CN101922811A - Cylindrical array volume heat exchanger - Google Patents
Cylindrical array volume heat exchanger Download PDFInfo
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- CN101922811A CN101922811A CN 201010237888 CN201010237888A CN101922811A CN 101922811 A CN101922811 A CN 101922811A CN 201010237888 CN201010237888 CN 201010237888 CN 201010237888 A CN201010237888 A CN 201010237888A CN 101922811 A CN101922811 A CN 101922811A
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- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 4
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000010457 zeolite Substances 0.000 claims abstract description 4
- 238000005516 engineering process Methods 0.000 claims description 5
- 229920000742 Cotton Polymers 0.000 claims description 4
- 230000005855 radiation Effects 0.000 abstract description 24
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 7
- 238000004049 embossing Methods 0.000 abstract 1
- 238000012546 transfer Methods 0.000 description 25
- 238000011160 research Methods 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 5
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- 238000010168 coupling process Methods 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
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- 238000004088 simulation Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000000342 Monte Carlo simulation Methods 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N argon Substances [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
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- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
A cylindrical array volumetric heat exchanger that improves radiation characteristics and internal flow processes, thereby increasing the overall efficiency of the system. The technical scheme is as follows: the device comprises a cavity and is characterized in that a cylinder array consisting of a plurality of cylinders is arranged on the inner side wall of the cavity. The cavity is in a regular hexagon shape. The cylindrical surface is a rough surface and voids treated with napping, embossing, cutting and zeolite techniques.
Description
Technical field
The invention belongs to volume heat exchanger device field, solar heat power station, especially a kind of radiation characteristic and internal flow process improved, thereby the cylindrical-array volume heat exchanger of raising system synthesis efficient.
Background technology
Solar heat power station combined power plants generally are made up of reflector, focus set, heat exchanger and turbine power generation unit and tracking control system etc., and its gross efficiency depends primarily on too can collector efficiency and generating efficiency.The solar heat exchanger of studying and design corresponding HTHP high power capacity has become the important subject of present field of solar energy.
At present the volume heat exchanger problem that exists in solar heat power station is: radiation characteristic and internal flow process influence the overall efficiency of system.
China built up at the Nanjing Jiangning District in 2005 in first solar energy thermal-power-generating demonstration power station, what adopt is tower system, it utilizes numerous heliostats, the solar heat radiation is reflexed to the receiver of high top of tower, the heating work medium produces superheated steam or HTHP air driven steam turbine or Gas Turbine Generating Units, and change solar energy is electric energy.Wherein, the solar energy volume heat exchanger receives solar radiation and heating work medium.At present, honeycomb and grid heat exchanger efficiency and reliability aspect existing problems, research to the solar energy volume heat exchanger is scarcely out of swaddling-clothes, lack a large amount of utility datas, but to the similar turbulence columns row's of heat exchanger internal structure mobile and heat exchange therewith, scientists has been carried out big quantity research, and these researchs can be used as Technical Reference of the present invention.
NASA-Lewis (VanFossen et al.) and Arizona State University people such as (Metzger et al.) have studied the coefficient of heat transfer of in rectangular channel H/D=0.5 and 2.0 4 row's fork row type turbulence columns by experiment, result of study shows that total coefficient of heat transfer of short turbulence columns is lower than long turbulence columns (l/d=8).The cylinder coefficient of heat transfer is higher by 35% than end wall.Row's number is increased to 8 rows from 4 rows, and average heat transfer coefficient has increase slightly.Change 2/3 o'clock coefficient of heat transfer from fork row direction to the in-line arrangement direction and increase by 9%, drag losses descends 18%.When the high l/d of post＜2, average heat transfer coefficient is not subjected to the high influence of turbulence columns, Nu=f (Re); And when l/d＞2, the coefficient of heat transfer increases along with the increase of l/d, at this moment, Nu=f (Re, l/d).
People such as Metzger have measured the fork short turbulence columns row's of row (H/D=2.5 and H/D=1.5) the local coefficient of heat transfer in the rectangular channel by experiment, the result shows, row's average heat transfer coefficient of streamwise increases earlier, reaches maximum 3-5 row, and gradual slow descends then; Find that also longshore current peak value when spacing is big occurs to such an extent that early (during H/D=2.5, appear at the 3rd row; During H/D=1.5, appear at the 5th row).They studies show that, heat exchange arranges in the passage that not as heat exchange in the long tube row turbulence columns has also strengthened the pressure loss when strengthening heat exchange in the short turbulence columns row.
How the Chyu employing distils and the method for heat and mass analogy has been measured the influence of turbulence columns spread pattern to the exchange of end wall caloic.L/d=1, s/d=2.4, x/d=2.08, in-line arrangement and fork come preceding two row's mass tranfer coefficient height, and the 3rd row begins cyclically-varying later.All higher at regional mass tranfer coefficient near post, little along fork row difference, but in the zone away from post, very big along fork row difference.When arranging along fork, average mass tranfer coefficient increases by 46% and 53% than the smooth passage respectively.
Chyu draws during heat exchange in nineteen ninety research has the short turbulence columns row of the curving of castings: with the increase that flows to the turbulence columns spacing, preceding two arrange average heat transfer coefficients increase faster of turbulence columns; The turbulence columns spacing reduces, and each arranges average heat transfer coefficient all increases, and flowing pressure loss also increases simultaneously, still has this rule when there is the curving of castings in turbulence columns.Have the turbulence columns of the curving of castings to compare with no fillet, the coefficient of heat transfer is little and the pressure loss is big.The cylinder and the end face coefficient of heat transfer are almost equal.
Summary of the invention
The purpose of this invention is to provide a kind of radiation characteristic and internal flow process improved, thereby improve the cylindrical-array volume heat exchanger of system synthesis efficient.
Technical scheme of the present invention is: cylindrical-array volume heat exchanger, comprise cavity, and it is characterized in that described cavity madial wall is provided with the cylindrical-array of being made up of several cylinders.
Described cavity is a regular hexagon.
Described periphery is the rough surface and the space of handling with plucking, cotton ginning, cutting and zeolite technology.
Effect of the present invention is: solar heat power station cylindrical-array volume heat exchanger, the cavity madial wall is provided with cylindrical-array.The heat exchange property that this heat exchanger is good can be summed up as 2 points, the radiation characteristic of first excellence, and it two is improvement of internal flow process.Cylinder in the flow field has the function of turbulent flow generator, and the suitable layout of cylindrical-array can reach and makes the more effect of tending to become strong of turbulent flow.Sunshine after the focusing enters heat exchanger through window, and forms Energy distribution comparatively uniformly by the reflex of cylindrical-array.Primary Study shows, can reach 21% with cylindrical-array as its system synthesis efficient of solar heat power station of heat exchanger under the prior art level.
Studies show that along with the increase of Reynolds number, the mean temperature of heat exchanger exit is successively decreased, and enter the mouth, the local coefficient of heat transfer of outlet and cylinder obviously increases, the overall average coefficient of heat transfer of heat exchanger shows tangible increase trend along with the increase of Reynolds number; Re=10
4The time, along with the increase that flows to spacing, the mean flow rate of flow field outlet increases to some extent, and during Sx/D=3.0, flow field drag losses minimum is when maximum appears at Sx/D=1.5; The overall average coefficient of heat transfer of heat exchanger reduces along with the increase that flows to spacing.Re=10
4Under the condition, along with the increase of cylinder height, the mean flow rate of flow field outlet reduces to some extent; Resistance coefficient f is respectively: 4.54,6.823,8.45, and then the loss of total pressure of whole passage also increases gradually; Total heat exchange amount of heat exchanger has tangible increase, and its overall average coefficient of heat transfer also increases greatly along with the increase of cylinder height.Be respectively 10 at Reynolds number
3, 10
4, 10
5The time, studied the influence of the existence of radiation to each field distribution of fork row cylindrical-array volume heat exchanger.The existence of radiation is very little to the influence of velocity field; Under the identical Reynolds number condition, all when radiation was arranged, promptly the existence of radiation reduced the drag losses in flow field to the average resistance coefficient when not having radiation to exist under the same terms; Under the identical Reynolds number condition, than radiationless existence, it is big that the local coefficient of heat transfer when having radiation to exist is wanted, and reduce along with the increase of Reynolds number, and the share that the radiation heat transfer amount accounts for total heat exchange amount also reduces along with the increase of Reynolds number, at Re=10
3The time, the radiation heat transfer amount accounts for 44.71%, Re=104:28.78%, and Re=105:8.45% illustrates that at Reynolds number hour the participation of radiation heat transfer is played very big effect to the heat exchange of whole heat exchanger.
The present invention is described further below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the horizontal sectional drawing of Fig. 1;
Fig. 3 is the coarse processing schematic diagram of flow-disturbing periphery among Fig. 1;
Fig. 4 is that schematic diagram is divided in the zone of the inner flow-passing surface of heat exchanger.
The specific embodiment
Among Fig. 1, Fig. 2, cylindrical-array volume heat exchanger, comprise cavity 1, cavity 1 madial wall is provided with the cylindrical-array of being made up of several cylinders 2, cavity 1 is a regular hexagon, longitudinal pitch between each cylinder 2 of cylindrical-array,, horizontal spacing and cylinder height be respectively: longitudinal pitch Dx, horizontal spacing Sy and cylinder height H.
Among Fig. 3, the surface of cylinder 2 is the rough surface and the spaces of handling with plucking, cotton ginning, cutting and zeolite technology, and wherein, figure (a) is a spiral lamination, and figure (b) is the small scale slit, and figure (c) is cotton ginning.
Among Fig. 4, the zone of the inner flow-passing surface of heat exchanger is divided, and the 41st, adiabatic cover plate, the 42nd, free end, the 43rd, the top, the 44th, the wall zone of influence, the 45th, bottom wall, Tb is the cylindrical wall surface temperature, h is the distance of top apart from adiabatic cover plate.
Sunshine after the line focus enters heat exchanger through window, and by the reflex of cylindrical-array Energy distribution is tending towards evenly, and working medium is carried away energy by heat convection from the inlet heat exchanger inside of flowing through.In this process, all wetted surfaces comprise that the heat exchanger internal side wall all participates in complicated heat transfer process, and each surface absorbs solar radiation energy causes temperature to raise, and energy is passed to the working medium that flows through.
In the practical application, should be noted that the problem of the following aspects:
1, utilize laser beam simulated solar phototesting to determine cylinder columns and row's number of best radiation heat transfer.
Utilize argon ion and krypton ion laser simulated solar irradiation, measure under the various geometric situation attenuation rate, transmissivity and the corresponding spectral property of light in the heat exchanger, and utilize monte carlo method that radiation heat transfer is carried out analog computation, and the radiation model is carried out necessary correction with reference to the otherness of spectral coverage, thereby reflect the volume heat exchanger radiation characteristic more realistically, and determine cylinder columns and row's number of best radiation heat transfer in view of the above.
2, utilize the orthogonal experiment of heat exchanger internal temperature field and velocity field, determine the longitudinal pitch Dx between the cylindrical-array cylinder, horizontal spacing Sy and cylinder height H.
Utilize contact means and dyeing such as thermal infrared imager, technology such as hydrogen bubble method and the LIF interior flow field velocity of determination experiment model respectively distributes and Temperature Distribution, adopt orthogonal experimental method, begin progressively to little spacing rough surface and spiral cylinder transition from the comparatively simple big smooth cylindrical-array of spacing, so that the yardstick of research coherent structure, the influence factor of intensity and frequency, probe into the theoretical adaptive structure of peripheral flow theory and porous media, yardstick and velocity conditions, to determine the correlated characteristic yardstick of cylindrical-array: longitudinal pitch Dx, horizontal spacing Sy and cylinder height H.
3, based on the numerical simulation of multizone continuous model, optimize the volume heat exchanger model.
Utilize the existing commercial software for calculation STAR-CD in laboratory to carry out the heat exchanger analog computation of different structure yardstick, embed multizone volume heat exchange continuous model, porous media in the research heat exchanger-pure fluid coupling flox condition, comprise the numerical simulation that macroscopic view flows and microcosmic flows, radiation in the research model, the coupling mechanism of heat convection characteristic and radiation and convection, the high efficient heat exchanging mechanism of discussion heat exchanger; By the comparison of dimensionless group, determine the optimum structure feature of heat exchanger, and optimize the volume heat exchanger model in view of the above.
Claims (3)
1. cylindrical-array volume heat exchanger comprises cavity, it is characterized in that described cavity madial wall is provided with the cylindrical-array of being made up of several cylinders.
2. cylindrical-array volume heat exchanger according to claim 1 is characterized in that described cavity is a regular hexagon.
3. cylindrical-array volume heat exchanger according to claim 1 is characterized in that described periphery is the rough surface and the space of handling with plucking, cotton ginning, cutting and zeolite technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010237888 CN101922811A (en) | 2010-07-28 | 2010-07-28 | Cylindrical array volume heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010237888 CN101922811A (en) | 2010-07-28 | 2010-07-28 | Cylindrical array volume heat exchanger |
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| Publication Number | Publication Date |
|---|---|
| CN101922811A true CN101922811A (en) | 2010-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010237888 Pending CN101922811A (en) | 2010-07-28 | 2010-07-28 | Cylindrical array volume heat exchanger |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467660A (en) * | 2014-12-10 | 2015-03-25 | 辽宁远东换热设备制造有限公司 | Special heat exchanger for solar cell panel |
| CN108871731A (en) * | 2017-05-11 | 2018-11-23 | 天津滨海光热跟踪技术有限公司 | Heat collector light leakage light captures measurement method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2722048A (en) * | 1950-04-08 | 1955-11-01 | Jr John R Gier | Method of making heat exchangers |
| EP0889292A1 (en) * | 1997-07-02 | 1999-01-07 | Remeha Fabrieken B.V. | Heat exchanger and central heating boiler comprising such heat exchanger |
| CN1841000A (en) * | 2005-03-31 | 2006-10-04 | 董珍时 | Heat exchanger adapted to mechanical machining |
| US20080110416A1 (en) * | 2006-11-09 | 2008-05-15 | Remeha B.V. | Heat exchange element and heating system provided with such heat exchange element |
-
2010
- 2010-07-28 CN CN 201010237888 patent/CN101922811A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2722048A (en) * | 1950-04-08 | 1955-11-01 | Jr John R Gier | Method of making heat exchangers |
| EP0889292A1 (en) * | 1997-07-02 | 1999-01-07 | Remeha Fabrieken B.V. | Heat exchanger and central heating boiler comprising such heat exchanger |
| CN1841000A (en) * | 2005-03-31 | 2006-10-04 | 董珍时 | Heat exchanger adapted to mechanical machining |
| US20080110416A1 (en) * | 2006-11-09 | 2008-05-15 | Remeha B.V. | Heat exchange element and heating system provided with such heat exchange element |
Non-Patent Citations (1)
| Title |
|---|
| 《航空动力学报》 20020430 朱惠人等 不同直径及形状的短扰流柱群的流阻及换热 246-249 1-3 第17卷, 第2期 2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467660A (en) * | 2014-12-10 | 2015-03-25 | 辽宁远东换热设备制造有限公司 | Special heat exchanger for solar cell panel |
| CN108871731A (en) * | 2017-05-11 | 2018-11-23 | 天津滨海光热跟踪技术有限公司 | Heat collector light leakage light captures measurement method |
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Open date: 20101222 |