EP1439361A1 - Echanegeur de chaleur à évaporation avec tubes profilés faiblement ou pas du tout ailettés - Google Patents

Echanegeur de chaleur à évaporation avec tubes profilés faiblement ou pas du tout ailettés Download PDF

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Publication number
EP1439361A1
EP1439361A1 EP03250233A EP03250233A EP1439361A1 EP 1439361 A1 EP1439361 A1 EP 1439361A1 EP 03250233 A EP03250233 A EP 03250233A EP 03250233 A EP03250233 A EP 03250233A EP 1439361 A1 EP1439361 A1 EP 1439361A1
Authority
EP
European Patent Office
Prior art keywords
water
streamline
heat exchanger
cooling fins
coil
Prior art date
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.)
Withdrawn
Application number
EP03250233A
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German (de)
English (en)
Inventor
Ho Hsin Wu
Charles Y. Dean
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.)
Air Tech Co Ltd
Original Assignee
Air Tech Co 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 Air Tech Co Ltd filed Critical Air Tech Co Ltd
Priority to EP03250233A priority Critical patent/EP1439361A1/fr
Publication of EP1439361A1 publication Critical patent/EP1439361A1/fr
Withdrawn legal-status Critical Current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
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
    • F28B1/06—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using air or other gas as the cooling medium
    • 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
    • F28D5/00—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, using the cooling effect of natural or forced evaporation
    • F28D5/02—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, using the cooling effect of natural or forced evaporation in which the evaporating medium flows in a continuous film or trickles freely over the conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/02—Streamline-shaped elements

Definitions

  • the heat exchangers of cooling medium condensing apparatuses conventionally include three types, namely, the air cooling type, the water cooling type and the evaporative type. It is known that the heat dissipation efficiency of a water cooling type heat exchanger is slightly better than air cooling type ones, but the heat dissipation efficiency of an evaporative cooling type heat exchanger is much better than a water cooling type ones because that one liter of water absorbs 1 Kcal of heat when raising 1°C, but absorbs 539 Kcal when evaporated.
  • cooling efficiency by directly dissipating heat from coil tubes should be better than by indirectly dissipated from cooling fins which the heat have to be transferred to cooling fins from coil tubes first.
  • a conventional heat exchanger composed of a plurality of cooling fins with high density of 13 pieces per inch up to 17 pieces per inch, there will be easy to deposit dirt and sediment to corrupt the cooling fins, and having no enough spacing for cleaning and inconvenient for maintenance.
  • the present invention have been solved the problem by utilizing streamline cross sectional tube to instead of conventional round tube used for medium coil.
  • FIG. 1A showing a wind flow "w” blows passing through a conventional round tube R having a water film thereon, which the wind "w” divided into two flows around the surface of both side of the round tube respectively to a point F and F'at the rear portion after passed over the diameter DD' thereof, then the wind flows leave the tube surface and going directly to the back side, therefor the wind flow "w” dose not blow over the surface of the arc FF' to produce evaporating effects, it is a great loss of evaporative efficiency therefore, because the surface around the arc FF' is almost larger than 1/3 of the surface of a whole tube, further more there will a turbulence of eddy current "C” and a windless zone "T” be occurred at a rear space behind the tube to effect a poor cooling efficiency of the next row tubes of the coil.
  • FIG. 1B showing a wind flow "w” blows passing through a streamline tube S according to the present invention which a wind flow blows over a streamline tube the wind flow "w” divided into two opposite path around the streamline surface of the tube to a gradually reduced rear portion the wind flow will blows still around the streamline surface after passed over the diameter DD' to an end edge "E", and there will be no eddy current and no windless zone occurred, further more according to the theory of aerodynamics that the wind speed will increases while the wind blows over the rear portion surface of the streamline tube from point D(&D') to the end edge point E and a negative pressure "P" will be provide thereat so as to increase a large amount of evaporative efficiency while a water film is held instantly on the surface of the tubes.
  • a coordinate non-pressure water feeding system is employed to supply evaporative water for providing a water film held on the surface of the tubes for an instance to give enough time for fully evaporated thereon.
  • a major object of that present invention is to provide an evaporative heat exchanger of a condenser of an air conditioning system which the medium coil is composed of a plurality of streamline cross sectional tubes to instead conventional round tubes so as to highly increase the evaporative cooling efficiency therefore.
  • Another major object of the present invention is to provide an evaporative heat exchanger which the numbers of conventional cooling fins can be greatly reduced to a minimum even to avoid the using of cooling fins so as to save a large amount of manufacturing cost.
  • Still another main object is to provide an evaporative heat exchanger with less even without cooling fins which will be easy to clean and convenient for maintenance.
  • the present invention relates to a coil assembly for use in a water evaporative type heat exchanger of a cooling medium condensing apparatus especially relates to a coil assembly which a plurality of streamline cross sectional tubes are used to instead of the conventional round cross sectional tubes for highly improving the evaporating efficiency to maintain a high E.E.R. thereof, in which the number of cooling fins can be greatly reduced to a minimum even be completely omitted to a bare coil for providing the improvement of easy to clean and convenient for maintenance therefore.
  • a heat exchanger 110 is composed of a plurality of streamline cross section tubes 122 paralleled with a tilted slop formed of at least one set of coil 120 therefore, a plurality of wind guiding plate 130 disposed on a supporting frame 140 to guide the wind from a fan system 150 to a direction in parallel with the slop of the streamline tubes to insure that the wind flow will be passing through the surface of the streamline tubes smoothly to provide a maximum evaporative cooling efficiency while a water film is covered thereon.
  • Fig. 3 it shows an embodiment of a complete condenser apparatus 10 according to the present invention, which the numbers of vertical fins 110 has been reduced to provide a wide interval between adjacent fins, the medium coil 120 is composed of a plurality of streamline tubes 122, a plurality of wind guiding plate 130 disposed on a supporting frame 140 at one side (back side as shown), a fan system 150 (not shown, please referring to Fig.
  • a evaporative water recycling feeding system 20 compressing a water distributor 210 of water absorptive foaming material disposed over a top of the cooling fins 110 for seeping non-pressure water drops to distribute water gently and evenly so as to maintain a water film to be held on the surface of tube 122 having enough time to fully evaporated therefrom, a water tank 220 disposed under the cooling fins 110 to supply evaporative water and collecting the residual water from the cooling fins 110 then ready for recycling by a pump 260, a recycling water pre-cooling heat exchanger 230 disposed at a top over the water distributor pad 210 comprising a plurality of vertical cooling fins 232 and a water coil 234 laterally pierced the fins 232 for pre-cooling the recycling water to avoid an over heat due to an accumulating effect of temperature raising in a long time running therefore.
  • FIG. 3A it shows a detailed construction of a recycling water tank 220 having a fresh water supply inlet pipe 221 connected to a water source, a floating valve 224 to control the water keeping in a constant level, an automatic blow down valve 237 disposed on to a blow down pipe 228 under the tank 220 automatically operated periodically once daily or by-daily to change the recycled water into fresh water therefore, an over flow exhaust pipe 229 extended out from a bottom of the tank 220 and connected to the blow down pipe 228 by passed the blow down valve 227, having a horn type opening head inside the tank 220 with a height just flat to the constant water level used to exhaust the over flow water which a great amount of residual water falls down to the tank 220 in an instance while to cut off the apparatus.
  • FIG. 4 shows a water coil 234 of a recycling water pre-cooling heat exchanger 20 having a recycling water inlet 235 connected from the pump 260 (see Fig. 3) and a tail tube 236 to spray water on to the water distributor 210
  • Fig. 4A is a partial sectional view to show the tail tube 236 spraying water onto the water distributor 210 from a plurality of spray holes 238 thereof.
  • Fig 5, 5A and 5B which a plurality of rows of needle set 212 with the needle tips 216 pierced out the bottom of the water distributor 210 at the intervals between adjacent cooling fins 110 to guiding the seeping water falling down to the streamline tubes drop by drop in a non-pressure manner so as to provide a water film held on the surface of the streamline tube for an instance to have enough time for fully evaporated while the wind flow blows therefor.
  • a bare coil of streamline tubes 122 is composed to avoid the using of cooling fins, which has the improvement of easy to clean and convenient for maintenance therefore.
  • a tadpole shaped cross sectional tube has a streamline tube 122 with a tail fin 1221 extended from a tail edge thereof, which is used for a bare coil to increase the cooling area of water evaporating.
  • FIG.8 it is a side view of an embodiment of a bare coil composed of a tadpole shaped streamline tube with a tilt angle thereat.
  • FIG. 9A to 9F please, there are side views of different embodiment of condensers having the medium coil made of streamlining tubes either with a reduced number cooling fins or even without cooling fins according to the present invention.
  • FIG. 9A shows an embodiment of two heat exchangers 10 disposed in parallel with coils 120 of streamline tubes 122, a fan system 150 disposed at a top center to draw the air flow blows over the streamline tubes 122 and exhausted out upwardly therefrom, a water distributor 210 disposed respectively at a top of each heat exchanger 10 for feeding evaporative water to the coil tubes 122 therefrom.
  • Fig. 9B and 9C respectively showing a rectangular and a trapezoid shape heat exchanger 10 having a plurality of vertical streamline tubes 122 of coils 120, a plurality of water spray tubes 250 disposed at a bottom, and a fan system 150 at a top to draw the wind flow upwardly to blow over the streamline tubes 122 therefore.
  • Fig. 9D is one of the most preferable embodiments according to the present invention, which two trapezoid shaped heat exchangers 10 are disposed in opposite side with coils 120 of streamline tubes 122, respectively having a water distributor 210 at a top thereof and two additional water spray tubes 250 disposed to an opposite outside at a bottom respectively to spray water to an under side surface of the streamline tubes therefore to provide an evaporative water film thereon, a fan system 150 disposed at a top to draw the wind upwardly passing over the surface of streamline tubes 122 therefore.
  • Fig. 9E and 9F both consist of two opposite heat exchanger 10 similar to Fig. 9D, which Fig. 9E is composed of a "V" type while Fig. 9F is composed of an "A" type.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP03250233A 2003-01-15 2003-01-15 Echanegeur de chaleur à évaporation avec tubes profilés faiblement ou pas du tout ailettés Withdrawn EP1439361A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03250233A EP1439361A1 (fr) 2003-01-15 2003-01-15 Echanegeur de chaleur à évaporation avec tubes profilés faiblement ou pas du tout ailettés

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03250233A EP1439361A1 (fr) 2003-01-15 2003-01-15 Echanegeur de chaleur à évaporation avec tubes profilés faiblement ou pas du tout ailettés

Publications (1)

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EP1439361A1 true EP1439361A1 (fr) 2004-07-21

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EP03250233A Withdrawn EP1439361A1 (fr) 2003-01-15 2003-01-15 Echanegeur de chaleur à évaporation avec tubes profilés faiblement ou pas du tout ailettés

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116972459A (zh) * 2023-09-25 2023-10-31 杭州医维之星医疗技术有限公司 一种冷凝水潜冷回收装置、系统、制冷设备及控制方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR807796A (fr) * 1936-07-02 1937-01-21 Economiseur Green L Perfectionnements aux faisceaux tubulaires pour échangeurs de chaleur
US3885936A (en) * 1972-03-01 1975-05-27 Lund Basil Gilbert Alfred Heat exchangers
EP0119934A2 (fr) * 1983-03-21 1984-09-26 Bertin & Cie Réfrigérant fermé à ventilation forcée et à circuit étanche
JPS6396490A (ja) * 1986-10-13 1988-04-27 Ishikawajima Harima Heavy Ind Co Ltd 熱交換器
EP0272766A1 (fr) * 1986-12-02 1988-06-29 Evapco International, Inc. Assemblage de serpentins de tubes elliptiques pour échangeur de chaleur à évaporation
US5076347A (en) * 1990-11-19 1991-12-31 Coolex, Inc. Indirect evaporative cooler
JP2000234882A (ja) * 1999-02-10 2000-08-29 Denso Corp 熱交換器

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR807796A (fr) * 1936-07-02 1937-01-21 Economiseur Green L Perfectionnements aux faisceaux tubulaires pour échangeurs de chaleur
US3885936A (en) * 1972-03-01 1975-05-27 Lund Basil Gilbert Alfred Heat exchangers
EP0119934A2 (fr) * 1983-03-21 1984-09-26 Bertin & Cie Réfrigérant fermé à ventilation forcée et à circuit étanche
JPS6396490A (ja) * 1986-10-13 1988-04-27 Ishikawajima Harima Heavy Ind Co Ltd 熱交換器
EP0272766A1 (fr) * 1986-12-02 1988-06-29 Evapco International, Inc. Assemblage de serpentins de tubes elliptiques pour échangeur de chaleur à évaporation
US5076347A (en) * 1990-11-19 1991-12-31 Coolex, Inc. Indirect evaporative cooler
JP2000234882A (ja) * 1999-02-10 2000-08-29 Denso Corp 熱交換器

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 332 (M - 738) 8 September 1988 (1988-09-08) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 11 3 January 2001 (2001-01-03) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116972459A (zh) * 2023-09-25 2023-10-31 杭州医维之星医疗技术有限公司 一种冷凝水潜冷回收装置、系统、制冷设备及控制方法
CN116972459B (zh) * 2023-09-25 2024-01-12 杭州医维之星医疗技术有限公司 一种冷凝水潜冷回收装置、系统、制冷设备及控制方法

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