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ddelaiarro
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BLUF: Is it possible to mimic a solar loading environment solely in a temperature chamber and, if so, how?
We have an 6061 Aluminum box with a known heat load inside. It needs to be subjected to a solar load IAW MIL-STD-810G, Method 505.4, Proc I. Essentially, it is a 24-hour exposure cycle with varying ranges of temperature and solid load. Our company has a thermal chamber (too small to put heat lamps in) that we'd like to pretest our units into make sure we pass qualification testing. We can't create a solar load with our equipment, but what I'd like to do is create a temperature profile that would essentially mimic the total heat load our module will experience during solar load.
I know the following:
- Surface area of the module, A
- Reflectance level for the paint used
- Temperature and Thermal Loading (W/m2) profiles for the 24-hour cycle
What I'd like to do is convert the known Power from the solar load (W/m2 * A) at each temperature interval to a [tex]\Delta[/tex]T that I can add to the prescribed ambient temperature to essentially mimic the solar loading in my thermal chamber.
In scouring the internet, I have run into http://en.wikipedia.org/wiki/Sol-air_temperature" . The concept makes sense, but I am having a lot of trouble with the [tex]\Delta[/tex]Qir value. The values for Fr, hr and [tex]\Delta[/tex]To-sky are eluding me.
Any suggestions?
We have an 6061 Aluminum box with a known heat load inside. It needs to be subjected to a solar load IAW MIL-STD-810G, Method 505.4, Proc I. Essentially, it is a 24-hour exposure cycle with varying ranges of temperature and solid load. Our company has a thermal chamber (too small to put heat lamps in) that we'd like to pretest our units into make sure we pass qualification testing. We can't create a solar load with our equipment, but what I'd like to do is create a temperature profile that would essentially mimic the total heat load our module will experience during solar load.
I know the following:
- Surface area of the module, A
- Reflectance level for the paint used
- Temperature and Thermal Loading (W/m2) profiles for the 24-hour cycle
What I'd like to do is convert the known Power from the solar load (W/m2 * A) at each temperature interval to a [tex]\Delta[/tex]T that I can add to the prescribed ambient temperature to essentially mimic the solar loading in my thermal chamber.
In scouring the internet, I have run into http://en.wikipedia.org/wiki/Sol-air_temperature" . The concept makes sense, but I am having a lot of trouble with the [tex]\Delta[/tex]Qir value. The values for Fr, hr and [tex]\Delta[/tex]To-sky are eluding me.
Any suggestions?
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