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ArcticMyst Security by Avery

Best Way to Get Rid of 50W of Heat

Meatball

Meatball

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^^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. :)
 





Cyparagon

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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. :p
 
C

cilegray

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Cyparagon said:
^note, that's 4186 Per kilogram (or approximately one liter) of water. That is kind of a lot, unless this is in a backpack. :p
Click to expand...

Exactly one liter, that is.

1 gram = 1 cm^3... 1 liter is 1000 cm^3... which is exactly 1 kilogram.
 
Wolfman29

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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?
 
jeffreythe00

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Wolfman29 said:
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?
Click to expand...

Because walking around with a laser attached to a backpack ghostbusters style is awesome? :D
 
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flare09

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Muahaha oh guys...I need to finish my build so badly...half way guys...im half way done...
 
justinjja

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You wouln't have to use a back pack for water cooling,
You can get 80mm radiators... and fairly small pumps as well...
 
LaZeRz

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Strap a small inter cooler from a car to it, that would work :p
 
Wolfman29

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=p I may just try a huge hunk of copper (make the whole thing on a copper slab =p )
 
vk2fro

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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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nouthyella

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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.
 
Wolfman29

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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.
 
StridAst

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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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