CN115586212A - Ice thermal conductivity coefficient measuring device based on transient hot zone method - Google Patents
Ice thermal conductivity coefficient measuring device based on transient hot zone method Download PDFInfo
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- CN115586212A CN115586212A CN202211186959.XA CN202211186959A CN115586212A CN 115586212 A CN115586212 A CN 115586212A CN 202211186959 A CN202211186959 A CN 202211186959A CN 115586212 A CN115586212 A CN 115586212A
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- tropical
- thermal conductivity
- conductivity coefficient
- transient
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/42—Low-temperature sample treatment, e.g. cryofixation
Abstract
The invention discloses an ice thermal conductivity coefficient measuring device based on a transient tropical method, which comprises an insulation can, a refrigeration assembly, a measuring circuit and a calculation module, wherein the insulation can is arranged in the insulation can; the refrigerating assembly refrigerates the heat insulation box; the measuring circuit comprises a constant-current voltage-stabilized power supply, a tropical A, a tropical B, a tropical C and a standard resistor which are connected in series. The device of the invention adopts three hot belts, which can eliminate the influence of self-heating temperature rise in the process of current introduction of a heat source and improve the measurement precision of the ice thermal conductivity coefficient; the device adopts the thin tropical zone with the thickness of only 0.15mm, and the tropical zone is in full contact with the sample to be measured, so the measurement precision is high; the device of the invention realizes the integration of ice making and measurement, and improves the practicability of the device; the device can measure the heat conductivity coefficient of ice, can also measure loose materials, porous media and non-metallic solid materials, can be used for measuring metal materials after the surface of the heat band is covered with a thin insulating layer, and has wide application range.
Description
Technical Field
The invention relates to the technical field of measurement, in particular to an ice thermal conductivity coefficient measuring device based on a transient tropical method.
Background
The heat conductivity coefficient is a parameter for representing the heat conductivity of the material, and has an important role in the fields of chemical engineering, energy, power engineering and the like. The measurement of the thermal conductivity of ice is of great significance to the research of the thermal performance parameters of frozen soil. Common thermal conductivity measurement methods can be divided into steady state measurement and transient measurement. The steady-state measurement method needs longer time for establishing a stable temperature place, has low measurement efficiency, and has strict requirements on the adiabatic condition of a measurement system and the size of a sample.
Transient measurements work well to overcome the above-mentioned disadvantages of the steady state method. In the transient method, heat interference is applied to a sample in thermal balance, and the heat conductivity coefficient of the sample material to be tested is calculated by testing the change of the internal temperature field of the sample and combining an unsteady heat conduction differential equation. Compared with a steady-state method, the transient method has the advantages that under the condition of an external stable heat source, the response of the sample temperature to time does not need to reach thermal balance, the testing time is short, the influence of factors such as thermal contact resistance on the measuring precision is small, the temperature range and the measuring range are wide, and the precision is high.
Disclosure of Invention
1. Technical problem to be solved
The technical problem to be solved by the invention is to provide an ice thermal conductivity coefficient measuring device based on a transient tropical method, so as to solve the problems that the measuring time is long and the measuring precision needs to be improved in the prior art.
2. Technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: an ice thermal conductivity coefficient measuring device based on a transient tropical method comprises an insulation can, a refrigeration assembly, a measuring circuit and a calculating module; the refrigerating assembly refrigerates the heat preservation box; the measuring circuit comprises a constant current voltage-stabilized power supply, a tropical A, a tropical B, a tropical C and a standard resistor which are connected in series; the tropical A, the tropical B and the tropical C are arranged in the heat preservation box, and the installation positions of the tropical A, the tropical B and the tropical C are packaged by a polytetrafluoroethylene film; two ends of each tropical zone are connected with a voltmeter in parallel, and the measuring circuit is connected with an ammeter in series; the computing module is installed on the outer wall of the heat insulation box.
In the ice thermal conductivity coefficient measuring device based on the transient tropical method, the insulating layer of the heat preservation box is made of rigid polyurethane foam.
The ice thermal conductivity coefficient measuring device based on the transient tropical method is characterized in that the calculation module comprises a single chip microcomputer; the input end of the single chip microcomputer is connected with the voltage measuring module INA226 and the current measuring module ACS712, and the output end of the single chip microcomputer is connected with the display module.
The ice thermal conductivity coefficient measuring device based on the transient hot zone method is characterized in that the single chip microcomputer is an STM32 series single chip microcomputer.
The ice thermal conductivity coefficient measuring device based on the transient tropical method comprises a semiconductor refrigerator, a power adapter and a temperature controller, wherein the power adapter and the temperature controller are matched with the semiconductor refrigerator.
The ice thermal conductivity coefficient measuring device based on the transient hot band method is characterized in that the hot band A and the hot band B are made of platinum wires.
The ice thermal conductivity measuring device based on the transient hot band method is characterized in that the hot band C is made of nickel-chromium alloy.
The ice thermal conductivity coefficient measuring device based on the transient hot zone method is characterized in that the dimensions of the hot zone A, the hot zone B and the hot zone C are 240mm long and 0.15mm thick.
The ice thermal conductivity coefficient measuring device based on the transient hot zone method is characterized in that the central distance between the hot zone B7 and the hot zone C8 is 0.3mm, and the central distance between the hot zone A6 and the hot zone B7 is 16.8mm.
The ice thermal conductivity coefficient measuring device based on the transient hot zone method further comprises a K-type thermocouple temperature instrument, and the K-type thermocouple temperature instrument is used for calibrating the hot zone and measuring the temperature of the ice sample.
3. Advantageous effects
In conclusion, the beneficial effects of the invention are as follows:
(1) The device of the invention adopts three hot belts, which can eliminate the influence of self-heating temperature rise in the process of current introduction of a heat source and improve the measurement precision of the ice thermal conductivity coefficient;
(2) The device adopts the thin tropical zone with the thickness of only 0.15mm, and the tropical zone is in full contact with the sample to be measured, so the measurement precision is high;
(4) The device of the invention realizes the integration of ice making and measurement, and improves the practicability of the device;
(5) The device of the invention can measure the heat conductivity coefficient of ice, can also measure loose materials, porous media and non-metallic solid materials, can be used for measuring metal materials after the surface of the heat band is covered with a thin insulating layer, and has wide application range.
Drawings
FIG. 1 is a schematic structural diagram of an ice thermal conductivity measuring device based on a transient tropical method according to the present invention;
FIG. 2 is a schematic diagram of a measuring circuit of the ice thermal conductivity measuring device based on the transient hot zone method according to the present invention;
fig. 3 is a schematic view of the installation of the thermal band of the ice thermal conductivity measuring device based on the transient thermal band method.
In the figure: 1-insulation box; 2-a refrigeration component; 3-a measurement circuit; 4-a calculation module; 5-constant current stabilized voltage power supply; 6-Tropical A; 7-tropic B; 8-tropical C; 9-standard resistance; 10-a voltmeter; 11-an ammeter; 12-a semiconductor refrigerator; 13-a power adapter; 14-a temperature controller; model 15-K thermocouple thermometer.
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.
Referring to fig. 1 to fig. 3, the present invention provides a technical solution: an ice thermal conductivity coefficient measuring device based on a transient tropical method comprises an incubator 1, a refrigeration assembly 2, a measuring circuit 3 and a calculation module 4; the refrigerating assembly 2 refrigerates the heat insulation box 1; the measuring circuit 3 comprises a constant-current voltage-stabilized power supply 5, a tropical A6, a tropical B7, a tropical C8 and a standard resistor 9 which are connected in series; the tropical A6, the tropical B7 and the tropical C8 are arranged in the heat preservation box 1, and the installation positions are packaged by a polytetrafluoroethylene film; two ends of each tropical zone are connected with a voltmeter 10 in parallel, and the measuring circuit 3 is connected with an ammeter 11 in series; and the computing module 4 is arranged on the outer wall of the heat preservation box 1.
Preferably, the heat insulation layer of the heat insulation box 1 is made of rigid polyurethane foam plastic, so that the heat insulation effect is good, and the shock resistance and the pressure resistance can be realized.
Preferably, the calculation module 4 comprises a single chip microcomputer; the input end of the single chip microcomputer is connected with the voltage measuring module INA226 and the current measuring module ACS712, and the output end of the single chip microcomputer is connected with the display module. The calculation module 4 collects current and voltage signals in the measurement circuit 2, and then realizes data processing and calculation through the programming of the single chip microcomputer, so that the heat conductivity coefficient of the sample to be measured can be obtained.
Preferably, the single chip microcomputer is an STM32 series single chip microcomputer.
Preferably, the refrigeration assembly 2 comprises a semiconductor refrigerator 12, and a power adapter 13 and a temperature controller 14 adapted thereto, in particular a 6-core semiconductor refrigerator with a refrigeration power of 420W. The test is carried out in the environment of 20 ℃ at room temperature, the minimum temperature of the semiconductor refrigerating machine on the refrigerating aluminum sheet can reach-18 ℃, the environment temperature of a low-temperature laboratory can reach-10 ℃, and the environment temperature requirement required by the experiment is met. The power supply adopts an SP-305 type adjustable direct current stabilized power supply (30V 5A), and can keep the output of a stabilized voltage (CV) or a Constant Current (CC). In order to prevent the thermal damage of the polytetrafluoroethylene electrical insulation material caused by overhigh temperature of the tropical zone, the stable output current of the constant current power supply can be adjusted to be 0.2A-0.5A.
Preferably, the tropical zone A6 and the tropical zone B7 are made of platinum wires, the tropical zone C8 is made of nickel-chromium alloy, in order to eliminate the influence of the temperature rise of the heat source due to the self-heating of the tropical zone during the current supply process, so that the measurement result of the thermal conductivity is more accurate, 3 tropical zones (240 mm long and 0.15mm thick) with the same length are adopted, as shown in fig. 3, the distance between the centers of the tropical zone B7 and the tropical zone C8 is 0.3mm, and the distance between the centers of the tropical zone A6 and the tropical zone B7 is 16.8mm. Wherein, the C tropical zone is used as a heat source to provide heat for a surrounding medium, and the A tropical zone and the B tropical zone are used as temperature sensors to monitor the temperature change of the positions of the tropical zones.
Preferably, a type K thermocouple thermometer 15 is further included, the type K thermocouple thermometer 15 being used for calibrating hot bands and measuring the temperature of ice samples.
Different from the traditional tropical method, the device adopts three tropical belts, wherein one tropical belt is used as a heat source, and the other two tropical belts are used as temperature sensors, so that the influence caused by self-heating temperature rise of the heat source in the process of current introduction is eliminated, and the measurement precision of the ice thermal conductivity coefficient is improved. Under the condition of allowable cost, the thermal band made of the platinum-rhodium alloy is used as a temperature sensor, so that the accuracy of the measurement of the thermal conductivity coefficient is further improved. Later preparation CaCl is added into water 2 And the like to further study the influence of impurities on the thermal conductivity of ice. The experimental device can theoretically measure the heat conductivity coefficient of most solid materials with the ambient temperature ranging from-15 ℃ to room temperature, has a large measurement range and high universality, and is expected to be popularized and applied in the fields of experimental teaching and industrial production. In addition, the device not only innovates an experimental measurement method, but also combines software and hardware to act on a traditional physical experiment, and has an incentive effect on creating a more intelligent physical experiment instrument for students.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An ice thermal conductivity coefficient measuring device based on a transient hot zone method is characterized in that: comprises a heat preservation box (1), a refrigeration component (2), a measuring circuit (3) and a calculation module (4); the refrigerating assembly (2) refrigerates the heat insulation box (1); the measuring circuit (3) comprises a constant-current voltage-stabilized power supply (5), a tropical A (6), a tropical B (7), a tropical C (8) and a standard resistor (9) which are connected in series; the tropical A (6), the tropical B (7) and the tropical C (8) are arranged in the heat preservation box (1), and the installation positions are packaged by a polytetrafluoroethylene film; a voltmeter (10) is connected in parallel at two ends of each tropical zone, and the measuring circuit (3) is connected with an ammeter (11) in series; the computing module (4) is arranged on the outer wall of the heat preservation box (1).
2. An ice thermal conductivity coefficient measuring device based on the transient tropical method according to claim 1, characterized in that: the heat insulation layer of the heat insulation box (1) is made of rigid polyurethane foam plastic.
3. An ice thermal conductivity coefficient measuring device based on the transient tropical method according to claim 1, characterized in that: the computing module (4) comprises a singlechip; the input end of the single chip microcomputer is connected with the voltage measuring module INA226 and the current measuring module ACS712, and the output end of the single chip microcomputer is connected with the display module.
4. An ice thermal conductivity coefficient measuring device based on the transient tropical method according to claim 3, characterized in that: the singlechip is an STM32 series singlechip.
5. An ice thermal conductivity coefficient measuring device based on the transient tropical method according to claim 1, characterized in that: the refrigeration assembly (2) comprises a semiconductor refrigerator (12), a power adapter (13) and a temperature controller (14) which are matched with the semiconductor refrigerator.
6. An ice thermal conductivity coefficient measuring device based on the transient tropical method according to claim 1, characterized in that: the tropical band A (6) and the tropical band B (7) are made of platinum wires.
7. An ice thermal conductivity coefficient measuring device based on the transient tropical method according to claim 6, characterized in that: the tropical C (8) is made of nichrome.
8. An ice thermal conductivity coefficient measuring device based on transient tropical method according to claim 7, characterized in that: the dimensions of the tropical zone A (6), the tropical zone B (7) and the tropical zone C (8) are 240mm long and 0.15mm thick.
9. An ice thermal conductivity coefficient measuring device based on the transient hot band method according to claim 8, characterized in that: the central distance between the tropical zone B (7) and the tropical zone C (8) is 0.3mm, and the central distance between the tropical zone A (6) and the tropical zone B (7) is 16.8mm.
10. An ice thermal conductivity coefficient measuring device based on the transient tropical method according to claim 1, characterized in that: the device also comprises a K-type thermocouple thermometer (15), wherein the K-type thermocouple thermometer (15) is used for calibrating the hot band and measuring the temperature of the ice sample.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211186959.XA CN115586212A (en) | 2022-09-28 | 2022-09-28 | Ice thermal conductivity coefficient measuring device based on transient hot zone method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211186959.XA CN115586212A (en) | 2022-09-28 | 2022-09-28 | Ice thermal conductivity coefficient measuring device based on transient hot zone method |
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| CN115586212A true CN115586212A (en) | 2023-01-10 |
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| CN202211186959.XA Pending CN115586212A (en) | 2022-09-28 | 2022-09-28 | Ice thermal conductivity coefficient measuring device based on transient hot zone method |
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- 2022-09-28 CN CN202211186959.XA patent/CN115586212A/en active Pending
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