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Tec<-wc<-phase change? - Page 4

post #31 of 37
Thread Starter 
Quote:
Originally Posted by shurik06_83 View Post
a phase is not really a lan party thing unles the lan party comes to u

u can save on size and weight of the whole rig by looking for 12v compresors from mini fridges in motohomes and so on the compresors are usualy small and can probly fit the whole kit + computer in ATX Full-Tower but it would be best to get rid of the TeC and water cooling and just go with direct phase chnage will save alot of room

powering the compresor can be done by buying a cheap 12v battery charger http://www.canadiantire.ca/AST/brows...A%25252B2A.jsp
Read the whole thread. This is an experiment. I also am using a small compressor from a mini-fridge that will fit in my Full ATX case.
Plus this thing is only going to be around 15lbs heavier than what it would be without all the fancy cooling.
post #32 of 37
ok u got a compressor now u need a condensor http://www.under-the-ice.com/product...products_id=80 not the best but with 2 120mm fans push pull should do very nicely

now u really need to figure out if u want water and tec

200w tech is not cheap a psu for the tec is even more , what i am saying is for the $$$ u would drop on a tec and psu u can buy a alredy made cpu di evaporator and flex line wich will just need to be brazed to the rest of the stuff u have

if u also wana dabelin water cooling on this build u can scrap the condensor and build a water cooled one



that is a pic for a evap but can be turnd int to a condensor if u put the feed into where it sayse suction
Edited by shurik06_83 - 1/27/10 at 4:56am
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post #33 of 37
Thread Starter 
I already know what I need to do. Please read the thread because all of that has already been discussed. I am modding a 400W ATX power supply for my TEC power supply. a 235W TEC will run about $35. It's about $70(shipping included) for that condenser. Not too expensive. I'm also buying a used water cooling system from a OCN member for about $100. He has shown me the parts and I've looked them up, I think it's a great deal. I'm buying the water cooling system first. Then in about a month I'll be getting a new motherboard, ram, and cpu. After that I will get the TEC and all the insulating supplies. Then, last but not least, I will order the condenser and install the phase change system.
post #34 of 37
if ur dead set on a tec go with tec and direct phase cooling the tec

the water loop will just cause u to much loss

tec's most 200+w tecs are 24v so make shure the one u get is 12v

400w psu is 400w over all chanels meaning 12v 5v 3.3v and -12v

5v 3.3v is about 150w leaveing u with only 250w max that might not be enoghf juice

to be on the safe side u might want to go witha 550w or a 600w to give ur self some breathing room

now the tec will put out alot more heat then just what ur cpu is makeing if lets say u have a 130w cpu with a slight oc u will be pushing 150w the teck will suck that up and spit it out the other side along with the heat it genorates while doing that wich coulld be in the 300w+ so ur phase chnage will have to be built to take that load

so u will have to figure out how many wats the tec will spit out on the hot side after takeing the heat from ur cpu once u know that then u can begine building ur phase system
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post #35 of 37
Quote:
Originally Posted by DuckieHo View Post
TECs are generally rated in the maximum wattage it can move.


Using very off-the-top-of-my-head numbers...
If a 240w TEC is moving 240w, then it is probably consuming something close to 350-500w.

On top of a 150w CPU, that would be 500-650w.

so going by this a 120mm dinky condensor would be a bad idea a condensor out of a 10k btu a/c would be a good start

psu minimum of 650w would be needed to convert to power ur tec, 750w pus would be best option

1hp =to roughfly 700w work output so the mini pump u have would die rather soon so u need a 1hp compressor so going by this u my friend are in a market for a 10-12k btu window ac that should get u all the parts to get u started at around $50 out of the wanted adds

i am not trying to be mean i am just giveing u a heads up so u dont sink $$ into something that would die way to soon for u to get ur enjoyment out of it

and with a 1hp pump and a big condensor u will be aboul to cool the tec and get some crazy sub zero temps that only a cascade can doo

now all of this has got me thinking and maybe i shoul give it a go after i finnish my chiller oil bath
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post #36 of 37
Quote:
and with a 1hp pump and a big condensor u will be aboul to cool the tec and get some crazy sub zero temps that only a cascade can doo
Please do more reading, I dislike having to follow in your wake.
This is totally wrong.
TEC's do not scale down that low, and neither does he need a 1hp compressor.
Quote:
1hp =to roughfly 700w work output
Those terms have no relationship.
post #37 of 37
I have no idea how your going to be using the TEC but it really makes no difference like NOL said the TEC wont help your Phase at all whilst TEc can match phase for COP at the same COP the phase will go much colder. TEC and certainly single TEC units cannot generally go lower than -20ºC / -25ºC due to the number of variables affecting their performance. Even to reach that point will require you to understand Dt, Q and hotside cooling and you wont achieve it by just installing the TEC with the standard methods. Just the ambient temp. in the case will prevent you from achieving this. This point will also only be at CPU idle when your CPU runs in earnest it will fight your phase tooth and nail and the coolant will rise in temp in time , if not straight away.
I don't really think a TEC can be of much use in the same project as phase.

If the TEC is on the CPU and your using the cooled coolant to cool the hotside it might not have quite the effect your thinking the extra cold hotside will reduce the Dt which in turn will increase the temperature of the coldside and consequently reduce the amount of cooling you get i.e. there is a point where cooling the hotside has diminishing returns, especially in a high ambient like you will have in a PC case.

It is possible by reducing the Dt sufficiently to get negative Dt where your TEC wont be cooling at all....I don't think you will be running at low enough power but if you were running the TEC at low power with a high load and excessive hotside cooling since all of these things reduce Dt it would be possible to achieve negative Dt....super cooling the hotside has diminishing returns. That is why TECs cant generally get very low - low temps are more achievable with multiple TECs.

Shurik....sorry but that quote from the TEC section by DuckieHo was incorrect so by repeating here you are incorrect....
Edited by zipdogso - 1/28/10 at 5:52pm
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