EP3572753A1 - Wärmetauscher - Google Patents
Wärmetauscher Download PDFInfo
- Publication number
- EP3572753A1 EP3572753A1 EP18461559.9A EP18461559A EP3572753A1 EP 3572753 A1 EP3572753 A1 EP 3572753A1 EP 18461559 A EP18461559 A EP 18461559A EP 3572753 A1 EP3572753 A1 EP 3572753A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flow
- section
- passages
- flow section
- fluid
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims abstract description 82
- 239000003507 refrigerant Substances 0.000 description 27
- 239000002826 coolant Substances 0.000 description 22
- 238000005219 brazing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002747 voluntary effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/0093—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
Definitions
- the present invention relates to a heat exchanger, especially a heat exchanger with improved flow scheme of two working fluids.
- Prior art heat exchangers comprise a core, which defines two fluid circuits therein. A first working fluid flows through a first fluid circuit, while a second working fluid flows through a second fluid circuit. Both fluid circuits can be divided into one or more distinctive flow sections of different sizes, through which the working fluids can flow in the same or opposing directions. Examples of such heat exchangers are disclosed in DE 10 2016 001 607 A1 , US 2017/0122669 A1 , US 2016/0010929 A1 , US 2015/0226469 A1 or US 2013/0213624 A1 .
- the cores of the heat exchangers known from the prior art are divided into many flow sections to increase power output and heat exchange efficiency. Such configuration, however, results in significant pressure drops of the working fluids, which is unacceptable in some applications. Moreover, the larger the number of the flow sections, the larger the size and complexity of the heat exchanger. Very often, in known heat exchangers each successive flow section is narrower that a preceding one and this leads to the increase in flow resistance and pressure drops.
- One aim of the present invention is to provide a heat exchanger with a limited number of flow passages but at the same with unchanged heat exchange efficiency.
- Another aim of the present invention is to provide a heat exchanger with increased power output and pressure drop values kept at an acceptable level.
- a heat exchanger comprises a core.
- the core defines a first fluid circuit and a second fluid circuit.
- the first fluid circuit includes one flow section through which a first fluid flows in one direction.
- the second fluid circuit is divided into flow sections, which are in fluid communication to one another and through which a second fluid flows in different directions.
- the one flow section of the first fluid circuit and the flow sections of the second fluid circuit are defined by a plurality of flow passages.
- the second fluid circuit is divided into a first flow section, a second flow section and a third flow section.
- the first, second and third flow sections are configured so that the first flow section is in fluid communication with the second flow section and the second fluid section is in fluid communication with the third flow section and a direction of flow in the first and third flow sections is opposite to the direction of flow in the one flow section of the first fluid circuit and a direction of flow in the second flow section is the same as the direction of flow in the one flow section of the first fluid circuit.
- a number of the flow passages of the third flow section is greater than a number of the flow passages of the second flow section and the number of the flow passages of the third flow section is smaller than or equal to a number of the flow passages in the first flow section.
- the present invention ensures that as much as possible of the flow of the second fluid is in counter-flow with the first fluid, which increases heat exchange efficiency. Simultaneously, although the number of the flow passages of the second flow section for the second fluid is as low as possible pressure drops of the second fluid are kept at an acceptable level.
- the power output of a heat exchanger adopting the principles of the present invention is significantly increased, even by 350-620 W.
- the heat exchanger according to the present invention comprises a reduced number of flow passages compared to the heat exchangers known from the prior art, while maintaining or improving basis properties of the heat exchanger like power output, heat exchange efficiency, etc. It also means the heat exchanger according to the present invention is cheaper.
- the present invention can easily be applied to heat exchangers adopting different types of cores, for example cores made of shaped plates and/or flat hollow flow tubes.
- a heat exchanger 1 of the present invention comprises a core 2 where heat exchange between two fluids takes place.
- the heat exchanger 1 also comprises a plurality of inlet and outlet ports 3 to deliver a coolant/first fluid and a refrigerant/second fluid to and out of the core 2.
- the core 2 defines therein two fluid circuits, namely a first fluid circuit for the coolant and a second fluid circuit for the refrigerant. Both fluid circuits are fluidly separated from each other. It means that both fluids do not mix.
- the core 2 includes a plurality of shaped plates 4 stacked on top of one another. Each pair of two adjacent shaped plates 4 define a flow passage 5 therebetween.
- the first and second fluids, coolant and refrigerant respectively, flow through the flow passages 5.
- the flow passages should be used alternatively, namely a first flow passage for the first fluid, a second flow passage for the second fluid, a third flow passage for the first fluid, etc.
- the shaped plate 4 comprises a bottom 41 and a peripheral wall 42 protruding from the bottom 41.
- the shaped plate 4 is provided at both its ends with openings 43.
- the openings 43 of the stacked shaped plates 4 define vertical channels throughout the core 2.
- the vertical channels formed by the openings 43 are in fluid communication with selected flow passages 5 formed between the shaped plates 4.
- the shaped plate 4 comprises a number of additional features.
- the shaped plate 4 can comprise a ridge 44 enclosing one or more openings 43. When the shaped plates 4 are stacked the ridge 44 of one shaped plate 4 is in sealed contact with the shaped plate 4 located above it.
- a fluid flowing through the opening 43 enclosed by the ridge 44 cannot flow into the flow passage 5 shown in fig. 2a and can only flow in a vertical direction of the core 2.
- the configuration of the ridge 44 is changed so that it no longer encloses the opening 43 concerned, see fig. 2b .
- the opening 43 is encircled by a series of spaced-apart protrusions 45, which allow the fluid to flow therebetween, or even the opening 43 may not be obscured by additional elements so that the opening 43 is in fluid communication with the flow passage 5.
- the openings 43 of the outermost shaped plates 4 can be connected to the inlet and outlet ports 3.
- the openings 43 can be closed by plugs or even may not be present in the shaped plates 4.
- the number of the openings 43 as well as their position and configuration at both longitudinal ends of the shaped plates 4 can be chosen voluntary, depending on the configuration of the core 2 and a flow scheme to be obtained. With the core 2 formed in this way the first and second fluids do not mix and they flow in respective fluid passages 5 formed between the shaped plates 4.
- the core 2 defines two fluid circuits.
- One fluid circuit is used for the coolant/first fluid, while the other is used for the refrigerant.
- the coolant flow is shown in figs. 3 and 4 .
- This fluid circuit comprises only one flow section C, which includes a plurality of the flow passages 5 to be passed by the coolant.
- the coolant flows into the core 2 at one of its longitudinal ends, flows through one of the vertical channels and then is directed longitudinally to all flow passages 5 intended to be passed by the coolant.
- the coolant flows through all related flow passage 5 in the same one direction.
- the coolant is directed to one vertical channel at the other longitudinal end of the core 2 and is subsequently discharged out of the core 2.
- the coolant may flow into and out of the core 2 at two opposite longitudinal ends of the core 2, but depending on the external configuration of the heat exchanger 1 the coolant can flow into and out of the core at the same end of the core 2.
- the core 2 can be provided with an additional bypass 21, which directs the coolant from one longitudinal end of the core 2 to the other.
- Figs. 5 and 6 show schematically the flow of the refrigerant/second fluid.
- the core 2 can virtually be divided into three flow sections R1, R2, R3.
- Each of the flow sections R1, R2, R3 comprises a plurality of the flow passages 5 to be passed by the refrigerant.
- the flow sections R1, R2, R3 jointly coincide with one flow section C shown in figs. 3 and 4 .
- the flow sections R1, R2, R3 are defined by an appropriate configuration of a set of the openings 43.
- the flow section R1 is in fluid communication with the flow section R2 and the flow section R2 is in fluid communication with the flow section R3.
- one can say that one flow section is in fluid communication with a preceding flow section (if present) and a subsequent flow section (if present).
- the refrigerant enters first the flow section R1, flows longitudinally through the flow section R1 and its all flow passages 5 in one direction and then flows through one of the vertical channels into the flow section R2.
- the refrigerant flows longitudinally through the flow section R2 and its all flow passages 5 in one direction, which is opposite to the direction of flow in the flow section R1.
- the refrigerant is directed through one vertical channel at the other longitudinal end of the core/flow section R2, opposite to the end where the refrigerant enters the flow section R2, to the flow section R3.
- the refrigerant flows longitudinally through the flow section R3 and its all flow passages 5 in one direction, which is opposite to the direction of flow in the flow section R2 and is the same as the direction of flow in the flow section R1.
- the refrigerant depending on the external configuration of the heat exchanger 1, especially its inlet and outlet ports 3, can be discharged out of the core 2 either directly at the flow section R3 or the refrigerant can be directed by one of the vertical channels, which is not in fluid communication with the flow passages 5 of the flow sections R1 and R2, through the flow sections R1 and R2 and can flow out of the core 2 at the flow section R1, as shown in figs. 5 and 6 .
- the coolant flows longitudinally through the core 2 only in one direction, whereas the refrigerant flows longitudinally through the core 2 in two opposing directions.
- the direction of flow of the refrigerant in the flow section R1 is opposite to the direction of flow of the coolant in the flow section C.
- the direction of flow of the refrigerant in the flow section R2 is the same as the direction of flow of the coolant in the flow section C.
- the direction of flow of the refrigerant in the flow section R3 is opposite to the direction of flow of the coolant in the flow section C.
- the refrigerant in the flow sections R1 and R3 is in counter-flow compared to the coolant in the flow section C.
- the refrigerant in the flow section R2 is in common flow compared to the coolant in the flow section C.
- the number NR2 of the flow passages 5 in the flow section R2 should be as low as possible to get acceptable pressure drop of the refrigerant and should be preferably 15-25 % of the total number TNR1R2R3 of the flow passages 5 passed by the refrigerant (namely total number TNR1R2R3 of the flow passages 5 in the flow sections R1, R2 and R3).
- the number NR3 of the flow passages 5 in the flow section R3 should be greater than the number NR2 of the flow passages 5 in the flow section R2.
- the total number TNR1R3 of the flow passages 5 in the flow sections R1 and R3 should be preferably 75-85 % of the total number TNR1R2R3 of the flow passages 5 passed by the refrigerant (total number TNR1R2R3 of the flow passages in the flow sections R1, R2 and R3).
- the number NR3 of the flow passages 5 in the flow section R3 should be the same or smaller that the number NR1 of the flow passages 5 in the flow section R1 and should be preferably 20-42,5 % of the total number TNR1R2R3 of the flow passages 5 passed by the refrigerant (namely total number TNR1R2R3 of the flow passages in the flow sections R1, R2 and R3).
- the ratio of the numbers of the flow passages 5 of the flow section R1/flow section R2/flow section R3, respectively is 9/6/9.
- the ratio of the numbers of the flow passages 5 of the flow section R1/flow section R2/flow section R3, respectively is 10/6/8 or 11/5/8.
- the present invention discussed above is not limited only to heat exchangers consisting of a plurality of shaped plates.
- the innovative principle of the present invention can be applied to heat exchangers, where flow passages are defined by, for example, a series of flat hollow flow tubes stacked in a pile and defining flow passages therein, a first set of the flat hollow flow tubes being passed by the coolant while the other being passed by the refrigerant.
- Another example is a heat exchanger, which incorporates a combination of flat hollow flow tubes and shaped plates.
- a first set of flow passages is defined inside the flat hollow flow tubes and a second set of flow passages is defined between successive shaped plates.
- the flat hollow flow tubes and the shaped plates are stacked in a pile so that one flat hollow flow tube is arranged between two successive shaped plates.
- the coolant flows, for example, through the flat hollow flow tubes and the refrigerant flows through passages defined by two successive shaped plates, or vice versa.
- the fluid circuit for the refrigerant can easily be divided into three sections with different directions of flow.
- all components of the heat exchanger 1 are made of materials suitable for brazing, for example aluminum and its alloys, and are connected to one another by brazing.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18461559.9A EP3572753B1 (de) | 2018-05-24 | 2018-05-24 | Wärmetauscher |
PCT/EP2019/062257 WO2019224042A1 (en) | 2018-05-24 | 2019-05-14 | Heat exchanger |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18461559.9A EP3572753B1 (de) | 2018-05-24 | 2018-05-24 | Wärmetauscher |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3572753A1 true EP3572753A1 (de) | 2019-11-27 |
EP3572753B1 EP3572753B1 (de) | 2020-12-16 |
Family
ID=62386332
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18461559.9A Active EP3572753B1 (de) | 2018-05-24 | 2018-05-24 | Wärmetauscher |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3572753B1 (de) |
WO (1) | WO2019224042A1 (de) |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008061362A1 (en) * | 2006-11-24 | 2008-05-29 | Dana Canada Corporation | Linked heat exchangers |
DE102012223722A1 (de) * | 2011-12-22 | 2013-06-27 | Behr Gmbh & Co. Kg | Effizienter innerer Wärmeübertrager |
US20130213624A1 (en) | 2012-02-20 | 2013-08-22 | Keihin Thermal Technology Corporation | Heat exchanger |
WO2014044520A1 (de) * | 2012-09-21 | 2014-03-27 | Behr Gmbh & Co. Kg | Kondensator |
WO2014184323A1 (de) * | 2013-05-16 | 2014-11-20 | Behr Gmbh & Co. Kg | Kondensator |
US20150226469A1 (en) | 2012-09-21 | 2015-08-13 | Mahle International Gmbh | Condenser |
US20160010929A1 (en) | 2013-02-27 | 2016-01-14 | Denso Corporation | Stacked heat exchanger |
DE102016001607A1 (de) | 2015-05-01 | 2016-11-03 | Modine Manufacturing Company | Flüssigkeit-zu-Kältemittel-Wärmetauscher und Verfahren zum betrieb desselben |
US20170122669A1 (en) | 2014-05-23 | 2017-05-04 | Denso Corporation | Stacked heat exchanger |
-
2018
- 2018-05-24 EP EP18461559.9A patent/EP3572753B1/de active Active
-
2019
- 2019-05-14 WO PCT/EP2019/062257 patent/WO2019224042A1/en active Application Filing
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008061362A1 (en) * | 2006-11-24 | 2008-05-29 | Dana Canada Corporation | Linked heat exchangers |
DE102012223722A1 (de) * | 2011-12-22 | 2013-06-27 | Behr Gmbh & Co. Kg | Effizienter innerer Wärmeübertrager |
US20130213624A1 (en) | 2012-02-20 | 2013-08-22 | Keihin Thermal Technology Corporation | Heat exchanger |
WO2014044520A1 (de) * | 2012-09-21 | 2014-03-27 | Behr Gmbh & Co. Kg | Kondensator |
US20150226469A1 (en) | 2012-09-21 | 2015-08-13 | Mahle International Gmbh | Condenser |
US20160010929A1 (en) | 2013-02-27 | 2016-01-14 | Denso Corporation | Stacked heat exchanger |
WO2014184323A1 (de) * | 2013-05-16 | 2014-11-20 | Behr Gmbh & Co. Kg | Kondensator |
US20170122669A1 (en) | 2014-05-23 | 2017-05-04 | Denso Corporation | Stacked heat exchanger |
DE102016001607A1 (de) | 2015-05-01 | 2016-11-03 | Modine Manufacturing Company | Flüssigkeit-zu-Kältemittel-Wärmetauscher und Verfahren zum betrieb desselben |
Also Published As
Publication number | Publication date |
---|---|
WO2019224042A1 (en) | 2019-11-28 |
EP3572753B1 (de) | 2020-12-16 |
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