Pic`s of Evap. Design

[MartO]

I`ve been reading some post`s and I finally decided to go with this design, because it`s very easy to make (only a lathe) and it seems that it performs very well.

http://www.pretensada.tst.cl/Evapo.jpg
-->THIS NUMBERS HAVE NOTHING TO DO WITH THE ONES I NAME A BIT DOWN IN THIS POST<--
http://www.pretensada.tst.cl/Evapo2.jpg
BLUE = Capillar /// RED = Suction Line /// Green = Just a Hole

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But I have some doubts here, hope you "gurus" can help me.

The evap has 2 chambers, one with the heatsink (1) and the other for the gas expansion (2), right? But the capillar goes thru the chamber nº2 and it realease the liquid/gas in the chamber nº1 right?

Then the liquid evaporates into gas and it pass through the green hole (1 hole or more?) to the second chamber where the suction line is sucking everything back to the compressor.

Is this correct?

Also, why it`s better to have the capillar inside the suction line?

Bytes!!

[Russell_hq]

I dont think that there is much point in having the top section. Have a look at my evap;

Pic 1 (http://www.russellpetrie.plus.com/images/evaporator/evap1.jpg) ;Pic 2 (http://www.russellpetrie.plus.com/images/evaporator/evap2.jpg) ;Pic 3 (http://www.russellpetrie.plus.com/images/evaporator/evap3.jpg) ;Pic 4 (http://www.russellpetrie.plus.com/images/evaporator/evap4.JPG)

All I used was a Lathe, drill and hacksaw.

You might need to turn the brightness up to get a clearer image of the evap.

Since the refrigerant condenses to a liquid at room temperature and evporates at a much lower temp then its a good idea to bring the liquid temp down as close as you can to the evap temp otherwise you use some of the cooling potential of the evaporating refrigerant to bring the temps down. So running the cap tube through the suction line allows the cold suction gas to cool the liquid down inside the cap tube thus increasing the cooling capacity making design more efficient.

[MartO]

Ok, so the top section it`s useless?
I`ll try to make an exact copy of your evap then ;)

I understand the "thing" about the cap. tube.

I`ll pass the cap. tube trough the entire suction line, from the beginning in the evap. to the end in the compressor.

Also, the cap. tube inside the evap, need`s direct contact with the heatsink (bottom piece)? Or just need to be close?

Regards!

[Russell_hq]

It doesnt have to touch as it will just be spraying liquid into the evaporator. The liquid will be evaporating on the heatsink and that will bring the temps down.

You might also want to change the hole position for the suction line to the side of the top instead of the center as this will provide better flooding of the evap, this is seen in the prommy design.

[MartO]

I understand...

But if I don`t have the second chamber (top) what stops the suction line to suck even the "cold" liquid?

Regards!

[baker18]

Russell_hq


How is your evap performing for you? What temps are you getting?


baker18

[Russell_hq]

It performed well, I remember the temp fluctuations between full load and idle were not more than 5ºC max. I had problems mounting and insulating and broke alot of cores and a mobo also died on me, so I have stopped for a while to let the funds build up again and think up some new ideas.

Got this nice pic from it though. :)

http://www.russellpetrie.plus.com/images/cpu/3ghz.jpg

Thats propane power!

[MartO]

So, it`s a well performing design but it has it`s troubles right?

Why the mounting/insulation problems? Can you be more specific?
Cause i`m a complete noob in Phase Change and I don`t want to crush some cores nor motherboards :rolleyes:

Regards!

[Russell_hq]

I just didnt set it up right, too eager to just stick the evap on and bench.

Just ran a test with the evap head in a cup of propanol and it took it down to -40ºC and the propanol was still very runny but not smelling alot which was good.

Did you know propanol's melting point is -126ºC and boils at 98ºC compared to -98ºC and 65ºC of methanol. I would assume that the propanol is less volatile at room temps compared to methanol meaning less stink.

Anyone ever used it in a chiller application?

You can find out more properties from this database.

Database of Organic Compounds (http://129.219.157.125/)