1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58ICS 81.040.20Glazing for buildings Part 2: Code of practice for energy, light and soundBRITISH STAN
2、DARDBS 6262-2:2005BS 6262-2:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 14 October 2005 BSI 14 October 2005First published as BS 973, 1941Second edition 1945Third edition, as CP 152, January 1960Fourth edition, August 1966Fifth editio
3、n, July 1972Sixth edition, as BS 6262, June 1982Seventh edition, as BS 6262-2, October 2005The following BSI references relate to the work on this British Standard:Committee reference B/520/4Draft for comment 97/102384 DCISBN 0 580 46775 9British Plastics FederationBritish Woodworking FederationCons
4、umer Policy Committee of BSICouncil for Aluminium in BuildingFlat Glass Manufacturers AssociationGlass and Glazing FederationNottingham UniversityOffice of the Deputy Prime Minister Building DivisionOffice of the Deputy Prime Minister represented by the BRERICS Building Control ForumCo-opted members
5、Amendments issued since publicationAmd. No. Date CommentsCommittees responsible for this British StandardThe preparation of this British Standard was entrusted by Technical Committee B/520, Glass and glazing in building, to Subcommittee B/520/4, Properties and glazing methods, upon which the followi
6、ng bodies were represented:British Adhesives and Sealants AssociationBS 6262-2:2005 BSI 14 October 2005ContentsPageCommittees responsible Inside front coverForeword ii1Scope 12 Normative references 13 Terms and definitions 14Energy 25Light 156 Sound 18Annex A (informative) Design skies 24Bibliograph
7、y 25Figure 1 Performance of different glass products showing the relationship between light transmission and total solar energy transmission 4Table 1 Properties of a typical range of clear and body-tinted glass products 5Table 2 Properties of a typical range of clear glass and reflective coated glas
8、s products 6Table 3 Properties of a typical range of laminated glass products with clear and tinted interlayers and clear glass 6Table 4 Properties of a typical range of insulating glass units with clear float inner pane 8Table 5 Properties of a typical range of insulating glass units with hard coat
9、 low emissivity inner pane 9Table 6 Properties of a typical range of insulating glass units with soft coat low emissivity inner pane 10Table 7 Thermal transmittance (U value) of glass products: Single glazing 11Table 8 Thermal transmittance (U value) of glass products: Insulating glass units 12Table
10、 9 Thermal transmittance (U value) of glass products: Coupled glazing 12Table 10 Thermal transmittance (U value) of single and double plastics glazing sheet materials 13Table 11 Light transmission correction factors 15Table 12 Typical sound reduction properties of single glazing 21Table 13 Typical s
11、ound reduction properties of insulating glass units and secondary glazing 22Table 14 Sound reduction: Single plastics glazing sheet material 23Table 15 Sound reduction: Double glazing, both panels the same thickness of plastics glazing sheet material 23iBS 6262-2:2005iiB/520/4, Properties and glazin
12、g methods. It partially supersedes BS 6262:1982, which will be withdrawn upon publication of all seven parts of the newly revised and restructured BS 6262. BS 6262:1982 is being revised and restructured to simplify its use and will be published in seven parts: Part 1: General methodology for the sel
13、ection of glazing; Part 2: Code of practice for energy, light and sound; Part 3: Code of practice for fire, security and wind loading; Part 4: Code of practice for safety related to human impact; Part 5: Code of practice for frame design considerations; Part 6: Code of practice for special applicati
14、ons; Part 7: Code of practice for provision of information.Requirements for standards of workmanship for glazing have been published separately as BS 8000-7 and therefore this subject is not dealt with in this standard.Since the correct selection of materials to be used in glazing for buildings depe
15、nds on many factors, the recommendations in this part of the standard should be used in conjunction with those in the other parts.As a code of practice, this British Standard takes the form of guidance and recommendations. It should not be quoted as if it were a specification and particular care sho
16、uld be taken to ensure that claims of compliance are not misleading.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 does not of itself confer immunity from legal obligations.
17、Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 25 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.ForewordThis part of BS 6262 has been prepared under the direction of Subcommit
18、tee BSI 14 October 2005BS 6262-2:20051 ScopeThis part of BS 6262 gives information and recommendations for vertical glazing in the external walls and interiors of buildings, with respect to their effect on the energy, light and sound environments in the building.These recommendations do not apply to
19、:a) patent glazing (see BS 5516-1);b) glass in non-vertical applications (see BS 5516-2);c) glazing for furniture and fittings (see BS 7376 and BS 7449);d) glazing for commercial greenhouses (see BS 5502-21);e) glazing for domestic greenhouses.Requirements for standards of workmanship for glazing ha
20、ve been published separately as BS 8000-7 and therefore this subject is not dealt with in this standard.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the l
21、atest edition of the referenced document (including any amendments) applies.BS EN ISO 140-3, Acoustics Measurement of sound insulation in buildings and of building elements Part 3: Laboratory measurement of airborne sound insulation of building elements.BS EN ISO 717-1, Acoustics Rating of sound ins
22、ulation in buildings and of building elements Part 1: Airborne sound insulation.BS EN ISO 717-2, Acoustics Rating of sound insulation in buildings and of building elements Part 2: Impact sound insulation.3 Terms and definitionsFor the purposes of this part of BS 6262, the following terms and definit
23、ions apply.3.1 glazing (noun)glass or plastics glazing sheet material, for installation into a building3.2 glazing (verb)action of installing glass, or plastics glazing sheet material, into a building3.3 insulating glass unitan assembly consisting of at least two panes of glass, separated by one or
24、more spaces, hermetically sealed along the periphery, mechanically stable and durable BS EN 1279-1:2004, definition 3.1NOTE The individual panes may be of different sizes and/or thicknesses.3.4 coupled glazingtwo panes of glazing spaced apart in an opening, either in the frame or glazed separately,
25、to form an unsealed cavityNOTE Coupled glazing is also known as secondary glazing. BSI 14 October 200513.5 panesingle piece of glass or plastics glazing sheet material, in a finished size ready for glazingBS 6262-2:20053.6 plastics glazing sheet materialplastics material in the form of a single shee
26、t, or a combination of sheets laminated together, or an extruded multi-wall sheet3.7 vertical glazingglazing which is vertical, or within 15 of vertical3.8 task lightinglighting sufficient to enable tasks to be performedNOTE Tasks include reading, machine operating, component assembly, etc.3.9 ameni
27、ty lightinglighting for the appearance of an interior and its contents3.10 passive solar gainsolar radiation in the form of energy and light which is transmitted through the glazing into the building and which can be utilized as a source of energy or to reduce the need for artificial lighting4 Energ
28、y4.1 GeneralGlazed areas in buildings should be designed so that account is taken of the overall energy balance in relation to the effects on the thermal comfort of occupants and the total annual energy implications of solar gain and energy loss.These should be examined separately, since factors aff
29、ecting one aspect of performance might have no effect on the other. Energy gain is due to transmission of solar radiant energy through the glass into the building. Solar energy is all at relatively short wavelengths and is controlled by using the glass to absorb or reflect the energy. Energy loss is
30、 due to the transfer of energy by conduction, convection and long wavelength radiation and can be influenced by a number of factors, e.g. incorporating air cavities, including gases of low thermal conductivity and/or low emissivity glass.4.2 Thermal comfortEnergy transmission through glazing can sig
31、nificantly influence occupier comfort by raising or lowering room air temperatures. For example, hot sunny weather can give rise to excessive energy gains; and energy losses can occur through the glazing during cold weather or at night. Thermal comfort can also be influenced by direct radiation thro
32、ugh the glazing and/or by radiation exchange between the glazing and the occupants.4.3 Solar energy gainFactors that can influence the amount of solar gain through the glazing include:a) orientation;b) glazed area;c) shading devices, both internal and external;d) properties of the glazing.4.4 Total
33、solar energy transmittance4.4.1 General2 BSI 14 October 2005Total solar energy transmittance is the proportion of solar radiation at normal incidence transferred through the glazing. It is composed of the direct transmittance (short wave component) and the part of the solar absorptance dissipated in
34、wards by long wave radiation and convection (long wave component).BS 6262-2:2005The total solar energy transmission properties of solar control glazings can be described by their shading coefficients. The shading coefficient is derived by comparing the properties of the solar control glazing with a
35、clear float glass having a total solar energy transmittance of 0.87 (i.e. clear glass between 3 mm and 4 mm thick).NOTE Total solar energy transmittance is also known as g value.4.4.2 Solar control glass4.4.2.1 GeneralSolar control glass can be manufactured in several forms (see 4.4.2.2, 4.4.2.3 and
36、 4.4.2.4). The function of solar control glass is to reduce the total solar energy transmittance, which usually leads to a decrease in the transmission of the visible part of the solar spectrum. However some tints and coatings are able to attenuate preferentially non-visible solar radiation, leaving
37、 the transmission of the greater proportion of the visible radiation largely unchanged.The application of ceramic frit fired into the surface of the glass can also be used to modify the energy and light transmission of the glass. The effect can be varied across a pane depending on the screen print p
38、attern. The manufacturers should be consulted for specific details.The relationship between light transmission and total solar energy transmission is referred to as the light/energy ratio. Some manufacturers use this as a descriptive code, quoting a light transmission figure followed by a total sola
39、r energy transmission figure.NOTE The performance of typical glass products showing the relationship between light transmission and total solar energy transmission is illustrated in Figure 1 (the enclosed area represents the envelope enclosing most practically available architectural glass products)
40、.There is no optimum light/energy ratio. The selection of an appropriate product depends on the requirements of the building. Solar gain may be relatively high, for making use of passive solar gains, or low, to reduce air-conditioning loads. Light transmission will depend on the extent to which dayl
41、ight is used to obviate artificial lighting.4.4.2.2 Body tinted glass (increased absorption)Solar control properties and colour vary with the thickness of the glass. When used in insulating glass units, body tinted glass should be positioned as the outer pane because the energy due to the absorbed r
42、adiation is more easily dissipated to the outside. NOTE Performances of a typical range of body tinted glass products are shown in Table 1, with the properties of clear float for comparison.4.4.2.3 Reflective coated glassReflective coated glass uses the principle of increasing the direct reflection
43、to maximize solar energy attenuation. In comparison with clear glass its absorption of solar energy is also increased.NOTE 1 Compared with a float glass surface, these reflecting coatings (owing to their composition) exhibit lower levels of emissivity which improves their U value.The advantages of s
44、uch glass types are:a) greater performance range than body tinted glass;b) higher performances (greater solar energy attenuation);c) light/energy ratios nearer to the theoretical limit;d) a range of colour appearances in transmission and reflection.NOTE 2 Performance data in comparison to clear glas
45、s is shown in Table 2.The coatings may be placed on to body-tinted glass to extend the range of performances. BSI 14 October 20053BS 6262-2:2005Key1 Theoretical limit 2 Clear float glass3 Tinted float glass4 Coated glass5 High performance coated glassFigure 1 Performance of different glass products
46、showing the relationship between light transmission and total solar energy transmission10090807060504030201000 1020304050601234570 80 90 100Light transmission %Total solar energy transmission %4 BSI 14 October 2005BS 6262-2:2005 BSI 14 October 20055Glass Shading coefficientsShort waveLong waveTotal4
47、 mm 0.94 0.04 0.984 mm 0.67 0.11 0.784 mm 0.67 0.11 0.784 mm 0.63 0.12 0.756 mm 0.90 0.04 0.946 mm 0.53 0.14 0.676 mm 0.53 0.14 0.676 mm 0.53 0.14 0.676 mm 0.48 0.16 0.6410 mm 0.80 0.07 0.8710 mm 0.33 0.20 0.5310 mm 0.33 0.20 0.5310 mm 0.29 0.21 0.50Table 1 Properties of a typical range of clear and
48、 body-tinted glass productstype and thicknessLight Solar energyTransmittance Reflectance DirecttransmittanceReflectance Absorptance Totaltransmittanceclear 0.89 0.08 0.82 0.07 0.11 0.85green 0.78 0.07 0.58 0.05 0.37 0.68bronze 0.61 0.06 0.58 0.05 0.37 0.68grey 0.55 0.05 0.55 0.05 0.40 0.65clear 0.87
49、 0.08 0.78 0.07 0.15 0.82green 0.72 0.06 0.46 0.05 0.49 0.59blue 0.54 0.05 0.46 0.05 0.49 0.59bronze 0.50 0.05 0.46 0.05 0.49 0.59grey 0.42 0.05 0.42 0.05 0.53 0.56clear 0.84 0.07 0.70 0.07 0.23 0.76green 0.61 0.06 0.29 0.04 0.67 0.46bronze 0.33 0.04 0.29 0.04 0.67 0.46grey 0.25 0.04 0.25 0.04 0.71 0.43BS 6262-2:20056Table 2 Properties of a typical range of clear glass and reflective coated glass productsShading coefficientsTotalmittanceShort waveLong waveTotal0.90 0.04 0.940.33
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