KR102025845B1 - Condensing heat exchanger using porous heat transfer form - Google Patents

Abstract

The present invention relates to a condensation heat exchanger using a porous heat transfer foam, wherein the density of the heat transfer foam cell changes, that is, close to the tube through which the target fluid (first fluid) flows, so that the working fluid (second fluid) becomes a target fluid The purpose of the present invention is to improve heat exchange efficiency by improving flowability so as to be concentrated in the surroundings, and to increase heat exchange efficiency by reducing flow resistance through rapid drainage of condensed fluid.
Condensation heat exchanger using a porous heat transfer foam according to the present invention, the first fluid flows through the tube 10; A foam structure having a plurality of open cells includes a heat transfer foam 20 surrounding the circumference of the tube and inducing a heat exchange of the first and second fluids by flowing a second fluid through the open cell, wherein the heat transfer foam is the tube. The density is increased as the distance away from the center so that the second fluid is concentrated around the tube by varying the flow resistance of the second fluid. Condensation heat exchanger using a porous heat transfer foam according to the present invention, the tube 10 through which the first fluid flows; A foam structure having a plurality of open cells includes a heat transfer foam 20 surrounding the circumference of the tube and inducing a heat exchange of the first and second fluids by flowing a second fluid through the open cell. It is formed to communicate with the outside from the surface of the tube includes one or more drain holes 27 for discharging the condensing fluid formed on the tube and the heat transfer foam to the outside.

Description

Condensing heat exchanger using porous heat transfer form

The present invention relates to a heat exchanger, and more particularly to a condensation heat exchanger using a porous heat transfer foam to improve the heat exchange efficiency by improving the flow through the density change of the cell.

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

The heat exchanger heat-exchanges fluids having different heats, and uses heat of the working fluid to adjust the target fluid to a desired temperature. There are plate heat exchangers and shell-and-tube heat exchangers.

Patent No. 10-0339714, which is a patent document for describing the background art of the present invention, comprises a first process of forming a refrigerant tube in which a refrigerant flows in a predetermined form and then enclosing a polyurethane, which is a sponge-like porous material, around the refrigerant tube. And a second process of wetting a liquid paste containing aluminum powder and flux to the polyurethane, and the polyurethane is burned and removed and only the metal powder adsorbed on the polyurethane remains in the same form as the polyurethane. A heat exchanger manufacturing method comprising a third process of heating the refrigerant pipe and polyurethane to a predetermined temperature so as to be brazed to a pipe, wherein the cooling fin is formed in an irregularly formed foam, but intentionally concentrates a working fluid on the refrigerant pipe. Since it is not configured, the heat exchange efficiency between the working fluid and the target fluid is not good.

In addition, the cooling fin of the foam form is poor in heat exchange performance because a large amount of condensation fluid remains due to the foam properties to increase the flow resistance due to the condensation fluid.

Patent Registration No. 10-0339714

The present invention is to solve the problems as described above, porous heat transfer to improve the heat exchange efficiency between the first and second fluids by improving the flowability to concentrate the working fluid (second fluid) to the target fluid (first fluid) The purpose is to provide a condensation heat exchanger with foam.

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

Condensation heat exchanger using a porous heat transfer foam according to the present invention, the first fluid flows through the tube; A foam structure having a plurality of open cells, and wraps around the circumference of the tube and includes a heat transfer foam in which a second fluid flows in the open cell to induce heat exchange between the first and second fluids. The density is increased as the distance away from the second fluid is characterized in that the second fluid is concentrated on the periphery of the tube by changing the flow resistance of the second fluid.

Condensation heat exchanger using a porous heat transfer foam according to the present invention, the first fluid flows through the tube; A foam structure having a plurality of open cells includes a heat transfer foam surrounding the circumference of the tube and inducing a heat exchange of the first and second fluids by flowing a second fluid through the open cell, wherein the heat transfer foam is formed inside the tube. It is formed so as to communicate with the outside from the surface, characterized in that it comprises one or more drain holes for discharging the condensing fluid formed on the tube and the heat transfer foam to the outside.

The present invention is characterized in that it comprises a drain pole is formed in the drain hole for discharging the condensation fluid to the outside.

According to the condensation heat exchanger using the porous heat transfer foam according to the present invention, the working fluid (second fluid) flowing far away from the tube is made smaller by decreasing the density of the cell of the heat transfer foam closer to the tube through which the target fluid (first fluid) flows. Induction into the circumference of the tube has the effect of improving heat exchange performance through concentration of the working fluid.

In addition, by rapidly draining the condensation fluid formed on the outer circumferential surface of the heat transfer foam and the tube, the flow resistance due to the condensation fluid is solved, thereby maximizing heat exchange performance.

1a and 1b are respectively a perspective view of a condensation heat exchanger using a porous heat transfer foam according to the present invention,
Figure 1a is that the heat transfer foam is in the form of a fin,
1B shows that the heat transfer foam is in the form of a block.
Figure 2 is a side and front view of the condensation heat exchanger using a porous heat transfer foam according to the present invention.
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.
Figure 4 is a side and front view showing an example in which the drainage hole is applied to the condensation 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 condensation heat exchanger using a porous heat transfer foam according to the present invention.
Figure 7 is another illustration of the drain pole applied to the condensation heat exchanger using a porous heat transfer foam according to the present invention.
Figure 8 is another illustration of a drain pole applied to the condensation heat exchanger using a porous heat transfer foam according to the present invention.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

<Example 1>

As shown in FIGS. 1A and 1B, the condensation 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 circumference of the tube 10. The second fluid (for example, natural gas, ie, liquefied carbon dioxide by using cold heat of natural gas) is composed of a porous heat-transfer foam 20 flowing to induce heat exchange of the first and second fluids.

One or more tubes 10 may be formed in various structures in which the first fluid flows therein, and various materials having excellent heat transfer effects may be possible.

The heat-transfer foam 20 is a foam-based product composed of a plurality of cells, preferably a metal foam, and the plurality of cells are open cells communicating with each other so that a second fluid flows freely, and the tubes 10 have a space therebetween. It is possible to form a plurality of pins (FIG. 1A) that are installed and block form (FIG. 1B) covering the tube 10.

Heat transfer foam 20 is a structure that is closed so that the second fluid is not lost through the circumferential surface, for example, the coating of the shielding material, the wrapping of the shielding material, it can be embedded in the case.

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

In the manufacturing method of the present invention, a method of foam molding the heat transfer foam 20 on the periphery of the tube 10, a method of inserting the tube 10 into the heat transfer foam 20, and the like are possible.

The present invention is characterized in that it is configured to improve the heat transfer performance through the concentration of the second fluid by bringing the flow of the second fluid close to the tube 10 by using the density change of the heat transfer foam 20.

In other words, the density (porosity) of the cells of the heat-transfer foam 20 increases as the center moves away from the tube 10, and consequently, the distance far from the tube 10 has a large flow resistance of the second fluid and conversely the tube Where near (10) is because the flow resistance of the second fluid is small, the second fluid is concentrated in the vicinity of the tube 10 with a small flow resistance, thereby improving the heat exchange performance with the first fluid.

Accordingly, the heat transfer foam 20 is composed of a plurality of heat transfer zones (all illustrated and described below with six examples) having different heat transfer zones but different densities.

For example, as shown in FIG. 2, the first to sixth heat transfer zones 21, 22, 23, 24, 25, and 26 are formed outside 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, and 26 increases gradually from the first heat transfer zone 21 to the sixth heat transfer zone 26.

Since the second fluid should be directed to a place where the density is low, the first to sixth heat transfer zones 21, 22, 23, 24, 25, and 26 are formed of open cells communicating with each other.

In the structure of the tube 10, the first to sixth heat transfer zones 21, 22, 23, 24, 25, and 26 are formed in the form of concentric circles about the tube 10.

In addition, 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, and 23 so that flow failure does not occur between the tubes 10. 24,25,26 preferably maintain their arrangement.

According to the condensation heat exchanger using the porous heat transfer foam having such a configuration, the first fluid flows along the tube 10 and the second fluid flows along the heat transfer foam 20 outside the tube 10 and in the process Heat exchange occurs between the second fluids.

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, where the sixth heat transfer zone ( Since the density is low as going to the first heat transfer zone 21 in FIG. 2), the second fluid flows toward the low flow resistance and is thus concentrated in the first heat transfer zone 21 having the smallest density.

As a result, the heat exchange efficiency is very high because a large amount of heat exchange between the second fluid and the first fluid occurs, and in particular, the difference between the heat transfer performance of the first and second fluids {the first fluid flowing through the tube 10 is relatively heat transfer. Even if the performance is low}, the heat exchange effect of the first fluid is excellent by overcoming the difference in heat transfer performance.

<Example 2>

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

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

The condensation fluid is bound to the outer circumferential surface of the tube 10 and the heat transfer foam 20, that is, the condensation fluid is bound to the path of the second fluid to block the flow of the second fluid, thereby reducing the heat exchange efficiency.

One or more drainage holes 27 are formed in the heat transfer foam 20 at a predetermined distance from each other, preferably along the longitudinal direction of the tube 10.

The heat transfer foam 20 to which the drainage hole 27 is applied may be all heat transfer foams having the same density, and heat transfer foams having different densities of the heat transfer foam 20 as in the first embodiment.

The drainage hole 27 is a hole formed in the heat transfer foam 20 (various shapes such as a circle). Since the heat transfer foam 20 is an open cell, the circumferential portion communicates with the surrounding cells while one side of the tube 10 is formed. It is associated with the outer circumferential surface {exposed to the outer circumferential surface of the tube 10} and the other side is open to communicate with the outside, so that the other side, which is a drainage end for gravity drop, is disposed at a position lower than one side, preferably the lowest condensed fluid Placed in place.

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

The first fluid flows in the tube 10, and the first fluid exchanges heat with the surrounding second fluid.

As such, when the first and second fluids exchange heat, condensation fluid is generated due to a temperature difference.

Since the heat-transfer foam 20 is an open cell, the condensation fluid flows downward by gravity and is collected into the drain hole 27 and then drained out to the outside along the drain hole 27.

As a result, there is no resistance element that causes the flow of the second fluid to drop in the surface of the tube 10 and the inside of the cell of the heat-transfer foam 20 through the configuration of the drainage hole 27. Will increase.

In the present embodiment, a drain pole 30 may be applied to solve that the condensed fluid drained along the drain hole 27 interferes with the heat transfer.

The drain pawl 30 is preferably configured to collect and drain condensing fluid around the circumferential surface (condensation surface) of the tube 10, for example, a curved cross-section catchment portion surrounding the circumference of the tube 10 ( 31) while being inserted into the drainage hole 27, one side is connected to the collecting portion 31, while the other side is composed of a drain portion 32 for draining the condensed fluid collected in the collecting portion 31 in connection with the outside. .

The water collecting part 31 is spaced apart from the circumference of the tube 10 so that the second fluid flows along the surface of the tube 10 while collecting the condensing fluid, for example, 1 of the circumference of the tube 10. The length is within / 2.

When one water collecting portion 31 is applied and the heat transfer foam 20 has a density change, the water collecting portion 31 is preferably disposed at the smallest density (where the amount of condensed fluid is generated).

The drain portion 32 is a columnar shape connected to the water collecting portion 31 and receives the condensed fluid collected through the surface of the water collecting portion 31 and the inside (depending on the structure of the water collecting portion 31) and drained to the outside. And, in order to reduce the flow resistance of the second fluid with a smooth drainage, it is composed of a width smaller than the diameter of the drainage hole 27, various forms such as circular, plate-like.

The drain pole 30 should achieve two purposes of reducing the flow resistance of the drainage and the second fluid, it is preferably configured in a mesh structure for this purpose.

In the manufacturing method of foaming the heat transfer foam 20 around the tube 10, the drain pole 30 is fixed to the tube 10 or the frame before the heat transfer foam 20 is foamed of the heat transfer foam 20. It may be produced by forming in the heat transfer foam 20. Alternatively, the drain pole 30 may be inserted into the drainage hole 27 processed in the heat transfer foam 20.

Although one catcher 31 is illustrated and described as being formed at the upper end of the drain 32, the present invention is not limited thereto, and a catcher having multiple stages (shown as three examples in the drawing) in one drain 32. It is also possible for 31 to be configured.

In addition, as shown in FIG. 7, the gap retaining rod 33 may be configured such that the water collecting part 31 maintains a constant distance from the tube 10.

The spacing retaining rod 33 is one or more, preferably two or more, protruding from the water collecting portion 31 so that the end touches the surface of the tube 10 to maintain the space between the tube 10 and the water collecting portion 31. do.

The gap retaining rod 33 has a size and a structure for minimizing the flow resistance of the second fluid.

10: tube, 20: heat transfer foam
21,22,23,, 26: first to sixth heat transfer zones,
27: drainage hole,
30: drain pole,
31: collecting part, 32: drain part
33: gap retaining rod,

Claims (7)

A tube through which the first fluid flows;
A foam structure having a plurality of open cells, surrounding the circumference of the tube and having a second fluid flowing through the open cell to induce heat exchange between the first and second fluids;
At least one drainage hole formed in the interior of the heat transfer foam to communicate with the outside from the surface of the tube to discharge the condensing fluid formed on the tube and the heat transfer foam to the outside;
A drain pawl collecting the condensed fluid around the circumferential surface of the tube and draining it to the outside through the drain hole;
The heat-transfer foam is formed to increase the density away from the center of the tube so that the second fluid is concentrated on the periphery of the tube by varying the flow resistance of the second fluid,
The drain pawl includes at least one water collecting unit disposed in the heat transfer foam and a drain unit inserted into the drainage hole and draining the condensed fluid collected at the water collecting unit to the outside. group. A tube through which the first fluid flows;
A foam structure having a plurality of open cells, surrounding the circumference of the tube and having a second fluid flowing through the open cell to induce heat exchange between the first and second fluids;
At least one drainage hole formed in the interior of the heat transfer foam to communicate with the outside from the surface of the tube to discharge the condensing fluid formed on the tube and the heat transfer foam to the outside;
A drain pawl collecting the condensed fluid around the circumferential surface of the tube and draining it to the outside through the drain hole;
The drain pawl includes at least one water collecting unit disposed in the heat transfer foam and a drain unit inserted into the drainage hole and draining the condensed fluid collected at the water collecting unit to the outside. group. delete delete delete The condensation heat exchanger of claim 1 or 2, wherein the drain pole has a mesh structure that reduces flow resistance of the second fluid. The porous according to claim 1 or 2, wherein the drain pole includes at least one gap retaining rod protruding from the catchment part and supported by the circumference of the tube to maintain a gap between the tube and the catchment part. Condensation heat exchanger using heat transfer foam.

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