Ground source heat pump soil structure and photo-thermal complementary system with ground source heat pump soil structure

Abstract

The utility model discloses a ground source heat pump soil structure and a photo-thermal complementary system with the ground source heat pump, the ground source heat pump soil structure comprises a buried pipe, the buried pipe comprises a pipe well, a U-shaped heat exchange medium flow channel is arranged in the pipe well, and a water-containing compact lime layer is arranged between the pipe well and the U-shaped heat exchange medium flow channel; a covering top layer and a gradual change ground source heat storage structure are arranged outside the buried pipe, and the covering top layer is arranged on the upper side of the gradual change ground source heat storage structure. The gradient ground source heat storage structure sequentially comprises a compact sand layer soil doping layer, a compact rock layer soil doping layer and an original soil layer from inside to outside. The gradient ground source heat storage structure is arranged outside the buried pipe, so that a heat exchange gradient is formed, and the heat exchange and heat storage effects are improved to the maximum extent.

Description

Technical Field

[0001] The utility model belongs to the field of energy conservation and environmental protection, and particularly relates to a ground source heat pump soil structure and a solar-thermal complementary system with the ground source heat pump. Background Art

[0002] A ground source heat pump is a new energy utilization technology that uses shallow geothermal energy for heating and cooling. It belongs to a type of heat pump. A heat pump is a device that transfers cold and heat using the principles of the Carnot cycle and the reverse Carnot cycle. A ground source heat pump usually refers to a device that can transfer the heat or cold in the underground soil to the required place. Usually, heat pumps are used for air conditioning cooling or heating. The ground source heat pump also utilizes the huge heat storage and cold storage capacity of the underground soil. In winter, the ground source transfers heat from the underground soil to the building, and in summer, it transfers the underground cold to the building, forming a heating and cooling cycle in one year.

[0003] In the existing solar-thermal + seasonal heat storage heating method, the ground source heat pump soil heat storage technology adopted, especially for vertical buried pipes, only studies the buried pipe materials, dimensions, buried pipe depths, spacings, shapes, sizes, etc., and does not discuss and actually use the specific ground buried pipe soil and heat exchange layer soil structures. Basically, through the method of drilling wells, PVC pipes are driven into the soil at a predetermined depth. After placing the heat exchange U-shaped buried pipes, the mud formed by the newly drilled wells is backfilled into the PVC buried pipes of the previous well.

[0004] This operation does not consider the heat exchange effect, which is equivalent to adding a heat insulation layer around the buried pipes. In the range of relatively deep vertical depths, it is very easy to cause uneven heat exchange, thus forming a temperature fault in the bottom layer, affecting the heat storage and heat extraction heat exchange effects of the overall system, resulting in a decline in system efficiency and low soil utilization rate.

[0005] Secondly, the ground source heat pump has a certain relationship with seasons. It can utilize the ground source heat in winter, but long-term use will cause the loss of ground source heat, resulting in the inability to extract heat from the ground source in the later stage. Content of the Utility Model

[0006] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a ground source heat pump soil structure and a solar-thermal complementary system with the ground source heat pump, and solve the above problems by changing the original structure.

[0007] In order to solve the above problems existing in the prior art, the technical solution adopted by the utility model is as follows:

[0008] A ground source heat pump soil structure includes a ground buried pipe. The ground buried pipe includes a pipe well, and a U-shaped heat exchange medium flow channel is arranged inside the pipe well. An aqueous dense lime layer is arranged between the pipe well and the U-shaped heat exchange medium flow channel.

[0009] An external ground heat exchanger is provided with a covering top layer and a gradient ground source heat storage structure, and the covering top layer is arranged on the upper side of the gradient ground source heat storage structure;

[0010] The gradient ground source heat storage structure successively includes a dense sand layer soil doping layer, a dense rock layer soil doping layer and a native soil layer from inside to outside.

[0011] By arranging a gradient ground source heat storage structure outside the ground heat exchanger, a heat exchange gradient is formed to maximize the heat exchange and heat storage effects.

[0012] By changing the original soil structure, unifying the material and density as a whole, the heat exchange uniformity rate is improved in the horizontal and vertical directions, so that the heat field in the entire heat storage system is balanced.

[0013] Further, the covering top layer successively includes a geotextile filter cloth, a first graded sand layer, an insulating layer and a second graded sand layer from top to bottom. The particle size of the first graded sand layer increases from top to bottom, the density decreases, the particle size ranges from 0.3 mm to 15 mm, the overall thickness is 20 - 200 mm, preferably 120 mm, and a native soil surface layer is arranged on the upper side of the geotextile filter cloth. The thickness of the native soil surface layer is 1 - 3 meters, preferably 1.5 meters.

[0014] Further, the thickness of the insulating layer is 20 - 200 mm, preferably 120 mm. The particle size of the second graded sand layer decreases from top to bottom, the density increases, the particle size ranges from 0.3 mm to 15 mm, the overall thickness is 20 - 200 mm, preferably 120 mm. The top end of the ground heat exchanger is in the second graded sand layer, and both ends penetrate through the native soil surface layer.

[0015] A solar-thermal complementary system with the ground source heat pump soil structure includes a ground source heat pump, a solar-thermal direct current flexible system and a heating pipeline;

[0016] The heating pipeline includes a circulation pipeline and a buffer medium tank, the circulation pipeline is communicated with the buffer medium tank, and the circulation pipeline is connected with a heat dissipation end;

[0017] The solar-thermal direct current flexible system includes a solar thermal panel, a water tank, a return water pipe and a makeup water pipe, and the water tank is communicated with the buffer medium tank through the return water pipe and the makeup water pipe;

[0018] The ground source heat pump is communicated with the buffer medium tank through an upper and lower pipeline, and a switching valve is connected to the upper and lower pipeline.

[0019] The solar thermal panel absorbs heat to heat the medium in the water tank, and then the medium in the water tank transfers the heat to the buffer medium tank.

[0020] Further, the heating pipeline further includes a direct-current circulation pump and an expansion tank, both of which are connected to the circulation pipeline. In winter, heat is absorbed from the ground source through the ground-source heat pump for heating. In summer, heat is absorbed through the solar-thermal direct-current flexible system, and then the heat is replenished underground through the ground-source heat pump, enabling the long-term use of the ground-source heat pump.

[0021] Advantages of the present utility model:

[0022] 1. Through the layer-by-layer heat exchange structure, the present utility model forms a buffer heat exchange layer with uniform heat exchange performance between the soil and the U-shaped pipe, so that the heat exchange effect reaches equilibrium at the same horizontal level.

[0023] 2. By unifying the heat exchange material and structure, the present utility model fills a unified material layer in the vertical direction of the overall pipeline depth, achieving consistent heat exchange effects in the overall depth direction.

[0024] 3. The present utility model adopts the upper-layer structure and the structure around the buried pipe, designs the heat field distribution structure of the buried pipe according to the heat transfer effects of different soils, so as to form a stable equilibrium heat field with a spherical-like shape in the whole heat storage heat field, where the central temperature is high and the surrounding temperature is low.

[0025] 4. The present utility model combines the ground-source heat pump with solar-thermal technology. The technology of combining solar-thermal energy with the ground-source heat pump, based on the complementary principle of two renewable energy sources, realizes the development of green energy. Description of the drawings

[0026] Figure 1 It is a schematic structural diagram of Embodiment 1 in the present utility model.

[0027] Figure 2 It is a schematic structural diagram of Embodiment 2 of the present utility model.

[0028] Figure 3 It is a schematic structural diagram of the present utility model.

[0029] In the figure: 1 - buried pipe; 11 - pipe well; 12 - U-shaped heat exchange medium flow channel; 2 - gradually changing ground-source heat storage structure; 21 - water-containing dense lime layer; 22 - dense sand layer soil doping layer; 23 - dense rock layer soil doping layer; 24 - original soil layer; 3 - covering top layer; 31 - original soil surface layer; 32 - geotextile filter cloth; 33 - first graded sand layer; 34 - insulating layer; 35 - second graded sand layer; 36 - drilled original soil layer; 5 - solar-thermal direct-current flexible system; 51 - solar-thermal panel; 52 - return water pipe; 53 - make-up water pipe; 6 - heating pipeline; 61 - direct-current circulation pump; 62 - expansion tank; 63 - buffer medium tank; 64 - circulation pipeline; 65 - upper and lower pipelines; 7 - heat dissipation end; 8 - on-off valve. Detailed implementation manners

[0030] The present utility model will be further described below in conjunction with the accompanying drawings and reference numerals.

[0031] In order to more clearly understand the above objects, features, and advantages of the present utility model, the present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0032] The terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present utility model, it should also be noted that, unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] The following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present utility model and are not used to limit the present utility model.

[0035] Embodiment 1:

[0036] As Figure 1 and 2 shown, a ground source heat pump soil structure includes a buried pipe 1. The buried pipe 1 includes a pipe well 11, and a U-shaped heat exchange medium flow channel 12 is provided inside the pipe well 11. A water-containing dense lime layer 21 is provided between the pipe well 11 and the U-shaped heat exchange medium flow channel 12;

[0037] A covering top layer 3 and a gradient ground source heat storage structure 2 are provided outside the buried pipe 1, and the covering top layer 3 is arranged on the upper side of the gradient ground source heat storage structure;

[0038] The gradient ground source heat storage structure 2 sequentially includes a dense sand layer soil doping layer 22, a dense rock layer soil doping layer 23, and an original soil layer 24 from inside to outside.

[0039] By arranging the gradient ground source heat storage structure 2 outside the buried pipe 1, a heat exchange gradient is formed, and the heat exchange and heat storage effects are maximally increased.

[0040] By changing the original soil structure, the materials and densities are unified as a whole, and the heat exchange uniformity is improved in the horizontal and vertical directions, so that the heat field in the entire heat storage system is balanced.

[0041] Example 2:

[0042] On the basis of Example 1, the covering top layer 3 sequentially includes a geotextile filter cloth 32 (the thickness of the geotextile filter cloth 32 is 3 - 10 mm, preferably 5 mm), a first graded sand layer 33, an insulating layer 34, and a second graded sand layer 35 from top to bottom.

[0043] For the first graded sand layer 33, the particle size increases from top to bottom, the density decreases, the particle size ranges from 0.3 mm to 15 mm, and the overall thickness is 20 - 200 mm, preferably 120 mm.

[0044] The original soil surface layer 31 is provided on the upper side of the geotextile filter cloth 32. The thickness of the original soil surface layer 3 - 1 is 1 - 3 meters, preferably 1.5 meters.

[0045] Example 3:

[0046] On the basis of Example 2, the thickness of the insulating layer 34 is 20 - 200 mm, preferably 120 mm.

[0047] For the second graded sand layer 35, the particle size decreases from top to bottom, the density increases, the particle size ranges from 0.3 mm to 15 mm, and the overall thickness is 20 - 200 mm, preferably 120 mm.

[0048] The top end of the buried pipe 1 is within the second graded sand layer 35, and both ends penetrate through the original soil surface layer.

[0049] The water content of the water-containing dense lime is 2% - 30%, preferably 20%.

[0050] The content of the doped soil in the dense sand layer soil is 15% - 35%, preferably 25%.

[0051] The content of the doped soil in the dense rock layer soil is 15% - 35%, preferably 25%.

[0052] The material of the U-shaped heat exchange medium channel is PU, the pipe diameter is 10 - 40 mm, preferably 25 mm.

[0053] The material of the pipe well 11 is PVC, the pipe diameter is 80 - 200 mm, preferably 150 mm.

[0054] In the gradually changing ground source heat storage structure 2, from the inside to the outside, the water content and the heat exchange effect decrease in turn, controlling a larger temperature gradient, increasing the heat exchange effect, and increasing the heat storage performance.

[0055] In the covering top layer 3, the thickness of the original soil surface layer 31 being more than 1 meter does not affect land use. The geotextile filter cloth 32 prevents infiltration between the upper and lower layers. The first graded sand layer 33 and the second graded sand layer 35 play a solidifying effect, increasing the soil hardness structure. The insulating layer 34 plays a role in protecting against water infiltration and preventing heat conduction, etc. The drilled original soil layer 36 (gradually changing ground source heat storage structure 2) does not damage the original soil structure, etc.

[0056] Example 4:

[0057] As Figure 3 shown, a solar-thermal complementary system with a ground-source heat pump includes a ground-source heat pump, a solar-thermal direct-current flexible system 5, and a heating pipeline 6;

[0058] The heating pipeline 6 includes a circulation pipeline 64 and a buffer medium tank 63. The circulation pipeline 64 is communicated with the buffer medium tank 63, and the circulation pipeline 64 is connected with a heat dissipation end 7;

[0059] The solar-thermal direct-current flexible system 5 includes a solar thermal panel 51, a water tank, a return water pipe 52, and a make-up water pipe 53. The water tank is communicated with the buffer medium tank 63 through the return water pipe 52 and the make-up water pipe 53; (The solar-thermal direct-current flexible system 5 is an existing technology and is directly used here).

[0060] The ground-source heat pump is communicated with the buffer medium tank 63 through an upper and lower pipeline 65, and a switching valve 8 is connected to the upper and lower pipeline 65.

[0061] The solar thermal panel 51 absorbs heat to heat the medium in the water tank, and then the medium in the water tank transfers the heat to the buffer medium tank 63.

[0062] The heating pipeline 6 further includes a direct-current circulation pump 61 and an expansion tank 62, and both the direct-current circulation pump 61 and the expansion tank 62 are communicated with the circulation pipeline 64.

[0063] In winter, heat is extracted from the ground source through the ground-source heat pump for heating. In summer, heat is absorbed through the solar-thermal direct-current flexible system 5, and then the heat is replenished back to the ground through the ground-source heat pump, so that the ground-source heat pump can be used for a long time.

[0064] By setting the ground-source heat pump and the heating pipeline, the ground-source heat pump can provide heat for heating in winter. However, after several years of using the ground-source heat, the heat will be insufficient later. Therefore, the heat absorbed by the solar energy in summer is used to supplement the ground-source heat, so that the ground-source heat can be used for a long time.

[0065] The present utility model is not limited to the above optional embodiments. Anyone can obtain other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present utility model, they all fall within the protection scope of the present utility model.

Claims

1. A ground source heat pump soil structure, characterized in that: It includes a buried pipe (1), the buried pipe (1) includes a pipe well (11), a U-shaped heat exchange medium flow channel (12) is arranged inside the pipe well (11), and a water-containing dense lime layer (21) is arranged between the pipe well (11) and the U-shaped heat exchange medium flow channel (12); A covering top layer (3) and a gradient ground source heat storage structure (2) are arranged outside the buried pipe (1), and the covering top layer (3) is arranged on the upper side of the gradient ground source heat storage structure (2); The gradient ground source heat storage structure (2) sequentially includes a dense sand layer soil doping layer (22), a dense rock layer soil doping layer (23), and a natural soil layer (24) from inside to outside.

2. The ground source heat pump soil structure according to claim 1, characterized in that: The covering top layer (3) sequentially includes a geotextile filter cloth (32), a first graded sand layer (33), an insulating layer (34), and a second graded sand layer (35) from top to bottom.

3. The ground source heat pump soil structure according to claim 2, wherein: A natural soil surface layer (31) is arranged on the upper side of the geotextile filter cloth (32).

4. A hybrid solar-thermal system with a ground source heat pump soil structure as described in any one of claims 1-3, characterized in that: It includes a ground source heat pump, a solar thermal direct current flexibility system (5), and a heating pipeline (6); The heating pipeline (6) includes a circulation pipeline (64) and a buffer medium tank (63), the circulation pipeline (64) is communicated with the buffer medium tank (63), and the circulation pipeline (64) is connected with a heat dissipation end (7); The solar thermal direct current flexibility system (5) includes a solar thermal panel (51), a water tank, a return water pipe (52), and a makeup water pipe (53), and the water tank is communicated with the buffer medium tank (63) through the return water pipe (52) and the makeup water pipe (53); The ground source heat pump is communicated with the buffer medium tank (63) through an up-and-down pipeline (65), and a switching valve (8) is connected to the up-and-down pipeline (65).

5. The solar-thermal complementary system according to claim 4, wherein: The heating pipeline (6) further includes a direct current circulation pump (61) and an expansion tank (62), and both the direct current circulation pump (61) and the expansion tank (62) are communicated with the circulation pipeline (64).

Images