EP3532790A1 - Echangeur thermique - Google Patents
Echangeur thermiqueInfo
- Publication number
- EP3532790A1 EP3532790A1 EP17797685.9A EP17797685A EP3532790A1 EP 3532790 A1 EP3532790 A1 EP 3532790A1 EP 17797685 A EP17797685 A EP 17797685A EP 3532790 A1 EP3532790 A1 EP 3532790A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- channels
- exchanger
- exchanger according
- distance
- bundle
- 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.)
- Ceased
Links
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
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/02—Tubular elements of cross-section which is non-circular
- F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
-
- 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
- F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
- F28D2021/0073—Gas coolers
-
- 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
- F28D2021/008—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for vehicles
Definitions
- the invention relates to a heat exchanger.
- the invention aims in particular to improve this type of heat exchanger.
- the subject of the invention is thus a heat exchanger comprising: a bundle of heat exchange channels in which a cooling fluid circulates, the channel bundle being made of a material with an anisotropy in particular greater than 0.6 and preferably much lower; at 1, the channels being in particular made by extrusion and soldered, each of the channels having an elongated cross section.
- the channel section is different from a circular shape.
- the anisotropy greater than 0.6 and the elongated shape of the channels make it possible to obtain channels with a burst pressure that is high, which makes it possible to have a heat exchanger of great mechanical strength. This is particularly advantageous when circulating in the channels a high pressure coolant.
- the bursting pressure depends more on the crystallography of the material in which the channel bundle, represented by the anisotropy, is produced than on the tensile force.
- the anisotropy of the mechanical strength of the beam is related to a heterogeneity of the crystallographic structure revealed by a metallographic examination.
- the anisotropy index of the material is defined by measuring the mechanical strength in the 3 axes and defining the index by the ratio between the lowest value and the largest value. It should be noted that this is not a local microscopic measurement but a measurement on a beam profile after soldering.
- This anisotropy is, among other things, the consequence of the heterogeneous distribution of the grain size which can be revealed on a finished exchanger by means of a metallographic section and an acid attack.
- two immediately adjacent channels being separated by a distance WT and these two immediately adjacent channels having a median width DC measured parallel to the distance WT, the distance WT and the diameter DC being connected by the following relation:
- BP represents a burst pressure of the predetermined beam
- SM represents a dispersion value, in particular substantially equal to 0.15, in particular for holding material in which the channel bundle is made and potential variations in the geometry of the channel bundle
- the channel bundle has sufficient mechanical strength to ensure safe operation of the loop. Specifically, a relationship between the WT / DC ratio, namely geometric parameters, and the burst pressure has been updated. This makes it possible to size channel beams of great resistance.
- the BP value may be the high pressure or low pressure burst pressure value depending on the integration of the exchanger in a high pressure or low pressure line of the air conditioning system.
- the burst pressure is chosen to be greater than 300 bars.
- the exchanger is arranged to be disposed on a high pressure line, for example an air conditioning system of a motor vehicle, the burst pressure is chosen substantially equal to 380 bars.
- the exchanger is arranged to be disposed on a low pressure line, for example an air conditioning system of a motor vehicle, the bursting pressure is preferably chosen substantially equal to 320 Bars.
- the ratio WT / DC is in particular between 1 .3 and 1 .78.
- the exchanger is arranged to be disposed on a high pressure line, for example an air conditioning system of a motor vehicle, the ratio WT / DC then being preferably between 1 .3 and 1. 57.
- the exchanger is arranged to be disposed on a low pressure line for example of a motor vehicle air conditioning system, the ratio WT / DC being between 1 .54 and 1 .78.
- the channel bundle is made of a material with a particular anisotropy greater than 0.7, especially greater than 0.8. Anisotropy is the result of the process of manufacturing the tube and brazing the beam.
- it is material of the series type 3000, 9000 or 1000, having mechanical characteristics measured on tube included for the RP 0.2% (traction giving a residual deformation of 0.2%) between 15 and 50 MPa, RM ( tensile strength) between 70 and 100 MPa and A50% (elongation at break) between 14 and 35.
- the distance WT is between 0.4 mm and 3 mm.
- the material is preferably such that its anisotropy increases after the brazing operation.
- the channels have a substantially oval cross section.
- the channel bundle comprises a body having a flat face and the distance RT between the top of one of the channels and this flat face is smaller than half the distance WT between two immediately adjacent channels. .
- the cooling fluid is a refrigerant in the supercritical state, such as CO 2 in particular.
- the channels of the beam extend parallel to each other.
- the exchanger forms one of the following devices: an evaporator, a gas cooler, an electric battery cooler, a water chiller (chiller), a gas cooler.
- the exchanger is an evaporator or a condenser for a vehicle air conditioning system, or any other heat exchange device.
- the invention further relates, independently or in combination with the foregoing, to a heat exchanger comprising:
- a bundle of heat exchange channels in which a cooling fluid circulates the channels being in particular made by extrusion and brazed, the channels being each arranged, at least partially, parallel to each other and each having a center, these passing centers; by an axis (X),
- these channels having a cross section, in particular of elongated shape, with a smaller dimension (a) along the axis passing through the centers and a larger dimension (b) in a direction perpendicular to this axis,
- the channel bundle comprising a body having a flat face, and the top of one of the channels being separated from this flat face by a distance (RT), exchanger in which the ratio b / a is in the range [1, 05 ; 1, 4] and / or the ratio WT / RT is in the range [1, 1; 1, 9] in order to maximize the value Pw.Pmax.Sfluid / Salu where
- Pmax is the maximum pressure
- Sfluid is the fluid section
- Salu is the aluminum section
- the invention thus makes it possible to improve the mechanical and thermal performances by using a minimum of aluminum.
- the mechanical strength of a wall between the channels is lower than that of a wall between one of the channels and the flat face, in particular because of the resulting anisotropy of the extrusion and brazage of the beam.
- FIG. 1 diagrammatically and partially illustrates an evaporator according to an exemplary embodiment of the invention
- FIGS. 2 and 4 illustrate, schematically and partially, in section, a bundle of channels of the evaporator of FIG. 1,
- FIG. 3 is a graph which schematically illustrates the correlation between the ratio WT / DC and the burst pressure
- FIG. 5 illustrates the evolution of the value Pw.Pmax.Sfluid / Salu as a function of WT / RT and b / a.
- FIG. 1 shows a heat exchanger 1 according to the invention. This heat exchanger can be used in particular as an evaporator of an air conditioning circuit of a motor vehicle, in which a first fluid circulates, such as a coolant in the supercritical state, such as CO2 in particular.
- a first fluid circulates, such as a coolant in the supercritical state, such as CO2 in particular.
- the heat exchanger 1 is for example intended to condition a second fluid, such as the flow of air to the passenger compartment of the motor vehicle, by heat exchange with the refrigerant circulating in the heat exchanger.
- the heat exchanger 1 is for example placed inside an air conditioning unit 100 generally located in the passenger compartment of the vehicle.
- the refrigerant evaporating within the heat exchanger 1 working in evaporator captures caloric energy from the air flow to the passenger compartment, to allow the passage of refrigerant from a liquid phase to a gas phase.
- the heat exchanger 1 consists of two manifolds 2 arranged vis-à-vis. Between the manifolds 2 is disposed a bundle of heat exchange elements 4 for containing the coolant, and arranged parallel to each other.
- the heat exchange elements 4 have a generally tubular shape. Between the heat exchange elements 4, there are heat exchange pads 6 whose function is to increase the heat exchange surface, in a manner known per se.
- FIG. 2 is a sectional view along the plane P of Figure 1, a heat exchange element 4 comprising channels 5 parallel to each other.
- the channel bundle 4 is made of a material with an anisotropy especially greater than 0.6, the channels being made by extrusion and brazed, each of the channels 5 having an elongated cross section.
- Two immediately adjacent 5 channels are separated by a distance WT and these two immediately adjacent channels having a median width DC measured parallel to the distance WT, the distance WT and the diameter DC being connected by the following relation:
- SM represents a dispersion value, in particular substantially equal to 0.15, in particular for holding material in which the beam of channels and potential variations of the geometry of the channel bundle is produced.
- DC is the median value between RL and RR, namely respectively the distance, measured along the X axis passing through the centers O of the two channels 5, between each center O of one of the two channels 5 and its edge 9 on the side of the adjacent channel 5.
- the burst pressure is chosen substantially equal to 380 bars and the ratio WT / DC is chosen between 1 .3 and 1. 57.
- the burst pressure is chosen to be substantially equal to 320 bars and the ratio WT / DC is chosen between 1, 54 and 1.78 .
- the channel bundle is made of a material with a particular anisotropy greater than 0.7, especially greater than 0.8.
- the material is chosen so that its anisotropy increases after the soldering operation.
- it is material of the series type 3000, 9000 or
- the channels 5 have a substantially oval cross section.
- the channel bundle 5 comprises a body having a flat face 8 and the distance RT between the top of one of the channels and this flat face is smaller than half the distance WT between two immediately adjacent channels.
- the ratio b / a is in the range [1, 05; 1, 4] and / or the ratio WT / RT is in the range [1, 1; 1, 9] in order to maximize the value Pw.Pmax.Sfluid / Salu
- Pmax is the maximum pressure
- Salu is the aluminum section.
- the dimensions a and b are in particular illustrated in FIG. 4.
- the mechanical strength of a wall between the channels is smaller than that of a wall between one of the channels and the flat face.
- the ratio b / a is in the range [1, 05; 1, 4] and the ratio WT / RT is in the range [1, 1; 1, 9] to optimize value Pw.Pmax.Sfluid / Salu.
- the bursting pressure BP for an evaporation device such as an evaporator is in particular between 300 and 340 bar at room temperature (25 degrees Celsius), preferably is substantially equal to 320 bars.
- BP burst pressure for a gas cooling device is in particular between 350 and 400 bars at room temperature (25 degrees Celsius), preferably is substantially equal to 390 bars at 25 °.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Geometry (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1660431A FR3058210A1 (fr) | 2016-10-27 | 2016-10-27 | Echangeur thermique |
| PCT/FR2017/052898 WO2018078254A1 (fr) | 2016-10-27 | 2017-10-20 | Echangeur thermique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3532790A1 true EP3532790A1 (fr) | 2019-09-04 |
Family
ID=58314351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP17797685.9A Ceased EP3532790A1 (fr) | 2016-10-27 | 2017-10-20 | Echangeur thermique |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3532790A1 (fr) |
| FR (1) | FR3058210A1 (fr) |
| WO (1) | WO2018078254A1 (fr) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3313086B2 (ja) * | 1999-06-11 | 2002-08-12 | 昭和電工株式会社 | 熱交換器用チューブ |
| JP2001165532A (ja) | 1999-12-09 | 2001-06-22 | Denso Corp | 冷媒凝縮器 |
| US6536255B2 (en) * | 2000-12-07 | 2003-03-25 | Brazeway, Inc. | Multivoid heat exchanger tubing with ultra small voids and method for making the tubing |
| AU2003272090B2 (en) | 2002-10-02 | 2008-08-07 | Showa Denko K.K. | Heat exchanging tube and heat exchanger |
| JP3821113B2 (ja) * | 2003-05-23 | 2006-09-13 | 株式会社デンソー | 熱交換用チューブ |
-
2016
- 2016-10-27 FR FR1660431A patent/FR3058210A1/fr not_active Withdrawn
-
2017
- 2017-10-20 WO PCT/FR2017/052898 patent/WO2018078254A1/fr not_active Ceased
- 2017-10-20 EP EP17797685.9A patent/EP3532790A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| FR3058210A1 (fr) | 2018-05-04 |
| WO2018078254A1 (fr) | 2018-05-03 |
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