Air Conditioner make PC go Brrr

[Kilrah]

10 hours ago, ShrimpBrime said:

The compressor is too small.

More like too big.

If the AC is meant to have 3kW of cooling power then when the compressor runs at full power the loop needs to find 3kW of heat to suck before returning to the compressor to evaporate everything and not have it flow back as liquid, and that's WAY more than the CPU/block will be giving it.

 

If it was me I'd get rid of all the electronics and connect the motor to an external VFD (Aliexpress is your friend, i.e. for CNC spindles) so the speed can be varied manually without interlock shenanigans. More importantly I'd put the original evaporator in the loop after the CPU block to evaporate any remaining liquid. If it gets too cold it means there's too much capacity, reduce compressor speed. And add a proper valve before the CPU block to adjust the flow optimally instead of the janky pinched tube. If your refrigerant stays liquid inside the block and evaporates further down the line it's of little use towards the goal.

 

 

 

[Guest]

8 hours ago, Kilrah said:

More like too big.

If the AC is meant to have 3kW of cooling power then when the compressor runs at full power the loop needs to find 3kW of heat to suck before returning to the compressor to evaporate everything and not have it flow back as liquid, and that's WAY more than the CPU/block will be giving it.

 

If it was me I'd get rid of all the electronics and connect the motor to an external VFD (Aliexpress is your friend, i.e. for CNC spindles) so the speed can be varied manually without interlock shenanigans. More importantly I'd put the original evaporator in the loop after the CPU block to evaporate any remaining liquid. If it gets too cold it means there's too much capacity, reduce compressor speed. And add a proper valve before the CPU block to adjust the flow optimally instead of the janky pinched tube. If your refrigerant stays liquid inside the block and evaporates further down the line it's of little use towards the goal.

 

 

 

Like I said there... a Lot of time and money. For not impressive temps, even on properly built single stage. Even more wasted power for a cascade, probably hit -60c or so. 

 

Nothing more than a fun project in my honest opinion. Even for benching, just can't bring myself into it. I work with refrigeration often, on the intended application. It's just not cold enough for me. Not for the $$ and time put into it.

 

_____

For like 12$ can hit -20 to -30c.

 

Peltier cooling. (which would be a cool video, but this screen shot is on modded hardware *de-lidded & plated* and chilled *geothermal* loop 8c water delta.)

Oh, there in my avatar. <--- That would be the naked 2700x, larger cold plate *ihs is too small* obviously the peltier and water block.

 

 

Spoiler

Edit:

Here's a pic with a larger yet cold plate, not the one in the avatar. 

 

Spoiler

 

[cachethrash]

On 12/1/2021 at 11:24 PM, Bitter said:

So why not dunk the board in oil to beat condensation and water on the block and board?

Or maybe submerge the whole system in some kind of mineral-based oil...

[sub68]

You know its good video when @BrianTheElectrician shows up