First build single stage (many images)
let's start with a bit of pre history , i got my first Vapochill ls (from ebay ) back in 2005 year or so , it was badly broken after shipping , i took it to repair shop , they fixed a broken pipe and recharged with R404 . After getting home the unit worked but temp were poor and compressor would shut down randomly . then completely refused to start , took it back to repair , they said that the control unit was bad , i ordered a new one , after about a month i got it plugged to the system , and again same issue as before compressor shut down randomly and heating up a lot . i took it back to repair , this time they refused to accept it for repair . since i was a student at the time , i was almost out of cash trying to repair the unit , so i forgot about .
Now 15 y later i found the unit in my garage :D , so i said what the hell why not to fix it , i spent about 2 week in forums reading about how all this work , went ahead bought all necessary tool and started the repair .
I figured out that the unit still had a leak on it , this caused the compressor to overheat . This little bad boy was danfoss nf5.5clx i was able to start the unit and get it working normally but this S*** was very noisy . so i decided to swap it with a NL11F ( Thanks to Charles Wirth for double checking with me the model) .
https://i.ibb.co/QrYKF9f/20200201-174456.jpg
The compressor was used it cost about 25$
since i am planing to get load in the 200-300w range , i updated the condenser
https://i.ibb.co/JnjpkV9/20200201-174519.jpg
about 20$ , according to spec 15c delta T @ 700w
i noticed that the old accumulator has some debris inside that wan't be removed , so i decided to make a new one using an old filter drier .
https://i.ibb.co/C9sjcr2/20200201-203249.jpg
https://i.ibb.co/hRhdZ6X/20200201-203257.jpg
Also installed 2 king valve to later adjust capillary tube length easily (Thanks to aenigma for idea)
https://i.ibb.co/PmtR4NY/20200201-174526.jpg
Used remaining copper tube to make a small coil on the compressor outlet . Was really hard doing this by hand , require some huge grip strength :D .
https://i.ibb.co/fQSXXJ2/20200201-224429.jpg
finally my new SS tube arrived
https://i.ibb.co/Bs5HgQj/20200202-175850.jpg
https://i.ibb.co/dWqFb6s/20200202-185851.jpg
Silver brazing to cooper
Now putting everything inside the small case
https://i.ibb.co/R7xhQHb/20200201-224434.jpg
https://i.ibb.co/NtDf0k3/20200201-232858.jpg
https://i.ibb.co/v4Rtc50/20200202-004049.jpg
Now finally i am allowed inside the house (wife allowed :D) to do remaining work . It was really cold out in the garage there was no heating :down:.
capilary tube install and deep vaccum , i used 3.2m of 1 mm .(so far maybe will tweak later .)
https://i.ibb.co/rb0t98n/20200204-194322.jpg
https://i.ibb.co/pLYBt1z/20200205-014122.jpg
https://i.ibb.co/LkfTQZv/20200203-124033.jpg
https://i.ibb.co/FJPR1zg/20200204-194151.jpg
i also used a hair dryer over the compressor and tubing to boil any remaining moisture when pulling vacuum .
system did hold the vacuum for 24h now we can start charging the R507 .
https://i.ibb.co/sKYry3v/20200206-144714.jpg
first frost :up:
insulation ,
https://i.ibb.co/KypWht0/20200206-154026.jpg
https://i.ibb.co/JQdD91v/20200206-154040.jpg
charging until 6c super heat .
https://i.ibb.co/XXbw4nc/20200206-173430.jpg
and finally :
https://i.ibb.co/mHMj2b4/20200206-173418.jpg
https://i.ibb.co/2g2Z76G/20200206-173433.jpg
now finishing insulation :
https://i.ibb.co/tm6Yk33/20200206-185704.jpg
https://i.ibb.co/qWHhcvw/20200206-185709.jpg
testing with p4 945 @ 5.2 ghz 1.6v , according to asus monitoring it is 220w (according to estimation from power meter 260w , and finally according to OuterVision? Power Supply Calculator 254w ) . i have a D820 i will test it later since it should be hotter .
https://i.ibb.co/VCtdpvQ/20200206-235658.jpg
https://i.ibb.co/JkD44sC/20200206-235750.jpg
https://i.ibb.co/Gs4k0FH/20200207-000700.jpg
342w is the compressor power usage
https://i.ibb.co/47hrm6T/20200207-000709.jpg
high side pressure under load
https://i.ibb.co/9nq1G9M/20200207-000719.jpg
lowside pressure under load
All those under load (200-250w):
decharge temp : 61c
condensing temp : 36c
HP : 260 psi
ambient temp : 26c
low side pressure : 0.7bar
evaporator temp : -28c
temp 6" from compressor : -14c
compressor temp : 40c (delta fan doing great job :D)
It was really fun time building the unit , some time it was a pain when i had some micro leak and then cap tube blockage , but with patience and learning everything's is possible .