ISO/DIS 15927-4.2

Hygrothermal performance of buildings -- Calculation and presentation of climatic data

Performance hygrothermique des bâtiments -- Calcul et présentation des données climatiques

Standards Content (sample)

DRAFT INTERNATIONAL STANDARD ISO/DIS 15927-4.2
ISO/TC 163/SC 2 Secretariat: NSF
Voting begins on: Voting terminates on:
2003-05-29 2003-07-29

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION

Hygrothermal performance of buildings — Calculation and
presentation of climatic data —
Part 4:
Data for assessing the annual energy for cooling and heating
systems

Performance hygrothermique des bâtiments — Calcul et présentation des données climatiques —

Partie 4: Données permettant d'évaluer la demande annuelle en énergie des systèmes de climatisation et de

chauffage
ICS 07.060; 91.120.10
ISO/CEN PARALLEL ENQUIRY

This draft International Standard is a draft European Standard developed within the European Committee

for Standardization (CEN) and processed under the CEN-lead mode of collaboration as defined in the

Vienna Agreement. The document has been transmitted by CEN to ISO for circulation for ISO member

body voting in parallel with CEN enquiry. Comments received from ISO member bodies, including those

from non-CEN members, will be considered by the appropriate CEN technical body. Accordingly, ISO

member bodies who are not CEN members are requested to send a copy of their comments on

this DIS directly to CEN/TC 89 (BST, 27, Möllerörsgatan, S - 216 11 Malmö) as well as returning their

vote and comments in the normal way to the ISO Central Secretariat. Should this DIS be accepted,

a final draft, established on the basis of comments received, will be submitted to a parallel two-month

FDIS vote in ISO and formal vote in CEN.

In accordance with the provisions of Council Resolution 15/1993 this document is circulated in

the English language only.

Conformément aux dispositions de la Résolution du Conseil 15/1993, ce document est distribué

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REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.

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© International Organization for Standardization, 2003
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ISO/DIS 15927-4
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prEN ISO 15927-4:2003 (E)
Contents Page

Foreword......................................................................................................................................................................3

1 Scope ..............................................................................................................................................................5

2 Normative references ....................................................................................................................................5

3 Definitions, symbols and units.....................................................................................................................5

3.1 Definitions.......................................................................................................................................................5

3.2 Symbols and quantities.................................................................................................................................6

4 Sources of meteorological data ...................................................................................................................6

5 Construction of reference year.....................................................................................................................6

5.1 Necessary parameters...................................................................................................................................6

5.2 Principle of construction...............................................................................................................................7

5.3 Procedure .......................................................................................................................................................7

6 Presentation of the reference years.............................................................................................................8

Bibliography ................................................................................................................................................................9

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prEN ISO 15927-4:2003 (E)
Foreword

This document (prEN ISO 15927-4) has been prepared by Technical Committee CEN/TC 89 "Thermal performance

of buildings and building components", the secretariat of which is held by SIS, in collaboration with Technical

Committee ISO/TC 163 "Thermal performance and energy use in the built environment", Subcommittee SC 2

"Calculation methods".
This document is currently submitted to the second parallel Enquiry.

This standard is one of a series of standards, which specify methods for analysing meteorological data for use in

the evaluation of the energy and moisture performance of buildings. ISO 15927, Hygrothermal performance of

buildings – Calculation and presentation of climatic data, consists of six parts:

 Part 1: Monthly and annual means of single meteorological elements
 Part 2: Data for design cooling loads and risk of overheating

 Part 3: Calculation of a driving rain index for vertical surfaces from hourly wind and rain data

 Part 4: Data for assessing the annual energy for heating and cooling
 Part 5: Winter external design air temperatures and related wind data

 Part 6: Accumulated temperature differences for assessing energy use in space heating

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prEN ISO 15927-4:2003 (E)
Introduction

This standard covers the selection of appropriate meteorological data for the assessment of the long-term mean

energy use for heating and cooling of buildings. Means of selecting data to assess the maximum cooling demand

likely to occur once every ten years are specified in ISO 15927-2 and the maximum heating demand in

ISO 15927-5 .

Correct simulation of building performance depends not only on the appropriate mean values of the meteorological

parameters, but also on the frequency distributions of individual parameters and the cross correlations between

them. As these can be difficult to retain in the type of artificially constructed reference year discussed in this

standard the use of long periods (at least ten years but preferably more) of hourly meteorological data should be

preferred where possible. This also takes account of long spells of unusually warm or cold weather, lasting several

months, which will be eliminated in the construction of a Reference Year. In practice, however, long runs of hourly

data containing all the necessary parameters are very expensive and can be difficult to obtain for many areas.

There is, therefore, still a need for annual sets of data which can be used to represent the long term mean

per
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