CN113899227A - Pile foundation embedded heat exchange tube and energy pile - Google Patents

Pile foundation embedded heat exchange tube and energy pile Download PDF

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Publication number
CN113899227A
CN113899227A CN202111310202.2A CN202111310202A CN113899227A CN 113899227 A CN113899227 A CN 113899227A CN 202111310202 A CN202111310202 A CN 202111310202A CN 113899227 A CN113899227 A CN 113899227A
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CN
China
Prior art keywords
heat exchange
tube
exchange tube
pile foundation
section
Prior art date
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Pending
Application number
CN202111310202.2A
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Chinese (zh)
Inventor
阚玉红
格日勒
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Beijing Jingcheng Huayu Architecture Design And Research Institute Co ltd
MCC Capital Engineering and Research Incorporation Ltd
Original Assignee
Beijing Jingcheng Huayu Architecture Design And Research Institute Co ltd
MCC Capital Engineering and Research Incorporation Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Jingcheng Huayu Architecture Design And Research Institute Co ltd, MCC Capital Engineering and Research Incorporation Ltd filed Critical Beijing Jingcheng Huayu Architecture Design And Research Institute Co ltd
Priority to CN202111310202.2A priority Critical patent/CN113899227A/en
Publication of CN113899227A publication Critical patent/CN113899227A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/10—Deep foundations
    • E02D27/12—Pile foundations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
    • F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
    • F24T10/15—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using bent tubes; using tubes assembled with connectors or with return headers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy

Abstract

The invention provides a pile foundation embedded heat exchange tube and an energy pile, and relates to a ground source heat pump system. The pile foundation embedded heat exchange tube and the energy pile can effectively improve the heat exchange efficiency of the energy pile.

Description

Pile foundation embedded heat exchange tube and energy pile
Technical Field
The invention relates to a ground source heat pump system, in particular to a pile foundation embedded heat exchange tube and an energy pile.
Background
The ground source heat pump system can realize energy storage and extraction through seasonal heat storage. In one aspect, the heat pump system may store heat generated in the building in the formation through a heat exchange system in a heat exchange well; on the other hand, the heat pump system can also extract heat from the stratum through a heat exchange system in the heat exchange well, so that heat supply of a building is realized. The energy pile heat storage technology is characterized in that a concrete pile foundation buried underground is used as a part of a heat storage and exchange ground source heat pump system, a heat exchange pipe is buried in a foundation pile, and the foundation pile is used as a heat exchange well, so that well digging construction links in the ground source heat pump system are reduced.
The existing pile foundation buried pipe heat exchanger comprises a single U-shaped pipe, a double U-shaped pipe, a W-shaped pipe and a single spiral pipe. Compared with a single U-shaped pipe, the double U-shaped pipe, the W-shaped pipe and the single spiral pipe increase the heat transfer area to different degrees, particularly the single spiral pipe, but the straight line form of the outflow section of the double U-shaped pipe, the W-shaped pipe and the single spiral pipe does not fully increase the heat transfer area, and the influence on the heat exchange efficiency of the energy pile is limited.
Meanwhile, the conventional pile foundation buried pipe is generally made of a PE plastic pipe, the compressive strength and compressive strength of the PE plastic pipe are low, the service life of the energy pile is influenced, and the heat conductivity coefficient is small (lambda is 0.42(w/m · k)), so that the heat exchange between the fluid in the pipe and the pile body outside the pipe is insufficient.
In view of the above, the inventor designs a pile foundation embedded heat exchange tube and an energy pile through repeated experiments according to production design experiences in the field and related fields for many years, so as to solve the problems in the prior art.
Disclosure of Invention
The invention aims to provide a pile foundation embedded heat exchange tube and an energy pile, which can effectively improve the heat exchange efficiency of the energy pile.
In order to achieve the above purpose, the present invention provides a pile foundation embedded heat exchange tube, wherein the pile foundation embedded heat exchange tube has a downstream tube, a connecting tube and an upstream tube, which are sequentially connected, the connecting tube is an arc-bent tube, the upstream tube and the downstream tube are arranged in parallel and symmetrically connected to two ends of the connecting tube, the downstream tube includes a downstream heat-insulating tube section and a downstream heat-exchanging tube section, the downstream heat-exchanging tube section is connected to the connecting tube, the upstream tube includes an upstream heat-insulating tube section and an upstream heat-exchanging tube section, the upstream heat-exchanging tube section is connected to the connecting tube, the upstream heat-exchanging tube section and the downstream heat-exchanging tube section are respectively in a spiral tube shape, and the upstream heat-insulating tube section and the downstream heat-insulating tube section are respectively in a straight tube shape.
The pile foundation embedded heat exchange tube is characterized in that the lower heat exchange tube section and the upper heat exchange tube section are arranged in an equidistant double-helix manner.
The pile foundation embedded heat exchange tube is characterized in that the lower heat exchange tube section and the upper heat exchange tube section are arranged in a variable-pitch double-helix manner.
The pile foundation embedded heat exchange tube is characterized in that the lower heat exchange tube section and the upper heat exchange tube section are respectively arranged in a single spiral shape.
The pile foundation embedded heat exchange tube comprises a pipe wall of the downward heat insulation pipe section and a pipe wall of the upward heat insulation pipe section, wherein the pipe wall of the downward heat insulation pipe section and the pipe wall of the upward heat insulation pipe section comprise a steel pipe layer, a foam plastic layer and a plastic protective layer which are sequentially arranged from inside to outside.
The pile foundation embedded heat exchange tube is characterized in that the upper heat exchange tube section and the lower heat exchange tube section are respectively made of copper-aluminum alloy tubes.
The invention further provides an energy pile, wherein the energy pile comprises a pile foundation and at least one pile foundation embedded heat exchange tube, the pile foundation embedded heat exchange tube is embedded in the pile foundation, and the downward heat insulation tube section and the upward heat insulation tube section penetrate through the top surface of the pile foundation upwards.
The energy pile as described above, wherein two heat exchange pipes are embedded in the energy pile.
The energy stake as described above, wherein two said downstream heat exchange tube segments and two said upstream heat exchange tube segments are arranged in a four-line spiral.
The energy pile as described above, wherein the distance between the bottom end of the downward heat-insulating pipe section and the bottom end of the upward heat-insulating pipe section from the top end face of the energy pile is 0.5 m.
Compared with the prior art, the pile foundation embedded heat exchange tube and the energy pile provided by the invention have the following characteristics and advantages:
according to the pile foundation embedded heat exchange tube and the energy pile provided by the invention, the heat-conducting fluid flowing out of the ground source heat pump flows in through the downlink tube and flows out through the uplink tube, the heat-conducting fluid exchanges heat with the pile foundation in the downlink heat exchange tube section and the uplink heat exchange tube section, and the heat transfer area between the heat-conducting fluid and the pile foundation is increased because the downlink heat exchange tube section and the uplink heat exchange tube section are both in a spiral tube shape, so that the heat exchange between the heat-conducting fluid and the pile foundation is more sufficient, and the heat exchange efficiency of the energy pile is improved.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case.
Fig. 1 is a schematic structural diagram of an embodiment of a pile foundation embedded heat exchange tube provided by the invention;
fig. 2 is a schematic structural diagram of another embodiment of the pile foundation embedded heat exchange tube provided by the invention;
fig. 3 is a schematic structural view of a pile foundation embedded heat exchange tube according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of an embodiment of the energy pile according to the present invention;
fig. 5 is a schematic structural diagram of another embodiment of the energy pile according to the present invention.
Description of reference numerals:
100. embedding heat exchange tubes in a pile foundation; 10. A down pipe;
11. a descending heat preservation pipe section; 12. A downstream heat exchange tube section;
20. a connecting pipe; 30. An ascending pipe;
31. an ascending heat-insulating pipe section; 32. An upstream heat exchange tube section;
200. an energy pile; 210. A pile foundation;
300. a ground source heat pump; 400. A circulation pump;
500. a pipeline; 600. And (3) soil.
Detailed Description
The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may be present.
As shown in fig. 1 to 5, the present invention provides a pile foundation embedded heat exchange tube 100, the pile foundation embedded heat exchange tube 100 has a down tube 10, a connection tube 20 and an up tube 30 which are sequentially connected, the connection tube 20 is an arc-bent tube, the up tube 30 and the down tube 10 are arranged in parallel and symmetrically connected to two ends of the connection tube 20, the down tube 10 includes a down heat-preservation tube section 11 and a down heat-exchange tube section 12, the down heat-exchange tube section 12 is connected to the connection tube 20, the up tube 30 includes an up heat-preservation tube section 31 and an up heat-exchange tube section 32, the up heat-exchange tube section 32 is connected to the connection tube 20, the up heat-exchange tube section 32 and the down heat-exchange tube section 12 are respectively in a spiral tube shape, and the up heat-preservation tube section 31 and the down heat-preservation tube section 11 are respectively in a straight tube shape.
The invention also provides an energy pile 200, wherein the energy pile 200 comprises a pile foundation 210 and the pile foundation embedded heat exchange pipe 100, the pile foundation embedded heat exchange pipe 100 is embedded in the pile foundation 210, and the descending heat preservation pipe section 11 and the ascending heat preservation pipe section 31 upwards penetrate through the top surface of the pile foundation 210.
According to the pile foundation embedded heat exchange tube 100 and the energy pile 200 provided by the invention, the heat transfer fluid flowing out of the ground source heat pump flows in through the downlink tube 10 and flows out through the uplink tube 30, the heat transfer fluid exchanges heat with the pile foundation 210 in the downlink heat exchange tube section 12 and the uplink heat exchange tube section 32, and the heat transfer area between the heat transfer fluid and the pile foundation 210 is increased because the downlink heat exchange tube section 12 and the uplink heat exchange tube section 32 are both in a spiral tube shape, so that the heat exchange between the heat transfer fluid and the pile foundation 210 is more sufficient, and the heat exchange efficiency of the energy pile 200 is improved.
According to the pile foundation embedded heat exchange tube 100 and the energy pile 200, the temperature of the down tube 10 and the temperature of the up tube 30 are always kept at a certain temperature difference with the pile foundation 210 for a long time, so that the pile foundation embedded heat exchange tube 100 and the pile foundation 210 fully exchange heat, and the heat exchange efficiency of the energy pile 200 is improved.
According to the pile foundation embedded heat exchange tube 100 and the energy pile 200, the heat transfer area of the pile foundation embedded heat exchange tube 100 can be changed by changing the spiral structures and the thread pitches of the lower heat exchange tube section 12 and the upper heat exchange tube section 32, and therefore the heat exchange efficiency of the energy pile 200 is improved.
In an alternative embodiment of the present invention, the downstream heat exchange tube section 12 and the upstream heat exchange tube section 32 may be right-handed spirals or left-handed spirals.
In an alternative embodiment of the present invention, as shown in FIG. 1, the downstream heat exchange tube section 12 and the upstream heat exchange tube section 32 are arranged in an equidistant double helix.
In an alternative example of this embodiment, a pile foundation embedded heat exchange pipe 100 is embedded in the pile foundation 210.
In another alternative example of this embodiment, as shown in fig. 4, two pile foundation embedded heat exchange pipes 100 are embedded in the pile foundation 210.
In another alternative embodiment of the present invention, as shown in FIG. 2, the downstream heat exchange tube section 12 and the upstream heat exchange tube section 32 are arranged in a variable pitch, double helix arrangement. The parts of the downward heat exchange pipe section 12 and the upward heat exchange pipe section 32, which are positioned at the upper part of the pile foundation 210, have larger screw pitches, and the parts of the downward heat exchange pipe section 12 and the upward heat exchange pipe section 32, which are positioned at the middle lower part of the pile foundation 210, have smaller screw pitches, so that the characteristic that the lower part of the pile foundation embedded heat exchange pipe 100 is more beneficial to fully diffusing energy into soil is fully considered, the screw pitches of threads at the middle lower part are relatively reduced, and the heat transfer area is increased. The specific data of the thread pitch can be adjusted by the technicians in the field according to the actual conditions of the construction site.
In an alternative example of this embodiment, a pile foundation embedded heat exchange pipe 100 is embedded in the pile foundation 210.
In another alternative example of this embodiment, two pile foundation embedded heat exchange pipes 100 are embedded in the pile foundation 210.
In yet another alternative embodiment of the present invention, as shown in fig. 3, the downstream heat exchange tube section 12 and the upstream heat exchange tube section 32 are respectively arranged in a single spiral shape, that is, both the downstream heat exchange tube section 12 and the upstream heat exchange tube section 32 are in a single spiral shape, and the two single spirals are connected in series through the connecting pipe 20. The downstream heat exchange tube section 12 and the upstream heat exchange tube section 32 can be respectively a right-handed screw, a left-handed screw, and a right-handed screw; meanwhile, the downstream heat exchange tube section 12 and the upstream heat exchange tube section 32 may be equidistant spirals or variable pitch spirals.
In an alternative example of this embodiment, a pile foundation embedded heat exchange pipe 100 is embedded in the pile foundation 210.
In another alternative example of this embodiment, two pile foundation embedded heat exchange pipes 100 are embedded in the pile foundation 210.
In yet another alternative embodiment of the present invention, as shown in fig. 5, two pile foundation embedded heat exchange tubes 100 are embedded in the pile foundation 210, and two lower heat exchange tube sections 12 and two upper heat exchange tube sections 32 of the two pile foundation embedded heat exchange tubes 100 are arranged in a four-line spiral shape.
In the present invention, three pile foundation embedded heat exchange tubes 100 or more pile foundation embedded heat exchange tubes 100 may also be provided in the pile foundation 210, and a person skilled in the art may determine the number of the pile foundation embedded heat exchange tubes 100 in the pile foundation 210 according to actual needs.
In an alternative embodiment of the invention, the bottom end of the descending insulated pipe section 11 and the bottom end of the ascending insulated pipe section 31 are spaced 0.5m from the top end face of the energy pile 200.
In an alternative embodiment of the present invention, the pipe wall of the downward heat-insulating pipe segment 11 and the pipe wall of the upward heat-insulating pipe segment 31 include a steel pipe layer, a foamed plastic layer, and a plastic protective layer, which are sequentially disposed from inside to outside, so that energy loss caused by the heat exchange fluid flowing through the upper portion of the pile foundation is reduced.
In an alternative example of this embodiment, the foam layer is a rigid polyurethane foam layer and the plastic protective layer is a high density polyethylene protective layer.
Preferably, the steel-protecting pipe layer is seamless steel pipe GB/8163, the foam plastic layer is made of rigid polyurethane foam plastic with the thickness of 50mm, the plastic protective layer is made of high-density polyethylene outer protective pipe, the descending heat-insulating pipe section 11 and the ascending heat-insulating pipe section 31 are integrally prefabricated in a factory, and the performance of the prefabricated direct-buried heat-insulating pipe and pipe fitting made of rigid polyurethane foam plastic meets the industrial standard GB/T29047-2012.
In an alternative embodiment of the present invention, the upstream heat exchange tube segment 32 and the downstream heat exchange tube segment 12 are each made of a copper aluminum alloy tube, and have a high thermal conductivity ((4.5% Cu) ═ 163(w/m · k)), and a high compressive and compressive strength. The copper-aluminum alloy tube enhances the heat exchange efficiency, so that the heat exchange fluid can be fully stored in the ground.
In an optional embodiment of the present invention, the downward heat-insulating pipe segment 11 and the upward heat-insulating pipe segment 31 extend out of the pile foundation 210 and are respectively connected to the soil source heat pump 300 through a pipeline 500, the heat transfer pipeline is further provided with a circulation pump 400, a heat transfer fluid flowing out from the soil source heat pump is pumped into the pile foundation embedded heat exchange pipe 100 through the circulation pump and the pipeline, the heat transfer fluid exchanges heat with the pile foundation in the pile foundation embedded heat exchange pipe 100 and then flows back to the circulation pump through the pipeline, the pile foundation 210 is a concrete pile foundation and is embedded in the soil 600, and the pile foundation 210 receives heat of the pile foundation embedded heat exchange pipe 100 and then serves as a part of the heat storage and exchange ground source heat pump system.
In the invention, the connection of each pipeline adopts welding. Before welding, sundries in the pipeline must be removed completely, and welding and inspection are carried out according to the regulations and requirements of the urban heat supply pipe network engineering construction and acceptance standard (CJJ28-2014) strictly, so that the welding quality is ensured.
The present invention is not limited to the above embodiments, and in particular, various features described in different embodiments can be arbitrarily combined with each other to form other embodiments, and the features are understood to be applicable to any embodiment except the explicitly opposite descriptions, and are not limited to the described embodiments.

Claims (10)

1. The pile foundation embedded heat exchange tube is characterized by comprising a downstream tube, a connecting tube and an upstream tube which are sequentially connected, wherein the connecting tube is an arc-shaped bent tube, the upstream tube and the downstream tube are arranged in parallel and symmetrically connected to two ends of the connecting tube, the downstream tube comprises a downstream heat insulation tube section and a downstream heat exchange tube section, the downstream heat exchange tube section is connected with the connecting tube, the upstream tube comprises an upstream heat insulation tube section and an upstream heat exchange tube section, the upstream heat exchange tube section is connected with the connecting tube, the upstream heat exchange tube section and the downstream heat exchange tube section are respectively in a spiral tube shape, and the upstream heat insulation tube section and the downstream heat insulation tube section are respectively in a straight tube shape.
2. The pile foundation embedded heat exchange tube of claim 1, wherein the downward heat exchange tube section and the upward heat exchange tube section are arranged in an equidistant double helix.
3. The pile foundation embedded heat exchange tube of claim 1, wherein the downward heat exchange tube section and the upward heat exchange tube section are arranged in a variable pitch double helix.
4. The pile foundation embedded heat exchange tube of claim 1, wherein the downward heat exchange tube section and the upward heat exchange tube section are respectively arranged in a single spiral shape.
5. The pile foundation embedded heat exchange tube of claim 1, wherein the tube wall of the downward heat preservation tube section and the tube wall of the upward heat preservation tube section comprise a steel tube layer, a foam plastic layer and a plastic protection layer which are sequentially arranged from inside to outside.
6. The pile foundation embedded heat exchange tube of claim 1, wherein the up heat exchange tube section and the down heat exchange tube section are made of copper aluminum alloy tubes, respectively.
7. An energy pile, characterized in that, the energy pile includes pile foundation and at least one as in claim 1 the pre-buried heat exchange tube of pile foundation, the pre-buried heat exchange tube of pile foundation is pre-buried in the pile foundation, down heat preservation pipeline section with go upward heat preservation pipeline section upwards run through to the top surface of pile foundation.
8. The energy pile of claim 7, wherein two of said heat exchange tubes are pre-embedded in said energy pile.
9. The energy stake of claim 8, wherein two of said downstream heat exchange tube segments and two of said upstream heat exchange tube segments are arranged in a four-line spiral.
10. The energy pile of claim 7, wherein the bottom end of said descending insulating pipe section and the bottom end of said ascending insulating pipe section are spaced from the top end surface of said energy pile by a distance of 0.5 m.
CN202111310202.2A 2021-11-04 2021-11-04 Pile foundation embedded heat exchange tube and energy pile Pending CN113899227A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111310202.2A CN113899227A (en) 2021-11-04 2021-11-04 Pile foundation embedded heat exchange tube and energy pile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111310202.2A CN113899227A (en) 2021-11-04 2021-11-04 Pile foundation embedded heat exchange tube and energy pile

Publications (1)

Publication Number Publication Date
CN113899227A true CN113899227A (en) 2022-01-07

Family

ID=79193569

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111310202.2A Pending CN113899227A (en) 2021-11-04 2021-11-04 Pile foundation embedded heat exchange tube and energy pile

Country Status (1)

Country Link
CN (1) CN113899227A (en)

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