thanks very much, you`re welcome in the competition :) and yours daughter too ;) Congrats :woot:Quote:
Originally Posted by Ssilencer
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thanks very much, you`re welcome in the competition :) and yours daughter too ;) Congrats :woot:Quote:
Originally Posted by Ssilencer
Awesome! Congrats on the daughter as well. :)Quote:
Originally Posted by Ssilencer
Can someone give me a part number for an high pressure cutoff switch? Danfoss ones, for example...
Castel 3060/23C250
Refco EZ-75
.... here you go! ;)
RUNMC is stocking high pressure cutoffs on www.under-the-ice.com
Mine's a 1hp, 6-stager :woot: ! Too bad I have absolutely no idea how this thing was built and how it actually works (and neither does chilly1 :p: )Quote:
Originally Posted by Redwolf
http://img223.imageshack.us/img223/4879/877xb.jpg
danfoss KP7 <- these are adjustableQuote:
Originally Posted by Ratax
This are safety valves and no high pressure cutoff switchQuote:
Originally Posted by 404Power
Sry .... only read til the word pressure! :D
switches ... so ... no valves! :D
SRY!
So tempted to join in with this but think I'll stick to my cascade first. Got 2 rotaries sitting here asking to be used :(
Boardy
OK? So phase sep need to be home made? Wanted to use spare oil sep I had for it...?
Oh... I would like to join in :)
Compressor not decided, gas... probably mix of following...
R402a, R404a, R507, R116, R23, R508...
(not sure which one quite yet...... there is the fun part I guess)
I like to join too... Compressor 1/2HP or more, gases R402a/R1150...
tnx
you'll have problems using a gas that's blended (like the 400 series) in an auto-c. your phase seperator is going to break apart the gasses.Quote:
Originally Posted by jinu117
Please all who didn`t show us ice batch shot to do it in next few days, please.
LittleDevil, jinu117 you`re in.
402 will seperate, can not be used;)Quote:
Originally Posted by LittleDevil
are you sure? :rolleyes:Quote:
Originally Posted by LittleDevil
The use of 4xx series gasses is NOT something that can't be used, it just means a lot more thought has to go into it's use.
The gasses will tend to separate more easily than the 5xx gasses, but if you use more than 2 stages and buffer the first stage with something that condenses at the higher temps/lower pressures then there's no reason you can't.
Also if the 'glide' in a 4xx gas is quite low it's chances of separating in way that's going to drastically affect the operation is reduced as well.
I'm looking forward to seeing how those that are using the 4xx gasses end up myself. It's been done in some successful Autocascading before, by Mr. Chilly1, so it's not like it WON'T work, I just think that the tuning process may be more difficult in using them.
Cheers
Gray
Here is mine.
the polycold system has many stages so you have to worry about it less, every refrigerant will find it's own space in the system.
something like r404a isn't really a problem to use because the amount of r134a is so small in it, but with r402a you have a large glide and the mix contains large amounts of r125 and large amounts of r22. when the r22 condenses and cools down the HX there is absolutly no reason for the r125 to condens in the condensor so the r125 will condens in the HX where the high pressure refrigerant should condens. When you only have a 2 stage, this is a big problem offcourse.
and you can't expect to get the performance from r402a in an autocascade that you can expect from r402a in a single stage.
A 1/2 hp compressor with r402a and ethylene is just asking for very very high discharge pressures.
but I don't care anymore, it's just some advice to make it easier and rule out some factors if something goes wrong. if people don't want to read it fine, I'll shut my mouth about it ;) everbody just do what you like.
Well it's very good advice, Unknown. Really unless you want to get complicated, or make it more difficult to work with, then using pure gassed that you know are going to do what you 'hope' they'll do is always going to be the easiest method for sure.
I'm still torn on using a blend and a third stage myself, but really that's only gonna happen if the mods I'm doing for ppl slows down, otherwise keeping it simple is what I'll be doing, as it will save a lot of tuning time.
So really, your reminders are only going to help people if they listen to you. Especially those that haven't tried an Auto before.
Gray
Actually, that was good advice unknown lol.
Only thing is... in my case, my opinion of how it should work is bit diff from rest of guys looking at it really... I DON'T want 100% separation due to capacity issues that happens or huge static pressure... :p
I want something reasonable that can get colder temp than single stage could that is useful :)
So what I was designing in first place had bit of the "blendid" 2nd stage to see if proper amount of refrigerant with good mixture of gas can get in :p
Yes, tuning isn't going to be fun as Gray mentioned but I got time it seems :P
One major candidate in my eye right now is R404a+R23. (practically same composition as ES-20). Obviously, it will partially separate in this situation which I think might just do the trick for what I want to achieve using not too big of compressor. But than... I got other gases to play with... 116 looks nice since it's discharge pressure is so low... who knows what will happen after all :p
well jinu I had a good lauch when you summed up the gasses you wanted to use. I don't mean this as a flame or anything, I just don't think you really thought about it.
A mix of r404a + r507, these gasses are almost the same r404a=507+4%r134a so mixing them doesn't do anything.
A mix of r508 + r23 +r116, r508=r23+r116!! so r508 is useless if you can mix r23+r116 yourself.
Lmao... I meant probably 2 out of the set I have in hand... lol :p Of course, that makes selection much more varied in my end.Quote:
Originally Posted by Unknown_road
I will repeat, R404a <> R507+R134a. The ratio of two other gases are too diff to consider it similar enough.
Quote:
Originally Posted by Unknown_road
:clap: :clap: :clap: Thats what I've been trying to tell these guys. Chemical engineers work for years in lab with the best test equiptment to find the mixes for the best performance.There are already over 50 gases avalible for use. You then know the P/T charts and atomic weights. I think the key to a good auto is the correct weights and miscability,or non-miscability. You may also consider the velocity in the seperator.;)
Dun forget how it enters the seperator.