CN107037078A - One kind heat exchange finishing coat heat transfer property test system - Google Patents
One kind heat exchange finishing coat heat transfer property test system Download PDFInfo
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- CN107037078A CN107037078A CN201710160049.7A CN201710160049A CN107037078A CN 107037078 A CN107037078 A CN 107037078A CN 201710160049 A CN201710160049 A CN 201710160049A CN 107037078 A CN107037078 A CN 107037078A
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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
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Abstract
The invention discloses one kind heat exchange finishing coat heat transfer property test system, including boiling pool, the boiling pool is connected with condenser, the boiling pool includes housing, and the housing upper end is connected with upper cover plate, and the housing lower end is connected with lower cover, hole is provided with the lower cover, the hole, which is used to place below test piece, the lower cover, is additionally provided with bottom platen, and heat-insulated silicagel pad and heat-conducting patch are provided between the lower cover and the bottom platen；Also include heater, the heater includes D.C. regulated power supply and ceramic heating flake, in addition to data collecting system, and the data collecting system includes some thermocouples, temperature polling instrument and host computer.The present invention has broad applicability, the testing device for heat transferring performance of high performance-price ratio to be a kind of, with simple to operate, changes easy, and test piece processing request is simple, test the characteristics of precise and stable property is good.
Description
Technical field
Patent of the present invention is related to a kind of heat exchange finishing coat heat transfer property test system, belongs to the test of industrial products heat transfer property
Field.
Background technology
Heat exchanger is one of essential large industry equipment in industrial production, heat exchanger with material selection ground country and
Industry relevant criterion.Continuing to develop and innovating with process for modifying surface, researcher is different by being prepared on heat-transfer surface
Types of coatings realizes augmentation of heat transfer, has industrially been applied.For design of heat exchanger personnel, novel reinforced heat transfer
Coating and structure will improve heat transfer coefficient of heat exchanger, strengthen heat-transfer effect.But not to augmentation of heat transfer in existing design standard
The influence of coating heat exchanging device heat transfer coefficient is clearly defined, and is referred to more in the form of empirical parameter for designer, or is needed
Carrying out heat transfer property test acquisition related data can be checked, and cause heat exchanger heat exchange efficiency design load to be deposited with actual value
In certain deviation.
Further, since heat exchanger structure is more and complexity, although small-sized heat-exchanger rig can be passed through and carry out heat transfer property survey
Examination, obtains the heat transfer coefficient and heat transfer property of novel reinforced heat transfer coating, but its experiment condition is limited and shadow by other factors
Ring, required result can not be obtained completely or normally carries out performance test.For example with magnetron sputtering technique, ion implantation technique
The augmentation of heat transfer coating of preparation, due to being limited by preparation technology of coating, large area prepares coating will increase heat transfer property test
Cost, and non-tablet heat-transfer surface also limit these coatings heat transfer property test.
Therefore, for the heat transfer property of coating prepared by all kinds of process for modifying surface, it is necessary to which exploitation is a kind of to be had extensively
The testing device for heat transferring performance of applicability, high performance-price ratio.
The content of the invention
In order to overcome the shortcoming and deficiency that other existing testing device for heat transferring performance are present, it is an object of the invention to provide
One kind heat exchange finishing coat heat transfer property test system.
The present invention is easy to test the heat flow density curve of different coating, with simple to operate, changes easy, test is accurate steady
Qualitative good the characteristics of.
The present invention is adopted the following technical scheme that：One kind heat exchange finishing coat heat transfer property test system, including boiling pool, it is described
Boiling pool is connected with condenser, and the boiling pool includes housing, and the housing upper end is connected with upper cover plate, and the housing lower end connects
It is connected on lower cover, the lower cover and is provided with hole, the hole is used to place is additionally provided with below test piece, the lower cover
Bottom platen, is provided with heat-insulated silicagel pad and heat-conducting patch between the lower cover and the bottom platen；
Also include heater, the heater includes D.C. regulated power supply and ceramic heating flake, and the ceramic heating flake leads to
Cross heat-conducting glue to be bonded on the heat-conducting patch, the ceramic heating flake is connected with the D.C. regulated power supply；
Also include data collecting system, the data collecting system includes some thermocouples, temperature polling instrument and host computer,
The thermocouple is positioned on the lower cover or the test piece or heat-conducting patch, and the thermocouple connects with temperature polling instrument
Connect, described temperature polling instrument is connected with the host computer.
It is preferred that, the upper cover plate is provided with the groove matched with the housing upper end, the lower cover and is provided with
Seal washer is provided with the groove matched with the housing lower end, the groove.
It is preferred that, the groove is circular groove, and the circular groove coordinates with the cylindrical gap of the housing upper and lower side, institute
Housing upper and lower end face is stated to seal using flat seal packing ring.
It is preferred that, the upper cover plate, lower cover, housing are fixedly connected with the part of bottom platen four by bolt.
It is preferred that, the Kong Weichang and width are 10mm square hole, and the interlude in the both sides of the square hole is offered directly
Footpath is 1mm half slot, and the test piece is placed in the square hole and directly contacted with the heat-conducting patch, the thermocouple
It is placed in the half slot and the test piece contacts side surfaces.
It is preferred that, it is 10mm's that correspondence test piece position, which offers size for long and width, in the middle of the thermal conductive silicon rubber cushion
Square hole.
It is preferred that, the heat-conducting patch is placed on heat-insulated silicagel pad third side hole site masking square hole.
It is preferred that, diameter 30mm circular holes are offered in the middle of the bottom platen.
It is preferred that, the quantity of the thermocouple is five, and the first thermocouple and the second thermocouple are separately mounted to the survey
The side of trial work part, three thermocouple and the 4th thermocouple are separately mounted to any two points position on the heat-conducting patch, the 5th
The installation of TC is in the lower cover.
It is preferred that, the temperature polling instrument records the thermocouple measurement data and by data according to the sample frequency of setting
It is connected with control signal by R232 communication interfaces with the host computer.
Compared to other testing device for heat transferring performance, positive effect of the invention is：
(1) present invention is simple to test piece processing request, and test piece dimensioned precision and surface roughness are not
It is particularly limited, is adapted to the block test of various metals or nonmetallic and size for 10mm × 10mm × 3mm (length × width × height)
Workpiece.
(2) used test Workpiece structure of the present invention is simple, meets structural requirement of the various process for modifying surface to workpiece, small
Dimension workpiece can reduce new coating and prepare cost, the need for meeting high cost process for modifying surface.
(3) present invention is simple in construction, and fixed test station makes test piece simple installation, without other fastening means
Fastening, workpiece dismantles similarly simplicity after being completed, without dismantling device dismounting.
(4) it present invention can be suitably applied to the heat transfer property test of heat exchange finishing coat, it may also be used for other special-shaped heating surface heat transfers
Performance test.
(5) present invention can be used for the new use material heat transfer property test of heat exchanger.
Brief description of the drawings
Fig. 1 is a kind of structural representation for the finishing coat heat transfer property test system that exchanges heat of the present invention.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
The finishing coat heat transfer property test system as shown in figure 1, one kind exchanges heat, including boiling pool, the boiling pool are connected with
Condenser 1, the boiling pool includes housing 2, and the upper end of housing 2 is connected with upper cover plate 3, and the lower end of housing 2 is connected with down
Hole is provided with cover plate 4, the lower cover 4, the hole is used to place test piece 14, and the lower section of lower cover 4 is additionally provided with
Bottom platen 6, is provided with heat-insulated silicagel pad 7 and heat-conducting patch 8 between the lower cover 4 and the bottom platen 6, wherein, spiral shell
The through hole of bolt through bottom platen 6 and lower cover 4 compresses heat-insulated silicagel pad 7 and heat-conducting patch 8, reaches sealing effectiveness；
Also include heater, the heater includes D.C. regulated power supply 10 and ceramic heating flake 9, the ceramic heating flake
9 are bonded on the heat-conducting patch 8 by heat-conducting glue, and the ceramic heating flake 9 is connected with the D.C. regulated power supply 10；
Also include data collecting system, the data collecting system includes some thermocouples, temperature polling instrument 12 and upper
Machine 13, the thermocouple is positioned on the lower cover 4 or the test piece 14 or heat-conducting patch 8, the thermocouple and temperature
Degree logging 12 is connected, and described temperature polling instrument 12 is connected with the host computer 13.
The present invention concrete technical scheme in, the upper cover plate 3 be provided with the upper end of housing 2 match it is recessed
It is provided with groove, the lower cover 4 in the groove matched with the lower end of housing 2, the groove and is provided with seal washer 5；
The groove is circular groove, and the circular groove coordinates with the cylindrical gap of the upper and lower side of housing 2, the upper and lower side of housing 2
Face is sealed using flat seal packing ring；The upper cover plate 3, lower cover 4, housing 2 and the part of bottom platen 6 four pass through bolt
It is fixedly connected.
Specifically, the Kong Weichang and width are 10mm square hole, the interlude in the both sides of the square hole is offered directly
Footpath is 1mm half slot, and the test piece 14 is placed in the square hole directly to be contacted with the heat-conducting patch 8, the heat
Galvanic couple is placed in the half slot and the contacts side surfaces of test piece 14.Correspondence test work in the middle of the heat-insulated silicagel pad 7
The position of part 14 offers the square hole that size is 10mm for long and width, and the heat-conducting patch 8 is placed on the heat-insulated third side of silicagel pad 7
Hole site is covered offers diameter 30mm circular holes in the middle of square hole, the bottom platen 6.
In the concrete technical scheme of the present invention, the quantity of the thermocouple is five, the first thermocouple 111 and the second heat
Galvanic couple 112 is separately mounted to the side of the test piece 14, and the thermocouple 114 of three thermocouple 113 and the 4th is separately mounted to
Any two points position on the heat-conducting patch 8, the 5th thermocouple 115 is arranged on the lower cover 4, the temperature polling instrument 12
The thermocouple measurement data are recorded according to the sample frequency of setting and data and control signal are passed through into R232 communication interfaces and institute
Host computer 13 is stated to connect.
Embodiment one
With reference to Fig. 1, a kind of heat exchange finishing coat heat transfer property test system of the invention, by condenser 1, boiling pool, heating
Device and data collecting system composition.
The condenser 1 is connected with boiling pool, is specifically connected to the intermediate throughholes of upper cover plate 3, for working medium in assembling supporting member 2
Working medium during boiling, gas condensation is flowed back in boiling pool, while separately opening connects extraneous to upper cover plate 3, keeps boiling in test process
Stable gas pressure in pond is risen, an atmospheric pressure is remained.
Described boiling pool includes housing 2, upper cover plate 3, lower cover 4, seal washer 5, bottom platen 6, heat-insulated silicagel pad 7
With heat-conducting patch 8.Described housing 2 is transparent acrylic, and housing 2 is arranged between upper cover plate 3 and lower cover 4, and housing is about 2
Cylindrical and upper cover plate 3, the groove match of lower cover 4 are held, is that gap coordinates assembly precision, described seal washer 5 is placed
In a groove, sealing effectiveness is realized.
Described heat-insulated silicagel pad 7, heat-conducting patch 8 are placed between bottom platen 6 and lower cover 4, in heat-insulated silicagel pad 7
Between open up size and the length and width identical square opening of test piece 14.Described bottom platen 6 and lower cover 4 passes through side by bolt
The through hole connection opened up at edge, is rotary with nut, pad pretension on bolt, turn nut make bottom platen 6 and lower cover 4 compress every
Hot silicagel pad 7, heat-conducting patch 8, reach sealing effectiveness.Four edges of described upper cover plate 3, lower cover 4 and bottom platen 6
Through hole is equipped with, upper cover plate 3, lower cover 4 and bottom platen 6 are coupled by fastening by the through hole of bolt through four edges,
Turn nut crush seal circle reaches sealing effectiveness on bolt.Applying fluid sealant when this constructional device is than tradition assembling has preferably close
Effect, and convenient disassembly are sealed, it is dexterous, it is attractive in appearance.
Described heater is made up of ceramic heating flake 9 and D.C. regulated power supply 10.Ceramic heat in described heater
Piece 9 is bonded on heat-conducting patch 8 by heat-conducting glue, and this method reduces heater element mounting structure space, is easily installed and more
Change different type heater element.The output positive and negative charge of D.C. regulated power supply 11 and ceramic heating flake 9 are positive and negative in described heater
Pole pin connection, adjusts the voltage output numerical value of D.C. regulated power supply 12, realizes the output heat flow density control of ceramic heating flake 9.
Described data collecting system is made up of thermocouple, temperature polling instrument 12 and host computer 13, and wherein thermocouple has five
It is individual, it is thermocouple 111, thermocouple 112, thermocouple 113, thermocouple 114 and thermocouple 115 respectively.Thermocouple 111 and thermocouple
112 are separately mounted to the side of test piece 14, and thermocouple 113 and thermocouple 114 are separately mounted to any two points on heat-conducting patch 8
Position, thermocouple 115 is arranged on lower cover 4.Thermocouple 11 in described data collecting system is connected with temperature polling instrument 12,
Described temperature polling instrument 12 records the measurement data of thermocouple 11 according to the sample frequency of setting and leads to data and control signal
R232 communication interfaces are crossed to be connected with host computer 13.
Described upper cover plate 3, the material of lower cover 4 are epoxy resin board, with the effect that waterproof is adiabatic.
The described material of heat-insulated silicagel pad 7 is heat-insulated silica gel.
The described material of heat-conducting patch 8 is red copper.
A kind of heat exchange finishing coat heat transfer property test system of the present invention, before specifically used, carries out corresponding beam worker
Make, to ensure the Stability and veracity of test.First, it will be placed into after heat conductive silica gel appropriate in the coated on bottom side of test piece 14
It is slight to be firmly compacted in the square opening of lower cover 4, make the bottom surface of test piece 14 be combined closely completely with heat-conducting patch 8, thermocouple
111 and thermocouple 112 insert respectively in the square opening interlude half slot of lower cover 4, make thermocouple temperature measurement contact and test piece
14 contacts side surfaces, and ensure that heat transfer medium cannot be introduced into half slot with a small amount of insulating cement closing semicircle slotted eye, it is ensured that thermocouple
Temperature measurement accuracy；Thermocouple 113 and thermocouple 114 are adhesive at heat-conducting patch 8 any two with insulation, position is close proximity to pottery
Porcelain heating plate 9, insulating cement will cover thermocouple temperature measurement contact, it is ensured that thermometric is not influenced by ambient temperature；The insulation of thermocouple 115
It is adhesive on lower cover 4, its thermometric contact is without covering, it is ensured that the temperature of boiling medium can be accurately measured during thermometric.Thermocouple
Exit is connected the collection into trip temperature with temperature polling instrument 12.Then, injection boiling medium, general to use deionized water conduct
Seethe with excitement medium.Finally, D.C. regulated power supply 10 is opened, by controlling output current to adjust the heating power of ceramic heating flake 9, is opened
Open temperature polling instrument 12 and host computer 13, by temperature polling instrument 12 carry control software record thermocouple 111, thermocouple 112,
Thermocouple 113, thermocouple 114, the temperature logs and data result of thermocouple 115, the preparation so tested just are completed.
In test process, experiment test scheme and parameter are formulated according to the property of the face coat of test piece 14, passed through
D.C. regulated power supply 10 changes the heating power of ceramic heating flake 9 to adjust the temperature of test piece 14, the wherein He of thermocouple 111
The temperature-measuring results average value of thermocouple 112 is the face coat temperature of test piece 14, thermocouple 113 and the temperature-measuring results of thermocouple 114
Average value is the output temperature of ceramic heating flake 9, and thermocouple 115 is boiling medium temperature, the standing state such as needs before each thermometric steady
Fixed laggard trip temperature collection.Heat transfer efficiency in test piece 14 is multiplied by (according to experiment by the heating power of ceramic heating flake 9
Data, 12% or so of net quantity of heat is accounted for by lower cover 4, heat-insulated silicagel pad 7 and the dispersed heat of heat-conducting patch 8), obtain
The heat flow density of the face coat of test piece 14.Utilize heat flow density divided by the corresponding surface degree of superheat (surface of test piece 14
Coating temperature subtracts boiling medium temperature), that is, obtain the heat transfer coefficient under the face coat degree of superheat.Meanwhile, it is close with hot-fluid
Spend for ordinate, the surface degree of superheat is abscissa, draws the coating boiling heat transfer curve.Terminate this time to test afterwards, and change
The uncoated matrix of same type of material and new boiling heat transfer medium, the test proceeded as described above, so as to have by comparative analysis
The heat transfer coefficient and boiling heat transfer curve of coated substrate and uncoated matrix, evaluate coating heat transfer property.In test process, if
When increasing by 9 heating power of ceramic heating flake, Coated Surface Temperature Coated Surface Temperature corresponding with a upper heating power is found
Compare, be higher by more than 30K, then the heat flow density under the state is the critical heat flux density of coating, to be now momentarily turned off direct current
Voltage-stabilized power supply 10, prevents equipment to be burned out.
For those skilled in the art, technical scheme that can be as described above and design, make other each
It is kind corresponding to change and deform, and all these change and deformation should all belong to the protection model of the claims in the present invention
Within enclosing.
Claims (10)
1. one kind heat exchange finishing coat heat transfer property test system, it is characterised in that：Including boiling pool, the boiling pool is connected with cold
Condenser, the boiling pool includes housing, and the housing upper end is connected with upper cover plate, and the housing lower end is connected with lower cover, institute
State and hole is provided with lower cover, the hole, which is used to place below test piece, the lower cover, is additionally provided with bottom platen, described
Heat-insulated silicagel pad and heat-conducting patch are provided between lower cover and the bottom platen；
Also include heater, the heater includes D.C. regulated power supply and ceramic heating flake, and the ceramic heating flake is by leading
Hot glue is bonded on the heat-conducting patch, and the ceramic heating flake is connected with the D.C. regulated power supply；
Also include data collecting system, the data collecting system includes some thermocouples, temperature polling instrument and host computer, described
Thermocouple is positioned on the lower cover or the test piece or heat-conducting patch, and the thermocouple is connected with temperature polling instrument,
Described temperature polling instrument is connected with the host computer.
2. a kind of heat exchange finishing coat heat transfer property test system according to claim 1, it is characterised in that：The upper cover plate
Be provided be provided with the groove matched with the housing upper end, the lower cover with the housing lower end match it is recessed
Seal washer is provided with groove, the groove.
3. a kind of heat exchange finishing coat heat transfer property test system according to claim 2, it is characterised in that：The groove is
Circular groove, the circular groove coordinates with the cylindrical gap of the housing upper and lower side, and the housing upper and lower end face is close using plane
Seal washer is sealed.
4. a kind of heat exchange finishing coat heat transfer property test system according to claim 1, it is characterised in that：The upper lid
Plate, lower cover, housing are fixedly connected with the part of bottom platen four by bolt.
5. a kind of heat exchange finishing coat heat transfer property test system according to claim 1, it is characterised in that：The Kong Weichang
It is 10mm square hole with width, the interlude in the both sides of the square hole offers a diameter of 1mm half slot, the test work
Part is placed in the square hole and directly contacted with the heat-conducting patch, and the thermocouple is placed in the half slot to be surveyed with described
Trial work part contacts side surfaces.
6. a kind of heat exchange finishing coat heat transfer property test system according to claim 1, it is characterised in that：The thermal conductive silicon
Correspondence test piece position offers the square hole that size is 10mm for long and width in the middle of rubber cushion.
7. a kind of heat exchange finishing coat heat transfer property test system according to claim 1, it is characterised in that：The heat conduction patch
Piece is placed on heat-insulated silicagel pad third side hole site masking square hole.
8. a kind of heat exchange finishing coat heat transfer property test system according to claim 1, it is characterised in that：The bottom pressure
Diameter 30mm circular holes are offered in the middle of plate.
9. a kind of heat exchange finishing coat heat transfer property test system according to claim 1, it is characterised in that：The thermocouple
Quantity be five, the first thermocouple and the second thermocouple are separately mounted to the side of the test piece, three thermocouple and
4th thermocouple is separately mounted to any two points position on the heat-conducting patch, and the 5th the installation of TC is in the lower cover.
10. a kind of heat exchange finishing coat heat transfer property test system according to claim 1, it is characterised in that：The temperature
Logging records the thermocouple measurement data according to the sample frequency of setting and communicates data and control signal by R232
Interface is connected with the host computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710160049.7A CN107037078A (en) | 2017-03-17 | 2017-03-17 | One kind heat exchange finishing coat heat transfer property test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710160049.7A CN107037078A (en) | 2017-03-17 | 2017-03-17 | One kind heat exchange finishing coat heat transfer property test system |
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| Publication Number | Publication Date |
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| CN107037078A true CN107037078A (en) | 2017-08-11 |
Family
ID=59534501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710160049.7A Pending CN107037078A (en) | 2017-03-17 | 2017-03-17 | One kind heat exchange finishing coat heat transfer property test system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108844992A (en) * | 2018-06-21 | 2018-11-20 | 西安交通大学 | A kind of drawing-in type electronic chip cooling boiling enhanced heat transfer experimental device and method |
| CN108966613A (en) * | 2018-09-13 | 2018-12-07 | 济南铁路天龙高新技术开发有限公司 | A kind of electronic device for realizing dehumidifying by condensation |
| CN109085487A (en) * | 2018-08-07 | 2018-12-25 | 河海大学常州校区 | A kind of online collection device of LED electric heating signal |
| CN109406573A (en) * | 2018-12-10 | 2019-03-01 | 江苏赛诺格兰医疗科技有限公司 | It is a kind of for testing the test device and test method of thermal conductive silicon rubber mat thermal conductivity |
| CN109744881A (en) * | 2017-11-06 | 2019-05-14 | 深圳天赋健医疗器械科技有限公司 | A kind of drinker cold liner radiator buckled mounting structure |
| CN109991266A (en) * | 2019-03-22 | 2019-07-09 | 上海工程技术大学 | The laser of interface heat exchange coefficient and material thermal conductivity heats measuring device and method |
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| CN102565119A (en) * | 2010-12-14 | 2012-07-11 | 中国航空工业集团公司沈阳发动机设计研究所 | Method for measuring cooling effect and thermal insulation effect of turbine blade with thermal barrier coating |
| CN103323488A (en) * | 2013-06-17 | 2013-09-25 | 华南理工大学 | Strengthened boiling heat transfer testing device and testing method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109744881A (en) * | 2017-11-06 | 2019-05-14 | 深圳天赋健医疗器械科技有限公司 | A kind of drinker cold liner radiator buckled mounting structure |
| CN108844992A (en) * | 2018-06-21 | 2018-11-20 | 西安交通大学 | A kind of drawing-in type electronic chip cooling boiling enhanced heat transfer experimental device and method |
| CN108844992B (en) * | 2018-06-21 | 2020-03-17 | 西安交通大学 | Suction type electronic chip cooling boiling enhanced heat exchange experimental device and method |
| CN109085487A (en) * | 2018-08-07 | 2018-12-25 | 河海大学常州校区 | A kind of online collection device of LED electric heating signal |
| CN108966613A (en) * | 2018-09-13 | 2018-12-07 | 济南铁路天龙高新技术开发有限公司 | A kind of electronic device for realizing dehumidifying by condensation |
| CN109406573A (en) * | 2018-12-10 | 2019-03-01 | 江苏赛诺格兰医疗科技有限公司 | It is a kind of for testing the test device and test method of thermal conductive silicon rubber mat thermal conductivity |
| CN109406573B (en) * | 2018-12-10 | 2021-03-02 | 江苏赛诺格兰医疗科技有限公司 | Testing device and testing method for testing heat conductivity of heat-conducting silica gel pad |
| CN109991266A (en) * | 2019-03-22 | 2019-07-09 | 上海工程技术大学 | The laser of interface heat exchange coefficient and material thermal conductivity heats measuring device and method |
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Application publication date: 20170811 |