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Post by coldspaces on Aug 16, 2013 12:21:28 GMT
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Post by cablehack on Aug 19, 2013 5:03:02 GMT
An interesting read. Always wondered how one could determine charge by pressure and not frost line (like in a modern fridge where you can't see the evaporator) - now I know. The patent on the capillary tube is no doubt why GE used float valves for so long, and was experimenting with completely different looking high side restrictors.
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Post by allan on Mar 4, 2014 23:35:17 GMT
Can anyone help me find a previous discussion about SO2 and driers? I seem to remember some discussion about it and it seems like someone with a chemical background provided some input. I am getting ready to use some and was wondering if passing it through a solid block acid type suction drier as I discharge it as a liquid from the drum would be beneficial. I was also wondering if there was any moisture content in the liquid wouldn't it already be producing acid? Or does it need oxygen and or heat to make acid?
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Post by coldspaces on Mar 4, 2014 23:52:43 GMT
So far I haven't seen anything sure about what to use as a drier for so2. I emailed Parker or one of them last year and they wouldn't go out on the limb at all. Just said they had not been tested for use with so2.
Coldspaces
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Post by birkie on Mar 5, 2014 1:36:19 GMT
Can anyone help me find a previous discussion about SO2 and driers? I seem to remember some discussion about it and it seems like someone with a chemical background provided some input. I am getting ready to use some and was wondering if passing it through a solid block acid type suction drier as I discharge it as a liquid from the drum would be beneficial. I was also wondering if there was any moisture content in the liquid wouldn't it already be producing acid? Or does it need oxygen and or heat to make acid? Is this the thread? monitortop.freeforums.net/thread/88/so2-filterIt needs oxygen to form sulfuric acid. Water alone is sufficient to form sulfurous acid. Wouldn't using a drier with SO2 just concentrate the water so that it can react at the site of the drier pellets to form acid?
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Post by coldspaces on Mar 5, 2014 1:50:42 GMT
Wouldn't using a drier with SO2 just concentrate the water so that it can react at the site of the drier pellets to form acid? Sounds logical but if that was so it could do the same thing with newer refrigerants. So I would think that no it wouldn't just concentrate it. Not sure though, I am no chemist. Coldspaces
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Post by ChrisJ on Mar 5, 2014 2:14:45 GMT
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Post by birkie on Mar 5, 2014 2:33:18 GMT
Huh, I guess I assumed that SO2 would have been as easily adsorbed as water since it's relatively small, but it does look like a 3Å will exclude it.
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Post by ChrisJ on Mar 5, 2014 3:07:01 GMT
Huh, I guess I assumed that SO2 would have been as easily adsorbed as water since it's relatively small, but it does look like a 3Å will exclude it. I'm only assuming it wouldn't. Unfortunately I know very little about this so I could be completely wrong.
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Post by coldspaces on Mar 5, 2014 3:40:14 GMT
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Post by birkie on Mar 5, 2014 15:14:30 GMT
I'm only assuming it wouldn't. Unfortunately I know very little about this so I could be completely wrong. Your assumption was completely right - a medium with 3A pore size would selectively adsorb only water, keeping it safely away from the SO2 since SO2 is too large of a molecule interact with such a small pore size. I had assumed that both SO2 and H20 were small enough to be equally adsorbed (and cause a problem) - which was wrong for 3A media. Larger pore sizes might be a problem, but 3A looks on paper like it'd work well.
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Post by allan on Mar 5, 2014 23:49:25 GMT
So how would we use this info to select a drier? Or is that possible?
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Post by coldspaces on Mar 6, 2014 1:58:18 GMT
So how would we use this info to select a drier? Or is that possible? This means if we can find a drier with a 3A pore size it will trap and hold h2o but not so2. I have been trying to find such pecs on standard refrigeration driers but not having much luck yet. Most driers filter, dry and neutralize acid. The activated alumina is the part that neutralizes the acid. I have no idea if activated alumina is good or bad with so2. I do know that Carrier uses a special drier on their Puron systems. It only filter and dries the refrigerant. They knew when they first studied Pruon(R-410A that the activated alumina reacts with the combination or Puron and POE oil and can cause a gummy substance that could clog orifices. I will try to see if I can find out the poor size of the Carrier Puron driers. If they will privilege anyone with such info. Coldspaces
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Post by coldspaces on Mar 6, 2014 2:37:15 GMT
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Post by allan on Mar 6, 2014 12:02:42 GMT
Great research. I plan on just using the drier to filter the SO2 as I transfer it from the drum into the system. Want to make sure it is as dry as possible. Wonder if there is any reaction to the alumina?
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