SE1050615A1 - Heat exchanger with extended heat transfer surface around attachment points - Google Patents

Abstract

1G 17 AE STRåCT A heet exehehger ter ert ett eeeier eehteršeee et teeet twfe heetexehehger members, eeeh eheteethg e respective fåret ehehhet (12), wherethe eeeehe ehehnei (Y) te terrhed between the et ieeet twe heat exehehgermembers (tG, 1%). At Eeeet ehe ef the heet exehehger members preeehtethreugh hete prevšdthg eeeeee treht eutetde the heet exehenger te the eeeeheehehhet Eteeted ter puhtteetieht Ftg. t

Description

AWAPÅTENT AB Kontor/Handläggare Linköping/Ota BokingelQPN 'EU TitanX Engine Cooiing Hoiding AB Vår referens SE-21G45Û83 Ansökningsnr HEAT EXCHANGER HAViNG EXTENDED HEAT TRANSFER SURFACEARÛUND FASTENENG POENTS Technicai Fieid The present disciosure reiates to heat exchangers, and moreparticuiariy to heat exchangers which are suitabie for use as oii cooiers in heavy vehicies.

BackgroundA heat exchanger for use as an oii oooier in eg. heavy vehicies may be formed from a piuraiity of paraiiei piates, which may be stacked, such thatparaiiei ohanneis are formed between the piates. Typicaiiy, every second oneis arranged to carry a flow of cooiing medium, and the other ohanneis arearranged to carry a fiow of heat-emitting medium. The piates may be brazedtogether to form a singie heat-exchanger unit.

The basic prinoipie for forming such a heat exchanger is disciosed ine.g. WGQÛ/ißïšsßrfiii and WO2004027334A1.

When in use, the heat exohanger is typioaiiy arranged in a cavity,through which the cooiing medium is caused to fiow, white heat-emittingmedium is fed through an intet opening of the heat exchanger, through thechanneis for the heat-emitting medium, after which the cooied heat-ernittingmedium is extracted through an outiet opening of the heat exchanger. i-ience,the channeis for the cooiing medium are at ieast partiaiiy open to the oavity.

JP 20ü5337528A discioses a heat exchanger making use ofprotrusions or a circuiar ridge around the oii channei of an oii cooier for anautomobiie in order to eiiminate the washers otherwise used between theheat exchanger sheets to provide structure! integrity of the heat exchanger inthe areas which are subiected to an eievated force resuiting from the oiipressure.

”FO 2G 3G 2 in heat exchangers of the present type, it is desirabie to increase theefficiency of the heat exchanger, such that more cooiing can be achieved witha srnaiier and/or fighter heat exchanger. i-iowever, when designing heat exchangers, it is necessary to considerboth strength aspects of the heat exchanger itseif and aiso rnounting aspects,including the shape of the space where the heat exchanger is to be rnounted,and the position of ports and iniet/outiet for the medium to be cooied and thecooiing medium, respectiveiy. i-ience there is a need for further technicai deveioprnent with a view toproviding increased freedom in the design of heat exchangers white maintain-ing or increasing the strength and efficiency of the heat exchanger.

Summagit is a generai object to provide a heat exchanger and a heat exohanger system which aiieviate or eiiminate the drawbacks of the prior art.it is a panicuiar object to provide a heat exchanger and a heat exchanger system having aiiowihg freedom in design white at the same time maintaining or increasing the strength and efficiency of the heat exchanger. it is a further object to provide a heat exchanger system which is fighterand/or more compact.

The invention is defined by the appended independent ciaims withembodiments being set forth in the dependent ciaims, in the drawings and inthe foiicwing description.

According to a first aspect, there is provided a heat exchanger for anoii cooier, comprising at ieast two heat exchanger members, each enciosing arespective first channei. A second channei is formed between the at ieast hrvoheat exchanger members. At ieast one of the heat exchanger memberspresents through hoie providing access to the second channei. it is understood that, as is conventionai in heat exchangers, the firstand second channeis are isoiated from each other and thus not incommunication with each other.

With the above heat exchanger, it is possibie to increase the effectiveheat exchanger area. Boits for attaching the heat exchanger to a waii of the 3 cavity in which the heat exchanger is arranged engage a mounting plate atthe rear side of the heat exchanger and may be accessible through thethrough hole. Alternatively, or as a complement, a recess may be provided toaccommodate for a protrusion in a wall of the cavity.

Hence, it is possible to position bolts holes or recesses more freelyover the effective area (“footprint”) of the heat exchanger, and thus to makeuse of a larger portion of the space available for the heat exchanger. The heatexchanger members may present a respective through hole, wherein thethrough holes may be substantially aligned with each other.

The through hole may be spaced from all peripheral edges of the heatexchanger member.

The “through hole being spaced from all peripheral edges of the heatexchanger member” effectively means that the medium flowing in the secondfirst channel may flow around the through hole.

An edge defining the through hole may intersect an edge of the heatexchanger at a respective point of intersection, the through hole may presenta central angle, the legs of which presenting a respective tangent point at therespective point of intersection, and the central angle may be less than about180 degrees, less than about 135 degrees or less than about 90 degrees.

Hence, the through hole may be positioned at an edge portion of theheat exchanger.

Heat exchanger plates of two separate heat exchanger members,which heat exchanger plates face each other, may present at least onerespective protrusion, arranged in the immedlate vicinity of the through holeand/or of an oil port, and the protrusions may abut each other.

Such protrusions provide increased strength while minimizing thenegative impact on the heat transfer surface. This may be particularlyadvantageous when combined with the through holes as described above,since additional heat transfer surface will be made available around the oilports.

The heat exchanger plates facing each other may present a plurality ofabutting protrusions.

At least one of the protrusions may be formed as a ridge. ft) 2G 3G 4 At ieast two of the protrusions may have different shapes.

The abutting protrusions may be joined with each other. Joiriing maybe achieved by eg. vvetding, brazing, sotderirig or gtue. "the heat exchanger may further comprise a third heat exchangermember, arranged adiacent one of the two heat exchanger members, andhaving a through hote which is aiigned with the other through hotes aiorig anorrnai of a min piane of the heat exchanger, vvherein at teast one washermay be arranged betvveen the third heat exchanger member and said one ofthe two heat exchanger members.

The at teast two heat exchanger members may present a respectivethrough hoie, and the respective through hotes may at teast partiatiy overtapeach other, thus forrning a set of overtapping through hotes. "the heatexchanger may further comprise at least one mounting member presenting amounting hote which may be accessibte through the overtapping throughhoies. in the atternative, iess than ait heat exchanger members of the heatexchanger may present a respective through hoie.

A through hoie of one of the heat exchanger members may be smaiterthan an overiapping through hote of another one of the heat exchangermembers.

Att heat exchanger members may present a respective through hota,and the through hotes may be substantiaity atigned with each other atohg anormat of a main piane of the heat exchanger members, thus forming a set ofatigned through hoies.

A first set of aiigned through hotas may be arranged at a first angtereiative to a tongitudinat centre tine through a center of an associated first oiiport and a first distance from the centre of the first oii port, and a second setof aiigned through hotes may be arranged at a second angte retative to theiongitudinat centre tine and a second distance from the centre of the first oitport.

The first and second distances may be substantiaity eouat. The firstand second angies may differ by about 'E86 degrees. in one aiternative, thefirst and second angtes may differ by iess than 186 degrees, iess than about 3G 5 'E35 degrees or iess than about 9G degrees. in another aiternative, the firstand second angies may differ by more than 180 degrees, more than about225 degrees or more than about 270 degrees.

A first set of aiigned through hoies may be arranged on a first side of aEongitudinai centre iine through centers of oii ports of the heat exohanger anda second set of aiigned through hoies may be arranged on a second side ofthe iongitudinai centre iine .

A transversat iine running through the centers of both sets of aiignedthrough hoies may be substantiaiiy perpendicutar to the iongitudinai centreiine.

A transversai iine running through the centers of both sets of aiignedthrough hoies may present an angie of tess than about 90 degrees to thecentre iine, or iess than about 75 degrees, or iess than about 60 degrees oriess than about 45 degrees. it is understood that a heat exchanger may have muitipte pairs of setsof aiigned through hoies, where the transversai iine of one pair may besubstantiatty perpendicutar to the iongitudinai centre iine, white transversaiiine of another pair may present an angte which is Eess than about 90 degreesto the iongitudinai centre iine, Öna or more of the transversai iines may intersect an oii port. in oneembodiment, a transversai iine may run through the center of an oii port.

At ieast one of the heat exchanger members may present at ieast twothrough hotas providing access from outside the heat exchanger to thesecond channei.

According to a second aspect, there is provided a heat exchanger foran oii cooier, cornprising at ieast three stacked heat exchanger memberseach enciosing a respective first channet. A respective second ohannei isformed betvveen two adiaoent ones of said heat exchanger members. An oiiport extends through the heat exchanger members and connects therespective first channeis. Heat surfaces of a first pair of adiacent heatexchanger members, which heat surfaces face each other and form anassociated second channei, present at ieast one respective protrusion,arranged in the imrnediate vioinity of the oii port, and wherein the protrusions 2G 2.5 6 abut each other. A second pair of edjacent heat exchanger members isseparateci by at ieast one substantiaiiy planer member, such as a washer,extending about a substantiai part of a ciroumference of the oii port.

According to a third aspect, there is provided an oii cooiing system,comprising a cavity having a iiouid cooiing medium intet and a iiouid cooiingmedium outiet, an oii intet for oii to be cooied and an oii outiet for cooied oii,and a heat exchanger, as described above, said heat exchanger beingsubstantiaiiy enciosed in said cavity.

The second channei may be at ieast partiaiiy formed by the cavity inwhich the heat exchanger is arranged.

According to a fourth aspect, there is provided a method for cooiing oiiin a vehicie using an oii cooiing system as described above, the methodcomprising causing oii to be cooied to fiow from the oii intet through the firstchannei to the oii outiet, and causing iiouid cooiing medium to fiow from thecooiing medium intet through the second channei to the oooiing medium outiet.

Description of the Drawinos Fig. i is a schematic perspective view of a heat exchanger for an oiicooiing system.

Figs ta-'ic are sectionai views aiong of the heat exchanger of Fig. t.

Figs 2a-2d are partiai sectionai views of aiternative embodiments ofheat exchanger members.

Figs Sa-ßb are sectionai views of aiternative embodiments of heatexchangers for oii cooiers.

Figs 4a-4b are diagrammatic views of oii cooiing systems.

Figs 5a-5d are schernatio perspective views of aiternativeembodiments of heat exchanger members.

Figs 6a~6b schematicaiiy iiiustrate a pair of heat exchanger membersaccording to en alternative embodiment.

Fig. 7 is a schematic sectionai view of a portion of a heat exchanger according to another architecture. “iQ 3G 7 Fig. 8 is a schematic view of a heat exchanger member according to another embodimeht.

Description of Embodiments Fig. 1 is a schematic view of a heat exchanger 1 for an oi! cooiingsystem. The heat exchahger is intended to be mounted as iiiustrated in Figs4a-4b, Le. substantiaiiy iongitudinaiiy in a cavity S, which may be partiaiiyformed by an engine biock of a vehicie. The heat exchanger 'i has oi! ports 3,4, which are connected by a first channe! 12 and cooiarit openings 5, o, whichaiiow cooiant to fiow through respective second chahneis 7 of the heatexchanger 1. The first and second chanhels 12, 7 are compietely separated,such that fiuids passed through them do not contact each other.

Each of the first channeis 12 is defined by a pair of joined together heatexchanger piates 17, 18 forming a heat exchanger member ti). The heatexchanger piates may be joined together by eg. weidirig, brazing, soideringor giue. Edges of the heat exchanger piates may be foided reiative to eachother as iiiustrated in Figs 2a-2d. This appiies both to periphera! edges and toedges at through hoies Q, 11 andíor oii ports 3, 4, The heat exchahger 1 may further have mounting fianges 2a, Zbintended for fixating the heat exchanger 1 to a wa!! of the cavity 8. Themouritihg fianges Ze, 2b may have hoies for oi! ports 3, 4 arid/'or bott hoies20a, 20b.

At each oi! port 3, 4, there is formed en inietioutiet ohahnei, which mayextend through a!! heat exchanger members 10 to connect the oi! ports 3, 4 tothe respective first channeis 12. The side of the heat exchahger opposite tothe port side (upper side in Fig. i) may be provided with arr oi! chanriei coverBa, 4a, which cioses the iniet/outiet channei.

Referring particuiariy to Figs ta, 'to and td, the heat exchanger i mayhave through-going hoies 9 providing access to the mountihg fiange 2a, 2b.The diameter of the through-going hoies 9 may be iarger than the diameter ofthe associated boit hoie Züa, 2Gb, such that a fastening device (eg. a screw,bott or rivet (not shown» can be introduced through the through-going hoie 8 and aiiow a head portion of the fastening device to engage the mountingfiange Za, 2b.

As is shown in Figs 1 and 1a, protrusions 178, 180 from the heatexchanger piates 17, 18 may be provided around the oii ports 3, 4 and aisoaround the through hoies 9. A protrusion 170 of one of the heat exchangerpiates 17 of a first heat exchanger member 10 may be aiigned with accrresponding protrusion 180 of a heat exohanger piate 18 of a second,adiacent heat exchanger member 1G, such that the protrusions 170, 180contact each other. The protrusions 170, 180 may be ioined with each otherthrough eg. weiding, brazing, soidering or giue. Protrusions may be providedby stamping or punching the materiai forming the heat exchanger members.Alternativeiy, materiai may be added to the surface of the heat exchangermember to form the protrusions.

Referring to Figs 2a-2d, various ways of connecting the edges of theheat exchanger piates 17, 18 are disciosed. in Fig. 2a, the edges of both the upper piate 17 and the iower piate 18are foided about 9G degrees, such the edge portions overiap aiong athickness direction of the heat exchanger member. in the particuiarembodiment shown, the tower piate extends beyond the upper piate, suchthat the verticai portion of the tower piate 18 is outside the verticai portion ofthe upper piate 17. The piates are thus ioined in a piane which is substantiaiiyperpendicuiar to a main piane of the heat exchanger member. in Fig. 2b, the edges of both the upper piate 17 and the iower piate 18are bent such that the piates are ioined in a piano which is substantiaiiyparaiiei with the main piane of the heat exchanger member. in Fig. 2c, the edges of both the upper piate 17 and the iower piate 18are foided about 90 degrees, such the edge portions overiap aiong athickness direction of the heat exchanger member. in the particuiarembodiment shown, the upper piate 17 extends beyond the iower piate 18,such that the verticai portion of the upper piate 17 is outside the verticaiportion of the iower piate 18. The piates are thus ioined in a piane which issubstantiaiiy perpendicuiar to a main piane of the heat exchanger member. 9 in Fig. Zd, the upper ptate 17 is substantiaity unbent, whereas thetower ptate 18 is bent such that a wait extending substantiatiy perpendicuiar tothe main ptane of the heat exchanger member is formed entirety of the towerptate 18. The edge of the tower otate 18 is further bent to enciose an edge ofthe upper piate 17. it is noted that white att of the edge configurations disctosed in Figs 2a~2d may be used for forming peripherai edges of the heat exchangermembers, it is atso possibte to use the edge conftgurations disctosed in Ftgs2a-2d to form edges of a through hote 9 or accommodation recess 11 asdescribed herein. Furthermore, one of the configurations may be used for theperipherat edges white another configuration is used for the through hoiesandior for the accommodation reoess. it is atsc posstbte to use differentconfigurations for the through notes andlor for through hotes andaccommodation recess.

Referring to Fig. Sa, there is disotosed an embodtment where anaccommodation recess 11 is provided. in this embodiment, the recess tsformed by through hotes in tvi/o uppermost heat exchanger members 1G. Thethrough hote of the uppermost heat exchanger member ts siightiy targer thanthe through hote of the second-to-uppermost heat exchanger member. tt isreoognized that through hoies forming an accommodation recess may beprovided in as many of the heat exchanger members as is necessary toaccommodate for eg. a protrusion in the cavity 8 where the heat exchahger isto be posttioned.

Referring to Fig. Išb, there is disciosed an embodiment whereprotrusions 179, 180 are used together with washers 19 at the same set ofaitgned through hotes (access hotes, accommodation recesses) or oit ports. Acombination of protrusions and washers can be used to opttmize eg. a weightto strength ratio of the heat exchanger by using washers bettfveen some oairsof heat exchanger members 1G, white protrusions are used between otherpairs of heat exchanger members. For exampte, washers 19 may be usedwhere the forces affecting the heat exchanger members are very iarge, whiteprotrusions 170, 186 may be used where the heat exchanger members are subjected to iess severe forces. ”iQ ZO '10 it is possibie to atternate between washers and prctrusions, such thatwashers are used for every second joint white protrusions are used for theotherjoints, as itiustrated et the teft hand portion of Fig. Bb.

Aiternativeiy, or as a compiement, it is possibie to use washers formore than ttrvo adjacent heat exchanger members, white protrusions are usedfor one or a few of the heat exchanger members.

Referring to Figs 4a-4b, there is iiiustrated how the freedom in designcan be improved by making use of the present disciosure. in Fig. 4a, the inoorning cooiant ftow Fc and the outgoing cooiant fiowmove in substantiaiiy the same direction. Bott hoies 9 are provided on bothsides of a iongitudinai centre iine of the heat exchanger t. i-towever instead ofbeing atigned aiong a iine which is perpendicuiar to the centre iine, the bottnotes 9 are atigned aiong a iine, which present en angie ß different than §0°reiative to the iongitudirtai centre iine. The angie may be iess than about Sofi,iess than about 70°, tess than about 60% iess than about 50°, iess than about49% or iess than about 309 At ieast one oii 3, 4 port may aiso be aiigned onthe same iine as the bott hotes 9. in Figs 4a, 4b, there is defined a iongitudinai centre iine through thecenters of the oii ports. Angie ß is thus an absoiute angie for the position ofeach set of aiigned through notes. A difference angle 9 between the hoiesmay be defined. Where the hoies are atigned atong a singie iine through thecentre of the oii port, the difference angie Q wiii be 180 degrees. in Fig. 4b, there is iiiustrated an embodiment where the incomingcooiant fiow Fc arrives at an engie to the iongituciinai centre iine of the heatexchanger t, and where the outgoing cooiant ftow Fc is substantiatty paratieiwith the iongitudinat centre iine. First and second pairs of bott hoies 9 may beprovided such that the angte ß at the centre of an oii port, between the iinesaicng which the respective pair of boit hotes 9 are aiigned differ bettfveen thepairs of bott hoies 9. if desired, further such sets of aiigned through hoies orboit notes may be provided at a respective oii port, eg. 3, 4 or 5 sets ofthrough hoies or bott hcies. 11 Referring to Figs 5a-5d, there are iiiustrated various protrusionlridgepatterns which may be used in connection with oii ports 3, 4 and/or accesshoieslaccornmodation recesses.

Referring to Figs Sa-öb, there is iiiustrated how the protrusioníridgepattern may differ between a pair of ioined together heat exchanger members10. As iiiustrated, a first ridge 180' of a first heat exchahger piate 18' mayextend in a first direction, white a second ridge 170” of a second heatexchanger member 17' may extend in a second, different direction. The firstand second directions may be substantiaiiy mutuaiiy perpendicuiar. Howeverany angie betvveen u” and 961* may be provided betrween the ridges of theadiacent heat exchanger members 10.

Fig. T shows a heat exchanger formed by a piuraiity of heat exchangermembers tüma, tumb, each of which is formed as a substantiaiiy tubuiarmember. Each member may be formed by rotting or foiding a piece of sheetmetai or by extrusion. in either case, the forming of the tubuiar member maybe foiiowed by a fiattening step andlor by insertion of an additionai fiangestructure to increase heat transfer, The heat exchanger may be formed as iiiustrated by a piuraiity ofidenticai heat exchanger members. Fig. 8 iiiustratee an embodirnent, whereinthe through hoie 9” intersects the edge portion of the heat exchanger member101V. The through hoie presents a centra! angie o, the iegs of whichpresenting a respective tangent point which may coincide with the intersectionbetween the respective edge portion an the the hoie edge, The centret angiemay be iess than about 180 degrees, iess than about 135 degrees or iessthan about 90 degrees. in this connection “centraP is to be seen as thegeometric centre where the hoie is substantiaiiy circuiar or substantiaiiyeiiiptic, or as the centre of gravity of the through hoie where the through hoieis asyrnrnetric.

Claims (28)

1. 2G 12CLAEMS 1. A heat exchanger for an oil cooler, comprising: at least two heat exchanger members (19) each enclosing a respectivefirst channel (12); Wherein a second channel (7) is formed behNeen the at least two heatexchanger members (1G); characterized lnthat at least one of the heat exchanger members presents through hole (9,11) providing access from outside the heat exohanger to the second channel <7).

2. The heat exchanger as claimed in claim t, vvherein the through hole is spaced from all peripheral edges of the heat exchanger member (10).

3. The heat exchanger as claimed in claim 1, wherein an edge defining the through hole intersects an edge of the heatexchanger at a respective point of intersection, the through hole presents a central angle, the legs of which presentinga respective tangent point at the respective point of intersection, and the central angle is less than about 180 degrees, less than about 135 degrees or less than about 90 degrees.

4, The heat exchanger as ciaimed in any one of the precedingclaims, whereln heat exchanger piates of tvvo separate heat exohangermembers, which heat exchanger plates face each other, present at least onerespective protrusion (176, 189; 17G”, 180), arranged in the irnmediate vicinityof the through hole (9, 11) andior of an oil port (3, 4), and wherein the protrusions ahut each other.

5. The heat exchanger as claimed in clalm 4, whereln the heatexohanger piates facing each other present a piuraiity of abutting protrusioris. 2G 13å.

The heat exohanger as ciaimed in oiaim 4 or 5, wherein at ieast one of the protrusions is formed as a ridge.

7. The heat exchanger as oiaimed in any one of ciairns 4-6, vvherein at ieast tvvo of the protrusions have different shapes.

8. The heat exchanger as ciaimed in any one of ciaims 4-7, wherein the abutting protrusions are joined with each other.

9. The heat exchanger as ciaimed in any one of ciaims 4-8,wherein the heat exchanger comprises: a third heat exchanger member, arranged adjaoent one of the tvvc heatexchanger members, and having a through hoie which is aiigned with theother through hoies aiong a normai of a main piane of the heat exohangermembers, wherein at ieast one washer is arranged between the third heatexchanger member and said one of the tvvo heat exchanger members.

10. The heat exchanger member as ciairned in any one of thepreceding ciaims, wherein at ieast two heat exchanger members present arespective through hoie, and wherein said respective through hoies at ieast partiaiiy overiap each other, thus forming a set of overiapping through hoies,

11. The heat exchanger as ciaimed in ciaim 10, further comprisingat ieast one mounting member presenting a mcunting hoie which is accessibie through the overiapping through hoies.

12. The heat exchanger as ciaimed in any one of ciairns 1-9,wherein iess than aii heat exchanger members of the heat exchanger present a respective through hoie. 1G 2G 36 1413.

The heat exchahger as ciaimed in any one of ciairns 18-12, wherein a through hoie of one of the heat exchanger members is srnaiier than an overiapping through hoie of another one of the heat exchanger members.

14. The heat exchanger as ciaimed in any one of the precedingciaims, wherein the through hoies are substantiaiiy aiigned with each otheraiong a normai of a main piane of the heat exchanger members, thus forminga set of aiigned through hoies.

15. The heat exchanger as claimed in ciaim 14, wherein a first set of aiigned through hoies is arranged at a first angie reiative toa iongitudinai centre Eine through centers of oii ports of the heat exchangerand a first distance from the centre of a first oii port, and a second set of aiigned through hoies is arranged at a second angiereiative to the iongitudinai centre itne and a second distance from the centreof the first oii port. 18.

The heat exchanger as ciaimed in ciairn 15, wherein the first and second distances are substantiaiiy eguai.

17. The heat exchanger as ciairned in ciaim 15 or 18, wherein the first and second angies differ by about 180 degrees.

18. The heat exchanger as ciaimed in ciaim 15 or 17, wherein thefirst and second angies differ by iess than 180 degrees, iess than about 135degrees or iess than about 90 degrees.

19. The heat exchanger as ciaimed in ciaim 15 or 17, wherein thefirst and second angies differ by more than 188 degrees, more than about 225 degrees or more than about 270 degrees. 28.

The heat exchanger as ciaimed in any one of ciaims 14-19,wherein a first set of aiigned through hoies is arranged on a first side of aiongitudinai centre iine through centers of oi! ports of the heat exchanger and 'iQ 3G a second set of aiigned through hoies is arranged on a second side of the iongitudinai centre line.

21. The heat exchanger as ciaimed in ciairn 20, wherein atransversai iine running through the centers of both sets of aiigned through hoies is substantiaiiy perpendicuiar to the iongitudinai centre iine.

22. The heat exchanger as ciairned in ciaim 2G wherein atransversai Eine running through the centers of both sets of aiigned throughhoies presents an angie of iess than about 90 degrees to the iongitudinaicentre iine, or iess than about 75 degrees, or iess than about êfi degrees or iess than about 45 degrees.

23. The heat exchanger as ciaimed in ciaim 21 or 22, wherein the transversai iine intersects an oii port.

24. The heat exchanger as clairned in any one of the precedingciaims, wherein at ieast one of the heat exchanger members presents at ieasttwo through hoies (9, 11) providing access from outside the heat exohanger to the second channei (T).

25. A heat exchanger for an oii cooier, comprising: at ieast three stacked heat exohanger members (fu) each enciosing arespective first channei (12); wherein a respective second channei (7) is formed between twoadjacent ones of said heat exchanger members (10); wherein an oii port extends through the heat exchanger members andconnects the respective first channeis (12); wherein surfaces of a first pair of adiacent heat exchanger members,which surfaces face each other and form an associated second channei,present at ieast one respective protrusion (179, 189; 1702 1803, arranged inthe imrnediate vicinity of the oii port, and wherein the protrusions abut each other; and 1G towherein a second pair ot adiaoent heat exohanger members is separated by at teast one substantiaiiy btanar member, such as a washer, extending about a substantiai part of a oiroumterenoe of the oii port.

26. An oii oooiing system, oomprising: a oavity (8) having a iiquid oooting medium intet (SG) and a tiquidoooting medium outtet (50); an oi! (4) iniet for oii to be oooted and an oit outiet (3) for oooied oii; and a heat exohanger (10, 1G), as oiaimed in any one ot the preoedingoiaims, said heat exohanger being substantiatiy enoiosed in said oavity (8).

27. The oit oooiing system as oiaimed in otaim 26, wherein the second ohannei is at teast partiaiiy formed by the oavity.

28. A method for oooting oii in a vehioie using an oit oooiing systemas oiairned in oiaim 2§ or 27, the method oomprising: oausing oii to be oooied to fiow from the oit intet (4) through the firstohannei (12) to the oii outiet (3), and causing iiquid oooting medium to fiow from the oooting medium intet(69) through the second ohannei (7) to the oooiing medium outiet (50).