WO2000017592A2 - Radiators including tubes with optimal hydro-dynamic cross section - Google Patents

Radiators including tubes with optimal hydro-dynamic cross section Download PDF

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Publication number
WO2000017592A2
WO2000017592A2 PCT/RO1999/000007 RO9900007W WO0017592A2 WO 2000017592 A2 WO2000017592 A2 WO 2000017592A2 RO 9900007 W RO9900007 W RO 9900007W WO 0017592 A2 WO0017592 A2 WO 0017592A2
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WO
WIPO (PCT)
Prior art keywords
tubes
type
optimal
dynamic cross
heat exchanger
Prior art date
Application number
PCT/RO1999/000007
Other languages
French (fr)
Other versions
WO2000017592A3 (en
Inventor
Panait Niculescu
Gheorghe Sora
Nicolae V EŞTEMEAN
Matilda Mihalcea
Original Assignee
S.C. Romradiatoare S.A.
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 S.C. Romradiatoare S.A. filed Critical S.C. Romradiatoare S.A.
Publication of WO2000017592A2 publication Critical patent/WO2000017592A2/en
Publication of WO2000017592A3 publication Critical patent/WO2000017592A3/en

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Classifications

    • 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
    • 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
    • F28D1/04—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 tubular conduits
    • F28D1/053—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 tubular conduits the conduits being straight
    • F28D1/0535—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 tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • 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
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0035—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for domestic or space heating, e.g. heating radiators

Definitions

  • the invention concerns the optimal cross section (water drop) tube for heat exchangers based on a working fluid consisting of a mixture of water - antifreeze solution and air.
  • the elements that grant high efficiency to such heat exchangers are the tubes and the fins. -
  • the novelty of this heat exchanger consists in the shape of the tube and of the turbulence promoter (baffle).
  • a turbulence promoter ( baffle) is introduced inside the tube of simple circuit heat exchangers. With S circuit heat exchangers the tube shall not be provided with a turbulence promoter.
  • Such heat exchangers use flat fins and the connection between the tube and the fin shall be achieved by tube expansion.
  • Tubes may be manufactured of aluminum, copper or brass. Turbulence promoters should be manufactured of aluminum, copper or brass, depending on the material the tube is made of.
  • Base plates are to be manufactured of aluminum or brass, depending on the material the tubes are made of.
  • basins and flanks depend on the type of the heat exchanger (classical - copper: brass; modernized - aluminum).
  • the novelty consists in the shape of the tube - "water drop” shape, with a minimal hydro-dynamic resistance to the gravitational flow.
  • This shape allows a maximal air speed around the tube together with a minimal pressure drop.
  • pictures 1 and 2 present the radiating element.
  • the other components, the basins, the flanks and the connection elements, as well as the assembling technique, shall not be pictured, as they do not represent any novelty.
  • Pictures 2 and 3 present the base plates. Mention should be made of the fact that position of the tubes and the distance between them vary depending on the type of heat exchanger, so as to be fit for any type of vehicle.
  • the tube which is the key element of this invention, is presented in picture 5.
  • the angle and the overall dimensions of the tubes may change according to various requirements, as long as the water-drop shape is preserved.
  • the angle may range from 35° to 60°, depending on the desired thermal flow.
  • ROMRADIATOARE type cross section tubes may be achieved by the deformation of a round cross section tube.
  • Picture 6 presents the turbulence promoter (baffle) for the liquid side.
  • the overall dimensions may vary depending on the size of the tube.
  • Ci - are parameters depending on the physical characteristics of the incident fluid.
  • the calculus is based upon the fact that the technical convection coefficient widely depends on the incidence angle of a fluid flow on the surface of a solid.
  • the density value of the thermal flow on a given surface depends on the points of contact between the fluid and the surface. This is obviously true when the geometrical parameters (the shape of the surface), the fluid flow direction, the dynamic parameters (the incident fluid synthesis) and the thermal parameters remain constant in time.

Abstract

The invention concerns a heat exchanger designed to be used in the cooling or heating system of internal combustion engines on motor vehicles. The heat exchanger described in this invention is characterized by a system, whose tube and turbulence promoter consist of optimal cross section elements designed to achieve a maximal thermal flow, a minimal air pressure drop and a reduced material consumption. The overall dimensions of the tubes and their positioning may be adapted to the vehicle the heat exchanger is destined for, so as to meet all requirements of the customers. The heat exchanger has a compact structure - in some cases it consists of only one row of tubes - and it provides a maximal efficiency thermal exchange.

Description

HEAT EXCHANGERS INCLUDING OPTIMAL HYDRO-DYNAMIC CROSS SECTION OMRADIATOARE -TYPE TUBES
The invention concerns the optimal cross section (water drop) tube for heat exchangers based on a working fluid consisting of a mixture of water - antifreeze solution and air.
The elements that grant high efficiency to such heat exchangers are the tubes and the fins. -
The novelty of this heat exchanger consists in the shape of the tube and of the turbulence promoter (baffle).
By using this tube the efficiency of heat exchangers is considerably improved and the number of fins is diminished, thus resulting in a minimal material consumption.
A turbulence promoter ( baffle) is introduced inside the tube of simple circuit heat exchangers. With S circuit heat exchangers the tube shall not be provided with a turbulence promoter.
Such heat exchangers use flat fins and the connection between the tube and the fin shall be achieved by tube expansion.
Tubes may be manufactured of aluminum, copper or brass. Turbulence promoters should be manufactured of aluminum, copper or brass, depending on the material the tube is made of.
Base plates are to be manufactured of aluminum or brass, depending on the material the tubes are made of.
The material and the shape of basins and flanks depend on the type of the heat exchanger (classical - copper: brass; modernized - aluminum).
We shall not insist upon the assembling process of these components, as this aspect does not represent a novelty in the construction of either classical or modern heat exchangers.
The novelty consists in the shape of the tube - "water drop" shape, with a minimal hydro-dynamic resistance to the gravitational flow.
This shape allows a maximal air speed around the tube together with a minimal pressure drop.
The combination of these two effects results in an improved convective heat exchange between the two fluids, as well as in a reduced pressure loss of the cooling agent, which in this particular case is air.
With a view to these aspects, pictures 1 and 2 present the radiating element. The other components, the basins, the flanks and the connection elements, as well as the assembling technique, shall not be pictured, as they do not represent any novelty.
Pictures 2 and 3 present the base plates. Mention should be made of the fact that position of the tubes and the distance between them vary depending on the type of heat exchanger, so as to be fit for any type of vehicle.
The tube, which is the key element of this invention, is presented in picture 5. The angle and the overall dimensions of the tubes may change according to various requirements, as long as the water-drop shape is preserved. The angle may range from 35° to 60°, depending on the desired thermal flow.
ROMRADIATOARE type cross section tubes may be achieved by the deformation of a round cross section tube.
Picture 6 presents the turbulence promoter (baffle) for the liquid side. The overall dimensions may vary depending on the size of the tube.
In calculating the thermal flow of heat exchangers provided with ROMRADIATOARE type tubes, the following judgement was taken into account:
The incidental external flow shall hit directly the B'AB circular area, following after that BCD and B'C'D areas under an incidence angle of φ = 0. -
Using the result of the circular cross section, we may calculate the thermal flow expression, exchanged on a surface of hc length (picture 7).
φ = 2r C td | 3,7865 + 1.548J β
Figure imgf000004_0001
The expression of the temperature variation law on a tube with a ROMRADIATOARE type section, with a length of hc, is:
Figure imgf000004_0002
The following notations were used: φ - thermal flow
C, - thermo-dynamic constant
C - specific heat - fluid flow rate w - fluid speed he - wall length
C|. Ci - are parameters depending on the physical characteristics of the incident fluid.
The calculus is based upon the fact that the technical convection coefficient widely depends on the incidence angle of a fluid flow on the surface of a solid.
According to the above considerations, the density value of the thermal flow on a given surface depends on the points of contact between the fluid and the surface. This is obviously true when the geometrical parameters (the shape of the surface), the fluid flow direction, the dynamic parameters (the incident fluid synthesis) and the thermal parameters remain constant in time.

Claims

1. Cooling /heating structure, characterized by the fact that it consists of ROMRADIATOARE type optimal hydro-dynamic cross section tubes, flat cooling heating fins, adequate turbulence promoters and base plates.
2. ROMRADIATOARE type optimal hydro-dynamic cross section tubes, as defined in Claim 1, characterized by the fact that their "water drop" shape allows a maximal thermal exchange between the two working fluids and a minimal air pressure drop.
3. Turbulence promoter, as defined in Claim 1. characterized by the fact that its shape allows a turbulence of the internal fluid, resulting in a maximal thermal transfer between the two working fluids.
4. Base plates, as defined in Claim 1. which due to the water drop shape and to the variable position and size of the recesses, placed on one or several rows, allow the assembling of the optimal hydro-dynamic cross section tubes and their use on virtually any type of motor vehicle.
5. Cooling or heating flat fins, which due to the water-drop-shaped recesses allow the mounting of the ROMRADIATOARE type tubes at different distances in view of obtaining an optimal thermal flow, depending on customer requirements. The recesses inside the fins shall fit the positioning on the base plates.
PCT/RO1999/000007 1998-05-14 1999-04-13 Radiators including tubes with optimal hydro-dynamic cross section WO2000017592A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RO98-00968A RO115989B1 (en) 1998-05-14 1998-05-14 Heat exchanger
RO98-00968 1998-05-14

Publications (2)

Publication Number Publication Date
WO2000017592A2 true WO2000017592A2 (en) 2000-03-30
WO2000017592A3 WO2000017592A3 (en) 2000-08-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/RO1999/000007 WO2000017592A2 (en) 1998-05-14 1999-04-13 Radiators including tubes with optimal hydro-dynamic cross section

Country Status (2)

Country Link
RO (1) RO115989B1 (en)
WO (1) WO2000017592A2 (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE325832C (en) * 1918-07-25 1920-09-21 Norddeutsche Kuehlerfabrik G M Vehicle or aircraft radiator
DE475903C (en) * 1927-02-19 1929-05-03 Martin Heine Cooler with interchangeable elements for internal combustion engines
GB468980A (en) * 1936-03-16 1937-07-16 Harold Livsey Improvements in or connected with tubular feed water heaters and like heat exchangers
DE882903C (en) * 1950-10-08 1953-08-03 Gerhard Dipl-Ing Goebel Air heater
GB1422611A (en) * 1972-03-01 1976-01-28 Lund B G A Tubular heat exchangers
FR2292207A1 (en) * 1974-11-21 1976-06-18 Bitter Harald Central heating wall radiator with low chimney effect - has triangular section vert tubes with staggered corrugated faces
DE3327335A1 (en) * 1983-07-29 1985-02-14 Thermal-Werke, Wärme-, Kälte-, Klimatechnik GmbH, 6909 Walldorf Heat exchanger and method for producing it
EP0303096A1 (en) * 1987-08-04 1989-02-15 KOMOTZKI, Michael Surface cooler as an air cooler
GB2271418A (en) * 1992-10-09 1994-04-13 Mtu Muenchen Gmbh Alternate rows of drop-shaped heat exchange tubes arranged to face in opposite directions

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE325832C (en) * 1918-07-25 1920-09-21 Norddeutsche Kuehlerfabrik G M Vehicle or aircraft radiator
DE475903C (en) * 1927-02-19 1929-05-03 Martin Heine Cooler with interchangeable elements for internal combustion engines
GB468980A (en) * 1936-03-16 1937-07-16 Harold Livsey Improvements in or connected with tubular feed water heaters and like heat exchangers
DE882903C (en) * 1950-10-08 1953-08-03 Gerhard Dipl-Ing Goebel Air heater
GB1422611A (en) * 1972-03-01 1976-01-28 Lund B G A Tubular heat exchangers
FR2292207A1 (en) * 1974-11-21 1976-06-18 Bitter Harald Central heating wall radiator with low chimney effect - has triangular section vert tubes with staggered corrugated faces
DE3327335A1 (en) * 1983-07-29 1985-02-14 Thermal-Werke, Wärme-, Kälte-, Klimatechnik GmbH, 6909 Walldorf Heat exchanger and method for producing it
EP0303096A1 (en) * 1987-08-04 1989-02-15 KOMOTZKI, Michael Surface cooler as an air cooler
GB2271418A (en) * 1992-10-09 1994-04-13 Mtu Muenchen Gmbh Alternate rows of drop-shaped heat exchange tubes arranged to face in opposite directions

Also Published As

Publication number Publication date
RO115989B1 (en) 2000-08-30
WO2000017592A3 (en) 2000-08-03

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