CN209589899U - A kind of measuring device of pipe surface heat transfer coefficient - Google Patents
A kind of measuring device of pipe surface heat transfer coefficient Download PDFInfo
- Publication number
- CN209589899U CN209589899U CN201920044144.5U CN201920044144U CN209589899U CN 209589899 U CN209589899 U CN 209589899U CN 201920044144 U CN201920044144 U CN 201920044144U CN 209589899 U CN209589899 U CN 209589899U
- Authority
- CN
- China
- Prior art keywords
- temperature
- pipeline
- heat
- heat transfer
- emitting board
- 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.)
- Expired - Fee Related
Links
Landscapes
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The utility model discloses a kind of measuring devices of pipe surface heat transfer coefficient, including pipeline experimental circuit device and temperature sensor, pipeline experimental circuit device includes AC power source, slide rheostat, ammeter, voltmeter and electric heat-emitting board, heat insulation layer is equipped with outside electric heat-emitting board, electric heat-emitting board includes lateral surface and medial surface, lateral surface connects temperature sensor with medial surface, slide rheostat adjusts circuitous resistance, keep electric heat-emitting board lateral surface temperature close with tested pipeline surface temperature, ammeter and voltmeter measurement and display circuit current value and voltage value；The measuring device of the utility model is not directly contacted with pipe surface, is not influenced pipeline normal work, can be placed on pipeline any direction, any angle measures pipe surface heat transfer coefficient, it is convenient and efficient not against empirical equation exploitation without setting closed environment.
Description
Technical field
The utility model belongs to pipe surface field of measuring technique, and in particular to a kind of measurement of pipe surface heat transfer coefficient
Device.
Background technique
In oil and gas industry, more and more industrial pipelines need to carry out insulation, as jet chimney and LNG are managed
Road requires to be insulated.The case where will appear insulation effect decline in heat-insulating material breakage or long-term use process, influencing pipeline just
Often operation, causes a serious accident when serious.Pipeline leaking heat is the important evidence for determining pipe insulation effect quality, pipeline leakage heat
Amount mainly includes convective heat transfer and radiant heat transfer two parts, and the heat transfer coefficient of different heat transfer mode has corresponding experience public
Formula, is directed to different insulated pipings at present, different installation directions (horizontal, vertical, inclination), and varying environment situation all can be to spreading
Hot coefficient and radiation heat transfer coefficient calculating bring error, while the installation direction of pipeline is different, and convective heat-transfer coefficient and radiation pass
The calculation formula of hot coefficient is different from.Therefore, empirical equation, which calculates, has inaccuracy, in empirical equation comprising a part according to
According to the parameter that experience is chosen, such as air Prandtl number, air movement viscosity, and empirical equation does not consider pipeline comprehensively
The problem of installation direction, this all cannot ensure the accuracy that pipe surface overall heat-transfer coefficient calculates.
Summary of the invention
The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of measurement of pipe surface heat transfer coefficient
Device designs a kind of measuring device of contactless pipe surface heat transfer coefficient, can quickly, accurately obtain pipe surface heat transfer
Coefficient, and then determine the leaking heat of pipeline, judge pipe insulation effect, take measures on customs clearance in time, guarantees pipe safety operation.
Purpose of the utility model is realized as follows: a kind of measuring device of pipe surface heat transfer coefficient, including pipeline
Experimental circuit device and temperature sensor, the pipeline experimental circuit device include the AC power source being successively linked in sequence, sliding
Rheostat, ammeter, voltmeter and electric heat-emitting board, the outside of the electric heat-emitting board are provided with heat insulation layer, and electric heat-emitting board includes setting
In the lateral surface in atmospheric environment and the medial surface wrapped up by heat insulation layer, temperature sensing is connected on the lateral surface and medial surface
Device, for measuring and showing the temperature of lateral surface and medial surface, the slide rheostat makes the electricity for adjusting circuitous resistance
The temperature of heating board lateral surface is close with tested pipeline surface temperature, and the ammeter and voltmeter are respectively used in the sliding
Rheostat adjusted every time the electric heat-emitting board lateral surface temperature it is close with tested pipeline surface temperature when, measure and show electricity
The current value and voltage value on road.
Further, the electric heat-emitting board is the metal plate for being fixed with heating resistance wire, and the metal plate material is dumb light
Stainless steel.
Further, the insulation layer material is that thermal coefficient is lower than 0.05W/m2Material.
Further, the temperature sensor is thermojunction type sensor or thermal resistance type sensor.
By adopting the above-described technical solution, the utility model has the following beneficial effects:
1, measuring device and pipe surface are not directly contacted with, using a kind of contactless pipe surface heat transfer coefficient
Measuring device, do not influence pipeline normal work, measuring device is small and exquisite, easy to carry, easy to operate.
2, measuring device can be placed on pipeline any direction, and any angle measures pipe surface heat transfer coefficient, it is ensured that right
The accuracy of heat transfer coefficient is flowed, and then calculates leaking heat, pipe insulation effect is judged, takes measures on customs clearance in time, guarantees pipeline
Safe operation.
3, measuring device energy Accurate Determining goes out pipeline surface coefficient of heat transfer under current environment, without setting closed environment,
It can measure under any environment, it is convenient not against empirical equation exploitation including outdoor and interior conduit surface coefficient of heat transfer
Fast.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model measuring device；
Fig. 2 is the position view that pipe surface is placed in when the measurement of the utility model measuring device；
Appended drawing reference
In attached drawing, 1 is AC power source, and 2 be slide rheostat, and 3 be ammeter, and 4 be voltmeter,
5 be electric heat-emitting board, and 6 be temperature sensor, and 7 be heat insulation layer, and 8 be pipeline,
9 be lateral surface temperature, and 10 be medial surface temperature, and 51 be heating resistance wire, and 52 be metal plate
Specific embodiment
The embodiments of the present invention are described in further detail with reference to the accompanying drawing, in Fig. 1, Fig. 2 shown in arrow
Direction is atmospheric environment.
Referring to Fig. 1, a kind of measuring device of pipe surface heat transfer coefficient, including pipeline experimental circuit device and temperature sensing
Device 6, the pipeline experimental circuit device include the AC power source 1 being successively linked in sequence, slide rheostat 2, ammeter 3, voltage
Table 4 and electric heat-emitting board 5, the outside of the electric heat-emitting board 5 are provided with heat insulation layer 7, and electric heat-emitting board 5 includes being placed in atmospheric environment
Lateral surface and the medial surface wrapped up by heat insulation layer 7 connect temperature sensor 6 on the lateral surface and medial surface, for measuring simultaneously
Show lateral surface and medial surface temperature 9,10, the slide rheostat 2 makes outside the electric heat-emitting board 5 for adjusting circuitous resistance
Side temperature 9 is close with 8 surface temperature of tested pipeline, and the ammeter 3 and voltmeter 4 are respectively used in the slide rheostat
2 adjusted every time 5 lateral surface of electric heat-emitting board temperature it is close with 8 surface temperature of tested pipeline when, measure and display circuit
Current value and voltage value.
In the present embodiment, the electric heat-emitting board 5 is the metal plate 52 for being fixed with heating resistance wire 51, the metal plate 52
Using brush finished stainless steel material, heating resistance wire uses not oxidizable material, such as constantan, nickel chromium triangle.Pass through slide rheostat
Circuitous resistance is adjusted, powering on makes heating resistance wire 51 generate heat, and 52 temperature of metal plate increases, until metal plate lateral surface temperature
9 is close with tested pipeline surface temperature.
In the present embodiment, the heat insulation layer 7 is lower than 0.05W/m using thermal coefficient2Material, AC power source is common
220V/380V power supply.
In the present embodiment, the temperature sensor is thermojunction type sensor, can also use thermal resistance type sensor.
The method that pipe surface heat transfer coefficient is measured using the measuring device of the utility model, including following step
It is rapid:
S1, measuring device is used to read pipe surface temperature first, measuring device can be surveyed using thermometer or infrared ray
Wen Yi；
S2, power on, adjust the slide rheostat of pipeline experimental circuit device, so that heating resistance wire is heated up, pass through sight
The reading for surveying metal plate lateral surface temperature sensor, makes lateral surface temperature and pipe surface temperature close；
S3, according to arrangement shown in Fig. 2, metal plate lateral surface is parallel to duct survey surface and is placed, measurement gold
The surface coefficient of heat transfer for belonging to plate starts to acquire when the pipe surface temperature measured in metal plate lateral surface temperature and S1 is identical
Metal plate inside, temperature outside sensor reading and ammeter, voltmeter reading；
S4, change orientation and continue measurement three times, the voltage value that is then obtained according to measurement, current value, metal plate medial surface,
The temperature difference of lateral surface calculates the heat transfer system for respectively obtaining four positions of metal sheet surface in conjunction with the area of the metal plate
Number K1, K2, K3, K4, take the average value of four values, obtain metal sheet surface Coefficient K, i.e. pipe surface heat transfer coefficient, be
The accuracy for guaranteeing result, can repeatedly measure metal sheet surface heat transfer coefficient according to tested pipeline installation site point different direction
Averaged.
In the present embodiment, the Coefficient K in S4 is calculated using following formula:
Wherein: U is voltage, and I is electric current, and A is metal plate area,
△ T-metal plate inside, temperature outside are poor
Due to measuring device and tested pipeline under same environment and metal plate lateral surface temperature and tested pipeline surface temperature
It spends same or similar, can determine metal sheet surface heat transfer coefficient and tested pipeline surface coefficient of heat transfer that this measurement method measures
Unanimously.
The measuring device of the utility model is a kind of determination techniques of contactless pipe surface heat transfer coefficient, is not influenced
Pipeline works normally, and device is small and exquisite, easy to carry, easy to operate.Pipeline any direction, any angle measurement pipe can be placed on
Road surface coefficient of heat transfer, it is ensured that the accuracy of convective heat-transfer coefficient, and then leaking heat is calculated, judge pipe insulation effect, in time
It takes measures on customs clearance, guarantees pipe safety operation.Gone out under current environment by the measuring device and measurement method energy Accurate Determining
Pipe surface overall heat-transfer coefficient, it is convenient and efficient, the surface coefficient of heat transfer of pipeline under any environment can be measured, not against empirical equation
Exploitation.
Finally, it is stated that preferred embodiment above is merely intended for describing the technical solutions of the present application, but not for limiting the present application, to the greatest extent
Pipe has been described in detail the utility model by above preferred embodiment, but those skilled in the art should manage
Solution, can make various changes, without departing from the utility model claims book institute to it in the form and details
The range of restriction.
Claims (4)
1. a kind of measuring device of pipe surface heat transfer coefficient, including pipeline experimental circuit device and temperature sensor, feature
Be: the pipeline experimental circuit device includes the AC power source being successively linked in sequence, slide rheostat, ammeter, voltmeter
And electric heat-emitting board, the outside of the electric heat-emitting board are provided with heat insulation layer, electric heat-emitting board includes the lateral surface being placed in atmospheric environment
With the medial surface wrapped up by heat insulation layer, temperature sensor is connected on the lateral surface and medial surface, for measuring and showing outside
The temperature in face and medial surface, the slide rheostat for adjusting circuitous resistance, make the temperature of the electric heat-emitting board lateral surface with
Tested pipeline surface temperature is close, and the ammeter and voltmeter are respectively used to adjust every time in the slide rheostat described
When the temperature of electric heat-emitting board lateral surface is close with tested pipeline surface temperature, the current value and voltage value of simultaneously display circuit are measured.
2. a kind of measuring device of pipe surface heat transfer coefficient according to claim 1, it is characterised in that: the electricity fever
Plate is the metal plate for being fixed with heating resistance wire, and the metal plate material is brush finished stainless steel.
3. a kind of measuring device of pipe surface heat transfer coefficient according to claim 2, it is characterised in that: the heat insulation layer
Material is that thermal coefficient is lower than 0.05W/m2Material.
4. a kind of measuring device of pipe surface heat transfer coefficient according to claim 2, it is characterised in that: the temperature passes
Sensor is thermojunction type sensor or thermal resistance type sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920044144.5U CN209589899U (en) | 2019-01-11 | 2019-01-11 | A kind of measuring device of pipe surface heat transfer coefficient |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920044144.5U CN209589899U (en) | 2019-01-11 | 2019-01-11 | A kind of measuring device of pipe surface heat transfer coefficient |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209589899U true CN209589899U (en) | 2019-11-05 |
Family
ID=68353077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920044144.5U Expired - Fee Related CN209589899U (en) | 2019-01-11 | 2019-01-11 | A kind of measuring device of pipe surface heat transfer coefficient |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209589899U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632877A (en) * | 2019-01-11 | 2019-04-16 | 重庆科技学院 | A kind of measuring device and measuring method of pipe surface heat transfer coefficient |
-
2019
- 2019-01-11 CN CN201920044144.5U patent/CN209589899U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632877A (en) * | 2019-01-11 | 2019-04-16 | 重庆科技学院 | A kind of measuring device and measuring method of pipe surface heat transfer coefficient |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5067094A (en) | Quantifying isolation valve leakage | |
| Baughn et al. | A comparison of the transient and heated-coating methods for the measurement of local heat transfer coefficients on a pin fin | |
| CN103196949A (en) | Heat resistance heat flow meter calibration method and implementation device thereof | |
| CN102072916B (en) | Method and device for measuring total hemispherical emissivity of non-metallic material | |
| CN102954981A (en) | Device and method for testing performance of high-temperature pipeline heat insulation clad material | |
| CN108333215B (en) | A kind of analysis of thermal conductivity method of aerogel heat-proof layer in integral type T PS | |
| CN209589899U (en) | A kind of measuring device of pipe surface heat transfer coefficient | |
| CN108362734A (en) | A kind of test method and test device of the lower textile heat transfer property of thermal current impact | |
| CN109186815A (en) | A kind of low temperature High Mach number detecting probe temperature calibration device | |
| Zhou et al. | Validity evaluation on temperature correction methods by thermocouples with different bead diameters and application of corrected temperature | |
| CN206656979U (en) | It is a kind of to be used to measure rubber and the experimental provision of intermetallic contact thermal resistance | |
| CN205607902U (en) | Metal heat preservation plate thermal insulation performance detection device | |
| CN206756728U (en) | A kind of good conductor thermal conductivity factor experiment instrument | |
| CN204027490U (en) | A kind of experimental provision that carrys out slotted line expansion coefficient with clock gauge | |
| CN211014087U (en) | Simulation detection device for heat dissipation effect of low-thermal-resistance cable filling medium | |
| CN206594091U (en) | The measurement apparatus of thermal conductivity factor under a kind of asphalt different temperatures | |
| CN109632877A (en) | A kind of measuring device and measuring method of pipe surface heat transfer coefficient | |
| Jaremkiewicz et al. | Measuring transient temperature of the medium in power engineering machines and installations | |
| CN208125653U (en) | A kind of thermal current impacts the test device of lower textile heat transfer property | |
| Cortellessa et al. | A novel calibration system for heat flow meters: Experimental and numerical analysis | |
| CN108896606A (en) | A kind of unstable state cylinder heat resource method temperature becomes effective thermal conductivity measurement device and method | |
| CN208254646U (en) | A kind of on-line testing device of infrared radiation thermometer | |
| CN207571062U (en) | Adjustable material thermal resistance hot-fluid determination experiment device | |
| WO2015125277A1 (en) | Gas flow-rate measurement system, gas flow-rate measurement method, and gas flow-rate measurement program | |
| CN207423851U (en) | A kind of temperature equalization system and the heat-insulating property detecting system with the temperature equalization system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191105 Termination date: 20210111 |