CN108204759B - Heat pipe heat storage heat exchanger with variable communication pipe quantity - Google Patents
Heat pipe heat storage heat exchanger with variable communication pipe quantity Download PDFInfo
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- CN108204759B CN108204759B CN201810148400.5A CN201810148400A CN108204759B CN 108204759 B CN108204759 B CN 108204759B CN 201810148400 A CN201810148400 A CN 201810148400A CN 108204759 B CN108204759 B CN 108204759B
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- 238000005338 heat storage Methods 0.000 title claims abstract description 24
- 238000004891 communication Methods 0.000 title claims description 21
- 238000001704 evaporation Methods 0.000 claims abstract description 33
- 230000008020 evaporation Effects 0.000 claims abstract description 30
- 230000005494 condensation Effects 0.000 claims abstract description 15
- 238000009833 condensation Methods 0.000 claims abstract description 15
- 230000005484 gravity Effects 0.000 claims abstract description 5
- 239000011232 storage material Substances 0.000 claims description 15
- 239000012188 paraffin wax Substances 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 abstract description 34
- 238000010438 heat treatment Methods 0.000 abstract description 20
- 230000008859 change Effects 0.000 abstract description 11
- 238000010521 absorption reaction Methods 0.000 description 22
- 238000009826 distribution Methods 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 11
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- 238000009825 accumulation Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 230000000191 radiation effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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- 238000004781 supercooling Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Images
Classifications
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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
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
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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
- F28D20/021—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat the latent heat storage material and the heat-exchanging means being enclosed in one container
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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
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention provides a heat pipe heat storage exchanger with variable communicating pipes, which comprises a gravity heat pipe, wherein the heat pipe comprises an evaporation end and a condensation end, the evaporation end is arranged in a heat accumulator, the heat accumulator is arranged in a heat source, the condensation end is arranged in a container of a cold source, the evaporation end comprises a plurality of end parts, a plurality of communicating pipes are arranged between the adjacent end parts, and the number of the communicating pipes is continuously increased from the center of the heat accumulator to the outer wall direction of the heat accumulator. The invention can ensure that the pressure is balanced as soon as possible in the heating process of the fluid through the change of the number of the communicating pipes.
Description
Technical Field
The invention relates to a heat exchanger technology, in particular to a heat pipe heat storage heat exchanger.
Background
The heat pipe technology is a heat transfer element called a heat pipe invented by George Grover (George Grover) of national laboratory of Los Alamos (Los Alamos) in 1963, fully utilizes the heat conduction principle and the rapid heat transfer property of a phase change medium, quickly transfers the heat of a heating object to the outside of a heat source through the heat pipe, and the heat conduction capability of the heat transfer element exceeds the heat conduction capability of any known metal.
The heat pipe technology is widely applied to the industries of aerospace, military industry and the like, and since the heat pipe technology is introduced into the radiator manufacturing industry, the design idea of the traditional radiator is changed for people, the single heat radiation mode that a high-air-volume motor is used for obtaining a better heat radiation effect is avoided, the heat pipe technology is adopted for enabling the radiator to obtain a satisfactory heat exchange effect, and a new place in the heat radiation industry is opened up. At present, the heat pipe is widely applied to various heat exchange devices, including the field of nuclear power, such as the utilization of waste heat of nuclear power.
In the prior art, the shape of the heat pipe influences the heat absorption area of the evaporation end, so that the heat absorption range of the evaporation end is smaller, and a plurality of heat pipes are sometimes required to be arranged in a heat source to meet the heat absorption requirement; when multiple evaporation ends exist, the evaporation ends can absorb heat unevenly because the positions of the evaporation ends at the heat source are different.
In the prior heat pipe heat accumulator, the gravity heat pipe is basically adopted, and the heating area is small because the pipe diameters of evaporation ends of condensation ends of the heat pipes are the same, so that the heat exchange area cannot be better expanded.
Disclosure of Invention
The invention provides a new heat pipe structure, which can balance the pressure of the evaporation end and save energy.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides a heat pipe heat accumulation heat exchanger of communicating pipe quantity change, includes the gravity heat pipe, the heat pipe includes evaporating end and condensation end, the evaporating end sets up in the heat accumulator, the heat accumulator sets up in the heat source, the condensation end sets up in the container of cold source, the evaporating end includes a plurality of tip, sets up a plurality of communicating pipes between the adjacent tip, from the center of heat accumulator to the outer wall direction of heat accumulator, communicating pipe constantly increases in quantity.
Preferably, the number of the communication pipes is increased from the center of the heat accumulator to the outer wall of the heat accumulator to a larger extent.
Preferably, the heat source is geothermal energy.
Preferably, the melting point of the heat storage material in the heat accumulator is 60-80 degrees celsius.
Preferably, the heat storage material in the heat accumulator is paraffin.
Preferably, the cross-sectional area of the regenerator is 10 to 26 times the cross-sectional area of the vessel.
Preferably, the heat pipe comprises a vertical part, a horizontal part and a vertical pipe, wherein the bottom end of the vertical part is communicated with the horizontal part, the horizontal part extends from the bottom end of the vertical part to the direction far away from the vertical part, the lower part of the horizontal part is communicated with a plurality of vertical pipes, the vertical pipe is the evaporation end of the heat pipe, and the vertical part is the condensation end of the heat pipe.
Preferably, the horizontal part has a flat tube structure, and the vertical tube has a circular tube structure.
Preferably, the horizontal portion has a square structure.
Preferably, the vertical tubes are arranged in a plurality of rows, wherein two adjacent rows are arranged in a staggered manner.
Preferably, the circle centers of the vertical pipes and the circle centers of two adjacent vertical pipes in the adjacent row form an isosceles triangle, and the circle centers of the vertical pipes are located at the positions of points at the vertex angles of the isosceles triangle.
As preferred, the external diameter of vertical pipe is d, and the distance between the adjacent vertical pipe centre of a circle of same row is L, and the centre of a circle of vertical pipe 3 constitutes isosceles triangle's apex angle with two vertical pipe centre of a circle that are close to of adjacent row and is A, then satisfies following requirement:
sin (a) ═ a-b Ln (d/L), where Ln is a logarithmic function and a, b are parameters, satisfying the following requirements:
0.095<a<0.105,0.29<b<0.31；0.1<d/L<0.7。
preferably, a is larger and b is larger as d/L is smaller.
Preferably, 15 ° < a <80 °.
Preferably, 20 ° < a <40 °.
Preferably, 0.2< d/L < 0.5.
Compared with the prior art, the invention has the following advantages:
1) the invention is to arrange the communicating pipes with more communicating areas through the change of the number of the communicating pipes, because the direction of the outer wall of the heat accumulator 4 is closer, the heat accumulation amount is the most, the fluid is heated more, and the steam pressure in the vertical pipe 3 is larger, so the pressure balance can be ensured to be achieved as soon as possible in the heating process of the fluid through the arrangement.
2) According to the invention, the cross sectional area of the heat accumulator is larger than that of the container in which the cold source is positioned, so that the heat exchange area between the heat accumulator and the heat source can be further increased, more heat can be stored, and the heating requirement can be further met.
3) The invention improves the structure of the evaporation end of the heat pipe, extends the evaporation end of the heat pipe to a farther direction, and increases the heat absorption area of the evaporation end of the heat pipe under the condition of not changing the volume of the condensation end of the heat pipe, thereby enlarging the heat absorption range of the heat pipe and absorbing the heat at the farthest end of a heat source. Compared with the heat pipe in the prior art, the heat exchange efficiency can be improved by more than 40 percent by keeping the evaporation end and the condensation end of the heat pipe in consistent sizes. Meanwhile, the volume and the occupied area of the heat exchanger are reduced, so that the structure is compact.
4) According to the invention, the communicating pipe is arranged at the adjacent evaporation ends, so that under the condition that the pressures of the vertical pipes are different due to different heating, the fluid in the evaporation end with large pressure can quickly flow to the evaporation end with small pressure, thereby keeping the overall pressure balance and avoiding local overheating or overcooling.
5) A large amount of numerical simulation and experimental researches are carried out, the optimal structure of the distribution structure of the heat pipes in the heat accumulator is carried out, the optimal relational expression of the heat pipe distribution is obtained through the researches, the heat pipe distribution is further improved, the optimal heat absorption is achieved, and the cost is reduced.
6) The communicating pipe is arranged between the adjacent heat pipes, so that the pressure balance and the heat exchange balance between the heat pipes are realized.
Drawings
FIG. 1 is a schematic view of a heat pipe structure according to the present invention.
Fig. 2 is a schematic view of fig. 1 as viewed from the bottom.
Fig. 3 is a schematic view of a partial structure of a heat pipe provided with a communication pipe according to the present invention.
FIG. 4 is a schematic structural diagram of a heat pipe according to an embodiment of the present invention.
Fig. 5 is a schematic structural view of the communication pipe arranged between the heat pipes of fig. 4.
Fig. 6 is a partially enlarged illustration of fig. 2.
In the figure: 1 vertical part 2 horizontal part 3 vertical pipe 4 heat accumulator 5 cold source 6 heat source 7 communicating pipe 8 communicating pipe 9 container
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
In this document, "/" denotes division and "×", "denotes multiplication, referring to formulas, if not specifically stated.
The following detailed description of embodiments of the invention refers to the accompanying drawings.
A heat pipe comprises a vertical part 1, a horizontal part 2 and a vertical pipe 3, wherein the bottom end of the vertical part 1 is communicated with the horizontal part 2, the horizontal part 2 extends from the bottom end of the vertical part 1 to the direction far away from the vertical part 1, the lower part of the horizontal part 2 is communicated with a plurality of vertical pipes 3, the vertical pipes 3 are evaporation ends of the heat pipe, and the vertical part 1 is a condensation end of the heat pipe.
In the operation of the heat pipe, the heat is absorbed from a heat source through the vertical pipe 3, then the fluid in the vertical pipe 3 is evaporated, enters the vertical part through the horizontal part, then releases the heat to a cold source in the vertical part, condenses the fluid, and enters the vertical pipe 3 under the action of gravity.
The invention improves the structure of the heat pipe through arranging the evaporation end of the heat pipe, extends the evaporation end of the heat pipe to a farther direction, and increases the heat absorption area of the evaporation end of the heat pipe under the condition of not changing the volume of the condensation end of the heat pipe, thereby expanding the heat absorption range of the heat pipe and absorbing the heat at the farthest end of a heat source. Compared with the heat pipe in the prior art, the heat exchange efficiency can be improved by more than 45 percent by keeping the evaporation end and the condensation end of the heat pipe in consistent sizes. Meanwhile, the volume and the occupied area of the condensation end are reduced, so that the structure is compact.
In addition, the plurality of vertical pipes 3 are arranged as the evaporation ends of the heat pipes, so that each vertical pipe 3 is used as an independent heat absorption pipe to absorb heat, and the heat absorption area of the evaporation end of the whole heat pipe is increased.
Preferably, the heat source may be soil or boiler off-gas, etc.
Preferably, the cold source is water or air.
Preferably, the horizontal part 2 is of a flat tube structure, and the vertical tube 3 is of a circular tube structure. By providing the horizontal portion with a flat tube structure, the distribution of the vertical tubes 3 can be increased, further improving the heat absorption.
Further preferably, the horizontal portion 2 has a square configuration.
Preferably, as shown in fig. 2, the vertical tubes 3 are arranged in a plurality of rows, wherein two adjacent rows are arranged in a staggered manner. By the staggered arrangement, the heat absorption capacity of the heat pipe can be further improved.
Preferably, the vertical tubes 3 are located on an extension of a center line of circle center connecting line segments of adjacent vertical tubes 3 of adjacent rows. Namely, the circle centers of the vertical pipes 3 and the circle centers of the two adjacent vertical pipes 3 in the adjacent row form an isosceles triangle, and the circle centers of the vertical pipes are positioned at the points of the vertex angles of the isosceles triangle.
Preferably, as shown in fig. 3, a communicating tube 8 is provided between at least two adjacent vertical tubes 3. In the research, it is found that in the process of absorbing heat in the vertical section, different absorption heat amounts of the heat absorbing pipes at different positions can occur, so that the pressure or the temperature between the vertical pipes 3 is different, thus causing that part of the vertical pipes 3 are heated too high, and the service life is shortened, and once one vertical pipe 3 is out of order, the problem that the whole heat pipe cannot be used can be caused. According to a large amount of research, the communicating pipes 8 are arranged on the adjacent vertical pipes, so that under the condition that the vertical pipes are heated differently to cause different pressures, the fluid in the vertical pipe 3 with high pressure can quickly flow to the vertical pipe 3 with low pressure, the overall pressure balance is kept, and local overheating or overcooling is avoided.
Preferably, a plurality of communication pipes 8 are provided between the adjacent vertical pipes 3 from the lower portion of the vertical pipe 3 to the upper portion of the vertical pipe 3. Through setting up a plurality of communicating pipes, can make the continuous balanced pressure of fluid in the heat absorption evaporation process, guarantee the pressure balance in the whole vertical intraductal.
Preferably, the distance between the adjacent communication pipes 8 is continuously decreased from the lower portion of the vertical pipe 3 to the upper portion of the vertical pipe 3. The purpose is to arrange more communicating pipes, because the fluid is continuously heated along with the upward flow of the fluid, and the heating in different heat collecting pipes is more and more uneven along with the continuous heating of the fluid, so that the pressure balance can be achieved as soon as possible in the flowing process of the fluid through the arrangement.
Preferably, the distance between the adjacent communication pipes is decreased more and more from the lower portion of the vertical pipe 3 to the upper portion of the vertical pipe 3. Experiments show that the arrangement can ensure that the pressure balance is achieved more optimally and more quickly in the fluid flowing process. This is also the best way of communicating by extensively studying the law of change of the pressure distribution.
Preferably, the diameter of the communication pipe 8 is continuously increased from the lower portion of the vertical pipe 3 to the upper portion of the vertical pipe 3. The purpose is to ensure a larger communication area, because the fluid is continuously heated along with the upward flow of the fluid, and the heating in different heat collecting pipes is more and more uneven along with the continuous heating of the fluid, so that the pressure balance can be ensured to be achieved as soon as possible in the flowing process of the fluid through the arrangement.
Preferably, the diameter of the communication pipe 8 is increased more and more from the lower portion of the vertical pipe 3 to the upper portion of the vertical pipe 3. Experiments show that the arrangement can ensure that the pressure balance is achieved more optimally and more quickly in the fluid flowing process. This is also the best way of communicating by extensively studying the law of change of the pressure distribution.
Fig. 4 shows a heat pipe utilization system, and preferably, as shown in fig. 4, a vertical pipe 3 of a heat pipe is provided in a heat accumulator 4. The heat accumulator 4 is provided in the heat source. The heat source may be geothermal energy.
Preferably, the melting point of the thermal storage material in the thermal storage 4 is 60-80 degrees celsius, preferably 65 degrees celsius.
Preferably, the heat storage material in the heat accumulator 4 is paraffin.
The heat accumulator 4 is arranged, so that heat in the heat source 6 can be stored, more heat can be stored due to larger hot melting of the heat accumulator, the heat pipe can more fully utilize the heat of the dry heat source 6, the contact area between the heat accumulator and the heat source 6 is larger due to the arrangement of the heat accumulator, the contact thermal resistance between the heat pipe and the heat source 6 can be greatly reduced, the installation is convenient, and the heat absorption effect is far better than that of the heat pipe which is independently arranged in the heat source 6. Therefore, the heat absorption efficiency of the heat pipe can be greatly improved by arranging the heat accumulator. Experiments show that the heating efficiency can be improved by 15-20% by arranging the heat accumulator, and energy can be further saved.
Preferably, the heat source is geothermal energy of dry-hot rock formations, the cold source is water, and the heat pipe is used for heating water to generate steam in shale gas exploitation and introducing the steam into the shale formations to carry out shale gas exploitation.
Preferably, the cross section of the heat accumulator 4 is a square structure, and the cross section area of the heat accumulator 4 is larger than that of the container 9 in which the cold source is arranged. The cross section area of the heat accumulator 4 is larger than that of the container 9 where the cold source is located, so that the heat exchange area between the heat accumulator and the heat source 6 can be further increased, more heat can be stored, and the heating requirement can be further met.
Preferably, the cross-sectional areas of the regenerator 4 and the vessel 9 are of square configuration. The side length of the heat accumulator 4 is greater than the side length of the container 9.
Preferably, the cross-sectional area of the regenerator 4 is 10 to 26 times, preferably 18 times, the cross-sectional area of the vessel 9.
Preferably, the heat storage capacity of the heat storage material in the regenerator 4 gradually becomes weaker in a direction from the center of the regenerator 4 toward the outer wall of the regenerator.
By gradually changing the heat storage capacity of the heat storage material, the heat storage capacity can be further improved, and uniform heating of the vertical tubes 3 can be realized. Since the temperature is highest at the outer wall of the heat accumulator because the heat accumulator is in direct contact with the heat source, the heat storage material can be directly heated, and after the heat storage material is sufficiently stored, the heat can be transferred to the inside of the heat accumulator. Through the change of the heat storage capacity of the heat storage material of the heat accumulator, the heat can be immediately transferred to the inner part after the external heat storage material reaches the heat storage saturation, and the heat can be also stored in the inner part. Like this, vertical pipe 3 can both fully absorb heat in the different positions of heat accumulator, avoids some heat pipes overheated, and some heat pipes absorb heat inadequately, guarantees that the heat absorption of whole heat pipe is even, avoids some superheated steam to damage, causes the maintenance difficulty of product. Through the arrangement, the service life of the whole heat pipe can be the same. And meanwhile, the cold source is uniformly heated integrally.
Preferably, the width of the gradual decrease in the heat storage capacity of the heat storage material gradually increases from the center of the heat accumulator 4 toward the outer wall of the heat accumulator 4. Experiments and numerical simulation show that the heat absorption uniformity of the heat pipe can be further improved by adopting the arrangement.
Preferably, the number of the communicating tubes 8 increases from the center of the heat accumulator 4 toward the outer wall of the heat accumulator 4. The purpose is to set more communicating pipes, because the direction of the outer wall of the heat accumulator 4 is closer, the heat accumulation amount is the most, the fluid is heated more, and the steam pressure in the vertical pipe 3 is larger, so that the pressure equalization can be ensured to be achieved as soon as possible in the heating process of the fluid through the arrangement.
Preferably, the number of communicating tubes 8 increases from the center of the heat accumulator 4 to the outer wall of the heat accumulator 4 to a larger extent. Experiments show that the pressure equalization can be achieved more optimally and more quickly in the fluid heating process by the aid of the arrangement. This is also the best way of communicating by extensively studying the law of change of the pressure distribution.
Preferably, the diameter of the communicating pipe 8 increases from the center of the heat accumulator 4 toward the outer wall of the heat accumulator 4. This purpose is in order to set up and guarantee bigger intercommunication area, because the outer wall direction that is close to heat accumulator 4 more, the heat accumulation is the most, and the fluid is heated also much, and the steam pressure in the vertical pipe 3 is also big more, consequently through above-mentioned setting, can guarantee to reach pressure equilibrium as early as possible in the fluid heating process.
Preferably, the communication pipe 8 increases in diameter from the center of the heat accumulator 4 toward the outer wall of the heat accumulator 4 to a larger extent. Experiments show that the arrangement can ensure that the pressure balance is achieved more optimally and more quickly in the fluid flowing process. This is also the best way of communicating by extensively studying the law of change of the pressure distribution.
The heat accumulator is filled with paraffin for heat accumulation. The paraffin phase-change heat storage material has the advantages of high phase-change latent heat, almost no supercooling phenomenon, low vapor pressure during melting, difficult chemical reaction, good chemical stability, no phase separation and corrosivity, low price and the like, and becomes the first choice of the heat storage material. Paraffin is embedded in the vertical pipe 3. The vertical pipe 3 absorbs heat from paraffin in the heat accumulator, and releases heat in the vertical part at the top end, so that the cold source is heated.
Through numerical simulation and experiment discovery, the distance between the vertical pipe 3, including the distance of same row and the distance between the adjacent row can not the undersize, the undersize can lead to the heat pipe to distribute too much, leads to the heat absorption capacity of every heat pipe not enough, and too big can lead to the heat pipe to distribute too little, leads to the heat pipe overheated, consequently this application through a large amount of numerical simulation and experiment, summarizes out the distribution of the optimization that the vertical pipe 3 of heat pipe distribute for the heat pipe can neither the heat absorption capacity not enough, can not the heat absorption capacity too big again.
As shown in fig. 6, the outer diameter of the vertical pipe 3 is d, the distance between the centers of the adjacent vertical pipes 3 in the same row is L, the center of the vertical pipe 3 and the centers of the adjacent two vertical pipes 3 in the adjacent row form an isosceles triangle, and the vertex angle of the isosceles triangle is a, so that the following requirements are met:
sin (a) ═ a-b Ln (d/L), where Ln is a logarithmic function and a, b are parameters, satisfying the following requirements:
0.095<a<0.105,0.29<b<0.31；
more preferably, a is 0.1016 and b is 0.3043.
Preferably, a is larger and b is larger as d/L is smaller.
Preferably, 15 ° < a <80 °.
Further preferably, 20 ° < a <40 °.
0.1< d/L <0.7, more preferably 0.2< d/L < 0.5.
The empirical formula is obtained through a large number of numerical simulations and experiments, the optimized heat pipe structure can be realized through the structure obtained through the relational expression, and the error is basically within 3% through experimental verification.
The heat absorption capacity of the heat pipe is 900-1100W, and more preferably 1000W;
the temperature of the heat source is 100-120 ℃, and more preferably 110 ℃.
The horizontal portion of the heat pipe shown in fig. 2 is preferably square with a side length of 400 mm and 600 mm, and more preferably 500 mm.
The vertical tube 3 has an outer diameter d of 9 to 12 mm, more preferably 11 mm.
Preferably, as shown in fig. 4, the system comprises two heat pipes, and the horizontal parts 2 of the two heat pipes extend towards opposite directions respectively.
Preferably, as shown in fig. 5, a communication pipe 7 is provided between the vertical pipes 3 of the two heat pipes adjacent to each other. Through setting up communicating pipe, can avoid being heated unevenly between the heat pipe, realize the pressure balance between the heat pipe, avoid the defect that the inhomogeneous results in of being heated between the different heat pipes.
Preferably, the distance between the adjacent communication pipes 7 is continuously decreased from the lower portion of the vertical pipe 3 to the upper portion of the vertical pipe 3. The purpose is to arrange more communicating pipes, because the fluid is continuously heated along with the upward flow of the fluid, and the heating in different heat pipes is more and more uneven along with the continuous heating of the fluid, so that the pressure balance can be ensured to be achieved as soon as possible in the flowing process of the fluid through the arrangement.
Preferably, the distance between the adjacent communication pipes 7 is decreased more and more from the lower portion of the vertical pipe 3 to the upper portion of the vertical pipe 3. Experiments show that the arrangement can ensure that the pressure balance is achieved more optimally and more quickly in the fluid flowing process. This is also the best way of communicating by extensively studying the law of change of the pressure distribution.
Preferably, the diameter of the communication pipe 7 is continuously increased from the lower portion of the vertical pipe 3 to the upper portion of the vertical pipe 3. The purpose is to ensure a larger communication area, because the fluid is continuously heated along with the upward flow of the fluid, and the heating in different heat pipes is more and more uneven along with the continuous heating of the fluid, so that the pressure balance can be ensured to be achieved as soon as possible in the fluid flowing process through the arrangement.
Preferably, the diameter of the communication pipe 7 is increased more and more from the lower portion of the vertical pipe 3 to the upper portion of the vertical pipe 3. Experiments show that the arrangement can ensure that the pressure balance is achieved more optimally and more quickly in the fluid flowing process. This is also the best way of communicating by extensively studying the law of change of the pressure distribution.
Although the present invention has been described with reference to the preferred embodiments, it is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A heat pipe heat storage heat exchanger with variable communication pipes comprises gravity heat pipes, wherein each heat pipe comprises an evaporation end and a condensation end, the evaporation end is arranged in a heat accumulator, the heat accumulator is arranged in a heat source, the condensation end is arranged in a container of a cold source, the evaporation end comprises a plurality of end parts, a plurality of communication pipes are arranged between the adjacent end parts, and the number of the communication pipes is continuously increased from the center of the heat accumulator to the outer wall direction of the heat accumulator; the amplitude of the continuous increase of the number of the communicating pipes is larger and larger from the center of the heat accumulator to the outer wall direction of the heat accumulator; the heat pipe comprises a vertical part, a horizontal part and a vertical pipe, wherein the bottom end of the vertical part is communicated with the horizontal part, the horizontal part extends from the bottom end of the vertical part to the direction far away from the vertical part, the lower part of the horizontal part is communicated with a plurality of vertical pipes, the vertical pipe is an evaporation end of the heat pipe, and the vertical part is a condensation end of the heat pipe; set up communicating pipe between the vertical pipe of two heat pipes that are close to each other, from vertical pipe lower part to vertical pipe upper portion, the distance between the adjacent communicating pipe constantly reduces.
2. The heat exchanger of claim 1, wherein the heat source is geothermal energy.
3. The heat exchanger of claim 1, wherein the melting point of the thermal storage material in the regenerator is 60-80 degrees celsius.
4. The heat exchanger of claim 1, wherein the heat storage material in the heat accumulator is paraffin.
5. The heat exchanger of claim 1 wherein the vertical tubes are in a plurality of rows, and wherein adjacent rows are in a staggered arrangement.
6. The heat exchanger of claim 5, wherein the centers of the vertical tubes and the centers of two adjacent vertical tubes in an adjacent row form an isosceles triangle, and the centers of the vertical tubes are located at the points of the vertex angles of the isosceles triangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| US7004231B2 (en) * | 2003-04-07 | 2006-02-28 | Tai-Her Yang | Natural thermo carrier fluid exchange system for heat reclaim |
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| CN104236359B (en) * | 2014-10-09 | 2016-02-03 | 上海交通大学 | A kind of step phase-transition heat-storage heat release integrated apparatus adopting metal foam |
| CN105241160A (en) * | 2015-05-11 | 2016-01-13 | 北京工业大学 | Heat storage defrosting system and method used for air-cooled refrigerator |
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| CN207991342U (en) * | 2018-02-13 | 2018-10-19 | 国网山东节能服务有限公司 | A kind of heat pipe heat accumulation heat exchanger of communicating pipe quantity variation |
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