GB/T 25965-2010Test methods of normal emittance of materials and hemispherical emittance of all-glass evacuated collector tubes (English PDF)
材料法向发射比与全玻璃真空太阳集热管半球发射比试验方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
January 10, 2011
Implementation date
May 1, 2011
Scope
GB/T 25965-2010 is the English-translated version of 材料法向发射比与全玻璃真空太阳集热管半球发射比试验方法.
GB/T 25965-2010 is the Chinese standard "Test methods of normal emittance of materials and hemispherical emittance of all-glass evacuated collector tubes".
Its scope clause reads: This standard specifies the measured spectrum selective absorbing coating method to transmit than with all-glass vacuum tube solar collector absorbing coating hemisphere emission ratio Equipment, devices and requirements and sample size requirements, test conditions, test procedures and test methods.
This standard applies to materials and spectrally selective absorbing coating in the development and production process to transmit and process specifications screening method of the sample The ratio of all-glass vacuum tube solar collector hemisphere emission measurement ratio.
Its clauses include terms, symbols and units; normal emissivity ratio measurement method.
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Document preview — GB/T 25965-2010
National Standard of the People's Republic of China
- ICS
- 27.160
- Classification
- F 01
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 3 Terms, symbols and units
- 4 normal emissivity ratio measurement method
1 Scope
This standard specifies the measured spectrum selective absorbing coating method to transmit than with all-glass vacuum tube solar collector absorbing coating hemisphere emission ratio
Equipment, devices and requirements and sample size requirements, test conditions, test procedures and test methods.
This standard applies to materials and spectrally selective absorbing coating in the development and production process to transmit and process specifications screening method of the sample
The ratio of all-glass vacuum tube solar collector hemisphere emission measurement ratio.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 12936 solar thermal terms
GB/T 17049 all-glass vacuum tube solar collector
3 Terms, symbols and units
GB/T 12936 and established the following terms and definitions apply to this standard.
3.1 Degree of radiation emitted radiantexitance
Me, W/m2
At a point away from the surface of the radiant energy flux bins, divided by the surface of the cell area.
3.2 Emission ratio emittance
epsilon, dimensionless
Shoot degrees than the degree of radiation emitted radiation at the same temperature radiator with full radiator (black body) is.
3.3 Hemisphere emission ratio
epsilonh, dimensionless
At the same temperature, the ratio of the degree of radiation emitted in the solid angle 2pi radiator degree of radiation emitted and blackbody.
3.4 Normal emissivity ratio
epsilonn, dimensionless
The radiation emitted upward at a surface temperature than the law.
4 normal emissivity ratio measurement method
4.1 Measuring devices and requirements
Normal emissivity ratio measuring device consisting of a black body cavity, the sample chamber, zero calibration chamber, the thermosensitive element chamber and the water bath and so on. Blackbody chamber and test
GB 25327-2017 | GB 26920.2-2015 | GB 26920.1-2011 | GB/T 25969-2010 | GB/T 25968-2010 | GB/T 25959-2010 | […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Cited by
- GB/T 17049-2024All-glass evacuated solar collector tubes
- NB/T 10415-2020Glass-metal sealed direct connection evacuated solar collector tube for medium temperature
- GB/T 33297-2016All glass evacuated solar collector tube for medium temperature (100 °C to 150 °C)
- JG/T 403-2013Test methods for thermal performance of radiant cooling and heating unit
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