CN108956686B - Method for measuring real-time heat transfer capacity of irregular solid wall surface - Google Patents
Method for measuring real-time heat transfer capacity of irregular solid wall surface Download PDFInfo
- Publication number
- CN108956686B CN108956686B CN201810695447.3A CN201810695447A CN108956686B CN 108956686 B CN108956686 B CN 108956686B CN 201810695447 A CN201810695447 A CN 201810695447A CN 108956686 B CN108956686 B CN 108956686B
- Authority
- CN
- China
- Prior art keywords
- heat
- measuring
- wall surface
- patch
- characteristic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity
Abstract
The invention discloses a method for measuring real-time heat transfer capacity of an irregular solid wall surface. The invention is based on the non-contact infrared measurement principle, avoids the damage to the wall surface of the measured object and the disturbance of the temperature field and the thermal flow field of the wall surface of the measured object in the traditional method in the installation process of the device, can adapt to the alternating influence of the flow condition, the temperature and the pressure of the fluid in the cavity type measured object, has wide measurement range of the heat flux density, and can reach the maximum heat flux density measurement value of 106An order of magnitude.
Description
Technical Field
The invention relates to the technical field of thermal detection, in particular to a method for measuring real-time heat transfer capacity of an irregular solid wall surface.
Background
In many fields of industrial production and civil life, especially in the research field related to unsteady heat conduction coupling problem, the acquisition and measurement of real-time heat transfer quantity are widely concerned in various fields of industrial field, environmental protection, civil life and the like.
The existing real-time heat transfer quantity acquisition mode mainly deduces corresponding heat flow density by measuring temperature differences at different distances along the heat flow transfer direction through a thermocouple, and further obtains the heat transfer quantity of a research object. However, due to the presence of the thermocouple, thermal contact resistance is inevitably generated between the object to be measured and the measuring element, and interference is generated to the external environment of the object to be measured. Especially, when the measured object is large in area and irregular in shape, the measurement difficulty and cost are higher.
In addition, if the wall surface of the object to be measured is simultaneously influenced by the flowing condition of the fluid therein, the alternating influence of the temperature and the pressure and the combined action of external environment parameters (temperature, humidity, wind speed and the like), great challenges are brought to the acquisition of the heat flux density and the real-time heat transfer quantity of the unsteady heat transfer coupling problem under the action of complex parameters.
Disclosure of Invention
The invention aims to provide a method for measuring the heat flux density and the real-time heat transfer quantity of a large-area irregular solid wall surface, which can accurately measure the heat flux density and the real-time heat transfer quantity of the large-area irregular solid wall surface in real time under the action of complex internal and external environments, has small disturbance on a measured object and is wide in application field.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a method for measuring real-time heat transfer capacity of an irregular solid wall surface, which comprises the following steps:
step 1: dividing a characteristic grid;
selecting an irregular solid wall surface as a measured wall surface, measuring the temperature distribution of the measured wall surface through an infrared imaging device, and dividing a plurality of characteristic grids for the measured wall surface according to the characteristics of the temperature distribution and the shape characteristics of the measured wall surface;
step 2: selecting a characteristic measuring point of a characteristic grid;
selecting representative positions from the feature grids in the step 1 as feature measuring points, wherein the feature measuring points are used for replacing the whole area of the feature grids;
and step 3: manufacturing a measuring patch;
the method comprises the following steps of (1) manufacturing measurement patches by adopting a plurality of materials with different heat conductivities, wherein the shapes and the sizes of the heat conductive materials of the measurement patches are the same;
and 4, step 4: placing a measuring patch;
closely attaching the measuring patch to the characteristic measuring points in each characteristic grid on the wall surface to be measured;
and 5: acquiring temperature parameters of the characteristic measuring points;
reading the feature at different positions by an infrared imaging deviceSurface temperature T of different heat conduction materials of characterization measuring pointi1、Ti2……Tin；
Step 6: calculating the heat flux density at the measuring patch;
because the measuring patch is made of a plurality of determined heat conduction materials, and the heat conductivities lambda of various heat conduction materials1、λ2……λnEmissivity of various heat conducting materials is known1、2……nGiven that the heat-conducting materials are of uniform thickness and are all L, the heat flow density q obtained by the different heat-conducting materials of the measurement patch is then knowni1、qi2……qinAre all equal;
because the heat flow density values of different heat conduction materials of the characteristic measuring point are equal, the heat flow density values of any two heat conduction materials are selected according to the formula 1 to calculate the temperature T of the irregular solid wall surface at the characteristic measuring pointjEquation 1 is as follows:
finishing to obtain: the measured wall temperature T at the characteristic measurement pointj：
Wherein q isi1、qi2The heat flow density of two heat conduction materials in the patch is measured respectively, and the unit is W/square meter; lambda [ alpha ]1、λ2The thermal conductivities, in W/m.k, of the two thermally conductive materials in the measurement patch, respectively; t isi1、Ti2Surfaces of two heat-conducting materials in the measuring patch respectivelyTemperature in units of; t isjThe temperature of the bottom surface of the two heat conduction materials in the measuring patch, which is tightly attached to a measured object, is measured in units of temperature; l is1、L2The thicknesses of the two heat conduction materials at the measuring point are respectively consistent and uniform, namely: l is1＝L2(ii) a The unit is m;
calculating the heat flux density in any characteristic grid in the measured wall surface according to the following formula 2, wherein the formula 2 is as follows:
or
……
Or
Wherein q isi1、qi2……qinCalculating the heat flow density of the irregular solid wall surface at the measuring point for a plurality of determined heat conduction materials in a single measuring patch, wherein the unit is W/square meter; lambda [ alpha ]1、λ2……λnThe heat conductivity of a plurality of heat conduction materials at the measuring point is respectively in W/m & lt k & gt; t isi1、Ti2……TinThe surface temperature of a plurality of heat conduction materials at the measuring point is expressed in unit; l is1、L2……LnThe thickness of a plurality of heat conduction materials at the measuring point is consistent and uniform, and the unit is m;
and 7: calculating and calculating the total heat transfer quantity Q of the measured wall surface;
calculating the heat flux density of the characteristic measuring points in different characteristic grids according to a formula 2 in the step 6, and calculating the real-time heat transfer quantity of any grid of the measured wall surface according to a following formula 3, wherein the formula 3 is as follows:
Qi＝Ai·qi
wherein Q isiThe heat transfer capacity of the characteristic grid is W, AiThe unit is square meter for the area of the characteristic grid.
Calculating the total heat transfer quantity of each characteristic grid of the wall surface of the measured object according to the following formula 4, wherein the formula 4 is as follows:
wherein Q is the total heat transfer quantity of each characteristic grid on the wall surface of the measured object, and the unit is W; and N is the number of the divided grids.
Preferably, in the step 1 of dividing the feature grids, the feature grids are divided into grids with different degrees of compactness according to the nonuniformity of the heat flow of the detected wall surface; dividing the characteristic grids into grids of different shapes according to the shape characteristics of the detected wall surface;
preferably, in the step 3 of manufacturing the measurement patch, at least two or more materials with different thermal conductivities are selected;
preferably, a middle heat insulation material is arranged between materials with different heat conductivities in the measurement patch, and a side heat insulation material is arranged on the side part of the measurement patch;
preferably, one side of the measuring patch, which is attached to the wall surface to be measured, is coated with heat-conducting silica gel;
preferably, in the step 6 of calculating the heat flow density at the measurement patch, the heat flow density q of the measured wall surface at the measurement point is calculated according to the heat conduction materials determined by the plurality of types in the single measurement patchi1、qi2……qinComparing the above heat flux density qi1、qi2……qinNumerical values:
if all the calculated heat flow density values q are presenti1、qi2……qinAll deviations are in the range of 2% -5%, then the measurement patch is valid;
if the calculated heat flux density q isi1、qi2……qinOne third of the valueIf the deviation between more than two values is within the range of 2% -5%, selecting most results for the heat flow density value of the measuring point, and aging the measuring patch part;
if the calculated heat flux density q isi1、qi2……qinA deviation between values less than two-thirds of the values is in the range of 2% to 5%, the measurement patch is aged and needs to be replaced.
Compared with the prior art, the invention has the following technical effects:
1. the method is based on the non-contact infrared measurement principle, avoids the damage to the wall surface of the measured object and the disturbance of the temperature field and the thermal flow field of the wall surface of the measured object in the installation process of the device in the traditional method, does not need an external cable compared with the traditional classical measurement method, and improves the measurement precision, the economy and the applicability.
2. The method can flexibly arrange the measuring points according to the structural characteristics and the heat flow distribution of the measured object, and improves the accuracy and the application range of the measuring method.
3. The method is suitable for measuring the large-area irregular solid wall surface, and can flexibly divide the grids according to the shape and the heat flow distribution of the irregular solid wall surface, so that the accuracy and the application range of the measuring method are further improved.
4. The method can adapt to the flowing condition of fluid in a cavity type measured object, the alternating influence of temperature and pressure, and the change influence of external environment parameters (temperature, humidity, wind speed and the like), and has the characteristic of wide application range.
5. The method has the advantages of simple principle, clear steps, easy realization, wide measurement range of the heat flux density, and the maximum heat flux density measurement value of 106An order of magnitude.
6. Q of the inventioni1、qi2……qinThe heat flux density values obtained by a plurality of different heat conduction materials can be checked mutually, more accurate and effective data can be selected from a plurality of data, and the reliability and precision of the measuring point data are greatly improvedAccuracy; meanwhile, the measuring patch is formed by splicing a plurality of different heat conduction materials, and the real-time heat transfer quantity of the measured object can be calculated according to each heat conduction material. In the use process, several kinds of heat conduction materials can be flexibly selected from the plurality of heat conduction materials to be used as effective heat conduction materials, and the service life of the patch measuring point is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of the method for measuring real-time heat transfer of an irregular solid wall according to the present invention;
FIG. 2 is a schematic diagram of the internal modules of the real-time heat transfer measurement apparatus of the present invention;
FIG. 3 is a schematic view of an infrared imaging module in the inventive real-time heat transfer measurement apparatus;
FIG. 4 is a schematic view of an inventive cylinder measurement patch;
FIG. 5 is a schematic view of an irregular solid wall of the invention;
the device comprises a tested object 1, a tested patch 2, an infrared imaging device 3, a data transmission device 4, a data processing center 5, heat-conducting silica gel 6, a tested wall 1-1, grid lines 1-2, a cylindrical measuring patch 1-3, a lateral heat-insulating material 2-1, a laminating device 2-2 and a middle heat-insulating material 2-3.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1:
as shown in fig. 1-5, this embodiment is a further description of the specific implementation process and the operation principle of the method for measuring real-time heat transfer of irregular solid wall surface according to the present invention.
As shown in fig. 1, in the method for measuring the real-time heat transfer amount of the irregular solid wall surface of the embodiment, the irregular solid is a measured object 1, the wall surface of the measured object 1 is a measured wall surface 1-1, a measurement patch 2 is arranged on the measured wall surface 1-1, temperature information of the measurement patch 2 is collected by an infrared imaging device 3, and is transmitted to a data processing center 5 through a data transmission device 4 for processing, so as to finally obtain the total heat transfer amount of the measured wall surface 1-1 of the whole measured object 1. The method is suitable for measuring the large-area irregular solid wall surface, and can flexibly divide the grids according to the shape and the heat flow distribution of the irregular solid wall surface, so that the accuracy and the application range of the measuring method are further improved.
The specific measurement method comprises the following steps:
s001: dividing a characteristic grid;
as shown in fig. 4, an irregular solid wall surface is selected as a measured wall surface 1-1, the temperature distribution of the measured wall surface 1-1 is measured through an infrared imaging device 3, and a plurality of characteristic grids are divided for the measured wall surface 1-1 according to the characteristics of the temperature distribution and the shape characteristics of the measured wall surface 1-1; because the temperature distribution of different areas of the measured wall surface 1-1 is different, the areas with different temperature distributions are separated by grid lines 1-2, and finally the measured wall surface 1-1 is divided into n characteristic grids of different areas.
As shown in fig. 5, the feature grids are divided into grids with different degrees of compactness according to the non-uniformity of the heat flow of the measured wall surface 1-1; dividing the characteristic grids into grids of different shapes according to the shape characteristics of the detected wall surface 1-1; in fig. 5, triangular meshes are shown, but the shape of the mesh may be rectangular or polygonal, depending on the actual situation.
S002: selecting a characteristic measuring point of a characteristic grid;
selecting representative positions from the feature grids in the S001 as feature measuring points, wherein the feature measuring points are used for replacing the whole area of the feature grids; the purpose of the feature measurement points in this embodiment is to select points in the feature grid that can represent the temperature of the entire grid area in preparation for subsequent heat transfer acquisition. The method can flexibly arrange the measuring points according to the structural characteristics and the heat flow distribution of the measured object, and improves the accuracy and the application range of the measuring method.
S003: manufacturing a measuring patch;
referring to fig. 3, the measurement patch 2 of the present embodiment uses three materials with large differences in thermal conductivity, specifically, aluminum, stainless steel and red copper, and the three materials are made into cylindrical measurement patches 1-3, each material has the same thickness, shape and size, and is in a sector shape of 120 °.
The middle heat-insulating material 2-3 is also arranged among the three heat-conducting materials, and the three heat-conducting materials are separated by the middle heat-insulating material 2-3, so that the heat insulation of the three heat-conducting materials is ensured; the side face of the cylinder measuring patch 1-3 is coated by a side face heat insulation material 2-1, so that heat flow is guaranteed to be transmitted along the axial direction of the measuring patch 2 in a one-dimensional mode, meanwhile, the attaching device 2-2 is arranged on the periphery of the cylinder measuring patch 1-3, so that the cylinder measuring patch 1-3 can be tightly arranged on a measured object 1, and when the measured object 1 is a steel air storage tank, the attaching device 2-2 can be a magnetic ring.
S004: placing a measuring patch;
as shown in fig. 2, a measuring patch 2 is closely attached to a characteristic measuring point in each characteristic grid on a measured wall surface 1-1; in the embodiment, when the cylindrical measurement patch 1-3 is adhered, the axial direction of the cylindrical measurement patch 1-3 is ensured to be perpendicular to the irregular solid wall surface at the characteristic measurement point, and the heat-conducting silica gel 6 is coated between the bottom surface of the cylindrical measurement patch 1-3 and the wall surface of the object to be measured 1, so that the thermal contact resistance between the cylindrical measurement patch 1-3 and the wall surface 1-1 to be measured is reduced, and further the actual heat transfer quantity of the wall surface 1-1 to be measured is obtained.
S005: acquiring temperature parameters of the characteristic measuring points;
measuring the surface temperature T of the three heat-conducting materials of the cylindrical measurement patches 1-3 by means of the infrared imaging device 3i1、Ti2、Ti3. Based on the non-contact infrared measurement principle, the damage to the wall surface of the measured object 1 and the disturbance of the temperature field and the thermal flow field of the wall surface of the measured object 1 in the installation process of the device in the traditional method are avoided, meanwhile, compared with the traditional classical measurement method, an external cable is not needed, and the measurement precision, the economical efficiency and the applicability are improved.
S006: calculating the heat flux density at the measuring patch;
in S005, the acquired data is transmitted to the data processing center 5 through the data transmission device 4 in real time, and the data is processed, calculated and analyzed by the data processing center 5, so as to obtain the heat flux density and the real-time heat transfer amount of the object 1 to be measured.
The method for calculating and analyzing the data specifically comprises the following processes:
since the cylindrical measuring patches 1-3 are made of three determined heat conducting materials, and the heat conductivities lambda of the various heat conducting materials1、λ2、λ3Emissivity of various heat conducting materials is known1、2、3Knowing that the heat-conducting materials are of uniform thickness and all L, the heat flow density q obtained by the different heat-conducting materials of the cylindrical measurement patches 1-3 is obtainedi1、qi2、qi3Are all equal;
because the heat flow density values of different heat conduction materials of the characteristic measuring point are equal, the heat flow density values of any two heat conduction materials are selected according to the formula 1 to calculate the temperature T of the irregular solid wall surface at the characteristic measuring pointjEquation 1 is as follows:
finishing to obtain: 1-1 temperature T of measured wall surface at characteristic measuring pointj：
Wherein q isi1、qi2Measuring the heat flow density of two heat conduction materials in the patches 1-3 respectively for cylinders, wherein the unit is W/square meter; lambda [ alpha ]1、λ2The thermal conductivity in W/m.k is measured for the cylinders of the two thermally conductive materials in the patches 1-3, respectively; t isi1、Ti2Respectively measuring the surface temperatures of two heat conduction materials in the patches 1-3 for the cylinders, wherein the unit is; t isjMeasuring the bottom surface temperature of two heat conduction materials in the patches 1-3 tightly attached to the object to be measured 1 for the cylinder, wherein the unit is; l is1、L2The thickness of two kinds of heat conduction materials in measurement point department is respectively, and the thickness of two kinds of heat conduction materials is unanimous and even, promptly: l is1＝L2(ii) a The unit is m;
according to the following formula 2, the heat flow density in any characteristic grid in the measured wall surface 1-1 can be calculated, wherein the formula 2 is as follows:
or
……
Or
Wherein q isi1、qi2、qi3Calculating the heat flow density of the irregular solid wall surface at the measuring point for three determined heat conducting materials in the single cylinder measuring patch 1-3, wherein the unit is W/square meter; lambda [ alpha ]1、λ2、λ3Three at each measuring pointThe thermal conductivity of the seed thermal conductive material, in W/m.k; t isi1、Ti2……TinThe surface temperatures of three heat conduction materials at a measuring point are measured in units of; l is1、L2、L3The thickness of three heat conduction materials at the measuring point is consistent and uniform, and the unit is m.
The calculation principle described above can be used to determine whether the cylinder measuring patches 1-3 are valid or not.
In the calculation of the heat flux density at the measurement patch 2, the heat flux density q of the measured wall surface 1-1 at the measurement point is calculated from the several kinds of heat conduction materials determined in the single measurement patch 2i1、qi2……qinComparing the above heat flux density qi1、qi2……qinNumerical values:
if all the calculated heat flow density values q are presenti1、qi2……qinThe measurement patch 2 is valid if the deviations are all in the range of 2% to 5%;
if the calculated heat flux density q isi1、qi2……qinIf the deviation between more than two thirds of the values is within the range of 2% -5%, selecting most results for the heat flow density values of the measuring points, and measuring the partial aging of the patch 2;
if the calculated heat flux density q isi1、qi2……qinIf the deviation between the values less than two thirds of the values is within the range of 2% to 5%, the measurement patch 2 is aged and the measurement patch 2 needs to be replaced.
Only all calculated heat flow density values qi1、qi2、qi3And if the deviations are all within the range of 2% -5%, the cylinder measuring patch 1-3 is effective, and the data acquired by the cylinder measuring patch 1-3 can be continuously calculated.
Q of the inventioni1、qi2……qinThe heat flux density values obtained by a plurality of different heat conduction materials can be checked mutually, more accurate and effective data can be selected from a plurality of data, and the reliability and the accuracy of the measuring point data are greatly improved; at the same time measureThe measuring patch 2 is formed by splicing a plurality of different heat conduction materials, and the real-time heat transfer quantity of the measured object 1 can be calculated according to each heat conduction material. In the use process, several kinds of heat conduction materials can be flexibly selected from a plurality of heat conduction materials to be used as effective heat conduction materials, so that the service life of the patch measuring point is prolonged
S007: calculating and calculating the total heat transfer quantity Q of the measured wall surface 1-1;
calculating the heat flux density of the characteristic measuring points in different characteristic grids according to a formula 2 in S006, and calculating the real-time heat transfer quantity of any grid of the measured wall surface 1-1 according to a following formula 3, wherein the formula 3 is as follows:
Qi＝Ai·qi
wherein Q isiThe heat transfer capacity of the characteristic grid is W, AiThe unit is square meter for the area of the characteristic grid.
Calculating the total heat transfer quantity of each characteristic grid of the wall surface of the measured object 1 according to the following formula 4, wherein the formula 4 is as follows:
wherein Q is the total heat transfer quantity of each characteristic grid on the wall surface of the measured object 1, and the unit is W; and N is the number of the divided grids.
The method for measuring the real-time heat transfer quantity of the irregular solid wall surface can adapt to the alternating influence of the flow condition, the temperature and the pressure of fluid in a cavity-type measured object and the change influence of external environment parameters (temperature, humidity, wind speed and the like), has the characteristic of wide application range, and has the advantages of simple principle, clear steps, easy realization, wide measurement range of heat flow density, and the maximum measured value of the heat flow density of 106An order of magnitude.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. A method for measuring real-time heat transfer capacity of an irregular solid wall surface is characterized by comprising the following steps: the method comprises the following steps:
step 1: dividing a characteristic grid;
selecting an irregular solid wall surface as a measured wall surface, measuring the temperature distribution of the measured wall surface through an infrared imaging device, and dividing a plurality of characteristic grids for the measured wall surface according to the characteristics of the temperature distribution and the shape characteristics of the measured wall surface;
step 2: selecting a characteristic measuring point of a characteristic grid;
selecting representative positions from the feature grids in the step 1 as feature measuring points, wherein the feature measuring points are used for replacing the whole area of the feature grids;
and step 3: manufacturing a measuring patch;
the method comprises the following steps of (1) manufacturing measurement patches by adopting a plurality of materials with different heat conductivities, wherein the shapes and the sizes of the heat conductive materials of the measurement patches are the same;
and 4, step 4: placing a measuring patch;
closely attaching the measuring patch to the characteristic measuring points in each characteristic grid on the wall surface to be measured;
and 5: acquiring temperature parameters of the characteristic measuring points;
reading the surface temperature T of different heat conduction materials of the characteristic measuring points at different positions through an infrared imaging devicei1、Ti2……Tin；
Step 6: calculating the heat flux density at the measuring patch;
because the measuring patch is made of a plurality of determined heat conduction materials, and the heat conductivities lambda of various heat conduction materials1、λ2……λnEmissivity of various heat conducting materials is known1、2……nIt is known that the thickness of the heat-conducting material is uniform and is L, and the heat-conducting material is obtained by different heat-conducting materials of the measuring patchHeat flux density qi1、qi2……qinAre all equal;
because the heat flow density values of different heat conduction materials of the characteristic measuring point are equal, the heat flow density values of any two heat conduction materials are selected according to the formula 1 to calculate the temperature T of the irregular solid wall surface at the characteristic measuring pointjEquation 1 is as follows:
finishing to obtain: the measured wall temperature T at the characteristic measurement pointj：
Wherein q isi1、qi2The heat flow density of two heat conduction materials in the patch is measured respectively, and the unit is W/square meter; lambda [ alpha ]1、λ2The thermal conductivities, in W/m.k, of the two thermally conductive materials in the measurement patch, respectively; t isi1、Ti2The surface temperatures of two heat conduction materials in the measuring patch are respectively measured, and the unit is; t isjThe temperature of the bottom surface of the two heat conduction materials in the measuring patch, which is tightly attached to a measured object, is measured in units of temperature; l is1、L2The thicknesses of the two heat conduction materials at the measuring point are respectively consistent and uniform, namely: l is1＝L2(ii) a The unit is m;
calculating the heat flux density in any characteristic grid in the measured wall surface according to the following formula 2, wherein the formula 2 is as follows:
or
……
Or
Wherein q isi1、qi2……qinCalculating the heat flow density of the irregular solid wall surface at the measuring point for a plurality of determined heat conduction materials in a single measuring patch, wherein the unit is W/square meter; lambda [ alpha ]1、λ2……λnThe heat conductivity of a plurality of heat conduction materials at the measuring point is respectively in W/m & lt k & gt; t isi1、Ti2……TinThe surface temperature of a plurality of heat conduction materials at the measuring point is expressed in unit; l is1、L2……LnThe thickness of a plurality of heat conduction materials at the measuring point is consistent and uniform, and the unit is m;
and 7: calculating the total heat transfer quantity Q of the measured wall surface;
calculating the heat flux density of the characteristic measuring points in different characteristic grids according to a formula 2 in the step 6, and calculating the real-time heat transfer quantity of any grid of the measured wall surface according to a following formula 3, wherein the formula 3 is as follows:
Qi＝Ai·qi
wherein Q isiThe heat transfer capacity of the characteristic grid is W, AiThe unit is square meter for the area of the characteristic grid;
calculating the total heat transfer quantity of each characteristic grid of the wall surface of the measured object according to the following formula 4, wherein the formula 4 is as follows:
wherein Q is the total heat transfer quantity of each characteristic grid on the wall surface of the measured object, and the unit is W; and N is the number of the divided grids.
2. The method for measuring the real-time heat transfer capacity of the irregular solid wall surface according to claim 1, wherein the method comprises the following steps: in the step 1, dividing the feature grids into grids with different compactness degrees according to the nonuniformity of the heat flow of the detected wall surface; and dividing the characteristic grids into grids of different shapes according to the shape characteristics of the detected wall surface.
3. The method for measuring the real-time heat transfer capacity of the irregular solid wall surface according to claim 1, wherein the method comprises the following steps: in the step 3 of manufacturing the measurement patch, two or more materials having different thermal conductivities are selected.
4. The method for measuring the real-time heat transfer capacity of the irregular solid wall surface according to claim 3, wherein the method comprises the following steps: and a middle heat insulation material is arranged between the materials with different heat conductivities in the measurement patch, and a side heat insulation material is arranged on the side part of the measurement patch.
5. The method for measuring the real-time heat transfer capacity of the irregular solid wall surface according to claim 4, wherein the method comprises the following steps: and one side of the measuring patch, which is attached to the wall surface to be measured, is coated with heat-conducting silica gel.
6. The method for measuring the real-time heat transfer capacity of the irregular solid wall surface according to claim 1, wherein the method comprises the following steps: in the step 6 of calculating the heat flow density at the measuring patch, the heat flow density q of the measured wall surface at the measuring point is calculated according to the heat conduction materials determined by a plurality of types in a single measuring patchi1、qi2……qinComparing the above heat flux density qi1、qi2……qinNumerical values:
if all the calculated heat flow density values q are presenti1、qi2……qinDeviation ofAll in the range of 2% to 5%, the measurement patch is valid;
if the calculated heat flux density q isi1、qi2……qinIf the deviation between more than two thirds of the values is within the range of 2% -5%, selecting most results for the heat flow density values of the measuring points, and aging the measuring patch part;
if the calculated heat flux density q isi1、qi2……qinA deviation between values less than two-thirds of the values is in the range of 2% to 5%, the measurement patch is aged and needs to be replaced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810695447.3A CN108956686B (en) | 2018-06-29 | 2018-06-29 | Method for measuring real-time heat transfer capacity of irregular solid wall surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810695447.3A CN108956686B (en) | 2018-06-29 | 2018-06-29 | Method for measuring real-time heat transfer capacity of irregular solid wall surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108956686A CN108956686A (en) | 2018-12-07 |
| CN108956686B true CN108956686B (en) | 2020-10-13 |
Family
ID=64487882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810695447.3A Active CN108956686B (en) | 2018-06-29 | 2018-06-29 | Method for measuring real-time heat transfer capacity of irregular solid wall surface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108956686B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709139A (en) * | 2019-01-07 | 2019-05-03 | 福建省产品质量检验研究院 | A kind of method of the irregular foam plastic product thermal coefficient of quick test |
| CN113567500A (en) * | 2021-08-21 | 2021-10-29 | 福州大学 | Delay detection method for transient electromagnetic thermal effect of metal buried crack tip under action of pulse current |
| CN115544818B (en) * | 2022-12-05 | 2023-02-28 | 中国空气动力研究与发展中心低速空气动力研究所 | Grid division and heat conduction calculation method for multilayer heterogeneous thin-wall solid heat conduction calculation |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0580095A (en) * | 1991-09-18 | 1993-03-30 | Hitachi Ltd | Inspecting apparatus of resistance element |
| WO2011128927A3 (en) * | 2010-04-16 | 2012-01-05 | Ermanno Grinzato | Measuring thermal parameters of a building envelope |
| CN105424972A (en) * | 2016-01-08 | 2016-03-23 | 吉林大学 | Near wall surface flow velocity measuring method and apparatus |
| CN205228682U (en) * | 2015-10-19 | 2016-05-11 | 青岛佳科恒业能源科技股份有限公司 | Ultrasonic wave calorimeter based on pressure gauge |
| CN108151885A (en) * | 2017-12-15 | 2018-06-12 | 湖南科技大学 | Non-circular profile Work piece high-speed grinding temperature Forecasting Methodology based on variable heat source model |
-
2018
- 2018-06-29 CN CN201810695447.3A patent/CN108956686B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0580095A (en) * | 1991-09-18 | 1993-03-30 | Hitachi Ltd | Inspecting apparatus of resistance element |
| WO2011128927A3 (en) * | 2010-04-16 | 2012-01-05 | Ermanno Grinzato | Measuring thermal parameters of a building envelope |
| CN205228682U (en) * | 2015-10-19 | 2016-05-11 | 青岛佳科恒业能源科技股份有限公司 | Ultrasonic wave calorimeter based on pressure gauge |
| CN105424972A (en) * | 2016-01-08 | 2016-03-23 | 吉林大学 | Near wall surface flow velocity measuring method and apparatus |
| CN108151885A (en) * | 2017-12-15 | 2018-06-12 | 湖南科技大学 | Non-circular profile Work piece high-speed grinding temperature Forecasting Methodology based on variable heat source model |
Non-Patent Citations (3)
| Title |
|---|
| 地下管道的红外成像检测法;陈书旺等;《大珩先生九十华诞文集暨中国光学学会 2004年学术大会论文集》;20040630;第41-44页 * |
| 基于红外热成像的热流分布测量技术;毛羽丰等;《红外与激光工程》;20160831;第45卷(第8期);第0804001-1-0804001-6页 * |
| 微管道内壁面轴向热流实验研究;端震 等;《南京师范大学学报(工程技术版)》;20080331;第8卷(第1期);第38-46页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108956686A (en) | 2018-12-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108956686B (en) | Method for measuring real-time heat transfer capacity of irregular solid wall surface | |
| CN104535609B (en) | A kind of heat conducting coefficient measurement device | |
| CN103411996B (en) | Solid material heat conductivity measurement mechanism and measuring method | |
| CN101126729B (en) | Double heat flux gauge steady state method for measuring material heat conductivity | |
| CN104180929B (en) | A kind of calibration steps of TR heat flow transducer | |
| CN104502402B (en) | A kind of method for measuring the hot physical property of column heat-barrier material | |
| WO2019184076A1 (en) | Method for measuring heterogeneous content of finite-thickness material based on virtual heat source principle | |
| CN113483900B (en) | Infrared radiation aluminum alloy plate temperature field measuring method based on black body point online calibration | |
| CN105806503B (en) | A kind of multiple spot film thermocouple structure for computational fluid dynamics temperature survey | |
| CN106226351B (en) | A kind of thin-wall circular tube material thermal conductivity calculation method | |
| CN105548246A (en) | Heat-conductivity-coefficient measuring experiment system through steady-state method and measuring method | |
| CN109752113A (en) | Location determining method and circuit design method in web temperature sensor and its application | |
| CN101871900A (en) | Sensor for measuring heat conduction coefficient | |
| CN103713013B (en) | Test tubulose material shaft is to the device of coefficient of heat conductivity | |
| CN110174434B (en) | Method for measuring heterogeneous content and distribution in porous material | |
| CN111879443A (en) | Tool for measuring density of gas-liquid two-phase heat flow in rocket engine | |
| CN108195879A (en) | The method that Transient Method measures material thermal conductivity and thermal diffusion coefficient | |
| Atherton et al. | A leaf-mounted thermal sensor for the measurement of water content | |
| CN109655483B (en) | Material microstructure defect detection method based on deep learning algorithm | |
| CN104913862B (en) | convective heat flow measuring method based on circular foil heat flow meter | |
| CN110852615A (en) | Comprehensive reliability evaluation model for intelligent electric energy meter in typical environment | |
| CN109307563B (en) | Measuring device for real-time heat transfer capacity of irregular solid wall surface | |
| CN111735847B (en) | Real-time online measuring device and method for two-dimensional surface heat flux density | |
| CN209342644U (en) | A kind of measuring device of grapheme material thermal conductivity | |
| CN209342643U (en) | A kind of measuring device of grapheme material thermal conductivity and interface resistance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |