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Wanted: Constant heat source
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Old 16th June 2002, 23:56   #1
beki
 
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Default Wanted: Constant heat source

I'm looking for a constant heat source 'cause I want to test some memory heatsinks (alpha, thermaltake and some Brico stuff). Or do u guys know another way of testing these things?

(I have a copper colplate with a thermal sensor in it and I want to put he HS on one side and the heatsource on the other and the lowest T should show which HS is the best.)

I just want an idea of what to use I don't want to buy it here so don't move this to mad bargains
 
Old 17th June 2002, 03:21   #2
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mini-heat cookplate? ones you can take on a holiday trip.. should do fine no?
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Old 17th June 2002, 07:44   #3
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that's to big, and I think it gives of to much heat for those little HS's
 
Old 17th June 2002, 08:25   #4
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a small thealight perhaps?
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Old 17th June 2002, 10:09   #5
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could try that but I'm looking for something electrical so you really have a constant source. (T-light changes when there's more wind & stuff)
 
Old 17th June 2002, 10:41   #6
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cookplate has different settings, I'm sure lowest setting comes very close to processor heat output (check XP egg baking )
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Old 17th June 2002, 11:24   #7
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I saw on GoT that someone made a heatsource especially for this purpose, with adjustable watts i think.
Didn't look to hard to make and not expensive
Unfortunately I don't remember the topicname, search would help in this case
 
Old 17th June 2002, 13:06   #8
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hehe funny

it's plain simple.

1st how many watts of heat do you want to stun the heatsink with?

lets say 10 watt wich is much for some mem.

what we need: a 10 watt resistor, a psu or 12v source

lets calculate the resistance we need.

P=U*I
(power = voltage * Current )

now we put in the numbers

10=12*I

=> I = 10/12 or 0,833333 Amp

now that we have found I we can use Ohm's law

R= U/I

R = 12/0,83 => 14,5 Ohm

now head over to your local electronics shop and ask for a 10 watt resistor with nearest value to 14,5 ohm apply some thermal grease and you can start measuring.



===

another how-to: calculating thermal resistance of a heatsink
example: 5k/w wich means temps rise 5 Kelvin per watt heat applied.

a temp rise is called : Delta T
a rise of 1 Kelvin = a rise of 1 c to keep it simple

now with above 10 watt heater, you can measure temps

lets say ambient temp = 20c
heatsink temp with 10watts heat applied = 40c

so delta T = 40-20 = 20C

now we can calculate

delta T / wattage = thermal resistance

=> 20/10
=> 2C/watt

the lower this number the better

hope you can understand it
Will make website soon with pics'n stuff to brighten things up :P
 
Old 17th June 2002, 13:20   #9
beki
 
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That's what I needed thx
 
Old 17th June 2002, 14:22   #10
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Quote:
Originally posted by Anthroplast

Will make website soon with pics'n stuff to brighten things up :P
feel free to submit any content to /me mail address and I'll make it into a howto on the madshrimps site!
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