ISO 8302:1991 PDF

Name: ISO 8302:1991 — Thermal insulation — Determination of steady-state thermal resistance and related properties — Guarded hot plate apparatus
SKU: ISO 8302:1991
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Thermal insulation — Determination of steady-state thermal resistance and related properties — Guarded hot plate apparatus

Название (английский):

ISO 8302:1991

Thermal insulation — Determination of steady-state thermal resistance and related properties — Guarded hot plate apparatus

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 47
Дата публикации:: 15 августа 1991 г.
Издание:: ISO IS 8302 edition 1 version 1
ICS:: 27.220

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Описание (английский):

Defines the use of the guarded hot plate method to measure the steady-state heat transfer through flat slab specimens and the calculation of its heat transfer properties. Annex A forms an integral part of this standard. Annexes B, C and D are for information only.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 8302:1991 - Thermal insulation - Determination of steady-state thermal resistance and related properties - Guarded hot plate apparatus - specifies the guarded hot plate method for measuring steady-state heat transfer through flat slab specimens and calculating their heat transfer properties. It is an absolute (primary) method that requires only measurements of length, temperature and electrical power. Annex A is integral; Annexes B, C and D provide informative guidance.

Keywords: ISO 8302:1991, guarded hot plate, thermal insulation, steady-state thermal resistance, thermal conductivity, transfer factor.

Key topics and requirements

Method scope: measurement of steady-state heat flow through flat slab specimens and derivation of properties such as thermal resistance, thermal conductance, mean thermal conductivity, and transfer factor (apparent/effective conductivity).

Document structure: three main sections covering General principles, Apparatus and error evaluation, and Test procedures, plus annexes on performance limits, thermocouples, maximum specimen thickness and bibliography.

Apparatus: design requirements, performance checks and error evaluation for a guarded hot plate apparatus. Designers are given latitude in geometry but must meet specified performance limits (see Annex A).

Measurement essentials: only length, temperature and electrical power measurements are required; recommended good laboratory practice and operator expertise in heat transfer and low-level electrical/temperature measurement.

Specimen requirements and limitations:

Dried specimens recommended; moisture effects are complex and not covered in detail.
Radiation and possible internal convection can affect results - orientation, thickness and temperature difference must be reported.
Results may be reported as thermal conductance/resistance or transfer factor when specimen conditions are limited; full mean thermal conductivity can be reported only when stricter specimen requirements are met.

Accuracy notes: reports should not claim measurements for specimens with thermal resistance below 0.1 m2·K/W (though values as low as 0.02 m2·K/W are possible with reduced accuracy).

Practical applications

Laboratory measurement and certification of insulation materials (mineral wool, foams, board materials).

Development and verification of thermal models and product datasheets.

Inter-laboratory comparisons and reference testing to validate guarded hot plate apparatus performance.

Research into radiative, conductive and convective contributions to heat transfer in porous insulating materials.

Who should use this standard

Test laboratories and quality-control facilities measuring thermal properties.

Instrument designers and manufacturers of guarded hot plate apparatus.

Material scientists, building physics engineers, and product developers specifying insulation performance.

Data users applying measured thermal properties in simulations, product selection or regulatory compliance.

ISO 8302:1991 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Practical applications

Who should use this standard

Related standards

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