CN211741137U - Testing device for heat conductivity coefficient of semi-infinite space frozen clay - Google Patents
Testing device for heat conductivity coefficient of semi-infinite space frozen clay Download PDFInfo
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- CN211741137U CN211741137U CN202020214630.XU CN202020214630U CN211741137U CN 211741137 U CN211741137 U CN 211741137U CN 202020214630 U CN202020214630 U CN 202020214630U CN 211741137 U CN211741137 U CN 211741137U
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Abstract
The utility model relates to a semi-infinite space freezes clay coefficient of heat conductivity testing arrangement, including first low temperature water supply waters device, second low temperature water supply waters device, interior thermostated container, soil body, outer thermostated container are the circular ring column structure, and the inside wall of soil body and the lateral wall laminating of interior thermostated container, the lateral wall of soil body and the inside wall laminating of outer thermostated container; freezing pipes are inserted into the soil body at equal intervals along the circumferential direction, the first low-temperature water supply area device is communicated with the outer constant temperature box, and the second low-temperature water supply area device is communicated with the inner constant temperature box. The utility model has the advantages of reasonable design, adopt annular structural design to simulate traditional unlimited plane, realize having compensatied the vacancy of prior art to clay coefficient of heat conductivity's test.
Description
Technical Field
The utility model relates to a clay coefficient of heat conductivity test technical field, specific semi-infinite space freezes clay coefficient of heat conductivity testing arrangement that says so.
Background
The thermal conductivity is the heat transferred through a 1 square meter area of a 1m thick material under stable heat transfer conditions with a temperature difference of 1 degree K, DEG C, 1S within 1 second, and has a unit of W/m DEG W/(m DEG K), where K can be replaced by DEG C.
Thermal conductivity is only for the heat transfer form in which heat is conducted, and when other forms of heat transfer exist, such as radiation, convection, and mass transfer, the composite heat transfer relationship is often referred to as apparent, dominant, or effective thermal conductivity.
The thermal conductivity of the existing clay stays at the theoretical derivation stage, the main reason is that an infinite plane is defined when the thermal conductivity is derived, however, the infinite plane does not exist in practice, and experimental equipment cannot be used for demonstration, so that a device capable of performing simulation test on the thermal conductivity of the clay is urgently needed.
Disclosure of Invention
To the defect of above-mentioned technique, the utility model provides a semi-infinite space freezes clay coefficient of heat conductivity testing arrangement.
A testing device for heat conductivity coefficient of semi-infinite space frozen clay comprises a first low-temperature water supply water area device, a second low-temperature water supply water area device, an inner constant temperature box, a soil body and an outer constant temperature box, wherein the inner constant temperature box, the soil body and the outer constant temperature box are all in circular cylindrical structures, the inner side wall of the soil body is attached to the outer side wall of the inner constant temperature box, and the outer side wall of the soil body is attached to the inner side wall of the outer constant temperature box; freezing pipes are inserted into the soil body at equal intervals along the circumferential direction, the first low-temperature water supply area device is communicated with the outer constant temperature box, and the second low-temperature water supply area device is communicated with the inner constant temperature box.
The first low-temperature water supply area device and the second low-temperature water supply area device have the same structure and respectively comprise a low-temperature cold water area, a heating pipe, an electromagnetic valve, a condenser, a compressor and a water pump, wherein the heating pipe is arranged in the low-temperature cold water area, the output end of the compressor is connected with the condenser and the electromagnetic valve in series through pipelines in sequence and is connected into the low-temperature cold water area, and then the output end of the compressor is connected into the input end of the compressor through the pipelines; the output end of the low-temperature cold water area of the first low-temperature water supply area device is connected with the water pump in series through a pipeline and then is connected onto the outer constant temperature box, and the input end of the low-temperature cold water area of the first low-temperature water supply area device is connected onto the outer constant temperature box through a pipeline; the output end of the low-temperature cold water area of the second low-temperature water supply area device is connected with the water pump in series through a pipeline and then is connected to the inner constant temperature box, and the input end of the second low-temperature water supply area device is connected to the inner constant temperature box through a pipeline.
The axial direction of the freezing pipe is parallel to the axial direction of the soil body.
The soil body includes that paraffin layer, the parcel of ring form structure on the paraffin layer lateral wall of ring form structure freeze the clay layer, and corresponding respectively on the inner wall of paraffin layer, the outer wall installs first thermocouple temperature measurement end, second thermocouple temperature measurement end, corresponding respectively on inner wall of freezing clay layer, the outer wall installs third thermocouple temperature measurement end, fourth thermocouple temperature measurement end.
A testing method of a testing device for a thermal conductivity coefficient of semi-infinite space frozen clay comprises the following steps:
the first step is as follows: starting two circulating cold baths, namely a first low-temperature water supply area device and a second low-temperature water supply area device, and respectively setting the temperature of the cold spraying circulating liquid to be-10 ℃ and-25 ℃;
the second step is that: running the cooling bath circulating liquid for 8 hours after the cooling bath circulating liquid reaches the required temperature, starting temperature measurement, measuring the temperature of the two side wall surfaces of the standard sample and the frozen soil sample once every 10 minutes, and recording; when the difference benefit measured by the temperature of each point for three times is 0.1 ℃, the test is finished;
the third step: calculating and calculating the heat conductivity coefficient of the frozen clay by adopting the following formula:
in the formula, lambda is the coefficient of heat conductivity of the frozen clay;
λ0is the thermal conductivity of paraffin;
delta theta is the temperature difference between two wall surfaces of the frozen clay layer;
Δθ0the temperature difference between two wall surfaces of the paraffin layer.
The utility model has the advantages that: the utility model has the advantages of reasonable design, adopt annular structural design to simulate traditional unlimited plane, realize having compensatied the vacancy of prior art to clay coefficient of heat conductivity's test.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of the connection of the inner thermostat, the soil body, the freezing pipe and the outer thermostat of the utility model;
fig. 3 is an enlarged view of part I of fig. 2.
Detailed Description
In order to make the utility model realize, the technical means, the creation characteristics, the achievement purpose and the efficacy are easy to understand and understand, and the utility model is further explained below.
As shown in fig. 1 to 3, a testing device for testing the heat conductivity of semi-infinite space frozen clay comprises a first low-temperature water supply area device, a second low-temperature water supply area device, an inner constant temperature box 1, a soil body 2 and an outer constant temperature box 4, wherein the inner constant temperature box 1, the soil body 2 and the outer constant temperature box 4 are all in a circular cylindrical structure, the inner side wall of the soil body 2 is attached to the outer side wall of the inner constant temperature box 1, and the outer side wall of the soil body 2 is attached to the inner side wall of the outer constant temperature box 4; freezing pipes 3 are inserted into the soil body 2 at equal intervals along the circumferential direction, the first low-temperature water supply area device is communicated with the outer constant temperature box 4, and the second low-temperature water supply area device is communicated with the inner constant temperature box 1. The utility model discloses a first low temperature water supply waters device, second low temperature water supply waters device, but the outer thermostated container of independent control 4, the work of interior thermostated container 1 to form specific operating temperature.
The first low-temperature water supply area device and the second low-temperature water supply area device have the same structure and respectively comprise a low-temperature cold water area 11, a heating pipe 12, an electromagnetic valve 13, a condenser 14, a compressor 15 and a water pump 16, wherein the heating pipe 12 is arranged in the low-temperature cold water area 11, the output end of the compressor 15 is connected in series with the condenser 14 and the electromagnetic valve 13 sequentially through a pipeline and is connected into the low-temperature cold water area 11, and then is connected into the input end of the compressor 15 from the low-temperature cold water area 11 through the pipeline; the output end of the low-temperature cold water area 11 of the first low-temperature water supply area device is connected with the water pump 16 in series through a pipeline and then is connected to the outer constant temperature box 4, and the input end of the low-temperature cold water area 11 of the first low-temperature water supply area device is connected to the outer constant temperature box 4 through a pipeline; the output end of the low-temperature cold water area 11 of the second low-temperature water supply area device is connected with the water pump 16 in series through a pipeline and then is connected to the inner constant temperature box 1, and the input end of the second low-temperature water supply area device is connected to the inner constant temperature box 1 through a pipeline.
The axial direction of the freezing pipe 3 is parallel to the axial direction of the soil body 2.
A testing method of a testing device for a thermal conductivity coefficient of semi-infinite space frozen clay comprises the following steps:
the first step is as follows: starting two circulating cold baths, namely a first low-temperature water supply area device and a second low-temperature water supply area device, and respectively setting the temperature of the cold spraying circulating liquid to be-10 ℃ and-25 ℃;
the second step is that: running the cooling bath circulating liquid for 8 hours after the cooling bath circulating liquid reaches the required temperature, starting temperature measurement, measuring the temperature of the two side wall surfaces of the standard sample and the frozen soil sample once every 10 minutes, and recording; when the difference benefit measured by the temperature of each point for three times is 0.1 ℃, the test is finished;
the third step: calculating and calculating the heat conductivity coefficient of the frozen clay by adopting the following formula:
in the formula, lambda is the coefficient of heat conductivity of the frozen clay;
λ0is the thermal conductivity of paraffin;
delta theta is the temperature difference between the two wall surfaces of the frozen clay layer 6;
Δθ0the temperature difference between the two walls of the paraffin layer 5.
Additionally, the utility model discloses the controllable 3 simulation ambient temperature that freeze the pipe changes to be applicable to the test of coefficient of heat conductivity under the different ambient temperature.
According to the testing device and following the testing method, the heat conductivity coefficient of the semi-infinite space frozen clay can be tested.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and what is described in the specification are the principles of the present invention, and that there can be various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. The utility model provides a semi-infinite space freezes clay coefficient of heat conductivity testing arrangement, includes first low temperature water supply waters device, second low temperature water supply waters device, interior thermostated container (1), soil body (2), outer thermostated container (4), its characterized in that: the inner constant temperature box (1), the soil body (2) and the outer constant temperature box (4) are all of circular cylindrical structures, the inner side wall of the soil body (2) is attached to the outer side wall of the inner constant temperature box (1), and the outer side wall of the soil body (2) is attached to the inner side wall of the outer constant temperature box (4); freezing pipes (3) are arranged in the soil body (2) at equal intervals along the circumferential direction in an inserted mode, the first low-temperature water supply area device is communicated with the outer constant temperature box (4), and the second low-temperature water supply area device is communicated with the inner constant temperature box (1).
2. The device for testing the coefficient of thermal conductivity of semi-infinite space frozen clay according to claim 1, wherein: the first low-temperature water supply area device and the second low-temperature water supply area device are identical in structure and respectively comprise a low-temperature cold water area (11), a heating pipe (12), an electromagnetic valve (13), a condenser (14), a compressor (15) and a water pump (16), wherein the heating pipe (12) is installed in the low-temperature cold water area (11), the output end of the compressor (15) is connected with the condenser (14) and the electromagnetic valve (13) in series in sequence through a pipeline and is connected into the low-temperature cold water area (11), and then the output end of the compressor (15) is connected into the input end of the compressor (15) from the low-temperature cold; the output end of the low-temperature cold water area (11) of the first low-temperature water supply area device is connected with the water pump (16) in series through a pipeline and then is connected onto the outer constant temperature box (4), and the input end of the low-temperature cold water area (11) of the first low-temperature water supply area device is connected onto the outer constant temperature box (4) through a pipeline; the output end of a low-temperature cold water area (11) of the second low-temperature water supply area device is connected with a water pump (16) in series through a pipeline and then is connected to the inner constant temperature box (1), and the input end of the second low-temperature water supply area device is connected to the inner constant temperature box (1) through a pipeline.
3. The device for testing the coefficient of thermal conductivity of semi-infinite space frozen clay according to claim 1, wherein: the axial direction of the freezing pipe (3) is parallel to the axial direction of the soil body (2).
4. The device for testing the coefficient of thermal conductivity of semi-infinite space frozen clay according to claim 1, wherein: soil body (2) including paraffin layer (5), the freezing clay layer (6) of the ring form structure of parcel on paraffin layer (5) lateral wall of ring form structure, correspond respectively on the inner wall of paraffin layer (5), the outer wall and install first electric heat couple temperature measurement end (7), second electric heat couple temperature measurement end (8), correspond respectively on inner wall, the outer wall of freezing clay layer (6) and install third electric heat couple temperature measurement end (9), fourth electric heat couple temperature measurement end (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020214630.XU CN211741137U (en) | 2020-02-26 | 2020-02-26 | Testing device for heat conductivity coefficient of semi-infinite space frozen clay |
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| CN202020214630.XU CN211741137U (en) | 2020-02-26 | 2020-02-26 | Testing device for heat conductivity coefficient of semi-infinite space frozen clay |
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| CN211741137U true CN211741137U (en) | 2020-10-23 |
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| CN202020214630.XU Active CN211741137U (en) | 2020-02-26 | 2020-02-26 | Testing device for heat conductivity coefficient of semi-infinite space frozen clay |
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