Dehumidifier questions

[m0tion]

Is there any problem with running -40C liquid through a regular Eheim 1250? Anything special that need to be done to it? Will it shorten the life-span?

Also, is a 15-pint dehumidifier strong enough to run a chilled water system with?

[NorthernYankee]

First off welcom to LN.

As for the pump it should be ok but I am not sure if you will be able to use -40 water as the antifreeze to water ratio would negate any benefits of the water being that cold.

As for the Dehumid. it may be big enough. I am not really sure it depends on the compressor.

--NY

[dicki]

it depends what you'll be running in the pump...

i will be playing with some goo thats safe down to about -20 but at -30 it has the consistancy of golden syrup which would destroy the pump... you'll have to research your cooling fluid very carefully because just using antifreeze won't work as it doesn't move heat very well... some form of alcohol might do it but alcohols are very thin and could leech out of the system. i'd like to know what you decide on in the end and how well it works. also insulation will be vital to keep the liquid cool and to stop condensation... personally if i were super cooling like that i'd submerge the whole thing in nonconductive oil and then pump super cooled stuff through the water block like your planning at the moment... that gets rid of all the waterproofing, insulation and condensation issues

dicki

[Player0]

As said before, it depends on the liquid and its viscosity at -40c. But the temperature itself wont be a problem. The plastic impeller wont get too brittle to function until probably -80 to -100c.

As for dehumidifiers, never seen on used. But im sure they dont have as powerful of a compressor as a fridge/aircon unit.

[m0tion]

Ok, here is a thought (I know it might sound kind of far-fetched at first, but hear me out). Could I make my own phase change cooling unit? I'd need a compressor, 2 radiators (one for low presure (cold), one for high presure (hot)), tubing (would this work? or would it need to be copper piping?), and an expansion value (basically something to connect the piping together that has a small opening). I could use pure ammonia for the refridgerant, my only question would be, how do I fill this thing? It needs to be a vaccum right? no air?


Again, it sounds kind of crazy at first, but I think it could be done with some effort. The whole reason I bring it up is I'm having a difficult time finding a smaller dehumidifier with a strong compressor...

[Player0]

m0tion...its certainly possible to build your own refridgeration unit, but I recommend finding a prebuilt system. Pure ammonia is extremely dangerous, and you probably can't get it.

[tripodal]

there is no flexible tubing i know of that you could use... refrigerant systems use up to 300psi, and the typical coolant, freon is much thinner than most air... the best way to "charge" the system... is to creat a vacume in the system after it is assembled.
1. you need to have fittings that can seal the system when it is not in service so that you can add / remove the coolant
it is a hazardous material

2. your system will need to be able to withstand the full vacume of the machine for a mininum of 30 minutes before you even think of charging it. if there is a leak, you are violating the law.

3. finding and bending the pipes will be fairly easy.. similar to bending brake lines (which may also work) you will need a tubing bender which is a standard tube.

if you did go to all this effort you may just want to run a water block into the evaporator .. as in the vapochill system...

if that may not work ... you should be able to find a liquid to cool with the evaporator.. perhaps a closed loop of transformer fluid.


i was a certified auto AC technician before i started oc'ing my computers

[m0tion]

Wow, thanks for the info!