BS EN 14500:2008

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Notations used
  4.1 General
  4.2 Visual or solar properties
  4.3 Geometry of the radiation
  4.4 Optical factors
5 Test and calculation methods to be used according
  to product - Guidelines
  5.1 General
  5.2 Venetian blinds
  5.3 Roller blinds
  5.4 Pleated blinds
  5.5 Projecting awnings
  5.6 Vertical blinds
  5.7 Shutters
6 Measurement set-up
  6.1 Measurement principles
      6.1.1 Spectral and integral characteristics
      6.1.2 Absolute and relative methods
            (according to CIE 130)
  6.2 Measuring equipment
      6.2.1 General
      6.2.2 Equipment for irradiation
      6.2.3 Equipment for detection
      6.2.4 Reference samples
  6.3 Test samples
      6.3.1 General
      6.3.2 Thick translucent samples
7 Measurement procedure
  7.1 General
  7.2 Test method A - Single beam instrument
      (substitution method)
      7.2.1 General
      7.2.2 Test apparatus for the substitution method
      7.2.3 Direct-hemispherical transmittance mode
      7.2.4 Direct-hemispherical reflectance mode
      7.2.5 Diffuse-hemispherical transmittance mode
  7.3 Test method B - Double beam spectrophotometer
      (comparison method)
      7.3.1 General
      7.3.2 Spectral direct-hemispherical transmittance
            mode
      7.3.3 Spectral direct-diffuse transmittance mode
      7.3.4 Direct-hemispherical reflectance mode
  7.4 Determination of tau[n-h] and rho[n-h]
  7.5 Determination of tau[n-n]
      7.5.1 General
      7.5.2 Measurement of tau[n-n]
      7.5.3 Determination of tau[n-n] from the measurement
            of tau[n-dif]
  7.6 Determination of tau[dif-h]
      7.6.1 General
      7.6.2 Measurement
      7.6.3 Calculation
  7.7 Determination of opacity characteristics for dim-out
      and black out fabrics or products
      7.7.1 General
      7.7.2 Sample
      7.7.3 Test equipment
      7.7.4 Test procedure
      7.7.5 Lighting using natural light
8 Additional calculation methods for transmittance
  and reflectance of products
  8.1 General
  8.2 Venetian blinds
      8.2.1 General
      8.2.2 Ordinary venetian blind with incomplete
            closure, normal incidence
      8.2.3 Ordinary venetian blind with slats tilted
            at 45 degree, 45 degree solar altitude, 0 degree
            azimuth
      8.2.4 Ordinary venetian blind with slats in
            "Cut-Off" position, 30 degree solar altitude,
            0 degree azimuth
      8.2.5 Ordinary venetian blind with slats in
            horizontal position, 60 degree solar altitude,
            0 degree azimuth
  8.3 Vertical blinds
  8.4 Shutters
9 Test report
Annex A (informative) - Examples of test equipment
        for opacity characteristics determination
  A.1 General
  A.2 Example 1
  A.3 Example 2
Annex B (informative) - Determination of openness
        coefficient
  B.1 Method for fabrics made from opaque material
  B.2 Method for venetian blinds
Annex C (informative) - Determination of infrared
        properties
  C.1 General
  C.2 Determination
      C.2.1 IR properties of transparent materials
      C.2.2 IR properties in the case of holes in an
            opaque layer
      C.2.3 IR properties of venetian blinds
Annex D (informative) - Approach in case of
        projecting solar protection devices
  D.1 General
  D.2 Detailed model
      D.2.1 Reduction factor of direct radiation
      D.2.2 Reduction factor for diffuse and reflected
            radiation
  D.3 Simplified approach for summer
  D.4 Examples of calculation
      D.4.1 General
      D.4.2 Mean values of x for summer
      D.4.3 Calculations

Describes test and calculation methods for the determination of the reflection and transmission characteristics to be used to determine the thermal and visual comfort performance classes of external blinds, internal blinds and shutters, as specified in EN 14501.