Test Background
The environment where the solar collector heat absorber works has a certain temperature and humidity, and some environments have relatively high temperature and humidity. If the heat absorber is exposed to such a high temperature and humidity environment for a long time, its performance and life will be affected to a certain extent.
Therefore, it is necessary to conduct high temperature and high humidity tests on the product to understand the performance of the product in this aspect. If it does not meet the requirements, the product needs to be improved accordingly. The high temperature and high humidity test of the solar collector absorber can determine the high temperature and high humidity performance of the solar collector absorber.
Zhongke Testing Reliability Experiment Center has the reliable performance of various solar collector absorbers and provides professional high-temperature and high-humidity testing 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. Cut three 50 mm × 50 mm 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. Place the sample into a test chamber with a temperature of 100°C and a humidity of 80% RH. Take it out after 24 hours and test the solar absorption ratio and normal emission ratio again according to the requirements of GB/T 25968 and GB/T 25965. Take the average value and retain 2 decimal places.
3. After the test, the coating and substrate should be free of cracks, blisters, peeling and corrosion. There should be no more than 10 pitting corrosion and peelings with a diameter greater than 1 mm in a 50 mm × 50 mm area. The attenuation coefficient of the optical performance of the heat absorber surface should be ≤0.1, 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
