1、BS EN ISO13789:2007ICS 91.120.10NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDThermal performanceof buildings Transmission andventilation heattransfer coefficients Calculation method(ISO 13789:2007)This British Standardwas published under theauthority of the S
2、tandardsPolicy and StrategyCommittee on 31 October2008 BSI 2008ISBN 978 0 580 54446 0Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 13789:2007National forewordThis British Standard is the UK implementation of EN ISO 13789:2007.It is identical to . It supersedes BS EN ISO 13789:
3、1999 which iswithdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/540, Energy performance of materials components andbuildings.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to incl
4、ude all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 13789December 2007ICS 91.120.10 Supersedes EN ISO 13789:1999 English
5、VersionThermal performance of buildings - Transmission and ventilationheat transfer coefficients - Calculation method (ISO 13789:2007)Performance thermique des btiments - Coefficients detransfert thermique par transmission et par renouvellementdair - Mthode de calcul (ISO 13789:2007)Wrmetechnisches
6、Verhalten von Gebuden - SpezifischerTransmissions- und Lftungswrmedurchgangskoeffizient -Berechnungsverfahren (ISO 13789:2007)This European Standard was approved by CEN on 7 December 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giv
7、ing this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versi
8、ons (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bu
9、lgaria, 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 STANDARDI
10、ZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 13789:2007: EBS EN ISO 13789:2007EN ISO 13789:2007 (E)
11、3 Foreword This document (EN ISO 13789:2007) 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 h
12、eld 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 June 2008, and conflicting national standards shall be withdrawn at the latest by June 2008. Attention is drawn to the possibility that
13、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 document supersedes EN ISO 13789:1999. According to the CEN/CENELEC Internal Regulations, the national standards organizatio
14、ns 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,
15、 Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 13789:2007 has been approved by CEN as a EN ISO 13789:2007 without any modification. BS EN ISO 13789:2007ISO 13789:2007(E) ISO 2007 All rights reserved iiiContents Page Foreword iv Introduction
16、 v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 2 4 Transmission heat transfer coefficient. 4 5 Ventilation heat transfer coefficient 7 6 Transmission heat transfer coefficient through unconditioned spaces. 7 7 Heat transfer to adjacent buildings. 8 8 Additional conventions 8 9 Re
17、port 10 Annex A (normative) Temperature in an unconditioned space. 11 Annex B (informative) Information on type of dimensions 12 Annex C (informative) Ventilation airflow rates. 14 Bibliography . 18 BS EN ISO 13789:2007ISO 13789:2007(E) iv ISO 2007 All rights reservedForeword ISO (the International
18、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 esta
19、blished 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 standardiza
20、tion. 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 votin
21、g. 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
22、patent rights. ISO 13789 was prepared by Technical Committee ISO/TC 163, Thermal performance and energy use in the built environment, Subcommittee SC 2, Calculation methods. This second edition cancels and replaces the first edition (ISO 13789:1999) which has been technically revised. A summary of t
23、he principal changes is given below. The title has been replaced by “Transmission and ventilation heat transfer coefficients ” This is because a ventilation coefficient has been added (see Clause 5) and “loss” is replaced by “transfer” to allow for cases of cooling. Consequential changes have also b
24、een made in the Introduction, Scope and elsewhere throughout this International Standard. In Clause 2, reference is to “ISO” rather than to “EN ISO” where applicable. ISO 10077-2 has been added. In 4.3, the text has been clarified and Note 1 added. 4.4 and 4.5 have been amended to say that heat tran
25、sfer to/from unheated spaces via the ground is disregarded. Clause 5 This is a new clause, taken unchanged from 7.3 of ISO 13790. The intention is that 7.3 of ISO 13790 should be deleted when that International Standard is revised and replaced by a reference to ISO 13789. Annex C is a new annex, tak
26、en unchanged from Annex G of ISO 13790. The intention is that Annex G of ISO 13790 should be deleted when that International Standard is revised. BS EN ISO 13789:2007ISO 13789:2007(E) ISO 2007 All rights reserved vIntroduction The aims of this International Standard are a) to clarify the internation
27、al market through the harmonized definition of intrinsic characteristics of buildings; b) to help in judging compliance with regulations; c) to provide input data for calculation of annual energy use for heating or cooling buildings. The result of the calculations can be used as input for calculatio
28、n of annual energy use and heating or cooling load of buildings, for expressing the thermal transmission and/or ventilation characteristics of a building or for judging compliance with specifications expressed in terms of transmission and/or ventilation heat transfer coefficients. This International
29、 Standard provides the means (in part) to assess the contribution that building products and services make to energy conservation and to the overall energy performance of buildings. BS EN ISO 13789:2007BS EN ISO 13789:2007INTERNATIONAL STANDARD ISO 13789:2007(E) ISO 2007 All rights reserved 1Thermal
30、 performance of buildings Transmission and ventilation heat transfer coefficients Calculation method 1 Scope This International Standard specifies a method and provides conventions for the calculation of the steady-state transmission and ventilation heat transfer coefficients of whole buildings and
31、parts of buildings. It is applicable both to heat loss (internal temperature higher than external temperature) and to heat gain (internal temperature lower than external temperature). For the purpose of this International Standard, the heated or cooled space is assumed to be at uniform temperature.
32、Annex A provides a steady-state method to calculate the temperature in unconditioned spaces adjacent to conditioned spaces. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For unda
33、ted references, the latest edition of the referenced document (including any amendments) applies. ISO 69461), Building components and building elements Thermal resistance and thermal transmittance Calculation method ISO 7345, Thermal insulation Physical quantities and definitions ISO 10077-1, Therma
34、l 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 102112), Thermal bridges in building construction Heat flows
35、and surface temperatures Detailed calculations ISO 133703), Thermal performance of buildings Heat transfer via the ground Calculation methods ISO 146834), Thermal bridges in building construction Linear thermal transmittance Simplified methods and default values EN 152425), Ventilation for buildings
36、 Calculation methods for the determination of air flow rates in buildings including infiltration 1) To be published (revision of ISO 6946:1996). 2) To be published (revision of ISO 10211-1:1995 and ISO 10211-2:2001). 3) To be published (revision of ISO 13370:1998). 4) To be published (revision of IS
37、O 14683:1999). 5) To be published. BS EN ISO 13789:2007ISO 13789:2007(E) 2 ISO 2007 All rights reserved3 Terms and definitions 3.1 Terms and definitions For the purposes of this document, the terms and definitions in ISO 7345 and the following apply. 3.1.1 heated space room or enclosure that, for th
38、e purposes of a calculation, is assumed to be heated to a given set-point temperature or set point temperatures 3.1.2 cooled space room or enclosure that, for the purposes of a calculation, is assumed to be cooled to a given set-point temperature or set-point temperatures 3.1.3 conditioned space hea
39、ted and/or cooled space NOTE The heated and/or cooled spaces are used to define the thermal envelope. 3.1.4 unconditioned space room or enclosure which is not part of a conditioned space 3.1.5 heat transfer coefficient heat flow rate divided by temperature difference between two environments; specif
40、ically used for heat transfer coefficient by transmission or ventilation 3.1.6 transmission heat transfer coefficient heat flow rate due to thermal transmission through the fabric of a building, divided by the difference between the environment temperatures on either side of the construction NOTE By
41、 convention, if the heat is transferred between a conditioned space and the external environment, the sign is positive if the heat flow is from the space to outside (heat loss). 3.1.7 ventilation heat transfer coefficient heat flow rate due to air entering a conditioned space either by infiltration
42、or ventilation, divided by the temperature difference between the internal air and the supply air temperature NOTE The supply temperature for infiltration is equal to the external temperature. 3.1.8 building heat transfer coefficient sum of transmission and ventilation heat transfer coefficients 3.1
43、.9 internal dimension dimension measured from wall to wall and floor to ceiling inside a room of a building NOTE See Figure 1. BS EN ISO 13789:2007ISO 13789:2007(E) ISO 2007 All rights reserved 33.1.10 overall internal dimension dimension measured on the interior of a building, ignoring internal par
44、titions NOTE See Figure 1. 3.1.11 external dimension dimension measured on the exterior of a building NOTE See Figure 1. Key 1 internal dimension 2 overall internal dimension 3 external dimension Figure 1 Dimension systems 3.2 Symbols and units Symbol Quantity Unit A Area m2b Adjustment factor for h
45、eat transfer coefficient cpSpecific heat capacity of air at constant pressure Wh/(kgK) H Heat transfer coefficient W/K U Thermal transmittance W/(m2K) VVolumetric air flow rate m3/h l Length mn Air change rate h1 Density kg/m3 Linear thermal transmittance W/(mK) Point thermal transmittance W/K BS EN
46、 ISO 13789:2007ISO 13789:2007(E) 4 ISO 2007 All rights reserved4 Transmission heat transfer coefficient 4.1 Basic equation The transmission heat transfer coefficient, HT, is calculated according to Equation (1): TDgUAH HHHH=+ (1) where HDis the direct heat transfer coefficient between the heated or
47、cooled space and the exterior through the building envelope, defined by Equation (2), in W/K; Hgis the steady-state ground heat transfer coefficient defined in 4.4, in W/K; HUis the transmission heat transfer coefficient through unconditioned spaces defined in Equation (5), in W/K; HAis the transmis
48、sion heat transfer coefficient to adjacent buildings, determined according to Clause 7, in W/K. ISO 10211 gives a general procedure for the calculation of the total thermal coupling coefficient of the complete envelope or any part of it, including ground heat transfer. Where no unconditioned space i
49、s involved, the total thermal coupling coefficient corresponds to the transmission heat transfer coefficient as defined in this International Standard. NOTE In some applications the heat transfer via the ground is treated in terms of a constant part related to the annual average temperature difference and a varying part related to the monthly variations of internal and external temperature difference. 4.2 Boundaries of conditioned space Before calculation, the conditioned space o
