KR20190078128A - Condensing heat exchanger using porous heat transfer form - Google Patents

Abstract

The present invention relates to a condensing heat exchanger using a porous heat transfer foam, which aims to change the density of a heat transfer foam cell, to make the density less the closer it gets to a tube, wherein a subject fluid (a first fluid) flows, to allow an operation fluid (a second fluid) to be concentrated around the subject fluid, to improve the flow properties, rapidly discharge the condensed fluid, reduce flow resistance, and improve heat exchange efficiency. According to the present invention, the condensing heat exchanger using the porous heat transfer foam comprises: a tube (10) in which a first fluid flows; and a heat transfer foam (20) which has a foam structure having a plurality of open cells to wrap around the circumference unit of the tube, to allow a second fluid to flow in the open cell, and to induce heat exchange between the first fluid and second fluid. The heat transfer foam is formed to have a density increased as getting further from the tube as the center, to make the flow resistance of the second fluid different, and to make the second fluid concentrated on the circumference unit of the tube. According to the present invention, the condensing heat exchanger using the porous heat transfer foam comprises: the tube (10) in which the first fluid flows; the heat transfer foam which as a foam structure having a plurality of open cells to wrap around the circumference unit of the tube, to allow the second fluid to flow in the open cells, and to induce a heat exchange between the first fluid and the second fluid; and one or more discharge holes (27) formed inside the heat transfer foam to communicate with the outside from a surface of the tube and to discharge a condensed fluid formed on the tube and the heat transfer foam to the outside.

Description

{Condensing heat exchanger using porous heat transfer foam}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger, and more particularly, to a condensing heat exchanger using a porous heat transfer foam that improves flowability through heat exchange efficiency by changing cell density.

The present invention relates to a condensing heat exchanger using a porous heat transfer foam for heat exchange using a working fluid flowing through a plurality of open cells and increasing heat exchange efficiency by reducing the flow resistance through rapid drainage of condensed fluid.

A heat exchanger is a heat exchanger for exchanging fluids having different heat. The heat exchanger is for adjusting the target fluid to a desired temperature by using the heat of the working fluid, and includes a plate heat exchanger and a shell and tube heat exchanger.

Patent Document No. 10-0339714, which discloses a background art of the present invention, comprises a refrigerant pipe in which a refrigerant flow is formed into a predetermined shape, and a first process of surrounding a polyurethane, which is a porous material on a sponge, A second step of wetting the polyurethane with a liquid paste containing aluminum powder and flux; and a second step in which the metal powder absorbed by the polyurethane and removed by burning remains in the same form as the polyurethane, And a third step of heating the refrigerant pipe and the polyurethane to a predetermined temperature so as to be brazed to the pipe, wherein the cooling fin is formed in an irregularly formed foam form, The efficiency of heat exchange between the working fluid and the target fluid is poor.

In addition, the foamed cooling fins have poor heat exchange performance because a large amount of condensed fluid remains due to the characteristics of the foam and the flow resistance due to the condensed fluid becomes large.

Patent No. 10-0339714

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to improve the flowability so as to concentrate the working fluid (the second fluid) And to provide a condensing heat exchanger using a foam.

It is another object of the present invention to provide a condensing heat exchanger using a porous heat transfer foam that increases the heat exchange efficiency by reducing the flow resistance of the working fluid (second fluid) through rapid drainage of the condensation fluid.

The condensing heat exchanger using the porous heat transfer foam according to the present invention comprises: a tube through which a first fluid flows; A plurality of open cells having a foam structure surrounding a periphery of the tube and flowing a second fluid through the open cells to induce heat exchange between the first and second fluids, So that the second fluid is concentrated on the periphery of the tube by changing the flow resistance of the second fluid.

The condensing heat exchanger using the porous heat transfer foam according to the present invention comprises: a tube through which a first fluid flows; A plurality of open cells having a foam structure surrounding a periphery of the tube and flowing a second fluid through the open cells to induce heat exchange between the first and second fluids, And one or more drain holes formed to communicate with the outside from the surface and to discharge the condensed fluid formed on the tube and the heat conductive foam to the outside.

The present invention is characterized by including a drain pole formed in the drain hole and discharging the condensed fluid to the outside.

According to the condensing heat exchanger using the porous heat transfer foam according to the present invention, the density of the cells of the heat transfer foam is reduced toward the tube through which the object fluid (the first fluid) flows and the working fluid (second fluid) So that the heat exchange performance can be improved by concentrating the working fluid.

The heat transfer foam and the condensation fluid formed on the outer circumferential surface of the tube are quickly drained to solve the flow resistance due to the condensed fluid, thereby maximizing the heat exchange performance.

1A and 1B are perspective views of a condensation heat exchanger using a porous heat transfer foam according to the present invention,
Figure 1a shows that the heat transfer foam is in the form of a pin,
Fig. 1B shows the heating foam in block form.
2 is a side view and a front view of a condensation heat exchanger using a porous heat transfer foam according to the present invention.
FIG. 3 is a condensation heat exchanger using a porous heat transfer foam according to the present invention, showing a heat transfer foam when a plurality of tubes are continuous. FIG.
4 is a side view and a front view showing an example in which a drain hole is applied to a condensing heat exchanger using a porous heat transfer foam according to the present invention.
5 and 6 are views showing an example in which a drain pole is applied to a condensing heat exchanger using a porous heat transfer foam according to the present invention.
FIG. 7 is another example of a drain pole applied to a condensing heat exchanger using a porous heat transfer foam according to the present invention. FIG.
FIG. 8 is another example of a drain pole applied to a condensing heat exchanger using a porous heat transfer foam according to the present invention. FIG.

In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

≪ Example 1 >

As shown in FIGS. 1A and 1B, the condensing heat exchanger using the porous heat transfer foam according to the present embodiment includes a tube 10 through which a first fluid (for example, carbon dioxide of gas) flows and a tube 10 through which the first fluid And a porous heat transfer foam 20 through which a second fluid (for example, a natural gas, that is, a use of liquefying carbon dioxide by using the cold heat of natural gas) flows, thereby inducing heat exchange of the first and second fluids.

There are one or more tubes 10, and various structures capable of flowing the first fluid therein are possible, and various materials excellent in heat transfer effect are possible.

The heat conductive foam 20 is a foam-like product composed of a plurality of cells and is preferably a metal foam, and the plurality of cells are open cells communicating with each other, and the second fluid flows freely. (Fig. 1A) and a block form covering the tube 10 (Fig. IB) are possible.

The heat conductive foam 20 has a structure in which the second fluid is prevented from being lost through the peripheral surface. For example, it is possible to coat the shielding material, wrap the shielding material,

The second fluid is configured to flow in a direction perpendicular to the first fluid.

The manufacturing method of the present invention is applicable to a method of foaming and forming the heat conductive foam 20 at the periphery of the tube 10, a method of inserting the tube 10 into the heat conductive foam 20, and the like.

The present invention is characterized in that the heat transfer performance is improved through the concentration of the second fluid by making the flow of the second fluid close to the tube 10 by using the density change of the heat transfer foil 20.

That is, the density of cells (porosity) of the heat transfer foil 20 is increased as it goes farther from the tube 10, and as a result, the flow resistance of the second fluid is larger at a position farther from the tube 10, Since the flow resistance of the second fluid is small in the vicinity of the tube 10, the second fluid is concentrated near the tube 10 having a small flow resistance, thereby improving heat exchange performance with the first fluid.

Accordingly, the heat conductive foam 20 is composed of a plurality of heat transfer zones, all of which are heat transfer zones but have different densities (hereinafter, six heat transfer zones are illustrated and described as an example).

2, the first to sixth heat transfer zones 21, 22, 23, 24, 25, 26 are formed on the outer periphery of the tube 10 from the vicinity of the tube 10, The density of the first to sixth heat transfer zones 21, 22, 23, 24, 25, 26 gradually increases from the first heat transfer zone 21 to the sixth heat transfer zone 26.

Since the second fluid must be guided to a place having a low density, the first to sixth heat transfer zones 21, 22, 23, 24, 25, 26 are made of open cells communicating with each other.

The first through sixth heat transfer zones 21, 22, 23, 24, 25, 26 are formed concentrically with respect to the tube 10 in the structure of the tube 10.

Further, as shown in FIG. 3, when there are two or more tubes 10 in the flow path of the second fluid, the first to sixth heat transfer zones 21, 22, 23 , 24, 25, 26) preferably maintain their arrangement.

According to the condensing heat exchanger using the porous heat transfer foam having such a structure, the first fluid flows along the tube 10, the second fluid flows along the heat transfer foam 20 outside the tube 10, Heat exchange occurs between the second fluid.

More specifically, the second fluid flows along the first to sixth heat transfer zones 21, 22, 23, 24, 25, and 26 of the heat transfer foam 20, 26 to the first heat transfer zone 21, the second fluid flows toward the low flow resistance region and is thus concentrated in the first heat transfer zone 21 having the smallest density.

As a result, heat exchange efficiency between a large amount of the second fluid and the first fluid is achieved, so that the heat exchange efficiency is very high. Particularly, since the first and second fluids have different heat transfer performances (the first fluid flowing through the tube 10 is relatively heat transfer The performance of the first fluid is excellent by overcoming the difference in the heat transfer performance even if the performance is low.

≪ Example 2 >

As shown in FIG. 4, the condensing heat exchanger using the porous heat transfer foam according to the embodiment of the present invention is characterized in that a drain hole 27 is formed in the heat transfer foam 20 to quickly drain the condensed fluid.

The heat exchanger generates a condensed fluid due to the temperature difference during the heat exchange process between the first fluid and the second fluid.

The condensed fluid is formed on the outer circumferential surface of the tube 10 and the heat transfer foam 20, that is, the condensed fluid is formed in the path of the second fluid to block the flow of the second fluid, thereby lowering the heat exchange efficiency.

The drain holes 27 are formed in the heat transfer foil 20 at one or more, preferably at a predetermined distance from one another along the longitudinal direction of the tube 10.

The heat transfer foam 20 to which the drain hole 27 is applied may be an electrothermal foam having the same density and the electrothermal foam 20 having a different density as in the first embodiment.

The drain hole 27 is formed in a hole (circular shape or the like) formed inside the heat conductive foam 20, and the heat conductive foam 20 is an open cell, (Exposed to the outer circumferential surface of the tube 10), and the other side is opened to communicate with the outside, and the other side, which is a discharging means, is disposed at a lower position than the one side for dropping gravity, .

According to the present embodiment, the second fluid flows along the heat transfer foil 20, and flows through the entire heat transfer foam 20 due to the characteristics of the open cell, and then flows around the tube 10.

In the tube 10, a first fluid flows, and the first fluid exchanges heat with the surrounding second fluid.

Thus, when the first and second fluids exchange heat, a condensed fluid is generated due to a temperature difference.

Since the heat transfer foam 20 is an open cell, the condensed fluid flows downward due to gravity and is collected in the drain hole 27 and then drained to the outside along the drain hole 27.

As a result, since there is no resistance element for dropping the flow of the second fluid through the surface of the tube 10 and the inside of the cell of the heat transfer foam 20 through the structure of the drain hole 27, the heat exchange efficiency of the second fluid and the first fluid .

In this embodiment, a drain pole 30 can be applied to prevent the condensed fluid draining along the drain hole 27 from interfering with heat transfer.

The drain pawl 30 is preferably configured to collect and drain the condensate fluid around the circumferential surface (condensation surface) of the tube 10 and may include a curved cross section collecting portion 31) and a drain portion 32 inserted into the drain hole 27 and having one side connected to the water collecting portion 31 and the other side communicating with the outside to drain the condensed fluid collected in the water collecting portion 31 .

The collector 31 is spaced apart from the periphery of the tube 10 such that the second fluid flows along the surface of the tube 10 while collecting the condensed fluid, / 2 < / RTI >

It is preferable that the water collecting part 31 is disposed in a place where the density is the smallest (where the amount of generated condensed fluid is large) when one collecting part 31 is applied and the heat transfer foam 20 has a density change.

The drain part 32 is a column shape connected to the water collecting part 31 and receives the condensed fluid collected through the surface and the inside of the water collecting part 31 (depending on the structure of the water collecting part 31) And has a width smaller than the diameter of the drain hole 27 in order to reduce the flow resistance of the second fluid together with the smooth drainage, and may have various shapes such as a circular shape and a plate shape.

The drain pawl 30 is required to achieve two purposes of reducing drainage and flow resistance of the second fluid, and it is preferable that the drain pawl 30 is formed of a mesh structure for this purpose.

The drain pawl 30 is fixed to the tube 10 or the frame before foaming of the heat conductive foam 20 in the manufacturing method of foaming the heat conductive foam 20 around the periphery of the tube 10, The heat-conductive foam 20 may be manufactured by forming it in the heat-transfer foam 20. Alternatively, the drain pawl 30 may be inserted into the drain hole 27 formed in the heat conductive foam 20.

The present invention is not limited to this, and one drain portion 32 may be provided with a multi-stage (three in the drawing, for example) It is also possible to constitute the optical fiber 31.

In addition, as shown in Fig. 7, the gap retaining rods 33 may be configured such that the retaining portion 31 is spaced apart from the tube 10 by a predetermined distance.

The gap holding rods 33 are protruded from one or more, preferably two or more, of the collecting portion 31 to contact the surface of the tube 10 to maintain the gap between the tube 10 and the collecting portion 31 do.

The spacing rod 33 is sized and configured to minimize the flow resistance of the second fluid.

10: tube, 20: heating foam
21, 22, 23, 26: first to sixth heating zones,
27: drain hole,
30: drain pole,
31: collecting part, 32: drain part
33: spacing rod,

Claims (7)

A tube through which the first fluid flows;
A plurality of open cells having a foam structure surrounding a periphery of the tube and flowing a second fluid through the open cells to induce heat exchange between the first and second fluids,
Wherein the heat transfer foam is formed to have a higher density while moving away from the tube so that the flow resistance of the second fluid is made different so that the second fluid is concentrated on the periphery of the tube. Condensing heat exchanger. A tube through which the first fluid flows;
A plurality of open cells having a foam structure surrounding a periphery of the tube and flowing a second fluid through the open cells to induce heat exchange between the first and second fluids,
Wherein the heat transfer foam comprises at least one drain hole formed in the inside of the tube so as to communicate with the outside from the surface of the tube to discharge a condensed fluid to the tube and the heat transfer foam to the outside. group. [Claim 2] The method according to claim 1, further comprising at least one drain hole formed in the heat conductive foam so as to communicate with the exterior from a surface of the tube and to discharge a condensed fluid formed in the tube and the heat conductive foam to the outside, Condensation heat exchanger using foam. The condensing heat exchanger according to claim 2 or 3, further comprising a drain pour which collects the condensed fluid around the circumference of the tube and discharges the condensed fluid to the outside through the drain hole. [6] The apparatus of claim 4, wherein the drain pole comprises at least one collecting part disposed in the heat transfer foam, and a drain part inserted into the drain hole and draining the condensed fluid collected in the collecting part to the outside. Condensation heat exchanger using foam. The condensing heat exchanger according to claim 5, wherein the drain pole is a mesh structure that reduces the flow resistance of the second fluid. [Claim 6] The porous heat transfer foam according to claim 5, wherein the drain pawl includes one or more spacing rods protruding from the collecting portion and supported at the periphery of the tube so as to maintain an interval between the tube and the collecting portion. Condensation heat exchanger used.

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