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Old 08-08-2014, 09:50 AM   #71
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I'll be adding this myself - silver is by far the most effective heat transfer element used in this stuff.

Amazon.com: Arctic Silver 5 Thermal Compound Large Size - 12 Gram Tube: Computers & Accessories
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Old 08-08-2014, 10:00 AM   #72
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So you will be removing the original paste?
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Old 08-08-2014, 10:13 AM   #73
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So you will be removing the original paste?
I probably will, can't be positive until I get my 21 to play with. It appears to be an oil-based compound as it's really gooey looking, so it could be removed with a plastic putty knife and saved to reapply.

Looks like Dometic only put it along the cooling tube path, I'm curious if the external fins are unevenly warmed only along the tube path. Can't really tell from the pics how thick the attachment blocks are but there appears to be a standoff space between internal and external fin blocks, which makes no sense for heat transfer. Thermally conductive pads are available to fill in the gap if desired - good project for when I get my 21!
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Old 08-08-2014, 11:53 AM   #74
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There is a LOT of "goo" for something sold in 14gm containers. I would say something like 8 oz on just the lower set of fins.
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Old 08-08-2014, 11:57 AM   #75
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Dometic only applies the paste to the tubes because that's the only source of cooling. In between the tubes is rigid foam insulation. I looked carefully at the fin construction and doubt seriously that much can be improved. On the backside of the fin assembly is a continuous sheet of aluminum to "spread the cold" across to all the fins attached to the front side. You might do better with some other paste, but again, I think we're probably already transferring all the heat that's going to transfer.
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Old 08-08-2014, 12:36 PM   #76
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I don't know if these comments belong in this thread or the one about New 4.3 & 6.7 Fridge Info, but here goes. I think we're dabbling in the margins with fans, magic grease, and baffles. After watching lots of things tried, both on the forum and the efforts of a very dedicated friend off the forum, I don't look for a lot more performance improvement with these fridges. Here's why: the boiling/evaporation and condensation points of the ammonia coolant are set by the amount of coolant and the hydrogen pressure loaded during manufacture. We can't change that. I strongly suspect that there is a backside temperature threshold beyond which cooling essentially stops because condensation no longer occurs. I'm using the term condensation loosely here because it's really a fairly complex chemical process. Regardless, about all we can do is delay reaching that threshold by trying to keep the backside cool with insulation and fans so that we don't hit this point sooner than necessary. Heating by the sun and the propane exhaust can get us to this threshold prematurely, so anything we can do to keep the backside cool will probably help. I'd like to always park under a shade tree, but that doesn't help while towing, so I'm going to work on insulation and freezing a large blue ice container overnight to move to the fridge section during the day. And we'll keep packing the cooler. I continue to trust Reace for the best long term solution we're likely to get, but I personally see this as a first world problem that will not diminish our enjoyment of camping in the Escape.
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Old 08-08-2014, 12:44 PM   #77
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So, how many of these refrigerators that used to be covered by warranty, are now not covered because they've been messed with?
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Old 08-08-2014, 12:49 PM   #78
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I don't think most of us have done anything permanent that can't be restored easily to the original configuration before going in for service. It's pretty easy for me to pull the Fridge Fix fan and wires. Most everything else (external fans and baffles) is done to the camper rather then the fridge.
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Old 08-08-2014, 01:15 PM   #79
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Quote:
Originally Posted by Parker View Post
Dometic only applies the paste to the tubes because that's the only source of cooling. In between the tubes is rigid foam insulation. I looked carefully at the fin construction and doubt seriously that much can be improved. On the backside of the fin assembly is a continuous sheet of aluminum to "spread the cold" across to all the fins attached to the front side. You might do better with some other paste, but again, I think we're probably already transferring all the heat that's going to transfer.
I was wondering what the stuff in between the fins was. I figure there's nothing to lose with a silver paste and completely filling in the void currently around the route of the Dometic paste application. Reace & Dometic working together is our best hope at an "approved" solution, but this is like another mod in my book - any tweak that turns out to be helpful is good!
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Old 08-08-2014, 01:21 PM   #80
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"I think we're dabbling in the margins with fans, magic grease, and baffles....etc...

Good stuff, Parker, very good stuff. Now I know better than to get my hopes up too high (not that there's anything wrong with that). Also agree ...do nothing you can't easily reverse.
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