CN107144024A - A kind of solar vacuum heat-collecting pipe and system close to countercurrent flow effect - Google Patents
A kind of solar vacuum heat-collecting pipe and system close to countercurrent flow effect Download PDFInfo
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- CN107144024A CN107144024A CN201710281853.0A CN201710281853A CN107144024A CN 107144024 A CN107144024 A CN 107144024A CN 201710281853 A CN201710281853 A CN 201710281853A CN 107144024 A CN107144024 A CN 107144024A
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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
Abstract
The invention provides a kind of solar vacuum heat-collecting pipe and its system close to countercurrent flow effect, including outer tube and inner tube, inner tube is arranged with the outer tube, vacuum chamber is formed between outer tube and inner tube, heat exchanger tube is provided with said inner tube, phase-change material is filled between said inner tube and heat exchanger tube；The heat exchanger tube includes inlet header, outlet header and the pipe being connected with inlet header and outlet header, and described inlet header is in the inner side of inner tube, and outlet header is in the outside of inner tube.The present invention provides a kind of phase-change heat-storage solar energy vacuum heat collection pipe, inlet header is arranged on into inside, outlet header is arranged on outside so that the form of heat exchange forms the form of the best countercurrent flow of similar heat transfer effect, so as to reach optimal heat transfer effect.
Description
Technical field
The invention belongs to solar energy heat collecting tube technology field, more particularly to a kind of solar energy close to countercurrent flow effect are true
Empty set heat pipe and system.
Background technology
Solar energy has obtained more and more extensive concern serious today as one of energy most cleaned in environmental pollution
And application.Yet with season, the limitation of natural conditions and the rain or shine influence of the Stochastic Weather factor such as sleet, the sun such as round the clock
Dispersiveness is presented and intermittent in irradiation level, and difficulty is added to large-scale application.In order that solar energy turns into the energy of continuous-stable
Source, it is necessary to store sunny solar radiation in the daytime, for night and overcast and rainy is used.Phase change heat storage material utilizes thing
The heat of transformation that matter is produced in phase transition process carries out the storage and utilization of heat, with thermal storage density is high, to store exothermic process near
Like the advantages of isothermal, it can be very good to be applied to storage of solar energy.
The document that can be looked into shows had many experts and scholars to attempt grinding for phase-change heat-storage solar energy heat collector both at home and abroad
System.Such as solar phase-change heat-accumulation heat-collection pipe (application number：200820150741.8) disclose phase change heat storage material and be packaged in sealing
In container, sealing container is placed in solar energy heat collection pipe, and heat transfer medium is filled between solar energy heat collection pipe and sealing container.This
The shortcoming of item technology is higher for spherical sealed container randomness in heat transfer medium, it is difficult to ensure that the temperature and flow of thermal-collecting tube are steady
It is fixed, and complicated structure adds cost of manufacture, reduces service life.Phase change energy-storage type solar vacuum heat-collecting pipe (Shen
Please number：201410024269.3) disclose metal fin layered to be arranged in inwall and be divided into multiple heat transfer spaces, every
Filling phase-change material in individual heat transfer space, U-shaped water pipe is exchanged heat by heat transfer space.The shortcoming of this technology is when phase transformation material
During material overheat, thermal-collecting tube inner high voltage power is difficult to discharge, and causes potential safety hazard.Phase-change heat-storage solar energy vacuum heat collection pipe and its group
Into solar water heater (application number：201510321109.X) disclose in metal inner pipe filled with phase change heat storage material, phase
U heat exchange is embedded with change heat storage material, the entrance point and the port of export of U heat exchange stretch out the openend of metal inner pipe and worn
Closure is crossed to fix.The shortcoming of this technology is that heat exchange area is smaller between simple U heat exchange and phase-change material, heat exchange efficiency
It is relatively low.
The content of the invention
The purpose of the present invention is that there is provided a kind of sun close to countercurrent flow effect to overcome above-mentioned the deficiencies in the prior art
Energy vacuum heat collection pipe, effectively solution Solar use are dispersed, indirect sex chromosome mosaicism, improve phase-change material thermal conductivity factor, raising is changed
The thermal efficiency, safety and stability, the advantages of service life is long.
To achieve the above object, the present invention uses following technical proposals：
It is arranged in a kind of solar vacuum heat-collecting pipe close to countercurrent flow effect, including outer tube and inner tube, the outer tube
There is inner tube, formed between outer tube and inner tube and heat exchanger tube is provided with vacuum chamber, said inner tube, filled between said inner tube and heat exchanger tube
Phase-change material；Characterized in that, the heat exchanger tube includes inlet header, outlet header and is connected with inlet header and outlet header
Logical pipe, described inlet header is in the inner side of inner tube, and outlet header is in the outside of inner tube.
Preferably, the pipe is floating coiled pipe, floating coiled pipe is one or more, and each floating coiled pipe includes many
The tube bank of root circular arc, the center line of the tube bank of many circular arc is the circular arc of concentric circles, and the end of adjacent tube bank passes through header
Connection so that the end of tube bank forms tube bank free end, the tube bank of many circular arcs forms cascaded structure.
Preferably, the concentric circles is the circle using the center line of inner tube as the center of circle.
Preferably, more remote apart from the center of circle, the spacing between described tube bank is smaller.
Preferably, more remote apart from the center of circle, the smaller amplitude of spacing between described tube bank constantly increases.
Preferably, from the center of circle of concentric circles outwards, at least provided with three tube banks, wherein connection n-th is between n+1 roots
Header and connection (n+1)th and the n-th+2 between header be located at different ends, wherein n>=1.
Preferably, the inlet header and outlet header are located at first end, between described connection the 1st and 2
Header is located at the second relative end of first end.
Preferably, the first end of the outer tube is provided with vacuum pumping opening, getter is provided between the outer tube and inner tube,
The getter is corresponding with vacuum pumping opening；
The vacuum pumping opening is in sharp mouth shape.
Preferably, being provided with support member on the outside of the first end of said inner tube, the getter is arranged on support member；
The support member is S-shaped or U-shaped or W shapes.
Preferably, the phase-change material of paraffin and nanometer aluminium powder mixture by being made up.
Preferably, the mass fraction of nanometer aluminium powder is 0.3~0.6% in the mixture.
Preferably, setting the internal diameter of inlet header and outlet header as R, the radius of the circular arc nearest apart from the center of circle is r1,
The internal diameter of inner tube of heat exchanger is r2, and the internal diameter of tube bank is c, and tube pitch is d, meets following relation：
(r2-r1)/d=(R/c)a；Wherein a is coefficient, meets following condition：
1.2<=R/c<=1.5,3.42<=a<=7.60；
1.5<R/c<=1.8,2.36<=a<3.42；
1.8<R/c<=2.1,1.87<=a<2.36.
30mm<r1<40mm；70mm<r2<80mm；100mm<r3<110mm；
5mm<R<15mm。
Preferably, with R/c increase, a numerical value constantly reduces.
A kind of vacuum heat-collecting system, including foregoing vacuum heat collection pipe.
Compared with prior art, the present invention has the advantage that：
1st, the heat exchange efficiency of thermal-collecting tube is enabled to reach maximum by being arranged such.Because flowing is cold flow in tube bank
Body, the temperature of the heat-storing material between inner tube 4 and outer tube 6 is that temperature is more and more lower from outside to inside.Because outside heat-storing material
(i.e. close to outer wall of inner tube) is first by solar energy heating, therefore temperature highest, and internal heat-storing material is because absorb solar energy
It is few, therefore temperature is minimum.Inlet header 31 is arranged on inside, outlet header 32 is arranged on outside so that the form of heat exchange
The form of the best countercurrent flow of similar heat transfer effect is formed, so as to reach optimal heat transfer effect.
2nd, it is combined together first using elastic tube bundle structure as thermal-collecting tube, and by elastic tube bundle and phase-change material, bullet
Property tube bank have good response to phase-change material, can produce larger disturbance, improve heat exchange efficiency, excite shaking for many order frequencies
Dynamic, Energy distribution is more uniform.
3rd, by way of theory analysis, numerical simulation and experimental study, the physical dimension of elastic tube bundle has been carried out excellent
Change so that the structure of elastic tube bundle reaches the vibrating effect of maximum, so as to further disturb phase-change material, improve heat transfer effect.
4th, phase-change material is filled between vacuum tube and thermal-collecting tube, sunny solar radiation in the daytime is stored, for night
Between and it is overcast and rainy use, efficiently solve Solar use dispersiveness, indirect the problem of.
5th, using paraffin and nanometer aluminium powder mixture as phase-change material, keep substantially the latent heat of phase change of paraffin script and
While phase transition temperature, thermal conductivity factor more than 30% is improved.
Brief description of the drawings
Fig. 1 is the structure chart of solar vacuum heat-collecting pipe of the present invention；
Fig. 2 is the sectional view of Section A-A in Fig. 1；
Fig. 3 is the physical dimension schematic diagram in Fig. 2.
Reference is as follows：1- bleeding points, 2- getters, 3- elastic tube bundles, 4- metal inner pipes, 5- selective absorbings are applied
Layer, 6- outer glass tubes, 7- phase-change materials, 8- kovar alloys, 9- bellowss, 10- breathing films, 11- support members, 31- inlet headers,
32- outlet headers, 33- tube banks, 34- headers
Embodiment
The embodiment to the present invention is described in detail below in conjunction with the accompanying drawings.
Herein, if without specified otherwise, being related to formula, "/" represents division, and "×", " * " represent multiplication.
A kind of solar vacuum heat-collecting pipe close to countercurrent flow effect as shown in Figure 1, including outer tube 6 and inner tube 4, institute
State and inner tube 4 is arranged with outer tube 6, formed between outer tube 6 and inner tube 4 and heat exchanger tube is provided with vacuum chamber, said inner tube 4, it is described interior
Phase-change material is filled between pipe 4 and heat exchanger tube；The heat exchanger tube is heat exchange coil 3, and the heat exchange coil is elastic tube bundle coil pipe
3。
Elastic tube bundle 3 is applied in solar thermal collector by the invention, by setting elastic tube bundle so that stream
When body heats flowing in elastic tube bundle, elastic tube bundle is impacted, so as to induce elastic tube bundle to shake, reinforcing is reached
The effect of heat transfer, while the fouling of elastic tube bundle can also be prevented.In outside phase-change material, also constantly melt in heat absorption,
Slowly flowing can be also formed in heating tube, in combination with the vibrations of tube bank, accelerate the flowing of phase-change material, it is further strong
The absorption to solar heat is changed.
Further preferably, described inner tube 4 is metal inner pipe, and described outer tube 6 is outer glass tube.
Further preferably, the structure of described heat exchange coil 3 is as shown in Fig. 2 the heat exchange coil 3 includes inlet header
31st, outlet header 32 and floating coiled pipe 33, floating coiled pipe 33 are connected with inlet header 31 and outlet header 32；Floating coiled pipe 31
For one or more, each floating coiled pipe 31 includes the tube bank of many circular arc, and the center line of the tube bank of many circular arc is
The circular arc of concentric circles, the end of adjacent tube bank is connected by header 34 so that the end of tube bank forms tube bank free end, described many
The tube bank of root circular arc forms cascaded structure.Such as free end B, C, D end in Fig. 2.
Traditional floating coiled pipe is all to carry out vibration scale removal effect using the impact of the flowing of fluid to carry out augmentation of heat transfer, all
To be used for forced-convection heat transfer, and in solar energy heat collection pipe the flowing of fluid using free convection by the way of, and it is of the invention first
Floating coiled pipe is heated applied to solar energy heat collection pipe, it is swollen to produce volume by setting floating coiled pipe, after heating fluid is heated
Swollen, induction floating coiled pipe 3 free end B, C, D produce vibration；And heat-storing material is also constantly melted in endothermic process, store
The flowing of hot material, which gradually forms free convection between thermal-collecting tube inner and outer tubes and then gradually softened, becomes fluid, so as to reach
The purpose of solar energy is absorbed to reinforcing.
Preferably, the concentric circles is the circle using the center line of inner tube 4 as the center of circle.I.e. with the cross section of inner tube 4
The heart is the center of circle.The effect for evenly distributing tube bank is reached by being arranged such to rise.
Preferably, described inlet header 31 is in the inner side of inner tube 4, outlet header 31 is in the outside of inner tube 4.That is import
What collector 31 was connected is the minimum tube bank of caliber, and what outlet header 32 was connected is the maximum tube bank of caliber.
The heat exchange efficiency of thermal-collecting tube is enabled to reach maximum by being arranged such.Because flowing is cold flow in tube bank
Body, the temperature of the heat-storing material between inner tube 4 and outer tube 6 is that temperature is more and more lower from outside to inside.Because outside heat-storing material
(i.e. close to outer wall of inner tube) is first by solar energy heating, therefore temperature highest, and internal heat-storing material is because absorb solar energy
It is few, therefore temperature is minimum.Inlet header 31 is arranged on inside, outlet header 32 is arranged on outside so that the form of heat exchange
The form of the best countercurrent flow of similar heat transfer effect is formed, so as to reach optimal heat transfer effect.
Preferably, from the center of circle of concentric circles outwards, at least provided with three tube banks, wherein connection n-th is between n+1 roots
Header 34 and connection (n+1)th and the n-th+2 between header 34 be located at different ends, wherein n>=1.
For example, as shown in Fig. 2 including 4 tube banks, wherein the 1st tube bank is connected with the 2nd tube bank by header C, the 2nd
Root tube bank is connected with the 3rd tube bank by header B, and the 3rd is connected with the 4th by header D, so that fluid is in four pipes
Cascaded structure is formed in beam.C, D and B end are located at different ends.Wherein B and inlet header 31 and outlet header 32 are located at one
End, C, D are located at the other end.
Preferably, the header positioned at same one end is separate structure.For example, as shown in Fig. 2 being between header C and header D
Separate structure.This point is also the initiative innovative point of the present invention.Existing elastic tube bundle header all connects together
, by separate structure so that tube bank end thoroughly forms free end, further strengthen disturbance, augmentation of heat transfer.
Further preferably, as shown in Fig. 2 the inlet header 31 and outlet header 32 are located at first end, described connection
Header between 1st and 2 is located at the second relative end of first end.
Further preferably, the end of the outer tube 6 is provided with vacuum pumping opening, and air-breathing is provided between the outer tube 6 and inner tube 1
Agent, the getter is corresponding with vacuum pumping opening；
The vacuum pumping opening is in sharp mouth shape.
Preferably, being provided with support member 11 on the outside of the end of said inner tube 4, the getter is arranged on support member 11；
The support member 11 is S-shaped or U-shaped or W shapes.
Preferably, the phase-change material of paraffin and nanometer aluminium powder mixture by being made up.
Preferably, the mass fraction of nanometer aluminium powder is 0.3~0.6% in the mixture.
In a kind of vacuum heat-collecting system, including water tank and thermal-collecting tube, one end insertion water tank of the thermal-collecting tube, the thermal-arrest
Guan it is exactly foregoing vacuum heat collection pipe.
The vibration of elastic tube bundle make it that stable boundary-layer can not be formed in tube surface, so as to be greatly reduced
The thermal conduction resistance of boundary-layer.In addition, bundle vibration strengthens the disturbance to surrounding fluid, the mixing of cold fluid and hot fluid is strong, stream
Thermal-convection resistance between body is also effectively reduced.So, from Flow-induced vibration for the outer heat convection thermal resistance of reduction pipe to strong
Change heat transfer extremely advantageous.With conventional intensified heat transfer method ratio, the augmentation of heat transfer of elastic tube bundle has its distinctive feature.Such as fin
Pipe, spiral grooved tube, rough surface, bellows tube, plasma-treated surface and other augmentation of heat transfer pipes, the heat-transfer capability of clean surface
It is relatively strong, and heat-transfer capability drastically declines after heating surface fouling.And elastic tube bundle maintains certain frequency under the induction of fluid all the time
Vibrated under rate, amplitude.Streaming, enhancing heat transfer near tube surface is so not only strengthened, and it is attached to reduce dirt
The probability.Research it has also been found that, bundle vibration can be analyzed to freely stretching in face, the two kinds of components that fluctuate outside face.
Freely stretching in face can also make the dirt rapid deterioration of attachment.Therefore, elastic tube bundle is caused with its superior enhanced fouling resistance
It has good compound intensified heat-transfer effect.
The calculation formula of the Nu numbers of plane elasticity pipe bundle heat exchanger is：
The calculation formula of the Nu numbers of plane Fixed Tube-sheet Reboiler heat exchanger is：
In formula, PrfTo use fluid mean temperature for the Prandtl number of qualitative temperature, PrwTo use wall surface temperature to be qualitative
The Prandtl number of temperature, Re is fluid Reynolds number.
Measured through experiment, the mean heat transfer coefficient of clean surface elastic tube bundle heat exchanger improves 200% than Fixed Tube-sheet Reboiler, with
Other kinds of heat exchanger is compared, and the effect of elastic tube bundle augmentation of heat transfer under low flowing Reynolds number is clearly.
Because plane elasticity tube bank import and export are considered as ideal constraint, elastic tube bundle vibration is set up using the direct rigidity addition method
Equation：
In formula, m is oeverall quality battle array, and c is tube fluid flow velocity, and G is that Corrioli's effect damps battle array, kpFor tube bank Stiffness Matrix, kfFor
Fluid dynamic energy Stiffness Matrix, q is fluid modal displacement.
Under Flow-induced vibration effect, tube bundle vibration shows the other varies with sinusoidal function of submillimeter level, direction of vibration
Tube bank horizontal plane is directed predominantly perpendicular to, with the increase of inlet flow rate, vibration amplitude is incrementally increased, and vibration frequency keeps constant.
Plane elasticity bundle vibration unstability limit velocity between 3.3565~3.3569m/s, solar thermal collector of the invention because
For the state in free convection or access expansion convection current, velocity in pipes during real work is much smaller than the limit velocity.
By theory analysis, numerical simulation and it was found that, inlet header, the internal diameter of outlet header, tube bank internal diameter,
The data of tube pitch can not be excessive or too small, it is excessive or it is too small can all influence the vibration frequency of elastic tube bundle, cause vibrations
Effect is deteriorated, so as to influence heat exchange.
Invention further contemplates the concrete structure size for the thermal-collecting tube for reaching maximum vibration state.Specific result of study
It is to first pass through theory analysis and numerical simulation, is then verified by testing, so as to obtains the knot of the vibrating effect of maximum
Structure size relationship formula.
Preferably, setting the internal diameter of inlet header and outlet header as R, the radius of the circular arc nearest apart from the center of circle is r1,
The internal diameter of inner tube of heat exchanger is r2, and the internal diameter of tube bank is c, and tube pitch is d, meets following relation：
(r2-r1)/d=(R/c)a；Wherein a is coefficient, meets following condition：
1.2<=R/c<=1.5,3.42<=a<=7.60；
1.5<R/c<=1.8,2.36<=a<3.42；
1.8<R/c<=2.1,1.87<=a<2.36.
30mm<r1<40mm；70mm<r2<80mm；100mm<r3<110mm；
5mm<R<15mm；
The radius of tube bank is preferably 3-10mm；
Distance is preferably 10-20mm between tube bank.
Preferably, the material of the coil pipe is copper alloy, cupric is 62%~68%.
Above-mentioned empirical equation is verified by substantial amounts of.In the case where meeting above-mentioned empirical equation, change
The vibrating effect of hot coil reaches most preferably.By above-mentioned empirical equation, also the design for solar energy heat collection pipe provide one it is excellent
The design formula of change.
Preferably, with R/c increase, a numerical value constantly reduces.
Preferably, the quantity of tube bank is 3-5 roots, preferably 3 or 4.
As shown in figure 3, described inlet header and the extended line of the line in the center of circle of outlet header pass through heat collector inner tube
The center of circle.
Preferably, with one end header and the center of circle of the line Jing Guo heat collector inner tube of the tie point of tube bank.
Preferably, the header at the line in the center of circle of the inlet header and outlet header and the second end and the connection of tube bank
The angle b of the line formation of point is 50-70 degree (angle).More preferably 55-65 degree (angle).
Preferably, more remote apart from the center of circle, the spacing between described tube bank is smaller.
Further preferably, more remote apart from the center of circle, the smaller amplitude of spacing between described tube bank constantly increases.
By it is theoretical and experimental studies have found that, main cause is as follows：1) because the accumulation of heat material more remote, described apart from the center of circle
Material temperature degree is higher.By reducing the spacing between tube bank so that more remote apart from the center of circle, the quantity of the tube bank of distribution is more.Tube bank
Increase so that the free end of elastic tube bundle is also with more remote apart from the center of circle, and distributed number is also more, therefore the vibration region of tube bank
It is bigger so that heat transfer effect is strengthened in the high region of temperature, improves overall heat transfer effect.
2) with more remote apart from the center of circle, quantity is more, then endotherm area is bigger, and heat absorption capacity is stronger.
3) as the bigger exchange capability of heat of distance apart from the center of circle is stronger, then the heat transfer process of heat-exchanging tube bundle is increasingly connect
The countercurrent flow of nearly shell-and-tube heat exchanger, further strengthens heat transfer effect.
It is found through experiments that, takes the spacing change between tube bank, more than 10% heat transfer effect can be improved.
Further preferably, preferably, more remote apart from the center of circle, the internal diameter of described tube bank is less and less.
Further preferably, more remote apart from the center of circle, the smaller amplitude of spacing between described tube bank constantly increases.
Main cause is as follows：1) because more remote apart from the center of circle, described heat-storing material temperature is higher.Become by restraining internal diameter
Change, increase the vibration frequency of tube bank, because pipe with small pipe diameter is easier vibrations.Restrain vibration frequency increase so that the high region of temperature
Strengthen heat transfer effect, improve overall heat transfer effect.
2) as the distance apart from the center of circle is gone back more greatly, heat energy power is stronger, then the heat transfer process of heat-exchanging tube bundle is increasingly connect
The countercurrent flow of nearly shell-and-tube heat exchanger, further strengthens heat transfer effect.
It is found through experiments that, takes the spacing change between tube bank, more than 12% heat transfer effect can be improved.
As depicted in figs. 1 and 2, a kind of phase change heat storage type solar vacuum heat-collecting pipe is by bleeding point 1, getter for overall structure
2nd, elastic tube bundle 3, metal inner pipe 4, coating for selective absorption 5, outer glass tube 6, phase-change material 7, kovar alloy 8, bellows 9,
Breathing film 10 and support member 11 are constituted, and outer glass tube 6 constitutes U-shaped sleeve pipe with metal inner pipe 4, and outer glass tube 6 uses Pyrex glass
Glass, metal inner pipe 4 uses stainless steel material, and the two one end sealing, the other end passes through the transition sealing of kovar alloy 8.To solve gold
The skimble-scamble problem of linear expansion coefficient between category and glass, is carried out between metal inner pipe 4 and outer glass tube 6 using bellows 9
Expansion compensation, is made using gapless stainless steel tube.The sealed end of outer glass tube 6 is provided with vacuum pumping opening 1.On the outer wall of metal inner pipe 4
Coating for selective absorption 5 is scribbled, the sealed end inwall of outer glass tube 6 scribbles breathing film 10.Between outer glass tube 6 and metal inner pipe 4
Vacuumize and be provided with support member 11 and getter 2.Phase-change material 7 is filled between metal inner pipe 4 and elastic tube bundle 3, phase-change material 7 is adopted
With paraffin and nanometer aluminium powder mixture, wherein nanometer aluminium powder mass fraction is 0.3~0.6%.
Although the present invention is disclosed as above with preferred embodiment, the present invention is not limited to this.Any art technology
Personnel, without departing from the spirit and scope of the present invention, can make various changes or modifications, therefore protection scope of the present invention should
It is defined when by claim limited range.
Claims (10)
1. it is arranged with a kind of solar vacuum heat-collecting pipe close to countercurrent flow effect, including outer tube and inner tube, the outer tube
Inner tube, forms between outer tube and inner tube and heat exchanger tube is provided with vacuum chamber, said inner tube, phase is filled between said inner tube and heat exchanger tube
Become material；Characterized in that, the heat exchanger tube includes inlet header, outlet header and is connected with inlet header and outlet header
Pipe, described inlet header is in the inner side of inner tube, and outlet header is in the outside of inner tube.
2. solar vacuum heat-collecting pipe as claimed in claim 1, it is characterised in that the pipe is floating coiled pipe, floating disc
Manage for one or more, each floating coiled pipe includes the tube bank of many circular arc, and the center line of the tube bank of many circular arc is
The circular arc of concentric circles, the end of adjacent tube bank is connected by header so that the end of tube bank forms tube bank free end, described many
The tube bank of circular arc forms cascaded structure.
3. solar vacuum heat-collecting pipe as claimed in claim 1, it is characterised in that the concentric circles is the center line with inner tube
For the circle in the center of circle.
4. solar vacuum heat-collecting pipe as claimed in claim 3, it is characterised in that more remote apart from the center of circle, described tube bank it
Between spacing it is smaller.
5. solar vacuum heat-collecting pipe as claimed in claim 4, it is characterised in that more remote apart from the center of circle, described tube bank it
Between the smaller amplitude of spacing constantly increase.
6. solar vacuum heat-collecting pipe as claimed in claim 2, it is characterised in that from the center of circle of concentric circles outwards, at least set
Three tube banks are put, wherein the header between header and connection (n+1)th and the n-th+2 of the connection n-th between n+1 roots is located at
Different ends, wherein n>=1.
7. thermal-collecting tube as claimed in claim 6, it is characterized in that, if the internal diameter of inlet header and outlet header is R, apart from the center of circle
The radius of nearest circular arc is r1, and the internal diameter of inner tube of heat exchanger is r2, and the internal diameter of tube bank is c, and tube pitch is d, meets such as ShiShimonoseki
System：
(r2-r1)/d=(R/c)a；Wherein a is coefficient, meets following condition：
1.2<=R/c<=1.5,3.42<=a<=7.60；
1.5<R/c<=1.8,2.36<=a<3.42；
1.8<R/c<=2.1,1.87<=a<2.36；
30mm<r1<40mm；70mm<r2<80mm；100mm<r3<110mm；
5mm<R<15mm；
With R/c increase, a numerical value constantly reduces.
8. thermal-collecting tube as claimed in claim 1, it is characterized in that, the first end of the outer tube is provided with vacuum pumping opening, described outer
Getter is provided between pipe and inner tube, the getter is corresponding with vacuum pumping opening；
The vacuum pumping opening is in sharp mouth shape.
9. thermal-collecting tube as claimed in claim 1, it is characterized in that, support member, the suction are provided with the outside of the first end of said inner tube
Gas agent is arranged on support member；
The support member is S-shaped or U-shaped or W shapes.
10. a kind of vacuum heat-collecting system, it is characterized in that, including at least one the vacuum collection as described in claim any one of 1-9
Heat pipe.
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| CN201710281853.0A CN107144024B (en) | 2017-04-26 | 2017-04-26 | A kind of solar vacuum heat-collecting pipe and system close to countercurrent flow effect |
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| CN109990504A (en) * | 2019-04-09 | 2019-07-09 | 山东大学 | A kind of spiral wound tube type heat exchanger and deep-well therrmodynamic system |
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| CN110174020A (en) * | 2019-05-28 | 2019-08-27 | 山东大学 | A kind of heat exchanger of unsymmetrical arrangement |
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