07-30157086-DC.pdf
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1、a Date: 3 July 2007 Origin: National Latest date for receipt of comments: 31 August 2007 Project no.: 2006/02730 Responsible committee: CPL/34/10 Light and lighting Interested committees: CPL/34, B/559/2, B/559/2/-/1 Title: Draft BS 8206-2 Lighting for buildings Part 2: Code of practice for daylight
2、ing Supersession information: If this document is published as a standard, the UK implementation of it will supersede BS8206 PT2 : 1992 and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (contact details below). WARNING: T
3、HIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 31 August 2007. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement will normally be sent. See overlea
4、f for information on commenting. No copying is allowed, in any form, without prior written permission from BSI except as permitted under the Copyright, Designs and Patent Act 1988 or for circulation within a nominating organization for briefing purposes. Electronic circulation is limited to dissemin
5、ation by e-mail within such an organization by committee members. Further copies of this draft may be purchased from BSI Customer Services, Tel: +44(0) 20 8996 9001 or email ordersbsi-. British, International and foreign standards are also available from BSI Customer Services. British Standards on C
6、D or Online are available from British Standards Publishing Sales Limited. Tel: 01344 404409 or email bsonlinetechindex.co.uk. Information on the co-operating organizations represented on the committees referenced above may be obtained from the responsible committee secretary. Cross-references The B
7、ritish Standards which implement International or European publications referred to in this draft may be found via the British Standards Online Service on the BSI web site http:/www.bsi-. Direct tel: 020 8996 7762 Responsible Committee Secretary: Ms. C.A. Kraft (BSI) E-mail: cathy.kraftbsi- Draft fo
8、r Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 7.0 DPC: 07/30157086 DC Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:20:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSI b
9、Introduction Your comments on this draft are welcome and will assist in the preparation of the consequent British Standard. If no comments are received to the contrary, this draft may be implemented unchanged as a British Standard. Submission The guidance given below is intended to ensure that all c
10、omments receive efficient and appropriate attention by the responsible BSI committee. Annotated drafts are not acceptable and will be rejected. All comments must be submitted, preferably electronically, to the Responsible Committee Secretary at the address given on the front cover. Comments should b
11、e compatible with Version 6.0 or Version 97 of Microsoft Word for Windows, if possible; otherwise comments in ASCII text format are acceptable. Any comments not submitted electronically should still adhere to these format requirements. All comments submitted should be presented as given in the examp
12、le below. Further information on submitting comments and how to obtain a blank electronic version of a comment form are available from the BSI web site at: http:/www.bsi- Date: xx/xx/200x Document: ISO/DIS xxxxx 1 2 (3) 4 5 (6) (7) MB Clause No./ Subclause No./ Annex (e.g. 3.1) Paragraph/ Figure/Tab
13、le/ Note (e.g. Table 1) Type of com- ment Comment (justification for change) by the MB Proposed change by the MB Secretariat observations on each comment submitted 3.1 Definition 1 ed Definition is ambiguous and needs clarifying. Amend to read . so that the mains connector to which no connection . 6
14、.4 Paragraph 2 te The use of the UV photometer as an alternative cannot be supported as serious problems have been encountered in its use in the UK. Delete reference to UV photometer. Microsoft and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Corporation. Licensed Copy:
15、London South Bank University, London South Bank University, Mon Jul 16 04:20:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 8206-2:2007 1 BS 8206-2 dpc Lighting for buildings Part 2: Code of practice for daylighting Licensed Copy: London South Bank University, London South Bank University, Mon Jul
16、 16 04:20:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 8206-2:2007 2 BS 8206-2 dpc Contents Foreword 4 Section 1: General 5 1 Scope 5 2 Terms and definitions 5 Section 2: Aims and criteria for design 8 3 The contribution of daylight 8 4 Windows and view 8 5 Daylight and room brightness 12 6 Dayl
17、ight for task lighting 15 Section 3: Further design issues 17 7 Electric lighting used in conjunction with daylight 17 8 Sunlight shading 19 9 Energy efficiency 20 10 Conservation of materials inside buildings 22 11 Statutory requirements affecting the provision of daylight 23 Section 4: Methods of
18、calculation 24 12 Sunlight 24 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 mod
19、elling 44 Bibliography 49 List of figures Figure 1 Views 10 Figure 2 Window reveal drawn on a sunpath diagram for London 26 Figure 3 Obstructing building superimposed on the sunpath diagram 27 Figure 4 Use of sunlight probability diagram to determine sunlight reaching window reference point 28 Figur
20、e 5 Angle of visible sky used in calculating average daylight factor 30 Figure 6 Limiting depth of a side-lit room 31 Figure A.1 Sunpath diagram for London (latitude 51 N) 38 Figure A.2 Sunpath diagram for Edinburgh (latitude 56 N) 39 Figure A.3 Sunlight probability diagram 40 Figure A.4 Diffuse ill
21、uminance (Eh) availability for London (see 14.1 for factor Eh in equation 3) 41 Figure A.5 Diffuse illuminance (Eh) availability for Edinburgh (see Clause 14 for factor Eh in equation 3) 42 Figure A.6 Mean horizontal diffuse illuminances at London (Kew) 43 Licensed Copy: London South Bank University
22、, London South Bank University, Mon Jul 16 04:20:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 8206-2:2007 3 BS 8206-2 dpc List of tables Table 1 Minimum glazed areas for view when windows are restricted to one wall 12 Table A.1 Approximate values of the reflectance of light 34 Table A.2 Mean lig
23、ht transmittance of glazing materials 35 Table A.3 Percentage losses of light in particular types of buildings 36 Table A.4 Exposure multiplying factors 36 Table A.5 Special exposure multiplying factors 36 Table A.6 Correction factors for frames and glazing bars 37 Table A.7 Diffuse orientation fact
24、ors for an 09.00 to 17.00 working day (factor fo in equation 3 in Clause 14) 41 Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:20:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 8206-2:2007 4 BS 8206-2 dpc Foreword Publishing information This Part of BS 820
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