CN109668328A - A kind of evacuated collector tube with the semi-circumference unilateral side fin body being threadingly advanced - Google Patents
A kind of evacuated collector tube with the semi-circumference unilateral side fin body being threadingly advanced Download PDFInfo
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- CN109668328A CN109668328A CN201811588609.XA CN201811588609A CN109668328A CN 109668328 A CN109668328 A CN 109668328A CN 201811588609 A CN201811588609 A CN 201811588609A CN 109668328 A CN109668328 A CN 109668328A
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- tube
- fin body
- heat absorption
- metal heat
- absorption tube
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/44—Heat exchange systems
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
A kind of evacuated collector tube with the semi-circumference unilateral side fin body being threadingly advanced, it is coaxially arranged from outer to inner to have outer glass tube (1) and the metal heat absorption tube (2) containing fin body (4).It is vacuum chamber (6) between outer glass tube (1) and metal heat absorption tube (2), is connected by sealing device, expansion joint (3) is arranged in the end of outer glass tube (1).The outer surface of metal heat absorption tube (2) is coated with selection and absorbs sun light coating, and inner surface is equipped with the fin body (4) integrated with metal heat absorption tube.Fin body (4) single-sided arrangement in metal heat absorption tube inner wall semi-circumference, while with three-dimensional spiral shape it is vertical or it is inclined along metal heat absorption tube axial alignment advance.The height h of fin body (4) constant or according to energy-flux density height distribution and it is different, be arranged in the height of the fin body height of the high side of energy-flux density less than the fin body in the low side of energy-flux density.
Description
Technical field
The present invention relates to a kind of solar vacuum heat-collecting pipes.
Background technique
In the system of solar thermal utilization, line focus condenser system can such as paraboloid trough type, linear Fresnel formula
It generates and is up to tens kilowatts every square metre even higher energy-flux density.Thermal-collecting tube on condenser focal plane is efficient
Hot-cast socket component generallys use interlayer vacuum-pumping between outer glass tube and metal heat absorption tube sealing-in, outer glass tube and metal heat absorption tube
The evacuated collector tube of form.The outer wall of metal heat absorption tube is coated with coating for selective absorption, to improve the absorption efficiency to sunlight,
Reduce radiation heat loss.Since the sunlight of condenser converges characteristic, which receives the heated of the sunlight of aggregation
Surface concentrates on the semicircle peripheral wall surfaces of metal pipe outer wall, belongs to unilateral non-homogeneous heated.Energy-flux density week on thermal-arrest heating surface of tubes
To non-uniform Distribution, for heat-transfer fluid in metal heat absorption tube, especially manage in forced-convection heat transfer coefficient it is lesser
Gas flowing, inherently forms great temperature gradient on the tube wall of thermal-collecting tube.Larger temperature gradient is answered with localized hyperthermia's heat
Under power effect, the bending deformation of metal tube may be caused, conference and outer glass tube touching was deformed and occurred to be crushed, and caused true
Sky loss, causes heat waste to uprush, collector efficiency bust.
For the extremely non-uniform distribution character of this energy-flux density, need to improve structure in pipe, augmentation of heat transfer improves temperature
Distribution.There are 3 kinds of improved methods in currently available technology:
Using interposer, reinforcing flow disturbance is one of improved method.Chinese invention patent CN107166753A is mentioned
A kind of evacuated collector tube with inserted rod is gone out, heat-transfer fluid is lower from temperature, the biggish metal heat absorption tube center of flow velocity
The higher metal heat absorption tube near wall of temperature is pressed to, realizes the effect of enhanced heat exchange whereby.Chinese invention patent
CN105546855A proposes a kind of structure that can be used for major diameter evacuated collector tube, which is equipped with sealing open circles
Pipe, hollow circular-tube is externally wrapped with continuous helical fin, plug-in part round tube and metal tubular at toroidal cavity in generate
Spiral flow, augmentation of heat transfer.Plug-in part requires that independent support construction is arranged on inner wall of metal tube, by interposer and metal tube
It is fixedly connected, structure installation is complicated；Plug-in part reduces the effective cross section of flowing, makes fluid flow rate under the conditions of same traffic
Enhancing shortens the contact heat-exchanging time of fluid and the pipe internal surface that absorbs heat.
Using filler, increasing heat transfer area is another improved method.U.S. patent Nos US2012/0186575A1
The structure of the filled and process metal in metal heat absorption tube is proposed, Chinese invention patent CN108302784A discloses a kind of imitative
Invention of the insertion foam metal as filling in raw micropore surface metal inner pipe, but filler can dramatically increase flow resistance.
Using fin, increasing heat transfer area is the third improved method.It is mainly circumferential complete using helicitic texture, twisted sheet etc.
The structure of distribution, CN108120335A disclose a kind of curve fin body equidistantly arranged in inside pipe wall, are in the axial direction in spiral shell
Shape or cross-like arrangement are revolved, Chinese invention patent CN108151572A is provided and arranged multiple groups helical fin structure inside and outside pipe, interior
Outside wing body height is in cyclically-varying.The fin of two kinds of inventions all uses complete cycle distribution mode, although having reached augmentation of heat transfer
Effect, but the power consumption of unnecessary flow resistance, pump and blower is also increased simultaneously.Chinese invention patent CN102425867A is mentioned
The structure of the groove type solar evacuated collector tube of unilateral inner fin, the i.e. interior table in metal heat absorption tube focused solar energy side are gone out
Face is equipped with inner fin, transfers heat to the center in metal heat absorption tube by inner fin, effectively by absorbing pipe optically focused side and pipe
The fluid at center is sufficiently mixed, but can not regulate and control the disturbance of the fluid of non-concentrating side, heat exchange.The invention simultaneously can not be fine
Suitable for gas as heat-transfer fluid, since gas is different from the physical property of liquid, with the wall surface and inner fin of optically focused side
Temperature increases, and viscosity of fluid increases, in addition fin distribution increases flow resistance, makes that fluid is gradually small to resistance, temperature is lower
Region collect flowing, then optically focused side participate in heat exchange fluid gradually decrease.
Summary of the invention
The purpose of the present invention is overcoming the prior art, provide a kind of with the semi-circumference unilateral side fin being threadingly advanced
The evacuated collector tube of body, the evacuated collector tube are suitable for the heat-transfer fluids such as gas or liquid.
Fin body structure of the invention, by tool sharpening mode straight forming, is absorbed heat inside metal heat absorption tube with metal
Pipe is identical material material, does not influence bearing capacity, reliability and the safety of metal heat absorption tube.Fin body of the invention is unilateral
It is arranged in the semi-circumference of metal heat absorption tube inner wall, while vertically or being tilted along metal heat absorption tube axial alignment with three-dimensional spiral shape
Advance.Fin body constant height is different according to the distribution of the height of energy-flux density: being arranged in the wing of the high side of energy-flux density
Sheet body height is less than the height in the fin body of the low side of energy-flux density.The present invention can form whirlpool in metal heat absorption tube
Flowing improves the coefficient of heat transfer of the fluid in metal tube, and solar radiant energy is promoted efficiently to be converted to the thermal energy of heat-transfer fluid, optimization
Flow and heat flux.
In order to achieve the above objectives, The technical solution adopted by the invention is as follows:
A kind of evacuated collector tube with the semi-circumference unilateral side fin body being threadingly advanced sequentially coaxially arranges glass from outer to inner
Glass outer tube and metal heat absorption tube containing fin body.
It is vacuum chamber between the outer glass tube and metal heat absorption tube, is connected by sealing device, and in outer glass tube
End is provided with expansion joint.Vacuum chamber can reduce the outside heat loss through convection loss of metal heat absorption tube.
The outer surface of the metal heat absorption tube is coated with coating for selective absorption, to improve the absorption effect to sunlight
Rate reduces radiation heat loss.The inner surface of metal heat absorption tube is equipped with the fin body integrated with metal heat absorption tube.
The fin body is the discontinuous wing rib of needle wing, and fin cross section is rectangle or circle.The fin body exists
Metal pipe internal surface is vertical or oblique arrangement, with pipe in main flow direction tilt angle within the scope of 60 °~90 °.The wing
For the height h of sheet body in the range of 0.05~0.4D, D is metal bore, and height h is constant or height according to flux-density distribution
Low and different: the fin body height of the side high positioned at energy-flux density is less than the fin body height of the low side of energy-flux density, i.e.,
The height for being arranged in the region of optically focused side is less than the height for being located at the low region of non-concentrating side energy-flux density.
Fin body single-sided arrangement on the inner wall of metal heat absorption tube is equidistantly arranged along semi-circumference；The wing
Sheet body is axially upper along pipe or inclination three-dimensional spiral shape arrangement is advanced.Quantity, spacing, screw pitch of helix of fin body etc. are according to energy
Current density, design temperature, metal tube caliber and processing cost etc. determine.The screw pitch of helix is unsuitable too long or too short, preferably 5~
Within 50mm, within the spacing of fin of helix arrangement, preferably 2~10mm, guarantee heat exchange effect when high energy current density, high temperature
Fruit also ensures the circulation under heat-transfer fluid high viscosity.
Compared with prior art, the present invention has the advantage that
Evacuated collector tube of the invention, fin body single-sided arrangement is in the semi-circumference of metal heat absorption tube inner wall, with three-dimensional spiral shell
Shape is revolved along the pipe distribution mode that axially upper or oblique arrangement is advanced, and heat-transfer fluid temperature on same section can be made more evenly, to drop
Temperature gradient on low tube wall.When the metal heat absorption tube of evacuated collector tube is by sunlight irradiation, towards caustic surface one
Side absorbs the radiant flux of the overwhelming majority, and temperature is apparently higher than the other side, that is, meets the temperature of light side.For tradition or with company
The metal heat absorption tube of continuous fin body, by boundary layer influence, the temperature highest of the neighbouring fluid of the optically focused side wall surface of metal tube meets light side
The temperature of near wall fluid is taken second place, and center fluid temperature (F.T.) is minimum.Under the same terms, when the stream for flowing through thermal-collecting tube of the present invention
Body can be generated secondary eddy-currents by the fin body effect arranged along three-dimensional spiral line in the plane of metal heat absorption tube circumferential direction
Dynamic, such whirlpool forms a series of helical flows with the continuous flow further downstream of the flowing of main flow direction, such vortex is referred to as
Longitudinal Vortex.Fluid is substituting to high-temperature area from compared with low-temperature region by this swirl flow, keeps same section upstream temperature more equal
It is even.
The longitudinal Vortex of the spiral promotes the exchanges of mass and energy between mainstream fluid and near wall boundary layer, indulges
To the disturbance in whirlpool so that boundary layer thickness is thinned, heat transfer process is made to be strengthened.Effectively increase the heat transfer of inside pipe wall and fluid
Effect is gas especially for heat-transfer fluid, and in the case where inputting identical energy-flux density, fin body be can reduce between tube wall and gas
The temperature difference.
Multiple fin bodies of the invention are on metal tube inboard wall of tube body along the unilateral equidistantly arrangement, while fin body of semi-circumference
Advance on being parallel to tube axis direction in the arrangement of three-dimensional spiral shape.It ensure that the fin of circumference on metal heat absorption tube arbitrary section
Region all only accounts for the half of circumference: 0~180 °.Not only it ensure that swirl flow of the fluid in pipe, but also reduced in circulation passage
Flow resistance, reduce unnecessary energy loss.
The constant height of the height fin body of fin body of the invention or according to the height of flux-density distribution and it is different: position
Fin body height in the high side of energy-flux density is less than the fin body height of the low side of energy-flux density.It is this to be different from generally
The height design of fin considers that gas stickiness increases and raised physical characteristic with temperature.By the height for increasing cold side fin body
Degree reduces hot side fin body height, increases gas and flows through the flow resistance overcome required for wall surface cold side, reduces gas and flows through wall
The flow resistance overcome required for the hot side of face guarantees to participate in the flow of the gas of heat exchange in optically focused side wall surface.
Needle wing that fin body of the present invention uses, discontinuous wing rib, and metal tube integrated design increase and heat-transfer fluid
Heat exchange area.The height of fin body, quantity, spacing can according to caliber, energy-flux density, design temperature, heat-transfer fluid physical property plus
Work cost etc. is determining, more flexibly.
Detailed description of the invention
Fig. 1 is thermal-collecting tube structural schematic diagram of the present invention；
Fig. 2 is the fin body Spiral distribution schematic diagram of absorbing pipe of the present invention
Fig. 3 is a form of thermal-collecting tube structural schematic diagram of the present invention；
Fig. 4 is the thermal-collecting tube A-A schematic cross-sectional view of Fig. 3；
Fig. 5 is another form of thermal-collecting tube structural schematic diagram of the invention；
Fig. 6 is the thermal-collecting tube A-A schematic cross-sectional view of Fig. 5；
In figure: inlet wire, 6 vacuum chambers before 1 outer glass tube, 2 metal heat absorption tubes, 3 expansion joints, 4 fin bodies, 5 three-dimensional spirals.
Specific embodiment
The present invention is further illustrated in the following with reference to the drawings and specific embodiments.
A kind of evacuated collector tube with the semi-circumference unilateral side fin body being threadingly advanced, including outer glass tube 1 and contain fin
The metal heat absorption tube 2 of body 4, metal heat absorption tube 2 is located in outer glass tube 1, coaxially arranged.Outer glass tube 1 and metal heat absorption tube 2 are logical
Sealing device connection is crossed, and expansion joint 3 is set in the end of outer glass tube 1.It is true between metal heat absorption tube 2 and outer glass tube 1
Cavity 6.Distribution schematic diagram of the fin body in metal heat absorption tube pipe is as shown in Figure 2.
One of embodiment of thermal-collecting tube of the present invention is as shown in Figure 3.Selective heat-absorbing is coated in the outer wall of metal heat absorption tube 2 to apply
Layer, coating material is black chrome coating.Metal heat absorption tube 2 and fin body 4 are integrated, the production of metal heat absorption tube 2 and fin body 4
Material is stainless steel, and fin body 4 uses needle wing, and the needle wing is made up of Tool in Cutting overall processing.Metal tube internal diameter D
=40mm.
In the circumferential, needle wing is distributed only in unilateral half of the circumference of metal heat absorption tube, on Section A-A as shown in Figure 4.?
In the present embodiment, 13 fins are distributed in 180 ° of angular ranges.In axial direction, 13 needle fin bodies of unilateral side distribution press rotation direction one
The three-dimensional spiral line 5 of cause is arranged in metal pipe internal surface, as shown in Figure 3.The screw pitch of three-dimensional spiral line that the present embodiment is chosen is
48mm, 12 groups of fin bodies of equidistantly distributed in a screw pitch.In the present embodiment, the needle fin is vertical with main flow direction,
Section is rectangle, and needle fin body is 0.1D in the optically focused side of absorbing pipe, the vertical height of non-concentrating side.
Fig. 5 show another embodiment of thermal-collecting tube of the present invention.The outer wall of metal heat absorption tube 2 is coated with selective heat-absorbing painting
Layer, coating material is black chrome coating.Metal heat absorption tube 2 and fin body 4 are integrated, the production of metal heat absorption tube 2 and fin body 4
Material uses stainless steel, and fin body 4 uses needle wing, and the needle wing is made up of Tool in Cutting overall processing.In metal tube
Diameter D=40mm.
In the circumferential, needle fin body is distributed only in unilateral half of the circumference of metal heat absorption tube, Section A-A as shown in FIG. 6
On.23 fins are distributed in 180 ° of angular ranges, fin section is rectangle.In axial direction, needle fin body presses rotation direction consistent three
Dimension helix 5 is distributed in metal pipe internal surface, as shown in Figure 5.In the present embodiment, the needle fin body and main flow direction angle
It is 60 °, needle fin body is 0.1D in the optically focused side vertical height of absorbing pipe, and non-concentrating side vertical height is 0.3D.The present embodiment
The screw pitch of the three-dimensional spiral line of selection is 12mm, 6 fin bodies of equidistantly distributed in a screw pitch.Due to the fin interval of distribution
It is smaller, helix screw pitch is smaller, at this point, fin distribution it is more intensive.When heat-transfer fluid flows through the Spiral distribution of needle wing, due to
Non-concentrating side fin height is apparently higher than optically focused side height, and the pressure drag of the side flow passages is apparently higher than optically focused side, generates spiral
While flowing, more fluid is had to the optically focused side of absorbing pipe and draws close flowing.
The arrangement that multiple fin bodies that the present invention is distributed on metal heat absorption tube tube wall use single-sided arrangement, are threadingly advanced
Mode, in conjunction with factors such as flux-density distribution, design temperature and processing costs, optimized fin body, helical curve parameter make fluid
Under the guide functions of fin body, swirl flow is formed, the Secondary Flow as caused by spiral flow promotes the radial mixing of fluid, enhancing
The disturbance of internal flow, improves the heat-transfer effect of inside pipe wall and tube fluid, for gas working medium, defeated
Enter under identical energy-flux density, can effectively reduce the temperature difference of tube wall and gas, improve the safety of evacuated collector tube, realizes efficiently low
The augmentation of heat transfer effect of resistance and energy-saving purpose.
Claims (4)
1. a kind of evacuated collector tube with the semi-circumference unilateral side fin body being threadingly advanced, it is characterised in that: the vacuum collection
Heat pipe is coaxially sequentially arranged outer glass tube (1) from outer to inner and contains the metal heat absorption tube (2) of fin body (4)；The glass
It is vacuum chamber (6) between outer tube (1) and metal heat absorption tube (2), is connected by sealing device, the end setting of outer glass tube (1)
Expansion joint (3)；The outer surface of metal heat absorption tube (2) is coated with selection and absorbs sun light coating, the inner surface of metal heat absorption tube (2)
Equipped with the fin body (4) integrated with metal heat absorption tube.
2. evacuated collector tube according to claim 1, it is characterised in that: the fin body (4) is the discontinuous of needle wing
Wing rib, cross section are rectangle or circle；The fin body is on the inner wall of metal heat absorption tube in vertical or oblique arrangement, with pipe
The tilt angle of main flow direction is within the scope of 60 °~90 °；The height h of the fin body is in the range of 0.05~0.4D, D
For metal bore, height h constant or according to energy-flux density height distribution and it is different: the area high positioned at optically focused side energy-flux density
The height value in domain is less than the height positioned at non-concentrating side energy-flux density low area.
3. evacuated collector tube according to claim 1, it is characterised in that: described fin body (4) single-sided arrangement is in metal
It is equidistant to arrange in the semi-circumference of the inner wall of absorbing pipe；The fin body is parallel to metal heat absorption tube with three-dimensional spiral shape edge
In axial direction or oblique arrangement is advanced；The quantity of fin body, spacing, the screw pitch of helix are according to energy-flux density, design temperature, metal
Pipe caliber and processing cost determine.
4. evacuated collector tube according to claim 3, it is characterised in that: the screw pitch of the helix 5~50mm with
Interior, the spacing of fin along helix arrangement is within 2~10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811588609.XA CN109668328B (en) | 2018-12-25 | 2018-12-25 | Vacuum heat collecting tube with spirally-advancing semi-circumferentially-distributed fin bodies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811588609.XA CN109668328B (en) | 2018-12-25 | 2018-12-25 | Vacuum heat collecting tube with spirally-advancing semi-circumferentially-distributed fin bodies |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109668328A true CN109668328A (en) | 2019-04-23 |
| CN109668328B CN109668328B (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811588609.XA Active CN109668328B (en) | 2018-12-25 | 2018-12-25 | Vacuum heat collecting tube with spirally-advancing semi-circumferentially-distributed fin bodies |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101363664A (en) * | 2008-10-09 | 2009-02-11 | 西安交通大学 | Focussing groove type solar thermal absorber of single side multi-longitudinal whorl strengthened heat exchange |
| CN102425867A (en) * | 2011-11-18 | 2012-04-25 | 中国科学院电工研究所 | Tank type solar vacuum heat collecting tube with one-sided inner fin |
| US20120186575A1 (en) * | 2010-08-02 | 2012-07-26 | Orrin Systems, Inc. | Solar Collector |
| CN102818385A (en) * | 2011-06-11 | 2012-12-12 | 刘建设 | Novel solar heat collecting pipe |
| CN103267377A (en) * | 2013-05-08 | 2013-08-28 | 南京溧马新能源科技有限公司 | Solar vacuum heat-collecting tube with fluid mixer |
| CN104930734A (en) * | 2015-06-26 | 2015-09-23 | 张家港市腾昀能源科技有限公司 | Glass vacuum heat collecting pipe |
| CN105546855A (en) * | 2016-01-29 | 2016-05-04 | 中国华能集团清洁能源技术研究院有限公司 | Reinforced heat transferring large-diameter vacuum heat collecting tube |
| CN105674586A (en) * | 2016-04-08 | 2016-06-15 | 哈尔滨工业大学（威海） | Heat transmission-improvable tubular solar heat absorber with built-in pin fin groups |
-
2018
- 2018-12-25 CN CN201811588609.XA patent/CN109668328B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101363664A (en) * | 2008-10-09 | 2009-02-11 | 西安交通大学 | Focussing groove type solar thermal absorber of single side multi-longitudinal whorl strengthened heat exchange |
| US20120186575A1 (en) * | 2010-08-02 | 2012-07-26 | Orrin Systems, Inc. | Solar Collector |
| CN102818385A (en) * | 2011-06-11 | 2012-12-12 | 刘建设 | Novel solar heat collecting pipe |
| CN102425867A (en) * | 2011-11-18 | 2012-04-25 | 中国科学院电工研究所 | Tank type solar vacuum heat collecting tube with one-sided inner fin |
| CN103267377A (en) * | 2013-05-08 | 2013-08-28 | 南京溧马新能源科技有限公司 | Solar vacuum heat-collecting tube with fluid mixer |
| CN104930734A (en) * | 2015-06-26 | 2015-09-23 | 张家港市腾昀能源科技有限公司 | Glass vacuum heat collecting pipe |
| CN105546855A (en) * | 2016-01-29 | 2016-05-04 | 中国华能集团清洁能源技术研究院有限公司 | Reinforced heat transferring large-diameter vacuum heat collecting tube |
| CN105674586A (en) * | 2016-04-08 | 2016-06-15 | 哈尔滨工业大学（威海） | Heat transmission-improvable tubular solar heat absorber with built-in pin fin groups |
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| CN109668328B (en) | 2020-07-14 |
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