How to Calculate Irradiance
In optics, irradiance is the power per unit area of electromagnetic radiation incident on a curved surface. Radiant emittance (radiant exitance) is the power radiated from a surface per unit area. Using the International System of Units, the units of these physical quantities are watts per square meter (W/m2). Irradiance is a crucial parameter in the Xenon Arc Tester. Many people will be curious about its calculation. Here is an introduction to how to calculate it.
What is the total annual solar radiation?
The total annual solar radiation: the accumulation value of solar radiation which reach the ground at per unit area in one year.
The total annual solar radiation of each country is different.
Due to more clouds and rain near the equator, so the high value area of total annual solar radiation is not at equator, but at nearby latitude 20º. The global maximum value area is in southern Egypt, about 9200MJ.
How to convert?
Parameters
Conversions
- The radiation power in YG611T is 49000μW/m2, 49000μW/m2=490W/m2
- Sample area: 1 m2
- Testing time: 1 hour
- Energy effected on sample in one hour
- Energy effected on sample in a month
Conversions
- In south China, the average value of total annual solar radiation is about 5000 MJ (this value you can consult with domestic related departments). The average value of monthly is 5000MJ÷12≈420MJ.
- 1267MJ÷420MJ≈3, so we can conclude that sample in YG611T 1 hour equal in sunlight 3 hours, in chamber is 3 times in outdoor.
Bench Xenon Arc Tester
Bench Xenon Arc Tester, also called colorfastness Weathering Test Equipment, which is suitable for new materials applied in different environment, it is used for the quality control of materials and components, production of conventional test, etc. Filtered xenon lamp can be used as accurate simulation of solar radiation.
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