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|16th June 2002, 23:56||#1|
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
|17th June 2002, 10:41||#6|
Join Date: May 2002
cookplate has different settings, I'm sure lowest setting comes very close to processor heat output (check XP egg baking )
|17th June 2002, 11:24||#7|
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
|17th June 2002, 13:06||#8|
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.
(power = voltage * Current )
now we put in the numbers
=> I = 10/12 or 0,833333 Amp
now that we have found I we can use Ohm's law
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 = 20°c
heatsink temp with 10watts heat applied = 40°c
so delta T = 40-20 = 20°C
now we can calculate
delta T / wattage = thermal resistance
the lower this number the better
hope you can understand it
Will make website soon with pics'n stuff to brighten things up :P
|17th June 2002, 14:22||#10|
Join Date: May 2002
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