SVENSK STANDARD SS-EN ISO :2005

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SVENSK STANDARD SS-EN ISO 15927-5:2005 Fastställd 2005-04-29 Utgåva 1 Fukt- och värmetekniska egenskaper hos byggnader Klimatdata Del 5: Data för att bestämma byggnaders effektbehov för uppvärmning

1 SVENSK STANDARD SS-EN ISO :2005 Fastställd Utgåva 1 Fukt- och värmetekniska egenskaper hos byggnader Klimatdata Del 5: Data för att bestämma byggnaders effektbehov för uppvärmning (ISO :2004) Hygrothermal performance of buildings Calculation and presentation of climatic data Part 5: Data for design heat load for space heating (ISO :2004) ICS ; Språk: engelska Publicerad: juni 2005 Copyright SIS. Reproduction in any form without permission is prohibited.

2 Europastandarden EN ISO :2004 gäller som svensk standard. Detta dokument innehåller den engelska språkversionen av EN ISO :2004. Standarden, som även är global standard, har tagits fram inom CEN/TC 89, Thermal performance of buildings and building components, i samarbete med ISO/TC 163/SC 2, Thermal performance and energy use in the built environment/calculation methods. I standarden beskrivs hur man definierar, beräknar och presenterar klimatdata som används när man bestämmer en byggnaders effektbehov för uppvärmning. Dessa data omfattar dimensionerande utetemperatur på vintern; tillhörande vindhastighet och vindriktning. De vind- och temperaturdata som används för att beräkna den dimensionerande utetemperaturen skall vara uppmätta i enlighet med WMO 1 s riktlinjer. Denna standard ersätter SS , utgåva 2, Dimensionerande utetemperatur Byggnaders effektbehov. 1 World Meteorological Organization. Upplysningar om sakinnehållet i standarden lämnas av SIS, Swedish Standards Institute, telefon Standarder kan beställas hos SIS Förlag AB som även lämnar allmänna upplysningar om svensk och utländsk standard. Postadress: SIS Förlag AB, STOCKHOLM Telefon: Telefax: E-post: sis.sales@sis.se. Internet:

3 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN ISO November 2004 ICS ; English version Hygrothermal performance of buildings - Calculation and presentation of climatic data - Part 5: Data for design heat load for space heating (ISO :2004) Performance hygrothermique des bâtiments - Calcul et présentation des données climatiques - Partie 5: Données pour la charge calorifique de conception pour le chauffage des locaux (ISO :2004) Wärme- und feuchteschutztechnisches Verhalten von Gebäuden - Berechnung und Darstellung von Klimadaten - Teil 5: Bemessungstemperaturen der Außenluft im Winter und zugehörige Winddaten (ISO :2004) This European Standard was approved by CEN on 27 October 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 Central Secretariat 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 Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2004 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO :2004: E

4 EN ISO :2004(E) Contents Page Foreword... iv Introduction... v 1 Scope Normative references Terms, definitions, symbols and units Methods of calculation Coincident wind speed Dominant wind direction Reference altitude Presentation of data Data representing a geographical area, region or zone... 6 iii

5 EN ISO :2004(E) Foreword This document (EN ISO :2004) has been prepared by Technical Committee ISO/TC 163 "Thermal insulation" 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 May 2005, and conflicting national standards shall be withdrawn at the latest by May According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO :2004 has been approved by CEN as EN ISO :2004 without any modifications. iv

6 EN ISO :2004(E) Introduction The choice of design heat load for space heating is a matter of balancing user needs against cost. On the one hand, users expect a heating system to maintain the internal temperatures needed for health and comfort; on the other hand, very high heating demand arises from time to time, when a meteorological extreme occurs. It may be uneconomic to design heating systems for rare extremes, as this can lead to high capital (initial) cost and to lower operational efficiency of the system. The practical solution is to choose an infrequent, but not extreme, climatological value as the basis for the design load. This means that from time to time heat demand will exceed the system capacity, with the result that internal temperatures will be lower than desired, or that supplementary heating will be needed (e.g. from local heaters). The methods of calculation in this part of ISO include a standard return period or frequency, which is judged to give an acceptable balance between risk of inadequate performance and cost. The definition of winter external design temperatures also needs to reflect the interaction between buildings and their external environment. Buildings possess thermal inertia and do not respond instantly to changes in weather conditions. The time delay (or lag) before internal conditions are significantly affected varies among different types of construction and heating methods. To allow for this, winter external design temperatures, calculated according to this part of ISO 15927, can be defined over a range of periods from as short as 1 h to as long as 4 days. The influence of wind is important, as infiltration can cause a large proportion of heat loss from buildings that are not airtight; this is especially true in climates where infrequent, low temperatures are associated with high wind speeds. This part of ISO specifies that average coincident wind speed and range of directions are determined for the conditions of the winter external design temperature. v

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