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Old 05-14-2012, 07:59 PM #17
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Default Re: Best Way to Get Rid of 50W of Heat

^^By measuring voltage across a .001 ohm resistor.

I would vote for water cooling. It has the most heat capacity per unit volume in this case. Think, for some 4000 Joules of heat transferred to the water, the temperature is raised 1 degree.

So.... 50 J/s would raise the water temperature one degree every 80 seconds of operation time. All the rest is up to your duty cycle and battery's capabilities.


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Old 05-14-2012, 09:15 PM #18
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Default Re: Best Way to Get Rid of 50W of Heat

^note, that's 4186 Per kilogram (or approximately one liter) of water. That is kind of a lot, unless this is in a backpack.
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Old 05-14-2012, 10:22 PM #19
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Default Re: Best Way to Get Rid of 50W of Heat

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^note, that's 4186 Per kilogram (or approximately one liter) of water. That is kind of a lot, unless this is in a backpack.
Exactly one liter, that is.

1 gram = 1 cm^3... 1 liter is 1000 cm^3... which is exactly 1 kilogram.
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Old 05-15-2012, 01:33 AM #20
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Default Re: Best Way to Get Rid of 50W of Heat

Naw, I am set on this NOT being a backpack. Want this to be a standalone thingamajig. My batteries will only last ten minutes, so why would I want a huge backpack with it?
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Old 05-15-2012, 02:03 AM #21
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Default Re: Best Way to Get Rid of 50W of Heat

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Naw, I am set on this NOT being a backpack. Want this to be a standalone thingamajig. My batteries will only last ten minutes, so why would I want a huge backpack with it?
Because walking around with a laser attached to a backpack ghostbusters style is awesome?
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Old 05-15-2012, 02:39 AM #22
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Default Re: Best Way to Get Rid of 50W of Heat

Muahaha oh guys...I need to finish my build so badly...half way guys...im half way done...
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Old 05-15-2012, 03:03 AM #23
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Default Re: Best Way to Get Rid of 50W of Heat

=p Well, yeah, but still!
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Old 05-15-2012, 04:11 AM #24
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Default Re: Best Way to Get Rid of 50W of Heat

You wouln't have to use a back pack for water cooling,
You can get 80mm radiators... and fairly small pumps as well...
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Old 05-15-2012, 04:45 AM #25
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Default Re: Best Way to Get Rid of 50W of Heat

Strap a small inter cooler from a car to it, that would work :P
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Old 05-15-2012, 04:46 AM #26
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Default Re: Best Way to Get Rid of 50W of Heat

=p I may just try a huge hunk of copper (make the whole thing on a copper slab =p )
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Old 05-15-2012, 06:36 AM #27
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Default Re: Best Way to Get Rid of 50W of Heat

I'd use A123 cells - these are heavier than LiPo 18650's, but they are a lot safer. Especially when strapped to a body part :P
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Old 05-15-2012, 06:39 AM #28
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Default Re: Best Way to Get Rid of 50W of Heat

I am using A123 18650s
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Old 05-15-2012, 01:08 PM #29
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Default Re: Best Way to Get Rid of 50W of Heat

I still think the heat dissipation will need at least a CPU HSF if you don't want to cook you arm. You are basically putting out the equivalent of an average CPU of heat, so it follows you will need something to cool to the same extent.
You will also need to consider the contacts, unless you can somehow make your diodes direct-pressed into the copper slab, you are going to have trouble with heat dissipation from diode-slab.
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Old 05-15-2012, 02:47 PM #30
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Default Re: Best Way to Get Rid of 50W of Heat

This is a diode array and it has built in screws so that I can screw the bar down = So essentially, yes, I can directly "press" it in.
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Old 05-15-2012, 03:14 PM #31
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Default Re: Best Way to Get Rid of 50W of Heat

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Exactly one liter, that is.
If I would have said exactly, someone would have complained about thermal expansion, pressure, impurities, etc. I can't win.
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Old 05-16-2012, 03:17 PM #32
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Default Re: Best Way to Get Rid of 50W of Heat

my 2 cents on this. If you are looking at making this into an iron man style palm thing, would 2 tubes coming off the palm unit be a bad thing? i.e. bolt the diode bar to a heatsink, which has a hole drilled through it, two tubes circulating water in one side and out the other of this part, and run up your arm, down your side to a belt unit which has a fan and another heatsink and a small pump. (wouldn't hurt to have the batteries there as well) the water circulates from the pump, up one tube, through your palm unit heatsink, and down the other tube to your main heatsink which has the fan cooling it. you could even break the belt unit part up into several smaller heatsinks to make it less obtrusive if you wanted. Shouldn't be that hard to do to make it work.
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