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Position: Chinese Standard in English/GB/T 10294-2008
GB/T 10294-2008   Thermal insulation - Determination of steady-state thermal resistance and related properties - Guarded hot plate apparatus (English Version)
Standard No.: GB/T 10294-2008 Status:valid remind me the status change

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Language:English File Format:PDF
Word Count: 24000 words Price(USD):600.0 remind me the price change

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Implemented on:2009-4-1 Delivery: via email in 1 business day
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Standard No.: GB/T 10294-2008
English Name: Thermal insulation - Determination of steady-state thermal resistance and related properties - Guarded hot plate apparatus
Chinese Name: 绝热材料稳态热阻及有关特性的测定 防护热板法
Chinese Classification: Q25    Heat insulation, sound absorption, light fireproof material
Professional Classification: GB    National Standard
Issued by: AQSIQ, SAC
Issued on: 2008-06-30
Implemented on: 2009-4-1
Status: valid
Superseding:GB/T 10294-1988 Thermal insulation; Determination of steady-State thermal resistance and related properties-Guard hot plate apparatus
Language: English
File Format: PDF
Word Count: 24000 words
Price(USD): 600.0
Delivery: via email in 1 business day
0.1 Standard subdivision This standard is divided into three sections, representing the most comprehensive assemblage of information-required to use the guarded hot plate apparatus, i.e.: 1 General; 2 Apparatus and Error Evaluation; 3 Test Procedures. While the user of the method specified in this standard for test purposes may need to concentrate only on Clause 3, he must also be familiar with the other two sections in order to obtain accurate results. He must be particularly knowledgeable .about the general requirements. Clause 2 is directed towards the designer of the apparatus, but he also, in order to provide good apparatus, must be concerned with the other sections of this method. Thus, the method will serve its purpose well. 0.2 Heat transfer and measured properties A large proportion of thermal- testing is undertaken on light density porous materials. In such cases, the actual heat transfer within them can involve a complex combination of different contributions of radiation, conduction both in the solid and gas phase, and convection (in some operating conditions), plus their interactions together with mass transfer,- especially in moist materials. For such materials, the heat transfer property, very often wrongly called “thermal conductivity”; calculated from a defined formula and the results of measurements of heat flow-rate, temperature difference and dimensions, for a specimen may be not an intrinsic property of the material itself. This property, in accordance with ISO 9288, should therefore be called “transfer factor” as it may depend on the -test conditions (the transfer factor is often referred to elsewhere as apparent or effective thermal conductivity). Transfer factor may have a significant dependence on the thickness of the specimen and/or on the temperature difference for the same mean test temperature. Heat transfer by radiation is the first source of dependence of transfer factor on specimen thickness. As a consequence, not only material properties influence results, but also the radiative characteristics of the surfaces adjoining those of the specimen. Heat transfer by radiation also contributes to the dependence of transfer factor on temperature differences. This dependence can be experimentally detected for each type of material and for each mean test temperature when the temperature difference exceeds defined limits. Thermal resistance is therefore the property that better describes the thermal behaviour of the specimen, provided it is accompanied by information on the radiative characteristics of the adjoining surfaces. If there is the possibility of the onset of convection within the specimen (e.g. in light mineral wool for low temperatures), the apparatus orientation, the thickness and the temperature difference can influence both the transfer factor and the thermal resistance. In such cases, as a minimum it is required to fully specify the geometry and the boundary conditions of the specimen tested, even though information supplied in Clause 3 on test procedures does not cover these test conditions in detail. In addition, it will take considerable knowledge to evaluate the measurement, as such, especially when applying the measured values in practice. The influence of moisture within a specimen on the heat transfer during a measurement is also a very complex matter. Therefore, dried specimens only shall be tested according to standard procedures. Measurements on moist materials need additional precautions not covered in detail in this standard. The knowledge of the physical principles mentioned is also extremely important when a heat transfer property, determined by this test method, is used to predict the thermal behaviour of a specific material in a practical application even though other factors such as workmanship can influence this behaviour. 0.3 Background required The design and subsequent correct operation of a guarded hot plate to obtain correct results and the interpretation of experimental results is a complex subject requiring great care. It is recommended that the designer, operator and the user of measured data of the guarded hot plate should have a thorough background of knowledge of heat transfer mechanism in the materials, products and systems being evaluated, coupled with experience of electrical and temperature measurements, particularly at low signal levels. Good laboratory practice in accordance with general test procedures should also be maintained. The in-depth knowledge in each area mentioned may be different for the designer, operator and data user. 0.4 Design, size and national standards Many different designs’ of guarded hot plate apparatus exist worldwide which conform to present national standards. Continuing research and development is in progress to improve the apparatus and measurement techniques. Thus, it is not practical to mandate a specific design or size of apparatus, especially as total requirements may vary quite widely.  
Foreword II Introduction IV 1 General 1.1 Scope 1.2 Normative References 1.3 Terms and Definitions 1.4 Symbols and units (see Table 1) 1.5 Significance 1.6 Principle 1.7 Limitations due to apparatus 1.8 Limitations due to specimen 2 Apparatus and Error Evaluation 2.1 Apparatus description and design requirements 2.2 Evaluation of errors 2.3 Apparatus design 2.4 Performance check 3 Test Procedures 3.1 General 3.2 Test specimens 3.3 Test method 3.4 Procedures requiring multiple measurements 3.5 Calculations 3.6 Test report Annex A (Normative) Limit Values for Apparatus Performance and Testing Conditions Annex B (Informative) Thermocouples Annex C (Informative) Maximum Specimen Thickness Annex D (Informative) Bibliography Annex NA (Informative) Additional Remark
GB/T 10294-2008 is referred in:
* GB/T 19686-2005 Rock Wool, Slag Wool Thermal Insulating Products for Building
* GB/T 25998-2010 Mineral wool decorating and acoustic ceilings
* GB/T 17795-2008 Glass wool thermal insulating products for building
* GB/T 25998-2010 Mineral wool decorating and acoustic ceilings
* GB/T 17795-2008 Glass wool thermal insulating products for building
* GB/T 19686-2005 Rock Wool, Slag Wool Thermal Insulating Products for Building
* GB/T 19686-2005 Rock Wool, Slag Wool Thermal Insulating Products for Building
* GB/T 19686-2005 Rock Wool, Slag Wool Thermal Insulating Products for Building
* GB/T 13350-2008 Glass wool and their products for thermal insulation
* JC/T 1062-2007 Foamed concrete block
* GB 11968-2006 Autoclaved aerated concrete blocks
* JC 936-2004 One-component polyurethane foam
*GB/T 17794-2008 Preformed flexible elastomeric cellular thermal insulation
*GB/T 19686-2015 Rock wool thermal insulation products for building applications
*JC/T 412.1-2018 Fiber cement flat sheets-Part 1:Non-asbetos fiber cement flat sheets
*GB/T 13350-2017 Glass wool and its products for thermal insulation
*GB/T 8484-2020 Test method for thermal insulating performance for building exterior doors and windows
*GB/T 26978.4-2011 Design and manufacture of site built, vertical, cylindrical,flat-bottomed steel tanks for the storage of liquefied natural gases - Part 4: Insulation components
*GB/T 11835-2016 Rock wool,slag wool and its products for thermal insulation
*SY/T 7419-2018 Specification for insulation design, construction and acceptance of cryogenic piping
*GB/T 34336-2017 Reinforced nanoporous aerogel products for thermal insulation
*GB/T 35453-2017 Rigid polyurethane foam board for frozen soil subgrade(DLPU)
Code of China
Standard
GB/T 10294-2008  Thermal insulation - Determination of steady-state thermal resistance and related properties - Guarded hot plate apparatus (English Version)
Standard No.GB/T 10294-2008
Statusvalid
LanguageEnglish
File FormatPDF
Word Count24000 words
Price(USD)600.0
Implemented on2009-4-1
Deliveryvia email in 1 business day
Detail of GB/T 10294-2008
Standard No.
GB/T 10294-2008
English Name
Thermal insulation - Determination of steady-state thermal resistance and related properties - Guarded hot plate apparatus
Chinese Name
绝热材料稳态热阻及有关特性的测定 防护热板法
Chinese Classification
Q25
Professional Classification
GB
ICS Classification
Issued by
AQSIQ, SAC
Issued on
2008-06-30
Implemented on
2009-4-1
Status
valid
Superseded by
Superseded on
Abolished on
Superseding
GB/T 10294-1988 Thermal insulation; Determination of steady-State thermal resistance and related properties-Guard hot plate apparatus
Language
English
File Format
PDF
Word Count
24000 words
Price(USD)
600.0
Keywords
GB/T 10294-2008, GB 10294-2008, GBT 10294-2008, GB/T10294-2008, GB/T 10294, GB/T10294, GB10294-2008, GB 10294, GB10294, GBT10294-2008, GBT 10294, GBT10294
Introduction of GB/T 10294-2008
0.1 Standard subdivision This standard is divided into three sections, representing the most comprehensive assemblage of information-required to use the guarded hot plate apparatus, i.e.: 1 General; 2 Apparatus and Error Evaluation; 3 Test Procedures. While the user of the method specified in this standard for test purposes may need to concentrate only on Clause 3, he must also be familiar with the other two sections in order to obtain accurate results. He must be particularly knowledgeable .about the general requirements. Clause 2 is directed towards the designer of the apparatus, but he also, in order to provide good apparatus, must be concerned with the other sections of this method. Thus, the method will serve its purpose well. 0.2 Heat transfer and measured properties A large proportion of thermal- testing is undertaken on light density porous materials. In such cases, the actual heat transfer within them can involve a complex combination of different contributions of radiation, conduction both in the solid and gas phase, and convection (in some operating conditions), plus their interactions together with mass transfer,- especially in moist materials. For such materials, the heat transfer property, very often wrongly called “thermal conductivity”; calculated from a defined formula and the results of measurements of heat flow-rate, temperature difference and dimensions, for a specimen may be not an intrinsic property of the material itself. This property, in accordance with ISO 9288, should therefore be called “transfer factor” as it may depend on the -test conditions (the transfer factor is often referred to elsewhere as apparent or effective thermal conductivity). Transfer factor may have a significant dependence on the thickness of the specimen and/or on the temperature difference for the same mean test temperature. Heat transfer by radiation is the first source of dependence of transfer factor on specimen thickness. As a consequence, not only material properties influence results, but also the radiative characteristics of the surfaces adjoining those of the specimen. Heat transfer by radiation also contributes to the dependence of transfer factor on temperature differences. This dependence can be experimentally detected for each type of material and for each mean test temperature when the temperature difference exceeds defined limits. Thermal resistance is therefore the property that better describes the thermal behaviour of the specimen, provided it is accompanied by information on the radiative characteristics of the adjoining surfaces. If there is the possibility of the onset of convection within the specimen (e.g. in light mineral wool for low temperatures), the apparatus orientation, the thickness and the temperature difference can influence both the transfer factor and the thermal resistance. In such cases, as a minimum it is required to fully specify the geometry and the boundary conditions of the specimen tested, even though information supplied in Clause 3 on test procedures does not cover these test conditions in detail. In addition, it will take considerable knowledge to evaluate the measurement, as such, especially when applying the measured values in practice. The influence of moisture within a specimen on the heat transfer during a measurement is also a very complex matter. Therefore, dried specimens only shall be tested according to standard procedures. Measurements on moist materials need additional precautions not covered in detail in this standard. The knowledge of the physical principles mentioned is also extremely important when a heat transfer property, determined by this test method, is used to predict the thermal behaviour of a specific material in a practical application even though other factors such as workmanship can influence this behaviour. 0.3 Background required The design and subsequent correct operation of a guarded hot plate to obtain correct results and the interpretation of experimental results is a complex subject requiring great care. It is recommended that the designer, operator and the user of measured data of the guarded hot plate should have a thorough background of knowledge of heat transfer mechanism in the materials, products and systems being evaluated, coupled with experience of electrical and temperature measurements, particularly at low signal levels. Good laboratory practice in accordance with general test procedures should also be maintained. The in-depth knowledge in each area mentioned may be different for the designer, operator and data user. 0.4 Design, size and national standards Many different designs’ of guarded hot plate apparatus exist worldwide which conform to present national standards. Continuing research and development is in progress to improve the apparatus and measurement techniques. Thus, it is not practical to mandate a specific design or size of apparatus, especially as total requirements may vary quite widely.  
Contents of GB/T 10294-2008
Foreword II Introduction IV 1 General 1.1 Scope 1.2 Normative References 1.3 Terms and Definitions 1.4 Symbols and units (see Table 1) 1.5 Significance 1.6 Principle 1.7 Limitations due to apparatus 1.8 Limitations due to specimen 2 Apparatus and Error Evaluation 2.1 Apparatus description and design requirements 2.2 Evaluation of errors 2.3 Apparatus design 2.4 Performance check 3 Test Procedures 3.1 General 3.2 Test specimens 3.3 Test method 3.4 Procedures requiring multiple measurements 3.5 Calculations 3.6 Test report Annex A (Normative) Limit Values for Apparatus Performance and Testing Conditions Annex B (Informative) Thermocouples Annex C (Informative) Maximum Specimen Thickness Annex D (Informative) Bibliography Annex NA (Informative) Additional Remark
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