BS-8206-2-2008.pdf
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1、BS 8206-2:2008 Lighting for buildings Part 2: Code of practice for daylighting ICS 91.060.50; 91.160.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Publishing and copyright information The BSI copyright notice displayed in this document indicates when the
2、document was last issued. BSI 2008 ISBN 978 0 580 57793 2 The following BSI references relate to the work on this standard: Committee reference CPL/34/10 Draft for comment 07/30157086 DC Publication history First published June 1992 Second edition, September 2008 Amendments issued since publication
3、Amd. no.DateText affected BS 8206-2:2008 BSI 2008i BS 8206-2:2008 Contents Foreword iii Section 1: General 1 1 Scope 1 2 Terms and definitions 1 Section 2: Aims and criteria for design 4 3 The contribution of daylight 4 4 Windows and view 5 5 Daylight and room brightness 8 6 Daylight for task lighti
4、ng 11 Section 3: Further design issues 14 7 Electric lighting used in conjunction with daylight 14 8 Sunlight shading 16 9 Energy efficiency 18 10 Conservation of materials inside buildings 20 11 Statutory and legal requirements affecting the provision of daylight 21 Section 4: Methods of calculatio
5、n 23 12 Sunlight 23 13 Calculation of average daylight factor 29 14 Calculation of daylight illuminance 31 15 Examples of the calculation of window transmittance 32 Annexes Annex A (informative) Data for daylight and sunlight calculations 33 Annex B (informative) Climate-based daylight modelling 40
6、Bibliography 44 List of figures Figure 1 Solar altitude and solar azimuth 3 Figure 2 Views from windows of different shapes and sizes 7 Figure 3 Window reveal drawn on a sunpath diagram for London 26 Figure 4 Obstructing building superimposed on the sunpath diagram 27 Figure 5 Use of sunlight probab
7、ility diagram to determine sunlight reaching window reference point 27 Figure 6 Angle of visible sky used in calculating average daylight factor 30 Figure 7 Limiting depth of a side-lit room 31 Figure A.1 Sunpath diagram for London (latitude 51 N) 36 Figure A.2 Sunpath diagram for Edinburgh (latitud
8、e 56 N) 37 Figure A.3 Sunlight probability diagram 38 Figure A.4 Diffuse illuminance (Eh) availability for London 39 Figure A.5 Diffuse illuminance (Eh) availability for Edinburgh 39 Figure A.6 Mean horizontal diffuse illuminances at London (Kew) 40 List of tables Table 1 Minimum glazed areas for vi
9、ew when windows are restricted to one wall 6 Table 2 Minimum average daylight factor 10 Table A.1 Approximate values of the reflectance of light 33 Table A.2 Mean light transmittance of glazing materials 34 BS 8206-2:2008 ii BSI 2008 Table A.3 Percentage losses of light in particular types of buildi
10、ngs 35 Table A.4 Exposure multiplying factors 35 Table A.5 Special exposure multiplying factors 35 Table A.6 Correction factors for frames and glazing bars 36 Table A.7 Diffuse orientation factors for an 09.00 to 17.00 working day 38 Summary of pages This document comprises a front cover, an inside
11、front cover, pages i to iv, pages 1 to 48, an inside back cover and a back cover. BSI 2008iii BS 8206-2:2008 Foreword Publishing information This part of BS 8206 is published by BSI and came into effect on 30 September 2008. It was prepared by Subcommittee CPL/34/10, Light and lighting, under the au
12、thority of Technical Committee CPL/34, Lamps and related equipment. A list of organizations represented on this committee can be obtained on request to its secretary. Supersession This part of BS 8206 supersedes BS 8206-2:1992, which is withdrawn. Information about this document This part of BS 8206
13、 represents a full revision of the standard. This revision has been prepared to take account of the publication of BS EN 12464-1 and BS EN 15193. In particular, some of the manual calculations that appeared in the 1992 edition have been omitted and a new annex on climate-based daylight modelling has
14、 been added. There is also a new clause on daylighting and health. Annex B in the 1992 edition gave what was termed “service illuminances” for tasks. Task lighting is now specified in BS EN 12464-1 and this annex, therefore, has been deleted. The standard describes good practice in daylighting desig
15、n and presents criteria intended to enhance the well-being and satisfaction of people in buildings, recognizing that the aims of good lighting go beyond achieving minimum illumination for task performance. Simple graphical and numerical methods are given for testing whether the criteria are satisfie
16、d, but these are not exclusive and computer methods may be used in practice. Sunlight and skylight data are given. The aim of the standard is to give guidance to architects, engineers, builders and others who carry out lighting design. It is recognized that lighting is only one of many matters that
17、influence fenestration. These include other aspects of environmental performance (such as noise, thermal equilibrium and the control of energy use) fire hazards, constructional requirements, the external appearance and the surroundings of the site. The best design for a building does not necessarily
18、 incorporate the ideal solution for any individual function. For this reason, careful judgement needs to be exercised when using the criteria given in the standard for other purposes, particularly town planning control. NOTEFigure 2 in this standard is reproduced from the CIBSE Lighting Guide LG10 D
19、aylighting and window design 1 by permission of the Chartered Institution of Building Services Engineers. BS 8206-2:2008 iv BSI 2008 Use of this document As a code of practice, this part of BS 8206 takes the form of guidance and recommendations. It should not be quoted as if it were a specification
20、and particular care should be taken to ensure that claims of compliance are not misleading. Any user claiming compliance with this part of BS 8206 is expected to be able to justify any course of action that deviates from its recommendations. Presentational conventions The provisions in this standard
21、 are presented in roman (i.e. upright) type. Its recommendations are expressed in sentences in which the principal auxiliary verb is “should”. Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative element. Contractual and le
22、gal considerations This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. BSI 20081 BS 8206-2:2008 Section 1: General 1 Scope This pa
23、rt of BS 8206 gives recommendations regarding design for daylight in buildings. It includes recommendations on the design of electric lighting when used in conjunction with daylight. NOTEData for daylight and sunlight calculations are given in Annex A. 2 Terms and definitions For the purposes of thi
24、s part of BS 8206, the following terms and definitions apply. 2.1daylight visible part of global solar radiation BS EN 12665:2002 NOTEDaylight consists of a combination of sunlight (see 2.10.1) and skylight (see 2.11.1). 2.2window construction for closing a vertical or near-vertical opening in a wal
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