RU109545U1 - PRESSED HEAT EXCHANGE PROFILE - Google Patents

Abstract

 A pressed heat-exchange profile containing a pipe for the passage of coolant and a heat-dissipating element made in the form of two longitudinal walls located on opposite sides of the pipe, and longitudinal plates radially located between the walls, two of which form a closed air channel with each longitudinal wall throughout walls, characterized in that the longitudinal walls are made: for the oncoming flow of the air coolant flat, and for the outflowing stream in the form of a concave arc, a combination of such The shape of the longitudinal walls creates the conditions for the transition of a part of the laminar motion of the incoming horizontal flow of air coolant to the heat exchange profile into the outgoing vertical turbulent component of the flow around the profile, 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 of R = 2.8 ÷ 4.3 ∙ D, mm, where D is the length of the chord of a concave arc, mm.

Description

The utility model relates to heat exchangers and can be used for heating and cooling systems.

Many forms of heat exchange elements are known [1-4]. Such heat exchange elements contain a convex, concave or flat surface, which allows heat to be dispersed in the nearest heating zone in a uniform layer. However, for systems with forced movement of the air coolant, local zones created in the surrounding space with vertical orientation of turbulent flows and preventing the air heat carrier from flowing through the heat transfer profiles of the horizontal laminar component of the flow passing into the vertical turbulent component reduce the heat transfer effect.

A heat exchange profile containing a pipe for the passage of coolant and a heat dissipating element made in the form of two longitudinal walls located on opposite sides of the pipe parallel to each other and longitudinal plates radially located between the walls, two of which form channels with the walls (RF Patent Utility Model 36725, publ. March 20, 2004).

This design is also not effective enough, since the longitudinal frontal screens create weak vertical turbulization and impede the advancement of horizontal fresh air flows of the coolant with their transition to the vertical component.

The closest technical solution is a heating radiator-convector with its heating elements made concave towards the shape pipe, with the possibility of focusing infrared radiation (RF Patent for utility model 68668, published on November 27, 2007).

This technical solution is also not sufficiently effective due to the presence of a low turbulization screen and aerodynamic resistance to the promotion of horizontal fresh air flows of the coolant with its transition to the vertical component.

The claimed technical solution is aimed at creating a heat transfer effect with significant permeability of the horizontal component of the air flow and transferring part of the laminar motion of the incoming horizontal flow of air to the heat transfer profile into the outgoing vertical turbulent flow component around the profile made of aluminum alloy by cold pressing.

This solution is achieved by the fact that the extruded heat exchange profile containing a pipe for the passage of coolant and a heat dissipating element made in the form of two longitudinal walls located on opposite sides of the pipe, and longitudinal plates radially spaced between the walls, two of which form a closed wall with each longitudinal wall the air channel along the entire length of the wall, and the longitudinal walls are made for the oncoming flow of the air coolant flat, and for the outgoing flow of a concave arc, I of such forms of longitudinal walls creates the conditions for the transition of part of the laminar motion of the incoming horizontal flow of air coolant to the heat exchange profile into the outgoing vertical turbulent component of the flow around the profile, which has 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 of a concave arc, mm.

In FIG. Shows a general view of the "Pressed heat transfer profile."

The pressed heat-exchange profile device comprises a pipe 1 for passage of a heat carrier, a heat-dissipating element in the form of two longitudinal walls in the form of a flat 2 for the oncoming flow of the air coolant, and in the form of a concave arc 3 for the outgoing flow of the air coolant, radial longitudinal plates between the walls 4, the aerodynamic radius 5 of the flat wall for oncoming flow, incoming horizontal forced or natural flow of air coolant 6, region of vertical turbulent flow of a stuffy coolant 7 inside the profile, the outgoing vertical turbulent component of the air coolant flow 8, the outgoing horizontal component of the air coolant flow 9, the laminar horizontal component of the air coolant flow 10, the turbulization region of the longitudinal flat wall 11 with a longitudinal recess 12 located symmetrically to the axis, a local reinforced zone of upward flow 13 due to the geometry of the longitudinal walls.

An example of the functioning of a pressed heat exchange profile is as follows. The coolant passing through the pipe 1 transfers heat to the heat-dissipating element in the form of two longitudinal walls in the form of a flat 2 for the oncoming flow of the air coolant, concave 3 and radial longitudinal plates 4 located between the walls. The incoming horizontal forced or natural air flow 6 flows around the turbulization region 11 of the longitudinal flat wall and the vertical turbulent air flow 7 inside the profile, created by the vertical warm flow of the heat exchange process and an aerodynamic radius 5 enhancing the turbulization process inside the profile of the radial longitudinal plates 4, which transfer heat laminar horizontal component of the air coolant 10 streamlined stream through penetration Ia in its structure, guided in vertical turbulent zone outgoing air coolant flow component 8 and a zone outgoing horizontal flow component 9.

Turbulence is a vortex mixing of constantly moving and mixed air flows. (Mining: Terminological Dictionary / G.D. Lidin, L.D. Voronina, D.R. Kaplunov and others - 4th ed., Perab. And add. - M .: Nedra, 1980. - p. 173.)

With a decrease in the radius of the concave arc of the profile wall, the heat transfer process in this section behind the profile will increase to the value of the profile bounding the metal. The distance between the radial longitudinal plates and the longitudinal walls will decrease, and the heat exchange process of the vertical turbulent component of the air flow in the channel between them will be reduced.

With an increase in the radius of the concave arc of the longitudinal wall of the heat transfer profile, the speed of the outgoing vertical turbulent component of the air flow will decrease and will turn into a horizontal laminar flow. The resistance of the outgoing air flow will increase due to a decrease in the outgoing vertical turbulent component of the flow. The streamlining of the heat transfer profile will decrease, and the heat transfer process will decrease.

A change in the radius of the concave arc of the longitudinal walls with a constant length of the chord of the arc and constant weight of the running meter of the pressed heat exchange profile leads to a change in the heat transfer of the heat-dissipating element (see table). In the claimed interval, "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 of the concave arc, mm" translated linear values 238-365.5 mm heat transfer per meter profile in W / kg varies slightly, and outside this interval the heat transfer drops sharply.

Information sources

1. Patent RU No. 2137053, IPC F24H 3/08, F28F 1/02, F28F 1/40. Date of publication 10.09.1999.

2. Patent RU No. 2122161, IPC F24H 3/08, F24H 3/12. Publication date 11/20/1998.

3. Patent RU No. 2059533, IPC F24D 3/12, F24D 19/00, F28F 1/10. Publication date 05/10/1996.

4. Patent RU No. 91756, IPC F28F 1/10. Date of publication 02.27.2010.

5. Patent RU No. 36725, IPC F28F 1/10. Publication date 03/20/2004.

6. Patent No. 68668, IPC F28F 1/10. Publication date 11/27/2008 (prototype).

Table The radius of the concave arc, mm 390 375 360 345 330 315 300 285 270 255 240 225 210 Arc chord length, mm 85 85 85 85 85 85 85 85 85 85 85 85 85 Weight per meter of profile, kg / m 1,186 1,186 1,186 1,186 1,186 1,186 1,186 1,186 1,186 1,186 1,186 1,186 1,186 Heat transfer per meter of the profile, W / kg 355 376 397 403 409 415 420 414 408 402 396 374 352

Claims (1)

A pressed heat-exchange profile containing a pipe for the passage of coolant and a heat-dissipating element made in the form of two longitudinal walls located on opposite sides of the pipe, and longitudinal plates radially located between the walls, two of which form a closed air channel with each longitudinal wall throughout walls, characterized in that the longitudinal walls are made: for the oncoming flow of the air coolant flat, and for the outflowing stream in the form of a concave arc, a combination of such The shape of the longitudinal walls creates the conditions for the transition of a part of the laminar motion of the incoming horizontal flow of air coolant to the heat exchange profile into the outgoing vertical turbulent component of the flow around the profile, which has local reinforced zones of upward flow due to the geometry of the longitudinal walls, the concave arc of the longitudinal wall is bent with a radius of R = 2.8 ÷ 4.3 ∙ D, mm, where D is the length of the chord of a concave arc, mm.