CN105044149B - A kind of method of heat-insulating material thermal conductivity factor under the conditions of measurement different water cut - Google Patents
A kind of method of heat-insulating material thermal conductivity factor under the conditions of measurement different water cut Download PDFInfo
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- CN105044149B CN105044149B CN201510466290.3A CN201510466290A CN105044149B CN 105044149 B CN105044149 B CN 105044149B CN 201510466290 A CN201510466290 A CN 201510466290A CN 105044149 B CN105044149 B CN 105044149B
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Abstract
The invention discloses a kind of method of heat-insulating material thermal conductivity factor under the conditions of measurement different water cut, comprise the following steps：Two samples are taken to be dried to over dry to same sample, one of as calibration sample, another is used as and treats test sample；It will treat that test sample does water suction processing, to required moisture content w；Under conditions of mean temperature is T, the thermal conductivity factor of calibration sample is measured with steady state method, and test result is designated as λ 2；Under conditions of mean temperature is T, cold store enclosure is calibrated with calibration sample and test result λ 2；Mean temperature be T under conditions of, with after calibration cold store enclosure test water suction after treat test sample, produce when test sample moisture content be w, mean temperature be T when thermal conductivity factor λ (w, T), complete measurement.The present invention is the method for heat-insulating material thermal conductivity factor under the conditions of measurement different water cut, can be good at limiting moisture migration in the sample and distributing outwardly, ensures the uniformity of sample inner aqueous during measurement, have the advantages that method of testing is simple, accuracy is high.
Description
Technical field
The present invention relates to a kind of method of heat-insulating material thermal conductivity factor under the conditions of measurement different water cut.
Background technology
The heat conductivility of heat-insulating material is one of key parameter for determining that its product is good and bad, therefore during quality testing
Will be extremely important for the Accurate Determining of material thermal conductivity.In the concerned countries standard of existing heat-insulating material Measured Results of Thermal Conductivity
In, such as GB/T 10294, GB/T 10295, influence of the temperature factor for material thermal conductivity is concerned only with, and ignore material and contain
Influence of the water rate to thermal conductivity factor.But in actual use, heat-insulating material is by weather, construction etc. be natural or the shadow of non-natural factor
Ring, its own can contain a certain amount of moisture, and contained humidity number which kind of of thermal conductivity of material can be caused to change, at present
Unified calibration method there is no accurately to be weighed.Therefore, it is necessary to a kind of suitable method of testing is established, for assessing difference
The size of heat-insulating material thermal conductivity factor under aqueous conditions.
The content of the invention
The method that the present invention provides heat-insulating material thermal conductivity factor under the conditions of a kind of measurement different water cut, can accurate measurement material
Thermal conductivity factor under different water cut, it is simple to operate, accuracy is high.
In order to solve the above technical problems, the technical solution adopted in the present invention is as follows：
The method of heat-insulating material thermal conductivity factor, comprises the following steps under the conditions of a kind of measurement different water cut：
1) two samples are taken to be dried to over dry to same sample, wherein one treats test sample as calibration sample, another be used as；
2) it will treat that test sample does water suction processing, to required moisture content w；
3) under conditions of mean temperature is T, the thermal conductivity factor of calibration sample is measured with steady state method, and test result is designated as
λ2；
4) under conditions of mean temperature is T, the laboratory apparatus of cold store enclosure is calibrated with calibration sample and test result λ 2；
5) under conditions of mean temperature is T, test sample is treated with after the cold store enclosure laboratory apparatus test water suction after calibration,
Produce when test sample moisture content be w, mean temperature be T when thermal conductivity factor λ (w, T), complete measurement.
Applicant it has been investigated that, with steady state method heat conducting coefficient measuring, take it is long, if to the material containing certain moisture
Material test, then water translocation be present and distributes, so as to influence the accuracy of measurement, therefore, steady state method is suitable to over dry material
The accurate measurement of thermal conductivity factor；And cold store enclosure, although test speed is fast, accuracy is relatively low；Applicant uses through research
Steady state method calibrates cold store enclosure, so as to accurately measure using the cold store enclosure after calibration the heat conduction of material under certain moisture content
Coefficient, it can be good at limiting moisture migration in the sample and distributing outwardly, ensure sample inner aqueous during measurement
Uniformity, improve the accuracy of measurement and simple to operate.
Above-mentioned steps 1) in the quantity of sampling quantity of two samples determine as the case may be, in order to further improve accuracy, often
Kind is desirable multiple, then averages.
In order to further improve the accuracy of measurement, in step 1), two samples are taken to be of the same size.
In order to facilitate measurement, while ensure the accuracy of measurement, in step 1), take the plate that two samples are surfacing
Shape.
In order to further improve the accuracy of measurement, prevent sample from absorbing or distributing moisture, it is preferable that in step 2), will to inhale
Treat that test sample moisture-inhibiting resistance is at least 200MNs/g diaphragm seal after water process, and placement makes to treat the uniform moisture point in test sample
Cloth；Further preferably, in step 2), treat that test sample is at least the thin of 200MNs/g with more than two layers moisture-inhibiting resistance after water suction is handled
Film seals, but the gross thickness of film used must not exceed and treat the 1/100 of test sample original thickness, and places more than 96h, every during placement
Sample will be stood every 22-26h and overturns 180 °, make to treat the uniform moisture distribution in test sample.
The above-mentioned original thickness for treating test sample refers to the thickness before being dried to over dry.
In order to further improve the accuracy of measurement, it is preferable that in step 1), by the calibration sample for being dried to over dry with moisture-inhibiting hinder to
It is 200MNs/g diaphragm seal less.Further preferably, in step 1), the calibration sample for being dried to over dry is hindered with more than two layers moisture-inhibiting
At least 200MNs/g diaphragm seal, but the gross thickness of film used must not exceed the 1/100 of calibration sample original thickness.
The original thickness of above-mentioned calibration sample refers to the thickness before being dried to over dry.
The selection of film meets that moisture-inhibiting resistance is at least 200MNs/g, but in order to ensure the sealing effectiveness to sample, from
And improve the accuracy of measurement, it is preferable that film is the polyethylene film that thickness is not less than 0.1mm.
In order to further improve the accuracy of measurement, it is preferable that in step 4), calibration method is：According to measurement of instability value
Comparison between steady state measurement value λ 2 adjusts calibration factor, until measurement of instability method measures calibration sample continuous more than 3 times
Thermal conductivity factor deviation be no more than 0.001W/ (mK), you can it is qualified to think to verify.
In order to facilitate measurement, while ensure the accuracy of measurement, in step 3), steady state method is with reference to GB/T 10294 or GB/
Method in T10295；In step 4), cold store enclosure is heat-pole method (with reference to GB/T 10297) or plane heat source method (with reference to GB/T
10297、ISO 22007-2)。
Further preferably, it is a kind of measure different water cut under the conditions of heat-insulating material thermal conductivity factor method, comprise the following steps：
1) to same sample, two samples with identical size is taken, are respectively designated as sample 1 and sample 2, are marked in correlation
Over dry is dried at temperature as defined in standard, is weighed immediately, the quality for now weighing sample 1 and sample 2 is respectively m1And m2；
2) sample 1 is put into the container for filling water using full leaching mode, carries out water suction processing, during which the sample can be entered
Row periodically or non-periodically weighs, rapid to take out after the aqueous conditions needed for experiment are reached, quick with blotting paper within 1min
Surface water droplet is dipped in, weighs the mass m of sample 1 now immediately1 *, obtain the wet basis moisture content of sample 1：
The film for uniformly wrapping up two layers of moisture-inhibiting resistance at least 200MNs/g on the surface of sample 1 immediately is sealed, and is being tested
More than 96h is placed in room environmental, during which will stand sample every 24h overturns 180 °, to ensure that moisture is uniform inside sample
Distribution；
3) for the sample 2 after drying, equally by its surface, uniformly two layers of moisture-inhibiting of parcel resistance is at least the thin of 200MNs/g
Film is sealed, according to the method in GB/T 10294 or GB/T 10295, under conditions of mean temperature is T, to over dry shape
The sample thermal conductivity factor of state is measured, and test result is designated as into λ2；
4) by the thermal conductivity factor λ of sample 22As standard value, cold store enclosure pair is used in the thermostatic chamber (case) that temperature is T
The thermal conductivity factor of sample 2 measures, and during which adjusts calibration factor according to the comparison between measured value and standard value, until even
Continue 5 thermal conductivity factor deviations for measuring sample 2 and be no more than 0.001W/ (mK), you can think that instrument verification is qualified；
5) after the completion of the verification of cold store enclosure instrument, rapidly by the sample 1 obtained by step 2), the constant temperature in temperature for T
Thermal conductivity measurement is carried out using cold store enclosure in room (case), you can obtain sample 1 moisture content be w, mean temperature be T when
Thermal conductivity factor λ (w, T), so far test are completed.
Above-mentioned steps 3) -5) in when testing, the film at sample and instrument probe localized contact point need to be removed, to protect just
Sample fully contacts with probe.
The NM technology of the present invention is with reference to prior art.
The present invention measurement different water cut under the conditions of heat-insulating material thermal conductivity factor method compensate for conventional method measurement not
With the deficiency under aqueous conditions during heat-insulating material thermal conductivity factor, it can be good at limiting moisture migration in the sample and outwardly
Distribute, ensure measurement when sample inner aqueous uniformity, have the advantages that method of testing is simple, accuracy is high, Ke Yicheng
For the new method of heat-insulating material Measured Results of Thermal Conductivity under the conditions of different water cut.
Embodiment
For a better understanding of the present invention, with reference to the embodiment content that the present invention is furture elucidated, but the present invention
Content is not limited solely to the following examples.
Embodiment 1
The measurement of aqueous rock cotton board thermal conductivity factor, including following steps connected in order：
(1) first, to a rock wool slab products, two 300 ± 2mm of block length, 300 ± 2mm of width are taken, thickness is that sample is former thick
Surfacing plate tensile sample, be respectively designated as sample 1 and sample 2, dried in 105 DEG C of baking oven to claiming immediately after constant weight
Amount, the sample 1 and the quality of sample 2 now weighed is respectively m1=695.58g and m2=698.15g.
(2) sample 1 is put into the container for filling certain water using full leaching mode, carries out water suction processing, during which per 24h
Weighing sample mass, it is rapid to take out after the aqueous conditions needed for experiment are reached, remove table with blotting paper is quickly dipped soon within 1min
Face water droplet, the mass m of sample 1 now is weighed immediately1 *=1256.65g, obtain the wet basis moisture content of sample 1：
(3) two layers of polyethylene film (thickness in monolayer 0.1mm) is uniformly wrapped up on the surface of sample 1 immediately, in the reality of standard
Test (23 ± 1 DEG C of room air；50% ± 10%RH) in place 7d, during which every 24h will stand sample upset 180 °, to ensure water
Divide being uniformly distributed inside sample.
(4) for the sample 2 after drying, its surface is uniformly equally wrapped up into two layers of polyethylene film, and (thickness in monolayer is
0.1mm), using heat-flow meter method (with reference to GB/T 10295), under conditions of mean temperature is 25 DEG C, the rock of absolute dry condition is measured
Cotton sample thermal conductivity factor is λ2=0.038W/ (mK).
(5) by the thermal conductivity factor λ of sample 22As standard value, using heat-pole method (ginseng in the thermostatic chamber that temperature is 25 DEG C
According to GB/T 10297) thermal conductivity factor of sample 2 is measured, during which adjusted according to the comparison between measured value and standard value
Calibration factor, the continuous 5 times heat conduction for measuring sample 2 is 0.038W/ (mK), meets instrument and verifies qualified condition.
(6) after the completion of instrumental calibration, rapidly by sample 1, led in the thermostatic chamber that temperature is 25 DEG C using heat-pole method
The measurement of hot coefficient, obtain the sample and be 44.65% in moisture content, thermal conductivity factor λ when mean temperature is 25 DEG C (44.65%,
25)=0.199W/ (mK), test are completed.
When being tested in above steps, the film at sample and instrument probe localized contact point need to be removed, to protect positive examination
Sample fully contacts with probe.
To verify the accuracy of the inventive method, 3 rock wools to be measured with identical size are taken to try again from same sample
Sample, and they are cultivated to identical moisture content, parallel testing is carried out using above step (1)-(6), each sample tests 3
It is secondary, 9 experimental results altogether, be respectively：0.199W/(m·K)、0.201W/(m·K)、0.198W/(m·K)、0.202W/
(mK), 0.201W/ (mK), 0.197W/ (mK), 0.199W/ (mK), 0.199W/ (mK), 0.201W/ (mK),
Their relative standard deviation is less than 1%, it can be seen that result of the test has repeatability well, and this also illustrates present invention side
The accuracy of method.
Claims (9)
1. a kind of method of heat-insulating material thermal conductivity factor under the conditions of measurement different water cut, it is characterised in that：Comprise the following steps：
1) two samples are taken to be dried to over dry to same sample, wherein one treats test sample as calibration sample, another be used as；
2) it will treat that test sample does water suction processing, to required moisture content w；
3) under conditions of mean temperature is T, the thermal conductivity factor of calibration sample is measured with steady state method, and test result is designated as λ 2；
4) under conditions of mean temperature is T, the laboratory apparatus of cold store enclosure is calibrated with calibration sample and test result λ 2；
5) under conditions of mean temperature is T, test sample is treated with after the laboratory apparatus test water suction of the cold store enclosure after calibration, i.e.,
Must when test sample moisture content be w, mean temperature be T when thermal conductivity factor λ (w, T), complete measurement；
In step 4), calibration method is：Calibration system is adjusted according to the comparison between measurement of instability value and steady state measurement value λ 2
Number, until continuous more than 3 times thermal conductivity factor deviations for measuring calibration sample of measurement of instability method are no more than 0.001W/ (mK), i.e.,
It is believed that verification is qualified.
2. the method as described in claim 1, it is characterised in that：In step 1), two samples are taken to be of the same size.
3. method as claimed in claim 2, it is characterised in that：In step 1), the tabular that two samples are surfacing is taken.
4. the method as described in claim 1-3 any one, it is characterised in that：It is to be measured after water suction is handled in step 2)
Sample is at least 200MNs/g diaphragm seal with moisture-inhibiting resistance, and placement makes to treat that the internal moisture of test sample is uniformly distributed.
5. method as claimed in claim 4, it is characterised in that：In step 2), after water suction is handled treat test sample with two layers with
Upper moisture-inhibiting resistance is at least 200MNs/g diaphragm seal, but the gross thickness of film used must not exceed and treat the 1/ of test sample original thickness
100, and more than 96h is placed, will stand sample every 22-26h during placement overturns 180 °, makes to treat that the internal moisture of test sample is uniform
Distribution.
6. method as claimed in claim 4, it is characterised in that：In step 1), by the calibration sample for being dried to over dry with moisture-inhibiting hinder to
It is 200MNs/g diaphragm seal less.
7. method as claimed in claim 6, it is characterised in that：In step 1), the calibration sample of over dry will be dried to more than two layers
Moisture-inhibiting resistance is at least 200MNs/g diaphragm seal, but the gross thickness of film used must not exceed the 1/100 of calibration sample original thickness.
8. method as claimed in claim 6, it is characterised in that：Film is the polyethylene film that thickness is not less than 0.1mm.
9. the method as described in claim 1-3 any one, it is characterised in that：In step 3), steady state method is with reference to GB/T10294
Or the method in GB/T 10295；In step 4), cold store enclosure is heat-pole method or plane heat source method.
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| CN110361416B (en) * | 2019-05-31 | 2022-02-18 | 惠州学院 | Method for measuring heat conductivity coefficient of moisture-absorption fiber fabric material in moisture-absorption state |
| CN113176294A (en) * | 2021-04-27 | 2021-07-27 | 内蒙合成化工研究所 | Calibration method of heat conductivity coefficient tester by protective heat flow meter method |
| CN114675013A (en) * | 2022-04-02 | 2022-06-28 | 中国林业科学研究院木材工业研究所 | Method and equipment for determining wood drying shrinkage/wet swelling behavior |
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|---|---|---|---|---|
| US6257761B1 (en) * | 1997-12-30 | 2001-07-10 | National Science Council | Insulation measuring apparatus which forces heat flow in one direction with a constant temperature region |
| US8220989B1 (en) * | 2009-09-30 | 2012-07-17 | The United States Of America As Represented By The Administrator Of National Aeronautics And Space Administration | Method and apparatus for measuring thermal conductivity of small, highly insulating specimens |
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| JP3385078B2 (en) * | 1993-11-15 | 2003-03-10 | 日本たばこ産業株式会社 | How to detect microorganisms |
| JP5489789B2 (en) * | 2010-03-05 | 2014-05-14 | 国立大学法人東京工業大学 | Sample temperature measuring apparatus and sample temperature measuring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6257761B1 (en) * | 1997-12-30 | 2001-07-10 | National Science Council | Insulation measuring apparatus which forces heat flow in one direction with a constant temperature region |
| US8220989B1 (en) * | 2009-09-30 | 2012-07-17 | The United States Of America As Represented By The Administrator Of National Aeronautics And Space Administration | Method and apparatus for measuring thermal conductivity of small, highly insulating specimens |
Non-Patent Citations (1)
| Title |
|---|
| 建筑节能岩棉板（岩棉条）性能的研究;路永华等;《2012第五届（中国）国际建筑干混砂浆生产应用技术研讨会论文集》;20121231;全文 * |
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