CN102538544A

CN102538544A - Compound heat pipe, method of manufacturing the same, heat exchanger and heat exchanger system using the same

Info

Publication number: CN102538544A
Application number: CN201110458359XA
Authority: CN
Inventors: 金吉泳; 朴一权; 李亨准
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 2010-12-24
Filing date: 2011-12-23
Publication date: 2012-07-04
Anticipated expiration: 2031-12-23
Also published as: KR101200597B1; KR20120072887A; US20120160457A1; CN102538544B

Abstract

The compound heat pipe according to the present invention may overcome physical limits, which a single metal pipe might have, by integrally joining different metal pipes having different physical properties, forming ridges on an inner surface thereof the pipe and protrusions on an outer surface thereof and may first increase heat transfer capability by increasing the heat transfer area between the pipe and fluid. Further, the compound heat pipe according to the present invention may secondly increase the heat transfer capability by setting the noncontact rate to be 30% or less so that the heat transfer rate of the compound heat pipe in the radial direction may be optimized.

Description

Complex heat transfer pipe and manufacturing approach thereof, heat exchanger and heat-exchange system

Technical field

The present invention relates to a kind of heat-transfer pipe that is used in heat exchanger, particularly a kind of complex heat transfer pipe that is composited by metal material with different each other physical characteristics.

Background technology

Usually, industrial equipment, changes in temperature equipment, various mechanical devices etc. possess the heat-exchange system that is used to carry out heat exchange action.The heat-transfer pipe that in this heat-exchange system, is widely used is used metal tube as heat exchange.For example, utilizing the liquid solubility with temperature of refrigerant vapour, pressure and in the absorber and evaporimeter of the Absorption Refrigerator of different principle, between cooling water and the absorption liquid and the heat exchange between cold water and the cold-producing medium and use heat-transfer pipe.And, in the evaporimeter of turborefrigerator, also use heat-transfer pipe for the heat exchange of cold water and cold-producing medium (R134a).

Early stage heat-transfer pipe only is made up of single metal (for example copper or copper alloy), in order to improve heat exchange performance, forms projection or metal fin etc. at the exterior face of heat-transfer pipe.For example, the various schemes that improve the heat exchange performance of heat-transfer pipe by single metal being used to of constituting have been introduced in No. the 0518695th, korean granted patent, No. the 0707682nd, korean granted patent, Korea S's publication 2007-63073 number, Korea S's publication 2009-98526 number and Korea S's publication 2010-21215 number etc.

Representational method is, forms thermofin or projection at the exterior face of heat-transfer pipe, and forms the ridge projections or the thread-shaped projection of coiling shape in inside face.

But when like this only constituting heat-transfer pipe by copper or copper alloy, the inherent characteristic that is had owing to copper or copper alloy itself produces variety of issue.Though copper or copper alloy have remarkable corrosion resistance, outstanding heat conductivity and various outstanding mechanical property, have owing to be not rich in natural resources, thereby price is high, and because the proportion height, thereby the shortcoming of Heavy Weight.And aluminum or aluminum alloy has because of the aboundresources cost is cheap, and the advantage of light weight, and therefore, aluminum or aluminum alloy rises to first substitution material into copper.But the grade of the intensity of aluminum or aluminum alloy, corrosion resistance, heat conductivity and other inferior mechanical properties all is lower than copper.

Therefore, the composite metal pipe of this copper and aluminium has appearred being suitable for simultaneously recently.For example, Korea S's publication 2009-23349 number (below abbreviate patent documentation 1 as) interior metal layer of having proposed a kind of pipe is made up of copper/aluminium composite pipe that the outer metal layer of pipe is made up of aluminium copper.

And; In order to improve heat transfer property like the multiple tube of above-mentioned patent documentation 1; Patent documentation 2 (Japanese publication 2000-146304 number) publicity a kind of surface of externally metal level form the heat-transfer pipe of the protruding finned tube form of a plurality of fins (fin); Patent documentation 3 (japanese kokai publication hei 6-198376 number) publicity a kind of integrally formed helical form fin of outer peripheral face of externally metal level, on this helical form fin, form the heat-transfer pipe of many slits with spiral form.

But, with regard to above-mentioned patent documentation 2 and patent documentation 3, owing to only be formed for promoting the thermofin of heat transfer property on the surface of the outer metal layer of complex heat transfer pipe, so the expansion of heat transfer property is limited.

Therefore, structural change be need carry out, the flow resistance that can enlarge heat transfer area, increase convection cell, the ridge projections (ridge) that obtains the warm current effect also formed like medial surface at heat-transfer pipe.

So, if, also form ridge projections, then as shown in Figure 1 in the boundary face 13 a plurality of slits of generation (gap) 14 of interior metal layer 11 with outer metal layer 12 in inside face not only at the exterior face of complex heat transfer pipe.The existence in this slit causes the heat-conductive characteristic between the fluid of the internal flow of heat-transfer pipe and the fluid in the flows outside of heat-transfer pipe to descend.The size in the slit that therefore, exists on the boundary face of the interior metal layer of control complex heat transfer pipe and outer metal layer is extremely important for the heat transfer property that improves the complex heat transfer pipe.The inventor is from such technical background, and the correlation between the pyroconductivity of the size (noncontact rate) in the slit that exists at the complex heat transfer pipe and complex heat transfer pipe is studied.

Result of study learns that there is inversely prroportional relationship in the boundary face noncontact rate of the pyroconductivity of complex heat transfer pipe and complex heat transfer pipe, and near pyroconductivity rapid variation specific noncontact rate.

Summary of the invention

The present invention derives from so technological motivation and background; First technical task of the present invention is; Formation is by the overlapping complex heat transfer pipe of two two or more heavy metals, and not only changes the exterior face of complex heat transfer pipe, and the surface texture that also changes inside face is realized the maximization of heat transfer property.

And second technical task of the present invention is that the noncontact rate that is adjusted in the interior metal layer of complex heat transfer pipe and the boundary face existence that outer metal layer is joined realizes the pyroconductivity optimization of the radial direction of complex heat transfer pipe.

Other purposes of the present invention and advantage will be described below, and can understand through embodiments of the invention.And the object of the invention and advantage can realize through the structure described in the claim scope and the combination of structure.

In order to reach above-mentioned purpose, of the present invention a kind of complex heat transfer pipe is provided, it is characterized in that,

Comprise: first body, it is made up of first metal material, is formed with a plurality of projections at its outer surface; Second body; Its insertion is bonded on the inboard of above-mentioned first body, is made up of second metal material with physical characteristic different with above-mentioned first metal material, and side surface is formed with a plurality of ridge projections within it; And boundary face, it is joined by above-mentioned first body and above-mentioned second body and forms;

Satisfy below 30% by noncontact rate following mathematical expression definition, that cause in the slit (gap) that above-mentioned boundary face exists,

Here, L is illustrated in the arc length summation in the slit that the boundary face of complex heat transfer pipe exists, the radius of r ' expression boundary face.

At this moment, above-mentioned first metal material is the alloy of any or they among Al and the Cu, and above-mentioned second metal material is the alloy of any or they among Cu, Ti and the SUS.

According to the present invention, owing to insert to engage double metal tube, therefore can overcome the limitation of the physical characteristic that single metal has with mutually different physical characteristic.

And, not only form protuberance at the exterior face of complex heat transfer pipe, also form ridge projections, thereby be increased in the maximization that heat transfer property is realized in the inside and outside of complex heat transfer pipe and area that fluid joins and fluid resistance in inside face.

And, suitably control the noncontact rate that the slit that produces on the outer metal layer of complex heat transfer pipe and the boundary face that the interior metal layer joins causes, thereby realize the optimization of radial (radial) pyroconductivity of complex heat transfer pipe.

Therefore; Complex heat transfer pipe according to the present invention is compared with the single heat-transfer pipe that only is made up of copper or copper alloy; Advantage with the low and light weight of cost is compared with the single heat-transfer pipe that only is made up of aluminum or aluminum alloy simultaneously, has outstanding corrosion resistance and outstanding conductibility.And, to compare with existing complex heat transfer pipe, the heat transfer property of complex heat transfer pipe of the present invention is preeminent.

Description of drawings

The accompanying drawing of this specification is illustration the preferred embodiments of the present invention; Together play a part to help further to understand technological thought of the present invention with the described detailed description of the present invention in back, so the present invention can not be interpreted as and only is defined in the item of putting down in writing in these accompanying drawings.

Fig. 1 is the cross-sectional view that a plurality of slits of the externally existence of the boundary face between metal level and the interior metal layer is amplified the complex heat transfer pipe of expression.

Fig. 2 is the longitudinal section of complex heat transfer pipe of the present invention.

Fig. 3 is the enlarged drawing of the boundary face of complex heat transfer pipe.

Fig. 4 is the figure that is used to explain the noncontact rate of complex heat transfer pipe.

Fig. 5 is the figure that is used for being calculated by complex heat transfer pipe sample the average arc length summation in slit.

Fig. 6 is the chart that shows the relation of noncontact rate and pyroconductivity.

The specific embodiment

Below, with preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.Before this; Employed term or word can not be defined in common explanation or dictionary explanation in this specification and claim scope; But to be based on the inventor can suitably define the notion of term in order with most preferred method the invention of oneself to be described principle, be interpreted as the implication and the notion of technological thought according to the invention.

Therefore; Embodiment that is put down in writing in this manual and structure illustrated in the accompanying drawings be a most preferred embodiment of the present invention only; Do not represent all technological thoughts of the present invention, therefore be to be understood that to proposing in the application constantly also possibly exist to substitute various be equal to alternative and variation of the present invention.

At first, before explanation structure of the present invention, a plurality of new terminologies that occur in this specification are defined.

" complex heat transfer pipe " expression that occurs in this manual engages plural metal tube and the multiple tube of formation.At this moment, the metal material that is bonded with each other be selected from can the metal material of complementary physical vulnerabilities each other in.

The boundary face that " noncontact rate " expression is joined owing to outer metal layer and interior metal layer at the complex heat transfer pipe exists the slit to cause the degree that outer metal layer and interior metal layer heat are isolated, and it is by following mathematical expression 1 definition.

Mathematical expression 1

Here, above-mentioned L is illustrated in the arc length summation in the slit of boundary face existence, the radius of r ' expression boundary face.

" heat exchanger " is used with following implication: " heat exchanger " is to adopt the complex heat transfer pipe and through realize the general designation of all devices of heat exchange via the fluid of the internal flow of complex heat transfer pipe and the heat transmission between the fluid of the flows outside of complex heat transfer pipe.The example of heat exchanger of the present invention can be enumerated the example such as evaporimeter, heat-pump-type heat exchanger, fin tube type heat exchanger of absorber or the evaporimeter or the turborefrigerator of Absorption Refrigerator.

And heat-exchange system is to use above-mentioned heat exchanger in industrial equipment, changes in temperature equipment, various mechanical devices etc., to carry out the system of heat exchange action, typically, can enumerate examples such as Absorption Refrigerator or turborefrigerator.

And " body " that use in this manual is meant in order to have carried out the pipe of Physical Processing through the inner space transporting fluid.

With reference to Fig. 2, complex heat transfer pipe 20 of the present invention is double pipes that first body 22 and second body 21 combine.Above-mentioned second body 21 inserts the inboard that is bonded on above-mentioned first body 22, forms boundary face 23 in the place that first and

second body

22,21 joins.Under the ideal situation, above-mentioned first and

second body

22,21 should be combined closely each other and avoided in above-mentioned boundary face 23 generation slits.But, after making first body 22 and second body 21 respectively separately, carry out eliminating fully on the operation of physical engagement in slit that boundary face 23 produces and be not easy.

Above-mentioned first body 22 is made up of the double metal material with mutually different physical characteristic with above-mentioned second body 21.The metal material that constitutes above-mentioned first body 22 is formed by being selected from Al or its alloy, Cu or its alloy and their alloy any, and the metal material that constitutes above-mentioned second body 21 is made up of in Cu or its alloy, Ti or its alloy, SUS or its alloy and their alloy any.

Be formed with the surface area contacted a plurality of projections 25 that are used to increase with fluid at the lateral surface of above-mentioned first body 22.Therefore, be preferably the rigidity that first body 22 has 60～130Gpa (Young ' sModulus: Young's modulus) so that form projection 25.If the rigidity of first body 22 less than 60Gpa, then need form predetermined angular at fin and tube surface when generating outside fin, with the lifting heat transfer property, but this is difficult to carry out.And, if the rigidity of above-mentioned first body 22 greater than 130Gpa, then is difficult to form smoothly projection.

Above-mentioned lateral surface at first body 22 forms the concrete operation of projection and can therefore omit with reference to Korea S's publication 2007-63073 number, No. the 0518695th, korean granted patent, No. the 707682nd, korean granted patent and Korea S's publication 2009-98526 number etc.

And, be formed with the surface area contacted a plurality of ridge projections (ridge) 24 that are used to increase with the fluid of internal flow at the medial surface of above-mentioned second body 21.Therefore, be preferably the rigidity (Young ' s Modulus) that second body 21 has 100～200Gpa, so that form ridge projections 24.If the rigidity of second body 21 is less than 100Gpa, then cross and softly be difficult to produce required form because of material, if greater than 200Gpa, then be difficult to form smoothly ridge projections.

Therefore the concrete operation that forms ridge projections at the medial surface of above-mentioned second body 21 can be omitted with reference to Korea S's publication 2007-63073 number, No. the 0518695th, korean granted patent, No. the 707682nd, korean granted patent and Korea S's publication 2009-98526 number etc.

Like this; Through forming projection and ridge projections respectively at the lateral surface of first body 22 of complex heat transfer pipe 20 and the medial surface of second body 21; Heat transfer area between first and

second body

22,21 and the fluid is enlarged; Thereby compare with the existing complex heat transfer pipe of publicity in above-mentioned patent documentation 1 to the patent documentation 3, the heat that can significantly increase heat-transfer pipe is passed on efficient.

And with reference to Fig. 2, the same complex heat transfer pipe 20 of the present invention that forms as being engaged by different each other double metal tubes produces a plurality of slits 30 in the boundary face 23 that double metal tube engages.

Fig. 3 amplifies 1000 times enlarged drawing through microscope with above-mentioned slit 30.With reference to Fig. 3, this slit 30 is that the arc length in slit is l ' along the indefinite form slit of the circumference prolongation of boundary face 23, and straight length is l, and the width of radial direction is d.Above-mentioned arc length l ' and above-mentioned straight length l are much at one.And the width d of above-mentioned radial direction is about 1～10 μ m, and is little of the degree that can ignore than above-mentioned arc length l ' or above-mentioned straight length l.

As stated; Because the slit 30 of the boundary face 23 of complex heat transfer pipe is to carry out the gap that physics produces in the process that expander engages second body 21 being inserted into first body 22, therefore has the indefinite form shape of slit of the very narrow length of the width of radial direction.Therefore, the width d of the radial direction in above-mentioned slit 30 is little of ignoring the influence of passing on performance to cause to the heat of the wide radial direction of complex heat transfer pipe.On the contrary, the arc length l ' in slit 30, promptly straight length l passes on performance to make a big impact to the heat of radial direction.

Therefore, the inventor passes on performance (being pyroconductivity) and the relation between the arc length in the slit of boundary face 23 existence of complex heat transfer pipe to do the modeling of following mathematical expression 1 to the heat of the radial direction of complex heat transfer pipe.

The existence in the slit of the boundary face that the pyroconductivity to the complex heat transfer pipe impacts at first, has been described through the noncontact rate.Above-mentioned noncontact rate representes that first body 22 and second body 21 do not have physics and/or hot joining to close and the degree of isolating.Therefore, above-mentioned noncontact rate high expression first body 22 and second body, 21 heat are isolated very big state, and the pyroconductivity of radial direction descends in the nature of things.

With reference to Fig. 4, be that the boundary face 23 of the complex heat transfer pipe 20 of r ' exists a plurality of slit G at radius ₁～G ₆, the straight length corresponding with the arc length l ' in above-mentioned a plurality of slits is defined as l respectively ₁～l ₆At this moment, the mathematical expression 1 below noncontact rate (%) satisfies.

(mathematical expression 1)

If the boundary face at the complex heat transfer pipe as shown in Figure 4 always co-exists in 6 slits, the L of then above-mentioned mathematical expression 1 satisfies following formula.

L＝l ₁+l ₂+l ₃+l ₄+l ₅+l ₆

At this moment, because the arc length l ' in slit is identical with the straight length l in slit, therefore do not distinguish.

It is true as follows that the inventor gets cicada: roughly be in inversely prroportional relationship by the noncontact rate (%) of above-mentioned mathematical expression 1 definition and the radial pyroconductivity of complex heat transfer pipe, and pyroconductivity takes place sharply to change in specific noncontact rate.That is, get the cicada pyroconductivity and the fact jumpy takes place in above-mentioned noncontact rate (%) 30% front and back.

Therefore, complex heat transfer pipe of the present invention is characterised in that its noncontact rate is below 30%.If the noncontact rate of complex heat transfer pipe greater than 30%, because pyroconductivity becomes below the 7000W/m2K, is not preferred therefore then.And though the lower limit of noncontact rate does not receive special restriction, owing to can not get negative value, so the noncontact rate is 0 ideal.

Now, as the example shows of complex heat transfer pipe the double metal tube that forms by two metal bond with mutually different physical characteristic, but the present invention might not be defined in above-mentioned example.Therefore, in the scope of not damaging basic fundamental thought of the present invention, triple or quadruple metal tube etc. also can become one of embodiment of complex heat transfer pipe of the present invention.

Next, the manufacturing approach that explanation is had the complex heat transfer pipe of the present invention of said structure.

At first, prepare first body 22 usefulness, first metal tube and second body 21 and use second metal tube.Then, second metal tube is inserted into the inner space of first metal tube.Heat under the state in second metal tube is inserted in first metal tube, form the ductility state, through make the naked pipe (Bare Tube) of external diameter via the die process of mould with required form with specified diameter.When making above-mentioned naked pipe, decision is in the size and the level in the slit that boundary face exists.Put into the chipware of (helix) form that has spiral in the inside of so making the naked pipe that forms, give in the outside of naked pipe under the state of three rollers location that are used to form projection, draw naked pipe in the time of with fixing speed rotation naked pipe.Thus, in the spiral helicine ridge projections of the inside face generation of the naked pipe form identical, form the shape of a plurality of shape for lugs at the exterior face of above-mentioned naked pipe with the shape of above-mentioned chipware.So, accomplish the complex heat transfer pipe that constitutes by first body 22 and second body as shown in Figure 2.

Below, will be through the noncontact rate (%) of description of test complex heat transfer pipe and the correlation between the pyroconductivity.

1. the manufacturing of complex heat transfer pipe sample

Copper pipe and the external diameter of preparing external diameter and be 19.05mm and thickness and be 0.5mm are that 21.5mm and thickness are the aluminum pipe of 1mm.After penetrating into ready copper pipe insertion in the aluminum pipe, make naked pipe through the expander operation.The naked pipe that manufacturing like this is formed is carried out the medial surface ridge projections simultaneously and is formed operation and accomplish a plurality of complex heat transfer pipe samples with lateral surface projection formation operation.The quantity that plus-pressure when plus-pressure during at this moment, through change expander operation or adjusting ridge projections or projection form operation waits the slit that is adjusted in boundary face formation is with big or small.After making the quantity and the complex heat transfer pipe sample after the size in 11 adjusting like this slits, respectively it is measured noncontact rate and pyroconductivity.

2. the calculating of noncontact rate (%)

As shown in Figure 5; The complex heat transfer pipe sample that forms for manufacturing; After cutting central part and two terminal parts respectively, measure the straight length of all slits (gap) with the boundary face of SEM (Scanning Electron Microscope, SEM) observation post cutting.The whole phases of the straight length in the slit that so determines Calais is calculated the arc length summation L in the slit of central part and two terminal parts ₁, L ₂, L ₃The arc length summation in the central part that utilization so calculates and the slit of two terminal parts calculates mean value L _Avg, its substitution mathematical expression 1 is obtained noncontact rate (%).At this moment, in order to measure more accurately, also can get the above cutting part in three places (central part and two terminal parts).

3. the mensuration of pyroconductivity

Pyroconductivity is calculated with the overall heat-transfer coefficient that is defined as U (Overall Heat-transfer coefficient).Utilize the heat exchanger experimental provision that can cause the cold-producing medium environment identical with refrigeration machine for this reason.Determine the saturation temperature of carrying out the cold-producing medium of heat exchange in heat exchanger experimental provision inside, carry out the gateway temperature of the water of heat exchange, calculate heat Q based on this with cold-producing medium.Reach log-mean temperature difference Δ T through the heat that will so calculate, the surface area A of heat-transfer pipe with following formula (1) _LMTDObtain total heat in the substitution formula (2) and pass on coefficient U.

{ΔT}_{LMTD} = \frac{{ΔT}_{1} - {ΔT}_{2}}{\ln ({ΔT}_{1} / T_{2})} - - - (1)

U = \frac{Q}{{AΔT}_{LMTD}} - - - (2)

Here, Q representes that cold-producing medium and water carry out the heat (kW) of mutual heat exchange, Δ T ₁Expression cooling water inlet temperature (condenser pipe) or cold water inlet temperature (evaporation tube), Δ T ₂Expression cooling water outlet temperature (condenser pipe) or cold water outlet temperature (evaporation tube), Δ T _LMTDExpression log-mean temperature difference (LMTD:Log Mean Temperature Difference), A representes the surface area of heat-transfer pipe.

4. the correlation of noncontact rate and pyroconductivity

The noncontact rate of 11 complex heat transfer pipe samples that calculate according to the method described above and the arrangement result such as the following table 1 of pyroconductivity.

(table 1)

Noncontact rate (%)	Pyroconductivity (W/m ²k)
		0.0	7923
5.0	7815
		10.4	7753
14.8	7503
		20.1	7214
25.3	7167
		30.3	6926
35.2	5279
		40.7	3561
44.9	2938
		51.6	1750

Result with above-mentioned table 1 is the basis, correlation such as Fig. 6 of noncontact rate that presents in diagrammatic form (%) and pyroconductivity.

With reference to Fig. 6, the noncontact rate of complex heat transfer pipe is 0 o'clock, demonstrates the pyroconductivity of best radiation direction.But along with the increase of the noncontact rate of complex heat transfer pipe, pyroconductivity is with slope S ₁Reduce gradually, (%) reaches for 30% moment in the noncontact rate, and pyroconductivity is with slope S ₂Sharply reduce.That is, can confirm that it is that flex point is interval that noncontact rate (%) reaches 30% place.

Therefore can confirm; When making the complex heat transfer pipe; If plus-pressure, ridge projections when suitably regulating thickness, first body and the second body expander of first body and second body form or the pressure of projection when forming waits noncontact rate (%) is designed to below 30%, just can realize the optimization of the pyroconductivity of complex heat transfer pipe.

The noncontact rate of compound heat transfer tube can be designed to 5.0%～25.3%.

Compound heat transfer tube of the present invention can be applicable to that the absorber of Absorption Refrigerator or the evaporimeter of evaporimeter or turborefrigerator etc. utilize all heat exchangers of heat-transfer pipe.And, can make up heat-exchange system at use heat exchangers of the present invention such as industrial equipment, changes in temperature equipment, various mechanical devices.Typically, can enumerate examples such as Absorption Refrigerator or turborefrigerator.

So; The double metal tube that complex heat transfer pipe of the present invention will have a mutually different physical characteristic engage realize integrated after; Form ridge projections at medial surface; Form projection at lateral surface, thereby overcome the physics limitation that single metal tube has, and the heat transfer area of increase and fluid promotes heat transfer property.And the noncontact rate of setting the complex heat transfer pipe is 30% to realize the optimization of the radial pyroconductivity of complex heat transfer pipe to get off, thereby further promotes the heat transfer property of complex heat transfer pipe.

As stated; Embodiment and accompanying drawing through limiting describe the present invention; But the present invention is not limited thereto, and the those of ordinary skill of technical field can carry out various corrections and distortion under the present invention in the equivalency range of technological thought of the present invention and claim scope.

Claims

1. a complex heat transfer pipe is characterized in that,

Comprise:

First body, it is made up of first metal material, is formed with more than one projection at its outer surface,

Second body, it is bonded on the inboard of above-mentioned first body, is made up of second metal material with physical characteristic different with above-mentioned first metal material, is formed with more than one ridge projections at the inner surface of this second body, and

Boundary face, it is joined by above-mentioned first body and above-mentioned second body and forms;

The caused noncontact rate in slit that exists in above-mentioned boundary face is defined by following mathematical expression, and this noncontact rate is below 30%,

Wherein, L is illustrated in the arc length summation in the slit that the boundary face of complex heat transfer pipe exists, the radius of r ' expression boundary face.

2. complex heat transfer pipe according to claim 1 is characterized in that, above-mentioned noncontact rate is 5.0%～25.3%.

3. complex heat transfer pipe according to claim 1 is characterized in that,

The rigidity of above-mentioned first body is 60～130Gpa,

The rigidity of above-mentioned second body is 100～200Gpa.

4. complex heat transfer pipe according to claim 1 is characterized in that, above-mentioned first metal material is Al or Al alloy.

5. complex heat transfer pipe according to claim 4 is characterized in that, the rigidity of above-mentioned first body is 60～130Gpa.

6. complex heat transfer pipe according to claim 4 is characterized in that, above-mentioned second metal material is any in Cu, Cu alloy, Ti, Ti alloy, SUS and SUS alloy.

7. complex heat transfer pipe according to claim 6 is characterized in that, the rigidity of above-mentioned second body is 100～200Gpa.

8. complex heat transfer pipe according to claim 1 is characterized in that, above-mentioned first metal material is Cu or Cu alloy.

9. complex heat transfer pipe according to claim 8 is characterized in that, the rigidity of above-mentioned first body is 60～130Gpa.

10. complex heat transfer pipe according to claim 8 is characterized in that, above-mentioned second metal material is any in Ti, Ti alloy, SUS and SUS alloy.

11. complex heat transfer pipe according to claim 10 is characterized in that, the rigidity of above-mentioned second body is 100～200Gpa.

12. complex heat transfer pipe according to claim 1 is characterized in that,

Above-mentioned first metal material is the alloy of any or they among Al and the Cu,

Above-mentioned second metal material is the alloy of any or they in Cu, Ti and SUS, selected,

The rigidity of above-mentioned first body is 60～130Gpa,

The rigidity of above-mentioned second body is 100～200Gpa.

13. a heat exchanger is characterized in that, this heat exchanger comprises the described complex heat transfer pipe of claim 1.

14. a heat-exchange system is characterized in that, this heat-exchange system comprises the described heat exchanger of claim 13, and utilizes this heat exchanger to carry out heat exchange.

15. the manufacturing approach of a complex heat transfer pipe is characterized in that,

Comprise following step:

Second metal tube that will be used for second body is inserted into the inside of first metal tube that is used for first body, makes the step of naked pipe through the expander operation,

Put into the chipware that is used to form ridge projections in the inside of above-mentioned naked pipe, and set and be used for forming under the state of roller of projection, while rotate the step of naked pipe tractive naked pipe in the outside of above-mentioned naked pipe with spiral;

Applied pressure and the pressure when forming above-mentioned ridge projections and above-mentioned projection are adjusted in above-mentioned expander operation; The caused noncontact rate in slit that makes the boundary face that first body and second body join is below 30%; This noncontact rate is defined by following mathematical expression

Wherein, L is illustrated in the arc length summation in the slit of boundary face existence, the radius of r ' expression boundary face.