R
Rich Grise
Have you tried google?
Good Luck!
Rich
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Categories
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Content
Have you tried google?
Good Luck!
Rich
A
Archimedes' Lever
I mentioned it right at the start of the thread, and was even derided
for it.
I guess some folks will have to come fool circle to realize they were
wrong.
F
Fred Bartoli
John Larkin a écrit :
Thermal resistance is in K/W, while you're speaking of K/W/ohm.
I wonder how this should be called.
Thermal resistance is in K/W, while you're speaking of K/W/ohm.
I wonder how this should be called.
J
John Larkin
Thermal resistance per ohm, just like I wrote it.
Most pure metals hit about the same value. Brass is about 2:1 higher,
so use brass screws to conduct electricity with minimum heat transfer.
John
J
John KD5YI
Jim Thompson said:Several years ago, as an aside to another thermal question, I asked...
"Brings to mind a thing I've been pondering... what's the thermal
resistance of 3/4" plywood ?"
Never saw a response.
From http://www.engineeringtoolbox.com/thermal-conductivity-d_429.html
about .13 W/mK is the thermal conductivity. So, about 7.7 mK/W resistivity.
I estimate about 86 or so watts.
Not much.
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine Sometimes I even put it in the food
Cheers,
John
J
Jim Thompson
Jim Thompson said:Several years ago, as an aside to another thermal question, I asked...
"Brings to mind a thing I've been pondering... what's the thermal
resistance of 3/4" plywood ?
Never saw a response.
From http://www.engineeringtoolbox.com/thermal-conductivity-d_429.html
about .13 W/mK is the thermal conductivity. So, about 7.7 mK/W resistivity.
I estimate about 86 or so watts.
Not much.
[snip]
Cheers,
John
I swagged 63W... much more than I anticipated... another WAI
(wild-ass-idea) down the tubes :-(
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat || E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine Sometimes I even put it in the food
J
Jim Thompson
OK, useful numbers, and right on-point... dryer application. I don't
want the light, so I'll just use big wirewounds bolted to a finned
heatsink/source ;-)
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat || E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine Sometimes I even put it in the food
S
Spehro Pefhany
At room temperature --- Wiedemann–Franz. The ratio is PTAT, right?
J
John KD5YI
z.b. said:
I stand corrected. I used the wrong coefficient for natural convection.
Thanks.
Cheers,
John
A
Archimedes' Lever
Use big nylon nuts and bolts. Or glass filled epoxy.
T
TheJoker
A rare moment of lucidity.
J
John Larkin
Which don't conduct electricity very well.
John
A
Archimedes' Lever
You do not have to rely on the fasteners to provide the conduction path
between two mating surfaces. In fact, you shouldn't.
I thought you were talking about thermal conduction anyway.
J
John Larkin
I was talking about the thermal conductivity of electrical conductors.
The same electrons that transport current also transport heat - pretty
much - so most metals are the same as regards how much current you can
carry for a given heat loss. This matters for stuff like getting power
into a crystal oven or a cryogenic gadget, where we really don't want
the heat loss through the leads.
People use stainless and manganin wire to run to really cold (liquid
helium) gadgets so as to not leak too much heat. Google "Garwin
thermal integral" for some messy math.
John
R
Rich Grise
That's because you've got all the smart people plonked. There were at
least a half-dozen good responses, but apparently the sand got in
your eyes.
the hell should we do his googling for him?
Thanks,
Rich
least a half-dozen good responses, but apparently the sand got in
your eyes.
Thompson is such an asshole, he doesn't really deserve an answer - why
the hell should we do his googling for him?
Thanks,
Rich
L
life imitates life
Spot on.
J
John KD5YI
Rich Grise said:
Well, first of all, it's not my job to try to decide who deserves an answer
and who does not.
Second, I find that I learn things by trying to help others. So, it's
somewhat of a selfish motive, I guess.
You're welcome,
John
J
Jim Thompson
Aaaaah! Life is wonderful... I've been promoted to "asshole"! Are
there grades of "asshole", like "lieutenant asshole", or "rear admiral
asshole"... ?
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat || E-mail Icon at http://www.analog-innovations.com | 1962 |
Obama: A reincarnation of Nixon, but without ANY scruples,
masquerading in politically-correct black-face.
K
krw
Aaaaah! Life is wonderful... I've been promoted to "asshole"! Are
there grades of "asshole", like "lieutenant asshole", or "rear admiral
asshole"... ?
Sure, many of us are privates, but there are also general assholes,
like Slowman and DimBulb. ...and of course, the leftist fairies'
assholes aren't private at all.
S
StickThatInYourPipeAndSmokeIt
No I'm an Admiral.
You? You are like that of a sunspot on my dim bulb. That is the level
of your existence. A thermal void.
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