t800's daily, cased, small cascade | WORKLOG

Hi

Some mounths ago t800 from XS.org forum, ask me about unit to use it daily. First we had thought about single-stage, we fast we have decided that performance won't be as good as t800 want and with big rotary compressor it'll be bit noisy ...so we decided to built small cascade, in metal case, using 2* 1/2 HP compressors . Goal is -60-70*C@200W .

Specs :

compressors: ASPERA NE2134GK 12ccm 1/2HP x2
evap: steeper evap 40 mm tall
XV: captube 0.8 mm/ captube 0.8 mm
HX: plate HX , 12 plates
condenser: 1.9kW + 230mm fan + 5W motor
refrigerants : R507/R23
oilseparator : HENRY S-5181
safety : RANCO cut-off with manual reset
case : metal case, 55 x 37 x 36 cm, silver paint
others: SLHX on 1st stage, small LCD HX's out temperature display, bitums sound insulation inside case, two 120 mm fans on the back of case + sunbeam CCFL red grills on them











On that photos case in only with layer of premier, no that's not silver finish .

Later I've changed pipes configuration a bit, finally oilsep is before desuperheater
.








I plan to make electric wirings during some next days (maybe even today ?) .

I'm waiting for evap too .

Best Regards
Peter

great, I don't get the point in using a cascade cooled rig as a daily computer, but if he wants that, that's rather nice

not too bad

j/k, marvellous job, finitions are very clean

is that a float oilsep ?

Thanks guys, tomorrow new pictures with electic done .

Yes separator has float, it don't need any more valve .

Regards
Peter

Hi

New pictures - wiring :



During work .





Best Regards
Peter

very nice
what is the little white box on the top?

i think that is a "pressostat" (<---- french name)

it is a security device which stops the motor when the pressure is too high.

edit : i forgot to congratulate Piotres for his excellent job

Yes, that's cut-off / french : pressostat / polish : presostat .

amazing coincidence

by the way, Piotres, why do you install a black plastic mesh on the base ?

That're bitumen sheets .

That's same material as it's used in profesional car audio instalations for make cars sound-proof . And that's same cause I've used them - just to make whole unit more silent .

Whole case from inside will be insulated by those bitumen mats .

Peter

Hello





Some fitting of case .... I must put some alu mesh inside holes for gauge, becasue first that had been planned 1.5 kW condensor,that 1.9 kW is just little too high and there aren't enought space for gauge .



And bitumen insulation inside it .

Today I brazed evaporator for this unit . Bad is I have some exams in school this week, because there isn't much to make to finish it .

Best Regards
Peter

Just for information , how Old are you Peter ?

Great Job , like always

not seem to be hand made not enough uggly , more and more .....

I'm 20 ..I'm so old I know .

No case is made by company .

New pics :



Suction line (braided one) is very short becasue cascade will be used in that way :





Improved wiring ...some sleeve to protect insulation on wires .

I plan small surprise at back wall of case ...You'll see it in some next days .

Regards
Peter

Insulated suction line .

Hi

Some new work :



Mine wonder Girlfriend hase been helping me with unit .



Result of her work .





Completely brazed unit .



2nd stage evacuation .

Regards
Peter

Hello

Insulation is done :





This weekend I plan to put R23 inside and do some tests .

Best Regards
Peter

Hi



That's temperature of evap with R410a on 2nd stage. Loaded with 225W . 1st stage loaded has been around -35*C .

Anyway, I had expected bith lower with R410a, I guess making sth like R507/R410a cascade is nonsense, becasue ordinary SS with compressor like used in that cascade can make around -35*C@225W with R507 .

To be sincere I'm after tests with R23, I had got problem with oilseparator and must change it, but that's longer story which I'm going to write about in some next days . Now all is OK again, and cascade is working very fine with R507/R23 .

Regards
Peter

That's nonsense as the floodback is tiny because of the low discharge pressure on the second stage.

Hi

Few changes ...





I must chaged Henry oilsep becasue it had been damaged - all the time is has been pouring some of gas directly to oilback line, so to compressor's suction port ..as a result I got +1 bara on gauge, very slow pull-down and no way to hold any load . So I've changed it for another Henry S-5181 which I got, that one works ok. I've mount this time it in bit another way - some 2 mm captube as a oilback + castel sightglass .

Maybe anybody know a way in which I can fix float in old Henry S-5181 ? If I'll use handvalve on oilback line will it be working ok ?





Unloaded evaporator temperature with R23 (BTW. UEI is mine new, next thermometer ) . -35.4*C is end on plate HX temperature (outlet pipe, 1st stage) .



And here loaded with 225W dummyload .

Cascade is near ready to go, only I'll hold it in mine house for one (some) more week/s to check if it's sure leak free .

PS. Ohh You can see part of surprise on that photos ..nah, but I'll show You that on full picture bit later .

Best Regards
Peter

Hello

Finally finished :







Finally I've forgot about make photo of surprise LOL :ROTF: :ROTF: - that "star" fans on 120mm blower fans are CCFL shine red . Hope t800 will make photo in night, after He'll receive that baby .





That small thermometer on front panel show 5*C too high temperature ...and it can't be tunned ...gah .



Finally unloaded .

Regards
Peter