Tim worklog

[tim-]

this is atleast a beginning.
I started build a singlestage unit on a aspera nek2134, a small 3/8hp r404compressor but it didn't satisfie me, tvx wasn't the thing for singlestage and didn't perform as good as I wanted.

After a couple of months I had enough and started on this one.
Now, I'm building a new unit.

some data:
compressor: toshiba PAX150x2T-4FM1 r410a rotary, input 1500watt.
condenser: 6rowx6row condenser with papst 220v AC fan.
controller: ECD AC fan controller with startup loop with RFI suppression and fan speed adjuster depending on tempture. condenser temp adjustable.
tubes:
3/8" discharge
½" suction
3,2m of 0,31" captube
evap: homemade stepper with suction in bottom, custommade mountingkit will be milled.

refrigrant:
r290 to start with. later it will be r410a or r507/r404 depending on what I can get in touch with.

some pics:

http://goto.glocalnet.net/timedlund/1.jpg
unit, almost finished, cap tube is still missing (yesterday)
http://goto.glocalnet.net/timedlund/2.jpg
Argon, sweet argon, makes the brazing clean and nice.
http://goto.glocalnet.net/timedlund/3.jpg
today, cap tube arrived and I've brazed it on suction. it's 3,2meters and will proberbly be shorter tomorrows after some tuning with 200watt load.
http://goto.glocalnet.net/timedlund/4.jpg
made a plywood plate outside the garage 'cause of the wheater was good enough to be outside. drilled 3 holes for T-nut (correct word?) for mounting the rotary. I also drilled a 44mm hole for the bottom of compressor.
http://goto.glocalnet.net/timedlund/5.jpg
Overwiev of the unit, pretty small 530x230mm / 21,3x10,5" but it's high, 43cm/ 17". those damn rotarys is really high, but this is quite massive 1500watts!!! will use same for cascade later.

It's pressure tested with succes and will be evacuate tomorrow and adjustments with cap tube will be done.

Regards
Tim

[n00b 0f l337]

Heh, 3.2m of capillary?
I think that sounds quite long, but as they say, easier to trim then splice.

[Nosfer@tu]

Very nice Build :D

fill in where you live, that way people know if you are close :D

[n00b 0f l337]

Very good looking build there. Nice and clean electronic work/.

[runmc]

Very good Tim - you should get some good temps with that set-up I think your smart to start with 3.2m cap tube - maybe it is perfect.:D

[Shalamay]

What temps are you expecting?

[tim-]

thanks everybody!

n00b 0f l337 & runmc:
i think this unit will have a little bit longer captube then most of the singlestage unit's 'cause of the capacity of compressor. I'm new with captube so it will be some testing before I get it right. I will let you know later what lenght the final captube will be!

shalamay:
with r290 i expect atleast -45c @ 200watt load.

with r404 -50 and r410a atleast -55c. but I havn't any of those two gases home right now so I aim on get lowest temp possible with r290 first and then if I will be able to play with something better I will proberbly do that.

tomorrow I will glue my new loadtester and post the results. I'm also going to mill a mounting kit to get use of this unit ;)

what sandpaper do you guys grind the evap head with?
I've done 1200grint and I'm not sure how much more that's necessary.

[runmc]

I've done 1200grint and I'm not sure how much more that's necessary.

I would say that was plenty :)

[teyber]

lookin good! look forwards to trackign this one.

[n00b 0f l337]

Can't wait to see results :) The unit just looks so damn freakin good

[wdrzal]

A company used to make 2 different ways of connectng/shortinging cap tube without brazing, they no longer makes these parts. when I have time I'll see if I can come up with a method & parts list that everyone can use out of standard parts.

[gosmeyer]

^ I for one would certainly appreciate that.^ :clap:

[potkit]

A company used to make 2 different ways of connectng/shortinging cap tube without brazing, they no longer makes these parts. when I have time I'll see if I can come up with a method & parts list that everyone can use out of standard parts.

so with no brazing you mean there is no need to take all the gas out? coz the brazing part is not a problem, the thing is that you have to recover the gas, open the circuit, braze, vacuum, charge.
cant wait to see it

[Shalamay]

Thats some nice sounding temps you're expecting, can't wait to see what it does.

[Brettbeck]

Nice job there Tim!



what sandpaper do you guys grind the evap head with?
I've done 1200grint and I'm not sure how much more that's necessary.


1200 grit and polish works good :)!


T-nut (correct word?)


I think you mean bolts? I use set screws and bolts to mount things to the base... with washers where needed.

[tim-]

thanks everybody!
but I have some bad news, I was going to test the unit today with 200watts load but it wasn't that easy! no testloader arrived, they had order wrong parts from storage and now I have to wait for tomorrow (wednesday) until I can push the unit to max.

But I'm looking forward to it. I charged it a little with r290 today just for fun and the vacuum comes really quick as the tempture so I think this will be really good. I just hope I don't have to make the captube longer 'cause I don't have any recovery unit at home and it isn't that good to release propane out in workshop while brazing..


brettbeck:
http://www.woodpeck.com/media/main_tnut.jpg
i've using this kind of nuts which i've screwed the bolts in, I've checked it, it is called T-nut as i thought.

[Brettbeck]

Oh right I see now :). I haven't used anything like that before.

[tim-]

Hi again!
I have been benching now for an hour or so and I'm stuck need to adjust captube.. but guess what, I need it longer :shocked:

totally mad, the compressor won't get down in vacuum enough.

http://goto.glocalnet.net/timedlund/DSCN0119.jpg

this tempture is with optimal tuning of gasvolume. idle tempture is -47c.

now we are talking about MAD SS with r290! dont forget that :D

[edit]
forgot the most importent thing 200watts of load!

[Shalamay]

Nice temps with that load.

[tim-]

I promised some captube adjustment and some new benching.
I think I'm on the right way

r290, 200watt load as earlier.

http://goto.glocalnet.net/timedlund/8.jpg
yes, it's under load
http://goto.glocalnet.net/timedlund/9.jpg
the system

[4Qman]

Very nice build dude.

Do you plan to use another refrigerant. Would like to see some R402a in there dude :)

[[XC] gomeler]

Would be interested in how many watts that system is pulling while under load. Nice temps there :)

[tim-]

I did some other adjustments, i saw I got to high discharge pressure so I did take a bit of the refrigrant out and voila.

http://goto.glocalnet.net/timedlund/10.jpg

I'm sceptical, does those load testers really work proper in -63dgr? i can see it's really hard for my smaller units to handle this kind of load. But this unit doesn't seems to change tempture that much between load and idle, max 2c.

is it just to accept that this unit is strong as hell or do you guys think those heat loaders doesn't work that good in colder temptures?

4Qman:
r402 isn't legal to use in sweden 'cause of the odp/gwp factor, honestly I don't know what's bad with r402, just that I don't are allowed to use it, which makes it impossible to get here to so I have to find something else that works.

r404/507 is a good idea as r410, compressor is made för r410 so it will be okay. Question is where I should get it as I don't have the permission to buy those refrigrants.

[krullet]

ye tim realy nice temps ut got, god job..

ill hope we get to se much more units

[4Qman]

is it just to accept that this unit is strong as hell or do you guys think those heat loaders doesn't work that good in colder temptures?


People use the Heat loaders to test cascade so they do work colder than the temps you pose. End of the day depends on the quality of the Load Tester ;)

[Dualist]

Amazing temps there tim- on a SS, nice one dude :up:

[n00b 0f l337]

Is your heat loader iced up?

[Pansuu]

Realy hard to belive those temps in that load, or the meter is in suctionline :D

Otherwise..r410 rotarys are wery powerfull. How hard vacuum is in lowpreasureside, those temps?

[n00b 0f l337]

Yeah temps dont sound real honsetly.

[Shalamay]

pretty nice results!!!

[tim-]

n00b 0f l337 :
as i said, i was also confused about the result of -63 degrees.. and it's confirmed.. the new load tester wasn't in good shape, it was something bad with it or wrong on the loadtester.. wrong resistans.

was badged with 200watt but it wasn't more then 125watts when i put the power meter on it. I guessed it was too good to be true.

my old "smaller" load tester is 161watts and shows 158-165watts.

The new loadtester will arrive on monday!

regards
tim

[Nosfer@tu]

Can you droop some links to Load testers ? :D

[tim-]

well it isn't a complete loadtester it's just the part that makes the heat.. just lost the word.. perhaps someone knows what those parts is called in english.. resistor?

[Eternalightwith]

Resistor :yepp:

[teyber]

still tho ugh, -63c on a ss is pretty nuts.
I know you listed the compressor, but im a noob to phase, so can someone convert that to HP? thanks.

looking forwards to seeing the load temps!

[n00b 0f l337]

Odd, 1500 watt input (if your sure thats it) would be around 2hp. Hell of an overboard setup.

[tim-]

yes it's 1500watts input, but I don't know if you rate compressor power of input power or output power.. therefor I don't say anything about the HP rating..

if you calculate hp rating by input power it is a 2hp compressor.

[Clemmaster]

@7.2° with R410a (do never compare with LBP ... 7.2° and -23.3° aren't the same at all, the power consumption neither)

[tim-]

I promissed a update.. and here it come...

new project.

aspera nek2134GK 3/8hp comp.
vapochill condenser
1/4" discharge 3/8" suction with DN10 flexhose 50cm
2,7m 0,031" captube
papst220v 180cfm fan, will proberbly be replaced by more silent 12v fan.

some pictures...

http://goto.glocalnet.net/timedlund/asperass/DSCN0170.jpg
my brittish shorthair is crazy about boxes and this box is filled with, expect for the cat an evap for this build... ofcourse, it's his house and he proberbly think it's his evap :p

http://goto.glocalnet.net/timedlund/asperass/DSCN0178.jpg
the system is running on a bench with to much on it!

http://goto.glocalnet.net/timedlund/asperass/DSCN0179.jpg
temp idle

http://goto.glocalnet.net/timedlund/asperass/DSCN0182.jpg
temp 160watt load

http://goto.glocalnet.net/timedlund/asperass/DSCN0181.jpg
system is running, no floatback due to the "uphill" to the suctionport on compressor..

http://goto.glocalnet.net/timedlund/asperass/DSCN0184.jpg
for comming project, a split 2x 3/8"+service valve to ½". area of 2x3/8" pipes is same as 1x½" so I think that will be perfect to joint two suctions together without loosing capacity due my rotarys have ½" suction.
I guess everyone know the service valve is ment for :)

tomorrow new bench session with more tuning on 160watt load.. I think that pretty much optimal load for this size of compressor.. it doesn't handle much more load with good temptures..I expect to reach -40 when finished.. and the I will recharge it when my bottle of R404a arrives.

dimensions of comming chase is 18x22x45cm (w*h*L)

this was for now...
Regards
tim

[krullet]

nice one,

love to see some more builds :D