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BS EN 14500:2021

BS EN 14500:2021

$215.11

Blinds and shutters. Thermal and visual comfort. Test and calculation methods

Published By Publication Date Number of Pages
BSI 2021 88
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This document defines 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 14501:2021.

This document also specifies the method to determine the darkening performance of external blinds, internal blinds and shutters, as specified in EN 14501:2021.

This document applies to the whole range of shutters, awnings and blinds defined in EN 12216, described as solar protection devices in this document. Some of the characteristics (e.g. gtot) are not applicable when products are not parallel to the glazing (e.g. folding-arm awnings).

NOTE 1

Informative Annex D presents an approach for the determination of characteristics in case of projectable products.

Retro-reflecting products are outside the scope of this document for reflectance measurements.

NOTE 2

Retro-reflecting products refer to products for which the reflected radiation comes back to the light source in the same direction.

Products using a significant amount of fluorescent are outside the scope of this document.

NOTE 3

ā€œSignificant amountā€ refers to materials which are designed to be fluorescent or retroreflective and marketed as such. It does not refer to trace amounts of materials exhibiting fluorescence, e.g. for colour or identification purposes. Small amounts of materials such as titanium dioxide, which are not primarily included to achieve fluorescence, can be present.

PDF Catalog

PDF Pages PDF Title
2 undefined
9 1 Scope
2 Normative references
10 3 Terms and definitions
14 4 Notations used
17 5 Test and calculation methods to be used according to product – Guidelines
19 6 Determination of transmittance and reflectance with an integrating sphere
52 7 Determination of Ļ„n-n and Ļ„dir-dir from direct measurement
57 8 Determination of the cut-off angle
60 9 Determination of darkening performance of solar protection devices and opacity performance of curtain materials
66 10 Calculation of the diffuse hemispherical transmittance Ļ„dif-h
67 11 Test report
68 Annex A (informative)Examples of test equipment for darkening and opacity characteristics determination
A.1 General
A.2 Example 1
70 A.3 Example 2
72 Annex B (informative)Determination of openness coefficient
B.1 Method for fabrics made from opaque material
B.2 Method for venetian blinds
73 Annex C (informative)Determination of infrared properties
C.1 General
C.2 Determination
C.2.1 IR properties of transparent materials
74 C.2.2 IR properties in the case of holes in an opaque layer
C.2.3 IR properties of venetian blinds
76 Annex D (informative)Approach in case of projecting solar protection devices
D.1 General
D.2 Detailed model
D.2.1 General
77 D.2.2 Reduction factor of direct radiation
D.2.3 Reduction factor for diffuse and reflected radiation
78 D.3 Simplified approach for summer
D.4 Examples of calculation
D.4.1 General
D.4.2 Mean values of x for summer
79 D.4.3 Calculations
82 Annex E (informative)Decision tree for critical samples
83 Annex F (informative)Additional information for venetian blinds and louvres
F.1 Venetian blinds
F.1.1 General
F.1.2 Ordinary venetian blind with incomplete closure, normal incidence
84 F.1.3 Ordinary venetian blind with slats tilted at 45Ā°, 45Ā° solar altitude, 0Ā° azimuth
F.1.4 Ordinary venetian blind with slats in ā€œCut-Offā€ position, 30Ā° solar altitude, 0Ā° azimuth
F.1.5 Ordinary venetian blind with slats in horizontal position, 60Ā° solar altitude, 0Ā° azimuth
85 F.2 Louvres
86 Annex G (informative)Additional information for shutters

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BS EN 14500:2021
$215.11