EP2363674A1 - Wärmetauscher - Google Patents

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Publication number
EP2363674A1
EP2363674A1 EP10155255A EP10155255A EP2363674A1 EP 2363674 A1 EP2363674 A1 EP 2363674A1 EP 10155255 A EP10155255 A EP 10155255A EP 10155255 A EP10155255 A EP 10155255A EP 2363674 A1 EP2363674 A1 EP 2363674A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
wall
ring
heat exchanger
accordance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10155255A
Other languages
English (en)
French (fr)
Inventor
Koenraad Jan Jansen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Scheepswerf van de Giessen BV
Original Assignee
Scheepswerf van de Giessen BV
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
Application filed by Scheepswerf van de Giessen BV filed Critical Scheepswerf van de Giessen BV
Priority to EP10155255A priority Critical patent/EP2363674A1/de
Publication of EP2363674A1 publication Critical patent/EP2363674A1/de
Withdrawn legal-status Critical Current

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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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0358—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by bent plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
    • B63H21/383—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like for handling cooling-water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/14—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in non-rotating ducts or rings, e.g. adjustable for steering purpose
    • B63H5/15—Nozzles, e.g. Kort-type
    • 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/0206—Heat exchangers immersed in a large body of liquid
    • F28D1/022—Heat exchangers immersed in a large body of liquid for immersion in a natural body of water, e.g. marine radiators
    • 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D2001/0253—Particular components
    • F28D2001/026—Cores
    • F28D2001/0273—Cores having special shape, e.g. curved, annular

Definitions

  • the invention concerns a heat exchanger in accordance with the preamble of claim 1.
  • the document JP 58183816 discloses such a heat exchanger.
  • the disadvantage of the known heat exchanger is that the first fluid flow in the nozzle flows along a small part of the top surface of the rear of the nozzle and then flows back along the top of the front of the nozzle and then back towards the heat generating equipment. This means that in the lower half of the nozzle there is locally almost no first fluid flow, this limits the heat exchange capacity of the nozzle.
  • the device is according to claim 1.
  • the cooling surface along the length of the cooling channel is approximately constant which leads to an approximately constant cooling capacity for cooling the first fluid and the complete nozzle surfaces contributes to the heat exchange between the first fluid and the second fluid. This avoids local areas with no or limited first fluid flow that cause areas with reduced heat exchange and strongly reduced cooling capacity of the nozzle.
  • the heat exchanger is according to claim 2. In this way, the flow speed in the cooling channel is approximately constant, which improves the heat exchange.
  • the heat exchanger is according to claim 3.
  • the ring-shaped chamber has a reduced longitudinal cross section so that the flow speed of the first flow is higher which increases the heat exchange with the second flow.
  • the heat exchanger is according to claim 4.
  • the first flow flows full circles around the nozzle and circulates first through a first ring-shaped chamber and then through a second ring-shaped chamber and if applicable to the next ring-shaped chamber and the temperature of the first flow diminishes in the longitudinal direction of the nozzle.
  • the temperature might be highest at the rear side of the nozzle, which improves the heat transfer between the first fluid flow and the second fluid flow.
  • the heat exchanger is according to claim 5.
  • the forward surface and/or the rearward surface of the nozzle are effective for exchanging heat.
  • the heat exchanger is according to claim 6.
  • the inner walls and the outer walls are reinforced so that oscillations or deformations are prevented.
  • the location of the openings ensures a higher flow speed near the walls, which improves the heat exchange between the first fluid and the walls.
  • the heat exchanger is according to claim 7.
  • the second fluid circulates within the inner wall with a speed that is as high as possible and the exchange of heat between the first fluid and the second fluid increases.
  • the heat exchanger is according to claim 8.
  • the support maintains the circular shape of the nozzle and prevents deformations and/or oscillations, so that the gap between the propeller and the nozzle can be very small and the speed of the second fluid flow along the inner wall equals the tip speed of the propeller, which increases the heat exchange capacity.
  • the heat exchanger is according to claim 9. In this way, the longitudinal stiffness of the attachment of the nozzle to the ship is as high as possible and resistance against deformations is maximal.
  • Figure 1 shows a propeller 3 at the stern of a ship 1.
  • a shaft (not shown) with a centreline 10 rotates the propeller 3 and a shaft support 9 supports the shaft.
  • An engine (not shown) rotates the shaft and a cooling fluid conveys the heat generated by the engine to the water that flows alongside the ship.
  • a ring-shaped nozzle surrounds the propeller 3.
  • a support 2 connects the nozzle to the ship 1.
  • the nozzle has a nozzle front 8 and a nozzle rear 5, an inside surface 4 and an outside surface 6.
  • On the outside surface 6 and the shaft support 9 are anodes 7 to prevent or reduce corrosion.
  • the cooling fluid flows through the internal construction of the nozzle.
  • Figure 2 shows a typical cross section of the nozzle with the inside surface 4 formed by an inner wall 17 that ends at the nozzle front 8 against a front profile 8'.
  • the inner wall 17 ends at the nozzle rear 5 against a rear profile 5'.
  • An outer wall 16 between the front profile 8' and the rear profile 5' forms the outside surface 6.
  • a first ring-shaped wall 14 and a second ring-shaped wall 15 form with the inner wall 17 and the outer wall 16 a ring-shaped front chamber 13, a ring-shaped middle chamber 12 and a ring-shaped rear chamber 11.
  • the cooling fluid flows through the ring-shaped chambers 11, 12, and 13.
  • the nozzle has one or more reinforcement walls 20' in longitudinal direction (see figure 3 ) there are one or more outside flow openings 18 between the outer wall 16 and the reinforcement wall 20' and one or more inside flow openings 19 between the inner wall 17 and/or the reinforcement wall 20'.
  • the inner wall 17 and the outer wall 16 form the heat exchanging surfaces between the cooling fluid in the nozzle and the water around the nozzle.
  • the heat-exchanging surface has an approximately constant surface area for each cross-section in the direction of the fluid flow so that the heat exchanging capacity remains more or less constant along the length of the fluid flow.
  • Approximately constant surface area means that the heat-exchanging surface area may fluctuate around an average value with plus or minus 50% or plus or minus 30%. It will be clear that the total less fluctuation in the heat-exchanging surface area will mean that the average is higher and that this increases the heat exchanging capacity of the nozzle.
  • the cross section area perpendicular to the fluid flow is more or less constant in the three ring-shaped chambers. This means that the cross section area may fluctuate around an average value with plus or minus 50% or plus or minus 30%.
  • the more or less constant cross section area leads to a more or less constant flow speed of the fluid flow, which means there is less fluctuation in the fluid flow speeds so that the average flow speed is higher, which increases the heat exchanging capacity of the nozzle.
  • Figures 3, 4, and 5 show the nozzle in different views.
  • a partition wall 20 limits the circular flow through ring-shaped chambers 11, 12, and 13 and guides the cooling fluid near the partition wall 20 through a first opening 25 that connects the ring-shaped front chamber 13 and the ring-shaped middle chamber 12.
  • a second opening 25 connects the ring-shaped middle chamber 12 and the ring-shaped rear chamber 11.
  • a cooling fluid inflow line 21 connects to the ring-shaped rear chamber 11 and a cooling fluid outflow line 22 connects to the ring-shaped front chamber 13.
  • the channel for the cooling fluid flow inside the nozzle has an approximately constant cross section area so that the cooling fluid flows with an approximately constant flow speed through the channel. This means that the flow speed along the length of the channel is over the whole length near its maximum value, which improves the heat exchange.
  • FIG. 6 shows a cooling fluid flow 24 around the propeller 3 in a circular shaped cooling channel through the internal structure of the nozzle.
  • the propeller 3 generates a water flow 23 along the inside surface 4 of the nozzle, this flow is in the longitudinal direction of the nozzle and has a rotational component due to the rotation of the propeller.
  • the cooling fluid where it is leaving the nozzle has exchanged heat with the water flow 23 entering the nozzle, which means that the cooling of the cooling fluid is most effective as the average temperature difference between the cooling fluid flow 24 and the water flow 23 is as high as possible.
  • the cooling fluid can follow different patterns of flow in the nozzle.
  • the many ring-shaped chambers result in a high flow speed of the cooling fluid and for instance two ring shaped chambers around the propeller are parallel.
  • partitions in the inside of the nozzle between the inner wall 17 and the outer wall 16 around the circumference of the nozzle.
  • the distance between the partitions is less than three times and possibly less than twice the distance between the inside wall 17 and the outside wall 16.
  • a support is mounted on the inner wall 17 of the nozzle to support the propeller 3 and the support includes a bearing for a drive axis of the propeller 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP10155255A 2010-03-02 2010-03-02 Wärmetauscher Withdrawn EP2363674A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10155255A EP2363674A1 (de) 2010-03-02 2010-03-02 Wärmetauscher

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10155255A EP2363674A1 (de) 2010-03-02 2010-03-02 Wärmetauscher

Publications (1)

Publication Number Publication Date
EP2363674A1 true EP2363674A1 (de) 2011-09-07

Family

ID=42563278

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10155255A Withdrawn EP2363674A1 (de) 2010-03-02 2010-03-02 Wärmetauscher

Country Status (1)

Country Link
EP (1) EP2363674A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014080218A1 (en) * 2012-11-23 2014-05-30 Bwm Ribs Ltd Water craft jet pump heat exchanger

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2682852A (en) * 1952-05-22 1954-07-06 Mario A Ruffolo Marine engine cooling device
GB1125996A (en) * 1966-03-12 1968-09-05 H C F Porsche K G Ing Propulsion units for water-borne craft
DE2355974A1 (de) * 1973-11-09 1975-05-22 Becker Kg Gebr Kuehler fuer den antriebsmotor der querschubanlage eines schiffes
JPS58183816A (ja) 1982-04-19 1983-10-27 Yanmar Diesel Engine Co Ltd 舶用デイ−ゼル機関の冷却装置
GB2260805A (en) * 1991-10-25 1993-04-28 Thos Storey Heat exchanger defined by a marine propeller shroud
GB2363453A (en) * 2000-06-17 2001-12-19 Gibbs Tech Ltd Marine engine cooler in water jet drive stator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2682852A (en) * 1952-05-22 1954-07-06 Mario A Ruffolo Marine engine cooling device
GB1125996A (en) * 1966-03-12 1968-09-05 H C F Porsche K G Ing Propulsion units for water-borne craft
DE2355974A1 (de) * 1973-11-09 1975-05-22 Becker Kg Gebr Kuehler fuer den antriebsmotor der querschubanlage eines schiffes
JPS58183816A (ja) 1982-04-19 1983-10-27 Yanmar Diesel Engine Co Ltd 舶用デイ−ゼル機関の冷却装置
GB2260805A (en) * 1991-10-25 1993-04-28 Thos Storey Heat exchanger defined by a marine propeller shroud
GB2363453A (en) * 2000-06-17 2001-12-19 Gibbs Tech Ltd Marine engine cooler in water jet drive stator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014080218A1 (en) * 2012-11-23 2014-05-30 Bwm Ribs Ltd Water craft jet pump heat exchanger
GB2508196B (en) * 2012-11-23 2015-08-12 Bwm Ribs Ltd Water craft jet pump heat exchanger

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