EP4036491A1

EP4036491A1 - Convector profile

Info

Publication number: EP4036491A1
Application number: EP20942435.7A
Authority: EP
Inventors: Sergei Dmitrievich GUBIN
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-09
Filing date: 2020-12-30
Publication date: 2022-08-03
Also published as: EP4036491A4; CN114945779A; RU2752444C1; WO2022124929A1

Abstract

The invention relates to the field of heating of industrial and civil buildings and facilities, in particular to a convector profile. A convector profile comprises a tube for the passage of a heat transfer medium, external heat exchange panels and a T-shaped fin defined by an upper and lower shelfs disposed therebetween, and horizontal fins provided with through holes, wherein the convector profile is made of aluminum or aluminum alloys, the external heat exchange panels are disposed at an angle to the internal cavity, the tube has a finned internal surface and is connected to a vertical fin diametrically disposed to the T-shaped rib, wherein the through holes in the horizontal fins are made of a rectangular shape. The technical result is to increase the intensity of heat exchange, simplify the design and reduce overall dimensions, increase reliability, manufacturability and corrosion resistance.

Description

Field of invention

The invention relates to the field of heating of industrial and civil buildings and facilities, in particular to a convector profile.

Background of invention

The purpose of a heating apparatus is to transfer heat from a heat transfer medium to the air environment within a room. In terms of the heat transfer method, heating apparatuses are conditionally divided into radiators and convectors.
Radiators transfer heat both by radiation and by convection. Their disadvantage is a large size, low operating pressure (up to 6 bar), a large volume of heat transfer medium and heating of nearby objects.
Convectors transmit heat generally by convection. Furthermore, they require a smaller volume of the heat transfer medium to be filled in the system. The convectors are structurally configured to withstand a higher pressure in the network (up to 30 bar).
The most common design of the convector is a tube with fins pressed thereon and has such disadvantages as unaesthetic appearance, contamination of the inter-fin space.
Known are profiles made of aluminum alloy by cold molding ( Russian utility model patents Nos. 109545 and 109546 , IPC F28F 1/10) comprising a tube for the passage of a heat transfer medium and a heat-dissipating element configured as two longitudinal walls disposed on opposite sides of the tube, and longitudinal plates disposed radially between the walls, each of the two of which plates form a closed air channel with each longitudinal wall along the entire length of the wall, wherein the longitudinal walls are made flat for the in-flow of the air heat transfer medium and made as a concave arch for the out-flow, the combination of such shapes of longitudinal walls provides conditions for the transfer of a portion of the laminar movement of the horizontal in-flow of the air heat transfer medium to the heat exchange profile into the outgoing vertical turbulent component of the flow around the profile, said outgoing vertical turbulent component of the flow having local reinforced zones of the upward flow due to the geometry of the longitudinal walls, the concave arc of the longitudinal wall is bent with a radius R=2.8÷4.3·D, mm, where D is the length of the chord.
The above profile designs in said patents have low efficiency, since the passage of horizontal/vertical (from top to bottom) air flow requires forced blowing of the profile. The profile itself does not produce natural air convection but is only designed such that the turbulent flows are swirled, thus providing heat/cold transfer from the tube, the tube being filled with a heat transfer medium, to the air flow passing by. Such design is suitable for a duct heater/refrigerant provided that an electric fan is installed, i.e. a calorifier/refrigeration unit/air conditioner. The apparatuses of this type are installed at industrial facilities.
The prior art provides a sectional radiator made of extruded aluminum profiles (RF patent No. 2254521, IPC F24H 3/00, published on 20.06.2005), comprising inlet and outlet collectors made in the form of an asymmetric profile tube with a displaced channel and paired lugs, secured by screws, on the side of the support surface, connected thereto vertical tubular axisymmetric sections with axial radial fins, rear and front external panels, wherein each collector is made with a displaced channel of a "beak-shaped" configuration in cross-section and provided with a thickened trapezoidal support, the axisymmetrically arranged tubular channel of the section is a tube with vertical heat-dissipating fins configured as radial-axial fins, and intermediate symmetrically curved fins, on both sides of the section along the axial edge at a length equal to the thickness of the transverse side of the collector profile there is press-fitted a smooth tube with two annular grooves into the installation holes of the collectors, in said grooves there are disposed sealing rings, the axial fin at both ends of the channels is provided with an elastic heat-resistant locking member; further, the radiator has mounting sections, the fastening of the rear panel of the mounting section to the thickened side of the collectors being provided mainly with self-tapping bolts that act as radiator's rigid bracing, said self-tapping bolts being screwed through the mounting holes. Extruded aluminum profiles are preferably made of aluminum alloys, for example, an alloy consisting of the following components: 0.59% of Mg, 0.39% of Si, 0.19% of Fe, 0.3% of Cu, 98.53% of aluminum
The given model consists of many elements that require installation skills and are difficult to manufacture. The efficiency of thermal transfer may be reduced when the entire structure is installed imporperly and when the modulus of rigidity of the heat transfer medium (saturation with minerals) is high; internal connections may get stuck due to rust or corrosion, which fact means that corrosion, clogging of channels, loss of tightness can likely take place.
The prior art provides a convector section ( Russian utility model patent No. 61397 , IPC F24H 3/06, published on 27.02.2007), comprising a heat exchange element having longitudinal side panels on the upper side, said longitudinal side panels extending into perpendicular thereto sections inwardly to the section to form a longitudinal gap and fins disposed between the side panels to increase the heat transfer area, said fins having a main fin and additional fin, said additional fin having a T-shaped profile, the horizontal component of which T-shaped profile extends along the longitudinal gap with a gap such that a clearance is provided relative to the internal surfaces of the shelves perpendicular to the side panels, characterized in that the section has at least two collectors for the passage of the heat transfer medium through the section, said collectors being disposed at the lower base of the side panels from their inner side and mating thereto, the main rib is disposed along the longitudinal axes of the collectors, connects same and is mated therewith, wherein through holes are provided along the entire length of the main rib, the vertical component of the T-shaped profile of the additional rib is connected to the main rib along the longitudinal axis thereof, and the horizontal component is parallel thereto.
The above convector has two collector channels in the main profile. The design is cumbersome, since it contains a complex assembly for connecting profiles to the general heating system, through an original support leg. The disadvantage of the design is that the support leg performs the role of a bearing element and at the same time the function of a looped collector, which may be very unreliable in use. Also, the design allows only a floor-mounted design.
As the closest analogue, the authors selected a convector for a water heating system and a convector section ( Russing utility model patent No. 53759 , IPC F24H 3/06, published on 27.05.2006) comprising at least two sections, each of which sections has a collector for the passage of the heat transfer medium through the section and a heat exchange element having side panels, and disposed therebetween fins to increase the heat transfer area, installation elements, wherein the side panels are disposed along the longitudinal axis of the collector for the passage of the heat transfer medium through the section, the collector outlet of each previous section is connected to the collector inlet of the next section by a connecting collector.
The above convector is a solid structure, which is obtained from a profile by cutting off the external and internal ribs. The central element of the profile (collector), after removing the ribs, is bent at an angle so as to form two parallel profiles. With the integral convector design, the support leg on the side of the protruding element (collector) results to be composite (i.e. consisting of several elements bolted to each other). The design is difficult to manufacture. Furthermore, the possibility of microcracks of the bent element (collector) is not excluded, which fact may lead to unreliability of the design and a decrease in operational characteristics, in particular, a decrease in the resistance to the pressure of the heat transfer medium, expansion of microcracks as a result of a temperature drop, a decrease in corrosion resistance. The selected method for the looping of the convector also limits possible parallel arrangement of the profiles and excludes the possibility of repair and simple replacement of a convector section.

Disclosure of Invention

The technical task of the invention is to create an easy-to-manufacture aluminum convector.
The technical result is to increase the intensity of heat exchange, simplify the design and reduce overall dimensions, increase reliability, manufacturability and corrosion resistance.
The technical result is achieved by the fact that the convector profile includes a tube for the passage of a heat transfer medium, external heat exchange panels and a T-shaped fin defined by an upper and lower shelfs disposed therebetween, and horizontal fins provided with through holes, wherein the convector profile is made of aluminum or aluminum alloys, the external heat exchange panels are disposed at an angle to the internal cavity, the tube has a finned internal surface and is connected to a vertical fin diametrically disposed to the T-shaped rib, wherein the through holes in the horizontal fins are made of a rectangular shape.

Brief description of drawings:

Fig. 1 is the convector profile.
Fig. 2 is the convector section.

The convector profile 1 (Fig.1) made by extrusion from aluminum or aluminum alloys in the form of a single part, comprising a tube 2 for the passage of a heat transfer medium (water). The tube 2 (Fig. 1, 2) has a finned internal surface to increase the contact surface with the heat transfer medium. On the sides of the tube 2 there are symmetrically extended horizontal fins 3 disposed in a plane passing through the longitudinal axis of the collector, said horizontal fins 3 connecting the tube 2 with external heat exchange panels 4. The horizontal fins 3 provide for an increased heat transfer area. Further, through rectangular holes 5 (Fig. 2) are provided at a predetermined distance from each other along the entire length of the horizontal fins 3, the through rectangular holes providing air movement.
The external heat exchange panels 4 are disposed along the longitudinal axis of the tube 2 and are defined by straight 6 and inclined 7 sections. Further, the straight sections 6 protrude downwards beyond the tube 2 perpendicularly to the horizontal fins 3, and the inclined sections 7 of the external heat exchange panels 4 are provided at an angle of inclination towards the inner cavity of the profile of 7-15° to increase the flow rate of heated air at the outlet of the convector. The inclined sections 7 in the upper portion are rounded into the inside of the profile and extend to the perpendicular thereto shelves 8 to form a longitudinal gap. The external heat exchange panels 4 also have technological thickenings 9 provided on straight 6 and inclined 7 sections to increase the strength of the structure.
To increase the heat transfer area, a T-shaped fin 10 and a vertical fin 11 are provided along the entire length of the tube 2 along the axis thereof.
The T-shaped fin 10 extends along the upper portion of the tube 2 along the entire length thereof and is defined by the upper 12 and lower 13 shelves. Further, the upper shelf 12 is configured horizontal and extends under the longitudinal gap defined by the shelves 8 of the external heat exchange panels 4 such that the width of the upper shelf 12 exceeds that of the longitudinal gap to protect the inner surface of the convector from the penetration of foreign objects. The lower shelf 13 of the T-shaped fin 10 is provided with a technological thickening 14 to increase the strength of the structure.
When heating the heat transfer medium (water) in the tube 2, the air entering the inner cavity of the convector defined by the horizontal fins 3, external heat exchange panels 4, T-shaped fin 10 and vertical fin 11 is heated. Next, the heated air passes through the gap defined by the shelves 8 and the upper shelf 12 of the T-shaped fin 10. By configuring the external heat exchange panels 4 inclined with respect to the horizontal fins 3, increased flow rate of heated air at the outlet of the convector is provided, and the T-shaped fin 10 protects the inner surface of the convector from the penetration of foreign objects.
The absence of copper and silicon in the convector structure makes it possible to increase the corrosion resistance.
The claimed design of the convector provides an increase in thermal power by 100 W/m as compared to that of the closest analogue and the achievement of a technological efficiency equal to 113 W/kg.

Claims

A convector profile comprising a tube for the passage of a heat transfer medium, external heat exchange panels and a T-shaped fin defined by an upper and lower shelfs disposed therebetween, and horizontal fins provided with through holes, characterized in that the convector profile is made of aluminum or aluminum alloys, the external heat exchange panels are disposed at an angle to the internal cavity, the tube has a finned internal surface and is connected to a vertical fin diametrically disposed to the T-shaped rib, wherein the through holes in the horizontal fins are made of a rectangular shape.
The convector profile according to claim 1, characterized in that the external heat exchange panels 4 are provided at an angle of inclination towards the inner cavity of the section of 7-15°.
The convector profile according to claim 1, characterized in that the lower shelf of the T-shaped fin is provided with a technological thickening
The convector profile according to claim 1, characterized in that the tube is made with longitudinal finning along the entire length thereof.