GB/T 6424-2021 in English
VALIDFlat plate solar collectors
- Issued on:2021-12-31
- Implemented on:2022-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
$418.00
《GB/T 6424-2021平板型太阳能集热器》由TC402（全国太阳能标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Core revisions to the standard
| Revisions | Requirements of the 2007 version | Requirements of the 2021 version | Technical improvement |
|---|---|---|---|
| Rated efficiency | Not specified | ≥0.47 | New core energy efficiency indicators |
| Maximum operating temperature | No labeling required | Mandatory explicit indication | Improve safety |
| Heat absorber coating | Appendix C recommendation | Implementation of GB/T26974 | Technical requirements upgraded |
| Transmittance | Unquantified | ≥0.90 | Clear optical performance |
Analysis of key technical requirements
1. Structural dimension specifications
The standard recommends the use of 5 structural types such as tube-sheet type, and the overall dimensions should comply with the building modulus:
- Plane dimension tolerance: IT14 level accuracy (GB/T1800.1)
- Inlet and outlet pipe diameters: 15-50mm, six specifications
- Heat absorber warpage: ≤IT16 level accuracy
2. Performance indicator system
Dual-track evaluation of thermal performance:
The instantaneous efficiency curve based on the lighting area and the total area must be provided at the same time, where:
- Peak efficiency: η0≥0.75 (lighting area benchmark)
- Rated power: P=η×Aa×1000W
Implementation suggestions
Testing process optimization
- Non-destructive tests (appearance, pressure resistance) should be given priority
- Thermal performance test should be completed under 4 temperature difference conditions
- Mechanical load test requires pressure on both the front and back sides
Key points of quality control
- The welding of heat absorber shall comply with GB/T12467.3 Grade III standard
- The thermal conductivity of insulation material shall be ≤0.045W/(m·K)
- The deviation of lighting area shall be controlled within ±3%
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