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GB/T 10294-2008: Thermal insulation -- Determination of steady-state thermal resistance and related properties -- Guarded hot plate apparatus
Status: Valid GB/T 10294: Evolution and historical versions
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Thermal insulation -- Determination of steady-state thermal resistance and related properties -- Guarded hot plate apparatus
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GB/T 10294-2008
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Thermal insulation--Determination of steady-state thermal resistance and related properties--Guarded hot plate apparatus
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Basic data | Standard ID | GB/T 10294-2008 (GB/T10294-2008) | | Description (Translated English) | Thermal insulation -- Determination of steady-state thermal resistance and related properties -- Guarded hot plate apparatus | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q25 | | Classification of International Standard | 91.120.10 | | Word Count Estimation | 49,423 | | Date of Issue | 2008-06-30 | | Date of Implementation | 2009-04-01 | | Older Standard (superseded by this standard) | GB/T 10294-1988 | | Quoted Standard | ISO 7345-1987; ISO 9229-1991; ISO 9251-1987; ISO 9288-1989; ISO 9346-1987 | | Adopted Standard | ISO 8302-1991, 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 calculation of the steady-state heat transfer properties of the plate-like specimen method and heat transfer properties. The method is to measure the heat transfer properties of the absolute law or arbitration law. Only need to measure the size, temperature and electric power. This standard test methods conform to the report, the thermal resistance of the specimen shall not be less than 0. 1m2 �� K/W, and a thickness not exceeding requirements 1. 7. 4. Thermal limit of the specimen can be as low 0. 02m2. K/W, but not necessarily to achieve accurate 1. 5. 3 within the full range. Only if the specimen meets the requirements 1. 8. 1, test results, said the thermal conductivity and thermal transfer coefficients or specimen. If you meet the requirements of 1. 8. 2 of the specimen, test results can be expressed by the average test piece measuring thermal conductivity. | GB/T 10294-2008: Thermal insulation -- Determination of steady-state thermal resistance and related properties -- Guarded hot plate apparatus
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Thermal insulation. Determination of steady-state thermal resistance and related properties. Guarded hot plate apparatus
ICS 91.120.10
Q25
National Standards of People's Republic of China
GB/T 10294-2008/ISO 8302.1991
Replacing GB/T 10294-1988
Determination of steady-state thermal insulation materials and related properties
Guarded hot plate
(ISO 8302.1991, 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
Foreword
This standard is identical with ISO 8302.1991 "Thermal insulation --- steady and related properties - Guarded hot plate ---" (in English).
This standard replaces GB/T 10294-1988 "steady-state thermal insulation materials and related properties - Guarded hot plate."
This standard 10294-1988 major changes compared to GB/T as follows.
--- Increased introduction;
--- Increases the thermal homogeneous material, an isotropic coefficient of thermal heat transfer body, the average thermal conductivity of the test piece, the test piece, the apparent thermal conductivity of the material
Coefficient, steady-state heat transfer properties, room temperature, operators, data users, designers and other means defined;
--- Adding a more detailed summary of symbols and units (see 1.4);
--- Increase the factors that affect heat transfer properties (see 1.5.1);
--- Sums up the device, configuration, and test parameters (see 1.6) are in principle;
--- Sums up the limit due to the generating means (see 1.7);
--- Induction due to limitations resulting specimens (see 1.8);
--- Increased thermocouple for measuring the temperature of 21K ~ 170K, the standard error limits (see 2.1.4.1.4);
--- Increasing the measurement error of the thermocouple and its connection forms generated (see 2.1.4.1.2);
--- Detailed methods to increase the thickness measurements (see 2.1.4.2);
--- Increased the thermocouple connection description (see 2.1.4.1.2);
--- Increase in the fluid-cooled metal plate design should pay attention to the problem (see 2.1.2);
--- Description flatness measurement of a minimum value of 25μm (see 2.4.1);
--- The relationship between the measured temperature difference increases (see 3.4.3);
--- Measurement report has been refined, such as "to insert a sheet material or the use of water vapor in the sealed bag between the specimen and the panel means test
Test, measurement report should be marked in the parameter (see 3.6.14) ";
--- Inclusion of this standard describes the limit values \u200b\u200band device performance test conditions (see Appendix A);
--- Based on experience gives the E-type and T-type thermocouples recommendations (special grade) Error limit (see Table B.1);
--- Increase the recommended upper temperature limit protection type thermocouple (see Table B.2);
--- Conditions lab environment changes, 7.2.2 second paragraph "293 ± 1K" to "296K ± 1K";
--- Added Appendix NA.
Appendix A of this standard is a normative appendix, Appendix B, Appendix C, Appendix D 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 Industry Association.
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. Zhang trips, including Cao sound, Wang Jiaqing, Wang Yumei, Gedui Shi, who is full, into steel.
This standard replaces the standards previously issued as follows.
--- GB/T 10294-1988.
GB/T 10294-2008/ISO 8302.1991
Introduction
0.1 Standard Architecture
This standard is divided into three chapters, describes the use and design of all the information guarded hot plate apparatus need.
1 Overview;
2 devices and error analysis;
3 during the test.
In terms of the test operator for the purpose of Chapter 3 may notice only, but in order to get accurate results, the operator also needs to be familiar with the other two chapters,
He must outline a more profound understanding. Chapter 2 direct means for the designer, but in order to create a good means he wants to focus on its
His two chapters. Thus, the standard method will better achieve their goals.
0.2 Properties of Heat Transfer and Measurement
Most of the heat transfer properties of the test is for the low density of the porous material. In this case, the material inside pass real passion
To obtain accurate results, this standard only for design and operation of guarded hot plate apparatus made necessary mandatory.
Appendix A lists the limit values \u200b\u200bof the standard set forth in the performance of the device and test conditions.
The specimen size standard also contains the recommended procedures and practical knowledge, as well as recommendations, which will raise the general level of measurement help
To improve inter-laboratory comparison measurement procedures and cooperation.
GB/T 10294-2008/ISO 8302.1991
Determination of steady-state thermal insulation materials and related properties
Guarded hot plate
1 Overview
1.1 Scope
This standard specifies the calculation using the guarded hot plate apparatus measures the plate-like specimen steady heat transfer properties and methods of heat transfer properties.
The present method is to measure the heat transfer properties of the absolute law or arbitration law, only need to measure the size, temperature, and electrical power.
The standard test methods in line with the report of the test piece the thermal resistance not less than 0.1m2 · K/W, and a thickness of no more than the requirements of 1.7.4.
Specimen thermal resistance limit can be as low 0.02m2 · K/W, but not necessarily to achieve accuracy 1.5.3 according to the full extent.
If the specimen only to meet the requirements of 1.8.1, the test results indicate the thermal conductivity and thermal transfer coefficients or specimen.
If the specimen meet the requirements of 1.8.2, the test results can be expressed by the average of the test piece can be measured thermal conductivity.
If the specimen meet the requirements of 1.8.3, the test results may indicate an apparent thermal conductivity or thermal conductivity of the material being tested.
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 Adiabatic --- Physical quantities and definitions
ISO 9229.1991 --- insulation materials, products and systems --- Vocabulary
ISO 9251. 1987 adiabatic heat transfer conditions and material properties --- --- Vocabulary
ISO 9288. 1989 radiation heat transfer insulation --- --- Physical quantities and definitions
ISO 9346. 1987 MASS insulation --- --- Physical quantities and definitions
1.3 Terms, definitions, symbols and units
ISO 7345 or ISO 9251, and established the following terms and definitions apply to this standard.
Physical symbol Unit
Heat flow Φ W
Heat flux q W/m2
Thermal Resistance 1) R m2 · K/W
Thermal conductivity Λ W/(m2 · K)
Thermal conductivity 2) λ W/(m · K)
Thermal coefficient γ m · K/W
Porosity ξ
Local porosity ξp
1) In some cases, you may want to consider is the temperature difference between the heat flow in addition, no special symbols to represent the physical, sometimes also called resistance.
2) In most cases, the direction and q → gradT different (λ
Not determined by a single constant λ, but by the constant matrix). In addition, the specimen inside
Position changes, temperature changes and time changes will lead to changes in the thermal conductivity.
Porous body porousmedium
Homogeneous body homogeneousmedium
Homogeneous porous body homogeneousporousmedium
GB/T 10294-2008/ISO 8302.1991
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