How does the UV aging test chamber calculate how many days of outdoor exposure are equivalent to one day's irradiation?
How does the UV aging test chamber calculate how many days of outdoor exposure are equivalent to one day's irradiation? This question is often asked by customers, and it is impossible to estimate exactly.
Because outdoor lighting is not only related to seasons and regions, but also has a close relationship with temperature. Different places, different altitudes, different seasons, different lighting. So we can only approximate.
Taking southern Guangdong as an example, the value is 1500KWh/m2.year, and then divided by 8760 hours a year to get 171Wh/m2 (that is the annual average hourly solar radiation)
The total radiation intensity is 1120W/m2, at this time, at 340nm, the measured irradiance value is 0.68.
Now, we can deduce that at a set value of 0.68W/m2 at 340nm, this is equivalent to 6.55 times the outdoor irradiance. However, UV aging test chamber aging is closely related to temperature.
The annual average temperature in Guangzhou is 21.8 degrees. When the temperature rises by 1 times, the empirical evaluation will enhance the aging effect by about 1.5 times. Therefore, when the set temperature is 60 degrees, there are 60/21.8*1.5*6.55=27 days.
That is: do 1 day UV aging test chamber test, which is equivalent to the aging effect of 27 days outdoors. (60 degrees, 0.68W/m2 at 340nm).
UV aging test chamber is used in different places, and the measured aging effects are also different.
