New project -> -100*C CO2 AutoC

[Brettbeck]

No problem, as long as you dont rush it! Unfortunately, im back at school tomorrow .

[Marvin_The_Martian]

Tomorrow big day Today I don`t have time

It's looking very very good luke, looks sweet, when you ship my ss now please make the mistake to ship this one

[LukeXE]

It's looking very very good luke, looks sweet, when you ship my ss now please make the mistake to ship this one

Hehe

I`ve got a small leak on suction line, but I repaired it few minutes ago, I`m revacuuming it now, at 17 I must go to driving lessons, and at the evening I will charge autoC and will (I hope) show some nice temps

so, stay tunned

[LukeXE]

Ok, few photos







HX temp:



Unit totally naked, so the temps aren`t extra low, -25*C HX without insulation is good for me

tomorrow my girlfriend will go to A/C shop and buy some insulation (I must go to school :p) and I will insulate whole unit.

[n00b 0f l337]

Luke pop me a message when your around.

[LukeXE]

Insulated

Evap temp at 0,3bar suction pressure (4PSI)





whole unit :




Phase Separator



SLHX before phase separator :





You wanna know HX temp ?




R290 + CO2













Frosted CO2 line after phase separator



I really have forgotten when charging, that I wanna do the lowest idle temp, I charged it with to big amount of gas and I have 0,3bar suction pressure, so about -100*C I can forget at this momment Tomorrow I will let some some gas out from the unit to make it running in vacuum.

I must say thanks to my girlfriend, she helped me today a lot, she went to the A/C shop for insulation (I can`t today) to city placed 40km (20miles) from our town thanks :*

[LukeXE]

Today I played a little bit with autocascade to make a lowest temp possible, I`m not lucky now, only -83*C.



I think I will end with trying to hit -100*C at this momment, I will charge it for load and try to have a good load temps.

[piotres]

Ha...I see mine Sanyo

BTW Quite nice looking and working auto-c

[LukeXE]

Ha...I see mine Sanyo

Where

This rotary isn`t yours, mine is 25%-30% bigger than that Sanyo Your Sanyo will work in next few days in nice unit

[LukeXE]

A little update.

I bought my first vacuum pump (160$, 2 stage, maybe it`s not amazing, but it will be a lot better than pulling vacuum by small compressor) ! I`m happy I will have it tomorrow, I will pull good vacuum now and fight with autocascade to hit -100*C, maybe now I will make it

[fatty]

Very nice work LukeXE I hope you hit your target with it

[johann]

Hey Luke, now I see why you wanted to come to London to be with your girlfriend

So London is not the place for her? She returned to you hehehe. Keep her happy its the most important thing.

Oh BTW, nice autocascade man, I take my hat off for someone that use what they have and then make such an awesome unit.

[Nosfer@tu]

Love how you make the units using as littel $ as posible

[LukeXE]

Thanks for nice words my friends !

[Brettbeck]

Looks really nice Luke .

I agree with Johann, its great to see people using parts they have to make such awesome units!

[LukeXE]

Little update

I vacuumed my auto-c with my new vacuum pump. Now auto-c has faster pull down and better temps !

I`ve got good ratio of gasses, -76*C@0bar suction pressure (no load yet), HX temp -35*C (R290)

give me ethylene !

[LukeXE]

New update

-65*C@155W dummy

will be lower

[jinu117]

Sounds great Luke Yup... pump does the job better eh? Time to get gauge for it now so you can consistantly know whats going on

[aasmaukr]

-65*C@155W dummy is pretty damn nice What pressures do you have now?

[LukeXE]

Sounds great Luke Yup... pump does the job better eh? Time to get gauge for it now so you can consistantly know whats going on

Yeap, pump is great. As you said, I must buy now vacuum gauge...but it probably will be expensive. Maybe you Jinu have one, used ? I don`t need new one.

-65*C@155W dummy is pretty damn nice What pressures do you have now?

Pressures :

15bar highside pressure
1 - 1,2bar suction pressure

[maverik-sg1]

Sorry for thread jacking here - if you speak to RAVEN155, please ask him to contact me ASAP - reason why I post here is that I see he is visting this thread and I hope that by posting here he sees this message or one of his friends see it and pass the message on for me.

[LukeXE]

OK

My server with photos is down at this momment :|

[Quasi]

How do you avoid the dry ice? when I try this - I get dry ice and don't manage very low temps - unless I immediately turn off the system and release the 290 and CO2 and then put it in vacuum - then the evap will hit -70 for the next 1/2 hour.

Anyway - the dry ice has been a problem for me.

[n00b 0f l337]

Work the PT chart to not allow dry ice

[Quasi]

I guess the triple point is getting me.