B&W temp experiment.

[Ruffshooter]

Here is the first run of the experiment. Kind of impromptue (sp)
Did this this late afternoon.
Two identical Home Depot buckets. One painted gloss black the othe painted gloss white.
Two 12" Brinkman turkey fryer thermometers drilled into the top of the lid of each bucket. with in 1/2degree of each other.
One hand held Commerical Electric laser infared thermometer. Forgot to photo the temps on the scanner screen will on the next run.
At 5:15pm it was 75 degree air temp.
Both buckets started the same (considering the minor gage difference)
At 5:35pm the white buckets was at 80 degrees f. The black bucket was at90 degrees. (the bb had the lower thermometer.)
The surface temp of the white bucket was 77.5 according to the scanner.
The surface temp of the black bucket was 115 degrees according to the scanner.
I will do again tommorow mid day, It will be in the mid 70's again.

[Ruffshooter]

Don't know why the photos are cut off.
Disclaimer: I am no Scientist evicently I can not even spell it correctly. :roll:
I know aluminum and plastic have different properties but I am not going to buy two aluminum dog boxes to do this experiment.

[GUNDOGS]

WOW, big difference..interesting..ruth

[ezzy333]

Most of us have worn black or white clothing out in the sun and it only takes a few seconds to tell the difference. Wonder if that is why you will never see black garb in the deserts or hot climates> Think about it.

Ezzy

[dog dr]

this experiment sounds like something the government would charge the taxpayers millions of dollars for, and then anounce the findings and tell us all something we already knew.

[Ruffshooter]

I think I am more competent than the Govt.
I am willing to accept donations.
Doc. Read the Box thread. this is why I am doing this.

[displaced_texan]

I think I am more competent than the Govt.
I am willing to accept donations.
Doc. Read the Box thread. this is why I am doing this.

I figured it was because of my box thread.

An unvented, uninsulated plastic bucket and a vented aluminium box with carpeted top storage and insulation are not really comparable.

[dog dr]

I think I am more competent than the Govt.
I am willing to accept donations.
Doc. Read the Box thread. this is why I am doing this.

Oh I know, I figured it had something to do with that. Sorry, wasnt trying to be a smart a$$! I'm just feelin squirrely this morning! I like the way you set up the experimaent, though.

[Ruffshooter]

Okay by me Doc. Kind of feeling that way too.

[wems2371]

People mention insulation quite a bit. While any insulation will be better than none, out of curiosity, what is the R Value on some of these dog boxes? I just about never see it mentioned, and I was dog box hunting not too long ago. Makes me suspect the R Value might be very low, if it isn't worth mentioning.

Ruffshooter is trying to compare apples to apples with black & white, not a bucket to a dog box. If only he would go buy two dog boxes and do the black/white thing...

[Ruffshooter]

Today: can't do the photos from here but here is the data.
Air temp. 76.6
White bucket internal temp. 85.2 degrees
White bucket surface temp. 86.7 degrees
Black bucket internal temp. 95 degrees
Black bucket surface temp. 121 degrees.

The next part of the experiment will take a few days. I will need to find a couple fans that would be similar in proportion to the kennel fans CFM.

I will cut them into the buckets and add a vent of appropriate size.

Thanks for looking and being objective.
Rick

[Ruffshooter]

Wems:
My box I built is R-7.5 It is a construction grade foam.
I believe the white foam is R-5 +-.
Fiberglass in the shamrocks is less like R- 3.5 I think that is pretty close.

[displaced_texan]

To approximate the average dog box you really need to do it with vents.

I've measured inside my current dog box, it wasn't ever hotter than ambient. And it's black, uninsulated, with carpeted top storage.

The plastic kennels really heat up in the sun though. I assume because the sun really beats down on the top of them.

I wish I could find my Fluke temp probe...

[markj]

The only true way to do this is get into each box in the sun for 3 hours

[A/C Guy]

To approximate the average dog box you really need to do it with vents.

The vents aren't necessary since he is only interested in the temp variation due to the choice of color.

The plastic kennels really heat up in the sun though. I assume because the sun really beats down on the top of them.

Plastic is a better insulator than aluminum. Ever notice how a plastic spoon in hot coffee does not transfer the heat? Aluminum is a great conductor though. The aluminum topped boxes on my work truck get dangerously hot when the truck is parked in the sun. I frequently get burned by them. My plastic boxes do not get nearly as hot.

I've measured inside my current dog box, it wasn't ever hotter than ambient. And it's black, uninsulated, with carpeted top storage.

Your carpeted top storage is an insulation zone, that is the reason why the inside of your box does not get too hot. An uninsulated aluminum box in Az would be a solar oven and would quickly reach deadly temperatures.