CN109405616B - Phase-change energy-storage sleeve type geothermal heat exchanger - Google Patents
Phase-change energy-storage sleeve type geothermal heat exchanger Download PDFInfo
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- CN109405616B CN109405616B CN201811292145.8A CN201811292145A CN109405616B CN 109405616 B CN109405616 B CN 109405616B CN 201811292145 A CN201811292145 A CN 201811292145A CN 109405616 B CN109405616 B CN 109405616B
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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
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
- F28D20/026—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat with different heat storage materials not coming into direct contact
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- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Abstract
The utility model provides a phase transition energy storage bushing type geothermal heat exchanger, belongs to ground source heat pump air conditioner technical field, comprises center tube, first sleeve pipe, second sleeve pipe, third sleeve pipe, first annular channel, second annular channel, top apron, bottom apron, summer and winter operating mode phase change material, inlet tube and outlet pipe. The first sleeve, the second sleeve and the third sleeve are respectively arranged on the outer side of the central pipe along the radius increasing direction by taking the central pipe as a circle center. The phase-change materials under the summer working condition and the winter working condition are respectively packaged in the central pipe and an annular closed space formed by the second sleeve and the third sleeve. The invention solves the defects of large soil temperature fluctuation, long heat affected zone and large heat short circuit of the water inlet and outlet pipes in the operation of the existing geothermal heat exchanger, and can weaken the heat short circuit of the water inlet and outlet pipes, relieve the heat affected degree of the soil temperature, reduce the heat interference radius and shorten the pipe embedding area and increase the heat exchange quantity of the geothermal heat exchanger by the phase change heat absorption and heat release of the phase change material, thereby improving the heat exchange efficiency.
Description
Technical Field
The invention belongs to the technical field of ground source heat pump air conditioner utilization, relates to a phase change energy storage sleeve type geothermal heat exchanger, and particularly relates to a phase change energy storage sleeve type geothermal heat exchanger which encapsulates two phase change materials with different melting point temperature ranges in a sleeve.
Background
The ground source heat pump is regarded as one of the most potential heating and air conditioning technologies at present as an energy-saving and environment-friendly renewable energy utilization technology. The geothermal heat exchanger is used as the only device for the ground source heat pump to exchange heat with the soil, and the energy storage and heat transfer performance and the resulting thermal response characteristic to the ambient soil temperature of the geothermal heat exchanger are important for the long-term efficient and stable operation of the ground source heat pump system. The heat transfer between the geothermal heat exchanger and the surrounding soil is unsteady, and as the unit operates, the heat is continuously stored in the ground or taken out from the ground and released, and the longer the continuous operation time is, the larger the amplitude of the change of the soil temperature is, which will affect the efficiency of the unit.
At present, when a traditional geothermal heat exchanger works, the temperature of surrounding soil is continuously increased or reduced due to the thermal response of the geothermal heat exchanger, the energy storage performance of the ground heat exchanger begins to be attenuated, and an obvious underground slip trend appears obviously, so that the temperature of circulating water in the heat exchanger correspondingly changes, and the operation condition of a heat pump unit is directly deteriorated; meanwhile, the traditional geothermal heat exchanger is easy to generate thermal short circuit due to the fact that the temperature difference of fluid of the inlet branch pipe and the outlet branch pipe is large, and therefore the heat exchange efficiency is further reduced; in addition, the traditional geothermal heat exchanger has large heat influence radius and large occupied area of buried pipes during working, and the popularization and the application of a ground source heat pump are limited to a certain extent for cities with tense land. Therefore, it is necessary to provide a geothermal heat exchanger, which can reduce the thermal short circuit of the inlet and outlet pipelines, enhance the energy storage and heat transfer performance thereof, and reduce the influence degree of the inlet and outlet pipelines on the ambient soil temperature, shorten the heat influence radius and save the buried pipe area by changing the thermal response characteristics thereof.
Disclosure of Invention
The invention aims to provide a phase-change energy-storage sleeve type geothermal heat exchanger aiming at the defects of large heat-affected radius, large occupied area, serious heat short circuit of an inlet pipeline and an outlet pipeline and low heat exchange efficiency of the traditional geothermal heat exchanger, so that the phase-change energy-storage sleeve type geothermal heat exchanger can reduce the heat short circuit of the inlet pipeline and the outlet pipeline, shorten the heat-affected radius, save the occupied area and improve the energy-storage and heat-transfer performances of the phase-change energy-storage sleeve type geothermal heat exchanger.
The technical scheme of the invention is as follows: a phase change energy storage bushing type geothermal heat exchanger which characterized in that: the geothermal heat exchanger consists of a central pipe, a first sleeve, a second sleeve, a third sleeve, a first annular channel, a second annular channel, a top cover plate, a bottom cover plate, a summer working condition phase change material, a winter working condition phase change material, a water inlet pipe and a water outlet pipe; the central tube is arranged in the center of the geothermal heat exchanger, and the first sleeve, the second sleeve and the third sleeve are sequentially sleeved outside the central tube along the radius increasing direction by taking the center of the central tube as the center of a circle; the first annular channel is formed by a space enclosed by the central pipe and the first sleeve; the second annular channel is formed by a space enclosed by the second sleeve and the third sleeve; the summer working condition phase-change material is packaged in the central tube; the winter working condition phase-change material is packaged in an annular space formed by the first sleeve and the second sleeve; the top cover plate and the bottom cover plate are respectively in hot melting connection with the top and the bottom of the geothermal heat exchanger; the top cover plate is provided with a first cover plate opening, a second cover plate opening, a third cover plate opening, a fourth cover plate opening, a fifth cover plate opening, a sixth cover plate opening and a connecting plate rib; the joint of the annular closed space formed by the first sleeve and the second sleeve and the bottom cover plate is provided with a first bottom opening, a second bottom opening, a third bottom opening and a fourth bottom opening, the first annular channel is communicated with the second annular channel through the first bottom opening, the second bottom opening, the third bottom opening and the fourth bottom opening, the water inlet pipe is communicated with the first annular channel, and the water outlet pipe is communicated with the second annular channel.
The first opening of the cover plate, the second opening of the cover plate, the third opening of the cover plate and the fourth opening of the cover plate are fan-shaped annular openings, and the fifth opening of the cover plate and the sixth opening of the cover plate are arc-shaped openings; the first opening, the second opening, the third opening and the fourth opening of the cover plate are symmetrically arranged around the circular cover plate; the cover plate fifth opening and the cover plate sixth opening are arranged on the inner sides of the cover plate first opening, the cover plate second opening, the cover plate third opening and the cover plate fourth opening and are symmetrically arranged relative to the connecting plate ribs, and the size of the openings is determined according to the circulation flow of the geothermal heat exchanger.
The first bottom opening, the second bottom opening, the third bottom opening and the fourth bottom opening are symmetrically arranged around the circle center, and the size of the openings is determined according to the circulation flow of the geothermal heat exchanger.
The water inlet pipe is communicated with the first annular channel through a fifth opening of the cover plate and a sixth opening of the cover plate in the top cover plate; the water outlet pipe is communicated with the second annular channel through a first cover plate opening, a second cover plate opening, a third cover plate opening and a fourth cover plate opening in the top cover plate.
The phase-change material under the summer working condition is mixed acid with the melting point temperature ranging from 25 ℃ to 30 ℃, and the phase-change material under the winter working condition is oleic acid with the phase-change temperature ranging from 5 ℃ to 10 ℃.
The invention has the beneficial effects that: the invention provides a phase-change energy-storage sleeve type geothermal heat exchanger which structurally comprises a central pipe, a first sleeve, a second sleeve, a third sleeve, a first annular channel, a second annular channel, a top cover plate, a bottom cover plate, a summer working condition phase-change material, a winter working condition phase-change material, a water inlet pipe and a water outlet pipe, and is novel in structure, the amplitude of the influence of the heat exchange process of the geothermal heat exchanger on the temperature fluctuation of surrounding soil is reduced through the heat absorption and the heat release of the phase-change material, and the heat influence radius is reduced, so that the embedding distance between the geothermal heat exchangers can be shortened, and the occupied area is saved; the heat exchange quantity of the geothermal heat exchanger can be increased through the release of phase change latent heat of the phase change material, so that the heat exchange efficiency of the geothermal heat exchanger can be improved; the double-pipe heat exchanger is adopted to encapsulate the phase change material between the water inlet channel and the water outlet channel, thereby playing a role in heat insulation and preservation, reducing the thermal short circuit between the water inlet channel and the water outlet channel and further improving the heat exchange efficiency.
Drawings
Fig. 1 is a schematic horizontal sectional structure view of the phase change energy storage type geothermal heat exchanger of the present invention.
Fig. 2 is a schematic view of the sectional structure of the phase-change energy-storage geothermal heat exchanger in elevation.
FIG. 3 is a schematic cross-sectional view of the bottom opening of the present invention.
FIG. 4 is a schematic view of the top cover plate opening structure of the present invention.
In the figure: the device comprises a central pipe 1, a first sleeve 2-1, a second sleeve 2-2, a third sleeve 2-3, a first annular channel 3-1, a second annular channel 3-2, a top cover plate 4, a cover plate first opening 4-1, a cover plate second opening 4-2, a cover plate third opening 4-3, a cover plate fourth opening 4-4, a cover plate fifth opening 4-5, a cover plate sixth opening 4-6, connecting plate ribs 4-7, a bottom cover plate 5, a summer working condition phase change material 6, a winter working condition phase change material 7, a water inlet pipe 8, a water outlet pipe 9, a bottom first opening 10-1, a bottom second opening 10-2, a bottom third opening 10-3 and a bottom fourth opening 10-4.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1-4, a phase change energy storage double-pipe geothermal heat exchanger is composed of a central pipe 1, a first sleeve 2-1, a second sleeve 2-2, a third sleeve 2-3, a first annular channel 3-1, a second annular channel 3-2, a top cover plate 4, a bottom cover plate 5, a summer working condition phase change material 6, a winter working condition phase change material 7, a water inlet pipe 8 and a water outlet pipe 9; the central tube 1 is arranged in the center of the geothermal heat exchanger, and the first sleeve 2-1, the second sleeve 2-2 and the third sleeve 2-3 are sequentially sleeved outside the central tube 1 along the radius increasing direction by taking the center of the central tube 1 as the center of a circle; the first annular channel 3-1 is formed by a space enclosed by the central pipe 1 and the first sleeve 2-1; the second annular channel 3-2 is formed by a space enclosed by the second sleeve 2-2 and the third sleeve 2-3; the phase change material 6 is packaged in the central tube 1 under summer working conditions; the winter working condition phase change material 7 is packaged in an annular space surrounded by the first sleeve 2-1 and the second sleeve 2-2; the top cover plate 4 and the bottom cover plate 5 are respectively in hot melting connection with the top and the bottom of the geothermal heat exchanger; a first cover plate opening 4-1, a second cover plate opening 4-2, a third cover plate opening 4-3, a fourth cover plate opening 4-4, a fifth cover plate opening 4-5, a sixth cover plate opening 4-6 and connecting plate ribs 4-7 are arranged on the top cover plate 4; the joint of an annular closed space formed by the first sleeve 2-1 and the second sleeve 2-2 and the bottom cover plate 5 is provided with a bottom first opening 10-1, a bottom second opening 10-2, a bottom third opening 10-3 and a bottom fourth opening 10-4, the first annular channel 3-1 is communicated with the second annular channel 3-2 through the bottom first opening 10-1, the bottom second opening 10-2, the bottom third opening 10-3 and the bottom fourth opening 10-4, the water inlet pipe 8 is communicated with the first annular channel 3-1, and the water outlet pipe 9 is communicated with the second annular channel 3-2.
As shown in fig. 1-4, a phase-change energy-storage double-pipe geothermal heat exchanger includes a cover plate first opening 4-1, a cover plate second opening 4-2, a cover plate third opening 4-3, and a cover plate fourth opening 4-4, which are fan-shaped annular openings; the fifth opening 4-5 and the sixth opening 4-6 of the cover plate are arc-shaped openings; the first opening 4-1 of the cover plate, the second opening 4-2 of the cover plate, the third opening 4-3 of the cover plate and the fourth opening 4-4 of the cover plate are symmetrically arranged relative to the circular cover plate; the fifth opening 4-5 and the sixth opening 4-6 of the cover plate are arranged at the inner sides of the first opening 4-1, the second opening 4-2, the third opening 4-3 and the fourth opening 4-4 of the cover plate and are symmetrically arranged relative to the connecting plate ribs 4-7, and the size of the openings is determined according to the circulation flow of the geothermal heat exchanger; the first opening 10-1 at the bottom, the second opening 10-2 at the bottom, the third opening 10-3 at the bottom and the fourth opening 10-4 at the bottom are symmetrically arranged around the circle center, and the size of the openings is determined according to the circulation flow of the geothermal heat exchanger; the water inlet pipe 8 is communicated with the first annular channel 3-1 through a cover plate fifth opening 4-5 and a cover plate sixth opening 4-6 in the top cover plate 4; the water outlet pipe 9 is communicated with the second annular channel 3-2 through a cover plate first opening 4-1, a cover plate second opening 4-2, a cover plate third opening 4-3 and a cover plate fourth opening 4-4 in the top cover plate 4; the phase-change material 7 under the summer working condition is mixed acid with the melting point temperature ranging from 25 ℃ to 30 ℃, and the phase-change material 8 under the winter working condition is oleic acid with the phase-change temperature ranging from 5 ℃ to 10 ℃.
As shown in fig. 1 to 4, the phase change energy storage double pipe geothermal heat exchanger works as follows: after entering a water inlet pipe 9 through a water separator, heat (cold water) from the condenser (evaporator) side of the machine room flows into a first annular channel 3-1 through a fifth opening 4-5 of a cover plate of a top cover plate 4 and a sixth opening 4-6 of the cover plate, part of heat is stored in a phase-change material 6 under summer working conditions by fluid in summer (part of cold is stored in a phase-change material 7 under winter working conditions by fluid in summer), enters a second annular channel 3-2 through a first opening 10-1 at the bottom, a second opening 10-2 at the bottom, a third opening 10-3 at the bottom and a fourth opening 10-4 at the bottom, enters a water outlet pipe 9 through a first opening 4-1 of the cover plate, a second opening 4-2 of the cover plate, a third opening 4-3 of the cover plate and a fourth opening 4-4 of the cover plate in the top cover plate 4 after exchanging heat with surrounding soil, and then returns to a water collector at the condenser (evaporator) side of, thereby completing a complete heat exchange cycle. The invention respectively encapsulates two phase-change materials which are suitable for operating under working conditions in summer and winter between the central tube of the sleeve-type geothermal heat exchange and the water inlet and outlet flow channel, and can delay the change amplitude of the soil temperature, reduce the thermal response radius, reduce the thermal short circuit between the water inlet and outlet channels and simultaneously improve the energy storage and heat transfer performance of the water inlet and outlet channels by the heat absorption and heat release of the phase-change materials through the phase change.
Claims (5)
1. A phase change energy storage bushing type geothermal heat exchanger which characterized in that: the geothermal heat exchanger consists of a central pipe (1), a first sleeve (2-1), a second sleeve (2-2), a third sleeve (2-3), a first annular channel (3-1), a second annular channel (3-2), a top cover plate (4), a bottom cover plate (5), a summer working condition phase change material (6), a winter working condition phase change material (7), a water inlet pipe (8) and a water outlet pipe (9); the central tube (1) is arranged in the center of the geothermal heat exchanger, and the first sleeve (2-1), the second sleeve (2-2) and the third sleeve (2-3) take the center of the central tube (1) as the center of a circle and are sequentially sleeved on the outer side of the central tube (1) along the radius increasing direction; the first annular channel (3-1) is formed by a space enclosed by the central pipe (1) and the first sleeve (2-1); the second annular channel (3-2) is formed by a space enclosed by the second sleeve (2-2) and the third sleeve (2-3); the summer working condition phase change material (6) is packaged in the central pipe (1); the winter working condition phase change material (7) is packaged in an annular space surrounded by the first sleeve (2-1) and the second sleeve (2-2); the top cover plate (4) and the bottom cover plate (5) are respectively in hot melting connection with the top and the bottom of the geothermal heat exchanger; a first cover plate opening (4-1), a second cover plate opening (4-2), a third cover plate opening (4-3), a fourth cover plate opening (4-4), a fifth cover plate opening (4-5), a sixth cover plate opening (4-6) and connecting plate ribs (4-7) are arranged on the top cover plate (4); the joint of an annular closed space formed by the first sleeve (2-1) and the second sleeve (2-2) and the bottom cover plate (5) is provided with a first bottom opening (10-1), a second bottom opening (10-2), a third bottom opening (10-3) and a fourth bottom opening (10-4), the first annular channel (3-1) is communicated with the second annular channel (3-2) through the first bottom opening (10-1), the second bottom opening (10-2), the third bottom opening (10-3) and the fourth bottom opening (10-4), the water inlet pipe (8) is communicated with the first annular channel (3-1), and the water outlet pipe (9) is communicated with the second annular channel (3-2).
2. The phase-change energy storage bushing type geothermal heat exchanger according to claim 1, wherein: the first opening (4-1) of the cover plate, the second opening (4-2) of the cover plate, the third opening (4-3) of the cover plate and the fourth opening (4-4) of the cover plate are fan-shaped annular openings; the fifth opening (4-5) and the sixth opening (4-6) of the cover plate are arc-shaped openings; the first opening (4-1) of the cover plate, the second opening (4-2) of the cover plate, the third opening (4-3) of the cover plate and the fourth opening (4-4) of the cover plate are symmetrically arranged around the circular cover plate; the cover plate fifth opening (4-5) and the cover plate sixth opening (4-6) are arranged on the inner sides of the cover plate first opening (4-1), the cover plate second opening (4-2), the cover plate third opening (4-3) and the cover plate fourth opening (4-4) and are symmetrically arranged relative to the connecting plate ribs (4-7), and the sizes of the openings are determined according to the circulation flow of the geothermal heat exchanger.
3. The phase-change energy storage bushing type geothermal heat exchanger according to claim 1, wherein: the first bottom opening (10-1), the second bottom opening (10-2), the third bottom opening (10-3) and the fourth bottom opening (10-4) are symmetrically arranged around the circle center, and the size of the openings is determined according to the circulation flow of the geothermal heat exchanger.
4. The phase-change energy storage bushing type geothermal heat exchanger according to claim 1, wherein: the water inlet pipe (8) is communicated with the first annular channel (3-1) through a cover plate fifth opening (4-5) and a cover plate sixth opening (4-6) in the top cover plate (4); the water outlet pipe (9) is communicated with the second annular channel (3-2) through a first cover plate opening (4-1), a second cover plate opening (4-2), a third cover plate opening (4-3) and a fourth cover plate opening (4-4) in the top cover plate (4).
5. The phase-change energy storage bushing type geothermal heat exchanger according to claim 1, wherein: the summer working condition phase-change material (6) adopts mixed acid with the melting point temperature ranging from 25 ℃ to 30 ℃, and the winter working condition phase-change material (7) adopts oleic acid with the phase-change temperature ranging from 5 ℃ to 10 ℃.
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| CN201811292145.8A CN109405616B (en) | 2018-11-01 | 2018-11-01 | Phase-change energy-storage sleeve type geothermal heat exchanger |
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| CN201811292145.8A CN109405616B (en) | 2018-11-01 | 2018-11-01 | Phase-change energy-storage sleeve type geothermal heat exchanger |
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| CN109405616B true CN109405616B (en) | 2020-03-31 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110486960B (en) * | 2019-08-06 | 2020-07-07 | 西安科技大学 | Multi-melting-point deep well heat exchange device and experimental equipment with same |
| US20230053884A1 (en) * | 2020-01-10 | 2023-02-23 | Phase Change Energy Solutions, Inc. | Systems and methods for district heating and cooling |
| CN111335299A (en) * | 2020-03-12 | 2020-06-26 | 扬州大学 | Quincunx phase-change geothermal energy pile and using method thereof |
| CN111578518A (en) * | 2020-05-19 | 2020-08-25 | 江苏建筑职业技术学院 | Phase-change energy-storage heat exchange device |
| CN111928319A (en) * | 2020-07-29 | 2020-11-13 | 天津大学 | Full-cylinder type heat storage and heat exchange integrated well |
| CN111928321A (en) * | 2020-08-13 | 2020-11-13 | 天津大学 | Heat accumulation and heat exchange integrated well structure in core pipe |
| CN112833573B (en) * | 2020-12-31 | 2022-11-18 | 魏巍 | Medium-deep geothermal energy same-well balanced mining and irrigating heat exchange system and application |
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| CN101782284A (en) * | 2009-01-19 | 2010-07-21 | 刘伟杰 | Phase-change heat storage water tank used for solar water heater |
| WO2013186983A1 (en) * | 2012-06-14 | 2013-12-19 | 株式会社デンソー | Cold storage heat exchanger |
| CN104373758A (en) * | 2014-10-31 | 2015-02-25 | 东南大学 | Solar heat preservation structure used for cross-season heat storage technology |
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