0024] Alternatively, geothermal energy can be transferred to a ground source heat pump via heat exchange pipes, and the ground source heat pump can then output heat for heating. This method can make full use of geothermal energy and improve the energy efficiency and environmental friendliness of the heating system.

[0025] Preferably, the hot water storage tank can store the heat collected by the solar collector and release it to the heating system when needed; the second temperature sensor can monitor the temperature inside the hot water storage tank in real time to ensure effective management and release of thermal energy.

[0026] Optionally, by adjusting the valves, the water flow in the water supply pipes between the solar collector, the medium-deep buried pipe heat exchange unit, and the heat storage unit can be flexibly controlled to achieve the optimal operating state under different modes, thereby improving the system's adaptability and energy-saving effect.

[0027] Preferably, the circulating water pump can drive the flow of the medium in the transmission water pipe, which can ensure the stable circulation of water in the system; by adjusting the speed and flow rate of the circulating water pump, the operating efficiency and energy efficiency of the heating system can be further optimized. Attached Figure Description

[0028] The accompanying drawings described herein are for illustrative purposes only and do not limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. In the drawings:

[0029] Figure 1 This is a schematic diagram of a ground source heat pump heating system that utilizes solar energy for heat replenishment during the non-heating season, as described in Example 1.

[0030] Figure 2 This is a schematic diagram of a ground source heat pump heating system that utilizes solar energy for heat replenishment during the non-heating season, as described in Example 2.

[0031] The components include: 1. Solar collector; 2. Heat storage unit; 3. Medium-deep buried pipe heat exchange unit; 4. Ground source heat pump; 5. First valve; 6. Second valve; 7. Third valve; 8. Fourth valve; 9. Fifth valve; 10. Sixth valve; 11. Seventh valve; 12. Eighth valve; 13. Ninth valve; 14. Tenth valve; 15. Eleventh valve; 16. First circulating water pump; 17. Second circulating water pump; 18. Third circulating water pump; 19. First water supply pipe; 20. Second water supply pipe; 21. Third water supply pipe; 22. Fourth water supply pipe; 23. Fifth water supply pipe; 24. Sixth water supply pipe; 25. Seventh water supply pipe; 26. Eighth water supply pipe; 27. Ninth water supply pipe; 28. Tenth water supply pipe; 29. ​​Eleventh water supply pipe; 30. Terminal heating loop; 31. First temperature sensor; 32. Second temperature sensor; 33. Display device; 34. Descaling device. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0033] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] Example 1

[0036] like Figure 1 The above describes a ground source heat pump heating system that utilizes solar energy for heat replenishment during the non-heating season. It includes a solar collector 1, a medium-deep buried pipe heat exchange unit 3, a heat storage unit 2, a water pipe, and a temperature sensor.

[0037] The solar collector 1 is connected to the heat storage unit 2 via the first water pipe 19 and the second water pipe 20. The heat storage unit 2 is connected to the medium-deep underground pipe heat exchange unit 3 via the third water pipe 21 and the fourth water pipe 22, and is also connected to the terminal heating loop 30 via the eighth water pipe 26 and the ninth water pipe 27. The medium-deep underground pipe heat exchange unit 3 includes heat exchange pipes and a ground source heat pump 4. The heat exchange pipes are connected to the ground source heat pump 4 via the sixth water pipe 24 and the seventh water pipe 25. The ground source heat pump 4 is also connected to the terminal heating loop 30 via the tenth water pipe 28 and the eleventh water pipe 29. Odd-numbered sequence water pipes are return water pipes, and even-numbered sequence water pipes are supply water pipes.

[0038] The seventh valve 11 is installed on the seventh water supply pipe 25, which connects the eighth and ninth water supply pipes 27, and is used to realize the mixing control of supply and return water.

[0039] The first temperature sensor 31 is installed in the third water pipe 21 or the fifth water pipe 23 of the medium-deep buried pipe heat exchange unit 3 to monitor the temperature of the medium flowing out of the heat exchange pipe, so as to determine the operating status of the medium-deep buried heat exchange unit and guide the timing of reinjection.

[0040] The heat storage unit 2 includes a hot water storage tank and a second temperature sensor 32 installed inside the hot water storage tank. The second temperature sensor 32 is used to monitor the temperature of the medium in the hot water storage tank to determine whether the temperature is suitable for heating the terminal heating loop 30. The inlet of the hot water storage tank is connected to the second water supply pipe 20 and the fourth water supply pipe 22, and the outlet of the hot water storage tank is connected to the first water supply pipe 19 and the third water supply pipe 21, respectively.

[0041] The first temperature sensor 31 and the second temperature sensor 32 transmit the collected temperature data to the display device 33 so that staff can monitor the data in real time.

[0042] The first valve 5 and the second valve 6 are respectively installed on the first water supply pipe 19 and the second water supply pipe 20 connecting the solar collector 1 and the heat storage unit 2; the third valve 7 and the fourth valve 8 are respectively installed on the third water supply pipe 21 and the fourth water supply pipe 22 connecting the heat storage unit 2 and the medium-deep buried heat exchange unit; the fifth valve 9 and the sixth valve 10 are respectively installed on the fifth water supply pipe 23 and the sixth water supply pipe 24 connecting the ground source heat pump 4 and the heat exchange pipe; the eighth valve 12 and the ninth valve 13 are respectively installed on the eighth water supply pipe 26 and the ninth water supply pipe 27 connecting the heat storage unit 2 and the terminal heating loop 30; the seventh valve 11 is installed on the seventh water supply pipe 25 connecting the eighth water supply pipe 26 and the ninth water supply pipe 27, and is used to realize the mixing control of the supply and return water; the tenth valve 14 and the eleventh valve 15 are respectively installed on the tenth water supply pipe 28 and the eleventh water supply pipe 29 connecting the ground source heat pump 4 and the terminal heating loop 30. The system also includes several circulating water pumps; the first circulating water pump 16 is installed on the first water supply pipe 19; the second circulating water pump 17 is installed on the fifth water supply pipe 23; and the third circulating water pump 18 is installed on the eleventh water supply pipe 29.

[0043] The operating principle of this embodiment is as follows:

[0044] When facing the heating load during the heating season in cold and frigid regions, solar-assisted deep underground pipe heat exchangers are used to provide heating to users. Solar collector 1 collects solar radiation heat for the system. The first valve 5 and the second valve 6, as well as the first circulating water pump 16 of the heat collection loop, are opened. The medium in the hot water storage tank flows into the solar collector 1, absorbs the radiation heat from the sun, and then flows back into the hot water storage tank, storing the solar heat in the hot water storage tank.

[0045] During the heating season, the third valve 7 and the fourth valve 8 of the heat replenishment loop remain closed. When solar energy resources are sufficient, i.e., when the temperature of the hot water storage tank meets the heating demand, the eighth valve 12 and the ninth valve 13 of the hot water storage tank heating loop are opened to use the solar energy stored heat to heat the terminal heating loop 30. The seventh valve 11 can be electrically controlled to regulate the opening and closing of the seventh water supply pipe 25 to achieve the mixing control of the supply and return water of the eighth water supply pipe 26 and the ninth water supply pipe 27, thereby avoiding a large amount of heat loss due to excessively high heating water temperature.

[0046] When solar energy resources are insufficient at night or during cloudy / rainy weather, i.e., when the water temperature in the hot water storage tank is insufficient to meet heating needs, the medium-deep buried pipe heat exchanger-ground source heat pump loop starts operating. The seventh valve 11, eighth valve 12, and ninth valve 13 on the hot water storage tank heating loop are closed, while the fifth valve 9, sixth valve 10 on the medium-deep buried pipe heat exchanger side and the tenth valve 14 and eleventh valve 15 on the ground source heat pump heating loop are opened. Water from the ground source heat pump 4 is then used for terminal heating. At this time, the solar collector loop continues to operate. When the hot water storage tank temperature meets heating needs, solar energy is used again for terminal heating. Introducing solar-assisted heating helps reduce the operating time and energy consumption of the buried pipe heat exchanger-ground source heat pump loop, thereby significantly reducing the system's operating energy consumption.

[0047] During the non-heating season, hot water from the solar storage tank is reinjected into the soil via a buried pipe heat exchanger. A two-stage temperature control system manages the start and stop of the heat reinjection loop. First, similar to the temperature control during the heating season, when the storage tank temperature meets the heat reinjection requirements, and the outlet water temperature is monitored by the first temperature sensor 31 at the outlet of the buried pipe heat exchanger, if the outlet water temperature does not reach 90% of the initial heating season temperature, the automatic temperature control system outputs a control signal to close valves 11, 12, 13, 14, and 15 of the heating loop, and opens valves 7, 8, 9, 14, and 10 on the buried pipe heat exchanger side of the heat reinjection loop. Hot water from the storage tank flows into the buried pipe heat exchanger through the heat reinjection loop to exchange heat with the soil, thus achieving heat reinjection and promoting the recovery of ground temperature at a depth of 2000-3000 meters, ensuring the system's operational stability. If the temperature of the hot water storage tank is too low to meet the heat reinjection requirements, then close the third valve 7, the fourth valve 8, the fifth valve 9, and the sixth valve 10, and the heat reinjection process will stop.

[0048] It should be noted that the default setting for the heat replenishment loop is to check the water temperature in the hot water storage tank after 24 hours of operation. If the temperature of the hot water storage tank drops below 70% of the initial temperature at which the heat replenishment started, the automatic temperature control system will output a control signal to close valves 7 (third valve), 8 (fourth valve), 9 (fifth valve), and 10 (sixth valve), stopping the heat reinjection process. Subsequently, the system will re-determine whether to restart the heat replenishment loop based on the hot water storage tank temperature.

[0049] The advantages of this system are twofold: firstly, it enhances the utilization rate of surplus solar energy during the non-heating season by coupling solar energy and medium-deep geothermal energy; secondly, it promotes the recovery of the temperature of medium-deep soil and rock at a depth of about 2000-3000 meters, reduces the impact of the operation of the buried pipe heat exchanger on the surrounding soil, and ensures the efficient and continuous utilization of medium-deep geothermal energy.

[0050] Example 2

[0051] The difference between this embodiment and Embodiment 1 is that:

[0052] like Figure 2 As shown, the system also includes a descaling device 34; the inlet and outlet of the descaling device 34 are respectively connected to the sixth water supply pipe 24. The descaling device can remove scale from the water supply pipe, ensuring the normal operation of the heating system, thereby improving the heating effect and extending the system life.

[0053] The descaling device 34 further includes, in sequence, a filter screen, filter cotton, a flow meter, a dosing device, and a flow amplification device. The flow amplification device increases the fluid flow area, slows down the flow velocity, promotes the sedimentation of solid particles, and further improves the descaling effect. The dosing device includes, in sequence, an injection pump, pipes, and valves. The pipes and valves of the dosing device are typically made of stainless steel to ensure their corrosion resistance and durability. The injection pump is responsible for accurately adding the prepared scale inhibitor solution to the medium in the water delivery pipe according to the set ratio and flow rate.

[0054] This embodiment does not include the first temperature sensor 31, the second temperature sensor 32, and the display device 33.

[0055] The above embodiments are merely one of the implementation methods for achieving the technical solution of this utility model. The scope of protection claimed by this utility model is not limited to this embodiment, but also includes any variations, substitutions, and other implementation methods that are easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A ground-source heat pump heating system that utilizes solar energy for heat replenishment during the non-heating season, characterized in that, The system includes a solar collector (1), a medium-deep underground pipe heat exchange unit (3), a heat storage unit (2), a water supply pipe, and a temperature sensor. The solar collector (1) is connected to the heat storage unit (2) through the water supply pipe. The heat storage unit (2) is connected to the medium-deep underground pipe heat exchange unit (3) and the terminal heating loop (30) through the water supply pipe. The medium-deep underground pipe heat exchange unit (3) is connected to the terminal heating loop (30) through the water supply pipe. The temperature sensor is used to monitor the system's operating status and guide the timing of reinjection.

2. A ground source heat pump heating system utilizing solar energy for heat replenishment during the non-heating season, as described in claim 1, is characterized in that... It also includes a first temperature sensor (31); the first temperature sensor (31) is installed in the water supply pipe of the deep underground pipe heat exchange unit (3) and is used to monitor the temperature of the medium in the water supply pipe.

3. A ground source heat pump heating system utilizing solar energy for heat replenishment during the non-heating season, as described in claim 1, is characterized in that... It also includes a descaling device (34); the inlet and outlet of the descaling device (34) are connected to the water supply pipe connecting the medium-deep buried pipe heat exchange unit (3) and the terminal heating loop (30).

4. A ground source heat pump heating system utilizing solar energy for heat replenishment during the non-heating season, as described in claim 3, is characterized in that... The descaling device (34) also includes, in sequence, a filter screen, filter cotton, a flow meter, and a dosing device.

5. A ground source heat pump heating system utilizing solar energy for heat replenishment during the non-heating season, as described in claim 4, is characterized in that... The descaling device (34) also includes a flow amplification device.

6. A ground source heat pump heating system utilizing solar energy for heat replenishment during the non-heating season, as described in claim 4, is characterized in that... The dosing device includes, in sequence, an injection pump, a pipeline, and a valve.

7. A ground source heat pump heating system utilizing solar energy for heat replenishment during the non-heating season, as described in claim 1, is characterized in that... The medium-deep buried pipe heat exchange unit (3) includes a heat exchange pipe and a ground source heat pump (4); the heat exchange pipe is connected to the ground source heat pump (4) through a water supply pipe; the ground source heat pump (4) is also connected to the terminal heating loop (30) through a water supply pipe.

8. A ground source heat pump heating system utilizing solar energy for heat replenishment during the non-heating season, as described in claim 1, is characterized in that... The heat storage unit (2) includes a hot water storage tank and a second temperature sensor (32) installed inside the hot water storage tank; the outlet and inlet of the hot water storage tank are both connected to the water supply pipe.

9. A ground source heat pump heating system utilizing solar energy for heat replenishment during the non-heating season, as described in claim 7, is characterized in that... It also includes several valves; the first valve (5) and the second valve (6) are respectively installed on the first water supply pipe (19) and the second water supply pipe (20) connecting the solar collector (1) and the heat storage unit (2); the third valve (7) and the fourth valve (8) are respectively installed on the third water supply pipe (21) and the fourth water supply pipe (22) connecting the heat storage unit (2) and the medium-deep buried heat exchange unit; the fifth valve (9) and the sixth valve (10) are respectively installed on the fifth water supply pipe (23) and the sixth water supply pipe (24) connecting the ground source heat pump (4) and the heat exchange pipe. The eighth valve (12) and the ninth valve (13) are respectively installed on the eighth water supply pipe (26) and the ninth water supply pipe (27) connecting the heat storage unit (2) and the terminal heating loop (30); the seventh valve (11) is installed on the seventh water supply pipe (25) connecting the eighth water supply pipe (26) and the ninth water supply pipe (27) to realize the mixing control of supply and return water; the tenth valve (14) and the eleventh valve (15) are respectively installed on the tenth water supply pipe (28) and the eleventh water supply pipe (29) connecting the ground source heat pump (4) and the terminal heating loop (30).

10. A ground source heat pump heating system utilizing solar energy for heat replenishment during the non-heating season, as described in claim 9, is characterized in that... It also includes several circulating water pumps; the first circulating water pump (16) is installed on the first water supply pipe (19); the second circulating water pump (17) is installed on the fifth water supply pipe (23); and the third circulating water pump (18) is installed on the ninth water supply pipe (27) or the eleventh water supply pipe (29).

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