FR2620805A1 - Tube for condensation of refrigeration fluids - Google Patents
Tube for condensation of refrigeration fluids Download PDFInfo
- Publication number
- FR2620805A1 FR2620805A1 FR8713036A FR8713036A FR2620805A1 FR 2620805 A1 FR2620805 A1 FR 2620805A1 FR 8713036 A FR8713036 A FR 8713036A FR 8713036 A FR8713036 A FR 8713036A FR 2620805 A1 FR2620805 A1 FR 2620805A1
- Authority
- FR
- France
- Prior art keywords
- tube
- ribs
- wall
- parts
- tube 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.)
- Granted
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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
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
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- 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
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- 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)
Abstract
Description
La présente invention concerne un nouveau tube pour la condensation de fluides frigorigènes divers. The present invention relates to a new tube for the condensation of various refrigerants.
Dans la technique, les tubes de condensation sont souvent réalisés par filage d'un métal bon conducteur de la chaleur, notamment l'aluminium. In the art, the condensation tubes are often produced by spinning a metal which is a good conductor of heat, in particular aluminum.
Pour améliorer l'échange thermique, les parois des tubes sont aussi peu épaisses que possible mais sont souvent renforcées par des cloisons transversales permettant ainsi aux parois du tube de supporter des pressions relativement élevées. To improve heat exchange, the walls of the tubes are as thin as possible but are often reinforced by transverse partitions allowing the walls of the tube to withstand relatively high pressures.
I1 a été constaté de façon surprenante qu'au moment du changement d'état du fluide frigorigène, il se forme un film liquide sur certaines parties de la paroi interne du tube, ce film n'étant pas d'épaisseur régulière. On sait, par ailleurs, que la résistance thermique du film liquide formé est pratiquement proportionnelle A son épaisseur. I1 was surprisingly found that at the time of the change of state of the refrigerant, a liquid film is formed on certain parts of the internal wall of the tube, this film not being of regular thickness. It is also known that the thermal resistance of the liquid film formed is practically proportional to its thickness.
Le tube de condensation selon la présente invention permet de remédier h ces inconvénients et présente 2 cet effet, dans certaines parties au moins de sa paroi interne, des nervures longitudinales de forme convexe séparées par des parties sensiblement planes. The condensing tube according to the present invention overcomes these drawbacks and has this effect, in at least some parts of its internal wall, longitudinal ribs of convex shape separated by substantially planar parts.
Grâce a' l'invention, l'épaisseur de film liquide en contact avec la paroi du tube est diminuée et ainsi réduit la résistance thermique due au film liquide. Thanks to the invention, the thickness of liquid film in contact with the wall of the tube is reduced and thus reduces the thermal resistance due to the liquid film.
Selon une autre caractéristique de l'invention, les nervures présentent une paroi de forme parabolique. According to another characteristic of the invention, the ribs have a wall of parabolic shape.
Selon une autre caractéristique, la paroi des nervures est reliée aux parties sensiblement planes par des courbures concaves. According to another characteristic, the wall of the ribs is connected to the substantially planar parts by concave curvatures.
Selon une autre caractéristique, les courbures concaves sont des segments de parabole. According to another characteristic, the concave curvatures are segments of a parabola.
Ainsi, le film liquide se formant dans la partie plane, partie où l'échange thermique se réalise au mieux, a tendance a glisser le long des parties concaves puis convexes et à venir se rassembler sur le sommet de la nervure et c libérer ainsi les parties planes d'un film liquide. Thus, the liquid film forming in the flat part, the part where the heat exchange takes place at best, tends to slide along the concave then convex parts and to come together on the top of the rib and thus release the flat parts of a liquid film.
Diverses autres caractéristiques de l'invention ressortent d'ailleurs de la description détaillée qui suit. Various other characteristics of the invention will also emerge from the detailed description which follows.
Une forme de réalisation de l'objet de l'invention est représentée, . titre d'exemple non limitatif, au dessin annexé. An embodiment of the object of the invention is shown,. by way of nonlimiting example, in the accompanying drawing.
La fig. 1 est une coupe d'un tube pour la condensation de fluide frigorigène faisant application de l'invention. Fig. 1 is a section through a tube for the condensation of refrigerant applying the invention.
La fig. 2 est une coupe très agrandie illustrant une caractéristique particulière. Fig. 2 is a very enlarged section illustrating a particular characteristic.
La fig. 1 montre un tube, désign dans son ensemble par 1, qui est réalisé, par exemple par filage, en aluminium ou autre métal bon conducteur de la chaleur. Fig. 1 shows a tube, generally designated by 1, which is made, for example by spinning, of aluminum or other metal that is a good conductor of heat.
Le tube 1 représenté délimite deux grands côtés sensiblement plans reliés entre eux par deux petits côtés arrondis. Le tube 1 est destiné > servir F la condensation d'un fluide frigorigène, c'est-a-dire . permettre la dissipation des calories correspondant au moins à la chaleur latente de condensation du fluide considérée pour son passage de la phase vapeur à la phase liquide. The tube 1 shown delimits two large substantially planar sides connected together by two small rounded sides. The tube 1 is intended> to serve F the condensation of a refrigerant, that is to say. allow the dissipation of calories corresponding at least to the latent heat of condensation of the fluid considered for its passage from the vapor phase to the liquid phase.
Le tube représenté comporte plusieurs compartiments 2, 2a ... 2n, séparés par des cloisons 3, afin d'augmenter la surface de contact du fluide avec la matière du tube. The tube shown has several compartments 2, 2a ... 2n, separated by partitions 3, in order to increase the contact surface of the fluid with the material of the tube.
Selon l'invention, on forme, dans la paroi interne du tube, des nervures longitudinales 4. Les nervures longitudinales sont réalisées de préférence de façon que leur paroi 5 soit convexe. According to the invention, longitudinal ribs 4 are formed in the internal wall of the tube. The longitudinal ribs are preferably made so that their wall 5 is convex.
De préférence, les nervures 4 ont une forme parabolique de sorte que le rayon de courbure R de la paroi 5 va croissant . partir de leur sommet. Cette forme a pour effet d'améliorer l'efficacité de l'échange thermique car les nervures 4 augmentent la surface interne du tube et, de plus, lorsque le rayon de courbure
R va croissant, il a été constaté de façon surprenante que, par le jeu des forces de tension superficielle et du fait de la viscosité du fluide condensé, l'épaisseur du film de fluide condensé est sensiblement diminuée sur les parties sensiblement planes tout en s'uniformisant tout au long de la paroi de la nervure au lieu que l'épaisseur du film de fluide condensé tende S croitre dans le fond des cavités.Preferably, the ribs 4 have a parabolic shape so that the radius of curvature R of the wall 5 increases. from their top. This shape has the effect of improving the efficiency of the heat exchange because the ribs 4 increase the internal surface of the tube and, moreover, when the radius of curvature
R is increasing, it has been surprisingly found that, by the play of surface tension forces and due to the viscosity of the condensed fluid, the thickness of the film of condensed fluid is substantially reduced on the substantially flat parts while s 'standardizing all along the wall of the rib instead that the thickness of the film of condensed fluid tends to grow in the bottom of the cavities.
Suivant un mode de réalisation préféré illustré par la fig. 2, non seulement le rayon de courbure R de la paroi 5 des nervures croit mais encore la courbure est raccordée aux parties planes 6 de la paroi interne des tubes par une courbure opposée 7, cette courbures étant prévue pour que le fluide puisse s'écouler de manière uniforme sans qu'il y ait rupture et de manière que ledit film soit aussi mince que possible. Ainsi, la courbure convexe de chaque nervure peut être reliée aux parties planes 6 par une courbure concave, par exemple parabolique ou circulaire. According to a preferred embodiment illustrated in FIG. 2, not only the radius of curvature R of the wall 5 of the ribs increases, but also the curvature is connected to the flat parts 6 of the internal wall of the tubes by an opposite curvature 7, this curvature being provided so that the fluid can flow uniformly without breaking and so that said film is as thin as possible. Thus, the convex curvature of each rib can be connected to the flat parts 6 by a concave curvature, for example parabolic or circular.
Les nervures 4 sont représentées au dessin seulement dans les parties rectilignes du tubes. On ne sortirait pas du cadre de l'invention en prévoyant également des nervures dans les parties courbes et, le cas échéant, dans les cloisons 3. The ribs 4 are shown in the drawing only in the straight parts of the tubes. It would not be departing from the scope of the invention to also provide ribs in the curved parts and, where appropriate, in the partitions 3.
L'invention n'est pas limitée a' l'exemple de réalisation, représenté et décrit en détail, car diverses modifications peuvent y être apportées sans sortir de son cadre. En particulier, on ne sortirait pas du cadre de l'invention en la mettant en oeuvre dans des tubes présentant en section d'autres formes que celles représentées. Le tube pourrait en effet présenter des petits côtés rectilignes ou encore les grands côtés pourraient être arqués pour réaliser un tube oval. Lorsque le tube ne comporte pas de cloison 3, sa forme initiale pourrait être différente de sa forme finale. I1 pourrait par exemple présenter initialement sensiblement la forme du chiffre 8 et, après gonflage, une forme approximativement ovale. Le tube pourrait aussi présenter une section circulaire, les nervures étant également formées a' partir de la paroi interne. The invention is not limited to the embodiment, shown and described in detail, because various modifications can be made without departing from its scope. In particular, it would not be departing from the scope of the invention to use it in tubes having in section other shapes than those shown. The tube could indeed have short rectilinear sides or the long sides could be arched to make an oval tube. When the tube does not have a partition 3, its initial shape could be different from its final shape. I1 could for example initially have substantially the shape of the number 8 and, after inflation, an approximately oval shape. The tube could also have a circular section, the ribs also being formed from the inner wall.
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8713036A FR2620805B1 (en) | 1987-09-21 | 1987-09-21 | TUBE FOR THE CONDENSATION OF REFRIGERANT FLUIDS |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8713036A FR2620805B1 (en) | 1987-09-21 | 1987-09-21 | TUBE FOR THE CONDENSATION OF REFRIGERANT FLUIDS |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2620805A1 true FR2620805A1 (en) | 1989-03-24 |
FR2620805B1 FR2620805B1 (en) | 1990-06-15 |
Family
ID=9355086
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8713036A Expired - Fee Related FR2620805B1 (en) | 1987-09-21 | 1987-09-21 | TUBE FOR THE CONDENSATION OF REFRIGERANT FLUIDS |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2620805B1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1413543A (en) * | 1964-11-05 | 1965-10-08 | Maschf Augsburg Nuernberg Ag | Tube with longitudinal ribs on the inside, in particular cooling tube for saturated steam during condensation |
FR1475915A (en) * | 1966-02-24 | 1967-04-07 | Coutisson Sa Atel | Improvements to tubes for heat exchangers |
FR2410238A1 (en) * | 1977-11-25 | 1979-06-22 | Tokyo Shibaura Electric Co | Heat exchanger tube design - incorporates longitudinal grooving and equally spaced circumferential grooves |
-
1987
- 1987-09-21 FR FR8713036A patent/FR2620805B1/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1413543A (en) * | 1964-11-05 | 1965-10-08 | Maschf Augsburg Nuernberg Ag | Tube with longitudinal ribs on the inside, in particular cooling tube for saturated steam during condensation |
FR1475915A (en) * | 1966-02-24 | 1967-04-07 | Coutisson Sa Atel | Improvements to tubes for heat exchangers |
FR2410238A1 (en) * | 1977-11-25 | 1979-06-22 | Tokyo Shibaura Electric Co | Heat exchanger tube design - incorporates longitudinal grooving and equally spaced circumferential grooves |
Also Published As
Publication number | Publication date |
---|---|
FR2620805B1 (en) | 1990-06-15 |
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