CN1924507A - Helical groove heat exchange pipe for water heater - Google Patents

Helical groove heat exchange pipe for water heater Download PDF

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Publication number
CN1924507A
CN1924507A CNA2006101130277A CN200610113027A CN1924507A CN 1924507 A CN1924507 A CN 1924507A CN A2006101130277 A CNA2006101130277 A CN A2006101130277A CN 200610113027 A CN200610113027 A CN 200610113027A CN 1924507 A CN1924507 A CN 1924507A
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CN
China
Prior art keywords
pipe
heat exchange
jut
helical groove
water heater
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2006101130277A
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Chinese (zh)
Inventor
李志信
孟继安
沼田光春
笠井一成
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tsinghua University
Daikin Industries Ltd
Original Assignee
Tsinghua University
Daikin Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tsinghua University, Daikin Industries Ltd filed Critical Tsinghua University
Priority to CNA2006101130277A priority Critical patent/CN1924507A/en
Publication of CN1924507A publication Critical patent/CN1924507A/en
Priority to US12/440,186 priority patent/US20090250198A1/en
Priority to EP07792965A priority patent/EP2071266A4/en
Priority to AU2007292663A priority patent/AU2007292663B2/en
Priority to PCT/JP2007/066436 priority patent/WO2008029639A1/en
Priority to JP2008533094A priority patent/JP4768029B2/en
Priority to KR1020097006255A priority patent/KR20090055604A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/30—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means being attachable to the element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F28F1/424—Means comprising outside portions integral with inside portions
    • F28F1/426—Means comprising outside portions integral with inside portions the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Details Of Fluid Heaters (AREA)

Abstract

This invention relates to one spiral tank exchange tube, which is applied to inside tube heat exchanging with screw inner rib with flow Re lower than 7000 area with at least one part of tube section inner wall surface at entrance of flow nearby inner surface with several protruding parts with height for 0.5mm to 1.5mm; the height of protruding part height H1 and inner radium proportion as 0.05 to 0.15 or with protruding part height H1 and spiral rib height Hm proportion as 1 to 3.

Description

The helical groove heat exchange pipe that is used for water heater
Technical field
The invention belongs to technical field of water heaters, the Reynolds number (Re) that particularly is in the fluid that flows in the pipe is lower than the structural design of the water heater in 7000 zones with helical groove heat exchange pipe.
Background technology
In heat-exchange devices such as air-conditioning, water heater, be typically provided with heat exchanger tube, when it is characterized by water or other fluid and in heat exchange tube, flow, utilize the inside and outside temperature difference of pipe to carry out heat exchange.Be to improve the heat transfer property of heat exchanger tube, people utilize in the heat exchanger tube outer wall surface and are provided with groove and the heat exchanger tube inwall comes enhanced heat exchange for the structure of spiral ribs.In addition, also have a kind of by the technology that jut improves heat transfer property being set in the heat exchanger tube inner wall surface.
In the heat exchanger tube inner wall surface jut is set, because the heat transfer area of heat exchanger tube can increase, convection cell also produces perturbation action simultaneously, thereby causes the heat transfer coefficient on the heat-transfer area to increase, and heat transfer property is improved.But, in the heat exchanger tube inner wall surface jut is set, then because the pipe friction coefficient can increase, the pressure loss that flows in the pipe also can increase.For this reason, patent documentation 1 discloses a kind of technology: promptly highly be the jut of 0.45mm～0.6mm by being provided with on water-heater heat-exchanging inside pipe wall surface, promote and the heat transmission of cold-producing medium, suppress the expansion of the pressure loss simultaneously.In addition, patent documentation 2 also discloses a kind of technology: promptly heat exchanger tube adopts spiral grooved tube, improves the technology of heat transfer property.
[patent documentation 1]: the special fair 6-70556 of Japan
[patent documentation 2]: the special fair 2002-228370 of Japan
But, when the flow of heat exchanger tube inner fluid very low, the flow regime of tube fluid is in by the laminar region when the turbulent region transforms transition region, is the jut of 0.45mm～0.6mm even above-mentioned patent documentation 1 disclosed height is set, and the effect of augmentation of heat transfer also is very little.
For example, heat pump water heater as shown in Figure 1 in order to effectively utilize low-cost power supply at night, be spent for a long time water is heated to about 90 ℃ from about 10 ℃.At this, be miniaturization and the high efficiency of guaranteeing product, with the discharge in the water-heater heat-exchanging pipe of flowing through be set at very little numerical value (such as: 0.8L/min).For the less water-heater heat-exchanging pipe of in-pipe flow amount, the general employing by dwindling the internal diameter of heat exchanger tube improved the fluid velocity in the pipe, thereby improves heat transfer property.But, nonetheless and since the pipe in discharge little, the flow regime of in-pipe flow is: near flow inlet for to transform transitional region (Re=1500～3000) to the turbulent region by the laminar region; Even near flow export, also only reach the degree (Re=7000) at turbulent flow initial stage.Simultaneously, near flow inlet low-temperature region, because heat transfer coefficient is low, can't realize effective heat exchange.
Simultaneously, when the flow of heat exchanger tube inner fluid is very low, the flow regime of tube fluid is in by the laminar region when the turbulent region transforms transition region, can be lower by adopting spiral grooved tube to improve the effect of heat transfer property.And the spiral internal-rib of spiral grooved tube makes the tube wall border form strong turbulent flow, when spiral internal-rib height is bigger, can cause the increase of coefficient of friction, and the pressure loss that flows in the pipe will increase.
Summary of the invention
The purpose of invention is to overcome the shortcoming of above-mentioned prior art, provides a kind of simple in structure, and in the low reynolds number zone, can improve heat transfer property, the less water heater helical groove heat exchange pipe of the pressure loss in guaranteeing again to manage.
The 1st kind of water-heater heat-exchanging pipe that the present invention proposes is a kind of water heater helical groove heat exchange pipe that carries out heat exchange inside and outside pipe, is provided with the spiral internal-rib in the pipe; Being on the water-heater heat-exchanging inside pipe wall surface of at least a portion that the Reynolds number of tube fluid (Re) is lower than 7000 zones, be provided with a plurality of juts, the height H 1 of this jut is the jut of 0.5mm～1.5mm.
Adopt spiral grooved tube as heat exchanger tube, form turbulent flow, can obtain the effect that improves heat transfer property by the spiral internal-rib.But, in the low reynolds number zone of turbulent region transition,, just must add the height that increases the spiral internal-rib in the laminar region and by the laminar region if only adopt spiral grooved tube to improve heat transfer property, and the increase of spiral internal-rib height can improve the pipe coefficient of internal friction, increases the pressure loss in the pipe thus.
So, to the low reynolds number zone of turbulent region transition, promptly be in the pipeline section inner wall surface that reynolds number Re is lower than 7000 zones, be provided with a plurality of to the pipe inner process and highly be the jut of 0.5mm～1.5mm in the laminar region and by the laminar region.Its result because set jut in the pipe had both improved heat transfer coefficient, has suppressed the spiral fluted degree of depth again, and has reduced jut to the pipe influence that internal pressure loss caused, thereby water heater is improved with the overall performance of helical groove heat exchange pipe.
The 2nd kind of water heater helical groove heat exchange pipe that the present invention proposes is provided with the spiral internal-rib in the pipe; It is a kind of water heater helical groove heat exchange pipe that inside and outside pipe, carries out heat exchange, be lower than at the reynolds number Re that is in tube fluid on the pipeline section inner wall surface of at least a portion in 7000 zones, the ratio that is provided with a plurality of rising height H1 and inside diameter D is 0.05～0.15 jut.
When being provided with jut in the pipe, the pipe friction coefficient is reynolds number Re and function of relative roughness, at this, for showing the influence of pipe inner process portion to the pipe friction coefficient, has used the height of set jut in pipe and the ratio (being relative roughness) of bore.By the low reynolds number zone of laminar region to the turbulent region transition, be controlled in the prescribed limit by relative roughness the inside pipe wall face, just can realize improving heat-transfer effect, will be suppressed at minimal effect by the influence that the pressure loss is brought again.
For this reason, to the low reynolds number zone of turbulent region transition, promptly be in the pipeline section inner wall surface that Reynolds number (Re) is lower than 7000 zones, the ratio that a plurality of rising height H1 and bore D are set is 0.05～0.15 jut in the laminar region and by the laminar region.Its result because set jut in the pipe had both improved heat transfer coefficient, has reduced jut again to the pipe influence that internal pressure loss caused, thereby water heater is improved with the overall performance of helical groove heat exchange pipe.
The 3rd kind of water heater helical groove heat exchange pipe that the present invention proposes is a kind of heat exchanger that is used for water heater, and the heat exchanger tube that carries out heat exchange inside and outside pipe, is provided with the spiral internal-rib in the pipe; Being on the water-heater heat-exchanging inside pipe wall surface of at least a portion that the Reynolds number of tube fluid (Re) is lower than 7000 zones, be provided with a plurality of juts, its rising height H1 is 1～3 times of spiral internal-rib height H m.
When in having the spiral fluted heat exchange tube, establishing jut, when improving heat-transfer effect, be necessary that the influence that the pressure loss is caused is suppressed to bottom line by rising height H1 and spiral internal-rib height H m.Reynolds number (Re) is lower than in the low reynolds number zone in 7000 zones, when being provided with a plurality of rising height H1 and being 1～3 times of spiral internal-rib height H m jut, by set jut in spiral grooved tube and the pipe, when can improve heat transfer coefficient, suppress the spiral fluted degree of depth, and reduce jut to the pipe influence that internal pressure loss caused, water heater is improved with the overall performance of helical groove heat exchange pipe.
The 4th kind of water heater helical groove heat exchange pipe that the present invention proposes is a kind of heat exchanger that is used for water heater, and the heat exchanger tube that carries out heat exchange inside and outside pipe, is provided with the spiral internal-rib in the pipe; Being on the water-heater heat-exchanging inside pipe wall surface of at least a portion that the Reynolds number of tube fluid (Re) is lower than 7000 zones, be provided with a plurality of juts, and the interval between a plurality of juts (P1) is set at different value with spiral fluted pitch (Pm).When jut and helicla flute were arranged on the lap position, the coefficient of friction in the pipe can uprise, and the pressure loss in the pipe might increase rapidly.At this,,, can reduce the increase rapidly of the middle pressure loss in the pipe so that jut and spiral fluted position are not overlapping by the interval between the jut (P1) is set at different value with spiral fluted pitch (Pm).
The 5th kind of water heater helical groove heat exchange pipe that the present invention proposes is a kind of heat exchanger that is used for water heater, and carries out the water-heater heat-exchanging pipe of heat exchange inside and outside pipe; Be provided with the spiral internal-rib in the pipe; Fluid mobile in pipe is a water, and near the pipeline section inner wall surface that is in the fluid inlet place, the jut that to be provided with a plurality of rising height H1 be 0.5mm～1.5mm.
The flow regime that is used near the current the water-heater heat-exchanging pipe import department on the heat exchanger of water heater belong to the laminar region and/or by the laminar region to zone that the turbulent region transition transforms.Simultaneously, lower because of near the water temperature the water-heater heat-exchanging pipe flow inlet, heat transfer coefficient is also low.In the present invention, at least near the pipeline section inner wall surface that is in the water inlet place, the jut that a plurality of rising height H1 are set is 0.5mm～1.5mm is provided with jut in the hope of passing and improves the effect of heat transfer coefficient in pipe.Its result because set jut in the pipe had both improved heat transfer coefficient, has reduced jut again to the pipe influence that internal pressure loss caused, thereby the overall performance of water-heater heat-exchanging pipe is improved.
The 6th kind of water heater helical groove heat exchange pipe that the present invention proposes is a kind of heat exchanger that is used for water heater, and carries out the water-heater heat-exchanging pipe of heat exchange inside and outside pipe; Be provided with the spiral internal-rib in the pipe; Fluid mobile in pipe is a water, and near the pipeline section inner wall surface that is in the fluid inlet place, and the ratio that a plurality of rising height H1 and bore D are set is 0.05～0.15 jut.
The heat exchanger that is used for water heater, near the flow regime of the current the water-heater heat-exchanging pipe import department belong to the laminar region and/or by the laminar region to zone that the turbulent region transition transforms.Simultaneously, lower because of near the water temperature the water-heater heat-exchanging pipe flow inlet, heat transfer coefficient is also low.At this, be used for the heat exchanger of water heater at this, at least near the heat exchanger tube inner wall surface that is in the water inlet place, the ratio that a plurality of rising height H1 and bore D are set is 0.05～0.15 jut.Its result because set jut in the pipe had both improved heat transfer coefficient, has reduced jut again to the pipe influence that internal pressure loss caused, thereby water heater is improved with the overall performance of helical groove heat exchange pipe.
The 7th kind of water heater helical groove heat exchange pipe that the present invention proposes is a kind of heat exchanger that is used for water heater, and carries out the water-heater heat-exchanging pipe of heat exchange inside and outside pipe; Be provided with the spiral internal-rib in the pipe; Fluid mobile in pipe is a water, and near the pipeline section inner wall surface that is in the fluid inlet place, a plurality of juts is set, and its rising height H1 is 1～3 with spiral internal-rib height H m ratio.
Near the flow regime of the current the water-heater heat-exchanging pipe import department belong to the laminar region and/or by the laminar region to zone that the turbulent region transition transforms.Simultaneously, lower because of near the water temperature the water-heater heat-exchanging pipe flow inlet, heat transfer coefficient is also low.At this, in being provided with the spiral fluted heat exchanger tube, jut is set, improve heat transfer coefficient.But when in being provided with the spiral fluted heat exchanger tube jut being set, when being necessary by rising height H1 and spiral internal-rib height H m raising heat-transfer effect, the influence that the pressure loss caused is suppressed to bottom line.In Reynolds number (Re) is lower than 7000 low reynolds number zone, the rising height H1 of a plurality of juts is 1～3 o'clock with spiral internal-rib height H m ratio, because set jut in spiral grooved tube and the pipe, when improving heat transfer coefficient, can suppress the spiral fluted degree of depth, thereby reduced jut to the pipe influence that internal pressure loss caused, water heater is improved with the overall performance of helical groove heat exchange pipe.
The 8th kind of water heater helical groove heat exchange pipe that the present invention proposes is a kind of heat exchanger that is used for water heater, and the heat exchanger tube that carries out heat exchange inside and outside pipe, is provided with the spiral internal-rib in the pipe; The fluid that flows in pipe is a water, and is provided with a plurality of juts, the raising heat transfer coefficient near the pipeline section inner wall surface that is in the fluid inlet place.But when jut and helicla flute were arranged on the lap position, the coefficient of friction in the pipe can uprise, and the pressure loss in the pipe might increase rapidly.At this, the interval between the jut (P1) is set at different value with spiral fluted pitch (Pm).By making jut and spiral fluted position not overlapping, can reduce the increase rapidly of the middle pressure loss in the pipe.
The 9th kind of water heater helical groove heat exchange pipe that proposes among the present invention be, with in helical groove heat exchange pipe, flow rate of fluid mobile in pipe is 0.1m/s～0.6m/s at described the 1st kind of any one water heater to the 8th invention.If water heater is the suitableeest with the flow rate of fluid that flows in the helical groove heat exchange pipe pipe to be 0.2m/s～0.4m/s scope.When the flow rate of fluid that flows in pipe was lower than 0.1m/s, the heat transfer property of heat exchanger tube was very low.And the flow rate of fluid that flows in pipe causes the spiral grooved tube coefficient of internal friction to increase, the pressure loss increase in the pipe when being higher than 0.6m/s.Thus, the flow rate of fluid that flows in pipe adopts 0.1m/s～0.6m/s.Its result because helicla flute and the interior set jut of pipe had both improved heat transfer coefficient, has reduced jut again to the pipe influence that internal pressure loss caused, thereby the overall performance of water-heater heat-exchanging pipe is improved.
The 10th kind of water heater helical groove heat exchange pipe that the present invention proposes is, any one water heater in described the 1st kind to the 8th kind invention is with in the helical groove heat exchange pipe, shape of cross section at the jut arbitrary height can be: by circle, smoothed curves such as ellipse or sub-circular are formed.
As the influence key element of spiral grooved tube inner process portion, except the height of the Reynolds number of spiral internal-rib height, tube fluid, speed, jut, also should comprise the shape of jut to the tube fluid pressure loss.When jut is shaped as when acute angle-shaped, the current of walking around acute angle can produce whirlpool, thereby make the pressure loss of fluid become big.
Therefore, jut adopts following shape: promptly at the shape of cross section of jut arbitrary height by circle, smoothed curves such as ellipse or sub-circular are formed.In other words, because jut outer periphery surface is made up of level and smooth curve, compares when being shaped as acute angle with jut, can reduce the generation that breaks away from whirlpool, thereby suppress the influence that the pressure loss caused, improve the overall performance of water-heater heat-exchanging pipe owing to tube fluid.
The 11st kind of water heater helical groove heat exchange pipe that the present invention proposes is, any one water heater in described the 1st kind to the 8th kind invention is with in the helical groove heat exchange pipe, in the pipeline section that is in the fluid outlet near zone, be not provided with jut, promptly this pipeline section inwall is a smooth surface.
At the fluid outlet of water-heater heat-exchanging pipe, because the temperature of fluid is higher, if when fluid was water, the pipeline section inner wall surface might be adhered to incrustation scale.If jut is set, may cause because the existence of jut aggravates the consequence that incrustation scale adheres on the contrary in this zone.Therefore, near the zone that is in the higher fluid issuing of fluid temperature (F.T.), can suppress the generation of incrustation scale by using not with the pipe of jut, such as level and smooth light pipe.
The 12nd kind of water heater helical groove heat exchange pipe that the present invention proposes is, any one water heater in described the 1st kind to the 8th kind invention is with in the helical groove heat exchange pipe, its pipeline section inner wall surface can be the surface of band internal-rib, and the height of described spiral internal-rib is lower than the height H 1 of described jut.
In the low reynolds number zone, the raising that be located among the jut of helical groove heat exchange pipe inner wall surface, tab more helps heat transfer coefficient compared with big jut, therefore, the jut that highly is higher than spiral internal-rib height is set, in the hope of improving heat-transfer effect by the spiral grooved tube inwall; On the other hand, in the high reynolds number zone, the spiral internal-rib that is lower than the jut height more helps the raising of heat transfer coefficient, therefore, in the high reynolds number zone, by using pipeline section inner wall surface spiral internal-rib to be lower than the band spiral internally finned tube of jut height, can further improve the heat transfer property of water heater helical groove heat exchange pipe.
The 13rd kind of water heater helical groove heat exchange pipe that the present invention proposes be, in any one water heater usefulness helical groove heat exchange pipe in described the 1st kind to the 8th kind invention, a plurality of juts can along with the direction setting of tubular axis line parallel.
By jut being set, can recur the augmentation of heat transfer effect along tube axial direction.Simultaneously, because fluid can reduce the increase of the pressure loss along the tube axial direction streamlined flow, improve water-heater heat-exchanging pipe overall performance.
The 14th kind of water heater helical groove heat exchange pipe that the present invention proposes is that in any one water heater usefulness helical groove heat exchange pipe in described the 1st kind to the 8th kind invention, a plurality of juts are with the helical form setting.By jut being set with helical form, the mobile generation of tube fluid is circled round, prolong fluid and in pipe, pass through length, thereby further improve heat transfer property.
The 15th kind of water heater helical groove heat exchange pipe that the present invention proposes is that in any one water heater usefulness helical groove heat exchange pipe in described the 1st kind to the 8th kind invention, a plurality of juts can be arranged on along on the paired position of pipe diameter direction.
By jut being arranged on along on the paired position of pipe diameter direction, can reduce near the cross-sectional area of jut, promote the mixing of fluid, thereby further improve heat transfer property.
The 16th kind of water heater helical groove heat exchange pipe that the present invention proposes be, any one water heater in described the 1st kind to the 8th kind invention is used instead in the helicla flute heat pipe, and the interval P between a plurality of juts can be 0.5～10 with the ratio of heat exchanger tube inside diameter D.
When the ratio of the interval P between jut and heat exchanger tube inside diameter D is 0.5 when following, though can obtain the augmentation of heat transfer effect, in fluid upstream one side, because the influence of jut, the pressure loss can enlarge.And when the ratio of the interval P between jut and heat exchanger tube inside diameter D be 10 when above, the augmentation of heat transfer effect can reduce.
At this, be set at 0.5～10 by ratio with the interval P between jut and heat exchanger tube inside diameter D, both kept the augmentation of heat transfer effect, reduce the increase of the pressure loss again, thereby improve the overall performance of water-heater heat-exchanging pipe.
The 17th kind of water heater helical groove heat exchange pipe that the present invention proposes is that any one water heater in described the 1st kind to the 8th kind invention between described a plurality of juts, also can be provided with the tab of rising height H2 less than 0.5mm with in the helical groove heat exchange pipe.
Though in the low reynolds number zone, big jut more helps the raising of heat transfer coefficient than tab; But in the high reynolds number zone, tab more helps to improve heat transfer coefficient compared with big jut.At this, by between big jut, little jut is set, in the hope of obtaining a kind of complementary effect, that is: in the low zone of Reynolds number, improve heat transfer property by big jut, in the high zone of Reynolds number, then improve heat transfer property, and improve the overall performance of heat exchanger thus by tab.
The 18th kind of water heater helical groove heat exchange pipe that the present invention proposes is that any one water heater in described the 1st kind to the 8th kind invention on the pipeline section inner wall surface, exists the partes glabra that is not provided with jut with in the helical groove heat exchange pipe.
Do not having the planar portions of jut, the cross-sectional area in the heat exchanger tube is maximum.Promptly be provided with jut and do not establishing the variation maximum of the pipeline section inner wall surface shape between the jut, heat transfer property is improved.On the other hand, when there was not planar portions in the heat exchanger tube inner wall surface, it is reduced as the water-heater heat-exchanging bore that its effect will become, and accelerate to obtain the augmentation of heat transfer effect by flow velocity, but the pressure loss in the pipe can become increase.
The 19th kind of water heater helical groove heat exchange pipe that the present invention proposes is, any one water heater in described the 1st kind to the 8th kind invention is with in the helical groove heat exchange pipe, described jut is for by applying external force and form from managing the outside, and form jut at line part, then do not form jut at curve part.
When adopting the mode that applies external force from the outside when the heat exchanger tube inner wall surface forms jut, be generally the pipeline section outside wall surface when presenting depression, can form jut to the pipe inner process in corresponding pipeline section inner wall surface.In addition, in general, heat exchanger tube includes straight line portion and curved portion.And, except that the pipe internal pressure loss that exists straight line portion also to exist, also have the pressure loss owing to the crooked additivity that occurs of pipeline section at the curved portion pipeline section.If the inner wall surface in curved portion is provided with jut again, the pressure loss that the curve part branch has also may further increase; Simultaneously, in the process of carrying out buckling work, at the depression position of heat exchanger tube outside wall surface huge distortion and breakage might take place.Therefore, be provided with jut at the line part pipeline section, and jut be not set at the curve part pipeline section.
The 20th kind of water heater helical groove heat exchange pipe that the present invention proposes is, any one water heater in described the 1st kind to the 8th kind invention is with in the helical groove heat exchange pipe, described jut can be by applying external force and form from managing the outside, on the pipeline section of curve part, in the pipeline section that intersects with flexure plane jut is not set then.
At the curve part of heat exchanger tube, intersect deflection partly for maximum with flexure plane.Therefore, at the curve part of heat exchanger tube, the pipeline section zone that intersects with flexure plane is not provided with jut.For example, when heat exchanger tube is bent by horizontal plane,, jut just is not set in the pipeline section zone that the horizontal plane with curve part intersects.
The 21st kind of water heater helical groove heat exchange pipe that the present invention proposes is, any one water heater in described the 1st kind to the 8th kind invention is with in the helical groove heat exchange pipe, provide second fluid of heat to described fluid for flowing, described heat exchanger tube outside can be provided with second heat exchanger tube; The outside wall surface of described heat exchanger tube contacts with described second heat exchanger tube; Described jut can form at the inside pipe wall face by the extruding outside wall surface, and is formed at the position outside the described heat exchanger tube and the second heat exchanger tube contact site.
At this,, can form depression forming on the corresponding outside wall surface in position of jut with internal face because the jut on the described inside pipe wall face is to form by the extruding outside wall surface.Forming jut with the second heat exchanger tube contact site.In other words, if when the outside wall surface of described heat exchanger tube forms depression, described heat exchanger tube is bad with contacting of second heat exchanger tube, and the heat-transfer effect that brings from second heat exchanger tube can reduce.Therefore, by jut not being set, can prevent to reduce the heat-transfer effect that is brought by second heat exchanger tube in the pipeline section zone that contacts with second heat exchanger tube.
Description of drawings
Fig. 1 is the embodiment overall structure schematic diagram of the heat pump water heater of employing helical groove heat exchange pipe of the present invention.
Fig. 2 is the schematic diagram of the water heat exchanger among Fig. 1.
Fig. 3 is the schematic diagram of the helical groove heat exchange pipe among Fig. 2.
Fig. 4 is the coordinate diagram of mobile Reynolds numerical value in the helical groove heat exchange pipe pipe.
Fig. 5
(a) be the cross sectional side view of helical groove heat exchange pipe.
(b) be the A-A cutaway view of Fig. 5 (a).
(c) be the B-B cutaway view of Fig. 5 (b).
Fig. 6 is experiment 1 result's coordinate diagram.
Fig. 7 is experiment 2 results' coordinate diagram.
Fig. 8 is experiment 3 results' coordinate diagram.
Fig. 9 is experiment 4 results' coordinate diagram.
Figure 10 is the helical groove heat exchange pipe plane of embodiment 1.
Figure 11 is the helical groove heat exchange pipe plane of embodiment 2.
Figure 12
(a) be the helical groove heat exchange pipe plane of embodiment 3.
(b) be the helical groove heat exchange pipe side view of embodiment 3.
Figure 13 is the helical groove heat exchange pipe plane of embodiment 4.
Figure 14 is the helical groove heat exchange pipe plane of embodiment 5.
(a) be the helical groove heat exchange pipe plane of embodiment 5.
(b) be the helical groove heat exchange pipe side view of embodiment 5.
Figure 15 is the helical groove heat exchange pipe plane of embodiment 6.
Figure 16 is the helical groove heat exchange pipe plane of embodiment 7.
Figure 17 is the helical groove heat exchange pipe plane of embodiment 8.
Figure 18 is the helical groove heat exchange pipe plane of embodiment 9.
Figure 19
(a) be the helical groove heat exchange pipe plane of embodiment 10.
(b) be the helical groove heat exchange pipe side view of embodiment 10.
Figure 20 is the helical groove heat exchange pipe plane of embodiment 11.
Figure 21
(a) helical groove heat exchange pipe side view.
(b) high fin heat exchanger tube side view.
(c) decorative pattern shape heat exchanger tube side view.
Symbol description
The 1 heat supply circulatory system
100 heat pump water heaters
2 refrigerant-cycle systems
311 flow inlets
312 water exports
313,413,513,613 juts
315 tab
316,416,516,616 spiral internal-ribs
644 little wing/ribs
The specific embodiment
Below, reach embodiment in conjunction with the accompanying drawings and describe a kind of water heater helical groove heat exchange pipe that the present invention proposes in detail.
Fig. 1 is a kind of embodiment overall structure figure that adopts the heat pump water heater of helical groove heat exchange pipe of the present invention.Among the figure, heat pump water heater has accumulation of heat part 1 and 2 liang of group equipment of heat pump part.Accumulation of heat part 1 is linked in sequence successively by following equipment and constitutes: helical groove heat exchange pipe 31, warm water tube 16, mixing valve 17, the heating tube 18 of running water pipe 11, accumulation of heat water pot 12, water circulating pump 13, feed pipe 3, formation water heat exchanger 30.At this, running water is fed to accumulation of heat water pot 12 by feed pipe 11; By the bottom of water circulating pump 13 water that temperature is lower from accumulation of heat water pot 12, the helical groove heat exchange pipe 31 that offers water heat exchanger 30 heats; Warm water after being heated flows into the top of accumulation of heat water pot; High temperature warm water by discharge through warm water tube 16 on the top of accumulation of heat water pot 12 by mixing valve 17, mixes with the cold water of mixed conduit 19 again; By this mixing valve 17, regulate the temperature of heat supply water, offer the user through heating tube 18 again.
Secondly, heat pump part 2 has refrigerant circulation loop, and this refrigerant circulation loop is by refrigerant pipe 32, and the following equipment that is linked in sequence successively constitutes: compressor 21, water heat exchanger 30, expansion valve 23, air heat exchanger 24.After cold-producing medium process compressor 21 high pressure compressed, be sent to water heat exchanger 30; In water heat exchanger, finish the cold-producing medium of heat exchange,, offer air heat exchanger 24 by expansion valve 23; Behind the heat of cold-producing medium around absorbing, also flow to compressor 21.
Fig. 2 is the schematic diagram of water heat exchanger 30 in the above-mentioned heat pump water heater.As shown in Figure 2, water heat exchanger 30 is made of helical groove heat exchange pipe 31 and refrigerant pipe 31.Oval shape is spiraled in being shaped as of helical groove heat exchange pipe 31 at grade, and forms aquaporin W.Refrigerant pipe 32 is wrapped in the periphery of heat exchanger tube 31 by helical form, forms cooling duct R.And, outer Monday of the side of spiral helical groove heat exchange pipe 31 is set at flow inlet 311, center one side of helical groove heat exchange pipe 31 is set at water export 312.In water heat exchanger 30, the cold-producing medium in the refrigerant pipe 32 flows into 322 from inflow of A22 direction and heat release at cold-producing medium; At cold-producing medium flow export 321 from A21 direction flow out thereafter.The running water of supplying with from the A11 direction at flow inlet 311 places heats by this heat, flows to A12 at water export 312 places after becoming warm water.
Secondly, helical groove heat exchange pipe 31 is described.As shown in Figure 3, forming in the pipeline section inner wall surface of helical groove heat exchange pipe 31 highly is the helicla flute 316 of Hm, and is provided with the jut 313 that a plurality of height are H1 up and down symmetrically at tube axial direction.In Fig. 3,, only express the jut 313 that is arranged on the top from the paper direction.In the present embodiment, the water temperature at heat exchanger tube 31 flow inlets 311 places is set at 10 ℃, the water temperature at water export 312 places and is set at 90 ℃.At this, the discharge in the helical groove heat exchange pipe is 0.8L/min.Simultaneously, best (internal diameter is in the scope of 6mm～12mm) to the external diameter of helical groove heat exchange pipe for 8mm～14mm.
The reynolds number Re that flows in the pipe of helical groove heat exchange pipe 31 as shown in Figure 4, the reynolds number Re at helical groove heat exchange pipe 31 flow inlet places 311 is about 2000, flows in the pipe to be the laminar region.Along with flowing of water, the water and the refrigerant pipe shown in Fig. 2 32 that flow into from inflow entrance 311 carry out heat exchange, and water temperature can raise.Because water temperature rises, the viscosity of water diminishes, and reynolds number Re increases gradually.In Fig. 4, the reynolds number Re at water export 312 places is about 7000, and flowing in the pipe is in from laminar flow to turbulent transition transport zone.At this, for checking helical groove heat exchange pipe 31 pipeline section inner wall surface set a plurality of juts 313 under different situations to the raising of heat transfer property and the influence that the pressure loss caused, the spy carries out following experiment:
(1) experiment 1:
Fig. 5 (a) is the cross sectional side view of helical groove heat exchange pipe 31.In experiment 1, be the pipeline section inner wall surface of 8mm at bore D, being provided with pitch P m is that 10mm, the degree of depth are the helicla flute of Hm, is 15mm by tube axial direction interval P simultaneously, is symmetrical arranged height H 1 up and down and is the jut of 1.0mm.Fig. 5 (b) is the A-A cutaway view of Fig. 5 (a), and Fig. 5 (c) is the B-B cutaway view of Fig. 5 (b).As can be known, jut 313 is by forming from the external compression inner wall surface from Fig. 5 (a) and Fig. 5 (b).Simultaneously, from Fig. 5 (c) as can be known, the cross-sectional view of jut 313 be shaped as ellipse.In addition, also there is the planar portions 31a that does not establish jut in the inner wall surface of helical groove heat exchange pipe 31.
Fig. 6 (a) expression be heat transfer property under following two kinds of situations: promptly in pipe for the laminar region and from the laminar region under the condition of each reynolds number Re in the low reynolds number zone of turbulent region transition, the situation when to adopt the spiral grooved tube of not establishing jut and employing to be provided with spiral internal-rib height H m+ rising height H1 be the spiral grooved tube of 1.2mm.At this, what X-axis was represented is the numerical value of reynolds number Re.Y-axis is represented is to be provided with jut 313 helical groove heat exchange pipes and not establish the nusselt number Nu of helical groove heat exchange pipe of jut and the ratio (Nu/Nuo) of the nusselt number Nuo of smooth tubes.At this, nusselt number has carried out nondimensionalization to fluid transmission performance indications to heat transfer coefficient numerical value from solid wall surface as embodying heat, and its numerical value is big more, and is easy more to the heat transmission of fluid by solid wall surface.Therefore, the ratio of Nu/Nuo is big more, by jut and helicla flute and the heat exchanger tube augmentation of heat transfer effect of bringing is big more.What solid line and dotted line were represented respectively is: be provided with the helical groove heat exchange pipe of jut 313 and be not provided with experimental result under the helical groove heat exchange pipe state of jut.From Fig. 6 (a) as can be known, the heat-transfer effect and the Reynolds number that are not provided with the helical groove heat exchange pipe of jut have nothing to do, and are about 3 times of smooth tubes.And be provided with under height H 1 situation for the jut 313 of 1.2mm, when reynolds number Re is 4000 when following, the effect of the augmentation of heat transfer that obtains by jut 313 is apparent in view; And when reynolds number Re be 4000 when above, the effect by the augmentation of heat transfer that jut 313 obtained is set in the pipeline section inner wall surface is then relatively slowly.
Fig. 6 (b) expression be the situation of change of pipe internal pressure loss under the following situation: promptly in pipe for the laminar region and take place from the laminar region under the condition of each reynolds number Re in the low reynolds number zone that the turbulent region transition transforms, adopt the spiral grooved tube of not establishing jut and adopt to be provided with and manage the situation of change of internal pressure loss when spiral internal-rib height H m+ rising height H1 is the spiral grooved tube of 1.2mm with reynolds number Re.At this, what X-axis was represented is the numerical value of reynolds number Re.Y-axis is represented is the ratio (f/fo) of Fanning friction factor fo that is provided with the Fanning friction factor f of jut 313 helical groove heat exchange pipes 31 and does not establish the smooth tubes of jut.At this, Fanning friction factor is the characteristic of expression pipe internal pressure loss, and its numerical value is big more, and the pressure loss in the pipe is also big more.Therefore, the ratio of f/fo is big more, and the hydraulic losses in the pipe also can become big more.What solid line and dotted line were represented respectively is: be provided with the helical groove heat exchange pipe of jut 313 and be not provided with experimental result under the smooth tubes state of jut.From Fig. 6 (b) as can be known, when reynolds number Re is 7000 when following, the augmenting portion of the pipe internal pressure loss of being brought by the jut 313 that is arranged on the pipeline section inner wall surface can kept stable.
(2) experiment 2
In experiment 2, for the setting height H1 that confirms jut 313 to the influence that the pressure loss caused in heat transfer property and the pipe, under the condition of the height H 1 of adjusting pipeline section inner wall surface jut 313, implemented experiment.Fig. 7 (a) expression be: in bore is the heat exchanger tube of 8mm, be spaced apart 15mm, the heat transfer property when being symmetrical arranged the different jut of height H 1 up and down by tube axial direction.At this, what X-axis was represented is the numerical value of jut 313 height H 1.Y-axis is represented is the ratio (Nu/Nuo) of nusselt number Nuo that is provided with the nusselt number Nu of jut 313 helical groove heat exchange pipes 31 and does not establish the smooth tubes of jut.What solid line and dotted line were represented respectively is: reynolds number Re is the experimental result under 4000 and 2000 states.From Fig. 7 (a) as can be known, when reynolds number Re was 4000 and 2000, it was high more all to be shown as jut 313 height H 1, and the raising of heat transfer property is also remarkable more.
What Fig. 7 (b) represented is: the situation of change of pipe internal pressure loss.At this, X-axis is represented is the ratio (f/fo) of Fanning friction factor fo that is provided with the Fanning friction factor f of jut 313 helical groove heat exchange pipes 31 and is not provided with the smooth tubes of jut.What solid line and dotted line were represented respectively is: reynolds number Re is the experimental result under 4000 and 2000 states.From Fig. 7 (b) as can be known, when reynolds number Re was 4000 and 2000, it was high more all to be shown as jut 313 height H 1, and the pressure loss in the pipe is big more.Particularly, H1 becomes 1.0mm when above, and the increase of pipe internal pressure loss is particularly outstanding.
Fig. 7 (c) expression be: in bore is the heat exchanger tube of 8mm, with 15mm (pressing tube axial direction) at interval, the heat exchanger tube overall performance when being symmetrical arranged the different jut of height H 1 up and down.That is to say, its expression be that heat transfer property is improved and suppresses performance after the pressure loss is taken all factors into consideration.At this, what X-axis was represented is the numerical value of jut height H 1.Y-axis is represented is numerical value after following two kinds of ratios are divided by, that is: with being provided with the Fanning friction factor f of jut heat exchanger tube and not being provided with the ratio (f/fo) of Fanning friction factor fo of the smooth tubes of jut, divided by the nusselt number Nu that is provided with the jut heat exchanger tube with the numerical value after not being provided with the ratio (Nu/Nuo) of nusselt number Nuo of jut smooth tubes.As mentioned above, the ratio of Nu/Nuo is big more, and it is high more that heat transfer property improves degree; The ratio of f/fo is big more, and then the hydraulic losses in the pipe is big more.Therefore, big more with the numerical value of f/fo ratio after divided by Nu/Nuo ratio, can obtain both can improve heat transfer property, the influence to the pipe internal pressure loss that also can suppress to cause simultaneously by jut, thus make water-heater heat-exchanging pipe overall performance be improved.
In Fig. 7 (c), what solid line and dotted line were represented respectively is that reynolds number Re is the experimental result under 4000 and 2000 states.From Fig. 7 (c) as can be known, when reynolds number Re is 2000, when the jut height that is arranged on water-heater heat-exchanging inside pipe wall surface is 0.79mm, be maximum with the numerical value that obtains of f/fo ratio after divided by Nu/Nuo ratio, when the jut height surpassed 2.0mm, its numerical value obviously diminished.That is to say,, when in the scope of height at 0.5mm～1.5mm of jut, can make water-heater heat-exchanging pipe overall performance be improved in the low reynolds number zone.Particularly, the jut height setting is advisable in the scope of 0.5mm～0.79mm.
(3) experiment 3
In experiment 3, not have direct height H 1 with jut 313 as index, but with relative roughness (H1/D) as index.In order to confirm the influence that the pressure loss caused of relative roughness (H1/D), under the condition of adjusting relative coarseness (H1/D), implemented experiment to flowing in heat transfer property and the pipe.What Fig. 8 (a) represented is: when reynolds number Re is 2000 and 4000 states, have the result of the helical groove heat exchange pipe heat transfer property of different relative roughness (H1/D).At this, what X-axis was represented is the numerical value of relative roughness (H1/D).Y-axis is represented be provided with jut 313 helical groove heat exchange pipe 31 nusselt number Nu and do not establish the ratio (Nu/Nuo) of the smooth tubes nusselt number Nuo of jut.From Fig. 8 (a) as can be known, the relative roughness of jut (H1/D) is big more, and heat transfer property improves significantly more.In addition, from the dotted line of Fig. 8 (a) as can be known, under the state of Reynolds number 2000, when relative roughness (H1/D) numerical value is 0.1 when following, by having little effect of augmentation of heat transfer that jut brought.
What Fig. 8 (b) represented is: the situation of change of pipe internal pressure loss.At this, what X-axis was represented is the numerical value of relative roughness (H1/D).Y-axis is represented be provided with jut 313 helical groove heat exchange pipe Fanning friction factor f and be not provided with the ratio (f/fo) of Fanning friction factor fo of the smooth tubes of jut.What solid line and dotted line were represented respectively is: reynolds number Re is the experimental result under 4000 and 2000 states.From Fig. 8 (b) as can be known, when reynolds number Re was 4000 and 2000, it was high more all to be shown as jut 313 height H 1/D, and the pressure loss in the pipe is big more.Particularly, H1/D is 0.12 when above, and the increase of pipe internal pressure loss is particularly outstanding.
Fig. 8 (c) expression be: the result of heat transfer property with helical groove heat exchange pipe of different relative roughness (H1/D).At this, what X-axis was represented is the numerical value of relative roughness (H1/D).Y-axis is represented is numerical value after following two kinds of ratios are divided by, that is: with being provided with the Fanning friction factor f of jut heat exchanger tube and not being provided with the ratio (f/fo) of Fanning friction factor fo of the smooth tubes of jut, divided by the nusselt number Nu that is provided with the jut heat exchanger tube with the numerical value after not being provided with the ratio (Nu/Nuo) of nusselt number Nuo of jut smooth tubes.As mentioned above, the ratio of Nu/Nuo is big more, and heat transfer property improves significantly more; The ratio of f/fo is big more, and then the hydraulic losses in the pipe is also big more.Therefore, big more with the numerical value of f/fo ratio after divided by Nu/Nuo ratio, can obtain to improve heat transfer property, the influence to the pipe internal pressure loss that also can suppress to cause simultaneously by jut, thus make the heat exchanger tube overall performance be improved.From Fig. 8 (c) as can be known, when reynolds number Re is 2000, the relative roughness (H1/D) that is arranged on the jut of heat exchanger tube inner wall surface is 0.1 o'clock, is maximum with f/fo ratio divided by Nu/Nuo ratio, when the relative roughness (H1/D) of jut surpassed 0.20, its numerical value obviously diminished.That is to say,, when in the scope of relative roughness (H1/D) 0.05～0.15 of jut, can make the heat exchanger tube overall performance be improved in low reynolds number Re zone.Particularly, the relative roughness of jut (H1/D) is set in 0.05～0.15 the scope and is advisable.
(4) experiment 4
In experiment 4, not only the height of jut 313 as index, also the ratio (H1/Hm) of the rising height H1 of jut and spiral internal-rib height H m as index.In order to confirm the influence that the pressure loss caused of this relative altitude (H1/Hm), under the condition of adjusting relative altitude (H1/Hm), implemented experiment to flowing in heat transfer property and the pipe.Fig. 9 (a) expression be: when reynolds number Re is 2000 and 4000 states, the result of the heat transfer property during helical groove heat exchange pipe with different relative altitudes (H1/Hm).At this, what X-axis was represented is the numerical value of relative altitude (H1/Hm).Y-axis is represented be provided with jut 313 helical groove heat exchange pipe 31 nusselt number Nu and do not establish the ratio (Nu/Nuo) of the smooth tubes nusselt number Nuo of jut.From Fig. 9 (a) as can be known, the relative altitude of jut (H1/Hm) is big more, and heat transfer property improves significantly more.In addition, from the dotted line of Fig. 9 (a) as can be known, under the state of Reynolds number 2000, when relative altitude (H1/Hm) numerical value is 0.5 when following, by having little effect of augmentation of heat transfer that jut brought.
What Fig. 9 (b) represented is: the situation of change of pipe internal pressure loss.At this, what X-axis was represented is the numerical value of relative altitude (H1/Hm).The Fanning friction factor f of the helical groove heat exchange pipe that is provided with jut 313 31 that Y-axis is represented and be not provided with the ratio (f/fo) of Fanning friction factor fo of the smooth tubes of jut.What solid line and dotted line were represented respectively is: reynolds number Re is the experimental result under 4000 and 2000 states.From Fig. 9 (b) as can be known, when reynolds number Re was 4000 and 2000, the relative altitude (H1/Hm) that all is shown as jut 313d was high more, and the pressure loss in the pipe is big more.Particularly, the relative altitude of jut (H1/Hm) is 1.8 when above, and the increase of pipe internal pressure loss is particularly outstanding.
Fig. 9 (c) expression be: jut has the result of heat exchanger tube overall performance under the situation of different relative altitudes (H1/Hm).At this, what X-axis was represented is the numerical value of relative altitude (H1/Hm).Y-axis is represented is numerical value after following two kinds of ratios are divided by, that is: with being provided with the Fanning friction factor f of jut heat exchanger tube and not being provided with the ratio (f/fo) of Fanning friction factor fo of the smooth tubes of jut, divided by the nusselt number Nu that is provided with the jut heat exchanger tube with the numerical value after not being provided with the ratio (Nu/Nuo) of nusselt number Nuo of jut smooth tubes.From Fig. 9 (c) as can be known, when reynolds number Re is 2000, the relative altitude (H1/Hm) that is arranged on the jut of heat exchanger tube inner wall surface is 1.8 o'clock, is maximum with f/fo ratio divided by Nu/Nuo ratio, when the relative altitude (H1/Hm) of jut surpassed 3.0, its numerical value obviously diminished.That is to say,, when in the scope of relative altitude (H1/Hm) 1.0～3.0 of jut, can make the heat exchanger tube overall performance be improved in low reynolds number Re zone.Particularly, the relative altitude of jut (H1/Hm) is set in 1.0～2.0 the scope and is advisable.
Water heater of the present invention with the various variations of helical groove heat exchange pipe structure by following examples further specify following (among following each embodiment the isoparametric numerical value of interval, gash depth of bore D, spiral spiral internal-rib height H m, jut height H 1, H2 and jut just be used for for example and with, below various values all can be used in the number range of the present invention's each parameter required for protection in claims and the above-mentioned experiment among each embodiment):
Embodiment 1
The structure of the helical groove heat exchange pipe 31 that is adopted among the embodiment 1, as shown in figure 10.Shown in Figure 10 (a), in bore D was the smooth tubes 41 of 8mm, Pm was 10mm by the tube axial direction interval, and being provided with height H m is the spiral internal-rib 416 of 0.5mm.Shown in Figure 10 (b), be spaced apart 15mm by tube axial direction, be arranged with height H 1 up and down and be the jut 413 of 1mm.At this, set different value by interval (P1) and spiral fluted pitch (Pm) to most juts, jut and helicla flute are arranged on nonoverlapping position, thus but the rapid increase of killer tube internal pressure loss.
Embodiment 2
In the helical groove heat exchange pipe 51 of present embodiment 2, as shown in figure 11, be between the jut 513 of 1.0mm in height H 1, be provided with height H 2 and be the tab 515 of 0.3mm.Among the figure, 516 is helicla flute, and 51a is a partes glabra.Though in the low reynolds number zone, big jut more helps to improve heat transfer coefficient than little jut,, then be that little jut more helps to improve heat transfer coefficient than big jut in the high reynolds number zone.At this, by being the tab 515 of 0.3mm between the jut 513 of 1.0mm height H 2 being set in height H 1, just can obtain a kind of effect that complements each other, that is: in the Reynolds number lower region, improve heat transfer property by helicla flute 516 and jut 513, in the Reynolds number upper zone, then improve heat transfer property, and the heat exchanger overall performance is improved by helicla flute 516 and tab 515.
Embodiment 3
As shown in figure 12, the helical groove heat exchange pipe 61 that is adopted among the embodiment 3 is provided with jut 613 on the inside pipe wall surface along spiral C1.Figure 12 (a) is the plane of helical groove heat exchange pipe 61, and Figure 12 (b) is the side view of helical groove heat exchange pipe 61.At this, the height H of jut 613 1 is that the interval P2 of 6mm, tube axial direction is 6mm for the interval P1 of 1.0mm, circumferencial direction.
Embodiment 4
As shown in figure 13, the helical groove heat exchange pipe 63 that is adopted in embodiment 4 is, in being provided with the heat exchanger tube of helicla flute 636 that the degree of depth is 0.5mm, comprising the regional 63a that is provided with jut 633 and is not provided with the even surface zone 63b of jut.At this, the even surface zone 63b that is not provided with jut is near the zone that is positioned at water export 632.Near the water export 632 of heat exchanger tube 63, higher as the temperature of the water of fluid, might on tube wall, form incrustation scale.If jut is set, then may aggravate adhering to of incrustation scale in such zone.Therefore, to being near the regional 63b the higher water export of water temperature 632, can suppress the generation of incrustation scale by jut is not set.
Embodiment 5
As shown in figure 14, being characterized as of the helical groove heat exchange pipe that adopts 64 among the embodiment 5: be provided with highly to the spiral internal-rib 646 of 0.5mm and highly be the inwall of little wing/rib 644 of 0.2mm, be spaced apart 15mm by tube axial direction, be arranged with height H 1 up and down and be the jut 643 of 1.0mm.At this, spiral internal-rib 646 represents with heavy line, and little wing/rib 644 is represented with fine line.By jut 643 is set in the pipe that has little wing/rib 644, can obtain to establish the effect of being brought that complements each other altogether, to improve the heat exchanger tube overall performance by spiral internal-rib 646, little wing/rib 644 and jut 643.
Embodiment 6
As shown in figure 15, at embodiment 6 employed helical groove heat exchange pipes 65, constitute by regional 65a and regional 65b.At near the regional 65b that is in the water export 652, adopt the helical groove heat exchange pipe that is not provided with jut, other regional 65a is in the trough of belt pipe of little wing/rib 654 of 0.2mm being provided with highly to the helicla flute 656 of 0.5mm and the degree of depth, is provided with highly to be the jut 653 of 1.0mm.Spiral internal-rib 656 is with heavy line, and little wing/rib 654 is represented with fine line.Thus, both can obtain to establish the effect of being brought that complements each other altogether: promptly improve the heat exchanger tube overall performance by spiral internal-rib 656, little wing/rib 654 and jut 653.
Embodiment 7
As shown in figure 16, the helical groove heat exchange pipe 66 in that embodiment 7 is adopted is made of three zones such as regional 66a, regional 66b, regional 66c.For interior reynolds number Re is lower than 4000 regional 66a from flow inlet 661 to pipe, adopt the water-heater heat-exchanging pipe of following feature, that is: be provided with highly to the spiral internal-rib 666 of 0.5mm and highly be in the pipe of little wing/rib 664 of 0.2mm, be provided with and highly be the jut 663 of 1.0mm; To being near the regional 66c the water export 662, adopting and being provided with highly is the spiral grooved tube of the spiral internal-rib 666 of 0.5mm; Between regional 66a and regional 66c, adopt to be provided with highly to the spiral internal-rib 666 of 0.5mm and highly to be the heat exchanger tube 66b of little wing/rib 664 of 0.2mm.At this, spiral internal-rib 666 is with heavy line, and little wing/rib 664 is represented with fine line.Thus, obtain a kind of effect that complements each other: in the Reynolds number lower region, improve heat transfer property by jut 663 and little wing/rib 664 with spiral internal-rib 666, in the Reynolds number upper zone, then improve heat transfer property, thereby the overall performance of heat exchanger is improved by little wing/rib 664 and spiral internal-rib 666.Simultaneously, among the high water export 662 near zone 66c, also can suppress the generation of incrustation scale by spiral internal-rib 666.
Embodiment 8
As shown in figure 17, the heat exchanger tube 67 in that embodiment 8 is adopted is made of three zones such as regional 67a, regional 67b, regional 67c.Be lower than 4000 regional 67a for reynolds number Re in from flow inlet 671 to pipe, adopt to be provided with highly to the spiral internal-rib 676 of 0.5mm and highly to be the heat exchanger tube of the jut 673 of 1.0mm; To being near the regional 67c the water export 672, adopting and being provided with highly is the helical groove heat exchange pipe of the spiral internal-rib 676 of 0.5mm; Between regional 67a and regional 67c, adopt to be provided with highly to the spiral internal-rib 676 of 0.5mm and highly to be the heat exchanger tube 67b of little wing/rib 674 of 0.2mm.At this, spiral internal-rib 676 is with heavy line, and little wing/rib 674 is represented with fine line.Thus, can obtain a kind of effect that complements each other, that is: in the Reynolds number lower region, improve heat transfer property by spiral internal-rib 676 and jut 673, in the Reynolds number upper zone, then improve heat transfer property, thereby the overall performance of heat exchanger is improved by spiral internal-rib 676 and little wing/rib 674.Simultaneously, in the higher water export 672 near zone 67c of water temperature, also can suppress the generation of incrustation scale by spiral internal-rib 676.
Embodiment 9
As shown in figure 18, being characterized as of the helical groove heat exchange pipe 68 that in embodiment 9, is adopted: in line part 684 pipes, be provided with jut 683, but in curve part B1～B7 (frame of broken lines part among the figure) pipe, do not establish jut.Like this, both can avoid owing to the increase that the pipe internal pressure loss that jut causes is set in curve part B1～B7 pipeline section inner wall surface, and also can avoid extensive distortion and damaged takes place in implementing the buckling work process, 686 is the spiral internal-rib among the figure, 681 is flow inlet, and 682 is water export.
Embodiment 10
The plane of the helical groove heat exchange pipe 69 that Figure 19 (a) is adopted for embodiment 10, Figure 19 (b) then is the side view of helical groove heat exchange pipe 69.At this, be provided with jut 693 at the pipeline section inwall of line part 694, and at curve part C-C place, at the pipeline section inwall 695 that intersects with flexure plane S1 jut is not set, 696 is the spiral internal-rib among the figure, and 691 is flow inlet, and 692 is water export.
Embodiment 11
As shown in figure 20, being characterized as of the helical groove heat exchange pipe 70 that is adopted in embodiment 11 do not established jut in the outside wall surface 71 of helical groove heat exchange pipe and the contact site of refrigerant pipe 72.If be provided with depression with the corresponding heat exchanger tube outside wall surface in the winding position of refrigerant pipe 72, then the loose contact of refrigerant pipe 72 and heat exchanger tube outside wall surface 71 might reduce from the heat-transfer effect of refrigerant pipe 72.Therefore, by in not twining the heat exchanger tube pipeline section position of refrigerant pipe 72, jut 713 being set, can prevent to make reduction from the heat-transfer effect of refrigerant tube 72.
Other
In above-mentioned experiment and embodiment, shown in Figure 21 (a), adopted the heat exchanger tube that in having the spiral fluted helical groove heat exchange pipe, is provided with jut.In addition, can adopt the heat exchanger tube that on high fin pipe, is provided with jut shown in Figure 21 (b), also can adopt the heat exchanger tube that on flower-shaped pipe, is provided with jut shown in Figure 21 (c).

Claims (21)

1. a helical groove heat exchange pipe that is used for water heater carries out heat exchange inside and outside pipe, it is characterized in that:
Be provided with the spiral internal-rib in the pipe;
Be lower than the pipeline section inner wall surface of at least a portion in 7000 zones at the reynolds number Re that is in tube fluid, be provided with a plurality of juts, the height H 1 of this jut is 0.5mm～1.5mm.
2. a helical groove heat exchange pipe that is used for water heater carries out heat exchange inside and outside pipe, it is characterized in that:
Be provided with the spiral internal-rib in the pipe;
Be lower than the pipeline section inner wall surface of at least a portion in 7000 zones at the reynolds number Re that is in tube fluid, be provided with a plurality of juts, the height H 1 of this jut is H1: D=1 with the ratio of inside diameter D: 0.05～0.15.
3. a helical groove heat exchange pipe that is used for water heater carries out heat exchange inside and outside pipe, it is characterized in that:
Be provided with the spiral internal-rib in the pipe;
Being in the pipeline section inner wall surface that the Reynolds number of tube fluid (Re) is lower than at least a portion in 7000 zones, be provided with a plurality of juts, the height H 1 of this jut with the ratio of spiral internal-rib height H m is:
H1∶Hm＝1∶1～3。
4. a helical groove heat exchange pipe that is used for water heater carries out heat exchange inside and outside pipe, it is characterized in that:
Be provided with the spiral internal-rib in the pipe;
Be lower than the pipeline section inner wall surface of at least a portion in 7000 zones at the Reynolds R that is in tube fluid, be provided with a plurality of juts, the interval (P1) between described a plurality of juts is a different value with described spiral fluted slot pitch Pm.
5. a helical groove heat exchange pipe that is used for water heater uses on the heat exchanger of water heater, and carry out heat exchange inside and outside pipe, it is characterized in that:
Be provided with the spiral internal-rib in the pipe;
Fluid mobile in pipe is a water, and near the pipeline section inner wall surface that is in the fluid inlet place, is provided with a plurality of juts, and the height H 1 of this jut is 0.5mm～1.5mm.
6. a helical groove heat exchange pipe that is used for water heater uses on the heat exchanger on the water heater, and carry out heat exchange inside and outside pipe, it is characterized in that:
Be provided with the spiral internal-rib in the pipe;
Fluid mobile in pipe is a water, and near the pipeline section inner wall surface that is in the fluid inlet place, is provided with a plurality of juts, and the height H 1 of this jut with the ratio of inside diameter D is: H1: D=1: 0.05～0.15.
7. a helical groove heat exchange pipe that is used for water heater uses on the heat exchanger on the water heater, and carry out heat exchange inside and outside pipe, it is characterized in that:
Be provided with the spiral internal-rib in the pipe;
Fluid mobile in pipe is a water, and near the pipeline section inner wall surface that is in the fluid inlet place, is provided with a plurality of juts, and the height H 1 of this jut is H1: Hm=1 with the ratio of spiral internal-rib height H m: 1～3.
8. a helical groove heat exchange pipe that is used for water heater uses on the heat exchanger on the water heater, and carry out heat exchange inside and outside pipe, it is characterized in that:
Be provided with the spiral internal-rib in the pipe;
Fluid mobile in pipe is a water, and near the pipeline section inner wall surface that is in the fluid inlet place, is provided with a plurality of juts, and interval P1 between described a plurality of juts and described spiral fluted slot pitch Pm are different value.
9. according to claim 1,2,3,4,5,6,7 or 8 described a kind of helical groove heat exchange pipes that are used for water heater, it is characterized in that:
The flow rate of fluid that flows in described pipe is 0.1m/s～0.6m/s.
10. according to claim 1,2,3,4,5,6,7 or 8 described a kind of helical groove heat exchange pipes that are used for water heater, it is characterized in that:
The shape of cross section of described jut is: circle, ellipse or the shape of being made up of the smoothed curve of sub-circular.
11., it is characterized in that according to claim 1,2,3,4,5,6,7 or 8 described a kind of helical groove heat exchange pipes that are used for water heater:
At the pipeline section inwall that is in the fluid outlet near zone is smooth surface.
12., it is characterized in that according to claim 1,2,3,4,5,6,7 or 8 described a kind of helical groove heat exchange pipes that are used for water heater:
The height of described internal-rib is lower than the height H 1 of described jut.
13., it is characterized in that according to claim 1,2,3,4,5,6,7 or 8 described a kind of helical groove heat exchange pipes that are used for water heater:
Establish described a plurality of jut on described pipeline section inwall edge with the direction of tubular axis line parallel.
14., it is characterized in that according to claim 1,2,3,4,5,6,7 or 8 described a kind of helical groove heat exchange pipes that are used for water heater:
Establish described a plurality of jut at described pipeline section inwall along the hand of spiral.
15., it is characterized in that according to claim 1,2,3,4,5,6,7 or 8 described a kind of helical groove heat exchange pipes that are used for water heater:
Described pipeline section inwall is established described a plurality of jut along the paired position of pipe diameter direction.
16., it is characterized in that according to claim 1,2,3,4,5,6,7 or 8 described a kind of helical groove heat exchange pipes that are used for water heater:
Interval L between described a plurality of jut with the ratio of inside diameter D is:
LD＝0.5～10。
17., it is characterized in that according to claim 1,2,3,4,5,6,7 or 8 described a kind of helical groove heat exchange pipes that are used for water heater:
Between described a plurality of juts, also be provided with the tab of rising height H2 less than 0.5mm.
18., it is characterized in that according to claim 1,2,3,4,5,6,7 or 8 described a kind of helical groove heat exchange pipes that are used for water heater:
On described pipeline section inner wall surface, the one section inside pipe wall that is between two sections inwalls that are provided with jut is an even surface.
19., it is characterized in that according to claim 1,2,3,4,5,6,7 or 8 described a kind of helical groove heat exchange pipes that are used for water heater:
Described jut is by applying external force and form from managing the outside, and is provided with described jut at line part pipeline section inwall, is even surface at curve part pipeline section inwall.
20., it is characterized in that according to claim 1,2,3,4,5,6,7 or 8 described a kind of helical groove heat exchange pipes that are used for water heater:
Described jut is by applying external force and form from managing the outside, and the pipeline section inwall that intersects with flexure plane on the pipeline section of curve part is an even surface.
21., it is characterized in that according to claim 1,2,3,4,5,6,7 or 8 described a kind of helical groove heat exchange pipes that are used for water heater:
The described helical groove heat exchange pipe outside that is used for water heater is provided with second heat exchanger tube, and second fluid and the described fluid that flow in described second heat exchanger tube carry out heat exchange,
The described outside wall surface that is used for the helical groove heat exchange pipe of water heater contacts with described second heat exchanger tube,
Jut on the described inside pipe wall face is to form by pushing outside wall surface, and describedly is used for the helical groove heat exchange pipe of water heater and the inner tubal wall of the second heat exchanger tube contact position is an even surface.
CNA2006101130277A 2006-09-08 2006-09-08 Helical groove heat exchange pipe for water heater Pending CN1924507A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
CNA2006101130277A CN1924507A (en) 2006-09-08 2006-09-08 Helical groove heat exchange pipe for water heater
US12/440,186 US20090250198A1 (en) 2006-09-08 2007-08-24 Hot water corrugated heat transfer tube
EP07792965A EP2071266A4 (en) 2006-09-08 2007-08-24 Corrugated heat exchanger tube for hot water supply
AU2007292663A AU2007292663B2 (en) 2006-09-08 2007-08-24 Hot water corrugated heat transfer tube
PCT/JP2007/066436 WO2008029639A1 (en) 2006-09-08 2007-08-24 Corrugated heat exchanger tube for hot water supply
JP2008533094A JP4768029B2 (en) 2006-09-08 2007-08-24 Corrugated heat transfer tube for hot water supply
KR1020097006255A KR20090055604A (en) 2006-09-08 2007-08-24 Corrugated heat exchanger tube for hot water supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2006101130277A CN1924507A (en) 2006-09-08 2006-09-08 Helical groove heat exchange pipe for water heater

Publications (1)

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CN1924507A true CN1924507A (en) 2007-03-07

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CNA2006101130277A Pending CN1924507A (en) 2006-09-08 2006-09-08 Helical groove heat exchange pipe for water heater

Country Status (7)

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US (1) US20090250198A1 (en)
EP (1) EP2071266A4 (en)
JP (1) JP4768029B2 (en)
KR (1) KR20090055604A (en)
CN (1) CN1924507A (en)
AU (1) AU2007292663B2 (en)
WO (1) WO2008029639A1 (en)

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AU2007292663A1 (en) 2008-03-13
KR20090055604A (en) 2009-06-02
AU2007292663B2 (en) 2010-08-12
JP4768029B2 (en) 2011-09-07
EP2071266A4 (en) 2013-01-23
US20090250198A1 (en) 2009-10-08
JPWO2008029639A1 (en) 2010-01-21
WO2008029639A1 (en) 2008-03-13

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