EN ISO 13791:2004
(Main)Thermal performance of buildings - Calculation of internal temperatures of a room in summer without mechanical cooling - General criteria and validation procedures (ISO 13791:2004)
Thermal performance of buildings - Calculation of internal temperatures of a room in summer without mechanical cooling - General criteria and validation procedures (ISO 13791:2004)
ISO 13791:2004 specifies the assumptions, boundary conditions, equations and validation tests for a calculation procedure, under transient hourly conditions, of the internal temperatures (air and operative) during the warm period, of a single room without any cooling/heating equipment in operation. No specific numerical techniques are imposed by this standard. Validation tests are included. An example of a solution technique is given in Annex A.
ISO 13791:2004 does not contain sufficient information for defining a procedure able to determine the internal conditions of special zones such as attached sun spaces, atria, indirect passive solar components (Trombe walls, solar panels) and zones in which the solar radiation may pass through the room. For such situations different assumptions and more detailed solution models are needed.
Wärmetechnisches Verhalten von Gebäuden - Sommerliche Raumtemperaturen bei Gebäuden ohne Anlagentechnik - Allgemeine Kriterien und Validierungsverfahren (ISO 13791:2004)
Diese Norm legt die Eingabedaten und die Algorithmen zur Berechnung der sommerlichen Raumtemperatur eines einzelnen Raumes ohne Kühleinrichtung unter instationären Randbedingungen fest. Mit dieser Norm werden keine spezifischen Techniken vorgeschrieben. Im informativen Anhang C ist ein Beispiel eines Lösungsverfahrens angegeben. In Anhang A ist ein Validierungsverfahren angegeben, das die zahlenmäßige Bewertung von Lösungen ermöglicht.
Performance thermique des bâtiments - Température intérieure en été d'un local non climatisé - Critères généraux et méthodes de calculs (ISO 13791:2004)
L'ISO 13791:2004 spécifie les hypothèses, conditions aux limites, équations et essais de validation à adopter pour une méthode de calcul, en régime transitoire horaire, des températures intérieures (de l'air et de service) pendant les périodes chaudes, d'un seul local dépourvu d'installation de refroidissement/chauffage en service. L'ISO 13791:2004 n'impose aucune technique numérique particulière. Les essais de validation sont compris. Un exemple de technique de résolution est donné en Annexe A.
L'ISO 13791:2004 ne renferme pas suffisamment d'information pour définir une procédure capable de déterminer les conditions internes de zones spéciales telles que: solariums, atriums, éléments solaires passifs indirects (murs capteurs à stockage thermique ou murs Trombe, panneaux solaires) et zones dans lesquelles le rayonnement solaire peut traverser le local. Dans de telles situations, il est nécessaire de disposer de diverses hypothèses et de modèles de résolution plus détaillés.
Toplotne značilnosti stavb - Izračun notranje temperature prostorov poleti brez mehanskega hlajenja - Splošna merila in validacija postopka (ISO 13791:2004)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2005
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PHKDQVNHJDKODMHQMD6SORãQDPHULODLQYDOLGDFLMDSRVWRSND ,62
Thermal performance of buildings - Calculation of internal temperatures of a room in
summer without mechanical cooling - General criteria and validation procedures (ISO
13791:2004)
Wärmetechnisches Verhalten von Gebäuden - Sommerliche Raumtemperaturen bei
Gebäuden ohne Anlagentechnik - Allgemeine Kriterien und Validierungsverfahren (ISO
13791:2004)
Performance thermique des bâtiments - Température intérieure en été d'un local non
climatisé - Criteres généraux et méthodes de calculs (ISO 13791:2004)
Ta slovenski standard je istoveten z: EN ISO 13791:2004
ICS:
91.120.10 Toplotna izolacija stavb Thermal insulation
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 13791
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2004
ICS 91.120.10
English version
Thermal performance of buildings - Calculation of internal
temperatures of a room in summer without mechanical cooling -
General criteria and validation procedures (ISO 13791:2004)
Performance thermique des bâtiments - Calcul des Wärmetechnisches Verhalten von Gebäuden -
températures intérieures en été d'un local sans dispositif de Sommerliche Raumtemperaturen bei Gebäuden ohne
refroidissement - Critères généraux et méthodes de calcul Anlagentechnik - Allgemeine Kriterien und
(ISO 13791:2004) Validierungsverfahren (ISO 13791:2004)
This European Standard was approved by CEN on 7 June 2004.
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 Ref. No. EN ISO 13791:2004: E
worldwide for CEN national Members.
Contents
Page
Foreword.4
Introduction .5
1 Scope.6
2 Normative references.6
3 Terms, definitions, symbols and units.6
3.1 Terms and definitions .6
3.2 Symbols and units .8
3.3 Subscripts.9
4 Determination of internal temperatures .9
4.1 Assumptions.9
4.2 Evaluation of the relevant temperatures.10
4.3 Room thermal balance.13
4.4 Boundary conditions .14
4.5 Terms in the thermal balance equations .18
5 Procedure for carrying out calculations .29
5.1 General.29
5.2 Design climatic data.29
5.3 Geometrical and thermophysical characteristics of room elements.30
5.4 Design internal gains .30
5.5 Design occupant behaviour .30
5.6 Calculation procedure .30
6 Report of the calculation .31
7 Validation procedures.31
7.1 Introduction.31
7.2 Validation of heat transfer processes .32
7.3 Validation procedure for the whole calculation method .39
Annex A (informative) Example of solution technique.51
A.1 Introduction.51
A.2 Basic assumptions for the calculation method .51
A.3 Calculation procedure .51
A.4 Room thermal balance.57
Annex B (informative) Convective heat transfer through ventilated air layer.58
B.1 Introduction.58
B.2 Convective heat transfer for a vertical air layer.58
B.3 Convective heat transfer for an external horizontal air layer .62
Annex C (informative) Shading due to overhangs and side fins.64
C.1 Introduction.64
C.2 Calculation path for overhang .65
C.3 Calculation path for vertical projection at the end of the overhang .66
C.4 Calculation path for side fin.67
C.5 Calculation of the sunlit area due to short side fin .68
C.6 External obstruction .68
C.7 Sunlit factor .70
Annex D (informative) Design climatic data in the warm season.71
Annex E (informative) Calculation of the internal long-wave radiation exchanges in buildings .72
E.1 Introduction .72
E.2 Limits of application .72
E.3 Calculation procedure .72
Annex F (informative) External radiative long-wave heat transfer coefficients.73
F.1 Introduction .73
F.2 Terms and calculation procedure.73
Annex G (informative) Solar factors .75
G.1 Introduction .75
G.2 Solar to air factor.75
G.3 Distribution factors .75
G.4 Solar loss factor .76
Annex H (informative) Internal gains.77
H.1 Introduction .77
H.2 Residential building .77
H.3 Non residential building .78
Annex J (informative) Air ventilation.80
J.1 Introduction .80
J.2 Calculation procedure .80
J.3 Example of calculation of natural ventilation rates for simple building.85
Annex K (informative) Detailed results of the validation tests considered in the “whole
validation model” procedure.87
Bibliography.89
Foreword
This document (EN ISO 13791:2004) 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 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 2005.
This standard is one of a series of standards on calculation methods for the design and the evaluation of the
thermal performance of buildings and building components.
This document includes a Bibliography.
According to the CEN/CENELEC Internal Regulations, the national stand
...
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