Heat supply system of solar coupling ground source heat pump

Abstract

The utility model relates to a solar energy coupling ground source heat pump heat supply system which comprises a ground source heat pump system, a solar energy system and a soil heat exchange pipe, a double-U-pipeline heat exchange water path is arranged in the soil heat exchange pipe, one heat exchange water path in the double-U-pipeline heat exchange water path exchanges heat with the solar energy system, and the other heat exchange water path in the double-U-pipeline heat exchange water path exchanges heat with the ground source heat pump system. The other heat exchange water way in the double-U-pipeline heat exchange water way exchanges heat with the ground source heat pump system, the heat exchange water way utilized by the ground source heat pump system only exchanges heat with the heat exchange water way utilized by the solar system, and the water ways are not communicated. According to the coupling system, only the ground source heat pump system and the solar energy system are installed in a combined mode, coupling is conducted on the soil heat exchange pipe side, the ground source heat pump system and the solar energy heat collection system can operate independently according to respective control logics, and the boundary conditions of all the independent systems are controlled through the independently researched and developed control system; the ground source heat pump system and the solar system can reach respective normal working condition ranges, and normal operation of the systems is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange equipment, in particular to a solar energy coupled ground source heat pump heating system. Background Art

[0002] At present, there is a problem of soil thermal imbalance when only using the ground source heat pump system for heating. In order to ensure the stable and economical operation of the ground source heat pump system, it is necessary to couple other heat sources for compensation. As a clean and renewable resource, solar energy resources are a very suitable way to couple heating with the ground source heat pump system. However, solar energy resources are limited by time and space and are unstable, which is an important factor limiting the coupling heating of solar energy resources and shallow geothermal energy resources. In order to fully utilize the advantages of the ground source heat pump system and the solar energy system, eliminate the thermal imbalance of the shallow soil, and improve the stability of solar energy resources in the system, it is an urgent problem to be solved for the continuous and stable operation of the coupling system. Utility Model Content

[0003] In order to ensure the stable operation of a ground source heat pump system and a solar energy system, the utility model provides a heating system of a solar energy coupled ground source heat pump.

[0004] The technical solution of this utility model:

[0005] A solar energy coupled ground source heat pump heating system comprises a ground source heat pump system, a solar energy system and a soil heat exchange pipe, wherein a double U-pipeline hot water exchange circuit is arranged in the soil heat exchange pipe, a first hot water exchange circuit in the double U-pipeline hot water exchange circuit exchanges heat with the solar energy system, a second hot water exchange circuit in the double U-pipeline hot water exchange circuit exchanges heat with the ground source heat pump system, and water in the first hot water exchange circuit is not connected to water in the second hot water exchange circuit.

[0006] Preferably, the geothermal heat pump system includes a geothermal heat pump main unit, a third circulation pump is arranged in the geothermal heat pump main unit, both sides of the geothermal heat pump main unit are respectively connected to the two ends of the second hot water exchange circuit in the double U-pipe hot water exchange circuit, and the geothermal heat pump main unit is also connected to the indoor unit.

[0007] Preferably, the double U-pipe water exchange water circuit is located in a soil heat exchange hole in outdoor soil, and there is no less than one soil heat exchange hole, which is a drilled hole set in the soil.

[0008] Preferably, the solar energy system includes a solar collector, which is connected to an insulated water tank. The solar collector is provided with a solar collector water inlet and a solar collector water outlet. The insulated water tank is provided with an insulated water tank first water outlet pipe and an insulated water tank first return water pipe. The insulated water tank first water outlet pipe is connected to the solar collector water inlet, the solar collector water outlet is connected to the insulated water tank first return water pipe, and the first circulating pump is provided on the insulated water tank first water outlet pipe.

[0009] Preferably, the insulated water tank is also connected to both ends of the first hot water exchange circuit, and a second circulation pump is provided on the first hot water exchange circuit.

[0010] Preferably, a first temperature sensor is arranged in the insulated water tank, a second temperature sensor is arranged on the solar collector, the first temperature sensor, the second temperature sensor, the first circulation pump and the second circulation pump are connected to a collection concentrator, and the collection concentrator is connected to 220V AC power.

[0011] Preferably, the two U-shaped tubes in the soil heat exchange hole are close to each other, and the voids in the hole are backfilled with bentonite and fine sand.

[0012] Preferably, a sewage outlet is provided on the thermal insulation water tank.

[0013] Preferably, a heater is provided in the insulated water tank, and the heater is connected to the collection concentrator.

[0014] Preferably, water can be replaced by other working fluids such as antifreeze.

[0015] Beneficial effects of the utility model:

[0016] The utility model provides an innovative coupling mode of a ground source heat pump system, a solar energy heat collection system and a soil heat storage system, wherein each system can operate independently and can also be coupled to each other.

[0017] In the case that the water lines of each system are not connected, the mutual conversion of various energy sources is achieved, and the efficiency of the ground source heat pump unit and the solar collector is improved; it not only realizes "storing (using) energy during the day and using it at night" during the heating season, but also realizes "storing energy in the summer and using it in the winter".

[0018] This coupling system improves the efficiency of ground source heat pump units and solar collectors in extremely cold and cold areas, and makes full use of solar energy resources and shallow geothermal energy; the ground source heat pump coupled with the solar energy system coupling mode increases the temperature of the shallow soil, thereby improving the operating conditions of the ground source heat pump, while reducing the inlet water temperature entering the solar collector and improving the thermal efficiency of the solar collector.

[0019] This utility model integrates and upgrades abundant and clean solar energy resources and stable and reliable geothermal resources into a composite new energy source, providing users with an energy-saving, efficient and flexible clean heating method in winter. It can realize the complementary advantages of solar energy resources and shallow geothermal resources, and the cross-season storage of solar thermal + geothermal in the application achieves the scientific energy use technology goal of compressible, storable, controllable and transferable solar thermal resources.

[0020] Compared with other heating technologies, the utility model ground source heat pump system coupled with solar energy system heating can save 30%-50% energy. The equipment can heat with one key, and the room temperature can be set to turn on when needed. It is convenient and flexible to use, and can realize the user to "turn on the room in which it is used". It makes users "useful, affordable, good and long-lasting" good technology.

[0021] The utility model makes full use of the stability characteristics of shallow geothermal energy in severe cold weather and adverse working conditions. The system operates stably and reliably, provides good heating effects for users and low operating costs, and can ensure normal heating for users.

[0022] The coupling system of the utility model is only a joint installation of a ground source heat pump system and a solar energy system, and the coupling is carried out on the soil heat exchange pipe side. The ground source heat pump system and the solar energy collection system can operate independently according to their own control logics. The boundary conditions of each independent system are controlled by a self-developed control system, so that the ground source heat pump system and the solar energy system can reach their own normal operating range without affecting the normal operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of Example 1 of the utility model.

[0024] Figure 2 This is a schematic diagram of the structure of Example 2 of the utility model.

[0025] Figure 3 It is a structural schematic diagram of the soil heat exchange hole of the utility model.

[0026] Figure 4 This is the control principle diagram of the utility model.

[0027] In the attached figure, 1-solar energy system, 2-soil heat exchange pipe, 3-ground source heat pump system, 4-insulated water tank, 5-heater, 6-first hot water exchange circuit, 7-second hot water exchange circuit, 8-collection concentrator;

[0028] 11-solar collector, 12-first water outlet pipe of the insulation water tank, 13-first water return pipe of the insulation water tank;

[0029] 21-soil heat exchange holes, 22-bentonite and fine sand.

[0030] 31-ground source heat pump host, 32-indoor unit;

[0031] 41- sewage outlet;

[0032] P1-first circulation pump, P2-second circulation pump, P3-third circulation pump, T1-first temperature sensor, T2-second temperature sensor. DETAILED DESCRIPTION

[0033] In order to further explain the technical means and effects adopted by the utility model to achieve the predetermined utility model purpose, the following is combined with the attached Figure 1-4 And preferred embodiments, the specific implementation methods, structures, features and effects of the utility model are described in detail as follows.

[0034] Example 1

[0035] A solar energy coupled ground source heat pump heating system comprises a ground source heat pump system 3, a solar energy system 1 and a soil heat exchange pipe 2, wherein a double U-pipeline hot water exchange circuit is arranged in the soil heat exchange pipe 2, a first hot water exchange circuit 6 in the double U-pipeline hot water exchange circuit exchanges heat with the solar energy system 1, a second hot water exchange circuit 7 in the double U-pipeline hot water exchange circuit exchanges heat with the ground source heat pump system 3, and water in the first hot water exchange circuit 6 is not connected to water in the second hot water exchange circuit 7.

[0036] The solar energy system 1 includes a solar collector 11, which is connected to an insulated water tank 4. The solar collector 11 is provided with a solar collector water inlet and a solar collector water outlet. The insulated water tank 4 is provided with a first insulated water tank outlet pipeline 12 and a first insulated water tank return pipeline 13. The first insulated water tank outlet pipeline 12 is connected to the solar collector water inlet, and the solar collector outlet is connected to the first insulated water tank return pipeline 13. The first insulated water tank outlet pipeline 12 is provided with a first circulating pump P1. The insulated water tank 4 is provided with a first temperature sensor T1 and a heater 5. The solar collector 11 is provided with a second temperature sensor T2. The first temperature sensor T1, the heater 5, the second temperature sensor T2, the first circulating pump P1 and the second circulating pump P2 are connected to a collection concentrator 8, and the collection concentrator 8 is connected to a 220V AC power supply. The model of the collection concentrator 8 is GLF-GZCJJZ-Ⅲ / 4GBA2201000-2401. The heat preservation water tank 4 is also connected to both ends of the first hot water exchange circuit 6 in the double U-pipe hot water exchange circuit of the solar energy system, and the first hot water exchange circuit 6 is provided with a second circulation pump P2.

[0037] The double U-pipe hot water exchange circuit is located in a soil heat exchange hole 21 in the outdoor soil. There are four soil heat exchange holes 21, which are drilled holes set in the soil. Two U-shaped pipes in the soil heat exchange hole 21 are close to each other, and the gaps in the hole are backfilled with bentonite and fine sand.

[0038] The ground source heat pump 3 system includes a ground source heat pump main unit 31, in which a third circulation pump P3 is arranged. Both sides of the ground source heat pump main unit 31 are respectively connected to the two ends of the second hot water exchange circuit 7 in the double U-pipe hot water exchange circuit. The ground source heat pump main unit 31 is also connected to the indoor unit 32, and the ground source heat pump main unit 31 is an outdoor unit.

[0039] The working process of the utility model is:

[0040] When there is light, the first temperature sensor T1 transmits the temperature information to the collection concentrator 8, and the collection concentrator 8 controls the first circulation pump P1 to start, and the water in the first water outlet pipe 12 and the first water return pipe 13 of the insulation water tank between the insulation water tank 4 and the solar collector 11 begins to circulate, and the water is heated by the solar collector 11 and then returns to the insulation water tank 4, and the light and heat energy is repeatedly collected into the insulation water tank 4. The insulation water tank 4 is provided with a sewage outlet 41 for sewage discharge.

[0041] The second temperature sensor T2 monitors the temperature of the water in the insulated water tank 4 and transmits the temperature information to the collection concentrator 8. When the temperature is lower than 4°C, the collection concentrator 8 controls the heater to keep it above 4°C to prevent the insulated water tank from freezing. When the temperature rises and the heat storage conditions are met, the collection concentrator 8 controls the second circulation pump P2 to start, and the water in the first hot water exchange circuit 6 between the insulated water tank 4 and the soil heat exchange tube 2 starts to circulate. After being cooled by the soil or the soil heat exchange tube 2, the water returns to the insulated water tank 4. This process is repeated to transfer the heat collected by the photothermal system to the soil and the second hot water exchange circuit 7.

[0042] In winter, when the geothermal heat pump main unit 31 is turned on (for heating), the third circulation pump P3 in the geothermal heat pump main unit 31 is turned on, and the water in the second hot water exchange circuit 7 between the geothermal heat pump main unit 31 and the soil heat exchange pipe 2 begins to circulate. After the water is heated by the soil and the first hot water exchange circuit 6, it returns to the geothermal heat pump main unit 31. In this way, the geothermal heat pump main unit 31 extracts underground heat repeatedly, and the geothermal heat pump main unit 31 supplies heat to the indoor unit 32 to heat the room.

[0043] In summer, when the geothermal heat pump main unit 31 is turned on (cooling), the indoor unit 32 transfers the indoor heat to the geothermal heat pump main unit 31, and the third circulation pump P3 in the geothermal heat pump main unit 31 is turned on. The water in the second water exchange circuit 7 between the geothermal heat pump main unit 31 and the soil heat exchange pipe 2 begins to circulate. After the water is cooled by the soil, it returns to the geothermal heat pump main unit 31. This is repeated. The heat pump main unit 31 releases heat to the ground to cool down the room.

[0044] In summer, the solar energy system uses solar thermal resources to heat the circulating water. When the circulating water temperature is higher than the underground soil temperature, the heat storage mode is turned on to store the solar energy in the underground soil for winter heating. The ground source heat pump transfers the room's heat to the underground soil through the circulating water through the cooling condition, storing heat for the winter while cooling in the summer.

[0045] Winter: The solar energy system uses photothermal resources to heat circulating water. When the circulating water temperature is higher than the underground soil temperature, the heat is transferred to the underground soil for soil heat storage and heat pump heating. The ground source heat pump transfers the heat of the underground soil and solar energy to the room through the operation of heating conditions for winter heating.

[0046] The ground source heat pump system 3 and the solar energy system 1 are connected to the soil heat exchange pipe 2 respectively, and the ground source heat pump system 3 and the solar energy system 1 can operate independently. At the same time, the water channels of the ground source heat pump system 3 and the solar energy system 1 are not connected, but the heat exchange pipes of the ground source heat pump system 3 and the heat exchange pipes of the solar energy system 1 are closely contacted by the soil in the underground soil heat exchange holes 21, which can realize the mutual heat exchange between the soil, the ground source heat pump system 3 and the solar energy system 1. The operation of the ground source heat pump system 3 can utilize shallow geothermal energy, shallow geothermal energy and solar energy; the operation of the solar energy system 1 can not only provide heat to the soil heat exchange pipe 2 and the ground source heat pump system 3 in the heating season, but also realize the heat storage of the soil in the non-heating season, achieving the goal of "cross-season heat storage".

[0047] During actual use and operation, the soil heat exchange 2 serves as both a technical form of utilizing shallow geothermal energy and an energy collection and buffering device for the ground source heat pump system 3 and the solar energy system 1, so that the use or control of the ground source heat pump system 3 is basically the same as that of a conventional ground source heat pump. The ground source heat pump system 3 operates stably and reliably, and will not exceed its operating range. The solar energy system 1 can operate independently, and can operate when there is sunlight and not operate when there is no sunlight. Heat is stored in the soil, and the normal operation of the entire system will not be affected by the volatility of solar energy resources.

[0048] Through the collection concentrator 8 control system, shallow geothermal energy and solar energy can be freely converted to each other without affecting the normal operation of each system, ensuring the safety and reliability of the system while making full use of the system economy, maximizing the advantages of shallow geothermal energy and solar energy.

[0049] Example 2

[0050] The technical feature of this embodiment that is different from that of Embodiment 1 is that there is one soil heat exchange hole 21 in this embodiment. Relatively speaking, the more soil heat exchange holes 21 there are, the larger the heat exchange area is, and the better the heat exchange effect is.

[0051] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A solar energy coupled ground source heat pump heating system, characterized in that: It includes a geothermal heat pump system, a solar energy system and a soil heat exchange pipe. A double U-pipe hot water exchange circuit is arranged in the soil heat exchange pipe. The first hot water exchange circuit in the double U-pipe hot water exchange circuit exchanges heat with the solar energy system, and the second hot water exchange circuit in the double U-pipe hot water exchange circuit exchanges heat with the geothermal heat pump system. Water in the first hot water exchange circuit is not connected to water in the second hot water exchange circuit.

2. A solar-coupled ground-source heat pump heating system according to claim 1, characterized in that: The geothermal heat pump system includes a geothermal heat pump main unit, in which a third circulation pump is arranged. Both sides of the geothermal heat pump main unit are respectively connected to the two ends of the second hot water exchange circuit in the double U-pipe hot water exchange circuit, and the geothermal heat pump main unit is also connected to the indoor unit.

3. A solar-coupled ground-source heat pump heating system according to claim 1, characterized in that: The double U-pipe hot water exchange circuit is located in a soil heat exchange hole in outdoor soil, and there is no less than one soil heat exchange hole, which is a drilled hole set in the soil.

4. A solar-coupled ground-source heat pump heating system according to claim 1, characterized in that: The solar energy system includes a solar collector, which is connected to an insulated water tank. The solar collector is provided with a solar collector water inlet and a solar collector water outlet. The insulated water tank is provided with a first insulated water tank outlet pipeline and a first insulated water tank return pipeline. The first insulated water tank outlet pipeline is connected to the solar collector water inlet, and the solar collector outlet is connected to the first insulated water tank return pipeline. The first insulated water tank outlet pipeline is provided with a first circulation pump.

5. A solar energy coupled ground source heat pump heating system according to claim 4, characterized in that: The heat preservation water tank is also connected to both ends of the first hot water exchange circuit, and the first hot water exchange circuit is provided with a second circulation pump.

6. A solar energy coupled ground source heat pump heating system according to claim 5, characterized in that: A first temperature sensor is arranged in the insulated water tank, a second temperature sensor is arranged on the solar collector, the first temperature sensor, the second temperature sensor, the first circulation pump and the second circulation pump are connected to a collection concentrator, and the collection concentrator is connected to 220V AC power.

7. A solar energy coupled ground source heat pump heating system according to claim 3, characterized in that: The two U-shaped tubes in the soil heat exchange hole are close to each other, and the gaps in the hole are backfilled with bentonite and fine sand.

8. A solar-coupled ground-source heat pump heating system according to claim 4, characterized in that: A sewage outlet is arranged on the thermal insulation water tank.

9. A solar-coupled ground-source heat pump heating system according to claim 6, characterized in that: A heater is arranged in the thermal insulation water tank, and the heater is connected to the collection concentrator.

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