EP2185883A1 - Échangeur de chaleur - Google Patents

Échangeur de chaleur

Info

Publication number
EP2185883A1
EP2185883A1 EP08784462A EP08784462A EP2185883A1 EP 2185883 A1 EP2185883 A1 EP 2185883A1 EP 08784462 A EP08784462 A EP 08784462A EP 08784462 A EP08784462 A EP 08784462A EP 2185883 A1 EP2185883 A1 EP 2185883A1
Authority
EP
European Patent Office
Prior art keywords
fluid
heat exchanger
exchanger unit
heat
unit according
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Withdrawn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
EP08784462A
Other languages
German (de)
English (en)
Inventor
Finn Beldring
Christian Rasmussen
Mark Peter Brown
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.)
Grundfos Management AS
Original Assignee
Grundfos Management AS
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 Grundfos Management AS filed Critical Grundfos Management AS
Publication of EP2185883A1 publication Critical patent/EP2185883A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0012—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 apparatus having an annular form
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0093—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
    • 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
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
    • F28F13/125—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation by stirring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/08—Fluid driving means, e.g. pumps, fans

Definitions

  • the present invention relates to an apparatus and a method for exchanging heat between at least two fluids.
  • the invention relates in particular to a heat exchanger unit for exchanging heat between a first fluid and a second fluid, which unit comprises preferably one or more heat transferring elements having a first fluid contact surface and a second fluid contact surface through which heat is conducted from the first to the second fluid or vice versa, one or more total pressure increasing means for increasing the total pressure of at least one of the fluids at least locally in the heat exchanger unit, and a casing encapsulating the one or more heat transferring elements and the one or more total pressure increasing means.
  • the invention furthermore relates to heat transferring elements, heat exchangers comprising such heat transferring elements and a cassette comprising at least one or more heat transferring elements.
  • Heat exchange between fluids takes place in a number of processes.
  • the fluids are separated from each other by an interface being impenetrable for the fluids in question, and the heat transfer from one fluid to the other occurs through this impenetrable interface.
  • the heat transfer rate is strongly coupled to the velocity of the fluids flowing past the interface and in particular the velocity in the boundary layer close to the interface.
  • the surface of the interface may be given certain characteristics such as being corrugated.
  • the heat exchanger unit represents a pressure loss that need to be compensated for to enable the fluid to flow through the unit. This is typically done by assigning one or more pumps to drive the fluid through the unit.
  • a heat transfer system is accordingly assembled by connecting a number of stand-alone units, such as one or more pumps and one or more heat exchanger units by use of pipes, flanges and the like. Each such connection typically represents a loss in pressure, e.g. due to a change in flow cross section.
  • a connection may furthermore be subjected to sealing problems e.g. where the piping and the stand alone units are connected to each other. In fig.
  • Ia which shows schematically a commonly known heat exchanger system
  • the various fluid dynamic processes are indicated in systems connected by use of pipes, flanges and the like.
  • the processes are illustrated at three levels of details with increasing detailing from top to the bottom of the figure.
  • a graph showing the pressure of the fluid is indicated.
  • Ptot refers to total pressure
  • Pstat refers to static pressure
  • Pdyn refers to dynamic pressure.
  • a pump (P) is provided upstream and connected to the heat exchanger unit (HE) by a pipe, and the impeller increases the pressure and in particular the dynamic pressure.
  • the dynamic pressure is converted into static pressure in a diffuser of the pump.
  • the fluid with high static pressure is fed into a heat exchanger in which the velocity of the fluid is increased due to a decrease in cross sectional area.
  • the static pressure decreases and the dynamic pressure increases.
  • Such conversions from dynamic pressure to static pressure to dynamic pressure result in losses which in general must be balanced by e.g. electrical power for driving a motor of the pump; such losses are energy consuming and thereby undesirable.
  • US 2006/0254752 discloses a radiator including: an inlet header having a hollow shape and being provided with an inlet for a coolant to enter; a plurality of flat tubes connected to the inlet header at one end; and an outlet header having a hollow shape and being provided with an outlet for the coolant to discharge, the outlet header connecting to another end of the plurality of flat tubes.
  • the plurality of flat tubes form channels for the coolant and connect the inlet header and the outlet header. While the invention disclosed therein may provide some advantageous effect it does not seem to provide much flexibility as to design and relies heavily on one of the fluids being air.
  • heat exchangers seem have to have an upper heat transfer limit of 4000 W/m 2 K which limit might be linked to the use of connecting stand alone unit (pumps and heat transfer unit).
  • the present invention relates in a first aspect to a heat exchanger unit for exchanging heat between a first fluid and a second fluid, the unit comprising preferably a flow passage for the first fluid and a flow passage for the second fluid, the flow passages are connected to inlets and outlets of the heat exchanger unit through which the first and the second fluid flow into and out of the heat exchanger unit, one or more heat transferring elements having a first fluid contact surface and a second fluid contact surface through which surfaces heat is conducted from the first to the second fluid or vice versa, the contact surfaces form at least part of the flow passages, one or more total pressure increasing means for increasing the total pressure of at least one of the fluids at least locally in the heat exchanger unit, and - a casing encapsulating the one or more heat transferring elements and one, some or all of the one or more total pressure increasing means.
  • the temperature of the first and second fluids will be different when they leave the heat exchanger unit via outlets compared to when they enter the heat exchanger unit via inlets.
  • the total pressure of at least one of the fluids is increased at least locally by total pressure increasing means.
  • the total pressure increasing means provide(s) a rotational flow in at least one of the fluids which rotational flow has been found to have a positive effect on the heat exchange between the fluids.
  • a heat exchanger unit has a casing which preferably may be considered as a container like structure inside which one or more heat transferring element(s) and one or more total pressure increasing means are arranged.
  • the heat exchange between the fluids will typically result in a pressure loss e.g. due to a flow path including bends and the like, and the total pressure increasing means is/are preferably used to overcome at least the pressure loss resulting from at least one of the fluids flowing through the heat exchanger unit.
  • the present invention is designed so that it preferably comprises a pressure carrying casing inside which the heat transferring elements and total pressure increasing means are arranged, whereby the unit may be made more compact and efficient.
  • the efficiency of the unit may furthermore be increased as the number of heat transferring elements may be chosen so that a given demand may be matched more accurately than by building a heat exchanging unit from a number of stand-alone units.
  • a number of terms are used. Although these terms are used in a manner ordinary to a person skilled in the art, a brief explanation of some of these terms will be presented below.
  • Fluid is used to designate at least a liquid, a gas, a fluidized medium or combinations thereof.
  • Flow passage is preferably used to designate the hollow space through which a fluid flows within the heat exchanger unit.
  • the flow passage preferably comprises one or more channels which channels may be arranged in parallel and/or in series.
  • the channels comprise fluid contact surfaces through which the heat is conducted.
  • Casing is preferably used to designate the wall of the heat exchanger unit which wall confines fluid in the heat exchanger unit so that fluid may flow out of and into the processing unit through one or more inlets and outlets provided in the casing.
  • the casing thereby preferably forms a sealed encapsulation of the heat exchanger unit.
  • the casing may preferably comprise a number of wall elements. At least part of the casing may preferably constitute a part of the flow passages of the heat exchanger.
  • Cassette is preferably used to designate an element which either contains one or more heat exchanger elements, is adapted to receive one or more heat transferring elements or both.
  • a cassette typically comprises an outer housing arranged so as to form at least part of the casing, one or more inlets and one or more outlets.
  • the outer housing may preferably be pressure carrying in the sense that no further casing is needed to withstand the pressure difference between the interior and exterior of the cassette.
  • the outer housing typically and preferably contributes in defining the flow passage through the unit.
  • a cassette is shaped so that it comprises one or more flow passages through the cassette from its inlet to its outlet - which one or more flow passages form part of one or more of the flow passages in the unit.
  • the inlet(s) and outlet(s) of cassettes are preferable provided so that when two cassettes are combined, the outlet(s) of one cassette is/are directly connected to the inlet(s) of the other cassette and vice versa.
  • “Directly connected” is preferably used to designate a situation where the velocity and pressure of the fluid flowing out of the outlet is the same as the velocity and pressure of the fluid flowing into the inlet, which e.g. may be provided by connecting the outlet and inlet with each other with no intermediate piping in between.
  • the outer casings of the cassettes are preferably combined to form at least part of the pressuring carrying casing of the processing unit.
  • the assembled unit may often be pressure neutral to the process in which it is to operate.
  • the cassette is preferably designed, so that flow of at least one of the fluids through the cassette is pressure neutral or the pressure of the fluid in question flowing through the cassette is even increased.
  • Total pressure increasing means is preferably used to designate an element increasing the total pressure (stagnation pressure) of a fluid.
  • a total pressure increasing means preferably is or comprises a fluid velocity inducer, such as an impeller. Fluid velocity inducer is preferably used to designate an element inducing velocity to the fluid so that its direction and/or total pressure is changed.
  • a fluid velocity inducer is preferably an impeller.
  • Inlet/outlet is preferably used to designate a cross section or a region where fluid flows into or out of an element or unit.
  • the inlet/out may preferably be an end cross section or a region of a pipe, channel or the like.
  • Inlet and outlet may preferably also be considered as the sections of a control volume through which fluid flow into the element/out of the element which control volume encircling the element or unit in question.
  • heat transfer occur at locations where the fluids have relatively high velocities and at least one or both fluids typically also flow in a swirling motion; both flow patterns are found to be beneficial to the heat transfer rate.
  • the unit may be configured so that either one or both of the fluids may be pumped through the unit by total pressure increasing means arranged inside the unit. Therefore, the present invention typically provides a compact heat exchanger unit which may be adapted to be pressure neutral for the process in the sense that no further pressurisation means, such as pumps, is needed to drive the fluid(s) through the unit.
  • heat exchanger units according to the present invention are found to be easily scalable to meet a given heat transfer demand. For instance, the unit may be configured by arranging a number of heat transferring elements which in common meets the heat transfer demand in a casing into which the heat elements fits; or the unit may be configured by stacking a number of cassettes containing a number of heat transferring element.
  • the heat transferring element(s) may preferably be plate shaped and comprise fluid channels forming part of the flow passages for the first and the second fluids. These channels preferably extend from one side of the heat transferring element to the other side of the heat transferring element. Thereby, the first and the second fluid flow from one side of the heat transfer element to the other side through the heat transfer element.
  • the first fluid contact surface of each heat transferring element may be an inner surface of at least one channel provided in the heat transferring element, which channel has a channel inlet and a channel outlet.
  • Heat exchanger units according to the present invention may preferably comprise a stack of at least two heat transferring elements which are connectable so that the first fluid flows from the channel outlet of one heat transferring element to the channel inlet of the consecutive heat transferring element.
  • the outlet of one channel may be connected or connectable to the inlet of the consecutive channel via connection stubs, so that the first fluid may flow from an inlet pipe to a first heat transferring element via connection stub(s) and from a last heat transferring element to an outlet pipe via connection stub(s).
  • the first fluid may preferably be pumped through the heat transferring unit by a pump arranged outside the casing of the heat exchanger unit.
  • the heat transferring element(s) may in many preferred embodiment be substantially disc-shaped (not necessarily having an circular outer rim) and comprise a hole, preferably being centrally arranged, wherein the at least one total pressure increasing means is placed in such a way that it transports the second fluid flow from one side of the heat transferring element to the other.
  • the heat transferring element may comprise a guide plate forming a channel leading the second fluid towards the total pressure increasing means.
  • At least a part of the casing forms a part of the flow passage for the second fluid.
  • the one or more of the total pressure to increasing means may preferably be adapted to increase the pressure of the second fluid to an extent at least partially overcoming the pressure loss due to fluid flowing through the heat exchanger unit. Additionally, the one or more total pressure increasing means may be adapted to increase the pressure of the second fluid to an extent at least overcoming the pressure loss due to the fluid flowing through the heat exchanger unit.
  • the total pressure increasing means may comprise or may be constituted by one or more fluid velocity inducers.
  • One, more or all of the fluid velocity inducers may preferably be adapted to receive one of the fluids at one velocity and deliver the fluid at a higher velocity.
  • One or more of the fluid velocity inducer(s) may preferably be arranged relatively to second fluid contact surface so that the dynamic pressure of the second fluid is substantially the same when the fluid initially contacts the second contact surface as when the fluid leaves the fluid velocity inducer.
  • one or more, and in some embodiments all, of the one or more fluid velocity inducers may preferably be impellers.
  • the impeller(s) may preferably be /impeller(s) with a motor-driven rotational motion.
  • the impeller(s) may preferably be mounted on a motor-driven shaft in such a way that the axis of rotation of the shaft and the impellers are coincident.
  • the casing may preferably be a pressure carrying casing adapted to resist the pressure difference between the pressure of the fluids in the heat exchanger unit and the pressure outside the heat exchanger unit.
  • the casing or at least a part thereof may be tubular shaped.
  • the casing may preferably comprise a pressurization stage preferably comprising one or more impellers, said pressurisation stage being placed so that at least one of the fluids passes there through before it flows to the one or more heat transferring element(s).
  • a number of heat transferring elements may preferably be stacked with a distance between each heat transferring element so as to provide channels between two neighbouring elements, the channels being at least a part of the flow passages for the first and the second fluid and surfaces of the heat transferring elements facing towards the channels constitute at least a part of the fluid contact surfaces, each heat transferring element is at its rim preferably sealed to a casing and the unit comprising a number of connection stubs allowing fluid to flow from one channel to a channel located upstream of a neighbouring channel.
  • Total pressure increasing means may preferably be arranged in one or more channel(s) and the heat transferring elements may preferably be disc shaped (not necessarily having a circular outer rim).
  • the heat transferring elements may in general be adapted to be rotated.
  • At least a part of the surface of the first fluid contact surface and/or the second fluid contact surface may preferably be manufactured to have a roughness being smooth or rough.
  • at least a part of the first fluid contact surface and/or the second fluid contact surface may be corrugated.
  • the material(s) of the heat transferring elements may preferably be selected from metal, composites materials, coated material, plastic, ceramics or combinations thereof.
  • the unit may preferably comprising one or more cassettes each containing a number of heat transfer element.
  • an outer housing of one or more of the cassettes may form at least a part of an outer surface of the casing.
  • an outer housing of one or more of the cassettes forming at least a part of the casing may preferably abut an interior surface of the casing.
  • One or more of the cassettes may preferably comprise total pressure increasing means.
  • One or more of the cassettes may be adapted to maintain and/or provide a rotating flow, such as a swirling flow, in at least a part of one or both flow passages.
  • One or more of the cassettes may preferably be adapted to receive or the cassette may comprise a fluid velocity inducer, the fluid velocity inducer constituting at least a part of one or both flow passages.
  • the fluid velocity inducer may preferably be adapted to receive fluid at one velocity and deliver the fluid at a higher velocity.
  • first and the second fluid contact surfaces may preferably be impermeable to fluid.
  • At least a part of the flow passages comprising the contact surfaces may preferably extend in a curved manner in one geometrical plane.
  • Heat exchanger units according to the present invention may preferably be adapted to provide a rotating flow, such as a swirling flow past at least one or both contact surfaces.
  • the total pressure increasing means may in preferred embodiments be adapted to increase the total pressure of the fluid(s) flowing through the unit, so that the fluid(s) leaving the unit has(have) a higher total pressure than when the fluid(s) flows into the unit.
  • the present invention relates to a heat transfer element preferably comprising a first fluid contact surface and a second fluid contact surface through which surfaces heat is conducted from the first to the second fluid or vice versa, wherein - the first contact surface is an inner surface of at least one channel provided in the heat transferring element, which channel has an inlet and an outlet, the second contact surface is at least a part of the outer surface of the at least one channel being provided in the heat transferring element.
  • the heat transferring element may preferably be substantially disc-shaped (not necessarily having a circular outer rim) and may preferably comprises a hole, preferably being centrally arranged, wherein at least one total pressure increasing means preferably can be arranged in such a way that it transport a fluid from one side of the heat transferring element to the other.
  • Heat transferring elements according to the second aspect of the invention may preferably one or more the features disclosed above in relation to the first aspect of the invention.
  • the present invention relates to a cassette comprising one or more of the features disclosed in connection with the first and/or the second aspect of the invention.
  • the invention in a fourth aspect, relates to a method of exchanging heat between a first and a second fluid, the method preferably comprising feeding fluids to a heat exchanger unit according to the above disclosed aspect of the invention.
  • Fig. Ia shows schematically a commonly known heat exchanger system
  • fig. Ib shows schematically flow in heat exchangers according to preferred embodiments of the present invention
  • Fig. 2 shows a heat transferring element of a heat exchanger unit according to an embodiment of the present invention; the heat transferring elements are seen obliquely from above (fig. 2a) and below (fig. 2b), respectively.
  • Fig. 3 is a schematic illustration of a stack of heat transferring elements of a heat exchanger unit according to a preferred embodiment of the present invention. For clarity the elements are shown spaced apart, whereas in practise they abut each other mutually as shown in fig. 7. Furthermore, a part of the casing has been removed to render the heat transferring elements visible.
  • Fig. 4 shows the heat transferring elements of fig. 3 seen obliquely from below and with the casing removed for clarity.
  • Fig. 5 illustrates the flow path of the first fluid flowing in the channels of the heat transferring elements shown in fig. fig. 3.
  • Fig. 6 illustrates the flow path of the second fluid flowing between the heat transferring elements shown in fig. 3.
  • Fig. 7 shows an embodiment of a section of a heat exchanger unit according to the present invention.
  • Fig. 7. a is a top view
  • fig. 7.b is a sectional view along line A-A in fig. 7. a.
  • Fig. 8 shows schematically a side view of a heat exchanger unit according to the present invention.
  • Fig. 9 shows schematically a cross sectional view of a part of a heat exchanger unit according to the present invention with a pressurisation stage for pumping one of the fluids through the heat exchanger unit.
  • Fig. 10 shows an exploded view of an embodiment of a section of heat exchanger unit with impellers for pumping two fluids through the unit according to the present invention, the unit comprising impellers for pumping the two fluids through the unit,.
  • Fig. 11 shows schematically an embodiment of a heat exchanger according to the present invention wherein the unit is made from a number of cassettes
  • Fig. 12 shows a cross sectional view of the heat exchanger unit shown in fig. 11,
  • Fig. 13 shows an exploded view of a preferred embodiment of a section of a heat exchanger unit according to the present invention for exchanging heat between three fluids, the unit comprising impellers for pumping the three fluids through the unit
  • Fig. 14 shows an exploded view of a further embodiment of a section of a heat exchanger unit according to the present invention.
  • a heat exchanger unit 13 (see fig. 8) according to a preferred embodiment of the present invention comprises at least one and preferably a larger number of heat transferring elements 1 which may have a design as illustrated in fig. 2.
  • Fig. 2. a and fig. 2.b show the heat transferring element 1 seen obliquely from above and from below, respectively; "above” and “below” refers to the orientation of the heat exchanging unit in fig. 7.
  • the heat transferring elements 1 have channels 2 for guiding a first fluid along a first fluid contact surface which is the internal surface of the channel 2 and therefore not directly visible in the figure.
  • each channel 2 extends in a curved manner in one geometric plane.
  • Each channel 2 comprises a channel inlet 3 through which the first fluid enters the channel 2 and a channel outlet 4 through which the first fluid exits the channel 2.
  • the channel outlet 4 and channel inlet 3 comprise fluid guides in form of connection stubs 5 (see fig. 3) which are connectable so that the heat transferring elements 1 are stackable, and the first fluid can flow from a channel 2 of one heat transferring element 1 to a channel 2 of a consecutively arranged heat transferring element 1. This is described in more detail below.
  • the heat transferring elements 1 preferably abut and thereby support each other at support bosses 6, but it is also possible within the scope of the invention that they only abut at the channel inlets and outlets (3, 4).
  • the heat transferring element 1 comprises a central hole 7 for placing an impeller 8 (see fig. 4), the function of which is described below.
  • Fig. 3 shows a stack of three heat transferring elements 1 together with the inlet and outlet pipes 9, 10 for the first fluid.
  • the heat transferring elements 1 are shown spaced apart and the impellers 8 being removed (see fig. 4), whereas in practise they abut each other mutually as shown in fig. 7.
  • the rims 11 of the heat transferring elements 1 abut a circumferential casing 12 and are preferably sealed to the casing at the rims 11.
  • a part of the casing 12 has been removed to render visible the heat transferring elements 1.
  • Fluid velocity inducers in the form of impellers 8 are arranged along a rotatable common shaft (not shown; see fig. 9) so that when the shaft is rotated, typically by a motor (not shown; see fig. 8), the impellers 8 transport a second fluid from the bottom (relatively to the orientation of the figure) to the top of the heat exchanger unit 13.
  • the fluid velocity inducers increase the total pressure of the fluid flowing through the fluid velocity inducers.
  • the second fluid leaves an impeller 8, the second fluid contacts the second fluid contact surface of the heat transferring element 1, this surface being the outer and thereby directly visible surface; i.e. visible in the figure.
  • Fig. 4 shows the heat transferring elements 1 of fig. 3 seen obliquely from below and with the casing 12 removed for clarity and with impellers mounted.
  • a guide plate 14 has been mounted to the channel 2 of each heat exchanger element 1 to guide the second fluid towards the impellers 8.
  • this guide plate 14 is made integral with the remaining heat transferring element 1.
  • the flow passage of the first fluid through the heat exchanger unit 13 of figs. 3 and 4 is illustrated by a broken line in fig. 5. It enters the heat exchanger unit 13 through an inlet in form of an inlet pipe 9 from where it flows to the channel 2 of the upper heat transferring element 1 via one or more connection stubs 5.
  • the first fluid flows through the consecutive heat transferring elements 1 as illustrated, and from the last heat transferring element 1, it flows out through an outlet in form of an outlet pipe 10.
  • the flow of the first fluid is typically caused by a pump (not shown) placed external to the heat exchanger unit 13, but the pump may also be integrated in the heat exchanger unit 13 e.g. in a manner similar to what is disclosed in fig. 9 (pressurisation stage 25) or as shown in fig. 10.
  • the first fluid exchanges heat/energy with a second fluid flowing between the heat transferring elements 1, i.e. along their second fluid contact surfaces.
  • the flow passage of the second fluid is illustrated schematically in fig. 6.
  • the second fluid enters the central region of the first impeller 8 which is rotatable e.g. by means of a motor driven shaft (not shown; see fig. 8, 9).
  • the centre axis of the shaft is coincident with the centre axis of the impellers 8, and the second fluid preferably flows towards the impellers 8 along the whole periphery of the shaft. This is indicated with one central arrow in the figure for illustrative purposes only.
  • the rims 11 are sealed to the casing so as to define a channel between two neighbouring heat transferring elements 1.
  • the impeller 8 induces energy to the second fluid which makes it flow towards the rim 11 of the heat transferring element 1. From here it flows into the space partly defined by the guide plate 14. This flow is mainly obtained by a draw from the impeller 8 placed in the consecutive heat transferring element 1, and from there the flow pattern is repeated.
  • the heat transferring elements 1 are plate shaped elements having channels for the first and the second fluid respectively forming part of the flow passages for the first and the second fluids and extending from one side of the heat transferring element to the other side of the heat transferring element so that the first and the second fluid can flow from one side of the element to the other.
  • One of the channels is the channel 2 with channel inlet 3 and channel outlet 4, and another channel is defined by the space partly defined by the guide plate 14, the hole 7 and, if arranged, the impeller 8.
  • Fig. 7 shows a section of an embodiment of a heat exchanging unit 13 according to the present invention.
  • fig. 7. a the section of the heat exchanging unit 13 is seen from above, and fig. 7.b is a sectional view along line A-A in fig. 7. a.
  • the channel 2 of the last heat transferring element 1 is slightly longer than the others, since this channel 2 is connected to the outlet pipe 10 as illustrated in fig. 7.b.
  • the section of the heat exchanger unit 13 is shown integrated with casing elements 17, 19 comprising inlet 15 an outlet 16 for the second fluid in fig. 8.
  • the flow of the second fluid along the second fluid contact surface has a radial and a tangential velocity component. Furthermore, the second fluid flowing out of the impeller comes in direct contact with the second fluid contact surface with no conversion of dynamic pressure into static pressure before contact between the surface and fluid is made.
  • Fig. 8 shows a preferred embodiment of a heat exchanger unit according to the present invention.
  • the heat exchanger unit 13 comprises a casing 12 having three casing elements, a first casing element 17, an intermediary casing element 18, and a second casing element 19.
  • the term "intermediary" is used as a reference to the location of the element namely between the first casing element 17 and the second casing element 19.
  • the heat transferring elements 1 are arranged inside the intermediary casing element 18 which is shaped as a cylinder with open ends.
  • the inlet and outlet pipes 9, 10 leading the first fluid to and from the heat transferring elements 1 extend through the wall of the first casing element 17 as indicated in fig. 8.
  • the first casing element 17 further comprises an outlet 16 for the second fluid arranged in a first protrusion 20 of the first casing element 17.
  • a fixture 21 for connecting a motor 22 to the unit is placed on the first protrusion 20.
  • the motor 22 is used to drive the impellers 8 arranged inside the heat exchanger unit 13, which impellers 8 are arranged on a shaft 23 extending from the motor 22 through the wall of the protrusion 20 and typically into but not through the second casing element 19.
  • the second casing element 19 comprising an inlet 15 for the second fluid as indicated on fig. 8 and leads the second fluid to the heat transferring elements 1 arranged in the intermediary casing element 18.
  • the heat exchanger unit shown in fig. 8 is assembled by inserting the intermediary casing element 18 into the first and the second casing elements 17, 19 as indicated in fig. 9. Sealing between the intermediary casing element 18 and the first and the second casing element 17,19 respectively may be accomplished by arranging seals such as o-rings (not shown) in grooves (not shown) in surfaces abutting each other.
  • the casing 12 is a pressure carrying casing adapted to resist the pressure difference between the pressure of the fluids in the heat exchanger unit 13 and the ambience pressure, i.e. the pressure outside the heat exchanger unit 13.
  • fig. 9 shows a cross sectional view of a detail of a heat exchanger unit 13 according to the present invention.
  • the detail shown comprises a part of the intermediary casing element 18, the second casing element 19, and four stacked heat transferring elements 1 with impellers 8.
  • the second casing element 19 has a second protrusion 24 comprising a pressurisation stage 25 with three impellers 8 and a shaft 23 on which all impellers 8 are arranged.
  • the shaft 23 is rotated by a motor 22 arranged as indicated in fig. 8.
  • the pressurisation stage may preferably be used to pressurise the fluid more than what is need to overcome the loss due to the flow through the heat exchanging unit.
  • Fig. 10 shows a further embodiment where both fluids are pumped through the unit 13 by use of internally placed impellers 8; the figure shows the embodiment in an exploded view with the heat transferring elements 30 spaced apart and the casing except the end casings parts 12a, 12b removed to render the interior of the heat transfer unit visible.
  • the heat exchanger unit 13 comprises a number of heat transferring elements 30 formed as discs. Please note that in the present context the use of "disc” does not necessarily imply a circular structure; on the contrary and as indicated in fig. 10 discs may e.g. have an octagonally shaped perimeter.
  • the heat transferring elements 30 may be described as plate shaped.
  • the heat transferring elements are stacked so as to provide channels 31 between neighbouring elements 30 as shown in the figure.
  • the surfaces of the heat transferring elements 30 facing towards a channel constitute the fluid contact surfaces for the first and the second fluid respectively.
  • Connection stubs 32 leading fluid from one channel 31 to another channel 31 located upstream of a neighbouring channel are provided; as shown in the figure these may be arranged on some of the elements or be separate pieces to be fitted into a mating connection provided in the elements 30.
  • the connection stubs 32 connect to hole 32a in a neighbouring heat transferring element 30.
  • Each heat transferring element 30 abuts the casing at the rims 33.
  • the rims 33 are preferably sealed to the casing.
  • the flow paths of the two fluids are indicated fig. 10, wherein it is shown that the first fluid enters into the heat exchanger unit 13 from below (with reference to the orientation of fig. 10) through an inlet stub and flows through a connection stub 32 into a channel 31 being connected via a connection stub 32 to into an impeller 8.
  • the fluid flows in a swirling motion towards and through a connection stub 32 (it should be noted the flow may be straightened out when flowing through connection stubs 32) and enters into the next channel 31. In this next channel the fluid flows towards and through a next connection stub 32 which leads to an impeller.
  • This pattern may be repeated a number of times by stacking more heat transfer elements 30, before the first fluid flows out of the unit through an outlet stub.
  • the second fluid flows into the heat exchanger unit via an inlet stub from above and via a connection stub 32 to an impeller 8. After the impeller 8, the second fluid flows in a swirling motion into a channel 31 towards a connection stub leading fluid to a next channel 31. The fluid flows through the next channel 31 towards and through a connection stub 32 leading the fluid to an impeller 8.
  • the pattern may be repeated a number of times by stacking more heat transfer elements, before the second fluid flows out of the unit through an outlet stub.
  • a channel in which the first fluid flows is arranged between channels 31 through which the second fluid flow (or vice versa depending from which fluid the situation is seen) and as the fluids have different temperatures, heat exchange between the fluid through the heat transferring elements 30 occur.
  • the embodiment shown in fig. 10 is shown to have a octagonal cross section when viewed from above.
  • the cross section may be given other shapes such as squared or circular.
  • the outer casing 12 is preferably made as a tube with end casing parts in form of plates arranged at both ends of the tube as indicated in fig. 10 as 12a and 12b.
  • the end casing parts comprise connection stubs serving as inlets/outlet through which the first and the second fluids are fed into and flows out of the unit and may e.g. be shaped as indicated in fig. 8.
  • the end casing part also comprises penetrations though which shafts 23 on which the impellers are arranged extend. Suspension of the shafts 23 may be provided by a bearing 47 (see fig.
  • the heat exchanger unit is made up from a number of cassettes.
  • a cassette will typically comprise a number of heat transferring elements, and the cassettes are adapted to be combined, typically stacked, to form a heat exchanger unit.
  • One such example is shown in fig. 11.
  • one or more cassettes comprising heat transferring elements are combined with cassettes comprising other means for interacting with the fluid.
  • Fig. 11 shows schematically a heat exchanger unit according to the present invention.
  • the unit shown in fig. 11 is formed as an elongated unit having cylindrical outer casing 12 and comprising five cassettes 40, an inlet element 41 (similar to the second casing element 19 in fig. 8), an outlet element 42 (similar to the first casing element 17 in fig. 8) and a motor 22.
  • the motor 22 is arranged on a fixture 21.
  • the casing comprises the outer housings of cassettes 40, the inlet element 41 and the outlet element 42.
  • Within the cassettes 40 a number of heat transferring elements 1 and impellers 8 (see e.g.
  • the second fluid enters into the heat exchanger unit 13 through the inlet 15 (see fig. 11) provided in the inlet element 41, flows through the heat exchanger unit 13 and leaves the heat exchanger unit 13 through the outlet 16 (see fig. 11) provided in the outlet element 42.
  • One of the cassettes 40 comprise connections which are the ends of the pipes 9 10 and 10 shown in fig. 3.
  • Fig. 12 shows schematically a longitudinal cross section of a heat exchanger unit 13 according to the present invention, and shows in particular one way of assembling the unit shown in fig. 11.
  • the unit is formed as an elongated unit having a cylindrical casing and comprises six cassettes 40, an inlet element 41, an 15 outlet element 42 and a motor 22 arranged on a fixture 21 with a shaft 23 for rotating impellers (not shown) arranged in the heat exchanger unit 13.
  • Heat transferring elements 1 as well as impellers 8 are not shown in the figure.
  • the outer housings of the inflow element 41 and the outflow element 42 are considered as part of the casing 12.
  • the cassettes 40 and elements 41, 42 are assembled by a heat exchanger unit assembling fixture comprising a number of stay bolts 43 extending along the longitudinal direction of heat exchanger unit 13 and penetrating clamps 44. Nuts 45 are provided at the ends of the stay bolts 43 so that when the nuts 45 are tightened, the clamps 44 will provide a longitudinal
  • Securing of the elements 41, 42 and cassettes 40 in a direction perpendicular to the longitudinal direction of the heat exchanger unit 13 is shown as being provided by ring shaped guides 46 into which the elements 41, 42 and cassettes 30 40 fit snugly. Sealing of the heat exchanger unit is provided by applying o-rings e.g. in grooves provides in the ring shaped guides 46.
  • a structure of the heat exchanger unit comprising cassettes may also be applied to the heat exchanger unit shown in fig. 10.
  • the surface of the fluid contact surfaces of the heat transferring element may be manufactured to have a selected character.
  • the roughness of the fluid contact surfaces may be made smooth, rough and/or the surfaces may be corrugated.
  • the material of the heat transfer elements may be selected from materials having particular characteristics as to heat transferring coefficient and/or resistance against e.g. chemical exposure to avoid e.g. corrosion of the heat transferring elements.
  • the embodiments shown herein have so far focussed on exchanging heat between two fluids.
  • the invention may also be applied to exchanging heat between more than two fluids. This may be accomplished e.g. by arranging the heat transferring elements 1, 30 and connection stubs 5, 32 so as to lead fluids to channels where the neighbouring channels contains the fluids with which the fluid is to exchange heat with.
  • Such an example is shown in fig. 13.
  • Fig. 13 shows an embodiment where three fluids are pumped through the unit 13 by use of internally placed impellers 8; the figure shows the embodiment in an exploded view with the heat transferring elements 30 spaced apart and the casing except the end casings parts 12a, 12b removed to render the interior of the heat transfer unit visible.
  • the end casing parts 12a, 12b may e.g. be shaped as indicated in fig. 8.
  • the heat exchanger unit 13 comprising a number of heat transferring elements 30 formed as discs with rims 33 which are stacked so as to provide channels 31 between neighbouring elements 30 as shown in the figure.
  • the heat transferring elements 31 are at their rims 33 sealed to the casing.
  • the heat transfer unit comprising inlet and outlet stubs through which the fluid flows into and out of the unit 13.
  • the flow paths of the three fluids are indicated.
  • the unit comprising shafts 23 connected motors for rotating the impellers and these shafts are arranged in the unit by bearings and seals as described above e.g. in connection with fig. 10.
  • all three fluids are shown to proceed all the way through the heat exchanger unit, one of the fluid may be taken of unit before it reaches the an end casing part 12a or 12b.
  • the part of the heat transfer unit exchanging heat between two fluids only may be embodied similar to what is disclosed in connection with fig. 10.
  • Fig. 14 shows an exploded view of a further embodiment of a section of a heat exchanger unit according to the present invention. Components being the same as in the embodiment shown in fig. 10 are provided with the same reference numbers and detailed description thereof is omitted. Similar to the embodiment shown in fig. 10 casing parts including parts 12a and 12b have been left out in the figure to render the internal structure of the heat exchanger unit visible.
  • the heat exchanger unit comprises a number of heat transferring elements 30 formed as discs which are stacked so as to provide channels 31 between neighbouring elements 30 as shown in fig. 14.
  • the surfaces of the heat transferring elements facing towards a channel constitute the fluid contact surface for the first and the second fluid respectively.
  • impeller pairs (two impellers 8) are arranged in some of the channels 31. Although it is preferred to arrange the impellers of the impeller pairs symmetrically with their centres located along a radius as indicated in fig. 14, the impellers may be arranged differently.
  • the impellers of the impeller pairs are arranged on rotatable shafts 23. As indicated in fig. 14, shafts 23' drives impellers 8' and shafts 23 drives impellers 8.
  • the flow paths of the fluids through the heat exchanger unit are shown by the lines marked 1 st and 2 nd in fig. 14. As it can be realised from fig. 14, connections are provided, typically in the casing, leading fluid from one level to another level of the unit - such connections are labelled 50 in fig. 14.
  • each impeller in a pair of impellers Upon rotation of the shafts 23, each impeller in a pair of impellers generates a vortex which will interact with each other so that the vortexes generated by each impeller in an impeller pair superimpose each other resulting in a single vortex.
  • Such a vortex will be similar to the vortex generated by a single impeller arranged with its centre coinciding with the centre of a heat transferring element.
  • FIG. 10 and 14 show that the heat transferring elements 31 are plate shaped elements having channels for the first, the second and, fig. 13, the third fluid respectively forming part of the flow passages through the unit and extending from one side of the heat transferring element to the other side of the heat transferring element.
  • the channels are defined by the holes 32a, the connection stubs 32 and, if present, the impellers 8.

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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)

Abstract

La présente invention concerne une unité d'échangeur de chaleur (13) destinée à échanger de la chaleur entre un premier et un second fluide. L'unité (13) comprend un passage d'écoulement pour le premier fluide et un passage d'écoulement pour le second fluide, les passages d'écoulement étant reliés à des entrées (9) et à des sorties (10) de l'unité d'échangeur de chaleur (13) à travers lesquelles le premier et le second fluide s'écoulent dans et hors de l'unité d'échangeur de chaleur (13). Ladite unité (13) comprend en outre un ou plusieurs éléments de transfert de chaleur (1) ayant une première surface de contact de fluide et une seconde surface de contact de fluide, à travers lesquelles de la chaleur est conduite du premier fluide au second fluide ou réciproquement, les surfaces de contact formant au moins une partie des passages d'écoulement. L'unité (13) comprend en outre un ou plusieurs moyens d'augmentation de pression totale (8) destinés à augmenter la pression totale d'au moins l'un des fluides au moins localement dans l'unité d'échangeur de chaleur (13), et un boîtier (12) encapsulant le ou les éléments de transfert de chaleur (1) et un, plusieurs ou la totalité des moyens d'augmentation de pression totale (8).
EP08784462A 2007-08-17 2008-08-15 Échangeur de chaleur Withdrawn EP2185883A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200701180 2007-08-17
PCT/DK2008/050204 WO2009024153A1 (fr) 2007-08-17 2008-08-15 Échangeur de chaleur

Publications (1)

Publication Number Publication Date
EP2185883A1 true EP2185883A1 (fr) 2010-05-19

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ID=40091555

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Application Number Title Priority Date Filing Date
EP08784462A Withdrawn EP2185883A1 (fr) 2007-08-17 2008-08-15 Échangeur de chaleur

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Country Link
US (1) US20110146952A1 (fr)
EP (1) EP2185883A1 (fr)
CN (1) CN101802538B (fr)
WO (1) WO2009024153A1 (fr)

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Also Published As

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CN101802538A (zh) 2010-08-11
US20110146952A1 (en) 2011-06-23
WO2009024153A1 (fr) 2009-02-26
CN101802538B (zh) 2012-08-22

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