Ground source heat pump air conditioning system capable of achieving cross-seasonal cold storage through combination of gravity assisted heat pipe and partitioned pipe burying

Abstract

The utility model discloses a soil source heat pump air conditioning system combining gravity assisted heat pipes with zoned pipe burying and cross-seasonal cold storage. The soil source heat pump air conditioning system comprises a first pipe burying area, a second pipe burying area and a soil source heat pump unit. Wherein the soil source heat pump unit communicates with the first ground heat exchanger and the second ground heat exchanger in a switchable mode, and the one-way heat exchanger is used for releasing heat from first soil to surface air in a one-way mode. In this way, when the ground air temperature is lower than the first soil temperature in the cold supply period (summer), heat absorbed by the first soil is released into the ground air through the gravity heat pipe, and then the refrigeration energy efficiency of the ground source heat pump unit can be improved; when the ground air temperature is lower than the first soil temperature in the non-cooling period of the air conditioner, the one-way heat exchanger can transmit heat in the first soil to the ground air in a one-way mode, cross-seasonal cold storage of the first soil can be achieved for a long time, and the refrigeration energy efficiency of the ground source heat pump air conditioning system is higher in the cooling period of the air conditioner in the next year.

Description

Technical Field

[0001] The present application relates to the technical field of soil source heat pumps, and in particular to a soil source heat pump air conditioning system that combines gravity heat pipes with zoned buried pipes for cross-seasonal cold storage. Background Art

[0002] Shallow geothermal energy has great environmental and economic value. In order to utilize shallow geothermal energy, there is currently a soil source heat pump air conditioning system. During summer air conditioning, the heat in the building is transferred through the soil source heat pump unit and then released into the shallow soil through the buried pipe heat exchanger. At the same time, the shallow soil is used to store heat for winter heating. During winter air conditioning heating, heat is taken from the shallow soil through the buried pipe heat exchanger, and then the heat is lifted by the soil source heat pump unit to heat the building. At the same time, the shallow soil is used to store cold for summer cooling, and this cycle is repeated. However, for buildings where the cumulative cooling load of air conditioning is greater than the heating load throughout the year, because the heat released to the shallow soil by the soil source heat pump air conditioning system each year is greater than the heat absorbed, the thermal balance of the shallow soil will be broken over time, causing the temperature of the shallow soil to gradually increase, and then causing the refrigeration energy efficiency of the soil source heat pump air conditioning system to gradually decrease. In order to effectively improve the soil heat balance problem of the soil source heat pump air conditioning system, auxiliary heat dissipation methods such as cooling towers, heat recovery devices, and fountains are often used in the prior art to dissipate heat.

[0003] However, the above methods also have obvious defects, which are as follows: first, the energy efficiency of using the soil source heat pump air-conditioning system in the auxiliary heat dissipation stage is lower than the energy efficiency of using the soil source heat pump air-conditioning system when the soil thermal balance is not broken; second, when the ground air temperature is lower than the soil temperature, the coldness of the ground air is not used for cross-seasonal cold storage, and thus the advantages of the soil source heat pump air-conditioning system are not fully utilized. Summary of the invention

[0004] The present invention discloses a soil source heat pump air conditioning system that combines a gravity heat pipe with a zoned buried pipe for cross-seasonal cold storage. The system can make the soil source heat pump unit more efficient in transporting excess heat. In addition, the coldness of the ground air can be used for cross-seasonal cold storage, making the cooling effect in the cooling season more obvious.

[0005] In order to achieve the above-mentioned object, in the first aspect, the present invention discloses a soil source heat pump system, which includes: a first buried pipe area, a second buried pipe area and a soil source heat pump unit. Among them, the first buried pipe area includes a first buried pipe heat exchanger, a gravity heat pipe and a first soil, and the first buried pipe heat exchanger and the gravity heat pipe are both buried in the first soil. The second buried pipe area includes a second buried pipe heat exchanger and a second soil, and the second buried pipe heat exchanger is buried in the second soil. The soil source heat pump unit is switchably connected with the first buried pipe heat exchanger and the second buried pipe heat exchanger respectively, and the soil source heat pump unit is used to absorb heat from the second soil or release heat to the second soil through the second buried pipe heat exchanger when connected with the second buried pipe heat exchanger, and the soil source heat pump unit is used to release heat to the first soil through the first buried pipe heat exchanger when connected with the first buried pipe heat exchanger, and the gravity heat pipe is used to release heat from the first soil to the outside in one direction.

[0006] Optionally, the first ground pipe heat exchanger includes one or more of a horizontal ground pipe heat exchanger and a vertical ground pipe heat exchanger; and / or the second ground pipe heat exchanger includes one or more of a horizontal ground pipe heat exchanger and a vertical ground pipe heat exchanger.

[0007] Optionally, the vertical buried heat exchanger is buried in a vertical hole, the gravity heat pipe is buried in the vertical hole, and the remaining space in the vertical hole is filled with backfill material.

[0008] Optionally, the first ground heat exchanger includes a plurality of vertical ground heat exchangers, the gravity heat pipe includes a plurality of gravity heat pipes, and the plurality of vertical ground heat exchangers and the plurality of gravity heat pipes are arranged crosswise.

[0009] Optionally, the gravity heat pipe extends in a vertical direction.

[0010] Optionally, the soil source heat pump system further includes a circulation pipe network, through which the soil source heat pump unit is switchably connected to the first buried pipe heat exchanger and the second buried pipe heat exchanger, respectively, and the circulation pipe network includes: a water distribution device and a circulation power device. Among them, the water distribution device includes a first water distribution port, a second water distribution port and a third water distribution port, the water outlet of the soil source heat pump unit is connected to the first water distribution port, the second water distribution port and the third water distribution port are respectively connected to the first buried pipe heat exchanger and the second buried pipe heat exchanger, the first buried pipe heat exchanger and the second buried pipe heat exchanger are both connected to the water inlet of the soil source heat pump unit, and the water distribution device is used to make the first water distribution port switchably connected to the second water distribution port and the third water distribution port. The circulation power device is used to provide power for the heat transfer medium to flow between the soil source heat pump unit, the first buried pipe heat exchanger and the second buried pipe heat exchanger.

[0011] Optionally, the circulation pipe network further includes: a return water main pipe, a first return water pipe, a water collecting device, a first water supply pipe, a second return water pipe, a second water supply pipe and a water supply main pipe. One end of the return water main pipe is connected to the water outlet of the soil source heat pump unit, and the other end is connected to the first water outlet. The first return water pipe is connected between the second water outlet and the water inlet of the first buried pipe heat exchanger.

[0012] The first water supply pipe is connected between the water outlet of the first ground heat exchanger and the water collection device. The second water return pipe is connected between the third water outlet and the water inlet of the second ground heat exchanger. The second water supply pipe is connected between the water outlet of the second ground heat exchanger and the water collection device. One end of the water supply main is connected to the water collection device, and the other end is connected to the water inlet of the soil source heat pump unit, and the circulation power device is arranged on the water supply main.

[0013] Optionally, the circulation pipe network system further includes a water treatment device, which is disposed on the water supply main and is used for purifying the heat transfer medium.

[0014] Optionally, the circulation pipe network also includes an automatic switching control system, which is used to control the soil source heat pump unit to be connected with the first buried pipe heat exchanger during the air-conditioning cooling season, when the soil source heat pump unit is connected with the second buried pipe heat exchanger and the temperature of the heat transfer medium inside the second buried pipe heat exchanger is higher than the first temperature, and to control the soil source heat pump unit to be connected with the second buried pipe heat exchanger when the soil source heat pump unit is connected with the first buried pipe heat exchanger and the temperature of the heat transfer medium inside the second buried pipe heat exchanger is lower than the second temperature.

[0015] Optionally, the automatic switching control system includes: a valve assembly, a temperature detection element and a control system. The valve assembly can control the opening and closing of the first ground pipe heat exchanger and the second ground pipe heat exchanger. The temperature detection element can measure the measured temperature of the heat transfer medium inside the second ground pipe heat exchanger. The control system is provided with a preset temperature range inside, can obtain the measured temperature, compare and analyze the measured temperature with the preset temperature range, and control the opening and closing of the valve assembly according to the comparison and analysis results.

[0016] Compared with the related art, the beneficial effects of the present application are at least:

[0017] Since the soil source heat pump unit is switchably connected to the first buried pipe heat exchanger and the second buried pipe heat exchanger respectively and the second buried pipe heat exchanger is buried in the second soil, during the cooling period, when the temperature of the heat transfer medium inside the second buried pipe heat exchanger exceeds the maximum value of the preset temperature range, the electric valve can be switched to make the soil source heat pump unit stop connecting with the second buried pipe heat exchanger and start connecting with the first buried pipe heat exchanger, so that the building heat can be transported to the first buried pipe heat exchanger. Therefore, the soil source heat pump unit can simply and directly transport excess heat to other areas, which is more efficient than the auxiliary heat dissipation methods such as cooling towers, heat recovery devices and fountains used in related technologies to transport excess heat.

[0018] Since the first ground-buried heat exchanger and the gravity heat pipe are both buried in the first soil and the gravity heat pipe is used to release heat from the first soil to the outside in one direction, the excess heat can be transported to the first soil through the first ground-buried heat exchanger. When the ground air temperature is lower than the first soil temperature, the original heat of the first soil and the heat dissipation of the soil source heat pump unit absorbed by the first soil will be released to the ground air through the gravity heat pipe. Over time, the temperature of the first soil is gradually reduced, achieving the purpose of storing cold across seasons. In addition, since the soil source heat pump unit is connected to the first ground-buried heat exchanger, the cold energy can be transported to the soil source heat pump unit after the first soil stores cold energy, thereby increasing the cooling capacity of the soil source heat pump unit and making the cooling effect more obvious in the cooling season. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is one of the structural schematic diagrams of a soil source heat pump air conditioning system for storing cold across seasons using a gravity heat pipe combined with zoned buried pipes provided in an embodiment of the present application;

[0021] Figure 2 yes Figure 1 A top view of the soil source heat pump air conditioning system;

[0022] Figure 3 yes Figure 1 Schematic diagram of the structure of a medium gravity heat pipe;

[0023] Figure 4 yes Figure 1 A cross-sectional view of the first buried pipe area;

[0024] Figure 5 This is the second structural schematic diagram of a soil source heat pump air conditioning system for storing cold across seasons using a gravity heat pipe combined with zoned buried pipes provided in an embodiment of the present application;

[0025] Figure 6 yes Figure 5 A schematic diagram of the structure of the first buried pipe area;

[0026] Figure 7 yes Figure 5 Cross-sectional view of the first buried pipe area.

[0027] Description of reference numerals:

[0028] 1-first buried pipe area; 11-first buried pipe heat exchanger; 111-horizontal buried pipe heat exchanger; 112-vertical buried pipe heat exchanger; 12-gravity heat pipe; 1211-evaporation section; 1212-condensation section; 1213-insulation section; 13-first soil; 14-vertical hole;

[0029] 2-second buried pipe area; 21-second buried pipe heat exchanger; 22-second soil;

[0030] 3- Soil source heat pump unit;

[0031] 4-circulating pipe network; 401-water distribution device; 4011-first water distribution port; 4012-second water distribution port; 4013-third water distribution port; 402-circulating power device; 403-return water main; 404-first return water pipe; 405-water collecting device; 406-first water supply pipe; 407-second return water pipe; 408-second water supply pipe; 409-water supply main; 410-water treatment instrument; 411-automatic switching control system; 4111-valve assembly; 41111-valve; 4112-temperature detection element; 4113-control system. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0034] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0035] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0037] The technical solution of the present application will be further described below in conjunction with specific embodiments and drawings.

[0038] Figure 1 This is one of the structural schematic diagrams of a soil source heat pump air conditioning system that combines a gravity heat pipe with zoned buried pipes for cross-seasonal cold storage provided in an embodiment of the present application.

[0039] See also Figure 1The soil source heat pump system includes: a first buried pipe area 1, a second buried pipe area 2 and a soil source heat pump unit 3. The first buried pipe area 1 includes a first buried pipe heat exchanger 11, a gravity heat pipe 12 and a first soil 13, and the first buried pipe heat exchanger 11 and the gravity heat pipe 12 are both buried in the first soil 13. The second buried pipe area 2 includes a second buried pipe heat exchanger 21 and a second soil 22, and the second buried pipe heat exchanger 21 is buried in the second soil 22. The soil source heat pump unit 3 is switchably connected to the first buried pipe heat exchanger 11 and the second buried pipe heat exchanger 21 respectively. The soil source heat pump unit 3 is used to absorb heat from the second soil 22 or release heat to the second soil 22 through the second buried pipe heat exchanger 21 when connected with the second buried pipe heat exchanger 21. The soil source heat pump unit 3 is used to release heat to the first soil 13 through the first buried pipe heat exchanger 11 when connected with the first buried pipe heat exchanger 11. The gravity heat pipe 12 is used to release heat from the first soil 13 to the outside in one direction.

[0040] In the embodiment of the present application, since the soil source heat pump unit 3 is switchably connected to the first buried pipe heat exchanger 11 and the second buried pipe heat exchanger 21 respectively and the second buried pipe heat exchanger 21 is buried in the second soil 22, when the temperature of the second soil 22 exceeds the maximum value of the preset temperature range, the soil source heat pump unit 3 can be switched to stop connecting with the second buried pipe heat exchanger 21 and start connecting with the first buried pipe heat exchanger 11, so that excess heat can be transported to the first buried pipe heat exchanger 11. Therefore, the soil source heat pump unit 3 can simply and directly transport excess heat to other areas, which is more efficient than the auxiliary heat dissipation methods such as cooling towers, heat recovery devices and fountains used in related technologies to transport excess heat.

[0041] Next, since the first ground-mounted heat exchanger 11 and the gravity heat pipe 12 are both buried in the first soil 13 and the gravity heat pipe 12 is used to release heat from the first soil 13 to the outside in one direction, in this way, the excess heat can be transported to the first soil 13 through the first ground-mounted heat exchanger 11. When the ground air temperature is lower than the temperature of the first soil 13, the original heat of the first soil 13 and the heat dissipation of the soil source heat pump unit 3 absorbed by the first soil 13 will be released to the ground air through the gravity heat pipe 12. Over time, the temperature of the first soil 13 is gradually reduced, achieving the purpose of cross-season cold storage. In addition, since the soil source heat pump unit 3 is connected to the first ground-mounted heat exchanger 11, the first soil 13 can transport the cold to the soil source heat pump unit 3 after cold storage, thereby increasing the cooling capacity of the soil source heat pump unit 3, making the cooling effect in the cooling season more obvious.

[0042] Among them, the principle of using auxiliary heat dissipation methods such as cooling towers, heat recovery devices and fountains to transport excess heat in related technologies is: connecting the second soil 22 with an external heat dissipation device, and using the principle of heat transfer to slowly dissipate the excess heat into the ground air.

[0043] It should be noted that the above-mentioned soil source heat pump unit 3 is connected to the interior of the building and can exchange heat with the interior of the building, specifically including absorbing the cold in the building during the heating season and releasing the heat into the building; absorbing the heat in the building during the cooling season and releasing the cold into the building.

[0044] It should also be noted that the first soil 13 and the second soil 22 are both part of the above-mentioned shallow soil, and insulation treatment can be performed between the two. Generally, the distance between the two is made large enough to achieve the insulation effect. Other insulation treatment methods with the same effect can also be adopted, and the embodiments of the present application are not limited to this.

[0045] It should also be noted that the above-mentioned cold capacity is a virtual physical quantity, which represents the amount of heat absorbed by the object. The greater the cold capacity of an object, the more heat it needs to extract from itself to achieve this state, and the stronger its ability to absorb heat. Similarly, the above-mentioned cold storage refers to heat release, and the cold storage capacity refers to heat release.

[0046] It should also be noted that the above-mentioned preset temperature range refers to the basis for switchable connection between the ground source heat pump unit 3 and the first ground pipe heat exchanger 11 or the second ground pipe heat exchanger 21 in the ground source heat pump system.

[0047] It should also be noted that excess heat refers to the difference between the heat released to the shallow soil and the heat absorbed from the shallow soil by the ground source heat pump system in one year.

[0048] It should also be noted that the gravity heat pipe 12 can continuously transfer excess heat from the first soil 13 to the ground air. When the temperature of the ground air is lower than the temperature of the first soil 13, the original heat of the first soil 13 and the heat dissipated by the soil source heat pump unit 3 absorbed by the first soil 13 will be released to the ground air through the gravity heat pipe 12. As the outside temperature and the temperature of the first soil 13 change throughout the year, the heat in the first soil 13 is continuously transferred to the ground air by the gravity heat pipe 12, thereby achieving cold storage.

[0049] See also Figure 1In the cooling season, the soil source heat pump unit 3 absorbs the heat in the building and transfers the heat to the second ground pipe heat exchanger 21, and the second ground pipe heat exchanger 21 transfers the heat to the second soil 22 through heat transfer. The temperature of the second soil 22 will gradually rise. When it reaches the maximum value of the preset temperature range, the soil source heat pump unit 3 can be switched to stop communicating with the second ground pipe heat exchanger 21 and start communicating with the first ground pipe heat exchanger 11, so that the excess heat can be transferred to the first ground pipe heat exchanger 11. During the period when the soil source heat pump unit 3 stops communicating with the second ground pipe heat exchanger 21, the second soil 22 transfers its own heat to the shallower soil farther away through heat transfer. In this way, the temperature of the second soil 22 will gradually drop to the minimum value of the preset temperature range. At this time, the soil source heat pump unit 3 can be switched to stop communicating with the first ground pipe heat exchanger 11 and start communicating with the second ground pipe heat exchanger 21. The above switching process can be repeated.

[0050] After the excess heat is transported to the first ground heat exchanger 11, the first ground heat exchanger 11 transports the excess heat to the first soil 13 through heat transfer. The gravity heat pipe 12 transports the excess heat and the original heat of the first soil 13 from the first soil 13 to the ground air, and then transports the cold in the ground air to the first soil 13 for cold storage. The cold obtained by cold storage can be transported to the soil source heat pump unit 3 to increase the cooling capacity of the soil source heat pump unit 3.

[0051] In some embodiments, see Figure 1 and Figure 5 The first ground pipe heat exchanger 11 includes one or more of a horizontal ground pipe heat exchanger 111 and a vertical ground pipe heat exchanger 112; and / or the second ground pipe heat exchanger 21 includes one or more of a horizontal ground pipe heat exchanger 111 and a vertical ground pipe heat exchanger 112. Since the pipes of the horizontal ground pipe heat exchanger 111 are mainly horizontal pipes, and the pipes of the vertical ground pipe heat exchanger 112 are mainly vertical pipes, the size is easier to control during construction, thereby improving construction efficiency. In addition, when the horizontal pipe or the vertical pipe is buried in the first soil 13 together with the gravity heat pipe 12, the probability of the pipe crossing the gravity heat pipe 12 can be reduced, which is convenient for construction and further improves construction efficiency.

[0052] It should be noted that when the buried pipe area available on site is large and the temperature and thermal properties of the shallow soil are less affected by environmental conditions and the buried depth of the pipeline, the buried depth of the pipeline can be reduced, and the horizontal buried pipe heat exchanger 111 is used. When the buried pipe area available on site is small or the temperature and thermal properties of the shallow soil are greatly affected by environmental conditions and the buried depth of the pipeline, the buried depth of the pipeline must be increased, and the vertical buried pipe heat exchanger 112 is used. In addition, the selection of the horizontal buried pipe heat exchanger 111 and the vertical buried pipe heat exchanger 112 is also determined in combination with the scale of the building. The vertical buried pipe heat exchanger 112 is used when the building scale is large, and the horizontal buried pipe heat exchanger 111 is used when the building scale is small.

[0053] In some embodiments, see Figure 4 , the vertical buried heat exchanger 112 is located inside the vertical hole 14, the remaining space inside the vertical hole 14 is filled with soil, and the gravity heat pipe 12 is buried inside the vertical hole 14. Since the vertical buried heat exchanger 112 is located inside the vertical hole 14, the entire vertical buried heat exchanger 112 can be placed inside the vertical hole 14 drilled in advance during construction, thereby improving the construction efficiency. Then, since the remaining space inside the vertical hole 14 is filled with soil, the soil is compacted after being filled. However, for the soil, the higher its density, the better its thermal conductivity, so the thermal conductivity of the soil is enhanced. In addition, since the gravity heat pipe 12 is buried inside the vertical hole 14, it can be located in the same vertical hole 14 as the vertical buried heat exchanger 112. Compared with setting a vertical hole 14 separately for the gravity heat pipe 12, the construction efficiency is further improved and the construction cost is reduced.

[0054] In some embodiments, see Figure 1 and Figure 2 The first ground heat exchanger 11 includes a plurality of vertical ground heat exchangers 112, and the gravity heat pipe 12 includes a plurality of vertical ground heat exchangers 112 and a plurality of gravity heat pipes 12. In this way, when the plurality of vertical ground heat exchangers 112 transfer heat with the first soil 13, each part of the first soil 13 can absorb or release heat uniformly.

[0055] It should be noted that the above-mentioned crossing arrangement may be a crossing on a horizontal plane, a crossing on a vertical plane, a crossing on an inclined plane, or other crossing modes, which is not limited in the embodiments of the present application.

[0056] In some embodiments, see Figure 1 and Figure 3, the gravity heat pipe 12 extends in the vertical direction. The gravity heat pipe 12 includes an evaporation section 1211, a condensation section 1212 and an insulation section 1213, and its basic working principle is: the working liquid evaporates into gas when heated in the evaporation section 1211 of the gravity heat pipe 12, and absorbs a large amount of vaporization heat at the same time, and the steam flows rapidly to the condensation section 1212 under a small pressure difference, and the steam condenses on the inner wall of the condensation section 1212, during which a large amount of latent heat of vaporization is released, and the condensed liquid flows to the evaporation section 1211 along the pipe wall by gravity, and the insulation section 1213 plays the role of isolating the evaporation section 1211 and the condensation section 1212, so that the heat is transferred from the bottom end of the gravity heat pipe 12 to the top end in one direction. However, the heat of vaporization absorbed by the evaporation section 1211 of the gravity heat pipe 12 is the heat transferred from the first soil 13 to the gravity heat pipe 12, so that the excess heat absorbed by the first soil 13 and the original heat of the first soil 13 are released to the ground air. In addition, the gravity heat pipe 12 extends in the vertical direction, so that the total length of the gravity heat pipe 12 used to extend to the same depth is the shortest, further reducing the construction cost.

[0057] In some embodiments, see Figure 1 The soil source heat pump system also includes a circulation pipe network 4, through which the soil source heat pump unit 3 is switchably connected to the first ground pipe heat exchanger 11 and the second ground pipe heat exchanger 21, respectively. The circulation pipe network 4 includes a water distribution device 401 and a circulation power device 402. The water distribution device 401 includes a first water distribution port 4011, a second water distribution port 4012 and a third water distribution port 4013. The water outlet of the soil source heat pump unit 3 is connected to the first water distribution port 4011, the second water distribution port 4012 and the third water distribution port 4013 are connected to the first ground pipe heat exchanger 11 and the second ground pipe heat exchanger 21, respectively. The first ground pipe heat exchanger 11 and the second ground pipe heat exchanger 21 are both connected to the water inlet of the soil source heat pump unit 3. The water distribution device 401 is used to make the first water distribution port 4011 switchably connected to the second water distribution port 4012 and the third water distribution port 4013. The circulation power device 402 is used to provide power for the heat transfer medium to flow between the soil source heat pump unit 3 , the first ground pipe heat exchanger 11 and the second ground pipe heat exchanger 21 .

[0058] In the embodiment of the present application, since the heat-conducting medium can be contained inside the circulation pipe network 4, and the heat-conducting medium has fluidity and a large specific heat capacity, heat can be transferred by the heat-conducting medium flowing inside the circulation pipe network 4, thereby improving the efficiency of heat transfer. Then, since the flow rate of the heat-conducting medium can be artificially controlled, the efficiency of heat transfer can be artificially controlled.

[0059] It should be noted that the water separation device 401 is a device capable of dividing a stream of heat-conducting medium into multiple streams of heat-conducting medium, and may be a water separator, a tee pipe, or other devices with the same function, which is not limited in the embodiment of the present application.

[0060] It should also be noted that the above-mentioned circulation power device 402 can be a water pump, a turbine, or other devices that can provide circulation power, and the embodiment of the present application does not limit this.

[0061] It should also be noted that the above-mentioned heat-conducting medium refers to a fluid that can be used as a heat carrier, which can be a liquid or a gas. When it is a liquid, it can be water or a solution. The embodiments of the present application do not limit this.

[0062] In some embodiments, see Figure 1 The circulation pipe network 4 also includes: a return water main pipe 403, a first return water pipe 404, a water collecting device 405, a first water supply pipe 406, a second return water pipe 407, a second water supply pipe 408 and a water supply main pipe 409. One end of the return water main pipe 403 is connected to the water outlet of the soil source heat pump unit 3, and the other end is connected to the first water diversion port 4011. The first return water pipe 404 is connected between the second water diversion port 4012 and the water inlet of the first ground pipe heat exchanger 11. The first water supply pipe 406 is connected between the water outlet of the first ground pipe heat exchanger 11 and the water collecting device 405. The second return water pipe 407 is connected between the third water diversion port 4013 and the water inlet of the second ground pipe heat exchanger 21. The second water supply pipe 408 is connected between the water outlet of the second ground pipe heat exchanger 21 and the water collecting device 405. One end of the water supply main pipe 409 is connected to the water collecting device 405, and the other end is connected to the water inlet of the soil source heat pump unit 3, and the circulation power device 402 is arranged on the water supply main pipe 409. In this way, two parallel channels are formed between the return water main pipe 403 and the water supply main pipe 409, so that the first ground pipe heat exchanger 11 is separated from the second ground pipe heat exchanger 21, so that the soil source heat pump unit 3 can be more conveniently switched to be connected to the first ground pipe heat exchanger 11 or the second ground pipe heat exchanger 21.

[0063] It should be noted that the water collecting device 405 is a device that can collect multiple heat-conducting media into one heat-conducting medium. It can be a water collector, a three-way pipe, or other devices with the same function. The embodiment of the present application does not limit this.

[0064] In some embodiments, see Figure 1The circulating pipe network 4 system also includes a water treatment device 410, which is arranged on the water supply main 409 and is used to purify the heat-conducting medium. Since the heat-conducting medium contains impurities, such as mud, sand, and rust stains, the impurities will cause the internal pipes of the circulating power device 402 or the soil source heat pump unit 3 to be blocked during the flow of the heat-conducting medium, thereby causing a failure. However, the water treatment device 410 can purify and remove impurities, thereby reducing the failure rate of the soil source heat pump system and extending the service life of the circulating power device 402 and the soil source heat pump unit 3. At the same time, purifying and removing impurities in the heat-conducting medium can also make the heat-conducting medium flow more smoothly in the circulating pipe network 4 system, further improving the efficiency of heat transfer. In addition, the water treatment device 410 is installed on the water supply main pipe 409. Since one end of the water supply main pipe 409 is connected to the water collection device 405 and the other end is connected to the water inlet of the soil source heat pump unit 3, the heat transfer medium is directly transported from the water collection device 405 to the soil source heat pump unit 3. That is, the water supply main pipe 409 is the last channel through which the heat transfer medium passes before entering the soil source heat pump unit 3. Therefore, installing the water treatment device 410 on the water supply main pipe 409 can ensure that the heat transfer medium entering the soil source heat pump unit 3 has minimal impurities, which is beneficial to the protection of the soil source heat pump unit 3.

[0065] It should be noted that the water treatment device 410 may be a water purifier, a filter, or other devices with the same function, which is not limited in the embodiment of the present application.

[0066] In some embodiments, see Figure 1 The circulation pipe network 4 also includes an automatic switching control system 411. The automatic switching control system 411 is used to control the soil source heat pump unit 3 to be connected to the first buried pipe heat exchanger 11 when the soil source heat pump unit 3 is connected to the second buried pipe heat exchanger 21 and the temperature of the heat transfer medium inside the second buried pipe heat exchanger 21 is higher than the first temperature during the air conditioning cooling season. When the soil source heat pump unit 3 is connected to the first buried pipe heat exchanger 11 and the temperature of the heat transfer medium inside the second buried pipe heat exchanger 21 is lower than the second temperature, the soil source heat pump unit 3 is controlled to be connected to the second buried pipe heat exchanger 21. In this way, the soil source heat pump unit 3 can be automatically switched to be connected to the first buried pipe heat exchanger 11 or the second buried pipe heat exchanger 21 only by setting the first temperature and the second temperature in the automatic switching control system 411, making the switching work more convenient.

[0067] It should be noted that the first temperature is the maximum value of the preset temperature range, and the second temperature is the minimum value of the preset temperature range.

[0068] In some embodiments, see Figure 1When the heat transfer medium is circulating water, the automatic switching control system 411 includes: a valve assembly 4111, a temperature detection element 4112 and a control system 4113. The valve assembly 4111 controls the opening and closing of the first ground pipe heat exchanger 11 and the second ground pipe heat exchanger 21. The temperature detection element 4112 can measure the measured temperature of the second ground pipe heat exchanger 21. The control system 4113 is internally provided with a preset temperature range, which can obtain the measured temperature, compare and analyze the measured temperature with the preset temperature range, and control the opening and closing of the valve assembly 4111 according to the comparison and analysis results. Among them, the valve assembly 4111 includes two valves 41111, and the two valves 41111 are respectively installed on the first return pipe 404 and the second return pipe 407. The temperature detection element 4112 is a temperature sensor. The control system 4113 is a PLC (Programmable Logic Controller) control system 4113, which is electrically connected to the temperature detection element 4112 and the valve assembly 4111 at the same time.

[0069] In the cooling season, the soil source heat pump unit 3 absorbs the heat in the building and transfers the heat to the second ground pipe heat exchanger 21 through the circulation pipe network 4 system, and the second ground pipe heat exchanger 21 transfers the heat to the second soil 22 through heat transfer. The temperature of the second soil 22 will gradually rise, which will cause the temperature of the heat-conducting medium in the second ground pipe heat exchanger 21 to gradually rise. When the temperature of the heat-conducting medium reaches the first temperature, the temperature sensor detects the measured temperature of the heat-conducting medium, and then the PLC control system 4113 will obtain the measured temperature and compare and analyze it with the preset temperature range. If the measured temperature is higher than the first temperature, the valve 41111 on the second return pipe 407 is controlled to be closed, and the valve 41111 on the first return pipe 404 is controlled to be opened, so that the excess heat can be transferred to the first ground pipe heat exchanger 11. During the period when the valve 41111 on the second return pipe 407 is closed, the heat transfer medium in the second ground pipe heat exchanger 21 does not flow. At this time, the second soil 22 transfers its own heat to the shallower soil through heat transfer. In this way, the temperature of the second soil 22 will gradually decrease, which will cause the temperature of the heat transfer medium in the second ground pipe heat exchanger 21 to gradually decrease, and finally the temperature of the heat transfer medium is close to the temperature of the second soil 22. When the temperature of the heat transfer medium drops to the second temperature, the temperature sensor detects the measured temperature of the heat transfer medium again, and then the PLC control system 4113 will obtain the measured temperature again and compare and analyze it with the preset temperature range. If the measured temperature is lower than the second temperature, the valve 41111 on the first return pipe 404 is controlled to be closed, and the valve 41111 on the second return pipe 407 is controlled to be opened, so that the excess heat can be transferred to the second ground pipe heat exchanger 21 again. The above switching process can be repeated.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A soil source heat pump air conditioning system with gravity heat pipe combined with zoned buried pipes for cross-seasonal cold storage, characterized in that: include: a first buried pipe area, wherein the first buried pipe area includes a first buried pipe heat exchanger, a gravity heat pipe and a first soil, and the first buried pipe heat exchanger and the gravity heat pipe are both buried in the first soil; a second buried pipe area, the second buried pipe area comprising a second buried pipe heat exchanger and a second soil, the second buried pipe heat exchanger being buried in the second soil; A soil source heat pump unit, the soil source heat pump unit is switchably connected to the first buried pipe heat exchanger and the second buried pipe heat exchanger respectively, the soil source heat pump unit is used to absorb heat from the second soil or release heat to the second soil through the second buried pipe heat exchanger when connected to the second buried pipe heat exchanger, the soil source heat pump unit is used to release heat to the first soil through the first buried pipe heat exchanger when connected to the first buried pipe heat exchanger, and the gravity heat pipe is used to release heat from the first soil to the ground air in one direction.

2. The ground source heat pump air conditioning system with gravity heat pipe combined with zoned buried pipe for cross-seasonal cold storage according to claim 1 is characterized in that: The first ground pipe heat exchanger includes one or more of a horizontal ground pipe heat exchanger and a vertical ground pipe heat exchanger; and / or, The second ground pipe heat exchanger includes one or more of a horizontal ground pipe heat exchanger and a vertical ground pipe heat exchanger.

3. The ground source heat pump air conditioning system with gravity heat pipe combined with zoned buried pipe for cross-seasonal cold storage according to claim 2 is characterized in that: The vertical buried heat exchanger is buried in a vertical hole, the gravity heat pipe is buried in the vertical hole, and the remaining space in the vertical hole is filled with backfill material.

4. The gravity heat pipe combined with zoned buried pipe cross-seasonal cold storage soil source heat pump air conditioning system according to claim 2 is characterized in that: The first ground-buried heat exchanger includes a plurality of vertical ground-buried heat exchangers, the gravity heat pipe includes a plurality of gravity heat pipes, and the plurality of vertical ground-buried heat exchangers and the plurality of gravity heat pipes are arranged crosswise.

5. The gravity heat pipe combined with zoned buried pipe cross-seasonal cold storage soil source heat pump air conditioning system according to claim 1 is characterized in that: The gravity heat pipe extends in a vertical direction.

6. The gravity heat pipe combined with zoned buried pipe cross-seasonal cold storage soil source heat pump air conditioning system according to any one of claims 1 to 5, characterized in that: The soil source heat pump air conditioning system further includes a circulation pipe network, through which the soil source heat pump unit is switchably connected to the first buried pipe heat exchanger and the second buried pipe heat exchanger, respectively, and the circulation pipe network includes: A water distribution device, the water distribution device comprising a first water distribution port, a second water distribution port and a third water distribution port, the water outlet of the soil source heat pump unit is connected to the first water distribution port, the second water distribution port and the third water distribution port are respectively connected to the water inlet of the first ground pipe heat exchanger and the water inlet of the second ground pipe heat exchanger, and the first ground pipe heat exchanger and the second ground pipe heat exchanger are both connected to the water inlet of the soil source heat pump unit; A circulation power device is used to provide power for the heat transfer medium to flow between the soil source heat pump unit, the first buried pipe heat exchanger and the second buried pipe heat exchanger.

7. The gravity heat pipe combined with zoned buried pipe cross-seasonal cold storage soil source heat pump air conditioning system according to claim 6 is characterized in that: The circulation pipe network also includes: A water return main pipe, one end of which is connected to the water outlet of the ground source heat pump unit, and the other end of which is connected to the first water outlet; a first water return pipe, the first water return pipe being connected between the second water outlet and the water inlet of the first buried heat exchanger; Water collection devices; A first water supply pipe, the first water supply pipe being connected between a water outlet of the first underground heat exchanger and the water collecting device; a second water return pipe, the second water return pipe being connected between the third water outlet and the water inlet of the second buried heat exchanger; A second water supply pipe, the second water supply pipe being connected between a water outlet of the second underground heat exchanger and the water collecting device; A water supply main pipe, one end of which is connected to the water collection device and the other end of which is connected to the water inlet of the soil source heat pump unit, and the circulation power device is arranged on the water supply main pipe.

8. The gravity heat pipe combined with zoned buried pipe cross-seasonal cold storage soil source heat pump air conditioning system according to claim 7 is characterized in that: The circulating pipe network system also includes a water treatment device, which is arranged on the water supply main pipe and is used to purify the heat transfer medium.

9. The gravity heat pipe combined with zoned buried pipe inter-seasonal cold storage soil source heat pump air conditioning system according to any one of claims 7-8, characterized in that: The circulation pipe network also includes an automatic switching control system, which is used to control the soil source heat pump unit to be connected with the first buried pipe heat exchanger during the air conditioning cooling season when the soil source heat pump unit is connected with the second buried pipe heat exchanger and the temperature of the heat transfer medium inside the second buried pipe heat exchanger is higher than the first temperature, and to control the soil source heat pump unit to be connected with the second buried pipe heat exchanger when the soil source heat pump unit is connected with the first buried pipe heat exchanger and the temperature of the heat transfer medium inside the second buried pipe heat exchanger is lower than the second temperature.

10. The gravity heat pipe combined with zoned buried pipe cross-seasonal cold storage soil source heat pump air conditioning system according to claim 9, characterized in that: The automatic switching control system comprises: A valve assembly, wherein the valve assembly can control the opening and closing of the first ground heat exchanger and the second ground heat exchanger; a temperature detection element, wherein the temperature detection element is capable of measuring the actual temperature of the heat transfer medium inside the second ground heat exchanger; A control system, wherein a preset temperature range is provided inside the control system, the measured temperature can be obtained, the measured temperature is compared and analyzed with the preset temperature range, and the opening and closing of the valve assembly is controlled according to the comparison and analysis result.

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