US20120211215A1 - Vapor cooling heat exchanger - Google Patents
Vapor cooling heat exchanger Download PDFInfo
- Publication number
- US20120211215A1 US20120211215A1 US13/504,562 US201013504562A US2012211215A1 US 20120211215 A1 US20120211215 A1 US 20120211215A1 US 201013504562 A US201013504562 A US 201013504562A US 2012211215 A1 US2012211215 A1 US 2012211215A1
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- fin
- target fluid
- cooling target
- refrigerant
- passage
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- 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
- F28D9/0062—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 the conduits for one heat-exchange medium being formed by spaced plates with inserted elements
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- 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
- F28D9/02—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 the heat-exchange media travelling at an angle to one another
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/02—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by influencing fluid boundary
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/14—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by endowing the walls of conduits with zones of different degrees of conduction of heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/08—Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning
Definitions
- the present invention relates to an vapor cooling heat exchanger.
- a heat exchanger for an vapor cooling apparatus includes a cooling target fluid passage, in which cooling target fluid flows, and a refrigerant passage, in which liquid refrigerant for cooling the cooling target fluid flows. Heat exchange is brought about between the cooling target fluid passage and the refrigerant passage through a partition wall. In the heat exchanger, the liquid refrigerant flowing in the refrigerant passage cools the partition wall, which has been heated by the cooling target fluid, and is thus heated. When the temperature of the heat transmitting surface of the partition wall exceeds the saturation temperature of the liquid refrigerant, nucleate boiling, in which generation and departure of bubbles are repeated, is initiated on the wall surface of the partition wall. The cooling target fluid flowing in the cooling target fluid passage is thus cooled by using the boiling vaporization latent heat produced through the nucleate boiling.
- Patent Document 1 One such type of heat exchanger for an vapor cooling apparatus is disclosed in, for example, Patent Document 1.
- Patent Document 1 describes a plate fin type exhaust gas heat exchanger.
- the exhaust gas heat exchanger is configured by a necessary number of layers each including a fluid passage having a corrugated fin for increasing a heat transmission surface area.
- the layers are arranged between a pair of tube plates, which are partition walls, having a pair of spacer bars that close opposite sides of the tube plates.
- high-temperature fluid cooling target fluid
- low-temperature fluid liquid refrigerant
- an vapor cooling heat exchanger that includes a partition wall and a fin.
- the partition wall separates a cooling target fluid passage, in which cooling target fluid flows, from a refrigerant passage, in which refrigerant for cooling the cooling target fluid flows.
- the fin is arranged in the cooling target fluid passage and thermally connected to the partition wall.
- the fin includes a first fin and a second fin.
- the second fin decreases a local heat flux of the partition wall by a greater degree than the first fin does.
- the first fin and the second fin are arranged based on the relationship between the local heat flux of the partition wall and the critical heat flux of the refrigerant.
- the thickness of the second fin is greater than the thickness of the first fin.
- the second fin is arranged in an upstream portion of the cooling target fluid passage in the flow direction of the cooling target fluid where the local heat flux of the partition wall increases.
- the second fin is arranged in a zone of the cooling target fluid passage that corresponds to a downstream portion of the refrigerant passage in the flow direction of the refrigerant where the critical heat flux decreases.
- the cooling target fluid passage and the refrigerant passage are arranged side by side such that the flow direction of the cooling target fluid and the flow direction of the refrigerant cross each other.
- the second fin is arranged in an upstream portion of the cooling target fluid passage in the flow direction of the cooling target fluid that is a zone in the cooling target fluid passage that corresponds to a downstream portion of the refrigerant passage in the flow direction of the refrigerant.
- FIG. 1 is a perspective view schematically showing an vapor cooling heat exchanger according to a first embodiment of the present invention
- FIG. 2 is an exploded perspective view showing a heat exchanging portion of the heat exchanger illustrated in FIG. 1 ;
- FIG. 3A is a vertical cross-sectional view showing a second fin
- FIG. 3B is a vertical cross-sectional view showing a first fin
- FIG. 4 is a graph representing the relationship between positions in the flow directions in a cooling target fluid passage and the flow direction in a refrigerant passage and heat flux in the first embodiment
- FIG. 5 is an exploded perspective view showing a portion of a heat exchanging portion of a second embodiment
- FIG. 6 is a graph representing the relationship between positions in the flow direction in a cooling target fluid passage and the flow direction in a refrigerant passage and heat flux in the second embodiment
- FIG. 7 is an exploded perspective view showing a portion of a heat exchanging portion of a third embodiment
- FIG. 8 is a graph representing the relationship between positions in the flow direction in a cooling target fluid passage and heat flux in the third embodiment
- FIG. 9 is an exploded perspective view showing a portion of a heat exchanging portion of another embodiment.
- FIG. 10 is a graph representing the relationship between positions in the flow direction in a cooling target fluid passage and the flow direction in a refrigerant passage and heat flux in the embodiment illustrated in FIG. 9 ;
- FIG. 11 is an exploded perspective view showing a portion of a heat exchanging portion of another embodiment.
- FIG. 12 is a graph representing the relationship between positions in the flow direction in a cooling target fluid passage and the flow direction in a refrigerant passage and heat flux in the embodiment illustrated in FIG. 11 .
- the heat exchanger 11 for the EGR apparatus causes heat exchange between EGR gas serving as cooling target fluid and water (liquid refrigerant) serving as refrigerant, thus boiling some of the water to cool the EGR gas.
- a “forward-rearward direction”, an “upward-downward direction”, and a “leftward-rightward direction” are defined as represented by the corresponding arrows in FIG. 1 , unless otherwise specified.
- a heat exchanging portion 12 is received in a substantially rectangular box-like housing 11 a, which configures an outer casing for the heat exchanger 11 .
- a cooling target fluid inlet portion 14 is arranged forward of the heat exchanging portion 12 .
- a cooling target fluid outlet portion 15 is arranged rearward of the heat exchanging portion 12 .
- An inlet pipe 16 for introducing EGR gas into the cooling target fluid inlet portion 14 is connected to the front surface of the housing 11 a.
- An outlet pipe 17 for discharging the EGR gas out from the cooling target fluid outlet portion 15 is connected to the rear surface of the housing 11 a.
- the heat exchanger 11 is used with the inlet pipe 16 connected to the inlet of an EGR passage and the outlet pipe 17 connected to the outlet of the EGR passage.
- First ends 22 a of a refrigerant inlet pipe 22 which introduces water into the heat exchanging portion 12 of the housing 11 a, are drawn into the housing 11 a through the right surface of the housing 11 a, which is one of the opposite surfaces located between the front and rear surfaces.
- first ends 23 a of a refrigerant outlet pipe 23 which discharge water out from the heat exchanging portion 12 , are drawn into the housing 11 a through the left surface of the housing 11 a, which is the other one of the opposite surfaces located between the front and rear surfaces.
- the heat exchanging portion 12 includes a plurality of (in the first embodiment, three) passage defining bodies 18 .
- Each of the passage defining bodies 18 is configured by a first fin 31 and a second fin 30 , which are arranged between two flat partition walls 19 .
- a pair of spacer bars 20 close opposite sides of the partition walls 19 .
- the heat exchanging portion 12 includes a front wall 13 a joined to the front opening ends of the passage defining bodies 18 and a rear wall 13 b joined to the rear opening ends of the passage defining bodies 18 .
- the passage defining bodies 18 are joined to the front wall 13 a and the rear wall 13 b such that the corresponding partition walls 19 of the adjacent pairs of the passage defining bodies 18 are spaced apart at uniform intervals.
- each passage defining body 18 is arranged on the side corresponding to the cooling target fluid inlet portion 14 and the rear opening of the passage defining body 18 is located on the side corresponding to the cooling target fluid outlet portion 15 .
- the front wall 13 a has elongated holes 13 e, which are formed at positions corresponding to the passage defining bodies 18 to allow communication between the interior of the cooling target fluid inlet portion 14 and the front openings of the corresponding passage defining bodies 18 .
- the rear wall 13 b has elongated holes (not shown) formed at positions corresponding to the passage defining bodies 18 to allow communication between the interior of the cooling target fluid outlet portion 15 and the rear openings of the corresponding passage defining bodies 18 .
- EGR gas After flowing from the inlet pipe 16 into the cooling target fluid inlet portion 14 , EGR gas enters the passage defining bodies 18 from the front openings through the corresponding elongated holes 13 e in the front wall 13 a. The EGR gas flows out from the rear openings into the cooling target fluid outlet portion 15 through the corresponding elongated holes in the rear wall 13 b. The EGR gas is then directed to the outlet of the EGR passage through the outlet pipe 17 . As a result, with reference to FIG. 2 , the interior of each passage defining body 18 forms a cooling target fluid passage 21 , in which EGR gas flows.
- each one of the passage defining bodies 18 is the inlet for EGR gas into the corresponding cooling target fluid passage 21 .
- the portion corresponding to the inlet of each passage defining body 18 is an upstream portion 21 a of each of the corresponding cooling target fluid passage 21 in the flow direction of the EGR gas (as represented by arrow X 1 in FIG. 2 ).
- the rear opening of each passage defining body 18 is the outlet for the EGR gas from the corresponding cooling target fluid passage 21 .
- the portion corresponding to the outlet of each passage defining body 18 is a downstream portion 21 b of each of the corresponding cooling target fluid passage 21 in the flow direction of the EGR gas.
- the “upstream portion 21 a of each cooling target fluid passage 21 ” refers to a zone close to the inlet with respect to a middle portion in the flow direction in the cooling target fluid passage 21 .
- the “downstream portion 21 b of each cooling target fluid passage 21 ” refers to a zone close to the outlet with respect to the middle portion in the flow direction in the cooling target fluid passage 21 .
- a refrigerant passage 24 is defined between the opposing partition walls 19 of each adjacent pair of the passage defining bodies 18 .
- the front opening of each refrigerant passage 24 communicates with the corresponding one of the first ends 23 a of the refrigerant outlet pipe 23 through a hole formed in the front wall 13 a.
- the rear opening of the refrigerant passage 24 communicates with the corresponding one of the first ends 22 a of the refrigerant inlet pipe 22 through a hole 13 c formed in the rear wall 13 b.
- the opposite sides of each refrigerant passage 24 perpendicular to the front wall 13 a and the rear wall 13 b are closed by the left and right surfaces of the housing 11 a.
- the first ends 23 a of the refrigerant outlet pipe 23 face the front openings of the corresponding refrigerant passages 24 .
- the first ends 22 a of the refrigerant inlet pipe 22 face the rear openings of the corresponding refrigerant passages 24 .
- a second end of the refrigerant inlet pipe 22 is connected to a first end of a water circulation pipe (not shown) and a second end of the refrigerant outlet pipe 23 is connected to a second end of the circulation pipe. Water is thus introduced into the refrigerant passages 24 through the corresponding first ends 22 a of the refrigerant inlet pipe 22 . The water is then passed through the refrigerant passages 24 and discharged through the first ends 23 a of the refrigerant outlet pipe 23 to return to the circulation pipe.
- each refrigerant passage 24 which faces the corresponding first end 22 a of the refrigerant inlet pipe 22 , is the inlet into the refrigerant passage 24 .
- the inlet portion of the refrigerant passage 24 is an upstream portion 24 a of the refrigerant passage 24 in the water flow direction (represented by arrow X 2 in FIG. 2 ).
- the front opening of each refrigerant passage 24 which faces the corresponding first end 23 a of the refrigerant outlet pipe 23 , is the outlet from the refrigerant passage 24 .
- the outlet portion of the refrigerant passage 24 is a downstream portion 24 b of the refrigerant passage 24 in the water flow direction.
- each refrigerant passage 24 refers to a zone close to the inlet with respect to a middle portion in the flow direction in the refrigerant passage 24 .
- the “downstream portion 24 b of each refrigerant passage 24 ” refers to a zone close to the outlet with respect to the middle portion in the flow direction in the refrigerant passage 24 .
- each cooling target fluid passage 21 and the adjacent refrigerant passage 24 are arranged side by side in the manner described below.
- the inlet of the refrigerant passage 24 is arranged at the positions corresponding to the position of the outlet of the cooling target fluid passage 21 in the direction in which the passage defining bodies 18 are laminated.
- the position of the outlet of the refrigerant passage 24 corresponds to the position of the inlet of the cooling target fluid passage 21 in the lamination direction of the passage defining bodies 18 .
- EGR gas and water form opposite flows, or, in other words, the flow direction of the EGR gas and the flow direction of the water are opposite to each other.
- Each of the partition walls 19 which form the corresponding passage defining body 18 , separates the corresponding cooling target fluid passage 21 from the adjacent refrigerant passage 24 .
- FIG. 4 is a graph representing the relationship between the positions in the flow direction in the cooling target fluid passage 21 and the flow direction in the refrigerant passage 24 (the axis of abscissas) and the heat flux (the axis of ordinates).
- the line formed by a long dash alternating with two short dashes represents the local heat flux in a portion of each partition wall 19 thermally connected to a corresponding conventional fin in a case in which conventional fin having equal thicknesses over the entire zone (from the upstream portion to the downstream portion in the flow direction) of the cooling target fluid passage 21 .
- the broken line represents the critical heat flux of the water.
- the temperature of the EGR gas in the upstream portion 21 a of each cooling target fluid passage 21 is high.
- the EGR gas is then cooled through heat exchange with the water as the EGR gas proceeds toward the downstream portion 21 b, and the temperature of the EGR gas decreases. Accordingly, as represented by the line formed by a long dash alternating with two short dashes in FIG. 4 , the local heat flux in the portion of each partition wall 19 thermally connected to the corresponding conventional fin becomes greater toward the upstream portion 21 a of the cooling target fluid passage 21 and smaller toward the downstream portion 21 b of the cooling target fluid passage 21 .
- each refrigerant passage 24 the temperature of the water in the upstream portion 24 a of each refrigerant passage 24 is low because only a short time has passed since the water entered the refrigerant passage 24 .
- some of the water is boiled through heat exchange with the EGR gas and transformed into a form mixed with bubbles.
- the water thus moves in the refrigerant passage 24 toward the outlet of the refrigerant passage 24 in the form mixed with bubbles.
- the bubbles may join one another and grow or increase in number.
- the critical heat flux of the water becomes smaller from the upstream portion 24 a toward the downstream portion 24 b in each refrigerant passage 24 . Accordingly, the local heat flux in the portion of each partition wall 19 thermally connected to the corresponding conventional fin is likely to become greater than or equal to the critical heat flux of the water in the upstream portion 21 a of the corresponding cooling target fluid passage 21 , which is a zone in the cooling target fluid passage 21 corresponding to the downstream portion 24 b of the corresponding refrigerant passage 24 .
- each second fin 30 is arranged in the upstream portion 21 a of the associated cooling target fluid passage 21 , which is a zone corresponding to the downstream portion 24 b of the refrigerant passage 24 .
- Each second fin 30 extends in a corrugated shape in the direction perpendicular to the flow direction of the EGR gas.
- the second fin 30 has flat surfaces 30 a each contacting a wall surface 19 a of the partition wall 19 .
- the height of the second fin 30 is equal to the interval between the two associated partition walls 19 .
- the second fin 30 has corner portions 30 b, each of which is formed on one of the opposite sides of the corresponding one of the flat surfaces 30 a and has a round shape.
- Brazing filler R 1 is poured into the gap between each of the corner portions 30 b and the corresponding one of the partition walls 19 and melted so that the second fin 30 is brazed to the partition wall 19 .
- the second fin 30 and the partition wall 19 are thus thermally connected together and heat is transmissible between the second fin 30 and the partition wall 19 .
- Each first fin 31 is arranged in the downstream portion 21 b of the associated cooling target fluid passage 21 , which is a zone corresponding to the upstream portion 24 a of the refrigerant passage 24 .
- Each first fin 31 extends in a corrugated shape in the direction perpendicular to the flow direction of EGR gas.
- the first fin 31 has flat surfaces 31 a each contacting the corresponding wall surface 19 a of the partition wall 19 .
- the height of the first fin 31 is equal to the interval between the two associated partition walls 19 .
- the first fin 31 has corner portions 31 b, each of which is formed on one of the opposite sides of the corresponding one of the flat surfaces 31 a and has a round shape.
- Brazing filler R 1 is poured into the gap between each corner portion 31 b and the corresponding partition wall 19 and melted so that the first fin 31 is brazed to the partition wall 19 .
- the first fin 31 and the partition wall 19 are thus thermally connected together and heat is transmissible between the first fin 31 and the partition wall 19 .
- each second fin 30 is greater than the thickness L 2 of each first fin 31 .
- the second fin 30 thus has a greater cross-sectional area than the first fin 31 .
- the second fin 30 and the first fin 31 have substantially equal surface areas. The proportion of the surface area with respect to the cross-sectional area perpendicular to the heat transmitting direction in the second fin 30 is smaller than the corresponding proportion in the first fin 31 .
- EGR gas which is some of the exhaust gas discharged from the internal combustion engine, flows to the inlet of the EGR passage and is directed to the cooling target fluid passage 21 via the cooling target fluid inlet portion 14 and the corresponding elongated holes 13 e.
- the EGR gas then flows from the inlet to the outlet in each of the cooling target fluid passages 21 .
- a non-illustrated pump arranged in the circulation pipe is actuated to forcibly circulate water in the circulation pipe.
- the water is thus introduced into the refrigerant passages 24 through the refrigerant inlet pipe 22 .
- the water then flows from the inlet to the outlet in each of the refrigerant passages 24 .
- each second fin 30 is arranged in the upstream portion 21 a of the associated cooling target fluid passage 21 , which is a zone in the cooling target fluid passage 21 corresponding to the downstream portion 24 b of the refrigerant passage 24 , where the local heat flux in the portion of each of the partition walls 19 thermally connected to the corresponding one of the conventional fins is likely to become greater than or equal to the critical heat reflux of the water.
- the cross-sectional area of the second fin 30 is greater than the cross-sectional area of each first fin 31 , which is located in a zone other than the above-described zones.
- each second fin 30 is arranged in a zone in the cooling target fluid passage 21 corresponding to the downstream portion 24 b. As a result, even though the critical heat flux of the water is small, the local heat flux in the portion of each partition wall 19 thermally connected to the corresponding second fin 30 is smaller than the critical heat flux of the water.
- the solid line represents the local heat flux in the portion of each partition wall 19 thermally connected to the corresponding second fin 30 and the corresponding first fin 31 .
- each second fin 30 by increasing the cross-sectional area of each second fin 30 , the local heat flux in the portion of the corresponding partition wall 19 thermally connected to the second fin 30 is reduced. Specifically, the local heat flux in the portion of each partition wall 19 thermally connected to the corresponding second fin 30 is smaller than the critical heat flux of the water, thus preventing local burnout.
- the thickness L 1 of each second fin 30 must be set to such a value that the local heat flux at the position where the second fin 30 and the corresponding partition wall 19 are thermally connected together is smaller than the critical heat flux of the water.
- the water boils and evaporates at the wall surfaces 19 a of the partition walls 19 , thus generating boiling vaporization latent heat.
- the latent heat is then used to cool the EGR gas flowing in the cooling target fluid passage 21 .
- the water is directed from the outlet of each refrigerant passage 24 into the circulation pipe through the refrigerant outlet pipe 23 .
- the water is then condensed by a non-illustrated refrigerant condensing portion arranged in the circulation pipe and returned to the heat exchanger 11 .
- the cooled EGR gas is directed from the outlet of each cooling target fluid passage 21 into the outlet of the EGR passage through the outlet pipe 17 .
- the EGR gas is then returned from the outlet of the EGR passage to the intake system of the internal combustion engine.
- the first embodiment has the advantages described below.
- each cooling target fluid passage 21 which is a zone in the cooling target fluid passage 21 corresponding to the downstream portion 24 b of the refrigerant passage 24 .
- the local heat flux in the portion of each partition wall 19 thermally connected to the corresponding second fin 30 is likely to increase and the critical heat flux of the water is likely to decrease.
- Each second fin 30 is thus arranged in the aforementioned zone.
- Each first fin 31 is arranged in another zone.
- the thickness L 1 of each second fin 30 is greater than the thickness L 2 of each first fin 31 .
- This increases the heat transmission area of the portion of each partition wall 19 thermally connected to the corresponding second fin 30 , thus decreasing the local heat flux in this portion of the partition wall 19 .
- the local heat flux in the portion of the partition wall 19 thermally connected to the second fin 30 is prevented from becoming greater or equal to the critical heat flux of the water. Local burnout is thus prevented from occurring.
- each second fin 30 which has a thickness greater than the thickness of a conventional fin in the upstream portion 21 a of the cooling target fluid passage 21 , the heat transmission area is increased and film boiling is prevented.
- FIGS. 5 and 6 A heat exchanger for an EGR (exhaust gas recirculation) gas cooling device (an EGR cooler) in an EGR apparatus for vehicles according to a second embodiment of the present invention will now be described with reference to FIGS. 5 and 6 .
- EGR exhaust gas recirculation
- FIGS. 5 and 6 The same or like reference numerals are given to components of the second embodiment that are the same as or like corresponding components of the first embodiment. Repeated description of the components is omitted or simplified herein.
- FIG. 5 shows only a portion of the heat exchanging portion 12 for illustrative purposes.
- each cooling target fluid passage 21 is arranged at a position corresponding to the inlet of the refrigerant passage 24 in the lamination direction of the passage defining bodies 18 .
- the position of the outlet of the cooling target fluid passage 21 corresponds to the position of the outlet of the refrigerant passage 24 in the lamination direction of the passage defining body 18 .
- EGR gas and water form parallel flows, or, in other words, the flow direction of the EGR gas (represented by arrow X 1 in FIG. 5 ) is parallel to the flow direction of the water (represented by arrow X 2 in the drawing).
- Each second fin 30 is arranged in the downstream portion 21 b of the associated cooling target fluid passage 21 , which is a zone in the cooling target fluid passage 21 corresponding to the downstream portion 24 b of the refrigerant passage 24 .
- Each first fin 31 is arranged in the upstream portion 21 a of the associated cooling target fluid passage 21 , which is a zone in the cooling target fluid passage 21 corresponding to the upstream portion 24 a of the refrigerant passage 24 .
- the local heat flux in the portion of each partition wall 19 thermally connected to the corresponding conventional fin is likely to become greater than or equal to the critical heat flux of the water in the downstream portion 21 b of the corresponding cooling target fluid passage 21 , which is a zone in the cooling target fluid passage 21 corresponding to the downstream portion 24 b of the corresponding refrigerant passage 24 .
- each second fin 30 is arranged in the downstream portion 21 b of the associated cooling target fluid passage 21 , which is a zone corresponding to the downstream portion 24 b of the refrigerant passage 24 .
- Each first fin 31 is arranged in a zone other than the aforementioned zone.
- the second embodiment has the same advantage as the advantage (1) of the first embodiment.
- FIG. 7 shows only a portion of the heat exchanging portion 12 for illustrative purposes.
- the inlet of the refrigerant passage 24 is arranged on one side in the direction perpendicular to the flow direction of EGR gas (represented by arrow X 1 in FIG. 7 ).
- the outlets of the refrigerant passages 24 are located at the other side in the direction perpendicular to the EGR gas flow direction.
- EGR gas and water form perpendicular flows, or, in other words, the flow direction of the EGR gas and the flow direction of the water (represented by arrow X 2 in FIG. 7 ) extend perpendicular to each other.
- the cooling target fluid passage 21 and the refrigerant passage 24 are thus arranged side by side such that the EGR flow direction and the water flow direction cross each other, or, more specifically, extend perpendicular to each other.
- Each second fin 30 is arranged in the upstream portion 21 a of the associated cooling target fluid passage 21 , which is a zone in the cooling target fluid passage 21 corresponding to the downstream portion 24 b of the refrigerant passage 24 . As viewed from above, each of the second fins 30 is shaped like a right triangle. Each first fin 31 is arranged in a zone other than the zone corresponding to the second fin 30 .
- the graph in FIG. 8 represents the relationship between positions in the flow direction in each cooling target fluid passage 21 and heat flux, as observed along the cross section taken along line A-A in FIG. 7 .
- each second fin 30 is arranged in the upstream portion 21 a of the associated cooling target fluid passage 21 , which is a zone in the cooling target fluid passage 21 corresponding to the downstream portion 24 b of the refrigerant passage 24 .
- Each first fin 31 is arranged in a zone other than the aforementioned zone.
- the third embodiment has the same advantages as the advantages (1) and (2) of the first embodiment.
- each second fin 30 is arranged in the downstream portion 21 b of the associated cooling target fluid passage 21 , which is a zone in the cooling target fluid passage 21 corresponding to the downstream portion 24 b of the refrigerant passage 24 .
- Each first fin 31 is arranged in a zone other than the aforementioned zone.
- the present invention is not restricted to this configuration.
- each second fin 30 may be located in the upstream portion 21 a of the associated cooling target fluid passage 21 , which is a zone in the cooling target fluid passage 21 corresponding to the upstream portion 24 a of the refrigerant passage 24 .
- Each first fin 31 is arranged in a zone other than the aforementioned zone.
- the local heat flux in the portion of each partition walls 19 thermally connected to the corresponding one of the conventional fins is likely to become greater than or equal to the critical heat flux of the water in the upstream portion 21 a of the corresponding cooling target fluid passage 21 , which is a zone in the cooling target fluid passage 21 corresponding to the upstream portion 24 a of the corresponding refrigerant passage 24 .
- the second fin 30 is arranged in the upstream portion 21 a of the cooling target fluid passage 21 , which is a zone in the cooling target fluid passage 21 corresponding to the upstream portion 24 a of the refrigerant passage 24 .
- Each first fin 31 is located in a zone other than the aforementioned zone.
- each second fin 30 may be arranged in a middle portion of the associated cooling target fluid passage 21 and each first fin 31 may be arranged in a zone in the cooling target fluid passage 21 other than the zone corresponding to the middle portion.
- the local heat flux in the portion of each partition wall 19 thermally connected to the corresponding the conventional fin is likely to become greater than or equal to the critical heat flux of the water in the middle portion of the cooling target fluid passage 21 .
- the second fin 30 is located in the middle portion of the cooling target fluid passage 21 and the first fin 31 is arranged in a zone other than the zone corresponding to the middle portion.
- the local heat flux in the portion of each partition wall 19 thermally connected to the corresponding second fin 30 is smaller than the critical heat flux of the water.
- each second fin 30 is greater than the thickness L 2 of each first fin 31 .
- the present invention is not restricted to this configuration.
- the second fin 30 and the first fin 31 may have the same thickness.
- brazing filler R 1 is supplied into the gap between each corner portion 30 b of the second fin 30 and the corresponding partition wall 19 by an amount greater than the amount of the brazing filler R 1 used in the gap between each corner portion 31 b of the first fin 31 and the corresponding partition wall 19 . In this manner, the contact area by which the base portion of each second fin 30 is held in contact with the brazing filler R 1 is increased.
- each second fin 30 may be smaller than the height of each first fin 31 . This decreases the surface area of the second fin 30 compared to the surface area of the first fin 31 . As a result, compared to a case in which the second fins 30 and the first fins 31 have equal heights, the exposure area by which each second fin 30 is exposed to EGR gas decreases, thus reducing the local heat flux in the portion of the corresponding partition wall 19 thermally connected to the second fin 30 .
- each second fin 30 is not restricted to the right triangle as viewed from above.
- the shape of the second fin 30 is not particularly restricted and may be any suitable shape such as a rectangular shape as viewed from above, as long as the second fin 30 is arranged in correspondence with minimum portion of the upstream portion 21 a of the cooling target fluid passage 21 , which are minimum portions of the zones corresponding to the downstream portions 24 b of the refrigerant passages 24 .
- EGR gas and water form the perpendicular flows, or, in other words, the flow direction of the EGR gas and the flow direction of the water extend perpendicular to each other.
- the flow directions of the EGR gas and the water may simply cross each other, without extending perpendicular to each other.
- each second fin 30 and the first fins 31 each have a corrugated shape.
- each second fin 30 and each first fin 31 may be shaped in any other suitable shape.
- the first ends 22 a of the refrigerant inlet pipe 22 are passed through the right surface of the housing 11 a and the first ends 23 a of the refrigerant outlet pipe 23 extend through the left surface of the housing 11 a.
- the configuration for directing the water into and out from the heat exchanging portion is not restricted to this.
- the refrigerant inlet pipe 22 may be connected to the top surface of the housing 11 a to introduce water into the heat exchanging portion.
- the refrigerant outlet pipe 23 is connected to the bottom surface of the housing 11 a to direct the water out from the heat exchanging portion.
- the heat exchanger 11 is embodied as the heat exchanger 11 used in an EGR gas vapor cooling device (an EGR cooler).
- the heat exchanger 11 may be embodied as a heat exchanger employed in a cooler for a device mounted in a vehicle, a refrigerator, or a freezer.
- the cooling target fluid is EGR gas.
- the cooling target fluid is not restricted to this and may be gas other than the EGR gas or high-temperature liquid.
- the present invention may be employed in a shell-and-tube type vapor cooling heat exchanger.
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- Exhaust-Gas Circulating Devices (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
- The present invention relates to an vapor cooling heat exchanger.
- Typically, a heat exchanger for an vapor cooling apparatus includes a cooling target fluid passage, in which cooling target fluid flows, and a refrigerant passage, in which liquid refrigerant for cooling the cooling target fluid flows. Heat exchange is brought about between the cooling target fluid passage and the refrigerant passage through a partition wall. In the heat exchanger, the liquid refrigerant flowing in the refrigerant passage cools the partition wall, which has been heated by the cooling target fluid, and is thus heated. When the temperature of the heat transmitting surface of the partition wall exceeds the saturation temperature of the liquid refrigerant, nucleate boiling, in which generation and departure of bubbles are repeated, is initiated on the wall surface of the partition wall. The cooling target fluid flowing in the cooling target fluid passage is thus cooled by using the boiling vaporization latent heat produced through the nucleate boiling. One such type of heat exchanger for an vapor cooling apparatus is disclosed in, for example,
Patent Document 1. -
Patent Document 1 describes a plate fin type exhaust gas heat exchanger. The exhaust gas heat exchanger is configured by a necessary number of layers each including a fluid passage having a corrugated fin for increasing a heat transmission surface area. The layers are arranged between a pair of tube plates, which are partition walls, having a pair of spacer bars that close opposite sides of the tube plates. In the exhaust gas heat exchanger, high-temperature fluid (cooling target fluid) and low-temperature fluid (liquid refrigerant) enter separate fluid passages through adjacent side surfaces. Heat exchange is thus caused between the high-temperature fluid and the low-temperature fluid through the tube plates and the corrugated fins. Meanwhile, vapor cooling is carried out. -
- Patent Document 1: Japanese Laid-Open Utility Model Publication No. 3-79070
- However, in the exhaust gas heat exchanger described in
Patent Document 1, heat flux in the fluid passage in which the high-temperature fluid flows locally increases in a contact portion of each tube plate that contacts the corresponding corrugated fin. This promotes boiling of the low-temperature fluid at the position corresponding to the contact portion, where the heat flux locally increases, in the fluid passage in which the low-temperature fluid flows. As a result, film boiling may occur and cover each tube plate with a bubble film, thus causing a burnout. This causes dryness in the fluid passage in which the low-temperature fluid flows at the position corresponding to the contact portion and decreases cooling performance of the heat exchanger. - Accordingly, it is an objective of the present invention to prevent local burnout in an vapor cooling heat exchanger having a fin arranged in a cooling target fluid passage.
- In accordance with one aspect of the present invention, an vapor cooling heat exchanger that includes a partition wall and a fin is provided. The partition wall separates a cooling target fluid passage, in which cooling target fluid flows, from a refrigerant passage, in which refrigerant for cooling the cooling target fluid flows. The fin is arranged in the cooling target fluid passage and thermally connected to the partition wall. The fin includes a first fin and a second fin. The second fin decreases a local heat flux of the partition wall by a greater degree than the first fin does. The first fin and the second fin are arranged based on the relationship between the local heat flux of the partition wall and the critical heat flux of the refrigerant.
- In accordance with one aspect, the thickness of the second fin is greater than the thickness of the first fin.
- In accordance with another aspect, the second fin is arranged in an upstream portion of the cooling target fluid passage in the flow direction of the cooling target fluid where the local heat flux of the partition wall increases.
- In accordance with a further aspect, the second fin is arranged in a zone of the cooling target fluid passage that corresponds to a downstream portion of the refrigerant passage in the flow direction of the refrigerant where the critical heat flux decreases.
- Also, in accordance with another aspect, the cooling target fluid passage and the refrigerant passage are arranged side by side such that the flow direction of the cooling target fluid and the flow direction of the refrigerant cross each other. The second fin is arranged in an upstream portion of the cooling target fluid passage in the flow direction of the cooling target fluid that is a zone in the cooling target fluid passage that corresponds to a downstream portion of the refrigerant passage in the flow direction of the refrigerant.
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FIG. 1 is a perspective view schematically showing an vapor cooling heat exchanger according to a first embodiment of the present invention; -
FIG. 2 is an exploded perspective view showing a heat exchanging portion of the heat exchanger illustrated inFIG. 1 ; -
FIG. 3A is a vertical cross-sectional view showing a second fin; -
FIG. 3B is a vertical cross-sectional view showing a first fin; -
FIG. 4 is a graph representing the relationship between positions in the flow directions in a cooling target fluid passage and the flow direction in a refrigerant passage and heat flux in the first embodiment; -
FIG. 5 is an exploded perspective view showing a portion of a heat exchanging portion of a second embodiment; -
FIG. 6 is a graph representing the relationship between positions in the flow direction in a cooling target fluid passage and the flow direction in a refrigerant passage and heat flux in the second embodiment; -
FIG. 7 is an exploded perspective view showing a portion of a heat exchanging portion of a third embodiment; -
FIG. 8 is a graph representing the relationship between positions in the flow direction in a cooling target fluid passage and heat flux in the third embodiment; -
FIG. 9 is an exploded perspective view showing a portion of a heat exchanging portion of another embodiment; -
FIG. 10 is a graph representing the relationship between positions in the flow direction in a cooling target fluid passage and the flow direction in a refrigerant passage and heat flux in the embodiment illustrated inFIG. 9 ; -
FIG. 11 is an exploded perspective view showing a portion of a heat exchanging portion of another embodiment; and -
FIG. 12 is a graph representing the relationship between positions in the flow direction in a cooling target fluid passage and the flow direction in a refrigerant passage and heat flux in the embodiment illustrated inFIG. 11 . - An vapor cooling heat exchanger (hereinafter, referred to simply as a heat exchanger) for an EGR (exhaust gas recirculation) gas vapor cooling device (an EGR cooler) used in an EGR apparatus for vehicles will now be described with reference to
FIGS. 1 to 4 . Theheat exchanger 11 for the EGR apparatus causes heat exchange between EGR gas serving as cooling target fluid and water (liquid refrigerant) serving as refrigerant, thus boiling some of the water to cool the EGR gas. For the description below, a “forward-rearward direction”, an “upward-downward direction”, and a “leftward-rightward direction” are defined as represented by the corresponding arrows inFIG. 1 , unless otherwise specified. - As shown in
FIG. 1 , aheat exchanging portion 12 is received in a substantially rectangular box-like housing 11 a, which configures an outer casing for theheat exchanger 11. In the housing 11 a, a cooling targetfluid inlet portion 14 is arranged forward of theheat exchanging portion 12. A cooling targetfluid outlet portion 15 is arranged rearward of theheat exchanging portion 12. - An
inlet pipe 16 for introducing EGR gas into the cooling targetfluid inlet portion 14 is connected to the front surface of the housing 11 a. Anoutlet pipe 17 for discharging the EGR gas out from the cooling targetfluid outlet portion 15 is connected to the rear surface of the housing 11 a. Theheat exchanger 11 is used with theinlet pipe 16 connected to the inlet of an EGR passage and theoutlet pipe 17 connected to the outlet of the EGR passage. - First ends 22 a of a
refrigerant inlet pipe 22, which introduces water into theheat exchanging portion 12 of the housing 11 a, are drawn into the housing 11 a through the right surface of the housing 11 a, which is one of the opposite surfaces located between the front and rear surfaces. Also, first ends 23 a of arefrigerant outlet pipe 23, which discharge water out from theheat exchanging portion 12, are drawn into the housing 11 a through the left surface of the housing 11 a, which is the other one of the opposite surfaces located between the front and rear surfaces. - With reference to
FIG. 2 , theheat exchanging portion 12 includes a plurality of (in the first embodiment, three)passage defining bodies 18. Each of thepassage defining bodies 18 is configured by afirst fin 31 and asecond fin 30, which are arranged between twoflat partition walls 19. A pair ofspacer bars 20 close opposite sides of thepartition walls 19. As illustrated inFIG. 1 , theheat exchanging portion 12 includes afront wall 13 a joined to the front opening ends of thepassage defining bodies 18 and arear wall 13 b joined to the rear opening ends of thepassage defining bodies 18. Thepassage defining bodies 18 are joined to thefront wall 13 a and therear wall 13 b such that thecorresponding partition walls 19 of the adjacent pairs of thepassage defining bodies 18 are spaced apart at uniform intervals. - The front opening of each
passage defining body 18 is arranged on the side corresponding to the cooling targetfluid inlet portion 14 and the rear opening of thepassage defining body 18 is located on the side corresponding to the cooling targetfluid outlet portion 15. Thefront wall 13 a has elongatedholes 13 e, which are formed at positions corresponding to thepassage defining bodies 18 to allow communication between the interior of the cooling targetfluid inlet portion 14 and the front openings of the correspondingpassage defining bodies 18. Therear wall 13 b has elongated holes (not shown) formed at positions corresponding to thepassage defining bodies 18 to allow communication between the interior of the cooling targetfluid outlet portion 15 and the rear openings of the correspondingpassage defining bodies 18. - After flowing from the
inlet pipe 16 into the cooling targetfluid inlet portion 14, EGR gas enters thepassage defining bodies 18 from the front openings through the correspondingelongated holes 13 e in thefront wall 13 a. The EGR gas flows out from the rear openings into the cooling targetfluid outlet portion 15 through the corresponding elongated holes in therear wall 13 b. The EGR gas is then directed to the outlet of the EGR passage through theoutlet pipe 17. As a result, with reference toFIG. 2 , the interior of eachpassage defining body 18 forms a coolingtarget fluid passage 21, in which EGR gas flows. - The front opening of each one of the
passage defining bodies 18 is the inlet for EGR gas into the corresponding coolingtarget fluid passage 21. The portion corresponding to the inlet of eachpassage defining body 18 is an upstream portion 21 a of each of the corresponding coolingtarget fluid passage 21 in the flow direction of the EGR gas (as represented by arrow X1 inFIG. 2 ). The rear opening of eachpassage defining body 18 is the outlet for the EGR gas from the corresponding coolingtarget fluid passage 21. The portion corresponding to the outlet of eachpassage defining body 18 is adownstream portion 21 b of each of the corresponding coolingtarget fluid passage 21 in the flow direction of the EGR gas. In the first embodiment, the “upstream portion 21 a of each coolingtarget fluid passage 21” refers to a zone close to the inlet with respect to a middle portion in the flow direction in the coolingtarget fluid passage 21. The “downstream portion 21 b of each coolingtarget fluid passage 21” refers to a zone close to the outlet with respect to the middle portion in the flow direction in the coolingtarget fluid passage 21. - In the
heat exchanging portion 12, arefrigerant passage 24 is defined between the opposingpartition walls 19 of each adjacent pair of thepassage defining bodies 18. As shown inFIG. 1 , the front opening of eachrefrigerant passage 24 communicates with the corresponding one of the first ends 23 a of therefrigerant outlet pipe 23 through a hole formed in thefront wall 13 a. The rear opening of therefrigerant passage 24 communicates with the corresponding one of the first ends 22 a of therefrigerant inlet pipe 22 through ahole 13 c formed in therear wall 13 b. The opposite sides of eachrefrigerant passage 24 perpendicular to thefront wall 13 a and therear wall 13 b are closed by the left and right surfaces of the housing 11 a. - The first ends 23 a of the
refrigerant outlet pipe 23 face the front openings of the correspondingrefrigerant passages 24. The first ends 22 a of therefrigerant inlet pipe 22 face the rear openings of the correspondingrefrigerant passages 24. A second end of therefrigerant inlet pipe 22 is connected to a first end of a water circulation pipe (not shown) and a second end of therefrigerant outlet pipe 23 is connected to a second end of the circulation pipe. Water is thus introduced into therefrigerant passages 24 through the corresponding first ends 22 a of therefrigerant inlet pipe 22. The water is then passed through therefrigerant passages 24 and discharged through the first ends 23 a of therefrigerant outlet pipe 23 to return to the circulation pipe. - The rear opening of each
refrigerant passage 24, which faces the correspondingfirst end 22 a of therefrigerant inlet pipe 22, is the inlet into therefrigerant passage 24. The inlet portion of therefrigerant passage 24 is anupstream portion 24 a of therefrigerant passage 24 in the water flow direction (represented by arrow X2 inFIG. 2 ). The front opening of eachrefrigerant passage 24, which faces the correspondingfirst end 23 a of therefrigerant outlet pipe 23, is the outlet from therefrigerant passage 24. The outlet portion of therefrigerant passage 24 is adownstream portion 24 b of therefrigerant passage 24 in the water flow direction. In the first embodiment, the “upstream portion 24 a of eachrefrigerant passage 24” refers to a zone close to the inlet with respect to a middle portion in the flow direction in therefrigerant passage 24. The “downstream portion 24 b of eachrefrigerant passage 24” refers to a zone close to the outlet with respect to the middle portion in the flow direction in therefrigerant passage 24. - In the
heat exchanging portion 12, each coolingtarget fluid passage 21 and the adjacentrefrigerant passage 24 are arranged side by side in the manner described below. Specifically, the inlet of therefrigerant passage 24 is arranged at the positions corresponding to the position of the outlet of the coolingtarget fluid passage 21 in the direction in which thepassage defining bodies 18 are laminated. The position of the outlet of therefrigerant passage 24 corresponds to the position of the inlet of the coolingtarget fluid passage 21 in the lamination direction of thepassage defining bodies 18. As a result, in theheat exchanger 11 of the first embodiment, EGR gas and water form opposite flows, or, in other words, the flow direction of the EGR gas and the flow direction of the water are opposite to each other. Each of thepartition walls 19, which form the correspondingpassage defining body 18, separates the corresponding coolingtarget fluid passage 21 from the adjacentrefrigerant passage 24. -
FIG. 4 is a graph representing the relationship between the positions in the flow direction in the coolingtarget fluid passage 21 and the flow direction in the refrigerant passage 24 (the axis of abscissas) and the heat flux (the axis of ordinates). The line formed by a long dash alternating with two short dashes represents the local heat flux in a portion of eachpartition wall 19 thermally connected to a corresponding conventional fin in a case in which conventional fin having equal thicknesses over the entire zone (from the upstream portion to the downstream portion in the flow direction) of the coolingtarget fluid passage 21. The broken line represents the critical heat flux of the water. - Since only a short time has passed after EGR gas reached the cooling
target fluid passage 21, the temperature of the EGR gas in the upstream portion 21 a of each coolingtarget fluid passage 21 is high. The EGR gas is then cooled through heat exchange with the water as the EGR gas proceeds toward thedownstream portion 21 b, and the temperature of the EGR gas decreases. Accordingly, as represented by the line formed by a long dash alternating with two short dashes inFIG. 4 , the local heat flux in the portion of eachpartition wall 19 thermally connected to the corresponding conventional fin becomes greater toward the upstream portion 21 a of the coolingtarget fluid passage 21 and smaller toward thedownstream portion 21 b of the coolingtarget fluid passage 21. - In contrast, the temperature of the water in the
upstream portion 24 a of eachrefrigerant passage 24 is low because only a short time has passed since the water entered therefrigerant passage 24. As the water proceeds toward thedownstream portion 24 b, some of the water is boiled through heat exchange with the EGR gas and transformed into a form mixed with bubbles. The water thus moves in therefrigerant passage 24 toward the outlet of therefrigerant passage 24 in the form mixed with bubbles. As the bubbles flow toward thedownstream portion 24 b of therefrigerant passage 24, the bubbles may join one another and grow or increase in number. - As a result, as represented by the broken line in
FIG. 4 , the critical heat flux of the water becomes smaller from theupstream portion 24 a toward thedownstream portion 24 b in eachrefrigerant passage 24. Accordingly, the local heat flux in the portion of eachpartition wall 19 thermally connected to the corresponding conventional fin is likely to become greater than or equal to the critical heat flux of the water in the upstream portion 21 a of the corresponding coolingtarget fluid passage 21, which is a zone in the coolingtarget fluid passage 21 corresponding to thedownstream portion 24 b of the correspondingrefrigerant passage 24. - In the first embodiment, each
second fin 30 is arranged in the upstream portion 21 a of the associated coolingtarget fluid passage 21, which is a zone corresponding to thedownstream portion 24 b of therefrigerant passage 24. Eachsecond fin 30 extends in a corrugated shape in the direction perpendicular to the flow direction of the EGR gas. With reference toFIG. 3A , thesecond fin 30 hasflat surfaces 30 a each contacting awall surface 19 a of thepartition wall 19. The height of thesecond fin 30 is equal to the interval between the two associatedpartition walls 19. Thesecond fin 30 hascorner portions 30 b, each of which is formed on one of the opposite sides of the corresponding one of theflat surfaces 30 a and has a round shape. Brazing filler R1 is poured into the gap between each of thecorner portions 30 b and the corresponding one of thepartition walls 19 and melted so that thesecond fin 30 is brazed to thepartition wall 19. Thesecond fin 30 and thepartition wall 19 are thus thermally connected together and heat is transmissible between thesecond fin 30 and thepartition wall 19. - Each
first fin 31 is arranged in thedownstream portion 21 b of the associated coolingtarget fluid passage 21, which is a zone corresponding to theupstream portion 24 a of therefrigerant passage 24. Eachfirst fin 31 extends in a corrugated shape in the direction perpendicular to the flow direction of EGR gas. With reference toFIG. 3B , thefirst fin 31 hasflat surfaces 31 a each contacting thecorresponding wall surface 19 a of thepartition wall 19. The height of thefirst fin 31 is equal to the interval between the two associatedpartition walls 19. Thefirst fin 31 hascorner portions 31 b, each of which is formed on one of the opposite sides of the corresponding one of theflat surfaces 31 a and has a round shape. Brazing filler R1 is poured into the gap between eachcorner portion 31 b and thecorresponding partition wall 19 and melted so that thefirst fin 31 is brazed to thepartition wall 19. Thefirst fin 31 and thepartition wall 19 are thus thermally connected together and heat is transmissible between thefirst fin 31 and thepartition wall 19. - With reference to
FIGS. 3A and 3B , the thickness L1 of eachsecond fin 30 is greater than the thickness L2 of eachfirst fin 31. Thesecond fin 30 thus has a greater cross-sectional area than thefirst fin 31. Thesecond fin 30 and thefirst fin 31 have substantially equal surface areas. The proportion of the surface area with respect to the cross-sectional area perpendicular to the heat transmitting direction in thesecond fin 30 is smaller than the corresponding proportion in thefirst fin 31. - Operation of the
heat exchanger 11, which has the above-described configuration, will hereafter be described with reference to the graph ofFIG. 4 . - When the vehicle operates, EGR gas, which is some of the exhaust gas discharged from the internal combustion engine, flows to the inlet of the EGR passage and is directed to the cooling
target fluid passage 21 via the cooling targetfluid inlet portion 14 and the correspondingelongated holes 13 e. The EGR gas then flows from the inlet to the outlet in each of the coolingtarget fluid passages 21. - Meanwhile, a non-illustrated pump arranged in the circulation pipe is actuated to forcibly circulate water in the circulation pipe. The water is thus introduced into the
refrigerant passages 24 through therefrigerant inlet pipe 22. The water then flows from the inlet to the outlet in each of therefrigerant passages 24. - In the
heat exchanger 11, heat is transmitted from the EGR gas at a high temperature to the water at a low temperature through thepartition walls 19, thesecond fins 30, and thefirst fins 31. Eachsecond fin 30 is arranged in the upstream portion 21 a of the associated coolingtarget fluid passage 21, which is a zone in the coolingtarget fluid passage 21 corresponding to thedownstream portion 24 b of therefrigerant passage 24, where the local heat flux in the portion of each of thepartition walls 19 thermally connected to the corresponding one of the conventional fins is likely to become greater than or equal to the critical heat reflux of the water. The cross-sectional area of thesecond fin 30 is greater than the cross-sectional area of eachfirst fin 31, which is located in a zone other than the above-described zones. As a result, the heat in the portion of eachpartition wall 19 thermally connected to the correspondingsecond fin 30 is dispersed in the corresponding coolingtarget fluid passage 21, compared to the heat in the portion of thepartition wall 19 thermally connected to the correspondingfirst fin 31. This prevents an increase in the local heat flux. - Since there are a great number of bubbles in the
downstream portion 24 b of eachrefrigerant passage 24, the critical heat flux of the water decreases in thedownstream portion 24 b of therefrigerant passage 24. However, eachsecond fin 30 is arranged in a zone in the coolingtarget fluid passage 21 corresponding to thedownstream portion 24 b. As a result, even though the critical heat flux of the water is small, the local heat flux in the portion of eachpartition wall 19 thermally connected to the correspondingsecond fin 30 is smaller than the critical heat flux of the water. - In the graph of
FIG. 4 , the solid line represents the local heat flux in the portion of eachpartition wall 19 thermally connected to the correspondingsecond fin 30 and the correspondingfirst fin 31. - As is clear from
FIG. 4 , by increasing the cross-sectional area of eachsecond fin 30, the local heat flux in the portion of thecorresponding partition wall 19 thermally connected to thesecond fin 30 is reduced. Specifically, the local heat flux in the portion of eachpartition wall 19 thermally connected to the correspondingsecond fin 30 is smaller than the critical heat flux of the water, thus preventing local burnout. The thickness L1 of eachsecond fin 30 must be set to such a value that the local heat flux at the position where thesecond fin 30 and thecorresponding partition wall 19 are thermally connected together is smaller than the critical heat flux of the water. - As heat exchange occurs between the water and the EGR gas through the
partition walls 19, the water boils and evaporates at the wall surfaces 19 a of thepartition walls 19, thus generating boiling vaporization latent heat. The latent heat is then used to cool the EGR gas flowing in the coolingtarget fluid passage 21. After having cooled the EGR gas, the water is directed from the outlet of eachrefrigerant passage 24 into the circulation pipe through therefrigerant outlet pipe 23. The water is then condensed by a non-illustrated refrigerant condensing portion arranged in the circulation pipe and returned to theheat exchanger 11. Meanwhile, the cooled EGR gas is directed from the outlet of each coolingtarget fluid passage 21 into the outlet of the EGR passage through theoutlet pipe 17. The EGR gas is then returned from the outlet of the EGR passage to the intake system of the internal combustion engine. - The first embodiment has the advantages described below.
- (1) In the upstream portion 21 a of each cooling
target fluid passage 21, which is a zone in the coolingtarget fluid passage 21 corresponding to thedownstream portion 24 b of therefrigerant passage 24, the local heat flux in the portion of eachpartition wall 19 thermally connected to the correspondingsecond fin 30 is likely to increase and the critical heat flux of the water is likely to decrease. Eachsecond fin 30 is thus arranged in the aforementioned zone. Eachfirst fin 31 is arranged in another zone. The thickness L1 of eachsecond fin 30 is greater than the thickness L2 of eachfirst fin 31. This increases the heat transmission area of the portion of eachpartition wall 19 thermally connected to the correspondingsecond fin 30, thus decreasing the local heat flux in this portion of thepartition wall 19. As a result, the local heat flux in the portion of thepartition wall 19 thermally connected to thesecond fin 30 is prevented from becoming greater or equal to the critical heat flux of the water. Local burnout is thus prevented from occurring. - (2) Heat exchange performance is high in the upstream portion 21 a of each cooling
target fluid passage 21. Accordingly, by arranging eachsecond fin 30, which has a thickness greater than the thickness of a conventional fin in the upstream portion 21 a of the coolingtarget fluid passage 21, the heat transmission area is increased and film boiling is prevented. - A heat exchanger for an EGR (exhaust gas recirculation) gas cooling device (an EGR cooler) in an EGR apparatus for vehicles according to a second embodiment of the present invention will now be described with reference to
FIGS. 5 and 6 . The same or like reference numerals are given to components of the second embodiment that are the same as or like corresponding components of the first embodiment. Repeated description of the components is omitted or simplified herein.FIG. 5 shows only a portion of theheat exchanging portion 12 for illustrative purposes. - As illustrated in
FIG. 5 , in theheat exchanging portion 12, the inlets of each coolingtarget fluid passage 21 is arranged at a position corresponding to the inlet of therefrigerant passage 24 in the lamination direction of thepassage defining bodies 18. The position of the outlet of the coolingtarget fluid passage 21 corresponds to the position of the outlet of therefrigerant passage 24 in the lamination direction of thepassage defining body 18. As a result, in theheat exchanger 11 of the second embodiment, EGR gas and water form parallel flows, or, in other words, the flow direction of the EGR gas (represented by arrow X1 inFIG. 5 ) is parallel to the flow direction of the water (represented by arrow X2 in the drawing). - Each
second fin 30 is arranged in thedownstream portion 21 b of the associated coolingtarget fluid passage 21, which is a zone in the coolingtarget fluid passage 21 corresponding to thedownstream portion 24 b of therefrigerant passage 24. Eachfirst fin 31 is arranged in the upstream portion 21 a of the associated coolingtarget fluid passage 21, which is a zone in the coolingtarget fluid passage 21 corresponding to theupstream portion 24 a of therefrigerant passage 24. - As represented by the line formed by a long dash alternating with two short dashes in the graph of
FIG. 6 , in a case in which conventional fin is arranged in the entire zone of the coolingtarget fluid passage 21, the local heat flux in the portion of eachpartition wall 19 thermally connected to the corresponding conventional fin is likely to become greater than or equal to the critical heat flux of the water in thedownstream portion 21 b of the corresponding coolingtarget fluid passage 21, which is a zone in the coolingtarget fluid passage 21 corresponding to thedownstream portion 24 b of the correspondingrefrigerant passage 24. However, in the second embodiment, eachsecond fin 30 is arranged in thedownstream portion 21 b of the associated coolingtarget fluid passage 21, which is a zone corresponding to thedownstream portion 24 b of therefrigerant passage 24. Eachfirst fin 31 is arranged in a zone other than the aforementioned zone. As a result, as represented by the solid line in the graph ofFIG. 6 , the local heat flux in the portion of eachpartition wall 19 thermally connected to the correspondingsecond fin 30 is smaller than the critical heat flux of the water. - Accordingly, the second embodiment has the same advantage as the advantage (1) of the first embodiment.
- A heat exchanger for an EGR (exhaust gas recirculation) gas cooling device (an EGR cooler) in an EGR apparatus for vehicles according to a third embodiment of the present invention will now be described with reference to
FIGS. 7 and 8 .FIG. 7 shows only a portion of theheat exchanging portion 12 for illustrative purposes. - As shown in
FIG. 7 , the inlet of therefrigerant passage 24 is arranged on one side in the direction perpendicular to the flow direction of EGR gas (represented by arrow X1 inFIG. 7 ). The outlets of therefrigerant passages 24 are located at the other side in the direction perpendicular to the EGR gas flow direction. Accordingly, in theheat exchanger 11 of the third embodiment, EGR gas and water form perpendicular flows, or, in other words, the flow direction of the EGR gas and the flow direction of the water (represented by arrow X2 inFIG. 7 ) extend perpendicular to each other. The coolingtarget fluid passage 21 and therefrigerant passage 24 are thus arranged side by side such that the EGR flow direction and the water flow direction cross each other, or, more specifically, extend perpendicular to each other. - Each
second fin 30 is arranged in the upstream portion 21 a of the associated coolingtarget fluid passage 21, which is a zone in the coolingtarget fluid passage 21 corresponding to thedownstream portion 24 b of therefrigerant passage 24. As viewed from above, each of thesecond fins 30 is shaped like a right triangle. Eachfirst fin 31 is arranged in a zone other than the zone corresponding to thesecond fin 30. - The graph in
FIG. 8 represents the relationship between positions in the flow direction in each coolingtarget fluid passage 21 and heat flux, as observed along the cross section taken along line A-A inFIG. 7 . - As represented by the line formed by a long dash alternating with two short dashes in the graph of
FIG. 8 , in a case in which a conventional fin is arranged in the entire zone of the coolingtarget fluid passage 21, the local heat flux in the portion of eachpartition wall 19 thermally connected to the corresponding conventional fin is likely to become greater or equal to the critical heat flux of the water in the upstream portion 21 a of the corresponding coolingtarget fluid passage 21, which is a zone corresponding to thedownstream portion 24 b of the correspondingrefrigerant passage 24. However, in the third embodiment, eachsecond fin 30 is arranged in the upstream portion 21 a of the associated coolingtarget fluid passage 21, which is a zone in the coolingtarget fluid passage 21 corresponding to thedownstream portion 24 b of therefrigerant passage 24. Eachfirst fin 31 is arranged in a zone other than the aforementioned zone. As a result, as represented by the solid line in the graph ofFIG. 8 , the local heat flux in the portion of eachpartition wall 19 thermally connected to the correspondingsecond fin 30 is smaller than the critical heat flux of the water. - Accordingly, the third embodiment has the same advantages as the advantages (1) and (2) of the first embodiment.
- The illustrated embodiments may be modified to the forms described below.
- In the second embodiment, each
second fin 30 is arranged in thedownstream portion 21 b of the associated coolingtarget fluid passage 21, which is a zone in the coolingtarget fluid passage 21 corresponding to thedownstream portion 24 b of therefrigerant passage 24. Eachfirst fin 31 is arranged in a zone other than the aforementioned zone. However, the present invention is not restricted to this configuration. For example, as illustrated inFIG. 9 , eachsecond fin 30 may be located in the upstream portion 21 a of the associated coolingtarget fluid passage 21, which is a zone in the coolingtarget fluid passage 21 corresponding to theupstream portion 24 a of therefrigerant passage 24. Eachfirst fin 31 is arranged in a zone other than the aforementioned zone. As represented by the line formed by a long dash alternating with two short dashes in the graph ofFIG. 10 , in a case in which a conventional fin is arranged in the entire zone of the coolingtarget fluid passage 21, the local heat flux in the portion of eachpartition walls 19 thermally connected to the corresponding one of the conventional fins is likely to become greater than or equal to the critical heat flux of the water in the upstream portion 21 a of the corresponding coolingtarget fluid passage 21, which is a zone in the coolingtarget fluid passage 21 corresponding to theupstream portion 24 a of the correspondingrefrigerant passage 24. However, in this modified embodiment, thesecond fin 30 is arranged in the upstream portion 21 a of the coolingtarget fluid passage 21, which is a zone in the coolingtarget fluid passage 21 corresponding to theupstream portion 24 a of therefrigerant passage 24. Eachfirst fin 31 is located in a zone other than the aforementioned zone. As a result, as represented by the solid line in the graph ofFIG. 10 , the local heat flux in the portion of eachpartition wall 19 thermally connected to the correspondingsecond fin 30 is smaller than the critical heat flux of the water. - In the second embodiment, for example, as illustrated in
FIG. 11 , eachsecond fin 30 may be arranged in a middle portion of the associated coolingtarget fluid passage 21 and eachfirst fin 31 may be arranged in a zone in the coolingtarget fluid passage 21 other than the zone corresponding to the middle portion. As represented by the line formed by a long dash alternating with two short dashes in the graph ofFIG. 12 , in a case in which a conventional fin is arranged in the entire zone of each coolingtarget fluid passage 21, the local heat flux in the portion of eachpartition wall 19 thermally connected to the corresponding the conventional fin is likely to become greater than or equal to the critical heat flux of the water in the middle portion of the coolingtarget fluid passage 21. However, in this modified embodiment, thesecond fin 30 is located in the middle portion of the coolingtarget fluid passage 21 and thefirst fin 31 is arranged in a zone other than the zone corresponding to the middle portion. As a result, as represented by the solid line in the graph ofFIG. 12 , the local heat flux in the portion of eachpartition wall 19 thermally connected to the correspondingsecond fin 30 is smaller than the critical heat flux of the water. - In the illustrated embodiments, the thickness L1 of each
second fin 30 is greater than the thickness L2 of eachfirst fin 31. However, the present invention is not restricted to this configuration. For example, thesecond fin 30 and thefirst fin 31 may have the same thickness. In this case, brazing filler R1 is supplied into the gap between eachcorner portion 30 b of thesecond fin 30 and thecorresponding partition wall 19 by an amount greater than the amount of the brazing filler R1 used in the gap between eachcorner portion 31 b of thefirst fin 31 and thecorresponding partition wall 19. In this manner, the contact area by which the base portion of eachsecond fin 30 is held in contact with the brazing filler R1 is increased. - In the illustrated embodiments, the height of each
second fin 30 may be smaller than the height of eachfirst fin 31. This decreases the surface area of thesecond fin 30 compared to the surface area of thefirst fin 31. As a result, compared to a case in which thesecond fins 30 and thefirst fins 31 have equal heights, the exposure area by which eachsecond fin 30 is exposed to EGR gas decreases, thus reducing the local heat flux in the portion of thecorresponding partition wall 19 thermally connected to thesecond fin 30. - In the third embodiment, the shape of each
second fin 30 is not restricted to the right triangle as viewed from above. The shape of thesecond fin 30 is not particularly restricted and may be any suitable shape such as a rectangular shape as viewed from above, as long as thesecond fin 30 is arranged in correspondence with minimum portion of the upstream portion 21 a of the coolingtarget fluid passage 21, which are minimum portions of the zones corresponding to thedownstream portions 24 b of therefrigerant passages 24. - In the
heat exchanger 11 of the third embodiment, EGR gas and water form the perpendicular flows, or, in other words, the flow direction of the EGR gas and the flow direction of the water extend perpendicular to each other. However, the flow directions of the EGR gas and the water may simply cross each other, without extending perpendicular to each other. - In the illustrated embodiments, the
second fins 30 and thefirst fins 31 each have a corrugated shape. However, eachsecond fin 30 and eachfirst fin 31 may be shaped in any other suitable shape. - In the first embodiment, to introduce water into the
heat exchanging portion 12 and direct the water out from theheat exchanging portion 12, the first ends 22 a of therefrigerant inlet pipe 22 are passed through the right surface of the housing 11 a and the first ends 23 a of therefrigerant outlet pipe 23 extend through the left surface of the housing 11 a. However, the configuration for directing the water into and out from the heat exchanging portion is not restricted to this. For example, as described in “Japanese Laid-Open Patent Publication No. 7-159074”, therefrigerant inlet pipe 22 may be connected to the top surface of the housing 11 a to introduce water into the heat exchanging portion. In this case, therefrigerant outlet pipe 23 is connected to the bottom surface of the housing 11 a to direct the water out from the heat exchanging portion. - In each of the illustrated embodiments, the
heat exchanger 11 is embodied as theheat exchanger 11 used in an EGR gas vapor cooling device (an EGR cooler). However, theheat exchanger 11 may be embodied as a heat exchanger employed in a cooler for a device mounted in a vehicle, a refrigerator, or a freezer. - In each of the illustrated embodiments, the cooling target fluid is EGR gas. However, the cooling target fluid is not restricted to this and may be gas other than the EGR gas or high-temperature liquid.
- The present invention may be employed in a shell-and-tube type vapor cooling heat exchanger.
Claims (6)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009258118A JP5531570B2 (en) | 2009-11-11 | 2009-11-11 | Boiling-cooled heat exchanger |
JP2009-258118 | 2009-11-11 | ||
PCT/JP2010/069677 WO2011058924A1 (en) | 2009-11-11 | 2010-11-05 | Vapor cooling heat exchanger |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120211215A1 true US20120211215A1 (en) | 2012-08-23 |
Family
ID=43991583
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/504,562 Abandoned US20120211215A1 (en) | 2009-11-11 | 2010-11-05 | Vapor cooling heat exchanger |
Country Status (6)
Country | Link |
---|---|
US (1) | US20120211215A1 (en) |
EP (1) | EP2500680A4 (en) |
JP (1) | JP5531570B2 (en) |
KR (1) | KR20120080625A (en) |
CN (1) | CN102597681B (en) |
WO (1) | WO2011058924A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140151001A1 (en) * | 2012-12-05 | 2014-06-05 | Hamilton Sundstrand Corporation | Heat exchanger with variable thickness coating |
WO2016003754A1 (en) * | 2014-06-30 | 2016-01-07 | Modine Manufacturing Company | Heat exchanger and method of making the same |
EP2977703A1 (en) * | 2014-07-25 | 2016-01-27 | Hamilton Sundstrand Corporation | Heat exchanger with slotted guard fin |
US10782074B2 (en) | 2017-10-20 | 2020-09-22 | Api Heat Transfer, Inc. | Heat exchanger with a cooling medium bar |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160195342A1 (en) * | 2015-01-07 | 2016-07-07 | Hamilton Sundstrand Corporation | Heat exchanger with fin wave control |
CN105386893A (en) * | 2015-12-10 | 2016-03-09 | 广西玉柴机器股份有限公司 | Cooling waste heat recycling system of diesel engine |
JP6118008B1 (en) * | 2016-10-07 | 2017-04-19 | 住友精密工業株式会社 | Heat exchanger |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140151001A1 (en) * | 2012-12-05 | 2014-06-05 | Hamilton Sundstrand Corporation | Heat exchanger with variable thickness coating |
US10371467B2 (en) * | 2012-12-05 | 2019-08-06 | Hamilton Sundstrand Corporation | Heat exchanger with variable thickness coating |
WO2016003754A1 (en) * | 2014-06-30 | 2016-01-07 | Modine Manufacturing Company | Heat exchanger and method of making the same |
US20170097194A1 (en) * | 2014-06-30 | 2017-04-06 | Modine Manufacturing Company | Heat Exchanger and Method of Making the Same |
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EP2977703A1 (en) * | 2014-07-25 | 2016-01-27 | Hamilton Sundstrand Corporation | Heat exchanger with slotted guard fin |
US10782074B2 (en) | 2017-10-20 | 2020-09-22 | Api Heat Transfer, Inc. | Heat exchanger with a cooling medium bar |
Also Published As
Publication number | Publication date |
---|---|
CN102597681B (en) | 2014-07-30 |
WO2011058924A1 (en) | 2011-05-19 |
CN102597681A (en) | 2012-07-18 |
EP2500680A4 (en) | 2014-08-06 |
KR20120080625A (en) | 2012-07-17 |
EP2500680A1 (en) | 2012-09-19 |
JP2011102681A (en) | 2011-05-26 |
JP5531570B2 (en) | 2014-06-25 |
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