prEN ISO 22969

SLOVENSKI STANDARD
oSIST prEN ISO 22969:2020
01-september-2020
Barve in laki - Določevanje odboja sončne svetlobe (ISO 22969:2019)
Paints and varnishes - Determination of solar reflectance (ISO 22969:2019)
Beschichtungsstoffe - Bestimmung der solaren Reflexion (ISO 22969:2019)
Peintures et vernis - Détermination de réflexion solaire (ISO 22969:2019)
Ta slovenski standard je istoveten z: prEN ISO 22969
ICS:
87.040 Barve in laki Paints and varnishes
oSIST prEN ISO 22969:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Apparatus ..................................................................................................................................................................................................................... 2

4.1 Spectrophotometer ............................................................................................................................................................................. 2

5 Procedure..................................................................................................................................................................................................................... 2

5.1 Spectral reflectance of test specimen .................................................................................................................................. 2

5.2 Reference global solar radiation .............................................................................................................................................. 2

5.3 Determination of solar reflectance ........................................................................................................................................ 3

6 Test report ................................................................................................................................................................................................................... 3

Annex A (informative) The reference global radiation table ...................................................................................................... 4

Annex B (informative) Example of a determination method of solar reflectance.................................................8

Bibliography .............................................................................................................................................................................................................................14

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bodies (ISO member bodies). The work of preparing International Standards is normally carried out

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This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee

Any feedback or questions on this document should be directed to the user’s national standards body. A

The solar reflectance property of a coating system is determined by the absorbed solar energy

This property can be expressed by a numerical value determined by calculation, thanks to which the

impact of solar energy (especially heat) on the environment can be easily understood.

Reduction of greenhouse gases and carbon dioxide (CO ) is achieved by reflecting the solar energy back

into the atmosphere, which, reduces global warming. The effect of energy saving by coating system can

This document specifies a method to determine the solar reflectance of coating systems using a

spectrophotometer with a wide spectral range (300 nm to 2 500 nm) and global solar radiation.

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 3270, Paints and varnishes and their raw materials — Temperatures and humidities for conditioning

For the purposes of this document, the terms and definitions given in ISO 4618 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

total of the direct solar radiation incident on a horizontal surface plus all sky and horizontal ground

ratio of the reflected radiant or luminous flux to the incident flux in the given spectral composition,

ratio of reflected radiant flux to global solar radiation (3.1) on coating system

hollow sphere whose internal surface is a diffuse reflector, as non-selective as possible

Note 1 to entry: An integrating sphere is frequently used with a radiometer or photometer.

instrument for measuring the ratio of two values of a radiometric quantity at the same wavelength

Spectrophotometer with a spectrometer capable of collecting radiations from 300 nm to 2 500 nm

utilizing an integrating sphere with either 8°:di or di:8° geometry so that the regular or specular

Measurement of spectral reflectance of test specimens shall use the apparatus described in Clause 4

and the scale used for reflectometers shall be traceable to national metrology institutions. Unless

otherwise specified, spectral reflectance is measured from 300 nm to 2 500 nm and sampling interval

The test specimens shall be measured at the standard conditions, a temperature of (23 ± 2) °C and a

relative humidity of (50 ± 5) %, as specified in ISO 3270. If the alternative conditions are used, it shall

Reference global solar radiation as defined by the SMARTS 2.9.5 model shall be used. The parameters

of reference global solar radiation are: at sea level for air mass, 1,0; aerosol optical depth, 0,10; water

vapor, 1,42 atm-cm; ozone, 0,340 atm-cm. The reference global solar radiation from 300 nm to 2 500 nm

for 5 nm interval is described in Annex A. If the parameter to calculate reference global solar radiation

NOTE SMARTS 2.9.5 is a free software. It can be downloaded from the following website: https: //www .nrel

Solar reflectance is determined by the spectral reflectance of test specimen and the reference global

NOTE In case of the wavelength interval is 1 nm instead of 5 nm, the formula becomes as follows:

e) the spectral wavelength range and measuring wavelength increments band width and nm-steps

Reference global solar radiation at sea level for air mass 1,0; aerosol optical depth 0,10; water vapor