DEI Reflect-A-Gold Foil Test
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- Опубліковано 7 сер 2016
- I bought some of this foil to cover the bottom of my air to water intercooler. With the scraps left over, I wanted to test the performance against radiated heat. I didn't expect these results.
I could possibly be doing this all wrong, but I went with the knowledge I have. - Наука та технологія
Interesting, but a couple problems I see with your experimental setup - hear me out, this isn't an attack, merely observations:
1) The aluminum samples are not the same size (different thermal mass = different temperature increases of the same power over the same time).
2) The gold-film covered sample is over the top of the heat-plate more than the larger uncovered sample (more thermal energy input = more temperature rise in the same time, even if the samples were the same size)
3) The clamp load on the samples by the stand affects how much of a heat sink the stand is, you need to use thermal insulators to hold the sample.
4) The heat-plate is designed for heating via conduction, not radiation - use an quartz IR heat source, or a bathroom heat bulb instead.
5) You have placed the samples over the convection air column (heat rises), meaning, you are contaminating the experiments purpose with another heat transfer mode. The samples should be placed vertically facing the radiation heat source, out of any and all air flows.
6) Just because paint is black does not make it a good radiator of heat - some darker commercial paints are being produced with IR reflective properties, which reduce head gain under sun-load. Use a refractory heat emissive paint which is specifically designed to radiate heat from the painted sample.
7) Your "control" temperature sensor, is also not set up to absorb IR heat - it should be painted black, like with a flat heat emissive paint.
8) Another rule of thumb, flat-painted or rough surfaces is better than glossy-painted or smooth for use with IR sensors.
9) Really you should measure the temperature of your samples with a conductive measurement - otherwise you are adding another radiation step into the experiment. In the lab I worked in, we ALWAYS used a calibrated thermocouple to obtain accurate material temperatures. If you then use an IR imager to look at the sample, you will see the temperature reading at the thermocouple, and can correct any errors generated by the IR imager.
What you should probably do is place two samples of exactly the same size in the middle of a 1-foot-long tubular mineral fiber holder, those samples should be placed vertically behind a cutout which allows a known-size exposure to the IR source (like 4 square inches, 2"x2") with no IR allowed to pass to and "illuminate" the mineral fiber support structure. The tube will prevent convection from distorting the surface temperatures. You would also need to demonstrate that you have "calibrated" your test setup by placing a reference measurement element in each position (like a black painted temperature sensor). If your setup is good, from a given starting temperature and fixed ambient temperature, the rate of rise and ultimate steady-state temperature should be the same for the calibration sensor in both positions. Finally, having a control sample for each type where no radiated heat is applied to the samples, will help you measure the actual differences.
Short of going through all of that hassle, this doesn't appear to be what I'd call "good data" on how the gold film performs when applied to aluminum with respect to radiated heat.
Question is the intake tube is getting conductive heat from the throttle body or turbo by which it is connected. So would this show that it is better to keep the pipe unwrapped to bleed off heat, or worse because heat that is bled off and not retained must be ending up elsewhere like the air in and out of the Intake.
Now THIS is a proper answer, with proper tests. Well said Tim S.
Thanks for putting the work in it is nice that people try these things. Like below I did notice that a much larger percentage of the DEI plate was over the hot plate. I would expect more heat to be introduced to the material. If you are still doing experiments maybe try to get them a little more even. Thanks!
I loved the test you did!!! 🤓👌👍💪 could you do more!!??? I'd love to see dynamat vs a high heat resistant ceramic maybe? Or Fat Mat vs lizard skin?
In my opinion the 2 test pieces should be an enclosed or semi enclosed with the temp readings from inside. Maybe use a couple tubes long enough so that the open ends are not affected by the heat source. This will simulate the true purpose of the heat wrap. It’s not like you are only covering the part of t your intake that faces your headers. With all that said I’m really glad someone decided to test this product to see if it actually work and not just using it because you see your friends with it. Thanks.
Great test! Funny results!
It's fair, as the area of the aluminum sheet that can dissipate heat is now smaller (only one side).
Are these infrared vision things bloody expensive?
Try flipping the plate. So the gold side it facing up.
no wonder if the unwrapped plate is much bigger. Try to do it with same sizes or even with the same plate on the same position in order of time.
It wasn't an emperical, scientific test. I was just messing around with scraps I had. Thanks for the suggestions, though.
Try it again but with the gold side not over the heater but to the other side. Gold absorbs heat and dissipates it faster its not really reflecting it. The benefit of having gold wrapped ic or piping is that the hoses have higher temperature due to turbo increasing it, so it dissipates heat into engine bay air whitch is cooler.
Smaller plate different controls failure experiment
Should have angled the plates so it didn't reflect the heat rite back at the hot plate. Seems that would make that side hotter. maybe? Also when you wrap a tube it reflects the heat in all diffrent directions due to the nature of the tube. May work better on a curved surface.
Also... heat rises. The reflect tape is only going to reflect the infrared. The tape isnt going to insulate against convection.
Shouldn't the plates be flipped in order to see how well it dissipates heat?
Use steel.