CA1217762A - Heat exchanger plate - Google Patents
Heat exchanger plateInfo
- Publication number
- CA1217762A CA1217762A CA000436673A CA436673A CA1217762A CA 1217762 A CA1217762 A CA 1217762A CA 000436673 A CA000436673 A CA 000436673A CA 436673 A CA436673 A CA 436673A CA 1217762 A CA1217762 A CA 1217762A
- Authority
- CA
- Canada
- Prior art keywords
- plate
- ridges
- adjacent
- supporting points
- passage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention provides a plate for a plate heat exchanger, provided with a corrugation pattern of ridges and grooves arranged to rest intersectingly against the cor-rugation pattern of an adjacent plate such that a large number of supporting points are formed, at least on one side thereof the plate has ridges provided with recessed parts arranged in the areas of the supporting points, whereby in an adjacent heat exchanging passage the number of supporting points, gen-erating convection or turbulence and consequently also the flow resistance, are reduced. The heat exchanger plate makes it possible to adapt the flow characteristics of the passage to mutual flows of unequal size of the two heat exchanging media under essential retention of area enlarging effect of the corrugation.
The present invention provides a plate for a plate heat exchanger, provided with a corrugation pattern of ridges and grooves arranged to rest intersectingly against the cor-rugation pattern of an adjacent plate such that a large number of supporting points are formed, at least on one side thereof the plate has ridges provided with recessed parts arranged in the areas of the supporting points, whereby in an adjacent heat exchanging passage the number of supporting points, gen-erating convection or turbulence and consequently also the flow resistance, are reduced. The heat exchanger plate makes it possible to adapt the flow characteristics of the passage to mutual flows of unequal size of the two heat exchanging media under essential retention of area enlarging effect of the corrugation.
Description
'7'~
This invention relates to a plate for a plate heat exchanger provided with a corrugation pattern of rid~es and grooves arranged to rest intersect~ngly against the corruga-tion pattern of an adjacent plate such that a great number of supportin~ points are formed. The function of the supporting points partly ~s to absorb compressive forces and partly to generate turbulence or increased convection, usually followed by increased pressure drop.
In heat exchangers built up by plates with mutual in-tersecting corrugations it is known to change the flow resis-tance of the heat exchange passages and consequently also the so called thermal length by varying the press depth and the mutual angle of the corrugations of adjacent plates and by combining different press depths and angles. The possibilities to influence the flow characteristics of the passages with such arrangements, however, are limited to changçs equal in size of the passages for the two media. A change of the passages for one of the media thus causes a corresponding change of the passages for the other medium.
The above mentioned limitation is a drawback since it is somet~mes desirable to be able to bring a~out asymmetri-cal passages, i.e. to change the flow characteristics of the passages or the two media independently of each other, for instance when having the same type of medium in liquid state and the same allowed pressure drop and essentially the same ~iscos~t~ and when the flows of the media are unequal in size, i.e. when the task of the heat exchange is asymmetri-cal. The heat exchanger in this example must be dimensioned fox that medium that has the largest flow such that desired pressure dxop is achieved in the passages through which this medium passes~ Due to th~s fact the passages for the other medium, ~hich have the same capacity, will be over-dimensioned for the actual flow. Which medium that becomes limiting de-7~;~
pends on the size of flow, state of aggregation, the highestallowed pressure drop, type of fluid etc. Thus, also during conderlsation and/or evaporation the passages for one of the media usually becomes limiting, while the upper limlt of the pressure drop for the other medium cannot be utilized. Acco~dingly, the h~at exchan~ing surfaces of the apparatus are not utilized in the best way, which is unfavourable from an economic point of view.
In o~der to master this problem heat exchanger plates have been suggested provided with an unsymmetrical corrugation pattern having narrow ridges and wide grooves or vice versa.
~y means of such plates it is possible to bring about a heat exchanger, in which the passages for the two media have mutual different volume and consequeritly different flow characteristics.
l'he difference in flow characteristics achieved in this way, however, is small at the same time as the area enlargement of the pattern has to be reduced. Therefore, this solution has appeared not to be so suitable in practice.
The present invention provides a plate for a plate heat exchanger, provided with a corrugation pattern or ridges and alternating grooves ar~anged to rest intersectingly against the corrugation pattern of an adjacent plate such that a great number of mutual supporting points is formed, in which at least on one side the plate has ridges provided with locally recessed parts arranged in the areas of intersection with cooperating ridges of an adjacent plate, whereby in an adjacent heat exchanging passage formed between two plates, the number of supporting points, generating convection or turbulence and consequently also the flow resistance; is ~educed.
According to the present invention therefore, there is provided a plate for a plate heat exchanger, provided with a corrugation pattern Of ridges and grooves arranged to rest intersectingly against tAe corrugation pattern of an adjacent ?
~ - 2 -~2~7~2 plate such that a large number of supporting points are formed, at least on one side thereof the plate has ridges provided with recesscd parts arranged in the areas of the supporting points, whereby in an adjacent heat exchanging passage the number of supporting points, generatiny convection or tu~bulence and con-sequently also the flow resistance, are reduced.
The present invention also provides in a plate heat exchanger, the combination comprising two adjacent plates de-fining a passage for flow of a heat exchanging medium, each of said two plates having a central plane and a corrugation pattern forming ridges projecting in opposite directions from said central plane, the ridges on each face of the plate being paral-lel to the ridges on the opposite face of the plate and formlng parallel grooves in said opposite face of the plate, the ridges and grooves of each plate crossing ridges and grooves of the other plate, each plate having first regions where a plurality of ridges of the plate engage a plurality of crossing ridges of the adjacent plate to form a substantial number of supporting pGints in said passage, ridges of at least one plate having recesses at selected second regions where a plurality of ridges of said one plate would engage a plurality of crossing ridges of the adjacent plate except for saia re~esses, whereby said number of supporting points in said passage is less than it would have been without said recesses.
The invention is further described with reference to the accompanying drawings, in which:-, ~ Fig.s 1 and 2 show a section and a plan view res-^~:
pectively of a fragment of a series of heat exchanger plates according to the invention; and Fig.s 3-6 show corresponding views of other embodi-ments of the invention.
~- 3 -.~ Z~Lt7 7~;~
Fig. 1 shows fragments of three identical plates 1, of which the intermediate one is turned 180 aLound its longi-tudinal axis in order to bring about a mutual intersecting corru-gation pattern, which forms supporting points 2, in which the plates rest against each other. As is revealed in the best way in Fig. 2, the grooves 3 are running uninter~uptediy, while the ridges 4 are provided with recesses 5 approximately positioned flush with the central plane of the plate. The recesses 5 are arranged in line with each other. As is revealed in Fig. 1 the recesses 5 are positioned on such places where corrugation ridges turned to each other intersect each other, whereby the number of supporting points are reduced in the passages 7. In the em~odiment according to Fig.s 1 and 2 every third supporting point is eliminated. Due to this fact, a substantial reduction of the pressure drop is achieved ~ ~ - 3a -in eyer~ second heat exchanging passage.
In the passages ~or the other medium, which are represented b~ the lower passage 8 in Fig. l, the number of supporting points is not reduced and, therefore, the flow characteristics are changed in a substantially less extension, but since the volu~e of the passages is reduced, their flow resis ~ ce will usually increase to some extent.
In ~i~s. 3 and 4 plates ll are shown that are ar-ranged in the same way as are the plates l in Figs. l and
This invention relates to a plate for a plate heat exchanger provided with a corrugation pattern of rid~es and grooves arranged to rest intersect~ngly against the corruga-tion pattern of an adjacent plate such that a great number of supportin~ points are formed. The function of the supporting points partly ~s to absorb compressive forces and partly to generate turbulence or increased convection, usually followed by increased pressure drop.
In heat exchangers built up by plates with mutual in-tersecting corrugations it is known to change the flow resis-tance of the heat exchange passages and consequently also the so called thermal length by varying the press depth and the mutual angle of the corrugations of adjacent plates and by combining different press depths and angles. The possibilities to influence the flow characteristics of the passages with such arrangements, however, are limited to changçs equal in size of the passages for the two media. A change of the passages for one of the media thus causes a corresponding change of the passages for the other medium.
The above mentioned limitation is a drawback since it is somet~mes desirable to be able to bring a~out asymmetri-cal passages, i.e. to change the flow characteristics of the passages or the two media independently of each other, for instance when having the same type of medium in liquid state and the same allowed pressure drop and essentially the same ~iscos~t~ and when the flows of the media are unequal in size, i.e. when the task of the heat exchange is asymmetri-cal. The heat exchanger in this example must be dimensioned fox that medium that has the largest flow such that desired pressure dxop is achieved in the passages through which this medium passes~ Due to th~s fact the passages for the other medium, ~hich have the same capacity, will be over-dimensioned for the actual flow. Which medium that becomes limiting de-7~;~
pends on the size of flow, state of aggregation, the highestallowed pressure drop, type of fluid etc. Thus, also during conderlsation and/or evaporation the passages for one of the media usually becomes limiting, while the upper limlt of the pressure drop for the other medium cannot be utilized. Acco~dingly, the h~at exchan~ing surfaces of the apparatus are not utilized in the best way, which is unfavourable from an economic point of view.
In o~der to master this problem heat exchanger plates have been suggested provided with an unsymmetrical corrugation pattern having narrow ridges and wide grooves or vice versa.
~y means of such plates it is possible to bring about a heat exchanger, in which the passages for the two media have mutual different volume and consequeritly different flow characteristics.
l'he difference in flow characteristics achieved in this way, however, is small at the same time as the area enlargement of the pattern has to be reduced. Therefore, this solution has appeared not to be so suitable in practice.
The present invention provides a plate for a plate heat exchanger, provided with a corrugation pattern or ridges and alternating grooves ar~anged to rest intersectingly against the corrugation pattern of an adjacent plate such that a great number of mutual supporting points is formed, in which at least on one side the plate has ridges provided with locally recessed parts arranged in the areas of intersection with cooperating ridges of an adjacent plate, whereby in an adjacent heat exchanging passage formed between two plates, the number of supporting points, generating convection or turbulence and consequently also the flow resistance; is ~educed.
According to the present invention therefore, there is provided a plate for a plate heat exchanger, provided with a corrugation pattern Of ridges and grooves arranged to rest intersectingly against tAe corrugation pattern of an adjacent ?
~ - 2 -~2~7~2 plate such that a large number of supporting points are formed, at least on one side thereof the plate has ridges provided with recesscd parts arranged in the areas of the supporting points, whereby in an adjacent heat exchanging passage the number of supporting points, generatiny convection or tu~bulence and con-sequently also the flow resistance, are reduced.
The present invention also provides in a plate heat exchanger, the combination comprising two adjacent plates de-fining a passage for flow of a heat exchanging medium, each of said two plates having a central plane and a corrugation pattern forming ridges projecting in opposite directions from said central plane, the ridges on each face of the plate being paral-lel to the ridges on the opposite face of the plate and formlng parallel grooves in said opposite face of the plate, the ridges and grooves of each plate crossing ridges and grooves of the other plate, each plate having first regions where a plurality of ridges of the plate engage a plurality of crossing ridges of the adjacent plate to form a substantial number of supporting pGints in said passage, ridges of at least one plate having recesses at selected second regions where a plurality of ridges of said one plate would engage a plurality of crossing ridges of the adjacent plate except for saia re~esses, whereby said number of supporting points in said passage is less than it would have been without said recesses.
The invention is further described with reference to the accompanying drawings, in which:-, ~ Fig.s 1 and 2 show a section and a plan view res-^~:
pectively of a fragment of a series of heat exchanger plates according to the invention; and Fig.s 3-6 show corresponding views of other embodi-ments of the invention.
~- 3 -.~ Z~Lt7 7~;~
Fig. 1 shows fragments of three identical plates 1, of which the intermediate one is turned 180 aLound its longi-tudinal axis in order to bring about a mutual intersecting corru-gation pattern, which forms supporting points 2, in which the plates rest against each other. As is revealed in the best way in Fig. 2, the grooves 3 are running uninter~uptediy, while the ridges 4 are provided with recesses 5 approximately positioned flush with the central plane of the plate. The recesses 5 are arranged in line with each other. As is revealed in Fig. 1 the recesses 5 are positioned on such places where corrugation ridges turned to each other intersect each other, whereby the number of supporting points are reduced in the passages 7. In the em~odiment according to Fig.s 1 and 2 every third supporting point is eliminated. Due to this fact, a substantial reduction of the pressure drop is achieved ~ ~ - 3a -in eyer~ second heat exchanging passage.
In the passages ~or the other medium, which are represented b~ the lower passage 8 in Fig. l, the number of supporting points is not reduced and, therefore, the flow characteristics are changed in a substantially less extension, but since the volu~e of the passages is reduced, their flow resis ~ ce will usually increase to some extent.
In ~i~s. 3 and 4 plates ll are shown that are ar-ranged in the same way as are the plates l in Figs. l and
2 but differ from those by being provided with deeper recesses 15, the depth of which corresponds to the whole embossing depth of the plates. ~ue to this fact the recesses 15 form continu-ous resting lines, which bring about a division of the passages 18 into several parallel part passages. Such a division is advantageous in order to prevent flow instability, unbalanced distribution or undesirable flow distribution, which under certain circumstances particularly in connection with evapora-tion or condensation has a tendency to appear, since the width of the heat exchanging passage is too large in relation to its thickness and length. The division into part passages has also that adyantage that the flow speed in the part passages can he influenced to increase or to be reduced and generally for guaranteeing a flow, for instance in condensate outlets or ex-haust ~as channels in a condensor. The tightness over the resting lines can be secured for instance by glueing, solder-ing or welding or by means of gaskets.
In order to bring about a good distribution of the flow between the different part passages it is in this connec-tion suitable to arrange restrictions of the flow, which in a way known of those skilled in the art, can be brought about by means of so~e suitable form of area restriction, as small inlet and outlet openings or particular restriction means put into suitable places in the passages. The restrictions as to 77~
evaporators of different types and boilers are suitably placed ~n the inlet of each part passage and as to condensors in the outlets of non-condensable gases and/or condensate.
In that in Figs. 5 and 6 disclosed embodiment two plates 11 accordin~ to Plg. 3 have been combined with an inter-mediate conventional plate 20 without recesses. Due to that fact has been formed a passage 27 with reduced number of sup-porting points 22, and a passage 28 with retained number of supporting points but without longitudinal resting lines.
~t is easily perceived that besides the above de-scribed embodiments many changes of the recesses are possible as to form, d~mensions and orientation over the surface of the plate. By the disclosed placement of the recesses in rows in the longitudinal direction of the plate, the pressure drop sinking effect is strengthened, but the recesses can have any arbitrary placement, which in each particular case can appear to be suitable of resistance reasons or flow-technical reasons.
They can for instance be arranged in rows across or obliquely against the longitudinal direction of the plate or in inter-rupted rows in some oneof these directions or not at all in line.
In order to bring about a good distribution of the flow between the different part passages it is in this connec-tion suitable to arrange restrictions of the flow, which in a way known of those skilled in the art, can be brought about by means of so~e suitable form of area restriction, as small inlet and outlet openings or particular restriction means put into suitable places in the passages. The restrictions as to 77~
evaporators of different types and boilers are suitably placed ~n the inlet of each part passage and as to condensors in the outlets of non-condensable gases and/or condensate.
In that in Figs. 5 and 6 disclosed embodiment two plates 11 accordin~ to Plg. 3 have been combined with an inter-mediate conventional plate 20 without recesses. Due to that fact has been formed a passage 27 with reduced number of sup-porting points 22, and a passage 28 with retained number of supporting points but without longitudinal resting lines.
~t is easily perceived that besides the above de-scribed embodiments many changes of the recesses are possible as to form, d~mensions and orientation over the surface of the plate. By the disclosed placement of the recesses in rows in the longitudinal direction of the plate, the pressure drop sinking effect is strengthened, but the recesses can have any arbitrary placement, which in each particular case can appear to be suitable of resistance reasons or flow-technical reasons.
They can for instance be arranged in rows across or obliquely against the longitudinal direction of the plate or in inter-rupted rows in some oneof these directions or not at all in line.
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A plate for a plate heat exchanger, provided with a corrugation pattern of ridges and alternating grooves arranged to rest intersectingly against the corrugation pattern of an adjacent plate such that a great number of mutual supporting points is formed, in which at least on one side the plate has ridges provided with locally recessed parts arranged in the areas of intersection with cooperating ridges of an adjacent plate, whereby in an adjacent heat exchanging passage formed between two plates, the number of supporting points, generating convection or turbulence and consequently also the flow resistance, is reduced.
2. A plate according to claim 1, in which the re-cessed parts of the plate are arranged in line with each other along one or several lines.
3. A plate according to claim 2, in which the re-cessed parts are arranged in interrupted rows.
4. A plate according to claim 1, 2 or 3, in which the recessed parts are arranged in line with each other in the longitudinal or transversal direction of the plate.
5. A plate according to claim 1, 2 or 3, in which the recessed parts have a depth corresponding to a part of the embossing depth of the plate.
6. A plate according to claim 1, in which the reces-sed parts have a depth corresponding to the whole embossing depth of the plate and are arranged in one or several rows in the longitudinal direction of the plate, whereby at least every second heat exchanging passage are divided into several paral-lel part passages.
7. In a plate heat exchanger, the combination com-prising two adjacent plates defining a passage for flow of a heat exchanging medium, each of said two plates having a central plane and a corrugation pattern forming ridges projecting in opposite directions from said central plane, the ridges on each face of the plate being parallel to the ridges on the opposite face of the plate and forming parallel grooves in said opposite face of the plate, the ridges and grooves of each plate crossing ridges and grooves of the other plate, each plate having first regions where a plurality of ridges of the plate engage a plurality of crossing ridges of the adjacent plate to form a substantial number of supporting points in said passage, ridges of at least one plate having recesses at selected second regions where a plurality of ridges of said one plate would engage a plurality of crossing ridges of the adjacent plate except for said recesses, whereby said number of supporting points in said pas-sage is less than it would have been without said recesses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000436673A CA1217762A (en) | 1983-09-14 | 1983-09-14 | Heat exchanger plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000436673A CA1217762A (en) | 1983-09-14 | 1983-09-14 | Heat exchanger plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1217762A true CA1217762A (en) | 1987-02-10 |
Family
ID=4126069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000436673A Expired CA1217762A (en) | 1983-09-14 | 1983-09-14 | Heat exchanger plate |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1217762A (en) |
-
1983
- 1983-09-14 CA CA000436673A patent/CA1217762A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |