Electronics > Projects, Designs, and Technical Stuff
Thermal Management : How to go fanless in a small space?
daslolo:
I am doing cooling for a pair of FPV goggles, the initial design uses a blower which vibrates and doesn't cool enough.
Without fan, I tested with thermal camera which shows that temperature ramps up from 18C ambient to over 40C inside within 30 minutes then coasts at 41C.
The outer shell gets toasty at above 30C after 2 hours.
The main heatsource is the RDC100 from Raeon which cooks up to 61C when the top case is open, probably in the 70C when it's closed. The RDC is facing forward (away from the face).
Another heat source is sandwitched between the top PCB and the LCOS dispkays, it's covered with a aluminium plate, probably serves as a low profile heatsink.
I am planning on testing Panasonic SSM and PGS made heat pipes to move all that heat sandwitched in tight corners. I need to find a smart way to dissipating this heat PASSIVELY and would like to hear your advise.
Power consumption is 4.9V 1.6A. Des that mean I need to dissipate 8W of heat? How do I find out all the thermal parameters?
If you have telegram, there is more details as I go : https://t.me/EV200D
https://youtu.be/xnckMM-tqUw
SilverSolder:
Can the outer casing be made of aluminum? - it is a big surface, able to dissipate lots of heat, could have small fins etc. as part of some outrageous design...
OM222O:
you have to somehow get rid of the generated heat. if you think the fan was useless (not cooling enough) have fun trying to passively cool it (inside a closed enclosure at that!). There is simply no way around the laws of physics so your best bet is a better fan ... or water cooling if you're crazy enough (I've done a few water cooling mods on ridiculous things just for the hell of it :-DD)
Marco:
Just bodge a big black anodized heatsink on the front and connect the heat generating components to it with heatpipe or PGS graphite sheet.
daslolo:
--- Quote from: Marco on April 24, 2019, 12:38:00 am ---Just bodge a big black anodized heatsink on the front and connect the heat generating components to it with heatpipe or PGS graphite sheet.
--- End quote ---
Tomorrow I get the PGS and I'll test moving the heat outside.
I can cut a hole in the plastic case or even simply a slit and glue the heatsink on the outside of the case, the PGS serving as a sort of ribbon heat transfer.
What's the best heatsink material and fin shape? Or can PGS even be used to make one, like a PGS beard perhaps?
--- Quote from: 3roomlab on April 23, 2019, 11:18:15 pm ---lets see the insides, maybe there isnt space for any mods :-//
--- End quote ---
see photos there is loads of room for PGS or maybe even SSM.
--- Quote from: SilverSolder on April 23, 2019, 10:49:22 pm ---
Can the outer casing be made of aluminum? - it is a big surface, able to dissipate lots of heat, could have small fins etc. as part of some outrageous design...
--- End quote ---
It's a great idea, working aluminium is beyond my ability.
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