GB/T 33234-2016 English PDF (GBT33234-2016)

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GB/T 33234-2016: Reflectance test method of reflective glass mirror for concentrated solar power system
GB/T 33234-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 81.040.30
Q 34
Reflectance test method of reflective glass
mirror for concentrated solar power system
ISSUED ON. DECEMBER 13, 2016
IMPLEMENTED ON. NOVEMBER 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword . 3 
1 Scope .. 4 
2 Normative References . 4 
3 Terms and Definitions .. 4 
4 Apparatus .. 5 
5 Test sample and standard sample .. 6 
6 Test Conditions .. 7 
7 Test procedures and test results .. 7 
8 Test report .. 10 
Annex A (Normative) Data sheet of solar direct spectral irradiance AM1.5D
.. 11 
Reflectance test method of reflective glass
mirror for concentrated solar power system
1 Scope
This Standard specifies the terms and definitions, apparatus, test sample and standard
sample, test conditions, test procedures, test results and test report of reflectance test
method of reflective glass mirror for concentrated solar power system.
This Standard applies to the test and calculation of solar hemispherical reflectance and
specular reflectance of reflective glass mirror for concentrated solar power system.
This Standard can be referred to for reflective glass mirror for concentrating
photovoltaic and other types of reflective glass mirrors.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to This Standard.
ISO 9050, Glass in building - Determination of light transmittance, solar direct
transmittance, total solar energy transmittance, ultraviolet transmittance and related
glazing factors
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
solar hemispherical reflectance
The ratio of solar radiation flux to incident solar radiation flux reflected by sample within
a 2 π solid angle, within the solar spectrum (300 nm ~ 2 500 nm) band, whose value
is usually expressed in percentage.
3.2
specular reflectance
b) the intersection angle between ray axis of lighting beam and normal of sample
shall not be greater than 15°;
c) use integrating sphere equipped with photoelectric detector and incidence hole.
It is preferable to use integrating sphere of diameter not less than 150 mm. When
integrating sphere of other dimensions is selected, the area sum of all integrating
sphere openings shall be less than 4% of internal surface area of integrating
sphere;
d) the accuracy of wavelength of instrument shall be within ± 1 nm;
e) the accuracy of photometric measurement of instrument shall be within ± 1% and
the measuring repeatability shall be within ± 0.5%;
f) instrument shall not be influenced by extraneous light during measurement.
4.2 Specular reflectance test instrument
Test instrument shall meet the requirements as follows.
a) it is capable of measuring the specular reflectance under a certain wavelength of
660 nm of solar spectrum;
b) If receiving diaphragm is installed, receiving angle φ is controlled within 0 mrad
~ 20 mrad;
c) the intersection angle between ray axis of lighting beam and normal of sample
shall not be greater than 15°;
d) optical alignment can be conducted in accordance with the thickness and surface
curvature of reflective glass mirror, in order to make reflected light beam be fully
received by receiving diaphragm;
e) the measuring accuracy of instrument shall be within ± 1% and the measuring
repeatability shall be within ± 0.5%;
f) instrument shall not be influenced by extraneous light during measurement.
NOTE. Specular reflectance test instruments of other wavelengths can be as agreed on by
supplier and purchaser.
5 Test sample and standard sample
5.1 Test sample
Test sample shall meet the requirements as follows.
a) reflective glass mirror is used as test sample whose dimensions are preferably
prepared as required by instrument;
b) test sample shall be clean without dust, oil stain or other contaminants;
c) test sample press shall be close to the test opening of instrument without any gap
at the center;
d) the dimensions of test sample shall meet the requirements for tests at three
different positions at least, or at least 3 pieces of test sample are cut from
different positions of the same product.
5.2 Standard sample
Standard sample is preferably used for test, which have the reflective characteristics
similar to reflective glass mirror sample. Standard sample can be traceable to national
or international reference-standards.
6 Test Conditions
Test shall be conducted in the environment of (23 ± 2)°C and relative humidity (40 ±
15)%. Test sample is preferably stored under the environmental conditions for 3 h at
least before test.
7 Test procedures and test results
7.1 General rules
7.1.1 The reflectance test process specified in ISO 9050 can be referred to for solar
hemispherical reflectance test.
7.1.2 For solar hemispherical reflectance test, the spectral range shall be at least 300
nm ~ 2 500 nm and the wavelength interval shall be not greater than 5 nm.
7.1.3 The certain wavelength for specular reflectance test shall include 660 nm and
it is not limited to this wavelength.
7.1.4 Beam correction can be conducted by specular reflectance test instrument in
accordance with the glass thickness and surface curvature.
7.1.5 Instrument shall be preheated for 5 min ~ 30 min before each test, in
accordance with instrument instructions.
7.2 Solar spherical reflectance test
7.2.1 Test procedures