FR2529309A1 - WATER-AIR CONVECTOR WITH CHIMNEY EFFECT TO HEAT A LOCAL - Google Patents

Abstract

WATER-AIR CONVECTOR WITH CHIMNEY EFFECT TO HEAT A ROOM. A HEAT EXCHANGER IS CONSTITUTED BY CONCENTRIC SLEEVES M1, M2 EACH SHAPED BY THREE HELICAL TURNS OF A T1 TUBE EQUIPPED WITH TWO A1, B1 VERTICAL AND LONGITUDINAL SLEEVES, AND CONSTITUTES OF A THERMALLY LOADED PLASTIC MATERIAL THIS CONDUCTOR, SHAPED BY EXTRUSION OF THE TUBE WITH ITS FINS, THEN BENDING. APPLICATION TO DOMESTIC HEATING.

Description

1-_ Water-air convector with a chimney effect to heat a room

  The invention relates to a water-air convector with a chimney effect

to heat a room.

  It is known that the so-called "central heating" installations for space heating comprise, in each room, a heat exchanger.

  heat of the radiator or convector type, the convector being, by way of

  radiator, characterized by the fact that almost all of the

  heat is vented to the room by air convection.

  It is known to produce the water-air convectors using steel sheets constituting, on the one hand, hot water pipes and, on the other hand, fins which are heated by these pipes by thermal conduction in the metal and which transmit heat efficiently to the air thanks to their large contact surface with it It is also known that this heat transmission is made more active thanks to the rate of rise of the heated air in contact with these fins, and that this speed can be increased by chimney effect, that is to say by channeling the air in a vertical chimney around and

above the fins.

  These conventional convectors have the disadvantage of being

  expensive because their manufacture requires a high energy expenditure, many welds, bends, assemblies etc and require some maintenance (painting) to protect them against

  rust, which is why it was proposed in the patent document-

  FR-A No. 2,478,27, a water-air convector with a chimney effect, comprising

  both: hot water pipes, heat exchange surfaces in thermal contact with these pipes

  and a chimney whose walls are arranged substantially vertically

  around and above these heat exchange surfaces to channel and accelerate the upward circulation of heated air in contact with these surfaces, so as to accelerate the heat exchange between these surfaces and the air flowing on contact with them. , this known convector being characterized by the fact that these pipes and these exchange surfaces

  are internal channel plates, the material

2-

  these plates being an extrudable organic high polymer comprising

  as a thermally conductive charge.

  These internal channel plates may have the shape of

  vertical channels whose channels are horizontal and protrude on both sides of the plate The arrangement using channels allows to have a sufficient water speed for a good heat exchange with water Its realization is quite easy The fact that the channels are horizontal tends to cause a detachment of the boundary layer at each

  passage of rising air at the level of a channel.

  However, it appeared that the price of

comes back from the convector.

  The present invention aims to further increase the ease of realization of a water-air convector chimney effect to heat a room, maintaining a good heat transfer efficiency, and

  without imposing any particular maintenance of the convector.

  It relates to a water-to-air convector with a chimney effect for heating a room, this convector comprising: a succession of parallel vertical heating panels circulating between them ascending air blades, these panels extending in a longitudinal horizontal direction , succeeding in a transverse horizontal direction, consisting of an extrudable organic high polymer provided with a thermally conductive filler, and each having vertical heat exchange surfaces, a vertical succession of longitudinal tubes traversed by hot water formed by walls in continuity of material with these exchange surfaces protruding on these surfaces,

  and a chimney whose walls are arranged substantially vertically

  around and above these heat exchange surfaces to channel and accelerate the upward circulation of heated air in contact with these surfaces, so as to increase the heat exchange between these surfaces and the air circulating on contact with them. , this convector being characterized in that said tubes and heat exchange surfaces are constituted by sleeves each having a longitudinal front face and a rear face 3 -

  constituting said panels and two vertical lateral faces incur-

  These connecting sleeves surrounding each other, forming a radial succession from a central volume, each of these sleeves being constituted by a tube carrying fins and wound in a helix and making several times the turn of the sleeve and in

  one stage at each turn, these fins being vertical

  both of them according to the length of this tube, and being two in number one in the upper position the other in the lower position these two

  fins occupying at least 80% of the vertical interval between two

  same two-stage tube, so as to constitute

  said heat exchange surfaces in the form of a vertical wall

hold substantially continuous.

  In addition, preferably according to the circumstances, the following provisions are adopted: the two fins of the tube are, one wide and the other narrow, the successive sleeves being alternately constituted by a tube whose narrow fin is, in the lower position and in the upper position, so as to allow both to vertically shift the tubes of the successive sleeves to avoid excessive shrinkage of the upward air gap, and to support the lower portions of these successive sleeves on the same support extending horizontally from the central volume The thickness of the fins is substantially equal to that

of the tube wall.

  Another subject of the present invention is a method of manufacturing

  This process is characterized in that the tube is manufactured continuously with its fins by a single extrusion operation, then cut into sections, then bent hot for

make the sleeves.

  With the aid of the attached schematic figures, we will describe below, in a non-limiting way, how the invention can be implemented. It should be understood that the elements described and represented can, without departing from the scope of the invention, to be replaced by other elements providing the same technical functions When the same element is represented in several figures it is designated by the

same reference sign.

  FIG. 1 represents an overall perspective view of a

convector according to the invention.

  FIG. 2 represents a cutaway perspective view of this convection

  without its stacker.

  Figure 3 shows a sectional view of several sleeves of this convector. FIG. 4 represents an enlarged perspective view of one of the equidistant vertical spacers constituting spacers.

  for the circulation of air between the successive sleeves of this convection.

tor.

  The convector which is represented in FIG. 1, comprises a rectangular box t with vertical walls carried by four feet 2 and constituting a chimney 4 with a rectangular section 20 cm wide and

  75 cm high with a perforated lid 6.

  In the chimney, at the bottom of it, are arranged nine concentric vertical sleeves constituting a heat exchanger 8 fed with

  hot water by a high inlet 10, the outlet 12 being at the bottom.

  The distribution of the hot water flow in parallel in the nine vertical sleeves is performed in an inlet manifold 20 located at the upper part of the heat exchanger, fed by the inlet

high 10.

  Similarly, an outlet manifold 22 located at the lower part of the heat exchanger includes the parallel water flows from the

  nine vertical sleeves, evacuated through exit 12.

  The flow of air is represented by the arrows 16 It starts from the perforated bottom 14 of the box air heated by the exchanger

  rises in the chimney and leaves by the cover 6.

  The material of this exchanger may be a mixture of high density polyethylene with 40% by weight of chlorinated polyethylene, the latter comprising 35% of chlorine by weight with 2 to 2.5% of a conventional antioxidant (mixture of alkylated polyphenols and thiodipropionates) and a conventional coupling agent (1% of an organic titanate). The feed consists of 80% by weight of a mixture of carbon black with 10%

  of carbon fibers 1 to 3 mm long for a diameter of 8 micrometers.

  Such a material can be shaped by extrusion and receive

  later hot limited deformations.

  - The heat exchanger 8 comprises as known a succession of parallel vertical heating panels circulating between them rising air blades, these panels extending in a longitudinal horizontal direction, succeeding in a transverse horizontal direction, consisting of an extrudable organic high polymer provided with a thermally conductive filler, and each comprising: vertical heat exchange surfaces, a vertical succession of longitudinal tubes traversed by hot water, formed by walls in continuity of material with these surfaces; exchange forming protruding on these surfaces,

  and a chimney whose walls are arranged substantially vertical-

  around and above these heat exchange surfaces for

  to read and accelerate the upward circulation of heated air in contact with these surfaces, so as to increase the heat exchange

  between these surfaces and the air circulating at their contact.

  According to the invention and as shown in FIGS. 2 and 3, said tubes and heat exchange surfaces are constituted by sleeves each having a vertical front face and a rear face.

  longitudinal sections constituting said panels and two lateral faces

  curved ticales connecting these front and rear faces, these sleeves surrounding each other forming a radial succession from a central volume each of these sleeves being constituted by a tube (Tl, T 2) carrying fins and wound in a helix and making several turns around the sleeve and going up one stage at each turn, these fins being vertical both extending along the length of this tube, and being two in number one in the upper position ( Bi, B 2), the other in the lower position (Al, B 2) these two fins occupying at least 80% of the vertical gap between two sections (Tla, Tlb) of the same tube (Tl) with two adjacent stages, so as to constitute said heat exchange surfaces in the form of a substantially continuous vertical wall. Preferably, the two fins of the tube (Tl, T 2) are one wide (Bi, B 2) and the other narrow (Al, A 2), the successive sleeves (Ml, M 2) being alternately constituted by a tube (Tl, T 2) whose fin

  (Ai, A 2) is in the lower position (Ai) and in the upper position

  (A 2), so as to both vertically shift the tubes of the successive sleeves to prevent excessive shrinkage of the upward air gap, and to support the lower parts of

  these successive sleeves on the same support (20) extending horizontally

  from the central volume (18).

  The difference in width between the narrow fins A 1, A 2 and the wide fins Bi, B 2 is chosen so that the passage section offered to the air between two adjacent tubes T 1, T 2 is not less than that offered between a tube T1 and the fin B 2, the sleeve next to this tube This difference must however remain sufficiently

  small so that the heat of the tube can easily reach the end of the

mite of the wide fin.

  More preferably, the thickness of the fins is substantially

  equal to that of the wall of the tube.

  Such an exchanger can be manufactured in a particularly simple manner. When the tube provided with two fins is bent hot to form one of the turns of a sleeve, the resulting deformation of the fins constitutes cylindrical surface elements of vertical axis, so that the ends of the fins of 2 turns of the same sleeve remain in vis-à-vis, ensuring the continuity of the

wall of exchanges with the air.

  The introduction of each turn of a sleeve is effected by resting on a set of equidistant vertical spacers constituting spacers between the sleeves; these spacers are represented on

  Figure 4; they are arranged parallel to the veins of circulating air.

  vertically between the sleeves; these spacers ensure a

  regular distribution of air velocity and heat exchange.

  The parallel distribution of the flow of water between the various man-

  chons has the effect of: maintaining the temperature equality in the turns facing the various sleeves, constituting a regular arrangement of the tubes remaining equidistant throughout the exchanger, 7- adequately limiting the speed of water circulation and loss

charge.

  In the particular embodiment shown, the number of concentric sleeves is nine. The wall of the tube is 0.8 mm thick, as are the fins. The tube, with its two fins, has a height of 21.6 mm. complete turns in each sleeve The distance between two fins opposite two adjacent sleeves is 7 mm Vertical struts E (see Figures 3 and 4) ensure the maintenance of the positions of the sleeves while leaving the air

move vertically.

8 -

Claims (3)

  1 / Water-air convector with a chimney effect for heating a room, this convector comprising a succession of parallel vertical heating panels allowing ascending air to circulate between them, these panels extending in a longitudinal horizontal direction, succeeding one another according to a transverse horizontal direction, consisting of an extrudable organic high polymer provided with a thermally conductive filler, and each having vertical heat exchange surfaces, a vertical succession of longitudinal tubes traversed by hot water, formed by walls in continuity of material with these exchange surfaces projecting on these surfaces,   and a chimney whose walls are arranged substantially vertically   around and above these heat exchange surfaces to channel and accelerate the upward circulation of heated air in contact with these surfaces, so as to increase the heat exchange between these surfaces and the air circulating on contact with them. , this convector being characterized in that said tubes and heat exchange surfaces are constituted by sleeves (Ml, M 2, M 3) each having a front face (Mia) and a rear face (Mir) vertical longitudinal constituting said panels and two curved vertical lateral faces (Mil) connecting these front and rear faces, these sleeves surrounding each other forming a radial succession from a central volume (18) each of these sleeves being constituted by a tube (Tl, T 2) carrying fins and wound helically and several times around the sleeve and going up one stage at each turn, these fins being vertical, both extending the length of this tube, and being two in number, one in the upper position (Bl, B 2), the other in the lower position (Ai, B 2) these two fins occupying at least 80% of the vertical gap between two sections (Tla, Tlb) of the same tube (Tl) with two adjacent stages, so as to constitute said heat exchange surfaces in the form of a vertical wall substantially keep on going.   9/2 / convector according to claim 1, characterized in that the two fins of the tube (Tl, T 2) are, one wide (Bi, B 2) and the other narrow (Ai, A 2) the successive sleeves (Ml, M 2) being alternately constituted by a tube (Tl, T 2) whose narrow fin (Ai, A 2) is, in the lower position (Ai) and in the upper position (A 2), so to allow both to vertically shift the tubes of successive sleeves to avoid excessive shrinkage of the air gap   ascending, and supporting the lower parts of these suc-   on the same support (20) extending horizontally from the central volume (18).   3 / Convector according to claim 1, characterized in that the thickness of the fins (Ai, Bi) is substantially equal to that of the wall of the tube (Tl).   4 / A method of manufacturing a convector according to claim 1, this method being characterized in that the tube (Tl, T 2) is manufactured continuously with its fins (Ai, Bi, A 2, B 2) by a only extrusion operation, then cut into sections (Tl, T 2), then bent hot   to form the sleeves (Ml, M 2).