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Old 06-28-15, 11:10 AM   #21
MEMPHIS91
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Its been a few days of real headache work but I finally have some results to show.
I played with the system til I found out the tubing on my evap was to large. So I split it.


And this worked better than any build so far. But I was pulling 2.3 amps just from the compressor. Even after blending R290 (that I now fill using a 20lbs bottle) and R152A (Duster Air, AMAZING STUFF).



So as normal I was not satisfied, I totally redesigned the system, eve fact I started over with new parts. I cut a condenser from a window unit in half on the table saw. And just made a evap out of bent 1/4 tubing. My idea is that fins are not really needed because I just want to make ice on them. I placed them on the condenser in hopes to gain some melting power from the heat. Also down sized my fan.




I put my blend in (15% R290, 85% R152A) and here are the results. 25 psi suction, 125 psi discharge, 85F suction, 115 F discharge, 1.6 amps. With tons of ice!! I think my cap tube could be a little longer to get the power draw down and the discharge temp up but I'm going to finish the system first and give it a test run soon.

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Old 06-29-15, 12:08 PM   #22
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IT LIVES!

Wow, what a surprise.

Here is a comparison of these 3 related gases:

http://www.autoacsystems.com/fasttra...ts_charts.html

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Old 06-29-15, 12:21 PM   #23
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Quote:
Originally Posted by MEMPHIS91 View Post
Its been a few days of real headache work but I finally have some results to show...
Fantastic! I think that we have created a monster!!!

I'm really curious about the blend you are using, and why are you using it? Also, where are you getting the R152A, and how are you handling the issue of injecting it into your system... how are you determining the mix, etc.

Very interesting work you are doing here.

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Old 06-29-15, 06:55 PM   #24
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Jeff, Awesome link, in all my digging I did not find that one.

AC, fourth picture down shows how I got my R152A. I got a cheap $7 can clamp off ebay and 4 cans of air duster for $12.
The idea behind this blend was to create a blend that works well with mineral oil. The compressor was matched for 134A , 152A was not as expensive, and all around cooler to use. It was luck that 290 just so happened to matched so well with it. After a few hours of research I found that a lot of the car 134A has a little bit of R290 and R600 in it. So I just guessed on the ratio. Sadly I don't own a good set of scales so I did it by pressure. I knew my target high and low psi, so I filled 290 first and finished off with 152A. A lot of the info I got was off of computer forums talking about their chillers. Some of their systems are this small and they experiment with different blends.

Got the fan mounted and wired, going to start on the box tonight.
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Old 06-30-15, 11:43 AM   #25
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... A lot of the info I got was off of computer forums talking about their chillers. Some of their systems are this small and they experiment with different blends...
Have links to those forums??

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Old 06-30-15, 05:46 PM   #26
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It's the extreme overclockers that do the little phase change systems. They primarily cool the main processor with an evaporator block, insulated from open air. Some of the guys do both the processor and the video chip. There are a few sharp guys on there doing cascade systems that run super cold.

http://www.xtremesystems.org/forums/...Change-Cooling

A discussion about a few cascade systems running various blends, and how what gas in the blend affects the parameters of operation:
http://www.xtremesystems.org/forums/...hlight=cascade

These guys sell phase change coolers for around 2 grand:
http://www.frozencpu.com/cat/l1/g49/Phase_Change.html

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Old 06-30-15, 06:38 PM   #27
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Yep that is the main site, I also found a lot on An Introduction To Extreme Cooling - Overclockers

There is thousands and thousands of hours of reading on those sites.

Longer cap tube got me to 10 psi suction @ 80F, 150 psi discharge @ 123F pulling 1.49 Amps. Time to box this thing up and see how it dehydrates.
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Old 07-01-15, 11:00 AM   #28
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Could someone explain how air should flow through the chamber for maximum dehydration? What position in the airstream would the evaporator do the most good? Should the chamber be sealed tight or have some exchange with ambient?

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Old 07-01-15, 05:57 PM   #29
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Could someone explain how air should flow through the chamber for maximum dehydration? What position in the airstream would the evaporator do the most good? Should the chamber be seed tight or have some exchange with ambient?

This is what I was thinking. Completely closed off system other than what happens to come in to drip tube drain.



I picked this up today. Was told everything works they just went with a bigger system. No idea the plans for something this big yet.

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Old 07-03-15, 01:20 AM   #30
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Oh no, could that thing be a host for a legendary Copeland scroll compressor? We are all doomed!

I once built a big dehydrator out of an old dishwasher. It used the existing heating element and klixon thermostat. I rigged the drying vent to stay open, and natural convection did the airflow. It worked pretty well, but used a whole lot of energy.

I believe you will need some air exchange for faster drying time. Sure, the evaporator will catch some moisture, but I believe by running intake air by the evaporator while it is still cool will do a good job of lowering the rh inside the box. Exhausting moisture laden warm air is how retail units do their jobs.

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