Test Background
In order for the flat-panel solar collector heat-absorbing plate to maximize the absorption of solar radiation energy and convert it into heat energy, the heat-absorbing plate should be covered with a dark coating, which is called a solar absorption coating. The coating material of the heat absorbing panel plays a very important role in absorbing solar radiation energy. The solar collector absorber coating aging test can determine the coating aging performance of the solar collector absorber.
Zhongke Testing Reliability Experiment Center has the reliable performance of various solar collector absorbers and provides professional coating aging test services for solar collector absorbers.
Scope of tests
is divided into: copper, aluminum alloy, copper-aluminum composite, stainless steel, galvanized steel, plastic, rubber, etc. according to material type.
According to the structural form, it is divided into: tube plate type, wing tube type, flat box type, and snake tube type.
According to the type of coating, it is divided into: non-selective absorption coating and selective absorption coating.
Test method
1. Take 3 samples from the heat absorber, test the solar absorption ratio and normal emission ratio respectively according to the requirements of GB/T 25968 and GB/T 25965, take the average value, and retain 2 decimal places.
2. After the sample is tested for coating aging performance in accordance with the provisions of GB/T 26974-2011, the solar absorption ratio and normal emission ratio are tested again in accordance with the requirements of GB/T 25968 and GB/T25965, and the average value is taken and retained to 2 decimal places.
3. After the test, the coating should be free of peeling, the attenuation coefficient of optical performance on the surface of the heat absorber should be ≤0.05, and the adhesion should reach level 1 specified in GB/T 1720.
Test standard:
NB/T 34072-2018 Technical specifications for weather resistance of flat-plate solar collector absorbers
GB/T1720 Paint film adhesion determination method
GB/T 1865 Paints and varnishes Artificial weathering and artificial radiation exposure Filtered xenon arc radiation
GB/T6682 Analytical laboratory water specifications and test methods
GB/T12936 Solar thermal utilization terminology
GB/T 25965 Test method for normal emission ratio of materials and hemispheric emission ratio of all-glass vacuum solar collector tubes
GB/T 25968 Spectrophotometer test method for measuring solar transmittance and solar absorption of materials
GB/T 26974-2011 Technical requirements for flat plate solar collector absorbers
