CN112329361A - Method for analyzing influence of air filter screen on system heat dissipation function based on thermal simulation - Google Patents

Method for analyzing influence of air filter screen on system heat dissipation function based on thermal simulation Download PDF

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CN112329361A
CN112329361A CN202011291773.1A CN202011291773A CN112329361A CN 112329361 A CN112329361 A CN 112329361A CN 202011291773 A CN202011291773 A CN 202011291773A CN 112329361 A CN112329361 A CN 112329361A
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filter screen
air
air filter
arr
heat dissipation
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马杰
孙静
林鹏
杨纯璞
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Tianjin Optical Electrical Communication Technology Co Ltd
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Tianjin Optical Electrical Communication Technology Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2111/00—Details relating to CAD techniques
    • G06F2111/10—Numerical modelling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/08—Fluids
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/08—Thermal analysis or thermal optimisation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces

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  • Physics & Mathematics (AREA)
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  • Pure & Applied Mathematics (AREA)
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Abstract

The invention discloses a method for analyzing influence of an air filter screen on a system heat dissipation function based on thermal simulation. And (3) an analysis step: analyzing influence of the case without a filter screen; setting a filter screen parameter of 0.25in Uni-foam 10PPI 38% Arr for analyzing influence by the case; changing the filter screen parameter to 0.25in Uni-foam 60PPI 82% Arr for analyzing influence; continuously changing the filter screen parameter to 0.50in Uni-foam 10PPI 63% Arr for analyzing the influence; the effect of the analysis was carried out by continuing to change the filter screen parameters to 0.50in Uni-foam 60PPI 91% Arr. When the PPI is smaller, the thickness of the filter screen is increased to improve the filtering capacity, and the heat dissipation temperature of the system is accelerated more slowly. The method analyzes the influence of different filter screen parameters on the system heat dissipation, and the simulation analysis result is obvious.

Description

Method for analyzing influence of air filter screen on system heat dissipation function based on thermal simulation
Technical Field
The invention relates to the technical field of communication equipment heat dissipation simulation, in particular to a method for analyzing influence of an air filter screen on a system heat dissipation function based on thermal simulation.
Background
At present, for a general communication chassis, especially for a case that the inside of the chassis includes a module with relatively high heat and the environmental conditions of the equipment use are relatively severe, the heat dissipation of the system and the reliability of the internal components become important issues, because under the relatively severe environmental conditions, if the air inlet of the system equipment is not provided with an air filter screen, the dust in the system is increased, thereby affecting the reliability of the system; if the air filter screen arranged on the air inlet hole of the system equipment is not suitable, the heat dissipation of the system is influenced, and therefore how to reasonably balance the heat dissipation of the system becomes a problem to be solved in the field of heat dissipation.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a method for analyzing the influence of an air filter screen on the heat dissipation function of a system based on thermal simulation. The invention analyzes the influence of the air filter screens with different parameters on the system heat dissipation by using a thermal simulation method, thereby providing better support on selecting the air filter screens.
The technical scheme adopted by the invention is as follows: a method for analyzing influence of an air filter screen on a system heat dissipation function based on thermal simulation is disclosed, wherein the system comprises an air inlet hole arranged on a case; the method is characterized by comprising the following analysis steps:
(1) when the air inlet of the case is not provided with the air filter screen, the maximum temperature of the system is 77.8 ℃ and the maximum flow rate of air is 9.61m/s through thermal simulation analysis.
(2) When an air filter screen is arranged at an air inlet of the case, the air filter screen parameter is set to be 0.25in Uni-foam 10PPI 38% Arr, wherein in represents the thickness of the air filter screen, PPI represents the average hole number in unit inch of length, the more holes represent the smaller holes, Arr represents the dust blocking capacity of the air filter screen, Uni-foam represents a single air filter screen, and when the thickness of the air filter screen is set to be 0.25in, the PPI value is 10, and the Arr capacity is 38%; the maximum temperature of the system is 81.6 ℃ and the maximum flow velocity of air is 11.1m/s through thermal simulation analysis.
(3) Changing the parameters of the air filter screen of the air inlet hole, setting the parameters to be 0.25in Uni-foam 60PPI 82% Arr, and analyzing by the comparison step (2): namely, when the thickness of the air filter screen is set to be 0.25in, the PPI value is increased to 60, the Arr capacity is increased to 82%, the maximum temperature of the system is 91.3 ℃ through thermal simulation analysis, and the maximum flow velocity of air is 17.4 m/s.
(4) And continuously changing the parameters of the air filter screen of the air inlet hole, setting the parameters to be 0.50in Uni-foam 10PPI 63% Arr, and analyzing by the comparison step (2): the thickness of the air filter screen is changed to 0.50in, which is twice that of the step (2), the Arr capacity is improved to 63%, the maximum temperature of the system is 84 ℃ and the maximum air speed is 13.2m/s through thermal simulation analysis.
(5) And continuously changing the parameters of the air filter screen of the air inlet hole, setting the parameters to be 0.50in Uni-foam 60PPI 91% Arr, and analyzing by the comparison step (4): the PPI value is increased to 60, the Arr capacity is increased to 91%, and the maximum temperature is 100 ℃ and the maximum air speed is 17.3m/s through thermal simulation analysis.
(6) The influence of the setting of the air filter screen parameters obtained in the steps (1) to (5) on the system heat dissipation function is changed as follows:
(a) under the condition that the PPI values are the same, the influence of different thickness parameters of the air filter screen on the heat dissipation function of the system, namely the temperature change and the air flow rate change, is different, namely the larger the thickness parameter of the air filter screen is, the highest temperature of the system is slowly increased, and the air flow rate is correspondingly increased.
(b) Under the condition that the thickness parameters of the air filter screen are the same, different PPI values have different influences on the heat dissipation function of the system, namely the PPI value is larger, the maximum temperature increase amplitude of the system is larger, and the air flow rate is correspondingly increased.
(7) And finally, analyzing the influence change of the system heat dissipation function to obtain: when the PPI value is smaller, the air filtering capacity can be improved by increasing the thickness of the air filtering net, and the speed of the heat dissipation temperature of the system is increased slowly.
The beneficial effects produced by the invention are as follows: the influence of different air filter screen parameters on system heat dissipation is analyzed by using a thermal simulation method, and the simulation analysis result is obvious. The method obtains the influence change of the air filter screen parameter setting on the system heat dissipation function. The influence change of the system heat dissipation function is analyzed to finally obtain: when the PPI value is smaller, the air filtering capacity can be improved by increasing the thickness of the air filtering net, and the speed of the heat dissipation temperature of the system is increased slowly.
Drawings
FIG. 1 is a schematic diagram of the internal structure of the system of the present invention;
FIG. 2 is a thermal simulation analysis cloud chart of the highest temperature of the system in step (1) of the present invention;
FIG. 3 is a cloud chart of thermal simulation analysis of the maximum air velocity of the system in step (1) of the present invention;
FIG. 4 is a thermal simulation analysis cloud chart of the highest temperature of the system in step (2) of the present invention;
FIG. 5 is a cloud chart of the thermal simulation analysis of the maximum air velocity of the system in step (2) of the present invention;
FIG. 6 is a cloud chart of thermal simulation analysis of the highest temperature of the system in step (3) according to the present invention;
FIG. 7 is a cloud chart of thermal simulation analysis of the maximum air velocity of the system in step (3) according to the present invention;
FIG. 8 is a thermal simulation analysis cloud chart of the highest temperature of the system in step (4) of the present invention;
FIG. 9 is a cloud chart of the thermal simulation analysis of the maximum air velocity of the system in step (4) of the present invention;
FIG. 10 is a cloud chart of thermal simulation analysis of the highest temperature of the system in step (5) according to the present invention;
FIG. 11 is a cloud chart of thermal simulation analysis of the maximum air velocity of the system in step (5) of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
As shown in fig. 1, fig. 1 is a schematic structural layout diagram of the system according to the embodiment of the present invention. This system includes quick-witted case 1, PCB board 2, sub PCB board 3, fan unit 4, the fresh air inlet 12 on the quick-witted case 1, the first heating element 21 on the PCB board 2, the second heating element 31 on the sub PCB board 3, the heat dissipation wind channel of system is: cold air enters from the air inlet 12 on the cabinet 1, and the cold air generates heat after passing through the first heating element 21 and the second heating element 31, and the heat is discharged out of the cabinet 1 under the action of the fan assembly 4.
The method comprises the following analysis steps:
(1) as shown in fig. 2 and 3, fig. 2 and 3 are simulated analysis cloud charts of the step without setting the air filter screen parameters, and it can be seen from the cloud charts that the maximum temperature of the system is 77.8 ℃ and the maximum flow rate of the air is 9.61 m/s.
(2) As shown in fig. 4 and 5, fig. 4 and 5 are simulated analysis cloud charts of the air filter screen (with a parameter of 0.25in Uni-foam 10PPI 38% Arr) set in this step, and it can be seen from the diagrams that the maximum temperature of the system is 81.6 ℃ and the maximum flow rate of air is 11.1m/s, and comparing the situation in fig. 2 and 3, it can be seen that after the air filter screen is set, the maximum temperature of the system is increased due to the increased resistance of the air inlet, and the maximum air flow rate is increased, so that the air filter screen has an influence on the heat dissipation of the system.
(3) As shown in fig. 6 and 7, fig. 6 and 7 are simulated analysis cloud charts of the air filter screen (parameter 0.25in Uni-foam 60PPI 82% Arr) set in the step, from which it can be seen that the maximum temperature of the system is 91.3 ℃ and the maximum flow rate of air is 17.4m/s, and comparing fig. 4 and 5, it can be seen that the PPI value is increased from 10 to 60, i.e. the number of holes per inch length is increased, the aperture is decreased, the resistance of the air inlet system is increased, the temperature inside the system is continuously increased (Δ T =91.3-81.6=9.7 ℃), and the air flow rate is increased.
(4) As shown in FIGS. 8 and 9, FIGS. 8 and 9 are simulated analysis cloud charts of the air filter screen (parameter 0.50in Uni-foam 10PPI 63% Arr) set in the step, and the maximum temperature of the system is 84 ℃ and the maximum air speed is 13.2m/s according to the simulated cloud charts. Comparing the situations in fig. 4 and 5, it can be seen that, in the case that the PPI value is maintained, the thickness of the airstrainer is increased, the dust blocking ratio is also increased, resulting in an increase in the resistance of the air intake system, and thus the temperature of the system is increased.
(5) As shown in FIG. 10 and FIG. 11, FIG. 10 and FIG. 11 are simulated analysis cloud charts of the air filter screen (parameter 0.50in Uni-foam 60PPI 91% Arr) set in this step, and the maximum temperature of the system is 100 ℃ and the maximum air speed is 17.3m/s through the simulated analysis. Comparing the cases shown in fig. 8 and 9, when the thickness of the air filter net becomes larger, the temperature rise of the system is larger (Δ T =100-84=16 ℃); in contrast to the situation of fig. 4, in the case where the PPI values are all 60, the screen thickness is multiplied and the filtration capacity of the air filter screen is not improved much (Δ H =91% -82% = 9%), but the temperature of the system continues to rise (Δ T =100-91.3=8.7 ℃).
(6) The influence of the setting of the air filter screen parameters obtained in the steps (1) to (5) on the system heat dissipation function is changed as follows:
(a) under the condition that the PPI values are the same, the influence of different thickness parameters of the air filter screen on the heat dissipation function of the system, namely the temperature change and the air flow rate change, is different, namely the larger the thickness parameter of the air filter screen is, the highest temperature of the system is slowly increased, and the air flow rate is correspondingly increased.
(b) Under the condition that the thickness parameters of the air filter screen are the same, different PPI values have different influences on the heat dissipation function of the system, namely the PPI value is larger, the maximum temperature increase amplitude of the system is larger, and the air flow rate is correspondingly increased.
(7) And finally, analyzing the influence change of the system heat dissipation function to obtain: when the PPI value is smaller, the air filtering capacity can be improved by increasing the thickness of the air filtering net, and the speed of the heat dissipation temperature of the system is increased slowly.
The above analysis gave: the increase of the air filter net has an influence on the heat dissipation of the system, and in the case of 10PPI, the temperature of the system is higher than that of the single-thickness air filter net by multiplying the thickness of the air filter net, but the filtering capacity of the air filter net is improved by nearly 1 time. In the 60PPI case, the air filtering capacity is not much different by increasing the thickness of the air filtering mesh, but the temperature of the system is still increasing.
Therefore, when the air filter screen is selected, if the PPI value is selected to be smaller, the air filter capacity can be improved by increasing the thickness of the air filter screen, and the influence on the heat dissipation of the system is relatively smaller; if the PPI value is larger, the influence of the thickness of the air filter screen on the air filtering capacity is small; therefore, the air filter screen with a thinner thickness can be selected under the condition of meeting the requirements of air on dust filtration and system heat dissipation.

Claims (1)

1. A method for analyzing influence of an air filter screen on a system heat dissipation function based on thermal simulation is disclosed, wherein the system comprises an air inlet hole arranged on a case; the method is characterized by comprising the following analysis steps:
(1) when an air inlet of the case is not provided with an air filter screen, the maximum temperature of the system is 77.8 ℃ and the maximum flow rate of air is 9.61m/s through thermal simulation analysis;
(2) when an air filter screen is arranged at an air inlet of the case, the air filter screen parameter is set to be 0.25in Uni-foam 10PPI 38% Arr, wherein in represents the thickness of the air filter screen, PPI represents the average hole number in unit inch of length, the more holes represent the smaller holes, Arr represents the dust blocking capacity of the air filter screen, Uni-foam represents a single air filter screen, and when the thickness of the air filter screen is set to be 0.25in, the PPI value is 10, and the Arr capacity is 38%; the maximum temperature of the system is 81.6 ℃ and the maximum flow velocity of air is 11.1m/s through thermal simulation analysis;
(3) changing the parameters of the air filter screen of the air inlet hole, setting the parameters to be 0.25in Uni-foam 60PPI 82% Arr, and analyzing by the comparison step (2): when the thickness of the air filter screen is set to be 0.25in, the PPI value is increased to 60, the Arr capacity is increased to 82%, the maximum temperature of the system is 91.3 ℃ and the maximum flow rate of air is 17.4m/s through thermal simulation analysis;
(4) and continuously changing the parameters of the air filter screen of the air inlet hole, setting the parameters to be 0.50in Uni-foam 10PPI 63% Arr, and analyzing by the comparison step (2): the thickness of the air filter screen is changed to 0.50in, which is twice that of the step (2), the Arr capacity is improved to 63%, the maximum temperature of the system is 84 ℃ and the maximum air speed is 13.2m/s through thermal simulation analysis;
(5) and continuously changing the parameters of the air filter screen of the air inlet hole, setting the parameters to be 0.50in Uni-foam 60PPI 91% Arr, and analyzing by the comparison step (4): the PPI value is increased to 60, the Arr capacity is increased to 91%, and the maximum temperature is 100 ℃ and the maximum air speed is 17.3m/s through thermal simulation analysis;
(6) the influence of the setting of the air filter screen parameters obtained in the steps (1) to (5) on the system heat dissipation function is changed as follows:
(a) under the condition that the PPI values are the same, different thickness parameters of the air filter screen have different influences on the heat dissipation function of the system, namely the temperature change and the air flow rate change, namely the larger the thickness parameter of the air filter screen is, the slower the highest temperature of the system is increased, and the air flow rate is correspondingly increased;
(b) under the condition that the thickness parameters of the air filter screen are the same, different PPI values have different influences on the heat dissipation function of the system, namely the higher the PPI value is, the higher the maximum temperature increase amplitude of the system is, and the air flow rate is correspondingly increased;
(7) and finally, analyzing the influence change of the system heat dissipation function to obtain: when the PPI value is smaller, the air filtering capacity is improved by increasing the thickness of the air filtering net, and the speed of the heat dissipation temperature of the system is increased slowly.
CN202011291773.1A 2020-11-18 2020-11-18 Method for analyzing influence of air filter screen on system heat dissipation function based on thermal simulation Withdrawn CN112329361A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109451709A (en) * 2018-12-07 2019-03-08 天津光电通信技术有限公司 A kind of radiator structure using hot simulation analysis method design communication equipment
CN110232206A (en) * 2019-04-28 2019-09-13 广东工业大学 The thermal Distortion Simulation method of Pulsed power device based on ANSYS

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109451709A (en) * 2018-12-07 2019-03-08 天津光电通信技术有限公司 A kind of radiator structure using hot simulation analysis method design communication equipment
CN110232206A (en) * 2019-04-28 2019-09-13 广东工业大学 The thermal Distortion Simulation method of Pulsed power device based on ANSYS

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
王永豪: ""典型散热器热分析及优化设计平台开发"", 《中国优秀博硕士学位论文全文数据库(硕士) 工程科技Ⅱ辑》 *
邓科等: ""基于 CFD 的机房热环境的数值模拟与优化"", 《自动化与仪器仪表》 *

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