SIST EN ISO 9346:1997

SLOVENSKI STANDARD
SIST EN ISO 9346:1997
01-december-1997
7RSORWQDL]RODFLMD3UHQRVVQRYL)L]LNDOQHNROLþLQHLQGHILQLFLMH,62
Thermal insulation - Mass transfer - Physical quantities and definitions (ISO 9346:1987)
Wärmeschutz - Stofftransport - Physikalische Größen und Definitionen (ISO 9346:1987)
Isolation thermique - Transfert de masse - Grandeurs physiques et définitions (ISO
9346:1987)
Ta slovenski standard je istoveten z: EN ISO 9346:1996
ICS:
01.060 9HOLþLQHLQHQRWH Quantities and units
27.220 Rekuperacija toplote. Heat recovery. Thermal
Toplotna izolacija insulation
SIST EN ISO 9346:1997 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 9346:1997

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SIST EN ISO 9346:1997

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SIST EN ISO 9346:1997

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SIST EN ISO 9346:1997
IS0
INTERNATIONAL STANDARD
9346
First edition
1987-1 l-01
Corrected and reprinted
1988-03-01
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
ORGANISATION INTERNATIONALE DE NORMALISATION
MEXCIYHAPOAHAFI OPTAHVl3A~MR f-IO CTAH~APTM3A~MM
Thermal insulation - Mass transfer - Physical
quantities and definitions
Isolation thermique - Transfert de masse - Grandeurs physiques et dbfinitions
Reference number
IS0 9346 : 1987 (E)

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SIST EN ISO 9346:1997
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 Council. They are approved in accordance with IS0 procedures requiring at
least 75 % approval by the member bodies voting.
International Standard IS0 9346 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.
0
International Organization for Standardization, 1987
Printed in Switzerland

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SIST EN ISO 9346:1997
~
IS0 9346 : 1987 (E)
INTERNATIONAL STANDARD
Thermal insulation - Mass transfer - Physical
quantities and definitions
0 Introduction 2 General terms
2.1 mass transfer : Transmission of mass (especially
This International Standard forms part of a series of
moisture or air) by various mechanisms.
vocabularies related to thermal insulation.
2.2 moisture : Water in gaseous, liquid or solid phase.
The series will include
2.3 water vapour : Moisture in the gaseous phase.
Physical quantities and defini-
IS 0 7345, Thermal insulation -
tions.
24 . water vapour diffusion : Movement of water vapour
molecules in a gas mixture tending to equalize the vapour con-
IS0 9251, Thermal insulation - Heat transfer conditions and
tent in the air or the partial pressure of the vapour, with the
properties of materials - Vocabulary.
total pressure being constant.
IS0 9346, Thermal insulation - Mass transfer - Physical
25 . water vapour convection : Transfer of water vapour in
quantities and definitions.
a gas mixture by movement of the whole gas mixture due to a
difference in total pressure.
IS0 9229, Thermal insulation - Thermal insulating materials
and products - Vocabulary. ‘I
2.6 hygroscopic sorption curve : Relation between
moisture content in a porous material and the relative humidity
IS0 9288, Thermal insulation - Heat transfer by radiation -
of the ambient air at equilibrium.
Physical quantities and definitions. 1 )
NOTE - There are curves for sorption and for desorption. Because of
measuring difficulties there is an upper limit for the relative humidity at
95 % to 98 %.
2.7 suction curve : Relation between the equalized moisture
1
Scope and field of application
content in a porous material and the suction (negative pore
pressure) in the pore water.
This International Standard defines physical quantities and
other terms in the field of mass transfer relevant to thermal in-
NOTE - Generally there are curves for sorption and for desorption.
sulation systems, and gives the corresponding symbols and
Theoretically the suction curve covers the whole moisture range, from
units. absolute dryness to full saturation.
1) At present at the stage of draft.

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SIST EN ISO 9346:1997
IS0 9346 : 1987 (El
Symbol Unit
3 Physical quantities and definitions
V kg/m3
3.1 humidity by volume : Mass of water vapour divided by the volume of the gaseous mixture.
NOTES
1 Humidity by volume is the same as the partial mass density of water vapour, g,.
2 At saturation the notations vsat and e,,sat are used.
x
3.2 humidity by mass : Mass of water vapour divided by the mass of dry air. b/kg
NOTE - At saturation the notation xsat is used.
: Partial pressure of water vapour in a gaseous mixture. Pa
3.3 partial water vapour pressure
Pv
NOTE - At saturation the notation Psat is used.
3.4 relative humidity : Actual humidity by volume divided by humidity by volume at saturation
at the same temperature :
V
=-
@
vsat
NOTE
- Assuming an ideal gas behaviour
pv
=-
0
Pv,sat
h J/kg
3.5 specific enthalpy : Enthalpy divided by mass.
specific latent enthalpy of evaporation or condensation h, J/kg
3.51
J/kg
3.52 specific latent enthalpy of melting (or freezing)
h,
3.6 moisture content mass by volume : Mass of evaporable water divided by volume of
W kg/m3
material.
NOTE - Volume of material can either be that of wet state or dry state and shall be specified when quoting
moisture content. The method of evaporating water from a moist material must be stated.
3.7 moisture content volume by volu
...