CN1596360A

CN1596360A - Heat exchanger for providing supercritical cooling of a working fluid in a transcritical cooling cycle

Info

Publication number: CN1596360A
Application number: CNA028236556A
Authority: CN
Inventors: 斯蒂芬·梅默里; C·J·罗杰斯; 格雷戈里·G·休斯; 弗兰克·M·格里普; 里菲夸特·奇玛; 威廉·马库森; 肯尼思·里特; 弗兰克·费特尔
Original assignee: Modine Manufacturing Co
Current assignee: Modine Manufacturing Co
Priority date: 2001-11-30
Filing date: 2002-10-30
Publication date: 2005-03-16
Anticipated expiration: 2022-10-30
Also published as: RU2004117856A; CN100380081C; WO2003048670A1; US20030102113A1; AR037428A1; MXPA04004660A; JP2005512009A; CN101089533A; CA2467137A1; RU2319094C2; TW200301815A; AU2002365762A1; AU2002365762B2; KR20050058253A; EP1448945A1; BR0214479A

Abstract

A heat exchanger (10) preferably provides supercritical cooling to the refrigerant of a transcritical cooling system (12). The heat exchanger (10) includes a pair of elongated headers (20, 22) having longitudinal axes (24, 26) disposed substantially parallel to each other, a plurality of elongated tubes (28) spaced in side-by-side relation along the longitudinal axes (24, 26) of the headers (20, 22), and serpentine fins (30) extending between adjacent pairs of the tubes. Each of the tubes (28) has a first end (31) connected to the header (20) and a second end (32) connected to the other header (22) to the headers (20, 22). Each of the tubes (28) is folded upon itself to define at least two parallel legs (36) of the tubes (28) so that the refrigerant flows serially through at least two parallel fluid passes (38) from the header (20) to the header (22) Each of the tubes (28) has a flattened cross-section, and the parallel legs (36) of each of the tubes (28) are preferably spaced from each other, with the major dimension D of each of the parallel legs lying in a common plane. Preferably, each of the serpentine fins (30) has a transverse width W extending across the parallel legs (36) of the adjacent tubes (28). Each of the fins (30) includes a plurality of alternating tabs (40) and elongated separations (42) extending parallel to the parallel legs (36) and located between the parallel legs (36) of the adjacent tubes (28) to divide the width W of each fin (30) into two or more discrete fin elements (44) that are connected to each other by the tabs (40). Each of the fin elements (44) corresponds to and extends along one of the parallel legs (36) of each of the adjacent tubes (28).

Description

Be used for providing the heat exchanger of the overcritical cooling of working fluid striding critical cool cycles

The field of the invention

The present invention relates to heat exchanger, more more specifically, relate to and be used for providing the heat exchanger of the overcritical cooling of working fluid striding critical cool cycles.

Background of the present invention

A common form of heat exchanger is to comprise so-called " core " made by pipe and interconnected fin.A kind of fluid passes through the pipe of core, and second kind of fluid then passes through fuse in the space between fin and pipe.Two end opposite of pipe are connected on the house steward or " groove " of pair of parallel usually, and a house steward is the inlet house steward, and another house steward is then for to draw and to draw the outlet header of pipe respectively with a kind of fluid.

This medium-sized heat exchanger is used for various purposes, and such as radiator, condenser, evaporimeter, charger-air cooler, oil cooler etc., they can be used on the vehicle all.A common form of such heat exchanger is celebrated as parallel flow heat exchanger, and wherein, many mouthfuls of flat pipes are through the over-heat-exchanger cold-producing medium that leads.Flat tube is normally straight, and each house steward is then spaced-apart at the opposition side of heat exchanger, to admit the opposite end of pipe.But, know that want the pipe of bending flat like this, so that the shape of every pipe becomes so-called " hair clip " formula pipe with two parallel legs, house steward places adjacent to each other with entrance and exit, to admit the end of pipe.A kind of such structure is shown in the U.S. Patent No. 5531268 of issuing people such as Hoshino.Though applicable to its desired purposes, usually leave some room for improvement in the structure shown in No. 5531268 patents.In addition, this structure is also inapplicable or not best as striding in the critical cool cycles in the air-conditioning system that some relies on higher operating pressure, and this transcritical cooling systems needs a gas cooler, to be used to provide picture carbon dioxide (CO ₂) the overcritical cooling of such cold-producing medium.

The worry of the environment aspect that increases day by day that causes as the use of CFC12, (degree is less) HFC134a for many traditional cold-producing mediums causes considering to stride critical CO ₂System is particularly to the use in the vehicular applications.Reason on the one hand is, the CO that uses in this system as cold-producing medium ₂From the requirement of atmosphere, its result is, to be back in the atmosphere the then final CO that can not increase in the atmosphere if it leaks from system when beginning ₂Content.In addition, though from the viewpoint of greenhouse effects, CO ₂And be out of favour, but it does not influence ozone layer, can not cause the increase of greenhouse effects, because it can finally not increase the CO in the atmosphere owing to leakage ₂Content.

Overview of the present invention

Main purpose of the present invention is for providing a kind of improved new-type heat exchanger.

Another object of the present invention is for providing a kind of improved heat exchanger, and it is applicable to the overcritical cooling of working fluid in striding critical cool cycles.

One exemplary embodiment of the present invention reach some aforementioned purpose at least being used for striding critical cool cycles and providing in the heat exchanger of overcritical cooling of working fluid.This heat exchanger comprises the pipe and the wave-fin of the head of a pair of length, many length, this head has the longitudinal axis that is provided with substantially in parallel with each other, this pipe is spaced-apart by relation side by side along the longitudinal axis of head, every pipe is folding by himself, to define at least two parallel legs of pipe, so that working fluid sequentially flow to another head through at least two parallel paths from a head, this wave-fin extends between adjacent each is to pipe, the length that each fin has a parallel leg that is parallel to adjacent pipe to extend.Every pipe has a flattened cross-section with major dimension and secondary size.The major dimension of the parallel leg of every pipe is positioned at a common plane of crossing the longitudinal axis of head substantially.Every pipe has first end and that is connected to a head to be connected to second end of another head, to transmit working fluid between two heads.

In one form, each wave-fin has the transverse width of the parallel leg extension of crossing adjacent pipe.Each fin comprises many wing plates that replace and the long partition that parallel leg extends that is parallel to, wing plate and partition are divided into the fin elements of many dispersions that connect together each other by wing plate with the width with each fin between the parallel leg of adjacent pipe.Each fin elements is corresponding to one of every adjacent pipe parallel leg and along its extension.

In one form, the parallel leg of every pipe separates each other.

In one form, every pipe folds twice at least by himself, to define at least three parallel legs of pipe, so that working fluid sequentially flow to another head through at least three parallel fluid passages from a head.

In one form, every pipe all is many mouthfuls of pipes, and its hydraulic diameter is in 0.015～0.040 inch scope.

In one form, the major dimension of every pipe is not more than 0.500 inch, and secondary size then is not more than 0.100 inch.

In one form, each fin has one to be parallel to the fin height that the longitudinal axis of head extends from an adjacent pipe of pipe to, and the major dimension of pipe then is not more than fin height.

In one form, the major dimension of the pipe longitudinal axis that is parallel to head in the place that tube end is connected to head extends.

The description of the drawings

Fig. 1 is the more or less elevation of signal that comprises the cooling system of implementing heat exchanger of the present invention;

Fig. 2 is the elevation of heat exchanger shown in Figure 1;

Fig. 3 is the side view of heat exchanger shown in Figure 2;

Fig. 4 is the vertical view of heat exchanger shown in Figure 2;

Fig. 5 is the partial sectional view along the amplification of the 5-5 line of Fig. 3;

Fig. 6 is the partial view of the amplification of the pipe that uses in the heat exchanger shown in Fig. 1～5;

Fig. 7 is the pipe that uses and the perspective view of fin in implementing heat exchanger of the present invention.

The explanation of preferred embodiment

Referring to Fig. 1, contact one basic cooling system 12 illustrates implements heat exchanger 10 of the present invention, and this cooling system is by striding the critical cycle operation.This heat exchanger 10 illustrates by the form of gas cooler 13, this cooler by in the medium of the fin side of heat exchanger 10 such as air stream A heat release to working fluid or cold-producing medium such as CO ₂Overcritical cooling is provided.This cooling system 12 comprises a heat exchanger 10, one compressor 14, one expansion gear 16, one evaporimeter 17, one gatherer 18 (choosing wantonly) and a suction line heat exchanger 19, this compressor is compressed to supercritical pressure with the cold-producing medium of gas phase, to be used for delivering to heat exchanger 10, this expansion gear reduces the pressure from the cold-producing medium that heat exchanger 10 is received, so that have at least some cold-producing medium to enter liquid phase state, this evaporimeter is passed to cold-producing medium with heat from a kind of medium, so that cold-producing medium is become gas phase from liquid phase, this suction line heat exchanger comes out heat from heat exchanger 10 cold-producing medium pass to from evaporimeter 17 or gatherer 18 (if you are using) in the cold-producing medium that comes out.Should be understood that heat exchanger 10 can be used in the cooling system of striding critical cool cycles of the cooling system of other type and other configuration, and be not limited to use, unless in claims, illustrate especially with special cooling system shown in Figure 1.In addition,, when being used for other purposes such as condenser or evaporimeter, also prove favourable, no matter whether it uses in conjunction with striding critical cool cycles though disclosed heat exchanger 10 can provide significant advantage when using as gaseous coolant.

Referring to Fig. 2～4, heat exchanger 10 comprises: the

tubular head

20 and 22 of a pair of length, and they have the

longitudinal axis

24 and 26 that is provided with substantially in parallel with each other respectively; The pipe 28 of many length, they are spaced-apart by relation side by side along the longitudinal axis of

head

20,22; And wave-fin 30, they extend between adjacent each is to pipe 28.Should be understood that in the embodiment shown each fin 30 extends along the length L of pipe 28, still, for the ease of expression, the mid portion of not shown length in Fig. 2.Fin 30 is preferably made louvered.As shown in Figure 3, every pipe 28 has first end 31 and second end 32 that is connected on the head 22 that is connected on the head 20, to be used for transmitting cold-producing medium between

head

20,22.

As what be clear that in Fig. 5, each root pipe 21 has makes the flattened cross-section with major dimension D and secondary size d.Every pipe 28 is preferably more than one mouthful of pipe, and in highly preferred embodiment, is one to have the many mouthfuls of pipes that its scope is 0.015～0.045 inch a hydraulic diameter.Thus, six mouths 34 are shown though should be understood that Fig. 5,, in some purposes, comprise also can being useful in 28 greater or less than six mouths 34 at every many mouthfuls pipes.For example, in a preferred embodiment, every pipe has four mouths 34.In a preferred embodiment, for example as striding critical CO ₂Desired like that as the gas cooler operation in the cooling system, the shape of pipe is made can resist the burst pressure of 6500PSI at least under 70 environment.

The major dimension D of every pipe 28 is not more than 0.500 inch usually, and secondary size d then is not more than 0.100 inch usually, and in some preferred embodiment, secondary size d is not more than 0.060 inch usually, and major dimension D is not more than 0.320 inch usually.Thus, reduce major dimension D many advantages can be provided.For example, because every pipe 28 comprises at least two parallel legs 36, the degree of depth of heat exchanger 10 depends on the size of major dimension D widely, and will reduce along with reducing of major dimension D.In addition, the diameter of

head

20,22 can reduce in a structure, and wherein, the major dimension D of

tube end

31,32

crosses head

20,22 in the place that

head

31,32 is connected to

head

20,22 longitudinal axis extends, rather than the parallel construction shown in Fig. 1～4.In addition, the length of

head

20,22 can reduce in a structure, wherein, shown in Fig. 1～4 like that, the

longitudinal axis

24,26 that the major dimension D of

tube end

31,32 is parallel to

head

20,22 extends.At last, reduce major dimension D and in some preferred embodiment, can allow to reduce fin height.But, should be understood that higher fin height can provide benefit to the efficient of air side.

As what be clear that in Fig. 3,4 and 6, every pipe 28 is folding by himself, to define at least two parallel legs 36 of pipe 28, so that cold-producing medium sequentially 20 flow to head 22 from the head through at least two parallel fluid passages 38.Thus, preferentially will enter the mouth head and

outlet head

20,22 are chosen to, and when moving as gas cooler, heat exchanger 10 are moved with respect to the fluid of heat exchanger 10 fin sides is mobile by the configuration of transverse convection.Every pair of parallel leg connects with a folding 39, and this folding is reversed 90 ° of 26,24 extensions so that major dimension D parallels to the axis in the place of folding 39 in the place of folding 39 with respect to leg 36, rather than crosses it.Folding 39 preferably by at first with respect to pipe 28, in the place of folding 39 leg 36 is reversed 90 °, about 180 ° and form folding 39 backs and form of the crooked pipe in the place of folding 39 then.Thus, should be understood that each leg 39 can be along same direction shown in Fig. 3 and 6 with respect to 90 ° of folding 39 reverse, or in opposite direction, this to depend on which kind of configuration provides maximum benefit to the specific use of heat exchanger 10.As what in Fig. 6, be clear that, the parallel leg 36 of the every pipe 28 segment distance X that preferably separates each other, the major dimension D of each parallel leg 36 is arranged in the common plane shown in the dotted line P of Fig. 2 and 5, and the

longitudinal axis

24,26 of

head

20,22 is crossed on this plane substantially.This flow direction that just allows major dimension D to be parallel to medium extends through fin 30.Spacing X has reduced the conduction of heat from a leg 36 to another leg, and this is favourable when heat exchanger 10 provides overcritical cooling, because the temperature of cold-producing medium can change when a head 20 flow to another head 22 through pipe 28 gravely at it.Distance X preferably is enough to make the space between the adjacent parallel leg 36 be minimum or prevent this space closure by brazing material when brazed metal heat exchanger 10, but little again to the degree of depth that strengthens heat exchanger 10 irrelevantly.Though the adjacent parallel leg 36 of every pipe 28 is separated each other, in some purposes, this may not need and/or be out of favour at interval.

Shown in Fig. 1 and 5, each fin 30 has a fin height H who equals the spacing between the adjacent pipe 28, just, has one to be parallel to the fin height H that the

longitudinal axis

24,26 of

head

22,28 extends from a pipe 28 to adjacent pipe 28.The major dimension D of pipe 28 preferably is not more than fin height H.This just allows a kind of like this structure, wherein, each

tube end

31,32 can reverse 90 ° with respect to parallel leg 36, extend from shank this end, extends so that the major dimension D of

end

31,32 is parallel to the

longitudinal axis

24,26 of

head

20,22 as shown in Figure 2 in the place that

tube end

31 and 32 is connected to head 20 and 22.This at this place, wishes that the diameter of

head

20,22 is as much as possible little to being important in the high-voltage applications of striding the gas cooler in the critical refrigeration systems such as being used in.It is contemplated that, or even possible, in this structure, major dimension D is greater than the internal diameter of any head 20,22.Though the major dimension D of

preferred tube end

31,32 extends at the

longitudinal axis

24,26 that the place that

tube end

31,32 is connected to

head

20,22 is parallel to

head

20,22, it also can be favourable in some purposes that major dimension D is oriented at other of these places.For example, in some purposes, making the major dimension D of

tube end

31,32 cross that

longitudinal axis

24,26 extends in the place that

tube end

31,32 is connected to

head

20,22 may be useful.

As previously discussed, the length L that each wave-fin 30 has a parallel leg 36 that is parallel to adjacent pipe 28 to extend, and, the transverse width W of parallel leg 26 extensions of crossing adjacent pipe 28 is arranged as what in Fig. 4, be clear that.For the purpose of illustrating, Fig. 5 illustrates three legs 36 of pipe 28, and Fig. 7 then illustrates a fin with a heat converter structure 10 uses, and in this structure, every pipe has only two parallel legs 36.Referring to Fig. 7, each fin 30 comprises many wing plates that replace 40 and long partition 42, this partition is parallel to parallel leg 36 and extends, and between the parallel leg 36 of adjacent pipe 28, with the width W with each fin 30 be divided into two or more dispersions the fin bar or the unit 44, they connect together each other with fin 40.Each fin elements 44 is corresponding to one of each adjacent pipe 28 parallel leg 36 and along its extension.Partition 42 is linear normally, and the opposed edges 45 that faces with each other is arranged, and crosses the direction that medium flows through fin 30 usually.Though Fig. 7 illustrates the pipe 28 that is used to have two parallel legs 36, but, should be understood that the above-mentioned structure that comprises wing plate 40, partition 42 and fin elements 44, structure shown in Fig. 2～5 also is used in the heat exchanger 10 that has in every pipe 28 more than two parallel legs 36.In this structure, each fin 30 is preferably crossed over all parallel legs 36 and is extended, and fin elements 44 is corresponding to each parallel leg 36 of each adjacent pipe 28 and along its extension, and wing plate 40 and partition 42 then are arranged between each fin elements 44.

The wing plate that replaces 40 of each fin 30 is used to limit fin 44 and moves relative to each other, so that each fin 30 keeps as a whole parts in assembling heat exchanger 10, and, further keep fin elements 44 to be in alignment with each other better, so that reduce to minimum at the pressure of the fin side of heat exchange.The purposes of long partition 42 is for making heat conduction from every of every pipe 28 parallel leg 36 to any adjacent parallel leg 36 for minimum by interruption, thereby makes heat conduction between the leg parallel with every the 36 related fin elements 44 for minimum.In the purposes of the such gas cooler 13 of image pattern 2～4, this is welcome, and in this purposes, the temperature working fluid that enters heat exchanger 10 differs widely with the temperature of the working fluid of the working fluid 10 that leaves heat exchanger 10.Calculate, do not make the fin 30 (making the fin of louvered usually) of louvered, can between parallel leg 36, conduct total heat transfer of as many as 40% by fin, thereby can not drain in the air for the height that has only 10%.In some cases, in fact the heat conduction that receives from the fin 30 of the hot side of heat exchanger can make the fin 30 of cold side of heat exchanger 10 than the workflow body heat of the pipe 28 that flows through cold side, and this just causes the unwelcome situation that heat is transmitted back to working fluid before working fluid leaves heat exchanger 10.Like this, for each long partition 42, it is desirable to, extend incessantly along the length of fin 30 as far as possible, and for the number and the size of wing plate 40, then make minimum, when assembling, prevent each fin elements 44 separation to satisfy, and when assembling, keep the acceptable degree of registration between each fin elements 44 at each fin 30.

According to aforementioned, should be understood that for wing plate 40 and long partition 42 to have many kinds of configurations.For example, in the embodiment of a fin of making of aluminium 30, be in the state of expansion at fin 30, each wing plate 40 extends about 0.020 inch along the length of fin 30, the partition 42 of the length of the fin 30 that each is made of aluminium then extends about 8.0 inches along the length of the fin 30 that launches, wing plate 40 and partition 44 all have the length of the length extension that is parallel to the fin 30 that is in deployed condition, and the length ratio of the length of partition 42 and wing plate 40 is in 200～600 scope.In another example as shown in Figure 7, each long partition 42 is crossed 10～14 foldings from a wing plate 40 incessantly and is extended to next wing plate 40 when fin 30 is in folded state.

Though wing plate 40 can form by many modes with partition 42,, preferably partition 42 is formed as otch in the fin material or joint-cutting, when forming fin 30, do not need to remove fin material.A kind of mode of this joint-cutting or otch of finishing is being made a simple otch for adopt the splitting cutting disc in the rolling mould of fin fin 30 when a light sheet material forms fin 30.For the sub-fraction of cutting disc, can when changeing, each remove sliver, to form wing plate 40, still be attached on the fin elements of adjoining 44 of fin 30 to guarantee each fin elements 44.The otch or the joint-cutting of one entity so just are provided in fin 30, and do not undermine fin surface.In a kind of like this structure, but edge 45 leans on effectively by halves each other mutually.A kind of worry is, fin elements 44 may be in brazing process soldering together.Make this worry on the sidewall of minimum a kind of method for the leg that leans against fin 30 36 that brazing material is placed on pipe, rather than brazing material is coated on the fin 30.Make this worry for minimum another kind of method for staggering away from the place of wing plate 40 adjacent fin elements 44 with fin 30, this can allow to use clad fins.Another kind method forms very little blinds for opening by the edge 45 that joint-cutting forms is curved a little, and this also can allow to be used for clad fins.Also having a kind of method is each wing plate part 40 of pressure-sizing, further to make fin elements 44 separated from one another.Also have, last a kind of method can allow to be used for clad fins.Though preferred joint-cutting, in some purposes, the partition 42 that forms as slit may be useful, and this slit does not need to remove fin material when forming in fin 30.In this connection, this slit has the width of the width W that is parallel to fin 30 of a some thousandths of inch may be just enough.

Though preferred fin 30 comprises wing plate 40 and partition 42, in some purposes, wing plate 40 and partition 42 also are out of favour and/or do not need.

Preferably fin 30 is made louvered, known they many forms are arranged.The accurate configuration of blinds depends on the parameter of specific use widely, and for example the existing pressure of the fin side of the fluid of the fin side of heat exchanger 10, heat exchanger 10 falls, the quantity of the parallel leg 36 in every pipe 28 and odd number is arranged in every pipe 28 still is the parallel leg 36 of even number.

Should be understood that heat exchanger 10 will provide the overcritical cooling of cold-producing medium usually when in system 12 during as gas cooler 13 operation; But, also have some ruuning situation, wherein, environment temperature subcritical temperature, in the case, heat exchanger 10 will be as the condenser operation of the subcritical cooling that cold-producing medium is provided.

As what be clear that in Fig. 3,10 pairs of every pipes 28 of shown heat exchanger comprise 12 parallel legs 36.But, be understood that, every kind of purposes to heat exchanger 10, the number of best parallel leg depends on the special parameter of specific use widely, the working fluid of system 12 for example, shell and heat exchanger 10 must be installed in environment wherein, and the function of heat exchanger, that is to say, as gas cooler, condenser be used in air-conditioning system or heat pump in evaporimeter.For example, in some purposes, may have only two or three parallel legs 36 to every pipe 28.

As another kind of selection scheme, can in one or two

head

20,22, one or more flow deflectors be set, with subclass cold-producing medium 20 is guided to head 22 from the head through pipe 28, different subclass through pipe 28 is back to head 20 then, and can be by that analogy, pass through on demand back and forth many, from a head to another head, so that the performance by every kind of specific use regulation to be provided.

In a preferred embodiment,

head

20,22, pipe 28 and fin 30 are used the aluminium manufacturing all, and with suitable brazing material soldering.But, should be understood that in some purposes, also can to these parts, adopt other suitable material according to the regulation of the parameter of specific use.

Be to be further appreciated that, though at the heat exchanger 10 shown in Fig. 1～3 is that

longitudinal axis

24,26 along continuous straight runs of

pressing head

20,22 extend, shown in the parallel leg 36 of pipe 28 then extends by vertical direction, but in some purposes, it also is welcome that heat exchanger 10 has different orientations, a kind of orientation is for example arranged, wherein,

axis

24,26 vertically extends, and parallel leg 36 then along continuous straight runs extends.In addition, though be positioned at the same side of heat exchanger 10 at the

head

20,22 of the heat exchanger 10 shown in Fig. 1～3,, in some purposes, the opposition side that

head

20,22 is positioned at heat exchanger 10 also is welcome.The structure of

head

20,22 in the same side of heat exchanger causes the parallel leg 36 of every pipe 28 to be even number usually, and

head

20,22 then causes the parallel leg 36 of every pipe 28 to be odd number in the structure of the opposition side of heat exchanger 10 usually.Nature if requirement is arranged, for specific use, also can adopt a plate of being furnished with groove, to replace the

head

20,22 of tubulose.

Claims

1. be used for striding the heat exchanger that critical (transcritical) cool cycles provides overcritical (supercritical) of working fluid to cool off, this heat exchanger comprises:

The head of a pair of length, they have longitudinal axis parallel to each other substantially;

The pipe of many length, they are spaced-apart by relation side by side along the longitudinal axis of head, every pipe has one to have the flattened cross-section of leading (major) size and pair (minor) size, every pipe has first end that is connected to a head, with second end that is connected to another head, between two heads, to transmit working fluid, every pipe is folding by himself, to define at least two parallel legs of pipe, so that working fluid is sequentially through at least two parallel fluid passages, flow to another head from a head, the parallel leg of every pipe separates each other, and the major dimension of every parallel leg is positioned at the common plane of the longitudinal axis that crosses head substantially; And

Wave-fin, they extend between adjacent each is to pipe, the length that each fin has a parallel leg that is parallel to adjacent pipe to extend, and the transverse widths that have the parallel leg of at least two of crossing adjacent pipe to extend, each fin comprises many wing plates that replace and the long partition (separations) that parallel leg extends that is parallel to, this wing plate and partition are between the parallel leg of adjacent pipe, be divided into the fin element of many dispersions that are connected with each other by wing plate with the width with each fin, each fin element is corresponding to one of every adjacent pipe parallel leg and along its extension.

2. heat exchanger as claimed in claim 1 is characterized by, and the major dimension of every pipe is not more than 0.500 inch, and secondary size then is not more than 0.100 inch.

3. heat exchanger as claimed in claim 1 is characterized by, and the major dimension of every pipe is not more than 0.320 inch, and secondary size then is not more than 0.060 inch.

4. heat exchanger as claimed in claim 1, its feature are being that every pipe folds at least twice, to define at least three parallel legs of pipe, so that working fluid sequentially flow to another head through at least three parallel paths from a head.

5. heat exchanger as claimed in claim 1 is characterized by, and each fin has one to be parallel to the fin height that the longitudinal axis of head extends from an adjacent pipe of pipe to, and the major dimension of pipe then is not more than fin height.

6. heat exchanger as claimed in claim 1 is characterized by, and the major dimension of every tube end is parallel to head in the place that tube end is connected to head longitudinal axis extends.

7. heat exchanger as claimed in claim 1 is characterized by, and above-mentioned partition is joint-cutting in above-mentioned fin, and it does not need to remove fin material when forming in fin.

8. heat exchanger as claimed in claim 1 is characterized by, and above-mentioned partition is slit in above-mentioned fin, and it does not need to remove fin material when forming in fin.

9. heat exchanger as claimed in claim 1, it is characterized by, for at least one fin under the fin non-folded state, above-mentioned partition and above-mentioned wing plate all have the length of the length extension that is parallel to fin, and the length of partition and the length ratio of wing plate are then in 200～600 scope.

10. heat exchanger as claimed in claim 1 is characterized by, and at least one pipe is many mouthfuls of pipes, and it has the hydraulic diameter in 0.015～0.040 inch scope.

11. be used for providing the heat exchanger of the overcritical cooling of working fluid striding critical cool cycles, this heat exchanger comprises:

The pipe of many length, they are spaced-apart by relation side by side along the longitudinal axis of head, every pipe has a flattened cross-section with major dimension and secondary size, every pipe has first end that is connected to a head, with second end that is connected to another head, between two heads, to transmit working fluid, every pipe is folding by himself, to define at least two parallel legs of pipe, so that working fluid is sequentially through at least two parallel fluid passages, flow to another head from a head, the major dimension of the leg that each pipe is parallel is positioned at the common plane of the longitudinal axis that crosses head substantially; And

Wave-fin, they extend between adjacent each is to pipe, the length that each fin has a parallel leg that is parallel to adjacent pipe to extend, and the transverse widths that have the parallel leg of at least two of crossing adjacent pipe to extend, each fin comprises many wing plates that replace and the long partition that parallel leg extends that is parallel to, this wing plate and partition are between the parallel leg of adjacent each root of pipe, be divided into the fin element of many dispersions that are connected with each other by wing plate with the width with each fin, each fin element is corresponding to one of every adjacent pipe parallel leg and along its extension.

12. the heat exchanger as claim 11 is characterized by, the major dimension of every pipe is not more than 0.500 inch, and secondary size then is not more than 0.100 inch.

13. the heat exchanger as claim 11 is characterized by, the major dimension of every pipe is not more than 0.320 inch, and secondary size then is not more than 0.060 inch.

14. the heat exchanger as claim 11 is characterized by, every pipe folds at least twice, to define at least three parallel legs of pipe, so that working fluid flow to another head sequentially through at least three parallel paths from a head.

15. the heat exchanger as claim 11 is characterized by, the major dimension of every tube end is parallel to head in the place that tube end is connected to head longitudinal axis extends.

16. the heat exchanger as claim 11 is characterized by, above-mentioned partition is joint-cutting in above-mentioned fin, and it does not need to remove fin material when forming in fin.

17. heat exchanger as claim 11, it is characterized by, for at least one fin under the fin non-folded state, above-mentioned partition and above-mentioned wing plate all have the length of the length extension that is parallel to fin, and the length of partition and the length ratio of wing plate are then in 200～600 scope.

18. be used for providing the heat exchanger of the overcritical cooling of working fluid striding critical cool cycles, this heat exchanger comprises:

The pipe of many length, they are spaced-apart by relation side by side along the longitudinal axis of head, every pipe has a flattened cross-section with major dimension and secondary size, the major dimension of every pipe is not more than 0.500 inch, secondary size then is not more than 0.100 inch, every pipe has first end and that is connected to a head to be connected to second end of another head, between two heads, to transmit working fluid, every pipe is folding by himself, to define at least two parallel legs of pipe, so that working fluid is sequentially through at least two parallel fluid passages, flow to another head from a head, the major dimension of the parallel leg of every pipe is positioned at the common plane of the longitudinal axis that crosses head substantially; And

Wave-fin, they extend between above-mentioned adjacent each is to pipe, the length that each fin has a parallel leg that is parallel to adjacent pipe to extend.

19. be used for providing the heat exchanger of the overcritical cooling of working fluid striding critical cool cycles, this heat exchanger comprises:

The head of a pair of length, they have the longitudinal axis that is set parallel to each other substantially;

The pipe of many length, they are spaced-apart by relation side by side along the longitudinal axis of head, every pipe has a flattened cross-section with major dimension and secondary size, every pipe has first end and that is connected to a head to be connected to second end of another head, between two heads, to transmit working fluid, every pipe folds at least twice by himself, to define at least three parallel legs of pipe, so that working fluid is sequentially through at least three parallel fluid passages, flow to another head from a head, the major dimension of the parallel leg of every pipe is positioned at the common plane of the longitudinal axis that crosses head substantially; And

20. be used for providing the heat exchanger of the overcritical cooling of working fluid striding critical cool cycles, this heat exchanger comprises:

The pipe of many length, they are spaced-apart by relation side by side along the longitudinal axis of head, every pipe has a flattened cross-section with major dimension and secondary size, it is 0.015～0.040 inch many mouthfuls of pipes that every pipe is the scope with hydraulic diameter, every pipe has first end and that is connected to a head to be connected to second end of another head, between two heads, to transmit working fluid, every pipe is folding by himself, to define at least two parallel legs of pipe, so that working fluid is sequentially through at least two parallel fluid passages, flow to another head from a head, the major dimension of the parallel leg of every pipe is positioned at the common plane of the longitudinal axis that crosses head substantially; And