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Big 2 stage cascade by piotres (2x 2+CV)

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piotres


Membre
Messages : 369

dimanche 25 septembre 2011 à 12:21:03     
Hello

I'm making currently 2 stager with monsterous big 230V 1PH rotaries 2 rotaries over 25K BTU (2+HP).

+4 pressure gauges, 2 controllers, bypass, 2x cut-off, big expansion tank, 2 plate HXes (one as SLHX on 2nd stage).

Case with 4mm thick steel baseplate (because each compressor is over 25kg ).

It'll be worklog .

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Today I plan to screw all parts to baseplate

Regards
Peter
Google




     
piotres


Membre
Messages : 369

mardi 27 septembre 2011 à 00:27:44     
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Sk_rmouche


Apprenti Aigri
Messages : 17069

jeudi 29 septembre 2011 à 14:14:47     
Looks great as usual, but what's the purpose of the little condensor ? Desuperheater of the second stage ?
piotres


Membre
Messages : 369

vendredi 30 septembre 2011 à 00:39:03     
Yes, it's desuperheater for 2nd stage .


Plate HXes brazed :

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piotres


Membre
Messages : 369

dimanche 09 octobre 2011 à 00:33:28     
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I must change compressor on 1st stage for brand new Toshiba approx 28000BTU - "old" one was light used compressor, newertheless is has a leak (yes, leak on compressor :-O - first time I've seen that) on top, near electric connections. After I finish that project I try to weld and reapair it, now it has gone to shelf in mine workshop.

so now 2 brand new and BIG rotaries in the cascade :yepp: .

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Old one unbrazed .

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New one mounted .

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Cascade is 100% brazed, during some next days I plan loadtests .
piotres


Membre
Messages : 369

vendredi 21 octobre 2011 à 00:39:58     
After some complications (bad oilseparator - mixed discharge and suction ;/) and removing SLHX (it hadn't performed well in this cascade), I have made it running fine .

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Today approx -100C@315W with "cloth" pipe insulation on one thermomether.

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and -103C same time on another one .

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On this color I plan to spray pipes this weekend .
Sk_rmouche


Apprenti Aigri
Messages : 17069

vendredi 21 octobre 2011 à 11:24:13     
quite impressive powerful cascade, what about the compressor and discharge temp, especially at second stage ?
piotres


Membre
Messages : 369

samedi 22 octobre 2011 à 01:04:50     
I test it in 11*C ambient, pressures were approx 11 bara on 1st stage and 12 bara on 2nd stage fully loaded. I haven't measured temperature of pipes and compressor- compressors were quite hot, like almost always rotaries are .
Sk_rmouche


Apprenti Aigri
Messages : 17069

samedi 22 octobre 2011 à 09:10:25     
Okay

11C ? And with hot summer temps, you're expecting the worse ?
piotres


Membre
Messages : 369

jeudi 27 octobre 2011 à 00:30:51     
Pipes painted, insulation done, most of electric work done :

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Regards
Peter
piotres


Membre
Messages : 369

lundi 28 novembre 2011 à 15:12:30     
Finished a long time ago, but I haven't got time to upload pictures :

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Unloaded temperatures . Carel controller on 1st stage shows around 8*C higher temperature than real, and that's end of it's probe tune area :shakes:.

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Loaded with 315W dummyload .

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Sound level loaded .

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Black cascade and mine black cat .

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Regards
Peter
Google




     
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