WO2006024340A1 - A plate heat exchanger - Google Patents

A plate heat exchanger Download PDF

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Publication number
WO2006024340A1
WO2006024340A1 PCT/EP2005/007329 EP2005007329W WO2006024340A1 WO 2006024340 A1 WO2006024340 A1 WO 2006024340A1 EP 2005007329 W EP2005007329 W EP 2005007329W WO 2006024340 A1 WO2006024340 A1 WO 2006024340A1
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WO
WIPO (PCT)
Prior art keywords
plates
heat exchanger
plate
plate heat
tops
Prior art date
Application number
PCT/EP2005/007329
Other languages
French (fr)
Inventor
Peter Nilsson
Original Assignee
Swep International Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
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Application filed by Swep International Ab filed Critical Swep International Ab
Priority to JP2007528635A priority Critical patent/JP2008511811A/en
Priority to US11/632,582 priority patent/US20080029257A1/en
Priority to AU2005279446A priority patent/AU2005279446C1/en
Publication of WO2006024340A1 publication Critical patent/WO2006024340A1/en

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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
    • 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
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
    • 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
    • F28D9/0031—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 paired plates touching each other
    • F28D9/0043—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 paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another
    • F28D9/005—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 paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another the plates having openings therein for both heat-exchange media

Definitions

  • the present invention relates to a plate heat exchanger comprising at least two separate flow paths for primary and secondary fluids to exchange heat, the said two flow paths being substantially defined by permanently interconnected heat exchanger plates provided with a herring bone pattern of ridges and depressions and offering different pressure drops at equal mass flows of the two fluids.
  • the inlet temperature of the heating water may be e.g. 75° C, and the outlet temperature thereof may be about 60° C.
  • the inlet temperature of the tap water may be about 10° C and the outlet temperature thereof may be 55° C. This indicates that the mass flow of the heating water must be 2.5 times the mass flow of the tap water. Therefore, it is economical to make the cross section of the flow path for the heating water wider than that of the tap water. E.g. by making the tops of the herring bone pattern flat - and thus wider - while the bottoms are unaltered this may be obtained.
  • This known device is adapted to exchange heat between water and a cooling fluid the water flowing through the flow path having the smaller pressure drop.
  • freezing of water will not cause damage to the plate heat exchanger.
  • the areas of contact between plates will thus be relatively great and lost for the heat exchange between the fluids.
  • the small depressions in the channels guiding the water flow will cause corresponding very narrow flow channels in the flow path for the cooling fluid.
  • the areas of contact between adjacent plates are not rigidly interconnected in order to increase the elasticity of the plate heat exchanger, but the mechanical strength of the exchanger will be rather poor making the exchanger unsuitable for high pressure fluids.
  • the Japanese Patent Application No. 11281283 A also discloses a heat exchanger in which the pressure drops of two heat exchanging fluids are different in case of equal mass flows.
  • the flow paths forming a herring bone pattern comprise channels having greater cross sectional flow area provided with two small secondary depressions in the channels of greater cross section. This involves that the flow path having a total relatively high pressure drop will consist of parts causing very different pressure drops. This is an uneconomical way of using the material in the exchanger for exchanging heat. Also - as the pitch will increase with increasing numbers of the secondary depressions - the mechanical strength of the exchanger will decrease due to the smaller numbers of contact points at which the plates could be rigidly connected.
  • the object of the present invention is to design an "asymmetric" plate heat exchanger in which the material of the plates is used in a more economic way and thus in which the efficiency is improved while maintaining a high mechanical strength of the exchanger
  • the depressions in at least some pairs of plates defining the flow path having the lower pressure drop at least partly are alternatively of two different press depths measured from the plan defined by the tops of the ridges of the herring bone pattern of the heat exchanger plate, the smaller being located between two tops of the herring bone pattern and being at least 40 % of the greater, and thereby that the tops of the ridges engaging the tops of a neighboring plate to define a flow channel having high pressure drop substantially contact each other along points defined by crossing lines.
  • Fig. 1 is a plan view of plate in one known type of a plate heat exchanger.
  • Fig.2 schematically shows the crossing patterns of two plates according to Fig, 1 placed on each other - after one of them has been turned in its plan.
  • Fig.3 is a section along the line A-A in Fig. 1.
  • Fig. 4 is a section along the line B-B in Fig. 2 in a stack of four plates according to Fig.1.
  • Fig. 5 is a section corresponding to Fig. 4, but through a known "asymmetric" plate heat exchanger.
  • Fig. 6 is a section corresponding to those of Figs. 4 and 5, but through a plate heat exchanger according to the Japanese Patent Application No. 11 173771 A.
  • Fig. 7 is a section corresponding to Fig. 6, but through a plate heat exchanger according to the Japanese Patent application No. 11281283 A.
  • Fig. 8 shows a section corresponding to those shown in Figs. 4-7 through two neighboring plates of a heat exchanger according to the present invention - the plates being drawn apart.
  • Fig. 9 is a section through four plates in heat exchanger according to the present invention.
  • FIG. 10-12 show alternative embodiments of the invention.
  • Figure 1 is a plan view of a plate 1 of a known and widely used plate heat exchanger provided with a herring bone pattern of ridges 2 and depressions 3.
  • a stack of plates of this type is formed after turning each other plate in the stack in its plane.
  • Figure 2 illustrates how the ridges and depressions then will cross each other.
  • Fig. 3 - which is a section along the line A-A in Fig. 1 - illustrates the pitch P and the press depth D both values being of importance for characterising the plate heat exchanger.
  • Fig. 4 is a section along the line B-B of Fig. 2 through four plates in a heat exchanger according to the Figures 1-3.
  • the two flows of heat exchanging fluids limited by the plates are shown by different hatching. It will be understood that the two flow paths are offering equal pressure drops at equal mass flows.
  • Fig. 6 shows a prior art plate heat exchanger according to the Japanese Patent Application No. 11173771 which shows a plate heat exchanger of the "asymmetric" type in which the pairs of plates limiting the flow path having the greater cross sectional area are provided with depressions of less depths D 2 than the press depths Di of tops of the ridges of the herring bone pattern. This has been done in order to make the plate heat exchanger more resistant against damage caused by ice formations. The plan contact areas between the plates and not used for heat exchange are still existing in this embodiment.
  • Fig. 8 shows a section corresponding to the sections shown in Figs. 4-7 through two heat exchanger plates according to the present invention.
  • a primary press depth press depth - i. e. the distance between the plan defined by the tops of the ridges and the lowest plan defined by bottoms of ridges - has been indicated as Di.
  • a secondary press depth defined as the distance between the plan of the tops of the ridges of the herring bone pattern and a plan of the bottom of minor depressions has been designated by D2.
  • the pitch of the herringbone pattern has been indicated by P.
  • FIG. 9 is a section through four plates 4, 5, 6 and 7 of the types shown in Fig. 8 and corresponding to the sections C-C shown in Figs. 4-7.
  • the three channels formed for the flows exchanging heat are shown by two different hatchings. It will be understood from Fig. 9 that the resistance for the flow limited by the plates 5 and 6 is higher than the resistance for the flow limited by the plates 4 and 5 or 6 and 7.
  • the contact areas between the plates are kept at a minimum, but the number of contacts at which the plates are interconnected by soldering is substantial and will give mechanical strength to the heat exchanger. It is essential to maintain a substantial mass flow of fluid through the cross sections designed by 8 in Fig. 9.
  • the mass flow through the area 8 is nearly proportional to its cross sectional area and this is in turn mainly dependant on the magnitude of the press depth D2.
  • a small press depth D 2 - e.g. as shown in Fig. 7 - will make the areas 8 small and may almost block passage of fluid.
  • a small secondary press depth will the have nearly the same effect as the large contact areas between the ridges of the herring bone pattern shown in Fig. 5.
  • the secondary press depth D 2 should be at least 40 percent of the press depth Di - preferably about 50 percent thereof.
  • Figure 10 is a section corresponding to that of Figure 9, but in which only the plate 4 in a pair of plates 4, 5 has two different press depths.
  • the other plate in the pair - designated by 5 - is of conventional shape having only one press depth.
  • the two plates 4, 5 according to Figure 10 have not patterns which are mirror images of each other and may be designed so that a turning of a plate will not be necessary in order to obtain crossing of the contacting ridges.
  • the secondary press depth D 2 of the plate 5 is greater than the secondary press depth D 3 of the plate 6.
  • Figure 12 shows an embodiment in which the plate 4 has two different secondary press depths.
  • the press depth D 2 is used in one area of the plate and the press depth D 4 in another area of the plate.
  • a heat exchanger according to the present invention may comprise other combinations of pairs of plates than those described above. E.g. some pairs may be of the known type shown in Figure 4 providing equal pressure drops in the flow channels for the heat exchanging media - in case of equal mass flows.

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  • 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)
  • Separation By Low-Temperature Treatments (AREA)
  • Fuel Cell (AREA)

Abstract

A plate heat exchanger comprising separate flow paths for two flows of fluid said paths having different pressure drops at equal mass flows may according to the invention be designed economically by stacking pairs of two plates (4, 5) provided with pressed patterns, at least one of the plates (4) in a pair (4, 5) being provided with at least two different press depths (D1, D2), the smaller (D2) being at least 40% of the greater (D1).

Description

A Plate Heat Exchanger
The present invention relates to a plate heat exchanger comprising at least two separate flow paths for primary and secondary fluids to exchange heat, the said two flow paths being substantially defined by permanently interconnected heat exchanger plates provided with a herring bone pattern of ridges and depressions and offering different pressure drops at equal mass flows of the two fluids.
Many heat exchangers of the above type are used for heating tap water by means of hot water also used for heating dwelling houses. The inlet temperature of the heating water may be e.g. 75° C, and the outlet temperature thereof may be about 60° C. The inlet temperature of the tap water may be about 10° C and the outlet temperature thereof may be 55° C. This indicates that the mass flow of the heating water must be 2.5 times the mass flow of the tap water. Therefore, it is economical to make the cross section of the flow path for the heating water wider than that of the tap water. E.g. by making the tops of the herring bone pattern flat - and thus wider - while the bottoms are unaltered this may be obtained.
Although this making the heat exchanger "asymmetric" is an improvement it is still an object to further increase the efficiency of the exchanger - i.e. to increase the heat transmission between the heat exchanging fluids without increasing the weight of the plate heat exchanger.
The Japanese Patent Application No. 11173771 A published July 2nd, 1999 discloses a plate heat exchanger having different pressure drops in the flow paths in case of equal mass flows.
This is done by increasing the pitch - i. e. the distance between the contacts of adjacent ridges in the herringbone pattern. This known device is adapted to exchange heat between water and a cooling fluid the water flowing through the flow path having the smaller pressure drop. By making small depressions in parts of plates forming the water channels it is obtained that freezing of water will not cause damage to the plate heat exchanger. However, the areas of contact between plates will thus be relatively great and lost for the heat exchange between the fluids. The small depressions in the channels guiding the water flow will cause corresponding very narrow flow channels in the flow path for the cooling fluid. The areas of contact between adjacent plates are not rigidly interconnected in order to increase the elasticity of the plate heat exchanger, but the mechanical strength of the exchanger will be rather poor making the exchanger unsuitable for high pressure fluids.
The Japanese Patent Application No. 11281283 A also discloses a heat exchanger in which the pressure drops of two heat exchanging fluids are different in case of equal mass flows. According to the embodiment in Figure 5 of said disclosure the flow paths forming a herring bone pattern comprise channels having greater cross sectional flow area provided with two small secondary depressions in the channels of greater cross section. This involves that the flow path having a total relatively high pressure drop will consist of parts causing very different pressure drops. This is an uneconomical way of using the material in the exchanger for exchanging heat. Also - as the pitch will increase with increasing numbers of the secondary depressions - the mechanical strength of the exchanger will decrease due to the smaller numbers of contact points at which the plates could be rigidly connected.
The object of the present invention is to design an "asymmetric" plate heat exchanger in which the material of the plates is used in a more economic way and thus in which the efficiency is improved while maintaining a high mechanical strength of the exchanger
According to the present invention this is obtained thereby that the depressions in at least some pairs of plates defining the flow path having the lower pressure drop at least partly are alternatively of two different press depths measured from the plan defined by the tops of the ridges of the herring bone pattern of the heat exchanger plate, the smaller being located between two tops of the herring bone pattern and being at least 40 % of the greater, and thereby that the tops of the ridges engaging the tops of a neighboring plate to define a flow channel having high pressure drop substantially contact each other along points defined by crossing lines. The invention will be described in more detail with reference to the accompanying drawings in which:
Fig. 1 is a plan view of plate in one known type of a plate heat exchanger.
Fig.2 schematically shows the crossing patterns of two plates according to Fig, 1 placed on each other - after one of them has been turned in its plan.
Fig.3 is a section along the line A-A in Fig. 1.
Fig. 4 is a section along the line B-B in Fig. 2 in a stack of four plates according to Fig.1.
Fig. 5 is a section corresponding to Fig. 4, but through a known "asymmetric" plate heat exchanger.
Fig. 6 is a section corresponding to those of Figs. 4 and 5, but through a plate heat exchanger according to the Japanese Patent Application No. 11 173771 A.
Fig. 7 is a section corresponding to Fig. 6, but through a plate heat exchanger according to the Japanese Patent application No. 11281283 A.
Fig. 8 shows a section corresponding to those shown in Figs. 4-7 through two neighboring plates of a heat exchanger according to the present invention - the plates being drawn apart.
Fig. 9 is a section through four plates in heat exchanger according to the present invention.
Figs. 10-12 show alternative embodiments of the invention. Figure 1 is a plan view of a plate 1 of a known and widely used plate heat exchanger provided with a herring bone pattern of ridges 2 and depressions 3. In the exchanger a stack of plates of this type is formed after turning each other plate in the stack in its plane. Figure 2 illustrates how the ridges and depressions then will cross each other.
Fig. 3 - which is a section along the line A-A in Fig. 1 - illustrates the pitch P and the press depth D both values being of importance for characterising the plate heat exchanger.
Fig. 4 is a section along the line B-B of Fig. 2 through four plates in a heat exchanger according to the Figures 1-3. The two flows of heat exchanging fluids limited by the plates are shown by different hatching. It will be understood that the two flow paths are offering equal pressure drops at equal mass flows.
By increasing the pitch P and making the tops 2 of the ridges flat the flow path of one of the fluids will obtain a greater cross section than the flow path of the other fluid.
However, as shown in Fig. 5 the contact areas between the heat exchanger plates will be much larger. These areas cannot be used for heat exchange between the two flows of fluids.
Fig. 6 shows a prior art plate heat exchanger according to the Japanese Patent Application No. 11173771 which shows a plate heat exchanger of the "asymmetric" type in which the pairs of plates limiting the flow path having the greater cross sectional area are provided with depressions of less depths D2 than the press depths Di of tops of the ridges of the herring bone pattern. This has been done in order to make the plate heat exchanger more resistant against damage caused by ice formations. The plan contact areas between the plates and not used for heat exchange are still existing in this embodiment.
Another proposal for manufacturing an "asymmetric" plate heat exchanger has been described in the Japanese Patent Application No. 11281283 A. Here the contact areas between the plates of the exchanger has been established by replacing the plan contact areas by areas containing small depressions. This has been shown in Fig. 7 and it will be understood that the flow path having the greater pressure drop will consist of channels of large cross section and at least the double number of much smaller cross sections. This design is detrimental to the heat transfer in the narrow channels because of the much lower flow rate than in the flow channels having wider cross sections.
Fig. 8 shows a section corresponding to the sections shown in Figs. 4-7 through two heat exchanger plates according to the present invention. A primary press depth press depth - i. e. the distance between the plan defined by the tops of the ridges and the lowest plan defined by bottoms of ridges - has been indicated as Di. A secondary press depth defined as the distance between the plan of the tops of the ridges of the herring bone pattern and a plan of the bottom of minor depressions has been designated by D2. The pitch of the herringbone pattern has been indicated by P.
The herring bone patterns of the two plates 4 and 5 shown in Fig. 8 are mirror images of each other and thus two tools are used for the pressing of the plates. Also each other of the plates should be turned 180 degrees in its plan relative the adjacent plates in the stack in order to obtain the crossing herring bone patterns. Figure 9 is a section through four plates 4, 5, 6 and 7 of the types shown in Fig. 8 and corresponding to the sections C-C shown in Figs. 4-7. The three channels formed for the flows exchanging heat are shown by two different hatchings. It will be understood from Fig. 9 that the resistance for the flow limited by the plates 5 and 6 is higher than the resistance for the flow limited by the plates 4 and 5 or 6 and 7. However, the contact areas between the plates are kept at a minimum, but the number of contacts at which the plates are interconnected by soldering is substantial and will give mechanical strength to the heat exchanger. It is essential to maintain a substantial mass flow of fluid through the cross sections designed by 8 in Fig. 9. The mass flow through the area 8 is nearly proportional to its cross sectional area and this is in turn mainly dependant on the magnitude of the press depth D2. A small press depth D2 - e.g. as shown in Fig. 7 - will make the areas 8 small and may almost block passage of fluid. A small secondary press depth will the have nearly the same effect as the large contact areas between the ridges of the herring bone pattern shown in Fig. 5.
It has been found that the secondary press depth D2 should be at least 40 percent of the press depth Di - preferably about 50 percent thereof.
Figure 10 is a section corresponding to that of Figure 9, but in which only the plate 4 in a pair of plates 4, 5 has two different press depths. The other plate in the pair - designated by 5 - is of conventional shape having only one press depth. The two plates 4, 5 according to Figure 10 have not patterns which are mirror images of each other and may be designed so that a turning of a plate will not be necessary in order to obtain crossing of the contacting ridges.
According to the embodiment of Figure 11 the secondary press depth D2 of the plate 5 is greater than the secondary press depth D3 of the plate 6.
Figure 12 shows an embodiment in which the plate 4 has two different secondary press depths. The press depth D2 is used in one area of the plate and the press depth D4 in another area of the plate.
It will be understood that a heat exchanger according to the present invention may comprise other combinations of pairs of plates than those described above. E.g. some pairs may be of the known type shown in Figure 4 providing equal pressure drops in the flow channels for the heat exchanging media - in case of equal mass flows.

Claims

Claims:
1. A plate heat exchanger comprising at least two separate flow paths for primary and secondary fluids to exchange heat, the said two flow paths being substantially defined by permanently interconnected heat exchanger plates (4-7) provided with a herring bone pattern of ridges and depressions (2, 3) and offering different pressure drops at equal mass flows of the two fluids, c h a r a c t e r i s e d in that the depressions in at least some pairs of plates defining the flow path having the lower pressure drop at least partly are alternatively of two different press depths (Di, D2) measured from the plan defined by the tops of the ridges of the herring bone pattern of the heat exchanger plate, the smaller (D2) being located between two tops of the herring bone pattern and being at least 40 % of the greater (D1), and thereby that the tops of the ridges engaging the tops of a neighboring plate to define a flow channel having high pressure drop substantially contact each other along points defined by crossing lines.
2. A plate heat exchanger according to claim 1, c h a r a c t e r i s e d in, that the smaller press depths (D2) are about 50% of the greater press depths (Di).
3. A plate heat exchanger according to one of the claims 1 and 2 comprising a pair of plates in which only one of the plates has two different press depths. (Fig. 10).
4. A plate heat exchanger according to any of the preceding claims comprising a pair of plates in which the two plates have different secondary press depths. (Fig. 11).
5. A plate heat exchanger according to any of the preceding claims comprising a pair of plates in which one plate has two different secondary press depths. (Fig. 12).
PCT/EP2005/007329 2004-08-28 2005-07-07 A plate heat exchanger WO2006024340A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2007528635A JP2008511811A (en) 2004-08-28 2005-07-07 Plate heat exchanger
US11/632,582 US20080029257A1 (en) 2004-08-28 2005-07-07 Plate Heat Exchanger
AU2005279446A AU2005279446C1 (en) 2004-08-28 2005-07-07 A plate heat exchanger

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04020494.3A EP1630510B2 (en) 2004-08-28 2004-08-28 A plate heat exchanger
EP04020494.3 2004-08-28

Publications (1)

Publication Number Publication Date
WO2006024340A1 true WO2006024340A1 (en) 2006-03-09

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ID=34926346

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PCT/EP2005/007329 WO2006024340A1 (en) 2004-08-28 2005-07-07 A plate heat exchanger

Country Status (17)

Country Link
US (1) US20080029257A1 (en)
EP (1) EP1630510B2 (en)
JP (1) JP2008511811A (en)
KR (1) KR20070048707A (en)
CN (1) CN100513968C (en)
AT (1) ATE350639T1 (en)
AU (1) AU2005279446C1 (en)
CY (1) CY1106418T1 (en)
DE (1) DE602004004114T3 (en)
DK (1) DK1630510T3 (en)
ES (1) ES2279267T5 (en)
MY (1) MY136232A (en)
PL (1) PL1630510T5 (en)
PT (1) PT1630510E (en)
SI (1) SI1630510T1 (en)
TW (1) TWI320089B (en)
WO (1) WO2006024340A1 (en)

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US20080029257A1 (en) 2008-02-07
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