SIST EN ISO 9251:1997
(Main)Thermal insulation - Heat transfer conditions and properties of materials - Vocabulary (ISO 9251:1987)
Thermal insulation - Heat transfer conditions and properties of materials - Vocabulary (ISO 9251:1987)
Defines terms used in the field of thermal insulation to describe heat transfer conditions, such as steady state, non-steady state, periodic state, transient state and heat transfer, and properties of materials.
Wärmeschutz - Zustände der Wärmeübertragung und Stoffeigenschaften - Begriffe (ISO 9251:1987)
In dieser Internationalen Norm werden Begriffe festgelegt, die im Bereich des Wärmeschutzes zur Beschreibung der Bedingungen der Wärmeübertragung und der Stoffeigenschaften verwendet werden.
Isolation thermique - Conditions de transfert thermique et propriétés des matériaux - Vocabulaire (ISO 9251:1987)
La présente Norme internationale définit des termes utilisés dans le domaine de l'isolation thermique pour décrire les conditions de transfert thermique et les propriétés des matériaux.
Toplotna izolacija - Pogoji prenosa toplote in lastnosti materialov - Slovar (ISO 9251:1987)
General Information
- Status
- Published
- Publication Date
- 30-Nov-1997
- Technical Committee
- TOP - Thermal insulation
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-1997
- Due Date
- 01-Dec-1997
- Completion Date
- 01-Dec-1997
- Directive
- 89/106/EEC - Construction products
Overview
The SIST EN ISO 9251:1997 standard, titled Thermal insulation - Heat transfer conditions and properties of materials - Vocabulary, provides a comprehensive glossary of terms used in the thermal insulation sector. Developed by the European Committee for Standardization (CEN) in alignment with ISO 9251:1987, this standard plays a critical role in harmonizing the terminology related to heat transfer conditions and material properties. It defines key concepts such as steady state, non-steady state, periodic state, transient state, and various material attributes essential for consistent communication and application in thermal insulation engineering.
Key Topics
This standard focuses on the precise definitions of terms relevant to the fields of heat transfer and thermal insulation materials, which are vital for engineers, researchers, and professionals working on insulation design and performance evaluation. Key topics include:
Heat transfer conditions:
- Steady state - situation where heat transfer parameters do not change over time.
- Non-steady state - parameters vary with time.
- Periodic state - parameters repeat regularly over time intervals, independently of initial conditions.
- Transient state - parameters evolve from an initial condition toward a steady or periodic state.
Heat transfer mechanisms:
- Conduction, convection, radiation, or their combinations are clearly defined for accurate description in thermal processes.
Material properties:
- Porosity - ratio of void volume to total volume in porous materials, including local porosity concepts.
- Types of porous media such as fibrous, granular, cellular, and consolidated media are classified based on structure and phases.
- Homogeneous vs. heterogeneous media based on spatial uniformity of properties.
- Isotropic and anisotropic media concerning directional dependence of material properties.
- Density and its relevance in porous and granular materials are also outlined.
Applications
SIST EN ISO 9251:1997 serves as a vital reference for various practical applications within the thermal insulation and energy efficiency industries, including:
- Thermal insulation design: Enables engineers to accurately describe thermal performance and transfer conditions when selecting or designing insulation materials.
- Energy management and heat recovery: Facilitates a shared understanding of heat transfer principles crucial to optimizing building envelopes, HVAC systems, and industrial processes.
- Material research and development: Provides standardized terminology aiding in the characterization and comparison of new insulation products and materials.
- Quality assurance and compliance: Assists manufacturers and testing laboratories in ensuring products meet recognized definitions and performance criteria consistent with international standards.
Related Standards
SIST EN ISO 9251:1997 is part of a larger suite of standards aimed at thermal insulation and related measurements, enhancing clarity and consistency across various aspects of the field:
- ISO 7345: Thermal insulation - Physical quantities and definitions.
- ISO 9346: Thermal insulation - Mass transfer - Physical quantities and definitions.
- ISO 9229: Thermal insulation - Thermal insulating materials and products - Vocabulary.
- ISO 9288: Thermal insulation - Heat transfer by radiation - Physical quantities and definitions.
These complementary standards together support a holistic and precise framework for thermal insulation terminology, measurement methods, and material classifications.
Keywords: thermal insulation standard, heat transfer conditions, thermal properties vocabulary, steady state heat transfer, non-steady state, thermal conductivity, porous media, insulating materials, EN ISO 9251, heat recovery, energy efficiency.
Frequently Asked Questions
SIST EN ISO 9251:1997 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Thermal insulation - Heat transfer conditions and properties of materials - Vocabulary (ISO 9251:1987)". This standard covers: Defines terms used in the field of thermal insulation to describe heat transfer conditions, such as steady state, non-steady state, periodic state, transient state and heat transfer, and properties of materials.
Defines terms used in the field of thermal insulation to describe heat transfer conditions, such as steady state, non-steady state, periodic state, transient state and heat transfer, and properties of materials.
SIST EN ISO 9251:1997 is classified under the following ICS (International Classification for Standards) categories: 01.040.27 - Energy and heat transfer engineering (Vocabularies); 27.220 - Heat recovery. Thermal insulation. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN ISO 9251:1997 is associated with the following European legislation: EU Directives/Regulations: 305/2011, 89/106/EEC. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
You can purchase SIST EN ISO 9251:1997 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-1997
Toplotna izolacija - Pogoji prenosa toplote in lastnosti materialov - Slovar (ISO
9251:1987)
Thermal insulation - Heat transfer conditions and properties of materials - Vocabulary
(ISO 9251:1987)
Wärmeschutz - Zustände der Wärmeübertragung und Stoffeigenschaften - Begriffe (ISO
9251:1987)
Isolation thermique - Conditions de transfert thermique et propriétés des matériaux -
Vocabulaire (ISO 9251:1987)
Ta slovenski standard je istoveten z: EN ISO 9251:1995
ICS:
01.040.27 Prenos energije in toplote Energy and heat transfer
(Slovarji) engineering (Vocabularies)
27.220 Rekuperacija toplote. Heat recovery. Thermal
Toplotna izolacija insulation
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
INTERNATIONAL STANDARD
IS0
NORME INTERNATIONALE
First edition
Premiere kdition
1987-12-01
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
ORGANISATION INTERNATIONALE DE NORMALISATION
MEXAYHAPOJJHAH OPTAHM3A~M~ fl0 CTAHflAPTM3A~MM
Thermal in”sulation - Heat transfer conditions and
properties of materials - Vocabulary
Isolation thermique - Conditions de transfert
thermique et propriMs des materiaux - Vocabulaire
Reference number
Numkro de rkfh-ence
IS0 925 1 : 1987 (E/F)
Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards bodies (IS0 member bodies). The work of preparing International
Standards is normally carried out through IS0 technical committees. Each member
body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, govern-
mental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Coun’cil. They are approved in accordance with IS0 procedures requiring at
least 75 % approval by the member bodies voting.
International Standard IS0 9251 was prepared by Technical Committee ISO/TC 163,
Thermal insulation.
Users should note that all International Standards undergo revision from time to time
and that any reference made herein to any other International Standard implies its
latest edition, unless otherwise stated.
Avant-propos
L’ISO (Organisation internationale de normalisation) est une federation mondiale
d’organismes nationaux de normalisation (cornit& membres de I’ISO). LAaboration
des Normes internationales est normalement confide aux cornit& techniques de I’ISO.
Chaque cornit membre intAres& par une &ude a le droit de faire partie du cornit
technique cr& a cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I’ISO participent egalement aux. travaux.
Les projets de Normes internationales adopt& par les comit6s techniques sont soumis
aux cornit& membres pour approbation, avant leur acceptation comme Normes inter-
nationales par le Conseil de I’ISO. Les Normes internationales sont approuv6es confor-
m6ment aux proc6dures de I’ISO qui requierent I’approbation de 75 % au moins des
cornit& membres votants.
La Norme internationale IS0 9251 a et6 6labor6e par le cornit technique ISO/TC 163,
lsola tion thermique.
L’attention des utilisateurs est attir6e sur le fait que toutes les Normes internationales
sont de temps en temps soumises 3 Gvision et que toute reference faite B une autre
Norme internationale dans le present document implique qu’il s’agit, sauf indication
contraire, de la derni&e 6dition.
0 International Organization for Standardization, 1987 l
@ Organisation internationale de normalisation, 1987 l
Printed in Switzerland/lmprimb en Suisse
INTERNATIONAL STANDARD
IS0 9251 : 1987 (E/F)
NORME INTERNATIONALE
Isolation thermique -
Thermal insulation - Heat
Conditions de transfert
transfer conditions and
thermique et propriMs des
properties of materials -
materiaux - Vocabulaire
Vocabulary
0 Introduction 0 Introduction
This International Standard forms part of a series of La presente Norme internationale fait partie d’une serie de
vocabularies related to thermal insulation. vocabulaires de I’isolation thermique.
La serie comportera
The series will include
IS0 7345, Isolation thermique - Grandeurs physiques et defi-
I SO 7345, Thermal insulation - Physical quantities and defini-
nitions.
tions.
I SO 9251, Isolation thermique - Conditions de transfert ther-
IS0 9251, Thermal insulation - Heat transfer conditions and
propertl’es of materials - Vocabulary. mique et proprietes des materiaux - Vocabulaire.
IS0 9346, Thermal insulation - Mass transfer - Physical IS0 9346, Isolation thermique - Transfer-t de masse - Gran-
deurs physiques et definitions.
quantities and definitions.
IS0 9229, Isolation thermique - Materiaux et produits iso-
IS0 9229, Thermal insulation - Thermal insulating materials
and products - Vocabulary. 1 ) lants - Vocabulaire. 1 )
I SO 9288, Thermal insulation - Heat transfer by radiation - IS 0 9208, lsola tion thermique - Jransfert de chaleur par radia-
Physical quantities and dehnitions. 1 ) tion - Grandeurs physiques et definitions. ’ )
1 Objet et domaine d’ap’plication
1 Scope and field of application
La presente Norme internationale definit des termes utilises
This International Standard defines terms used in the field of
thermal insulation to describe heat transfer conditions and dans le domaine de I’isolation thermique pour decrire les condi-
tions de transfert thermique et les proprietes des materiaux.
properties of materials.
2 Conditions de transfert thermique
2 Heat transfer conditions
Condition for which all relevant 2.1 &at stationnaire : &at dans lequel tous les parametres
2.1 steady state :
parameters do not vary with time. utiles sont independants du temps.
Condition for which relevant 2.2 &at non stationnaire : kat dans lequel les parametres
2.2 non-steady state :
utiles varient avec le temps.
parameters vary with time.
2.3 periodic state : Non-steady state in which values of the 2.3 &at pbriodique : &at non stationnaire
...
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