#### thorilan

##### Member

removed by me thorilan

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#### RoD

##### Member
its got my vote, good post!

#### Korndog

##### Member
very nice thorilan.
this would make a nice reference.

a few questions though.
Q, from what i've learned, is heat, not the rate of heat/time.
the equation i learned was dQ/dT = uAdeltaT, although thats with derivitives, i think it would still be Q/T for an approx. answer. The units are all right though.

Good Job!

OP

#### thorilan

##### Member
removed by me thorilan

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#### SwampThing

##### Member
In thermal stufff, Q is just heat (thermal energy) measured in Joules. I or P is used for heat currents (dQ/dt) or power dissipation. Metric units would be better -- how many talk about their CPU's heat output in BTU/hr?

Too little surface area could raise velocities, thus friction losses, and shorten the coil's service life.
Not sure what you're talking about there.

OP

removed by me

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#### SwampThing

##### Member
True, this is for rads - rads in a computer water cooling forum. Since we use them to dissipate heat from our CPUs, GPUs, and pumps (heat that everyone measures in watts), why force everyone to convert to BTU when thinking about their radiator? Is the BTU a popular unit in Japan? Metric units are internationally understood.

Mechanical wear from high velocities -- got it.

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#### thorilan

##### Member
sticky requested via PM

#### Como

##### Member
"Is the BTU a popular unit in Japan"

btu = brittish thermal unit.
i couldnt resist

nice post. if i understood more i'd probably have a question about it...i have a feeling it will mean mre to me in a month or 2.

#### SatanSkin

##### Member
Very nice! Taught me a little more. Thanks

#### uthungover

##### Registered
thorilan said:
see the thing is you cant define a quantity of heat without giving a time

Yes you can, heat is a quantity of energy.

Q is just a confusing symbol to use in this equation because it means dQ/dt = power.

Otherwise, great post.

#### Gulinborsti

##### Registered
I really miss the "bigger is better" message ;-)

Nice summary :thumbs:

#### pauldenton

##### Member
Como said:
"Is the BTU a popular unit in Japan"

btu = brittish thermal unit.
i couldnt resist

nice post. if i understood more i'd probably have a question about it...i have a feeling it will mean mre to me in a month or 2.

one British Thermal Unit [Btu] is the amount of heat required to raise the temperature of
1 pound [ lb.] of water 1 degree Fahrenheit.

http://www.simetric.co.uk/sibtu.htm

in the UK it's only used with reference to obsolete equipment (boilers etc) - current equipment has to be specified in SI units (by law)

i doubt it's a popular unit anywhere outside the USA, which is about the only place where pounds and fahrenheit are still in (official) use

OP

#### thorilan

##### Member
removed by me thorilan

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#### Xenocide

##### Member
very informative, has my vote for a sticky

OP

#### thorilan

##### Member
i think eobard is on a real life vacation atm =(

#### eXCeSS

##### Member
my vote for sticky
nice post learned a lot

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