DE102016223025A1 - heat exchanger tube - Google Patents

Abstract

A heat exchange tube includes a tube body, a liquid phase passage layer provided inside the tube body, allowing a liquid phase fluid therein to enter, a vapor phase passage layer provided inside the tube body and allowing a vapor phase fluid to pass therein , and a porous layer provided within the tube body and disposed between the liquid phase passage layer and the vapor phase passage layer.

Description

Technical area

The present disclosure relates to a heat exchanger tube, and more particularly to a heat exchanger tube capable of significantly increasing heat exchange performance.

background

A heat exchanger is a device used to transfer heat between one or more fluids, and broadly includes a heater, a cooler, a condenser, and the like, but is primarily intended for heat recovery. Heat exchangers may be used in a variety of industrial applications, such as vehicles, steam generators, ships, buildings, and the like.

A heat exchanger may include a housing having a chamber through which two different fluids pass to exchange heat, and may include one or more heat exchanger tubes installed in the chamber of the housing. In the heat exchanger tube, a passage is formed that allows a first fluid to pass therethrough, wherein a passage is formed outside the heat exchanger tube, allowing a second fluid to pass therethrough.

Inner fins are installed to increase a heat transfer area within the heat exchanger tube, wherein the inner fins may be formed such that a plurality of protrusions and a plurality of depressions are formed continuously. Heat exchange performance can be enhanced by increasing the number of protrusions and depressions of the inner fins.

Since a liquid phase and a vapor phase coexist within a heat exchanger tube of a heat exchanger, such as an evaporator or a condenser, a phase transition such as evaporation or liquefaction is adversely affected, resulting in deterioration of heat exchange performance.

Summary

The present disclosure is intended to solve the above-mentioned problems encountered in the prior art while retaining advantages achieved by the prior art.

One aspect of the present disclosure provides a heat exchanger tube that performs a phase transition smoothly, such as evaporation (in an evaporator) or liquefaction (in a condenser), by separating a liquid phase and a vapor phase of a fluid flowing inside a tube , which allows a significant increase in heat exchange performance.

According to an exemplary embodiment of the present disclosure, a heat exchanger tube includes: a tube body; a liquid phase passage layer provided within the tube body, which allows a liquid phase fluid to pass therethrough; a vapor phase penetration layer provided within the tubular body, which allows a vapor phase fluid to pass therethrough; and a porous layer provided in the tube body disposed between the liquid-phase passage layer and the vapor-phase passing layer to partition the liquid-phase passing layer and the vapor-phase passing layer.

Brief description of the drawings

The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

1 FIG. 4 is a front view showing a heat exchanger according to various exemplary embodiments of the present disclosure. FIG.

2 FIG. 10 is a cross-sectional view showing a heat exchanger tube according to an exemplary embodiment of the present disclosure. FIG.

3 is a cross-sectional view taken along a line BB 1 ,

4 is an illustration showing an alternative construction of the 2 shows.

5 FIG. 10 is a diagram showing a heat exchanger tube according to another exemplary embodiment of the present disclosure. FIG.

6 is a cross-sectional view taken along a line CC 5 ,

7 is an illustration showing an alternative construction of the 5 shows.

8th FIG. 10 is a cross-sectional view showing an example of a fin structure of a heat exchanger tube according to an exemplary embodiment of the present disclosure. FIG.

9 FIG. 10 is a cross-sectional view showing another example of a fin structure of a heat exchanger tube according to an exemplary embodiment of the present disclosure. FIG.

10 FIG. 10 is a cross-sectional view showing another example of a fin structure of the heat exchanger tube according to an exemplary embodiment of the present disclosure. FIG.

Detailed description

Hereinafter, an exemplary embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. For a better understanding, dimensions of elements or thicknesses of lines shown in the drawings are exaggerated. Likewise, the terms used herein have been defined in light of the functions of the present disclosure and may be changed according to the intent of an operator, or may be used in accordance with conventional practice. Therefore, terms should apply based on the entire content of this specification.

Regarding 1 can be a heat exchanger 10 According to various exemplary embodiments of the present disclosure, a housing 11 and one or more within the housing 11 installed heat exchanger tubes 20 include.

The housing 11 may have a cylindrical shape or a rectangular parallelepiped shape.

One or more heat exchanger tubes 20 can in an interior of the housing 11 be installed and can be in a length direction of the housing 11 extend.

A first pass 6 , in which a first fluid flows, can within the heat exchanger tube 20 be formed, and a second passage 16 in which a second fluid flows can outside the heat exchanger tube 20 be educated. That within the heat exchanger tube 20 flowing first fluid and outside the heat exchanger tube 20 flowing second fluid may be heat exchanged.

A plurality of heat exchanger tubes 20 Can be installed so that these are inside the case 11 spaced from each other, wherein the second passage 16 in which the second fluid flows, between adjacent heat exchanger tubes 20 can be trained. In particular, an outer fin 15 between the adjacent heat exchanger tubes 20 be installed, the second passage in a stable manner between the adjacent heat exchanger tubes 20 through the outer fin 15 can be formed.

According to an exemplary embodiment, the heat exchanger 10 of the present disclosure for a Rankine process or a refrigeration cycle using a phase change material.

According to a further exemplary embodiment, the heat exchanger 10 According to the present disclosure, a structure without the housing 11 such as in an air-cooled heat exchanger or the like, or the second passage 16 can be formed by a separate heat exchanger tube.

Regarding 2 and 3 can the heat exchanger tube 20 According to various exemplary embodiments of the present disclosure, a tubular body 21 comprising a flat top surface and bottom surface, wherein the first fluid is within the tube body 21 can flow.

An inlet 21a into which the first fluid is introduced may be at one end of the tubular body 21 be provided, and an outlet 21b from which the first fluid is ejected may be at the other end of the tubular body 21 be provided.

A liquid phase penetration layer 31 , a vapor-phase penetration layer 32 and a porous layer 33 can be inside the pipe body 21 be provided.

The liquid phase penetration layer 31 may be in a length direction L of the tubular body 21 extend and may be in a lower portion of the tubular body 21 be arranged. Therefore, the first liquid-phase fluid can enter the liquid-phase permeation layer 31 in the length direction of the tubular body 21 enter.

The vapor phase penetration layer 32 may be in a length direction L of the tubular body 21 extend and may be in an upper portion of the tubular body 21 be arranged. Therefore, the first vapor phase fluid may enter the vapor phase penetration layer 32 in the length direction of the tubular body 21 enter.

The porous layer 33 may be in the length direction of the tubular body 21 extend and may be between the liquid phase penetration layer 31 and the vapor phase penetration layer 32 be arranged. The porous layer 33 may be a structure having a plurality of pores 33a wherein the first liquid phase fluid passing through the liquid phase penetration layer 31 and the first vapor phase fluid passing through the vapor phase penetration layer 32 passes through the porous layer 33 can be separated. As a liquid phase and a vapor phase through the porous layer 33 can be separated, evaporation by an evaporator or liquefaction by a condenser can be performed more uniformly.

The heat exchanger 10 According to an exemplary embodiment of the present disclosure, an evaporator that vaporizes the first liquid phase fluid to the first vapor phase fluid may be 2 to 4 represent a structure in which the heat exchanger tube 20 used in an evaporator.

According to an exemplary embodiment, which in 2 and 3 is shown, the first liquid phase fluid flowing into an interior of the heat exchanger tube 20 is introduced by a heat exchange (heating) with a second fluid, which has a high temperature, evaporated, so as to be converted into the first vapor phase fluid.

The liquid phase penetration layer 31 according to an exemplary embodiment of the 2 can be a fin structure 40 which increases a contact area of the first fluid in a liquid phase.

The fin structure 40 may include: a base portion 41 placed in a lower section of the heat exchanger tube 20 is arranged, a plurality of fins 42 coming from the base section 41 protrude, and a plurality of recesses 43 that exist between neighboring fins 42 are formed. The several Finns 42 may be at a mutual distance in a width direction W of the base portion 41 be formed, wherein the plurality of recesses 43 between the several Finns 42 can be trained.

A head section 44 can be at one end of the fin 42 be formed and may have a width which is greater than that of the fin 42 is. The head section 44 may have a curved structure around a recess 45 to be formed in a central portion thereof so that a contact area of the first liquid-phase fluid can be further increased.

The fin structure 41 may be in a length direction L of the tubular body 21 extend, wherein the first liquid-phase fluid in the length direction L of the tubular body 21 through the several recesses 43 can flow.

When the first liquid phase fluid in the liquid phase penetration layer 31 If vapor is evaporated, vaporization of the first liquid phase fluid through the pores may occur 33a the porous layer 33 on which they are positioned to be reinforced.

As in 2 and 3 is shown, the base section 41 in a lower portion of the heat exchanger tube 20 be positioned, with the several fins 42 to the porous layer 33 stand out and where each recess 43 to the porous layer 33 is open. Therefore, if the first fluid phase fluid, along the recess 43 flows, is vaporized, then the first liquid phase fluid can more quickly to the porous layer 33 move towards.

The first liquid-phase fluid and the first vapor-phase fluid can effectively pass through the porous layer 33 in particular, since the first liquid-phase fluid passes through the pores in a simple manner 33a the porous layer 33 Bubbles can generate, the first liquid phase fluid can be quickly evaporated.

The air gap 33a the porous layer 33 of the heat exchanger tube 20 that used in an evaporator may be made to be 1 to 2 times larger than the bubbles, therefore generation of the bubbles can be accelerated and a uniform evaporation rate can be effectively controlled.

The vapor phase penetration layer 32 can a cavity 32a that allows the first vapor phase fluid to flow uniformly therein.

As in 3 can be shown in the heat exchanger tube 20 used in the evaporator has a thickness t2 of the vapor phase penetration layer 32 adjacent to the outlet 21b greater than a thickness t1 of the vapor phase penetration layer 32 adjacent to the inlet 21a , That is, a thickness of the vapor phase penetration layer 32 may be formed to increase in a flow direction of the first fluid (see direction F1 in FIG 3 ), whereby a cross-sectional area of the vapor phase penetration layer 32 can be gradually increased in the flow direction F1 of the first fluid. Therefore, a larger amount of the first vapor phase fluid can be generated.

As in 4 can represent one or more subdivisions 32b in the cavity 32a the vapor phase penetration layer 32 be installed, the cavity 32a the vapor phase penetration layer 32 through the subdivisions 32b is divisible in a width direction. Dividing the vapor phase penetration layer 32 may further increase the evaporation efficiency of the first fluid.

As in 3 and 4 is shown, the inlet 21a of the tubular body 21 be formed so as to communicate with the liquid phase penetration layer 31 to communicate, and the outlet 21b of the tubular body 21 may be configured to communicate with the vapor phase penetration layer 32 to communicate. Therefore, the first liquid phase fluid can flow directly through the inlet 21a to the liquid phase penetration layer 31 are introduced after the first liquid phase fluid within the heat exchanger tube 20 has been transferred to the first vapor phase fluid, the first vapor phase fluid passing directly through the outlet 21b Therefore, the first liquid phase fluid and the first vapor phase fluid can be expelled more effectively through the porous layer 33 can be separated.

The heat exchanger 10 According to another exemplary embodiment of the present disclosure, a condenser may be that condenses the first vapor phase fluid into a first fluid in a liquid phase 5 to 7 show a structure in which the heat exchanger tube 20 at the heat exchanger 10 is used as a capacitor.

According to the in 5 and 6 Illustrated exemplary embodiment, a first vapor phase fluid, which in an interior of the heat exchanger tube 20 has been introduced by heat exchange (heating) with a second fluid having a low temperature, are liquefied, so as to be converted into a first fluid in a liquid phase.

The vapor phase penetration layer 32 in which the first vapor phase fluid according to an exemplary embodiment of the 5 flows, can be a fin structure 40 which increases a contact area of the first vapor phase fluid.

The fin structure 40 can be a base section 41 have, several fins 42 coming from the base section 41 protrude, and several recesses 43 that exist between neighboring fins 42 are formed. The several Finns 42 may be at a mutual distance from each other in a width direction W of the base portion 41 be formed, wherein the plurality of recesses 43 between the several Finns 42 can be trained.

A head section 44 can be at one end of the fin 42 be formed and may have a width which is greater than that of the fin 42 is. The head section 44 may have a curved structure around a recess 45 which is formed in a central portion thereof, therefore, a contact area of the first vapor phase fluid can be further increased.

The fin structure 41 may be in a length direction L of the tubular body 21 extend, wherein the first vapor phase fluid through the plurality of recesses 43 in the length direction L of the pipe body 21 can flow.

When the first vapor phase fluid is in the vapor phase penetration layer 32 flows, is condensed, then a liquefaction of the first vapor phase fluid through the pores 33a the porous layer 33 that is positioned to be strengthened.

As in 5 is shown, the base section 41 in a lower portion of the heat exchanger tube 20 be positioned, with the several fins 42 towards the porous layer 33 stand out and where each recess 43 to the porous layer 33 is open. Therefore, if the first vapor phase fluid, along the recess 43 flows, is liquefied, then the first liquid phase fluid can more quickly to the porous layer 33 move.

The first liquid phase fluid and the first vapor phase fluid may pass through the porous layer 33 can be effectively separated, and in particular, since the first liquid-phase fluid easily through the pores 33a the porous layer 33 is separable, when the first vapor phase fluid is condensed to the first fluid in a liquid phase, condensing are performed quickly.

The liquid phase penetration layer 31 can a cavity 31a to allow the first liquid phase fluid to flow uniformly therein.

As in 6 can be shown in the heat exchanger tube 20 used in the condenser, has a thickness t4 of the liquid-phase permeation layer 31 adjacent to the outlet 21b greater than a thickness t3 of the liquid phase penetration layer 31 adjacent to the inlet 21a be (t3 <t4). That is, a thickness of the liquid phase passage layer 31 may be formed to increase in a flow direction of the first fluid (see direction F2 in FIG 6 ), whereby a cross-sectional area of the liquid-phase penetration layer 31 can be gradually increased in the flow direction of the first fluid. Therefore, a larger amount of the first liquid phase fluid can be generated.

As in 7 can represent one or more subdivisions 31b in the cavity 31a the liquid phase penetration layer 31 be installed, the cavity 31a the liquid phase penetration layer 31 through the subdivisions 31b may be divided in a width direction. Dividing the liquid phase penetration layer 31 may further increase a liquefaction efficiency of the first fluid.

As in 6 and 7 is shown, the inlet 21a of the tubular body 21 be formed so as to communicate with the vapor phase penetration layer 32 to communicate, with the outlet 21b of the tubular body 21 may be formed so as to communicate with the liquid phase penetration layer 31 to communicate. Therefore, the first vapor phase fluid can pass directly through the inlet 21a into the vapor phase penetration layer 32 be introduced as the first vapor phase fluid directly through the outlet 21b within the heat exchanger tube 20 Therefore, the first vapor phase fluid and the first liquid phase fluid can be expelled more effectively through the porous layer 33 can be separated.

8th shows a fin structure 40 According to another exemplary embodiment of the present disclosure. In the 8th illustrated fin structure 40 can be a base section 41 have a plurality of fins 42 coming from the base section 41 protrude, and a plurality of recesses 43 that exist between neighboring fins 42 are formed. The several Finns 42 may be at a mutual distance from each other in a width direction W of the base portion 41 be formed, wherein the plurality of recesses 43 between the several Finns 42 can be trained. Every Finn 42 may have a width that gradually becomes narrower in a protruding direction.

9 shows a fin structure 40 According to another exemplary embodiment of the present disclosure. In the 9 illustrated fin structure 40 can be a base section 41 have a plurality of fins 42 coming from the base section 41 protrude, and a plurality of recesses 43 that exist between neighboring fins 42 are formed. The several Finns 42 may be at a mutual distance from each other in a width direction W of the base portion 41 be formed, wherein the plurality of recesses 43 between the several Finns 42 can be trained. Every Finn 42 is with a rise in any direction from the base portion 41 from educated.

10 shows a fin structure 40 According to another exemplary embodiment of the present disclosure. In the 10 illustrated fin structure 40 can be a base section 41 have a plurality of fins 42 coming from the base section 41 protrude, and a plurality of recesses 43 that exist between neighboring fins 42 are formed. The several Finns 42 may be at a mutual distance from each other in a width direction W of the base portion 41 be formed, wherein the plurality of recesses 43 between the several Finns 42 can be trained. A head section 44 can be at one end of the fin 42 be formed and have a width which is greater than that of the fin 42 is. The head section 44 can have a flat surface 46 exhibit.

As described above, in the present disclosure, since the liquid phase and the vapor phase of the fluid flowing inside the tube are separated by the porous layer, a phase change such as evaporation (in an evaporator) or liquefaction may be performed (in a condenser) are performed uniformly, whereby a heat exchange performance is significantly increased.

Although the present disclosure has been described with reference to exemplary embodiments and the accompanying drawings, the present disclosure is not limited thereto, but may be modified and changed by those skilled in the art to which the present disclosure pertains in various ways without departing from The spirit and scope of the present disclosure as claimed in the following claims.

LIST OF REFERENCE NUMBERS

10

heat exchangers

11

casing

20

heat exchanger tube

21

pipe body

31

Liquid phase passage layer

32

Vapor permeation layer

33

porous layer

40

fin structure

Claims (9)

A heat exchanger tube comprising: a tube body; a liquid phase passage layer provided inside the tube body and allowing a liquid phase fluid to flow therein; a vapor phase permeation layer provided inside the tube body and allowing a vapor phase fluid to flow therein; and a porous layer provided inside the tube body disposed between the liquid-phase passage layer and the vapor-phase passing layer to partition the liquid-phase passing layer and the vapor-phase passing layer, and having a plurality of pores. The heat exchanger tube according to claim 1, wherein the liquid-phase permeation layer is disposed in a lower portion of the tube body and extends in a length direction of the tube body. The heat exchanger tube according to claim 1, wherein the vapor-phase penetrating layer is disposed in an upper portion of the tube body and extends in a length direction of the tube body. The heat exchanger tube according to claim 1, wherein the liquid-phase penetrating layer has a fin structure, and wherein the fin structure has a base portion, a plurality of fins protruding from the base portion, and a plurality of recesses formed between adjacent fins. A heat exchanger tube according to claim 4, wherein the vapor phase penetration layer has a cavity. Heat exchanger tube according to claim 5, wherein the cavity of the vapor phase passage layer is divided by one or more partitions. The heat exchanger tube of claim 1, wherein the vapor phase penetration layer has a fin structure, and wherein the fin structure has a base portion, a plurality of fins protruding from the base portion, and a plurality of recesses formed between adjacent fins. Heat exchanger tube according to claim 7, wherein the liquid-phase passage layer has a cavity. Heat exchanger tube according to claim 8, wherein the cavity of the liquid phase passage layer is divided by one or more partitions.

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