CN101576356A - Heat exchanger using microporous hydrophobic membrane for strengthening heat exchange - Google Patents
Heat exchanger using microporous hydrophobic membrane for strengthening heat exchange Download PDFInfo
- Publication number
- CN101576356A CN101576356A CNA2008101060112A CN200810106011A CN101576356A CN 101576356 A CN101576356 A CN 101576356A CN A2008101060112 A CNA2008101060112 A CN A2008101060112A CN 200810106011 A CN200810106011 A CN 200810106011A CN 101576356 A CN101576356 A CN 101576356A
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- heat exchanger
- heat
- membrane
- fluid
- vapor pressure
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- 239000012528 membrane Substances 0.000 title claims abstract description 27
- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 19
- 238000005728 strengthening Methods 0.000 title abstract description 7
- 239000012530 fluid Substances 0.000 claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims description 10
- 229920006395 saturated elastomer Polymers 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000012153 distilled water Substances 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims 2
- 239000012982 microporous membrane Substances 0.000 claims 2
- 239000012266 salt solution Substances 0.000 claims 2
- 239000012510 hollow fiber Substances 0.000 claims 1
- 239000000243 solution Substances 0.000 claims 1
- 239000008399 tap water Substances 0.000 claims 1
- 235000020679 tap water Nutrition 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 description 25
- 238000001816 cooling Methods 0.000 description 15
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 10
- 238000004821 distillation Methods 0.000 description 8
- 238000001704 evaporation Methods 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 8
- 239000012071 phase Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 229910052763 palladium Inorganic materials 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000009938 salting Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 229940059936 lithium bromide Drugs 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 241001347978 Major minor Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a heat exchanger using a microporous hydrophobic membrane for strengthening heat exchange. The shell of the heat exchanger is made of metal and fluid in the internal pipeline in the heat exchanger is divided by the microporous hydrophobic membrane into two parts flowing in opposite directions; fluid on a hot side of the heat exchanger contacts a heat exchange surface; the fluid on the hot side is heated by an external heat current, the temperature of the fluid on the hot side rises to generate a vapor pressure difference between two sides of the membrane, a working medium on high vapor pressure side evaporates and penetrates the membrane to flow to a low pressure side to achieve an effect of phase change heat transfer.
Description
Technical field
The present invention relates to a phase-change cooling device based on film distillation principle, relate in particular to a kind of heat exchanger that utilizes microporous hydrophobic membrane for strengthening heat exchange.
Background technology
Because latent heat is more much bigger than sensible heat, so same Working fluid phase changing heat exchange has higher efficient than single-phase heat exchange, for cooling procedure, cooling working medium generating gasification in heat transfer process will help improving total coefficient of heat transfer.Yet the condition of liquid gasification is that its saturated vapour pressure is higher than its dividing potential drop in gas phase, has only usually by rising temperature or reduction pressure and reaches this condition.The most frequently used heat-exchange working medium is a water in the engineering, under normal pressure and the condition a little more than room temperature, generally is to realize transpiration-cooledly, can only adopt single phase flow heat transfer.
Film distillation (Membrane Distillation, MD) be a kind of be the mass transfer separation process of driving force based on microporous hydrophobic membrane, with the steam pressure difference of film two side liquids.The basic principle of film distillation is: because the microporosity and the hydrophobicity of film, under capillary effect, the both sides liquid that can not arrives opposite side by fenestra; The mean molecule free path of steam is much larger than the average pore size of microporous barrier, thereby can see through fenestra; Film both sides liquid is owing to the existence of the temperature difference has different vapour pressure (also can cause steam pressure difference by other factors), and hot side liquid is constantly vaporized at membrane interface, and steam molecule flows to cold side by fenestra under steam pressure difference drives, and finally condenses at cold side.The film still-process is very similar with the evaporation-transmission-condensation process of conventional distillation, and its outstanding advantage is to operate under normal pressure and the temperature a little more than normal temperature.
Film distillation technology starts from the sixties in 20th century, is developed rapidly after the eighties, concentrates in desalinization, material at present, numerous areas such as wastewater treatment, unconventional separation obtain and should have.Film distillation technology has been applied as a kind of separation means since coming out, and the people is not arranged as yet with its means as enhanced heat exchange.Yet, to the Heat and Mass Transfer Characteristics of this process studies show that evaporation and heat-exchange occupies the proportion of can not ignore in heat transfer process, along with the progress of membrane material, the steam flux improves constantly, the ratio escheat of evaporation and heat-exchange will further improve.
The material cooling is a requisite link in the industrial processes such as chemical industry, electric power, heat exchanger area and the circulation pump power quantity that drops into is big very surprising for this reason, therefore, cooling effectiveness just may be saved a considerable number of metal material and electric energy as long as improve little by little.The thermal efficiency that cooling means can significantly improve cooling heat exchanger is strengthened in the film distillation, if applied, will produce great economic benefit and social benefit, has broad application prospects.
Summary of the invention
The object of the present invention is to provide a kind of heat exchanger that utilizes microporous hydrophobic membrane for strengthening heat exchange, to improve the thermal efficiency of cooling heat exchanger.
For achieving the above object, the heat exchanger that utilizes microporous hydrophobic membrane for strengthening heat exchange provided by the invention, heat exchanger shell are metal, with dewatering microporous film the fluid partitioning in the heat exchanger internal pipeline are become two parts, two parts direction of flow is opposite or identical, but being the best on the contrary; And the hot side liquid of heat exchanger contacts with heat-transfer surface; Hot side liquid is heated by external hot-fluid, and temperature raises, and causes the saturated vapor pressure of film two side liquid correspondences difference to occur, the high temperature side fluid has higher saturated vapor pressure, thereby have the working medium evaporation, and see through film inflow low-pressure side, thus play the effect of phase-change heat transfer.
Described heat exchanger, wherein, described dewatering microporous film is flat sheet membrane or hollow-fibre membrane.
Described heat exchanger, wherein, described hot side liquid is a water.
Described heat exchanger, wherein, described water is distilled water or the softening running water of handling.
Described heat exchanger, wherein, described cold-side fluid is water, thin steam, dry air or salting liquid.
Described heat exchanger, wherein, the salting liquid in the described cold-side fluid is the salting liquid (as: lithium-bromide solution) with low saturated vapor pressure.
Described heat exchanger, wherein, described outer cover of heat exchanger is copper, iron, aluminium or stainless steel.
The present invention has following effect:
1) operating temperature is low
Can vaporize to the broad temperature range between the boiling point in normal pressure, room temperature, this is that conventional evaporative cooling is incomparable.
2) thermic load self adaptation
Evaporation capacity increases and increases along with thermic load, and phase transition process helps improving the temperature field uniformity, compares with the single-phase flow cooling to have remarkable advantages.
3) vapour-liquid shunting
Liquid phase and vapour phase have clear and definite interface, realize the vapour-liquid shunting, can effectively avoid common vapour locking phenomenon in the conventional two phase flow cooling, avoid droop loss and heat transfer deterioration.
Description of drawings
Fig. 1 is the heat exchanger structure schematic diagram of the embodiment of the invention 1;
Fig. 2 a is the heat exchanger structure schematic diagram of the embodiment of the invention 2;
Fig. 2 b is along the generalized section of a-a line among Fig. 2 a.
Main mark explanation in the accompanying drawing:
1, microporous hydrophobic membrane
2, metal tube
3, primary flow channel
4, auxilliary flow channel
5, film holder
6, laser instrument palladium bar
A, cold-side fluid
B, hot side liquid
The specific embodiment
See also Fig. 1, the present invention utilizes the heat exchanger of microporous hydrophobic membrane for strengthening heat exchange, and global shape is a pipe shape, and being mainly used in the object that needs cooling is than granule or liquid-state material.The housing of heat exchanger outside (metal tube 2) is a heat-transfer surface, and the material of this metal tube 2 can adopt heat carrier to make, and is such as but not limited to copper, iron, aluminium, stainless steel etc.Inside at this metal tube 2 is separated into primary flow channel 3 (being film exterior annular pipeline) and auxilliary flow channel 4 (being film interior annular pipeline) two parts with dewatering microporous film 1.Microporous hydrophobic membrane of the present invention is the polytetrafluoroethylene (PTFE) film, fenestra average diameter 0.1mm, porosity 70%, thickness 0.2mm.The fluid of primary flow channel 3 and auxilliary flow channel 4 opposite (flow direction can be identical also can be opposite, flow on the contrary better with regard to its effect), that is: the liquid in the primary flow channel 3 flows to the left side of accompanying drawing, and the liquid in the then auxilliary flow channel 4 flows to the right, and vice versa.Hot side liquid can be distilled water or the softening running water of handling, cold-side fluid can be the working medium identical with hot side liquid, also can be the thin steam of nearly vacuum state, it can also be dry air, perhaps certain has the salting liquid of low saturated vapor pressure, belonging to known technology about the salting liquid with low saturated vapor pressure, is to be that example describes with the lithium-bromide solution in the present embodiment.
When carrying out heat exchange, the material that needs cooling contacts with heat-transfer surface through the heat exchanger metal tube, and the hot side liquid A that flows in the major-minor flow channel 3 contacts with heat-transfer surface, and the cold-side fluid B in the auxilliary flow channel 4 does not contact with heat-transfer surface.Hot side liquid A is heated by external hot-fluid (promptly needing to cool off the heat of material), temperature raises, form steam pressure difference in the microporous hydrophobic membrane both sides, form high-vapor-pressure in the primary flow channel 3, the working medium evaporation is arranged, thereby form low-pressure side in auxilliary flow channel 4, the working medium of evaporation sees through the microporous hydrophobic membrane film and flows in the auxilliary flow channel 4, thereby plays the effect of phase-change heat transfer.
Be cooled to example with high power laser palladium bar again and describe, heat exchanger global shape of the present invention is a rectangle, its structure as shown in Figure 2, the housing 2 of heat exchanger is made for brass.Heat exchanger is inner to be separated into primary flow channel 3 (being the lower side conduit among Fig. 2) and auxilliary flow channel 4 (being the upside pipeline among Fig. 2) two parts with dewatering microporous film 1, the wall thickness 1mm of the housing 2 of heat exchanger, the height of primary flow channel and auxilliary flow channel is respectively 2.5mm, long and width and laser instrument palladium bar 6 measure-alike.Microporous hydrophobic membrane is the PTFE film, fenestra average diameter 0.1mm, porosity 70%, thickness 0.2mm.The primary flow channel 3 of heat exchanger contacts with laser instrument palladium bar 6, and hot side liquid is a distilled water, and cold-side fluid is a 50%LiBr solution, and the two flow direction is opposite, and flow velocity is roughly the same.
Hot side liquid A is heated by external hot-fluid (being the heat of laser instrument palladium bar), temperature raises, form steam pressure difference in the microporous hydrophobic membrane both sides, form high-vapor-pressure in the primary flow channel 3, the working medium evaporation is arranged, thereby form low-pressure side in auxilliary flow channel 4, the working medium of evaporation sees through the microporous hydrophobic membrane film and flows in the auxilliary flow channel 4, thereby plays the effect of phase-change heat transfer.
15 ℃ of distilled water inlet temperatures, under the situation that LiBr solution inlet temperature is 25 ℃, the exchanger heat current density can reach 80W/cm
2, under the same operating mode, cooling effectiveness at present the most practical comparable single-phase flow cooling heat exchanger is high more than 60%.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101060112A CN101576356A (en) | 2008-05-07 | 2008-05-07 | Heat exchanger using microporous hydrophobic membrane for strengthening heat exchange |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101060112A CN101576356A (en) | 2008-05-07 | 2008-05-07 | Heat exchanger using microporous hydrophobic membrane for strengthening heat exchange |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101576356A true CN101576356A (en) | 2009-11-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101060112A Pending CN101576356A (en) | 2008-05-07 | 2008-05-07 | Heat exchanger using microporous hydrophobic membrane for strengthening heat exchange |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101576356A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017585A (en) * | 2011-09-23 | 2013-04-03 | 北京兆阳能源技术有限公司 | Phase change heat exchange device |
| CN105466241A (en) * | 2015-11-13 | 2016-04-06 | 太仓圣广仁自动化设备有限公司 | Porous plate for steam heating |
| CN106365228A (en) * | 2015-07-24 | 2017-02-01 | 北京中环膜材料科技有限公司 | Double-latent membrane distillation assembly |
| CN109764736A (en) * | 2018-12-21 | 2019-05-17 | 北京空间飞行器总体设计部 | A high-efficiency heat dissipation device for space microporous film evaporation |
| CN111615290A (en) * | 2019-02-25 | 2020-09-01 | 龙大昌精密工业有限公司 | The cooling structure of the condenser |
| CN114754616A (en) * | 2022-03-15 | 2022-07-15 | 重庆大学 | Drainage membrane liquid pumping energy storage system |
| CN115259287A (en) * | 2022-09-03 | 2022-11-01 | 南华大学 | High-yield tubular membrane distillation membrane device and wastewater concentration method |
-
2008
- 2008-05-07 CN CNA2008101060112A patent/CN101576356A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017585A (en) * | 2011-09-23 | 2013-04-03 | 北京兆阳能源技术有限公司 | Phase change heat exchange device |
| CN103017585B (en) * | 2011-09-23 | 2015-01-28 | 北京兆阳光热技术有限公司 | Phase change heat exchange device |
| US9897391B2 (en) | 2011-09-23 | 2018-02-20 | Beijing Terasolar Energy Technologies Co., Ltd. | Phase transformation heat exchange device |
| CN106365228A (en) * | 2015-07-24 | 2017-02-01 | 北京中环膜材料科技有限公司 | Double-latent membrane distillation assembly |
| CN105466241A (en) * | 2015-11-13 | 2016-04-06 | 太仓圣广仁自动化设备有限公司 | Porous plate for steam heating |
| CN109764736A (en) * | 2018-12-21 | 2019-05-17 | 北京空间飞行器总体设计部 | A high-efficiency heat dissipation device for space microporous film evaporation |
| CN111615290A (en) * | 2019-02-25 | 2020-09-01 | 龙大昌精密工业有限公司 | The cooling structure of the condenser |
| CN111615290B (en) * | 2019-02-25 | 2022-07-26 | 龙大昌精密工业有限公司 | Cooling structure of condenser |
| CN114754616A (en) * | 2022-03-15 | 2022-07-15 | 重庆大学 | Drainage membrane liquid pumping energy storage system |
| CN115259287A (en) * | 2022-09-03 | 2022-11-01 | 南华大学 | High-yield tubular membrane distillation membrane device and wastewater concentration method |
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Open date: 20091111 |