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SIST EN ISO 15927-3:2009
01-junij-2009
Higrotermalne značilnosti stavb - Izračun in predstavitev podnebnih podatkov - 3.
del: Računanje indeksa padavin za navpične površine na podlagi hitrosti vetra in
količine dežja (ISO 15927-3:2009)
Hygrothermal performance of buildings - Calculation and presentation of climatic data -
Part 3: Calculation of a driving rain index for vertical surfaces from hourly wind and rain
data (ISO 15927-3:2009)
Wärme- und feuchteschutztechnisches Verhalten von Gebäuden - Berechnung und
Darstellung von Klimadaten - Teil 3: Berechnung des Schlagregenindexes für senkrechte
Oberflächen aus stündlichen Wind- und Regendaten (ISO 15927-3:2009)
Performance hygrothermique des bâtiments - Calcul et présentation des données
climatiques - Partie 3: Calcul d'un indice de pluie battante pour surfaces verticales à
partir de données horaires de vent et de pluie (ISO 15927-3:2009)
Ta slovenski standard je istoveten z: EN ISO 15927-3:2009
ICS:
07.060 Geologija. Meteorologija. Geology. Meteorology.
Hidrologija Hydrology
91.120.10 Toplotna izolacija stavb Thermal insulation of
buildings
SIST EN ISO 15927-3:2009 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 15927-3:2009
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SIST EN ISO 15927-3:2009
EUROPEAN STANDARD
EN ISO 15927-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2009
ICS 91.120.10; 07.060
English Version
Hygrothermal performance of buildings - Calculation and
presentation of climatic data - Part 3: Calculation of a driving
rain index for vertical surfaces from hourly wind and rain data
(ISO 15927-3:2009)
Performance hygrothermique des bâtiments - Calcul et Wärme- und feuchteschutztechnisches Verhalten von
présentation des données climatiques - Partie 3: Calcul Gebäuden - Berechnung und Darstellung von Klimadaten -
d'un indice de pluie battante pour surfaces verticales à Teil 3: Berechnung des Schlagregenindexes für senkrechte
partir de données horaires de vent et de pluie (ISO 15927- Oberflächen aus stündlichen Wind- und Regendaten (ISO
3:2009) 15927-3:2009)
This European Standard was approved by CEN on 31 January 2009.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15927-3:2009: E
worldwide for CEN national Members.
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SIST EN ISO 15927-3:2009
EN ISO 15927-3:2009 (E)
Contents Page
Foreword .3
2
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SIST EN ISO 15927-3:2009
EN ISO 15927-3:2009 (E)
Foreword
This document (EN ISO 15927-3:2009) has been prepared by Technical Committee ISO/TC 163 "Thermal
performance and energy use in the built environment" in collaboration with Technical Committee CEN/TC 89
“Thermal performance of buildings and building components”, the secretariat of which is held by SIS.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by September 2009, and conflicting national standards shall be
withdrawn at the latest by September 2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
3
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SIST EN ISO 15927-3:2009
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SIST EN ISO 15927-3:2009
INTERNATIONAL ISO
STANDARD 15927-3
First edition
2009-03-15
Hygrothermal performance of
buildings — Calculation and presentation
of climatic data —
Part 3:
Calculation of a driving rain index for
vertical surfaces from hourly wind and
rain data
Performance hygrothermique des bâtiments — Calcul et présentation
des données climatiques —
Partie 3: Calcul d'un indice de pluie battante pour surfaces verticales à
partir de données horaires de vent et de pluie
Reference number
ISO 15927-3:2009(E)
©
ISO 2009
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SIST EN ISO 15927-3:2009
ISO 15927-3:2009(E)
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ii © ISO 2009 – All rights reserved
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SIST EN ISO 15927-3:2009
ISO 15927-3:2009(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Terms, definitions, symbols and units . 2
3 Calculation of airfield indices from hourly wind and rain data. 4
4 Estimation of the effect of driving rain from average wind and present weather code for
rain. 4
5 Calculation of wall indices. 5
Annex A (informative) Limits to the validity of the calculated indices . 11
Annex B (informative) The nature of a “spell” of driving rain . 12
Annex C (informative) The procedure for generating the driving-rain maps. 13
Annex D (informative) Comparison of methods specified in Clauses 3 and 4 . 15
Bibliography . 17
© ISO 2009 – All rights reserved iii
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SIST EN ISO 15927-3:2009
ISO 15927-3:2009(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
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, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 15927-3 was prepared by the European Committee for Standardization (CEN) Technical Committee
CEN/TC 89, Thermal performance of buildings and building components, in collaboration with Technical
Committee ISO/TC 163, Thermal performance and energy use in the built environment, Subcommittee SC 2,
Calculation methods, in accordance with the Agreement on technical cooperation between ISO and CEN
(Vienna Agreement).
ISO 15927 consists of the following parts, under the general title Hygrothermal performance of buildings —
Calculation and presentation of climatic data:
⎯ Part 1: Monthly means of single meteorological elements
⎯ Part 2: Hourly data for design cooling load
⎯ Part 3: Calculation of a driving rain index for vertical surfaces from hourly wind and rain data
⎯ Part 4: Hourly data for assessing the annual energy use for heating and cooling
⎯ Part 5: Data for design heat load for space heating
⎯ Part 6: Accumulated temperature differences (degree-days)
iv © ISO 2009 – All rights reserved
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SIST EN ISO 15927-3:2009
ISO 15927-3:2009(E)
Introduction
This part of ISO 15927 specifies two procedures for analysing data derived from hourly observations of wind
and rainfall so as to provide an estimate in terms of both an annual average and short-term spells of the
quantity of water likely to impact on a wall of any given orientation.
[1]
The first method, which uses hourly observations of wind and rainfall, is based closely on BS 8104 , which
originated from a long series of measurements of driving rain on buildings in a wide range of locations within
the UK. As such, the method applies to climates similar to those in the UK; in other regions, with very different
climates, it is recommended that confirmation of its applicability be obtained by measurements of driving rain
on representative buildings.
Where hourly observations of wind and rain are not available, the second procedure, based on the present
weather code for rain and average wind speeds can be used.
In all cases, especially in mountainous areas, it is important that direct measurements of the rain impacting on
building façades be made wherever possible.
Rain penetration around the edges of doors and windows or similar cracks in building façades depends on
shorter periods of heavy rain and strong winds.
© ISO 2009 – All rights reserved v
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SIST EN ISO 15927-3:2009
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SIST EN ISO 15927-3:2009
INTERNATIONAL STANDARD ISO 15927-3:2009(E)
Hygrothermal performance of buildings — Calculation and
presentation of climatic data —
Part 3:
Calculation of a driving rain index for vertical surfaces from
hourly wind and rain data
1 Scope
This part of ISO 15927 specifies two procedures for providing an estimate of the quantity of water likely to
impact on a wall of any given orientation. It takes account of topography, local sheltering and the type of
building and wall.
The first method, given in Clause 3 and based on coincident hourly rainfall and wind data, defines a means of
calculating
⎯ the annual average index, which influences the moisture content of an absorbent surface, such as
masonry, and
⎯ the spell index, which influences the likelihood of rain penetration through masonry and joints in other
walling systems.
The second method, given in Clause 4 and based on average wind data and a qualitative recording of the
presence and intensity of rain (the present weather code for rain), defines a means of calculating the spell
length during which an absorbent material such as masonry is moistened, which has a 10 % probability of
being exceeded in any year (commonly referred to as having a mean return period of 10 years).
A comparison between the two methods is given in informative Annex D.
Procedures are given to correct the results of both methods for topography, local sheltering and the type of
building and wall.
The methods included in this part of ISO 15927 do not apply in
a) mountainous areas with sheer cliffs or deep gorges,
b) areas in which more than 25 % of the annual rainfall comes from severe convective storms,
c) areas and periods when a significant proportion of precipitation is made up of snow or hail.
© ISO 2009 – All rights reserved 1
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SIST EN ISO 15927-3:2009
ISO 15927-3:2009(E)
2 Terms, definitions, symbols and units
For the purposes of this document, the following terms, definitions, symbols and units apply.
2.1 Definitions
2.1.1
spell
period, or sequence of periods, of wind-driven rain on a vertical surface of given orientation
NOTE Further information about spells is given in Annex B.
2.1.2
airfield hourly index
quantity of driving rain that would occur on a vertical wall of given orientation per square metre of wall during
1 h at a height of 10 m above ground level in the middle of an airfield, at the geographical location of the wall
2.1.3
airfield annual index
airfield index for a given wall orientation totalled over one year
2.1.4
airfield spell index
airfield index for a given wall orientation totalled over the worst spell likely to occur in any three-year period
2.1.5
wall annual index
quantity of wind-driven rain per square metre at a point on a wall of given orientation, based on the airfield
annual index and corrections for roughness, topography, obstruction and wall factors
2.1.6
wall spell index
quantity of wind-driven rain per square metre at a point on a given wall, based on the airfield spell index and
corrections for roughness, topography, obstruction and wall factors
2.1.7
line of sight
horizontal view away from the wall, over a sector spanning about 25° either side of the normal to the wall
2.1.8
terrain roughness category
classification of the surface roughness upwind in terms of the average height and spacing of obstructions such
as buildings, trees or hedges
2.1.9
roughness coefficient
factor that allows for the modification of the wind speed by the roughness of the terrain upwind of a wall
2.1.10
topography coefficient
factor that allows for the effect of local topography on the wind speed
2.1.11
obstruction factor
factor that relates to shelter from the very local environment and allows for obstructions such as buildings,
fences and trees close to, and upwind of, the wall
2.1.12
wall factor
ratio of the quantity of water hitting a wall to the quantity passing through an equivalent unobstructed space,
allowing for the characteristics of the wall
2 © ISO 2009 – All rights reserved
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SIST EN ISO 15927-3:2009
ISO 15927-3:2009(E)
2.1.13
wall orientation
angle between north and line normal to a wall
2.1.14
convective storm
heavy precipitation in the form of showers or thunderstorms generally lasting less than 1 h
2.1.15
reference spell
period during which a wall oriented in any given direction is moistened, having a 10 % probability of being
exceeded in any year
2.1.16
present weather code
numerical code used by meteorological observers to assess the weather conditions at the time of an
observation
[2]
NOTE Present weather codes are given in the WMO Guide .
2.1.17
half day
twelve-hour period including the hours from 07:00 to 18:00 or from 19:00 to 06:00
2.2 Symbols and units
Symbol Quantity Unit
C roughness coefficient —
R
C topography coefficient —
T
D hourly mean wind direction from north °
H effective height of feature m
2
I airfield annual index l/m
A
2
I airfield spell index l/m
S
2
I wall annual index l/m
WA
2
I wall spell index l/m
WS
K terrain factor —
R
L length m
N number of years of available data —
O obstruction factor —
r hourly rainfall total mm
v hourly mean wind speed m/s
W wall factor —
x horizontal distance m
z height above ground m
z roughness length m
0
z minimum height m
min
Θ wall orientation relative to north °
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SIST EN ISO 15927-3:2009
ISO 15927-3:2009(E)
3 Calculation of airfield indices from hourly wind and rain data
3.1 Sources of data
Data used for calculations according to this part of
...