"Dummy" heat load, any ideas?

[gkiing]

I would like to have a way of testing my direct die systems without having to hook them up to an actual cpu, anyone have an idea of how I can do this (yes i've already considered the TEC option). I was thinking of converting something like a large soldering iron into a heating element that could be attached to the block. Bowman has used industrial heater slugs (essentialy large resistors that put out 100w of heat) in a copper spreader to simulate a heat load, but I was unable to find anything of this sort at my local electronics store.

I'm sure there's probably a simple solution to this but I haven't found it yet.

@pcice - what did your heatload tester come from?

[chilly1]

I use a solid copper block with three 100 W resisters in it and it is completely insulated and mounts directly to the face of the block. The resistore can be wired in series or parrellel

[reject]

that sounds cool, i was thinking of a 100w lightbulb bhind a copper plate

[gkiing]

I use a solid copper block with three 100 W resisters in it and it is completely insulated and mounts directly to the face of the block. The resistore can be wired in series or parrellel

Where'd you buy your 100w resistors? Are they available online?

[chilly1]

Got them on EBAY for 8.00 they are wire wound resistors in a stainless tube.

[lalPOOO]

Offtopic: I think they used those things on older dryers... I recall being shot with something like that a couple years back (overheated or was miswired and shot about 10 feet across the room and burnt through my pants and burnt a little line in my leg)
Lesson learned, when your dad says "hey come look, i got it working" watch out.

[chilly1]

No these heaters are 100W and 3/4 inch llong with 1/4 inch diameter.

[gkiing]

I looked around ebay but couldn't find any 100w round heatercartridges that weren't huge, but I did see two 100w resistors that could be bolted to a heat testing block, would that work? What's the difference between a 100w 5ohm resistor and a 100w 8 ohm resistor (for example)?

[Epsilon]

Only the resistance

Do you want to use them on 12v?

Then you would need 100W/12V = 8.333A
12V/8.333A = 1.44Ohm Resistors (1.39 or 1.5 for example)

Good luck

[Sley_Face]

Aquarium heater?

[gkiing]

I'd prefer to run them on 120v ie 2x 100w heaters @ 120v each.

[quintus]

''Aquarium heater?'' depends of size and shape mine is like 2cm diameter 40cm long so u must improvize somethings so is not good i say.

What about a hairdryer?

Personaly i will go with the TEC

Edit: for the dryer, put a coper cooler like thermalright with tha side that is suposed to stay on the cpu on the evap yes that side on the evap and then put the dryer to blow on the other side! I dunno if its works, happy if some1 will try it and give me a pm or post it here!

[Aphex_Tom_9]

i used a TEC for that once...

[gkiing]

I actually did do the hairdryer method a few days ago.. pointed it on low at a heatsink attached to the evap. The problem is the hairdryer puts out 1500W of heat, lol. I need something a little bit less powerful.

[quintus]

I actually did do the hairdryer method a few days ago.. pointed it on low at a heatsink attached to the evap. The problem is the hairdryer puts out 1500W of heat, lol. I need something a little bit less powerful.

hahaha now i realize that i never use the hairdryer but cant u set it to lower speed the hairdryer's fan so that the wattageis lower? 750w lets say, lol 1500W!!!

Anyway the peltier is the thing to use!

Ps what ?hp compressor will remove lets say 750w at -40c lets say? 1, 1/2? thx

[chilly1]

Bowman sent me some resistors, both were 100W dean surface mount resistors, a little hard to mount but once done could be insulated and attached to a processor for accurate heat loads.

[Epsilon]

Bowman sent me some resistors, both were 100W dean surface mount resistors, a little hard to mount but once done could be insulated and attached to a processor for accurate heat loads.

I hope you mean "to the cooling system" instead of the processor

[Marci]

Hotside of 174w 24v TEC attached to prommi head. Maze4-1 Waterblock with coldplate removed attached to coldside of TEC. Warm water pumped thru cold side.

Voila. Approx 150w (I think!!) load simulator (just keep the water at as constant a temp as possible)

[froudeg]

I use wirewound clad resistors, only rated for 20 watts but I run them over 100 watts....remember the power rating on such resistors is with ambient temperature cooling, when attached to a phase change setup you can easily push these smaller resistors to 100 watts. I've added a thermal trip that stops them burning out if the temp gets too high.

I prefer to use such smaller resistors as it more accurately simulates the concentrated heat output of a cpu, and gives you a more accurate load capacity reading - even insulating up your load block still results in some of the heat being lost as thermal radiation, so the smaller the block the better.

[froudeg]

Peltiers don't make accurate loads, in a basic DC connection such as that, as their power consumption changes by as much as 30% depending on their hot and cold side temp's.

However they can be made to give very accurate heat outputs with monitoring circuitry and PWM power modulation.

[PMM]

Made my own heatercore & a friend helps make the critcal part that completed it off.

Rated against the powersupply I intend using I'll have about 400Watt on tap all in a 1" by 2" core.

The rest i'm afraid is not for show as this is a do it all test die simulator
any heatsink/waterblock or phasechange and accurate simulation of core
height for pressure purposes and effects when pressure is increased.

Tested to 65W and hit 220C bare wired up with cable that withstands 800C
not per the pics below thats just standard heavy duty and it melted anyway lol :chuckle: