EP1782659B1 - Device for heating grounds, in particular sports grounds - Google Patents

Device for heating grounds, in particular sports grounds Download PDF

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Publication number
EP1782659B1
EP1782659B1 EP05798611A EP05798611A EP1782659B1 EP 1782659 B1 EP1782659 B1 EP 1782659B1 EP 05798611 A EP05798611 A EP 05798611A EP 05798611 A EP05798611 A EP 05798611A EP 1782659 B1 EP1782659 B1 EP 1782659B1
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EP
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Prior art keywords
heating
installation according
ground
transformer
transformers
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EP05798611A
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German (de)
French (fr)
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EP1782659A1 (en
Inventor
Jean-Claude Beisser
Jean-Marc Scherrer
Jean-Paul Scherrer
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Brevetix SARL
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Brevetix SARL
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/54—Heating elements having the shape of rods or tubes flexible
    • H05B3/56—Heating cables
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C13/00—Pavings or foundations specially adapted for playgrounds or sports grounds; Drainage, irrigation or heating of sports grounds
    • E01C13/02—Foundations, e.g. with drainage or heating arrangements
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C13/00—Pavings or foundations specially adapted for playgrounds or sports grounds; Drainage, irrigation or heating of sports grounds
    • E01C13/08—Surfaces simulating grass ; Grass-grown sports grounds
    • E01C13/083—Construction of grass-grown sports grounds; Drainage, irrigation or heating arrangements therefor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/026—Heaters specially adapted for floor heating

Definitions

  • the present invention relates to a device for providing the heating of grounds and in particular the frosting of sports fields.
  • Ground heating devices of this type have a major disadvantage in that the electrical energy is transported from the transformer to the sector to be heated by energy connections which are extremely expensive to use, on the one hand by quantity of energy consumed and, secondly, in raw material cost. Moreover, in this type of installation, all the sectors that one wishes to heat do not have identical characteristics in particular as regards their resistivity, so that if one wishes to bring them to the same temperature it is necessary to distribute a specific heating power according to these characteristics.
  • the purpose of the present invention is thus to propose a device intended to ensure the heating of grounds, and in particular, sports fields, which allow them to be set free from frost, and this in a totally safe way with regard to the implementation of the electric current and, secondly, by making notable savings, both in terms of electricity consumption and the cost of implementation.
  • the present device also aims to allow adjustment of the power delivered by each transformer element with the zone to be heated corresponding thereto.
  • the present invention thus relates to an installation for heating a terrain, particularly sports, by means of cables powered by electric current which are buried in the ground thereof, characterized in that the surface of the ground to be heated is divided into several sectors, and each sector is heated by at least two heating lines each constituting a secondary of the same transformer.
  • the transformer will preferably be of toric type, and its secondary winding will be made of a metal of lower conductivity than that of the heating lines, the secondary winding can thus be made of copper and the aluminum heating lines.
  • the diameter of the wire of the secondary winding and that of the heating line can thus have identical diameters which facilitates in particular the connection problems.
  • the transformers will be placed in close proximity to the ground, preferably in a technical gallery buried in the ground.
  • the primary winding of the transformers will comprise a screen formed of a metal strip, preferably consisting of aluminum or copper.
  • the cable constituting the secondary winding of the transformer will advantageously be made of two conductive elements twisted on one another.
  • the heating installation consists of a series of transformers 3a, 3b, 3c,..., 3n, each of which is associated with the heating of a given sector of land 1a, 1b, 1c, ..., 1n.
  • a transformer thus provides, for example, the supply of three heating lines 9, 9 ', 9 "of a given sector, these heating lines being buried in the ground of each of these sectors, and evenly distributed or not in the space of the sectors and this according to the calorific needs of each of these.
  • the primary 5 of each of these transformers is fed by a three-phase electrical line 7 formed of two phase lines L1, L2 and a neutral line N.
  • a three-phase electrical line 7 formed of two phase lines L1, L2 and a neutral line N.
  • the three The primary windings of the transformers 3a, 3b and 3c are respectively fed on the lines L1-L2, L2-N and L1-N.
  • Each of the three heating lines 9, 9 ', 9 "associated with a transformer 3a, 3b, 3c, ..., 3n is respectively connected to a secondary winding 8, 8', 8" thereof.
  • FIG. 2 and 3 such a transformer which essentially comprises a toric core 10 around which is wound the primary winding 5 and the three secondary windings 8, 8 'and 8 ".
  • Each secondary winding consists of five turns which are made in a copper conductor and which are connected at each of their ends, via a connector element 12, to an associated heating line 9, 9 ', 9 "whose length is such that it enables it to cover a determined portion of the surface of the sector to heat.
  • the primary winding 5 consists of a larger number of windings of smaller diameter
  • the conductive wire used is also made of copper.
  • the conductive wire will advantageously comprise an electrostatic screen which will be integrated and which consists of a thin strip of aluminum or copper.
  • each of the sectors to be heated 1a, 1b, 1c, ..., 1n is different from the sectors that are adjacent to it, so that each of them will require the use of a line of heating 9, 9 ', 9 "capable of delivering a different power.
  • the present invention makes it possible precisely to give the user the possibility of adjusting, once in the field, the power delivered by each secondary winding as a function of the specific physical parameters of the soil to be heated and of its specific heat requirements, and this by playing on the tension delivered by it.
  • This supply voltage can be controlled by varying the number of turns of each of the secondary windings.
  • an average supply voltage will be obtained with a given number of turns, (for example five) which will leave the user the possibility of either deleting one or two turns if it wishes to decrease the tension, or to add a two turns if it wishes to increase it.
  • transformers 3 can be arranged in a technical gallery 16 made for example in a trench dug in the ground at the edge of the ground.
  • the transformers can be made completely sealed by coating their magnetic circuit in a product consisting for example of a resin.
  • the turns constituting the secondary winding and the heating wires which are buried in the ground may be of different natures. It will thus be possible to achieve the turns of the secondary winding in a metal of very good electrical conductivity which will minimize the heating of the secondary of the transformer, and to make the turns constituting the heating lines 9, 9 ', 9 "in a metal of higher resistivity.
  • these elements will preferably have identical diameters, it being understood that the difference in resistance of these two elements will be due solely to the difference in resistivity between the respective materials chosen to constitute the turns of the secondary winding and the heating elements.
  • the heating cable will in fact be made of two elements which will be twisted on one another, which makes it possible to avoid any magnetic field formation induced by these cables around the ground to be heated.
  • the output voltage of the secondary of the transformers will be of the order of 40 to 50 volts and the resistances constituted by the heating lines 9,
  • this primary conductor consists of the inside to the outside of a conducting wire 18 made of aluminum, an insulating layer 20 constituted for example by polyvinyl chloride, a copper strip 22 constituting the screen and finally an outer layer 24 insulating and sealed, for example polyvinyl chloride.
  • the installation according to the invention was able to ensure the heating of a sports ground of 6000 m2 under an outside temperature of -10 ° C. and to put it freeze-free at a temperature of 5 ° C.
  • the secondary of these transformers consisted of five windings delivering each a power of 4 kVA and the resistance of the heating lines 9 were of the order of 0.6 ⁇ .

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Resistance Heating (AREA)
  • Road Paving Structures (AREA)
  • Control Of Resistance Heating (AREA)
  • Central Heating Systems (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • General Induction Heating (AREA)
  • Artificial Filaments (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Surface Heating Bodies (AREA)
  • Floor Finish (AREA)

Abstract

An installation for heating grounds, in particular sports grounds, using cables (9, 9′, 9″) supplied with electric current which are buried in the ground. The installation is characterized in that the surface of the grounds to be heated is divided into a number of sectors (1a, 1b, 1c, . . . , 1n), and each sector is heated by at least two heating lines (9, 9′, 9″) constituting each a secondary of a common transformer (3a, 3b et 3c).

Description

La présente invention concerne un dispositif destiné à assurer le chauffage de terrains et notamment la mise hors gel de terrains de sport.The present invention relates to a device for providing the heating of grounds and in particular the frosting of sports fields.

On connaît ( US-A-5814792 , US-A-5854472 , WO 93/19565 A , US-A-4839500 ) de tels dispositifs de chauffage qui font pour ce faire appel à des câbles conducteurs qui sont enterrés dans le sol et qui sont alimentés en courant électrique par l'intermédiaire de transformateurs qui sont disposés dans un local technique voisin du terrain à chauffer. Ce dernier est subdivisé en plusieurs secteurs creusés de tranchées dans lesquelles les câbles de chauffage reliés au secondaire du transformateur sont disposés.We know ( US Patent 5814792 , US Patent 5854472 , WO 93/19565 A , US Patent 4839500 ) such heaters that make use of conductive cables that are buried in the ground and are supplied with electrical current through transformers which are arranged in a nearby technical premises of the ground to be heated. The latter is subdivided into several sectors dug trenches in which the heating cables connected to the secondary of the transformer are arranged.

Les dispositifs dé chauffage de terrains de ce type présentent un inconvénient majeur en ce que l'énergie électrique est transportée du transformateur vers le secteur à chauffer par des liaisons d'énergie qui se révèlent à l'usage extrêmement coûteuses, d'une part en quantité d'énergie consommée et, d'autre part, en coût de matière première. Par ailleurs, dans ce type d'installation, tous les secteurs que l'on souhaite chauffer ne possèdent pas des caractéristiques identiques notamment en ce qui concerne leur résistivité, si bien que si on souhaite les porter à une même température il est nécessaire de leur distribuer une puissance de chauffage spécifique fonction de ces caractéristiques.Ground heating devices of this type have a major disadvantage in that the electrical energy is transported from the transformer to the sector to be heated by energy connections which are extremely expensive to use, on the one hand by quantity of energy consumed and, secondly, in raw material cost. Moreover, in this type of installation, all the sectors that one wishes to heat do not have identical characteristics in particular as regards their resistivity, so that if one wishes to bring them to the same temperature it is necessary to distribute a specific heating power according to these characteristics.

Enfin, ce type d'installation doit être totalement irréprochable au niveau de la sécurité électrique.Finally, this type of installation must be completely irreproachable in terms of electrical safety.

La présente invention a ainsi pour but de proposer un dispositif destiné à assurer le chauffage de terrains, et notamment de terrains destinés au sport, permettant d'assurer une mise hors gel de ceux-ci, et ceci de façon totalement sûre en ce qui concerne la mise en oeuvre du courant électrique et, d'autre part, en réalisant des économies notables, tant au point de vue de la consommation électrique qu'à celui du coût de la mise en oeuvre. Le présent dispositif a également pour but de permettre un ajustement de la puissance délivrée par chaque élément de transformateur avec la zone à chauffer qui lui correspond.The purpose of the present invention is thus to propose a device intended to ensure the heating of grounds, and in particular, sports fields, which allow them to be set free from frost, and this in a totally safe way with regard to the implementation of the electric current and, secondly, by making notable savings, both in terms of electricity consumption and the cost of implementation. The present device also aims to allow adjustment of the power delivered by each transformer element with the zone to be heated corresponding thereto.

La présente invention a ainsi pour objet une installation de chauffage d'un terrain, notamment de sport, au moyen de câbles alimentés en courant électrique qui sont enterrés dans le sol de celui-ci, caractérisée en ce que la surface du terrain à chauffer est divisée en plusieurs secteurs, et chaque secteur est chauffé par au moins deux lignes de chauffage constituant chacune un secondaire d'un même transformateur.The present invention thus relates to an installation for heating a terrain, particularly sports, by means of cables powered by electric current which are buried in the ground thereof, characterized in that the surface of the ground to be heated is divided into several sectors, and each sector is heated by at least two heating lines each constituting a secondary of the same transformer.

Le transformateur sera préférentiellement de type torique, et son enroulement secondaire sera réalisé en un métal de plus faible conductivité que celle des lignes de chauffage, l'enroulement secondaire pouvant ainsi être réalisé en cuivre et les lignes de chauffage en aluminium. De cette manière le diamètre du fil de l'enroulement secondaire et celui de la ligne de chauffage pourront ainsi avoir des diamètres identiques ce qui facilite notamment les problèmes de connexion.The transformer will preferably be of toric type, and its secondary winding will be made of a metal of lower conductivity than that of the heating lines, the secondary winding can thus be made of copper and the aluminum heating lines. In this way the diameter of the wire of the secondary winding and that of the heating line can thus have identical diameters which facilitates in particular the connection problems.

Afin de réduire au maximum les lignes d'énergie les transformateurs seront disposés à proximité immédiate du terrain, préférentiellement dans une galerie technique enfouie dans le sol.In order to minimize the energy lines the transformers will be placed in close proximity to the ground, preferably in a technical gallery buried in the ground.

Dans un mode de mise en oeuvre particulièrement intéressant de l'invention l'enroulement primaire des transformateurs comprendra un écran formé d'un feuillard métallique, préférentiellement constitué d'aluminium ou de cuivre.In a particularly advantageous embodiment of the invention, the primary winding of the transformers will comprise a screen formed of a metal strip, preferably consisting of aluminum or copper.

Le câble constituant l'enroulement secondaire du transformateur sera avantageusement réalisé en deux éléments conducteurs torsadés l'un sur l'autre.The cable constituting the secondary winding of the transformer will advantageously be made of two conductive elements twisted on one another.

On décrira ci-après, à titre d'exemple non limitatif, une forme d'exécution de la présente invention, en référence au dessin annexé sur lequel :

  • La figure 1 est une vue schématique d'une installation de chauffage suivant l'invention.
  • La figure 2 est une vue de dessus d'un transformateur utilisé dans l'installation suivant l'invention.
  • La figure 3 est une vue en coupe du transformateur représenté sur la figure 1 suivant la ligne III-III de celle-ci.
  • La figure 4 est une vue schématique en coupe verticale montrant la galerie technique adjacente au terrain à chauffer.
  • La figure 5 est une vue de dessus schématique d'un terrain de football chauffé par l'installation suivant l'invention.
  • La figure 6 est une vue en section droite d'un câble d'enroulement primaire utilisé dans l'installation suivant l'invention.
An embodiment of the present invention will be described hereinafter by way of nonlimiting example, with reference to the appended drawing in which:
  • The figure 1 is a schematic view of a heating installation according to the invention.
  • The figure 2 is a top view of a transformer used in the installation according to the invention.
  • The figure 3 is a sectional view of the transformer shown on the figure 1 along line III-III thereof.
  • The figure 4 is a schematic view in vertical section showing the technical gallery adjacent to the ground to be heated.
  • The figure 5 is a schematic top view of a football field heated by the installation according to the invention.
  • The figure 6 is a cross-sectional view of a primary winding cable used in the installation according to the invention.

On a représenté de façon schématique sur la figure 1 une partie d'un terrain de sport 1 qui est divisé en plusieurs secteurs, à savoir des secteurs 1a, 1b, 1c qui sont destinés à être chauffés de façon, par exemple, à les mettre hors gel.It is shown schematically on the figure 1 part of a sports field 1 which is divided into several sectors, namely sectors 1a, 1b, 1c which are intended to be heated so, for example, to put them off frost.

L'installation de chauffage est constituée d'une série de transformateurs 3a, 3b, 3c,..., 3n qui sont chacun associés au chauffage d'un secteur de terrain déterminé 1a, 1b, 1c, ...,1n. Un transformateur assure ainsi, par exemple, l'alimentation de trois lignes de chauffage 9, 9', 9" d'un secteur déterminé, ces lignes de chauffage étant enfouies dans le sol de chacun de ces secteurs, et se répartissant uniformément ou non dans l'espace des secteurs et ceci en fonction des besoins calorifiques de chacun de ceux-ci.The heating installation consists of a series of transformers 3a, 3b, 3c,..., 3n, each of which is associated with the heating of a given sector of land 1a, 1b, 1c, ..., 1n. A transformer thus provides, for example, the supply of three heating lines 9, 9 ', 9 "of a given sector, these heating lines being buried in the ground of each of these sectors, and evenly distributed or not in the space of the sectors and this according to the calorific needs of each of these.

Plus précisément le primaire 5 de chacun de ces transformateurs est alimenté par une ligne électrique triphasée 7 formée de deux lignes de phases L1,L2 et une ligne de neutre N. De façon classique, et afin de ne pas déséquilibrer l'installation, les trois enroulements primaires des transformateurs 3a, 3b et 3c sont respectivement alimentés sur les lignes L1-L2, L2-N et L1-N.More precisely, the primary 5 of each of these transformers is fed by a three-phase electrical line 7 formed of two phase lines L1, L2 and a neutral line N. Conventionally, and in order not to unbalance the installation, the three The primary windings of the transformers 3a, 3b and 3c are respectively fed on the lines L1-L2, L2-N and L1-N.

Chacune des trois lignes de chauffage 9, 9', 9" associée à un transformateur 3a, 3b, 3c, ...,3n est respectivement reliée à un enroulement secondaire 8, 8', 8" de celui-ci.Each of the three heating lines 9, 9 ', 9 "associated with a transformer 3a, 3b, 3c, ..., 3n is respectively connected to a secondary winding 8, 8', 8" thereof.

On a représenté sur les figures 2 et 3 un tel transformateur qui comprend essentiellement un noyau torique 10 autour duquel est enroulé l'enroulement primaire 5 et les trois enroulements secondaires 8, 8' et 8". (Pour plus de clarté du dessin, on n'a représenté sur celui-ci que l'enroulement 8). Chaque enroulement secondaire est constitué de cinq spires qui sont réalisées dans un conducteur en cuivre et qui sont reliées à chacune de leurs extrémité, par l'intermédiaire d'un élément connecteur 12, à une ligne de chauffage associée 9, 9', 9" dont la longueur est telle qu'elle lui permet de couvrir une portion déterminée de la surface du secteur à chauffer.We have shown on Figures 2 and 3 such a transformer which essentially comprises a toric core 10 around which is wound the primary winding 5 and the three secondary windings 8, 8 'and 8 ". (For the sake of clarity of the drawing, there is shown on this one only 8) Each secondary winding consists of five turns which are made in a copper conductor and which are connected at each of their ends, via a connector element 12, to an associated heating line 9, 9 ', 9 "whose length is such that it enables it to cover a determined portion of the surface of the sector to heat.

L'enroulement primaire 5 quant à lui est constitué d'un plus grand nombre d'enroulements de plus faible diamètre, le fil conducteur utilisé étant constitué également de cuivre. Le fil conducteur comportera avantageusement un écran électrostatique qui lui sera intégré et qui est constitué d'un mince feuillard d'aluminium ou de cuivré.The primary winding 5 consists of a larger number of windings of smaller diameter, the conductive wire used is also made of copper. The conductive wire will advantageously comprise an electrostatic screen which will be integrated and which consists of a thin strip of aluminum or copper.

On comprend qu'en fonction des conditions environnementales, chacun des secteurs à chauffer 1a, 1b, 1c, ...,1n est différent des secteurs qui lui sont voisins, si bien que chacun d'eux nécessitera de faire appel à une ligne de chauffage 9, 9', 9" susceptible de délivrer une puissance différente.It is understood that, depending on the environmental conditions, each of the sectors to be heated 1a, 1b, 1c, ..., 1n is different from the sectors that are adjacent to it, so that each of them will require the use of a line of heating 9, 9 ', 9 "capable of delivering a different power.

La présente invention permet justement de donner à l'utilisateur la possibilité d'ajuster, une fois sur le terrain, la puissance délivrée par chaque enroulement secondaire en fonction des paramètres physiques spécifiques du sol à chauffer et de ses besoins spécifiques en chaleur, et ceci en jouant sur la tension délivrée par celui-ci. Cette tension d'alimentation pourra être contrôlée en faisant varier le nombre de spires de chacun des enroulements secondaires.The present invention makes it possible precisely to give the user the possibility of adjusting, once in the field, the power delivered by each secondary winding as a function of the specific physical parameters of the soil to be heated and of its specific heat requirements, and this by playing on the tension delivered by it. This supply voltage can be controlled by varying the number of turns of each of the secondary windings.

Ainsi on pourra prévoir qu'une tension moyenne d'alimentation sera obtenue avec un nombre donné de spires, (par exemple cinq) ce qui laissera à l'utilisateur la possibilité soit de supprimer une ou deux spires s'il souhaite diminuer la tension, soit de rajouter une deux spires s'il souhaite l'augmenter.Thus it will be possible to provide that an average supply voltage will be obtained with a given number of turns, (for example five) which will leave the user the possibility of either deleting one or two turns if it wishes to decrease the tension, or to add a two turns if it wishes to increase it.

Ainsi que représenté sur la figure 4, les transformateurs 3 pourront être disposés dans une galerie technique 16 réalisée par exemple dans une tranchée creusée dans le sol en bordure du terrain.As shown on the figure 4 transformers 3 can be arranged in a technical gallery 16 made for example in a trench dug in the ground at the edge of the ground.

A cet effet, les transformateurs pourront être rendus totalement étanches par enrobage de leur circuit magnétique dans un produit constitué par exemple d'une résine.For this purpose, the transformers can be made completely sealed by coating their magnetic circuit in a product consisting for example of a resin.

Afin de minimiser les pertes par effet joules dans le secondaire des transformateurs, les spires constituant l'enroulement secondaire et les fils chauffants qui sont enterrés dans le terrain pourront être de natures différentes. Il sera ainsi possible de réaliser les spires de l'enroulement secondaire dans un métal de très bonne conductivité électrique ce.qui réduira au maximum le chauffage du secondaire du transformateur, et de réaliser les spires constituant les lignes de chauffage 9, 9', 9" dans un métal de plus forte résistivité.In order to minimize the joules losses in the secondary of the transformers, the turns constituting the secondary winding and the heating wires which are buried in the ground may be of different natures. It will thus be possible to achieve the turns of the secondary winding in a metal of very good electrical conductivity which will minimize the heating of the secondary of the transformer, and to make the turns constituting the heating lines 9, 9 ', 9 "in a metal of higher resistivity.

Afin d'optimiser la qualité et la facilité de la connexion entre les spires du secondaire et les lignes de chauffage 9, 9', 9" ces éléments auront préférentiellement des diamètres identiques. On comprend dès lors que la différence de résistance de ces deux éléments sera due à la seule différence de résistivité entre les matériaux respectifs choisis pour constituer les spires de l'enroulement secondaire et des éléments chauffants. On a constaté qu'en réalisant les spires en cuivre et les câbles chauffants en aluminium on obtenait un rapport de conductivité satisfaisant permettant de mettre en oeuvre une telle solution. (Le rapport de la conductivité du cuivre sur celle de l'aluminium est en effet de 1,6).In order to optimize the quality and the ease of the connection between the secondary turns and the heating lines 9, 9 ', 9 ", these elements will preferably have identical diameters, it being understood that the difference in resistance of these two elements will be due solely to the difference in resistivity between the respective materials chosen to constitute the turns of the secondary winding and the heating elements.We realized that by making the copper turns and the aluminum heating cables a conductivity ratio was obtained. satisfying to implement such a solution. (The report of the conductivity of copper over that of aluminum is indeed 1.6).

Préférentiellement, le câble chauffant sera en fait réalisé en deux éléments qui seront torsadés l'un sur l'autre ce qui permet d'éviter toute formation de champ magnétique induit par ces câbles à l'entour du terrain à chauffer.Preferably, the heating cable will in fact be made of two elements which will be twisted on one another, which makes it possible to avoid any magnetic field formation induced by these cables around the ground to be heated.

La tension de sortie des secondaires des transformateurs sera de l'ordre de 40 à 50 volts et les résistances constituées par les lignes de chauffage 9,The output voltage of the secondary of the transformers will be of the order of 40 to 50 volts and the resistances constituted by the heating lines 9,

9', 9" seront de l'ordre de 0,5 à 0,8Ω, la puissance fournie par le secondaire de chacun des enroulements du transformateur étant alors de l'ordre de 20 kVA.9 ', 9 "will be of the order of 0.5 to 0.8Ω, the power supplied by the secondary of each of the windings of the transformer then being of the order of 20 kVA.

On a représenté en section droite sur la figure 6, un câble conducteur constituant le primaire du transformateur. On constate que ce conducteur primaire est constitué de l'intérieur vers l'extérieur d'un fil conducteur 18 en aluminium, d'une couche isolante 20 constituée par exemple de chlorure de polyvinyle, d'un feuillard de cuivre 22 constituant l'écran et enfin d'une couche externe 24 isolante et étanche, par exemple en chlorure de polyvinyle.It is shown in cross-section on the figure 6 , a conductive cable constituting the primary of the transformer. It can be seen that this primary conductor consists of the inside to the outside of a conducting wire 18 made of aluminum, an insulating layer 20 constituted for example by polyvinyl chloride, a copper strip 22 constituting the screen and finally an outer layer 24 insulating and sealed, for example polyvinyl chloride.

A titre d'exemple il a été établi que l'installation suivant l'invention était en mesure d'assurer le chauffage d'un terrain de sport de 6000 m2 sous une température extérieure de -10°C et de le mettre hors gel à une température de 5°C. Pour ce faire on a fait appel à une série de vingt quatre transformateurs répartis le long du terrain dans une gaine technique enfouie dans le sol d'une puissance unitaire de 20 kVA délivrant ainsi une puissance globale de 480 kVA. Les secondaires de ces transformateur comportaient cinq enroulements délivrant chacun une puissance de 4 kVA et la résistance des lignes de chauffage 9 étaient de l'ordre de 0,6 Ω.By way of example, it has been established that the installation according to the invention was able to ensure the heating of a sports ground of 6000 m2 under an outside temperature of -10 ° C. and to put it freeze-free at a temperature of 5 ° C. To do this, we used a series of twenty four transformers distributed along the ground in a technical sheath buried in the ground with a unit power of 20 kVA thus delivering an overall power of 480 kVA. The secondary of these transformers consisted of five windings delivering each a power of 4 kVA and the resistance of the heating lines 9 were of the order of 0.6 Ω.

Claims (11)

  1. Ground heating installation, in particular for a sports ground, using cables (9, 9', 9") supplied with electric current, which are buried in the ground, the surface of the ground to be heated being divided into several sectors (1a, 1b, 1c, ..., 1n), and characterized in that each sector is heated by at least two heating lines (9, 9', 9") each forming a secondary of one same transformer (3a, 3b and 3c).
  2. Heating installation according to claim 1, characterized in that the transformer (3a, 3b and 3c) is of toroidal type, its secondary winding (7) being in a metal of lower conductivity than the conductivity of the heating lines (9, 9', 9").
  3. Installation according to claim 2, characterized in that the secondary winding (7) is made in copper and the heating lines (9, 9', 9") in aluminium.
  4. Installation according to claim 3, characterized in that the diameters of the secondary winding (7) and of the heating lines (9, 9', 9") are substantially identical.
  5. Installation according to any of the preceding claims, characterized in that the transformers (3a, 3b and 3c) are arranged in immediate vicinity of the ground.
  6. Installation according to claim 5, characterized in that the transformers (3a, 3b and 3c) are arranged in a technical gallery (16) buried in the ground.
  7. Installation according to any of the preceding claims, characterized in that the primary winding (5) of the transformers (3a, 3b and 3c) comprises a shield consisting of a metal strip (22).
  8. Installation according to claim 7, characterized in that the shield consists of aluminium or copper.
  9. Installation according to any of the preceding claims, characterized in that the cable forming the secondary winding of the transformer is made of two conductor elements twisted over each other.
  10. Installation according to any of the preceding claims, characterized in that the no-load voltage of the secondary of the transformer (3a, 3b and 3c) is in the order of 50 volts.
  11. Installation according to any of the preceding claims, characterized in that the magnetic circuit of the transformer is insulated, in particular by means of a resin.
EP05798611A 2004-08-26 2005-08-24 Device for heating grounds, in particular sports grounds Active EP1782659B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05798611T PL1782659T3 (en) 2004-08-26 2005-08-24 Device for heating grounds, in particular sports grounds

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0409107A FR2874782B1 (en) 2004-08-26 2004-08-26 DEVICE FOR HEATING FIELDS, IN PARTICULAR SPORTS
PCT/FR2005/002131 WO2006024797A1 (en) 2004-08-26 2005-08-24 Device for heating grounds, in particular sports ground

Publications (2)

Publication Number Publication Date
EP1782659A1 EP1782659A1 (en) 2007-05-09
EP1782659B1 true EP1782659B1 (en) 2008-05-14

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EP05798611A Active EP1782659B1 (en) 2004-08-26 2005-08-24 Device for heating grounds, in particular sports grounds

Country Status (15)

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US (1) US7778532B2 (en)
EP (1) EP1782659B1 (en)
JP (1) JP4721462B2 (en)
KR (1) KR20070065335A (en)
CN (1) CN101010988B (en)
AT (1) ATE395803T1 (en)
CA (1) CA2578116C (en)
DE (1) DE602005006817D1 (en)
FR (1) FR2874782B1 (en)
NO (1) NO339053B1 (en)
NZ (1) NZ553956A (en)
PL (1) PL1782659T3 (en)
RU (1) RU2355132C2 (en)
UA (1) UA89197C2 (en)
WO (1) WO2006024797A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2965899B1 (en) * 2010-10-08 2015-01-16 Ilo Technology HEATED FILM WITH ELECTRICAL CONNECTION POWERED BY THREE PHASE
JP2013034081A (en) 2011-08-02 2013-02-14 Sony Corp Image processing device, control method therefor, and program

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DE3603233A1 (en) * 1986-02-03 1987-08-06 Buchtal Gmbh COATING FOR WALL, CEILING OR FLOOR CLOTHING
JPS6448903A (en) * 1987-08-14 1989-02-23 Mitsubishi Cable Ind Ltd Load heating control method
EP0517929B1 (en) 1991-06-01 1995-03-15 Heraeus Noblelight GmbH Irradiation device with a high power radiator
JPH05171610A (en) * 1991-12-24 1993-07-09 Fujii:Kk Road heater and controlling thereof
WO1993019565A1 (en) * 1992-03-20 1993-09-30 Eolas - The Irish Science And Technology Agency An induction panel heater
JP3442114B2 (en) * 1993-08-26 2003-09-02 昭和電線電纜株式会社 Road heating control device
JP3536935B2 (en) * 1994-07-21 2004-06-14 大日本インキ化学工業株式会社 Heating element for stair melting
JP2973918B2 (en) * 1995-12-26 1999-11-08 鹿島建設株式会社 Construction method of laying a heater and a heater tube for heating and cooling on the existing ground of natural turf
JPH09308695A (en) * 1996-05-24 1997-12-02 Yoshinori Yamamoto Vital waveform type energy utilizing device
CA2177726C (en) * 1996-05-29 2000-06-27 Theodore Wildi Low-voltage and low flux density heating system
CA2179677C (en) * 1996-06-21 2000-07-11 Theodore Wildi Extra-low-voltage heating system
JP2000088889A (en) * 1998-09-10 2000-03-31 Tokin Corp Current transformer and device using the same
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JP3805946B2 (en) * 2000-05-23 2006-08-09 独立行政法人科学技術振興機構 Superconducting cable power transmission device and drift prevention method using the same
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JP3953893B2 (en) * 2002-06-14 2007-08-08 株式会社ティーネットジャパン Freezing prevention pavement method
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JP2004134707A (en) * 2002-10-15 2004-04-30 Hitachi Industrial Equipment Systems Co Ltd Resin mold coil, mold transformer using the same, and method for manufacturing the mold transformer
JP3637046B2 (en) * 2002-11-28 2005-04-06 良明 ▲たか▼橋 Conductive wire

Also Published As

Publication number Publication date
PL1782659T3 (en) 2008-10-31
NO339053B1 (en) 2016-11-07
CN101010988B (en) 2011-09-14
FR2874782A1 (en) 2006-03-03
ATE395803T1 (en) 2008-05-15
NO20071554L (en) 2007-05-14
CN101010988A (en) 2007-08-01
WO2006024797A1 (en) 2006-03-09
US20070269193A1 (en) 2007-11-22
JP2008510908A (en) 2008-04-10
UA89197C2 (en) 2010-01-11
FR2874782B1 (en) 2006-12-08
CA2578116A1 (en) 2006-03-09
KR20070065335A (en) 2007-06-22
CA2578116C (en) 2014-12-30
JP4721462B2 (en) 2011-07-13
EP1782659A1 (en) 2007-05-09
RU2355132C2 (en) 2009-05-10
RU2007107921A (en) 2008-10-10
NZ553956A (en) 2009-07-31
DE602005006817D1 (en) 2008-06-26
US7778532B2 (en) 2010-08-17

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