WO2000045103A1 - Method, system and component to increase heat transfers in a heat-exchanging device - Google Patents

Method, system and component to increase heat transfers in a heat-exchanging device Download PDF

Info

Publication number
WO2000045103A1
WO2000045103A1 PCT/FR2000/000236 FR0000236W WO0045103A1 WO 2000045103 A1 WO2000045103 A1 WO 2000045103A1 FR 0000236 W FR0000236 W FR 0000236W WO 0045103 A1 WO0045103 A1 WO 0045103A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubing
fluid
tube
contractions
formation
Prior art date
Application number
PCT/FR2000/000236
Other languages
French (fr)
Inventor
Jean-Luc Harion
Jean-Luc Bertin
Original Assignee
Armines
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 Armines filed Critical Armines
Publication of WO2000045103A1 publication Critical patent/WO2000045103A1/en

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
    • 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

Definitions

  • the present invention relates to methods, systems and components for increasing heat transfer in a heat exchanger device.
  • the present invention provides another solution to the problem of improving the efficiency of an exchanger.
  • the method according to the invention comprises the step of producing contractions and successive stretching of the fluid flowing in said tubing, in directions perpendicular to the direction of flow of the fluid in said tubing.
  • the mixing properties of said tubing are improved and the temperature gradients in the vicinity of the wall of said tubing are increased, which has the effect of increasing heat transfers.
  • the method according to the invention further comprises the step of avoiding the formation of recirculation pockets in said tubing.
  • This avoids the formation of zones where the heat transfer is very low.
  • the profile of said tubing is periodically modified without substantially modify its section.
  • the present invention also relates to a system for increasing heat transfers in a heat exchanger device comprising at least one tube traversed by a fluid having a temperature difference with respect to the external environment surrounding said tube.
  • the system according to the invention is such that said tubing has a profile suitable for producing successive contractions and stretchings of the fluid, in directions perpendicular to the direction of flow of the fluid in said tubing. Thanks to this structure of the tubing, the mixing properties are improved and the temperature gradients are increased in the vicinity of the wall of said tubing. Thus, heat transfers are increased.
  • said tubing has a suitable section to avoid the formation of recirculation pockets. Thus, the formation of zones where the heat transfer is very low is avoided.
  • a tubing whose profile varies periodically and whose section remains substantially constant.
  • the present invention also relates to a heat exchanger device comprising at least one tube traversed by a fluid having a temperature difference with respect to the external medium surrounding said tube.
  • the exchanger according to the invention is such that the pipes have a profile suitable for producing successive contractions and stretching in directions perpendicular to the direction of flow of the fluid. The mixing properties of the pipes are thus improved and the temperature gradients in the vicinity of the wall of the pipes are increased, which has the effect of increasing the heat transfers in the heat exchanger.
  • the heat exchanger device is such that the pipes have an appropriate section to avoid the formation of recirculation bags. So that it avoids the formation of zones where the thermal transfer is very faulty.
  • tubes are used whose profile varies periodically and whose section remains substantially constant.
  • the present invention also relates to a tubing component intended for the production of a heat exchanger device.
  • the tubing component is intended to be traversed by a fluid having a temperature difference with respect to the surrounding external environment.
  • the tubing component has a profile suitable for producing successive contractions and stretches of said fluid in directions perpendicular to the direction of flow of the fluid. So that the mixing properties of the tubing component are improved and the temperature gradients in the vicinity of the wall of the tubing component are increased, which has the effect of increasing heat transfers.
  • the tubing component has an appropriate section to avoid the formation of recirculation pockets.
  • the formation of zones where the heat transfer is very low is avoided.
  • the tubing component is such that its profile varies periodically and that its section remains substantially constant.
  • FIG. 1 which schematically represents a perspective view of an example of a profile of the sections of a tubular element according to the invention
  • FIG. 2 which shows a perspective view of a tubular heat exchanger.
  • the tube initially cylindrical, of axis 1, is deformed so as to produce, with substantially constant passage cross section, substantially elliptical shapes 2a, 2b and circular 3a, 3b, 3c successive alternating.
  • the deformation parameters are the amplitude of the ripples A and the spatial wavelength L.
  • the tube passes the fluid successively from a substantially elliptical vertical section to a substantially elliptical horizontal section, while maintaining a constant passage section.
  • a fluid element is then alternately stretched 4 in one direction and compressed 5 in the perpendicular direction during its flow in the tube.
  • Airflow visualizations were performed on a PVC tube with a diameter equal to 40 mm deformed according to this principle and compared with the case of a smooth tube.
  • the visualization method used consists of injecting smoke locally into the center of the tube in isokinetic condition and observing, with the aid of a laser slice, the trace of smoke in the outlet section.
  • the smoke stream is not mixed and remains approximately in the center of the tube, which is characteristic of a laminar flow.
  • the smoke is this time largely mixed and very quickly reaches the wall. This phenomenon, directly related to the stretches and compressions described above, has the corollary of an increase in heat transfer, since the temperature gradient close to the wall will, in this case, be increased significantly.
  • a similarly shaped copper tube with an internal diameter of 10 mm was tested on a hydraulic loop allowing simultaneous measurements of thermal performance and pressure drop.
  • the amplitude of the deformations was fixed at 1.5 mm, or 25% of the inside radius of the tube.
  • the wavelength L of the deformations in the direction of flow is equal to 60 mm, or twelve times the inside radius of the tube.
  • the efficiency factor E defined above is equal to 1.2 for a laminar flow regime. Measurements were made for different values of the number of
  • FIG. 2 represents a perspective view of an example of a heat exchanger using pipes according to the invention.
  • the hot fluid is distributed by collectors 19a and 19b.
  • the cold fluid circulates between the pipes 20a, 20b, 20c in the direction of arrow 21.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The invention relates to methods for increasing heat transfers in a heat exchanging device. The heat exchanger comprises at least one pipe (fig 1) containing a circulating liquid, presenting a difference in temperature in comparison with the outer environment surrounding said pipe. According to the invention, contractions (5) and successive elongations (4) of the liquid are produced in directions that are perpendicular to the direction (1) in which the liquid flows. The mixture properties of the pipe are improved and the temperature gradients of the wall of the pipe are also increased, resulting in increased heat transfers.

Description

Procédé, système et composant pour augmenter les transferts thermiques dans un dispositif échangeur de chaleur. Method, system and component for increasing heat transfer in a heat exchanger device.
La présente invention concerne les procédés, les systèmes et les composants pour augmenter les transferts thermiques dans un dispositif échangeur de chaleur.The present invention relates to methods, systems and components for increasing heat transfer in a heat exchanger device.
L'augmentation des performances d'échange de chaleur est au coeur de amélioration de l'efficacité d'un échangeur, et donc au centre de l'optimisation énergétique des procédés industriels. De très nombreuses études ont été et sont consacrées à l'accroissement de transfert dans des tubes. Plusieurs options technologiques ont été étudiées. Deux de ces options consistent à positionner des inserts à l'intérieur des tubes ou à créer des réductions de section. Ces solutions présentent l'inconvénient de générer des pertes de charge supplémentaires importantes et, notamment pour la seconde, de provoquer des poches de recirculation donnant naissance à des zones chaudes où le transfert de chaleur est très faible. Une alternative est proposée par l'utilisation de micro stries (simples ou croisées) sur la surface intérieure des tubes. Cette technique est très bien adaptée aux écoulements turbulents et conduit, dans ces conditions, à une efficacité de l'ordre de 1 ,2 {E = (h^ / u∞ (f f J. f étant le coefficient de perte de charge et hj le coefficient de transfert intérieur tube} .The increase in heat exchange performance is at the heart of improving the efficiency of an exchanger, and therefore at the center of the energy optimization of industrial processes. Numerous studies have been and are devoted to the increase of transfer in tubes. Several technological options have been studied. Two of these options consist of positioning inserts inside the tubes or creating section reductions. These solutions have the drawback of generating significant additional pressure drops and, in particular for the second, of causing recirculation pockets giving rise to hot zones where the heat transfer is very low. An alternative is proposed by the use of micro streaks (single or crossed) on the inner surface of the tubes. This technique is very well suited to turbulent flows and leads, under these conditions, to an efficiency of the order of 1, 2 {E = (h ^ / u ∞ (ff J. f being the pressure drop coefficient and hj the inner tube transfer coefficient}.
Cependant, il s'avère que cette technique se révèle moins efficace pour de faibles nombres de* Reynolds.However, it turns out that this technique proves to be less effective for low * Reynolds numbers.
La présente invention propose une autre solution au problème de l'amélioration de l'efficacité d'un échangeur. Pour augmenter les transferts thermiques dans un dispositif échangeur de chaleur comprenant au moins une tubulure parcourue par un fluide présentant un écart de température par rapport au milieu extérieur environnant ladite tubulure, le procédé selon l'invention comprend l'étape de produire des contractions et des étirements successifs du fluide s' écoulant dans ladite tubulure, dans des directions perpendiculaires à la direction d'écoulement du fluide dans ladite tubulure. Ainsi, les propriétés de mélange de ladite tubulure sont améliorées et les gradients de température au voisinage de la paroi de ladite tubulure sont augmentés, ce qui a pour effet d'accroître les transferts thermiques.The present invention provides another solution to the problem of improving the efficiency of an exchanger. To increase the heat transfers in a heat exchanger device comprising at least one tube traversed by a fluid having a temperature difference with respect to the external environment surrounding said tube, the method according to the invention comprises the step of producing contractions and successive stretching of the fluid flowing in said tubing, in directions perpendicular to the direction of flow of the fluid in said tubing. Thus, the mixing properties of said tubing are improved and the temperature gradients in the vicinity of the wall of said tubing are increased, which has the effect of increasing heat transfers.
De préférence, le procédé selon l'invention comprend en outre l'étape d'éviter la formation de poches de recirculation dans ladite tubulure. On évite ainsi la formation de zones où le transfert thermique est très faible. Avantageusement, pour produire une succession d' étirements et de contractions perpendiculaires à la direction d'écoulement du fluide dans ladite tubulure, tout en évitant la formation de poches de recirculation dans ladite tubulure, on modifie de manière périodique le profil de ladite tubulure sans sensiblement modifier sa section.Preferably, the method according to the invention further comprises the step of avoiding the formation of recirculation pockets in said tubing. This avoids the formation of zones where the heat transfer is very low. Advantageously, to produce a succession of stretching and contractions perpendicular to the direction of flow of the fluid in said tubing, while avoiding the formation of recirculation pockets in said tubing, the profile of said tubing is periodically modified without substantially modify its section.
La présente invention concerne également un système pour augmenter les transferts thermiques dans un dispositif échangeur de chaleur comprenant au moins une tubulure parcourue par un fluide présentant un écart de température par rapport au milieu extérieur environnant ladite tubulure. Le système selon l'invention est tel que ladite tubulure a un profil approprié pour produire des contractions et des étirements successifs du fluide, dans des directions perpendiculaires à la direction d'écoulement du fluide dans ladite tubulure. Grâce à cette structure de la tubulure, on améliore les propriétés de mélange et on augmente les gradients de température au voisinage de la paroi de ladite tubulure. Ainsi, on accroît les transferts thermiques. De préférence en outre, ladite tubulure a une section appropriée pour éviter la formation de poches de recirculation. Ainsi, on évite la formation de zones où le transfert thermique est très faible. Avantageusement, pour produire une succession d'étirements et de contractions perpendiculaires à la direction d'écoulement du fluide, sans entraîner la formation de poche de recirculation, on met en oeuvre une tubulure dont le profil varie de façon périodique et dont la section reste sensiblement constante.The present invention also relates to a system for increasing heat transfers in a heat exchanger device comprising at least one tube traversed by a fluid having a temperature difference with respect to the external environment surrounding said tube. The system according to the invention is such that said tubing has a profile suitable for producing successive contractions and stretchings of the fluid, in directions perpendicular to the direction of flow of the fluid in said tubing. Thanks to this structure of the tubing, the mixing properties are improved and the temperature gradients are increased in the vicinity of the wall of said tubing. Thus, heat transfers are increased. Preferably further, said tubing has a suitable section to avoid the formation of recirculation pockets. Thus, the formation of zones where the heat transfer is very low is avoided. Advantageously, to produce a succession of stretches and contractions perpendicular to the direction of flow of the fluid, without causing the formation of a recirculation pocket, a tubing whose profile varies periodically and whose section remains substantially constant.
La présente invention concerne également, une dispositif échangeur de chaleur comprenant au moins une tubulure parcourue par un fluide présentant un écart de température par rapport au milieu extérieur environnant ladite tubulure. L'échangeur selon l'invention est tel que les tubulures ont un profil approprié pour produire des contractions et des étirements successifs dans des directions perpendiculaires à la direction d'écoulement du fluide. Les propriétés de mélange des tubulures sont ainsi améliorées et les gradients de température au voisinage de la paroi des tubulures sont augmentés, ce qui a pour effet d'accroître les transferts thermiques dans l'échangeur de chaleur.The present invention also relates to a heat exchanger device comprising at least one tube traversed by a fluid having a temperature difference with respect to the external medium surrounding said tube. The exchanger according to the invention is such that the pipes have a profile suitable for producing successive contractions and stretching in directions perpendicular to the direction of flow of the fluid. The mixing properties of the pipes are thus improved and the temperature gradients in the vicinity of the wall of the pipes are increased, which has the effect of increasing the heat transfers in the heat exchanger.
En outre, de préférence, le dispositif échangeur de chaleur est tel que les tubulures ont une section appropriée pour éviter la formation de poches de recircuJation. De sorte que l'on évite ainsi la formation de zones où le transfert thermique est très faille.In addition, preferably, the heat exchanger device is such that the pipes have an appropriate section to avoid the formation of recirculation bags. So that it avoids the formation of zones where the thermal transfer is very faulty.
Avantageusement, pour produire une succession d' étirements et de contractions perpendiculaires à la direction d'écoulement du fluide, sans entraîner la formation de poches de recirculation, on met en oeuvre des tubulures dont le profil varie de façon périodique et dont la section reste sensiblement constante.Advantageously, to produce a succession of stretches and contractions perpendicular to the direction of flow of the fluid, without causing the formation of recirculation pockets, tubes are used whose profile varies periodically and whose section remains substantially constant.
La présente invention concerne également un composant-tubulure destiné à la réalisation d'un dispositif échangeur de chaleur. Le composant- tubulure est destiné à être parcouru par un fluide présentant un écart de température par rapport au milieu extérieur environnant. Le composant- tubulure a un profil approprié pour produire des contractions et àes étirements successifs dudit fluide dans des directions perpendiculaires à la direction d'écoulement du fluide. De sorte que les propriétés de mélange du composant-tubulure sont améliorées et que les gradients de température au voisinage de la paroi du composant-tubulure sont augmentés, ce qui a pour effet d'accroître les transferts thermiques.The present invention also relates to a tubing component intended for the production of a heat exchanger device. The tubing component is intended to be traversed by a fluid having a temperature difference with respect to the surrounding external environment. The tubing component has a profile suitable for producing successive contractions and stretches of said fluid in directions perpendicular to the direction of flow of the fluid. So that the mixing properties of the tubing component are improved and the temperature gradients in the vicinity of the wall of the tubing component are increased, which has the effect of increasing heat transfers.
De préférence, en outre, le composant-tubulure a une section appropriée pour éviter la formation de poches de recirculation. Ainsi, on évite la formation de zones où le transfert thermique est très faible.Preferably, moreover, the tubing component has an appropriate section to avoid the formation of recirculation pockets. Thus, the formation of zones where the heat transfer is very low is avoided.
Avantageusement, pour produire une succession d'étirements et de contractions perpendiculaires à la direction d'écoulement du fluide, sans entraîner la formation de poches de recirculation, le composant-tubulure est tel que son profil varie de façon périodique et que sa section reste sensiblement constante.Advantageously, to produce a succession of stretches and contractions perpendicular to the direction of flow of the fluid, without causing the formation of recirculation pockets, the tubing component is such that its profile varies periodically and that its section remains substantially constant.
D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description de variantes de réalisation de l'invention, données à titre d'exemple indicatif et non limitatif, et de :Other characteristics and advantages of the invention will appear on reading the description of alternative embodiments of the invention, given by way of non-limiting example, and from:
- la figure 1 qui représente de manière schématique une vue en perspective d'un exemple de profil des sections d'un élément tubulaire selon l'invention,FIG. 1 which schematically represents a perspective view of an example of a profile of the sections of a tubular element according to the invention,
- la figure 2 qui représente une vue en perspective d'un échangeur de chaleur tubulaire.- Figure 2 which shows a perspective view of a tubular heat exchanger.
On va maintenant décrire la figure 1. Le tube, initialement cylindrique, d'axe 1, est déformé de manière à réaliser, à section de passage sensiblement constant, des formes sensiblement elliptiques 2a, 2b et circulaires 3a, 3b, 3c alternées successives. Les paramètres de déformation sont l'amplitude des ondulations A et la longueur d'onde spatiale L. Le tube fait passer le fluide successivement d'une section sensiblement elliptique verticale à une section sensiblement elliptique horizontale, tout en conservant une section de passage constante. Comme le schématise la figure 1, un clément fluide est alors alternativement étiré 4 dans une direction et comprimé 5 dans la direction perpendiculaire pendant son écoulement dans le tube. Des visualisations d'écoulement d'air ont été effectuées sur un tube en PVC de diamètre égal à 40 mm déformé selon ce principe et comparées au cas d'un tube lisse. La méthode de visualisation utilisée consiste à injecter de la fumée localement au centre du tube en condition isocinétique et à observer, à l'aide d'une tranche laser, la trace de fumée dans la section de sortie. Dans le cas d'un tube lisse, le filet de fumée n'est pas mélangé et reste approximativement au centre du tube, ce qui est caractéristique d'un écoulement laminaire. Par contre, dans le cas d'un tube déformé (comme celui décrit en se référant à la figure 1), la fumée est cette fois largement mélangée et atteint très rapidement la paroi. Ce phénomène, directement lié aux étirements et compressions ci-dessus décrits, a pour corollaire une augmentation du transfert de chaleur, puisque le gradient de température proche de la paroi sera, dans ce cas, augmenté de façon significative.We will now describe FIG. 1. The tube, initially cylindrical, of axis 1, is deformed so as to produce, with substantially constant passage cross section, substantially elliptical shapes 2a, 2b and circular 3a, 3b, 3c successive alternating. The deformation parameters are the amplitude of the ripples A and the spatial wavelength L. The tube passes the fluid successively from a substantially elliptical vertical section to a substantially elliptical horizontal section, while maintaining a constant passage section. As shown schematically in Figure 1, a fluid element is then alternately stretched 4 in one direction and compressed 5 in the perpendicular direction during its flow in the tube. Airflow visualizations were performed on a PVC tube with a diameter equal to 40 mm deformed according to this principle and compared with the case of a smooth tube. The visualization method used consists of injecting smoke locally into the center of the tube in isokinetic condition and observing, with the aid of a laser slice, the trace of smoke in the outlet section. In the case of a smooth tube, the smoke stream is not mixed and remains approximately in the center of the tube, which is characteristic of a laminar flow. On the other hand, in the case of a deformed tube (like the one described with reference to FIG. 1), the smoke is this time largely mixed and very quickly reaches the wall. This phenomenon, directly related to the stretches and compressions described above, has the corollary of an increase in heat transfer, since the temperature gradient close to the wall will, in this case, be increased significantly.
Un tube de forme similaire en cuivre de diamètre intérieur égal à 10 mm a été testé sur une boucle hydraulique permettant les mesures simultanées des performances thermiques et des pertes de charge. L'amplitude des déformations a été fixée à 1,5 mm, soit 25% du rayon intérieur du tube. La longueur d'onde L des déformations dans le sens de l'écoulement est égale à 60 mm, soit douze fois le rayon intérieur du tube. Le facteur d'efficacité E ci-dessus défini vaut 1,2 pour un régime d'écoulement laminaire. Des mesures ont été effectuées pour différentes valeurs du nombre deA similarly shaped copper tube with an internal diameter of 10 mm was tested on a hydraulic loop allowing simultaneous measurements of thermal performance and pressure drop. The amplitude of the deformations was fixed at 1.5 mm, or 25% of the inside radius of the tube. The wavelength L of the deformations in the direction of flow is equal to 60 mm, or twelve times the inside radius of the tube. The efficiency factor E defined above is equal to 1.2 for a laminar flow regime. Measurements were made for different values of the number of
Reynolds, pour u tube lisse et pour un tube déformé selon l'invention. On constate que l'efficacité E est accrue en régime laminaire.Reynolds, for a smooth tube and for a deformed tube according to the invention. It is found that the efficiency E is increased in laminar regime.
On va maintenant décrire la figure 2 qui représente une vue en perspective d'un exemple d'échangeur de chaleur mettant en oeuvre des tubulures selon l'invention. Le fluide chaud est distribué par des collecteurs 19a etWe will now describe FIG. 2 which represents a perspective view of an example of a heat exchanger using pipes according to the invention. The hot fluid is distributed by collectors 19a and
19b vers les tubulures 20a, 20b, 20c, etc. Le fluide froid, circule entre les tubulures 20a, 20b, 20c dans le sens de la flèche 21. 19b to the pipes 20a, 20b, 20c, etc. The cold fluid circulates between the pipes 20a, 20b, 20c in the direction of arrow 21.

Claims

Revendications. Claims.
1. Procédé pour augmenter les transferts thermiques dans un dispositif échangeur de chaleur (fig 2) comprenant au moins une tubulure (fig 1) parcourue par un fluide présentant un écart de température par rapport au milieu extérieur environnant ladite tubulure, ledit procédé comprenant l'étape de produire des contractions (5) et des étirements (4) successifs du fluide s 'écoulant dans ladite tubulure, dans des directions perpendiculaires à la direction (1) d'écoulement du fluide dans ladite tubulure, de sorte que les propriétés de mélange de ladite tubulure sont améliorées et que les gradients de température au voisinage de la paroi de ladite tubulure sont augmentés, ce qui a pour effet d'accroître les transferts thermiques.1. Method for increasing heat transfers in a heat exchanger device (fig 2) comprising at least one tube (fig 1) traversed by a fluid having a temperature difference with respect to the external environment surrounding said tube, said method comprising step of producing contractions (5) and successive stretches (4) of the fluid flowing in said tube, in directions perpendicular to the direction (1) of flow of the fluid in said tube, so that the mixing properties of said tubing are improved and that the temperature gradients in the vicinity of the wall of said tubing are increased, which has the effect of increasing heat transfers.
2. Procédé selon la revendication 1 tel qu'il comprend en outre l'étape d'éviter la formation de poches de recirculation dans ladite tubulure, de sorte que l'on évite ainsi la formation de zones oύ le transfert thermique est très faible.2. The method of claim 1 as it further comprises the step of avoiding the formation of recirculation pockets in said tubing, so that it avoids the formation of areas where the heat transfer is very low.
3. Procédé selon la revendication 2 tel que pour produire une succession d' étirements et de contractions perpendiculaires à la direction d'écoulement du fluide dans ladite tubulure, en évitant la formation de poches de recirculation dans ladite tubulure, on modifie de manière périodique (L, 3a, 2a, 3b, 2b, 3 c) le profil de ladite tubulure sans sensiblement modifier sa section.3. Method according to claim 2 such that to produce a succession of stretching and contractions perpendicular to the direction of flow of the fluid in said tubing, avoiding the formation of recirculation pockets in said tubing, it is periodically modified ( L, 3a, 2a, 3b, 2b, 3 c) the profile of said tubing without substantially modifying its section.
4. Système pour augmenter les transferts thermiques dans un dispositif échangeur de chaleur (fig 2) comprenant au moins une tubulure4. System for increasing heat transfer in a heat exchanger device (fig 2) comprising at least one tube
(fig 1) parcourue par un fluide présentant un écart de température par rapport au milieu extérieur environnant ladite tubulure, ledit système étant tel que ladite tubulure a un profil approprié (2a, 2b, 3a, 3b) pour produire des contractions (5) et des étirements (4) successifs du fluide s'écoulant dans ladite tubulure, lesdits étirements (4) et contractions (5) s'effectuant dans des directions perpendiculaires à la direction (1) d'écoulement du fluide dans ladite tubulure, de sorte que les propriétés de mélange de ladite tubulure sont améliorées et que les gradients de température au voisinage de la paroi de ladite tubulure sont augmentés, ce qui a pour effet d'accroître les transferts thermiques.(fig 1) traversed by a fluid having a temperature difference with respect to the external environment surrounding said tubing, said system being such that said tubing has an appropriate profile (2a, 2b, 3a, 3b) to produce contractions (5) and successive stretches (4) of fluid flowing in said tubing, said stretches (4) and contractions (5) taking place in directions perpendicular to the direction (1) of fluid flow in said tubing, so that the mixing properties of said tubing are improved and that the temperature gradients in the vicinity of the wall of said tube are increased, which has the effect of increasing heat transfers.
5. Système selon la revendication 4 tel que ladite mbulure a une section appropriée poux éviter la formation de poches de rεcirculation dans ladite tubulure, de sorte que l'on évite ainsi la formation de zones où le transfert thermique est très faible.5. System according to claim 4 such that said bulb has an appropriate section to avoid the formation of recirculation pockets in said tube, so that the formation of zones where the heat transfer is very low is thus avoided.
6. Système selon la revendication 5 tel que pour produire une succession d'étirements et de contractions perpendiculaires à la direction d'écoulement du fluide dans ladite tubulure, sans entraîner la formation de poches de recirculation, on met en oeuvre une tubulure dont le profil varie de façon périodique (L,. 3a, 2a, 3b, 2b, 3c) et dont la section reste sensiblement constante.6. The system of claim 5 such that to produce a succession of stretches and contractions perpendicular to the direction of flow of the fluid in said tubing, without causing the formation of recirculation pockets, a tubing is used whose profile varies periodically (L ,. 3a, 2a, 3b, 2b, 3c) and the section of which remains substantially constant.
7. Dispositif échangeur de chaleur (fig 2) comprenant au moins une tubulure (20a, 20b, 20c)) parcourue par un fluide présentant un écart de température par rapport au milieu extérieur environnant ladite tubulure, ladite tubulure ayant un profil approprié pour produire des contractions (5) et des étirements (4) successifs dudit fluide, lesdits étirements et contractions s'effectuant dans des directions perpendiculaires à la direction (1) d'écoulement du fluide dans ladite tubulure, de sorte que les propriétés de mélange de ladite mbulure sont améliorées et que les gradients de température au voisinage de la paroi de ladite tubulure sont augmentés, ce qui a pour effet d'accroître les transferts thermiques.7. heat exchanger device (fig 2) comprising at least one tube (20a, 20b, 20c)) traversed by a fluid having a temperature difference with respect to the external environment surrounding said tube, said tube having a profile suitable for producing contractions (5) and successive stretches (4) of said fluid, said stretches and contractions being carried out in directions perpendicular to the direction (1) of flow of fluid in said tubing, so that the mixing properties of said bulb are improved and that the temperature gradients in the vicinity of the wall of said tube are increased, which has the effect of increasing heat transfers.
8. Dispositif échangeur de chaleur selon la revendication 7 tel que ladite tubulure a une section appropriée pour éviter la formation de poches de recirculation dans ladite tubulure, de sorte que l'on évite ainsi la foπnation de zones où le transfert thermique est très faible.8. A heat exchanger device according to claim 7 such that said tubing has a suitable section to avoid the formation of pockets. recirculation in said tubing, so that it avoids the foπnation of areas where the heat transfer is very low.
9. Dispositif échangeur de chaleur selon la revendication 8 tel que pour produire une succession d'étirεments (4) et de contractions (5) perpendiculaires à la direction (1) d'écoulement du fluide dans ladite mbulure, sans entraîner la formation de poches de recirculation, on met en oeuvre une tubulure dont le profil varie de façon périodique (L, 3a, 2a, 3b, 2b, 3c) et dont la section reste sensiblement constante. 9. A heat exchanger device according to claim 8 such as to produce a succession of stretches (4) and contractions (5) perpendicular to the direction (1) of flow of the fluid in said mold, without causing the formation of pockets. of recirculation, a tube is used whose profile varies periodically (L, 3a, 2a, 3b, 2b, 3c) and whose section remains substantially constant.
10. Composant-tubulure (fig 1) destiné à la réalisation d'un dispositif échangeur de chaleur (fig 2), ledit composant-tubulure étant destiné à être parcouru par un fluide présentant un écart de température par rapport au milieu extérieur environnant ladite mbulure (fig 1), ladite tubulure ayant un profil approprié pour produire des contractions (5) et des étirements (4) successifs dudit fluide, lesdits étirements et contractions s'effectuant dans des directions perpendiculaires à la direction (1) d'écoulement du fluide dans ladite tubulure, de sorte que les propriétés de mélange de ladite tubulure sont améliorées et que les gradients de température au voisinage de la paroi de ladite mbulure sont augmentés, ce qui a pour effet d'accroître les transferts thermiques.10. Tubing component (fig 1) intended for producing a heat exchanger device (fig 2), said tubing component being intended to be traversed by a fluid having a temperature difference with respect to the external environment surrounding said bulb (Fig 1), said tubing having a profile suitable for producing contractions (5) and stretching (4) successive of said fluid, said stretching and contractions taking place in directions perpendicular to the direction (1) of fluid flow in said tube, so that the mixing properties of said tube are improved and that the temperature gradients in the vicinity of the wall of said tube are increased, which has the effect of increasing heat transfers.
11. Composant-tubulure selon la revendication 10 tel que ladite mbulure a une section appropriée pour éviter la foπnation de poches de recirculation dans ladite tubulure, de sorte que l'on évite ainsi la formation de zones où le transfert thermique est très faible.11. Component-tubing according to claim 10 such that said bulb has a suitable section to avoid the formation of recirculation pockets in said tubing, so that the formation of zones where the heat transfer is very low is thus avoided.
12. Composant-tubulure selon la revendication 11, pour produire une succession d' étirements (4) et de contractions (5) perpendiculaires à la direction (1) d'écoulement du fluide dans ladite mbulure, sans entraîner la foπnation de poches de recirculation, ledit composant-mbulure étant tel que son profil varie de façon périodique (L, 3a, 2a, 3b, 2b, 3c) et que sa section reste sensiblement constante. 12. Component-tubing according to claim 11, for producing a succession of stretches (4) and contractions (5) perpendicular to the direction (1) of flow of the fluid in said bulb, without causing the formation of recirculation pockets. , said component-mold being such that its profile varies periodically (L, 3a, 2a, 3b, 2b, 3c) and that its section remains substantially constant.
PCT/FR2000/000236 1999-02-01 2000-02-01 Method, system and component to increase heat transfers in a heat-exchanging device WO2000045103A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9901264A FR2789166B1 (en) 1999-02-01 1999-02-01 METHOD, SYSTEM AND COMPONENT FOR INCREASING THERMAL TRANSFERS IN A HEAT EXCHANGER DEVICE
FR99/01264 1999-02-01

Publications (1)

Publication Number Publication Date
WO2000045103A1 true WO2000045103A1 (en) 2000-08-03

Family

ID=9541570

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR2000/000236 WO2000045103A1 (en) 1999-02-01 2000-02-01 Method, system and component to increase heat transfers in a heat-exchanging device

Country Status (2)

Country Link
FR (1) FR2789166B1 (en)
WO (1) WO2000045103A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR733073A (en) * 1930-12-03 1932-09-30 Brown Protection device against tearing or bursting of tubes exposed to the risk of freezing, especially for refrigeration installations
FR1509954A (en) * 1965-09-16 1968-01-19 Linde Ag heat exchanger
DE2539971A1 (en) * 1975-09-02 1977-03-10 Becker Apparatebau Geb Heater for highly viscous mediums - uses flow pipe with corrugations in two directions for heating foods
DE8704409U1 (en) * 1987-03-25 1988-06-30 Schönhammer, Johann, 8317 Mengkofen Counterflow heat exchanger
DE9418641U1 (en) * 1994-11-22 1995-03-02 Armand, Gunter, Dipl.-Ing., 87439 Kempten Heat exchange tube
US5417199A (en) * 1993-11-02 1995-05-23 Lennox Industries Inc. Heating apparatus convertible for upflow or downflow operation
DE29709136U1 (en) * 1997-05-24 1997-07-24 Viessmann Werke Gmbh & Co, 35108 Allendorf Heat exchanger tube

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR733073A (en) * 1930-12-03 1932-09-30 Brown Protection device against tearing or bursting of tubes exposed to the risk of freezing, especially for refrigeration installations
FR1509954A (en) * 1965-09-16 1968-01-19 Linde Ag heat exchanger
DE2539971A1 (en) * 1975-09-02 1977-03-10 Becker Apparatebau Geb Heater for highly viscous mediums - uses flow pipe with corrugations in two directions for heating foods
DE8704409U1 (en) * 1987-03-25 1988-06-30 Schönhammer, Johann, 8317 Mengkofen Counterflow heat exchanger
US5417199A (en) * 1993-11-02 1995-05-23 Lennox Industries Inc. Heating apparatus convertible for upflow or downflow operation
DE9418641U1 (en) * 1994-11-22 1995-03-02 Armand, Gunter, Dipl.-Ing., 87439 Kempten Heat exchange tube
DE29709136U1 (en) * 1997-05-24 1997-07-24 Viessmann Werke Gmbh & Co, 35108 Allendorf Heat exchanger tube

Also Published As

Publication number Publication date
FR2789166B1 (en) 2001-12-14
FR2789166A1 (en) 2000-08-04

Similar Documents

Publication Publication Date Title
EP0912868B1 (en) Apparatus for exchanging heat between at least three fluids
CH644684A5 (en) ATMOSPHERIC HEATER.
EP2872848A1 (en) Supercharge air cooler
FR2766914A1 (en) DISTRIBUTOR FOR FITTING INTRATUBULAR HEAT EXCHANGERS OF DIPHASIC-TYPE REFRIGERATION FLUID COOLING PLANTS
FR2823839A1 (en) HEAT EXCHANGER
WO2002090860A1 (en) Heat exchanger for gas
Labed et al. Etude théorique et expérimentale des performances d’un capteur solaire plan à air muni d’une nouvelle forme de rugosité artificielle
WO2000045103A1 (en) Method, system and component to increase heat transfers in a heat-exchanging device
EP0117829B2 (en) Tubular heat exchanger
FR2518243A1 (en) OIL REFRIGERANT TYPE A PLAQUES
EP3847408B1 (en) Flexible heat exchanger intended to be positioned in a moving exterior fluid, comprising a collection of flexible temperature probes
FR2664682A1 (en) HEAT EXCHANGER.
FR2776058A1 (en) MULTI-FLOW HEAT EXCHANGER COMPRISING INLET AND OUTLET CONDUITS OF REFRIGERANT AGENT INTERCONNECTED THROUGH PLATE-TUBE PASSAGES
CA2150457A1 (en) Chaotic convection effect mixing exchanger
FR2902181A1 (en) Thermal conductor for vacuum solar sensor, has central part receiving heat transferring unit made of heat conductive material e.g. aluminum and its alloy, copper and its alloy or magnesium and its alloy, where unit is obtained by extrusion
FR2717256A1 (en) Motor vehicle heat exchanger
FR2963418A1 (en) Thermal installation for use in building i.e. dwelling, has fins formed by folded plates and fixed at walls on level of fold crests, and heat pump comprising heat exchanger that is provided with refrigerant duct
CN112129093B (en) A hot water steam switches heating device for donkey-hide gelatin is distinguished and is detected
FR3073612A1 (en) HEAT EXCHANGER TUBE WITH PERTURBATION DEVICE
BE690577A (en)
BE1009104A3 (en) Venturi a cavitation and multiple nozzles.
FR2961587A1 (en) Heat exchanger i.e. heat pipe exchanger, for use with Rankine cycle energy recovery device in motor vehicle to cool fluids, has pipes whose condenser sides are in contact with circulation circuit for connecting duct to circulation circuit
CH514828A (en) Method and apparatus for cooling a heat radiating object
BE1004276A6 (en) Heat exchanger between a gas and a fluid with a high heat exchange capacity
FR2465984A1 (en) Tube and plate vehicle radiator heat exchanger - has crests and troughs in plate corrugations opposing each other with straight interposed sectors

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
122 Ep: pct application non-entry in european phase