1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 13791:2012Thermal performance of buildings Calculation of internal temperatures of a r o o m i n s u m m e r w i t h o u t mechanical cooling General criteria and valid
2、ation proceduresBS EN ISO 13791:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 13791:2012. It supersedes BS EN ISO 13791:2004, which is withdrawn.The UK participation in its preparation was entrusted to T e c h n i c a l C o m m i t t e e B / 5 4 0 / 8
3、 , M i r r o r c o m m i t t e e f o r I S O / T C 1 6 3 - Thermal Performance and Energy use in the built Environment.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a cont
4、ract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 67533 1 ICS 91.120.10 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the au
5、thority of the Standards Policy and Strategy Committee on 30 April 2012.Amendments issued since publicationDate T e x t a f f e c t e d EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 13791 March 2012 ICS 91.120.10 Supersedes EN ISO 13791:2004English Version Thermal performance of buildings
6、 - Calculation of internal temperatures of a room in summer without mechanical cooling -General criteria and validation procedures (ISO 13791:2012) Performance thermique des btiments - Calcul des tempratures intrieures en t dun local sans dispositif de refroidissement - Critres gnraux et procdures d
7、e validation (ISO 13791:2012) Wrmetechnisches Verhalten von Gebuden - Sommerliche Raumtemperaturen bei Gebuden ohne Anlagentechnik - Allgemeine Kriterien und Validierungsverfahren (ISO 13791:2012) This European Standard was approved by CEN on 14 March 2012. CEN members are bound to comply with the C
8、EN/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-CENELEC Management C
9、entre 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-CENELEC Management Centre has the same status as
10、the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Roma
11、nia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means r
12、eserved worldwide for CEN national Members. Ref. No. EN ISO 13791:2012: EBS EN ISO 13791:2012 EN ISO 13791:2012 (E) 3 Foreword This document (EN ISO 13791:2012) has been prepared by Technical Committee ISO/TC 163 “Thermal performance and energy use in the built environment“ in collaboration with Tec
13、hnical 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 2012, and c
14、onflicting national standards shall be withdrawn at the latest by September 2012. 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. This
15、 document supersedes EN ISO 13791:2004. 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Ge
16、rmany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 13791:2012 has been approved by CEN as a EN ISO 137
17、91:2012 without any modification. BS EN ISO 13791:2012ISO 13791:2012(E) ISO 2012 All rights reserved iiiContents Page Foreword . v Introduction . vii 1 Scope 1 2 Normative references 1 3 Terms, definitions, symbols and units 2 3.1 Terms and definitions . 2 3.2 Symbols and units . 3 3.3 Subscripts 5
18、4 Determination of internal temperatures 6 4.1 Assumptions 6 4.2 Evaluation of the relevant temperatures . 6 4.2.1 Internal air temperature 6 4.2.2 Internal surface temperature 7 4.2.3 Surface delimiting two solid layers . 8 4.2.4 Surface of an air layer . 8 4.2.5 External surface of a room element
19、9 4.2.6 Relevant temperatures for special construction elements . 9 4.3 Room thermal balance 10 4.4 Boundary conditions . 11 4.4.1 Single room 11 4.4.2 Similar rooms . 11 4.4.3 Adjacent room with defined value of the air temperature . 14 4.4.4 Floor on ground . 15 4.4.5 Cellar or crawl space . 15 4.
20、4.6 Ceiling below attic . 15 4.5 Terms in the thermal balance equations . 15 4.5.1 Heat conduction through components . 15 4.5.2 Convective heat transfer . 16 4.5.3 Short-wave radiation heat transfers 19 4.5.4 Long-wave radiation heat transfer . 23 4.5.5 Internal gains . 25 4.5.6 Heat flow due to ve
21、ntilation 26 5 Determination of internal humidity 27 6 Procedure for carrying out calculations . 27 6.1 General . 27 6.2 Design climatic data 27 6.2.1 General . 27 6.2.2 Long-period design climatic data 28 6.2.3 Design warm sequence . 28 6.3 Geometrical and thermophysical characteristics of room ele
22、ments . 28 6.4 Design internal gains 28 6.5 Design occupant behaviour . 28 6.6 Calculation procedure . 29 6.6.1 General . 29 6.6.2 Definition of the starting conditions 29 6.6.3 Prediction of the internal temperatures 29 7 Report of the calculation 29 BS EN ISO 13791:2012ISO 13791:2012(E) iv ISO 201
23、2 All rights reserved8 Validation procedures .30 8.1 Introduction 30 8.2 Validation of heat transfer processes .30 8.2.1 General 30 8.2.2 Heat conduction through opaque elements .30 8.2.3 Internal long-wave radiation exchanges .32 8.2.4 Sunlit area of a window due to external obstructions .34 8.3 Va
24、lidation procedure for the whole calculation method37 8.3.1 General 37 8.3.2 Geometry for the test rooms 38 8.3.3 Thermophysical properties of opaque walls 39 8.3.4 Properties of glazing .39 8.3.5 Solar parameters 41 8.3.6 Boundary conditions .42 8.3.7 Internal energy sources 45 8.3.8 Ventilation .4
25、6 8.3.9 Descriptions of the validation tests .46 Annex A (informative) Example of solution technique 49 Annex B (informative) Convective heat transfer through ventilated air layer.57 Annex C (informative) Shading due to overhangs and side fins 64 Annex D (informative) Design climatic data in the war
26、m season .72 Annex E (informative) Calculation of the internal long-wave radiation exchanges in buildings 73 Annex F (informative) External radiative long-wave heat transfer coefficients 75 Annex G (informative) Solar factors 77 Annex H (informative) Internal gains .79 Annex I (informative) Air vent
27、ilation 81 Annex J (informative) Detailed results of the validation tests considered in the “whole validation model” procedure 89 Annex K (informative) Calculation method for internal humidity without moisture absorption into or desorption from walls and other structures .91 Annex L (informative) No
28、rmative references to international publications with their corresponding European publications 94 Bibliography 96 BS EN ISO 13791:2012ISO 13791:2012(E) ISO 2012 All rights reserved vForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bod
29、ies (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 organization
30、s, 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 I
31、SO/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
32、 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 13791 was prepared by Technical Committee ISO/TC 163, Thermal perf
33、ormance and energy use in the built environment, Subcommittee SC 2, Calculation methods. This second edition cancels and replaces the first edition (ISO 13791:2004), which has been technically revised. The main changes compared to the previous edition are given in the following table: BS EN ISO 1379
34、1:2012ISO 13791:2012(E) vi ISO 2012 All rights reservedClause/subclause Changes 2 Added ISO 9050, ISO 10292, ISO 15099, ISO 15927-2 and EN 673 3.2 Deleted qaand vmand added ma4.2.1 Amended Equation (1) Deleted ma,iand added the descriptions of aand vai4.5.6.1 Replaced qaby ma8.3.9.1 Amended the valu
35、es in Tables 22 and 23 8.3.9.2 Amended the values in Tables 24 and 25 I.2.2 Replaced m by maAmended Equation (I.1) and added the descriptions of n and p0Amended Equation (I.4) and added the description of CwAmended the unit used in Table I.1 I.2.3 Replaced m, mwand mTby ma, ma,wand ma,T, respectivel
36、y Amended Equations (I.5), (I.6), (I.9), (I.10), (I.11), (I.12), (I.13) and (I.14) Replaced A by ATin Equation (I.13) Replaced cpby CwAdded the descriptions of Equations (I.8) and (I.10) I.2.3.3.3 Amended the description I.2.3.3.3 I.3.2 Replaced cpby CwReplaced mw by ma,wI.3.3 Replaced mTby ma,TAnne
37、x J Amended the values in Tables J.1 and J.2 Annex K Added as a new annex BS EN ISO 13791:2012ISO 13791:2012(E) ISO 2012 All rights reserved viiIntroduction This International Standard is intended for use by specialists to develop and/or validate methods for the hourly calculation of the internal te
38、mperatures of a single room. Examples of application of such methods include: a) assessing the risk of internal overheating; b) optimizing aspects of building design (building thermal mass, solar protection, ventilation rate, etc.) to provide thermal comfort conditions; c) assessing whether a buildi
39、ng requires mechanical cooling. Criteria for building performance are not included. They can be considered at national level. This International Standard can also be used as a reference to develop more simplified methods for the above and similar applications. BS EN ISO 13791:2012BS EN ISO 13791:201
40、2INTERNATIONAL STANDARD ISO 13791:2012(E) ISO 2012 All rights reserved 1Thermal performance of buildings Calculation of internal temperatures of a room in summer without mechanical cooling General criteria and validation procedures 1 Scope This International Standard specifies the assumptions, bound
41、ary conditions, equations and validation tests for a calculation procedure, under transient hourly conditions, of the internal temperatures (air and operative) during warm periods, of a single room without any cooling/heating equipment in operation. No specific numerical techniques are imposed by th
42、is International Standard. Validation tests are included in Clause 8. An example of a solution technique is given in Annex A. This International Standard does not contain sufficient information for defining a procedure able to determine the internal conditions of special zones such as attached sun s
43、paces, 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 (see Bibliography). 2 Normative references The following referenced do
44、cuments are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 6946, Building components and building elements Thermal resistance and t
45、hermal transmittance Calculation method ISO 7345, Thermal insulation Physical quantities and definitions ISO 9050, Glass in building Determination of light transmittance, solar direct transmittance, total solar energy transmittance, ultraviolet transmittance and related glazing factors ISO 9251, The
46、rmal insulation Heat transfer conditions and properties of materials Vocabulary ISO 9288, Thermal insulation Heat transfer by radiation Physical quantities and definitions ISO 9346, Hygrothermal performance of buildings and building materials Physical quantities for mass transfer Vocabulary ISO 1007
47、7-1, Thermal performance of windows, doors and shutters Calculation of thermal transmittance Part 1: General ISO 10077-2, Thermal performance of windows, doors and shutters Calculation of thermal transmittance Part 2: Numerical method for frames ISO 10292, Glass in building Calculation of steady-sta
48、te U values (thermal transmittance) of multiple glazing ISO 13370, Thermal performance of buildings Heat transfer via the ground Calculation methods BS EN ISO 13791:2012ISO 13791:2012(E) 2 ISO 2012 All rights reservedISO 15099, Thermal performance of windows, doors and shading devices Detailed calcu
49、lations ISO 15927-2, Hygrothermal performance of buildings Calculation and presentation of climatic data Part 2: Hourly data for design cooling load EN 410, Glass in building Determination of luminous and solar characteristics of glazing EN 673, Glass in building Determination of thermal transmittance (U value) Calculation method 3 Terms, definitions, symbols and units 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 7345,
