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GB/T 13475-2008: Thermal insulation -- Determination of steady-state thermal transmission Properties -- Calibrated and guard hot box
Status: Valid GB/T 13475: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 13475-2008 | English | 454 |
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Thermal insulation -- Determination of steady-state thermal transmission Properties -- Calibrated and guard hot box
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GB/T 13475-2008
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| GB/T 13475-1992 | English | 959 |
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Building element--Determinatin of steady-state thermal transmission properties--Calibrated and guarded hot box
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GB/T 13475-1992
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PDF similar to GB/T 13475-2008
Basic data | Standard ID | GB/T 13475-2008 (GB/T13475-2008) | | Description (Translated English) | Thermal insulation -- Determination of steady-state thermal transmission Properties -- Calibrated and guard hot box | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q25 | | Classification of International Standard | 91.120.10 | | Word Count Estimation | 23,254 | | Date of Issue | 2008-06-30 | | Date of Implementation | 2009-04-01 | | Older Standard (superseded by this standard) | GB/T 13475-1992 | | Quoted Standard | ISO 7345-1987 | | Adopted Standard | ISO 8990-1994 (E), IDT | | Regulation (derived from) | National Standard Approval Announcement 2008 No.11 (Total No.124) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the minimum requirements for steady-state heat transfer properties of the test chamber and the measuring device design principles of building components and industrial use similar components should meet. Due to various changes in the requirements, it is not limited to a particular design of apparatus and the operating conditions specified in the smaller range. This standard does not apply to the determination of special components, such as windows, then the need for additional procedures, these procedures are not included in this standard. Thermal properties of this standard is to measure the heat transfer coefficient and thermal resistance, provides two alternative methods: calibrated hot box and guarded hot box. Both methods are suitable for the vertical and horizontal specimen test pieces. Means capable of sufficiently large dimensions in order to study the original member. This standard applies to the measurement of large -size heterogeneity in the laboratory specimens. Also applies to the determination of the homogeneous specimen, which is the calibration and verification required. Homogeneous specimen measured according to the method specified in this standard, experience has shown that the accuracy is usually able to achieve �� 5%. However, the accuracy of each individual device, the thermal conductivity should be used in homogeneous standard test pieces were evaluated in the measuring range covered by the apparatus. For non- homogeneous specimen accuracy assessment is more complex and also contains a special type of specimen to be measured in a non- homogeneous heat Mechanism. Such analysis is beyond the scope of this standard. This standard does not apply to the testing process has passed through the specimen to measure the mass transfer phenomena. | GB/T 13475-2008: Thermal insulation -- Determination of steady-state thermal transmission Properties -- Calibrated and guard hot box
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Thermal insulation. Determination of steady-state thermal transmission Properties. Calibrated and guard hot box
ICS 91.120.10
Q25
National Standards of People's Republic of China
GB/T 13475-2008/ISO 8990.1994 (E)
Replacing GB/T 13475-1992
Determination of steady heat transfer properties of the insulation
Calibrated and guarded hot box
(ISO 8990.1994 (E), IDT)
Posted 2008-06-30
2009-04-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Preface Ⅰ
ISO Foreword Ⅱ
Introduction Ⅲ
1 Overview 1
1.1 Scope 1
1.2 Normative references 1
1.3 Terms and Definitions 1
1.4 Symbols and units 1
1.5 Principle 2
1.6 Limitations and sources of error 3
2 device device 6
2.1 Overview 6
2.2 Design Requirements 6
2.3 Measuring Box 7
2.4 enclosure 8
2.5 Specimen frame 8
2.6 cold box 8
2.7 Temperature measurement 8
2.8 Measuring Instruments 9
2.9 Performance evaluation and calibration 9
Step 3 Measure 10
3.1 Overview 10
3.2 Specimen state regulation 10
Selection and installation of the specimen 10 3.3
3.4 Test Conditions 11
3.5 Measurement cycle 11
3.6 Calculation 11
3.7 Test Report 11
Appendix A (normative) Surface heat and ambient temperature 13
A. 1 Ambient temperature 13
A. 2 ambient temperature is calculated 13
Annex B (informative) References 16
Appendix NA (informative) Supplement 17
Foreword
This standard is identical with ISO 8990.1994 (E) "insulation - Determination of steady-state thermal transmission properties - Calibrated and guarded hot box."
This standard replaces GB/T 13475-1992 "building elements steady-state thermal transmission properties - Calibrated and guarded hot box."
This standard compared with GB/T 13475-1992 main changes are as follows.
--- Standard topic made editorial changes;
--- Chapter 2 normative references have been modified;
--- Increasing the relevant provisions of the limitations and sources of error (see Section 1.6);
--- Increasing the relevant provisions of the plant design requirements (see Chapter 2);
--- Increasing the surface temperature of the relevant provisions of the device (see Chapter 2);
--- Measuring input power output power, fan heaters and the like thermopile balance accuracy has been revised (1992 version
5.7; this version 2.8);
--- Means the relevant provisions of performance evaluation and calibration have been revised and supplemented (see 2.9);
--- Revision of the relevant provisions of the specimen conditioning (1992 version 6.1; this version 3.2);
--- Delete the original standard in Appendix B, Appendix C and Appendix D (see the 1992 version of Appendix B, Appendix C and Appendix D);
--- Added Appendix B references;
--- Added Appendix NA.
Appendix A of this standard is a normative appendix, Appendix B and Appendix NA informative appendices.
Please note that some of the content of this standard may involve patents, the issuing authority of this standard should not bear the responsibility to identify these patents.
The standard proposed by China Building Materials Federation.
This standard by the National Standardization Technical Committee heat insulating material (SAC/TC191) centralized.
This standard is drafted by. Nanjing Fiberglass Research and Design Institute.
The main drafters of this standard. Wang Jiaqing, Cao sound
Chen Shang, Wang Xiyan, SUN Wen-bing.
This standard superseded standard previously issued as follows.
--- GB/T 13475-1992.
Foreword ISO
International Organization for Standardization (ISO ) is a worldwide federation of national standards bodies States (ISO member bodies). Development of international standards
Quasi work is usually done by the ISO Technical Committee Each member body interested in the field of a technical committee has been established has the right to
Participate in the work of the Commission. ISO international organizations to keep in touch (official or unofficial) may also participate in the work. Electrotechnical
Standardization, ISO and the International Electrotechnical Commission (IEC ) to maintain close relations of cooperation.
Draft International Standards adopted by the technical committees to submit to the member bodies voting, is required to obtain at least 75% of the voting members of the community
Consent to be officially released as an international standard.
International Standard ISO 8990 was developed by ISO /T C163 insulation Technical Committee/SC1 test and measurement methods Sub-Committee.
Appendix A is an integral part of this International Standard. Appendix B for information only.
Introduction
Many situations require insulation and heat transfer properties of the insulating structure data, including to determine whether compliance with regulations and standards, design guidelines, materials
Materials and building performance simulation research and verification test.
Many insulation materials and systems for heat transfer are conduction, convection and radiation of a complex combination. This International Standard describes the measurement method
At a given temperature, the specimen is passed from one side to the other side of the total heat, it does not correspond to a single mode of heat transfer, so the test results can be used
Such thermal properties required of the occasion. However, the heat transfer properties of the specimen itself often and boundary conditions, the size of the specimen, the direction of heat transfer, temperature, temperature
Poor, air speed and relative humidity. Therefore, the test conditions must be expected to reproduce the practical application of the conditions, or in the assessment test
The results measured under the conditions of whether meaningful.
It should also be remember that the determination of steady-state heat transfer and heat transfer characteristics of the nature of the specimen calculation is only able to explain or represent the actual product or system
Performance measurement in order to consider the nature of material characterization, product or system feature is useful.
In addition, only a series of measurements from a plurality of samples of a plurality of test pieces having a sufficient reproducibility, the measured properties to generations
Table characteristics of the material, product or system.
Protection or calibration hot box design and operation is a complex task. Designers use of personnel and the device must have a complete biography
Thermal background knowledge and experience in precision measurement technology.
There are many design calibration and guarded hot box apparatus in line with national standards in the world. Continued research and development of equipment and continually measure
Technology improvements. The test structures may have a very big change, the conditions of the test requirements will be different, it is not necessary to limit
Methods of measurement system and all measurements are limited to a single device it is wrong. Therefore, specify a particular design or size devices
It is unrealistic.
Determination of steady heat transfer properties of the insulation
Calibrated and guarded hot box
1 Overview
1.1 Scope
This standard specifies the laboratory steady heat transfer properties of the design principles and determination of building components and industrial components similar device should meet
Minimum requirements. Due to changes in the requirements (in particular dimensions), it is not limited to a special design of the apparatus and the operating conditions
Items specified in the smaller range.
This standard gives the means for measuring technical description data and the necessary reports.
This standard is not used to determine the specific components, such as windows, then the need for additional procedures, the standard does not cover these programs.
This standard does not consider moisture migration (or redistribution) on the measurement of heat flow, but should be considered in the design and operation of the device, because wet
Migration may affect the test results accuracy and certainty.
Thermal properties of this standard is to measure the heat transfer coefficient and thermal resistance, provides two alternative methods. calibrated hot box and guarded hot box
law. Both methods are used on the vertical specimen (such as walls) and the level of the specimen (e.g., floors and ceilings). The apparatus can be large enough to
We study full size components.
This standard applies to the measurement of large-size heterogeneity in the laboratory specimen. Also applies to the determination of a homogeneous specimen, which is to calibrate and test
Permit required.
Homogeneous specimen measured according to the method specified in this standard, experience shows that the accuracy can usually be achieved is ± 5%. However, for each
The accuracy of a single device, you should use a homogeneous heat transfer standard specimens were evaluated within the device coverage measurement range. For non
Evaluation of homogeneous specimens accuracy is more complex, and also contains a special type of heterogeneous specimens tested in the heat Mechanism.
Such analysis is beyond the scope of this standard.
This standard does not apply to the testing process through the specimen with a measurement of the mass transfer phenomena.
1.2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
ISO 7345. 1987 insulation materials --- Physical quantities and definitions
1.3 Terms and Definitions
ISO 7345. 1987 as well as to determine the following terms and definitions apply to this standard.
1.3.1
Specimen "visible" appropriate weights all surface temperature for determining the spread of radiation heat flux surface of the specimen (see Appendix A).
1.3.2
Weighted values \u200b\u200bof air temperature and radiation temperature, heat flux for determining the specimen surface (see Appendix A).
1.4 Symbols and units
Symbols used in this standard and its units are as follows.
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