View Full Version : coiled hx load direction (cascade)
part:10"coil 12 foot long hx 1/2" with 1/4 " inside
on the high side of the hx one end is suction return the other is cap tube feed
the 1/4 pipe running through the middle is the low side to be cooled
which end of the hx would you run the hot gas to be cooled first
the suction end of the hx or the cap feed end
thanks baz
n00b 0f l337
05-21-2006, 09:47 AM
I'd run them in the same direction.
hatemi
05-21-2006, 10:00 AM
SEcond stage in from top and out from the bottom. First stages captube feed from bottom and suction out from the top. That way youll have gravity to help you and the second stages liquid line exits at the coldest place in the hx.
I'd run them in the same direction.
so you would put the low side feed (hot gas) into the hx at the cap tube end
of the coil
SEcond stage in from top and out from the bottom. First stages captube feed from bottom and suction out from the top. That way youll have gravity to help you and the second stages liquid line exits at the coldest place in the hx.
so what i have done here is the correct way around?
http://net7.info/1/casscade/working/IMG_0002.jpg
Sneil
05-21-2006, 10:23 AM
get that insulated and watch your temps drop even further
get that insulated and watch your temps drop even further
its a bit of an on going build so inulation will have to wait till its done
but i get what your saying
hatemi
05-21-2006, 10:32 AM
Yup. Thats how I would have done it. Nice and small cascade BTW. Is that small condencer able to handle the load?
Yup. Thats how I would have done it. Nice and small cascade BTW. Is that small condencer able to handle the load?
no it failed to hold a fx57 @ the hx but there have been some changes since that pic
the hx has a sc21 now but there is still an NL11f on the low side and better sub cooling
http://net7.info/1/casscade/sc21/IMG_0001.jpg
n00b 0f l337
05-21-2006, 10:42 AM
What sorta HX you be running there?
Tube size?
hatemi
05-21-2006, 11:08 AM
You dont actually even need anything bigger than NL11F in hte second stage when the HX is rock solid. Very nice layout and plumbing in that cascade. What are you using as low satage refrigerant?
What sorta HX you be running there?
Tube size?
10"coil dia hx
12 foot long
1/2 dia with 1/4 dia inside
Sneil
05-21-2006, 11:32 AM
Post edited
what is your second stage gas?
Gray Mole
05-21-2006, 12:00 PM
Yeah that's looking good so far, and really I found that my 1/2HP and 1/3HP cascade did a great job with around 150w.
Only things I'd suggest...
Condensor, if you're using a small one you'll have to go with BIG fan power, so increasing that condensor size might just give you a little better consistency on the HX temps, and allow a little less noise from the fans.
Also, I'd suggest wrapping that captube for the HX around the HX return. Will give you better subcooling and act like a slhx for the return pipe.
Cheers
Gray
Post edited
what is your second stage gas?
You dont actually even need anything bigger than NL11F in hte second stage when the HX is rock solid. Very nice layout and plumbing in that cascade. What are you using as low satage refrigerant?
co2/402a
when i started this i would never of guessed that the hx was the secret
Yeah that's looking good so far, and really I found that my 1/2HP and 1/3HP cascade did a great job with around 150w.
Only things I'd suggest...
Condensor, if you're using a small one you'll have to go with BIG fan power, so increasing that condensor size might just give you a little better consistency on the HX temps, and allow a little less noise from the fans.
Also, I'd suggest wrapping that captube for the HX around the HX return. Will give you better subcooling and act like a slhx for the return pipe.
Cheers
Gray
thanks for all your help with this project gray:)
quintus
05-22-2006, 06:31 AM
the sightglass would't be beter turned 90degrees and before the valve? this way u see if u need to open the valve
regards,
q
the sightglass would't be beter turned 90degrees and before the valve? this way u see if u need to open the valve
regards,
q
i know when i built that part of the unit i was not thinking