WO2012154071A1

WO2012154071A1 - Heat exchanger

Info

Publication number: WO2012154071A1
Application number: PCT/RU2011/000311
Authority: WO
Inventors: Aleksei Borisovich VELICHKO; Timofei Borisovich VELICHKO
Original assignee: Velichko Aleksei Borisovich; Velichko Timofei Borisovich
Priority date: 2011-05-06
Filing date: 2011-05-06
Publication date: 2012-11-15

Abstract

Heat exchanger includes panel made of a heat-conducting material, side of which is intended for contact with a heat emitting device, and the other side - for contact with the stream of the coolant. Side is made with perforating dead openings isolated from each other and having the depth exceeding the diameter of their circumference at least by 50% and uniformly located on its surface forming beams, the width of which is chosen from the condition of providing strength and rigidity of panel. Openings are made perpendicular to the panel surface and occupy maximum possible area of the surface from side of panel. As a result, the new technical solution, which includes simplification of the design and increase of durability and intensification of heat exchange from the heat stream to the working medium, especially under conditions of long effects of high temperatures, is found.

Description

HEAT EXCHANGER

Field of the Invention

The invention is related to heat exchangers designed to pick-off and remove heat with the purpose of cooling and maintaining required operating temperature conditions of computer devices to which electric, electronic, computer and radio electronic devices relate.

Prior Art

Heat-exchangers SU NsJfs 881 18, 894891 , 1776968, 1776970, RU tfsstf^o 64466, 73765, 2143657, 2321802, ^"2332818, 2334378, 2355969, US KsKs 7089996, 7900692, 2007/0084585, 2009/0073654, 2010/0002376, 2010/0032140, 201 1/00131 14, WO 2009/007168 are known.

The heat-exchanger for cooling of computer systems, the cylindrical cavity of which contains a heat-conducting base with a number of perpendicular studs placed uniformly and tangent to the cylindrical cover and the means of coolant circulation is known. The above studs have a conical shape and their small bases are placed tangent to the cover (RU N° 64466).

The heat-exchanger for heat treatment of liquid food products is known, containing corrugated surface with a peripheral packing slot located between the inlet and outlet holes for heat exchanging medium; at this the corrugations are located parallel to each other and are made as alternating groups of projections and cavities of different height and with a common plane of their bases; the groups of corrugations in adjacent plates are placed at an angle to each other; the surface height of lower corrugations increases along their length and in the area adjoining the peripheral packing slot it is equal to the height of higher corrugations (RU N° 2008602).

The heat-exchanger for cooling of elements of heat emitting electrical equipment is known, containing a body, a plateau, a mounting base with a cooled device and ribs; it is provided with disturbed flow surfaces made in the form of projections and small pits located on ribs, so that from one side of the plane the ribs have projections forming small holes on the other side of the planes ribs; the ribs are fastened to the outer surface, of the mounting base along the perimeter (RU JYs 2334378).

The heat-exchanger containing elements of roughness in the form of parallel projections and grooves located between them in form of projections is known. The projections are spaced from each other at the distance of S, related to the height of projections as h 1.5 S/h. The grooves are located at the distance of 1.5 h from projections and have the depth equal to the height of the projection (SU N° 1776970).

The heat-exchanger containing the heat exchanging surface with the elements of roughness in the form of parallel projections is known, located in relation to each other at the distance 10 times equivalent to their height (SU JNb 1776968).

The above surface has an elaborate design that creates certain technological difficulties for its fabrication.

The heat-exchanger containing a base made of heat-conducting material with ribs made of heat-conducting material and placed with a gap between them is known, the size of the gap between the ribs is less than the thickness of the rib, and varies from 0.1 to 0.5mm inclusive, and the thickness of each rib varies from 0.6 to 2 mm inclusive, the base and the ribs are made as one solid piece (RU N° 82827, prototype).

Intensification of heat exchange takes place due to creation of a steady column like vortical structure of medium stream in small holes at low medium speed. Increase of heat exchange surface efficiency is gained due to minimization of the bottom part of the grooves.

The drawbacks of the known heat-exchangers is low reliability and durability as well as insufficient efficiency because of comparatively small surface of heating, that results in insufficient intensification of heat exchange limiting their economic feasibility and reducing operational reliability of the device, besides, such designs are not optimal from the cost of production point of view.

Summary of the Invention

The technical task of the invention is creation of an effective heat-exchanger and extension of arsenal of heat-exchangers.

As a result of use of the invention being claimed, obtaining of technical benefits is assured, which include simplification of the design and increase of durability and intensification of heat exchange from a heat stream to the working medium, especially under conditions of long effects of high temperatures. In particular, this is provided by reducing accumulation of dirt deposits in the especially critical zone of spot contact with a heat emitting device, which increases the period of trouble-free operation of a heat emitting device and/or increases the interval of interservice operation of the heat-exchanger. Thus, it helps to reduce the requirements to the quality of the material of the heat-exchanger from the point of view of its durability, flexibility and composition of the material, as the requirements of durability and rigidity are not violated.

The concept of the invention consists in that the heat-exchanger contains a panel made of a heat-conducting material, one side of the panel is intended for contact with a heat emitting device, and the other one - for contact with the stream of the coolant, the latter is made with perforation of dead openings isolated from each other and having the depth exceeding the diameter of their circumference at least by 50% and uniformly located on its surface with formation of beams, the width of which is chosen from the condition of providing durability and rigidity of the panel.

The preferable depth of the dead openings is chosen maximally possible from the condition of providing the strength of the wall between the bottom of the opening and the side intended for contact with a heat emitting device; perforated openings are located in rows chequer-wise or cellular-wise and the beams between them are made with the width no more than the diameter of the circumference around the openings; perforated openings are made perpendicular to the surfaces of the panel and occupy maximum possible surface of the panel; perforated openings are made with the same shape of section depth consisting of the following groups: circumference, ellipse, oval, polygon, the side intended for contact with a heat emitting device is made with a minimum possible roughness.

In addition, the panel is made in the form of a rectangular plate; the panel is made of a non-ferrous alloy; from the side of contact with the stream of the coolant the panel is provided with grooves for coolant circulation; the perforated openings are made using the following group of methods: laser, cutting, drilling and sand blasting. Description of the drawing

Fig. 1 of the drawing shows the panel of the heat-exchanger from the perforation side, Fig. 2 shows the panel of the heat-exchanger in a three-dimensional (axonometric) view with a conditional section, Fig. 3 shows the cover of the heat- exchanger.

Detailed Description of the Invention

The heat-exchanger includes a panel 1 made of a heat-conducting material (bronze, brass, copper et cetera), side 2 is intended for contact with a heat emitting device (not shown), and the other side 3 - is intended for contact with the stream of the coolant. Side 3 is made with perforations of dead openings 4 isolated from each other and made with the depth exceeding the diameter of their circumference at least by 50% and uniformly distributed along the surface of side 3, forming beams the width of which is chosen from the condition of providing strength and rigidity of panel 1.

The depth of the dead perforating openings 4 is chosen maximally possible from the condition of providing the strength of the wall between the bottom of the opening 4 and side 2 is intended for contact with a heat emitting device.

The perforating openings 4 are placed in rows chequer-wise or cellular-wise and the beams between them are made with the width no more than the diameter of the circumference around openings 4, which can have a geometrically regular or irregular shape.

Preferentially the perforating openings 4 are made perpendicular to the panel surface and occupy maximum possible space on the surface of side 2 of panel 1.

Perforating openings 4 preferentially are made with the same and constant shape of section depth consisting of the following groups: circumference, ellipse, oval, and polygon.

The surface of side 2 is designed for contact with a heat emitting device; it is made with a minimum possible roughness, and preferentially polished.

Panel 1 for example, is made in the form of a rectangular plate made of high- heat-conducting non-ferrous alloy. From side 3 of contact with the stream of the coolant panel 1 can have guide walls 5 intended to form a certain direction of stream of coolant circulation. In other cases walls 5 can be made on a separate detail.

Perforating openings 4 can be made by any method from the following group: laser, cutting, drilling or sand blasting.

As a rule the heat-exchanger is used with a cover 6, which has inlet and outlet openings for coolant 7 and 8 respectively.

The heat-exchanger is operated as follows.

Panel 1 of the heat-exchanger is made of a heat-conducting material, one of the sides 2 contacts with the mating surface of a heat emitting device. By its other side 3 panel 1 contacts (is washed) by the stream of the coolant, circulating in accordance with the direction of its grooves between walls 5, for example, from the center to the periphery.

In the process of operation the heat-exchanger contacts a heat emitting device by its respective surface of side 2 and transmits heat to it. The material of plate 1 intensively absorbs heat by its polished side 2 and passes it to the working medium (coolant) washing the surface from the other side 3 of plate 1. The heat delivery surface includes all lateral surfaces of perforating openings 4, the bottom of which is located on minimum possible (from the condition of strength) distance from the heated surface of side 2. The mode of dynamic flowing around the upper edges and the bottom of openings 4 and formation of vortex inside openings 4 does not allow formation of a stable laminar wall stream layer of the coolant, i.e. does not allow to create layers of the coolant isolated from the surface of heat exchange, thus, the whole stream of the coolant is involved into the process of heat exchange.

In the formed turbulent mode the number of molecules of the coolant making vortex motion and being able to remove heat from the heat exchanging surface is sharply increased, thus, intensifying the process and at the same time the influence of turbulent jets does not allow formation of contaminating deposits.

At this, there occurs a maximal removal and expedited transfer of heat energy.

As a result the efficiency of the process of heat energy removal, i.e. the realization of the purpose of the heat-exchanger being claimed, from a heat emitting device increases. Thus, the heat emitting device is reliably protected from overheating and abnormal performance caused by overheating.

In accordance with the suggested technical solution prototype models were made, which successfully passed tests and confirmed obtaining of technical result.

Thus, technical result is attained comprising simplification of the design and increase of durability and intensification of heat exchange from the heat stream to the working medium, especially under conditions of long influence of high temperatures.

It is provided, in particular, by minimizing accumulation of dirt deposits in the especially critical zone of contact with a heat emitting device, which increases the expected period of trouble-free operation of a heat emitting device and/or increases the period of interservice operation of the heat-exchanger. Thus, reducing the requirements to the quality of the heat-exchanger material from the point of view of its strength, elasticity and composition of the material proper.

Industrial Applications

The present invention is implemented using the universal modern equipment available in the industry.

Claims

1. Heat exchanger containing the panel made of heat-conducting material one side of which is intended for contact with a heat emitting device and the other side - for contact with the stream of the coolant, the latter is made with perforating dead openings isolated from each other and having the depth exceeding the diameter of their circumference at least by 50% and uniformly located on its surface with formation of beams, the width of the latter is chosen from the condition of providing durability and rigidity of the panel.

2. Heat exchanger according to claim 1, characterized in that the depth of the dead openings is chosen maximally possible from the condition of providing the strength of the wall between the bottom of the opening and the side intended for contact with a heat emitting device.

3. Heat exchanger according to any of the claims 1, 2, characterized in that the perforating openings are placed in rows chequer-wise or cellular-wise, and the beams between them are made with the width no more than the diameter of circumference around the openings.

4. Heat exchanger according to any of the claims 1, 2 characterized in that the perforating openings are made perpendicular to the panel surface and occupy maximal possible surface of the panel.

5. Heat exchanger according to any of the claims 1, 2 characterized in that the perforating openings are made with the same and similar in depth shape of section of one of the following group: circumference, ellipse, oval, and polygon.

6. Heat exchanger according to any of the claims 1, 2 characterized in that the side intended for contact with a heat emitting device is made with a minimum possible roughness.

7. Heat exchanger according to any of the claims 1 , 2 characterized in that the panel is made in the form of a rectangular plate.

8. Heat exchanger according to any of the claims 1, 2 characterized in that the panel is made of a non-ferrous alloy.

9. Heat exchanger according to any of the claims 1, 2 characterized in that from the side of contact with the stream of the coolant the panel is provided with grooves for circulation of the latter.

10. Heat exchanger according to any of the claims 1, 2 characterized in that the perforating openings are made using one of the methods of the group: laser, cutting, drilling, and sand blasting.