CN117433821B - Method for testing heat dissipation of serial liquid cooling radiator under forced convection - Google Patents
Method for testing heat dissipation of serial liquid cooling radiator under forced convection Download PDFInfo
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- CN117433821B CN117433821B CN202311745553.5A CN202311745553A CN117433821B CN 117433821 B CN117433821 B CN 117433821B CN 202311745553 A CN202311745553 A CN 202311745553A CN 117433821 B CN117433821 B CN 117433821B
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- heat dissipation
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- 238000001816 cooling Methods 0.000 title claims abstract description 111
- 239000007788 liquid Substances 0.000 title claims abstract description 90
- 238000012360 testing method Methods 0.000 title claims abstract description 51
- 230000017525 heat dissipation Effects 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 19
- 229920006395 saturated elastomer Polymers 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 239000000463 material Substances 0.000 claims description 5
- 238000010998 test method Methods 0.000 claims description 5
- 239000002826 coolant Substances 0.000 claims description 2
- 241000234295 Musa Species 0.000 description 3
- 235000003805 Musa ABB Group Nutrition 0.000 description 3
- 235000015266 Plantago major Nutrition 0.000 description 3
- 101100149325 Escherichia coli (strain K12) setC gene Proteins 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/008—Subject matter not provided for in other groups of this subclass by doing functionality tests
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
-
- 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
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The invention relates to a method for testing heat dissipation of a series liquid cooling radiator under forced convection, belongs to the technical field of heat dissipation testing, and solves the problems that in the prior art, equipment required by the heat dissipation testing of the series liquid cooling radiator is numerous, an operation method is complex, pertinence is poor, efficiency is low, and the series liquid cooling radiator cannot be well aimed at under the condition of ensuring higher testing accuracy. The method can obtain the thermal resistance value of the serial liquid cooling radiator according to the characteristic parameters of the serial liquid cooling radiator and the physical parameters obtained by common equipment in the market, and directly test the heat dissipation of the serial liquid cooling radiator under forced convection through the steady junction temperature obtained by the characteristic parameters and the thermal resistance value, has simple and efficient operation, has good pertinence of parameter selection on the serial liquid cooling radiator, and can ensure higher test accuracy.
Description
Technical Field
The invention belongs to the technical field of heat dissipation test, and particularly relates to a method for testing heat dissipation of a serial liquid cooling radiator under forced convection.
Background
The radiator is a common heat dissipation device, and the working performance and cost of the machine equipment are directly determined by the quality of heat dissipation performance and whether the heat dissipation requirement of the machine equipment is matched with the heat dissipation requirement of the machine equipment. How to accurately and simply test the performance of a radiator becomes particularly important, there are a great number of performance testing methods for a radiator, such as chinese patent application publication No. CN113504062 a.
The serial liquid cooling radiator is one of the common heat dissipation elements of power electronic components, and it is particularly important to accurately and conveniently test the heat dissipation performance of the serial liquid cooling radiator. The existing test method basically needs to install the serial liquid cooling radiator on a heating device or even complete equipment for joint test, the related test equipment comprises a pump, a constant-temperature water tank and the like, the equipment is various and high in price, the parameter selection related to the existing test method is not good for the serial liquid cooling radiator, and part of the test methods are complex, low in efficiency and poor in universality.
Disclosure of Invention
In view of the above problems, the invention provides a method for testing the heat dissipation of a series-connected liquid-cooled radiator under forced convection, which solves the problems of the prior art that the series-connected liquid-cooled radiator has the disadvantages of multiple devices, complex operation method, poor pertinence and low efficiency, and cannot be well aimed at the series-connected liquid-cooled radiator under the condition of ensuring higher testing accuracy.
The invention provides a method for testing heat dissipation of a forced convection serial liquid cooling radiator, which comprises the following steps:
step 1, collecting test parameters of a heater and test parameters of a serial liquid cooling radiator under actual working conditions;
step 2, determining the number of flow channels of the serial liquid cooling radiator based on the test parameters of the serial liquid cooling radiator;
step 3, determining the length of the flow channel and the total area of the flow channel based on the test parameters of the serial liquid cooling radiator and the number of the flow channels in the step 2;
step 4, respectively acquiring the kinematic viscosity value, the thermal conductivity value and the specific heat capacity value of the cooling working medium in the flow channel corresponding to different temperatures by using a kinematic viscosity measuring instrument, a thermal conductivity measuring instrument and a specific heat capacity measuring instrument; determining a fitting function of the thermophysical parameters and the temperature of the cooling working medium in the flow channel based on the acquired kinematic viscosity value, the thermal conductivity value and the specific heat capacity value;
step 5, collecting the current environment temperature under forced convection and the inlet flow velocity of the cooling working medium, and acquiring the convection heat exchange coefficient of the cooling working medium based on the fitting function of the step 4;
step 6, obtaining the heat convection resistance of the serial liquid cooling radiator according to the heat convection coefficient of the cooling working medium in the step 5;
step 7, determining heat conduction thermal resistance of the serial liquid cooling radiator according to the test parameters of the serial liquid cooling radiator in the step 1;
step 8, determining the total thermal resistance of the serial liquid cooling radiator based on the heat convection resistance of the step 6 and the heat conduction resistance of the step 7;
step 9, obtaining the actual steady-state junction temperature of the heater by using the parameter test value of the heater in the step 1 and the total thermal resistance of the serial liquid cooling radiator in the step 8;
step 10, testing the heat dissipation of the serial liquid cooling radiator according to the obtained actual steady-state junction temperature of the heater;
setting a heater criterion junction temperature according to the heat dissipation requirement of the power electronic components under the current actual working conditions; judging whether the obtained steady-state junction temperature of the heater in the step 9 can meet the heat dissipation requirement of the power electronic components under the current actual working condition based on the heater criterion junction temperature; if the steady-state junction temperature of the heater is smaller than or equal to the criterion junction temperature of the heater, the current serial liquid cooling radiator is good in heat dissipation performance, and the heat dissipation requirement is met; if the steady-state junction temperature of the heater is larger than the criterion junction temperature of the heater, the heat dissipation requirement is not met.
Optionally, for the serial liquid cooling radiator which does not meet the heat dissipation requirement, adjusting the actual input parameters of the serial liquid cooling radiator according to the actual working condition, and returning to the step 1 until the heat dissipation performance of the serial liquid cooling radiator corresponding to the power electronic component under the current working condition meets the heat dissipation requirement, and obtaining the structural parameters of the final serial liquid cooling radiator.
Optionally, the test parameters of the heater in step 1 include total power consumption of the heater; the test parameters of the serial liquid cooling radiator comprise the length of the serial liquid cooling radiator, the width of the serial liquid cooling radiator, the total height of the serial liquid cooling radiator, the sum of the shortest distances of the wall surfaces of the flow channels of the serial liquid cooling radiator and the two sides of the wall of the serial liquid cooling radiator, the hydraulic diameter of the flow channels of the serial liquid cooling radiator and the material heat conductivity of the serial liquid cooling radiator。
Optionally, the cooling working medium in the flow channel is saturated water.
Compared with the prior art, the invention has at least the following beneficial effects: the method can obtain the thermal resistance value of the serial liquid cooling radiator according to the characteristic parameters of the serial liquid cooling radiator and the physical parameters obtained by common equipment in the market, and directly test the heat dissipation of the serial liquid cooling radiator under forced convection through the steady junction temperature obtained by the characteristic parameters and the thermal resistance value, has simple and efficient operation, has good pertinence of parameter selection on the serial liquid cooling radiator, and can ensure higher test accuracy.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention.
FIG. 1 is a flow chart of a method for testing heat dissipation of a series-connected liquid-cooled radiator under forced convection.
Fig. 2 is a front view of a heater and a serial liquid-cooled radiator.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present invention and features in the embodiments may be combined with each other. In addition, the invention may be practiced otherwise than as specifically described and thus the scope of the invention is not limited by the specific embodiments disclosed herein.
1-2, a method for testing heat dissipation of a forced convection serial liquid cooling radiator is disclosed, comprising the following steps:
step 1, collecting test parameters of a heater and test parameters of a serial liquid cooling radiator under actual working conditions;
wherein, referring to FIG. 2, the test parameters of the heater include the total power consumption of the heaterP total The method comprises the steps of carrying out a first treatment on the surface of the The power meter is used for directly collecting the total power consumption of the heater under the actual working conditionP total ；
The test parameters of the serial liquid cooling radiator comprise the length of the serial liquid cooling radiatorL 1 Width of serial liquid cooling radiatorW 1 Total height of serial liquid cooling radiatorH 1 Respectively shortest distance sum of flow channel wall surface of serial liquid cooling radiator and two sides of serial liquid cooling radiator wallD bound Hydraulic diameter of flow channel of serial liquid cooling radiatorD h Material heat conductivity with serial liquid cooling radiatorλ mat ；
Further, the material thermal conductivity of the serial liquid cooling radiator is the thermal conductivity of the main material of the serial liquid cooling radiator.
Step 2, determining the number of flow channels of the serial liquid cooling radiator based on test parameters of the serial liquid cooling radiatorN 1 ；
Optionally, the number of the flow channels is rounded downwards;
step 3, based on the test parameters of the serial liquid cooling radiator and the number of the flow channels in the step 2N 1 Determining the length and the total area of the flow channel;
for the length of the flow channel:
if the number of flow channelsLength of flow channelL 2 The method comprises the following steps:
if the number of flow channelsLength of flow channelL 2 The method comprises the following steps:
wherein,aindicating the flow channel number limit.
Preferably, the method comprises the steps of,a=2。
for the total area of the flow channel:
if the number of flow channelsTotal area of flow channelS 1 The method comprises the following steps:
if the number of flow channelsTotal area of flow channelS 1 The method comprises the following steps:
。
step 4, respectively acquiring the kinematic viscosity values and the thermal conductivity values of the cooling working medium in the flow channel corresponding to different temperatures by using a kinematic viscosity measuring instrument, a thermal conductivity measuring instrument and a specific heat capacity measuring instrumentValues and specific heat capacity values; fitting is carried out based on the acquired kinematic viscosity value, thermal conductivity value and specific heat capacity value to respectively obtain a fitting function of kinematic viscosity and temperature of the cooling working medium in the flow channel, a fitting function of thermal conductivity and temperature of the cooling working medium in the flow channel and the Plantain number of the cooling working medium in the flow channelPrFitting function with temperature. Namely, determining a fitting function of the thermophysical parameters and the temperature of the cooling working medium in the flow channel;
optionally, the cooling working medium in the runner is saturated water;
step 41, acquiring kinematic viscosity values of saturated water corresponding to different temperatures by using a kinematic viscosity measuring instrument to obtain a kinematic viscosity data setγ data The expression is:
wherein,a value of the kinematic viscosity of saturated water representing the lower limit of the corresponding temperature interval,/->A kinematic viscosity value of saturated water corresponding to the upper limit of the temperature interval;
further, taking values according to the set temperature step length in the temperature interval; the temperature interval is minus 50 ℃ to 300 ℃, and the preset temperature step length is 1 ℃.
Step 42, based on the kinematic viscosity data setγ data Determining a fitting function of saturated water movement viscosity and temperature, wherein the expression is as follows:
。
wherein,Temprepresenting temperature;representing the functional relation of saturated water movement viscosity and temperature;a 1 、a 2 、a 3 、a 4 、a 5 、a 6 anda 7 respectively represent the fitting coefficients of the saturated water kinematic viscosity.
Taking a value according to a set temperature step length in a temperature interval; the temperature interval is between minus 50 ℃ and 300 ℃, and the fitting function of saturated water movement viscosity and temperature at the preset temperature step length of 1 ℃ is as follows:
。
step 43, collecting the heat conductivity values of the saturated water corresponding to different temperatures by using a heat conductivity tester to obtain a heat conductivity data setλ data The expression is:
wherein,a value of heat conductivity of saturated water representing a lower limit of the corresponding temperature interval,/->The thermal conductivity value of saturated water corresponding to the upper limit of the temperature interval is shown.
Step 44, thermal conductivity data set basedλ data Determining a fitting function of saturated water thermal conductivity and temperature, wherein the expression is as follows:
。
wherein,Temprepresenting temperature;indicating the heat conductivity of saturated waterλFunctional relation with temperature;b 1 、b 2 、b 3 、b 4 、b 5 、b 6 andb 7 respectively represent the fitting coefficients of the saturated water thermal conductivity.
Taking a value according to a set temperature step length in a temperature interval; the temperature interval is between minus 50 ℃ and 300 ℃, and the fitting function of the saturated water heat conductivity and the temperature at the preset temperature step length of 1 ℃ is as follows:
。
step 45, collecting specific heat capacity values of saturated water corresponding to different temperatures by using a specific heat capacity measuring instrument to obtain a specific heat capacity data set;
step 451, collecting specific heat capacity values of saturated water corresponding to different temperatures by using a specific heat capacity measuring instrument to obtain a specific heat capacity data setC pdata The expression is:
wherein,specific heat capacity value of saturated water representing the lower limit of the corresponding temperature interval, +.>A specific heat capacity value of saturated water representing a lower limit of the corresponding temperature interval;
step 452, based on specific heat capacity data setC pdata Obtaining a set of Plantnumber data for saturated waterThe expression:
wherein,a planchet number value representing saturated water corresponding to a lower limit of the temperature interval; />A planchet number value representing saturated water corresponding to a lower limit of the temperature interval; />Indicating the corresponding first in the temperature intervaliPrandtl number values of saturated water of the temperature step sizes; />Indicating that the saturated water corresponds to the first stage in the temperature rangeiSpecific heat capacity value of temperature of individual temperature steps, < >>Indicating that the saturated water corresponds to the first stage in the temperature rangeiKinematic viscosity value of temperature for each temperature step,/-)>Indicating that the saturated water corresponds to the first stage in the temperature rangeiThe thermal conductivity values of the temperatures of the individual temperature steps,i=1,2,…,n，nthe total number of temperature steps in the temperature interval is indicated.
Step 46, plantain number data set based on saturated WaterDetermination of the Plantain number of saturated WaterPrThe fitting function with temperature is expressed as:
wherein,Temprepresenting temperature;representing the Plantt number of saturated waterPr is a function of temperature;c 1 、c 2 、c 3 、c 4 、c 5 、c 6 andc 7 respectively representing the fitting coefficients of the plannchnumber of the saturated water.
Taking a value according to a set temperature step length in a temperature interval; the temperature interval is between minus 50 ℃ and 300 ℃, and the fitting function of the Pr of the saturated water and the temperature is as follows when the preset temperature step length is 1 ℃:
。
step 5, collecting the current environment temperature under forced convection and the inlet flow velocity of the cooling working medium, and acquiring the convection heat exchange coefficient of the cooling working medium based on the fitting function of the step 4;
step 51, collecting the current ambient temperature under forced convectionObtaining the saturated water kinematic viscosity at the current ambient temperature according to the fitting function of the step 4>Plantnumber of saturated Water->And saturated Water thermal conductivity->；
Taking values according to a set step length in a temperature interval; the temperature interval is minus 50 ℃ to 300 ℃, and the preset temperature step length is 1 ℃, and the expression is:
step 52, under the forced convection condition, collecting the inlet flow velocity of the cooling working medium by using a flow velocity meterDetermining a cooling medium based on the acquired inlet flow rateA convective heat transfer coefficient HTC;
。
step 6, obtaining the heat convection resistance of the serial liquid cooling radiator according to the heat convection coefficient HTC of the cooling working medium in step 5；
。
Step 7, determining the heat conduction thermal resistance of the serial liquid cooling radiator according to the test parameters of the serial liquid cooling radiator in step 1；
。
Step 8, determining the total thermal resistance of the serial liquid cooling radiator based on the convective heat transfer thermal resistance of the step 6 and the heat transfer thermal resistance of the step 7；
。
Step 9, obtaining the actual steady-state junction temperature of the heater by using the parameter test value of the heater in the step 1 and the total thermal resistance of the serial liquid cooling radiator in the step 8;
actual steady-state junction temperature of heaterThe expression of (2) is:
。
and step 10, testing the heat dissipation performance of the serial liquid cooling radiator according to the obtained actual steady-state junction temperature of the heater.
Setting a heater criterion junction temperature according to the heat dissipation requirement of the power electronic components under the current actual working conditions; judging whether the obtained steady-state junction temperature of the heater in the step 9 can meet the heat dissipation requirement of the power electronic components under the current actual working condition based on the heater criterion junction temperature; if the steady-state junction temperature of the heater is smaller than or equal to the criterion junction temperature of the heater, the current serial liquid cooling radiator is good in heat dissipation performance, and the heat dissipation requirement is met; if the steady-state junction temperature of the heater is larger than the criterion junction temperature of the heater, the current serial liquid cooling radiator has poor heat dissipation performance and cannot meet the heat dissipation requirement.
Further, for the serial liquid cooling radiator with poor heat dissipation performance of the serial liquid cooling radiator, the actual input parameters of the serial liquid cooling radiator are adjusted according to the actual working condition, and the step 1 is returned until the heat dissipation performance of the serial liquid cooling radiator corresponding to the power electronic component under the current working condition is completed to meet the heat dissipation requirement, and the structural parameters of the final serial liquid cooling radiator are obtained.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (4)
1. A method for testing heat dissipation of a serial liquid cooling radiator under forced convection is characterized by comprising the following steps:
step 1, collecting test parameters of a heater and test parameters of a serial liquid cooling radiator under actual working conditions;
step 2, determining the number of flow channels of the serial liquid cooling radiator based on the test parameters of the serial liquid cooling radiator;
step 3, determining the length of the flow channel and the total area of the flow channel based on the test parameters of the serial liquid cooling radiator and the number of the flow channels in the step 2;
step 4, respectively acquiring the kinematic viscosity value, the thermal conductivity value and the specific heat capacity value of the cooling working medium in the flow channel corresponding to different temperatures by using a kinematic viscosity measuring instrument, a thermal conductivity measuring instrument and a specific heat capacity measuring instrument; determining a fitting function of the thermophysical parameters and the temperature of the cooling working medium in the flow channel based on the acquired kinematic viscosity value, the thermal conductivity value and the specific heat capacity value;
step 5, collecting the current environment temperature under forced convection and the inlet flow velocity of the cooling working medium, and acquiring the convection heat exchange coefficient of the cooling working medium based on the fitting function of the step 4;
step 6, obtaining the heat convection resistance of the serial liquid cooling radiator according to the heat convection coefficient of the cooling working medium in the step 5;
step 7, determining heat conduction thermal resistance of the serial liquid cooling radiator according to the test parameters of the serial liquid cooling radiator in the step 1;
step 8, determining the total thermal resistance of the serial liquid cooling radiator based on the heat convection resistance of the step 6 and the heat conduction resistance of the step 7;
step 9, obtaining the actual steady-state junction temperature of the heater by using the parameter test value of the heater in the step 1 and the total thermal resistance of the serial liquid cooling radiator in the step 8;
step 10, testing the heat dissipation of the serial liquid cooling radiator according to the obtained actual steady-state junction temperature of the heater;
setting a heater criterion junction temperature according to the heat dissipation requirement of the power electronic components under the current actual working conditions; judging whether the obtained steady-state junction temperature of the heater in the step 9 can meet the heat dissipation requirement of the power electronic components under the current actual working condition based on the heater criterion junction temperature; if the steady-state junction temperature of the heater is smaller than or equal to the criterion junction temperature of the heater, the current serial liquid cooling radiator is good in heat dissipation performance, and the heat dissipation requirement is met; if the steady-state junction temperature of the heater is larger than the criterion junction temperature of the heater, the heat dissipation requirement is not met.
2. The testing method according to claim 1, wherein for the serial liquid-cooled radiator which does not meet the heat dissipation requirement, the actual input parameters of the serial liquid-cooled radiator are adjusted according to the actual working condition, and step 1 is returned until the heat dissipation performance of the serial liquid-cooled radiator corresponding to the power electronic component under the current working condition is completed to meet the heat dissipation requirement, and the structural parameters of the final serial liquid-cooled radiator are obtained.
3. The method of testing according to claim 1, wherein the test parameters of the heater in step 1 include total power consumption of the heater; the test parameters of the serial liquid cooling radiator comprise the length of the serial liquid cooling radiator, the width of the serial liquid cooling radiator, the total height of the serial liquid cooling radiator, the sum of the shortest distances of the wall surfaces of the flow channels of the serial liquid cooling radiator and the two sides of the wall of the serial liquid cooling radiator, the hydraulic diameter of the flow channels of the serial liquid cooling radiator and the material heat conductivity of the serial liquid cooling radiator.
4. A test method according to any one of claims 1 to 3, wherein the cooling medium in the flow channel is saturated water.
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