Chiller/ac unit

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Originally posted by Gary Lloyd
Many A/C's have multi-speed (actually multi-HP) fan motors. Once you have trimmed the refrigerant charge, it may be possible to go to the lowest fan speed, thereby reducing the noise.

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Funny you should mention it. My fan is at the highest speed right now .when I rewired everything I omited the the fan speed control leaving the extra wires intact but caped off . I think I'm getting sick of the sound as it seems to get louder every day.LOL. I've been reading the manual for the 608 test type 1 , Very dry reading :slobber: It puts me to sleep about every other paragraph. Still I trudge onward ,Igotta .:D

I know exactly what you mean. If I ever start writing like that, somebody please shoot me... lol

BTW, airflow requirements diminish as the coolant temperature drops. You need full airflow while it is pulling down to temperature, but once it is down there, you could probably switch to low speed and still maintain delta-T @ 10C or less.

On the other hand, you may find there is little difference between high and low speed, since the evaporator fan has been removed. The speed of a multi-HP motor is heavily dependent upon load. With no load at all (fan blades removed), all settings have the same speed.

Eventually, you will probably want to replace it with a nice quiet muffin fan or two.

Right now you need about 225-250 CFM for pulldown, but with the proper cap tube, trimmed charge, and good insulation, this could be cut nearly in half.

Another possible strategy would be to use two fans, and turn one off when the coolant is down to temperature. We could automate this using the temperature control that came with the A/C.

As the coolant temperature comes down, the liquid line temperature will also drop. We could strap the temperature sensor to the liquid line, insulate it, and have it turn one of the fans off and on as needed.

so could i get a 5200 BTU AC and get a baker evap block 4 my video card, then get an AC shop to change the evap to the baker block for me? There are plenty of refridgeration places near here.

Yep. In addition to the block, you will need a cap tube that is matched to the load using R22, so we need to know the load. You will also need the flexible suction line.

Thinking Bowman and Baker need to add such things to the kit. It would be very handy to be able to purchase an assembled block, captube, and suction hose. The assembly could simply be hooked up to a condensing unit, evacuated, and charged.

My thoughts exactly.... as I assembled one this afternoon. I thought that these should be offered as they are the most difficault part to assemble correctly.

Bowman has announced that this is in the works. :D

You can't imagine how tempted I am to come out of retirement. If I could afford it, I would now be building an auto-cascade prommie mod... LOL

DO IT GARY!

Got a prommie and a blank check?

Great post !!

Jamal , can you post back some temps when you get that GPU in the loop.

Whenever you guys are ready, I have been doing some research and have found a couple kickass refrigerants that can put your system up into the R502 range, making them competitive with R404A and R507 systems:

http://www.xtremesystems.org/forums/...threadid=26839

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Originally posted by ehorn
Great post !!

Jamal , can you post back some temps when you get that GPU in the loop.

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I sure will. Hey! welcome to the sickness!:D I was kinda wanting to do a vmod on my 5900 before i chilled it but i've been a little chicken.:eek: was thinking if i could find a block I might do it in the morning > You might just have been the motivation I need to get offf my @ss an do it

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so could i get a 5200 BTU AC and get a baker evap block 4 my video card, then get an AC shop to change the evap to the baker block for me? There are plenty of refridgeration places near here.

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Let me know when you are ready. Maybe you can tempt me. :D

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Originally posted by Gary Lloyd
Whenever you guys are ready, I have been doing some research and have found a couple kickass refrigerants that can put your system up into the R502 range, making them competitive with R404A and R507 systems:

http://www.xtremesystems.org/forums/...threadid=26839

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Wow! very cool , just read yur post , gotta take that 608 test I read the manual got to read it again with a highlighter pen it was so poorly layed out I couldn't retain enough of it.I would still want to tune my system up first and learn in steps. awsome goal to shoot for though.So yea, price and availability of these fine refrigerents???hmmmm?

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Originally posted by jamaljaco
So yea, price and availability of these fine refrigerents???hmmmm?

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From what I've seen R404A, R507, R402A, and R408A all seem to be about the same in cost, not sure about availablity but you can order them online from www.r22.org. Of course they added R507, and R410A after I ordered a bottle of R404A. :(

how much colder is r502 than r404 or r507?

R402A at 1 atm boils at –56.5°F (–49.2°C).
R404A at 1 atm boils at –51.6°F (–46.5°C).
R408A at 1 atm boils at –46.3°F (–43.5°C).
R507 at 1 atm boils at –52.1°F (–46.7°C).

Of course boiling point isn't everything so here is some additional info on them.

All of these refrigerants are designed as R502 substitutes, therefore all of the evaporating temperatures are within a few degrees of each other. That said, with all else being equal, the coldest would be R402A, then R507, then R404A, then R502, then R408A.

They are all close enough to make this a difficult decision. We need to consider the other factors, such as high side pressures and oil compatibility.

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I You might just have been the motivation I need to get offf my @ss an do it

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Great!! You've done a fine job with the system and the postings/pics... Most appreciated.

I have been looking for a cost-effective, cooling system and I think I have found it in this thread. Flexible, multi-component cooling.. with some very respectable temps...

at a fraction of prommy pricing.;)

It has been a great read thus far.. I was sorry to see Pimpsho snap the vapo line. Though i am hopeful he and mrnuke will have their systems up and running in no time.

Here's another good source for refrigerant information:

http://www.refrigerants.com/frame.htm

Move your cursor to "Products", click on "Refrigerants".

Interesting info Gary and Gleep. Gary, with regards to R408A/R402A what are your thoughts... R408A sounds like a winner. Would R402A be dependent on the quality of the compressor??

We need to consider the strength of the compressor and the skill level of the person doing the job.

With a compressor designed for R12 or R134A, using any of these refrigerants puts high side stress on the compressor valves, yet many have successfully used R404A and R507 with these compressors. Then again, we may not be hearing from those who destroyed their compressors.

R408A would be the least stressful and R402A the most stressful. None of these refrigerants would be a problem for an R22 or R404A compressor.

Then there is the skill level. Removing a compressor, replacing some oil, and re-installing the compressor may sound easy. It is not. R408A does not require it. R402 does. And on some compressors it is possible to replace oil without removing the compressor.

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Then there is the skill...

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Well said... As I would not be in this post without the following direction...

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What I consider to be the best first project for a phase change noob. Transform a window A/C into a chiller, then add a piercing valve and start learning (by reading and doing) about refrigeration.

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Of course there are a few other things that go into selecting a refrigerant such as Glide this is the temperature diffrance between the bubble point and dew point, If the system is engineered to take advantage of this it can become more effecient. Another is the whole reason for section 608 of the clean air act. And this is the phase out first of the refrigerandt that destroy the ozone and then the evential phase out of global warming gases such as r22, All of these gasses are no longer available in Europe. R22 blends such as 402,408 ect aren't sold and are illegal to install in equipment. In the us this phase out of r22 blends is on a accellerated schedule. This means that we will see starting this year a floor tax and an accelerating federal tax. soall blends based on their proportion of global warming/ozone destroying gasses will recieve this tax. R12 is now over1200 for thirty ounds R 22 blends (hotshot,408,402) will be over 220 per 0 pound cylinder this year while r507 and 404 will only rise as a normal function of the markets..

Ahhhhh... the heavy hand of government strikes again.

This is good to know, chilly. So eventually, the only alternative will be POE oil.