BS EN ISO 11079-2007 Ergonomics of the thermal environment - Determination and interpretation of cold stress when using required clothing insulation (IREQ) and local cooling effect.pdf

1、BRITISH STANDARDBS EN ISO 11079:2007Ergonomics of the thermal environment Determination and interpretation of cold stress when using required clothing insulation (IREQ) and local cooling effectsICS 13.180g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g

2、3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 11079:2007This B

3、ritish Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2008 BSI 2008ISBN 978 0 580 54566 5National forewordThis British Standard is the UK implementation of EN ISO 11079:2007. It supersedes DD ENV ISO 11079:1999 which is withdrawn.The UK partic

4、ipation in its preparation was entrusted by Technical Committee PH/9, Applied ergonomics, to Subcommittee PH/9/1, Thermal environments.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 prov

5、isions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsCopyright European Committee for Standardization Provided by IHS under license with CENN

6、ot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 11079December 2007ICS 13.180 Supersedes ENV ISO 11079:1998 English VersionErgonomics of the thermal environment - Determination andinterpretation of cold stress whe

7、n using required clothinginsulation (IREQ) and local cooling effects (ISO 11079:2007)Ergonomie des ambiances thermiques - Dtermination etinterprtation de la contrainte lie au froid en utilisantlisolement thermique requis du vtement (IREQ) et leseffets du refroidissement local (ISO 11079:2007)Ergonom

8、ie der thermischen Umgebung - Bestimmung undInterpretation der Kltebelastung bei Verwendung dererforderlichen Isolation der Bekleidung (IREQ) und lokalenKhlwirkungen (ISO 11079:2007)This European Standard was approved by CEN on 14 December 2007.CEN members are bound to comply with the CEN/CENELEC In

9、ternal Regulations which stipulate the conditions for giving 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 mem

10、ber.This European Standard exists in three official versions (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

11、are the national standards bodies of 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, Slovakia, Slovenia, Spain, Sweden, Switze

12、rland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT 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 IS

13、O 11079:2007: ECopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Foreword This document (EN ISO 11079:2007) has been prepared by Technical Committee ISO/TC 159 “Ergonomics“ in coll

14、aboration with Technical Committee CEN/TC 122 “Ergonomics” the secretariat of which is held by DIN. 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 sh

15、all be withdrawn at the latest by June 2008. 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 document supersedes ENV ISO 11079:19

16、98. 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Ita

17、ly, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 11079:2007 has been approved by CEN as a EN ISO 11079:2007 without any modification. BS EN ISO 11079:200

18、7Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Reference numberISO 11079:2007(E)INTERNATIONAL STANDARD ISO11079First edition2007-12-15Ergonomics of the thermal environment Dete

19、rmination and interpretation of cold stress when using required clothing insulation (IREQ) and local cooling effects Ergonomie des ambiances thermiques Dtermination et interprtation de la contrainte lie au froid en utilisant lisolement thermique requis du vtement (IREQ) et les effets du refroidissem

20、ent local BS EN ISO 11079:2007Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ii Copyright European Committee for Standardization Provided by IHS under license with CENNot for Re

21、saleNo reproduction or networking permitted without license from IHS-,-,-iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms, definitions and symbols 2 4 Principles of methods for evaluation 4 5 General cooling. 4 6 Local cooling. 10 7 Practical assessment of c

22、old environments and interpretation 11 Annex A (normative) Computation of thermal balance 13 Annex B (informative) Physiological criteria in cold exposure . 16 Annex C (informative) Metabolic rate and thermal properties of clothing . 18 Annex D (informative) Determination of wind cooling . 21 Annex

23、E (informative) Examples of evaluation of IREQ . 23 Annex F (informative) Computer program for calculating IREQ . 33 Bibliography . 34 BS EN ISO 11079:2007Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted with

24、out license from IHS-,-,-iv Foreword ISO (the International 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 intereste

25、d in a subject for which a technical committee has been established 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 Com

26、mission (IEC) on all matters of electrotechnical standardization. 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 techni

27、cal committees are circulated to the member bodies for voting. 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 sh

28、all not be held responsible for identifying any or all such patent rights. ISO 11079 was prepared by Technical Committee ISO/TC 159, Ergonomics, Subcommittee SC 5, Ergonomics of the physical environment. This first edition of ISO 11079 cancels and replaces the ISO/TR 11079:1993, of which it constitu

29、tes a technical revision. BS EN ISO 11079:2007Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-vIntroduction Wind chill is commonly encountered in cold climates, but it is low tem

30、peratures that first of all endanger body heat balance. By proper adjustment of clothing, human beings can often control and regulate body heat loss, to balance a change in the ambient climate. The method presented here is based therefore on the evaluation of the clothing insulation required to main

31、tain the thermal balance of the body in equilibrium. The heat balance equation used takes into account the most recent scientific findings concerning heat exchanges at the surface of the skin as well as the clothing. BS EN ISO 11079:2007Copyright European Committee for Standardization Provided by IH

32、S under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-blankCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1Ergonomics of the

33、 thermal environment Determination and interpretation of cold stress when using required clothing insulation (IREQ) and local cooling effects 1 Scope This International Standard specifies methods and strategies for assessing the thermal stress associated with exposure to cold environments. These met

34、hods apply to continuous, intermittent as well as occasional exposure and type of work, indoors and outdoors. They are not applicable to specific effects associated with certain meteorological phenomena (e.g. precipitation), which are assessed by other methods. 2 Normative references The following r

35、eferenced documents 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 7726, Ergonomics of the thermal environment Instruments for

36、measuring physical quantities ISO 8996, Ergonomics of the thermal environment Determination of metabolic rate ISO 9237, Textiles Determination of permeability of fabrics to air ISO 9920, Ergonomics of the thermal environment Estimation of thermal insulation and water vapour resistance of a clothing

37、ensemble ISO 13731, Ergonomics of the thermal environment Vocabulary and symbols ISO 13732-3, Ergonomics of the thermal environment Methods for the assessment of human responses to contact with surfaces Part 3: Cold surfaces ISO 15831, Clothing Physiological effects Measurement of thermal insulation

38、 by means of a thermal manikin EN 511, Protective gloves against cold BS EN ISO 11079:2007Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2 3 Terms, definitions and symbols For t

39、he purposes of this document, the terms and definitions given in ISO 13731 and the following terms, definitions and symbols apply. 3.1 Terms and definitions 3.1.1 cold stress climatic conditions under which the body heat exchange is just equal to or too large for heat balance at the expense of signi

40、ficant and sometimes uncompensable physiological strain (heat debt) 3.1.2 heat stress climatic conditions under which the body heat exchange is just equal to or too small for heat balance at the expense of significant and sometimes uncompensable physiological strain (heat storage) 3.1.3 IREQ require

41、d clothing insulation for the preservation of body heat balance at defined levels of physiological strain 3.1.4 thermoneutral zone temperature interval within which the body maintains heat balance exclusively by vasomotor reactions 3.1.5 wind chill temperature temperature related to the cooling effe

42、ct on a local skin segment 3.2 Symbols ADuDubois body surface area, m2ap air permeability, l m-2 s1C convective heat flow (exchange), W m2cewater latent heat of vaporization, J kg1cpspecific heat of dry air at constant pressure, J kg1 K1Cresrespiratory convective heat flow (loss), W m2Dlimduration l

43、imited exposure, h Drecrecovery time, h E evaporative heat flow (exchange) at the skin, W m2Eresrespiratory evaporative heat flow (loss), W m2fclclothing area factor, dimensionless hcconvective heat transfer coefficient, W m2 K1hrradiative heat transfer coefficient, W m2 K1Iaboundary layer thermal i

44、nsulation, m2 K W1Ia,rresultant boundary layer thermal insulation, m2 K W1BS EN ISO 11079:2007Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3Iclbasic clothing insulation, m2 K

45、W1Icl,rresultant clothing insulation, m2 K W1ITbasic total insulation, m2 K W1IT,rresultant total insulation, m2 K W1immoisture permeability index, dimensionless IREQ required clothing insulation, m2 K W1IREQminminimal required clothing insulation, m2 K W1IREQneutralneutral required clothing insulat

46、ion, m2 K W1K conductive heat flow (exchange), W m2M metabolic rate, W m2pawater vapour partial pressure, kPa pexsaturated water vapour pressure at expired air temperature, kPa pskwater vapour pressure at skin temperature, kPa psk,s saturated water vapour pressure at the skin surface, kPa Q body hea

47、t gain or loss, kJ m2Qlimlimit value for Q, kJ m2R radiative heat flow (exchange), W m2Re,Ttotal evaporative resistance of clothing and boundary air layer, m2 kPa W1S body heat storage rate, W m2taair temperature, C tclclothing surface temperature, C texexpired air temperature, C tooperative tempera

48、ture, C trradiant temperature tsklocal skin temperature, C skt mean skin temperature, C tWCwind chill temperature, C V respiratory ventilation rate, kg air s1v10wind speed measured 10 m above ground level, m s1vaair velocity, m s1vwwalking speed, m s1W effective mechanical power, W m2w skin wettedness, dimensionless BS EN ISO 11079:2007Copyright European Committee for Standardization