CN101144693A - Fin-tube type heat exchanger - Google Patents

Fin-tube type heat exchanger Download PDF

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Publication number
CN101144693A
CN101144693A CN 200710031019 CN200710031019A CN101144693A CN 101144693 A CN101144693 A CN 101144693A CN 200710031019 CN200710031019 CN 200710031019 CN 200710031019 A CN200710031019 A CN 200710031019A CN 101144693 A CN101144693 A CN 101144693A
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CN
China
Prior art keywords
heat exchanger
fin
center
metal tube
type heat
Prior art date
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Pending
Application number
CN 200710031019
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Chinese (zh)
Inventor
黄晓峰
闫志恒
廖清高
刘丽刚
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Hisense Home Appliances Group Co Ltd
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Hisense Kelon Electrical Holdings Co Ltd
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Priority to CN 200710031019 priority Critical patent/CN101144693A/en
Publication of CN101144693A publication Critical patent/CN101144693A/en
Pending legal-status Critical Current

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    • 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0477—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
    • 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D2001/0253—Particular components
    • F28D2001/026—Cores
    • F28D2001/0273—Cores having special shape, e.g. curved, annular

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

Abstract

The invention provides a pipe fin type heat exchanger, which comprises a plurality of metal pipes, a fin sleeved on the outer side of the metal pipe, a heat exchanger stoss face formed on one side of the fin, and a heat exchanger lee side formed on the other side of the fin, wherein, the interval of the center of the metal pipe and the heat exchanger stoss face is larger than the interval of the center of the metal pipe and the heat exchanger lee side. The offset of the metal pipe center and the fin center is 0.5-3.0 mm. The pipe fin type heat exchanger strengthens the whole heat exchange effect, the heat exchange quantity is improved, thereby optimizing an air-conditioning system, and the refrigerating / heating energy efficiency ratio of the air-conditioning system is improved.

Description

A kind of fin-tube type heat exchanger
Technical field
The present invention relates to technical field of heat exchangers, be specifically related to the technical field of fin-tube type heat exchanger.
Background technology
Current, air-conditioner energy-conservation more and more is subjected to people and pays close attention to, and the efficiency that improves heat exchanger then becomes the key in the energy-conservation link of air-conditioner.For improving the efficiency of air-conditioner, generally measure such as the heat exchange area of employing increase heat exchanger, increasing air quantity, but these measures have increased the cost of air-conditioner itself, the economy that has hindered air-conditioner to use.
Find that in the research of fin-tube type heat exchanger air side heat exchange resistance accounts for about 80% of whole heat exchanger thermal resistance, so the reinforcement of air side performance always is the emphasis of research, comes enhanced heat exchange as adopting structures such as window, bridge sheet.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of fin-tube type heat exchanger efficiently, by changing the relative position of fin and metal tube, improve fin surface temperature field and flow field, reach and improve fin heat exchange effect, thereby improve the heat exchange efficiency of whole heat exchanger.
Technical scheme of the present invention is: a kind of fin-tube type heat exchanger, comprise the number of metal pipe, be sleeved on the fin in the metal tube outside, one side of fin forms the heat exchanger windward side, opposite side forms the heat exchanger lee face, wherein, the spacing of the center of metal tube and heat exchanger windward side is greater than the center of metal tube and the spacing of heat exchanger lee face.
Described fin-tube type heat exchanger, fin width are 9～22mm.
Described metal tube center and fin center offset are 0.5～3.0mm.
Sometimes, also will carry out bending operation according to the needs of installation site after the machine-shaping of fin-tube type heat exchanger process expand tube, so heat exchanger windward side and lee face all are interpreted as the face of broad sense, and be not only the plane.
The fin-tube type heat exchanger that described fin is processed into is U-shaped or L shaped or in-line along fin vertical direction cross sectional shape, or the heat exchanger cross sectional shape is the combination of above one or more cross sectional shapes.
Compared with prior art, beneficial effect of the present invention is, skew by the metal tube center, realize that metal tube position in fin is offset to the heat exchanger leeward side, changed the heat transfer property and the resistance performance of fin-tube type heat exchanger air side, reduced the velocity wake region behind the pipe, heat transfer efficiency is increased, make distribution of exit velocities more inhomogeneous simultaneously, cause the corresponding increase of resistance.The resultant effect that heat transfer improves and resistance increases is to have strengthened whole heat exchange effect, has improved the heat exchange amount, thereby optimizes air-conditioning system, improves the Energy Efficiency Ratio (EER/COP) of air-conditioning system refrigerating/heating.
Description of drawings
Fig. 1 is a fin-tube type heat exchanger stereogram of the present invention;
Fig. 2 is fin of the present invention and metal tube relative position schematic diagram;
Fig. 3 is the schematic diagram of relative fin center, metal tube of the present invention center skew.
The specific embodiment
Below in conjunction with accompanying drawing and the present invention is further illustrated:
A kind of fin-tube type heat exchanger as shown in Figure 1, comprise number of metal pipe 1, be sleeved on the fin 2 in metal tube 1 outside and the end plate 3 of sealing heat exchanger two-port, one side of fin 2 forms heat exchanger windward side 4, opposite side forms heat exchanger lee face 5, wherein, the spacing of the center 12 of metal tube 1 and heat exchanger windward side 4 is greater than the center 12 of metal tube 1 and the spacing of heat exchanger lee face 5.
In order to obtain higher heat exchange efficiency, above-mentioned metal tube 1 center 12 is 0.5～3.0mm with fin 2 centers 11 side-play amounts.
In the described fin-tube type heat exchanger, fin width is 9～22mm.
Sometimes, also will carry out bending operation according to the needs of installation site after the machine-shaping of fin-tube type heat exchanger process expand tube, so heat exchanger windward side and lee face all are interpreted as the face of broad sense, and be not only the plane.
The fin-tube type heat exchanger that described high-efficiency fin is processed into is U-shaped or L shaped or in-line along fin vertical direction cross sectional shape, or the heat exchanger cross sectional shape is the combination of above one or more cross sectional shapes.
Be the explanation effect that the present invention reached, enumerated several embodiments of the present invention below:
1, complete machine embodiment
Adopt conventional pipe heat exchanger and pipe heat exchanger of the present invention, wherein, conventional pipe heat exchanger refers to that the metal tube center is positioned at the heat exchanger of fin center, pipe heat exchanger of the present invention refers to the heat exchanger of metal tube center skew leeward side, it is made into single curved row's bellows-shaped respectively, thereby as air conditioner chamber's external condenser, the assembling air conditioner.By GB/T7725-2004[4] carry out the specified refrigeration test of air-conditioning in the room air conditioner experimental test chamber (air enthalpy method) built up, working temperature is indoor 27/19 ℃, outdoor 35/24 ℃.
According to relative fin center, metal tube center to heat exchanger leeward side side-play amount be-2mm ,-1mm, 0mm, 1mm, 2mm, make condenser 6, condenser 7, condenser 8, condenser 9, condenser 10.
The air conditioner experiment selects for use two cover 1.5P air-conditioners as experiment 1# model machine, 2# model machine, under the situation of only changing condenser, tests the refrigeration performance of two cover model machines respectively; Experimental result is listed in table 1 respectively.
The 1# model machine The 2# model machine
Adopt condenser Condenser 6 Condenser 7 Condenser 8 Condenser 9 Condenser 10 Condenser 6 Condenser 7 Condenser 8 Condenser 9 Condenser 10
Refrigerating capacity (W) 3050 3109 3101 3148 3129 3056 3142 3124 3180 3174
Power (W) 1239.8 1251.6 1249.1 1258.4 1250.9 1253 1252 1250.2 1252.7 1245.9
EER 2.46 2.484 2.483 2.502 2.501 2.439 2.51 2.499 2.539 2.548
Table 1
As shown in table 1, by the system test result as can be known, the condenser that adopts the metal tube center to move to leeward lateral deviation, refrigeration is better, and heat exchange effect that promptly should the series condenser is better, explanation according to this, the heat exchanger that the metal tube center just is being offset to leeward side, its heat exchange efficiency is higher relatively.
2, heat exchanger experiment porch embodiment
Conventional pipe heat exchanger and pipe heat exchanger of the present invention are made into single curved heat exchanger (condenser) of arranging bellows-shaped respectively, on the heat exchanger experiment porch, carry out the performance comparison experiment.
According to relative fin center, metal tube center to the side-play amount of heat exchanger leeward side be-2mm ,-1mm, 0mm, 1mm, 2mm, make condenser 6, condenser 7, condenser 8, condenser 9, condenser 10 respectively.
Experimental program: the condensation temperature of above-mentioned condenser 6,7,8,9,10 is made as 48 ℃, 50 ℃, 52 ℃ respectively, and the inlet temperature of condenser 6,7,8,9,10 is made as 79 ℃, 81 ℃, 84 ℃ respectively, and degree of supercooling is 6 ℃; Environment dry-bulb temperature is 35 ℃, and wet-bulb temperature is 24 ℃; The test air quantity is 2000m 3/ h.
Draw experimental result as table 2
Table 2
By the experimental result of table 2 as can be seen, the heat exchange amount of condenser 9 and condenser 10 is obviously higher, explanation according to this, and the heat exchanger that the metal tube center just is being offset to leeward side, its heat exchange efficiency is better.
3, heat exchanger numerical simulation study embodiment
The present embodiment is still carried out numerical value research to the performance of heat exchanger (condenser) that relative fin center has a metal tube center of different side-play amounts.
The calculating of this numerical value research is based on the condenser heat transfer model, and in whole diabatic process, cold-producing medium is emitted heat and led to fin by metal pipe-wall heat conduction in metal tube, finally by the convection current of air heat is taken away.Because the heat transfer of cold-producing medium in metal tube is very complicated, relates to overheated zone, two-phase section and cross the cold-zone.This research is main to be fixed the thermal resistance in the metal tube in order to study the heat transfer property of air side fins in different die side-play amounts, and promptly the metal pipe-wall temperature is taken as definite value (first kind thermal boundary condition), and its value is taken as the mean value of metal pipe-wall temperature in the experiment.Can choose typical Representative Volume Element in calculating based on this and study, owing to consider Temperature Distribution in the fin in calculating, promptly the temperature in the fin is determined by calculating, and therefore makes this problem belong to the solid coupled problem of stream.To flowing of velocity air, the simplification below also introducing under the not too big situation of the temperature difference:
(1) fluid flows and heat exchange is the laminar flow steady flow in the supposition passage; (2) ignore the influence of the moving and heat exchange of gravity convection; (3) air is an incompressible fluid; (4) physical parameter of air and fin is a constant.The fin that adopts in the research and the three-dimensional dimension of heat-exchanger model are as follows: fin thickness 0.105mm, spacing of fin 1.4 mm, fin width 21.65mm, heat exchanger front face area 582mm * 500mm, tube pitch 25mm.
The metal tube center of now investigating heat exchanger has the situation of different side-play amounts and airflow on surface flow condition and the heat transfer characteristic under the different wind speed at 8 kinds of relative fin centers, the windward side flow velocity of being studied is respectively 1.0m/s, 1.5m/s, 1.89m/s, 2.0m/s, 3.0m/s.In the relative fin of being studied in metal tube center the side-play amount of mind-set heat exchanger leeward side be respectively-2mm ,-1.5mm ,-1mm, 0mm, 1mm, 1.5mm, 2mm, 3mm.
For representing conveniently, the offset-lists of mind-set heat exchanger leeward side in the relative fin in above-mentioned metal tube center is shown in the table 3.In addition, list in table 4 and the table 5 with pairing resistance of different wind speed and heat exchange amount under the different offset manner.
The offset direction The metal tube center is moved to leeward lateral deviation
Side-play amount mm -2 -1.5 -1.0 0 1.0 1.5 2 3
The expression mode UP_2.0 UP_1.5 UP_1.0 BS_0 DN_1.0 DN_1.5 DN_2.0 DN_3.0
Table 3
Windward side flow velocity m/s UP_2.0 UP_1.5 UP_1.0 BS_0 DN_1.0 DN_1.5 DN_2.0 DN_3.0
1.000 6.335 6.383 6.431 6.523 6.591 6.629 6.667 6.75
1.500 11.363 11.448 11.525 11.671 11.782 11.847 11.916 12.063
1.890 16.140 16.210 16.280 16.510 16.640 16.710 16.820 17.02
2.500 25.167 25.306 25.258 25.654 25.824 25.932 26.069 26.36
3.000 33.278 33.858 33.719 34.244 34.407 34.537 34.724 35.115
Resistance is with change of wind velocity (resistance unit: Pa) under the different side-play amounts of table 4
Windward side flow velocity (m/s) UP_2.0 UP_1.5 UP_1.0 BS_0 DN_1.0 DN_1.5 DN_2.0 DN_3.0
1.000 0.21185 0.21287 0.21502 0.21634 0.21744 0.21800 0.21855 0.21525
1.500 0.26722 0.26942 0.27168 0.27372 0.27490 0.27474 0.27453 0.27059
1.890 0.30370 0.30602 0.30821 0.31100 0.31580 0.31668 0.31750 0.3036
2.500 0.34594 0.34920 0.35163 0.35512 0.35631 0.35615 0.35592 0.34685
3.000 0.37658 0.37837 0.38349 0.38711 0.38824 0.38880 0.38937 0.37638
The heat exchange amount is with change of wind velocity (heat exchange amount unit: W) under the different side-play amounts of table 5
Show that by table 4 and table 5 along with the increase of head-on wind flow velocity, heat exchanger resistance and heat output all increase, and the degree that resistance increases to be higher than the degree of conducting heat and increasing; Simultaneously, along with the metal tube center is moved to leeward lateral deviation, the resistance of fin increases gradually.And with regard to the heat exchange amount, along with moving to leeward lateral deviation the metal tube center, the heat exchange amount of fin increases earlier and then reduces, accordingly, its turning point is optimum side-play amount, and compare with conventional pipe heat exchanger this moment, resistance approximately increases by 1～2%, and corresponding heat exchange amount increases by 1～2%.
By above embodiment, from theory and the influence of in fact analyzing the heat exchange property of the skew heat exchanging device of having examined the metal tube center, its result is consistent basically respectively; The heat exchange efficiency of the heat exchanger that to be the metal tube center just be offset to leeward side is higher; Accordingly, along with the difference of side-play amount, heat exchange efficiency is also different; Draw by research, for the heat exchanger fin that common air-conditioning is used, sheet is wide between 9～22mm, and when side-play amount during at 0.5～3.0mm, the heat exchange efficiency of fin is higher relatively.

Claims (4)

1. fin-tube type heat exchanger, comprise the number of metal pipe, be sleeved on the fin in the metal tube outside, one side of fin forms the heat exchanger windward side, opposite side forms the heat exchanger lee face, and it is characterized in that: the spacing of the center of metal tube and heat exchanger windward side is greater than the center of metal tube and the spacing of heat exchanger lee face.
2. fin-tube type heat exchanger according to claim 1 is characterized in that: the center of described metal tube and the center offset of fin are 0.5～3.0mm.
3. fin-tube type heat exchanger according to claim 1 and 2 is characterized in that: fin width is 9～22mm.
4. fin-tube type heat exchanger according to claim 1 and 2, it is characterized in that: the fin-tube type heat exchanger that described fin is processed into is U-shaped or L shaped or in-line along fin vertical direction cross sectional shape, or the heat exchanger cross sectional shape is the combination of above one or more cross sectional shapes.
CN 200710031019 2007-10-23 2007-10-23 Fin-tube type heat exchanger Pending CN101144693A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102607157A (en) * 2012-04-18 2012-07-25 广东志高空调有限公司 Outdoor heat exchanger of air conditioner
CN106197121A (en) * 2016-08-23 2016-12-07 浙江宜清环境技术有限公司 A kind of gas-liquid heat-exchange heat transfer structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102607157A (en) * 2012-04-18 2012-07-25 广东志高空调有限公司 Outdoor heat exchanger of air conditioner
CN106197121A (en) * 2016-08-23 2016-12-07 浙江宜清环境技术有限公司 A kind of gas-liquid heat-exchange heat transfer structure

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Open date: 20080319