Solar radiation on glass with Fluid Flow (CFX)

scottr99 · September 27, 2016, 17:00

Hello, I'm wanting to see the temperature gradient through a thin (0.125") thick glass shielding. It's a solar load requirement of 1000 W/m^2, mid-day sunlight. I tried a simple example with Aluminum because since it's already available in CFX, but the results don't really make sense because the temperature barely changes (<1 degree F) from exposed surface to inside surface.

Has anyone done anything like this that can give me a tip or two?

Thanks in advance.

monkey1 · September 28, 2016, 01:47

What exactly do you expect to happen on such a thin foil?
Especially aluminium which has a high heat transfer coefficient, will directly transfer the heat on both sides, as the thickness is quite negligible with 0.1"

Nevertheless you should ask more precise questions explaining what you have done / set up as a case file, what was the result and what is disturbing you.

evcelica · September 29, 2016, 12:14

1000 [W/m^2] * 0.125[in] / 236 [W/m/K] = 0.013 [K]
You don't need CFD to figure that out.

Like Monkey says, please explain your problem in more detail.

scottr99 · September 29, 2016, 12:20

Hi thank you. What I was actually puzzled by was how little it changed from ambient. I'm sorry for the confusion. I decided to wait until I had more details on the actual problem before I got back. At the time I was just working on a little test model, and again, surprised that it only increased from ambient by a very small amount. So I have more work to do. Sorry about the lack of details.

September 27, 2016, 17:00	Solar radiation on glass with Fluid Flow (CFX)	#1
scottr99 New Member NC Join Date: Sep 2016 Posts: 2 Rep Power: 0	Hello, I'm wanting to see the temperature gradient through a thin (0.125") thick glass shielding. It's a solar load requirement of 1000 W/m^2, mid-day sunlight. I tried a simple example with Aluminum because since it's already available in CFX, but the results don't really make sense because the temperature barely changes (<1 degree F) from exposed surface to inside surface. Has anyone done anything like this that can give me a tip or two? Thanks in advance.

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September 28, 2016, 01:47		#2
monkey1 Senior Member Join Date: Jul 2011 Location: Berlin, Germany Posts: 173 Rep Power: 14	What exactly do you expect to happen on such a thin foil? Especially aluminium which has a high heat transfer coefficient, will directly transfer the heat on both sides, as the thickness is quite negligible with 0.1" Nevertheless you should ask more precise questions explaining what you have done / set up as a case file, what was the result and what is disturbing you.

September 29, 2016, 12:14		#3
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	1000 [W/m^2] * 0.125[in] / 236 [W/m/K] = 0.013 [K] You don't need CFD to figure that out. Like Monkey says, please explain your problem in more detail.

September 29, 2016, 12:20		#4
scottr99 New Member NC Join Date: Sep 2016 Posts: 2 Rep Power: 0	Hi thank you. What I was actually puzzled by was how little it changed from ambient. I'm sorry for the confusion. I decided to wait until I had more details on the actual problem before I got back. At the time I was just working on a little test model, and again, surprised that it only increased from ambient by a very small amount. So I have more work to do. Sorry about the lack of details.