CN101320399A - Radiation effect computing method of radiator - Google Patents
Radiation effect computing method of radiator Download PDFInfo
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- CN101320399A CN101320399A CNA2008100434429A CN200810043442A CN101320399A CN 101320399 A CN101320399 A CN 101320399A CN A2008100434429 A CNA2008100434429 A CN A2008100434429A CN 200810043442 A CN200810043442 A CN 200810043442A CN 101320399 A CN101320399 A CN 101320399A
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Abstract
The present invention relates to a calculating method of the cooling effect of radiator. In the method, the wind speed is determined; the heat flow, the wind speed, and the temperature, pressure and pressure difference of the cooling belt perform as the boundary condition; a CFD simulation software is used for calculating the temperature of the outlet; the way of recursive induction is adopted to acquire the relation f (L) between the length of the cooling belt and the cooling effect, and the relation f (N) between the number of the cooling belts and the cooling effect. The calculating method solves the problem of inaccurate results in the prior art which adopts a simplified cooling belt model without a cooling sheet to estimate the cooling effects according to the results of calculation and the total superficial area of the cooling sheet.
Description
Technical field
The present invention relates to the radiation effect computing method of heating radiator.
Background technology
In the Automobile Design stage, when determining the radiator heat-dissipation performance, require to calculate heat dissipation capacity at present, normally used method has following two kinds:
1, the formula based on summary of experience calculates.Relate to the selection of coefficient of heat transfer in the computation process.Because range of choice that coefficient of heat transfer is only given does not have accurate choice criteria, and this coefficient is pilot process data, so select different coefficient of heat transfers to cause directly that the result's is widely different;
2, the CFD simulation analysis of design phase.Because radiator fin model more complicated, be unfavorable for dividing grid, calculate extremely loaded down with trivial details, in order to simplify calculated amount, what adopt usually is the heat-radiation belt simplified model that does not have heat radiator, according to the total surface area of result of calculation and heat radiator, estimates radiating effect again, but because the heat radiator total area that really works can not well estimate, so out of true as a result.
Summary of the invention
Technical matters to be solved by this invention is: in order to overcome the inexactness of above two kinds of methods, provide a kind of method that adopts segmentation to calculate, conclude the radiator heat-dissipation effect of recursion.
The present invention is achieved in that
The radiation effect computing method of heating radiator may further comprise the steps:
1) determines wind speed, extracting a bit of as analytic target of radiator heat-dissipation band, calculate with the CFD simulation software, is boundary condition with temperature, pressure, the pressure reduction of hot gas flow, wind speed, heat-radiation belt, draw the temperature in exit, the record heat-radiation belt is imported and exported the temperature difference;
2) extract the one section heat-radiation belt model longer than previous step, calculate with the CFD simulation software, draw the temperature in exit, the record heat-radiation belt is imported and exported the temperature difference;
3) repeated for second step, note multi-group data, what statistics, recursion were summarized heat-radiation belt length and radiating effect concerns f (L);
4) by calculating the radiating effect of many heat-radiation belts, recursion is summarized and is concerned f (N) between heat-radiation belt radical and radiating effect;
5) the segment heat-radiation belt is accurately divided grid, calculate, that utilizes that recursion comes out concerns f (L) and f (N), calculates the radiating effect of this heating radiator.
Recursion is concluded and is adopted least square method or differential technique in described step (3).
Beneficial effect of the present invention:
Owing to will calculate the radiating effect of heating radiator more accurately, need to adopt the means of simulation analysis, and use more complete model meshes to calculate, just can obtain the true effect of heating radiator.In view of complete heating radiator model data huge, computing machine can't bear calculated amount, grid does not allow to divide thick again, therefore the present invention's employing is a benchmark with the test figure of heating radiator earlier, the consistance of checking result of calculation and final test findings, determine the form that influences relational expression of length and radical, the heating radiator at the needs design comes the emulation recursion to calculate again.Therefore do not need selected calculating parameter, do not have the parameter of fluctuation, the result is clear and definite.And this method is not rule of thumb simply to infer, so, CFD simulation calculation commonly used relatively is accurate many.
Description of drawings
Fig. 1 is the graph of a relation between the length of the heat-radiation belt import and export temperature difference and heat-radiation belt.
Fig. 2 is the graph of a relation between the radical of the heat-radiation belt import and export temperature difference and heat-radiation belt.
Embodiment
According to technical scheme of the present invention, under the situation of 2m/s wind speed, recording the hot gas flow is 499Kg/h, the intake air temperature of heat-radiation belt is 130.02 ℃, cold to advance temperature be 34.63 ℃, and hot admission pressure is 126.15Kpa, and hot side pressure difference is 12.21Kpa, cold side pressure reduction is 70.63pa, adopts following method to calculate the radiating effect of this heating radiator:
1) extract a bit of of heating radiator import corner as analytic target, according to the above-mentioned data that record as boundary condition, initialization CFD software, simulation calculation draws the hot junction outlet temperature;
2) extract than the longer one section heat-radiation belt of object that previous step is got, repeat to finish simulation calculation, the record result;
3) repeat the second step several times, statistical computation result.According to analysis, the length of the heat-radiation belt import and export temperature difference and heat-radiation belt is obviously linear, as shown in Figure 1, result of calculation under the 2m/s wind speed, horizontal ordinate is a heat-radiation belt length, ordinate is that heat-radiation belt is imported and exported the temperature difference, utilizes least square method, draws f (the L)=0.075L+4.79 under this wind speed;
4) in like manner, calculate the radiating effect of many heat-radiation belts, and statistics.According to analysis, only under low wind speed, just can have a significant effect, under big wind speed, because the heat radiator heat radiation is very fast, two interlayers can not interact up and down, so the basically identical as a result of result of calculation when higher wind and individual layer heat-radiation belt, as shown in Figure 2, horizontal ordinate is the heat-radiation belt radical, and ordinate is that the heat-radiation belt out temperature is poor, draw f (N)=-0.376N+6.193:
5) the segment heat-radiation belt is accurately divided grid, calculate, that utilizes that recursion comes out concerns f (L) and f (N), calculates the radiating effect of this heating radiator, the substitution data:
1 layer of total length: f (L)=0.075L+4.79=0.075*610+4.79=50.54 ℃,
1 layer: f (N)=-0.376N+6.193=-0.376*1+6.193=5.82 ℃
9 layers: f (N)=-0.376N+6.193=-0.376*9+6.193=2.81 ℃
8 layers of heat-radiation belt are compared than individual layer heat-radiation belt radiating effect, differ 3.01 ℃, and promptly Δ f (N)=-3.01 ℃,
Wherein: the import and export temperature difference of the single heat-radiation belt of f (L) expression, many heat-radiation belts of Δ f (N) expression are imported and exported temperature approach and are imported and exported the poor of temperature approach with the individual layer heat-radiation belt, just multilayer than individual layer good heat dissipation effect what, or difference is how much.On the basis of calculating single heat-radiation belt effect, consider the effect of multilayer, only need add Δ f (N).
Therefore, comprehensive f (L)+Δ f (N)=50.54-3.01=47.53, it is 49 ℃ that this wind speed is imported and exported temperature difference experimental record value down, and both differ 1.47 ℃, and error satisfies accuracy requirement in 5%.
Claims (2)
1, the radiation effect computing method of heating radiator may further comprise the steps:
1) determines wind speed, extracting a bit of as analytic target of radiator heat-dissipation band, calculate with the CFD simulation software, is boundary condition with temperature, pressure, the pressure reduction of hot gas flow, wind speed, heat-radiation belt, draw the temperature in exit, the record heat-radiation belt is imported and exported the temperature difference;
2) extract the one section heat-radiation belt model longer than previous step, calculate with the CFD simulation software, draw the temperature in exit, the record heat-radiation belt is imported and exported the temperature difference;
3) repeated for second step, note multi-group data, what statistics, recursion were summarized heat-radiation belt length and radiating effect concerns f (L);
4) by calculating the radiating effect of many heat-radiation belts, recursion is summarized and is concerned f (N) between heat-radiation belt radical and radiating effect;
5) the segment heat-radiation belt is accurately divided grid, calculate, that utilizes that recursion comes out concerns f (L) and f (N), calculates the radiating effect of this heating radiator.
2, the radiation effect computing method of heating radiator according to claim 1 is characterized in that: recursion is concluded and is adopted least square method or differential technique in described step (3).
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872380A (en) * | 2010-07-09 | 2010-10-27 | 上海理工大学 | Method for reducing energy consumption loss of area architecture |
| CN102288379A (en) * | 2011-05-26 | 2011-12-21 | 济南大学 | Heat radiator structure for vehicle and heat radiation performance analysis system and method |
| CN106783050A (en) * | 2016-12-27 | 2017-05-31 | 全球能源互联网研究院 | A kind of fin and its method for designing and device and transformer |
| CN109063402A (en) * | 2018-10-18 | 2018-12-21 | 中国北方车辆研究所 | Cooling system wind side emulation mode under a kind of complex flowfield |
| CN109299576A (en) * | 2018-11-12 | 2019-02-01 | 郑州云海信息技术有限公司 | One kind being applied to component heat dissipation Simulation Evaluation method and its test device |
| CN110285993A (en) * | 2019-07-15 | 2019-09-27 | 国网湖南省电力有限公司 | A kind of large power heat pipe radiator heat dissipation bottleneck measuring method |
-
2008
- 2008-06-04 CN CNA2008100434429A patent/CN101320399A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872380A (en) * | 2010-07-09 | 2010-10-27 | 上海理工大学 | Method for reducing energy consumption loss of area architecture |
| CN101872380B (en) * | 2010-07-09 | 2011-12-21 | 上海理工大学 | Method for reducing energy consumption loss of area architecture |
| CN102288379A (en) * | 2011-05-26 | 2011-12-21 | 济南大学 | Heat radiator structure for vehicle and heat radiation performance analysis system and method |
| CN102288379B (en) * | 2011-05-26 | 2015-12-16 | 济南大学 | The system and method that a kind of radiator structure for vehicle and heat dispersion are analyzed |
| CN106783050A (en) * | 2016-12-27 | 2017-05-31 | 全球能源互联网研究院 | A kind of fin and its method for designing and device and transformer |
| CN109063402A (en) * | 2018-10-18 | 2018-12-21 | 中国北方车辆研究所 | Cooling system wind side emulation mode under a kind of complex flowfield |
| CN109063402B (en) * | 2018-10-18 | 2023-01-10 | 中国北方车辆研究所 | Method for simulating wind side of heat dissipation system in complex flow field |
| CN109299576A (en) * | 2018-11-12 | 2019-02-01 | 郑州云海信息技术有限公司 | One kind being applied to component heat dissipation Simulation Evaluation method and its test device |
| CN109299576B (en) * | 2018-11-12 | 2022-02-18 | 郑州云海信息技术有限公司 | Simulation evaluation method applied to component heat dissipation and testing device thereof |
| CN110285993A (en) * | 2019-07-15 | 2019-09-27 | 国网湖南省电力有限公司 | A kind of large power heat pipe radiator heat dissipation bottleneck measuring method |
| CN110285993B (en) * | 2019-07-15 | 2021-06-01 | 国网湖南省电力有限公司 | Method for measuring heat dissipation bottleneck of high-power heat pipe radiator |
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